JP2019086052A - Differential device - Google Patents

Abstract

To suppress occurrence of misalignment of output gears to each other in a differential device.SOLUTION: A differential device 10 includes differential gears 20 housed in an input member 7, and a pair of output gears 31, 32 engaged with the differential gears 20. Intermediate wall portions 31w, 32w of the pair of output gears 31, 32 respectively have projecting portions 101, 102 projecting to an axial inner side with respect to axial inner end faces of the intermediate wall portions 31w, 32w. At least one of the projecting portions 101, 102 has a step portion 101s; 102s in an axial direction. The step portion has a first face 101s1; 102s1 as a tip face of one of the projecting portions, a second face 101s2; 102s2 formed at an axial outer side with respect to the first face and rotatably and slidably kept into contact with a tip face 102s1; 101s1 of the projecting portion of the other output gear, and a connection face 101s3; 102s3 connecting the first face and the second face and relatively rotatably fitted to at least a part of the side face 102s3; 101s3 of the projecting portion of the other output gear.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a differential gear applied to a vehicle such as a car.

  An input member, a plurality of differential gears accommodated in the input member, and a pair of output gears accommodated in the input member and rotatable around a rotation axis and meshed with each of the plurality of differential gears There is conventionally known a technology in which the axially inner ends (tips on the axially inner side) of the respective output gears of the pair of output gears abut each other in the differential gear provided with the (see, for example, the following patent documents) See 1, 2).

German Patent Publication 102011085121A German patent publication 102010033131A

  However, in the differential devices of Patent Documents 1 and 2, an output caused by a thrust reaction force that the input member receives from an input portion (for example, a final driven gear) or a meshing reaction force that the output gear receives from the differential gear. No mention is made of the occurrence of mutual misalignments (e.g. misalignment) of the gears.

  The present invention has been proposed in view of the above, and an object thereof is to provide a differential device capable of suppressing the occurrence of mutual misalignment of output gears.

  In order to achieve the above object, one differential device according to the present invention includes an input member, a plurality of differential gears accommodated in the input member, and the rotation member, which is accommodated in the input member. And a pair of output gears rotatable and meshing with each of the plurality of differential gears, each of the pair of output gears meshing with the shaft portion and each of the plurality of differential gears The output gear has a tooth portion and an intermediate wall portion connecting between the shaft portion and the tooth portion, and each of the intermediate wall portions is connected to an axial inner end surface of the output gear of the intermediate wall portion. An axially stepped portion of the output gear is formed on the convex portion of at least one of the output gears, and the stepped portion is formed by A first surface which is the tip surface of the convex portion of the output gear of the first gear, and the first surface before the first surface A second surface formed on the axially outward side of the output gear and in contact with the tip end surface of the convex portion of the other opposing output gear rotatably slidably, the first surface, and the second surface And at least a part of the side surface of the convex portion of the other output gear, and a connecting surface fitted so as to be relatively rotatable around the rotation axis.

  Preferably, an axial step of the output gear is formed in each of the convex portions of the pair of output gears, and at least one of the steps is the convex of the one output gear. The first surface, which is the front end surface of the part, and the axially outer side of the output gear with respect to the first surface, and the rotational sliding with the front end surface of the convex portion of the other opposing output gear The second surface to be brought into contact with each other, the first surface and the second surface are connected, and at least a part of the side surface of the convex portion of the other output gear is fitted around the rotational axis relatively rotatably. And a mating connection surface.

  Also preferably, an axial step portion of the output gear is formed in each of the convex portions of the pair of output gears, and each of the step portions is an end surface of the convex portion. A second surface which is formed on one surface and axially outward of the output gear with respect to the first surface, and rotatably and slidably abuts on a tip end surface of the convex portion of the other opposing output gear And a connection surface connecting the first surface and the second surface, and at least a part of the side surface of the convex portion of the other output gear and relatively rotatably fitted around the rotation axis. Have.

  In order to achieve the above object, another differential device according to the present invention includes an input member, a plurality of differential gears accommodated in the input member, and the rotation axis accommodated in the input member. And a pair of output gears rotatable around and meshed with each of the plurality of differential gears, each of the pair of output gears including a shaft portion and each of the plurality of differential gears It has a tooth part which meshes, and an intermediate wall part which connects between the above-mentioned axial part and the above-mentioned tooth part, and each of the above-mentioned intermediate wall parts is the above-mentioned axial direction end face in the output gear of the above-mentioned intermediate wall part In the output gear, there is provided a protrusion projecting inward in the axial direction, and the protrusion of at least one of the intermediate wall portions has its tip end surface rotated to the axially inner end face of the output gear of the other intermediate wall portion. It slidably contacts and the side surface of the convex portion In mesh relatively rotatably fitted with the side parts about said rotational axis.

  According to the present invention, the occurrence of mutual misalignment of output gears can be suppressed.

