JP2015140865A - automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic transmission capable of suppressing an increase in the radial dimensions of the automatic transmission while arranging an oil reservoir in an outer circumferential portion of the automatic transmission.SOLUTION: An automatic transmission (6) comprises: an input shaft (14) to which power generated by an engine (2) is input; a plurality of stages of a planetary gear set (44) configured by arranging a plurality of planetary gear sets (38, 40) around the input shaft (14) to be superimposed on inner and outer circumferences; clutches (18, 20, 22) transmitting the power input to the input shaft (14) to the planetary gear set (44); and an oil reservoir (54) storing a working fluid supplied to or discharged from centrifugal cancellation chambers of the respective clutches (18, 20, 22), the oil reservoir (54) being arranged at a position offset from the plurality of stages of planetary gear set (44) along an extension direction of the input shaft (14).

Description

  The present invention relates to an automatic transmission, and more particularly, to an automatic transmission that shifts power generated by a power source and outputs it to a differential mechanism.

  2. Description of the Related Art Conventionally, an automatic transmission that shifts the power generated by an engine and outputs it to a differential mechanism is known. The automatic transmission includes an input shaft to which power generated by the engine is input via a fluid transmission device, a plurality of planetary gear sets for increasing and decreasing the speed of power input to the input shaft, and A clutch for connecting / disconnecting the input shaft to the rotating element included in the planetary gear set, and a brake for fixing the rotating element. By selectively engaging and controlling the clutch and the brake, a plurality of forward shift speeds and reverse gears are provided. The gear stage is realized.

  The clutch includes a friction plate that frictionally fastens the input shaft and the rotating element, a fastening piston that presses the friction plate in the axial direction of the input shaft, and a fastening that is supplied with hydraulic pressure (hydraulic oil) for pressing the fastening piston. It has a hydraulic chamber. Since the engagement hydraulic chamber of the clutch rotates around the input shaft, a centrifugal pressure is generated in the hydraulic oil supplied to the engagement hydraulic chamber. Due to the centrifugal pressure, the fastening piston presses the friction plate in the fastening direction, and the clutch may be erroneously fastened. Therefore, in order to prevent erroneous engagement of the clutch due to centrifugal pressure, a centrifugal cancel chamber is provided on the opposite side of the fastening hydraulic chamber with respect to the fastening piston in the direction in which the input shaft extends (see, for example, Patent Document 1). .

  However, since the hydraulic oil must be constantly supplied to the centrifugal cancel chamber as described above using an oil pump driven by an engine or a motor, it causes a deterioration in fuel consumption. Therefore, an oil reservoir connected to the centrifugal cancel chamber is arranged above the clutch, and when hydraulic oil is required in the centrifugal cancel chamber, the hydraulic oil stored in the oil reservoir is supplied to the centrifugal cancel chamber. And when hydraulic fluid should be discharged | emitted from a centrifugal cancellation chamber, the hydraulic fluid discharged | emitted from the centrifugal cancellation chamber is also stored in an oil storage part (for example, refer patent document 2).

JP 2010-048318 A JP 2006-162061 A

  By the way, in recent years, the number of planetary gear sets may be increased in response to a request for multistage automatic transmissions. In this case, if the additional planetary gear sets are arranged along the direction in which the input shaft extends, the axial dimension of the automatic transmission increases. Therefore, it is conceivable to suppress an increase in the axial dimension of the automatic transmission by arranging a plurality of planetary gear sets on the inner and outer circumferences.

  However, in the case where a multi-stage planetary gear set in which a plurality of planetary gear sets are arranged on the inner and outer circumferences is provided in an automatic transmission, in order to suppress an increase in the axial dimension of the automatic transmission, an oil storage If the portion is disposed not on the axial end portion of the automatic transmission but on the outer peripheral portion of the multi-stage planetary gear set, there is a problem that the radial dimension of the automatic transmission increases.

