Lubrication structure of vehicle transmissions

Abstract

To provide a lubrication structure of a vehicle transmission which can collect a larger amount of a lubrication oil with a collection part and supply a larger amount of the lubrication oil to lubricated portions.SOLUTION: A lubrication structure of a transmission 1 has a collection part 16 which collects a lubrication oil scraped to a left side wall 2D side by rotation of a final drive gear 7E to supply the lubrication oil to lubricated portions (a propeller shaft and an engagement part between the final drive gear 7E and a final driven gear 8B). The collection part 16 has: a vertical wall part 2F extending from an upper wall 2B to a counter shaft 7; and a curved part 2G provided at the vertical wall part 2F. The vertical wall part 2F continues into a partition wall 3A at a front end and continues into a partition wall 4A at a rear end. The curved part 2G bends from a lower end of the vertical wall part 2F to the left side wall 2D side and then extends upward, and the lubrication oil is stored therein.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a lubrication structure for a vehicle transmission.

Background Art

[0002] A transmission mounted on a vehicle such as an automobile scoops up lubricating oil stored at the bottom of the transmission case by gears and supplies it to lubricating parts inside the transmission case.

[0003] As a conventional lubrication structure, a gear case structure described in Patent Document 1 is known. This gear case structure supplies lubricating oil from an accommodation chamber in which gears are arranged to an external storage chamber in which a bearing for the output gear to slide is arranged. It is arranged above the axis of the output gear and has a shielding wall portion that blocks the movement of the lubricating oil scooped up by the gears, and a lubricating oil external supply hole formed at the boundary between the accommodation chamber and the external storage chamber.

[0004] In addition to this, the gear case structure includes a lubricating oil guide that is arranged below the shielding wall portion and supplies the lubricating oil scooped up by the output gear from the accommodation chamber to the bearing arranged in the external storage chamber through the lubricating oil external supply hole. The lubricating oil guide is provided separately from the gear case.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] It seems there is a typo in the original text where "[[ID=2??]]" should probably be something else. I've translated it as best as possible with the given text.However, in conventional gear case structures, a gap is formed between the gear case and the lubricating oil guide, causing the lubricating oil scraped up by the output gear to leak out through the gap. This makes it difficult for the lubricating oil guide to collect a sufficient amount of lubricating oil, and there is a risk that the lubricating oil cannot be efficiently supplied from the external storage chamber to the bearing.

[0007] This invention was made in view of the above circumstances, and aims to provide a lubrication structure for a vehicle transmission that can collect a large amount of lubricating oil with a collection unit and supply a larger amount of lubricating oil to the lubrication parts. [Means for solving the problem]

[0008] The present invention A counter shaft having a final drive gear, an output shaft having a final driven gear that meshes with the final drive gear, and bottom Lubricating oil is stored in the part, and the The counter shaft and the output shaft A transmission case having a housing chamber. S The accommodation chamber is provided with a first vertical wall and the counter In the axial direction of the axis, the phi Narudrive A second vertical wall opposite the first vertical wall with the gear in between, and the counter Extending in the axial direction of the shaft, counter axis left The first vertical wall and the second vertical wall are connected in one direction. left Side walls and, A right-side wall connecting the first vertical wall and the second vertical wall to the right of the counter shaft, The aforementioned counter Extending in the axial direction of the axis, above the counter axis, the first vertical wall and the second vertical wall The left side wall and the right side wall The upper wall that connects them , extending in the axial direction of the counter shaft, and below the counter shaft, a lower wall connecting the first vertical wall, the second vertical wall, the left wall, and the right wall It is composed of Furthermore, the right side wall is inclined to approach the left side wall as it moves from top to bottom, the output shaft is positioned diagonally above and to the right of the counter shaft and closer to the right side wall than the left side wall, and the counter shaft is positioned closer to the left side wall than the right side wall. A lubrication structure for a vehicle transmission, the aforementioned Final Drive The rotation of the gears causes the aforementioned left It has a collection unit that collects the lubricating oil scraped up on the side wall and supplies it to the lubrication area, and the collection unit extends from the upper wall to the counter It has a vertical wall portion extending toward the axis and a curved portion provided on the vertical wall portion, one end of the vertical wall portion being continuous with the first vertical wall and the other end being continuous with the second vertical wall, and the curved portion extending from the lower end of the vertical wall portion left After bending toward the side wall, it extends upward Furthermore, the collection section is formed on the left side wall side of the axis of the counter shaft. It is characterized by having this feature. [Effects of the Invention]