Sectional drawing which shows typically the whole structure of the differential device which concerns on 1st Embodiment of this invention (A1-A1 sectional view taken on the line of FIG. 2). A2-A2 line sectional view of FIG. 1 A3 arrow enlarged view of FIG. 1 An enlarged sectional view of an essential part of a differential gear according to a second embodiment of the present invention (corresponding to FIG. 3) Principal part expanded sectional view of the differential gear which concerns on 3rd Embodiment of this invention (FIG. 3 corresponding view) FIG. 3 is an enlarged sectional view of an essential part of a differential gear according to a fourth embodiment of the present invention (corresponding to FIG. 3). Principal part expanded sectional view of the differential gear which concerns on 5th Embodiment of this invention (figure corresponding to FIG. 3)

  Embodiments of the present invention will be described below based on the attached drawings.

  First, a differential gear 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. The automobile includes a transmission case 11 which is disposed beside an engine (not shown) as an on-vehicle power source and accommodates a transmission (not shown) and the differential device 10. In the transmission case 11, inner end portions of left and right first and second output shafts 5a and 5b which are respectively connected to the axles and rotatable about a first axis X1 are inserted. The inner end portions of the first and second output shafts 5a and 5b are coupled to a pair of output portions (first and second side gears 31 and 32 described later) of the differential device 10.

  For example, annular seal members 6a and 6b are mounted between the transmission case 11 and the first and second output shafts 5a and 5b. The seal members 6a and 6b seal between the first and second output shafts 5a and 5b, which rotate relative to the transmission case 11, in a fluid-tight manner. In the present embodiment, an oil pan (not shown) for storing a predetermined amount of lubricating oil is formed at the bottom of the transmission case 11 so as to face the inner space of the transmission case 11. The lubricating oil (lubricant) stored in the oil pan is surrounded by the rotation of the differential case 7 described later and the operation of the reduction gear mechanism 8 transmitting power from the power source to the differential case 7 in the internal space of the transmission case 11. It is scraped up and scattered. The lubricating oil splashes the inside of the transmission case 11 lubricates a mechanical motion part existing inside and outside the differential case 7 described later.

  The differential gear 10 is, for example, a differential case (input member) 7 supported on the transmission case 11 rotatably around a first axis (rotational axis) X1 via first and second bearings 9a and 9b, and the differential case 7 A differential gear mechanism 12 housed inside and a ring member (driven member, input member) 13 fixed (eg, welded) to the outer peripheral end of the differential case 7 are provided.

  The ring member 13 has, for example, a tooth portion 13g formed of helical teeth on the outer peripheral surface. Therefore, the ring member 13 functions as, for example, a final driven gear (input receiving portion). Further, the tooth portion 13g meshes with a tooth portion formed of a helical tooth of the drive gear 81 of the reduction gear mechanism 8 in the transmission. Thus, the power of the engine is transmitted from the transmission to the differential case 7 through the ring member 13.

  The differential case 7 has, for example, first and second cover members 71 and 72 sandwiching the differential gear mechanism 12 in the direction along the first axis X1, that is, the axial direction of the differential case 7 (axial direction of side gears 31 and 32 described later). And a cylindrical ring body 73 disposed between the first and second cover members 71 and 72 and coupled to the outer peripheral end of each of the first and second cover members 71 and 72.

  Further, the first cover member 71 and the second cover member 72 cover, for example, the differential gear mechanism 12 from one side and the other side in the axial direction of the differential case 7. Further, at least one of the first and second cover members 71 and 72 is provided with a through hole (not shown) through which lubricating oil can flow, for example, to allow the inside of the differential case 7 and the transmission case 11 to communicate with each other.

  The first cover member 71 has, for example, a flat first side wall 71c formed in a circular ring shape centered on the first axis X1, and a first side gear 31 described later from the inner peripheral end of the first side wall 71c. And a first boss portion 71b extending outward in the axial direction (that is, the side opposite to the surface facing the second cover member 72). Further, the first boss portion 71b is supported by the transmission case 11 via the first bearing 9a.

  The second cover member 72 has, for example, a flat second side wall portion 72c formed in a circular ring shape centered on the first axis line X1, and a second side gear 32 described later from the inner peripheral end portion of the second side wall portion 72c. And a second boss portion 72b extending outward in the axial direction (i.e., the side opposite to the surface facing the first cover member 71). The second boss 72b is supported by the transmission case 11 via the second bearing 9b.

  The ring body 73 covers the differential gear mechanism 12 from the radially outer side of the differential case 7 (the radial outer side of the side gears 31 and 32 described later). Further, the connection between the ring body 73 and the first cover member 71 is performed using a plurality of first bolts 74a. Further, the connection between the ring body 73 and the second cover member 72 is performed using a plurality of second bolts 74 b. The connection means between the ring body 73 and the first and second cover members 71 and 72 is not limited to this embodiment, and various connection means other than bolts (for example, welding, caulking, press fitting, etc.) may be used. Good.

  The differential gear mechanism 12 includes, for example, a plurality of (for example, two) pinion gears (differential gears) 20 rotatably supported around the second axis X2 orthogonal to the first axis X1 in the differential case 7 and the differential case 7. A pair of side gears (output gears) 31 and 32 (i.e., first side gears (one output gear, the other output gear, one side gear) rotatably supported around the first axis X1 and meshed with the plurality of pinion gears 20 respectively. The other side gear 31) and the second side gear (the other output gear, one output gear, the other side gear, one side gear) 32).