  The present invention has been made to solve the above-described problems of the prior art, and suppresses an increase in the radial dimension of the automatic transmission while disposing an oil reservoir on the outer periphery of the automatic transmission. It is an object of the present invention to provide an automatic transmission that can be used.

In order to achieve the above object, an automatic transmission according to the present invention is an automatic transmission that shifts and outputs power generated by a power source, and is an input shaft to which power generated by the power source is input. And one or a plurality of multi-stage planetary gear sets configured by placing at least two planetary gear sets on the inner and outer circumferences around the input shaft, and the power input from the power source to the input shaft to the planetary gear set. One or a plurality of clutches for transmission, a fastening hydraulic chamber to which hydraulic oil is supplied, a fastening piston that moves by receiving hydraulic pressure from the hydraulic oil, and a fastening piston along a direction in which the input shaft extends A clutch having a centrifugal cancel chamber provided on the opposite side of the fastening hydraulic chamber, and is supplied to the centrifugal cancel chamber of the clutch via an oil passage or from the centrifugal cancel chamber via an oil passage. Anda oil reservoir portion that stores hydraulic oil discharged Te, oil reservoir, characterized in that along the direction in which the input shaft extends is arranged at a position offset from the plurality of stages planetary gear set.
In the present invention configured as described above, the oil reservoir is disposed at a position offset from the multi-stage planetary gear set along the direction in which the input shaft extends. The oil storage part can be arranged on the inner peripheral side than the case where it is arranged on the outer peripheral part of the multi-stage planetary gear set, so that the oil storage part is prevented from increasing in the axial dimension of the automatic transmission. The increase in the radial dimension of the automatic transmission can also be suppressed.

In the present invention, it is preferable that the automatic transmission further includes one or more planetary gear sets arranged around the input shaft, and the oil reservoir is an outer peripheral portion of the one or more planetary gear sets. Is arranged.
In the present invention configured as described above, the oil storage portion is disposed on the outer peripheral portion of the planetary gear set having a smaller radial dimension than the multi-stage planetary gear set, and thus suppresses an increase in the axial dimension of the automatic transmission. Therefore, an increase in the radial dimension of the automatic transmission can be suppressed while disposing the oil storage part on the outer peripheral part of the automatic transmission.

In the present invention, preferably, the automatic transmission is further arranged on an outer peripheral portion of the planetary gear set, and is either a sun gear, a carrier, or a ring gear of the multi-stage planetary gear set and / or one or more planetary gear sets. A brake for limiting the operation is provided, and the oil reservoir is disposed on an outer peripheral portion of one or more planetary gear sets where the brake is not disposed.
In the present invention configured as described above, the oil reservoir is disposed on the outer peripheral portion of one or more planetary gear sets where no brake is disposed. Therefore, the brake is disposed at the position of the oil reservoir. The oil storage portion can be located on the inner peripheral side compared to the case where the oil storage portion is disposed on the outer peripheral portion of the planetary gear set, so that the oil storage portion is connected to the automatic transmission in order to suppress an increase in the axial dimension of the automatic transmission. The increase in the radial dimension of the automatic transmission can be suppressed while being disposed on the outer peripheral portion of the automatic transmission.

In the present invention, it is preferable that the automatic transmission further includes an output unit that outputs power from the multi-stage planetary gear set and / or one or more planetary gear sets, and the output unit includes one or more planetary gears. Arranged adjacent to the set, the oil reservoir is disposed on the outer periphery of one or more planetary gear sets and on the outer periphery of the output unit.
In the present invention configured as described above, the oil storage portion is disposed at the outer peripheral portion of the planetary gear set and the outer peripheral portion of the output portion having a smaller radial dimension than the multi-stage planetary gear set. In order to suppress the increase in size, the oil storage portion can be disposed on the outer peripheral portion of the automatic transmission, and the increase in the radial dimension of the automatic transmission can be suppressed, and the volume of the oil storage portion can be increased. be able to.

