JP4704803B2 - Gear body assembling method and gear position measuring device - Google Patents

Description

  The present invention relates to a method of assembling two gear bodies each having a bevel-shaped gear in a state where the bevel-shaped gears mesh with each other, and the position of each bevel-shaped gear required in the assembling work is described. It relates to a device for measuring.

  (A) a first gear body having a first bevel gear, (b) a second gear body having a second bevel gear, and (c) the two gear bodies having their rotation axes perpendicular to each other. In the gear assembly that includes a base that rotatably holds the bevel gears in a state of being in mesh with each other and the bevel gears meshing with each other, for example, the second gear body is replaced with the first gear. An assembling operation is performed in which the body is assembled to a base body that has already been rotatably assembled. In the assembling work, in order to realize an appropriate meshing state of the two bevel gears in consideration of an appropriate amount of backlash, the assembling position of the second gear body with respect to the base in the rotation axis direction of the second gear body is set. It is required to be appropriate. Therefore, in order to satisfy the requirement, (i) a base reference that is a reference plane provided on the base (a reference plane set at a right angle to the assembly axis that is the rotation axis of the second gear body when it is assembled) Measuring a first gear distance from a surface to a set meshing reference position set for the first bevel gear as a reference for meshing with the second bevel gear, and (ii) a second gear As a reference for meshing with the first bevel gear from the second gear body reference surface, which is a reference surface provided on the body (reference surface set perpendicular to the rotation axis of the second gear body) A second gear distance, which is a distance to the set meshing reference position set for the bevel gear, and (iii) based on the measured first gear distance and second gear distance, 2 Calculate the proper separation distance from the gear body reference surface, and based on the proper separation distance, the rotational axis direction It like to determine the position with proper assembly for definitive substrate of the second gear member is made.

  As a specific example of the above assembling work in the past, for example, the assembling work described in the following patent document can be cited. First, the object of the assembly work will be described. The object is a final reduction gear mounted on a vehicle as shown in FIG. 3 of the patent document, and the final reduction gear is used as a base. A differential carrier (hereinafter sometimes simply referred to as “carrier”), a drive pinion (hereinafter sometimes abbreviated as “pinion”) as a first gear body rotatably held by the carrier, and a carrier that can rotate. And a differential assembly (hereinafter, may be abbreviated as “diff assembly”) as the second gear body. More specifically, the carrier includes a carrier body and a carrier lid coupled to the carrier body, and the differential assembly includes a differential gear and a ring gear that is attached to the ring gear and functions as a reduction gear. The differential device includes a differential mechanism, a differential case (hereinafter sometimes abbreviated as “diff case”) in which the ring gear is fixed and the ring gear is fixed to the outer periphery. A pair of output shafts connected to the mechanism and coaxially protruding from the differential case in a direction facing away from each other and connected to each of the left and right drive wheels, and each of the pair of output shafts. The carrier is rotated by being supported by the carrier through a pair of side bearings (angular tapered roller bearings) externally fitted to the carrier. It is a function. The pinion is rotatably assembled to the carrier body via a bearing, and the differential assembly is fitted so that each of the pair of side bearings is fitted into a bearing fitting portion provided on each of the carrier body and the carrier lid. By being assembled into the carrier, it can be assembled into the carrier. In the assembled state, the rotation axis of the pinion and the rotation axis of the differential assembly (the rotation axis of the pair of output shafts) are three-dimensionally intersected at right angles, and the pinion gear portion (functioning as a reduction gear) and the ring gear Are engaged. The pinion gear portion and the ring gear are hypoid gears which are a kind of bevel gears.

  The assembling work with the final reduction gear as the object is the work of assembling the differential assembly to the carrier that the pinion has already assembled to the carrier body. In this work, the meshing between the ring gear and the gear part of the pinion is performed. In order to achieve an appropriate state, the assembly position of the differential assembly in the rotational axis direction with respect to the carrier needs to be appropriate. Therefore, in order to determine the assembly position, an appropriate thickness is provided between the end surfaces of the bearing fitting portions of the carrier body and the carrier lid and the end surfaces of the pair of side bearings of the differential assembly. An annular shim is interposed.

In order to determine an appropriate thickness of the shim, the following two measurement operations described in FIG. 1 of the patent document are performed in the assembly operation. One of the two measurement operations is that the carrier has three surfaces, the mating surface of the carrier main body and the carrier lid, and the end surfaces of the bearing fitting portions of the carrier main body and the carrier lid. Set as the base reference plane, specify the distance between the three reference planes, and set the above-mentioned setting on the mating face or the end face of the bearing fitting part of the carrier body and the pinion gear part. In this operation, the distance from the meshing reference position is measured as the first gear distance. The other of the two measurements is that, in the differential assembly, the end surfaces of the two side bearings are set as the second gear body reference surface, and the distance between the two reference surfaces is specified. Thus, the distance between the end face of one of the side bearings and the above-described set engagement reference position set for the ring gear is an operation for measuring the distance as the above-described second gear distance. Based on the first gear distance and the second gear distance obtained by these measurement operations, the distance between the end face of the bearing fitting portion of the carrier body and one end face of the pair of side bearings, and the carrier lid An appropriate separation distance between the end face of the body bearing fitting portion and the other end face of the pair of side bearings is calculated, and the thickness of the shim is determined based on the calculation result.
Japanese Patent Laid-Open No. 6-66351

  In the assembly work described in the following patent document, the first gear distance is measured by a touch sensor fixed at a predetermined position in one tooth groove of a pinion gear portion which is a first bevel gear. Insert the tip of the probe (having a width smaller than the width of the tooth gap), rotate the pinion to bring the tip of the probe into contact with one side of the tooth gap, and the pinion in that state The rotation angle is detected, and then the pinion is rotated in the opposite direction to contact the other side surface of the tooth groove, and after detecting the rotation angle of the pinion in that state, the difference between the two rotation angles is obtained. Based on the angular difference, the first gear distance is calculated according to a calculation formula determined depending on the shape of the tooth gap. This measuring method has a drawback that it is complicated because the first gear distance is obtained by calculation based on two detection data. Further, in view of tooth formation errors, as described in the patent document, measurements are performed on a plurality of tooth spaces (in the document, measurement is performed on all tooth spaces), and the plurality of tooth spaces are measured. When the calculation of the first gear distance is performed every time, the measurement method has a disadvantage that the time required for the work becomes enormous.

  In the assembling work described in the following patent document, the second gear distance is measured by a displacement sensor fixed at a predetermined position in one tooth groove of the ring gear which is the second bevel gear. It is done by inserting a child. In the measurement method, since the measurement result for one tooth gap is used as the second gear distance, the method has a drawback that the measurement accuracy is poor in cases such as a case where undulation in the circumferential direction of the tooth is the cause. . In consideration of this, when performing measurement for a plurality of tooth spaces, the differential assembly must be set for each tooth space, and if such measurement work is performed, the work is performed. It takes a lot of time to complete. This is also a drawback of the measurement method.

  Some of the above-mentioned drawbacks are the drawbacks of the assembly work described in the following patent document. However, the conventional assembly work related to the above-mentioned gear assembly including the assembly work is not suitable for these disadvantages. It is considered that it is possible to improve the practicality of the conventional assembling work by eliminating any of these various drawbacks. The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a gear body assembling method with improved practicality, and to be used in the gear body assembling method. It is an object of the present invention to provide a gear position measuring device that can be used.

