JP2018076879A - Vehicle transmission - Google Patents

Abstract

An object of the present invention is to provide a vehicular transmission capable of easily increasing the rigidity of a bearing portion while preventing air suction of an oil pump. In a transmission 2, a bearing portion 33 that rotatably supports a differential case 11 and a ring gear 10 and a first rib 21 are formed on a side wall 5A. The first rib 21 is formed with an oil strainer 13. Further, it protrudes from the side wall 5A toward the side wall 4A. The first rib 21 extends in a predetermined direction along the side wall 4 </ b> A from the bearing portion 33, and the predetermined direction is substantially parallel to the directions of loads Pf and Pr applied to the bearing portion 33 from the ring gear 10 through the differential case 11. is there. [Selection] Figure 3

Description

  The present invention relates to a vehicle transmission.

  A transmission mounted on a vehicle such as an automobile includes an oil pump that sucks oil through an oil strainer. By the way, when the vehicle turns or the like, oil is biased in one direction in the oil reservoir, so that the oil level is lowered. As a result, so-called air suction occurs, in which the oil pump sucks air, and the pressure of the oil discharged from the oil pump may be temporarily reduced.

  2. Description of the Related Art Conventionally, for example, a power transmission device described in Patent Document 1 is known as a device that can suppress air suction of an oil pump. The power transmission device includes a transmission mechanism, a transmission mechanism housing chamber that houses the transmission mechanism, a transmission case that includes a hydraulic oil reservoir that extends downward on the side of the transmission mechanism housing chamber, and a hydraulic oil reservoir. A strainer that is disposed and has a hydraulic oil suction port at a lower portion thereof, and an oil pump that sucks the hydraulic oil from the hydraulic oil reservoir through the strainer.

A rib that protrudes toward the strainer and faces the upper portion of the strainer via a gap is formed on the wall portion of the hydraulic oil reservoir.
In this power transmission device, the oil level in the hydraulic oil reservoir is lowered by blocking the hydraulic oil that is about to flow from the hydraulic oil reservoir into the lateral transmission mechanism housing chamber when the vehicle is turning, by a rib. To prevent that.

JP 2014-20476 A

  In such a conventional power transmission device, for example, when a hydraulic oil reservoir is provided near the bearing that supports the differential shaft as the rotating member, a rib or the like for ensuring the rigidity of the bearing The installation area must be reduced. For this reason, there exists a possibility that the rigidity of a bearing part may fall.

  The present invention has been made paying attention to the above-described problems, and provides a vehicle transmission that can easily increase the rigidity of a bearing portion while preventing air suction of an oil pump. It is intended to provide.

  The present invention has one side wall, the other side wall facing the one side wall, and a bottom wall connecting the one side wall and the lower end of the other side wall, and an oil storage part for storing oil is provided at the bottom part. A transmission case provided, a first bearing formed on the one side wall and rotatably supporting the first rotating member, and positioned closer to the oil reservoir than the first rotating member The second bearing portion that is formed on the one side wall and rotatably supports the second rotating member, the oil strainer that is housed in the transmission case and is immersed in the oil in the oil storage portion, and the speed change A vehicle transmission comprising an oil pump housed in a machine case and sucking oil through the oil strainer, wherein a rib is formed on the one side wall, and the rib is higher than the oil strainer. The rib protrudes from the one side wall toward the other side wall, and the rib extends in a predetermined direction along the one side wall from the second bearing portion, and the predetermined direction is the rotation shaft. To the direction of the load applied to the second bearing portion.

  As described above, according to the present invention, it is possible to easily increase the rigidity of the bearing portion while preventing air suction of the oil pump.

FIG. 1 is a front view of a vehicle transmission according to an embodiment of the present invention. FIG. 2 is a side view of a left case of a vehicle transmission according to an embodiment of the present invention, showing a state in which a speed change mechanism and a differential device are attached. FIG. 3 is a side view of a left case of a vehicle transmission according to an embodiment of the present invention, showing a state in which a speed change mechanism and a differential device are removed. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along arrow VV in FIG.