  For example, each pinion gear 20 integrally includes a tooth portion 20g having a plurality of teeth formed by bevel teeth, and a pinion shaft 20j projecting outward in the radial direction of the side gears 31 and 32 from the back surface of the tooth portion 20g. Have to. The pinion shaft 20j is rotatably supported by a support hole 73h provided in the ring body 73. Further, the rear surface (that is, the end surface on the radially outer side of the side gears 31 and 32) of the tooth portion 20g of the pinion gear 20 is rotatably slidably supported on the inner peripheral surface of the ring body 73 via the pinion gear washer 40. . The pinion gear washer 40 may be omitted, and the rear surface of the tooth portion 20g of the pinion gear 20 may be directly supported by the ring 73 so as to be rotatable and slidable.

  The first side gear 31 is formed in, for example, a flat circular ring shape centering on the first axis X1, a shaft 31j having the first axis X1 as a central axis, a tooth 31g meshing with each of the pinion gears 20, and And an intermediate wall portion 31w integrally connecting the shaft portion 31j and the tooth portion 31g. Further, the tooth portion 31g has a plurality of teeth which are, for example, bevel teeth. Further, the rear surface of the tooth portion 31 g (that is, the end surface on the axially outer side of the first side gear 31) is provided on the inner side surface of the first side wall portion 71 c of the first cover member 71 via the side gear washer 41. It is rotatably slidably supported.

  Further, in the present embodiment, the outer peripheral portion of the shaft portion 31 j is fitted to the inner peripheral portion of the first boss portion 71 b of the first cover member 71 via a clearance. The outer peripheral portion of the shaft portion 31j may be rotatably supported by the inner peripheral portion of the first boss portion 71b. On the other hand, the inner peripheral portion of the shaft portion 31j is fitted (for example, spline fitted) slidably and relatively non-rotatably in the axial direction of the first side gear 31 with the outer periphery of the inner end portion of the first output shaft 5a.

  The side gear washer 41 may be interposed between the back surface of the middle wall 31 w of the first side gear 31 and the inner side surface of the first side wall 71 c of the first cover member 71. Alternatively, the washer 41 for the side gear is omitted, and the back surface of the tooth portion 31g or the intermediate wall portion 31w of the first side gear 31 corresponds to the inner side surface of the corresponding first cover member 71 (more specifically, the first side wall portion 71c (2) directly on the inner surface of

The intermediate wall portion 31 w integrally has, for example, a convex portion 101 that protrudes inward in the axial direction of the side gear 31 from an axial inner end surface of the side gear 31 of the intermediate wall portion 31 w. Further, at an end portion of the convex portion 101, an axial step portion of the side gear 31 (more specifically, a step portion having a difference in height in the axial direction of the side gear 31) 101s is formed.
Further, the stepped portion 101s of the convex portion 101 is, for example, a first surface (tip surface) 101s1 that is an axial tip surface of the side gear 31 of the convex portion 101 and an axial outward direction of the side gear 31 than the first surface 101s1. It has a second surface 101s2 formed on the side, and a connection surface 101s3 connecting the first surface 101s1 and the second surface 101s2. Further, the connection surface 101s3 corresponds to a step surface connecting the high level surface (more specifically, the first surface 101s1) and the low level surface (more specifically, the second surface 101s2) in the step portion 101s. That is, the connection surface 101s3 forms a part of the side surface of the convex portion 101.

  The second side gear 32 is formed in, for example, a flat circular ring shape centered on the first axis X1, a shaft 32j having the first axis X1 as a central axis, a tooth 32g meshing with each of the pinion gears 20, and And an intermediate wall 32w integrally connecting the shaft 32j and the tooth 32g. In addition, the tooth portion 32g has a plurality of teeth that are configured by, for example, bevel teeth. Further, the rear surface of the tooth portion 32g (that is, the end surface on the axially outer side of the second side gear 32) is provided on the inner side surface of the second side wall portion 72c of the second cover member 72 via a side gear washer (washer) 42. It is rotatably slidably supported.

  Further, in the present embodiment, the outer peripheral portion of the shaft portion 32 j is rotatably supported by the inner peripheral portion of the second boss portion 72 b of the second cover member 72. On the other hand, the inner peripheral portion of the shaft portion 32j is fitted (for example, spline fitted) slidably and relatively non-rotatably in the axial direction of the outer periphery of the inner end portion of the second output shaft 5a and the second side gear 32.

  The side gear washer 42 may be interposed between the back surface of the middle wall 32 w of the second side gear 32 and the inner side surface of the second side wall 72 c of the second cover member 72. Alternatively, the side gear washer 42 may be omitted, and the tooth portion 32g of the second side gear 32 or the back surface of the intermediate wall 32w may be the inner surface of the corresponding second cover member 72 (more specifically, the second side wall 72c). (2) directly on the inner surface of

  The intermediate wall portion 32 w integrally has, for example, a convex portion 102 projecting inward in the axial direction of the side gear 32 from the axial inner end surface of the side gear 32 of the intermediate wall portion 32 w. Further, at an end portion of the convex portion 102, an axial step portion of the side gear 32 (more specifically, a step portion having a difference in height in the axial direction of the side gear 32) 102s is formed.

