JP2018146020A - Differential device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a differential device capable of contributing to narrowing of a width.SOLUTION: A differential device 11 includes a plurality of differential gears 34, a plurality of differential gear supporting members 36 respectively supporting one differential gear 34, a supporting member 37 provided with a plurality of spaces capable of accommodating the plurality of differential gears 34 and supporting one end portion of each differential gear supporting member 36, a pair of output gears 35a, 35b respectively engaged with the plurality of differential gears 34, an input member 21 capable of accommodating the supporting member 37, the plurality of differential gears 34 and the plurality of differential gear supporting members 36 inside, a cover member 18 at one side, covering one side face of the supporting member 37 and connectable to the input member 21, and a cover member 19 at the other side covering the other side face of the supporting member 37 opposed to the cover member 18 at one side and connectable to the input member 21. The cover member 18 at one side has a plurality of supporting portions 26 supporting the other end portions of the plurality of differential gear supporting members 36 on the outer periphery, and the input member 21 covers the other ends of all of the differential gear supporting members 36.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a differential device mounted on a vehicle such as a four-wheeled vehicle.

  Conventionally, in a differential device, a technique for supporting one end of a short pinion shaft with a support member is known (for example, the second embodiment of Patent Document 1). Conventionally, there is known a technique in which an end portion of a pinion shaft is supported by a pinion flange portion integrally formed with a drive gear in a differential device without a differential case (for example, Patent Document 2).

Japanese Patent No. 516776 Korean Patent Application Publication No. 1020120001173

  However, Patent Document 1 and Patent Document 2 do not mention narrowing of the differential device. Therefore, in the technique combining the second embodiment of Patent Document 1 and Patent Document 2, the pinion flange portion integrally formed with the drive gear protrudes in the axial direction from the drive gear to the side gear. Therefore, it is difficult to reduce the width of the differential device by the technique combining the second embodiment of Patent Document 1 and Patent Document 2.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a differential device that can contribute to narrowing.

  To achieve the above object, one differential device according to the present invention includes a plurality of differential gears, a plurality of differential gear support members each supporting one differential gear, and the plurality of differential gears. A plurality of spaces in which gears can be accommodated, a support member that supports one end of the plurality of differential gear support members, a pair of output gears that respectively mesh with the plurality of differential gears, The support member, the plurality of differential gears, an input member capable of accommodating the plurality of differential gear support members therein, and one cover that covers one side surface of the support member and can be coupled to the input member And the other cover member that covers the other side surface of the support member that faces the one cover member and that can be coupled to the input member. Other differential gear support members End of has a plurality of support portions for supporting the said input member covers the other end of all of the differential gear support member.

  Preferably, the outer peripheral surface of the support member is in contact with the inner surface of the input member.

  According to the present invention, it is possible to contribute to the narrowing of the differential device.

It is sectional drawing which shows typically the whole structure of the differential gear which concerns on one Embodiment of this invention. It is a partial exploded perspective view of a differential.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically shows the overall configuration of a differential 11 according to an embodiment of the present invention. The automobile is provided with a transmission case (not shown) disposed next to an engine (not shown) as a power source mounted on the automobile and accommodating a transmission (not shown) and the differential device 11. The transmission case 12 supports a pair of left and right output shafts 13a and 13b that are respectively connected to the axle so as to be rotatable about the central axis CL. The two output shafts 13 a and 13 b are arranged coaxially with each other and each have one end coupled to the differential device 11 in the mission case 12.

  For example, annular seal members 14a and 14b are mounted between the transmission case 12 and the individual output shafts 13a and 13b. The seal members 14a and 14b liquid-tightly seal between the mission case 12 and the rotating output shafts 13a and 13b. In the present embodiment, an oil pan (not shown) that stores a predetermined amount of lubricating oil facing the internal space of the mission case 12 is formed at the bottom of the mission case 12. The lubricating oil stored in the oil pan is scooped up and scattered in the internal space of the mission case 12 by the rotation of the movable element of the reduction gear mechanism 15 and the differential case 16 described later. In this manner, the mechanical motion portions existing inside and outside the differential case 16 described later are lubricated by the lubricant scattered by the rotation of the movable element of the reduction gear mechanism 15 and the differential case 16 described later.