[0009] As described above, according to the present invention, a large amount of lubricating oil can be collected by the collection unit, and a larger amount of lubricating oil can be supplied to the lubrication part. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram of an engine and a vehicle transmission according to one embodiment of the present invention. [Figure 2] Figure 2 shows a lubrication structure of a vehicle transmission according to one embodiment of the present invention, and is a cross-sectional view of the rear of the vehicle transmission with the output shaft cut in the longitudinal direction. [Figure 3] Figure 3 shows the front cover as viewed from the III-III direction, with the rear cover removed from the front cover in Figure 2. [Figure 4] Figure 4 shows the rear cover as viewed from the IV-IV direction, after removing the rear cover from the front cover shown in Figure 2. [Modes for carrying out the invention]

[0011] A lubrication structure for a vehicle transmission according to one embodiment of the present invention comprises a rotating shaft having gears and a transmission case having a storage chamber for gears and storing lubricating oil at its bottom. The lubrication structure for a vehicle transmission comprises a housing chamber comprising a first vertical wall, a second vertical wall facing the first vertical wall with the gears in the axial direction of the rotating shaft, a side wall extending in the axial direction of the rotating shaft and connecting the first vertical wall and the second vertical wall on the side of the rotating shaft, and an upper wall extending in the axial direction of the rotating shaft and connecting the first vertical wall and the second vertical wall above the rotating shaft, and having a collection unit that collects lubricating oil scraped up to the side wall side by the rotation of the gears and supplies it to the lubrication part, the collection unit having a vertical wall portion extending from the upper wall toward the rotating shaft and a curved portion provided on the vertical wall portion, one end of the vertical wall portion being continuous with the first vertical wall and the other end being continuous with the second vertical wall, and the curved portion bending toward the side wall side from the lower end of the vertical wall portion and then extending upward.

[0012] As a result, the lubrication structure of the vehicle transmission according to an embodiment of the present invention can collect a large amount of lubricating oil by the collecting portion and supply more lubricating oil to the lubricating portion.

Example

[0013] Hereinafter, the lubrication structure of the vehicle transmission according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 4 are diagrams showing the lubrication structure of the vehicle transmission according to an embodiment of the present invention.

[0014] In FIGS. 1 to 4, the vertical, front-rear, and left-right directions are based on the vehicle transmission installed in the vehicle. The front-rear direction of the vehicle is the front-rear direction, the left-right direction (vehicle width direction) of the vehicle is the left-right direction, and the vertical direction (vehicle height direction) of the vehicle is the vertical direction.

[0015] First, the configuration will be described. In FIG. 1, a transmission 1 mounted on a vehicle 50 includes a transmission case 2. The transmission case 2 includes a front case 3 and a rear case 4, and a transmission mechanism 5 is accommodated in the front case 3 and the rear case 4. The transmission 1 of the present embodiment constitutes a vehicle transmission.

[0016] The transmission mechanism 5 includes an input shaft 6, a counter shaft 7, an output shaft 8, and a reverse shaft 9. The input shaft 6 is connected to the engine 20 via a clutch 21, and the power of the engine 20 is transmitted to the input shaft 6 when the clutch 21 is engaged.

[0017] A first-speed input gear 6A, a second-speed input gear 6B, a third-speed input gear 6C, a fourth-speed input gear 6D, a fifth-speed input gear 6E, and a reverse idler gear 6R are attached to the input shaft 6.

[0018] A first-speed counter gear 7A, a second-speed counter gear 7B, a third-speed counter gear 7C, a fourth-speed counter gear 7D, and a final drive gear 7E are attached to the counter shaft 7.

[0019] The 1st gear input gear 6A, 2nd gear input gear 6B, 3rd gear input gear 6C, and 4th gear input gear 6D mesh with the 1st gear counter gear 7A, 2nd gear counter gear 7B, 3rd gear counter gear 7C, and 4th gear counter gear 7D, as these gears constitute the same gear ratio.

