JP2008002585A - Method of manufacturing rotation-linear motion converting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a rotation-linear motion converting mechanism capable of improving productivity. <P>SOLUTION: This method of manufacturing the rotation-linear motion converting mechanism 1 comprises steps as follows. The step of assembling a shaft assembly formed by combining a ring shaft body 21, a sun shaft body 31, and planetary shaft bodies 41 with one another. The step of assembling a gear assembly formed by combining a rear ring gear 23, a rear sun gear 33, and rear planetary gears 43 with one another. The step of measuring the degree of the inclination of each planetary shaft body 41 of the shaft assembly. The step of setting the relation of the shaft assembly to the gear assembly to a base relation according to the degree of the inclination of each planetary shaft body 41. The step of combining the shaft assembly with the gear assembly. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a rotational linear motion conversion mechanism that converts rotational motion into linear motion.

As a rotation linear motion conversion mechanism, for example, one described in Patent Document 1 is known.
This rotational linear motion conversion mechanism is configured by a combination of an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a plurality of planetary shafts disposed around the solar shaft. Has been. Further, the female screw of the annular shaft, the male screw of the sun shaft, and the male screw of the planetary shaft are engaged with each other. In the rotational linear motion conversion mechanism having such a structure, when the annular shaft is rotated, the solar shaft linearly moves by the planetary shaft moving around the solar axis through the force transmitted from the annular shaft. It becomes like this. That is, it is possible to convert the rotational motion of the annular shaft into the linear motion of the solar shaft.

In the rotational linear motion conversion mechanism, in addition to the meshing of the female screw and the male screw between the annular shaft and the planetary shaft, an inner gear (annular gear) of the annular shaft and an outer gear (planetary gear) of the planetary shaft When the ratio of the reference pitch circle diameter of the male screw and female screw deviates from the original value due to screw tolerances and changes over time, the relationship between the rotational speed of the annular shaft and the planetary shaft is The relationship in which an appropriate operation of the rotating linear motion conversion mechanism can be obtained is maintained.
International Publication WO 2004/094870 (see FIGS. 11 to 13)

By the way, the present inventor has a structure (structure 1) for transmitting force through a screw and a gear between the sun axis and the planetary axis in order to ensure proper operation of the rotational linear motion conversion mechanism. In addition, the adoption of a structure (structure 2) in which the formation of a screw on the planetary gear is omitted is being considered. That is, force transmission is performed between the annular shaft and the sun shaft and the planetary shaft through meshing between the annular gear and the external gear (sun gear) of the sun shaft and the planetary gear configured as a normal external gear. We are considering adopting a structure. However, when such a structure is simply applied to the rotational linear motion conversion mechanism of the above-mentioned patent document, any of the following methods (A) to (C) is used as a method of assembling each component in the production of the rotational linear motion conversion mechanism. Even if is adopted, each component cannot be combined.
(A): A ring axis is assembled to an assembly in which the sun axis and the planetary axis are combined.
(B): The sun axis is assembled to an assembly in which the ring axis and the planetary axis are combined.
(C): The planetary axis is assembled to an assembly in which the annular axis and the sun axis are combined.

Therefore, in order to solve the above problem, it is conceivable to apply the following structures (a) to (c) to the rotating linear motion conversion mechanism to which the structures 1 and 2 are applied.
(A): An annular shaft is constituted by a combination of an annular shaft main body having an internal thread and an annular gear.
(B): A sun shaft is constituted by a combination of a sun shaft main body having a male screw and a sun gear.
(C): A planetary shaft is constituted by a combination of a planetary shaft body having a male screw and a planetary gear.

When the above structures (a) to (c) are applied, for example, the components can be combined in the order of engaging the gears after engaging the screws of the shafts. The problem will be solved. On the other hand, in the manufacturing process of the rotational linear motion conversion mechanism to which the structures 1, 2 and (a) to (c) are applied, the relationship between the rotational phase of the annular gear and the rotational phase of the sun gear, and In consideration of the relationship between the rotational phase of the annular gear and sun gear and the rotational phase of each planetary gear, it is necessary to mesh the annular gear and sun gear with each planetary gear. Therefore, from the viewpoint of workability and work efficiency, it is desirable to assemble the rotating linear motion conversion mechanism including the following procedures (a) to (c).
(A): Assemble an assembly (shaft assembly) composed of a combination of an annular shaft body, a sun shaft body, and each planetary shaft body.
(B): Assemble an assembly (gear assembly) composed of a combination of an annular gear, a sun gear, and each planetary gear.
(C): Assemble an assembly (an assembly with gears) composed of a combination of a shaft assembly and a gear assembly.

  Here, the attitude of the planetary axis body in which the centerline of the planetary axis body is parallel to the centerline of the solar axis body is set as the body reference attitude, and the attitude of each planetary axis body in the axis assembly is the body reference attitude. The assembly state is the first assembly state, the assembly state when at least one of the planetary shaft bodies in the shaft assembly is tilted with respect to the main body reference posture is the inclined assembly state, and the ring is formed in the gear assembly. The assembly state in which the center line of the gear, the center line of the sun gear, and the center line of each planetary gear are parallel to each other is defined as a second assembly state. Further, regarding the relationship between the shaft assembly in the first assembled state and the gear assembly in the second assembled state, the center line of the sun shaft body and the center line of the sun gear are aligned and each planetary shaft body A relationship in which the center line of each planetary gear matches the center line of each planetary gear is defined as a predetermined relationship. That is, the predetermined relationship corresponds to a relationship in which the gear assembly in the second assembled state can be assembled to the coaxial assembly by moving the gear assembly in the first assembled state toward the shaft assembly in the first assembled state. .

  When combining the shaft assembly and the gear assembly, basically, the gear assembly is converted into the shaft assembly by translating the gear assembly toward the shaft assembly in a state where the above-described predetermined relationship is set. It can be assembled.

  However, in the actual assembly operation of the shaft assembly, the present invention is that the shaft assembly is assembled in the tilted assembly state by tilting the attitude of the planetary shaft main body with respect to the main body reference posture when each component is combined. Has been confirmed. When the shaft assembly is assembled in the inclined assembly state, even if the gear assembly in the second assembly state set in a predetermined relationship is moved toward the shaft assembly, the gear assembly is still in the shaft assembly. The assembly with gears cannot be assembled. That is, an assembly with gears cannot be assembled because the planetary gear is not assembled to the corresponding planetary shaft body. When such a situation occurs, the combination work of the shaft assembly and the gear assembly is temporarily interrupted, resulting in a decrease in productivity.

  By the way, in the rotational linear motion conversion mechanism, the number of threads of each component is set to a different value, so the internal thread of the annular shaft body and the male thread of the sun shaft body and the male thread of each planetary shaft body are meshed. Backlash is formed between these screws. Moreover, the magnitude | size of this backlash changes according to the setting aspect of the number of strips of each screw. Therefore, when a force is applied to the planetary shaft main body during assembly of the shaft assembly in the manufacturing process of the rotating linear motion conversion mechanism, the planetary shaft main body is tilted by moving the planetary shaft main body in the direction of backlash. The shaft assembly may be assembled in a state.

  The present invention has been made in view of such circumstances, and its purpose is that the annular shaft is configured by a combination of the annular shaft main body and the annular gear, and that the sun shaft main body and the sun gear Rotation that can improve the productivity of a rotational linear motion conversion mechanism that requires the combination of the sun axis to be configured and the planetary axis to be configured by the combination of the planetary shaft body and the planetary gear. An object of the present invention is to provide a method for manufacturing a linear motion conversion mechanism.

In the following, means for achieving the above object and its effects are described.
(1) The invention according to claim 1 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft. The annular shaft includes an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear, and the sun shaft is formed as an external thread. A planetary shaft main body having a planetary screw with a planetary shaft formed as a male screw and a planetary gear formed as an external gear. The annular gear is formed separately from the annular shaft main body, the sun gear is formed separately from the solar shaft main body, the planetary gear is Formed separately from the planetary shaft body The annular screw and the sun screw mesh with the planetary screw, the annular gear and the sun gear mesh with the planetary gear, and the rotational motion of one of the annular shaft and the sun shaft. In the manufacturing method of the rotational linear motion conversion mechanism configured to require that the other of the annular shaft and the sun shaft linearly moves through the planetary motion of the planetary shaft, the following steps, namely, “the annular shaft” "A first step of assembling the shaft assembly using an assembly constituted by a combination of a main body, the sun shaft body, and the planetary shaft body as a shaft assembly", "the annular gear, the sun gear, and the planetary gear" A second assembly step of assembling the gear assembly ”,“ about the attitude of the planetary shaft body, the center line of the planetary shaft body is Measuring the degree of inclination of the shaft assembly of the shaft assembly assembled in the first step with respect to the main body reference attitude, with the attitude parallel to the center line of the positive axis main body as a main body reference attitude; Step ”,“ Relationship between the shaft assembly and the gear assembly in which the shaft assembly assembled in the first step and the gear assembly assembled in the second step can be combined. The relationship between the shaft assembly and the gear assembly is changed by changing the state of the gear assembly with respect to the shaft assembly based on the degree of inclination measured in the third step. "4th step of changing to reference relationship", and "With the gear assembly after the fourth step, with the assembly constituted by the combination of the shaft assembly and the gear assembly as an assembly with gears" The gist is to manufacture the rotational linear motion conversion mechanism including the “fifth step of assembling the assembly”.

  In the above invention, since the relationship between the shaft assembly and the gear assembly is set as a reference relationship based on the degree of inclination of the planetary shaft main body, the planetary shaft main body of the shaft assembly is inclined with respect to the main body reference posture. Even in this case, the shaft assembly and the gear assembly can be accurately combined. As a result, the productivity of the rotary linear motion conversion mechanism can be improved.

  (2) The invention according to claim 2 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft. The annular shaft includes an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear, and the sun shaft is formed as an external thread. A planetary shaft main body having a planetary screw with a planetary shaft formed as a male screw and a planetary gear formed as an external gear. The annular gear is formed separately from the annular shaft main body, the sun gear is formed separately from the solar shaft main body, the planetary gear is Formed separately from the planetary shaft body The annular screw and the sun screw mesh with the planetary screw, the annular gear and the sun gear mesh with the planetary gear, and the rotational motion of one of the annular shaft and the sun shaft. In the manufacturing method of the rotational linear motion conversion mechanism configured to require that the other of the annular shaft and the sun shaft linearly moves through the planetary motion of the planetary shaft, the following steps, namely, “the annular shaft” "A first step of assembling the shaft assembly using an assembly constituted by a combination of a main body, the sun shaft body, and the planetary shaft body as a shaft assembly", "the annular gear, the sun gear, and the planetary gear" A second assembly step of assembling the gear assembly by using an assembly constituted by a combination thereof as a gear assembly "," the center line of the planetary shaft body is flat with respect to the center line of the sun shaft body. The third step of measuring the inclination degree of the planetary shaft main body of the shaft assembly assembled in the first step with respect to the main body reference posture with the posture of the planetary shaft main body as a main body reference posture, Regarding the assembled state of the annular shaft main body and the sun shaft main body and the planetary shaft main body in the shaft assembly, the assembled state when the posture of the planetary shaft main body is inclined with respect to the main body reference posture is inclined. The assembly state that can be combined with the shaft assembly in the inclined assembly state with respect to the assembly state of the annular gear and the sun gear and the planetary gear in the gear assembly As the attachment state, a fourth process for changing the assembly state of the gear assembly assembled in the second step to the specific assembly state based on the degree of inclination of the planetary shaft body measured in the third step. And “a fifth step of assembling the geared assembly after the fourth step, with the assembly formed by the combination of the shaft assembly and the gear assembly as a geared assembly”. The gist is to manufacture the rotary linear motion conversion mechanism.

  In the above invention, since the assembly state of the gear assembly is changed to the specific assembly state based on the degree of inclination of the planetary shaft body, in the case where the planetary shaft body of the shaft assembly is inclined with respect to the body reference posture In addition, the shaft assembly and the gear assembly can be appropriately combined. As a result, the productivity of the rotary linear motion conversion mechanism can be improved.

  (3) A third aspect of the present invention is the method of manufacturing a rotary linear motion conversion mechanism according to the second aspect, wherein the second step includes the annular gear, the sun gear, and the planet in the gear assembly. Regarding the assembled state with the gear, the assembly state in which the center line of the annular gear and the sun gear and the center line of the planetary gear are parallel to each other is defined as a gear reference assembly state. The fourth step is performed on the condition that the gear assembly is assembled, and the planetary shaft main body is in the main body reference position and the gear in the fourth step with respect to the relationship between the shaft assembly and the gear assembly. When the assembly state of the assembly is the gear reference assembly state, a relationship in which these assemblies can be combined is a first relationship, and the shaft assembly in the inclined assembly state and the specific assembly state Gear set The relationship between the shaft assembly assembled in the first step and the gear assembly assembled in the second step is set as the first relationship. And changing the assembly state of the gear assembly set to the first relationship to the specific assembly state based on the degree of inclination of the planetary shaft body measured in the third step, The gist of the invention is that it is performed on condition that the relationship between the shaft assembly and the gear assembly is set to the second relationship.

  (4) The invention according to claim 4 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft. The annular shaft includes an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear, and the sun shaft is formed as an external thread. A planetary shaft main body having a planetary screw with a planetary shaft formed as a male screw and a planetary gear formed as an external gear. The annular gear is formed separately from the annular shaft main body, the sun gear is formed separately from the solar shaft main body, the planetary gear is Formed separately from the planetary shaft body A portion provided on the planetary shaft body and capable of supporting the planetary gear is used as a gear support portion, and a space provided on the planetary gear and capable of inserting the gear support portion is used as a main body insertion portion. The planetary shaft is configured by fitting the support portion and the main body insertion portion, the annular screw and the sun screw mesh with the planetary screw, the annular gear and the sun gear, and the The planetary gear meshes with each other, and the other one of the annular shaft and the sun shaft moves linearly through the planetary motion of the planetary shaft accompanying the rotational motion of one of the annular shaft and the sun shaft. In the manufacturing method of the rotating linear motion conversion mechanism to be performed, the following steps, that is, “consisting of a combination of the annular shaft body, the sun shaft body, and the planetary shaft body. "A first step of assembling the shaft assembly with the assembly as a shaft assembly", "The assembly comprising a combination of the annular gear, the sun gear and the planetary gear as a gear assembly, 2nd step of assembling the body ”,“ assembling in the first step with the attitude of the planetary shaft body in which the centerline of the planetary shaft body is parallel to the centerline of the solar shaft body as the body reference posture The third step of measuring the degree of inclination of the shaft assembly with respect to the main body reference posture with respect to the planetary shaft main body ”,“ Regarding the relationship between the shaft assembly and the gear assembly, the sun shaft main body and the sun gear As a first relationship, the relationship between the shaft assembly assembled in the first step and the gear assembly assembled in the second step is set as the first relationship. No. 4 "The front end surface of the gear support portion of the planetary shaft body is a support portion end surface, the shape of the support portion end surface is a support portion end surface shape, and the end surface of the planetary gear facing the planetary shaft body is a gear end surface. The shape of the main body insertion portion on the gear end surface is an insertion portion end surface shape, and a virtual plane perpendicular to the center line of the sun shaft main body between the shaft assembly and the gear assembly is used as a reference plane. The figure obtained by projecting the support part end face shape with respect to the reference plane in the direction of the center line of the sun axis main body is a support part projection figure, and the insertion part end face shape is the sun axis with respect to the reference plane. A figure obtained by projecting in the direction of the center line of the main body is an insertion part projection figure, and the support part projection figure is located in the insertion part projection figure with respect to the relationship between the shaft assembly and the gear assembly. Second relationship As the relationship, the planetary gear obtained by measuring the assembly state of the annular gear, the sun gear, and the planetary gear in the gear assembly set in the first relationship in the fourth step in the third step. A fifth step of changing the relationship between the shaft assembly and the gear assembly to the second relationship by changing based on the degree of inclination of the shaft body, and "the shaft assembly and the gear assembly" To produce the rotational linear motion conversion mechanism including the sixth step of assembling the assembly with gears after the fifth step as an assembly with a combination of It is said.