A vehicle transmission according to an embodiment of the present invention has one side wall, the other side wall facing the one side wall, and a bottom wall connecting the one side wall and the lower end of the other side wall, and oil is stored. A transmission case having an oil storage portion provided at the bottom, a first bearing portion that is formed on one side wall and rotatably supports the first rotating member, and stores oil more than the first rotating member. A second bearing part that is formed on one side wall so as to be positioned on the part side and rotatably supports the second rotating member; an oil strainer that is housed in the transmission case and is immersed in the oil in the oil storage part; A transmission for a vehicle including an oil pump housed in a transmission case and sucking oil through an oil strainer, wherein a rib is formed on one side wall, and the rib is disposed on one side wall above the oil strainer. From And the rib extends in a predetermined direction along one side wall from the second bearing portion, and the predetermined direction is a load applied to the second bearing portion from the second rotating member. It is substantially parallel to the direction.
Thereby, the rigidity of the bearing portion can be easily increased while preventing air suction of the oil pump.

  Embodiments of a vehicle transmission according to the present invention will be described below with reference to the drawings.

  1 to 5 are views showing a vehicle transmission according to an embodiment of the present invention. In FIGS. 1 to 5, the direction indicated by any one of up, down, front, back, left, and right indicates a direction viewed from the driver on the vehicle.

First, the configuration will be described.
In FIG. 1, an engine room (not shown) of a vehicle is provided with an engine 1 as an internal combustion engine and a transmission 2 connected to the engine 1. The power of the engine 1 is transmitted from the transmission 2 to left and right drive wheels (not shown) via a drive shaft (not shown).

  The transmission 2 includes a transmission case 3, and the transmission case 3 includes a right case 4 and a left case 5. The left case 5 is provided with a fastening surface 5a to be joined to the right case 4. As shown in FIG. 3, the fastening surface 5a is provided with bolt insertion holes 5b having a number of edges into which bolts (not shown) are inserted. ing.

  The right case 4 is provided with a fastening surface 4a (see FIG. 1) joined to the left case 5. The fastening surface 4a is provided with a bolt insertion groove (not shown) to which a bolt (not shown) is fastened. Fastening surfaces 4 a and 5 a are fastened to the right case 4 and the left case 5 by fastening bolts to the bolt insertion holes of the right case 4 through the bolt insertion holes 5 b of the left case 5. Thereby, the rigidity of fastening surface 4a, 5a becomes large.

A clutch (not shown) is housed inside the light case 4. A transmission mechanism 6 and a differential device 7 (see FIG. 2) are housed inside the left case 5.
The transmission 2 inputs the power of the engine 1 to the transmission mechanism 6 through a clutch, performs a shift in the transmission mechanism 6 by operating a shifter shaft (not shown), and transmits the shifted rotation to the drive shaft by the differential device 7. To do.

  In FIG. 2, the speed change mechanism 6 includes an input shaft 8 and a counter shaft 9. The input shaft 8 includes a plurality of input gears 8 </ b> A, and power is transmitted from the engine 1 to the input shaft 8.

The counter shaft 9 includes a plurality of counter gears 9A, and the counter gears 9A are meshed with input gears 8A corresponding to the respective shift stages.
The counter shaft 9 is provided with a final drive gear (not shown), and the final drive gear meshes with the ring gear 10 of the differential device 7.

  The differential device 7 includes a differential case 11 to which a ring gear 10 is fixed, a pinion shaft (not shown), a pair of pinion gears (not shown) that are rotatably supported by the pinion shafts, and a pair of side gears (not shown) that mesh with the pinion gears. Yes.

  The side gear is connected to the left and right drive shafts. The ring gear 10 meshes with the final drive gear of the counter shaft 9. The differential device 7 transmits the rotation of the ring gear 10 to drive wheels (not shown) via the left and right drive shafts while allowing the differential of the left and right drive shafts.