In the present invention, preferably, the automatic transmission further includes one or more planetary gear sets arranged around the input shaft, and one or more planetary gear sets and / or a sun gear of a multi-stage planetary gear set, A brake that restricts the operation of either the carrier or the ring gear, and the brake and the oil reservoir are offset from each other along the direction in which the input shaft extends in the outer periphery of one or more planetary gear sets. Are arranged.
In the present invention configured as described above, the brake and the oil storage portion are arranged offset from each other along the direction in which the input shaft extends in the outer peripheral portion of one or more planetary gear sets. Even when a brake is provided on the outer periphery of the planetary gear set that has a smaller radial dimension than that of the planetary gear set, the oil reservoir can be arranged on the outer periphery of the planetary gear set. An increase in the radial dimension of the automatic transmission can be suppressed while disposing the oil reservoir on the outer periphery of the automatic transmission in order to suppress the increase in dimensions.

  According to the automatic transmission according to the present invention, it is possible to suppress an increase in the radial dimension of the automatic transmission while disposing the oil storage portion on the outer peripheral portion of the automatic transmission.

It is the skeleton figure which looked at the horizontal section which passes along the central axis of the automatic transmission by a 1st embodiment of the present invention from the upper part. It is the II-II arrow line view of the automatic transmission by 1st Embodiment of this invention shown in FIG. 2 is a fastening table of the automatic transmission according to the first embodiment of the present invention shown in FIG. FIG. 4 is an IV-IV arrow view of the automatic transmission according to the first embodiment of the present invention shown in FIG. 1. It is the skeleton figure which looked at the horizontal section which passes along the central axis of the automatic transmission by a 2nd embodiment of the present invention from the upper part. It is the skeleton figure which looked at the horizontal section which passes along the central axis of the automatic transmission by a 3rd embodiment of the present invention from the upper part. It is the skeleton figure which looked at the horizontal section which passes along the central axis of the automatic transmission by a 4th embodiment of the present invention from the upper part. FIG. 8 is a fastening table of an automatic transmission according to a fourth embodiment of the present invention shown in FIG. 7. It is the skeleton figure which looked at the horizontal section which passes along the central axis of the automatic transmission by a 5th embodiment of the present invention from the upper part.

Hereinafter, an automatic transmission according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, an overall configuration of a powertrain structure to which the automatic transmission according to the first embodiment of the present invention is applied will be described with reference to FIGS. FIG. 1 is a skeleton diagram showing a horizontal cross section passing through the central axis of the automatic transmission according to the first embodiment of the present invention as viewed from above, and FIG. 2 is an automatic diagram according to the first embodiment of the present invention shown in FIG. FIG. 3 is an II-II arrow view of the transmission, and FIG. 3 is a fastening table of the automatic transmission according to the first embodiment of the present invention shown in FIG.

First, in FIG. 1, the code | symbol 1 has shown the powertrain structure. This powertrain structure 1 is applied to a front-wheel drive vehicle (FF vehicle) in which an engine 2 is mounted horizontally on the front portion of the vehicle. An arrow FR in FIG. 1 indicates the traveling direction of the FF vehicle to which the powertrain structure 1 is applied.
An automatic transmission 8 is connected to the output shaft 4 of the engine 2 which is a power source of the vehicle via a torque converter 6. A counter mechanism 10 is connected to the output side of the automatic transmission 8, and the differential mechanism 12 is driven by power output from the automatic transmission 8 via the counter mechanism 10.

The automatic transmission 8 includes an input shaft 14 to which power generated by the engine 2 is input via the torque converter 6, and a transmission mechanism 16 is disposed around the input shaft 14.
The automatic transmission 8 includes a first clutch 18, a second clutch 20, and a third clutch 22 that transmit power input from the output shaft 4 of the engine 2 to the input shaft 14 of the automatic transmission 8 to the transmission mechanism 16. I have. The second clutch 20 transmits the power input to the input shaft 14 to the transmission mechanism 16, the first clutch 18 and the third clutch 22. The first clutch 18 and the third clutch 22 transmit the power input from the second clutch 20 to the transmission mechanism 16. In addition, the automatic transmission 8 includes a first brake 24 and a second brake 26 that limit the operation of a rotating element included in the transmission mechanism 16.
Further, an output gear 28 that outputs power from the transmission mechanism 16 is disposed between the transmission mechanism 16 and the second clutch 20.

