TRANSMISSION DEVICE

Abstract

A transmission device capable of curbing deterioration of bearing lubricity is provided. One aspect of the present disclosure is a transmission device including a transmission mechanism and a gear case housing the transmission mechanism. The transmission mechanism includes an input gear, a counter gear, a ring gear, a first differential case bearing, and a second differential case bearing. The gear case includes a receiver, a guide that guides the oil moved up by the ring gear to the receiver, and a buffer portion that guides some of the oil flowing through the guide to the second differential case bearing.The ring gear is a twisted helical gear configured to guide the oil along an axial direction of the ring gear to the first differential case bearing when the ring gear rotates in a direction in which the oil is moved up toward the guide.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a transmission device. BACKGROUND STATE OF THE ART

[0002] In a transmission device having a differential mechanism, a structure is known in which oil for bearing lubrication scraped by a ring gear attached to a differential case is supplied to a bearing of each gear via a catch tank (which is a reservoir) (see Patent Document 1).

[0003] In this configuration, the oil scraped off by the ring gear is also fed to the two bearings that support the differential housing on both axial sides. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0004] Patent Document 1: Unexamined Japanese Patent Application Publication No. 2012-189176 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] In the transmission device described above, when the ring gear is a helical gear, the oil is guided along the axial direction by the torsion of the teeth. Therefore, lubrication of one of the two bearings supporting the differential case may be insufficient. In addition, the supply amount to the catch tank also decreases, and lubrication of bearings of other gears may be insufficient.

[0006] An aspect of the present disclosure preferably provides a transmission device capable of preventing a reduction in lubricity of a bearing. MEANS TO SOLVE THE PROBLEMS

[0007] One aspect of the present disclosure is a transmission device comprising a gear mechanism and a gear housing accommodating the gear mechanism.A transmission mechanism includes an input gear, a counter gear having a rotational axis parallel to a rotational axis of the input gear, a ring gear having a rotational axis parallel to the rotational axis of the input gear, a differential case fixed to the ring gear, a differential mechanism disposed within the differential case, an input gear bearing rotatably supporting the input gear, a counter gear bearing rotatably supporting the counter gear, a first differential case bearing rotatably supporting the differential case, and a second differential case bearing rotatably supporting the differential case and disposed opposite to the first differential case bearing with respect to the ring gear in an axial direction of the ring gear.

[0008] The mating gear includes a first gear that meshes with the input gear, and a second gear that has a smaller outer diameter than the first gear, is arranged concentrically with the first gear, and meshes with the ring gear. The gear case includes a receiver, a guide that guides the oil scraped by the ring gear to the receiver, and a buffer portion that guides a portion of the oil flowing through the guide to the second differential case bearing. The ring gear is a helical gear that is twisted such that the oil is guided along the axial direction of the ring gear to the first differential case bearing when the ring gear rotates in a direction in which the oil is scraped toward the guide.

[0009] The guide has a guide surface along which oil flows toward the catch tank. The guide surface has a groove that is recessed downward and extends along the axial direction of the ring gear. The buffer portion has a bottom wall that is coupled to the groove in the axial direction of the ring gear, and a side wall that surrounds the bottom wall. The side wall has an outflow portion through which the oil flows toward the second differential case bearing.

[0010] According to such a configuration, a portion of the oil supplied to the catch tank flows along the axial direction of the ring gear through the groove of the guide surface to the buffer portion. The oil flowing to the buffer portion is supplied to the second differential case bearing through the outflow portion. Therefore, the amount of oil supplied to the second differential case bearing can be secured while the oil is supplied to the first differential case bearing and the catch tank. As a result, it is possible to prevent a reduction in the lubricity of the plurality of bearings included in the transmission mechanism.

[0011] In one aspect of the present disclosure, the height of the top point of the outflow portion may be equal to or lower than the height of the top point of the groove. According to such a configuration, when the amount of oil scraped by the ring gear is small (for example, during low-speed rotation), the amount of oil supplied to the second differential case bearing can be increased.

[0012] In one aspect of the present disclosure, the gear housing may include a guide portion arranged to be offset from the guide in the axial direction of the ring gear, and which guides the oil to the guide. The guide portion may be a recess provided in the inner surface of the gear housing to form a flow path of oil continuous with the groove. According to such a configuration, since the oil is supplied from the guide portion to the buffer portion via the groove, the amount of oil supplied to the second differential case bearing increases.

[0013] In one aspect of the present disclosure, both the guide and the buffer portion may be ribs that protrude from the inner surface of the gear housing in the axial direction of the input gear. According to such a configuration, the manufacturing costs of the guide and the buffer portion can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic right side view of a transmission device according to an embodiment in a state in which a second housing and a part of a bearing are removed. Fig. Figure 2 is a schematic cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a schematic cross-sectional view along the line III-III in Fig. 1. Fig. 4 is a schematic left side view of the transmission device of Fig. 1 in a state in which a first housing and a part of a bearing are removed. Fig. 5 is a schematic right side view of the first housing of Fig. 1. Fig. 6 is a schematic left side view of the second housing of Fig. 4. Fig. Figure 7 is a schematic cross-sectional view taken along line VII-VII in Fig. 1. Fig. Figure 8 is a schematic cross-sectional view taken along the line VIII-VIII in Fig. 1. Fig. 9 is a schematic cross-sectional view along the line IX-IX in Fig. 1. Fig. 10 is a schematic cross-sectional view taken along the line XX in Fig. 4. Fig. 11 is a schematic left side view of the second housing of Fig. 4. Fig. 12 is a schematic right side view of the first housing of Fig. 1. EXPLANATION OF REFERENCE NUMBERS

