JP2008002583A - 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 suppressing the inclination of a planetary shaft according to a variety of structures of the rotation-linear motion converting mechanism. <P>SOLUTION: This method of manufacturing the rotation-linear motion converting mechanism 1 comprises steps as follows. The step of coating the male screw 34 of a sun shaft body 31 with an adhesive agent. The step of assembling a first assembly by combining the sun shaft body 31 with planetary shaft bodies 41. The step of assembling a second assembly by combining the first assembly with a front ring gear 22. The step of assembling a third assembly by combining the second assembly with a ring shaft body 21. The step of assembling a gear assembly by combining gears 23, 33 and 43 with one another. The step of assembling a fourth assembly by combining the third assembly with the gear assembly. The step of assembling the rotation-linear motion converting mechanism 1 by combining the fourth assembly with collars 51, 52. <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.
JP-A-10-196757

  By the way, in the manufacturing process of the rotating linear motion conversion mechanism, the planetary axis is between the annular axis and the sun axis relative to the reference attitude (the attitude where the center line of the planet axis is parallel to the center line of the sun axis). It has been confirmed by the present inventor that this state is inclined. The reason why the planetary axis is tilted in this way is considered as follows.

  In the rotational linear motion conversion mechanism, the number of threads of each component is set to a different value. Therefore, when the female screw of the annular shaft and the male screw of the sun shaft are engaged with the male screw of each planetary shaft, these screws are used. A backlash is formed between the two. Moreover, the magnitude | size of this backlash changes according to the setting aspect of the number of strips of each screw. Therefore, in the manufacturing process of the rotating linear motion conversion mechanism, when a force is applied to the planetary axis in accordance with the combination of each component, the planetary axis is tilted by moving the planetary axis in the direction of the backlash. The rotating linear motion conversion mechanism may be assembled.

  For example, when the annular shaft is assembled to an assembly in which the sun axis and the planetary axis are combined in the production of the rotational linear motion conversion mechanism, the annular axis is used when the female screw of the annular axis is engaged with the male screw of the planetary axis. Since a force is applied to the planetary axis from, the inclination of the planetary axis occurs as described above.

  When the planetary shaft is tilted with respect to the reference posture in the rotational linear motion conversion mechanism, the screw engagement of each component will be non-uniform, so that the wear of the screws will be promoted locally, leading to a reduction in the service life. become. In addition, since the friction between the constituent elements increases, the conversion efficiency from the rotational motion to the linear motion is reduced.

  Therefore, in order to suppress the inclination of the planetary axis due to the production of the rotational linear motion conversion mechanism as described above, for example, a retainer is attached to both ends of the planetary axis for an assembly in which the sun axis and the planetary axis are combined. It is also possible to constrain the attitude of the planetary axis by Incidentally, since Patent Document 1 discloses a rotational linear motion conversion mechanism having a structure having a retainer, it is considered that the attitude of the planetary shaft is constrained by the retainer during the manufacture thereof.

  However, in such a manufacturing method, it is difficult to say that the inclination of the planetary shaft is sufficiently suppressed because the phase of each retainer may shift as the annular shaft is screwed into the aggregate. Therefore, it is conceivable to connect two retainers to each other through a plurality of shafts in order to suppress a phase shift. In this case, an axis connecting the retainers is arranged between the planetary shafts. Depending on the structure of the motion conversion mechanism, the required number of shafts may not be attached to each retainer. That is, it becomes difficult to sufficiently suppress the inclination of the planetary axis.

  The present invention has been made in view of such circumstances, and the object thereof is a rotational linear motion conversion mechanism capable of suppressing the inclination of the planetary shaft in response to more various structures of the rotational linear motion conversion mechanism. It is in providing the manufacturing method of.

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 plurality of planets disposed around the solar shaft. A shaft, the annular shaft is configured to include an annular shaft main body having a female thread, the sun shaft is configured to include a solar shaft main body having a male thread, and the planetary shaft is configured to have a male thread. Comprising a planetary shaft main body, having a female screw of the annular shaft main body meshing with a male screw of the planetary shaft main body, meshing a male screw of the solar shaft main body with a male screw of the planetary shaft main body, and A rotational linear motion conversion mechanism configured such that 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. Next steps That is, after preparing a fixing agent having a lower melting point than the annular axis, the sun axis, and the planetary axis and fixing the posture of the other element with respect to one element, the male screw of the solar axis body And a first step of applying the fixing agent to at least one of the male threads of the planetary shaft main body, “the attitude of the planetary shaft main body in which the center line of the planetary shaft main body is parallel to the center line of the solar shaft main body. In a state in which the planetary shaft main body is held in the reference posture after the first step, with the assembly formed by the combination of the solar shaft main body and the planetary shaft main body as a first aggregate. "Second step of assembling the first assembly" and "Third step of assembling the second assembly with the assembly constituted by the combination of the first assembly and the annular shaft body as the second assembly. Including It is summarized in that performing the production.

  (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 plurality of planets disposed around the solar shaft. A shaft, the annular shaft is configured to include an annular shaft main body having a female thread, the sun shaft is configured to include a solar shaft main body having a male thread, and the planetary shaft is configured to have a male thread. Comprising a planetary shaft main body, having a female screw of the annular shaft main body meshing with a male screw of the planetary shaft main body, meshing a male screw of the solar shaft main body with a male screw of the planetary shaft main body, and A rotational linear motion conversion mechanism configured such that 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. Next steps In other words, “the center axis of the planetary axis main body is parallel to the centerline of the solar axis main body, and the attitude of the planetary axis main body is a reference attitude, and is configured by a combination of the sun axis main body and the planetary axis main body. 1st step of assembling the first assembly in a state where the planetary shaft main body is held in the reference posture ”,“ more than the ring axis, the sun axis and the planetary axis. After preparing a fixing agent having a low melting point and capable of fixing the posture of the other element relative to one element, at least one of the male screw of the solar shaft body and the male screw of the planetary shaft body in the first assembly "Second step of applying the fixing agent" and "Assembly composed of a combination of the first assembly and the annular shaft body as a second assembly, after the second step, the second assembly Assemble body It is summarized in that to perform the preparation, including bright third step ".

  In the first and second aspects of the invention, the second aggregate is assembled in a state in which each planetary shaft main body is fixed to the solar shaft main body with a fixing agent (such as an adhesive). Thereby, since each planetary shaft main body is held in a fixed posture (reference posture) when the annular shaft main body is assembled to the first aggregate, the rotation linear motion conversion mechanism is assembled with the planetary shaft tilted. Can be suppressed. In addition, since the attitude of the planetary shaft body is constrained through a fixing agent, unlike the above-described manufacturing method using the retainer, the planetary shaft is not affected by the number of planetary shafts arranged in the rotational linear motion conversion mechanism. It is possible to suppress the tilt. As described above, according to the manufacturing method of the present invention, it becomes possible to suppress the inclination of the planetary shaft corresponding to the various structures of the rotary linear motion conversion mechanism.

  (3) The invention described in claim 3 is the method of manufacturing the rotational linear motion conversion mechanism according to claim 1 or 2, wherein the annular shaft includes the annular shaft main body and an internal annular gear. The sun shaft is configured to include the sun shaft main body and the externally toothed sun gear, and the planetary shaft is configured to include the planetary shaft body and the externally toothed planetary gear. The ring gear includes a first ring gear provided at one end of the ring shaft main body and a second ring gear provided at the other end of the ring shaft main body, The sun gear includes a first sun gear provided at one end of the sun shaft main body and a second sun gear provided at the other end of the sun shaft main body, and the planet gear as the planetary gear. A first planetary gear provided at one end of the shaft body and the other of the planetary shaft body A second planetary gear provided at an end, the first annular gear is formed separately from the annular shaft main body, and the second sun gear is formed separately from the solar shaft main body. The second planetary gear is formed separately from the planetary shaft body, the first annular gear meshes with the first planetary gear, the second annular gear and the second The rotational linear motion conversion mechanism configured to be in mesh with a planetary gear, meshing with the first sun gear and the first planetary gear, and meshing with the second sun gear and the second planetary gear. The following step, namely, “the posture of the planetary shaft main body with respect to the solar shaft main body through the fixing agent, with the aggregate constituted by the combination of the second aggregate and the second planetary gear as a third aggregate. Is fixed It is summarized in that to perform the production, including the fourth step "of assembling the third assembly.

  In the manufacturing process of the rotating linear motion conversion mechanism, if the planetary shaft body of the second aggregate is excessively inclined with respect to the reference posture, the second planetary gear cannot be assembled to the planetary shaft body. When such a situation occurs, the assembly work is temporarily interrupted, leading to a decrease in productivity. In this regard, in the above invention, since the planetary shaft main body is held in the reference posture and the second aggregate and the second planetary gear are combined, the second planetary gear is accurately made into the second aggregate. It can be assembled. Thereby, it becomes possible to suppress a reduction in productivity.

