JP2018132075A - Differential device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembly workability by enabling a bracket which is interposed between a back face of a differential gear and an inner peripheral surface of an input member and into which a differential gear support shaft is inserted in a slidable manner, to be assembled with the input member while performing whirl stop even without using a fastening component in a differential device.SOLUTION: A differential device D comprises multiple support members B which are interposed between back faces of multiple differential gears 21 and an inner peripheral surface of an input member 13 and into which a differential gear support shaft 20 is inserted in a slidable manner. A radially inward flange 13f of the input member 13 includes a support shaft engage part 13fa to which the differential gear support shaft 20 is engaged. The support shaft engage part 13fa includes openings O and O' into which the differential gear support shaft 20 can be engaged from the axial outside. The support member B includes at least one flange abutment surface 24cs which is abutted to the flange 13f to regulate rotation of the support member B around the differential gear support shaft 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a differential device, in particular, a plurality of differential gears (pinion gears), at least one differential gear support shaft (pinion shaft) that supports the plurality of differential gears, and a plurality of differential gears and differential gears. An input member (ring gear) that houses the support shaft and transmits the rotational force input from the power source to the differential gear support shaft and can rotate together with the differential gear support shaft, and a shaft for a plurality of differential gears The present invention relates to a differential device including a pair of output gears (side gears) meshing from both sides in the direction.

  In the present invention and this specification, “axial direction” refers to the axial direction of the output gear (side gear), and “radial direction” refers to the radial direction of the output gear (side gear). Further, the “back surface” of the differential gear (pinion gear) refers to an end surface on the outer side in the direction along the rotation axis of the differential gear (pinion gear).

  For example, FIG. 4 of Patent Document 1 discloses a differential device in which a support member for inserting and supporting a pinion shaft is interposed between the back surface of each pinion gear and the inner peripheral portion of the ring gear. .

Japanese Utility Model Publication No. 53-8861

  The structure of the differential device of Patent Document 1 can be easily accommodated by simply changing the size of the support member when implemented in a model in which the radial relative positions of the back surface of the pinion gear and the inner peripheral portion of the ring gear are different. There is.

  However, in the differential device of Patent Document 1, since the support member is coupled to the ring gear by fastening bolts, the number of assembling steps increases, which is disadvantageous in improving the assembly workability.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a differential device capable of efficiently assembling a support member without using fastening parts such as bolts.

  To achieve the above object, the present invention provides a plurality of differential gears, at least one differential gear support shaft that supports the plurality of differential gears, the plurality of differential gears, and the differential gear support. A shaft is accommodated inside, a rotational force input from a power source is transmitted to the differential gear support shaft, and a ring-shaped input member that can rotate with the differential gear support shaft, and the plurality of differential gears. A differential device comprising a pair of output gears meshed from both sides in the axial direction, wherein the differential gear support is interposed between a back surface of the plurality of differential gears and an inner peripheral surface of the input member. A plurality of support members through which a shaft is slidably inserted; and the input member has a radially inward flange portion at an inner peripheral portion, and the flange portion receives a rotational force of the input member as the differential Engage the differential gear support shaft so that it can be transmitted to the gear support shaft. The support shaft engaging portion has an opening that allows the differential gear support shaft to be engaged from the outside in the axial direction, and the support member includes the flange portion. And at least one flange contact surface for restricting rotation of the support member around the differential gear support shaft.

  According to the present invention, in addition to the first feature, the at least one flange contact surface includes at least a pair of flange contact surfaces opposed to each other with the flange portion sandwiched in the axial direction. And

  In addition to the first or second feature, the present invention further comprises a movement restricting means for restricting the movement of the differential gear toward the radially inward side with respect to the differential gear support shaft. And

  In addition to the third feature, the present invention has a fourth feature in that the movement restricting means is configured by the output gear and the differential gear, each of which is a bevel gear.

  According to the first aspect of the present invention, the support member interposed between the back surface of the differential gear and the inner peripheral surface of the input member is prevented from rotating with respect to the input member without using a fastening part. However, assembly becomes possible, and the assembly workability is improved.

  According to the second feature, the flange portion of the input member is sandwiched between the pair of flange contact surfaces of the support member in the axial direction, so that not only the rotation of the support member but also the movement of the support member in the axial direction is restricted. Since this can be achieved, the support member can be more easily assembled to the input member without using fastening parts, and the assembly workability is further improved.