[0014] 1... transmission device, 2... transmission mechanism, 3... gear housing, 3A... first housing, 3B... second housing, 21... input gear, 22... counter gear, 23... ring gear, 24... differential case, 31... catch tank, 32... main guide, 33... guide section, 34... hanging wall, 35... buffer section, 36... lower guide, 37... reverse guide, 221... first gear, 222... second gear, 311... bottom wall, 311A, 311B... connecting hole, 312... side wall, 312A... discharge section, 321... upstream end, 322... downstream end, 323... guide surface, 323A... groove, 331... first end, 332... second end, 351... bottom wall, 352... side wall, 352A... outflow section, 371... upstream end, 372... downstream end, 373... guide surface MODE FOR CARRYING OUT THE INVENTION

[0015] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First Embodiment][1-1. Configuration]

[0016] One in Fig. The transmission device 1 shown in Fig. 1 is a device which is installed in a vehicle and transmits power from a drive source of the vehicle to wheels.

[0017] The transmission device 1 includes a transmission mechanism 2, a gear housing 3, and a parking lock mechanism 5. The transmission device 1 is installed in a vehicle in a position in which a direction parallel to a rotation axis L1 of an input gear 21 of the transmission mechanism 2 is a left-right direction, and a direction in which the input gear 21 is arranged with respect to a ring gear 23 is a forward direction. <getriebemechanismus>

[0018] The transmission mechanism 2 includes the input gear 21, a counter gear 22, the ring gear 23, a differential case 24 and a differential mechanism 25.

[0019] Furthermore, as in Fig. 2, the transmission mechanism 2 includes a first input gear bearing 27A, a second input gear bearing 27B, a first counter gear bearing 28A, a second counter gear bearing 28B, a first differential case bearing 29A, and a second differential case bearing 29B. <eingangszahnrad>

[0020] The input gear 21 is an external gear which is drivingly coupled to a motor (not shown) and rotates axially by a driving force of the motor.

[0021] The input gear 21 rotates in Fig. 1 counterclockwise when the vehicle is moving forward and turns in Fig. 1 clockwise when the vehicle is moving backward. The rotation axis L1 of the input gear 21 is parallel to the left-right direction.

[0022] The input gear 21 is a right-hand helical gear. As shown in Fig. 2, an axial force F1 in the left direction is generated in the input gear 21 when the vehicle is driven in the forward direction. <gegenrad>

[0023] The counter gear 22 has a rotation axis L2 which is parallel to the rotation axis L1 of the input gear 21.

[0024] The rotational axis L2 of the counter gear 22 is located behind the rotational axis L1 of the input gear 21 and above the rotational axis L1 of the input gear 21 and the rotational axis L3 of the ring gear 23 (see Fig. 1). The counter gear 22 comprises a first gear 221 and a second gear 222.

[0025] The first gear 221 is an external gear that meshes with the input gear 21. The first gear 221 is a left-hand helical gear. A right-hand axial force F2 is generated in the first gear 221 when the vehicle is driven in the forward direction.

[0026] When the first gear 221 rotates in the reverse direction of the vehicle due to the rotation of the first gear 221, the oil scraped by the first gear 221 is guided to the left.

[0027] That is, the first gear 221 is rotated such that the oil is guided toward the inner surface of a second housing 3B and a reverse guide 37 provided on the inner surface when the first gear 221 rotates in the reverse direction of the vehicle.

[0028] The second gear 222 is an external gear that meshes with the ring gear 23. The second gear 222 has an outer diameter smaller than that of the first gear 221 and is arranged concentrically with the first gear 221. The second gear 222 is arranged to the right of the first gear 221.

[0029] The second gear 222 is a left-hand helical gear. The second gear 222 rotates integrally with the first gear 221. An axial force F3 in the left direction is generated in the second gear 222 when the vehicle is driven in the forward direction. The second gear 222 has a stepped portion 222A that contacts the first gear 221 in the axial direction. The axial force F2 of the first gear 221 is absorbed by the stepped portion 222A of the second gear 222. Since the axial force F2 of the first gear 221 and the axial force F3 of the second gear 222 cancel each other out, the axial forces exerted on the first counter-gear bearing 28A and the second counter-gear bearing 28B are reduced. <hohlrad>

[0030] The ring gear 23 is an external gear having a rotational axis L3 parallel to the rotational axis L1 of the input gear 21. The rotational axis L3 of the ring gear 23 is positioned behind the rotational axis L2 of the counter gear 22.

[0031] The ring gear 23 rotates the differential case 24 by the rotational force transmitted from the counter gear 22 and scrapes the lubricating oil accumulated at the bottom of the gear case 3 toward a main guide 32.

[0032] The ring gear 23 is a right-hand helical gear. A right-hand axial force F4 is generated in the ring gear 23 when the vehicle is driven in the forward direction. The axial force F4 is absorbed by a flange portion 242 of the differential case 24.

[0033] Furthermore, due to the torsion of the ring gear 23, when the ring gear 23 rotates in the forward direction of the vehicle, the oil scraped by the ring gear 23 is guided to the right.