[0020] The 1st gear input gear 6A, 2nd gear input gear 6B, 5th gear input gear 6E, and reverse idler gear 6R are fixed to the input shaft 6, while the 3rd gear input gear 6C and 4th gear input gear 6D are connected to the input shaft 6 so as to be rotatable relative to it.

[0021] The first-speed counter gear 7A and the second-speed counter gear 7B are connected to the counter shaft 7 so as to be able to rotate relative to each other, while the third-speed counter gear 7C, the fourth-speed counter gear 7D, and the final drive gear 7E are fixed to the counter shaft 7.

[0022] A 5-speed output gear 8A and a final driven gear 8B are mounted on the output shaft 8, and the 5-speed output gear 8A and the final driven gear 8B are fixed to the output shaft 8.

[0023] A reverse gear 9A is attached to the reverse shaft 9, and the reverse gear 9A is fixed to the reverse shaft 9.

[0024] The counter shaft 7 is equipped with a 1st-2nd speed synchronous device 10. The 1st-2nd speed synchronous device 10 moves axially forward of the counter shaft 7 to connect the 1st speed counter gear 7A to the counter shaft 7 so that the 1st speed counter gear 7A rotates integrally with the counter shaft 7, and moves axially backward of the counter shaft 7 to connect the 2nd speed counter gear 7B to the counter shaft 7 so that the 2nd speed counter gear 7B rotates integrally with the counter shaft 7.

[0025] For example, when the 1st gear input gear 6A is connected to the input shaft 6 by the 1st-2nd gear synchronous device 10, the power of the engine 20 is transmitted from the input shaft 6 to the output shaft 8 via the 1st gear input gear 6A, the 1st gear counter gear 7A, the 1st-2nd gear synchronous device 10, the counter shaft 7, the final drive gear 7E, and the final driven gear 8B.

[0026] The output shaft 8 is connected to a differential on the rear wheel side (not shown) via a propeller shaft (not shown), and the differential on the rear wheel side is connected to the rear wheels (not shown) via a drive shaft (not shown). The output shaft 8 transmits power from the engine 20 to the rear wheels via the propeller shaft and the differential on the rear wheel side.

[0027] The transmission 1 of this embodiment is applied to a front-engine, rear-wheel-drive (FR) vehicle in which the input shaft 6, counter shaft 7, output shaft 8, and reverse shaft 9 are arranged parallel to each other in the front-rear direction. However, the transmission 1 is not limited to applications to FR vehicles.

[0028] The input shaft 6 is equipped with a 3-4 speed synchronous device 11. The 3-4 speed synchronous device 11 moves axially along the input shaft 6 to connect the 3-speed input gear 6C or the 4-speed input gear 6D to the input shaft 6 so that the 3-speed input gear 6C or the 4-speed input gear 6D rotates integrally with the input shaft 6.

[0029] For example, when the 3rd gear input gear 6A is connected to the input shaft 6 by the 3rd-4th gear synchronous device 11, the power of the engine 20 is transmitted from the input shaft 6 to the output shaft 8 via the 3rd-4th gear synchronous device 11, the 3rd gear input gear 6C, the 3rd gear counter gear 7C, the counter shaft 7, the final drive gear 7E, and the final driven gear 8B.

[0030] The input shaft 6 is equipped with a 5-speed synchronous device 12, which connects the 5-speed input gear 6E and the 5-speed output gear 8A to directly transmit power from the engine 20 from the input shaft 6 to the output shaft 8.

[0031] The 5th speed input gear 6E consists of a dog formed at the rear end of the input shaft 6, and the 5th speed output gear 8A consists of a dog formed at the front end of the output shaft 8.

[0032] The reverse shaft 9 is movable in the axial direction by a dog clutch (not shown). When the vehicle 50 is moving in reverse, the 1st-2nd gear synchronous device 10 connects the 1st gear counter gear 7A to the counter shaft 7, and in this state, the reverse gear 9A is connected to the reverse idler gear 6R and the 1st-2nd gear synchronous device 10. When the reverse idler gear 6R is connected to the 1st-2nd gear synchronous device 10, the reverse gear 9A meshes with a gear provided on the 1st-2nd gear synchronous device 10.