  Further, the stepped portion 102s of the convex portion 102 is, for example, a first surface (distal end surface) 102s1 which is an axial direction distal end surface of the side gear 32 of the convex portion 102 and an axial outward direction of the side gear 32 than the first surface 102s1. It has a second surface 102s2 formed on the side, and a connection surface 102s3 connecting the first surface 102s1 and the second surface 102s2. The connection surface 102s3 corresponds to a step surface connecting the high level surface (more specifically, the first surface 102s1) and the low level surface (more specifically, the second surface 102s2) in the step portion 102s. That is, the connection surface 102s3 forms a part of the side surface of the convex portion 102.

  By the way, each of the second surfaces 101s2 and 102s2 of the convex portions 101 and 102 contacts the first surfaces 102s1 and 101s1 of the opposing convex portions 102 and 101 rotatably and slidably. That is, the second surfaces 101s2 and 102s2 of one of the convex portions 101 and 102 abut on the axially distal end surfaces (tip surfaces) 102s1 and 101s1 of the side gears 32 and 31 of the other convex portions 102 and 101 in a rotatable and slidable manner .

  Further, each of the connection surfaces 101s3 and 102s3 of the convex portions 101 and 102 is concentric with the connection surfaces 102s3 and 101s3 of the step portions 102s and 101s of the opposing convex portions 102 and 101 (more specifically, the first axis X1 Relatively rotatably fitted around). That is, the connecting surfaces 101s3 and 102s3 of one of the convex portions 101 and 102 can be relatively rotated concentrically (more specifically, around the first axis X1) with at least a part of the side surface of the other convex portion 102 or 101 Is fitted to. In the present embodiment, the connection surfaces 101s3 and 102s3 are cylindrical surfaces having the first axis X1 as a central axis, but the present invention is not limited to this. In the present invention, for example, the connection surfaces 101s3 and 102s3 may be formed as tapered surfaces inclined with respect to the first axis X1.

Next, the operation of the first embodiment will be described.
In the differential gear 10 of the present embodiment, when the ring member 13 and the differential case 7 receive rotational force from the engine via the reduction gear mechanism 8, the pinion gear 20 does not rotate around the second axis X 2. When revolving around the central axis (i.e., the first axis X1) of the differential case 7, the first and second side gears 31, 32 are rotationally driven at the same speed from the differential case 7 via the pinion gear 20. Thus, the driving forces of the first and second side gears 31 and 32 are uniformly transmitted to the left and right first and second output shafts 5a and 5b. When a difference in rotational speed occurs between the first and second output shafts 5a and 5b due to turning of the vehicle, etc., the pinion gear 20 revolves around the first axis X1 while rotating about the second axis X2, The rotational drive force is transmitted while permitting differential rotation from the pinion gear 20 to the first and second side gears 31 and 32. The above is the same as the operation of the conventionally known differential device.

  Further, in assembling the differential device 10 of the present embodiment, for example, a first subassembly in which the back side of the first side gear 31 is supported on the inner side surface of the first cover member 71 via the side gear washer 41 A second subassembly in which the back surface side of the second side gear 32 is supported on the inner surface of the second cover member 72 via the side gear washer 42 and the pinion gear washer 40 on the inner peripheral surface of the ring body 73 A third subassembly in which the rear surface of the pinion gear 20 is supported and the pinion shaft portion 20j is fitted in the support hole 73h of the ring body 73 is separately assembled in advance.

  Next, the first and second cover members 71 and 72 of the first and second subassemblies and the ring body 73 of the third subassembly are mounted on the first and second side gears 31 and 32, respectively. And the protrusions 101 and 102 of the intermediate wall portions 31w and 32w of the first and second side gears 31 and 32 are aligned with each other so as to be engaged with each other. Subsequently, the differential case 7 is assembled by connecting the first and second cover members 71 and 72 and the ring body 73 with the first and second bolts 74a and 74b. Thereafter, the ring member 13 is joined to the outer peripheral portion of the differential case 7 by welding or the like, whereby the assembly of the differential gear 10 is completed. Thereafter, the differential case 7 is attached to the transmission case 11 via the first and second bearings 6a and 6b. The transmission case of the differential gear 10 is obtained by inserting the inner end portions of the first and second output shafts 5a and 5b into the inner circumferences of the shaft portions 31j and 32j of the first and second side gears 31 and 32, for example. Assembly to 11 is performed.

  The lubricating oil (lubricant) scattered in the transmission case 11 during the operation of the differential gear 10 is, for example, the first and second output shafts 5 a and 5 b and the first and second side gears 31 and 32. The inside and the outside of the differential case 7 are circulated through the spline fitting portion and through holes (not shown) provided in the first and second cover members 71 and 72. Therefore, the movable part in the differential case 7 can be lubricated by the lubricating oil scattering in the transmission case 11.

  By the way, during operation of the differential gear 10, the differential case 7 receives a large thrust reaction force when, for example, rotational driving force is input from the ring member 13. Then, the thrust reaction force extends to the first and second side gears 31 and 32 whose rear surfaces are supported by the differential case 7. In addition, a meshing reaction force with the pinion gear 20 also acts on the first and second side gears 31 and 32. Therefore, in the conventional differential device, misalignment between the first and second side gears 31 and 32 (for example, both side gears 31 and 32) is caused by the thrust reaction force and the meshing reaction force. (A slight offset of the shaft center of the shaft and a surface shift of the shaft centers of the side gears 31 and 32 slightly inclined) occur, causing a reduction in the transmission efficiency of the differential and an increase in operation noise. There was a fear.