  In the above invention, since the relationship between the shaft assembly and the gear assembly is set to the second relationship based on the inclination degree of the planetary shaft main body, when assembling the geared assembly, for example, the gear assembly is used as the shaft assembly. When it is moved toward, the gear support portion of the planetary shaft main body is inserted into the main body insertion portion of the planetary gear. When the gear assembly is further pushed toward the shaft assembly from this state, the attitude of at least one of the planetary shaft main body and the planetary gear is shifted from the center line of these components due to the contact between the gear support portion and the planetary gear. Since it changes in a direction to absorb (shift with respect to the state where the center lines are parallel to each other), insertion of the gear support portion into the main body insertion portion is allowed. As a result, the shaft assembly and the gear assembly are accurately combined, so that the productivity of the rotational linear motion conversion mechanism can be improved.

  (5) According to a fifth aspect of the present invention, in the manufacturing method of the rotational linear motion conversion mechanism according to the fourth aspect, the second step includes the annular gear, the sun gear, and the planet in the gear assembly. Regarding the assembled state with the gear, the assembly state in which the center line of the annular gear and the sun gear and the center line of the planetary gear are parallel to each other is defined as a gear reference assembly state. The fifth step is performed on condition that the gear assembly is assembled, and the rotation phase of the gear assembly with respect to the rotation phase of the shaft assembly is a gear rotation phase, and the circle in the gear assembly is The position of the planetary gear with respect to the ring gear and the sun gear is set as the inter-gear position, and the gear rotation phase and the inter-gear position of the gear assembly set in the first relationship in the fourth step are reduced. The other is changed based on the degree of inclination of the planetary shaft main body measured in the third step, thereby changing the relationship between the shaft assembly and the gear assembly to the second relationship. The gist is that it is done.

  (6) The invention according to claim 6 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft. The annular shaft includes an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear, and the sun shaft is formed as an external thread. A planetary shaft main body having a planetary screw with a planetary shaft formed as a male screw and a planetary gear formed as an external gear. The annular gear is formed separately from the annular shaft main body, the sun gear is formed separately from the solar shaft main body, the planetary gear is Formed separately from the planetary shaft body A portion provided on the planetary shaft body and capable of supporting the planetary gear is used as a gear support portion, and a space provided on the planetary gear and capable of inserting the gear support portion is used as a main body insertion portion. The planetary shaft is configured by fitting the support portion and the main body insertion portion, the annular screw and the sun screw mesh with the planetary screw, the annular gear and the sun gear, and the The planetary gear meshes with each other, and the other one of the annular shaft and the sun shaft moves linearly through the planetary motion of the planetary shaft accompanying the rotational motion of one of the annular shaft and the sun shaft. In the manufacturing method of the rotational linear motion conversion mechanism to be performed, the following steps, that is, “the assembly composed of a combination of the sun shaft main body and the planetary shaft main body A position of the planetary shaft body in which a center line of the planetary shaft body is parallel to a centerline of the solar shaft body is a body reference posture, and the solar shaft body and the planetary shaft body in the basic assembly 1st step of assembling the basic assembly in the main body reference assembly state with the assembly state when the attitude of the planetary shaft main body becomes the main body reference attitude as the main body reference assembly state. , "Second step of preparing a laser displacement meter that can detect a change in the position of the end surface of the planetary shaft through irradiation with a laser beam with the tip surface of the gear support portion of the planetary shaft body as a support portion end surface", " The position of the laser displacement meter with respect to the planetary shaft body is set as a measurement position, and a position predetermined as the measurement position is set as a reference measurement position, and the laser displacement meter with respect to the basic assembly assembled in the first step. A third step of setting the measurement position of the base assembly to the reference measurement position ”,“ a measurement value obtained by irradiating the end surface of the support portion of the base assembly with laser light through the laser displacement meter at the reference measurement position is a first measurement value. The fourth step of measuring the measured value of the above, ”“ the fifth step of assembling the shaft assembly using the assembly formed by the combination of the basic assembly and the annular shaft body as the shaft assembly ”, "Sixth step of setting the measurement position of the laser displacement meter to the reference measurement position with respect to the shaft assembly assembled in step 5", "End surface of the support portion of the shaft assembly through the laser displacement meter at the reference measurement position" The seventh step in which the measured value obtained by irradiating the laser beam on the second measured value is used as a second measured value ”,“ the virtual plane perpendicular to the center line of the solar axis main body as a reference plane, and the main body reference assembly state The basic assembly of The figure obtained by projecting the support part end face in the direction of the center line of the sun shaft main body with respect to the reference plane is a first projected figure, and the support part end face of the shaft assembly assembled in the fifth step The second projection figure is a figure obtained by projecting the image in the direction of the center line of the sun axis main body with respect to the reference plane, and the displacement of the second projection figure with respect to the first projection figure on the reference plane “Eighth step of grasping the end face displacement direction and the end face displacement amount on the basis of the first measurement value and the second measurement value, with the direction and the displacement amount as the end face displacement direction and the end face displacement amount,” An assembly constituted by a combination of an annular gear, the sun gear, and the planetary gear is a gear assembly, and the assembled state of the annular gear, the sun gear, and the planetary gear in the gear assembly, The ring An assembly state in which the center line of the car and the sun gear and the center line of the planetary gear are parallel to each other is a gear reference assembly state, and the gear assembly in the gear reference assembly state is a reference gear assembly. “9th step of assembling the reference gear assembly”, “in relation to the relationship between the shaft assembly and the reference gear assembly, the assemblies are combined when the planetary shaft main body is in the main body reference position. The tenth step of setting the relationship between the shaft assembly assembled in the fifth step and the reference gear assembly assembled in the ninth step as the reference relationship, using the possible relationship as a reference relationship. “The end face of the planetary gear facing the planetary shaft main body is a gear end face, and the shape of the main body insertion portion on the gear end face is an insert end face shape, and the reference is set to the reference relationship in the tenth step. gear A figure obtained by projecting the end face shape of the insertion portion of the assembly in the direction of the center line of the sun axis main body with respect to the reference plane is defined as a third projected figure, and the eighth projected figure with respect to the third projected figure. The figure obtained by reflecting the end face displacement direction and the end face displacement amount grasped in the process is set as a fourth projected figure, and the insertion portion end face shape is set to the state of the reference gear assembly with respect to the shaft assembly. The reference gear set set in the reference relationship in the tenth step, with the state where the fourth projected figure is obtained when projected in the direction of the center line of the sun axis main body with respect to the reference plane An eleventh step of changing the state of the body to the specific state based on the end face displacement direction and the end face displacement amount, and "an assembly constituted by a combination of the shaft assembly and the gear assembly with a gear. As coalescence, and summarized in that to manufacture of the conversion mechanism including a twelfth step "of assembling the gear wheels with collection after passing through the eleventh step.

  In the above invention, the assembly state of the annular gear and the sun gear and the planetary gear in the reference gear assembly is changed to the specific assembly state based on the end face displacement direction and the end face displacement amount. In assembly, for example, when the gear assembly is moved toward the shaft assembly, the planetary shaft main body gear support portion is inserted into the planetary gear main body insertion portion. When the gear assembly is further pushed toward the shaft assembly from this state, the attitude of at least one of the planetary shaft main body and the planetary gear is shifted from the center line of these components due to the contact between the gear support portion and the planetary gear. Since it changes in a direction to absorb (shift with respect to the state where the center lines are parallel to each other), insertion of the gear support portion into the main body insertion portion is allowed. As a result, the shaft assembly and the gear assembly are accurately combined, so that the productivity of the rotational linear motion conversion mechanism can be improved.

  (7) According to a seventh aspect of the present invention, in the manufacturing method of the rotational linear motion conversion mechanism according to the sixth aspect, the eleventh step is to change a rotational phase of the gear assembly relative to a rotational phase of the shaft assembly. A gear rotation phase, the position of the planetary gear with respect to the annular gear and the sun gear in the gear assembly is an inter-gear position, and the gear rotation phase and the inter-gear position in the reference gear assembly in the specific state. Reflecting the end face displacement direction and the end face displacement amount in the reference gear aggregate set in the reference relationship in the tenth step as the specific gear rotation phase and the specific inter-gear position, respectively. The gear rotation phase and the inter-gear position of the gear are adjusted on the condition that they are adapted to the specific gear rotation phase and the specific inter-gear position, respectively. It is the gist.

  (8) According to an eighth aspect of the present invention, in the manufacturing method of the rotational linear motion conversion mechanism according to the sixth or seventh aspect, the seventh step includes the step of irradiating the laser beam through the laser displacement meter before the irradiation with the laser beam. The gist is that it is performed on condition that a constant load is applied to the planetary shaft body.

  In the above invention, the posture of the planetary shaft main body at the time of obtaining the second measurement value through the prior test is performed by performing the work of applying a load to the planetary shaft main body before obtaining the second measurement value. Can be grasped in advance. By the way, when the direction and magnitude of the load applied to the planetary shaft main body are the same, the posture of the planetary shaft main body after applying the load applies the load regardless of the posture of the planetary shaft main body before applying the load. Since it becomes substantially the same every time it performs, it becomes possible to grasp | ascertain the attitude | position of a planetary-axis main body previously as mentioned above. By adopting such a configuration, it becomes possible to set the reference measurement position in consideration of the attitude of the planetary axis body at the time of obtaining the first measurement value and the attitude of the planetary axis body at the time of obtaining the second measurement value. Therefore, the first measurement value and the second measurement value can be acquired more appropriately.

  (9) The invention according to claim 9 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft. The annular shaft includes an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear, and the sun shaft is formed as an external thread. A planetary shaft main body having a planetary screw with a planetary shaft formed as a male screw and a planetary gear formed as an external gear. The annular gear is formed separately from the annular shaft main body, the sun gear is formed separately from the solar shaft main body, the planetary gear is Formed separately from the planetary shaft body A portion provided on the planetary shaft body and capable of supporting the planetary gear is used as a gear support portion, and a space provided on the planetary gear and capable of inserting the gear support portion is used as a main body insertion portion. The planetary shaft is configured by fitting the support portion and the main body insertion portion, the annular screw and the sun screw mesh with the planetary screw, the annular gear and the sun gear, and the The planetary gear meshes with each other, and the other one of the annular shaft and the sun shaft moves linearly through the planetary motion of the planetary shaft accompanying the rotational motion of one of the annular shaft and the sun shaft. In the manufacturing method of the rotational linear motion conversion mechanism to be performed, the following steps, that is, “the assembly composed of a combination of the sun shaft main body and the planetary shaft main body A position of the planetary shaft body in which a center line of the planetary shaft body is parallel to a centerline of the solar shaft body is a body reference posture, and the solar shaft body and the planetary shaft body in the basic assembly 1st step of assembling the basic assembly in the main body reference assembly state with the assembly state when the attitude of the planetary shaft main body becomes the main body reference attitude as the main body reference assembly state. , "Second step of preparing a laser displacement meter that can detect a change in the position of the end surface of the planetary shaft through irradiation with a laser beam with the tip surface of the gear support portion of the planetary shaft body as a support portion end surface", " “A third step of assembling the shaft assembly using the assembly formed by the combination of the basic assembly and the ring shaft main body as the shaft assembly”, “end surface of the support portion of the shaft assembly through the laser displacement meter” Laser light "Fourth step in which the measurement value obtained by irradiation is a reference measurement value", "The virtual plane orthogonal to the center line of the solar axis main body is a reference plane, and the basic assembly in the main body reference assembly state" The support unit of the shaft assembly assembled in the third step, with the figure obtained by projecting the end face of the support part in the direction of the center line of the sun shaft body with respect to the reference plane The figure obtained by projecting the end face with respect to the reference plane in the direction of the center line of the sun axis main body is a second projection figure, and the second projection figure with respect to the first projection figure on the reference plane The fifth step of grasping the end surface displacement direction and the end surface displacement amount based on the reference measurement value, with the displacement direction and the displacement amount as the end surface displacement direction and the end surface displacement amount, respectively, “the annular gear and the sun gear” And the planetary gear The assembly formed by the combination is a gear assembly, and the assembly state of the annular gear, the sun gear, and the planetary gear in the gear assembly, the center line of the annular gear, the sun gear, and the A sixth step of assembling the reference gear assembly using the assembly state in which the center lines of the planetary gears are parallel to each other as a gear reference assembly state, and using the gear assembly in the gear reference assembly state as a reference gear assembly ”,“ Regarding the relationship between the shaft assembly and the reference gear assembly, the relationship in which these assemblies can be combined when the attitude of the planetary shaft main body is the main body reference attitude is used as the reference relationship. “Seventh step of setting the relationship between the shaft assembly assembled in step 3 and the reference gear assembly assembled in step 6 as the reference relationship”, “the planet facing the planetary shaft body” tooth The end face of the reference gear assembly is set to the reference relation in the seventh step, and the shape of the main body insertion portion on the gear end face is set to the insert end face shape. The figure obtained by projecting in the direction of the center line of the sun axis body with respect to the reference plane is a third projected figure, and the end face displacement direction grasped in the fifth step with respect to the third projected figure and The figure obtained by reflecting the end face displacement amount is a fourth projected figure, and the state of the reference gear assembly with respect to the shaft assembly is the end face shape of the insertion portion with respect to the reference surface. The state in which the fourth projection figure is obtained when projected in the direction of the center line is defined as a specific state, and the state of the reference gear aggregate set in the reference relationship in the seventh step is the end face displacement direction and the state end “Eighth step of changing to the specific state based on the amount of surface displacement”, and “Assembly constituted by a combination of the shaft assembly and the gear assembly as a geared assembly, the eighth step is performed. The gist is to manufacture the rotational linear motion conversion mechanism including the “9th step of assembling the geared assembly later”.

  In the above invention, the assembly state of the annular gear and the sun gear and the planetary gear in the reference gear assembly is changed to the specific assembly state based on the end face displacement direction and the end face displacement amount. In assembly, for example, when the gear assembly is moved toward the shaft assembly, the planetary shaft main body gear support portion is inserted into the planetary gear main body insertion portion. When the gear assembly is further pushed toward the shaft assembly from this state, the attitude of at least one of the planetary shaft main body and the planetary gear is shifted from the center line of these components due to the contact between the gear support portion and the planetary gear. Since it changes in a direction to absorb (shift with respect to the state where the center lines are parallel to each other), insertion of the gear support portion into the main body insertion portion is allowed. As a result, the shaft assembly and the gear assembly are accurately combined, so that the productivity of the rotational linear motion conversion mechanism can be improved.

  (10) The invention according to claim 10 is the method for producing the rotational linear motion conversion mechanism according to claim 9, wherein the eighth step sets the rotational phase of the gear assembly relative to the rotational phase of the shaft assembly. A gear rotation phase, the position of the planetary gear with respect to the annular gear and the sun gear in the gear assembly is an inter-gear position, and the gear rotation phase and the inter-gear position in the reference gear assembly in the specific state. By reflecting the end face displacement direction and the end face displacement amount in the reference gear aggregate set in the reference relationship in the seventh step as the specific gear rotation phase and the specific inter-gear position, respectively, the reference gear aggregate is reflected. The gear rotation phase and the inter-gear position of the gear are adjusted on the condition that they are adapted to the specific gear rotation phase and the specific inter-gear position, respectively. It is the gist.

