power transmission device

Abstract

To provide a power transmission device capable of smoothly flowing towards a catch tank a lubrication oil scraped up by a rotary member.SOLUTION: A transmission case 3 of a transmission 1 includes: the transmission case 3 which has a bottom wall 4U and a partition wall 4W extending upward from the bottom wall 4U, and in which a lubrication oil O is stored at a bottom part; a final driven gear 12 which has a differential case 11 whose left end part 11b is rotatably supported by the partition wall 4W, and which scrapes up the lubrication oil O stored at the bottom part of the transmission case 3; and a catch tank 19 arranged so as to be continued to the partition wall 4W, and for receiving the lubrication oil scraped up by the final driven gear 12 and storing it. A closing plate 30 positioned on the upstream side of the catch tank 19 with respect to the flow of the lubrication oil scraped up by the final driven gear 12 and extending so as to be continued with respect to the partition wall 4W is provided integrally with the catch tank 19.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a power transmission device. [Background technology]

[0002] BACKGROUND ART A lubricating device for a power distribution device described in Patent Document 1 is known as a lubricating device for a power transmission device.

[0003] The lubrication device for this power distribution device has a collection trough inside the casing that collects lubricating oil splashed up by the power distribution device.

[0004] In addition, the lubrication device of the power distribution device is equipped with a straightening plate having a first straightening wall portion that divides the collecting section of the chain connecting the first gear and the second gear and straightens the flow of lubricating oil caused by the drive of the chain.

[0005] The straightening plate is fixed to the casing using a bracket, and the collecting gutter is attached to this bracket as an integral part. This allows the straightening plate and collecting gutter to be fixed with a common bracket, reducing the number of parts. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Jitsuhei 5-16017 Publication Summary of the Invention [Problem to be solved by the invention]

[0007] However, in conventional lubrication systems for power transmissions, the straightening vanes and the collecting troughs function separately and are not associated with each other, and the straightening vanes do not effectively act on the collecting troughs with respect to the flowing lubricating oil.

[0008] Specifically, the straightening vane does not have the function of smoothly flowing the lubricating oil into the collection trough. Also, in recent years, an increasing number of power transmission devices have been equipped with a catch tank to store the lubricating oil in order to reduce the amount of lubricating oil circulating during operation and thereby reduce stirring resistance, and it is desirable to send the lubricating oil to the catch tank early when operation starts.

[0009] The present invention has been made in light of the above-mentioned circumstances, and aims to provide a power transmission device that can smoothly flow lubricating oil scooped up by the rotating member toward the catch tank. [Means for solving the problem]

[0010] The present invention provides a power transmission device comprising: a case member having a bottom wall and a vertical wall extending upward from the bottom wall, and in which lubricating oil is stored at the bottom; a rotating member having a rotating shaft one end of which is rotatably supported on the vertical wall and which scoops up the lubricating oil stored at the bottom; and a catch tank arranged so as to be continuous with the vertical wall, which receives and stores the lubricating oil scooped up by the rotating member, the vertical wall has a recess, the recess is located upstream of the catch tank with respect to the flow of lubricating oil scooped up by the rotating member, and is recessed in the vertical wall in the direction of the rotational axis of the rotating member, and a fitting hole is provided in the vertical wall around the recess, separately from the recess, below the recess as a mounting portion to which a mounting portion of the catch tank is attached, The catch tank is provided with a flow straightening member that is located upstream of the catch tank with respect to the flow of lubricating oil scooped up by the rotating member and extends continuously from the vertical wall. One Installed on the body The rectifying member is composed of a closing plate that closes the opening of the recess, and the rectifying member is provided with the mounting portion that is mounted to the mounting portion, and by mounting the mounting portion of the rectifying member to the fitting hole of the vertical wall, the opening of the recess located around the fitting hole is covered with the rectifying member. It is characterized by: [Effects of the Invention]

[0011] As described above, according to the present invention, the lubricating oil scooped up by the rotating member can be smoothly flowed toward the catch tank, quickly filling the catch tank with lubricating oil and reducing stirring resistance. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a plan view of a power transmission device according to an embodiment of the present invention. [Figure 2]FIG. 2 is a plan view of a power transmission device according to one embodiment of the present invention, showing the main parts through a transmission case. [Figure 3] FIG. 3 is a view of the power transmission device according to one embodiment of the present invention, seen from the right side with the light case removed. [Figure 4] FIG. 4 is a diagram showing a power transmission device according to one embodiment of the present invention, and is an enlarged view of the catch tank and its surroundings in FIG. [Figure 5] FIG. 5 is a diagram showing a power transmission device according to one embodiment of the present invention, and is an enlarged view of the recess and its surroundings in a state where the closing plate (catch tank) in FIG. 3 has been removed. [Figure 6] FIG. 6 is a perspective view of a catch tank attached to a power transmission device according to one embodiment of the present invention. [Figure 7] FIG. 7 is a top view of a catch tank attached to a power transmission device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] A power transmission device according to one embodiment of the present invention is a power transmission device comprising: a case member having a bottom wall and a vertical wall extending upward from the bottom wall, in which lubricating oil is stored at the bottom; a rotating member having a rotating shaft whose one end is rotatably supported on the vertical wall and which scoops up the lubricating oil stored at the bottom; and a catch tank arranged continuous with the vertical wall and which receives and stores the lubricating oil scooped up by the rotating member, and a straightening member which is located upstream of the catch tank with respect to the flow of lubricating oil scooped up by the rotating member and extends continuous with the vertical wall and is provided integrally with the catch tank.

