JP4591663B2 - Side shim selection method and side shim selection device for differential carrier assembly - Google Patents

Description

  The present invention relates to a side shim selection method and a side shim selection device for a differential carrier assembly, and more particularly, a method for selecting a thickness of a side shim incorporated for adjusting backlash between a drive pinion gear and a ring gear, and selection of the thickness of the side shim. It is related with the apparatus for doing.

  Generally, in a differential carrier assembly, a drive pinion gear is provided at one end of a drive pinion shaft that is rotatably supported by the carrier, and a ring gear fixed to a flange of the differential case subassembly is meshed with the drive pinion gear. In such a differential carrier assembly, the shaft portions at both ends of the case subassembly are rotatably supported by the carrier via a pair of side bearings. Further, in the differential carrier assembly, each side shim is assembled between each side bearing and each bearing support portion in which each side bearing is accommodated, and the thickness of each side shim is adjusted, so that the drive pinion gear and the ring gear are adjusted. And backlash is adjusted. There are various forms of techniques for selecting a side shim having an appropriate thickness when adjusting the backlash between the drive pinion gear and the ring gear.

  For example, Patent Document 1 discloses a thickness that prevents the differential case subassembly from reaching the relative movement limit between the side bearing outer race and the side bearing assembly end surface in the direction in which the differential case subassembly approaches the relative movement limit. A step of measuring the distance L2 of the differential case subassembly when a load is applied so as to press the master shim, and the other side bearing assembly end surface and the side bearing outer race are pressed. A step of measuring the distance L1 of the differential case sub-assembly when a load is applied to the center, and a step of measuring the distance L3 of the differential case sub-assembly when the load is applied so that the differential case sub-assembly reaches a relative movement limit. Drive pinion gear A shim selection method for obtaining an average value of the distances L1, L2, and L3 at the time of rotation and selecting a shim based on the average values of the distances L1, L2, and L3 (hereinafter, a conventional shim selection method) Is disclosed).

However, in the above-described conventional shim selection method, each centering shaft of the shim selection device is fitted in the shaft hole of each shaft portion of the differential case subassembly with an inlay, and the differential case subassembly is supported by the shim selection device. The relative position of the shaft center line of the differential case subassembly with respect to each centering shaft of the selection device is not stable. As a result, repeated measurement values of the distances L1, L2, and L3 vary, and as a result, shim selection results also vary. Further, in the conventional shim selection method, the axial center line of the differential case subassembly is offset with respect to each bearing support portion of the carrier. The amount by which the differential case subassembly is offset depends on the shim selection device and each component. Since variations occur depending on the accuracy, shim selection results vary due to the variations, making it difficult to select an appropriate side shim.
JP-A-11-182653 (paragraph numbers 0012 to 0026, FIG. 3)

  Therefore, the present invention has been made in view of the above circumstances, and a first object is to provide a side shim selection method for a differential carrier assembly capable of selecting an appropriate side shim. The second object is to provide a side shim selection device for a differential carrier assembly that can select an appropriate side shim.

In order to achieve the first object, the invention according to claim 1 of the present invention is arranged on the carrier when adjusting the backlash between the drive pinion gear and the ring gear engaged with each other in the differential carrier assembly. The thickness of the first side shim that is assembled to the first shaft support portion that supports the first shaft portion on the opposite side of the differential case subassembly among the shaft support portions that support the shaft portions at both ends of the differential case subassembly. Sato, a Saidoshimu selection method of the differential carrier assembly and the thickness of the second Saidoshimu assembled to a second shaft support for supporting the second shaft portion of the flange side of the differential case subassembly, is selected, the the second axis together with the first Masutashimu is assembled to the first shaft support A step of second Masutashimu is assembled to part, the steps of the differential case subassembly is supported rotatably around the axial center line is centered, the first side attached to the first shaft portion while the action of the thrust direction of the bearing pressurizing the outer race outer surface of the bearing, said after the drive pinion gear is rotated, the differential case subassembly, the displacement in the axial center line direction relative to the carrier per revolution of the ring gear a step of average value L1 of is measured, while the action of the thrust direction of the bearing pressurizing the outer race outer surface of the second side bearing mounted on the second shaft portion, and is driven to rotate the drive pinion gear after, the differential case subassembly, the calibration of one rotation per the ring gear A step of average value L2 of the displacement in the axial center line direction is measured with respect to A, wherein the first shaft supporting said from the first and the second shaft support with Masutashimu is removed second Masutashimu is removed and steps, after each Masutashimu is removed, the outer race outer surface of the first side bearing by the action of the thrust direction of the bearing preload, and the said ring gear and said drive pinion gear to the non-back, in the state , said drive pinion gear is rotated, said differential case subassembly, comprising the steps of mean value L3 of the displacement in the axial center line direction is measured with respect to the carrier of one rotation per the ring gear, the steps of Configured and selected thickness of each side shim based on each measured average value L1, L2, L3 It is characterized by being.