  The gear body assembling method of the present invention includes the above-described (i) first gear distance measurement, (ii) second gear distance measurement, and (iii) proper assembling position determination. ) Measuring the first gear distance based on the minimum value of the advancement amount of the measuring element, and (B) Measuring the second gear distance using a measuring tool having a plurality of measuring elements. It is characterized in that at least one of the multi-measurement member measurement is performed in at least one of (i) first gear distance measurement and (ii) second gear distance measurement which can be performed by at least one of them.

  More specifically, (A) measuring element advancement minimum value-based measurement is performed by using a first measuring element that is movable in the direction perpendicular to the rotation axis of the first gear body and can be advanced and retracted and urged in the advancing direction. This is done by measuring the minimum value of the advancement amount of the measuring element that changes with the rotation of the first gear body in a state where it is fitted in one tooth groove of the bevel gear. Also, (B) multi-measurement-use measurement is a state in which a measuring tool having three or more measuring elements whose tip portions are spaced apart from the measurement reference plane and the second bevel gear are biased with each other. The contact distance between the measurement reference surface of the measuring tool and the second gear body reference surface is set in a state in which the tip of the probe is fitted in the tooth groove of the second bevel gear. It is done like measuring.

  The first gear position measuring device of the present invention is a device for performing the above-mentioned (A) measuring element advance amount minimum value-based measurement, and (A-1) is capable of moving forward and backward and is biased in the advance direction. (A-2) The advance amount measuring device that measures the advance amount of the measure member, and (A-2) the advance amount measuring device at the tip end of the measure member, 1 of the first bevel gear A measuring instrument holding mechanism that is fitted in one tooth groove and is movable in a direction perpendicular to the rotation axis of the first gear body, and (A-3) a gear that rotates the first gear body. A first gear distance that certifies a first gear distance based on a local minimum value in a change associated with rotation of a first gear body of an amount of advancement of a probe measured by a body rotation device and (A-4) an advancement amount measuring device; It is equipped with a certification device.

  A second gear position measuring device according to the present invention is a device for executing the above-mentioned (B) measurement using a plurality of probe elements, and (B-1) each tip is separated from the measurement reference plane by a certain distance. And a measuring tool having three or more measuring elements fitted in different tooth spaces of the second bevel gear, and (B-2) holding the measuring tool in a state that allows positional variation, and measuring tool. A measuring instrument bevel-shaped gear abutting device that abuts the second bevel-shaped gear and the second bevel-shaped gear in the rotational axis direction, and (B-3) a measurement reference surface and a second gear body reference surface A separation distance measuring device for measuring the separation distance, and (B-4) a second gear distance recognition device for determining the second gear distance based on the measured separation distance are provided.

  In the above (A) measuring element advancement minimum value-based measurement, the first gear distance is measured based on the minimum value of the advancement amount of the measuring element. Therefore, according to the measurement method, measurement based on one detection data is performed. This makes measurement work simple and quick. Moreover, in the measurement using the multiple probe (B), the measurement of the second gear distance using the multiple probes is performed. Therefore, according to the measurement method, the measurement with good accuracy can be performed quickly. Become. Therefore, the gear body assembling method of the present invention that can enjoy at least one of the advantages of (A) measuring element advancement minimum value-based measurement and (B) the advantage of using multiple measuring elements is a practical assembling method. It becomes. Further, according to the gear position measuring device of the present invention, either the measurement element advance amount minimum value-based measurement or (B) measurement using a plurality of measurement elements can be performed, and the gear body assembling method using the apparatus is It becomes a practical assembly method.

Aspects of the Invention

  In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the claimable inventions, and is not intended to limit the combinations of the constituent elements constituting those inventions to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In each of the following items, item (1) is a term indicating a precondition of a gear body assembling method that is a claimable invention, and item (1) is a technical feature of item (2). The addition of at least one of the technical features of (4) corresponds to claim 1, and the addition of the technical features of (2) to (1) corresponds to (2). The term (4) is added with the technical features of the item (3), and the item (1) is added with the technical features of the item (2) and (4). It corresponds to claim 4, respectively. The (11) term corresponds to claim 5 and the (21) term corresponds to claim 6.

(1) A second gear body having a second bevel gear that meshes with the first bevel gear on a base on which a first gear body having a first bevel gear has already been rotatably assembled. A gear body assembling method for assembling in a state where the rotation axis of the first gear body intersects the rotation axis of the first gear body at right angles,
Engagement of the first bevel-shaped gear with the second bevel-shaped gear from a base reference plane set at a right angle to the assembly axis that is the rotation axis of the second gear body in the assembled state A first gear distance measuring step for measuring a first gear distance that is a distance to a set meshing reference position set as a reference for
Setting mesh set as a reference for meshing of the second bevel gear with the first bevel gear from a second gear body reference plane set perpendicular to the rotation axis of the second gear body A second gear distance measuring step for measuring a second gear distance which is a distance to the reference position;
An appropriate separation distance between the base reference surface and the second gear body reference surface based on the first gear distance and the second gear distance measured in the first gear distance measuring step and the second gear distance measuring step. And a proper assembly position determination step of determining an appropriate assembly position in the rotation axis direction of the second gear body with respect to the base based on the proper separation distance. .

  As described above, the aspect of this section is an aspect which is a premise in the gear body assembling method of the claimable invention. The gear body assembling method of the present embodiment is not particularly limited to the target product. To put it simply, the gear body assembling method is applied to various products arranged so that the gear bodies each having a bevel gear are meshed with each other. On the other hand, it is widely applicable. “Umbrella gear” is a concept that means a gear having an umbrella shape, and examples of the umbrella gear include a helical bevel gear, a helical bevel gear, a curved bevel gear, a hypoid gear, and the like. In addition, the “first gear body” and the “second gear body” may be configured by only bevel gears, and include each bevel gear and a shaft body that supports the bevel gears. The bevel gear and the shaft body may be configured to be relatively rotatable, or may not be relatively rotatable, or may be integrally formed. The first gear body and the second gear body are arranged so that their rotational axes intersect at right angles. This “crossing at right angles” means that the two rotational axes are located on one plane. This does not mean only the case where the two rotation axes are included, but also includes the case where the two rotation axes intersect three-dimensionally. For example, when the bevel gear is a hypoid gear, the rotation axes of the two gear bodies are three-dimensionally crossed in a torsional position. Furthermore, the “base” of the gear assembly is not limited to one constituted by a single member, and may be constituted by a plurality of members. In that case, the method of assembling in this aspect may be a method of assembling the second gear body with respect to the first gear body assembled to a part of a plurality of members constituting the base. Good. In addition, a method in which the second gear body and another member constituting the base body are assembled to the first gear body assembled to a part of the plurality of members constituting the base body may be used. .

  Each of the “base reference surface” set on the base and the “second gear base reference surface” set on the second gear body may be set one by one, and a plurality of one or both of them may be provided. May be. When at least one of the base reference surface and the second gear body reference surface is provided in plural, the positional relationship between the plurality of reference surfaces in at least one of them, more specifically, the assembly axis or the rotation axis of the second gear body It is necessary that the distance between each other in the extending direction is known or can be grasped by measurement. When a plurality of reference gears are provided, the first gear distance and the second gear distance may be measured with respect to any one of the reference surfaces provided. Furthermore, in calculating the proper separation distance between the base reference surface and the second gear body reference surface, as long as the above-described proper assembly position of the second gear body can be determined, any one of a plurality of reference surfaces provided What is necessary is just to calculate the appropriate separation distance with respect to the thing. Therefore, when at least one of the base reference surface and the second gear body reference surface is provided in plural, the proper distance between the base reference surface and the second gear body reference surface may be calculated. is there. Further, the base body reference surface and the second gear body reference surface do not necessarily have to be substantial surfaces existing on the surface of either the base body or the second gear body. That is, it may be a virtual surface without an entity. Specifically, for example, when the second gear body is assembled to the base via some kind of inclusion such as a bearing, the inclusion is positioned at an appropriate position with respect to the base or the second gear body. In this case, any surface constituting the surface of the inclusion can be used as a virtual reference surface.