  According to the third feature, the movement restricting means can restrict the movement of the differential gear inward in the radial direction with respect to the differential gear support shaft, whereby the sliding of the support member with respect to the differential gear support shaft can be performed. Therefore, the support member can be held at a fixed position on the differential gear support shaft.

  According to the fourth feature, the output gear and the differential gear, each of which is a bevel gear, are used to engage the differential gear with respect to the differential gear support shaft toward the radially inner side of the differential gear (and hence the support member). Can restrict movement. This eliminates the need for dedicated parts for restricting movement, which can contribute to a reduction in the number of parts and, in turn, cost savings.

Sectional drawing of the principal part of the differential gear which concerns on 1st Embodiment of this invention (1-1 sectional view taken on the line of FIG. 2). 2-2 sectional view of FIG. Enlarged view of section 3 in FIG. Sectional view taken along line 4-4 in FIG. (A) is a principal part perspective view which shows the connection part of a ring gear, a bracket, and a pinion support shaft, (B) is an exploded perspective view of the said connection part. Simplified explanatory view showing an example of an assembly process of a subassembly including a ring gear, a bracket, a pinion gear, and a pinion support shaft Sectional drawing of the principal part of the differential gear which concerns on 2nd Embodiment of this invention (corresponding figure of FIG. 3).

  First, a first embodiment of the present invention will be described below with reference to the accompanying drawings.

  1 and 2, a differential device D is accommodated in a transmission case 10 of an automobile together with a transmission (not shown). The differential device D includes a differential case DC and a differential gear mechanism DG built in the differential case DC.

  First, the differential case DC will be described. The differential case DC includes, for example, a pair of left and right cover parts 11 and 12 having a flat dish shape, and a ring gear 13 that is sandwiched and fixed between the opposed open end parts 11a and 12a of the cover parts 11 and 12. .

  The ring gear 13 includes an annular ring gear main body 13m, and a radially inward annular flange portion 13f that projects integrally with an inner peripheral portion of the ring gear main body 13m. A driven gear portion 13mg is formed on the outer peripheral portion of the ring gear main body 13m, and the driven gear portion 13mg is engaged with an output portion of a transmission connected to a power source (for example, an engine), for example, a drive gear 14, thereby Receives rotational driving force. The flange portion 13f is provided with a plurality of bolt holes 13fh at intervals in the circumferential direction.

  The first and second bosses 11b and 12b facing outward in the axial direction are integrally projected from the center of the outer surface of the left and right cover portions 11 and 12, respectively. The differential case DC is rotatably supported around the first axis X1 by the transmission case 10 via the bearings 15 and 16 at the first and second bosses 11b and 12b.

  Referring also to FIGS. 3 to 5, the left and right cover portions 11, 12 have the axial end surfaces of the open end portions 11 a, 12 a facing each other in the axial direction with the flange portion 13 f of the ring gear 13 interposed therebetween. Further, the outer peripheral surfaces of the open end portions 11a and 12a are fitted to the inner peripheral surface of the ring gear 13 on the left and right sides of the flange portion 13f. The left and right cover portions 11 and the ring gear 13 are coupled by a first bolt b1 that passes through the cover portion 11 from the outside in the axial direction and is screwed into the bolt hole 13fh of the flange portion 13f. Further, the other left and right cover portions 12 and the ring gear 13 are coupled by a second bolt b2 that penetrates the cover portion 12 from the outside in the axial direction and is screwed into the bolt hole 13fh of the flange portion 13f. The first and second bolts b1 and b2 are screwed alternately into the plurality of bolt holes 13fh of the flange portion 13f one by one in the circumferential direction (that is, alternately).

  The open end portions 11a and 12a of the cover portions 11 and 12 are integrally formed with a plurality of boss portions 11as and 12as that reinforce the peripheral portions of the first and second bolts b1 and b2 of the open end portions 11a and 12a. Is done. Further, in the open end portions 11a and 12a, notched concave portions 11ac and 12ac for avoiding interference with a bracket B described later are formed corresponding to the bracket B, respectively.