According to a second aspect of the present invention, in the differential carrier assembly side shim selection method according to the first aspect, a pair of centering cones that can be moved closer to and away from each other are provided in each shaft hole formed in each shaft portion of the differential case subassembly. By engaging, the differential case sub-assembly is centered and supported so as to be rotatable around the axial center line.
A third aspect of the present invention is the differential carrier assembly side shim selection method according to the first or second aspect, wherein each shaft support portion of the carrier is formed by being divided into two in the radial direction of each shaft support portion. When the cone is engaged with each shaft hole formed in each shaft portion of the differential case subassembly, the differential case subassembly is offset by a predetermined distance in the dividing direction of each shaft support portion with respect to the axis of each shaft support portion. It is characterized by.
The invention according to claim 4 is the differential carrier assembly side shim selection method according to any one of claims 1 to 3, wherein the differential case subassembly is centered and the axial center line and one end of the differential case subassembly are centered. The distance from the other end face of the drive pinion shaft to which the drive pinion gear is mounted is measured, and the distance between the drive pinion gear mounting reference position and the axis of each shaft support portion of the carrier is derived based on the measurement result. Then, the contact between the drive pinion gear and the ring gear is evaluated based on the distance between the reference mounting position of the drive pinion gear and the axis of each shaft support portion of the carrier.

  In order to achieve the second object, the invention according to claim 5 of the present invention is a differential carrier assembly side shim selection device used in the differential carrier assembly side shim selection method according to claims 1 to 4. A master shim that is assembled to each shaft support portion of the carrier that supports the shaft portions at both ends of the differential case subassembly, and carrier fixing means for positioning and fixing the carrier in which the differential case subassembly is assembled at a normal position; With the carrier fixed by the carrier fixing means, the differential case subassembly is centered and supported so as to be rotatable around the axis center line, and both ends of the differential case subassembly supported by the support means A pair of attached to the shaft Bearing pressurizing means for applying thrust in the thrust direction to the id bearing, drive means for rotating the drive pinion gear to rotate the ring gear meshed with the drive pinion gear, and the shaft center line with respect to the carrier of the differential case subassembly The first measuring means for measuring the displacement in the direction, and the thickness of the first side shim assembled to the first shaft support on the opposite side of the carrier after the measurement result of the first measuring means is processed And calculating means for outputting the thickness of the second side shim assembled to the second shaft support on the flange side, the thickness of the first side shim and the thickness of the second side shim is obtained by the side shim selection device. It is selected.

According to a sixth aspect of the present invention, in the side shim selection device for the differential carrier assembly according to the fifth aspect, the support means is engaged with the respective shaft holes formed in the shaft portions at both ends of the differential case subassembly so as to mutually It is characterized by comprising a pair of centering cones that are brought close to and away from.
According to a seventh aspect of the present invention, in the side shim selection device for a differential carrier assembly according to the fifth or sixth aspect, each shaft support portion of the carrier is formed by being divided into two in the radial direction of each shaft support portion. Is provided with offset means that is offset by a predetermined distance in the dividing direction of each shaft support with respect to the axis of each shaft support.
According to an eighth aspect of the present invention, in the differential carrier assembly side shim selection device according to any one of the fifth to seventh aspects , a drive pinion gear is attached to the axial center line and one end of the differential case subassembly supported by the support means. Each of the reference position of the drive pinion gear and the carrier derived from the measurement result of the second measurement means, the second measurement means measuring the distance from the other end face of the drive pinion shaft . The tooth contact between the drive pinion gear and the ring gear is evaluated based on the distance between the shaft support and the axis.

Therefore, in the first aspect of the present invention, the differential case subassembly is centered and supported so as to be rotatable around the axial center line. In this state, the drive pinion gear is driven to rotate, and average values L1, L2, and L3 of the displacement of the differential case subassembly in the axial center line direction with respect to the carrier per rotation of the ring gear are measured. Then, the thicknesses T1 and T2 of the side shims are selected based on the average values L1, L2, and L3.
In the second aspect of the present invention, the pair of centering cones are engaged with the shaft holes of the respective shaft portions of the differential case subassembly, so that the differential case subassembly is centered and supported so as to be rotatable around the axial center line. Is done.
According to the third aspect of the present invention, the pair of centering cones are engaged with the shaft holes of the respective shaft portions of the differential case subassembly so that the differential case subassembly is supported by the respective shaft support portions with respect to the axes of the respective shaft support portions of the carrier. Is offset by a predetermined distance in the dividing direction.
According to the fourth aspect of the present invention, the drive pinion gear mounting reference position (PMD reference) is based on the distance between the axial center line of the differential case subassembly and the other end face of the drive pinion shaft to which the drive pinion gear is mounted at one end. And a PMD (Pinion Mount Distance) between each axis of the carrier and the axis of each carrier. Based on the derived distance PMD, the contact between the drive pinion gear and the ring gear is evaluated.

  According to the fifth aspect of the present invention, the carrier to which the differential case subassembly is assembled is positioned and fixed at the normal position by the carrier fixing means. In addition, the differential case subassembly is centered and supported rotatably by the support means while the carrier is positioned and fixed by the carrier fixing means. Further, a bearing pressure in the thrust direction is applied to the pair of side bearings by the bearing pressurization means, and the drive pinion gear is rotationally driven by the drive means to rotate the ring gear engaged with the drive pinion gear. Then, the displacement of the differential case subassembly in the axial center line direction with respect to the carrier is measured by the first measuring means, and the measurement result of the first measuring means is calculated by the calculating means to calculate the first side shim. The thickness and the thickness of the second side shim are selected.

According to the sixth aspect of the present invention, the pair of centering cones are engaged with the shaft holes of the respective shaft portions of the differential case subassembly, so that the differential case subassembly is centered and supported so as to be rotatable around the axial center line. Is done.
According to the seventh aspect of the present invention, the differential case subassembly is offset by a predetermined distance in the dividing direction of the shaft support portion with respect to the axis of each shaft support portion of the carrier by the offset means.
In the invention according to claim 8, the second measuring means measures the distance between the axial center line of the differential case sub-assembly and the end face of the other end of the drive pinion shaft having the drive pinion gear attached to one end thereof. Based on the measurement result of the second measuring means, a distance PMD (Pinion Mount Distance) between the drive pinion gear mounting reference position (PMD reference) and the axis of each shaft support of the carrier is derived. Based on the derived distance PMD, the contact between the drive pinion gear and the ring gear is evaluated.