[0034] That is, the ring gear 23 is twisted such that the oil is guided toward the inner surface of a first housing 3A and a guide portion 33 provided on the inner surface when the ring gear 23 rotates in the direction in which the oil is scraped toward the main guide 32 (ie, in the forward direction of the vehicle).

[0035] In other words, the ring gear 23 is rotated such that the oil is guided along the axial direction of the ring gear 23 to the first differential case bearing 29A when the ring gear 23 rotates in the direction in which the oil is scraped toward the main guide 32. <Differentialgehäuse>

[0036] The differential case 24 is fixed to the ring gear 23 and rotates together with the ring gear 23 about the rotation axis L3 of the ring gear 23. As shown in Fig. 3, the differential case 24 includes a differential mechanism receiving portion 241, the flange portion 242, a first shaft portion 243, a second shaft portion 244, and a window 245.

[0037] The differential mechanism receiving portion 241 receives the differential mechanism 25. The flange portion 242 protrudes radially outward from the differential mechanism receiving portion 241. The ring gear 23 is fixed to the flange portion 242.

[0038] The first shaft portion 243 is a cylindrical portion through which a first output shaft (not shown) is inserted, which is coupled to the differential mechanism 25. The second shaft portion 244 is a cylindrical portion through which a second output shaft (not shown) is inserted, which is coupled to the differential mechanism 25. The window 245 is an opening that communicates between the interior of the differential mechanism receiving portion 241 and the exterior of the differential mechanism receiving portion 241. <differentialmechanismus>

[0039] The differential mechanism 25 is a known mechanism that distributes and transmits the rotation of the differential case 24 to the first output shaft and the second output shaft while rotating the first output shaft and the second output shaft differently. The differential mechanism 25 is arranged within the differential mechanism receiving portion 241.

[0040] The differential mechanism 25 includes two side gears coupled to the first output shaft and the second output shaft, and two pinions that transmit the rotation of the differential case 24 to the two side gears.

[0041] The rotational axes of the first output shaft and the second output shaft coincide with the rotational axis of the ring gear 23. The first output shaft and the second output shaft rotate in unison with the rotational direction of the input gear 21 (i.e., the rotational direction of the differential case 24) while rotating differently. <eingangszahnradlager>

[0042] The first input gear bearing 27A and the second input gear bearing 27B, which are in Fig. 2 are ball bearings which rotatably support the input gear 21.

[0043] The second input gear bearing 27B is arranged opposite to the first input gear bearing 27A with respect to the teeth of the input gear 21 in the axial direction of the input gear 21. Specifically, the first input gear bearing 27A supports the right end of the shaft of the input gear 21, and the second input gear bearing 27B supports the left end of the shaft of the input gear 21.

[0044] The first input gear bearing 27A is mounted on the first housing 3A. The second input gear bearing 27B is mounted on the second housing 3B. <gegenradlager>

[0045] The first counter-wheel bearing 28A and the second counter-wheel bearing 28B are ball bearings which rotatably support the counter-wheel 22.

[0046] The second counter gear bearing 28B is arranged opposite to the first counter gear bearing 28A in the axial direction of the counter gear 22 with respect to the first gear 221 and the second gear 222. Specifically, the first counter gear bearing 28A supports the right end of the shaft portion of the counter gear 22, and the second counter gear bearing 28B supports the left end of the shaft portion of the counter gear 22.

[0047] The first counter gear bearing 28A is attached to the first housing 3A. The second counter gear bearing 28B is attached to the second housing 3B. <Differentialgehäuselager>

[0048] The first differential case bearing 29A and the second differential case bearing 29B are tapered roller bearings which rotatably support the differential case 24.

[0049] The second differential case bearing 29B is arranged opposite to the first differential case bearing 29A in the axial direction of the ring gear 23 with respect to the ring gear 23. Specifically, the first differential case bearing 29A supports the first shaft portion 243 of the differential case 24, and the second differential case bearing 29B supports the second shaft portion 244 of the differential case 24.

[0050] The first differential case bearing 29A is attached to the first case 3A. The second differential case bearing 29B is attached to the second case 3B. <Zahnradgehäuse>

[0051] The gear housing 3 houses the transmission mechanism 2. The gear housing 3 includes a first housing 3A and a second housing 3B, which sandwich the transmission mechanism 2 in the axial direction (ie, in the left-right direction) of the input gear 21.

[0052] The first housing 3A and the second housing 3B are coupled together by a plurality of bolts to form a receiving space for accommodating the transmission mechanism 2, the parking lock mechanism 5, and the oil. Fig. 2, an illustration of a portion of the first housing 3A in which a motor (not shown) as a drive source is housed is omitted.

[0053] As in Fig. 1, in the connecting surface with the second housing 3B in the outer frame of the first housing 3A, a first upper center portion 3C and a first lower center portion 3D have widths (i.e., thicknesses in the vertical direction) larger than those of other portions. The first upper center portion 3C is a portion overlapping a part of the input gear 21, the entire counter gear 22, and a part of the ring gear 23 from above. The first lower center portion 3D is a portion overlapping a part of the input gear 21, the entire counter gear 22, and a part of the ring gear 23 from below.