  In FIG. 1, the lower end of the side wall 4 </ b> A and the lower end of the side wall 5 </ b> A are connected by bottom walls 4 </ b> B and 5 </ b> B, and the bottom walls 4 </ b> B and 5 </ b> B constitute the bottom wall 3 </ b> A of the transmission case 3. An oil reservoir 15 is formed at the bottom of the transmission case 3, and the oil reservoir 15 stores oil O (see FIGS. 2 and 3).

  The oil reservoir 15 is a portion that accommodates the oil O surrounded by the side walls 4A, 5A and the bottom walls 4B, 5B at the bottom of the transmission case 3. The oil O is stored in an amount corresponding to the volume of the oil storage unit 15.

  In FIG. 2, the lower portion of the ring gear 10 is immersed in the oil O, and the oil O is scraped up by the rotation of the ring gear 10. The side wall 5A of this embodiment constitutes one side wall of the transmission case of the present invention, and the side wall 4A constitutes the other side wall of the transmission case of the present invention.

  One end portion of the input shaft 8 is rotatably supported by a bearing portion (not shown) formed on the inner peripheral surface of the side wall 4A of the light case 4 via a bearing (not shown). The other end of the input shaft 8 is rotatably supported by an annular bearing 31 (see FIG. 3) formed on the inner peripheral surface of the side wall 5A of the left case 5 via a bearing (not shown).

  One end portion of the counter shaft 9 is rotatably supported by a bearing portion (not shown) formed on the inner peripheral surface of the side wall 4A of the light case 4 via a bearing (not shown). The other end portion of the counter shaft 9 is rotatably supported by an annular bearing portion 32 (see FIG. 3) formed on the inner peripheral surface of the side wall 5A of the left case 5 via a bearing (not shown).

One end of the differential case 11 is rotatably supported by a bearing (not shown) formed on the inner peripheral surface of the side wall 4A of the light case 4 via a bearing (not shown). The other end of the differential case 11 is rotatably supported by an annular bearing portion 33 (see FIG. 3) formed on the inner peripheral surface of the side wall 5A of the left case 5 via a bearing (not shown).
The bearing portion 33 is formed on the oil storage portion 15 side below the bearing portions 31 and 32, in other words, on the oil surface side of the oil O, and is closer to the oil storage portion 15 than the bearing portions 31 and 32. doing.

  The input shaft 8 of the present embodiment constitutes the first rotating member of the present invention, and the ring gear 10 and the differential case 11 constitute the second rotating member of the present invention. The bearing portion 31 constitutes the first bearing portion of the present invention, and the bearing portion 33 constitutes the second rotating member of the present invention.

  In FIG. 3, an oil introduction hole 33 </ b> A is formed in the bearing portion 33. When the vehicle moves forward, the ring gear 10 rotates in the clockwise direction R (see FIG. 2). When the oil O is picked up by the rotation of the ring gear 10, a part of the picked up oil O1 is introduced into the bearing that supports the differential case 11 through the oil introduction hole 33A. Thereby, the bearing is lubricated.

  The oil O1 scraped up by the rotation of the ring gear 10 is supplied to the meshing portion between the input gear 8A and the counter gear 9A, whereby the meshing portion between the input gear 8A and the counter gear 9A is lubricated.

In FIG. 2, an oil strainer 13 and an oil pump 14 are accommodated in the transmission case 3. The oil strainer 13 includes a filter element (not shown) that removes foreign matters such as iron powder from the oil, and is immersed in the oil O of the oil reservoir 15.
The oil pump 14 sucks the purified oil through the oil strainer 13, and supplies the sucked oil to a hydraulic device (not shown) and a lubrication part through an oil passage (not shown).

  A first rib 21 is formed on the side wall 5 </ b> A of the left case 5. The first rib 21 protrudes from the side wall 5A of the left case 5 toward the side wall 4A of the right case 4 above the oil strainer 13 (see FIG. 4). The 1st rib 21 of this Embodiment comprises the rib of this invention.