A method for selecting a side shim of a differential carrier assembly in which an appropriate side shim is selected is provided.
Further, a side shim selection device for a differential carrier assembly in which an appropriate side shim is selected is provided.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the side shim selection method of the differential carrier assembly 1 is a differential carrier in which a drive pinion gear 3 assembled to a carrier 2 and a ring gear 6 fixed to a flange 5 of a differential case subassembly 4 are engaged with each other. When adjusting the backlash between the drive pinion gear 3 and the ring gear 6 in the assembly 1, the side bearings fitted to the shaft portions 7 and 8 at both ends (left and right sides in FIG. 1) of the differential case subassembly 4. Of the bearing support portions 11 and 12 (shaft support portions) of the carrier 2 on which 9 and 10 are supported, the first side mounted on the first shaft portion 7 on the side opposite to the flange (right side in the drawing in FIG. 1). 1st bearing support part 11 with which bearing 9 is supported The thickness T1 of the first side shim to be assembled and the second bearing support portion 12 on which the second side bearing 10 mounted on the second shaft portion 8 on the flange side (left side in FIG. 1) is supported. The thickness T2 of the second side shim to be assembled to is selected.

  Further, as shown in FIG. 1, in this side shim selection method, the master shims 15 and 16 are assembled to the bearing support portions 11 and 12 of the carrier 2, and the shaft portions 7 and 8 of the differential case subassembly 4 are shafts. Open end portions of the holes are pressed by cone portions 13a and 14a of a pair of support members 13 and 14 (centering cones) disposed on the same axis C1 (see FIG. 6) and rotatable about the axis C1. Is done. As a result, the axial center line of the differential case subassembly 4 is aligned with the axial line C1 of the pair of support members 13 and 14, the differential case subassembly 4 is centered, and the axial center line (of the pair of support members 13 and 14) is aligned. It is supported so as to be rotatable about an axis C1). In this state, the drive pinion gear 3 and the ring gear 6 are rotated by rotating the drive pinion gear 3 while applying a bearing pressure in the thrust direction (left direction as viewed in the drawing in FIG. 1) to the outer race outer surface of the first side bearing 9. After that, the average value L1 (hereinafter referred to as displacement L1) of the displacement of the differential case subassembly 4 in the axial center line direction (left-right direction in FIG. 1) relative to the carrier 2 per rotation of the ring gear 6 is determined. .) Is measured.

  Further, in this side shim selection method, the drive pinion gear 3 is driven to rotate while the bearing pressure in the thrust direction (right direction in the drawing in FIG. 1) is applied to the outer race outer surface of the second side bearing 10. After harmonizing with the ring gear 6, the average value L2 (hereinafter referred to as the displacement L2) of displacement of the differential case subassembly 4 with respect to the carrier 2 per rotation of the ring gear 6 in the axial center line direction (left and right direction in FIG. 1). Is measured). Further, in this side shim selection method, after the master shims 15 and 16 are removed from the bearing support portions 11 and 12, the drive pinion gear 3 and the ring gear 6 are non-backed. In this state, the drive pinion gear 3 An average value L3 (hereinafter referred to as displacement L3) of the displacement of the differential case subassembly 4 in the axial centerline direction (left and right direction in the drawing in FIG. 1) relative to the carrier 2 per rotation of the ring gear 6 by being rotationally driven. Is measured. In this side shim selection method, the side shim thickness T1 assembled to the first bearing support portion 11 and the side shim thickness assembled to the second bearing support portion 12 based on the displacements L1, L2, and L3. T2 is selected.

  As shown in FIG. 1, the differential carrier assembly 1 is rotatably supported by a carrier 2 via a pair of bearings in which a drive pinion shaft 17 is arranged in an axial direction (up and down direction in the drawing in FIG. 1). The drive pinion gear 3 is provided at one end of the drive pinion shaft 17. In the differential carrier assembly 1, the inner races of the side bearings 9 and 10 are fitted on the shafts 7 and 8 of the differential case subassembly 4, and the outer races of the side bearings 9 and 10 are connected to the carrier 2. The bearing support portions 11 and 12 are fitted. The carrier 2 is formed by dividing the bearing support portions 11 and 12 into two in the vertical direction (vertical direction in the drawing in FIG. 1) on the axial plane. When the side shim is selected, the bearing support portions 11 and 12 are formed. Each of the caps in which any of the 12 divided portions (portion on the upper side in FIG. 1 in FIG. 1) is formed on the inner peripheral surface is in a state of being removed from the carrier 2. In this state (a state in which each cap is removed), the differential case subassembly 4 can be attached to and detached from the carrier 2 in the up-down direction (up-down direction in the drawing in FIG. 1).