  Next, the differential gear mechanism DG will be described. The differential gear mechanism DG is, for example, a pinion that is held on the differential case DC (more specifically, the ring gear 13) so as to pass through the center C of the differential case DC on the second axis X2 orthogonal to the first axis X1. A support shaft 20, a pair of pinion gears 21 that are rotatably fitted to and supported by the pinion support shaft 20 and slidable along the second axis X2, and are arranged so as to sandwich each pinion gear 21 from both left and right sides. A pair of side gears 22 and 23 that mesh with each pinion gear 21, and a bracket B that is interposed between the back surface 21f of each pinion gear 21 and the inner peripheral surface of the ring gear 13 and through which the pinion support shaft 20 is slidably inserted. With.

  Each of the pinion gear 21 and the side gears 22 and 23 is constituted by a bevel gear, and is incorporated in the differential case DC together with the pinion support shaft 20 and the bracket B. Thus, the pinion support shaft 20 is an example of a differential gear support shaft, the pinion gear 21 is an example of a differential gear, the side gears 22 and 23 are examples of an output gear, and the ring gear 13 is an example of an input member. Furthermore, the bracket B is an example of a support member.

  Both end portions 20a of the pinion support shaft 20 are respectively engaged with a pair of engagement recesses 13fa provided on the inner peripheral surface of the flange portion 13f of the ring gear 13 at a circumferential interval (on one diameter line in this embodiment). To do. Each engaging recess 13fa is formed in a groove shape that crosses the flange portion 13f in the axial direction. Accordingly, each engaging recess 13fa has openings O and O '(see FIG. 6A) at both ends in the axial direction, in which both ends 20a of the pinion support shaft 20 can be fitted and detached from the outside in the axial direction. . Thus, the engaging recess 13fa is an example of a support shaft engaging portion.

  In addition, a pair of flat cut-out surfaces 20af parallel to each other are formed on both sides of the outer peripheral surface of both end portions 20a of the pinion support shaft 20 with the axis (that is, the second axis X2) of the pinion support shaft 20 in between. In the engaged state between the both end portions 20a of the pinion support shaft 20 and the engaging recess 13fa of the flange portion 13f, the pair of cutout surfaces 20af face the pair of flat inner surfaces facing each other of the engaging recess 13fa. Contact. This surface contact reduces the contact surface pressure between the ring gear 13 and the pinion support shaft 20 during torque transmission, which is effective for suppressing wear on the contact surface.

  The bracket B is, for example, a bracket main body 24 formed in a substantially cylindrical shape, and formed in a larger diameter than the bracket main body 24 and integrally connected to an inner end portion of the bracket main body 24 (that is, an end portion on the pinion gear 21 side). Gear receiving portion 25. The pinion support shaft 20 is slidably inserted into the bracket center hole Bh that penetrates the bracket body 24 and the gear receiving portion 25. In the present embodiment, the outer peripheral surface of the bracket body 24 is formed as a tapered surface that gradually decreases in diameter as it approaches the ring gear 13, but each part may be formed as a cylindrical surface having a uniform isometric diameter.

  A back surface 21f of the pinion gear 21 is rotatably contacted and supported by the end surface 25f of the gear receiving portion 25 via a washer 26. The end face 25f of the gear receiving portion 25, the back face 21f of the pinion gear 21, and the washer 26 are all formed in a spherical shape having a center on the second axis X2.

  The washer 26 is formed with a smaller diameter than the end face 25 f of the gear receiving portion 25 and a larger diameter than the rear face 21 f of the pinion gear 21. Thereby, the contact surface pressure between the end surface 25f of the gear receiving portion 25 and the outer peripheral edge portion of the washer 26 can be reduced, which is effective in preventing uneven wear of the end surface 25f. If necessary, the washer 26 may be omitted, and the back surface 21f of the pinion gear 21 may be in direct contact with the end surface 25f of the gear receiving portion 25.

  Further, the outer end portion of the bracket body 24 (that is, the end portion on the ring gear 13 side) has a pair of notch-shaped recesses 24c that fit into the flange portion 13f of the ring gear 13. The bottom surface 24cb of each notch-shaped recess 24c abuts on the inner peripheral end of the flange portion 13f, and the pair of opposed inner side surfaces 24cs of each notch-shaped recess 24c abuts on both side surfaces of the flange portion 13f. . Thus, the outer sliding limit of the bracket B on the pinion support shaft 20 is defined by the bottom surface 24cb of each notch-shaped recess 24c coming into contact with the inner peripheral end of the flange portion 13f.