  The “set meshing reference position” of each of the first bevel gear and the second bevel gear is an appropriate meshing state of the two bevel gears, for example, in a meshing state where an appropriate amount of backlash exists. The position relationship between the two is not limited as long as it is a defined relationship. Specifically, for example, the position is set at an arbitrary position or position in the tooth surface of each bevel gear, the space in the tooth gap, or the like. Is possible. Further, the respective setting meshing reference positions do not necessarily need to coincide with each other, for example, an arbitrary position that is separated by a predetermined distance in the extending direction of the assembly axis or the rotation axis of the second gear body. Is possible.

  The assembly of the second gear body to the base based on the “appropriate assembly position” is, for example, when there are a plurality of at least one of the base reference surface and the second gear body reference surface. It is possible to interpose an inclusion (for example, a liner, shim, etc.) having a thickness corresponding to the “appropriate separation distance” between any one of the plurality of reference surfaces and the other reference surface. In this way, the second gear body can be easily assembled at the proper assembly position.

  In addition, the order which performs the said 1st gear distance measurement process and the 2nd gear distance measurement process is not specifically limited, The aspect of this term may perform any process first. In many cases, the gear body is assembled in a state in which a preload is applied in the rotation axis direction. When such a gear assembly is assembled, the first gear distance or the second gear It is desirable to measure the gear distance while applying a preload similar to the preload in the state where the gear body is actually assembled.

(2) The second gear distance measuring step includes
Three or more of which the respective front end portions are located on one circumference parallel to the measurement reference surface and are simultaneously fitted in different tooth spaces of the second bevel gear while being in contact with both side surfaces of the tooth spaces. The measuring tool having the measuring element and the second bevel-shaped gear are brought into contact with each other in the rotational axis direction of the second bevel-shaped gear in a state where they are urged to each other, and The gear assembly according to (1), comprising a multi-measurement-use measuring step of measuring the second gear distance based on a separation distance between the measurement reference surface and the second gear body reference surface. How to attach.

  The mode described in this section is a mode related to the improvement of the second gear distance measurement. In short, in the second gear distance measurement described in this section, the measuring tool having a plurality of measuring elements is used, and the plurality of measuring elements are fitted into the plurality of tooth spaces of the second bevel gear. The second gear distance is measured at. Therefore, even if there is a tooth formation error such as a swell in the circumferential direction on the teeth of the second bevel gear, the error can be absorbed and the second gear distance can be accurately measured. In addition, unlike the measurement using a single probe, the measurement for a plurality of locations can be performed with a single setting, so that accurate measurement can be performed quickly. Furthermore, since the second bevel gear and the measuring element are brought into contact with each other in a biased state, the measuring tool automatically moves due to the guide effect of the measuring element by the tooth gap, and the measuring element The center of one circle in which is placed is automatically positioned on the rotation axis of the second gear body. That is, according to the second gear distance measurement described in this section, since the automatic alignment of the center axis of the measuring tool and the second gear body is realized, highly accurate measurement can be easily realized. Become. In that sense, the measuring tool is held in a state allowing the position variation in the direction of the rotation axis of the second gear body and in the plane intersecting the rotation axis, and in this state, the measuring tool and the second bevel gear It is desirable to make them contact.

  The shape of the tip of the measuring element fitted into the tooth groove of the second bevel gear is not particularly limited, but may be spherical. Further, it is desirable that the tip portions of the plurality of measuring elements are arranged without any deviation in the circumferential direction on a circumference where they are located. Furthermore, the mutual biasing state of the tip of the measuring element and the second bevel gear, for example, the state where they are pressed against each other by action, reaction, etc. is realized by a device that applies some force such as elastic force. Or may be realized by gravity acting on the measuring tool or the second gear body.

(3) The measurement process using the multiple probe is
The separation distance is measured continuously or intermittently in a state where the second bevel gear is rotated, and a plurality of values of the separation distance measured in a set rotation angle range of the second bevel gear are obtained. The gear body assembling method according to item (2), which is a step of measuring the second gear distance based on the second gear distance.

  The aspect described in this section is an aspect in which the second bevel gear is rotated, in other words, the measuring tool is rotated in the measurement of the second gear distance using the plurality of measuring elements. It is. When measuring the separation distance between the measurement reference surface of the measuring tool and the second gear body reference surface, according to one measurement, the second bevel gear is provided inclined with respect to the rotation axis of the second gear body. The inclination is a measurement error. The aspect of this section is an aspect in consideration of such a situation. Since the measurement is performed based on the measurement value measured while rotating the second bevel gear, more accurate measurement is possible. In addition, the specific mode in the case of measuring the second gear distance based on a plurality of measurement values is not particularly limited, for example, having an average value, a median value, etc. of the plurality of measurement values, The second gear distance can be used. Note that it is also possible to detect an abnormal inclination of the second bevel gear, an abnormal setting for measurement, or the like due to a variation in a plurality of measurement values.

(4) The first gear distance measuring step includes
A measuring instrument having a probe that can be advanced and retracted and biased in the advancing direction is positioned so that the advancing direction of the measuring element is a direction in which the assembly axis extends. In a state of being fitted into one tooth groove of one bevel gear so as to be in contact with both side surfaces of the tooth groove, spaced apart from the base reference surface by a predetermined distance, parallel to the base reference surface and the first Hold in a state that it can move in a direction perpendicular to the rotation axis of the gear body, and fit the tip of the measuring element to one tooth groove of the first bevel gear so as to contact both side surfaces of the tooth groove. In the inserted state, the first gear body is rotated, and the first advancement amount minimum value for measuring the first gear distance based on a minimum value of the advancement amount of the probe that changes with the rotation. In any of paragraphs (1) to (3), including a dependency measurement process Way with the gear body assembly.

  The mode described in this section is a mode related to the improvement of the first gear distance measurement. In the first gear distance measurement described in this section, in short, the first bevel gear is rotated with the tip of the measuring element fitted in the tooth groove of the first bevel gear, and the tooth This is a mode in which the first gear distance is measured based on the measured value in the state where the groove is closest to or farthest from the substrate reference surface. In the conventional measurement described above, the tip of the measuring element is sequentially brought into contact with both side surfaces of the tooth gap, and two measurements of the respective rotation angle values of the first gear body at the time of contact with the respective side surfaces are performed. The first gear distance was measured by calculating according to a predetermined calculation formula based on the value. On the other hand, according to the measurement of this section, it is possible to perform measurement based on one measurement value, which is a minimum value, and it is possible to quickly measure the first gear distance. Furthermore, when measuring a plurality of tooth gaps, the merit of the measurement in this section, which is quickness, can be fully enjoyed. Moreover, in the conventional measurement, the calculation process according to a predetermined calculation formula is performed. If the shape of the side surface of the tooth gap is complicatedly curved, this calculation formula is considerably complicated from the viewpoint of ensuring measurement accuracy. As a result, the setting operation of the calculation formula has to be a considerable burden. On the other hand, according to the measurement of this section, since the complicated calculation is not required, the accurate first gear distance can be easily measured.