[0054] As in Fig. 4, in the connecting surface with the first housing 3A in the outer frame of the second housing 3B, a second upper middle portion 3E and a second lower middle portion 3F, which are connected to the first upper middle portion 3C and the first lower middle portion 3D of the first housing 3A, respectively, have widths larger than those of other portions such as the first upper middle portion 3C and the first lower middle portion 3D.

[0055] By increasing the width of the joint surface in the central portion of the gear housing 3 in this way, it is possible to prevent oil from leaking to the outside of the gear housing 3 when the gear housing 3 is deformed by a load, while preventing the gear housing 3 from increasing in size.

[0056] As in the Fig. 5 and Fig. 6, the gear case 3 includes a receiver 31, a main guide 32, a guide portion 33, a hanging wall 34, a buffer portion 35, a lower guide 36, a reverse guide 37, a reverse hanging wall 38, a first input gear bearing receiving portion 41A, a second input gear bearing receiving portion 41B, a first counter gear bearing receiving portion 42A, a second counter gear bearing receiving portion 42B, a first differential case bearing receiving portion 43A, a second differential case bearing receiving portion 43B, a right first counter gear flow path 45A, a left first counter gear flow path 45B, a second counter gear flow path 46, and a differential case flow path 47. <Auffangbehälter>

[0057] The catch tank 31 is a portion that stores the oil scraped by the ring gear 23. The catch tank 31 includes a rib projecting from the inner surface of the first housing 3A toward the second housing 3B (i.e., to the left) and a rib projecting from the inner surface of the second housing 3B toward the first housing 3A (i.e., to the right).

[0058] As in Fig. 1, the collecting container 31 is arranged in front of the counter gear 22 and at a higher position than the input gear 21. As shown in Fig. As shown in Figure 7, the collecting container 31 is arranged at a position overlapping the input gear 21 from above. The collecting container 31 has a bottom wall 311 and a side wall 312.

[0059] The bottom wall 311 is arranged above the first housing 3A and the second housing 3B. The bottom wall 311 has a first communication hole 311A and a second communication hole 311B. The first communication hole 311A allows the interior of the catch tank 31 to communicate with the first input gear bearing receiving portion 41A. The first communication hole 311A guides the oil in the catch tank 31 to the first input gear bearing 27A by gravity.

[0060] The second communication hole 311B is provided to the left of the first communication hole 311A and connects the inside of the catch tank 31 to the second input gear bearing receiving portion 41B. The second communication hole 311B guides the oil in the catch tank 31 to the second input gear 27B by gravity.

[0061] The side wall 312 surrounds the bottom wall 311 on four sides. The side wall 312 has an outflow portion 312A and a third communication hole 312B. The outflow portion 312A is a portion having a lower height than other portions in the side wall 312. The outflow portion 312A is a portion having the lowest height in the side wall 312 and is provided in a right portion of a rear wall of the side wall 312.

[0062] The outflow portion 312A is formed by a part of the rib of the first housing 3A and is provided at a position overlapping the main guide 32 from below. When the liquid level of the oil stored in the receiver tank 31 exceeds the height of the outflow portion 312A, the oil flows from the outflow portion 312A to the exterior of the receiver tank 31 (specifically, to the first right counter-wheel flow path 45A). A flow direction of the oil in the outflow portion 312A is reverse.

[0063] The third communication hole 312B is provided in a left portion of the rear wall of the side wall 312. The third communication hole 312B guides the oil in the catch tank 31 to the left first counter-wheel flow path 45B (see Fig. 6). <Hauptführung>

[0064] The main guide 32 guides the oil scraped by the ring gear 23 to the catch tank 31 when the ring gear 23 rotates in the forward direction of the vehicle (hereinafter, this direction is also referred to as a "first direction"). The main guide 32 is formed by a rib protruding from the inner surface of the first housing 3A in the axial direction of the input gear 21.

[0065] As in Fig. As shown in Figure 8, at least a portion of the main guide 32 overlaps the first gear 221 in the axial direction of the counter gear 22. Specifically, the central portion of the main guide 32 is located to the right of the first gear 221 in the oil flow direction.

[0066] At least a part of the main guide 32 overlaps the second gear 222 in the radial direction of the counter gear 22. Specifically, the central portion of the main guide 32 overlaps the second gear 222 from above in the oil flow direction.

[0067] Furthermore, the main guide 32 is arranged at a higher position than the first counter gear bearing 28A, viewed in the axial direction of the counter gear 22. That is, the main guide 32 extends beyond the first counter gear bearing 28A in the front-rear direction.

[0068] As in Fig. As shown in Figure 5, the main guide 32 has an upstream end 321, a downstream end 322, and a guide surface 323. The upstream end 321 and the downstream end 322 are each ends in the oil flow direction. The upstream end 321 is located at a position that is rearward of the downstream end 322 and higher than the downstream end 322. Therefore, the main guide 32 forms a flow path through which the oil flows from the rear upper side to the front lower side.

[0069] As in Fig. 1, the upstream end 321 is located radially outward of the ring gear 23. The upstream end 321 is arranged at a position higher than the ring gear 23 and lower than a higher point among a top point P1 of the ring gear 23 and a top point P2 of the first gear 221. Further, the upstream end 321 is arranged at a position parallel to the axial direction of the ring gear 23 and lower than a virtual plane S including the top point P1 of the ring gear 23 and the top point P2 of the first gear 221.

[0070] The downstream end 322 is located above the collecting container 31. The downstream end 322 is located in front of the outlet section 312A of the collecting container 31.