  In the present embodiment, at least one inner side surface 24cs of each notch-shaped recess 24c is an example of a flange contact surface that contacts the side surface of the flange portion 13f and restricts rotation of the bracket B around the pinion support shaft 20. . In the present embodiment, the pair of opposed inner side surfaces 24cs of each notch-shaped recess 24c is also an example of a pair of flange contact surfaces facing each other with the flange portion 13f sandwiched in the axial direction.

  Thus, the pair of inner side surfaces 24cs of each notch-shaped recess 24c clamps the flange portion 13f in the axial direction when the bracket B is at the outer sliding limit described above. Thereby, since the movement of the bracket B in the axial direction is restricted, the separation of the end 20a of the pinion support shaft 20 inserted through the bracket B from the notch-shaped recess 24c is prevented.

  The pair of side gears 22 and 23 are shaft portions 22j and 23j that are rotatably fitted to and supported by the first and second bosses 11b and 12b of the left and right cover portions 11 and 12, and the shafts of the shaft portions 22j and 23j. Gear body portions 22m and 23m that are relatively flat in the axial direction and project outward in the radial direction from the inner end portion in the direction. The back surfaces of the gear main body portions 22m and 23m are in contact with and supported by the inner surfaces of the left and right cover portions 11 and 12 via a washer 27 (or directly). Further, tooth portions 22 mg and 23 mg that mesh with the pinion gear 21 are formed on the outer peripheral portions of the gear main body portions 22 m and 23 m.

  The inner end portions of the first and second drive shafts 31 and 32 arranged on the first axis X1 are spline-fitted to the inner peripheral surfaces of the shaft portions 22j and 23j of the side gears 22 and 23, respectively. The outer end sides of the first and second drive shafts 31 and 32 are interlocked and connected to left and right axles (not shown). In addition, between the outer periphery of the intermediate part of the 1st, 2nd drive shafts 31 and 32 and each of the through-holes 10h and 10h 'of the transmission case 10 which both the drive shafts 31 and 32 penetrate, it is the sealing members 33 and 34, respectively. Sealed.

  The rotational driving force from the power source that is input to the differential case DC is transmitted to the pair of side gears 22 and 23 and further to the first and second driving shafts 31 and 32 via the pinion support shaft 20 and the pinion gear 21. As a result, the drive shafts 31 and 32 (and thus the left and right axles) are rotationally driven while allowing differential rotation.

  By the way, in the state where the differential gear mechanism DG is assembled in the differential case DC, the pinion gear 21 and the side gears 22 and 23 are each constituted by bevel gears, and the bevel gears mesh with each other to engage the pinion support shaft 20 with respect to the pinion support shaft 20. Movement inward in the radial direction is restricted. Thereby, sliding of the bracket B supporting the back surface 21f of the pinion gear 21 from the outer sliding limit to the radially inner side is also restricted, that is, the bracket B is held at the outer sliding limit. . Thus, the pinion gear 21 and the side gears 22 and 23, which are bevel gears, cooperate with each other to control movement of the pinion gear 21 (and hence the bracket B) in the radially inward direction with respect to the pinion support shaft 20. Configure.

  As the movement restricting means S, the dedicated movement restricting means S may be used instead of the pinion gear 21 and the side gears 22 and 23 as in the present embodiment. For example, even when the pinion gear 21 and the side gears 22 and 23 are gears other than bevel gears, a retaining ring such as a circlip or the like that is locked to the pinion support shaft 20 and engages with the pinion gear 21 so as to be relatively rotatable can be provided. The movement restricting means S may be used. Or it is good also as the movement control means S to the protruding wall formed in the tooth groove valley part in the radial direction inner end part of the tooth parts 22mg and 23mg of the side gears 22 and 23.

  Next, the operation of the embodiment will be described with reference to FIG.

  In assembling the differential device D, first, as shown in FIG. 6A, the pair of pinion gears 21, washers 26 and brackets B are fitted to the pinion support shaft 20, and the pinion gears 21, washers 26 and brackets are fitted. B is brought into a state where it is brought close to the intermediate portion of the pinion support shaft 20. Next, from this state, as shown in FIG. 6 (B), the two end portions 20a of the pinion support shaft 20 are opened from one axially outward side to the pair of engaging recesses 13fa of the flange portion 13f of the ring gear 13. Enter and engage through O or O '.