  (11) According to an eleventh aspect of the present invention, in the manufacturing method of the rotational linear motion conversion mechanism according to the ninth or tenth aspect, the fifth step is a support portion end surface of the reference gear assembly that is grasped in advance. The gist is that it is performed on the condition that the end face displacement direction and the end face displacement amount are grasped on the basis of the position and the measured value of the reference.

  (12) The invention according to claim 12 is the method of manufacturing a rotational linear motion conversion mechanism according to any one of claims 9 to 11, wherein the fourth step irradiates laser light through the laser displacement meter. The gist of the present invention is that it is performed on condition that a constant load is applied to the planetary shaft body before the operation.

  In the above-described invention, the posture of the planetary shaft body at the time of obtaining the reference measurement value is obtained in advance through a preliminary test by performing a task of applying a load to the planetary shaft body before obtaining the reference measurement value. It is possible to grasp. By the way, when the direction and magnitude of the load applied to the planetary shaft main body are the same, the posture of the planetary shaft main body after applying the load applies the load regardless of the posture of the planetary shaft main body before applying the load. Since it becomes substantially the same every time it performs, it becomes possible to grasp | ascertain the attitude | position of a planetary-axis main body previously as mentioned above. By adopting such a configuration, it becomes possible to set the reference measurement position in consideration of the attitude of the planetary shaft body at the time of acquisition of the reference measurement value, so that the reference measurement value can be acquired more appropriately. become.

  (13) The invention according to claim 13 is the method of manufacturing a rotating linear motion conversion mechanism according to any one of claims 1 to 12, wherein the assembly of the geared assembly is performed in the shaft assembly. The planetary shaft main body can change the posture between the annular shaft main body and the sun shaft main body, and in the gear assembly, the planetary gear has a posture between the annular gear and the sun gear. The gist is that it is performed on condition that it can be changed.

  An embodiment of the present invention will be described with reference to FIGS. Below, it demonstrates according to the order of the structure of the rotation linear motion conversion mechanism assembled through the manufacturing method of this embodiment, the operation | movement aspect of the conversion mechanism, and the manufacturing method of a rotation linear motion conversion mechanism.

<Structure of rotating linear motion conversion mechanism>
With reference to FIG.1 and FIG.2, the outline of the structure of the rotation linear motion conversion mechanism 1 is demonstrated.
FIG. 1 shows a perspective structure of the rotating linear motion conversion mechanism 1.
FIG. 2 shows a perspective structure inside the rotary linear motion conversion mechanism 1.

  The rotary linear motion conversion mechanism 1 includes a ring shaft 2 having a space extending in the axial direction therein, a sun shaft 3 disposed inside the ring shaft 2, and a plurality of planetary shafts 4 disposed around the sun shaft 3. It is comprised by the combination. The planetary shafts 4 are arranged at equal intervals around the sun shaft 3. In the present embodiment, the posture in which the center line of the planetary shaft 4 is parallel to the center line of the sun shaft 3 and the posture of the planetary shaft 4 in which the center line is substantially parallel are defined as the main body reference posture.

  In the rotational linear motion conversion mechanism 1, one of the components of the ring shaft 2 and each planetary shaft 4 is engaged by meshing between the screws and gears provided on the ring shaft 2 and the screws and gears provided on each planetary shaft 4. Force is transmitted to the other component. Further, due to the engagement of the screw and gear provided on the sun shaft 3 and the screw and gear provided on each planetary shaft 4, a force is applied from one component of the sun shaft 3 and each planetary shaft 4 to the other component. Communicated.

  The rotating linear motion conversion mechanism 1 operates as follows based on the combination of these components. That is, when one component of the ring shaft 2 and the sun shaft 3 rotates, each planetary shaft 4 performs a planetary motion around the sun shaft 3 through the force transmitted from the component. Thereby, the component moves in the axial direction with respect to each planetary shaft 4 through the force transmitted from each planetary shaft 4 to the other component of the ring shaft 2 and the sun shaft 3.

  As described above, the rotational linear motion conversion mechanism 1 converts the rotational motion of one of the ring shaft 2 and the sun shaft 3 into the other linear motion of the ring shaft 2 and the sun shaft 3. In the present embodiment, with respect to the axial direction of the sun shaft 3, the direction in which the sun shaft 3 is pushed out from the ring shaft 2 is the front direction FR, and the direction in which the sun shaft 3 is pulled into the ring shaft 2 is the back direction RR. Yes. Further, when an arbitrary position of the rotational linear motion conversion mechanism 1 is used as a reference, a range on the front direction FR side from the reference position is a front side, and a range on the back direction RR side from the reference position is a back side. Yes.

  A front collar 51 and a rear collar 52 that support the sun shaft 3 are fixed to the ring shaft 2. That is, the ring shaft 2, the front collar 51, and the rear collar 52 move integrally. In the ring shaft 2, the opening on the front side is closed by the front collar 51. Further, the opening on the back side is closed by the back collar 52.

  The sun shaft 3 is supported by a bearing 51A of the front collar 51 and a bearing 52A of the rear collar 52. On the other hand, each planetary shaft 4 is not supported by either the front collar 51 or the rear collar 52. That is, in the rotational linear motion conversion mechanism 1, the radial position of the sun shaft 3 is restrained by the engagement of the screw and gear and the front collar 51 and the rear collar 52, while the radial direction of each planetary shaft 4 is The position is constrained only by the engagement of the screw and gear.

  The rotating linear motion conversion mechanism 1 employs the following structure to lubricate the inside of the ring shaft 2 (where the screws and gears of the ring shaft 2, the sun shaft 3 and each planetary shaft 4 are engaged). Has been. That is, a plurality of oil holes 51 </ b> H for supplying lubricating oil to the inside of the ring shaft 2 are formed in the front collar 51. An O-ring 53 that seals the inside of the ring shaft 2 is attached to each of the front collar 51 and the rear collar 52.

[1] “Ring shaft structure”
The structure of the ring shaft 2 will be described with reference to FIGS. 3 and 4.
FIG. 3A shows the front structure of the ring shaft 2.
FIG. 3B shows a planar structure of the ring shaft 2.
FIG. 4A shows a cross-sectional structure of the ring shaft 2 along the DA-DA line.
FIG. 4B shows a cross-sectional structure in which a part of the ring shaft 2 is disassembled.

  The ring shaft 2 is constituted by a combination of a ring shaft main body 21, a front ring gear 22 and a rear ring gear 23. In the ring shaft 2, the center line (axis line) of the ring shaft main body 21 corresponds to the center line (axis line) of the ring shaft 2.

  The ring shaft main body 21 includes a main body screw portion 21A having an internal thread (annular screw 24) formed on the inner peripheral surface, a main body gear portion 21B to which the front ring gear 22 is assembled, and a main body gear portion to which the rear ring gear 23 is assembled. 21C.

  The front ring gear 22 is formed separately from the ring shaft main body 21 as a flat-toothed internal gear. Further, when assembled to the ring shaft main body 21, its own center line is configured to match the center line of the ring shaft main body 21. In the present embodiment, the front ring gear 22 is fixed to the ring shaft main body 21 by press-fitting as to how the front ring gear 22 is assembled to the ring shaft main body 21. The front ring gear 22 can be fixed to the ring shaft main body 21 by a method other than press fitting.

  The back ring gear 23 is formed separately from the ring shaft main body 21 as a flat-toothed internal gear. Further, when assembled to the ring shaft main body 21, its own center line is configured to match the center line of the ring shaft main body 21. In the present embodiment, the back ring gear 23 is fixed to the ring shaft main body 21 by press-fitting as to how the back ring gear 23 is assembled to the ring shaft main body 21. The back ring gear 23 can be fixed to the ring shaft main body 21 by a method other than press fitting.

  In the ring shaft 2, the front ring gear 22 and the rear ring gear 23 are configured as gears having the same shape. That is, the specifications (reference pitch circle diameter, number of teeth, etc.) of the front ring gear 22 and the rear ring gear 23 are set to be equal to each other.

[2] "Sunshaft structure"
The structure of the sun shaft 3 will be described with reference to FIG.
FIG. 5A shows a front structure of the sun shaft 3.
FIG. 5B shows a front structure in a state where a part of the sun shaft 3 is disassembled.

  The sun shaft 3 is configured by a combination of a sun shaft main body 31 and a back sun gear 33. In the sun shaft 3, the center line (axis line) of the sun shaft main body 31 corresponds to the center line (axis line) of the sun shaft 3.

  The sun shaft main body 31 is assembled with a main body screw portion 31A having a male screw (sun screw 34) formed on the outer peripheral surface, a main body gear portion 31B having a spur external gear (front sun gear 32), and a rear sun gear 33. And the main body gear portion 31C.

  The rear sun gear 33 is formed as a spur external gear separately from the sun shaft main body 31. Further, when assembled to the sun shaft main body 31, the center line of the sun shaft main body 31 is aligned with the center line of the sun shaft main body 31. In the present embodiment, the back sun gear 33 is fixed to the sun shaft main body 31 by press-fitting as to how the back sun gear 33 is assembled to the sun shaft main body 31. The back sun gear 33 can be fixed to the sun shaft main body 31 by a method other than press fitting.

  In the sun shaft 3, the front sun gear 32 and the rear sun gear 33 are configured as gears having the same shape. That is, the specifications (reference pitch circle diameter, number of teeth, etc.) of the front sun gear 32 and the back sun gear 33 are set to be equal to each other.

[3] “Planetary shaft structure”
The structure of the planetary shaft 4 will be described with reference to FIG.
FIG. 6A shows the front structure of the planetary shaft 4.
FIG. 6B shows a front structure in a state where a part of the planetary shaft 4 is disassembled.
FIG. 6C shows a cross-sectional structure of the back planetary gear 43 along the center line.

  The planetary shaft 4 is configured by a combination of a planetary shaft main body 41 and a back planetary gear 43. In the planetary shaft 4, the center line (axis line) of the planetary shaft body 41 corresponds to the center line (axis line) of the planetary shaft 4. In other words, the planetary shaft 4 is secured to the sunshaft 3 such that the centerline of the planetary shaft body 41 is parallel or substantially parallel to the centerline of the sunshaft 3, thereby securing its own body reference posture. The

  The planetary shaft main body 41 includes a main body screw portion 41A having a male screw (planetary screw 44) formed on the outer peripheral surface, a main body gear portion 41B having a spur external gear (front planetary gear 42), and a rear planetary gear 43. The rear side shaft 41R is assembled, and the front side shaft 41F fitted into a jig when the rotary linear motion conversion mechanism 1 is assembled. In the planetary shaft main body 41, the front side shaft 41 </ b> F is formed from the end of the front planetary gear 42 to the front side end surface (shaft front end surface 41 </ b> G) of the planetary shaft main body 41. Further, the back side shaft 41R is formed from the end of the planetary screw 44 to the back side end surface (shaft back end surface 41S) of the planetary shaft main body 41. The front end portion of the front shaft 41F including the shaft front end surface 41G corresponds to the front end portion of the planetary shaft main body 41 (shaft front end portion 41H). Further, the front end portion of the rear side shaft 41R including the shaft back end surface 41S corresponds to the rear side front end portion (shaft rear end front end portion 41T) of the planetary shaft main body 41. In the present embodiment, the back side shaft 41R corresponds to the gear support portion.

  The back planetary gear 43 is formed separately from the planetary shaft main body 41 as a spur external gear. Further, the rear shaft 41R of the planetary shaft main body 41 is assembled to the planetary shaft main body 41 by being inserted into the bearing hole 43H through one opening (bearing opening 43I) of the bearing hole 43H. Further, the one end face (planetary front end face 43F) is assembled to the planetary shaft main body 41 in a state where it is in contact with the planetary shaft main body 41. Further, in the state where it is assembled to the planetary shaft main body 41, its own center line is configured to be aligned with the center line of the planetary shaft main body 41. In the present embodiment, the bearing hole 43H corresponds to the main body insertion portion.

  With respect to the manner of assembling the back planetary gear 43 with respect to the planetary shaft main body 41, in this embodiment, a clearance fit is adopted so that the back planetary gear 43 can rotate with respect to the planetary shaft main body 41. In addition, as an assembling mode for obtaining relative rotation between the planetary shaft main body 41 and the back planetary gear 43, an assembling mode other than clearance fitting can be adopted.

  In the planetary shaft 4, the front planetary gear 42 and the rear planetary gear 43 are configured as gears having the same shape. That is, the specifications (reference pitch circle diameter, the number of teeth, etc.) of the front planetary gear 42 and the back planetary gear 43 are set to be equal to each other.

[4] “Relationship between components”
With reference to FIGS. 7-10, the relationship of each component in the rotation linear motion conversion mechanism 1 is demonstrated. In addition, although the rotation linear motion conversion mechanism 1 of the structure provided with the nine planetary shafts 4 is illustrated here, the number of arrangement | positioning of the planetary shafts 4 can be changed suitably.
FIG. 7 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the center line of the sun shaft 3.
FIG. 8 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the DB-DB line of FIG.
FIG. 9 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the DC-DC line of FIG.
FIG. 10 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the line DD-DD in FIG.

In the rotating linear motion conversion mechanism 1, the operation of each component is allowed or restricted as follows.
(A) About the ring shaft 2, relative rotation with the ring shaft main body 21, the front ring gear 22, and the back ring gear 23 is made impossible. Further, relative rotation between the ring shaft main body 21 and the front collar 51 and the rear collar 52 is disabled.
(B) About the sun shaft 3, relative rotation between the sun shaft main body 31 and the back sun gear 33 is disabled.
(C) About the planetary shaft 4, relative rotation between the planetary shaft main body 41 and the back planetary gear 43 is allowed.

  In the rotary linear motion conversion mechanism 1, the force is transmitted between these components through the engagement of screws and gears of the ring shaft 2, the sun shaft 3, and the planetary shafts 4 as follows.

  In the ring shaft 2 and each planetary shaft 4, the ring screw 24 of the ring shaft main body 21 and the planetary screw 44 of each planetary shaft main body 41 are engaged with each other. Further, the front ring gear 22 of the ring shaft main body 21 and the front planetary gear 42 of each planetary shaft main body 41 are engaged with each other. Further, the rear ring gear 23 of the ring shaft main body 21 and the rear planetary gear 43 of each planetary shaft main body 41 are engaged with each other.

  As a result, when a rotational motion is input to one of the ring shaft 2 and each planetary shaft 4, the ring screw 24 and the planetary screw 44 are engaged, the front ring gear 22 and the front planetary gear 42 are engaged, and the rear ring. A force is transmitted to the other of the ring shaft 2 and each planetary shaft 4 through the meshing of the gear 23 and the rear planetary gear 43.

  In the sun shaft 3 and each planetary shaft 4, the sun screw 34 of the sun shaft main body 31 and the planetary screw 44 of each planetary shaft main body 41 are engaged with each other. Further, the front sun gear 32 of the sun shaft main body 31 and the front planetary gear 42 of each planetary shaft main body 41 are engaged with each other. Further, the rear sun gear 33 of the sun shaft main body 31 and the rear planetary gear 43 of each planetary shaft main body 41 are engaged with each other.

  Thus, when a rotational motion is input to one of the sun shaft 3 and each planetary shaft 4, the sun screw 34 and the planetary screw 44 are engaged, the front sun gear 32 and the front planetary gear 42 are engaged, and the rear sun gear 33 is engaged. A force is transmitted to the other of the sun shaft 3 and each planetary shaft 4 through meshing with the rear planetary gear 43.

  As described above, the rotational linear motion conversion mechanism 1 is composed of the ring screw 24 of the ring shaft 2, the sun screw 34 of the sun shaft 3, and the planetary screw 44 of each planetary shaft 4. A speed reduction mechanism constituted by the front sun gear 32 and each front planetary gear 42 and a speed reduction mechanism constituted by the rear ring gear 23, the rear sun gear 33 and each rear planetary gear 43 are provided.