  The input shaft 14, the transmission mechanism 16, the clutches 18, 20 and 22, the brakes 24 and 26, and the output gear 28 are stored in the transmission case 30. The transmission case 30 includes a case portion 32 formed around the input shaft 14, the transmission mechanism 16, the clutches 18, 20 and 22, the brakes 24 and 26, and the output gear 28, and the case portion 32 on the engine 2 side. And a housing portion 34 attached to the end surface of the housing. The case portion 32 includes a case portion main body 32 a that forms the outer periphery of the case portion 32, a partition wall 32 b that partitions the case portion 32 and the housing portion 34 on an end surface of the case portion 32 on the engine 2 side, and an engine of the case portion 32. 2 and an end cover 32c that forms an end face on the side far from the end face. The housing part 34 is formed so that the outer diameter increases from the partition wall 32 b of the case part 32 toward the engine 2. The torque converter 6 is accommodated in the housing portion 34.

The transmission mechanism 16 includes a first planetary gear set 36, a second planetary gear set 38, a third planetary gear set 40, and a fourth planetary gear set 42 disposed around the input shaft 14. Of these planetary gear sets 36, 38, 40, 42, the second planetary gear set 38 is disposed so as to overlap the outer periphery of the third planetary gear set 40, and the second planetary gear set 38, the third planetary gear set 40, Thus, a multi-stage planetary gear set 44 is configured. The radial dimension of the multistage planetary gear set 44 is larger than the radial dimension of each of the first planetary gear set 36, the fourth planetary gear set 42, and the output gear 28.
These planetary gear sets 36, 38, 40, 42 are arranged in a multi-stage planetary gear set 44, a first planetary gear set 36, a fourth planetary gear from the side far from the engine 2 toward the engine 2 along the direction in which the input shaft 14 extends. The output gear 28 is arranged adjacent to the engine 2 side of the fourth planetary gear set 42.
Each planetary gear set 36, 38, 40, 42 includes an external gear sun gear 36a, 38a, 40a, 42a, a plurality of planetary pinions meshed with the sun gears 36a, 38a, 40a, 42a, and these planetary pinions. Carriers 36b, 38b, 40b, 42b to be supported and ring gears 36c, 38c, 40c, 42c of internal gears meshed with pinions are provided.

  In particular, as shown in FIGS. 1 and 2, the multi-stage planetary gear set 44 is a connection type in which a ring gear 40 c of the third planetary gear set 40 on the inner peripheral side and a sun gear 38 a of the second planetary gear set 38 on the outer peripheral side are connected. It is a planetary gear set.

  The input shaft 14 is connected to the carrier 40b of the third planetary gear set 40, the carrier 38b of the second planetary gear set 38 and the carrier 42b of the fourth planetary gear set 42 are connected, and the carrier of the first planetary gear set 36 is connected. 36b and the ring gear 42c of the fourth planetary gear set 42 are coupled, and the carrier 42b of the fourth planetary gear set 42 and the output gear 28 are coupled.

  The second clutch 20 is disposed on the engine 2 side of the output gear 28, the first clutch 18 and the third clutch 22 are adjacent to the multi-stage planetary gear set 44, and the first clutch 18 is connected to the third clutch 22. It arrange | positions so that it may overlap with the outer peripheral part. The radial dimension of each of the first clutch 18 and the second clutch 20 is smaller than the radial dimension of the multi-stage planetary gear set 44.