(11) A second gear body having a second bevel gear that meshes with the first bevel gear on a base body on which the first gear body having the first bevel gear has already been rotatably assembled, In connection with the assembly operation in a state where the rotation axis of the first gear body intersects with the rotation axis of the first gear body at a right angle, from the second gear body reference plane set at a right angle to the rotation axis of the second gear body, A gear position measuring device for measuring a second gear distance, which is a distance to a set meshing reference position set as a reference for meshing of the second bevel gear with the first bevel gear. ,
Simultaneously in a state where the measurement reference surface and the respective front end portions are located on one circumference parallel to the measurement reference surface and are in contact with both side surfaces of the second bevel gear to different tooth spaces. A measuring instrument having three or more measuring elements to be fitted;
The measuring tool is held in a state in which the position variation is allowed in the rotational axis direction of the second gear body and in the plane intersecting the rotational axis, and the measuring tool and the second bevel gear are attached to each other. A measuring instrument bevel-shaped gear abutment device that abuts in the rotational axis direction of the second bevel-shaped gear in an urging state;
A separation distance measuring device for measuring a separation distance between the measurement reference surface of the measuring tool and the second gear body reference surface;
A gear position measuring device comprising: a second gear distance recognition device that recognizes the second gear distance based on the separation distance measured by the separation distance measuring device.

(12) The measuring tool bevel gear contact device is configured to hold the measuring tool in a state in which the measuring tool is allowed to rotate around the rotation axis of the second gear body, and the gear position measuring device includes the first gear position measuring device. 2 is configured to include a gear body rotating device that rotates the second gear body about its rotation axis in a state where the bevel gear and the measuring tool are in contact with each other. In the rotational state of the second gear body, the separation distance can be measured continuously or intermittently,
The second gear distance recognition device recognizes the second gear distance based on a plurality of values of the separation distance measured in a set rotation angle range of the second bevel gear (11) The gear position measuring device according to item.

(21) A second gear body having a second bevel gear that meshes with the first bevel gear on a base body on which the first gear body having the first bevel gear has already been rotatably assembled, In relation to the assembling operation in a state where the rotation axis of the first gear body intersects with the rotation axis of the first gear body at a right angle, the second gear body is assembled at a right angle to the assembly axis which is the rotation axis in the assembled state. A first gear distance, which is a distance from a set base reference surface to a set meshing reference position set as a reference for meshing of the first bevel gear with the second bevel gear, is measured. A gear position measuring device for
An advance amount measuring device that has a probe that can be advanced and retracted and is biased in the advance direction, and measures the advance amount of the probe,
The advancing amount measuring device has an attitude in which the advancing direction of the measuring element is a direction in which the assembly axis extends, and the tip of the measuring element is inserted into one tooth groove of the first bevel gear. It is fitted in contact with both side surfaces of the groove, is spaced apart from the base reference surface by a predetermined distance, and is movable parallel to the base reference surface and perpendicular to the rotation axis of the first gear body. A measuring instrument holding mechanism for holding in a state;
A gear body rotating device for rotating the first gear body;
Recognizing the minimum value in the change of the advancement amount of the probe measured by the advancement amount measuring instrument with the rotation of the first gear body, and certifying the first gear distance based on the recognized minimum value. A gear position measuring device configured to include a first gear distance recognition device.

  The gear position measuring device according to the above three aspects is a device suitable for measuring the first gear distance or the second gear distance described above. Since the description regarding these apparatuses overlaps with the description made in the aspect regarding the previous assembling method, it will be omitted here.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition to the following examples, the present invention is implemented in various modes including various modes modified and improved based on the knowledge of those skilled in the art, including the mode described in the above [Mode of Invention]. be able to.

<Working object in this embodiment>
The gear body assembling method of the embodiment of the present invention shares part of the assembly work of the final reduction gear for a vehicle. The final reduction gear is shown in FIGS. FIG. 1 is a sectional view, and FIG. 2 is an exploded view of the section. The final reduction gear 10 that is a gear assembly is a first carrier body that is a differential carrier 12 (hereinafter also referred to as “carrier 12”) as a base body and two gear bodies that are rotatably assembled to the carrier 12. A drive pinion 14 as a gear body (hereinafter sometimes referred to as “pinion 14”) and a differential assembly 16 as a second gear body (hereinafter sometimes referred to as “diff Assy 16”); In a state where the pinion 14 and the differential assembly 16 are assembled, their rotational axes intersect at a right angle.

  The carrier 12 includes a carrier body 20 and a carrier lid 22 coupled to the carrier body 20, and the pinion 14 is assembled in an assembly hole 24 provided in the carrier body 20. The pinion 14 includes a shaft portion 26 and a gear portion 28 as a first bevel gear provided integrally with the shaft portion 26 at one end portion of the shaft portion 26. The other end side is a spline portion 30 having a spline formed on the outer periphery. The pinion 14 is held by the carrier body 20 via the two angular tapered roller bearings 32 and 34 so that the pinion 14 is supported by the carrier 12 around the axis extending in the horizontal direction in the figure. It is assembled so that it can rotate.

  The differential assembly 16 includes a differential device 40 and a ring gear 42 as a second bevel gear, and the differential device 40 includes a differential mechanism composed of a differential small gear and a differential large gear. (Not shown) and a differential case 46 (hereinafter, also referred to as “difference case 46”) in which the differential gear is incorporated and the ring gear 42 is fixed to the outer periphery. The differential case 46 is coaxially provided with output shaft insertion portions 48 and 50 into which one end portion of the output shaft to the left and right drive wheels is inserted on each of the lower side and the upper side in the drawing. On the other hand, each of the carrier body 20 and the carrier lid 22 is provided with bearing fitting portions 52 and 54, and in each of the bearing fitting portions 52 and 54, the output shaft insertion portion 48 of the differential case 46, Since each of 50 is held via side bearings 56 and 58 which are angular tapered roller bearings, the differential assembly 16 is assembled to the carrier 12 so as to be rotatable about an assembly axis extending in the vertical direction in the figure. Yes. In addition, between the upper surface of the bearing fitting portion 52 of the carrier body 20 and the lower surface of the side bearing 56 and between the lower surface of the bearing fitting portion 54 of the carrier lid 22 and the upper surface of the side bearing 58, An annular shim 60, 62 is interposed.

  As described above, in a state where the pinion 14 and the differential assembly 16 are assembled to the carrier 12, the gear portion 28 of the pinion 14 and the ring gear 42 included in the differential assembly 16 are in mesh with each other, and the gear of the pinion 14 is engaged. The part 28 functions as a reduction small gear as an input gear in the final reduction gear 10, and the ring gear 42 functions as a reduction large gear. Further, in a state where the pinion 14 and the differential assembly 16 are assembled, the rotational axis of the pinion 14 and the rotational axis of the differential assembly 16 intersect at a right angle. Note that the gear portion 28 and the ring gear 42 of the pinion 14 are hypoid gears which are a kind of bevel gear, and their two rotation axes are in a torsional position and are three-dimensionally intersecting. It has become.

  In the following description, when the bearing fitting portions 52 and 54 and the side bearings 56 and 58 are referred to separately, “main body side bearing fitting portion 52”, “lid side bearing fitting portion 54”, “main body side”. These may be referred to as “side bearings 56” and “lid side bearings 58”.