  (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 plurality of planets disposed around the solar shaft. A shaft, the annular shaft is configured to include an annular shaft main body having a female thread, the sun shaft is configured to include a solar shaft main body having a male thread, and the planetary shaft is configured to have a male thread. Comprising a planetary shaft main body, having a female screw of the annular shaft main body meshing with a male screw of the planetary shaft main body, meshing a male screw of the solar shaft main body with a male screw of the planetary shaft main body, and A rotational linear motion conversion mechanism configured such that 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. Next steps That is, after preparing a fixing agent that has a lower melting point than the annular axis, the sun axis, and the planetary axis and can fix the posture of the other element with respect to one element, "First step of applying the fixing agent to at least one of a female screw and a male screw of the planetary shaft main body", "the planetary shaft main body in which the center line of the planetary shaft main body is parallel to the center line of the annular shaft main body Is set as a reference posture, and an assembly constituted by a combination of the annular shaft main body and the planetary shaft main body is defined as a first aggregate, and the planetary shaft main body is held in the reference posture after the first step. A second step of assembling the first assembly in a state where the first assembly is assembled ”and“ an assembly composed of a combination of the first assembly and the solar shaft body as a second assembly; Including "3 steps" It is summarized as to perform the fabrication.

  (5) The invention according to claim 5 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a plurality of planets disposed around the solar shaft. A shaft, the annular shaft is configured to include an annular shaft main body having a female thread, the sun shaft is configured to include a solar shaft main body having a male thread, and the planetary shaft is configured to have a male thread. Comprising a planetary shaft main body, having a female screw of the annular shaft main body meshing with a male screw of the planetary shaft main body, meshing a male screw of the solar shaft main body with a male screw of the planetary shaft main body, and A rotational linear motion conversion mechanism configured such that 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. Next steps That is, "the orientation of the planetary shaft body in which the centerline of the planetary shaft body is parallel to the centerline of the annular shaft body is a reference posture, and the combination of the annular shaft body and the planetary shaft body First assembly for assembling the first assembly while the planetary shaft main body is held in the reference posture with the formed assembly as the first assembly, “the annular shaft, the sun shaft, and the planetary shaft A fixing agent having a lower melting point and capable of fixing the posture of the other element with respect to the one element, and then forming the female screw of the annular shaft main body and the male screw of the planetary shaft main body in the first assembly. "Second step of applying the fixing agent to at least one" and "Assembly composed of a combination of the first assembly and the solar shaft body as a second assembly, after passing through the second step, Combine two assemblies It is summarized in that to perform the preparation, including bright third step ".

  In the inventions of the fourth and fifth aspects, the second aggregate is assembled in a state in which each planetary shaft main body is fixed to the annular shaft main body by a fixing agent (such as an adhesive). As a result, each planetary shaft main body is held in a fixed posture (reference posture) when the solar shaft main body is assembled to the first assembly, and thus the rotation linear motion conversion mechanism is assembled with the planetary shaft tilted. It becomes possible to suppress. In addition, since the attitude of the planetary shaft body is constrained through a fixing agent, unlike the above-described manufacturing method using the retainer, the planetary shaft is not affected by the number of planetary shafts arranged in the rotational linear motion conversion mechanism. It is possible to suppress the tilt. As described above, according to the manufacturing method of the present invention, it becomes possible to suppress the inclination of the planetary shaft corresponding to the various structures of the rotary linear motion conversion mechanism.

  (6) The invention according to claim 6 is the method of manufacturing a rotational linear motion conversion mechanism according to claim 4 or 5, wherein the annular shaft includes the annular shaft main body and an internal annular gear. The sun shaft is configured to include the sun shaft main body and the externally toothed sun gear, and the planetary shaft is configured to include the planetary shaft body and the externally toothed planetary gear. The ring gear includes a first ring gear provided at one end of the ring shaft main body and a second ring gear provided at the other end of the ring shaft main body, The sun gear includes a first sun gear provided at one end of the sun shaft main body and a second sun gear provided at the other end of the sun shaft main body, and the planet gear as the planetary gear. A first planetary gear provided at one end of the shaft body and the other of the planetary shaft body A second planetary gear provided at an end, the first annular gear is formed separately from the annular shaft main body, and the second sun gear is formed separately from the solar shaft main body. The second planetary gear is formed separately from the planetary shaft body, the first annular gear meshes with the first planetary gear, the second annular gear and the second The rotational linear motion conversion mechanism configured to be in mesh with a planetary gear, meshing with the first sun gear and the first planetary gear, and meshing with the second sun gear and the second planetary gear. With respect to the following process, that is, “the assembly constituted by a combination of the second assembly and the second planetary gear is defined as a third assembly, and the planetary shaft main body with respect to the annular shaft main body is passed through the fixing agent. With the posture fixed It is summarized in that to perform the production, including the fourth step "of assembling the third assembly.

  In the manufacturing process of the rotating linear motion conversion mechanism, if the planetary shaft body of the second aggregate is excessively inclined with respect to the reference posture, the second planetary gear cannot be assembled to the planetary shaft body. When such a situation occurs, the assembly work is temporarily interrupted, leading to a decrease in productivity. In this regard, in the above invention, since the planetary shaft main body is held in the reference posture and the second aggregate and the second planetary gear are combined, the second planetary gear is accurately made into the second aggregate. It can be assembled. Thereby, it becomes possible to suppress a reduction in productivity.

  (7) The invention according to claim 7 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a plurality of planets disposed around the solar shaft. An annular shaft including an annular shaft main body having an internal thread and an internal toothed annular gear, and a solar shaft main body having an external thread and an external toothed sun gear. The planetary shaft includes a planetary shaft main body having a male screw and an external planetary gear, and the female screw of the annular shaft main body and the male screw of the planetary shaft main body include Meshing, meshing of the male screw of the sun shaft main body and the male screw of the planetary shaft main body, meshing of the annular gear and the planetary gear, meshing of the sun gear and the planetary gear, and the circle Accompanying the rotational movement of one of the ring axis and the sun axis Regarding the rotational linear motion conversion mechanism configured to require the other of the annular axis and the sun axis to linearly move through the planetary motion of the planetary axis, the following steps, namely, “the annular axis, the solar axis” And a fixing agent having a melting point lower than that of the planetary shaft and capable of fixing the posture of the other element with respect to one element, the male screw of the solar shaft main body, the male screw of the planetary shaft main body, and the sun gear And “first step of applying the fixing agent to at least one of the planetary gears”, “based on 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 An assembly composed of a combination of the sun shaft main body and the planetary shaft main body is set as a first assembly, and the planetary shaft main body is held in the reference posture after the first step. And a second step of assembling the first assembly, and an assembly composed of a combination of the first assembly and the annular shaft body is used as a second assembly. The gist is to perform the manufacturing process including the “process”.

  (8) The invention according to claim 8 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a plurality of planets disposed around the solar shaft. An annular shaft including an annular shaft main body having an internal thread and an internal toothed annular gear, and a solar shaft main body having an external thread and an external toothed sun gear. The planetary shaft includes a planetary shaft main body having a male screw and an external planetary gear, and the female screw of the annular shaft main body and the male screw of the planetary shaft main body include Meshing, meshing of the male screw of the sun shaft main body and the male screw of the planetary shaft main body, meshing of the annular gear and the planetary gear, meshing of the sun gear and the planetary gear, and the circle Accompanying the rotational movement of one of the ring axis and the sun axis Regarding the rotational linear motion conversion mechanism configured to require the other of the annular shaft and the sun shaft to linearly move through the planetary motion of the planetary shaft, the following steps, namely, “the centerline of the planetary shaft body is The attitude of the planetary axis body that is parallel to the center line of the solar axis body is set as a reference attitude, and an assembly constituted by a combination of the solar axis body and the planetary axis body is defined as the first assembly, The first step of assembling the first assembly with the planetary shaft main body held in the reference posture ”,“ the melting point lower than that of the annular shaft, the sun shaft, and the planetary shaft, After preparing a fixing agent capable of fixing the posture of the element, the fixing agent is applied to at least one of the male screw of the sun shaft main body and the male screw of the planetary shaft main body in the first assembly. And a second step including the step of applying the fixing agent to at least one of the sun gear and the planetary gear in the first assembly after the fixing agent is prepared "and" the first assembly. An assembly constituted by a combination of a body and the ring shaft main body as a second assembly, and including the third step of assembling the second assembly after the second step. It is a summary.

  In the inventions of the seventh and eighth aspects, the second aggregate is assembled in a state where each planetary shaft main body is fixed to the solar shaft main body with a fixing agent (adhesive or the like). Thereby, since each planetary shaft main body is held in a fixed posture (reference posture) when the annular shaft main body is assembled to the first aggregate, the rotation linear motion conversion mechanism is assembled with the planetary shaft tilted. Can be suppressed. In addition, since the attitude of the planetary shaft body is constrained through a fixing agent, unlike the above-described manufacturing method using the retainer, the planetary shaft is not affected by the number of planetary shafts arranged in the rotational linear motion conversion mechanism. It is possible to suppress the tilt. As described above, according to the manufacturing method of the present invention, it becomes possible to suppress the inclination of the planetary shaft corresponding to the various structures of the rotary linear motion conversion mechanism.