[0014] As a result, the power transmission device according to one embodiment of the present invention can smoothly flow the lubricating oil scooped up by the rotating member toward the catch tank, thereby filling the catch tank with lubricating oil early and reducing stirring resistance. [Example]

[0015] A power transmission device according to an embodiment of the present invention will now be described with reference to the drawings. 1 to 7 are diagrams showing a power transmission device according to an embodiment of the present invention. In Fig. 1 to 7, the up / down, front / rear, left / right directions are based on the power transmission device installed in a vehicle, and the front / rear direction of the vehicle is defined as the front / rear direction, the left / right direction of the vehicle (vehicle width direction) is defined as the left / right direction, and the up / down direction of the vehicle (vehicle height direction) is defined as the up / down direction.

[0016] First, the configuration will be described. 1, a vehicle is provided with a transmission 1, and an engine 2 is connected to the transmission 1. The transmission 1 and the engine 2 are installed in an engine room (not shown) of the vehicle.

[0017] The transmission 1 includes a transmission case 3, which has a left case 4 that forms the left side and a right case 5 that forms the right side. The left case 4 and the right case 5 are connected by a bolt 41. With this fastening, the right case 5 closes the opening at the right end of the left case 4 with its partition wall 5W and bulging wall portion 5A.

[0018] The engine 2 is connected to the right end of the light case 5 by a bolt (not shown). The transmission 1 of this embodiment constitutes a power transmission device, and the transmission case 3 constitutes a case member.

[0019] As shown in Fig. 2, a transmission mechanism 6 is installed inside the left case 4. The transmission mechanism 6 has an input shaft 7 that extends in the vehicle width direction. The input shaft 7 is installed between the left case 4 and the right case 5, and power from the engine 2 is transmitted to the input shaft 7 that passes through the right case 5.

[0020] The transmission mechanism 6 has a counter shaft 8 and a reverse shaft 9 that extend parallel to the input shaft 7 and are mounted between the left case 4 and the right case 5. The input shaft 7 is provided with a first-speed input gear 7A, a reverse input gear 7R, a second-speed input gear 7B, a third-speed input gear 7C, a fourth-speed input gear 7D, a fifth-speed input gear 7E, and a sixth-speed input gear 7F.

[0021] The first speed input gear 7A, the reverse input gear 7R and the second speed input gear 7B are fixed to the input shaft 7 and rotate integrally with the input shaft 7, while the input gears 7C, 7D, 7E and 7F are rotatable relative to the input shaft 7.

[0022] The counter shaft 8 is provided with a first-speed counter gear 8A, a second-speed counter gear 8B, a third-speed counter gear 8C, a fourth-speed counter gear 8D, a fifth-speed counter gear 8E, a sixth-speed counter gear 8F, a reverse counter gear 8R, and a final drive gear 8G.

[0023] The reverse counter gear 8R, the final drive gear 8G, and the third-speed counter gear 8C to the sixth-speed counter gear 8F are fixed to the counter shaft 8 and rotate integrally with the counter shaft 8, while the first-speed counter gear 8A and the second-speed counter gear 8B are rotatable relative to the counter shaft 8.

[0024] Counter gears 8A to 8F mesh with input gears 7A to 7F, and final drive gear 8G meshes with a final driven gear 12 of a differential device 10.

[0025] Reverse idler gears 9A and 9B are provided on the reverse shaft 9. The reverse idler gear 9A is fixed to the reverse shaft 9 and rotates integrally with the reverse shaft 9, while the reverse idler gear 9B is rotatable relative to the reverse shaft 9.

[0026] The reverse idler gear 9A meshes with the reverse input gear 7R, and the reverse idler gear 9B meshes with the reverse counter gear 8R.

[0027] The input shaft 7, counter shaft 8 and reverse shaft 9 are provided with synchronizers 31A, 31B, 31C and 31D for speed change, respectively.

[0028] The synchronizer 31A is installed between the third-speed input gear 7C and the fourth-speed input gear 7D. The synchronizer 31A has an inner peripheral spline (not shown) and a sleeve 31a provided on the input shaft 7 so as to be movable in the axial direction, and a hub (not shown) located inside the sleeve 31a so as to be rotatable integrally with the input shaft 7, and having an outer peripheral spline that fits with the inner peripheral spline of the sleeve 31a.

[0029] The third-speed input gear 7C is provided with a dog 7c having an outer circumferential spline formed thereon, and the dog 7c rotates integrally with the third-speed input gear 7C. The fourth-speed input gear 7D is provided with a dog 7d having an outer circumferential spline formed thereon, and the dog 7d rotates integrally with the fourth-speed input gear 7D.

[0030] A third-fourth gear shift fork 34A (see FIG. 3) of the shift mechanism is fitted to the sleeve 31a, and when the third-fourth gear shift fork 34A moves the sleeve 31a toward the third-speed input gear 7C, the inner peripheral spline of the sleeve 31a fits into the outer peripheral spline of the dog 7c.

[0031] As a result, the third-speed input gear 7C is connected to the input shaft 7 via the sleeve 31a, and the rotation of the input shaft 7 is transmitted from the third-speed input gear 7C to the counter shaft 8 via the third-speed counter gear 8C.

[0032] As a result, the power of the engine 2 is transmitted from the input shaft 7, the third-speed input gear 7C, and the third-speed counter gear 8C to the counter shaft 8, and then from the final drive gear 8G to the final driven gear 12.

[0033] The power of the engine 2 transmitted to the differential device 10 is transmitted to left and right front drive wheels (not shown) via left and right drive shafts (not shown).

[0034] The synchronization devices 31B, 31C, and 31D have the same configuration and function as the synchronization device 31A, and detailed description thereof will be omitted.