  As shown in the exploded view of FIG. 2, in the assembly work using the final reduction gear 10 as an object, the differential assembly member 16 and the carrier lid 22 are attached to the intermediate assembly 70 in which the pinion 14 has already been assembled to the carrier body 20. Assembly work is performed. In this assembling work, in order to bring the gear portion 28 of the pinion 14 and the ring gear 42 of the differential assembly 16 into an appropriate meshing state in consideration of an appropriate amount of backlash and the like, the assembly of the differential assembly 16 to the carrier 12 in the rotational axis direction is performed. The position needs to be appropriate. In the final reduction gear 10, the proper assembly position of the differential assembly 16 with respect to the carrier 12 is determined by setting the shims 60 and 62 to appropriate thicknesses.

<Configuration of proper assembly position determination system>
The above-described determination of the proper assembly position is performed by an appropriate assembly position determination system including a gear distance measuring device that is an embodiment of the present invention. FIG. 3 shows a schematic diagram of the proper assembly position determination system. The proper assembly position determination system includes an intermediate assembly measuring device 100 that performs a measurement operation of the intermediate assembly 70 to which the pinion 14 is assembled, a differential assembly measurement device 102 that performs a measurement operation of the differential assembly 16, and a measurement of the carrier lid 22. The carrier lid measuring device 104 that performs the above and the control device 106 that controls the operation of these measuring devices. The control device 106 is mainly a computer, to which sensors (described in detail later) provided in the measuring devices 100, 102, and 104 are connected, and the data detected by these sensors is used. Obtaining and determining the proper assembly position based on the data and the like. These sensors are such that the tip portion can be moved back and forth with respect to the sensor body and urged in the advance direction, and the data is detected based on the advance amount of the probe.

  FIG. 4 shows a main part of the intermediate assembly measuring apparatus 100. The intermediate assembly measuring device 100 includes a measuring device main body (not shown), a unit vertical cylinder device 110 fixed above the measuring device main body, and a measuring unit 112 moved up and down by the unit vertical cylinder device 110. , And a pinion rotating device 114 that rotates the pinion 14 around the rotation axis. In FIG. 4, the intermediate assembly 70 supported by the pallet 116 having an L-shaped cross section is fixed at the measurement work position of the measurement device main body, and the measurement unit 112 is fixed to the carrier main body 20 by the unit vertical cylinder device 110. It shows a state where it is lowered until it comes into contact with the mating surface with the carrier lid 22 and measurement work is performed.

  The measurement unit 112 includes a substrate 120 fixed to the lower end portion of the cylinder rod of the unit vertical cylinder device 110, and a reference plate 124 that is supported by a column (support) 122 below the substrate 120 and whose lower surface serves as a measurement reference surface. And a carrier measuring tool 126 and a pinion measuring tool 128 which are two measuring tools fixed to the reference plate 124. The carrier measuring tool 126 has two position sensors 130 and 132, and these position sensors 130 and 132 are fixedly supported by a sensor support member 134 that is suspended and fixed from the reference plate 124. Specifically, the position sensors 130 and 132 are positioned so as to face each other across the assembly axis, and when the measurement unit 112 is moved downward, each of the front ends of the position sensors 130 and 132 is The main body side bearing fitting portion 52 is fixedly supported at a position where the main body side bearing fitting portion 52 abuts on the upper surface.

  Further, the pinion measuring tool 128 will be described with reference to FIG. 5 (A-A cross section in FIG. 4), which is a view of the pinion measuring tool 128 from the left side of FIG. The pinion measuring tool 128 mainly includes a displacement sensor 142 having a measuring element 140 and is held by a sensor holding mechanism 144 that is a component of the pinion measuring tool 128. The sensor holding mechanism 144 includes a slider 148 that is movable along a guide rail 146 that extends in a direction perpendicular to the rotation axis of the pinion 14 (the left-right direction in FIG. 5) on the upper surface of the reference plate 124, and the slider 148 A holder 150 that is fixed and holds the displacement sensor 142, and a cylindrical member that is fixed to the slider 148. The displacement sensor 142 is inserted through the holder 150, and is allowed to move in the vertical direction, which is the direction in which the assembly axis extends. A guide cylinder 152 and a sensor vertical cylinder device 154 capable of moving the displacement sensor 142 in the vertical direction are configured. In other words, the displacement sensor 142 is in a posture in which the advancement direction of the probe 140 is in the direction in which the assembly axis extends in the sensor holding mechanism 144 and the tip of the probe 140 is a predetermined distance from the lower surface of the reference plate 124 to the lower side. In addition to being spaced apart, they are held so as to be movable in a direction parallel to the reference plate 124 and perpendicular to the rotational axis of the pinion 14. The position of the displacement sensor 142 in the left-right direction in FIG. 5 is positioned at the position of the displacement sensor 142 in the normal state by the coil spring 156 disposed between the sensor holding mechanism 144 and the reference plate 124. . Incidentally, a tooth gap detection sensor 158 is fixed to the lower surface of the reference plate 124, and the tooth gap detection sensor 158 detects the tooth gap of the pinion 14 and transmits a signal to that effect. Yes.

  The pinion rotating device 114 includes an advance / retreat cylinder device 170 fixed to the measuring device main body, and an electric motor 172 that is advanced / retreated by the advance / retreat cylinder device 170. The electric motor 172 has a spline socket 174 fixedly attached to the main shaft of the electric motor 172 and engageable with the spline portion 30 of the pinion 14. It is possible to engage and rotate the pinion 14 around the rotation axis.

  FIG. 6 shows a main part of the differential assembly measuring apparatus 102. The differential assy measurement device 102 includes a measurement device main body (not shown), an upper device 200 disposed above the measurement device main body, an upper device upper / lower cylinder device 202 that moves the upper device 200 up and down, and a measurement device. A substrate 204 provided at the lower portion of the main body, a lower holder 206 fixed to the substrate 204 and holding the lower portion of the differential assembly 16, and a ring gear rotating device 208 that rotates the ring gear 42 about the rotational axis of the differential assembly 16. It consists of Further, the upper device 200 includes an upper holder 210 that is fixed to the lower end portion of the cylinder rod of the upper device upper / lower cylinder device 202 and holds the upper portion of the differential assembly 16. Each of the upper holder 210 and the lower holder 206 has holding portions 212 and 214 formed so that outer races of side bearings can be fitted therein, and the main body side bearing 56 and the lid side bearing. Each outer race of 58 is fixedly held. That is, the differential Assy 16 is held by the differential Assy measuring device 102 via the side bearings 56 and 58 by the two holders 206 and 210. FIG. 6 shows a state in which the differential assembly 16 is held only by the lower holder 206, and shows a state before the start of measurement work.

  The upper device 200 includes, in addition to the upper holder 210 described above, a differential Assy measurement unit 220 that performs measurement of the differential assembly 16, and the differential assembly measurement unit 220 includes five measuring elements 222. An annular measuring tool 224 fixed so that a lower end portion, which is a tip portion, is located on one circumference, and a generally cylindrical holder 226 that holds the measuring tool 224 inside are configured. . The holder 226 is provided with a receiving portion 228 for receiving the measuring tool 224 below the holder 226, and the measuring tool 224 is placed on the lower surface of the receiving portion 228. The housing portion 228 is allowed to move upward with respect to the holder 226 of the measuring tool 224 by making the size in the axial direction larger than the thickness of the measuring tool 224, and the inner diameter of the housing portion 228 is measured. By making the shape slightly larger than the outer diameter of the tool 224, the position variation of the measuring tool 224 in the plane intersecting the rotational axis of the differential assembly 16 is allowed.