  In FIG. 4, the first rib 21 has a curved portion 21a whose central portion is curved in an arc shape toward the side wall 5A. That is, the first rib 21 is formed such that the width H2 of the central portion in the front-rear direction is shorter than the width H1 of the front side and the rear side of the vehicle.

  In the transmission case 3, the space above the transmission case 3 and the oil reservoir 15 are connected through the curved portion 21a, and the oil pump 14 is installed in the space surrounded by the curved portion 21a.

  3 and 4, the first rib 21 extends from the bearing portion 33 along the side wall 5 </ b> A of the left case 5 to the front wall 5 </ b> C of the left case 5. The extending direction of the first rib 21 corresponds to a predetermined direction of the present invention, and this predetermined direction is a direction of a load applied to the bearing portion 33 from the ring gear 10 through the differential case 11 due to the meshing of the ring gear 10 and the counter shaft 9. Is substantially parallel to the direction.

  As shown in FIG. 3, when the vehicle moves forward, a load Pf is applied to the bearing portion 33 diagonally forward and downward from the rotation center shaft 10 </ b> A of the ring gear 10. Further, when the vehicle is moving backward, a load Pr is applied to the bearing portion 33 from the rotation center shaft 10A of the ring gear 10 to the rear in the horizontal direction. The loads Pf and Pr are obtained by combining the meshing forces of the counter gear 9A and the ring gear 10 when the vehicle is moving forward and when the vehicle is moving backward.

  The first rib 21 includes a first rib portion 21A extending substantially parallel to the direction of the load Pf applied to the bearing portion 33 from the ring gear 10 through the differential case 11 when the vehicle moves forward, and the differential gear case 11 from the ring gear 10 when the vehicle moves backward. And a second rib portion 21 </ b> B extending substantially parallel to the direction of the load Pr applied to the bearing portion 33.

  21 A of 1st rib parts are extended toward the bottom wall 5B from the bearing part 33 in the front-back direction of a vehicle orthogonal to 10 A of rotation center axes of the ring gear 10. As shown in FIG. The second rib portion 21B extends substantially parallel to the bottom wall 5B from the first rib portion 21A in the vehicle front-rear direction perpendicular to the rotation center axis 10A of the ring gear 10.

  Second ribs 22 </ b> A and 22 </ b> B are formed on the side wall 5 </ b> A of the left case 5. The second ribs 22A and 22B protrude from the side wall 5A toward the side wall 4A of the light case 4, extend radially from the bearing portion 31, and are connected to the fastening surface 5a of the bottom wall 5B. The second ribs 22A and 22B intersect with the first rib 21, and the first rib 21 and the second ribs 22A and 22B are formed in a substantially cross shape when viewed from the side of the vehicle. .

  A third rib 23 is formed on the left case 5. In FIG. 5, the third rib 23 protrudes from the side wall 5 </ b> A toward the side wall 4 </ b> A by a width H <b> 3 and connects the bearing portion 31 and the bearing portion 33.

In FIG. 3, a part 23 </ b> A of the third rib 23 is formed substantially parallel to the second rib part 21 </ b> B that is a part of the first rib 21. Thereby, a part 23A of the third rib 23 extends in the same direction as the direction of the load Pr.
A fourth rib 24 is formed on the side wall 5A. The fourth rib 24 connects the first rib portion 21A, the bearing portion 33, and the bottom wall 5B.

Next, the operation will be described.
When the oil reservoir 15 is provided in the transmission case 3, it is necessary to store a certain amount of oil necessary for lubricating the transmission 2 at the bottom of the transmission case 3. Thereby, the oil storage part 15 may be provided in the bearing part 33 of the differential apparatus 7 installed in the lower part of the transmission case 3.

  In this case, the rigidity of the bearing portion 33 is ensured by, for example, forming the curved portion 21a in the first rib 21 in order to secure a space for providing the oil storage portion 15 (a space for filling the oil O). Therefore, the installation area of the first rib 21 must be reduced. Thereby, the rigidity of the bearing part 33 may fall.