<Operation Mode of Rotating Linear Motion Conversion Mechanism>
In the rotational linear motion conversion mechanism 1, an operation method (motion conversion method) for converting rotational motion into linear motion is determined based on the setting mode of the number of teeth of each gear and the number of threads of each screw. That is, as a motion conversion method, either a sun axis displacement method in which the sun shaft 3 is linearly moved by the rotational motion of the ring shaft 2 or an annular shaft displacement method in which the ring shaft 2 is linearly moved by the rotational motion of the sun shaft 3 is selected. Can be selected. Hereinafter, the operation | movement aspect of the rotation linear motion conversion mechanism 1 in each motion conversion system is demonstrated.

  (A) When the solar axis displacement method is adopted as the motion conversion method, conversion from rotational motion to linear motion is performed as follows. That is, when a rotational motion is input to the ring shaft 2, the front ring gear 22 and the front planetary gear 42 mesh with each other, the rear ring gear 23 and the rear planetary gear 43 mesh with each other, and the annular screw 24 and each planetary screw. As the force is transmitted from the ring shaft 2 to each planetary shaft 4 through the meshing with 44, each planetary shaft 4 revolves around the sun shaft 3 while rotating. In accordance with the planetary motion of the planetary shaft 4, the front planetary gears 42 and the front sun gear 32 are engaged, the rear planetary gears 43 and the rear sun gear 33 are engaged, and the planetary screws 44 and the sun screws 34 are engaged. When the force is transmitted from each planetary shaft 4 to the sun shaft 3 through the sun shaft 3, the sun shaft 3 is displaced in the axial direction.

  (B) In the case where the annular shaft displacement method is adopted as the motion conversion method, conversion from rotational motion to linear motion is performed as follows. That is, when a rotational motion is input to the sunshaft 3, the front sun gear 32 and each front planetary gear 42 are engaged, the rear sun gear 33 and each rear planetary gear 43 are engaged, and the sun screw 34 and each planetary screw 44 are engaged. By transmitting force from the sun shaft 3 to each planetary shaft 4 through the meshing, each planetary shaft 4 revolves while rotating around the sun shaft 3. In accordance with the planetary motion of the planetary shaft 4, the front planetary gears 42 and the front ring gear 22 are engaged, the rear planetary gears 43 and the rear ring gear 23 are engaged, and the planetary screws 44 and the annular screws 24. When the force is transmitted from each planetary shaft 4 to the ring shaft 2 through the meshing with the ring shaft 2, the ring shaft 2 is displaced in the axial direction.

<Method for manufacturing rotational linear motion conversion mechanism>
With reference to FIGS. 11-32, the manufacturing method of the rotation linear motion conversion mechanism 1 of this embodiment is demonstrated. The following [1] describes the outline of the manufacturing method of the present embodiment, and [2] describes the details of the manufacturing method of the present embodiment.

[1] "Outline of manufacturing method"
In the manufacturing process of the rotational linear motion conversion mechanism 1 of the present embodiment, the relationship between the rotational phase of the rear ring gear 23 and the rotational phase of the rear sun gear 33, the rotational phase of the rear ring gear 23 and the rear sun gear 33, and each rear surface. In consideration of the relationship with the rotational phase of the planetary gear 43, it is necessary to mesh the back ring gear 23 and the back sun gear 33 with each back planetary gear 43. Therefore, from the viewpoint of workability and work efficiency, it is considered desirable to assemble the rotary linear motion conversion mechanism 1 according to the following procedures (A) to (D).
(A): An assembly (shaft assembly 92 (FIG. 23)) constituted by a combination of the ring shaft main body 21, the sun shaft main body 31, and each planetary shaft main body 41 is assembled.
(B): An assembly (gear assembly 93 (FIG. 28)) constituted by a combination of the rear ring gear 23, the rear sun gear 33, and each rear planetary gear 43 is assembled.
(C): The main assembly 94 (FIG. 31) is assembled by combining the shaft assembly 92 and the gear assembly 93.
(D): The rotation linear motion conversion mechanism 1 is assembled by assembling other components to the main assembly 94.

Therefore, in the manufacturing method of the present embodiment, the rotating linear motion conversion mechanism 1 is manufactured including the procedures (A) to (D). As for the assembly of the main assembly 94, the following assembly procedure is adopted for the shaft assembly 92 from the viewpoint of workability and work efficiency.
(E): An assembly (base assembly 91 (FIG. 16)) constituted by a combination of the sun shaft main body 31 and each planetary shaft main body 41 is assembled.
(F): The shaft assembly 92 is assembled by combining the base assembly 91 and the ring shaft main body 21.

  Here, the state and mutual relationship of the base assembly 91, the shaft assembly 92, and the gear assembly 93 are defined as shown below. In the present embodiment, the base assembly 91 corresponds to a basic assembly. The shaft assembly 92 corresponds to a shaft assembly. The gear assembly 93 corresponds to a gear assembly. Further, a reference gear assembly 93A described below corresponds to a reference gear assembly.

  Regarding the assembled state of each component in the base assembly 91, the planetary shaft bodies 41 are arranged at equal intervals around the sunshaft body 31, and the centerline of each planetary shaft body 41 is the centerline of the sunshaft body 31. An assembly state (an assembly state when the posture of each planetary shaft main body 41 is the main body reference posture) that is parallel to the first reference assembly state. Further, the base assembly 91 in the first reference assembled state is referred to as a reference base assembly 91A.

  Regarding the assembled state of each component in the shaft assembly 92, the planetary shaft bodies 41 are arranged at equal intervals around the sunshaft body 31 and the centerline of each planetary shaft body 41 is the centerline of the sunshaft body 31. An assembly state (an assembly state when each planetary shaft main body 41 is in the main body reference posture) in parallel with each other is defined as a second reference assembly state. The shaft assembly 92 in the second reference assembled state is referred to as a reference shaft assembly 92A. Further, at least one of the planetary shaft bodies 41 is in an assembled state in which the center line is not parallel to the center line of the sunshaft body 31 (at least one attitude of each planetary shaft body 41 is the main body reference attitude) The assembly state when it is different from the above is the inclined assembly state.

  Regarding the assembled state of each component in the gear assembly 93, the back planetary gears 43 are arranged at equal intervals around the back sun gear 33, and the center line of the back ring gear 23, the center line of the back sun gear 33, and each back planetary An assembly state in which the center lines of the gears 43 are parallel to each other is defined as a third reference assembly state. Further, the gear assembly 93 in the third reference assembled state is referred to as a reference gear assembly 93A. Further, the position of the rear planetary gear 43 with respect to the rear ring gear 23 and the rear sun gear 33 (the position of the rear planetary gear 43 between the rear ring gear 23 and the rear sun gear 33) is set as the inter-gear position. Further, the rotational phase of the gear assembly 93 with respect to the rotational phase of the shaft assembly 92 is defined as a gear rotational phase. Further, the posture of the gear assembly 93 with respect to the shaft assembly 92 is assumed to be an opposite-axis posture. Further, the opposite-axis posture when the center line of the sunshaft main body 31 and the centerline of the rear sun gear 33 are aligned is set as a reference opposite-axis posture. In the gear assembly 93, since the backlash exists between the back ring gear 23 and the back sun gear 33 and each back planetary gear 43, the position between the gears can be changed within the backlash range.

  Regarding the inter-gear position and the gear rotation phase of the reference gear assembly 93A, the inter-gear position and the gear that can be combined with each other when the reference gear assembly 93A in the reference-to-axis attitude is translated toward the reference shaft assembly 92A. The rotation phases are respectively the reference compatible gear position and the reference compatible gear rotation phase.

  Regarding the state (reference shaft state) of the reference gear assembly 93A with respect to the shaft assembly 92, the opposite shaft when the opposite shaft posture is the reference opposite shaft posture, the inter-gear position is the reference compatible gear position, and the gear rotation phase is the reference compatible gear rotation phase. The state is the standard conformity state. That is, the reference conformation state is a pair of the case where the center line of the sun shaft main body 31 and the center line of the rear sun gear 33 are aligned and the center line of each planetary shaft main body 41 is aligned with the center line of each rear planetary gear 43. Corresponds to the shaft state. In other words, this corresponds to a counter-axis state in which the reference gear assembly 93A can be assembled to the reference shaft assembly 92A by translating the reference gear assembly 93A toward the reference shaft assembly 92A.

  Regarding the relationship between the shaft assembly 92 and the gear assembly 93, the basic relationship is the relationship when the center line of the sun shaft body 31 and the center line of the rear sun gear 33 are aligned. In other words, the basic relationship corresponds to a relationship that is established between the shaft assembly 92 and the gear assembly 93 in the reference counter-axis posture.

  In addition, in the basic relationship, the relationship when the center line of each planetary shaft main body 41 and the center line of each back planetary gear 43 are aligned is referred to as a matching relationship. That is, the conforming relationship corresponds to the establishment of the relationship between the reference shaft assembly 92A and the reference gear assembly 93A in the reference conforming state. In other words, this corresponds to a relationship in which these assemblies are combined when the reference gear assembly 93A is translated toward the reference shaft assembly 92A.

  In addition, regarding the relationship of conformity, the relationship when the assembly state of the reference shaft assembly 92A is changed to the inclined assembly state is regarded as an inappropriate relationship. That is, the unsuitable relationship corresponds to a relationship that is established between the shaft assembly 92 in the inclined assembly state and the reference gear assembly 93A in the reference conforming state. In other words, when the reference gear assembly 93A in the reference conforming state is translated toward the shaft assembly 92, the shaft assembly 92 and the reference gear assembly 93A cannot be combined because the shaft assembly 92 is in the inclined assembly state. It corresponds to.

  By the way, in the actual assembly operation of the shaft assembly 92, it is the present application that the shaft assembly 92 is assembled in an inclined assembled state by the attitude of the planetary shaft main body 41 being inclined with respect to the main body reference attitude when each component is combined. Confirmed by the inventor. When the shaft assembly 92 is assembled in the tilted assembly state, the relationship between the shaft assembly 92 and the gear assembly 93 cannot be set to the above-described compatible relationship, so that the reference gear assembly 93A in the reference compatible state is attached to the shaft assembly 92. These assemblies cannot be combined even if they are moved parallel to each other. That is, since the back side shaft 41R of the planetary shaft main body 41 is not inserted into the bearing hole 43H in the at least one back planetary gear 43, the main assembly 94 cannot be assembled. When such a situation occurs, the combination work of the shaft assembly 92 and the gear assembly 93 is temporarily interrupted, resulting in a decrease in productivity.

  Incidentally, in the rotating linear motion conversion mechanism 1, the number of threads of each component is set to a different number, so when the screws of each component are engaged, a backlash is formed between these screws. Moreover, the magnitude | size of this backlash changes according to the setting aspect of the number of strips of each screw. Accordingly, when a force is applied to the planetary shaft main body 41 as the shaft assembly 92 is assembled in the manufacturing process of the rotary linear motion conversion mechanism 1, the planetary shaft main body 41 is moved in the direction in which the backlash is applied. The shaft assembly 92 may be assembled in a state in which 41 is inclined with respect to the main body reference posture. That is, the shaft assembly 92 in an inclined assembled state may be assembled. In the present embodiment, the ring shaft body 21 is assembled to the base assembly 91 to assemble the shaft assembly 92. Therefore, when the annular screw 24 is engaged with the planetary screw 44, the planetary shaft is moved from the ring shaft body 21. When the force is applied to the main body 41, the planetary shaft main body 41 is inclined as described above.

In the shaft assembly 92, the planetary shaft body 41 is basically inclined according to the following rules (a) and (b). Actually, the tilting is performed in such a manner that the circumferential tilt by (a) and the radial tilt by (b) are combined.
(A) The planetary shaft body 41 has a circumferential direction (clockwise direction or counterclockwise direction) of the sun shaft body 31 according to the lead angle of the sun screw 34 of the sun shaft body 31 or the lead angle of the annular screw 24 of the ring shaft body 21. ) Fall down.
(B) Tilt in the radial direction so as to fill backlash between the sun screw 34 and the planetary screw 44 or backlash between the annular screw 24 and the planetary screw 44.

In the present embodiment, the shaft assembly 92 and the gear assembly 93 are combined to include the following operations (A) to (D) in order to suppress the decrease in productivity due to the inclination of the planetary shaft main body 41. I have to.
(A): A measurement value obtained by irradiating each planetary shaft body 41 of the reference base assembly 91A with laser light through the laser displacement meter 7 is defined as a first measurement value RA (FIG. 17).
(B): A measured value obtained by irradiating each planetary shaft body 41 of the shaft assembly 92 with laser light through the laser displacement meter 7 is defined as a second measured value RB (FIG. 27).
(C): The inclination degree of each planetary shaft main body 41 with respect to the main body reference posture is grasped based on the first measurement value RA and the second measurement value RB. That is, the shift between the position of the shaft back end surface 41S of the reference base assembly 91A and the position of the shaft back end surface 41S of the shaft assembly 92 is grasped.
(D): The state of the reference gear assembly 93 </ b> A with respect to the shaft assembly 92 is changed to that of the planetary shaft main body 41 so that each back planetary gear 43 of the reference gear assembly 93 </ b> A can be assembled to each planetary shaft main body 41 of the shaft assembly 92. Change based on the degree of tilt. That is, as the state of the reference gear assembly 93A with respect to the shaft assembly 92, at least one of the inter-gear position and the gear rotation phase is changed based on the displacement of the position of the shaft back end surface 41S.

  It should be noted that the laser displacement meter 7 is configured so that the measured value obtained by irradiating the laser beam when the measurement target is at the reference position and the laser beam when the measurement target is at a position (specific position) different from the reference position. Based on the comparison with the measurement value obtained by irradiating the light, the apparatus is provided with an arithmetic unit capable of calculating the movement direction and the movement amount from the reference position to the specific position.

  Here, the reason why the shaft assembly 92 and the gear assembly 93 can be accurately combined by including the operations (A) to (D) in the manufacturing process of the rotary linear motion conversion mechanism 1 will be described. .

  For shafts and bearings in a fitting relationship, when inserting the shaft into the bearing hole, the relationship between the shaft and the bearing is basically set so that the shaft center line and the bearing center line are aligned. Need to be. However, even if the shaft center line and the center line of the bearing hole are not aligned, when the posture of the shaft and the bearing is not restricted, the shaft and the bearing are inserted by inserting at least the tip of the shaft into the bearing hole. Can be fitted together. That is, in a state where the posture of the shaft and the bearing is not constrained, when the shaft is pushed in the insertion direction with the tip of the shaft inserted in the hole of the bearing, Since the deviation of the wire is absorbed, the shaft and the bearing are fitted together.

  For this reason, the state of the shaft assembly 92 so that the following [Condition 1], [Condition 2], and [Condition 3] are satisfied based on the shaft assembly 92 and the reference gear assembly 93A that are in an inappropriate relationship, By setting the state of the reference gear assembly 93A and the relationship between the shaft assembly 92 and the reference gear assembly 93A, the reference gear assembly 93A can be accurately assembled to the shaft assembly 92 in the inclined assembly state. I can say that.

[Condition 1]: “With respect to the shaft assembly 92, each planetary shaft main body 41 is in a state in which the posture can be changed with respect to the ring shaft main body 21 and the sun shaft main body 31.”
In the shaft assembly 92, there is a backlash between the annular screw 24 and the sun screw 34 and each planetary screw 44, and between the front ring gear 22 and the front sun gear 32 and each front planetary gear 42. Basically, each planetary shaft main body 41 is in a state where the attitude relative to the ring shaft main body 21 and the sun shaft main body 31 can be changed by the amount of backlash. Therefore, when assembling the main assembly 94, the [Condition 1] can be established by not restraining the posture of each planetary shaft body 41 with a jig or the like.