  However, in the present embodiment, each of the intermediate wall portions 31w, 32w of the first and second side gears 31, 32 has an axial direction in the side gears 31, 32 from an axial inner end surface of the side gears 31, 32 in the intermediate wall portions 31w, 32w. It has the annular convex parts 101 and 102 which protrude inward and mutually oppose. Further, step portions 101s and 102s in the axial direction of the side gears 31 and 32 are formed at the tip of each of the convex portions 101 and 102 over the entire circumference of the convex portions 101 and 102. Then, each of the step portions 101s and 102s of the convex portions 101 and 102 is formed by an annular first surface (tip surface) 101s1 and 102s1 which is an axial tip surface of the side gears 31 and 32 of the convex portions 101 and 102; The side gears 31 and 32 are formed on the outer side in the axial direction with respect to the one surface 101s1 and 102s1, and the other convex portions 102 and 101 rotate in the axial direction in the side gears 31 and 32 (tip surface) 102s1 and 101s1 It has annular 2nd surfaces 101s2 and 102s2 which contact slidably, and annular connection surfaces 101s3 and 102s3 which connect 1st surfaces 101s1 and 102s1 and 2nd surfaces 101s2 and 102s2.

  Therefore, in the middle wall portion 31 w of the first side gear 31 and the middle wall portion 32 w of the second side gear 32, the convex portions 101 and 102 protruding from the axial inner end surface of the side gears 31 and 32 are in the axial direction of the side gears 31 and 32. Directly in contact with each other so as to be rotatable and slidable. Thereby, the thrust load is efficiently transferred from the side wall 71c (72c) of one of the first and second cover members 71 and 72 of the differential case 7 to the other side wall 72c (71c) through the side gears 31 and 32. It can be transmitted well. Therefore, according to the present embodiment, the rigidity of the differential case 7 and the side gears 31, 32 with respect to the thrust load can be enhanced. Therefore, according to the present embodiment, even when the differential case 7 has a relatively flat case structure in the axial direction of the side gears 31 and 32, as in the present embodiment, for example, it contributes to the improvement of the rigidity of the entire differential gear 10. be able to.

  Further, in the stepped portions 101s and 102s of the convex portions 101 and 102 in the present embodiment, the connecting surfaces 101s3 and 102s3 are engaged with each other so as to be relatively rotatable concentrically (more specifically, around the first axis X1). There is. Therefore, according to the present embodiment, the thrust reaction force received by the differential case 7 from the ring member 13 and the meshing reaction force received by the first and second side gears 31 and 32 from the respective pinion gears 20, etc. The occurrence of 32 misalignments (e.g., misalignment and / or surface misalignment) can be suppressed. Therefore, according to the present embodiment, it is advantageous to improve the transmission efficiency of the differential device 10 and reduce the operation noise.

  Next, a differential according to a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the step portions 101s and 102s are respectively formed at the tip portions of the convex portions 101 and 102 of the intermediate wall portions 31w and 32w of the first and second side gears 31 and 32, and each step portion 101s (102s) The first surface 101s1 (102s1) of the second embodiment is rotatably slidably brought into contact with the second surface 102s2 (101s2) of the other stepped portion 102s (101s).

  On the other hand, in the second embodiment, the first surface (high-level surface, tip surface, axial tip surface) 201s1 of the stepped portion 201s of one side gear (for example, the first side gear 31) and the other side gear (for example, A clearance C2 is provided between the facing surface of the step portion 202s of the second side gear 32) and the second surface (lower surface) 202s2. Therefore, in the second embodiment, the rotatably slidable contact surfaces of the oppositely facing projections 201 and 202 are the second surface (lower surface) 201s2 of the step portion 201s of one side gear and the step of the other side gear It is only the contact surface with the first surface (high surface, tip surface, axial tip surface) 202s1 of the portion 202s. Thereby, the convex portions 201 and 202 (more specifically, the step portions 201s and 202s) of the second embodiment are relatively easy in accuracy management in processing compared to the convex portions 101 and 102 of the first embodiment. It becomes.

  The other structure of the second embodiment is basically the same as that of the first embodiment, so the second embodiment can achieve the same effect as that of the first embodiment. In the second embodiment, the connection surfaces 201s3 and 202s3 are cylindrical surfaces having the first axis X1 as a central axis, but the present invention is not limited to this. In the present invention, for example, the connection surfaces 201s3 and 202s3 may be formed as tapered surfaces inclined with respect to the first axis X1.

  Next, a differential according to a third embodiment of the present invention will be described with reference to FIG. In the first and second embodiments, the stepped portions 101s and 102s are formed on any of the tips of the convex portions 101 and 102 of the intermediate wall portions 31w and 32w of the first and second side gears 31 and 32, respectively. . On the other hand, in the third embodiment, the tip of the convex portion 302 of one side gear (for example, the second side gear 32) does not have an axial step portion of the side gear 32.