  The differential assembly measurement unit 220 includes three sensors 230, 232, and 234. One of the sensors 230 is a displacement sensor, and is fixedly supported in a state in which a front end portion of the sensor 230 protrudes from above the housing portion 228 of the holder 226. The displacement sensor 230 is adapted to abut on the upper surface of the measuring tool 224 and detect the displacement of the measuring tool 224 relative to the holder 226. The other two sensors 232 and 234 are position sensors, and are fixedly supported at positions facing each other across the axis on the side surface of the holder 226. Each of these position sensors 232 and 234 has two objects whose front ends are fixed to the lower holder 206 when the differential assembly measuring unit 220 to which they are fixedly supported is moved downward. The measurement member 236 is in contact with the upper end portion of each.

  The upper holder 210 has a shaft portion 240 extending in the rotation axis direction of the differential assembly 16. The differential assembly measurement unit 220 is externally fitted to the shaft portion 240 of the upper holder 210 in the holder 226, and the shaft It can slide along the portion 240. A unit vertical cylinder device 244, which is one of the components of the upper device 200, is disposed between the upper holder 210 and the differential assembly measurement unit 220. The Assy measuring unit 220 is moved up and down with respect to the upper holder 210. Note that the opening 246 on the housing portion 228 side of the holder 226 has substantially the same shape as the outer shape on the lower side of the upper holder 210 and is slightly larger than the outer shape. Therefore, the differential assembly measurement unit 220 is restricted from moving downward by the holder 226 being locked to the holding portion 212 of the upper holder 210 at the opening 246 thereof. Incidentally, before the measurement operation shown in FIG. 6, the differential Assy measurement unit 220 is positioned at the upward movement end with respect to the upper holder 210.

  The ring gear rotation device 208 is configured mainly by an electric motor 250 fixed to the substrate 204, and a pulley 252 is fixedly attached to the main shaft of the electric motor 250. On the other hand, a pulley 254 is rotatably attached to the lower holder 206 via a bearing 256, and a bolt for fixing a part of the differential assembly 16, specifically, the ring gear 42 to the differential case 46 is attached to the pulley 254. An engaging member 260 that can be engaged with is vertically installed. A belt 258 is wound around the pulley 252 and the pulley 254, and by rotating the electric motor 250, the rotational driving force is transmitted by the belt 258 and provided on the pulley 254 of the lower holder 206. The engagement member 260 is engaged with the differential assembly 16, and the ring gear 42 is rotated together with the differential device 40.

  FIG. 7 shows a main part of the carrier lid measuring device 104. The carrier lid measuring device 104 includes a measuring device main body (not shown), an upper and lower cylinder device 280 fixed above the measuring device main body, an upper holder 282 moved up and down by the upper and lower cylinder device 280, and a measurement. And a lower holder 284 fixed below the apparatus main body. In the upper holder 282, when the two position sensors 286 and 288 are opposed to each other across the assembly axis, and the upper holder 282 is moved downward, the position sensors 286 and 288 are located. Are fixedly supported at positions where they contact the lid-side bearing fitting portion 54. In FIG. 7, the upper holder 282 is lowered by the upper and lower cylinder device 280 until it comes into contact with the mating surface of the carrier lid 22 with the carrier body 20, and the carrier lid 22 is moved to the upper holder 282 and the lower holder. It shows a state where the measurement work is performed by being sandwiched by 284.

<Measurement work by intermediate assembly measuring device>
Hereinafter, the measurement work using each measuring device 100, 102, 104 will be described. Measurement by the intermediate assembly measuring apparatus 100 is started after the intermediate assembly 70 supported by the pallet 116 is fixed to the measuring apparatus main body. First, the electric motor 172 is moved forward by the forward / backward cylinder device 170 and connected to the pinion 14, and the measurement unit 112 is moved downward by the unit vertical cylinder device 110. In the measurement unit 112, the reference plate 124 has a mating surface with the carrier lid 22 of the carrier body 20 as a substrate reference surface as shown in FIG. 4 (hereinafter sometimes referred to as “substrate reference surface a”). Until it is pressed. In this state, the position sensors 130 and 132 of the carrier measuring tool 126 are brought into contact with the upper surface of the bearing fitting portion 52 as another substrate reference surface (hereinafter also referred to as “substrate reference surface b”). Measurement by the position sensors 130 and 132 is performed. Data detected by the position sensors 130 and 132 is sent to the control device 106, and the average value of the detected data is set as the inter-surface distance L1 between the two substrate reference surfaces a and b.

  On the other hand, in the above state, the displacement sensor 142 of the pinion measuring tool 128 is positioned at the upper moving end by the sensor upper / lower cylinder device 154, and the measuring element 140 is positioned above the gear portion 28 of the pinion 14. ing. FIG. 8 shows the positional relationship between the probe 140 and the pinion 14 at the time of measurement by the pinion measuring tool 128. After the electric motor 172 is connected to the pinion 14, the pinion 14 is rotated by the electric motor 172, and the pinion 14 stops rotating based on the detection result of the tooth gap detection sensor 158, and the measuring element 140 is moved to the teeth. It is located at a position where it can easily enter the groove. Then, after the above-described downward movement of the measurement unit 112 is completed, the displacement sensor 142 is moved downward by the sensor upper / lower cylinder device 154, and the measuring element 140 is inserted into the tooth groove of the pinion 14 on both sides of the tooth groove. It is fitted so as to come into contact with the surface and is in a state in which it can advance and retreat (see FIG. 8A). Next, the pinion 14 is rotated counterclockwise in the drawing, and the tip of the measuring element 140 is completely fitted so as to be surely in contact with both side surfaces of the tooth gap (FIG. 8). (See (b)). Subsequently, the pinion 14 is rotated in the direction opposite to the previous rotation (clockwise in the figure) in the figure, and measurement by the displacement sensor 142 is performed (see FIG. 8C). As the pinion 14 rotates, the pinion measuring tool 128 having the displacement sensor 142 moves along the guide rail 146 while the probe 140 urged in the advance direction is fitted in the tooth gap. Therefore, in the movement, the amount of advance of the measuring element 140 changes as shown in the figure. Then, from the data of the advance amount detected by the displacement sensor 142, the control device 106 reads data that minimizes the advance amount. Further, in the tooth gap at the position where the pinion 14 is rotated by 180 °, the same measurement as described above is performed, and data with which the advancement amount of the probe 140 is minimized is read. A first gear distance that is a distance from the base reference surface a to the set meshing reference position of the pinion 14 (referred to as “first set meshing reference position” in the drawing) based on the average value of the minimum values of the two advance amounts. L2 is required.

  With the structure as described above, in the intermediate assembly measuring apparatus 100, the displacement sensor 142 is used as the advance amount measuring device, the sensor holding mechanism 144 that holds the displacement sensor 142 is used as the measuring device holding mechanism, and the pinion rotating device 114 is used as the first measuring device. It functions as a gear body rotating device that rotates the gear body. Further, the control device 106 recognizes the minimum value in the change accompanying the rotation of the pinion 14 of the advancement amount of the probe 140 detected by the displacement sensor 142, and sets the first gear distance based on the recognized minimum value. It functions as a first gear distance recognition device to be authorized. The first gear position measuring device for measuring the first gear distance is configured including the advance amount measuring device, the measuring device holding mechanism, the gear body rotating device, the first gear distance recognition device, and the like. Since the gear body assembling method of the present embodiment uses the first gear position measuring device, the first gear position measuring step is performed based on the minimum value of the advancement amount of the probe in the first gear distance measuring step. A measuring element advance amount minimum value-based measurement process for measuring the gear distance is executed. According to the gear assembling method of the present embodiment, measurement can be performed based on one measurement value called the minimum value, and the first gear distance can be measured easily and quickly.