  (9) The invention according to claim 9 is the method of manufacturing a rotational linear motion conversion mechanism according to claim 7 or 8, wherein the planetary gear includes an accessory gear formed separately from the planetary shaft body. With respect to the rotational linear motion conversion mechanism configured as a requirement, the following step, that is, “the assembly configured by a combination of the second assembly and the accessory gear as a third assembly, through the fixing agent The gist is to include the fourth step of assembling the third aggregate in a state where the attitude of the planetary shaft main body with respect to the solar shaft main body is fixed.

  In the manufacturing process of the rotating linear motion conversion mechanism, if the planetary shaft body of the second aggregate is excessively inclined with respect to the reference posture, the second planetary gear cannot be assembled to the planetary shaft body. When such a situation occurs, the assembly work is temporarily interrupted, leading to a decrease in productivity. In this regard, in the above invention, since the planetary shaft main body is held in the reference posture and the second aggregate and the second planetary gear are combined, the second planetary gear is accurately made into the second aggregate. It can be assembled. Thereby, it becomes possible to suppress a reduction in productivity.

  (10) The invention according to claim 10 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a plurality of planets disposed around the solar shaft. An annular shaft including an annular shaft main body having an internal thread and an internal toothed annular gear, and a solar shaft main body having an external thread and an external toothed sun gear. The planetary shaft includes a planetary shaft main body having a male screw and an external planetary gear, and the female screw of the annular shaft main body and the male screw of the planetary shaft main body include Meshing, meshing of the male screw of the sun shaft body and the male screw of the planetary shaft body, meshing of the annular gear and the planetary gear, meshing of the sun gear and the planetary gear, and the circle With the rotational movement of one of the ring axis and the sun axis The rotational linear motion conversion mechanism configured on the condition that the other of the annular axis and the sun axis moves linearly through the planetary motion of the planetary axis, the following steps, that is, “the annular axis, the sun After preparing a fixing agent that has a lower melting point than the shaft and the planetary shaft and can fix the posture of the other element with respect to one element, the female screw of the annular shaft main body, the male screw of the planetary shaft main body, “First step of applying the fixing agent to at least one of the annular gear and the planetary gear”, “the planetary shaft body in which the center line of the planetary shaft body is parallel to the centerline of the annular shaft body Is set as a reference posture, and an assembly constituted by a combination of the annular shaft main body and the planetary shaft main body is defined as a first aggregate, and the planetary shaft main body is held in the reference posture after the first step. Shi A second step of assembling the first assembly in the state "and" a second assembly of the assembly composed of a combination of the first assembly and the solar shaft main body, and assembling the second assembly; The gist is to perform the manufacturing process including the “process”.

  (11) The invention according to claim 11 is an annular shaft having a space extending in the axial direction therein, a solar shaft disposed inside the annular shaft, and a plurality of planets disposed around the solar shaft. An annular shaft including an annular shaft main body having an internal thread and an internal toothed annular gear, and a solar shaft main body having an external thread and an external toothed sun gear. The planetary shaft includes a planetary shaft main body having a male screw and an external planetary gear, and the female screw of the annular shaft main body and the male screw of the planetary shaft main body include Meshing, meshing of the male screw of the sun shaft body and the male screw of the planetary shaft body, meshing of the annular gear and the planetary gear, meshing of the sun gear and the planetary gear, and the circle With the rotational movement of one of the ring axis and the sun axis The rotational linear motion conversion mechanism configured to require that the other of the annular shaft and the sun shaft linearly move through the planetary motion of the planetary shaft, the following steps, namely, “centerline of the planetary shaft body” The first aggregate is an assembly formed by combining the annular shaft main body and the planetary shaft main body, with the posture of the planetary shaft main body being parallel to the center line of the annular shaft main body as a reference posture As a first step of assembling the first assembly with the planetary shaft main body held in the reference posture, “one element having a melting point lower than that of the annular shaft, the sun shaft and the planetary shaft. After preparing a fixing agent capable of fixing the posture of the other element with respect to the first assembly, the fixing agent is applied to at least one of the female screw of the annular shaft main body and the male screw of the planetary shaft main body in the first assembly. And a second step including the step of applying the fixing agent to at least one of the annular gear and the planetary gear in the first aggregate after the fixing agent is prepared "and" the first The assembly composed of a combination of one assembly and the main body of the solar shaft is used as the second assembly, and the manufacturing is performed including the third step of assembling the second assembly after the second step. Is the gist.

  In the inventions according to claims 11 and 12, the second aggregate is assembled in a state in which each planetary shaft main body is fixed to the annular shaft main body by a fixing agent (such as an adhesive). As a result, each planetary shaft main body is held in a fixed posture (reference posture) when the solar shaft main body is assembled to the first assembly, and thus the rotation linear motion conversion mechanism is assembled with the planetary shaft tilted. It becomes possible to suppress. In addition, since the attitude of the planetary shaft body is constrained through a fixing agent, unlike the above-described manufacturing method using the retainer, the planetary shaft is not affected by the number of planetary shafts arranged in the rotational linear motion conversion mechanism. It is possible to suppress the tilt. As described above, according to the manufacturing method of the present invention, it becomes possible to suppress the inclination of the planetary shaft corresponding to the various structures of the rotary linear motion conversion mechanism.

  (12) The invention described in claim 12 is the method for manufacturing the rotational linear motion conversion mechanism according to claim 10 or 11, wherein the planetary gear includes an accessory gear formed separately from the planetary shaft body. With respect to the rotational linear motion conversion mechanism configured as a requirement, the following step, that is, “the assembly configured by a combination of the second assembly and the accessory gear as a third assembly, through the fixing agent The gist is to include the fourth step of assembling the third aggregate in a state where the attitude of the planetary shaft main body with respect to the annular shaft main body is fixed.

  In the manufacturing process of the rotating linear motion conversion mechanism, if the planetary shaft body of the second aggregate is excessively inclined with respect to the reference posture, the second planetary gear cannot be assembled to the planetary shaft body. When such a situation occurs, the assembly work is temporarily interrupted, leading to a decrease in productivity. In this regard, in the above invention, since the planetary shaft main body is held in the reference posture and the second aggregate and the second planetary gear are combined, the second planetary gear is accurately made into the second aggregate. It can be assembled. Thereby, it becomes possible to suppress a reduction in productivity.

  (13) The invention described in claim 13 is the manufacturing method of the rotary linear motion conversion mechanism according to claim 1, 2, 4, 5, 7, 8, 10 or 11, wherein The gist is to assemble the rotary linear motion conversion mechanism including the “fifth step of melting the fixing agent by heating two assemblies”.

  (14) According to the fourteenth aspect of the present invention, in the manufacturing method of the rotational linear motion conversion mechanism according to the third, sixth, ninth, or twelfth aspect, the following step, that is, “by heating the third assembly” The gist is to assemble the rotary linear motion conversion mechanism including the “sixth step of melting the fixing agent”.

  In the inventions according to the thirteenth and fourteenth aspects, the fixing agent is melted before the rotation linear motion conversion mechanism is completed. Thereby, it becomes possible to suppress the operation of the rotating linear motion conversion mechanism from being hindered by the fixing agent.

  (15) The invention according to claim 15 is the mechanical property required for the rotational linear motion conversion mechanism in the method for manufacturing the rotational linear motion conversion mechanism according to any one of claims 1 to 14. And the assembly of the components in the assembly process of the rotating linear motion conversion mechanism is a specific assembly, and the mechanical properties of the specific assembly are maintained at the required properties even when the specific assembly is heated. The temperature range is defined as a reference temperature range, and the highest temperature among the temperatures belonging to the reference temperature range is defined as a reference temperature. The fixing agent has a melting point lower than the reference temperature.

  According to the said invention, what has melting | fusing point below reference temperature is employ | adopted as a fixing agent. As a result, when the fixing agent is melted through heating the specific assembly, the mechanical properties of the specific assembly can be maintained at the required properties.

  (16) The invention according to claim 16 is the method of manufacturing a rotational linear motion conversion mechanism according to any one of claims 1 to 14, wherein the assembly of components in the assembly process of the rotational linear motion conversion mechanism The temperature range in which the specific aggregate is not annealed even when the specific aggregate is heated is defined as a reference temperature range, and the highest temperature among the temperatures belonging to the temperature range is defined as the reference temperature. Is summarized as having a melting point lower than the reference temperature.

  According to the said invention, what has melting | fusing point below reference temperature is employ | adopted as a fixing agent. Accordingly, the fixing agent can be melted through heating the specific assembly without annealing each component of the assembly.

  (17) The invention according to claim 17 is the method for producing a rotational linear motion conversion mechanism according to claim 15 or 16, wherein the specific aggregate is heated when the specific aggregate is heated to melt the fixing agent. Is heated to a temperature above the melting point of the fixing agent and below the reference temperature.