  As shown in FIG. 5, in the side shim selection direction, the differential case subassembly 4 is centered by the pair of support members 13 and 14, whereby the shaft of the differential case subassembly 4 (support members 13 and 14). The center line is offset from the axis C2 (see FIG. 6) of the bearing support portions 11 and 12 of the carrier 2 by a predetermined distance (1 mm in the present embodiment) upward (upward as viewed in FIG. 1). This is a structure (offset means). Thus, in this side shim selection method, when the displacement in the axial center line direction of the differential case subassembly 4 relative to the carrier 2 is measured, the side bearings 9 and 10 attached to the respective shaft portions of the differential case subassembly 4 are It is easily displaced with respect to the respective bearing support portions 11 and 12 arranged on the carrier 2. The differential case subassembly 4 is rotatably supported by a pair of side gears disposed on the same axis as the shaft portions 7 and 8 and a pinion shaft orthogonal to the shaft portions 7 and 8. A pair of pinion gears meshed with the pair of side gears are accommodated.

  2 to 4 show each displacement L1 of the displacement of the differential case subassembly 4 in the axial center line direction (left and right direction in FIG. 2 and FIG. 3) with respect to the carrier 2 per rotation of the ring gear 6. , L2 and L3 are measured, and the first side shim thickness T1 and the second side shim thickness T2 are selected based on the respective displacements L1, L2 and L3. The side shim selection device 18 is provided with a pressing member 21 (see FIG. 1, carrier fixing means) that is moved up and down by driving the fluid pressure cylinder 20 at the upper part of the main body frame 19. The differential carrier assembly 1 is positioned and fixed at a normal position with respect to the side shim selection device 18 by engaging a plurality of pins protruding from the lower surface of the pressing member 21 at predetermined positions of the carrier 2. Further, the side shim selection device 18 includes a unit base 22 provided so as to be slidable in the left-right direction (left-right direction as viewed in FIG. 2 and FIG. 3) with respect to the main body frame 19.

  As shown in FIG. 4, the main body base 19 is provided with an advancing / retreating base 24 via a linear motion guide 23 that is inclined in the front-rear direction (left-right direction in FIG. 4). The unit base 22 is provided through a linear motion guide 25 extending in the left-right direction (the direction of the paper in FIG. 4). Measurement units 26 are disposed on the left and right sides of the unit base 22, respectively. As shown in FIG. 3, the side shim selector 18 is a measurement unit 26b (hereinafter referred to as a second measurement unit 26b) disposed on the left side (left side in FIG. 3) when viewed from the front. Is provided on the unit base 22 via the linear motion guide 27 and is linearly driven by the fluid pressure cylinder 28 in the left-right direction (left-right direction as viewed in FIG. 2 and FIG. 3). The measurement unit 26a (hereinafter referred to as the first measurement unit 26a) disposed in the vicinity is separated from and approached. As shown in FIG. 5, the first measurement unit 26a is provided with a support member 13 having a cone portion 13a having an outer conical surface formed at the tip thereof so as to be rotatable around an axis C1.

  Further, as shown in FIG. 5, in the first measurement unit 26 a, the encoder 29 detects the angular phase around the axis C <b> 1 of the support member 13. Further, in the first measurement unit 26a, the cone portions 13a, 14a of the pair of support members 13, 14 are engaged with the opening end portions of the shaft holes of the shaft portions 7, 8 of the differential case subassembly 4. Thus, a vibration sensor 32 is provided in which the probe 31 is brought into contact with an oil seal mounting portion 30 provided on the same axis C2 as the bearing support portions 11 and 12 of the carrier 2. In the side shim selection device 18, the differential case subassembly 4 is pivoted while the encoder 29 detects the angular phase of the support member 13 while the probe 31 of the shake sensor 32 is in contact with the oil seal mounting portion 30. By rotating around the center line, the detection data of the encoder 29 and the detection data of the shake sensor 32 are calculated by an arithmetic unit constituted by a microcomputer, and as shown in FIG. Eccentric amount X1 in the X direction (left and right direction as viewed in FIG. 4) of the axial center line of the differential case subassembly 4 with respect to the center O1 of the oil seal mounting portion 30 and Y direction (as viewed in FIG. 4). Eccentric amount Y1 in the vertical direction) is derived.

  Further, as shown in FIG. 5, the first measurement unit 26 a includes a cone portion 13 a, 14 a of the pair of support members 13, 14 that has an opening in the shaft hole of each shaft portion 7, 8 of the differential case subassembly 4. A first pressing head 33 is provided to press the opening end surface of the oil seal mounting portion 30 of the carrier 2 positioned and fixed to the main body frame 19 as necessary, while being engaged with the end portion. In the side shim selection device 18, when the opening end surface of the oil seal mounting portion 30 of the carrier 2 is pressed by the pressing head 33, a propulsive force in the right direction as viewed in FIG. 5 acts on the differential case subassembly 4. Is done. As a result, the unit base 22 is slid in the right direction as viewed in FIG. 5 with respect to the main body frame 19, and the differential case subassembly 4 is moved in the right direction as viewed in FIG. 5 with respect to the carrier 2. A predetermined bearing pressure is applied to the outer race outer surface of the first side bearing 9.

  In the side shim selection device 18, the bearing pressure is arbitrarily set by adjusting the driving force of the fluid pressure cylinder 34 provided in the unit base 22. Further, in the side shim selection device 18, when the master shims 15 and 16 are not assembled to the bearing support portions 11 and 12 of the carrier 2, the pressing head 33 causes the differential case subassembly 4 to be placed in the right direction in FIG. When the unit base 22 is slid in the right direction in FIG. 5 with respect to the main body frame 19, the drive pinion gear 3 and the ring gear 6 are brought into a non-back state. Composed. As shown in FIG. 5, the second measurement unit 26b is provided with a support member 14 having a cone portion 14a having an outer conical surface formed at the tip thereof so as to be rotatable around an axis C1. The support member 14 is detected by the encoder 35 shown in FIG. 2 in the angular phase around the axis C1. In the second measurement unit 26b, the cone portions 13a, 14a of the pair of support members 13, 14 are engaged with the open end portions of the shaft holes of the shaft portions 7, 8 of the differential case subassembly 4. Thus, a shake sensor 38 is provided in which a probe 37 is brought into contact with an oil seal mounting portion 36 provided on the same axis C2 as the bearing support portions 11 and 12 of the carrier 2.