  The differential device 11 includes, for example, a differential case (input member) 16 that is supported by the transmission case 12 so as to be rotatable about the central axis CL, a differential gear mechanism 17 as a differential mechanism housed in the differential case 16, Is provided.

  The differential case 16 is, for example, a first cover member (one cover member, the other cover member) that covers one side surface (one side surface, the other side surface) of the differential gear mechanism 17 along a plane orthogonal to the central axis CL. ) 18 and a second cover member (the other side, the other side, one side) that covers the other side (the other side, one side) of the differential gear mechanism 17 facing the first cover member 18 along a plane orthogonal to the central axis CL Cover member 19, one cover member 19, and the first cover member 18 and the second cover member 19, and covers the differential gear mechanism 17 from a different direction from the first cover member 18 and the second cover member 19. And a ring member 21.

  The ring member (driven member) 21 is provided with outward gear teeth 22 on the outer peripheral surface. The gear teeth 22 are annularly arranged coaxially with the central axis CL. Further, the gear teeth 22 of the ring member 21 mesh with the gear teeth 23 of the reduction gear mechanism 15. Therefore, engine power is transmitted from the transmission to the differential case 16. Therefore, the ring member 21 functions as a so-called ring gear (driven gear), and also functions as an input member for inputting engine power to the differential device 11.

  The first cover member 18 includes, for example, a first cover body 24 formed in a ring shape having a space in the center with the central axis CL as the center, and a second cover member from the inner peripheral end of the first cover body 24. From a cylindrical first bearing portion (first boss portion) 25 that protrudes on the opposite side to the direction facing 19 (the axially outward side of side gears 35a and 35b described later), and the outer periphery of the first cover body 24 A plurality of flange portions that support one end portion (the other end portion) of each pinion shaft 36 that will be described later, protruding in the direction facing the second cover member 19 (the axially inner side of the side gears 35a and 35b described later). (Support part) 26.

  In the present embodiment, three flange portions 26 are formed at equal intervals in the circumferential direction of the first cover body 24. Each flange portion 26 has, for example, a shaft hole (a first support hole, a second support hole, and a third support hole) that can support one end portion (the other end portion) of a pinion shaft 36 described later. 27 and a receiving surface 28 for receiving a pinion gear 34, which will be described later, formed by a partial spherical surface of the center C on the central axis CL forming the inner peripheral surface of the flange portion 26.

  Moreover, in this embodiment, although the three flange parts 26 were formed in the circumferential direction of the 1st cover body 24 at equal intervals, this invention is not limited to this. In the present invention, for example, two, four, five, etc. may be formed in accordance with the number of pinion gears 34 described later.

  The second cover member 19 includes, for example, a second cover body 31 formed in a ring shape having a space in the center with the center axis CL as the center, and a first cover from the inner peripheral end of the second cover body 31. A cylindrical second bearing portion (second boss portion) 32 that protrudes on the opposite side to the direction facing the cover member 18 (the axially outward side of side gears 35a and 35b described later).

  The differential gear mechanism 17 is, for example, a plurality of pinion gears (differential gears) 34 that are rotatably supported around a rotation axis 33 that is orthogonal to the central axis CL, and a plurality of differential gear mechanisms 17 that are rotatably supported around the central axis CL. A pair of side gears (output gears) 35 a, 35 b (that is, a first side gear (first output gear) 35 a and a second side gear (second output gear) 35 b) meshing with the pinion gear 34, and an axis coaxial with the rotation axis 33. A plurality of pinion shafts (shafts, differential gear support members) 36 that rotatably support each pinion gear 34 having a pin, and a support member 37 that supports the other end (one end) of each pinion shaft 36. And having.

  Each pinion gear 34 includes, for example, a support body 41 having a shaft hole 38 (a first support hole, a second support hole, and a third support hole) that rotatably receives the pinion shaft 36, and the diameter of the pinion gear 34 from the support body 41. And a gear tooth portion 42 protruding outward in the direction. The shaft hole 38 has a cylindrical shape coaxial with the rotation axis 33, for example. A plurality of gear teeth are annularly arranged around the axis of the pinion shaft 36 in the gear tooth portion 42.