  According to the above invention, the specific assembly is heated to a temperature not lower than the melting point of the fixing agent and lower than the reference temperature to melt the fixing agent. Accordingly, when the invention described in claim 17 is based on the invention described in claim 15, the rotation linear motion conversion mechanism is assembled with the fixing agent removed, and the mechanical properties are required. Thus, it is possible to achieve compatibility with assembling the rotary linear motion conversion mechanism in a state maintained in the above state. Further, when the invention described in claim 17 is based on the invention described in claim 16, the rotating linear motion conversion mechanism is assembled with the fixing agent removed, and each component is annealed. It becomes possible to realize both the assembling of the rotating linear motion conversion mechanism 1 in a state where there is not.

  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 ring shaft 2 and the sun shaft 3 are arranged in a state in which the respective center lines are aligned or substantially aligned with each other. The sun shaft 3 and each planetary shaft 4 are arranged in a state where their center lines are parallel to each other or substantially parallel to each other. The planetary shafts 4 are arranged at equal intervals around the sun shaft 3.

  In the present embodiment, for each component of the rotational linear motion conversion mechanism 1, the posture in which the center line of the rotating linear motion conversion mechanism 1 is aligned with the center line of the sun shaft 3 and the posture in which the center line is substantially aligned are defined as the alignment posture. In addition, a posture in which the center line of itself is parallel to and substantially parallel to the center line of the sun shaft 3 is defined as a parallel posture. That is, the ring shaft 2 constitutes the rotary linear motion conversion mechanism 1 in a state where the ring shaft 2 is held in the aligned posture. Each planetary shaft 4 constitutes the rotational linear motion conversion mechanism 1 in a state where it is held in a parallel 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 FIG.
FIG. 3A shows a cross-sectional structure of the ring shaft 2.
FIG. 3B shows a cross-sectional structure in which a part of the ring shaft 2 is disassembled.

  The ring shaft 2 is configured by a combination of a ring shaft main body 21 (annular shaft main body), 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. Therefore, the alignment posture of the ring shaft 2 is ensured when the center line of the ring shaft main body 21 is aligned or substantially aligned with the center line of the sun shaft 3.

  The ring shaft main body 21 includes a main body screw portion 21A having an internal thread 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 21C to which the rear ring gear 23 is assembled. It is configured.

  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. 4A shows the front structure of the sun shaft 3.
FIG. 4B shows a front structure in a state where a part of the sunshaft 3 is disassembled.

  The sun shaft 3 is configured by a combination of a sun shaft main body 31 (sun shaft main body) and a rear 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 sunshaft main body 31 includes a main body screw portion 31A having a male thread 34 formed on the outer peripheral surface, a main body gear portion 31B having a spur toothed external gear (front sun gear 32), and a main body gear portion to which the rear sun gear 33 is assembled. And 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. 5A shows the front structure of the planetary shaft 4.
FIG. 5B shows a front structure in a state where a part of the planetary shaft 4 is disassembled.
FIG. 5C 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 (planetary axis main body) 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. Accordingly, when the center line of the planetary shaft main body 41 is parallel or substantially parallel to the center line of the sun shaft 3, the parallel posture of the planetary shaft 4 is ensured.

  The planetary shaft main body 41 has a rear surface to which a main body screw portion 41A having a male 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 are assembled. The side shaft 41 </ b> R and the front side shaft 41 </ b> F fitted into a jig when the rotary linear motion conversion mechanism 1 is assembled are configured.

  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 into the planetary shaft main body 41 by being inserted into the bearing hole 43H. 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.

  As for 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 relative 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. 6-9, 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. 6 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the center line of the sun shaft 3.
FIG. 7 shows a cross-sectional structure of the rotational linear motion conversion mechanism 1 along the DA-DA line of FIG.
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.

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 female screw 24 of the ring shaft main body 21 and the male 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.

  Thus, when a rotational motion is input to one of the ring shaft 2 and each planetary shaft 4, the engagement of the female screw 24 and the male screw 44, the engagement of the front ring gear 22 and the front planetary gear 42, and the rear ring gear 23, A force is transmitted to the other of the ring shaft 2 and each planetary shaft 4 through meshing with the rear planetary gear 43.

  In the sun shaft 3 and each planetary shaft 4, the male screw 34 of the sun shaft main body 31 and the male 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 male screw 34 and the male screw 44 are engaged, the front sun gear 32 and the front planetary gear 42 are engaged, and the rear sun gear 33 and the rear planetary gear are engaged. Through engagement with the gear 43, force is transmitted to the other of the sun shaft 3 and each planetary shaft 4.

  As described above, the rotational linear motion conversion mechanism 1 includes the speed reduction mechanism constituted by the female screw 24 of the ring shaft 2, the male screw 34 of the sun shaft 3, and the male screw 44 of each planetary shaft 4, the front ring gear 22 and the front sun gear 32. A speed reduction mechanism constituted by 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 configured.

<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 rotational motion is input to the ring shaft 2, the front ring gear 22 and each front planetary gear 42 are engaged, the rear ring gear 23 and each rear planetary gear 43 are engaged, and the female screw 24 and each male screw 44 are engaged. By transmitting force from the ring shaft 2 to each planetary shaft 4 through the meshing, each planetary shaft 4 revolves around the sun shaft 3 while rotating. In accordance with the planetary movement of the planetary shaft 4, each front planetary gear 42 and the front sun gear 32 are engaged with each other, each rear planetary gear 43 and the rear sun gear 33 are engaged, and each male screw 44 and the male screw 34 are engaged. When the force is transmitted from the planetary shaft 4 to 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 rotational motion is input to the sunshaft 3, the front sun gear 32 and the front planetary gear 42 are engaged, the rear sun gear 33 and the rear planetary gear 43 are engaged, and the male screw 34 and the male screw 44 are engaged. By transmitting force from the sun shaft 3 to each planetary shaft 4, each planetary shaft 4 revolves while rotating around the sun shaft 3. In accordance with the planetary movement 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 male screws 44 and the female screws 24 are engaged. When the force is transmitted from each planetary shaft 4 to the ring shaft 2 through 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. 10-20, the manufacturing method of the rotation linear motion conversion mechanism 1 is demonstrated. In the manufacturing method of the present embodiment, the rotation linear motion conversion mechanism 1 is manufactured including the following processes A to J. In addition, the rotation linear motion conversion mechanism 1 provided with the nine planetary shafts 4 is assumed here.

  [Step A (FIG. 10)] 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. 11)] The sunshaft body 31 is attached to the basic jig 61.
The structure of the basic jig 61 will be described with reference to FIG.
FIG. 12A shows the front structure of the basic jig 61.
FIG. 12B shows a cross-sectional structure of the basic jig 61 along the DD-DD line.

  The basic jig 61 includes a sun jig 62 for fixing the sunshaft main body 31 and a planetary jig 63 for supporting the front side shaft 41F of the planetary shaft main body 41. That is, the same number of planetary jigs 63 as the number of planetary shafts 4 provided in the rotary linear motion conversion mechanism 1 are formed integrally with the sun jig 62.

  The sun jig 62 is configured such that its center line (center line of the insertion hole 62H) 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 insertion hole 62H. Each planetary jig 63 is configured such that the center lines thereof are equally spaced around the center line of the insertion hole 62H. The sun jig 62 and each planetary jig 63 are configured such that their center lines are parallel to each other. A support hole 63H corresponding to the shape of the front shaft 41F of the planetary shaft main body 41 is formed at the tip of each planetary jig 63.

  When each front shaft 41F is fitted into the support hole 63H in a state where the center line of the planetary shaft main body 41 and the center line of the planetary jig 63 are aligned, the planetary shaft main body 41 surrounds the sun shaft main body 31 in a parallel posture. Are arranged at equal intervals.

In step B, specifically, the sun shaft main body 31 is attached to the basic jig 61 through the following operations (a) and (b).
(A): A portion of the sun shaft main body 31 that is located on the front side of the front sun gear 32 is inserted into the sun jig 62.
(B): The sunshaft body 31 is fixed to the sun jig 62.

  [Step C (FIG. 13)] Adhesive 71 is applied to the male thread 34 of the sunshaft body 31. Thereby, when the male screw 44 of the planetary shaft main body 41 is engaged with the male screw 34 of the sun shaft main body 31, the sun shaft main body 31 and the planetary shaft main body 41 are fixed by the adhesive 71.

  As the adhesive 71, an adhesive that satisfies the following "condition 1" and "condition 2" is employed. That is, the condition that the attitude of the planetary shaft main body 41 with respect to the sunshaft main body 31 can be fixed through the adhesion between the sunshaft main body 31 and the planetary shaft main body 41 is “condition 1”, and the ring shaft 2, the sunshaft 3, and the planetary shaft 4. A material having a lower melting point than “condition 2” is used as the adhesive 71 that satisfies these conditions. As an example of an adhesive satisfying such conditions, for example, an adhesive mainly composed of wax or paraffin can be cited.