[0035] Shift forks 34B and 34C (see FIG. 3) are fitted to the sleeves of synchronizers 31C and 31D, and a shift fork (not shown) is fitted to the sleeve of synchronizer 31B.

[0036] These shift forks 34A, 34B, 34C and a shift fork not shown are operated by a shift and select shaft 36 (see FIG. 5) via shift yokes corresponding to the shift forks 34A, 34B, 34C and a shift fork not shown in a group of multiple shift yokes 34Y.

[0037] 2, the differential gear 10 is housed in a bulging wall portion 5A provided in the right case 5 and the left case 4. The bulging wall portion 5A bulges out from a partition wall 5W of the light case 5 to the right.

[0038] That is, the partition wall 5W of the right case 5 is located closer to the left case 4 than the tip of the protruding wall portion 5A in the protruding direction. The partition wall 5W forms a partition, and the interior of the left case 4 and the interior of the right case 5 are separated by the partition wall 5W.

[0039] As shown in Figures 2 and 3, the left case 4 has a bottom wall 4U, a partition wall 4W extending upward from the bottom wall 4U, an intermediate wall 4N extending upward from the bottom wall 4U and extending leftward from the front end of the partition wall 4W, a left side wall 4L extending upward from the bottom wall 4U and extending forward from the left end of the intermediate wall 4N, and a front wall 4F extending upward from the bottom wall 4U and extending from the front end of the left side wall 4L toward the light case 5.

[0040] As shown in FIG. 1, the intermediate wall 4N and the partition wall 4W are connected by ribs 42, and the intermediate wall 4N and the partition wall 4W are reinforced by the ribs 42, increasing their rigidity.

[0041] 3, the left case 4 has a top wall 4V and a rear wall 4R. The top wall 4V connects the top end of the front wall 4F, the top end of the partition wall 4W, the top end of the middle wall 4N, and the top end of the left side wall 4L.

[0042] The rear wall 4R curves upward from a rear end 4r of the bottom wall 4U along the outer peripheral edge of the final driven gear 12, which will be described later, and its upper end is connected to the rear end of the top wall 4V. The rear wall 4R has a curved wall portion 4Q and an inclined wall portion 4S, and extends in the left-right direction along the rotation center axis C of the final driven gear 12, with its left end connected to the partition wall 4W so as to be perpendicular to the partition wall 4W.

[0043] The rear wall 4R has a curved wall portion 4Q that curves upward from a rear end portion 4r of the bottom wall 4U along the outer shape of the final driven gear 12, and an inclined wall portion 4S that is above the curved wall portion 4Q and extends obliquely in a straight line from a lower end portion 4f connected to the curved wall portion 4Q, with an upper end portion 4g connected to the rear end portion of the rear wall 4R. In this embodiment, the left side wall 4L, the intermediate wall 4N, and the partition wall 4W form vertical walls, and the rear wall 4R forms a wall portion.

[0044] As shown in FIG. 2, the differential device 10 has a differential case 11 and a final driven gear 12 that is attached to the outer periphery of the differential case 11 and rotates integrally with the differential case 11.

[0045] A differential gear mechanism (not shown) is housed inside the differential case 11. When power is transmitted from the final drive gear 8G to the final driven gear 12, the differential case 11 rotates integrally with the final driven gear 12.

[0046] At this time, the power (rotational speed) of the engine 2 input to the transmission mechanism 6 is changed in speed by the transmission mechanism 6 and transmitted from the differential gear mechanism to the left and right drive shafts (not shown) and the driven front wheels (not shown) in a manner that allows differential rotation.

[0047] The final driven gear 12 is disposed on the left end 11b side of the differential case 11 in the direction of the rotational center axis C with respect to the differential gear mechanism.

[0048] The final driven gear 12 is positioned within the internal space of the left case 4 so as to be close to the partition wall 4W of the left case 4, and is positioned so that the position of the final driven gear 12 overlaps with the positions of the curved wall portion 4Q and the inclined wall portion 4S in the direction in which the rotation center axis C extends.

[0049] The rotational axis C of the final driven gear 12 and the rotational axis C of the differential case 11 are the same, and the direction of the rotational axis C is the vehicle width direction. In addition, the rotational axis C of the final driven gear 12 is parallel to the axial directions of the shafts 7, 8, and 9.

[0050] As shown in Figure 2, the partition wall 4W of the left case 4 is formed on a surface that is approximately perpendicular to the rotation center axis C, is approximately parallel to the rotation plane of the final driven gear 12, and is arranged along and adjacent to the final driven gear 12.

[0051] The partition wall 4W is formed with a bearing support portion 4a into which the bearing 17A is fitted. A left end portion 11b of the differential case 11 is rotatably supported by the bearing support portion 4a via the bearing 17A.

[0052] In addition, an oil seal (not shown) is provided in partition wall 4W. An opening (not shown) is formed in partition wall 4W so that the left drive shaft can pass through, and the oil seal is installed between the opening and the left drive shaft.

[0053] In this embodiment, the differential case 11 forms a rotation shaft of the rotating member, and the final driven gear 12 forms the rotating member. The left end 11b of the differential case 11 forms one end of the rotation shaft, and the direction of the rotation center axis C of the final driven gear 12 forms the direction of the rotation center axis of the rotating member.

[0054] 2, a bearing support portion 5a into which a bearing 17B is fitted is formed in the bulging wall portion 5A of the light case 5. The right end portion 11a of the differential case 11 is rotatably supported by the bearing support portion 5a of the bulging wall portion 5A via the bearing 17B.

[0055] In this manner, the differential case 11 is rotatably supported by the left case 4 and the right case 5, and the final driven gear 12 rotates integrally with the differential case 11 around the central rotation axis C.