[0033] As a result, the power of the engine 20 is transmitted from the input shaft 6 to the output shaft 8 via the reverse idler gear 6R, reverse gear 9A, 1st-2nd gear synchronous device 10, counter shaft 7, final drive gear 7E, and final driven gear 8B.

[0034] In this embodiment, the counter shaft 7 constitutes the rotational shaft, and the final drive gear 7E constitutes the gear.

[0035] As shown in Figures 3 and 4, the front case 3 and the rear case 4 are provided as separate components, and the rear case 4 is connected to the front case 3 by bolts (not shown).

[0036] As shown in Figures 1 and 2, the input shaft 6, counter shaft 7, and reverse shaft 9 are housed in the front case 3.

[0037] As shown in Figures 2 and 4, the final drive gear 7E and the final driven gear 8B are housed in the rear case 4. As shown in Figure 1, the rear end of the output shaft 8 protrudes rearward from the rear case 4, and the propeller shaft is connected to the rear end of the output shaft 8.

[0038] As shown in Figure 2, a partition wall 3A is provided at the rear end of the front case 3. The output shaft 8 is rotatably supported by the partition wall 3A via a bearing 13A, and the counter shaft 7 is inserted through an insertion hole (not shown) formed in the partition wall 3A and installed in the front case 3 and the rear case 4.

[0039] The rear case 4 is provided with a partition wall 4A, which faces partition wall 3A in the axial direction of the counter shaft 7. The output shaft 8 is rotatably supported by partition wall 4A via a bearing 13B.

[0040] The front end of the output shaft 8 is connected to the rear end of the input shaft 6 via a needle bearing 13C so as to be rotatable relative to it. In this embodiment, partition wall 3A constitutes the first vertical wall, and partition wall 4A constitutes the second vertical wall.

[0041] The front case 3 has an upper wall, a lower wall, a left wall, and a right wall. Below, only the upper wall 3B, lower wall 3C, left wall 3D, and right wall 3E of the front case 3 behind bulkhead 3A will be described.

[0042] As shown in Figure 4, the rear case 4 has an upper wall 4B, a lower wall 4C, a left side wall 4D, and a right side wall 4E, and the upper wall 4B, lower wall 4C, left side wall 4D, and right side wall 4E are fastened to the upper wall 3B, lower wall 3C, left side wall 3D, and right side wall 3E of the front case 3, respectively, by bolts.

[0043] Hereinafter, the upper wall 3B, lower wall 3C, left side wall 3D, and right side wall 3E will be described as the upper wall 2B, lower wall 2C, left side wall 2D, and right side wall 2E, which are formed by fastening the upper wall 4B, lower wall 4C, left side wall 4D, and right side wall 4E together. In this embodiment, the left side wall 2D constitutes a side wall.

[0044] The left wall 2D extends in the axial direction of the output shaft 8 and connects partition walls 3A and 4A to the left of the output shaft 8. The right wall 2E extends in the axial direction of the output shaft 8 and connects partition walls 3A and 4A to the right of the output shaft 8.

[0045] As shown in Figures 3 and 4, the right side wall 2E is inclined to approach the left side wall 2D as it goes from top to bottom, and the length of the upper wall 2B in the vehicle width direction is longer than the length of the lower wall 2C in the vehicle width direction.

[0046] As shown in Figure 2, the upper wall 2B extends in the axial direction of the output shaft 8 and connects partition walls 3A and 4A above the output shaft 8. The lower wall 2C extends in the axial direction of the output shaft 8 and connects partition walls 3A and 4A below the output shaft 8.

[0047] The transmission case 2 has a housing chamber 14 enclosed by bulkhead 3A, bulkhead 4A, upper wall 2B, lower wall 2C, left wall 2D, and right wall 2E, and the final drive gear 7E and final driven gear 8B are housed in the housing chamber 14.

[0048] In this embodiment, partition wall 4A faces partition wall 3A in the axial direction of the counter shaft 7, with the final drive gear 7E and final driven gear 8B in between.