  Specifically, “condition 2” can be set as follows. That is, when the mechanical properties required for the rotational linear motion conversion mechanism 1 are required properties, the assembly of components in the assembly process of the rotational linear motion conversion mechanism 1 is a specific assembly, and the specific assembly is heated The temperature range in which the mechanical properties of the specific assembly are maintained at the required properties can be set as the reference temperature range TX, and melting through heating in the reference temperature range TX can be set as “Condition 2”. Further, the reference temperature region TX can be set as a temperature region where the specific assembly is not annealed even when the specific assembly is heated.

  In the present embodiment, the adhesive 71 that satisfies the above-described conditions is adopted. Accordingly, the melting point TL of the adhesive 71 belongs to the reference temperature region TX. Further, when the highest temperature among the temperatures belonging to the reference temperature region TX is set as the reference temperature TH, the melting point TL of the adhesive 71 becomes a temperature lower than the reference temperature TH.

[Step D (FIG. 14)] An assembly (first assembly 91 (first assembly)) constituted by a combination of the sun shaft main body 31 and each planetary shaft main body 41 is assembled. That is, the first assembly 91 is assembled by assembling each planetary shaft body 41 to the sun shaft body 31. Specifically, the first assembly 91 is assembled through the following operations (a) and (b).
(A): Each planetary shaft so that the center line of the planetary shaft body 41 is aligned with the center line of the planetary jig 63, that is, the planetary shaft body 41 is bonded to the sun shaft body 31 in a parallel posture. The front shaft 41 </ b> F of the main body 41 is attached to the planetary jig 63.
(B): The male screw 34 of the sun shaft main body 31 and the male screw 44 of each planetary shaft main body 41 are engaged with each other, and the front sun gear 32 and each front planetary gear 42 are engaged with each other.

[Step E (FIG. 15)] An assembly (second assembly 92) constituted by a combination of the first assembly 91 and the front ring gear 22 is assembled. That is, the second assembly 92 is assembled by assembling the front ring gear 22 to the first assembly 91. Specifically, the second assembly 92 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 first assembly 91.
(B): The front ring gear 22 and the front planetary gears 42 are engaged with each other.

[Step F (FIG. 16)] An assembly (third assembly 93 (second assembly)) constituted by a combination of the second assembly 92 and the ring shaft main body 21 is assembled. That is, the third assembly 93 is assembled by assembling the ring shaft main body 21 to the second assembly 92. Specifically, the third assembly 93 is assembled through the following operations (a) to (c).
(A): The ring shaft main body 21 is disposed 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 second assembly 92.
(B): The female screw 24 of the ring shaft main body 21 is engaged with the male screw 44 of each planetary shaft main body 41 and screwed to a predetermined position.
(C): 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 G (FIG. 17)] An assembly (gear assembly 99) constituted by a combination of the rear ring gear 23, the rear sun gear 33, and each rear planetary gear 43 is assembled. Specifically, the following operations (a) and (b) are performed as operations for assembling the gear assembly 99 and operations accompanying it.
(A): The rear ring gear 23, the rear sun gear 33, and the respective rear planetary gears 43 are attached to the corresponding positions of the gear jig 64. That is, on the gear jig 64, the rear ring gear 23 and the rear sun gear 33 are engaged with the respective rear planetary gears 43. Through this operation, the gear assembly 99 is in a state where the center line of the back ring gear 23 and the center line of the back sun gear 33 are aligned and the center line of each back planetary gear 43 is parallel to the center line of the back sun gear 33. Is assembled.
(B): After removing the gear assembly 99 from the gear jig 64, the gear assembly 99 is placed at a position where the center lines of the rear ring gear 23 and the rear sun gear 33 are aligned with the center line of the ring shaft body 21 of the third assembly 93. Moving. Through this operation, the back ring gear 23 and the back sun gear 33 are held in the aligned posture, and the back planetary gears 43 are held in the parallel posture.

[Step H (FIG. 18)] An assembly (fourth assembly 94 (third assembly)) constituted by a combination of the third assembly 93 and the gear assembly 99 is assembled. That is, the fourth assembly 94 is assembled by assembling the gear assembly 99 to the third assembly 93. Specifically, the fourth assembly 94 is assembled through the following operations (a) to (c).
(A): Each rear planetary gear 43 of the gear assembly 99 is attached to the corresponding rear shaft 41R of the planetary shaft main body 41.
(B): The rear ring gear 23 is fitted into the main body gear portion 21 </ b> C of the ring shaft main body 21 and then press-fitted into the ring shaft main body 21.
(C): The rear sun gear 33 is fitted into the main body gear portion 31 </ b> C of the sun shaft main body 31 and then press-fitted into the sun shaft main body 31.

[Step I (FIG. 19)] The adhesive 71 is removed by heating the fourth assembly 94. Specifically, the adhesive 71 is removed through the following operations (a) to (c).
(A): The fourth assembly 94 is disposed in the heating device 72.
(B): The fourth assembly 94 is heated from the temperature before heating to a temperature not lower than the melting point TL of the adhesive 71 and lower than the reference temperature TH through the heating device 72.
(C): Maintain the temperature of the fourth assembly 94 at the temperature obtained in the operation (b) for a predetermined time. Thereby, since the adhesive 71 melts, the adhesive 71 is removed from the fourth assembly 94.

[Step J (FIG. 20)] An assembly (rotational linear motion conversion mechanism 1) constituted by a combination of the fourth 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 fourth assembly 94. 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 rotational linear motion conversion mechanism 1, the number of threads of the ring shaft 2, the sun shaft 3 and each planetary shaft 4 is set to a different value, so that the female screw 24 of the ring shaft 2 and the male screw of the sun shaft 3 are set. Backlash is formed between the screws 34 and the male screws 44 of the planetary shafts 4 when they are engaged with each other. Moreover, the magnitude | size of this backlash changes according to the setting aspect of the number of strips of each screw. For this reason, when a force is applied to the planetary shaft main body 41 in accordance with the combination of each component 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 rotary linear motion conversion mechanism 1 may be assembled with the main body 41 tilted with respect to the parallel posture.

  For example, when the rotary linear motion conversion mechanism 1 is manufactured, when the ring shaft main body 21 is assembled to each planetary shaft main body 41 after combining the sun shaft main body 31 and each planetary shaft main body 41 as in this embodiment, In this way, the planetary shaft main body 41 is inclined. That is, when the female screw 24 of the ring shaft main body 21 is engaged with the male screw 44 of each planetary shaft main body 41, a force is applied from the ring shaft main body 21 to each planetary shaft main body 41, so that the planetary shaft main body 41 is subjected to the backlash. Therefore, the planetary shaft main body 41 is inclined.

  In this regard, in the manufacturing method of the present embodiment, the third assembly 93 is assembled in a state where each planetary shaft main body 41 is fixed to the sunshaft main body 31 with the adhesive 71. Therefore, the ring shaft main body 21 is assembled to the second assembly. When assembled to 92, each planetary shaft main body 41 is held in a constant posture (parallel posture). As a result, it is possible to prevent the rotating linear motion conversion mechanism 1 from being assembled while the planetary shaft 4 is tilted.

  (2) In the manufacturing method of the present embodiment, the posture of each planetary shaft main body 41 is constrained through adhesion to the sunshaft main body 31, and therefore, unlike the manufacturing method using the retainer described above, rotational linear motion Regardless of the number of planetary shafts 4 arranged in the conversion mechanism 1, the inclination of each planetary shaft 4 can be suppressed. Thus, according to the manufacturing method of the present embodiment, it is possible to suppress the inclination of the planetary shaft 4 corresponding to more various structures of the rotary linear motion conversion mechanism 1.

  (3) In the rotating linear motion conversion mechanism 1, when the planetary shaft 4 is inclined with respect to the parallel posture, the meshing of the screws becomes uneven between the ring shaft 2 and the sun shaft 3 and each planetary shaft 4. For this reason, the wear of the screw is locally promoted, resulting in a decrease in the service life. Further, since the friction between the ring shaft 2 and the sun shaft 3 and each planetary shaft 4 is increased, the conversion efficiency from the rotational motion to the linear motion is also lowered.

  In this respect, according to the manufacturing method of the present embodiment, since the inclination of the planetary shaft body 41 accompanying the assembly of the rotary linear motion conversion mechanism 1 is suppressed, the life of the rotary linear motion conversion mechanism 1 is improved and the linear motion is linear. It becomes possible to improve the efficiency of conversion to exercise.

  (4) When the planetary shaft main body 41 of the third assembly 93 is excessively inclined with respect to the parallel posture in the manufacturing process of the rotary linear motion conversion mechanism 1, each rear planetary gear 43 of the gear assembly 99 is replaced with the planetary shaft main body 41. Cannot be assembled to the rear side shaft 41R. That is, the gear assembly 99 cannot be assembled to the third assembly 93. When such a situation occurs, the assembly work is temporarily interrupted, leading to a decrease in productivity.