  In the side shim selection device 18, the differential phase of the support member 14 is detected by the encoder 35 shown in FIG. 2 while the probe 37 of the shake sensor 38 is in contact with the oil seal mounting portion 36. When the subassembly 4 is rotated around the axis center line, the detection data of the encoder 35 and the detection data of the shake sensor 38 are calculated by an arithmetic unit constituted by a microcomputer, and is shown in FIG. As shown in FIG. 4, the eccentric amount X2 and the Y direction (FIG. 4) of the axial center line of the differential case subassembly 4 with respect to the center O2 of the oil seal mounting portion 36 of the carrier 2 Eccentric amount Y2 in the vertical direction as viewed in FIG. Further, as shown in FIG. 5, the second measurement unit 26 b includes the cone portions 13 a and 14 a of the pair of support members 13 and 14, and the shaft holes of the shaft portions 7 and 8 of the differential case subassembly 4. A second pressing head 39 is provided to press the opening end surface of the oil seal mounting portion 36 of the carrier 2 positioned and fixed to the main body frame 19 as necessary, while being engaged with the end portion.

  In the side shim selection device 18, the opening end surface of the oil seal mounting portion 36 of the carrier 2 is pressed by the pressing head 39, and the driving force in the leftward direction in FIG. 5 acts on the differential case subassembly 4. . As a result, the unit base 22 is slid in the left direction in FIG. 5 with respect to the main body frame 19, and the differential case subassembly 4 is moved in the left direction in FIG. 5 with respect to the carrier 2. A predetermined bearing pressure is applied to the outer race outer surface of the second side bearing 10. The bearing pressure is arbitrarily set by adjusting the driving force of the fluid pressure cylinder 40 (see FIG. 2) provided in the unit base 22. Further, as shown in FIG. 5, the present side shim selection device 18 is configured to drive the differential carrier assembly 1 that is positioned at a normal position of the side shim selection device 18 by a drive device 43 (drive means) provided in the main body frame 19. The pinion shaft 17 is rotationally driven.

  In the drive device 43, a rotary base 45 is provided at the upper end of the rotary shaft 44, and a pin 46 erected on the rotary base 45 is engaged with a flange 47 fixed to the lower part of the drive pinion shaft 17. Is done. As shown in FIGS. 2 and 5, the side shim selection device 18 has two drive devices 43 arranged in parallel, and each drive device 43 is selectively used in accordance with the differential carrier assembly 1. As shown in FIG. 5, the side shim selection device 18 is provided with a displacement detection sensor 41 at a predetermined position of the main body frame 19. In the side shim selection device 18, the drive pinion shaft 17 is rotationally driven by the drive device 43 and the drive pinion gear 3 is rotated, so that the differential case subassembly 4 is rotated along the axis center line (the axis C 1 of the support members 13 and 14. ) And the position of the detection element 42 provided on the unit base 22 at this time is detected by the displacement detection sensor 41, so that the differential case subassembly 4 is in the axial center line direction with respect to the carrier 2 Each displacement L1, L2, L3 in the left-right direction in FIG. 5 is measured.

The side shim selection device 18 calculates the displacements L1, L2, and L3 and the eccentric amounts X1, Y1, X2, and Y2 based on the side shim selection formula by the arithmetic device, and calculates the thickness of each side shim. T1 and T2 are derived.
The side shim selection formula is
T1 = L3−L1 + M1 + k × (BL0 + A) + correction value 1 (hereinafter referred to as a first selection formula)
T2 = L2-L1 + M1 + M2-T1 + correction value 2 (hereinafter referred to as a second selection formula)
It is represented by Here, M1 is the thickness of the first master shim 15 assembled to the bearing support 11 on the non-flange side (first bearing support 11), and M2 is the bearing support 12 on the flange side (second bearing). The thickness, k, of the second master shim 16 assembled to the support portion 12) is determined by the backlash between the drive pinion gear 3 and the ring gear 6 in the differential carrier assembly 1 and the axial center line of the differential case subassembly 4 (the support members 13, 14). A design coefficient BL0 set according to the amount of movement in the direction of the axis C1), BL0, is a target value for backlash.

A is a correction value for the amount of eccentricity of the center line of the differential case subassembly 4 with respect to the axis C2 of the bearing support portions 11 and 12 of the carrier 2. As shown in FIG. 1, the correction value A is determined in the axial center line direction of the differential case subassembly 4 up to the side shim assembly end faces when the tooth contact aiming position S between the drive pinion gear 3 and the ring gear 5 is used as a reference. The ratio of distance is a: b (where a + b = 1), and the drive pinion gear 3 with respect to the unit displacement amount in the differential carrier subassembly 4 in the vertical direction of the differential case subassembly 4 (viewed in the drawing in FIG. 1) The design coefficient set according to the amount of change in the backlash with the ring gear 6 is m, and the unit displacement in the differential carrier subassembly 1 in the front-rear direction of the differential case subassembly 4 (vertical direction in the drawing in FIG. 1). The drive pinion gear 3 and the ring gear 6 If the coefficients of the design which is set according to the amount of change in rush and n,
A = m (a * X1 + b * X2) + n (a * Y1 + b * Y2).