[0071] The guide surface 323 is a surface on which oil flows toward the collecting container 31. The guide surface 323 forms an upper surface of the main guide 32. As shown in Fig. As shown in Figure 8, the guide surface 323 is inclined relative to the axial direction of the mating gear 22 such that its position is lowered to the left. This inclination is caused by the angle at which the first housing 3A is removed from the mold.

[0072] As in Fig. 9, the guide surface 323 has a groove 323A and a step 323B. The groove 323A is recessed downward and extends along the axial direction of the ring gear 23. Specifically, the groove 323A extends from the inner surface of the first housing 3A to the buffer portion 35. The groove 323A is disposed between the upstream end 321 of the main guide 32 and the step 323B.

[0073] The step 323B is provided downstream of the groove 323A. The oil overflowing from the groove 323A falls along the step 323B and flows toward the downstream end 322. A part of the oil that has reached the upstream end 321 flows to the left (ie, toward the buffer portion 35) as indicated by an arrow in Fig. 9, and the remainder passes over the groove 323A and flows towards the downstream end 322. <Führungsabschnitt>

[0074] The guide portion 33 is arranged to be offset from the main guide 32 in the axial direction (ie, the left-right direction) of the ring gear 23 and to guide oil to the main guide 32.

[0075] The guide portion 33 is a recess provided in the inner surface of the first housing 3A. The guide portion 33 is provided to the right of the main guide 32 and is recessed to the right. The guide portion 33 extends in the front-rear direction and guides the oil forward. The guide portion 33 forms an oil flow path continuous with the groove 323A of the main guide 32.

[0076] As in Fig. 5, the guide portion 33 extends from a first end 331 to a second end 332. The first end 331 is a front end of the guide portion 33. The first end 331 is coupled from above to the upstream end 321 of the main guide 32.

[0077] The second end 332 is a rear end of the guide portion 33. The second end 332 is arranged at a position that overlaps the ring gear 23 when viewed in the axial direction of the ring gear 23. In particular, the second end 332 overlaps a portion A1 (see Fig. 1) before reaching the top point P1 of the ring gear 23, or the top point P1 of the ring gear 23 when the ring gear 23 rotates in the first direction. The section A1 is a region of the outer peripheral surface of the ring gear 23 in which the rotation angle θ from the top point P1 is 10° or less. <Hängewand>

[0078] As in Fig. 3, the hanging wall 34 extends downward from the second end 332 of the guide portion 33 toward the window 245 of the differential case 24. The hanging wall 34 is formed by a rib projecting from the inner surface of the first case 3A.

[0079] As in Fig. As shown in Figure 5, the hanging wall 34 has a first surface 341 and a second surface 342 extending in the vertical direction. The first surface 341 faces rearward, and the second surface 342 faces forward. The oil that has reached a position lower than the second end 332 of the guide portion 33 is guided through the first surface 341 to the window 245. <pufferabschnitt>

[0080] The Fig. The buffer portion 35 shown in Fig. 9 guides a portion of the oil flowing through the main guide 32 to the second differential case bearing 29B. The buffer portion 35 is formed by a rib projecting from the inner surface of the second case 3B in the axial direction of the input gear 21.

[0081] The buffer portion 35 has a bottom wall 351 and a side wall 352. The bottom wall 351 is coupled to the groove 323A of the main guide 32 in the axial direction of the ring gear 23. That is, the buffer portion 35 is supplied with oil from the groove 323A.

[0082] The side wall 352 surrounds the bottom wall 351 from the front, rear, and left sides. The side wall 352 has an outflow section 352A. The outflow section 352A is a section that has a lower height than other sections in the side wall 352. The outflow section 352A is a section that has the lowest height in the side wall 352 and is provided on a rear wall of the side wall 352.

[0083] The outflow portion 352A is provided to the left of the upstream end 321 of the main guide 32 and causes the oil in the buffer portion 35 to flow toward the second differential case bearing 29B. The height of the uppermost point of the outflow portion 352A is equal to or lower than the height of the uppermost point of the groove 323A of the main guide 32.

[0084] When the liquid level of the oil stored in the buffer portion 35 exceeds the height of the outflow portion 352A, the oil flows from the outflow portion 352A to the outside of the buffer portion 35. The outflow direction of the oil in the outflow portion 352A is reverse. That is, the flow direction of the oil from the buffer portion 35 is opposite to the flow direction of the oil in the main passage 32. <Untere Führung>

[0085] The Fig. 4 faces the ring gear 23 from the radially outer side at a position lower than the rotation axis L3 of the ring gear 23, and faces the first gear 221 from the radially outer side at a position lower than the rotation axis L2 of the first gear 221.

[0086] The lower guide 36 comprises a rib (see Fig. 1) which projects from the inner surface of the first housing 3A toward the second housing 3B (ie, to the left), and a rib which projects from the inner surface of the second housing 3B toward the first housing 3A (ie, to the right).

[0087] Specifically, the lower guide 36 includes a rear portion 361 extending along the outer edge of the ring gear 23 and a front portion 362 extending forward from the front end of a rear portion 361. The rear portion 361 faces the front lower portion of the ring gear 23. The front portion 362 faces the lower portion of the first gear 221. The front portion 362 extends to the first input gear bearing receiving portion 41A and the second input gear bearing receiving portion 41B.