  In the third embodiment, the axial direction end surface (end surface) 302t of the side gear 32 of the convex portion 302 of one side gear (for example, the second side gear 32) is the other side gear (for example, the first side gear 31). The second surface (lower surface) 301 s 2 of the step portion 301 s formed at the tip end portion of the convex portion 301 is in contact with the second surface 301 s so as to be rotatable and slidable. Then, the axially inner end face of the side gear 32 and the first surface of the step 301 s of the step 301 s of the convex portion 301 of the other side gear of the intermediate wall portion 32 w in the radial direction of the side gear 32 of the convex portion 302 of one side gear A clearance C3 is provided between the high potential surface, the tip surface, and the axial direction tip surface 301s1. As a modification of the third embodiment, the clearance C3 is eliminated, and the axially inner end surface of the side gear 32 of the intermediate wall portion 32w of the peripheral side in the radial direction of the side gear 32 of the convex portion 302 of one side gear The first surface 301s1 of the step portion 301s of the convex portion 301 of the side gear may be in contact with the first surface 301s so as to be capable of rotational sliding.

  In the third embodiment, the opposing side surfaces of the convex portions 301 and 302 (more specifically, the connecting surface 301s3 of the stepped portion 301s of the convex portion 301 and the side surface 302f opposing the connecting surface 301s3 of the convex portion 302) Are respectively formed on a cylindrical surface around the first axis X1 and are fitted rotatably relative to each other. That is, the connecting surface 301s3 of the convex portion 301 is fitted in a relatively rotatable manner concentrically with a part of the side surface 302f of the convex portion 302 (more specifically, around the first axis X1). In the third embodiment, the connection surface 301s3 and the side surface 302f may be formed into a tapered surface inclined with respect to the first axis X1.

  The other structure of the third embodiment is basically the same as that of the second embodiment, and thus the third embodiment can achieve the same effect as that of the second embodiment.

  Next, a differential according to a fourth embodiment of the present invention will be described with reference to FIG. In the differential gear in the third embodiment, the tip end surface 302t of the convex portion 302 of one side gear (for example, the second side gear 32) having no step portion is the convex of the other side gear (for example, the first side gear 31) It is in contact with the second surface 301s2 of the step portion 301s of the portion 301 so as to be rotatable and slidable. On the other hand, in the differential gear in the fourth embodiment, the end face 401t of the convex portion 401 of one side gear (for example, the first side gear 31) having no step and the other side gear (for example, the second side gear) A clearance C4 is provided between the second surface (lower surface) 402s2 of the step portion 402s of the convex portion 402).

  In the axial direction inner end face of the side gear 31 of the intermediate wall portion 31w around the radial direction of the side gear 31, 32 of the convex portion 401 of one side gear (for example, the first side gear 31), the other side gear (for example, The first surface (high-level surface, tip surface, tip end surface in the axial direction) 402s1 of the step (the step 402s in the axial direction of the side gear 32) formed at the tip of the convex portion 402 of the second side gear 32) It is slidably abutted. As a modification of the fourth embodiment, the clearance C4 may be eliminated, and the second surface 402s2 of the step 402s may be abutted rotatably and slidably on the tip surface 401t of the projection 401.

  Further, in the fourth embodiment, the opposing side surfaces of the convex portions 401 and 402 (more specifically, the connecting surface 402s3 of the step portion 402s of the convex portion 402 and the side surface 401f opposing the connecting surface 402s3 of the convex portion 401) Are respectively formed on a cylindrical surface around the first axis X1 and are fitted rotatably relative to each other. That is, the connecting surface 402 s 3 of the convex portion 402 is engaged with the side surface 401 f of the convex portion 401 in a relatively rotatable manner (more specifically, around the first axis X 1). In the fourth embodiment, the connection surface 402s3 and the side surface 401f may be formed as a tapered surface inclined with respect to the first axis X1.

  The other structure of the fourth embodiment is basically the same as that of the third embodiment, and thus the fourth embodiment can achieve the same effect as that of the third embodiment.

  Next, a differential according to a fifth embodiment of the present invention will be described with reference to FIG. In the first to fourth embodiments, at least one of the convex portions 101 to 401 and 102 to 402 of the intermediate wall portions 31 w and 32 w of the first and second side gears 31 and 32, axial step portions of the side gears 31 and 32. What formed 101s-401s, 102s-402s was shown. On the other hand, in the fifth embodiment, any convex portion 501, 502 of the first and second side gears 31, 32 does not have an axial step portion of the side gears 31, 32.

  In the fifth embodiment, the axial direction end surface (end surface) 502t of the side gear 32 of the convex portion 502 of one side gear (for example, the second side gear 32) is the one of the other side gear (for example, the first side gear 31). An axially inner end surface of the side gear 31 of the intermediate wall portion 31 w at the periphery in the radial direction of the side gear 31 of the convex portion 501 abuts rotatably slidably. In addition, the axially inner end surface of the side gear 32 and the other side gear (for example, the first side gear 32) of the intermediate wall portion 32w around the radial direction in the side gear 32 of the convex portion 502 of one side gear (for example, the second side gear 32). A clearance C5 is provided between an axial front end surface (front end surface) 501t of the side gear 31 of the convex portion 501 of the side gear 31). As a modification of the fifth embodiment, the clearance C5 is eliminated, and the side gear 32 of the intermediate wall portion 32w at the periphery in the radial direction of the side gear 31 of the convex portion 502 of one side gear (for example, the second side gear 32) The axially inner end surface and the axially distal end surface 501t of the side gear 31 of the convex portion 501 of the other side gear (for example, the first side gear 31) may be in contact in a rotatable and slidable manner.