[0049] As shown in Figures 3 and 4, the output shaft 8 is positioned diagonally above and to the right of the counter shaft 7. The output shaft 8 is located on the right wall 2E side of the left wall 2D, and the counter shaft 7 is located on the left wall 2D side of the right wall 2E.

[0050] A collection unit 16 is provided in the containment chamber 14, which is located above the final drive gear 7E and is formed on the left side wall 2D side of the axis C1 of the counter shaft 7. In this embodiment, the axis C1 constitutes the axis of the rotation shaft.

[0051] The collection unit 16 has a vertical wall portion 3F extending from the upper wall 3B of the front case 3 toward the output shaft 8, a curved portion 3G provided on the vertical wall portion 3F, a vertical wall portion 4F extending from the upper wall 4B of the rear case 4 toward the output shaft 8, and a curved portion 4G provided on the vertical wall portion 4F.

[0052] As shown in Figure 2, the front end 3f (one end) of the vertical wall section 3F is continuous with the partition wall 3A, and the rear end 4r (the other end) of the vertical wall section 4F is continuous with the partition wall 4A. The rear end 3r of the vertical wall section 3F abuts against the front end 4f of the partition wall 4A. In other words, the vertical wall sections 3F and 4F are provided integrally with the partition walls 3A and 4A, and extend from partition wall 3A to partition wall 4A.

[0053] The curved section 3G extends upward after bending from the lower end of the vertical wall section 3F towards the left wall 2D, and is capable of storing lubricating oil. The curved section 4G extends upward after bending from the lower end of the vertical wall section 4F towards the left wall 2D, and is capable of storing lubricating oil.

[0054] In the following description, the vertical wall sections 3F and 4F, in which the rear case 4 is attached to the front case 3 and the rear end 3r of the vertical wall section 3F is in contact with the front end 4f of the bulkhead 4A, will be referred to as the vertical wall section 2F, and the curved sections 3G and 4G will be referred to as the curved section 2G.

[0055] In other words, the vertical wall section 2F and the curved section 2G are continuous with partition walls 3A and 4A, and extend from partition wall 3A to partition wall 4A.

[0056] As shown in Figure 3, lubricating oil O is stored at the bottom of the storage chamber 14, and the oil level of the lubricating oil O is at approximately the same height as the upper end of the final drive gear 7E when the engine 20 is stopped.

[0057] In Figure 3, the final drive gear 7E (counter shaft 7) rotates clockwise when the vehicle moves forward, and in Figure 4, the final drive gear 7E (counter shaft 7) rotates counterclockwise when the vehicle moves forward.

[0058] As shown in Figure 4, an oil supply hole 4a is formed in the bulkhead 4A. A rib (not shown) having an oil passage (not shown) is formed at the rear of the rear case 4, and the rib extends to the propeller shaft support portion that supports the propeller shaft.

[0059] The oil stored in the curved section 2G is supplied to the propeller shaft support section through the oil passage in the rib via the oil supply hole 4a, thereby lubricating the propeller shaft with lubricating oil.

[0060] As shown in Figures 3 and 4, the containment chamber 14 is provided with a guide wall 2H, and the guide wall 2H has guide walls 3H and 4H.

[0061] Guide wall 3H is provided on the front case 3, with its front end (one end) continuous with bulkhead wall 3A. Guide wall 4H is provided on the rear case 4, with its rear end (the other end) continuous with bulkhead wall 4A.

[0062] The rear end of guide wall 3H and the front end of guide wall 4H are in contact. That is, guide wall 2H is integrally formed with partition walls 3A and 4A, respectively, and extends from partition wall 3A to partition wall 4A.

[0063] The guide wall 2H extends from below the final drive gear 7E along the outer circumference of the final drive gear 7E and is continuous with the left wall 2D.

[0064] Specifically, the guide wall 4H extends along the outer circumference of the final drive gear 7E from between the axis C1 of the counter shaft 7 and the axis C2 of the output shaft 8 in the vehicle width direction of the final drive gear 7E, and is continuous with the left side wall 4D. The guide wall 3H extends along the outer circumference of the final drive gear 7E in front of the final drive gear 7E, and is continuous with the left side wall 3D.