[0056] As shown in Figure 3, lubricating oil O is stored in the bottom of the left case 4 and the right case 5, i.e., the bottom of the transmission case 3, and when the vehicle is stopped, the oil level of the lubricating oil O is located between the lower end and the upper end of the bearing support portion 4a.

[0057] A catch tank 19 is installed in the upper space inside the transmission case 3 so as to be located within the upper spaces of both the left case 4 and the right case 5. The catch tank 19 is installed forward (horizontally) away from the final driven gear 12 with respect to the rotational axis C of the final driven gear 12 and above the rotational axis C of the final driven gear 12.

[0058] That is, the catch tank 19 is installed obliquely above and forward of the rotation axis C of the final driven gear 12. In detail, as seen in the axial direction of the rotation axis C as shown in Figure 3, the catch tank 19 is installed in front of the rotation axis C and behind the front end of the final driven gear 12, and is disposed above the front half of the final driven gear 12.

[0059] As shown in FIGS. 6 and 7, the catch tank 19 has a lubricant oil reservoir 20 and a lubricant oil introduction portion 21 having a smaller volume than the lubricant oil reservoir.

[0060] The lubricant reservoir 20 has a bottom wall 20A, a front wall 20B, a rear wall 20C, a left side wall 20D, and a right side wall 20E.

[0061] As shown in FIG. 2, the bottom wall 20A extends in the direction of the rotational axis C of the final driven gear 12, and the lubricating oil reservoir 20 also extends in the direction of the rotational axis C of the final driven gear 12 to ensure sufficient capacity.

[0062] As shown in FIGS. 6 and 7, the front wall 20B extends upward from the front end of the bottom wall 20A, and the rear wall 20C extends upward from the rear end of the bottom wall 20A.

[0063] The left side wall 20D extends upward from the left end of the bottom wall 20A and is connected to the left end of the front wall 20B and the left end of the rear wall 20C.

[0064] The right side wall 20E extends upward from the right end of the bottom wall 20A and is connected to the right end of the front wall 20B and the right end of the rear wall 20C. However, the upper edge of the right side wall 20E is formed lower than the upper edges of the front wall 20B and the rear wall 20C.

[0065] The lubricant introduction portion 21 has a bottom wall 21A, a front wall 21B, a rear wall 21C, and a right side wall 21D.

[0066] The bottom wall 21A extends in the direction of the rotational axis C of the final driven gear 12. As shown in Fig. 6, the bottom wall 21A is located higher than the bottom wall 20A, and the left end of the bottom wall 21A is connected to the upper edge of the right side wall 20E. In other words, the bottom wall 21A is connected to the bottom wall 20A by the right side wall 20E of the lubricating oil reservoir 20.

[0067] The front wall 21B extends upward from the front end of the bottom wall 21A and is formed so as to be continuous with the front wall 20B of the lubricant oil reservoir 20.

[0068] The rear wall 21C extends upward from the rear end of the bottom wall 21A and is formed so as to be continuous with the rear wall 20C of the lubricant oil reservoir 20.

[0069] The right side wall 21D extends upward from the right end of the bottom wall 21A and is connected to the right end of the front wall 21B and the right end of the rear wall 21C.

[0070] The catch tank 19 has an open upper portion surrounded by the upper end portions 19a of the front walls 20B, 21B, rear walls 20C, 21C, left side wall 20D and right side wall 21D, and this opening is formed as an opening 19b through which lubricating oil is introduced.

[0071] Regarding the upper end portion 19a, the rear wall 21C is formed lower than the right side wall 21D, and the front wall 21B is formed higher than the right side wall 21D, so that the shape makes it easy to capture the lubricating oil flowing from the rear in the lubricating oil introduction portion 21.

[0072] As shown in Figure 2, the bottom wall 20A of the lubricating oil storage section 20 and the bottom wall 21A of the lubricating oil introduction section 21 extend in the direction of the rotational center axis C of the final driven gear 12, and are formed so that their length in the left-right direction is longer than their length in the front-to-rear direction.

[0073] The lubricating oil introduction section 21 of the catch tank 19 is positioned so that its left-right position overlaps with the left-right position of the final driven gear 12 so as to cover the top of the final driven gear 12, and the lubricating oil introduction section 21 protrudes toward the light case 5 relative to the partition wall 4W.

[0074] The lubricating oil scooped up by the final driven gear 12 is introduced into the lubricating oil introduction section 21, and then flows from the lubricating oil introduction section 21 to the lubricating oil reservoir section 20, where it is stored.

[0075] Specifically, as shown in Figure 3, the rear wall 4R and the upper part of the partition wall 4W form a flow path 18 through which the lubricating oil scooped up by the final driven gear 12 flows, and guides the lubricating oil O1 scooped up by the final driven gear 12 to a catch tank 19.

[0076] The lubricating oil flowing in the flow path 18 along the rear wall 4R and the partition wall 4W is introduced into a lubricating oil introduction section 21 that protrudes from the partition wall 4W toward the light case 5 and is disposed protruding forward of the flow path 18. In other words, the lubricating oil reservoir 20 is located on the left side wall 4L side of the partition wall 4W and is covered at the rear by the intermediate wall 4N, so that the lubricating oil scooped up by the final driven gear 12 and the lubricating oil flowing in the flow path 18 are not directly introduced into the lubricating oil reservoir 20.

[0077] As shown in FIG. 5, a shallow groove 4u is formed in the partition wall 4W, and the shallow groove 4u is slightly recessed from the partition wall 4W in the direction of the rotation center axis C of the final driven gear 12 (to the left).