The sun gear 36 a, the first clutch 18, and the third clutch 22 of the first planetary gear set 36 are respectively connected to the output shaft 20 a of the second clutch 20, whereby the input shaft is connected via the second clutch 20. 14 is connected to be connectable.
Further, the ring gear 38c of the second planetary gear set 38 is connected to the output shaft 18a of the first clutch 18, so that it can be connected to the input shaft 14 via the first clutch 18 and the second clutch 20. Has been.
The sun gear 38a of the second planetary gear set 38 (that is, the ring gear 40c of the third planetary gear set 40) is connected to the output shaft 22a of the third clutch 22, whereby the third clutch 22 and the second clutch 20 are connected. It is connected to the input shaft 14 via the via.

The first brake 24 is fixed to the inner periphery of the case body 32 a between the second clutch 20 and the output gear 28, and the sun gear 40 a of the third planetary gear set 40 and the sun gear 42 a of the fourth planetary gear set 42. To limit the operation of these sun gears 40a, 42a. The radial dimension of the first brake 24 is smaller than the radial dimension of the multi-stage planetary gear set 44.
The second brake 26 is fixed to the inner periphery of the case body 32a at the outer periphery of the ring gear 36c of the first planetary gear set 36, and is connected to the ring gear 36c of the first planetary gear set 36. Limit operation. The radial dimension of the second brake 26 is larger than the radial dimension of each of the first brake 24, the fourth planetary gear set 42 and the output gear 28.

  A desired forward shift speed or reverse shift speed is obtained by a combination of the engagement states of the first clutch 18, the second clutch 20, the third clutch 22, the first brake 24, and the second brake 26 described above. The automatic transmission 8 of the present embodiment can output eight forward speeds and reverse speeds as shown in the fastening table of FIG. 3 indicates that the clutches 18, 20, and 22 or the brakes 24 and 26 are in the engaged state, and no mark indicates that the clutches 18, 20, and 22 or the brakes 24 and 26 are in the released state. It shows that there is.

  For example, at the first speed of the automatic transmission 8, the first clutch 18 and the third clutch 22 are released, and the second clutch 20, the first brake 24, and the second brake 26 are engaged. Thereby, the rotation of the input shaft 14 is transmitted to the carrier 40 b of the third planetary gear set 40 and also transmitted to the sun gear 36 a of the first planetary gear set 36 via the second clutch 20. The rotation of the sun gear 36 a is decelerated and output from the carrier 36 b of the first planetary gear set 36 to the ring gear 42 c of the fourth planetary gear set 42. The rotation of the ring gear 42c is decelerated and output from the carrier 42b of the fourth planetary gear set 42 to the output gear 28.

  Next, as shown in FIG. 1, the counter mechanism 10 is arranged on the outer peripheral side (the vehicle rear side in FIG. 1) of the second clutch 20 and the output gear 28. The counter mechanism 10 includes a counter shaft 46 disposed so as to extend in parallel with the input shaft 14 of the automatic transmission 8, and a counter input provided on the counter shaft 46 and driven by the output gear 28 of the automatic transmission 8. And a counter output unit 50 that is provided on the counter shaft 46 and drives the differential mechanism 12. That is, the power output from the output gear 28 of the automatic transmission 8 is transmitted from the counter input unit 48 to the counter output unit 50 via the counter shaft 46 and output to the differential mechanism 12 connected to the counter output unit 50. Is done.

  Next, a configuration for operating the clutches 18, 20, and 22 of the automatic transmission 8 will be described with reference to FIGS. 1, 2, and 4. FIG. 4 is an IV-IV arrow view of the automatic transmission 8 according to the first embodiment of the present invention shown in FIG.

  Here, the first clutch 18, the second clutch 20, and the third clutch 22 sandwich the friction plates fixed to the output shafts 18 a, 20 a, and 22 a of the clutches 18, 20, and 22, respectively. And a friction mating plate fixed to the input shaft of the clutches 18, 20, and 22, and further, a fastening that operates in a direction in which these friction plates and the friction mating plate are pressed against each other (the axial direction of the input shaft 14). It has a piston. The first clutch 18, the second clutch 20, and the third clutch 22 are each engaged with a fastening hydraulic chamber to which hydraulic oil for controlling the fastening of the fastening piston is supplied, and the hydraulic oil in the fastening hydraulic chamber is fastened. A centrifugal cancel chamber for canceling centrifugal pressure generated by rotating around the input shaft 14 together with the hydraulic chamber is provided. The centrifugal cancel chamber is provided on the opposite side of the fastening hydraulic chamber with respect to the fastening piston along the direction in which the input shaft 14 extends.