  Thereafter, as shown by the solid line in FIG. 6C, the pinion gear 21, the washer 26 and the bracket B are slid to the outer sliding limit on the pinion support shaft 20, thereby the pinion support shaft 20, the pinion gear. 21, a sub-assembly SA in which the washer 26 and the bracket B are temporarily assembled to the ring gear 13 is obtained. This temporarily assembled state can be held by a jig (not shown) or an operator's hand. The outward sliding limit is such that the notch-shaped recess 24c of the bracket body 24 is fitted to the flange portion 13f (more specifically, the bottom surface 24cb of the notch-shaped recess 24c is contacted with the inner peripheral end of the flange portion 13f. It is regulated by letting contact.

  Next, as shown by a two-dot chain line in FIG. 6C (for example, below the pinion support shaft 20), the left and right side gears 22 and the pinion gear 21 are engaged with each other with respect to the subassembly SA, and before this engagement or Later, the back surfaces of the left and right side gears 22 are covered and supported by the left and right cover portions 11 with the washers 27 interposed therebetween. Then, along with the series of operations, the outer peripheral surface of the open end portion 11a of one of the left and right cover portions 11 is fitted to the inner peripheral surface of the ring gear 13, and the axial end surface of the open end portion 11a is connected to the flange of the ring gear 13. The right and left cover parts 11 and the ring gear 13 (more specifically, the flange part 13f) are coupled to each other by the first bolt b1.

  Further, as shown by a two-dot chain line in FIG. 6C (for example, above the pinion support shaft 20), the left and right side gears 23 and the pinion gear 21 are meshed with the subassembly SA, and before or after this meshing, The right and left side cover 23 is covered and supported by a washer 27 on the back of the left and right side gear 23. Then, similarly to the left and right one cover portion 11, the left and right other cover portion 12 and the ring gear 13 are coupled by the second bolt b2.

  Thus, the assembly work of the differential device D is completed. In the present embodiment, the cover portions 11 and 12 and the ring gear 13 are bolted, but they may be coupled by other coupling means (for example, welding, caulking, adhesion, etc.).

  The differential device D thus assembled is supported on the mission case 10 via the bearings 15 and 16, and then the first and second drive shafts 31 and 32 are passed through the through holes 10 h and 10 h ′ of the mission case 10. The inner end portions of the drive shafts 31 and 32 are spline fitted to the inner periphery of the shaft portions 22j and 23j of the left and right side gears 22 and 23. The space between the inner surfaces of the through holes 10h and 10h 'and the first and second drive shafts 31 and 32 is sealed with annular seal members 33 and 34.

  The differential device D of the present embodiment described above includes the bracket B that is interposed between the back surface 21f of the pinion gear 21 and the inner peripheral surface of the ring gear 13 and functions as a spacer that keeps the distance therebetween constant. The pinion support shaft 20 is slidably inserted into the bracket B, and the radially inward flange portion 13f of the inner peripheral portion of the ring gear 13 can transmit torque to the end portion 20a of the pinion support shaft 20. The engaging recess 13fa is engaged, and the engaging recess 13fa has openings O and O 'that allow the pinion support shaft 20 to be engaged and disengaged from the outside in the axial direction with respect to the engaging recess 13fa. Yes. In addition, the notch-like recess 24c at the outer end of the bracket B is fitted to the flange 13f of the ring gear 13, and the flange contact surface of the bracket B (specifically, the notch-like recess) in the fitted state. The inner surface 24cs) of 24c abuts against the flange portion 13f so as not to be relatively rotatable.

  Thereby, even if fastening parts, such as a volt | bolt, are not used specially, it becomes possible to assemble | attach easily, preventing rotation of the bracket B with respect to the ring gear 13, and an assembly workability | operativity improves. Further, since the bracket B is prevented from rotating with respect to the ring gear 13, the contact portions of the bracket B and the ring gear 13 do not rotate and slide with each other. There is no need for consideration, and costs are reduced accordingly.