[0078] The left case 5 is made by die-casting, and due to constraints on the shapes of bosses for mounting parts, the shape of the mold, and the need for thickness reduction to prevent blowholes, a recess 4h is formed in the partition wall 4W. The recess 4h is deeply recessed from the shallow groove 4u in the direction of the rotation center axis C of the final driven gear 12 (to the left).

[0079] That is, the shallow groove 4u is formed around the recess 4h and is disposed between the wall surface of the partition wall 4W and the recess 4h. More specifically, the shallow groove 4u is located upstream of the recess 4h in the flow direction of the lubricating oil scooped up by the final driven gear 12.

[0080] The recess 4h is formed in the partition wall 4W facing the flow path 18. That is, the recess 4h is located on the upstream side of the catch tank 19 with respect to the flow of the lubricating oil scooped up by the final driven gear 12.

[0081] 4 and 6, the catch tank 19 is provided with a closure plate 30. In this embodiment, the closure plate 30 constitutes a flow straightening member. The closure plate 30 has a horizontal plate portion 30A extending rearward from the rear wall 20C and right side wall 20E of the lubricating oil storage portion 20 of the catch tank 19, and a vertical plate portion 30B extending rearward from an upper portion of the rear wall 20C and extending upward from the horizontal plate portion 30A.

[0082] Specifically, the closure plate 30 has a thin plate shape, and the plate surface of the horizontal plate portion 30A extends rearward from the rear edge of the right side wall 20E so as to be continuous with the surface of the right side wall 20E. The vertical plate portion 30B extends upward from the upper edge of the horizontal plate portion 30A so as to expand the plate surface of the horizontal plate portion 30A upward, connecting the horizontal plate portion 30A to the rear wall 20C. Also, as shown in FIG. 3, the horizontal plate portion 30A is positioned so as to overlap with the final driven gear 12 when viewed in the axial direction.

[0083] The closure plate 30 is disposed on the flow path 18 side (right side) of the recess 4h and closes the opening of the recess 4h. The plate surface of the closure plate 30 is disposed so as to be continuous with the wall surface of the partition 4W, and the plate surface of the closure plate 30 is continuous with the partition 4W, thereby constituting a part of the partition 4W.

[0084] When attached to the left case 4, the closure plate 30 is attached to the partition wall 4W so as to contact the shallow groove 4u. In other words, the closure plate 30 is disposed inside the shallow groove 4u, and the shallow groove 4u is formed larger than the closure plate 30.

[0085] The thickness of the closure plate 30 is approximately the same as the depth of the shallow groove 4u, so that the surface of the closure plate 30 is continuous with the wall surface of the partition wall 4W and is flush with the wall surface of the partition wall 4W.

[0086] 6 and 7, a pin 22 is provided on the left side wall 20D of the lubricant oil reservoir 20. The pin 22 protrudes from the left side wall 20D to the left side toward the wall of the left case 4 (see FIG. 2), and is formed in a tapered shape from the left side wall 20D toward the tip.

[0087] As shown in FIG. 2, an oval stopper hole 4b having a long axis in the vertical direction is formed at the connecting portion between the intermediate wall 4N and the top wall 4V, and the pin 22 is fitted into the stopper hole 4b.

[0088] The pin 22 is formed in a tapered shape, so that the pin 22 can be easily fitted into the fastening hole 4b, and when the pin 22 is fitted into the fastening hole 4b, the pin 22 can move freely in the vertical direction along the long axis of the fastening hole 4b.

[0089] As shown in FIGS. 6 and 7, a protruding piece 20J is provided on the front wall 20B of the lubricant oil reservoir 20, and the protruding piece 20J extends upward from the upper end portion 19a of the front wall 20B.

[0090] The protruding piece 20J is provided with a pressing plate portion 23a, which protrudes forward from the protruding piece 20J. The pressing plate portion 23a is provided with a brush clip 23b, which protrudes leftward from the pressing plate portion 23a.

[0091] As shown in FIG. 6, a brush clip 30a is provided at the lower end of the horizontal plate portion 30A, and the brush clip 30a protrudes leftward from the lower end of the horizontal plate portion 30A.

[0092] A brush clip 30b is provided at the upper end of the vertical plate portion 30B, and the brush clip 30b protrudes leftward from the upper end of the vertical plate portion 30B.

[0093] As shown in Fig. 5, fitting holes 4i and 4j are formed in the shallow groove 4u portion around and extending upward from the recess 4h, in the upper and lower portions of the shallow groove 4u of the recess 4h. The fitting holes 4i and 4j are formed separately at the top and bottom of the recess 4h, and are installed separately from each other vertically. That is, the fitting holes 4i and 4j are formed in the partition wall 4W around the recess 4h.

[0094] A brush clip 30a is fitted into the fitting hole 4i, and a brush clip 30b is fitted into the fitting hole 4j, so that the closure plate 30 is attached to the shallow groove 4u of the partition wall 4W.

[0095] The brush clips 30a and 30b of this embodiment constitute the mounting portion, and the fitting holes 4i and 4j constitute the mounted portion.

[0096] 3, a bulging portion 4v that bulges into the left case 4 is formed at the rear edge of the top wall 4V of the left case 4, and the bulging portion 4v bulges from the left side wall 4L toward the right case 5. A fastening hole 4e is formed in the bulging portion 4v, and the brush clip 23b is fitted into the fastening hole 4e of the bulging portion 4v.

[0097] As shown in Figures 6 and 7, a backing plate 25 is provided at the left end of the rear wall 20C of the lubricant storage section 20 of the catch tank 19, near the pin 22, and the backing plate 25 extends diagonally rearward to the right from the left end of the rear wall 20C.

[0098] The contact plate 25 is elastically deformable so that a tip 25a in the extending direction can move toward and away from the rear wall 20C.