[Condition 2]: “With respect to the gear assembly 93, each rear planetary gear 43 is in a state in which the posture can be changed with respect to the rear ring gear 23 and the rear sun gear 33.”
In the gear assembly 93, there is a backlash between the back ring gear 23 and the back sun gear 33 and each back planetary gear 43. Therefore, basically, each back planetary gear 43 is connected to the back ring gear 23 and the back sun gear 33. It is in a state where the attitude to can be changed by the amount of backlash. Therefore, when assembling the main assembly 94, it is possible to satisfy the above [Condition 2] by not restraining the posture of each rear planetary gear 43 with a jig or the like.

[Condition 3]: “Regarding the relationship between the shaft assembly 92 in the inclined assembly state and the reference gear assembly 93A, when the reference gear assembly 93A is translated toward the shaft assembly 92, the bearing hole 43H of the rear planetary gear 43 is displaced. The shaft rear end portion 41T of the planetary shaft body 41 is set to be inserted (correction relationship). "
Here, with respect to the inter-gear position and the gear rotation phase of the reference gear assembly 93 </ b> A, when the reference gear assembly 93 </ b> A in the reference-to-axis posture is translated toward the shaft assembly 92 in the inclined assembly state, the rear planetary gear 43. The inter-gear position and the gear rotation phase at which at least the shaft back end portion 41T of the planetary shaft main body 41 can be inserted into the bearing hole 43H are set as the inclination-adapted gear position and the inclination-adapted gear rotation phase, respectively.

  Further, with respect to the state of the reference gear assembly 93A with respect to the shaft assembly 92 (opposite shaft state), when the paired shaft posture is the reference paired shaft posture, the inter-gear position is the tilt compatible gear position, and the gear rotation phase is the tilt compatible gear rotation phase. The opposite-axis state is set to the tilt compatible state. That is, the inclination matching state is a state in which the center line of the sun shaft main body 31 and the center line of the rear sun gear 33 are aligned, while the center line of each planetary shaft main body 41 and the center line of each rear planetary gear 43 are not aligned. When the reference gear assembly 93A is translated toward the shaft assembly 92, this corresponds to a counter-axial state in which at least the shaft rear end portion 41T of the planetary shaft main body 41 can be inserted into the bearing hole 43H of the rear planetary gear 43. .

  Based on such a definition of the reference gear assembly 93A, the above correction relationship can be rephrased as a relationship when the opposite-axis state of the reference gear assembly 93A is changed to the tilt compatible state in an inappropriate relationship. That is, the correction relationship corresponds to the relationship established between the shaft assembly 92 in the tilt assembly state and the reference gear assembly 93A in the tilt matching state.

  [Condition 3] can be established by changing the state of the reference gear assembly 93A (at least one of the inter-gear position and the gear rotation phase) as described below. Hereinafter, with reference to FIG. 11 and FIG. 12, a procedure for satisfying the above [Condition 3] will be described.

  Here, a virtual plane orthogonal to the center line O of the sun shaft main body 31 between the shaft assembly 92 and the gear assembly 93 that are in a basic relationship is defined as a reference plane P. Further, a figure obtained by projecting the shaft back end surface 41S of the shaft assembly 92 in the direction of the center line O with respect to the reference plane P is referred to as a tip portion projected figure ZS. Further, the shape of the bearing hole 43H in the planetary front end face 43F of the back planetary gear 43, that is, the shape of the bearing opening 43I on the plane to which the planetary front end face 43F belongs is formed as an opening. In addition, a figure obtained by projecting the opening shape of the gear assembly 93 in the direction of the center line O with respect to the reference plane P is referred to as an opening projection figure ZG. Further, the tip projection graphic ZS of the shaft assembly 92 (the tip projection graphic ZS of the reference shaft assembly 92A) in the relationship of conformity is referred to as a first tip projection graphic ZS1. Further, the tip projection graphic ZS of the shaft assembly 92 in an inappropriate relationship (the tip projection graphic ZS of the shaft assembly 92 in the tilted assembly state) is set as the second tip projection graphic ZS2. Further, the opening projection figure ZG of the gear assembly 93 in the relationship of conformity (the opening projection figure ZG of the reference gear assembly 93A in the reference conformity state) is set as the first opening projection figure ZG1. Further, the opening projection graphic ZG of the gear assembly 93 in the correction relationship (the opening projection graphic ZG of the reference gear assembly 93A in the tilt matching state) is set as the second opening projection graphic ZG2. Since the reference shaft assembly 92A is an assembly configured by combining the reference base assembly 91A and the ring shaft main body 21, the shaft back end surface 41S of the reference base assembly 91A is in the direction of the center line O with respect to the reference plane P. The figure obtained by projecting onto the first tip projection figure ZS1 is the same.

  FIG. 11 shows the relationship between the shaft assembly 92 and the gear assembly 93 and the reference plane P. FIG. 12 shows the relationship between the first tip projection graphic ZS1, the second tip projection graphic ZS2, the first opening projection graphic ZG1, and the second opening projection graphic ZG2 on the reference plane P. In FIG. 12, the interval between the first tip projection graphic ZS1 and the second tip projection graphic ZS2 and the interval between the first opening projection graphic ZG1 and the second opening projection graphic ZG2 are exaggerated more than actual. Is expressed. In addition, although the shape of the first tip projection graphic ZS1 and the shape of the second tip projection ZS2 are actually different, they are expressed as the same shape because the difference in shape is minute.

  When the shaft assembly 92 and the reference gear assembly 93A are in an inappropriate relationship, part or all of the tip projection graphic ZS (second tip projection ZS2) is an opening projection ZG (first opening projection ZG1). Located outside of. That is, the state in which at least a part of the tip projection figure ZS is located outside the opening projection figure ZG means that the bearing hole 43H of the rear planetary gear 43 is moved even if the reference gear assembly 93A is translated toward the shaft assembly 92. It can be said that the shaft rear surface tip portion 41T of the planetary shaft main body 41 is not inserted.

  On the other hand, when the shaft assembly 92 and the reference gear assembly 93A are in a compatible relationship, the tip projection graphic ZS (first tip projection graphic ZS1) is entirely the opening projection graphic ZG (first opening projection graphic ZG1). Located inside. That is, the state in which the tip projection graphic ZS is entirely located inside the opening projection graphic ZG means that the planetary shaft is inserted into the bearing hole 43H of the rear planetary gear 43 by translating the gear assembly 93 toward the shaft assembly 92. It can be said that the shaft back end portion 41T of the main body 41 is inserted.

  Therefore, in order to satisfy the above [Condition 3], the state of the reference gear assembly 93A with respect to the shaft assembly 92 is set so that the entire second tip projection graphic ZS2 is positioned inside the opening projection graphic ZG. It can be said that it should be changed. That is, it is possible to obtain a correction relationship by matching the position of the back planetary gear 43 with the second opening projection figure ZG2 so that the second opening projection figure ZG2 is obtained as the opening projection figure ZG. .

  Here, the displacement direction of the second tip projection graphic ZS2 relative to the first tip projection graphic ZS1 is the tip surface displacement direction TD, and the displacement amount of the second tip projection graphic ZS2 relative to the first tip projection graphic ZS1 is the tip surface. When the displacement amount TL is set, the second opening projection graphic ZG2 is obtained by reflecting the tip surface displacement direction TD and the tip surface displacement amount TL on the first opening projection graphic ZG1. That is, the second opening projection graphic ZG2 corresponds to a graphic obtained by moving the first opening projection graphic ZG1 on the reference plane P by the front end surface displacement amount TL in the front end surface displacement direction TD.

  Therefore, by reflecting the front end surface displacement direction TD and the front end surface displacement amount TL on each rear planetary gear 43 of the reference gear assembly 93A, the opposite axis state of the reference gear assembly 93A in an inappropriate relationship is changed, thereby correcting the relationship. Be able to get. That is, by changing at least one of the inter-gear position and the gear rotation phase of the reference gear assembly 93A according to the front end surface displacement direction TD and the front end surface displacement amount TL, the tilt matching state is set as the opposite axis state of the reference gear assembly 93A. Be able to get.

  When the shaft assembly 92 and the reference gear assembly 93A are in a correction relationship, the tip projection graphic ZS (second tip projection graphic ZS2) is entirely inside the aperture projection graphic ZG (second opening projection graphic ZG2). To position. Therefore, when the gear assembly 93 is translated toward the shaft assembly 92, the shaft rear surface tip portion 41 </ b> T of the planetary shaft main body 41 is inserted into the bearing hole 43 </ b> H of the rear planetary gear 43.

  When [Condition 1] to [Condition 3] are satisfied before assembling the main assembly 94, when at least one of the planetary shaft bodies 41 in the shaft assembly 92 is inclined with respect to the main body reference posture. However, the shaft assembly 92 and the reference gear assembly 93A can be combined as follows.

  When the reference gear assembly 93A is moved toward the shaft assembly 92 in a state where the above [Condition 1] to [Condition 3] are satisfied, the shaft rear end of the planetary shaft main body 41 is inserted into the bearing hole 43H of the rear planetary gear 43. Part 41T is inserted. When the reference gear assembly 93A is further pushed toward the shaft assembly 92 from this state, the planetary shaft main body 41 and the rear planetary gear 43 are centered on each other due to the contact between the shaft rear tip 41T and the rear planetary gear 43. In order to change the posture in a direction to absorb the deviation, the rear side shaft 41R is continuously inserted into the bearing hole 43H. Then, due to the change in the posture of the planetary shaft main body 41 and the rear planetary gear 43, the insertion of the rear shaft 41R into the bearing hole 43H is allowed until the planetary front end surface 43F of the rear planetary gear 43 contacts the planetary shaft main body 41. Therefore, the shaft assembly 92 and the reference gear assembly 93A can be appropriately combined.

[2] “Details of manufacturing method”
With reference to FIGS. 13-32, the detail of the manufacturing method of the rotation linear motion conversion mechanism 1 is demonstrated. In the manufacturing method of this embodiment, the rotation linear motion conversion mechanism 1 is manufactured including the following process A to process Q. In addition, the rotation linear motion conversion mechanism 1 provided with the nine planetary shafts 4 is assumed here.

  [Step A (FIG. 13)] The ring shaft main body 21, the sun shaft main body 31, the planetary shaft main body 41, the front ring gear 22, the rear ring gear 23, the rear sun gear 33, and the rear planetary gear 43 are cleaned.

[Step B (FIG. 14)] The sunshaft body 31 is attached to the first jig 61.
The structure of the first jig 61 will be described with reference to FIG.
FIG. 15A shows a planar structure of the first jig 61.
FIG. 15B shows a cross-sectional structure of the first jig 61 along the DE-DE line.

  The first jig 61 is configured so that the posture of the sunshaft body 31 relative to the jig can be fixed in a state where the sunshaft body 31 is inserted into the bearing hole 61H. Further, in a state where the sun shaft main body 31 is fixed, the position of each planetary shaft main body 41 in the axial direction with respect to the sun shaft main body 31 is obtained by bringing the shaft front end surface 41G of each planetary shaft main body 41 into contact with the end surface of the jig. Can be set to the axial reference relative position. The axial reference relative position is determined by meshing the front sun gear 32 with each front planetary gear 42 when the planetary shaft main body 41 in the main body reference posture is translated toward the sun shaft main body 31, and the sun screw 34 and each This corresponds to a position where meshing with the planetary screw 44 is obtained.

  [Step C (FIG. 16)] An assembly (base assembly 91) constituted by a combination of the sun shaft main body 31 and each planetary shaft main body 41 is assembled. That is, the base assembly 91 is assembled by meshing the front sun gear 32 and the sun screw 34 of the sun shaft main body 31 with the front planetary gear 42 and the planetary screw 44 of each planetary shaft main body 41.

In step C, specifically, the base assembly 91 in the first reference assembly state (reference base assembly 91A) is assembled through the following operations (a) to (d).
(A): Each planetary shaft main body 41 is maintained in a state in which each center line is parallel to the center line of the sun shaft main body 31 in a state of being spaced apart from the sun shaft main body 31 in the radial direction. To do. That is, the posture of each planetary shaft main body 41 is set to the main body reference posture.
(B): The shaft front end surface 41G of each planetary shaft main body 41 is brought into contact with the end surface of the first jig 61, whereby the position of each planetary shaft main body 41 in the axial direction with respect to the sun shaft main body 31 is determined as the axial reference relative position. Set to.
(C): The positions of the planetary shaft bodies 41 in the circumferential direction with respect to the sunshaft body 31 are set so that the planetary shaft bodies 41 are arranged at equal intervals around the sunshaft body 31.
(D): Each planetary shaft main body 41 and the sun shaft main body 31 are combined in a radial direction toward the sun shaft main body 31 in a state in which each planetary shaft main body 41 is held in the main body reference posture, so that the reference base is combined. Assemble assembly 91A.

  [Step D (FIG. 17)] As part of the work for grasping the position of the shaft back end surface 41S of each planetary shaft main body 41 in the shaft assembly 92, each planetary shaft main body 41 of the reference base assembly 91A is passed through the laser displacement meter 7. The shaft back end surface 41S is irradiated with laser light. Then, the measurement value obtained through the laser light irradiation is stored as the first measurement value RA.

  Here, in the laser displacement meter 7, a portion that emits laser light is defined as a laser emitting portion, and the position of the laser displacement meter 7 with respect to the planetary shaft main body 41, that is, the position of the laser emitting portion with respect to the planetary shaft main body 41 is defined as a measurement position. In addition, a measurement position where the laser emitting unit is disposed at a position after a predetermined distance from the planetary shaft main body 41 is set as a reference measurement position.

In the process D, specifically, the first measurement value RA is acquired through the following operations (a) to (c).
(A): The measurement position of the laser displacement meter 7 with respect to the reference base assembly 91A is set as the reference measurement position.
(B): A measured value obtained by irradiating laser light from the laser displacement meter 7 to the shaft back end surface 41S of the planetary shaft main body 41 is stored in the arithmetic unit as a first measured value RA.
(C): The operations (a) and (b) are performed on all the planetary shaft bodies 41. That is, the first measurement value RA is acquired for each planetary shaft body 41.

[Step E (FIG. 18)] The jig attached to the reference base assembly 91A is changed from the first jig 61 to the second jig 62.
The structure of the second jig 62 will be described with reference to FIG.
FIG. 19A shows a planar structure of the second jig 62.
FIG. 19B shows a cross-sectional structure of the second jig 62 along the DF-DF line.

  The second jig 62 includes a sun jig 63 for fixing the sun shaft main body 31 and a planetary jig 64 for supporting the front side shaft 41F of the planetary shaft main body 41. That is, the same number of planetary jigs 64 as the number of planetary shafts 4 provided in the rotary linear motion conversion mechanism 1 are formed integrally with the sun jig 63.

  The sun jig 63 is configured such that its center line (center line of the bearing hole 63H) is aligned with the center line of the sun shaft body 31 in a state where the sun shaft body 31 is inserted into the bearing hole 63H. Each planetary jig 64 is configured such that the center lines thereof are equally spaced around the center line of the bearing hole 63H. The sun jig 63 and the planetary jigs 64 are configured such that their center lines are parallel to each other. A hole (support hole 64H) corresponding to the shape of the front side shaft 41F of the planetary shaft body 41 is formed at the tip of each planetary jig 64.