  In particular, the bracket B of the present embodiment has a pair of flange contact surfaces (that is, a pair of opposed inner side surfaces 24cs of the notch-shaped recess 24c) that sandwich the flange portion 13f in the axial direction. Therefore, for example, if the bracket B is in the outward sliding limit as shown in FIG. 6C in the state of the subassembly SA during assembly, both inner side surfaces 24cs of the notch-shaped recess 24c are flange portions. By clamping 13f in the axial direction, not only the rotation of the bracket B but also the movement restriction in the axial direction can be achieved. Since the movement of the bracket B in the axial direction can be reliably prevented from detaching the end portion 20a of the pinion support shaft 20 through which the bracket B is inserted from the engaging recess 13fa, the bracket B is more securely attached to the ring gear 13. Easy and accurate assembly is possible, and the assembly workability is further improved.

  Further, in the state where the differential gear mechanism DG is assembled in the differential case DC through the assembly process of FIG. 6, the movement restriction means S restricts the movement of the pinion gear 21 toward the radially inward side with respect to the pinion support shaft 20. The sliding of the bracket B supporting the back surface 21f of the pinion gear 21 with respect to the pinion support shaft 20 is also restricted, and the bracket B can be accurately held at a fixed position on the pinion support shaft 20. In addition, in the present embodiment, the pinion gear 21 and the side gears 22 and 23, which are bevel gears, cooperate with each other to constitute the movement restricting means S, that is, the pinion gear 21 with respect to the pinion support shaft 20 (accordingly, the meshing between the bevel gears). Since the movement of the bracket B) in the radially inward direction can be restricted, a dedicated part for movement restriction is not necessary, and the number of parts can be reduced, and the cost can be reduced.

  Furthermore, in the differential device D of the present embodiment, various types of models in which the relative position in the radial direction between the back surface 21f of the pinion gear 21 and the inner peripheral portion of the ring gear 13 is different (for example, the inner ring gear 13 Of the bracket B when the peripheral portion is separated from the radially outer side, or the rear surface 21f of the pinion gear 21 is radially separated from the inner peripheral portion of the ring gear 13. Changing the model (more specifically, the axial length of the cylindrical bracket body 24) makes it possible to easily cope with model changes.

  For example, if it is attempted to cope with the change in the radial width of the flange portion 13f of the ring gear 13 without changing the size of the bracket B, the weight of the ring gear 13 itself increases not only slightly, resulting in an increase in cost and handling. Causes problems such as inconvenience. On the other hand, if the problem can be solved by simply changing the size (axial length) of the bracket B as in the present embodiment, the above problem can be solved or sufficiently reduced, so that the cost and weight of the differential device D can be reduced. Can contribute.

  FIG. 7 shows a second embodiment of the present invention. In the first embodiment, the entire back surface 21f having a smaller diameter than the washer 26 of the pinion gear 21 is supported on the end surface 25f of the gear receiving portion 25 of the bracket B via the washer 26. However, in the second embodiment, A small protrusion 21ft having a diameter smaller than that of the washer 26 is integrally provided on the rear surface 21f of the pinion gear 21 having a diameter larger than that of the washer 26, and the tip surface of the small protrusion 21ft is connected to the bracket B via the washer 26. The end face 25f of the gear receiving portion 25 is supported.

  Other configurations of the second embodiment are the same as those of the first embodiment. Accordingly, the constituent elements of the second embodiment are given the reference numerals corresponding to the corresponding constituent elements of the first embodiment, and further description thereof is omitted. Also in the second embodiment, it is possible to achieve the same operational effects as in the first embodiment.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment, A various design change is possible in the range which does not deviate from the summary.

  For example, in the above-described embodiment, the differential device D is accommodated in the transmission case 10 of the automobile. However, the differential device D is not limited to the differential apparatus for automobiles, and is used for various mechanical devices. It can be implemented as a differential device. In the above embodiment, the differential device D is applied to the drive system of the left and right wheels, and the power is distributed while allowing differential rotation with respect to the left and right wheels. The differential device may be applied to a front / rear wheel drive system in a front / rear wheel drive vehicle to distribute power to the front / rear wheels while allowing differential rotation.

  In the above-described embodiment, the pair of pinion gears 21 are rotatably supported on the differential case DC via the single pinion support shaft 20. However, three or more pinion gears 21 are arranged radially from the center of the differential case. The pin case may be rotatably supported by the differential case via a pinion support shaft extending in the direction.