  In this regard, in the manufacturing method of the present embodiment, the third assembly 93 and the gear assembly 99 are combined in a state where the planetary shaft main bodies 41 are held in a parallel posture by the adhesive 71. To be assembled to the third assembly 93. Thereby, it becomes possible to suppress a reduction in productivity.

  (5) In the manufacturing process of the rotating linear motion conversion mechanism 1, when the planetary shaft body 41 of the third assembly 93 is inclined with respect to the parallel posture but the degree of inclination is relatively small, each rear planetary of the gear assembly 99 is provided. The gear 43 can be assembled to the rear side shaft 41R of the planetary shaft main body 41. However, in this case, the following new problems arise. That is, since each back planetary gear 43 is assembled to the back side shaft 41R in a state of being inclined following the posture of the planetary shaft main body 41, the back ring gear 23 is in a state of being inclined with respect to the parallel posture. And the rear sun gear 33 is engaged. As a result, the meshing of the gears becomes uneven between the ring shaft 2 and the sun shaft 3 and each planetary shaft 4, so that the wear of the gears is promoted locally, thereby reducing the life of the rotary linear motion conversion mechanism 1. To come to. Further, since the friction between the ring shaft 2 and the sun shaft 3 and each planetary shaft 4 is increased, the conversion efficiency from the rotational motion to the linear motion is also lowered.

  In this regard, in the manufacturing method of the present embodiment, the third assembly 93 and the gear assembly 99 are combined with each planetary shaft body 41 held in a parallel posture by the adhesive 71. It is possible to prevent the rear ring gear 23 and the rear sun gear 33 from being meshed with each other in a state where the gear is inclined. As a result, the life of the rotary linear motion conversion mechanism 1 can be improved and the conversion efficiency from the rotary motion to the linear motion can be improved.

  (6) As a manufacturing method for suppressing the inclination of each planetary shaft main body 41 associated with the assembly of the ring shaft main body 21, in addition to the manufacturing method of the present embodiment, each planetary shaft main body 41 of the first assembly 91 or the second assembly 92 is provided. A manufacturing method in which both ends of the substrate are supported by a jig is conceivable. Here, as an example of such a jig, a retainer that collectively supports the front side shaft 41F of each planetary shaft main body 41, a retainer that collectively supports the rear side shaft 41R of each planetary shaft main body 41, and each of these retainers. Assume a jig composed of a plurality of shafts to be connected.

  According to the manufacturing method using this jig, the inclination of each planetary shaft main body 41 can be suppressed by assembling the ring shaft main body 21 to the second assembly 92 in a state where the jig is mounted. When the rear planetary gear 43 is assembled to the main body 41 (corresponding to the step of assembling the gear assembly 99 to the third assembly 93), it is necessary to remove the retainer mounted on the rear side shaft 41R from each planetary shaft main body 41. That is, an assembly in which the front ring gear 22 and the front sun gear 32 are engaged with the front planetary gear 42 and the rear ring gear 23 and the rear sun gear 33 and the rear planetary gear 43 are engaged (reference assembly (main assembly)). It is necessary to remove one retainer before assembling the fourth assembly 94 of the embodiment)).

  Thus, in the above manufacturing method, since the retainer is removed in a state where the rear planetary gear 43 of each planetary shaft main body 41 is not engaged with the corresponding gear, the inclination of the planetary shaft main body 41 when the rear planetary gear 43 is assembled. May occur. Incidentally, in the rotary linear motion conversion mechanism 1, the posture of the planetary shaft main body 41 may not be sufficiently restrained only by screw engagement due to backlash between the screws. At this time, the planetary shaft main body 41 is inclined by removing the retainer before assembling the reference assembly (fourth assembly 94 in the present embodiment). On the other hand, in the reference assembly, both ends of the planetary shaft main body 41 are restrained by the meshing of the gears, so that the inclination of the planetary shaft main body 41 can be suppressed without restraining the attitude of the planetary shaft main body 41 through a jig or the like. become.

  In contrast to the above manufacturing method, in the manufacturing method of the present embodiment, each planetary shaft body 41 is restrained through the adhesive 71, so that each planetary shaft body 41 is not restrained through meshing of the gears at both ends. The planetary shaft main body 41 can be held in a parallel posture. Therefore, the inclination of the planetary shaft main body 41 that occurs when the rear planetary gear 43 is assembled to each planetary shaft main body 41 can be suitably suppressed.

  (7) In the manufacturing method of the present embodiment, the adhesive 71 is melted before the rotation linear motion conversion mechanism 1 is completed. Thereby, it becomes possible to suppress the operation of the rotary linear motion conversion mechanism 1 from being hindered by the adhesive 71.

  (8) When the adhesive 71 is removed before the reference assembly (fourth assembly 94 in the present embodiment) is assembled in the manufacturing process of the rotary linear motion conversion mechanism 1, the following is performed. It becomes a problem. In this case, each planetary shaft main body 41 is not bonded to the sunshaft main body 31 in a state where both ends of each planetary shaft main body 41 are not constrained through the meshing of the gears, so that the planetary shaft main body 41 is removed as the adhesive 71 is removed. There may be a tilt of

  In this regard, in the manufacturing method of the present embodiment, the adhesive 71 is removed after the attitude of the planetary shaft main body 41 is constrained through the engagement of the ring gears 22 and 23 and the sun gears 32 and 33 and the planetary gears 42 and 43. Therefore, the inclination of the planetary shaft main body 41 can be suitably suppressed.

  (9) When the manufacturing method of applying the adhesive 71 to the planetary shaft main body 41 is adopted, when the sunshaft main body 31 and each planetary shaft main body 41 are combined through the robot, the planetary shaft main body 41 is bonded to the robot. Is also envisaged.

  In this regard, in the manufacturing method of the present embodiment, the adhesive 71 is applied to the male thread 34 of the sunshaft body 31 when the sunshaft body 31 and each planetary shaft body 41 are bonded. A combination of the main body 31 and the planetary shaft main body 41 can be suitably implemented.

  (10) In the manufacturing method of this embodiment, the adhesive 71 having a melting point TL lower than the reference temperature TH is adopted. As a result, when the adhesive 71 is melted by heating the fourth assembly 94, the mechanical properties of the fourth assembly 94 can be maintained at the required properties. That is, the adhesive 71 can be removed without annealing each component of the fourth assembly 94.

  (11) In the manufacturing method of this embodiment, the fourth assembly 94 is heated to a temperature not lower than the melting point TL of the adhesive 71 and lower than the reference temperature TH to melt the adhesive 71. Thus, it is possible to realize both the assembly of the rotational linear motion conversion mechanism 1 with the adhesive 71 removed and the assembly of the rotational linear motion conversion mechanism 1 while maintaining the mechanical properties at the required properties. Will be able to. That is, it is possible to realize both the assembly of the rotational linear motion conversion mechanism 1 with the adhesive 71 removed and the assembly of the rotational linear motion conversion mechanism 1 with each component not annealed. It becomes like this.

<Example of change of embodiment>
In addition, the said embodiment can also be changed and implemented as shown, for example below.
In each of the above embodiments, the fourth assembly 94 is assembled through a combination of the third assembly 93 and the gear assembly 99. However, the assembly procedure of the fourth assembly 94 is, for example, any of the following (A) to (C) You can also change it.
(A) The fourth assembly 94 is assembled by assembling the rear ring gear 23, the rear sun gear 33, and the respective rear planetary gears 43 to the third assembly 93 individually.
(B) The 4th assembly 94 is assembled by assembling the assembly comprised by the combination of the back surface ring gear 23 and each back surface planetary gear 43, and the back surface sun gear 33 to the 3rd assembly 93 separately.
(C) The fourth assembly 94 is assembled by assembling the assembly constituted by the combination of the rear sun gear 33 and each rear planetary gear 43 and the rear ring gear 23 to the third assembly 93 individually.

In the above embodiment, the sun shaft main body 31 and each planetary shaft main body 41 are fixed by applying the adhesive 71 to the male screw 34 of the sun shaft main body 31, but a method of fixing these components Can be changed as follows. That is, the sun shaft main body 31 and each planetary shaft main body 41 can be fixed by adopting at least one of the following methods (A) to (C).
(A) Before assembling the first assembly 91, the adhesive 71 is applied to at least one of the male screw 34 and the front sun gear 32 of the sun shaft body 31.
(B) Before assembling the first assembly 91, the adhesive 71 is applied to at least one of the male screw 44 and the front planetary gear 42 of each planetary shaft body 41.
(C) Before assembling the third assembly 93, the adhesive 71 is applied to at least one of the meshing portion between the male screw 34 and each male screw 44 of the second assembly 92 and the meshing portion between the front sun gear 32 and each front planetary gear 42. To do.