Further, a slide surface 43 is formed on the back surface of the support body 41 so as to spread from the peripheral edge of the shaft hole 38 outward in the radial direction of the pinion gear 34 and be received by the receiving surface 28 of the flange portion 26 of the first cover member 18. The slide surface 43 is constituted by a partial spherical surface having a center C on the central axis CL, for example. A washer 44 may be interposed between the receiving surface 28 of the flange portion 26 of the first cover member 18 and the slide surface 43 of the pinion gear 34. (In this embodiment, a washer 44 is interposed between the receiving surface 28 of the flange portion 26 of the first cover member 18 and the slide surface 43 of the pinion gear 34.)
Each of the pair of side gears 35a and 35b includes, for example, a cylindrical shaft portion 46 having a shaft hole 45 into which the tip portions of the output shafts 13a and 13b are respectively spline-fitted, and the shaft portion 46 to the side gears 35a and 35b. An annular tooth portion 47 having gear teeth meshing with the plurality of pinion gears 34 at a position radially outward of the shaft, and axially inward end portions of the side gears 35a and 35b of the shaft portion 46. And an intermediate wall portion 48 formed in a ring plate shape extending outward in the radial direction of the side gears 35a and 35b toward the inner peripheral end portion of the tooth portion 47. The relative rotation of the first side gear 35 a and the second side gear 35 b is caused by the rotation of the pinion gear 34 around the rotation axis 33.

  The shaft portions 46 are covered with the corresponding first bearing portion 25 and second bearing portion 32, respectively. The output shafts 13a and 13b are fitted into the corresponding side gears 35a and 35b so as not to be relatively rotatable. In this way, the individual side gears 35a and 35b are rotatably supported by the bearings 49a and 49b via the differential case 16.

  The support member 37 includes, for example, a first main body 51 formed in an annular shape around the center axis CL, a second main body 52 positioned radially outward of the side gears 35a and 35b of the first main body 51, Have In the present embodiment, the first main body 51 and the second main body 52 are formed integrally.

  Referring also to FIG. 2, the first main body portion 51 supports, for example, one end portion (the other end portion) of each of the plurality of pinion shafts 36 at equal intervals in the circumferential direction of the side gears 35 a and 35 b. Shaft holes (first support hole, second support hole, third support hole) 56 and a plurality of connecting bodies (connecting body, first connecting body, connecting two adjacent shaft holes 56) First connection body) 53.

  For example, the second main body 52 is not formed radially outward of the shaft hole 56 of the first main body 51 and the side gears 35a and 35b around the shaft hole 56 (part of the coupling body 53). A plurality of connecting bodies (a connecting body, a second connecting body, and a second connecting body) are provided radially outward of the side gears 35a and 35b of the first main body 51 other than the shaft hole 56 of the first main body 51 and the periphery of the shaft hole 56. Connection body) 54 is formed. That is, the 2nd main-body part 52 has the some connection body 54 formed in the radial direction outward of each side gear 35a, 35b of each connection body 53, for example. Therefore, between the plurality of adjacent two coupling bodies 54, that is, the plurality of the shaft hole 56 of the first main body 51 and the radially outer sides of the side gears 35a and 35b around the shaft hole 56, respectively, A space 55 that can accommodate the pinion gear 34 is formed.

  Each of the plurality of coupling bodies 54 is, for example, from the inner periphery (the radially inner side of the side gears 35a and 35b) to the outer periphery (the radially outer side of the side gears 35a and 35b) in the central axis CL direction (the side gears 35a and 35b). In the axial direction) is increased. Further, in each of the plurality of coupling bodies 54, for example, an outer peripheral surface (radial outer peripheral surface of the side gears 35 a and 35 b) 54 a comes into contact with the inner surface of the ring member 21.

  Each pinion shaft 36 is accommodated in the space 55, for example. Each pinion shaft 36 rotatably supports, for example, the pinion gear 34 and the washer 44. Each pinion shaft 36 has, for example, one end portion (the other end portion) supported by the shaft hole 56 of the support member 37 and the other end portion (the one end portion) of the first cover member 18. It is supported by the shaft hole 27 of the flange portion 26.