  According to the transmission 2 of the present embodiment, the first rib 21 extends in a predetermined direction from the bearing portion 33 along the side wall 5 </ b> A, and the predetermined direction extends from the ring gear 10 through the differential case 11 to the bearing portion 33. Is substantially parallel to the directions of the loads Pf and Pr applied to.

  Thereby, the rigidity of the bearing part 33 can be easily improved by the 1st rib 21, and it can suppress that the bearing part 33 deform | transforms in the front-back direction of a vehicle. Further, the load Pf, Pr applied to the bearing portion 33 can be received by the front wall 5C of the left case 5 from the first rib 21 extending in the same direction as the loads Pf, Pr, and can be released to the fastening surface 5a having high rigidity. The rigidity of the bearing part 33 can be improved more effectively.

  In particular, the first rib 21 extends from the ring gear 10 through the differential case 11 through the differential case 11 when the vehicle advances, and the first rib portion 21A extends substantially parallel to the direction of the load Pf. The second rib portion 21 </ b> B extending substantially parallel to the direction of the load Pr applied to the bearing portion 33 is included.

  Further, the first rib portion 21 </ b> A extends from the bearing portion 33 toward the bottom wall 5 </ b> B in the vehicle front-rear direction orthogonal to the rotation center axis 10 </ b> A of the ring gear 10, and the second rib portion 21 </ b> B extends from the ring gear 10. The vehicle extends substantially in parallel with the bottom wall 5B from the first rib portion 21A in the longitudinal direction of the vehicle orthogonal to the rotation center axis 10A.

Accordingly, it is possible to more effectively suppress the bearing portion 33 from being deformed in the front-rear direction of the vehicle with respect to the loads Pf and Pr applied to the bearing portion 33 from the ring gear 10 through the differential case 11 when the vehicle moves forward and backward.
Moreover, since the 1st rib 21 has the curved part 21a, it can suppress that stress concentrates on the 1st rib 21, and can suppress more effectively that the bearing part 33 deform | transforms in the front-back direction of a vehicle.

On the other hand, when the vehicle turns, the oil stored in the oil storage unit 15 is biased in one direction, and the oil pump 14 may suck air through the oil strainer 13.
On the other hand, in the transmission 2 of the present embodiment, the first rib 21 is formed on the side wall 5A, and the first rib 21 extends from the side wall 5A to the side wall 4A above the oil strainer 13. Protruding.

Thereby, the oil O which tends to be biased to one side by turning of the vehicle or the like and collides with the first rib 21 can collide with the first rib 21, and the oil level of the oil O below the oil strainer 13 is lowered. Can be prevented. For this reason, it is possible to prevent the oil pump 14 from sucking air.
As described above, the transmission 2 of the present embodiment can easily increase the rigidity of the bearing portion 33 while preventing the air suction of the oil pump 14 from occurring.

  Further, according to the transmission 2 of the present embodiment, the second ribs 22A and 22B are formed on the side wall 5A, and the second ribs 22A and 22B protrude from the side wall 5A toward the side wall 4A, and It extends radially from the portion 31 and is connected to the fastening surface 5a. In addition to this, the second ribs 22 </ b> A and 22 </ b> B intersect the first rib 21.

  Accordingly, the first rib 21 can be reinforced by the high-rigidity second ribs 22A and 22B connected to the rigid bearing portion 31 and the fastening surface 5a, respectively, and the rigidity of the bearing portion 33 is reduced to the first. The rib 21 can be improved more effectively, and the bearing portion 33 can be more effectively suppressed from being deformed in the longitudinal direction of the vehicle.

  Further, according to the transmission 2 of the present embodiment, the third rib 23 is formed on the side wall 5A, and the third rib 23 protrudes from the side wall 5A toward the side wall 4A, and the bearing portion 31 and the bearing The part 33 is connected. In addition, a part 23A of the third rib 23 is formed substantially in parallel with the second rib portion 21B.