[0088] The oil scraped when the ring gear 23 rotates in the reverse direction (hereinafter, the direction is also referred to as a "second direction") of the vehicle is guided to the front portion 362. The oil guided to the front portion 362 is further scraped by the first gear 221.

[0089] As in the Fig. 5 and Fig. As shown in Fig. 6, the lower guide 36 divides the interior of the gear housing 3 (i.e., the oil storage space) into a front portion 3G and a rear portion 3H. The lower end (i.e., the rear end) of the lower guide 36 is spaced apart from the lower surface of the interior of the gear housing 3. The gap between the lower end of the lower guide 36 and the lower surface of the interior of the gear housing 3 forms a flow channel for oil from the front portion 3G to the rear portion 3H.

[0090] Since the oil storage space is divided by the lower guide 36 in this way, the amount of oil in which the ring gear 23 is immersed during running of the vehicle is reduced, so that the stirring resistance of the ring gear 23 is reduced. <Rückwärtsführung>

[0091] When the ring gear 23 rotates in the second direction, the Fig. 6, the reverse guide 37 guides the oil scraped by the first gear 221 into the lower guide 36 after the ring gear 23 has scraped down to the catch tank 31. The reverse guide 37 is formed by a rib protruding from the inner surface of the second housing 3B in the axial direction of the input gear 21.

[0092] As in Fig. As shown in Figure 10, the reverse guide 37 is arranged at a position overlapping the first gear 221 in the axial direction of the counter gear 22. Specifically, the upstream portion of the reverse guide 37 is arranged to the left of the first gear 221 in the oil flow direction.

[0093] The reverse guide 37 has an upstream end 371, a downstream end 372, and a guide surface 373. The upstream end 371 and the downstream end 372 are each ends in the oil flow direction. As shown in Fig. As shown in Figure 6, the upstream end 371 is located at a position rearward of the downstream end 372 and higher than the downstream end 372. Therefore, the reverse guide 37 forms a flow path through which oil flows from the rear upper side to the front lower side. The upstream end 371 is located at a position higher than the second counter gear bearing receiving portion 42B and forward of the rotation axis L2 of the counter gear 22.

[0094] The downstream end 372 is arranged above the collecting container 31. The downstream end 372 is coupled to a rear wall of the side wall 312 of the collecting container 31.

[0095] The guide surface 373 is a surface on which oil flows toward the collecting container 31. The guide surface 373 forms an upper surface of the reverse guide 37. As shown in Fig. 10, the guide surface 373 has a width orthogonal to the oil flow direction (ie, a width in the left-right direction), which increases toward the collecting tank 31. <Rückwärtshängewand>

[0096] The Fig. 6 supplies the second differential case 29B with oil scraped by the ring gear 23 when the ring gear 23 rotates in the second direction.

[0097] The rear hanging wall 38 is formed by a portion (specifically, a rear wall) of a recess provided in the inner surface of the second housing 3B. The rear hanging wall 38 has a wall surface facing forward. The rear hanging wall 38 is arranged behind the buffer portion 35 and above the second differential case bearing receiving portion 43B. <lageraufnahmeabschnitt>

[0098] The first input gear bearing receiving portion 41A, the first counter gear bearing receiving portion 42A and the first differential case bearing receiving portion 43A, which in Fig. 5, accommodate the first input gear bearing 27A, the first counter gear bearing 28A and the first differential case bearing 29A, respectively.

[0099] The first input gear bearing receiving portion 41A, the first counter gear bearing receiving portion 42A, and the first differential case bearing receiving portion 43A are recesses provided in the inner surface of the first housing 3A. The first input gear bearing receiving portion 41A has an opening through which the motor shaft is inserted. The first differential case bearing receiving portion 43A has an opening through which the first output shaft is inserted. An oil seal is disposed in these openings.

[0100] The second input gear bearing receiving portion 41B, the second counter gear bearing receiving portion 42B and the second differential case bearing receiving portion 43B, which in Fig. 6, accommodate the second input gear bearing 27B, the second counter gear bearing 28B and the second differential case bearing 29B, respectively.

[0101] The second input gear bearing receiving portion 41B, the second counter gear bearing receiving portion 42B, and the second differential case bearing receiving portion 43B are recesses provided in the inner surface of the second housing 3B. The second differential case bearing receiving portion 43B has an opening through which the second output shaft is inserted. An oil seal is disposed in the opening. <Erster Gegenradströmungsweg>

[0102] The Fig. The right first counter gear flow path 45A shown in Fig. 5 guides oil flowing from the outflow portion 312A of the catch tank 31 to the first counter gear bearing 28A. The right first counter gear flow path 45A allows the oil to flow backward toward the first counter gear bearing 28A.

[0103] The right first counter-gear flow path 45A is formed by a recess and a rib provided in the inner surface of the first housing 3A. The right first counter-gear flow path 45A extends from the outflow portion 312A of the catch tank 31 to the first counter-gear bearing receiving portion 42A.

[0104] The Fig. The left first counter gear flow path 45B shown in Fig. 6 conducts oil from the catch tank 31 to the second counter gear bearing 28B. The left first counter gear flow path 45B allows the oil to flow backward toward the second counter gear bearing 28B.