[0065] Of the connection points between the vertical wall section 2F and the curved section 2G, an opening 4b is formed at the connection point between the vertical wall section 4F and the curved section 4G (see Figure 4).

[0066] As shown in Figure 4, the curved section 4G has an extension section 4I. The extension section 4I extends above the final drive gear 7E from the lower end of the opening 4b so as to move away from the left wall 2D, and its rear end is continuous with the bulkhead 4A.

[0067] As shown in Figure 3, the curved portion 3G has an extension portion 3I. The front end of the extension portion 3I is continuous with the partition wall 3A, extends from the partition wall 3A to the extension portion 4I, and the rear end abuts against the extension portion 4I.

[0068] The extension 3I extends above the final drive gear 7E, in front of the opening 4b, away from the curved portion 3G and separated from the left wall 2D.

[0069] As shown in Figure 4, the tip of the extension portion 4I in the direction of extension is located at the upper end of the final drive gear 7E and between the axis C1 of the counter shaft 7 and the axis C2 of the output shaft 8 in the vertical direction.

[0070] As a result, the lubricating oil stored in the curved section 2G is supplied from the opening 4b to the extension section 4I, and then supplied to the meshing portion of the final drive gear 7E and the final driven gear 8B by the extension sections 3I and 4I, thereby lubricating the meshing portion of the final drive gear 7E and the final driven gear 8B with the lubricating oil.

[0071] Since the axial length of the counter shaft 7 in extensions 3I and 4I is formed to be more than twice the axial width of the counter shaft 7 of the final drive gear 7E, the extensions 3I and 4I can supply more lubricating oil to the meshing portion between the final drive gear 7E and the final driven gear 8B.

[0072] The state in which the rear case 4 is attached to the front case 3 and the rear end of the extension 3I is in contact with the front end of the extension 4I will be described as the extension 2I.

[0073] In this embodiment, the meshing portion of the propeller shaft, the final drive gear 7E, and the final driven gear 8B constitutes a lubrication area.

[0074] Next, the effects of the lubrication structure of the transmission 1 in this embodiment will be explained. The transmission 1 of this embodiment comprises a counter shaft 7 having a final drive gear 7E, and a transmission case 2 having a storage chamber 14 at the bottom where lubricating oil O is stored and which houses the final drive gear 7E.

[0075] The containment chamber 14 is composed of a bulkhead 3A, a bulkhead 4A facing the bulkhead 3A in the axial direction of the counter shaft 7 with the final drive gear 7E and the final driven gear 8B in between, a left side wall 2D extending in the axial direction of the counter shaft 7 and connecting the bulkhead 3A and the bulkhead 4A, and an upper wall 2B extending in the axial direction of the counter shaft 7 and connecting the bulkhead 3A and the bulkhead 4A above the counter shaft 7.

[0076] The lubrication structure of the transmission 1 in this embodiment has a collection unit 16 that collects lubricating oil scraped up to the left side wall 2D side by the rotation of the final drive gear 7E and supplies it to the lubrication area (propeller shaft, meshing portion of the final drive gear 7E and final driven gear 8B). The collection unit 16 has a vertical wall portion 2F extending from the upper wall 2B toward the counter shaft 7 and a curved portion 2G provided on the vertical wall portion 2F.

[0077] The vertical wall section 2F has its front end continuous with bulkhead 3A and its rear end continuous with bulkhead 4A. The curved section 2G bends from the lower end of the vertical wall section 2F towards the left wall 2D, then extends upward and stores lubricating oil.

[0078] This allows for the formation of a containment chamber 14 consisting of a closed space between partition wall 3A, partition wall 4A, left side wall 2D, and collection section 16.

[0079] In this embodiment, the transmission 1 has a lubrication structure configured as described above. As a result, the lubricating oil O stored at the bottom of the storage chamber 14 is scooped up by the final drive gear 7E and introduced into the storage chamber 14 from between the curved section 2G and the left side wall 2D.

[0080] The lubricating oil introduced into the containment chamber 14 moves upward along the left wall 2D, as shown by the lubricating oil O1 in Figures 3 and 4, then collides with the vertical wall 2F and falls, where it is stored in the curved section 2G. As a result, the lubricating oil O1 introduced into the containment chamber 14 is stored in the curved section 2G.