  In the above embodiment, the end face 25f of the gear receiving portion 25 of the bracket B, the back face 21f of the pinion gear 21 and the washer 26 are formed in a spherical shape. The end surface 25f, the back surface 21f, and the washer 26) may be formed in a tapered surface shape, or may be formed in a planar shape orthogonal to the second axis X2.

  Moreover, in the said embodiment, although the ring gear 13 which integrated the driven gear part 13mg on the outer periphery was illustrated as an input member, the input member of this invention is not limited to the structure of embodiment, For example, the rotational drive from a power source A ring-shaped member in which a driven gear or other driven member to which force is input is connected to the outer periphery by retrofitting may be used as the input member.

  Moreover, in the said embodiment, the engaging recessed part 13fa as a support shaft engaging part which engages the edge part 20a of the pinion support shaft 20 from the axial direction outward crosses the flange part 13f in the axial direction (accordingly, the flange part 13f). Although illustrated in a groove shape (opened on both side surfaces), the support shaft engaging portion of the present invention is not limited to the structure of the embodiment, for example, only on the inner peripheral surface and one side surface of the flange portion 13f. The opened notch-like recess may be used as the support shaft engaging portion.

  In the embodiment, in order to define the outward sliding limit of the bracket B on the pinion support shaft 20, the bottom surface 24 cb of the notch-shaped recess 24 c of the bracket body 24 is used as the inner periphery of the flange portion 13 f of the ring gear 13. Although what is contact | abutted to an end was shown, the prescription | regulation means of the outward sliding limit of the bracket B is not limited to embodiment. For example, as compared with the above-described embodiment, the notch depth of the notch-shaped recess 24c is increased and the outer end of the bracket body 24 is extended toward the ring gear body 13m so that the outer end surface 24e of the bracket body 24 is connected to the ring gear. The outer sliding limit of the bracket B may be defined by contacting the inner peripheral surface of the main body 13m. In this case, the outer end face 24e of the bracket body 24 is cut out with the notch-like recesses 11ac and 12ac for preventing bracket interference provided in the open ends 11a and 12a of the cover parts 11 and 12 as bottoms. Do not interfere with the recesses 11ac, 12ac.

B ... Bracket (supporting member)
D ... Differential gear O, O '... Opening S ... Movement restriction means 13 ... Ring gear (input member)
13f... Flange portion 13fa... Engaging recess (support shaft engaging portion)
20 ... Pinion support shaft (differential gear support shaft)
21 ... Pinion gear (differential gear)
21f · · · rear 22 and 23 · · · side gear (output gear)
24cs ... inner surface (flange contact surface)

Claims (4)

A plurality of differential gears (21), at least one differential gear support shaft (20) that supports the plurality of differential gears (21), the plurality of differential gears (21), and the differential gear support An input member (13) which accommodates the shaft (20) and transmits a rotational force input from a power source to the differential gear support shaft (20) to rotate together with the differential gear support shaft (20). And a pair of output gears (22, 23) meshing with the plurality of differential gears (21) from both sides in the axial direction,
The differential gear support shaft (20) is slidably inserted while being interposed between the back surface (21f) of the plurality of differential gears (21) and the inner peripheral surface of the input member (13). A plurality of supporting members (B)
The input member (13) has a radially inward flange portion (13f) on the inner peripheral portion,
The flange portion (13f) engages with the differential gear support shaft (20) so that the rotational force of the input member (13) can be transmitted to the differential gear support shaft (20). The support shaft engaging portion (13fa) has openings (O, O ') that can engage the differential gear support shaft (20) from the outside in the axial direction. And
The support member (B) is in contact with the flange portion (13f) and restricts the rotation of the support member (B) around the differential gear support shaft (20) to at least one flange contact surface (24cs). A differential device characterized by comprising:   The at least one flange contact surface (24cs) includes at least a pair of flange contact surfaces (24cs) opposed to each other with the flange portion (13f) interposed therebetween in the axial direction. The differential as described.   3. A movement restricting means (S) for restricting movement of the differential gear (21) toward the radially inward side with respect to the differential gear support shaft (20) is provided. Differential.   4. The differential device according to claim 3, wherein the movement restricting means (S) is constituted by the output gear (22, 23) and the differential gear (21), each of which is a bevel gear.

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