  In the fifth embodiment, each of the convex portions 501 and 502 is formed in, for example, an annular shape around the first axis X1. And the mutually opposing side surface (opposing peripheral surface) 501f of the convex part 501,502 and 502f are mutually fitted relatively rotatably around the 1st axis line X1. In the fifth embodiment, the mutually opposing side surfaces (facing peripheral surfaces) 501f and 502f of the convex portions 501 and 502 may be formed as tapered surfaces inclined with respect to the first axis X1.

  The remaining structure of the fifth embodiment is basically the same as that of the fourth embodiment, so that the fifth embodiment can achieve the same effect as that of the fourth embodiment.

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

  For example, in the first to fifth embodiments, the differential gear is housed in a transmission case of a car, but the present invention is not limited to this. The differential according to the invention is not limited to differentials for motor vehicles, but can be implemented as differentials for various mechanical devices.

  Further, in the first to fifth embodiments, the differential device is applied to the transmission system of the left and right wheels of the vehicle, and it is shown that the power is distributed while permitting differential rotation with respect to the left and right drive shafts. However, the present invention is not limited to this. In the present invention, for example, the differential device is applied to the transmission system of the front and rear wheels in a front and rear wheel drive vehicle, and power is distributed while permitting differential rotation to the front and rear drive wheels. Good.

  In the first to fifth embodiments, the outer peripheral portion of the differential case 7 is provided with a ring member (driven member, input member) 13 having on the outer peripheral surface a tooth portion 13g serving as an input receiving portion receiving power from a power source. However, the present invention is not limited to this. In the present invention, for example, as a ring member having a driven portion, driven wheels other than the ring gear (for example, driven sprocket, driven pulley, etc.) may be coupled to the differential case (input member). Further, in the present invention, for example, various power transmission mechanisms connected to a power source on the outer surface of any one of the first and second cover members 71 and 72 of the first to fifth embodiments, or The output member of the reduction mechanism (for example, a planetary gear reduction mechanism) may be coupled.

  In the first to fifth embodiments, the pinion shaft (differential gear support member) 20j of the pinion gear (differential gear) 20 is integrally formed with the pinion gear 20. However, the present invention is not limited to this. In the present invention, for example, the pinion gear (differential gear) 20 and the pinion shaft (differential gear supporting member) rotatably supporting the pinion gear 20 through are separately provided and extended from the pinion gear 20 of the pinion shaft. The two end portions (that is, the radially inner end portion and the outer end portion of the side gears 31 and 32) may be supported by the ring body 73 or a support portion connected to the ring body 73. In this case, the support portion of the ring body 73 supporting the radially inner end of the side gears 31 and 32 of the pinion shaft interferes with the convex portions 101 to 501 and 102 to 502 of the intermediate wall portions 31w and 32w of the side gears 31 and 32. Not to be formed.

  In the first to fourth embodiments, the first surfaces 101s1 and 102s1 and the second surfaces 101s2 and 102s2 of the stepped portions 101s and 102s are formed in a plane orthogonal to the first axis X1. Is not limited to this. In the present invention, for example, at least a part of the first surfaces 101s1 and 102s1 or at least a part of the second surfaces 101s2 and 102s2 may be formed with a convex curved surface (for example, a spherical surface or a cylindrical surface) with respect to the mating surface.

  In the fifth embodiment, the tip surfaces 501t and 502t of the protrusions 501 and 502 are formed in a plane orthogonal to the first axis X1, but the present invention is not limited to this. In the present invention, for example, at least a part of the tip surfaces 501t and 502t of at least one of the convex portions 501 and 502 may be formed with a convex curved surface (for example, a spherical surface or a cylindrical surface) with respect to the mating surface.

X1 ..... First axis (rotational axis)
7 ... ... differential case (input member)
10 ····························· Pinion gear (differential gear)
31, 32 · · · First and second side gears (output gear, side gear, one output gear, other output gear, one side gear, other side gear)
31 g, 32 g · · · Tooth portion 31 j · 32 j · · · Shaft portion 31 w · 32 w · · · Intermediate wall portion 101 to 501, 102 to 502 · · · · 部 convex portion 101s to 301s, 102s, 202s · · · stepped portion 101s1 to 301s1, 102s1 302s 1 · · First surface (tip surface, axial tip surface, high-level surface)
101s2 to 301s2, 102s2, 202s2 ・ ・ the second surface (low order surface)
101s3 to 301s3, 102s3, 202s3, · · · Connection surface 101s3, 102s3, 202s, 402s 3 · · Connection surface (side surface)
302f, 401f, 501f, 502f ··· Side surface 501t, 502t · · · Tip surface

Claims (4)