  Next, the operation of this embodiment will be described. In the differential device 11 of the present embodiment, when the differential case 16 receives rotational force from the engine via the reduction gear mechanism 15, the pinion gear 34 does not rotate around the pinion shaft 36, and the central axis of the differential case 16 together with the differential case 16. (Rotation axis) When revolving around CL, the left and right side gears 35a and 35b are driven to rotate at the same speed from the differential case 16 via the pinion gear 34, and the driving force of the side gears 35a and 35b is evenly distributed to the left and right output shafts 13a. , 13b. Further, when a difference in rotational speed occurs between the left and right output shafts 13a and 13b due to turning of the automobile or the like, the pinion gear 34 revolves around the central axis (rotation axis) CL of the differential case 16 while rotating so that the pinion gear 34 A rotational driving force is transmitted to the left and right side gears 35a and 35b while allowing differential rotation. The above is the same as the operation of a conventionally known differential.

  By the way, in assembling the differential gear 11 of the present embodiment, for example, first, the first bearing member 25 of the first cover member 18 is on the lower side, and the flange portion 26 of the first cover member 18 is on the upper side. 1 Cover member 18 is placed. Next, washers for the side gears 35 a and 35 b are arranged at appropriate positions on the first cover body 24 of the first cover member 18. Next, the first side gear 35a is placed on the first cover body 24 of the first cover member 18 so that the teeth 47 of the first side gear 35a face upward (more specifically, the washers for the side gears 35a and 35b put on top. At this time, adjustment is made so that the washers for the side gears 35a and 35b are positioned on the back surface of the tooth portion 47 of the first side gear 35a.

  Next, the plurality of pinion gears 34 are respectively arranged at positions where they mesh with the tooth portions 47 of the first side gear 35a so that the shaft hole 38 of the pinion gear 34 and the shaft hole 27 of the flange portion 26 of the first cover member 18 are coaxial. To do. Next, each pinion gear 34 is accommodated in the space 55, and the shaft hole 56 of the first body portion 51 of the support member 37, the shaft hole 27 of the flange portion 26 of the first cover member 18, and the shaft hole 38 of the pinion gear 34. The support member 37 is disposed on the first side gear 25a so as to be coaxial. Next, each of the washers 44 is disposed between the receiving surface 28 of the flange portion 26 of the first cover member 18 and the back surface of the pinion gear 34 by an appropriate means.

  Then, the plurality of pinion shafts 36 are respectively inserted from the radially outer side of the first side gear 35 a through the shaft hole 27 of the flange portion 26, the washer 44 and the shaft hole 38 of the pinion gear 44 to the shaft hole 56 of the support member 37. At this time, each end of the pinion shaft 36 (the other end) is supported by the shaft hole 56 of the first main body 51 of the support member 37, and the other end (the one end) is the first. It arrange | positions so that it may be supported by the shaft hole 27 of the flange part 26 of the cover member 18. As shown in FIG.

  Next, the second side gear 35 b is disposed on the support member 37 so that the teeth 47 of the second side gear 35 b mesh with the plurality of pinion gears 34. Next, the washers for the side gears 35a and 35b are arranged so as to be positioned on the back surface of the tooth portion 47 of the second side gear 35b.

  Then, the second cover member 19 is connected to the distal end portion of the flange portion 26 of the first cover member 18 and the outer peripheral portion 54b of the connecting body 54 of the second main body portion of the support member 37 (more specifically, so as to cover the lid). The outer peripheral portion 54b of the connecting body 54 on the second side gear 35b side is brought into contact with the second side gear 35b side. Thereafter, the second cover member 19 and the support member 37, and the first cover member 18 and the support member 37 are coupled using a coupling means such as a bolt. Further, the coupling means is not limited to the bould, and other coupling means such as welding may be used.

  Thereafter, the ring member 21 is fitted into the combined body of the first cover member 18, the second cover member 19 and the support member 37. At this time, the radial outer peripheral ends of the side gears 35a and 35b of the first cover member 18, the radial outer peripheral ends of the side gears 35a and 35b of the second cover member 19, and the radial directions of the side gears 35a and 35b of the coupling body 54 of the support member 37 The outer peripheral end (that is, the outer peripheral surface 54 a of the coupling body 54) abuts on the ring member 21. Then, the ring member 21 is coupled to the first cover member 18 and the second cover member 19 by coupling means such as welding.