[0099] As shown in FIG. 6, a backing plate 26 is provided on the right side wall 21D of the lubricant introduction portion 21 of the catch tank 19, and the backing plate 26 extends obliquely forward and rightward from the right side wall 21D.

[0100] The contact plate 26 is elastically deformable so that a tip 26a in the extending direction can move toward and away from the right side wall 21D.

[0101] When the pin 22 is fitted into the stop hole 4b, the backing plate 25 abuts against the intermediate wall 4N of the left case 4 and is elastically deformed into a bent state between the intermediate wall 4N of the left case 4 and the rear wall 20C (i.e., a state in which the tip 25a of the backing plate 25 is close to the rear wall 20C).

[0102] As a result, the pin 22 is pressed firmly against the stop hole 4b, which suppresses rattles and stabilizes the posture of the catch tank 19.

[0103] In the assembled state, the backing plate 26 abuts against the partition wall 5W of the light case 5 and is elastically deformed into a bent state between the right side wall 21D and the partition wall 5W of the light case 5 (i.e., a state in which the tip 26a of the backing plate 26 is close to the right side wall 21D).

[0104] As a result, with brush clip 23b fitted into stop hole 4e and brush clips 30a, 30b fitted into fitting holes 4i, 4j, the elastic force of backing plate 26 presses brush clips 23b, 30a, 30b firmly against stop hole 4e and fitting holes 4i, 4j, preventing them from slipping out, and the posture of catch tank 19 is stabilized by support from partition wall 5W of light case 5.

[0105] As shown in Fig. 7, a discharge hole 20a is formed in the bottom wall 20A of the lubricating oil reservoir 20, and the lubricating oil stored in the lubricating oil reservoir 20 is discharged from the discharge hole 20a. A discharge hole 20b is formed in the front wall 20B, and the discharge hole 20b is located obliquely above and rearward of the third-speed counter gear 8C (see Fig. 2). The lubricating oil discharged from the discharge hole 20b is supplied to the third-speed counter gear 8C.

[0106] 3, a groove 4d is formed in the partition wall 4W of the left case 4. The groove 4d extends from a communication portion 4q that communicates with the bearing support portion 4a toward the catch tank 19, and has an open end in the extending direction.

[0107] The discharge hole 20a of the catch tank 19 is disposed near the open end of the groove portion 4d, and the lubricating oil discharged from the discharge hole 20a is introduced into the groove portion 4d.

[0108] As a result, the lubricating oil is introduced into the bearing support portion 4a through the groove portion 4d, and the bearing 17A is lubricated by the lubricating oil.

[0109] 2, an oil gutter 27 is housed in the left case 4. The oil gutter 27 is located forward of the input shaft 7 and above the reverse idler gear 9A.

[0110] The oil gutter 27 has an oil gutter body 27A extending leftward from above the reverse idler gear 9A, and a lubricating oil introduction portion 27B bending rearward from the left end of the oil gutter body 27A and extending to the bearing 17C.

[0111] The left end of the input shaft 7 is rotatably supported by a bearing support (not shown) formed on the left wall 4L of the left case 4 via a bearing 17C.

[0112] The left end of the counter shaft 8 is rotatably supported via a bearing 17D on a bearing support portion 4c formed on the left wall 4L of the left case 4 (see FIG. 2).

[0113] A groove (not shown) is formed in the left wall 4L of the left case 4, which connects the bearing support portion supporting the left end of the input shaft 7 and the bearing support portion supporting the left end of the countershaft 8.

[0114] The lubricating oil scooped up by the reverse idler gear 9A is introduced into the oil gutter body 27A of the oil gutter 27. The lubricating oil introduced into the oil gutter body 27A flows from the oil gutter body 27A to the lubricating oil inlet 27B, and is introduced from the lubricating oil inlet 27B to the bearing support that supports the bearing 17C. As a result, the bearing 17C is lubricated by the lubricating oil.

[0115] Furthermore, the lubricating oil is introduced from the bearing support portion that supports the bearing 17C through the groove to the bearing support portion 4c that supports the bearing 17D, thereby lubricating the bearing 17D with the lubricating oil.

[0116] As shown in Figure 3, the upper end 4g of the inclined wall portion 4S in the inclined direction is located directly above the catch tank 19, and the lower end 4f of the inclined wall portion 4S in the inclined direction is located rearward (horizontally) away from the catch tank 19 and below the catch tank 19.

[0117] The rear wall 21C of the lubricant introduction section 21 of the catch tank 19, to which the front edge of the closure plate 30 is connected, faces the inclined wall section 4S, and is positioned so that the upper end of the rear wall 21C is closer to the inclined wall section 4S than the lower end of the rear wall 21C.

[0118] The rear wall 21C faces the flow of lubricating oil flowing through the flow passage 18 (the flow of lubricating oil scooped up by the final driven gear 12) and acts to scrape off the lubricating oil that is carried around by the final driven gear 12.

[0119] A triangular space is formed above the final driven gear 12 by the inclined wall portion 4S, the rear wall 21C, and the final driven gear 12.

[0120] The rear wall 20C of the lubricant oil reservoir 20 and the rear wall 21C of the lubricant oil introduction section 21 constitute opposing walls with a portion of the opening 19b formed in the upper end 19a. The upper end 30c of the closure plate 30 is located higher than the upper end 19a of the rear wall 21C in the height direction of the transmission 1 (see FIG. 4).