  A valve body that controls supply and discharge of hydraulic fluid to and from the engagement hydraulic chambers of the first clutch 18, the second clutch 20, and the third clutch 22 is disposed in the vicinity of the automatic transmission 8. Further, an oil passage 52 that allows the valve body to communicate with the engagement hydraulic chambers of the first clutch 18, the second clutch 20, and the third clutch 22 is formed in the case body 32a.

As shown in FIGS. 1 and 4, an oil reservoir that stores hydraulic oil supplied to or discharged from the centrifugal cancel chambers of the first clutch 18, the second clutch 20, and the third clutch 22. The transmission case 30 extends over the outer periphery of the fourth planetary gear set 42, the outer periphery of the output gear 28, the outer periphery of the first brake 24, and the outer periphery of the second clutch 20. The case portion 32 is provided. That is, the oil reservoir 54 is offset to the engine 2 side along the direction in which the input shaft 14 extends from the multi-stage planetary gear set 44 and the first planetary gear set 36 in which the second brake 26 is disposed on the outer periphery. Has been placed.
The oil reservoir 54 is a substantially rectangular parallelepiped box that opens upward, and on the vehicle front side of the outer periphery of the case body 32a so that the bottom surface is at the same height as the input shaft 14. It is provided integrally with the case part main body 32a. Further, the oil reservoir 54 is provided with a cover 56 that covers the opening on the upper surface thereof. Furthermore, an opening 58 is formed in the upper part of the oil reservoir 54 so as to allow the oil reservoir 54 and the inside of the transmission case 30 to communicate with each other, and excess hydraulic oil is passed from the oil reservoir 54 to the opening 58. It is possible to return to the transmission case 30 via
Furthermore, an oil passage 60 that communicates the lower end of the oil reservoir 54 with the respective centrifugal cancel chambers of the first clutch 18, the second clutch 20, and the third clutch 22 includes a case part body 32 a of the case part 32, A partition wall 32b and an end cover 32c are formed. Since the oil reservoir 54 is provided above the outlet of the oil path 60 on the centrifugal cancel chamber side, the hydraulic oil in the oil reservoir 54 is supplied to the centrifugal cancel chamber by gravity.

  Next, the effect of the automatic transmission 8 according to the first embodiment of the present invention described above will be described.

  First, since the oil reservoir 54 is disposed at a position offset from the multiple-stage planetary gear set 44 along the direction in which the input shaft 14 extends, the position of the oil reservoir 54 is changed to the multiple-stage planetary gear set. 44, the oil reservoir 54 can be placed on the outer periphery of the automatic transmission 8 in order to suppress an increase in the axial dimension of the automatic transmission 8. It is also possible to suppress an increase in the radial dimension of the automatic transmission 8.

  In addition, since the oil reservoir 54 is disposed on the outer peripheral portion of the third planetary gear set 40 having a smaller radial dimension than the multi-stage planetary gear set 44, an oil reservoir is used to suppress an increase in the axial dimension of the automatic transmission 8. An increase in the radial dimension of the automatic transmission 8 can be suppressed while the storage portion 54 is disposed on the outer peripheral portion of the automatic transmission 8.

  Moreover, since the oil storage part 54 is arrange | positioned in the outer peripheral part of the 3rd planetary gear set 40 in which the brake is not arrange | positioned, the position of the oil storage part 54 is set to the 1st planetary gear set 36 in which the 2nd brake 26 is arrange | positioned. The oil reservoir 54 can be located on the inner circumference side compared to the case where the oil reservoir 54 is disposed on the outer circumference of the automatic transmission 8. 8, the increase in the radial dimension of the automatic transmission 8 can be suppressed.