In step E, specifically, the second jig 62 is attached to the reference base assembly 91A through the following operations (a) to (c).
(A): The first jig 61 is removed from the reference base assembly 91A while the reference base assembly 91A is held by a separate jig.
(B): The second jig is located at a position where the center line of the second jig 62 and the center line of the sun shaft main body 31 are aligned, and the center line of the planetary jig 64 and the center line of the planetary shaft main body 41 are aligned. A tool 62 is arranged.
(C): The second jig 62 is attached to the reference base assembly 91A by moving toward the sunshaft body 31. That is, the sun shaft main body 31 is inserted into the bearing hole 63H, and the front shaft 41F of each planetary shaft main body 41 is fitted into the support hole 64H of the corresponding planetary jig 64.

[Step F (FIG. 20)] A retainer 65 is mounted on each planetary shaft body 41 of the reference base assembly 91A.
The structure of the retainer 65 will be described with reference to FIG.
FIG. 21A shows a planar structure of the retainer 65.
FIG. 21B shows a cross-sectional structure of the retainer 65 along the line DG-DG.

  The retainer 65 is configured as a jig for collectively supporting the rear side shaft 41R of each planetary shaft main body 41. That is, the retainer 65 is formed with a sun bearing hole 65S for inserting the sun shaft main body 31 and a plurality of planetary bearing holes 65P for inserting the back side shaft 41R.

  The sun bearing hole 65 </ b> S is formed so that its own center line is aligned with the center line of the sun shaft main body 31 in a state where the retainer 65 is mounted on the base assembly 91. Each planetary bearing hole 65P is formed such that its center line is located at equal intervals around the center line of the sun bearing hole 65S. The sun bearing holes 65S and the planetary bearing holes 65P are formed such that their center lines are parallel to each other.

In step F, specifically, the retainer 65 is attached to the reference base assembly 91A through the following operations (a) and (b).
(A): The retainer 65 is disposed at a position where the center line of each planetary bearing hole 65P and the centerline of each planetary jig 64 are aligned.
(B): The retainer 65 is attached to the reference base assembly 91A by moving toward the reference base assembly 91A. That is, the back side shaft 41R of each planetary shaft body 41 is inserted into each planetary bearing hole 65P of the retainer 65.

[Step G (FIG. 22)] The front ring gear 22 is assembled to the reference base assembly 91A. Specifically, the front ring gear 22 is assembled through the following operations (a) and (b).
(A): The front ring gear 22 is arranged at a position where the center line of the sun shaft main body 31 and the center line of the sun shaft main body 31 are aligned on the back side of the reference base assembly 91A.
(B): Each front planetary gear 42 of the reference base assembly 91A and the front ring are moved by moving the front ring gear 22 toward the reference base assembly 91A in a state where the front ring gear 22 is held in the posture set through the operation (a). Engage with the gear 22.

  [Step H (FIG. 23)] An assembly (shaft assembly 92) constituted by a combination of the base assembly 91 and the ring shaft main body 21 is assembled. That is, the shaft assembly 92 is assembled by meshing each planetary screw 44 of the base assembly 91 with the annular screw 24 of the ring shaft main body 21.

In the process H, specifically, the shaft assembly 92 is assembled through the following operations (a) to (d).
(A): The ring shaft main body 21 is arranged at a position where the center line of the sun shaft main body 31 and the center line of the sun shaft main body 31 are aligned on the back side of the reference base assembly 91A.
(B): The planetary screw 44 and the annular screw 24 of the base assembly 91 are moved by moving the ring shaft main body 21 toward the reference base assembly 91A in a state where the ring shaft main body 21 is held in the posture set through the operation (a). And bite.
(C): Screw the ring shaft main body 21 until the axial position of the ring shaft main body 21 with respect to the sun shaft main body 31 reaches a predetermined position.
(D): The front ring gear 22 is fixed to the ring shaft main body 21 by press-fitting into the main body gear portion 21B.

  [Step I (FIG. 24)] In the shaft assembly 92, as a part of the operation for obtaining the state in which each planetary shaft main body 41 can change the posture with respect to the ring shaft main body 21 and the sun shaft main body 31, Remove the retainer 65 from 92.

  [Step J (FIG. 25)] An axial load is applied to each planetary shaft body 41 of the shaft assembly 92 by the second jig 62. That is, by pushing each planetary shaft main body 41 to the back side through each planetary jig 64, a constant load is applied to each planetary shaft main body 41 from the front side to the back side.

In Step J, specifically, a load is applied to the planetary shaft main body 41 through the following operations (a) and (b).
(A): Release the fixation of the sunshaft body 31 by the second jig 62 so that the second jig 62 can be moved in the axial direction with respect to the sunshaft body 31.
(B): A load in the axial direction is applied to each planetary shaft main body 41 of the shaft assembly 92 through each planetary jig 64 by pushing the second jig 62 toward the back direction RR.

[Step K (FIG. 26)] In the shaft assembly 92, as part of the operation for obtaining the state in which each planetary shaft main body 41 can change the posture with respect to the ring shaft main body 21 and the sunshaft main body 31, the shaft assembly 92. The jig attached to 92 is changed from the second jig 62 to the first jig 61. Specifically, the jig is changed through the following operations (a) to (c).
(A): The second jig 62 is removed from the shaft assembly 92 with the shaft assembly 92 held by a separate jig.
(B): The first jig 61 is arranged at a position where the center line of the first jig 61 and the center line of the sun shaft main body 31 are aligned.
(C): The first jig 61 is attached to the shaft assembly 92 by moving it toward the shaft assembly 92.

  [Step L (FIG. 27)] As part of the work for grasping the position of the shaft back end surface 41S of each planetary shaft main body 41 in the shaft assembly 92, the shaft of each planetary shaft main body 41 of the shaft assembly 92 through the laser displacement meter 7 is used. The back end face 41S is irradiated with laser light. Then, the measurement value obtained through the laser beam irradiation is stored as the second measurement value RB.

In the process L, specifically, the second measurement value RB is acquired through the following operations (a) to (c).
(A): The measurement position of the laser displacement meter 7 with respect to the shaft assembly 92 is set as a reference measurement position.
(B): A measured value obtained by irradiating laser light from the laser displacement meter 7 to the shaft back end surface 41S of the planetary shaft main body 41 is stored in the arithmetic unit as the second measured value RB.
(C): The operations (a) and (b) are performed on all the planetary shaft bodies 41. That is, the second measurement value RB is acquired for each planetary shaft main body 41.

  [Step M (FIG. 28)] An assembly (gear assembly 93) constituted by a combination of the rear ring gear 23, the rear sun gear 33, and each rear planetary gear 43 is assembled. In Step M, the gear assembly 93 is assembled by attaching the rear ring gear 23, the rear sun gear 33, and the respective rear planetary gears 43 to the gear jig 66. The gear jig 66 is a jig that can assemble the gear assembly 93 by attaching each gear to a portion formed on the jig corresponding to the rear ring gear 23, the rear sun gear 33, and the rear planetary gear 43. It is configured.

In the process M, specifically, the gear assembly 93 is assembled through the following operations (a) to (c).
(A): The rear ring gear 23 is attached to the gear jig 66.
(B): The rear sun gear 33 is attached to the gear jig 66.
(C): After the above operations (a) and (b), the back ring gear 23 and the back sun gear 33 are engaged with the back planetary gears 43 by attaching the back planetary gears 43 to the gear jig 66. .

[Step N (FIG. 29)] The gear assembly 93 is attached to the adjustment jig 8.
The adjustment jig 8 is configured as a jig that can change the inter-gear position and the gear rotation phase of the gear assembly 93. Specifically, a phase adjustment jig 81 that can change the gear rotation phase while maintaining the relationship among the rear ring gear 23, the rear sun gear 33, and each rear planetary gear 43 in the gear assembly 93, and the rear planetary gear. Position adjusting jig 82 capable of changing the position between the gears in a state in which the center line of 43 is parallel to the center line of rear sun gear 33, and an actuator for driving these phase adjusting jig 81 and position adjusting jig 82 And is configured. The laser displacement meter 7 and the adjustment jig 8 are associated with each other so that the actuator of the adjustment jig 8 is driven based on the calculation result of the calculation device of the laser displacement meter 7.

  Here, the position of the adjustment jig 8 with respect to the shaft assembly 92 is defined as a jig position, the operation state of the phase adjustment jig 81 is defined as a first operation state, and the operation state of the position adjustment jig 82 is defined as a second operation state. The jig position is a specified position (initial jig position), the first operation state is a specified operation state (initial first operation state), and the second operation state is a specified operation state (initial second operation state). The state of the adjustment jig 8 at that time is the jig initial state.

  The adjustment jig 8 is configured so that the reference gear assembly 93A can be held in the reference conforming state when the jig is in the initial state. Accordingly, when the reference gear assembly 93A is attached to the adjustment jig 8 in the jig initial state, the shaft assembly 92 and the gear assembly 93 are combined by moving the adjustment jig 8 toward the reference shaft assembly 92A. Can do.

In step N, specifically, the gear assembly 93 is attached to the adjustment jig 8 through the following operations (a) to (c).
(A): The state of the adjustment jig 8 is set to the jig initial state.
(B): The gear assembly 93 is removed from the gear jig 66.
(C): The gear assembly 93 is attached to the adjustment jig 8. That is, the rear ring gear 23 and the rear sun gear 33 of the gear assembly 93 are held by the phase adjustment jig 81, and the respective rear planetary gears 43 of the gear assembly 93 are held by the position adjustment jig 82.

  [Step O (FIG. 30)] With respect to the reference gear assembly 93A of the adjusting jig 8, the front surface displacement direction TD and the front surface displacement amount TL calculated through the arithmetic unit of the laser displacement meter 7 are used as the back surface planetary of the gear assembly 93. This is reflected in the gear 43. That is, the position between the gears of the reference gear assembly 93A is changed from the position between the reference compatible gears to the position between the inclined compatible gears so that the state (opposite shaft state) of the reference gear assembly 93A with respect to the shaft assembly 92 becomes the inclination compatible state. The gear rotation phase is changed from the reference compatible gear rotation phase to the tilt compatible gear rotation phase.

The tip surface displacement direction TD and the tip surface displacement amount TL can be calculated through, for example, the following processes (A) to (D).
(A): The position of the first tip projection graphic ZS1 on the reference plane P is specified based on the first measurement value RA. That is, the coordinates of the center point (first reference point P1) of the first tip projection graphic ZS1 are specified.
(B): The position of the second tip projection graphic ZS2 on the reference plane P is specified based on the second measurement value RB. That is, the coordinates of the center point (second reference point P2) of the second tip projection graphic ZS2 are specified.
(C): Based on the position of the first tip projection graphic ZS1 and the position of the second tip projection graphic ZS2, the tip surface displacement direction TD and the tip surface displacement amount TL are calculated. That is, the tip surface displacement direction TD and the tip surface displacement amount TL are calculated based on the coordinates of the first reference point P1 and the coordinates of the second reference point P2.
(D): Control amounts of the phase adjustment jig 81 and the position adjustment jig 82 necessary for reflecting the front end surface displacement direction TD and the front end surface displacement amount TL with respect to each rear planetary gear 43 of the gear assembly 93. calculate. That is, it is necessary to set the inter-gear position and the gear rotation phase of the gear assembly 93 to the inclination-adapted inter-gear position and the inclination-adapted gear rotation phase so that the opening projection figure ZG is aligned with the second opening projection figure ZG2. The control amounts of the phase adjustment jig 81 and the position adjustment jig 82 are calculated.

In step O, specifically, the counter gear state of the reference gear assembly 93A is changed from the reference conforming state to the tilt conforming state through the following operations (a) and (b).
(A): When the control amount of the phase adjustment jig 81 is set through the arithmetic unit, that is, when the command for driving the phase adjustment jig 81 is given to the actuator of the adjustment jig 8, the phase adjustment jig The gear rotation phase is changed by the tool 81 from the gear rotation phase (reference compatible gear rotation phase) in the matching relationship to the gear rotation phase (inclination matching gear rotation phase) in the correction relationship. At this time, the gear rotation phase is changed in a state where the position between the gears is maintained by the cooperation of the phase adjustment jig 81 and the position adjustment jig 82.
(B): When the control amount of the position adjusting jig 82 is set through the arithmetic unit, that is, when the command for driving the position adjusting jig 82 is given to the actuator of the adjusting jig 8, By means of the tool 82, the inter-gear position is changed from the inter-gear position in the matching relationship (reference inter-fit gear position) to the inter-gear position in the correction relationship (inclination matching inter-gear position).

  [Step P (FIG. 31)] An assembly (main assembly 94) constituted by a combination of the shaft assembly 92 and the gear assembly 93 is assembled. That is, the main assembly 94 is assembled by assembling the reference gear assembly 93 </ b> A in a state of fitting to the shaft assembly 92. In the present embodiment, the main assembly 94 corresponds to an assembly with gears.

Specifically, in the process P, the main assembly 94 is assembled through the following operations (a) to (c).
(A): The reference gear assembly 93 </ b> A is assembled to the shaft assembly 92 through the movement of the adjustment jig 8.
(B): After the rear ring gear 23 is fitted to the main body gear portion 21 </ b> C of the ring shaft main body 21, the rear ring gear 23 is press-fitted into the ring shaft main body 21.
(C): After the rear sun gear 33 is fitted to the main body gear portion 31 </ b> C of the sun shaft main body 31, the rear sun gear 33 is press-fitted into the sun shaft main body 31.

  [Step Q (FIG. 32)] An assembly (rotational linear motion conversion mechanism 1) constituted by a combination of the main assembly 94 and the front collar 51 and the rear collar 52 is assembled. That is, the rotary linear motion conversion mechanism 1 is assembled by assembling the front collar 51 and the rear collar 52 to the main assembly 94.

In the process Q, specifically, the rotary linear motion conversion mechanism 1 is assembled through the following operations (a) and (b).
(A): After attaching the O-ring 53 to the front collar 51, the front collar 51 is attached to the body gear portion 21B of the ring shaft body 21.
(B): After attaching the O-ring 53 to the back collar 52, the back collar 52 is attached to the body gear portion 21 </ b> C of the ring shaft body 21.

<Effect of embodiment>
As described above in detail, according to the manufacturing method of the rotational linear motion conversion mechanism according to this embodiment, the following effects can be obtained.

  (1) In the manufacturing method of the present embodiment, the main assembly 94 is assembled by combining the shaft assembly 92 and the reference gear assembly 93A that is in an inclined state. As a result, even when the assembled state of the shaft assembly 92 is the inclined assembled state, the shaft assembly 92 and the gear assembly 93 are accurately combined, so that the shaft assembly 92 and the gear are caused by the inclination of the planetary shaft main body 41. It is possible to prevent the assembly work with the assembly 93 from being interrupted. In addition, the productivity of the rotary linear motion conversion mechanism 1 can be improved.

  (2) When acquiring the first measurement value RA and the second measurement value RB, the laser displacement meter 7 is arranged at a common measurement position (reference measurement position). On the other hand, the acquisition of the second measurement value RB is basically performed for the planetary shaft main body 41 tilted with respect to the main body reference posture, so that depending on the posture of each planetary shaft main body 41 in the shaft assembly 92, the laser It is also assumed that the light receiving element of the displacement meter 7 cannot accurately receive the laser beam reflected on the shaft back end surface 41S.

  Therefore, in order to more appropriately acquire the first measurement value RA and the second measurement value RB, the attitude of the planetary shaft body 41 when acquiring the first measurement value RA and the planetary shaft body when acquiring the second measurement value RB. It is conceivable to set the reference measurement position in consideration of 41 postures. However, since the attitude of the planetary shaft main body 41 of the shaft assembly 92 differs each time the shaft assembly 92 is assembled due to the difference in the meshing state of the screws when the reference base assembly 91A and the ring shaft main body 21 are combined, the second measured value It is difficult to grasp in advance the attitude of the planetary shaft main body 41 at the time of acquiring the RB. Since the first measurement value RA is a value obtained by measuring the planetary shaft body 41 of the reference base assembly 91A as a measurement target, the attitude of the planetary shaft body 41 at the time of obtaining the first measurement value RA can be grasped in advance. it can.