  Thereby, the ring member 21 can cover the outer ends (one end, the other end) on the flange portion 26 side of the first cover member 18 of each pinion shaft 36. In this way, each pinion shaft 36 is prevented from coming off. Further, since the gear teeth 22 of the ring member 21 are arranged on the outer periphery of the ring member 21, the size of the differential device 11 can be set in accordance with the dimension of the ring member 21 in the direction of the central axis CL. .

  According to the present embodiment, the differential device 11 can form a plurality of spaces 55 in which a plurality of pinion gears 34 can be individually accommodated, and one end portion (inner end portion and outer end portion) of the plurality of pinion shafts 36. Support member 37 that supports the inner end portion of the support member 37, the first cover member 18 that covers one side surface of the support member 37, and the other side surface of the support member 37 that faces the first cover member 18. A second cover member 19 that covers the first cover member 18, a plurality of pinion gears 34, and a plurality of pinion shafts 36, and a ring member 21 that can be coupled to the first cover member 18 and the second cover member 19. The first cover member 18 has a plurality of flange portions 26 that support the other end (the outer end of the inner end and the outer end) of the plurality of pinion shafts 36 on the outer peripheral portion. And has has a configuration of the ring member 21 covers all of the other outer end of the pinion shaft 36 (the end portion of the flange portion 26 side of the first cover member 18 of the pinion shaft 36). Therefore, the ring member 21 is disposed so as to pass on the rotation axis 33 coaxial with the pinion shaft 36. Therefore, unlike the prior art, the flange portion 26 of the first cover member 18 does not protrude from the gear teeth 22 of the ring member 21 in the axial direction of the central axis CL (the axial direction of the side gears 35a and 35b). This can contribute to the narrowing of the width.

  According to the present embodiment, in the differential device 11, the ring member 21 can cover the outer end of the pinion shaft 36. As a result, the pinion shaft 36 can be prevented from coming off by the ring member 21.

  Moreover, according to this embodiment, since the 1st main-body part 51 continues without a break around the central axis CL, the rigidity of the support member 37 can fully be ensured. Further, according to the present embodiment, the outer peripheral surface of the coupling body 54 of the second main body portion 52 of the support member 37 is in contact with the inner surface of the ring member 21. Therefore, the rigidity of the entire differential device 11 can be increased.

  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, although the differential device 11 according to the present embodiment includes the three pinion gears 34 arranged at equal intervals around the central axis CL, the present invention is not limited to this. In the present invention, two pinion gears 34 may be incorporated at equal intervals of a central angle of 180 degrees, four may be incorporated at intervals of a central angle of 90 degrees, and other five or more pinion gears 34 may be incorporated. Also good. In addition, for the assembly of the differential device 11, the present invention employs the assembly method shown in the above embodiment, but the present invention is not limited to this. In the present invention, the differential device 11 may be assembled by another assembling method different from the assembling method shown in the above embodiment.

DESCRIPTION OF SYMBOLS 11 ... Differential gear, 18 ... 1st cover member (one cover member, the other cover member), 19 ... 2nd cover member (the other cover member, one cover member), 21 ... Ring member (ring gear, driven) Member, driven gear, input member), 26 ... flange portion (support portion), 34 ... pinion gear (differential gear), 35a ... first side gear (side gear, output gear, first output gear), 35b ... second side gear (side gear) , Output gear, second output gear), 36 ... pinion shaft (shaft, differential gear support member), 37 ... support member, 55 ... space.

Claims (2)

A plurality of differential gears (34);
A plurality of differential gear support members (36) each supporting one said differential gear (34);
A plurality of spaces (55) capable of accommodating the plurality of differential gears (34), and a support member (37) for supporting one end of the plurality of differential gear support members (36); ,
A pair of output gears (35a, 35b) each meshing with the plurality of differential gears (34);
An input member (21) capable of accommodating therein the support member (37), the plurality of differential gears (34) and the plurality of differential gear support members (36);
One cover member (18) that covers one side surface of the support member (37) and can be coupled to the input member (21);
The other cover member (19) that covers the other side surface of the support member (37) facing the one cover member (18) and can be coupled to the input member (21);
With
The one cover member (18) has a plurality of support portions (26) for supporting the other ends of the plurality of differential gear support members (36) on an outer peripheral portion,
The input member (21) covers the other end of all the differential gear support members (36).
Differential device. The outer peripheral surface of the support member (37) is in contact with the inner surface of the input member (21).
The differential device according to claim 1.