As shown in FIG. 6, in the side shim selection device 18, the driving device 43 is provided with a pointed member 48 disposed on the same axis with respect to the axial center line of the driving device 43. In the side shim selection device 18, the pointed member 48 is brought into contact with the end surface of the other end of the drive pinion shaft 17 in which the drive pinion gear 3 is attached to one end of the differential carrier assembly 1 that is positioned and fixed at a normal position. Thus, the distance P between the end surface of the other end of the drive pinion shaft 17 and the axial center line of the differential case subassembly 4 (the axis C1 of the support members 13 and 14) is measured (second measuring means). Yes. Further, the side shim selection device 18 sends an offset value Q (the axial center line of the differential case subassembly 4 (the axis of the support members 13 and 14) with respect to the axis C2 of the bearing support portions 11 and 12 of the carrier 2 to the arithmetic device. Measurement value) and the distance R (measurement result in the previous process ) between the mounting reference position of the drive pinion gear 3 (PMD reference) and the other end face of the drive pinion shaft 17 are set, and P, Q, and R are calculated. By performing arithmetic processing by the apparatus, a distance PMD (Pinion Mount Distance) between the reference mounting position of the drive pinion gear 3 and the axis C2 of the bearing support portions 11 and 12 of the carrier 2 is derived.

  Hereinafter, the operation of the present embodiment will be described. First, the differential carrier assembly 1 in which the master shims 15 and 16 are assembled to the bearing support portions 11 and 12 (shaft support portions) of the carrier 2 is attached to a pallet (differential carrier assembly transport jig). Then, the pallet to which the differential carrier assembly 1 is attached is transported by the transport device and positioned at a predetermined position of the side shim selection device 18. When the pallet is positioned, the pressing member 21 of the side shim selection device 18 is lowered, and the carrier 2 of the differential carrier assembly 1 is positioned and fixed at a normal position in the side shim selection device 18. Next, as shown in FIG. 5, the pair of support members 13 and 14 (centering cones) of the side shim selection device 18 are engaged with the shaft holes of the shaft portions 7 and 8 at both ends of the differential case subassembly 4. The open end portions of the shaft holes of the shaft portions 7 and 8 are pressed by the cone portions 13a and 14a of the support members 13 and 14, respectively.

As a result, the axial center line of the differential case subassembly 4 is arranged on the same axis with respect to the axial line C1 of the pair of support members 13 and 14, and the differential case subassembly 4 is centered. When the differential case subassembly 4 is centered, the axial center line of the differential case subassembly 4 is above the axis C2 (see FIG. 6) of the bearing support portions 11 and 12 of the carrier 2 (see FIG. 1). Is offset by a predetermined distance (up to 1 mm in the present embodiment). Next, as shown in FIG. 6, the turntable 45 of the drive device 43 of the side shim selection device 18 is raised, and the pin 46 of the turntable 45 is fixed to the drive pinion shaft 17 of the differential carrier assembly 1. 47, and the pointed member 48 is brought into contact with the other end face of the drive pinion shaft 17 to which the drive pinion gear 3 is attached at one end . In this state, the distance P between the end face of the other end of the drive pinion shaft 17 and the axial center line of the differential case subassembly 4 (axis C1 of the support members 13 and 14) is measured, and the measurement result is set in the arithmetic unit. The

Further, the distance P, the offset value Q of the axis center line of the differential case subassembly 4 (the axis of the support members 13 and 14) with respect to the axis C2 of the bearing support portions 11 and 12 of the carrier 2, and the mounting reference of the drive pinion gear 3 The distance R between the position (PMD reference) and the other end face of the drive pinion shaft 17 is processed by the calculation device, and the reference mounting position of the drive pinion gear 3 and the axis C2 of the bearing support portions 11 and 12 of the carrier 2 A distance PMD (Pinion Mount Distance) is derived. The derived PMD is subjected to upper and lower limit management, so that the tooth contact between the drive pinion gear 3 and the ring gear 6 is confirmed. On the other hand, with the differential case subassembly 4 supported by the pair of support members 13, 14, the opening end surface of the oil seal mounting portion 30 of the carrier 2 is pressed by the pressing head 33, and the outer side of the first side bearing 9 is outside the outer race. A bearing pressure of 0.5 kN is applied to the side surface. In this state, the drive pinion gear 3 (drive pinion shaft 17) is rotationally driven by the drive device 43 for a predetermined time, and the various parts of the differential carrier assembly 1 are harmonized.

  Then, after the differential carrier assembly 1 is harmonized, the displacement L1 of the differential case subassembly 4 is measured in a state where the bearing pressure is held on the outer race outer surface of the first side bearing 9. Next, after the bearing pressure on the outer race outer surface of the first side bearing 9 is released, the opening end surface of the oil seal mounting portion 36 of the carrier 2 is pressed by the pressing head 39, so that the second side bearing 10 A bearing pressure of 0.5 kN is applied to the outer surface of the outer race. In this state, the drive pinion gear 3 (drive pinion shaft 17) is rotationally driven by the drive device 43 for a predetermined time, and the various parts of the differential carrier assembly 1 are harmonized. Then, after the differential carrier assembly 1 is harmonized, the displacement L2 of the differential case subassembly 4 is measured in a state where the bearing pressure is held on the outer race outer surface of the second side bearing 10.