  Therefore, in the manufacturing method of the present embodiment, by performing an operation of applying a load to each planetary shaft body 41 of the shaft assembly 92 before obtaining the second measurement value RB, the second measurement value RB The posture of each planetary shaft main body 41 at the time of acquisition can be grasped in advance. By the way, when a load having the same direction and the same magnitude is applied to each planetary shaft main body 41, each planetary shaft main body 41 is tilted by substantially the same amount with respect to the sunshaft main body 31 in substantially the same direction. Become. Moreover, if the direction and magnitude | size of the load provided to each planetary shaft main body 41 are the same, each planetary shaft main body 41 after giving a load will be irrespective of the attitude | position of each planetary shaft main body 41 before giving a load. Each time the posture is substantially the same every time a load is applied. Therefore, each planetary shaft at the time of acquisition of the second measurement value RB through a prior test is adopted by adopting a manufacturing method in which a load is applied to each planetary shaft body 41 before acquisition of the second measurement value RB. The posture of the main body 41 can be grasped in advance.

  By adopting such a configuration, the reference measurement position is set in consideration of the posture of each planetary shaft main body 41 at the time of obtaining the first measurement value RA and the posture of each planetary shaft main body 41 at the time of obtaining the second measurement value RB. Therefore, the first measurement value RA and the second measurement value RB can be appropriately acquired. In the manufacturing method according to the present embodiment, the first measurement value RA and the second measurement value RB are acquired based on the reference measurement position set through the above-described aspect, and therefore the tip surface displacement direction TD and the tip surface displacement amount TL. It is possible to improve the accuracy of the calculation. In addition, the inter-gear position and the gear rotation phase of the reference gear assembly 93A can be changed more accurately.

(Other embodiments)
The present invention can be carried out in the following modes in addition to the above-described embodiment.
In the above-described embodiment, the configuration in which the tip surface displacement direction TD and the tip surface displacement amount TL are calculated through the processes (A) to (D) in step O is adopted. However, the tip surface displacement direction TD and the tip surface displacement amount TL are employed. The calculation mode can be changed to a calculation mode including the following (A) to (C).
(A): The relationship between the difference between the first measurement value RA and the second measurement value RB, the tip surface displacement direction TD, and the tip surface displacement amount TL is grasped in advance by a test or the like and stored in the arithmetic unit.
(B): When the main assembly 94 is assembled, the first measurement value RA and the second measurement value RB are acquired through the laser displacement meter 7.
(C): Applying the acquired first measurement value RA and second measurement value RB to the relationship stored in the arithmetic device to calculate the tip surface displacement direction TD and the tip surface displacement amount TL.

  In the above-described embodiment, the configuration in which the tip surface displacement direction TD and the tip surface displacement amount TL are calculated based on the first measurement value RA and the second measurement value RB by the laser displacement meter 7 is employed. The tip surface displacement direction TD and the tip surface displacement amount TL can also be calculated. Examples of a method for grasping the tip surface displacement direction TD and the tip surface displacement amount TL by other measurement devices include a method using an image processing device. In this case, after the image of each shaft back end surface 41S of the reference base assembly 91A and the image of each shaft back end surface 41S of the shaft assembly 92 are taken into the image processing apparatus, the front end surface displacement direction TD and the front end are based on the comparison of these images. The surface displacement amount TL can be calculated.

In the above-described embodiment, the first measurement value RA and the second measurement value RB are acquired through the laser displacement meter 7 every time the main assembly 94 is assembled, and the tip is based on the first measurement value RA and the second measurement value RB. Although the configuration for calculating the surface displacement direction TD and the tip surface displacement amount TL is adopted, the calculation mode of the tip surface displacement direction TD and the tip surface displacement amount TL includes the following (A) to (D). It can also be changed to a mode.
(A): The first tip projection graphic ZS1 at the time of assembling the main assembly 94 is grasped in advance by a test or the like and stored in the arithmetic unit. By the way, the first tip portion stored in the arithmetic unit is configured so that the position of the jig for holding the shaft assembly 92 and the mounting state of the shaft assembly 92 with respect to the jig are the same every time the main assembly 94 is assembled. The projected figure ZS1 and the first tip projection figure ZS1 in the actual assembly process are matched.
(B): When the main assembly 94 is assembled, the second measured value RB (reference measured value) is acquired through the laser displacement meter 7.
(C): The position of the second tip projection graphic ZS2 on the reference plane P is specified based on the second measurement value RB. That is, the coordinates of the center point (second reference point P2) of the second tip projection graphic ZS2 are specified.
(D): Based on the position of the first tip projection graphic ZS1 and the position of the second tip projection ZS2, the tip surface displacement direction TD and the tip surface displacement amount TL are calculated. That is, the tip surface displacement direction TD and the tip surface displacement amount TL are calculated based on the coordinates of the first reference point P1 and the coordinates of the second reference point P2.

  The calculation mode of the front end surface displacement direction TD and the front end surface displacement amount TL is not limited to the calculation mode illustrated in the above embodiment and other embodiments, and can be changed as appropriate. In short, an appropriate calculation mode can be adopted as long as the tip surface displacement direction TD and the tip surface displacement amount TL can be calculated as values indicating the degree of inclination of the planetary shaft body 41 with respect to the main body reference posture. In addition, the effect according to the effect of the said embodiment can be show | played also by the structure of other embodiment illustrated above.

  -The rotation linear motion conversion mechanism used as the application object of this invention is not restricted to the rotation linear motion conversion mechanism of the structure illustrated in the said embodiment. In short, an annular shaft is constituted by a combination of an annular shaft main body and an annular gear, a solar axis is constituted by a combination of the solar shaft main body and the sun gear, and the planetary shaft main body and the planetary gear are The present invention can be applied to the manufacturing method of any rotational linear motion conversion mechanism that requires a planetary shaft to be configured by a combination.

The perspective view which shows the perspective structure of a rotation linear motion conversion mechanism about embodiment which actualized the manufacturing method of the rotation linear motion conversion mechanism concerning this invention. The perspective view which shows the internal structure about the rotation linear motion conversion mechanism of the embodiment. (A) The front view which shows the front structure about the ring shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (B) The top view which shows the planar structure about the ring shaft. (A) Sectional drawing which shows the cross-section along the DA-DA line | wire of FIG. 3 (B) about the ring shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (B) Sectional drawing which shows the cross-section of the state which decomposed | disassembled the part about the ring shaft. (A) The front view which shows the front structure about the sun shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (B) The front view which shows the front structure of the state which decomposed | disassembled about the sun shaft. (A) The front view which shows the front structure about the planetary shaft which comprises the rotation linear motion conversion mechanism of the embodiment. (B) The front view which shows the front structure of the state which decomposed | disassembled one part about the planetary shaft. (C) Sectional drawing which shows the cross-sectional structure along the centerline about the back planetary gear which comprises the planetary shaft. Sectional drawing which shows the cross-section along the centerline about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-section along the DB-DB line | wire of FIG. 7 about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-sectional structure along the DC-DC line | wire of FIG. 7 about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-section along the DD-DD line of FIG. 7 about the rotation linear motion conversion mechanism of the embodiment. The schematic diagram which shows the relationship between a shaft assembly and a gear assembly, and a reference plane. The schematic diagram which shows the relationship between the front-end | tip part projection figure and opening part projection figure in a reference plane. Process drawing which shows the operation | work aspect in process A about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process B about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. (A) The top view which shows the planar structure about the 1st jig | tool used in the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. (B) Sectional drawing which shows the cross-section along the DE-DE line | wire of FIG. 15 (A) about the 1st jig | tool. Process drawing which shows the operation | work aspect in process C about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process D about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process E about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. (A) The top view which shows the planar structure about the 2nd jig | tool used in the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. (B) Sectional drawing which shows the cross-section along the DF-DF line | wire of FIG. 19 (A) about the 2nd jig | tool. Process drawing which shows the operation | work aspect in the process F about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. (A) The top view which shows the planar structure about the retainer used in the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. (B) Sectional drawing which shows the cross-sectional structure along the DG-DG line | wire of FIG. 21 (A) about the retainer. Process drawing which shows the operation | work aspect in the process G about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process H about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process I about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process J about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in the process K about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in the process L about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in the process M about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process N about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process O about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process P about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment. Process drawing which shows the operation | work aspect in process Q about the manufacturing method of the rotation linear motion conversion mechanism of the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary linear motion conversion mechanism, 2 ... Ring shaft, 21 ... Ring shaft main body, 21A ... Main body screw part, 21B ... Main body gear part, 21C ... Main body gear part, 22 ... Front ring gear, 23 ... Rear ring gear, 24 ... ring screw, 3 ... sun shaft, 31 ... sun shaft main body, 31A ... main body screw portion, 31B ... main body gear portion, 31C ... main body gear portion, 31D ... main body tip portion, 32 ... front sun gear, 33 ... rear sun gear, 34 ... Sun screw, 4 ... Planetary shaft, 41 ... Planetary shaft main body, 41A ... Main body screw portion, 41B ... Main body gear portion, 41F ... Front shaft, 41R ... Rear shaft, 41G ... Shaft front end surface, 41S ... Shaft back End surface, 41H ... Front end of shaft, 41T ... Front end of shaft, 42 ... Front planetary gear, 43 ... Rear planetary gear 43F ... Planetary front end face, 43H ... Bearing hole, 43I ... Bearing opening, 44 ... Planetary screw, 51 ... Front collar, 51A ... Bearing, 51H ... Oil hole, 52 ... Rear collar, 52A ... Bearing, 53 ... O-ring, 61 ... first jig, 61H ... bearing hole, 62 ... second jig, 63 ... sun jig, 63H ... insertion hole, 64 ... planet jig, 64H ... support hole, 65 ... retainer, 65S ... sun bearing hole , 65P ... planetary bearing hole, 66 ... gear jig, 7 ... laser displacement meter, 8 ... adjustment jig, 81 ... phase adjustment jig, 82 ... position adjustment jig, 91 ... base assembly, 92 ... shaft assembly, 93 ... gear assembly, 94 ... main assembly.

Claims (13)