  Thereby, the loads Pf and Pr applied to the bearing portion 33 from the ring gear 10 through the differential case 11 can be received by the first rib 21 and the third rib 23, and the rigidity of the bearing portion 33 is more effectively improved. Can be made.

  In particular, the portion 23A of the third rib 23 extends substantially in parallel with the direction of the load Pr applied to the bearing portion 33 from the rotating shaft when the vehicle moves backward, so that the load Pr is applied by the first rib 21 and the third rib 23. The rigidity of the bearing portion 33 when received can be improved more effectively. Thereby, it can suppress more effectively that the bearing part 33 deform | transforms in the front-back direction of a vehicle.

  Further, according to the transmission 2 of the present embodiment, the fourth rib 24 is formed on the side wall 5A, and the fourth rib 24 includes the first rib portion 21A, the bearing portion 33, and the bottom wall 5B. Are linked. Accordingly, the first rib 21 can be reinforced by the fourth rib 24, and the rigidity of the bearing portion 33 can be improved more effectively by the first rib 21. As a result, it can suppress more effectively that the bearing part 33 deform | transforms in the front-back direction of a vehicle.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  2. Transmission, 3 ... Transmission case, 3A ... Bottom wall, 4A ... Side wall (the other side wall), 5A ... Side wall (one side wall), 5a ... Fastening surface , 8 ... input shaft (first rotating member), 10 ... ring gear (second rotating member), 10A ... rotation center axis (rotation center axis of second rotation member), 11. Differential case (at the second rotation), 13 ... Oil strainer, 14 ... Oil pump, 15 ... Oil reservoir, 21 ... First rib (rib), 21A ... First 21B ... the second rib part, 22A, 22B ... the second rib, 23 ... the third rib, 23A ... a part of the third rib, 31 ... Bearing part (first bearing part), 33 ... bearing part (second bearing part)

Claims (5)

A shift having one side wall, the other side wall facing the one side wall, and a bottom wall connecting the one side wall and the lower end of the other side wall, and an oil storage part for storing oil is provided at the bottom part Machine case,
A first bearing portion formed on the one side wall and rotatably supporting the first rotating member;
A second bearing portion that is formed on the one side wall so as to be positioned closer to the oil reservoir than the first rotating member, and rotatably supports the second rotating member;
An oil strainer housed in the transmission case and immersed in the oil in the oil reservoir;
A vehicle transmission comprising an oil pump housed in the transmission case and sucking oil through the oil strainer;
Ribs are formed on the one side wall, and the rib protrudes from the one side wall toward the other side wall above the oil strainer,
The rib extends in a predetermined direction along the one side wall from the second bearing portion,
The vehicle transmission according to claim 1, wherein the predetermined direction is substantially parallel to a direction of a load applied from the second rotating member to the second bearing portion.   The rib includes a first rib portion extending substantially parallel to a direction of a load applied from the second rotating member to the second bearing portion when the vehicle moves forward, and a second rib portion extending from the second rotating member when the vehicle moves backward. The vehicle transmission according to claim 1, further comprising a second rib portion extending substantially parallel to a direction of a load applied to the bearing portion. The first rib portion extends from the second bearing portion toward the bottom wall in a direction orthogonal to the rotation center axis of the second rotating member,
3. The second rib portion according to claim 2, wherein the second rib portion extends substantially parallel to the bottom wall from the first rib portion in a direction orthogonal to a rotation center axis of the second rotating member. Vehicle transmission. The one side wall has a fastening surface fastened to the other side wall;
When the rib is a first rib, a second rib is formed on the one side wall,
The second rib protrudes from the one side wall toward the other side wall, extends radially from the first bearing portion, and is connected to the fastening surface;
The vehicle transmission according to any one of claims 1 to 3, wherein the second rib intersects the first rib. When the rib is a first rib, a third rib is formed on the one side wall,
The third rib protrudes from the one side wall toward the other side wall, and connects the first bearing portion and the second bearing portion,
The vehicle transmission according to any one of claims 1 to 4, wherein a part of the third rib is formed substantially parallel to a part of the first rib. .

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