  Further, after the displacements L1 and L2 are measured, the master shims 15 and 16 of the bearing support portions 11 and 12 of the carrier 2 are removed. Next, when the opening end surface of the oil seal mounting portion 30 of the carrier 2 is pressed by the pressing head 33 with a driving force of 0.5 kN, the differential case subassembly 4 is against the carrier 2 in the axial center line direction opposite flange side ( 1), the drive pinion gear 3 and the ring gear 6 are brought into a non-back state. In this state, the drive pinion gear 3 (drive pinion shaft 17) is rotationally driven by the drive device 43 for a predetermined time, and the various parts of the differential carrier assembly 1 are harmonized. After the differential carrier assembly 1 is harmonized, the displacement L3 of the differential case subassembly 4 is measured with the drive pinion gear 3 and the ring gear 4 being non-back. Next, in a state where the differential case subassembly 4 is supported by the pair of support members 13 and 14 and the bearing pressure of each side bearing is released, the center O1 of each oil seal mounting portion 30 and 36 of the carrier 2 is set. O2 is measured.

  Based on the center O1, O2 of each oil seal mounting portion 30, 36 and the position of the axial center line of the differential case subassembly 4 obtained from the axial position of the pair of support members 13, 14, the arithmetic unit performs the center operation. An eccentricity amount X1 of the axial center line of the differential case subassembly 4 with respect to O1 in the X direction and an eccentricity amount Y1 of the axial direction of the differential case subassembly 4 with respect to the center O2 are derived. An amount X2 and an eccentric amount Y2 in the Y direction are derived. Further, the first side shim thickness T1 is derived by the first selection formula, and the second side shim thickness T2 is derived by the second selection formula.

This embodiment has the following effects.
In the present side shim selection method and side shim selection device 18, the opening end portions of the shaft holes of the shaft portions 7 and 8 at both ends of the differential case subassembly 4 are the cone portions 13 a and 14 a of the pair of support members 13 and 14 (centering cone). Is pressed by.
Therefore, in the side shim selection method and the side shim selection device 18, the axial center line of the differential case subassembly 4 is aligned with the axial line C1 of the pair of support members 13 and 14, and the differential case subassembly 4 is centered. Thus, unlike the conventional side shim selection device, the position of the axial center line of the differential case subassembly 4 does not vary with respect to the carrier 2 and the pair of support members 13 and 14, and the axial center line of the differential case subassembly 4 Therefore, the measurement accuracy of the repetition of each of the displacements L1, L2, and L3 is increased, and a side shim having an appropriate thickness T1 and T2 is selected.

  Further, in the side shim selection method and the side shim selection device 18, since the position of the axial center line of the differential case subassembly 4 is accurately detected, the axial line C2 of the bearing support portions 11 and 12 of the carrier 2 (in this embodiment, The axial center line C1 of the differential case subassembly 4 with respect to the center O1 and O2 of the oil seal mounting portions 30 and 36 is measured and the position of C2 is detected (in this embodiment, the axial position C1 of the support members 13 and 14). ) Is derived with high accuracy, so that more appropriate thicknesses T1, T2 are obtained based on these eccentric amounts X1, Y1, X2, Y2. Side shims are selected.

Further, in the present side shim selection method and side shim selection device 18, since the position of the axial center line of the differential case subassembly 4 is accurately detected, the pointed member 48 is connected to the drive pinion shaft 17 to which the drive pinion gear 3 is attached at one end. held in contact with an end surface of the end by a distance P between the other end of the end face and the axial center line of the differential case subassembly 4 of the drive pinion shaft 17 (axis C1 of the support members 13, 14) is measured with high accuracy. Thereby, based on the distance P, a distance PMD (Pinion Mount Distance) between the mounting reference position (PMD reference) of the drive pinion gear 3 and the axis C2 of the bearing support portions 11 and 12 of the carrier 2 is derived. Therefore, it is possible to check the contact between the drive pinion gear 3 and the ring gear 6 by managing the upper and lower limits of the derived PMD. This eliminates the conventional tooth contact confirmation process by skilled workers, clarifying the tooth contact standard, improving quality (reliability), and enabling quantitative inspection to be completed. Can be improved.

  The side shim selection method and the side shim selection device 18 can be employed in a transfer assembly or the like that needs to properly manage the backlash of the hypoid gear, like the differential carrier assembly 1.

It is explanatory drawing of the side shim selection apparatus of this differential carrier assembly, and is a figure which shows the outline of the support structure of a differential case subassembly especially. It is a front view of the side shim selection apparatus of this differential carrier assembly. It is a top view of the side shim selection apparatus of this differential carrier assembly. It is a side view of the side shim selection apparatus of this differential carrier assembly. It is explanatory drawing of the side shim selection apparatus of this differential carrier assembly, and is a figure which shows the outline of the structure of a measurement unit especially. It is explanatory drawing of the side shim selection apparatus of this differential carrier assembly, and is a figure which shows the structure where PMD is measured especially. It is explanatory drawing of the side shim selection apparatus of this differential carrier assembly, and is a figure which shows the eccentric amount of the axial centerline of a differential case subassembly with respect to the center O1 of the oil seal mounting part by the side of a carrier opposite flange. It is explanatory drawing of the side shim selection apparatus of this differential carrier assembly, and is a figure which shows the amount of eccentricity of the axial centerline of a differential case subassembly with respect to the center O2 of the oil seal mounting part by the side of a carrier flange especially.