An annular shaft having a space extending in the axial direction, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear;
The sun shaft is configured to include a sun shaft body having a sun screw formed as a male screw and a sun gear formed as an external gear.
The planetary shaft includes a planetary shaft body having a planetary screw formed as a male screw and a planetary gear formed as an external gear;
The annular gear is formed separately from the annular shaft body;
The sun gear is formed separately from the sun shaft body;
The planetary gear is formed separately from the planetary shaft body;
The annular screw and the sun screw mesh with the planetary screw;
The annular gear and the sun gear mesh with the planetary gear,
And a rotational linear motion conversion mechanism configured such that the other of the annular axis and the sun axis linearly moves through the planetary motion of the planetary axis accompanying the rotational motion of one of the annular axis and the sun axis. In the manufacturing method of
The rotational linear motion conversion mechanism is manufactured including the following steps: `` An assembly composed of a combination of the annular shaft main body, the sun shaft main body, and the planetary shaft main body is defined as an axis aggregate, and the shaft First step of assembling the assembly "
“Second step of assembling the gear assembly by setting the aggregate composed of a combination of the annular gear, the sun gear, and the planetary gear”
“Regarding the attitude of the planetary shaft main body, the attitude of the axis assembly assembled in the first step is defined as a main body reference attitude in which the centerline of the planetary axis main body is parallel to the centerline of the solar axis main body. The third step of measuring the degree of inclination of the planetary shaft main body with respect to the main body reference posture "
“The relationship between the shaft assembly and the gear assembly is based on the relationship in which the shaft assembly assembled in the first step and the gear assembly assembled in the second step can be combined. As the relationship, the relationship between the shaft assembly and the gear assembly is changed to the reference relationship by changing the state of the gear assembly with respect to the shaft assembly based on the degree of inclination measured in the third step. 4th process to change to "
“Fifth step of assembling the geared assembly after passing through the fourth step, with the assembly formed by the combination of the shaft assembly and the gear assembly as a geared assembly”
A method of manufacturing a rotating linear motion conversion mechanism. An annular shaft having a space extending in the axial direction, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear;
The sun shaft is configured to include a sun shaft body having a sun screw formed as a male screw and a sun gear formed as an external gear.
The planetary shaft includes a planetary shaft body having a planetary screw formed as a male screw and a planetary gear formed as an external gear;
The annular gear is formed separately from the annular shaft body;
The sun gear is formed separately from the sun shaft body;
The planetary gear is formed separately from the planetary shaft body;
The annular screw and the sun screw mesh with the planetary screw;
The annular gear and the sun gear mesh with the planetary gear,
And a rotational linear motion conversion mechanism configured such that the other of the annular axis and the sun axis linearly moves through the planetary motion of the planetary axis accompanying the rotational motion of one of the annular axis and the sun axis. In the manufacturing method of
The rotational linear motion conversion mechanism is manufactured including the following steps: `` An assembly composed of a combination of the annular shaft main body, the sun shaft main body, and the planetary shaft main body is defined as an axis aggregate, and the shaft First step of assembling the assembly "
“Second step of assembling the gear assembly by using an assembly composed of a combination of the annular gear, the sun gear, and the planetary gear as a gear assembly”
“The planetary shaft of the shaft assembly assembled in the first step with the posture of the planetary shaft main body in which the centerline of the planetary shaft main body is parallel to the centerline of the solar shaft main body as a main body reference posture. The third step of measuring the inclination of the main body relative to the main body reference posture "
“Assembly state of the annular shaft main body and the sun shaft main body and the planetary shaft main body in the shaft assembly, the assembled state when the posture of the planetary shaft main body is inclined with respect to the main body reference posture The assembly state that can be combined with the shaft assembly in the inclined assembly state with respect to the assembly state of the annular gear and the sun gear and the planetary gear in the gear assembly. As the specific assembly state, the assembly state of the gear assembly assembled in the second step is changed to the specific assembly state based on the degree of inclination of the planetary shaft body measured in the third step. 4 steps "
“Fifth step of assembling the geared assembly after passing through the fourth step, with the assembly formed by the combination of the shaft assembly and the gear assembly as a geared assembly”
A method of manufacturing a rotating linear motion conversion mechanism. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 2,
In the second step, with respect to the assembled state of the annular gear and the sun gear and the planetary gear in the gear assembly, a centerline of the annular gear and the sun gear and a centerline of the planetary gear are An assembly state parallel to each other is set as a gear reference assembly state, and is performed on the condition that the gear assembly in the gear reference assembly state is assembled.
In the fourth step, regarding the relationship between the shaft assembly and the gear assembly, when the planetary shaft main body is in the main body reference position and the gear assembly is in the gear reference assembly state, The relationship in which these assemblies can be combined is a first relationship, and the relationship in which the shaft assembly in the inclined assembly state and the gear assembly in the specific assembly state can be combined is a second relationship. As described above, the relationship between the shaft assembly assembled in the first step and the gear assembly assembled in the second step is set to the first relationship, and the first relationship is set. By changing the assembly state of the gear assembly to the specific assembly state based on the degree of inclination of the planetary shaft body measured in the third step, the relationship between the shaft assembly and the gear assembly Is set to the second relationship Method for manufacturing the conversion mechanism which is characterized in that what is done on the condition Rukoto. An annular shaft having a space extending in the axial direction, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear;
The sun shaft is configured to include a sun shaft body having a sun screw formed as a male screw and a sun gear formed as an external gear.
The planetary shaft includes a planetary shaft body having a planetary screw formed as a male screw and a planetary gear formed as an external gear;
The annular gear is formed separately from the annular shaft body;
The sun gear is formed separately from the sun shaft body;
The planetary gear is formed separately from the planetary shaft body;
A portion provided on the planetary shaft body and capable of supporting the planetary gear is used as a gear support portion, and a space provided on the planetary gear and capable of inserting the gear support portion is used as a main body insertion portion. The planetary shaft is configured by fitting a support portion and the main body insertion portion;
The annular screw and the sun screw mesh with the planetary screw;
The annular gear and the sun gear mesh with the planetary gear,
And a rotational linear motion conversion mechanism configured such that the other of the annular axis and the sun axis linearly moves through the planetary motion of the planetary axis accompanying the rotational motion of one of the annular axis and the sun axis. In the manufacturing method of
The rotational linear motion conversion mechanism is manufactured including the following steps: `` An assembly composed of a combination of the annular shaft main body, the sun shaft main body, and the planetary shaft main body is defined as an axis aggregate, and the shaft First step of assembling the assembly "
“Second step of assembling the gear assembly by using an assembly composed of a combination of the annular gear, the sun gear, and the planetary gear as a gear assembly”
“The planetary shaft of the shaft assembly assembled in the first step with the posture of the planetary shaft main body in which the centerline of the planetary shaft main body is parallel to the centerline of the solar shaft main body as a main body reference posture. The third step of measuring the inclination of the main body relative to the main body reference posture "
“As for the relationship between the shaft assembly and the gear assembly, the first assembly is the relationship that allows the sun shaft body and the sun gear to be combined, and the shaft assembly assembled in the first step A fourth step of setting the relationship with the gear assembly assembled in the second step to the first relationship. "
“The tip surface of the gear support portion of the planetary shaft body is a support portion end surface, the shape of the support portion end surface is a support portion end surface shape, the end surface of the planetary gear facing the planetary shaft body is a gear end surface, The shape of the main body insertion portion on the end surface is an insertion portion end surface shape, a virtual plane perpendicular to the center line of the solar shaft main body between the shaft assembly and the gear assembly is used as a reference surface, and the support portion end surface A figure obtained by projecting the shape with respect to the reference plane in the direction of the center line of the solar axis main body is a supporting part projected figure, and the insertion part end face shape is the center of the solar axis main body with respect to the reference plane. The figure obtained by projecting in the direction of the line is the insertion part projection figure, and the relationship between the shaft assembly and the gear assembly is the relationship when the support part projection figure is located in the insertion part projection figure. The second relationship Then, the planetary gear in which the annular gear, the sun gear, and the planetary gear are assembled in the gear assembly set in the first relationship in the fourth step and measured in the third step. A fifth step of changing the relationship between the shaft assembly and the gear assembly to the second relationship by changing based on the degree of inclination of the shaft body "
"Sixth step of assembling the geared assembly after passing through the fifth step, with the assembly formed by the combination of the shaft assembly and the gear assembly as a geared assembly"
A method of manufacturing a rotating linear motion conversion mechanism. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 4,
In the second step, with respect to the assembled state of the annular gear and the sun gear and the planetary gear in the gear assembly, a centerline of the annular gear and the sun gear and a centerline of the planetary gear are An assembly state parallel to each other is set as a gear reference assembly state, and is performed on the condition that the gear assembly in the gear reference assembly state is assembled.
In the fifth step, the rotation phase of the gear assembly relative to the rotation phase of the shaft assembly is set as a gear rotation phase, and the position of the planetary gear with respect to the annular gear and the sun gear in the gear assembly is set as an inter-gear position. As an inclination degree of the planetary shaft main body measured in the third step, at least one of the gear rotation phase and the inter-gear position of the gear assembly set in the first relationship in the fourth step. The rotation linear motion conversion mechanism manufacturing method is characterized in that it is performed on the condition that the relationship between the shaft assembly and the gear assembly is changed to the second relationship. . An annular shaft having a space extending in the axial direction, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear;
The sun shaft is configured to include a sun shaft body having a sun screw formed as a male screw and a sun gear formed as an external gear.
The planetary shaft includes a planetary shaft body having a planetary screw formed as a male screw and a planetary gear formed as an external gear;
The annular gear is formed separately from the annular shaft body;
The sun gear is formed separately from the sun shaft body;
The planetary gear is formed separately from the planetary shaft body;
A portion provided on the planetary shaft body and capable of supporting the planetary gear is used as a gear support portion, and a space provided on the planetary gear and capable of inserting the gear support portion is used as a main body insertion portion. The planetary shaft is configured by fitting a support portion and the main body insertion portion;
The annular screw and the sun screw mesh with the planetary screw;
The annular gear and the sun gear mesh with the planetary gear,
And a rotational linear motion conversion mechanism configured such that the other of the annular axis and the sun axis linearly moves through the planetary motion of the planetary axis accompanying the rotational motion of one of the annular axis and the sun axis. In the manufacturing method of
Manufacture of the rotational linear motion conversion mechanism including the following steps: `` An aggregate composed of a combination of the sun axis body and the planetary axis body is a basic aggregate, and the center line of the planetary axis body is The planetary axis main body is defined as a main body reference attitude that is parallel to the center line of the solar axis main body, and the planetary axis main body is assembled with the sun axis main body and the planetary axis main body in the basic assembly. The first step of assembling the basic assembly in the main body reference assembly state with the assembly state when the posture of the main body becomes the main body reference posture as the main body reference assembly state "
“Second step of preparing a laser displacement meter that can detect a change in the position of the end face of the planetary gear shaft by irradiating a laser beam with the tip face of the gear support section of the planetary shaft body as a support face.”
“The position of the laser displacement meter with respect to the planetary shaft body is set as a measurement position, and a position predetermined as the measurement position is set as a reference measurement position, and the position of the laser displacement meter with respect to the basic assembly assembled in the first step is set. Third step of setting the measurement position to the reference measurement position "
“Fourth step in which the measurement value obtained by irradiating the end surface of the support of the basic assembly through the laser displacement meter at the reference measurement position is the first measurement value”
“Fifth step of assembling the shaft assembly using the assembly formed by the combination of the basic assembly and the annular shaft body as the shaft assembly”
“Sixth step of setting the measurement position of the laser displacement meter with respect to the shaft assembly assembled in the fifth step as the reference measurement position”
“Seventh step in which a measurement value obtained by irradiating the end surface of the shaft assembly with a laser beam through the laser displacement meter at the reference measurement position is a second measurement value”
“A virtual plane perpendicular to the center line of the solar axis main body is defined as a reference plane, and the end face of the base assembly in the main body reference assembled state is the direction of the center line of the solar axis main body with respect to the reference plane. The figure obtained by projecting to the first projection figure is used as the first projection figure, and the end face of the shaft assembly assembled in the fifth step is projected in the direction of the center line of the solar axis body with respect to the reference plane. The graphic obtained by this is the second projected graphic, and the displacement direction and displacement amount of the second projected graphic with respect to the first projected graphic on the reference plane are the end surface displacement direction and the end surface displacement amount, respectively. Eighth step of grasping the end face displacement direction and the end face displacement amount based on the measured value and the second measured value "
“Assembly composed of a combination of the annular gear, the sun gear, and the planetary gear is a gear aggregate, and the assembled state of the annular gear, the sun gear, and the planetary gear in the gear aggregate. The center state of the annular gear and the sun gear and the center line of the planetary gear are parallel to each other as a gear reference assembly state, and the gear assembly in the gear reference assembly state is a reference. Ninth step of assembling the reference gear assembly as a gear assembly "
“As for the relationship between the shaft assembly and the reference gear assembly, the relationship in which the assemblies can be combined when the posture of the planetary shaft main body is the main body reference posture is used as the reference relationship. The tenth step of setting the relationship between the shaft assembly assembled in step 5 and the reference gear assembly assembled in the ninth step as the reference relationship ”
“The end face of the planetary gear facing the planetary shaft main body is a gear end face, and the shape of the main body insertion portion on the gear end face is an insert end face shape, and the reference is set to the reference relationship in the tenth step. A figure obtained by projecting the end face shape of the insertion portion of the gear assembly in the direction of the center line of the sun shaft main body with respect to the reference plane is defined as a third projected figure. The figure obtained by reflecting the end face displacement direction and the end face displacement amount grasped in step 8 is a fourth projected figure, and the insertion portion end face shape is determined with respect to the state of the reference gear assembly with respect to the shaft assembly. The reference tooth set in the reference relationship in the tenth step, with the state in which the fourth projection figure is obtained when projected in the direction of the center line of the sun axis body with respect to the reference plane Eleventh step of changing to the specified state based on the state of the aggregate to the end face displacement direction and the end surface displacement "
“A twelfth step of assembling the geared assembly after the eleventh step, with the assembly formed by a combination of the shaft assembly and the gear assembly as a geared assembly”
A method of manufacturing a rotating linear motion conversion mechanism. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 6,
In the eleventh step, the rotation phase of the gear assembly relative to the rotation phase of the shaft assembly is set as a gear rotation phase, and the position of the planetary gear with respect to the annular gear and the sun gear in the gear assembly is set as an inter-gear position. The reference gear set in the reference relationship in the tenth step with the gear rotation phase and the inter-gear position in the reference gear assembly in the specific state as the specific gear rotation phase and the specific inter-gear position, respectively. By reflecting the end face displacement direction and the end face displacement amount in the aggregate, the gear rotation phase and the inter-gear position of the reference gear aggregate are adapted to the specific gear rotation phase and the specific inter-gear position, respectively. A method for manufacturing a rotating linear motion conversion mechanism, characterized in that the method is performed as a condition. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 6 or 7,
The seventh step is performed under the condition that a constant load is applied to the planetary shaft body before irradiating the laser beam through the laser displacement meter. Mechanism manufacturing method. An annular shaft having a space extending in the axial direction, a solar shaft disposed inside the annular shaft, and a planetary shaft disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an annular screw formed as an internal thread and an annular gear formed as an internal gear;
The sun shaft is configured to include a sun shaft body having a sun screw formed as a male screw and a sun gear formed as an external gear.
The planetary shaft includes a planetary shaft body having a planetary screw formed as a male screw and a planetary gear formed as an external gear;
The annular gear is formed separately from the annular shaft body;
The sun gear is formed separately from the sun shaft body;
The planetary gear is formed separately from the planetary shaft body;
A portion provided on the planetary shaft body and capable of supporting the planetary gear is used as a gear support portion, and a space provided on the planetary gear and capable of inserting the gear support portion is used as a main body insertion portion. The planetary shaft is configured by fitting a support portion and the main body insertion portion;
The annular screw and the sun screw mesh with the planetary screw;
The annular gear and the sun gear mesh with the planetary gear,
And a rotational linear motion conversion mechanism configured such that the other of the annular axis and the sun axis linearly moves through the planetary motion of the planetary axis accompanying the rotational motion of one of the annular axis and the sun axis. In the manufacturing method of
Manufacture of the rotational linear motion conversion mechanism including the following steps: `` An aggregate composed of a combination of the sun axis body and the planetary axis body is a basic aggregate, and the center line of the planetary axis body is The planetary axis main body is defined as a main body reference attitude that is parallel to the center line of the solar axis main body, and the planetary axis main body is assembled with the sun axis main body and the planetary axis main body in the basic assembly. The first step of assembling the basic assembly in the main body reference assembly state with the assembly state when the posture of the main body becomes the main body reference posture as the main body reference assembly state "
“Second step of preparing a laser displacement meter that can detect a change in the position of the end face of the planetary gear shaft by irradiating a laser beam with the tip face of the gear support section of the planetary shaft body as a support face.”
“Third step of assembling the shaft assembly with the assembly formed by the combination of the basic assembly and the annular shaft body as the shaft assembly”
“Fourth step using the measurement value obtained by irradiating the end surface of the shaft assembly with the laser beam through the laser displacement meter as a reference measurement value”
“A virtual plane perpendicular to the center line of the solar axis main body is defined as a reference plane, and the end face of the base assembly in the main body reference assembled state is the direction of the center line of the solar axis main body with respect to the reference plane. The figure obtained by projecting to the first projection figure is used as the first projection figure, and the end face of the shaft assembly assembled in the third step is projected in the direction of the center line of the sun axis body with respect to the reference plane. The figure obtained by this is the second projected figure, the displacement direction and displacement amount of the second projected figure relative to the first projected figure on the reference plane are the end face displacement direction and the end face displacement amount, respectively, and the measurement of the reference Fifth step of grasping the end face displacement direction and the end face displacement amount based on the values "
“Assembly composed of a combination of the annular gear, the sun gear, and the planetary gear is a gear aggregate, and the assembled state of the annular gear, the sun gear, and the planetary gear in the gear aggregate. The center state of the annular gear and the sun gear and the center line of the planetary gear are parallel to each other as a gear reference assembly state, and the gear assembly in the gear reference assembly state is a reference. A sixth step of assembling the reference gear assembly as a gear assembly "
“Regarding the relationship between the shaft assembly and the reference gear assembly, the third step is based on a relationship in which these assemblies can be combined when the attitude of the planetary shaft main body is the main body reference attitude. The seventh step of setting the relationship between the shaft assembly assembled in step 6 and the reference gear assembly assembled in the sixth step to the reference relationship ”
“The end face of the planetary gear facing the planetary shaft main body is a gear end face, the shape of the main body insertion portion on the gear end face is an insertion end face shape, and the reference set in the reference relation in the seventh step” A figure obtained by projecting the end face shape of the insertion portion of the gear assembly in the direction of the center line of the sun shaft main body with respect to the reference plane is defined as a third projected figure. The figure obtained by reflecting the end face displacement direction and the end face displacement amount grasped in step 5 is a fourth projected figure, and the end face shape of the insertion portion with respect to the state of the reference gear assembly with respect to the shaft assembly is determined. The reference gear set to the reference relationship in the seventh step, with the state in which the fourth projection figure is obtained when projected in the direction of the center line of the sun axis body with respect to the reference plane Collection Eighth step of changing to the specified state based on the state of the body on the end face displacement direction and the end surface displacement "
“Ninth step of assembling the geared assembly after the eighth step, with the assembly formed by the combination of the shaft assembly and the gear assembly as a geared assembly”
A method of manufacturing a rotating linear motion conversion mechanism. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 9,
In the eighth step, the rotation phase of the gear assembly with respect to the rotation phase of the shaft assembly is set as a gear rotation phase, and the position of the planetary gear with respect to the annular gear and the sun gear in the gear assembly is an inter-gear position. The reference gear set in the seventh step as the reference gear rotation phase and the position between the gears in the reference gear assembly in the specific state as the specific gear rotation phase and the position between the specific gears, respectively. By reflecting the end face displacement direction and the end face displacement amount in the aggregate, the gear rotation phase and the inter-gear position of the reference gear aggregate are adapted to the specific gear rotation phase and the specific inter-gear position, respectively. A method for manufacturing a rotating linear motion conversion mechanism, characterized in that the method is performed as a condition. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 9 or 10,
The fifth step is performed on the condition that the end face displacement direction and the end face displacement amount are grasped based on the position of the end face of the support portion of the reference gear assembly and the reference measurement value which are grasped in advance. A method of manufacturing a rotating linear motion conversion mechanism, In the manufacturing method of the rotation linear motion conversion mechanism according to any one of claims 9 to 11,
The fourth step is performed under the condition that a constant load is applied to the planetary shaft main body before irradiating the laser beam through the laser displacement meter. Mechanism manufacturing method. In the manufacturing method of the rotation linear motion conversion mechanism according to any one of claims 1 to 12,
In the assembly of the geared assembly, the planetary shaft main body can change the posture between the annular shaft main body and the sun shaft main body in the shaft assembly, and the planetary gear in the gear assembly. Is carried out on condition that the posture can be changed between the annular gear and the sun gear. A method for manufacturing a rotating linear motion conversion mechanism.

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