In the above embodiment, the manufacturing method for assembling the third assembly 93 by assembling the ring shaft main body 21 to the second assembly 92 is assumed. However, the process until the third assembly 93 is assembled is changed as follows. You can also That is, after assembling an assembly (ring assembly) constituted by a combination of the ring shaft main body 21, each planetary shaft main body 41 and the front ring gear 22, the sunshaft main body 31 is assembled to the assembly to form the third The assembly 93 can also be assembled. When such a manufacturing method is adopted, at least one of the methods shown in (A) to (C) is adopted to fix each planetary shaft main body 41 to the ring shaft main body 21 so that the sunshaft main body 31 is attached to the ring. Inclination of the planetary shaft main body 41 that occurs when assembled to the assembly can be suppressed.
(A) Before assembling the ring assembly, the adhesive 71 is applied to at least one of the female thread 24 and the front ring gear 22 of the ring shaft main body 21.
(B) Before assembling the ring assembly, the adhesive 71 is applied to at least one of the male screw 44 and the front planetary gear 42 of each planetary shaft body 41.
(C) Before assembling the third assembly 93, the adhesive 71 is applied to at least one of the meshing portion between the female screw 24 and each male screw 44 of the ring assembly and the meshing portion between the front ring gear 22 and each front planetary gear 42. .

  In the above embodiment, the adhesive 71 is used as a fixing agent for fixing each planetary shaft main body 41 to the sun shaft main body 31. However, for example, grease may be used instead of the adhesive 71. In short, any fixing agent can be used as long as the planetary shaft main body 41 can be constrained to a fixed posture by being fixed to the sun shaft main body 31 until the reference assembly is assembled in the manufacturing process of the rotary linear motion conversion mechanism 1. The type can be changed as appropriate.

In the above embodiment, the present invention is manufactured for the rotational linear motion conversion mechanism 1 having a structure in which force is transmitted between the ring shaft 2 and the sun shaft 3 and each planetary shaft 4 through meshing of screws and gears. Although the method is applied, the manufacturing method of the present invention is applied to a rotary linear motion conversion mechanism having a structure in which force is transmitted only by screw engagement between the ring shaft 2 and the sun shaft 3 and each planetary shaft 4. You can also Specifically, the manufacturing method of the present invention can be embodied as a manufacturing method of the rotational linear motion conversion mechanism by making the following changes to the manufacturing method of the above embodiment.
(A): Step E, step G, and step H are omitted.
(B): In step F, an assembly constituted by a combination of the first assembly 91 and the ring shaft main body 21 is assembled.
(C): In step I, the assembly assembled in the step (b) is heated to remove the adhesive 71.
(D): In step J, the rotational linear motion conversion mechanism 1 is assembled by combining the assembly that has undergone step (c) with the front collar 51 and the back collar 52.

  -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, force is transmitted between the shafts of the ring shaft and the male screws of the sun shaft and the male screws of the planetary shafts, and planetary shaft movement of one of the ring shaft and sun shaft is accompanied by rotational movement of the planetary shaft. As long as the rotation linear motion conversion mechanism linearly moves the other of the ring shaft and the sun shaft, the present invention can be embodied as a manufacturing method thereof.

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) Sectional drawing which shows the cross-section along the centerline 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 DA-DA line | wire of FIG. 6 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. 6 about the rotation linear motion conversion mechanism of the embodiment. Sectional drawing which shows the cross-section along the DC-DC line of FIG. 6 about the rotation linear motion conversion mechanism of the embodiment. 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 front view which shows the front structure about the basic jig 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 DD-DD line of FIG. 12 (A) about the basic jig. 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. 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. 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.

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 ... female screw, 3 ... sun shaft, 31 ... sun shaft main body, 31A ... main body screw portion, 31B ... main body gear portion, 31C ... main body gear portion, 32 ... front sun gear, 33 ... rear sun gear, 34 ... male screw, 4 ... planetary shaft , 41 ... Planetary shaft main body, 41A ... Main body screw part, 41B ... Main body gear part, 41F ... Front side shaft, 41R ... Rear side shaft, 42 ... Front planetary gear, 43 ... Rear planetary gear, 43H ... Bearing hole, 44 ... Male screw, 51 ... front collar, 51A ... bearing, 51H ... oil hole, 52 ... back collar, 52A ... bearing, 53 ... Ring, 61 ... basic jig, 62 ... sun jig, 62H ... insertion hole, 63 ... planetary jig, 63H ... support hole, 64 ... gear jig, 71 ... adhesive, 72 ... heating device, 91 ... first Assembly, 92 ... second assembly, 93 ... third assembly, 94 ... fourth assembly, 99 ... gear assembly.

Claims (17)