<Measurement work with differential assembly measuring device>
As shown in FIG. 6, the measurement by the differential assembly measuring apparatus 102 is performed by holding the differential assembly assembly 16 to which the two side bearings 56 and 58 are attached, specifically the outer race of the lid side bearing 58 by the lower holder 206. Will be started later. First, the upper device 200 is moved downward by the upper device upper / lower cylinder device 202, and the outer race of the main body side bearing 56 is fixedly held by the upper holder 210, whereby the differential assembly 16 is held. The upper device 200 is further subjected to a downward load by the upper device upper / lower cylinder device 202, and the differential Assy 16 is loaded with a preload similar to the preload in the state where it is actually assembled to the carrier 12. Is done. Further, in this state, by rotating the electric motor 250 and rotating the ring gear 42, that is, the differential assembly 16, the inclination of the rotation axis thereof is removed, and the state shown in FIG. 9 is obtained.

  Next, the differential assembly measurement unit 220 is lowered to the lower moving end with respect to the upper holder 210 by the unit vertical cylinder device 244, and the state shown in FIG. 10 is obtained. In this state, the differential assembly measurement unit 220 is locked to the upper holder 210, and the three sensors 230, 232, and 234 included in the differential assembly measurement unit 220 are the end surfaces of the holding unit 242 of the upper holder 210. It is supposed to measure the distance with reference to. That is, the distance from the end surface of the main body side bearing 56 as the second gear body reference surface (hereinafter sometimes referred to as “second gear body reference surface a”) is detected. In the state shown in FIG. 10, the position sensors 232 and 234 are brought into contact with the member to be measured 236 of the lower holder 206, and the measurement is performed by the position sensors 232 and 234, and the detected data is controlled. Sent to device 106. The member to be measured 236 is an end surface of a portion of the lower holder 206 that holds the lid-side side bearing 58, that is, an end surface of the lid-side side bearing 58 as a second gear body reference surface (hereinafter referred to as “second gear body”). A reference plane b), and a distance L3 between the two second gear body reference planes a and b based on the average value of the detection data of the position sensors 232 and 234. Is required.

  Further, when the differential assy measurement unit 220 is lowered by the unit vertical cylinder device 244 from the state shown in FIG. 9, the differential Assy 16 is slowly rotated by the ring gear rotation device 208. As the differential assembly measurement unit 220 is lowered, the measuring tool 224 is placed on the ring gear 42 and only the holder 226 is lowered. Since the measuring tool 224 placed on the ring gear 42 is rotated by the differential assembly 16, the five measuring elements 222 are fitted into the tooth grooves of the ring gears 42 different from each other in contact with both side surfaces of the tooth groove. It will be. Further, since the ring gear 42 and the measuring tool 224 are biased to each other by the weight of the measuring tool 224, the measuring tool 224 is guided by the tooth gap and the center of the measuring tool 224 is measured. Automatic alignment of the axis and the rotation axis of the differential assembly 16 is performed.

  In the state where the holder 226 of the differential assembly measurement unit 220 shown in FIG. 10 is lowered to the lower movement end, the tip of the displacement sensor 230 is brought into contact with the upper surface of the measuring tool 224, and measurement by the displacement sensor 130 is performed. Is called. The displacement sensor 130 continuously detects data while the rotation of the differential assembly 16 exceeds one round. The control device 106 reads the maximum value and the minimum value from the data, and the average value thereof is set as the separation distance between the second gear body reference surface a and the upper surface of the measuring tool 224 as the measurement reference surface. The Based on the obtained separation distance, a second gear distance L4, which is a distance from the second gear body reference plane a to the set engagement reference position of the ring gear 42 (referred to as “second set engagement reference position” in the drawing), It is required.

  In the differential Assy measuring device 102 including the measuring tool 224 having the five measuring elements 222, the holder 226 of the differential Assy measuring unit 220 and the structure in which the measuring tool 224 is accommodated in the holder 226 are configured as described above. In addition, a measuring tool bevel gear contact device is configured, and the displacement sensor 130 functions as a separation distance measuring device that measures the separation distance of the measuring tool 224. Further, the control device 106 functions as a second gear distance recognition device that recognizes the second gear distance based on the separation distance measured by the separation distance measuring device. The second gear position measuring device for measuring the second gear distance is configured including the measuring tool 224, the measuring tool bevel gear contact device, the second vehicle distance recognition device, and the like. Further, the second gear position measurement device includes a ring gear rotation device 208 that functions as a gear body rotation device that rotates the differential gear assembly 16 that is the second gear body around the rotation axis, and the rotation state of the differential assembly 16 The second gear distance is recognized based on a plurality of values of the separation distance continuously measured in step (b). Since the gear body assembling method of the present embodiment uses the second gear position measuring apparatus as described above, a measuring tool having a plurality of measuring elements is used in the second gear distance measuring step. At the same time, a multi-measurement-member measuring process for measuring the second gear distance based on the measured values of the plurality of separation distances measured while rotating the second gear body is executed. According to the gear assembling method of the present embodiment, even if there is a tooth formation error or the like in the teeth of the second bevel gear, it is possible to accurately measure the second gear distance by absorbing the error. In addition, in order to measure the second gear distance based on the realization of the automatic alignment between the center axis of the measuring tool and the second gear body and the plurality of measured values measured while rotating the second gear body, Highly accurate measurement is possible.

<Measurement work with carrier lid measuring device>
The measurement by the carrier lid measuring device 104 is started after the carrier lid 22 is held by the lower holder 284. The upper holder 282 is moved downward by the upper and lower cylinder device 280, and the lower surface of the upper holder 282 is the mating surface of the carrier lid 22 with the carrier body 20 (hereinafter referred to as “base reference surface c”). ”). The state is the state shown in FIG. 7, and in this state, the position sensors 286 and 288 fixed to the upper holder 282 are the end surfaces of the lid-side bearing fitting portion 54 as another base reference surface (hereinafter, referred to as “base sensors”). The measurement is performed by the position sensors 286 and 288. Data detected by the position sensors 286 and 288 is sent to the control device 106, and an average value of the detected data is set as an inter-surface distance L5 between the two substrate reference surfaces c and d. Incidentally, in the state where the final reduction gear 10 is assembled, the base body reference surface a and the base body reference surface c are combined (see FIG. 1).

<Proper assembly position determination process>
In the control device 106, based on L1 to L5 obtained in the measurement operation including the first gear distance measurement step and the second gear distance measurement step described above, the main body side bearing fitting portion 52 and the main body side bearing 56 The proper separation distance Sb and the proper separation distance Sp between the lid-side bearing fitting portion 54 and the lid-side side bearing 58 are obtained by the following equations. Each of the appropriate separation distances Sb and Sp is the thickness of each of the shims 60 and 62, and the proper assembly position in the rotational axis direction of the differential assembly 16 with respect to the carrier 12 is determined. In the following equation, α is a value obtained from the separation distance between the measured meshing position and the meshing position in a state where an appropriate amount of backlash exists, and varies depending on the size of the measuring element, the width of the tooth gap, and the like. Is.
Sb = (L1-L2) -L4-α (1)
Sp = (L1 + L5) -L3-Sb (2)

It is sectional drawing which shows a final reduction gear device with the work target object of an Example. It is an exploded view in the section of the final reduction gear shown in FIG. It is the schematic of a suitable assembly | attachment position determination system provided with the gear distance measuring apparatus of an Example. It is a figure which shows the principal part of the intermediate assembly measuring apparatus in FIG. It is a figure (AA cross section in FIG. 4) which expands and shows the pinion measuring tool in FIG. It is a figure which shows the principal part of the differential Assy measuring apparatus in FIG. 3, and is a figure which shows the state before starting a control action. It is a figure which shows the principal part of the carrier lid measuring apparatus in FIG. It is a figure which shows the positional relationship of a measuring element and a drive pinion at the time of the measurement by the pinion measuring tool in FIG. It is a figure which shows the principal part of the differential assembly measuring apparatus in FIG. 3, and is a figure which shows the state operated until the differential assembly was hold | maintained. It is a figure which shows the principal part of the differential Assy measuring apparatus in FIG. 3, and is a figure which shows the state in which the measurement operation | work is performed.