[0105] The left first counter-gear flow path 45B is a communication hole provided in the second housing 3B. The left first counter-gear flow path 45B is a communication hole that allows the third communication hole 312B of the collecting container 31 and the second counter-gear bearing receiving portion 42B to communicate with each other. <Zweiter Gegenradströmungsweg>

[0106] The Fig. The second counter gear flow path 46 shown in FIG. 5 directs the oil scraped by the ring gear 23 directly to the first counter gear bearing 28A. The second counter gear flow path 46 causes oil to flow forward to the first counter gear bearing 28A. The second counter gear flow path 46 is formed by a rib protruding from the inner surface of the first housing 3A.

[0107] The second counter gear flow path 46 is arranged at a position lower than the upstream end 321 of the main guide 32. Specifically, the entire second counter gear flow path 46 is arranged below the main guide 32. At least a portion of the second counter gear flow path 46 overlaps the ring gear 23 when viewed in the axial direction of the ring gear 23. The second counter gear flow path 46 extends from a region below the upstream end 321 of the main guide 32 and in front of the upstream end 321 of the main guide 32 to the first counter gear bearing receiving portion 42A. <Differentialgehäuseströmungsweg>

[0108] The differential case flow path 47 conducts oil from the first counter gear bearing 28A to the first differential case bearing 29A. The differential case flow path 47 is a communication hole provided in the first case 3A.

[0109] The differential case flow path 47 is arranged below the second counter gear flow path 46. The differential case flow path 47 allows the first counter gear bearing receiving portion 42A and the first differential case bearing receiving portion 43A to communicate with each other. <parksperrmechanismus>

[0110] The Fig. The parking lock mechanism 5 shown in Fig. 1 can be shifted between a locked state in which the rotation of the input gear 21 is restricted and a released state in which rotation is permitted. <Oil behavior>

[0111] Like an arrow in Fig. 5, when the vehicle moves forward (ie, when the ring gear 23 rotates in the first direction D1), the oil O stored in the rear portion 3H of the gear case 3 is scraped by the ring gear 23 toward the main guide 32.

[0112] The oil O scraped by the ring gear 23 reaches the main guide 32 and is guided through the main guide 32 to the catch tank 31. Furthermore, a part of the oil O is guided to the guide section 33 by the torsion of the ring gear 23. The oil O guided to the guide section 33 is guided to the main guide 32. The oil O guided to the hanging wall 34 is guided through the hanging wall 34 and supplied to the window 245 of the differential case 24.

[0113] The oil O supplied to the catch tank 31 is supplied to the oil seals of the first input gear bearing 27A and the first input gear bearing receiving portion 41A from the first communication hole 311A provided in the bottom wall 311. The oil O overflowing from the outflow portion 312A of the catch tank 31 is supplied to the first counter gear bearing 28A from the right first counter gear flow path 45A.

[0114] A portion of the oil scraped by the ring gear 23 is supplied to the first counter gear bearing 28A through the second counter gear flow path 46 without passing through the catch tank 31. When the rotational speed of the ring gear 23 is low, the amount of oil O scraped by the ring gear 23 reaching the main guide 32 decreases, and the amount of oil O reaching the second counter gear flow path 46 increases.

[0115] The oil supplied to the first counter gear bearing 28A is supplied through the differential case flow path 47 to the first differential case bearing 29A, the oil seal of the first differential case bearing receiving portion 43A, and the sliding portion between the first shaft portion 24B and the first output shaft. The oil O supplied to the first differential case bearing 29A is returned to the rear portion 3H of the gear case 3.

[0116] Like an arrow in Fig. 6, at the time of forward movement of the vehicle in the second housing 3B, the oil O supplied to the catch tank 31 is supplied to the second input gear bearing 27B from the second communication hole 311B provided in the bottom wall 311. The oil O in the catch tank 31 is supplied to the second counter gear bearing 28B from the third communication hole 312B via the left first counter gear flow path 45B.

[0117] A portion of the oil O scraped by the ring gear 23 through the main guide 32 is supplied to the buffer portion 35 through the groove 323A of the main guide 32. The oil O overflowing from the outflow portion 352A of the buffer portion 35 is supplied to the second differential case bearing 29B, the oil seal of the second differential case bearing receiving portion 43B, and the sliding portion between the second shaft portion 244 and the second output shaft. When the vehicle is moving forward, the oil does not flow through the reverse guide 37.

[0118] Like an arrow in Fig. As shown in Fig. 11, when the vehicle moves backward (i.e., when the ring gear 23 rotates in the second direction D2), the oil O accumulated in the rear portion 3H of the gear housing 3 is scraped forward by the ring gear 23 along the lower guide 36. The oil O scraped by the ring gear 23 on the lower guide 36 is scraped by the first gear 221 toward the reverse guide 37.

[0119] The oil O scraped by the first gear 221 reaches the reverse guide 37 and is guided to the catch tank 31 through the reverse guide 37. A part of the oil O scraped by the first gear 221 is scattered and reaches the reverse hanging wall 38, and is supplied to the second differential case bearing 29B, the oil seal of the second differential case bearing receiving portion 43B, and the sliding portion between the second shaft portion 244 and the second output shaft along the wall surface of the reverse hanging wall 38.

[0120] Like an arrow in Fig. 12, in the first housing 3A, a part of the oil O scraped by the ring gear 23 is scattered and reaches the second surface 342 of the hanging wall 34 and is supplied to the window 245 of the differential case 24.