An annular shaft having a space extending in the axial direction, a solar shaft disposed inside the annular shaft, and a plurality of planetary shafts disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an internal thread;
The sun axis is configured to include a sun axis body having a male thread;
The planetary shaft is configured to include a planetary shaft body having a male screw;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
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. about,
The manufacturing is performed including the following steps: “Preparing a fixing agent having a melting point lower than that of the annular axis, the sun axis, and the planetary axis and capable of fixing the posture of the other element with respect to one element Then, the first step of applying the fixing agent to at least one of the male screw of the solar shaft main body and the male screw of the planetary shaft main body "
“A set composed of a combination of the solar axis body and the planetary axis body, with 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 as a reference attitude The second step of assembling the first aggregate with the body as the first aggregate and holding the planetary shaft main body in the reference posture after the first step "
“Third step of assembling the second assembly using the assembly formed by the combination of the first assembly and the annular shaft body as the second 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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an internal thread;
The sun axis is configured to include a sun axis body having a male thread;
The planetary shaft is configured to include a planetary shaft body having a male screw;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
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. about,
The manufacturing is performed including the following steps: `` The orientation of the planetary shaft body in which the centerline of the planetary shaft body is parallel to the centerline of the solar shaft body is a reference posture, and the solar shaft body and the A first step of assembling the first aggregate in a state in which the planetary shaft main body is held in the reference posture with the aggregate configured by the combination with the planetary shaft main body as the first aggregate.
“After preparing a fixing agent having a lower melting point than the annular axis, the sun axis, and the planetary axis and fixing the attitude of the other element relative to one element, the sun in the first assembly Second step of applying the fixing agent to at least one of the male screw of the shaft body and the male screw of the planetary shaft body "
“Third step of assembling the second assembly after the second step, with the assembly formed by the combination of the first assembly and the annular shaft body as the second 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 1 or 2,
The annular shaft includes the annular shaft main body and an internal annular gear;
The sun shaft is configured to include the sun shaft body and the external sun gear;
The planetary shaft is configured including the planetary shaft body and an external planetary gear;
The annular gear includes a first annular gear provided at one end of the annular shaft main body and a second annular gear provided at the other end of the annular shaft main body,
As the sun gear, comprising a first sun gear provided at one end of the sun shaft main body and a second sun gear provided at the other end of the sun shaft main body,
The planetary gear includes a first planetary gear provided at one end of the planetary shaft main body and a second planetary gear provided at the other end of the planetary shaft main body,
The first annular gear is formed separately from the annular shaft body;
The second sun gear is formed separately from the sun shaft body;
The second planetary gear is formed separately from the planetary shaft body;
The first annular gear meshes with the first planetary gear,
The second annular gear and the second planetary gear mesh with each other;
Meshing of the first sun gear and the first planetary gear;
About the rotational linear motion conversion mechanism configured as a requirement that the second sun gear and the second planetary gear mesh with each other,
The manufacturing is performed including the following steps: “The assembly formed by a combination of the second assembly and the second planetary gear is a third assembly, and the planetary shaft with respect to the solar shaft main body is passed through the fixing agent. A fourth step of assembling the third assembly with the body posture fixed "
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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an internal thread;
The sun axis is configured to include a sun axis body having a male thread;
The planetary shaft is configured to include a planetary shaft body having a male screw;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
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. about,
The manufacturing is performed including the following steps: “Preparing a fixing agent having a melting point lower than that of the annular axis, the sun axis, and the planetary axis and capable of fixing the posture of the other element with respect to one element Then, the first step of applying the fixing agent to at least one of the internal thread of the annular shaft body and the external thread of the planetary shaft body "
“A configuration of the planetary shaft main body is a combination of the annular shaft main body and the planetary shaft main body, with the attitude of the planetary shaft main body in which the centerline of the planetary shaft main body is parallel to the centerline of the annular shaft main body as a reference posture. As a first assembly, a second step of assembling the first assembly with the planetary shaft body held in the reference posture after the first step "
“Third step of assembling the second assembly using the assembly formed by the combination of the first assembly and the solar shaft body as a second 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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft is configured to include an annular shaft body having an internal thread;
The sun axis is configured to include a sun axis body having a male thread;
The planetary shaft is configured to include a planetary shaft body having a male screw;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
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. about,
The manufacturing is performed including the following steps: “The planetary shaft main body in which the center line of the planetary shaft main body is parallel to the center line of the annular shaft main body is a reference posture, and the annular shaft main body is And a first step of assembling the first aggregate in a state where the planetary shaft main body is held in the reference posture.
“After preparing a fixing agent that has a lower melting point than the ring axis, the sun axis, and the planetary axis and that can fix the posture of the other element relative to one element, the circle in the first assembly Second step of applying the fixing agent to at least one of the internal thread of the annular shaft body and the external thread of the planetary shaft body "
“Third step of assembling the second assembly after passing through the second step, with the assembly formed by the combination of the first assembly and the solar shaft body as the second 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 or 5,
The annular shaft includes the annular shaft main body and an internal annular gear;
The sun shaft is configured to include the sun shaft body and the external sun gear;
The planetary shaft is configured including the planetary shaft body and an external planetary gear;
The annular gear includes a first annular gear provided at one end of the annular shaft main body and a second annular gear provided at the other end of the annular shaft main body,
As the sun gear, comprising a first sun gear provided at one end of the sun shaft main body and a second sun gear provided at the other end of the sun shaft main body,
The planetary gear includes a first planetary gear provided at one end of the planetary shaft main body and a second planetary gear provided at the other end of the planetary shaft main body,
The first annular gear is formed separately from the annular shaft body;
The second sun gear is formed separately from the sun shaft body;
The second planetary gear is formed separately from the planetary shaft body;
The first annular gear meshes with the first planetary gear,
The second annular gear and the second planetary gear mesh with each other;
Meshing of the first sun gear and the first planetary gear;
About the rotational linear motion conversion mechanism configured as a requirement that the second sun gear and the second planetary gear mesh with each other,
The manufacturing is performed including the following steps: “A set composed of a combination of the second set and the second planetary gear is used as a third set, and the planet for the ring shaft main body through the fixing agent. A fourth step of assembling the third assembly with the shaft body fixed in position "
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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft includes an annular shaft main body having an internal thread and an internal annular gear;
The sun shaft is configured including a sun shaft main body having an external thread and a sun gear of external teeth,
The planetary shaft is configured to include a planetary shaft body having an external thread and an external planetary gear;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
The ring gear and the planetary gear mesh with each other;
Meshing of the sun gear and 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. about,
The manufacturing is performed including the following steps: “Preparing a fixing agent having a melting point lower than that of the annular axis, the sun axis, and the planetary axis and capable of fixing the posture of the other element with respect to one element Then, the first step of applying the fixing agent to at least one of the male screw of the sun shaft main body, the male screw of the planetary shaft main body, the sun gear, and the planetary gear ”
“A set composed of a combination of the solar axis body and the planetary axis body, with 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 as a reference attitude The second step of assembling the first aggregate with the body as the first aggregate and holding the planetary shaft main body in the reference posture after the first step "
“Third step of assembling the second assembly using the assembly formed by the combination of the first assembly and the annular shaft body as the second 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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft includes an annular shaft main body having an internal thread and an internal annular gear;
The sun shaft is configured including a sun shaft main body having an external thread and a sun gear of external teeth,
The planetary shaft is configured to include a planetary shaft body having an external thread and an external planetary gear;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
The ring gear and the planetary gear mesh with each other;
Meshing of the sun gear and 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. about,
The manufacturing is performed including the following steps: `` The orientation of the planetary shaft body in which the centerline of the planetary shaft body is parallel to the centerline of the solar shaft body is a reference posture, and the solar shaft body and the A first step of assembling the first aggregate in a state in which the planetary shaft main body is held in the reference posture with the aggregate configured by the combination with the planetary shaft main body as the first aggregate.
“After preparing a fixing agent that has a lower melting point than the annular axis, the sun axis, and the planetary axis and that can fix the posture of the other element relative to one element, the sun axis in the first assembly Applying the fixing agent to at least one of the male screw of the main body and the male screw of the planetary shaft main body; and preparing the fixing agent and then fixing the fixing agent to at least one of the sun gear and the planetary gear in the first assembly The second step including at least one of the step of coating
“Third step of assembling the second assembly after the second step, with the assembly formed by the combination of the first assembly and the annular shaft body as the second 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 7 or 8,
As the planetary gear, the rotating linear motion conversion mechanism configured to include an accessory gear formed separately from the planetary shaft main body,
The manufacturing is performed including the following steps: “Assembly composed of a combination of the second assembly and the attached gear is used as a third assembly, and the planetary shaft main body with respect to the solar shaft main body through the fixing agent is used. The fourth step of assembling the third assembly with the posture fixed "
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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft includes an annular shaft main body having an internal thread and an internal annular gear;
The sun shaft is configured including a sun shaft main body having an external thread and a sun gear of external teeth,
The planetary shaft is configured to include a planetary shaft body having an external thread and an external planetary gear;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
The ring gear and the planetary gear mesh with each other;
Meshing of the sun gear and 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. about,
The manufacturing is performed including the following steps: “Preparing a fixing agent having a melting point lower than that of the annular axis, the sun axis, and the planetary axis and capable of fixing the posture of the other element with respect to one element Then, a first step of applying the fixing agent to at least one of the female screw of the annular shaft main body, the male screw of the planetary shaft main body, the annular gear, and the planetary gear ”
“A configuration of the planetary shaft main body is a combination of the annular shaft main body and the planetary shaft main body, with a posture of the planetary shaft main body in which a centerline of the planetary shaft main body is parallel to a centerline of the annular shaft main body As a first assembly, a second step of assembling the first assembly with the planetary shaft body held in the reference posture after the first step "
“Third step of assembling the second assembly using the assembly formed by the combination of the first assembly and the solar shaft body as a second 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 plurality of planetary shafts disposed around the solar shaft;
The annular shaft includes an annular shaft main body having an internal thread and an internal annular gear;
The sun shaft is configured including a sun shaft main body having an external thread and a sun gear of external teeth,
The planetary shaft is configured to include a planetary shaft body having an external thread and an external planetary gear;
The internal thread of the annular shaft body meshes with the external thread of the planetary shaft body;
The male screw of the sun shaft main body and the male screw of the planetary shaft main body mesh with each other;
The ring gear and the planetary gear mesh with each other;
Meshing of the sun gear and 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. about,
The manufacturing is performed including the following steps: “The planetary shaft main body in which the center line of the planetary shaft main body is parallel to the center line of the annular shaft main body is a reference posture, and the annular shaft main body is And a first step of assembling the first aggregate in a state where the planetary shaft main body is held in the reference posture.
“After the preparation of a fixing agent that has a lower melting point than the annular axis, the sun axis, and the planetary axis and can fix the posture of the other element relative to one element, the annular ring in the first assembly Applying the fixing agent to at least one of the female screw of the shaft main body and the male screw of the planetary shaft main body; and after preparing the fixing agent, at least one of the annular gear and the planetary gear in the first assembly Second step including at least one of the step of applying the fixative "
“Third step of assembling the second assembly after passing through the second step, with the assembly formed by the combination of the first assembly and the solar shaft body as the second 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 10 or 11,
As the planetary gear, the rotating linear motion conversion mechanism configured to include an accessory gear formed separately from the planetary shaft main body,
The manufacturing is performed including the following steps: “The assembly formed by a combination of the second assembly and the attached gear is a third assembly, and the planetary shaft body with respect to the annular shaft body through the fixing agent. The fourth step of assembling the third assembly in a state where the posture is fixed "
A method of manufacturing a rotating linear motion conversion mechanism. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 1, 2, 4, 5, 7, 8, 10, or 11.
Assembling the rotary linear motion conversion mechanism including the following step "Fifth step of melting the fixing agent by heating the second 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 3, 6, 9 or 12,
Assembling the rotary linear motion conversion mechanism including the following step "Sixth step of melting the fixing agent by heating the third assembly"
A method of manufacturing a rotating linear motion conversion mechanism. In the manufacturing method of the rotation linear motion conversion mechanism as described in any one of Claims 1-14,
The mechanical properties required for the rotational linear motion conversion mechanism are required properties, and the assembly of components in the assembly process of the rotational linear motion conversion mechanism is a specific assembly, and the specific assembly is heated. The temperature range in which the mechanical properties of the specific assembly are maintained at the required properties is set as a reference temperature range, the highest temperature among the temperatures belonging to the reference temperature range is set as the reference temperature, and the fixing agent is less than the reference temperature. A method for producing a rotating linear motion conversion mechanism, characterized by having a melting point of In the manufacturing method of the rotation linear motion conversion mechanism as described in any one of Claims 1-14,
The assembly of the components in the assembly process of the rotational linear motion conversion mechanism is defined as a specific assembly, and a temperature region in which the specific assembly is not annealed even when the specific assembly is heated is defined as a reference temperature region. The method for producing a rotating linear motion conversion mechanism, wherein the highest temperature among the temperatures to which the fixing belongs is defined as a reference temperature, and the fixing agent has a melting point lower than the reference temperature. In the manufacturing method of the rotation linear motion conversion mechanism according to claim 15 or 16,
When the specific assembly is heated to melt the fixing agent, the specific assembly is heated to a temperature not lower than the melting point of the fixing agent and lower than the reference temperature. .

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