Explanation of symbols

10: Final reduction gear 12: Differential carrier (base) 14: Drive pinion (first gear body) 16: Differential assembly (second gear body) 20: Carrier body 22: Carrier lid 28: Gear portion (first umbrella shape) 42) Ring gear (second bevel gear) 52: Body side bearing fitting portion 54: Cover side bearing fitting portion 56: Body side bearing 58: Cover side bearing 60: Shim 62: Shim 70: Intermediate Assembly 100: Intermediate assembly measurement device 102: Differential assembly measurement device 104: Carrier lid measurement device 106: Control device (first gear distance distance recognition device, second gear distance recognition device) 114: Pinion rotation device (gear body rotation) 130): Position sensor 132: Position sensor 140: Measuring element 142: Displacement sensor (advance amount measurement) 144: Sensor holding mechanism (measuring device holding mechanism) 208: Ring gear rotating device (gear body rotating device) 222: Measuring element (five) 224: Measuring tool 230: Displacement sensor 232: Position sensor 234: Position sensor 286: Position Sensor 288: Position sensor

Claims (6)

A second gear body having a second bevel gear that meshes with the first bevel gear is rotated on a base on which the first gear body having the first bevel gear has already been rotatably assembled. A gear body assembling method for assembling in a state where an axis intersects with a rotation axis of the first gear body at a right angle,
Engagement of the first bevel-shaped gear with the second bevel-shaped gear from a base reference plane set at a right angle to the assembly axis that is the rotation axis of the second gear body in the assembled state A first gear distance measuring step for measuring a first gear distance that is a distance to a set meshing reference position set as a reference of
Set meshing set as a reference for meshing of the second bevel gear with the first bevel gear from a second gear body reference plane set perpendicular to the rotation axis of the second gear body A second gear distance measuring step for measuring a second gear distance that is a distance to the reference position;
An appropriate separation distance between the base reference surface and the second gear body reference surface based on the first gear distance and the second gear distance measured in the first gear distance measuring step and the second gear distance measuring step. And an appropriate assembly position determining step for determining an appropriate assembly position in the rotation axis direction of the second gear body with respect to the base based on the appropriate separation distance,
Three or more of which the respective front end portions are located on one circumference parallel to the measurement reference surface and are simultaneously fitted in different tooth spaces of the second bevel gear while being in contact with both side surfaces of the tooth spaces. The measuring tool having the measuring element and the second bevel-shaped gear are brought into contact with each other in the rotational axis direction of the second bevel-shaped gear in a state where they are urged to each other, and Based on the separation distance between the measurement reference surface and the second gear body reference surface, a multi-measurement member measuring step for measuring the second gear distance;
A measuring instrument having a probe that can be advanced and retracted and biased in the advancing direction is positioned so that the advancing direction of the measuring element is a direction in which the assembly axis extends. In a state of being fitted into one tooth groove of one bevel gear so as to be in contact with both side surfaces of the tooth groove, spaced apart from the base reference surface by a predetermined distance, parallel to the base reference surface and the first Hold in a state that it can move in a direction perpendicular to the rotation axis of the gear body, and fit the tip of the measuring element to one tooth groove of the first bevel gear so as to contact both side surfaces of the tooth groove. In the inserted state, the first gear body is rotated, and the first advancement amount minimum value for measuring the first gear distance based on a minimum value of the advancement amount of the probe that changes with the rotation. At least one of the reliance measurement process, The gear body assembling method, wherein the gear body assembling method is performed in at least one of the second gear distance measuring step and the first gear distance measuring step capable of executing one.   The gear body assembling method according to claim 1, wherein at least the measuring element utilization measuring step is executed in the second gear distance measuring step.   The gear body assembling method according to claim 1, wherein at least the measuring element advance amount minimum value dependence measuring step is executed in the first gear distance measuring step.   2. The gear according to claim 1, wherein the multiple probe use measurement step is executed in the second gear distance measurement step, and the probe advance amount minimum value dependence measurement step is executed in the first gear distance measurement step. Body assembly method. A second gear body having a second bevel gear that meshes with the first bevel gear is rotated on a base on which the first gear body having the first bevel gear has already been rotatably assembled. In relation to the assembly operation in a state where the axis intersects with the rotation axis of the first gear body at a right angle, the second gear body from the second gear body reference plane set at a right angle to the rotation axis of the second gear body. A gear position measuring device for measuring a second gear distance which is a distance to a set meshing reference position set as a meshing reference of the bevel gear of the first bevel gear,
Simultaneously in a state where the measurement reference surface and the respective front end portions are located on one circumference parallel to the measurement reference surface and are in contact with both side surfaces of the second bevel gear to different tooth spaces. A measuring instrument having three or more measuring elements to be fitted;
The measuring tool is held in a state in which the position variation is allowed in the rotational axis direction of the second gear body and in the plane intersecting the rotational axis, and the measuring tool and the second bevel gear are attached to each other. A measuring instrument bevel-shaped gear abutment device that abuts in the rotational axis direction of the second bevel-shaped gear in an urging state;
A separation distance measuring device for measuring a separation distance between the measurement reference surface of the measuring tool and the second gear body reference surface;
A gear position measuring device comprising: a second gear distance recognition device that recognizes the second gear distance based on the separation distance measured by the separation distance measuring device. A second gear body having a second bevel gear that meshes with the first bevel gear is rotated on a base on which the first gear body having the first bevel gear has already been rotatably assembled. In relation to the assembly operation in a state where the axis intersects with the rotation axis of the first gear body at a right angle, the assembly is set at a right angle to the assembly axis serving as the rotation axis of the second gear body in the assembled state. A gear for measuring a first gear distance, which is a distance from a base reference surface to a set meshing reference position set as a reference for meshing of the first bevel gear with the second bevel gear. A position measuring device,
An advance amount measuring device that has a probe that can be advanced and retracted and is biased in the advance direction, and measures the advance amount of the probe,
The advancing amount measuring device has an attitude in which the advancing direction of the measuring element is a direction in which the assembly axis extends, and the tip of the measuring element is inserted into one tooth groove of the first bevel gear. It is fitted in contact with both side surfaces of the groove, is spaced apart from the base reference surface by a predetermined distance, and is movable parallel to the base reference surface and perpendicular to the rotation axis of the first gear body. A measuring instrument holding mechanism for holding in a state;
A gear body rotating device for rotating the first gear body;
Recognizing the minimum value in the change of the advancement amount of the probe measured by the advancement amount measuring instrument with the rotation of the first gear body, and certifying the first gear distance based on the recognized minimum value. A gear position measuring device configured to include a first gear distance recognition device.

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