[0121] The oil O directed to the catch tank 31 during reverse movement is supplied to each bearing and the oil seal via a flow path similar to that during forward movement. When the vehicle is moving backward, the oil does not flow through the main guide 32. [1-2. Effects]

[0122] According to the embodiment described in detail above, the following effects can be achieved.

[0123] (1a) A portion of the oil supplied to the catch tank 31 flows along the axial direction of the ring gear 23 through the groove 323A of the guide surface 323 to the buffer portion 35. The oil supplied to the buffer portion 35 is supplied to the second differential case bearing 29B through the outflow portion 312A. Therefore, it is possible to secure the amount of oil supplied to the second differential case bearing 29B while supplying the oil to the first differential case bearing 29A and the catch tank 31. As a result, it is possible to prevent a reduction in lubricity of the plurality of bearings included in the transmission mechanism 2.

[0124] (1b) Since the height of the top point of the outflow portion 312A is equal to or lower than the height of the top point of the groove 323A, the amount of oil supplied to the second differential case bearing 29B can be increased when the amount of oil scraped by the ring gear 23 is small (for example, at the time of low-speed rotation).

[0125] (1c) Since the oil is supplied to the buffer portion 35 from the guide portion 33 via the groove 323A formed by a recess provided in the inner surface of the gear case 3, the amount of oil supplied to the second differential case bearing 29B increases.

[0126] (1d) Since the main guide 32 and the buffer portion 35 are ribs projecting from the inner surface of the gear housing 3, the manufacturing cost of the main guide 32 and the buffer portion 35 can be reduced. [2. Other embodiments]

[0127] Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above embodiments and may take various forms.

[0128] (2a) In the transmission device of the above embodiment, the height of the top point of the discharge section is not necessarily required to be equal to or lower than the height of the top point of the groove. For example, the height of the top point of the discharge section may exceed the height of the top point of the groove.

[0129] (2b) In the transmission device of the above embodiment, it is not necessary for the guide portion to be formed by the recess provided in the inner surface of the gear housing. It is not necessary for the gear housing to have the guide portion.

[0130] (2c) In the transmission device of the above embodiment, it is not necessary for the gear housing to include the first housing and the second housing. That is, it is not necessary for the gear housing to be formed by parts divided in the axial direction of the input gear. Furthermore, it is not necessary for the main guide and the buffer portion to be formed by a rib protruding from the inner surface of the gear housing.

[0131] (2d) In the transmission device of the above embodiment, it is not necessarily required that the rotational axis of the counter gear is located above the rotational axis of the input gear and the rotational axis of the ring gear.

[0132] (2e) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Part of the configuration of the above embodiments may be omitted. At least part of the configuration of the above embodiments may be added to or replaced by the configuration of another embodiment above. Note that all aspects included in the technical idea identified from the wording described in the claims are embodiments of the present disclosure.< / parksperrmechanismus> < / lageraufnahmeabschnitt> < / pufferabschnitt> < / gegenradlager> < / eingangszahnradlager> < / differentialmechanismus> < / hohlrad> < / gegenrad> < / eingangszahnrad> < / getriebemechanismus>

Claims

[1] Transmission device comprising: a gear mechanism; and a gear housing which houses the gear mechanism, wherein the gear mechanism an input gear, a counter gear having an axis of rotation parallel to an axis of rotation of the input gear, a ring gear having an axis of rotation parallel to the axis of rotation of the input gear, a differential housing which is attached to the ring gear, a differential mechanism arranged within the differential housing, an input gear bearing which rotatably supports the input gear, a counter-wheel bearing, which rotatably supports the counter-wheel, a first differential housing bearing which rotatably supports the differential housing, and a second differential housing bearing which rotatably supports the differential housing and is arranged opposite to the first differential housing bearing with respect to the ring gear in an axial direction of the ring gear, wherein the counter wheel a first gear meshing with the input gear, and a second gear having an outer diameter which is smaller than an outer diameter of the first gear, is arranged concentrically to the first gear and meshes with the ring gear, wherein the gear housing a collecting container, a guide which directs the oil scraped off by the ring gear to the collecting container, and a buffer section which is adapted to guide a part of the oil flowing through the guide to the second differential housing bearing, wherein the ring gear is a helical gear which is rotated such that the oil is guided along an axial direction of the ring gear towards the first differential housing bearing when the ring gear rotates in a direction in which the oil is scraped off towards the guide, wherein the guide has a guide surface on which the oil flows towards the collecting container, whereby the guide surface has a groove which is recessed downwards and extends along the axial direction of the ring gear, wherein the buffer section a bottom wall coupled to the groove in the axial direction of the ring gear, and comprises a side wall surrounding the bottom wall, and wherein the side wall comprises an outflow section which causes the oil to flow towards the second differential housing bearing. [2] The transmission device according to claim 1, wherein a height of a top point of the outflow portion is equal to or lower than a height of a top point of the groove. [3] Transmission device according to claim 1 or 2, wherein the gear housing comprises a guide portion which is arranged such that it is offset from the guide in an axial direction of the ring gear, and which guides the oil to the guide, and wherein the guide portion is a recess provided in an inner surface of the gear housing to form a flow path of the oil continuous with the groove. [4] The transmission device according to claim 1 or 2, wherein the guide and the buffer portion are ribs projecting in an axial direction of the input gear from an inner surface of the gear housing.

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