[0121] Next, the effects of the transmission 1 of this embodiment will be described. The transmission case 3 of this embodiment has a bottom wall 4U and a partition wall 4W extending upward from the bottom wall 4U, and has a transmission case 3 in which lubricating oil O is stored at the bottom, a differential case 11 whose left end 11b is rotatably supported on the partition wall 4W, a final driven gear 12 that scoops up the lubricating oil O stored at the bottom of the transmission case 3, and a catch tank 19 that is arranged continuous with the partition wall 4W and receives and stores the lubricating oil scooped up by the final driven gear 12.

[0122] In addition, a blocking plate 30 is provided integrally with the catch tank 19, located upstream of the catch tank 19 with respect to the flow of lubricating oil scooped up by the final driven gear 12 and extending continuously from the partition wall 4W.

[0123] As a result, the lubricating oil scooped up by the final driven gear 12 can flow smoothly toward the catch tank 19 through the flow path 18 along the partition wall 4W and the closure plate 30, allowing more lubricating oil to be sent to the catch tank 19.

[0124] Therefore, the oil level of the lubricating oil O stored in the bottom surface of the transmission case 3 can be lowered early, reducing the stirring resistance of each of the shafts 8, 9 immersed in the lubricating oil O. As a result, the power transmission efficiency of the transmission 1 can be improved, and the fuel efficiency of the engine 2 can be improved.

[0125] On the other hand, the partition 4W of the transmission case 3 in this embodiment has a recess 4h, which is located upstream of the catch tank 19 with respect to the flow of lubricating oil scooped up by the final driven gear 12, opens toward the flow path 18 so as to face the flow of lubricating oil, and is recessed relative to the partition 4W in the direction of the rotational center axis C of the final driven gear 12.

[0126] Therefore, if the recess 4h is exposed and the opening of the recess 4h is exposed, the lubricating oil O1 (see Figure 3) scooped up by the final driven gear 12 will create a vortex at the opening of the recess 4h, and the lubricating oil flowing out from the opening of the recess 4h will obstruct the flow of the lubricating oil.

[0127] As a result, the amount of lubricating oil scooped up by the final driven gear 12 that reaches the catch tank 19 decreases, making it impossible to store a sufficient amount of lubricating oil in the catch tank 19, and making it difficult to lower the oil level of the lubricating oil O. As a result, the stirring resistance of the gears of the shafts 8 and 9 immersed in the lubricating oil O increases.

[0128] In the transmission 1 of this embodiment, a closing plate 30 integral with the catch tank 19 closes the recess 4h.

[0129] This prevents the lubricating oil scooped up by the final driven gear 12 on the upstream side of the flow of lubricating oil relative to the catch tank 19 from entering the recess 4h, and prevents the flow of lubricating oil scooped up by the final driven gear 12 from being disrupted and stagnating on the upstream side of the catch tank 19.

[0130] As a result, the lubricating oil scooped up by the final driven gear 12 can flow smoothly toward the catch tank 19 through the flow path 18 along the partition wall 4W and the closure plate 30, allowing more lubricating oil to be sent to the catch tank 19.

[0131] Therefore, the oil level of the lubricating oil O stored in the bottom surface of the transmission case 3 can be lowered early, reducing the stirring resistance of each of the shafts 8, 9 immersed in the lubricating oil O. As a result, the power transmission efficiency of the transmission 1 can be improved, and the fuel efficiency of the engine 2 can be improved.

[0132] Furthermore, the closure plate 30 is positioned so that its plate surface is continuous with the wall surface of the partition 4W and its inner surface is approximately flush, thereby preventing the closure plate 30 from protruding from the partition 4W toward the light case 5 and preventing the lubricating oil scooped up by the final driven gear 12 from colliding with the closure plate 30.

[0133] This more effectively prevents the flow of lubricating oil from becoming turbulent and accumulating upstream of the catch tank 19, allowing the lubricating oil to flow smoothly toward the catch tank 19, and enabling more lubricating oil to be sent to the catch tank 19.

[0134] Furthermore, since the closure plate 30 is provided integrally with the catch tank 19, an increase in the number of parts can be prevented, and the workability of assembling the catch tank 19 to the left case 4 can be improved.

[0135] Furthermore, according to the transmission 1 of this embodiment, fitting holes 4i, 4j are provided in the shallow groove 4u of the partition wall 4W around the recess 4h, and brush clips 30a, 30b that are inserted and fixed into the fitting holes 4i, 4j are provided on the closure plate 30. Furthermore, the fitting holes 4i, 4j are formed separately in the upper and lower parts of the recess 4h.

[0136] This allows the closure plate 30 to be fixed to the partition wall 4W in a state where the closure plate 30 closes the recess 4h, and the closure plate 30 can reliably close the recess 4h.

[0137] Furthermore, by attaching the closure plate 30 to the partition wall 4W using the brush clips 30a and 30b, the closure plate 30 can be used to attach the catch tank 19 to the partition wall 4W.

[0138] This reduces the number of brush clips 23b formed on the main body of catch tank 19, thereby reducing the manufacturing cost of catch tank 19. In other words, only one brush clip 23b needs to be provided on the main body of catch tank 19.

[0139] That is, the catch tank 19 can be attached to the partition wall 4W by utilizing the brush clips 30a and 30b for firmly attaching the closure plate 30 to the partition wall 4W and reliably closing the recess 4h.

[0140] Furthermore, according to the transmission 1 of this embodiment, the upper end portion 19a of the catch tank 19 has an opening 19b through which the lubricating oil is introduced.

[0141] The transmission case 3 has a rear wall 4R extending upward from the rear end 4r of the bottom wall 4U in a direction perpendicular to the rotational center axis C of the final driven gear 12, and the rear wall 4R has an inclined wall portion 4S that guides the lubricating oil scooped up by the final driven gear 12 diagonally toward the catch tank 19.