Explanation of symbols

1 differential carrier assembly, 2 carrier, 3 drive pinion gear, 4 differential case subassembly, 5 flange, 6 ring gear, 7, 8 shaft part, 9, 10 side bearing, 11, 12 bearing support part (shaft support part), 13, 14 support Member (Centering cone), 15, 16 Master shim, 17 Drive pinion shaft, 18 Side shim selection device

Claims (8)

When adjusting the backlash between the drive pinion gear and the ring gear that are engaged with each other of the differential carrier assembly, the differential case subassembly of the differential case subassembly is disposed on the carrier and supports the shafts at both ends of the differential case subassembly. The thickness of the first side shim assembled to the first shaft supporting portion that supports the first shaft portion on the side opposite to the flange, and the second shaft supporting portion that supports the second shaft portion on the flange side of the differential case subassembly. A side shim selection method for a differential carrier assembly in which a thickness of a second side shim to be assembled is selected, wherein a first master shim is assembled to the first shaft support portion and a second shim is attached to the second shaft support portion. The step of assembling the master shim and the differential case sub A step in which the assembly is centered and supported so as to be rotatable around an axial center line; and a bearing pressure in a thrust direction is applied to an outer race outer surface of the first side bearing mounted on the first shaft portion. On the other hand, after the drive pinion gear is driven to rotate, an average value L1 of the displacement of the differential case subassembly in the axial center line direction with respect to the carrier per one rotation of the ring gear is measured; The drive pinion gear is driven to rotate while acting on the outer race outer surface of the second side bearing mounted on the shaft portion while thrust is applied, and then the differential case subassembly is rotated per rotation of the ring gear. Measuring an average value L2 of displacement in the axial center line direction with respect to the carrier; The step of removing the first master shim from the first shaft support and the second master shim from the second shaft support, and the outer race of the first side bearing after each master shim is removed on the outer surface by the action of the thrust direction of the bearing preload, said the drive pinion gear and said ring gear in the non-back, in this state, by rotating the said drive pinion gear, the differential case subassembly of the ring gear 1 A step of measuring an average value L3 of displacement in the axial center line direction with respect to the carrier per rotation, and each side shim based on the measured average values L1, L2, and L3. The side of the differential carrier assembly, characterized in that the thickness is selected Shim selection method. A pair of centering cones that can move close to and away from each other are engaged with the respective shaft holes formed in the respective shaft portions of the differential case subassembly, whereby the differential case subassembly is centered and rotated around the shaft center line. The method for selecting a side shim of a differential carrier assembly according to claim 1, wherein the side shim is supported. Each of the shaft support portions of the carrier is formed by being divided into two in the radial direction of each shaft support portion, and the pair of centering cones are engaged with each shaft hole formed in each shaft portion of the differential case subassembly. 3. The differential carrier assembly side shim selection method according to claim 1, wherein the differential case subassembly is offset by a predetermined distance with respect to the axis of each shaft support portion in the dividing direction of each shaft support portion. With the differential case subassembly centered, the distance between the axial center line of the differential case subassembly and the end surface of the other end of the drive pinion shaft with the drive pinion gear attached to one end is measured. A distance between the reference position of the drive pinion gear and the axis of each shaft support of the carrier is derived, and the distance between the reference position of the drive pinion gear and the axis of each support of the carrier The side shim selection method according to any one of claims 1 to 3, wherein a tooth contact between the drive pinion gear and the ring gear is evaluated based on the relationship. A differential carrier assembly side shim selection device used in the differential carrier assembly side shim selection method according to claim 1, wherein each of the shaft support portions of the carrier supporting the shaft portions at both ends of the differential case subassembly is provided as necessary. The master shim to be assembled, the carrier fixing means for positioning and fixing the carrier to which the differential case subassembly is assembled at a normal position, and the differential case subassembly being centered in a state where the carrier is positioned and fixed by the carrier fixing means. The bearing means in the thrust direction is applied to a pair of side bearings mounted on the shafts at both ends of the differential case subassembly supported by the support means rotatably supported around the shaft center line. A bearing pressurizing unit to be used, a driving unit in which a ring gear engaged with the drive pinion gear is rotated and rotated, and a displacement of the differential case subassembly in the axial center line direction with respect to the carrier is measured. The first measurement means, the measurement result of the first measurement means are processed, and the thickness of the first side shim assembled to the first shaft support portion on the side opposite to the flange of the carrier and the second side on the flange side A calculation unit that outputs the thickness of the second side shim assembled to the shaft support, and the thickness of the first side shim and the thickness of the second side shim are selected by a side shim selection device. A differential shim selection device for a differential carrier assembly. The said support means is equipped with a pair of centering cones engaged with each shaft hole formed in the said shaft part of the both ends of the said differential case subassembly, and mutually approaching / separating. Side shim selection device for differential carrier assembly. Offset means in which each shaft support portion of the carrier is divided into two in the radial direction of each shaft support portion, and the differential case subassembly is offset by a predetermined distance in the direction of division of each shaft support portion with respect to the axis of each shaft support portion A side shim selection device for a differential carrier assembly according to claim 5 or 6. A second measuring means for measuring a distance between an axial center line of the differential case subassembly supported by the supporting means and an end face of the other end of the drive pinion shaft to which the drive pinion gear is attached at one end; Based on the distance between the mounting reference position of the drive pinion gear derived based on the measurement result of the second measuring means and the axis of each shaft support portion of the carrier, the tooth contact between the drive pinion gear and the ring gear is The side shim selection device for a differential carrier assembly according to any one of claims 5 to 7, wherein the side shim selection device is evaluated.

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