[0081] Furthermore, when the vehicle 50 is traveling at high speed, the rotational speed of the counter shaft 7 increases, and when the final drive gear 7E rotates at high speed, the lubricating oil scraped up by the final drive gear 7E is scattered in the axial direction of the counter shaft 7.

[0082] In this embodiment, the vertical wall section 2F extends from partition wall 3A to partition wall 4A. Therefore, even if the lubricating oil that has been scooped up by the final drive gear 7E and introduced into the storage chamber 14 is scattered in the axial direction of the counter shaft 7, the lubricating oil O1 can be made to collide with the vertical wall section 2F.

[0083] Therefore, it is possible to prevent the lubricating oil O1 from splashing out of the containment chamber 14 while storing more of the lubricating oil O1 introduced into the containment chamber 14 in the curved section 2G.

[0084] Thus, the lubrication structure of the transmission 1 in this embodiment can collect a large amount of lubricating oil with the collection unit 16, and can supply a large amount of lubricating oil to the lubrication parts.

[0085] Furthermore, since more lubricating oil O1 can be collected in the collection unit 16, the oil level of lubricating oil O stored at the bottom of the storage chamber 14 can be lowered, thereby reducing the stirring resistance of the final drive gear 7E.

[0086] Furthermore, according to the lubrication structure of the transmission 1 of this embodiment, a guide wall 2H is provided in the housing chamber 14, and the guide wall 2H extends from below the final drive gear 7E along the outer circumference of the final drive gear 7E and is continuous with the left side wall 2D.

[0087] As a result, even when the counter shaft 7 rotates at a low speed, such as when the vehicle 50 is traveling at a low speed, the final drive gear 7E can still scoop up the lubricating oil O along the guide wall 2H and introduce it into the storage chamber 14.

[0088] Therefore, more lubricating oil O1 can be collected by the collection unit 16, and more lubricating oil can be introduced to the lubrication parts. In addition, the oil level of lubricating oil O in the containment chamber 14 can be reduced more effectively, and the stirring resistance of the final drive gear 7E can be reduced more effectively.

[0089] Furthermore, the guide wall 2H reduces the amount of lubricating oil that the final drive gear 7E is submerged in, thus more effectively reducing the stirring resistance of the final drive gear 7E.

[0090] Here, if the collection unit 16 is located away from the axis C1 of the counter shaft 7 in the vehicle width direction, there is a risk that the lubricating oil scooped up by the final drive gear 7E may fall off due to its own weight before reaching the collection unit 16.

[0091] In the lubrication structure of the transmission 1 of this embodiment, the collection unit 16 is formed on the left side wall 2D side of the axis C1 of the counter shaft 7. Therefore, the lubricating oil scraped up by the final drive gear 7E can be reliably collected by the collection unit 16 in the initial stage, and more lubricating oil can be collected by the collection unit 16. As a result, more lubricating oil can be supplied to the lubrication parts.

[0092] Furthermore, according to the lubrication structure of the transmission 1 of this embodiment, an opening 4b is formed at the connection point between the vertical wall portion 4F and the curved portion 4G.

[0093] The curved portion 2G has an extension portion 2I, the extension portion 4I extending above the final drive gear 7E away from the left side wall 2D from the lower end of the opening 4b and supplying lubricating oil from the curved portion 4G to the final drive gear 7E through the opening 4b, and the extension portion 3I extending above the final drive gear 7E in front of the extension portion 4I away from the left side wall 2D and supplying lubricating oil from the curved portion 4G to the final drive gear 7E through the opening 4b.

[0094] This allows the lubricating oil stored in the curved section 2G to be supplied by the extended section 2I to a position away from the collection section 16. As a result, lubricating oil can be supplied to the meshing portion of the final drive gear 7E and the final driven gear 8B, allowing the meshing portion of the final drive gear 7E and the final driven gear 8B to be efficiently lubricated by the lubricating oil.