[0142] The upper end 4g of the inclined wall portion 4S in the inclined direction is located directly above the catch tank 19, and the lower end 4f of the inclined wall portion 4S in the inclined direction is spaced apart from the catch tank 19 in a direction perpendicular to the direction of the rotation center axis C of the final driven gear 12 and is located below the catch tank 19.

[0143] This allows the lubricating oil scooped up by the catch tank 19 to be directed along the inclined wall portion 4S into the catch tank 19, allowing a larger amount of lubricating oil to be sent smoothly and efficiently to the catch tank 19. This makes it possible to more effectively reduce the stirring resistance of the gears of the shafts 8 and 9 immersed in the lubricating oil O.

[0144] Furthermore, according to the transmission 1 of this embodiment, the catch tank 19 faces the inclined wall portion 4S in a direction perpendicular to the rotational center axis C of the final driven gear 12, and has a rear wall 21C of the lubricating oil introduction portion 21 at the upper end of which a portion of the opening 19b is formed.

[0145] The rear wall 21C is disposed at an angle to the flow of the lubricating oil and functions to direct the flow of the lubricating oil upward and cause it to pass over the upper end 19a of the rear wall 21C.

[0146] In addition, a blocking plate 30 is provided on the rear wall 20C of the lubricating oil storage section 20, and the upper end 30c of the blocking plate 30 is located higher than the upper end 19a of the rear wall 21C of the lubricating oil introduction section 21 in the height direction of the transmission 1.

[0147] As a result, when a recess 4h is formed near the upstream side of the catch tank 19 in the direction of flow of the lubricating oil, the recess 4h can be closed by the closing plate 30.

[0148] This prevents the lubricating oil scooped up by the final driven gear 12 from entering the recess 4h just before being introduced into the lubricating oil introduction section 21, and more effectively prevents the flow of lubricating oil scooped up by the final driven gear 12 from being disrupted and stagnating upstream of the catch tank 19.

[0149] As a result, the lubricating oil scooped up by the final driven gear 12 can flow smoothly along the partition wall 4W and the closure plate 30 toward the catch tank 19, allowing more lubricating oil to be sent to the catch tank 19.

[0150] While an embodiment of the present invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made thereto without departing from the scope of the present invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0151] 1...transmission (power transmission device), 3...transmission case (case member), 4f...lower end (lower end of inclined wall portion), 4g...upper end (upper end of inclined wall portion), 4h...recess, 4i, 4j...fitting hole (mounting portion), 4L...left side wall (vertical wall), 4N...intermediate wall (vertical wall), 4R...rear wall (wall portion), 4r...rear end (one end of bottom wall), 4S...inclined wall portion, 4U...bottom wall, 4W...partition wall (vertical wall), 11...differential case (rotating shaft), 11b...left end (one end of rotating shaft), 12...final driven gear (rotating member), 19...catch tank, 19a...upper end (upper end of opposing wall), 19b...opening, 21C...rear wall (opposing wall), 30...blocking plate (straightening member), 30a, 30b...brush clip (mounting portion), O...lubricating oil

Claims

1. a case member having a bottom wall and a vertical wall extending upward from the bottom wall, the case member having a bottom portion in which lubricating oil is stored; a rotating member having a rotating shaft whose one end is rotatably supported by the vertical wall, and which scoops up the lubricating oil stored in the bottom portion; a catch tank disposed continuously with the vertical wall and configured to receive and store lubricating oil scooped up by the rotating member, The vertical wall has a recess, the recess is located upstream of the catch tank with respect to a flow of lubricating oil scooped up by the rotating member, and is recessed with respect to the vertical wall in a direction toward the rotation axis of the rotating member, a fitting hole as a mounting portion to which a mounting portion of the catch tank is attached is provided separately from the recess on the vertical wall around the recess, below the recess; the catch tank is provided integrally with a straightening member that is located upstream of the catch tank with respect to the flow of lubricating oil scooped up by the rotating member and extends continuously from the vertical wall, the rectifying member is composed of a closing plate that closes the opening of the recess, the rectifying member is provided with the mounting portion that is attached to the mounting portion, a power transmission device, characterized in that the mounting portion of the rectifying member is attached to the fitting hole of the vertical wall, thereby covering the opening of the recess located around the fitting hole with the rectifying member.

2. A power transmission device as described in Claim 1, characterized in that the mounting portion is also provided above the recess and is installed separately above and below the recess.

3. The vertical wall has a shallow groove around the recess, the shallow groove is a shallow groove recessed in the vertical wall in a direction of the rotation central axis of the rotation member and is arranged along an opening of the recess, 3. The power transmission device according to claim 1, wherein the flow regulating member is disposed inside the shallow groove so as to be in contact with the shallow groove.

4. An opening for introducing lubricating oil is provided at the upper end of the catch tank, the case member has a wall portion extending upward from one end of the bottom wall in a direction perpendicular to the rotation center axis of the rotating member, The wall portion has an inclined wall portion that guides the lubricating oil scooped up by the rotating member in an oblique direction toward the catch tank, The upper end of the inclined wall portion is located directly above the catch tank, 4. A power transmission device according to claim 1, wherein the lower end of the inclined wall portion is spaced apart from the catch tank in a direction perpendicular to the direction of the rotational axis of the rotating member and is positioned lower than the catch tank.

5. the catch tank has an opposing wall that faces the inclined wall portion in a direction perpendicular to the rotation central axis of the rotating member, and has an opposing wall at an upper end of which a part of the opening is formed; The flow straightening member is provided on the opposing wall, 5. The power transmission device according to claim 4, wherein an upper end of the rectifying member is located higher than an upper end of the opposing wall in the height direction of the power transmission device.

Images