An input member (7),
A plurality of differential gears (20) housed in said input member (7);
A pair of output gears (31, 32) accommodated in the input member (7) and rotatable around a rotation axis (X1) and meshed with each of the plurality of differential gears (20);
Equipped with
Each of the pair of output gears (31, 32) is
The shaft portion (31j, 32j),
Teeth (31g, 32g) meshing with each of the plurality of differential gears (20);
An intermediate wall (31w, 32w) connecting the shaft (31j, 32j) and the teeth (31g, 32g);
Have
Each of the intermediate wall portions (31w, 32w) is axially inward of the output gear (31, 32) from an axial inner end face of the output gear (31, 32) of the intermediate wall portion (31w, 32w) With convex parts (101 to 301, 102 to 302) protruding to the side,
An axial step (101s to 301s; 102s) of the output gear (31; 32) is formed on the convex portion (101 to 301; 102) of at least one of the output gears (31; 32). Yes,
The steps (101s to 301s; 102s) are:
A first surface (101s1 to 301s1; 102s1) to be a tip end surface of the convex portion (101 to 301; 102) of the one output gear (31; 32);
The projection (31, 32) of the first surface (101s1 to 301s1; 102s1) is formed on the axially outward side of the output gear (31, 32), and the convex portion (of the other output gear (32; 31) is opposed) A second surface (101s2 to 301s2; 102s2) rotatably and slidably abutted with a distal end surface (102s1 to 302s1; 101s1) of 102 to 302; 101), the first surface (101s1 to 301s1; 102s1), and Two surfaces (101s2 to 301s2; 102s2) are connected, and at least one of the side surfaces (102s3, 202s3, 302f; 101s3) of the convex portion (102 to 302; 101) of the other output gear (32; 31) And connecting surfaces (101s3 to 301s3; 102s3) fitted so as to be relatively rotatable around the rotation axis (X1) )When,
Have a differential. In each of the convex portions (101, 201, 102, 202) of the pair of output gears (31, 32), axial steps (101s, 201s, 102s, 202s) in the output gear (31, 32) are provided. ) Is formed,
At least one of the steps (101s, 201s; 102s, 202s)
A first surface (101s1, 201s1; 102s1, 202s1) to be a tip end surface of the convex portion (101; 102) of the one output gear (31; 32);
The convex of the other output gear (32; 31) is formed on the axially outer side of the output gear (31, 32) with respect to the first surface (101s1, 201s1; 102s1, 202s1) A second surface (101s2, 201s2; 102s2, 202s2) rotatably and slidably abutted with a tip surface (102s1, 202s1; 101s1, 201s1) of the part (102; 101);
The first surface (101s1, 201s1; 102s1, 202s1) and the second surface (101s2, 201s2; 102s2, 202s2) are connected, and the convex portion (102; 102) of the other output gear (32; 31) A connecting surface (101s3, 201s3; 102s3, 202s3) which is relatively rotatably fitted around at least a part of the side surface (102s3, 202s3; 101s3, 201s3) and the rotation axis (X1);
Have
The differential according to claim 1. In each of the convex portions (101, 201, 102, 202) of the pair of output gears (31, 32), axial steps (101s, 201s, 102s, 202s) in the output gear (31, 32) are provided. ) Is formed,
Each of the steps (101s, 201s, 102s, 202s) is
A first surface (101s1, 201s1, 102s1, 202s1) to be a tip end surface of the convex portion (101, 102);
The convex of the other output gear (32, 31) is formed on the axially outer side of the output gear (31, 32) with respect to the first surface (101s1, 201s1, 102s1, 202s1) A second surface (101s2, 201s2, 102s2, 202s2) rotatably and slidably abutted with an end surface (102s1, 202s1, 101s1, 201s1) of the part (102, 101);
The first surface (101s1, 201s1, 102s1, 202s1) and the second surface (101s2, 201s2, 102s2, 202s2) are connected, and the convex portion (102, 102) of the other output gear (32, 31) A connecting surface (101s3, 201s3; 102s3, 202s3) which is relatively rotatably fitted around at least a part of the side surface (102s3, 202s3, 101s3, 201s3) and the rotation axis (X1);
Have
The differential device according to claim 1. An input member (7),
A plurality of differential gears (20) housed in said input member (7);
A pair of output gears (31, 32) accommodated in the input member (7) and rotatable around a rotation axis (X1) and meshed with each of the plurality of differential gears (20);
Equipped with
Each of the pair of output gears (31, 32) is
The shaft portion (31j, 32j),
Teeth (31g, 32g) meshing with each of the plurality of differential gears (20);
An intermediate wall (31w, 32w) connecting the shaft (31j, 32j) and the teeth (31g, 32g);
Have
Each of the intermediate wall portions (31w, 32w) is axially inward of the output gear (31, 32) from an axial inner end face of the output gear (31, 32) of the intermediate wall portion (31w, 32w) With projections (401, 501, 402, 502) protruding to the side,
The convex portion (402, 502) of at least one of the intermediate wall portions (32w) has an end surface (402s, 502t) in the axial direction of the output gear (31, 32) of the other intermediate wall portion (31w). It is in contact with the inner end face so that it can rotate and slide
The side surface (402s, 502f) of the convex portion (402, 502) is around the side surface (401f, 501f) of the convex portion (401, 501) of the other intermediate wall portion (31w) and the rotation axis (X1) Relatively rotatably fitted,
Differential.

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