[0095] Here, when the front case 3 and rear case 4 are molded using a mold during the manufacturing of the transmission case 2, draft angles are formed in the vertical wall portion 3F and curved portion 3G, and in the vertical wall portion 4F and curved portion 4G, to facilitate the removal of the mold from the front case 3 and rear case 4.

[0096] Therefore, the thickness of the vertical wall section 3F, the curved section 3G, and the extension section 3I, and the thickness of the vertical wall section 4F, the curved section 4G, and the extension section 4I, respectively, decrease as they move away from the partition walls 3A and 4A.

[0097] As a result, the joint surfaces of extensions 3I and 4I in the axial direction of the counter shaft 7 are recessed relative to the partition walls 3A and 4A.

[0098] Therefore, by positioning the joint surfaces of the extensions 3I and 4I in the axial direction of the counter shaft 7 to face the final drive gear 7E in the vehicle width direction, the lubricating oil introduced from the curved section 2G through the opening 4b to the extension 4I can be collected at the joint surface of the extensions 3I and 4I and supplied to the final drive gear 7E along the joint surface.

[0099] Therefore, more lubricating oil can be efficiently introduced to the meshing area between the final drive gear 7E and the final driven gear 8B, and the meshing area between the final drive gear 7E and the final driven gear 8B can be lubricated even more efficiently.

[0100] While embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that modifications can be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims. [Explanation of symbols]

[0101] 1...Transmission (vehicle transmission), 2...Transmission case, 2B...Upper wall, 2C...Lower wall, 2D...Left side wall (side wall), 2F...Vertical wall section, 2G...Curved section, 2H...Guide wall, 2I...Extension section, 3A...Bulkhead (first vertical wall), 4A...Bulkhead (second vertical wall), 4b...Opening, 7...Counter shaft (rotating shaft), 7E...Final drive gear (gear), 14...Housing chamber, 16...Collection section, C1...Axis center (axis center of the rotating shaft)

Claims

1. A counter shaft having a final drive gear, and an output shaft having a final driven gear that meshes with the final drive gear, The transmission case has a compartment at the bottom where lubricating oil is stored and which houses the counter shaft and the output shaft. The housing chamber is configured to include a first vertical wall, a second vertical wall facing the first vertical wall in the axial direction of the counter shaft with the final drive gear in between, a left wall extending in the axial direction of the counter shaft and connecting the first vertical wall and the second vertical wall to the left of the counter shaft, a right wall connecting the first vertical wall and the second vertical wall to the right of the counter shaft, an upper wall extending in the axial direction of the counter shaft and connecting the first vertical wall, the second vertical wall, the left wall and the right wall above the counter shaft, and a lower wall extending in the axial direction of the counter shaft and connecting the first vertical wall, the second vertical wall, the left wall and the right wall below the counter shaft. The right side wall is inclined so as it moves from top to bottom, it approaches the left side wall. The output shaft is positioned diagonally above and to the right of the counter shaft, and is located closer to the right wall than the left wall. The lubrication structure for a vehicle transmission, wherein the counter shaft is located on the left side of the right side of the wall, It has a collection unit that collects the lubricating oil scraped up to the left side wall side by the rotation of the final drive gear and supplies it to the lubrication area. The collection unit has a vertical wall portion extending from the upper wall toward the counter axis and a curved portion provided on the vertical wall portion. The aforementioned vertical wall portion has one end that is continuous with the first vertical wall and the other end that is continuous with the second vertical wall. The curved portion bends from the lower end of the vertical wall towards the left wall and then extends upward. The lubrication structure for a vehicle transmission is characterized in that the collection portion is formed on the left side wall side of the axis of the counter shaft.

2. Guide walls are provided in the aforementioned containment chamber. The lubrication structure for a vehicle transmission according to claim 1, characterized in that the guide wall extends from below the final drive gear along the outer circumference of the final drive gear and is continuous with the left side wall.

3. An opening is formed at the connecting portion between the vertical wall portion and the curved portion, The curved portion has an extended portion, The lubrication structure for a vehicle transmission according to claim 1 or 2, characterized in that the extension extends above the final drive gear from the lower end of the opening so as to move away from the left side wall, and lubricating oil is supplied to the final drive gear from the curved portion through the opening.

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