  Further, since the oil storage portion 54 is disposed on the outer peripheral portion of the third planetary gear set 40 and the outer peripheral portion of the output gear 28 that are smaller in radial direction than the multi-stage planetary gear set 44, the axial dimension of the automatic transmission 8 is reduced. In order to suppress the increase, the oil storage portion 54 is disposed on the outer peripheral portion of the automatic transmission 8, and an increase in the radial dimension of the automatic transmission 8 can be suppressed. Further, the volume of the oil storage portion 54 can be reduced. Can be increased.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the arrangement of the oil reservoir 54 in the first embodiment described above is different, and the other configurations are the same, so only the differences will be described here. FIG. 5 is a skeleton diagram of a horizontal section passing through the central axis of the automatic transmission 8 according to the second embodiment of the present invention as viewed from above.

  According to the second embodiment, as shown in FIG. 5, the radial dimension of the second brake 26 is smaller than the radial dimension of the multi-stage planetary gear set 44. The oil reservoir 54 includes the outer periphery of the second brake 26 (that is, the outer periphery of the first planetary gear set 36), the outer periphery of the fourth planetary gear set 42, the outer periphery of the output gear 28, and the outer periphery of the first brake 24. , And the outer periphery of the second clutch 20 is provided in the case portion 32 of the transmission case 30. That is, the oil reservoir 54 is disposed at a position offset from the outer peripheral portion of the multistage planetary gear set 44 toward the engine 2 along the direction in which the input shaft 14 extends.

  Thus, according to the second embodiment, the oil reservoir 54 is disposed at a position offset from the multi-stage planetary gear set 44 along the direction in which the input shaft 14 extends. The oil reservoir 54 can be located on the inner circumference side than the case where the oil reservoir 54 is disposed on the outer circumference of the multi-stage planetary gear set 44, and thus the oil reservoir can be suppressed in order to suppress an increase in the axial dimension of the automatic transmission 8. An increase in the radial dimension of the automatic transmission 8 can be suppressed while 54 is arranged on the outer peripheral portion of the automatic transmission 8. Therefore, the same effect as the first embodiment described above can be obtained.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the arrangement of the oil reservoir 54 in the first embodiment described above is different, and the other configurations are the same, so only the differences will be described here. FIG. 6 is a skeleton diagram of a horizontal section passing through the central axis of the automatic transmission 8 according to the third embodiment of the present invention as viewed from above.

According to the third embodiment, as shown in FIG. 6, an oil reservoir that stores hydraulic oil that is supplied to or discharged from the centrifugal cancel chambers of the first clutch 18 and the third clutch 22. 54 a is provided in the case portion 32 of the transmission case 30 at the outer peripheral portion of the first clutch 18. That is, the oil reservoir 54a is disposed at a position offset from the multi-stage planetary gear set 44 to the opposite side of the engine 2 along the direction in which the input shaft 14 extends.
In addition, an oil reservoir 54 b that stores hydraulic oil supplied to or discharged from the centrifugal cancel chamber of the second clutch 20 is provided in the case portion 32 of the transmission case 30 in the outer peripheral portion of the second clutch 20. Is provided. That is, the oil reservoir 54b is disposed at a position offset from the multi-stage planetary gear set 44 toward the engine 2 along the direction in which the input shaft 14 extends.

  As described above, according to the third embodiment, the oil reservoirs 54a and 54b are arranged at positions offset from the multi-stage planetary gear set 44 along the direction in which the input shaft 14 extends, so that the oil reservoirs 54a and 54b The position of the oil reservoirs 54a and 54b can be set on the inner peripheral side compared to the case where the oil storage parts 54a and 54b are arranged on the outer peripheral part of the multi-stage planetary gear set 44. Therefore, the oil storage portions 54a and 54b are arranged on the outer peripheral portion of the automatic transmission 8, and an increase in the radial dimension of the automatic transmission 8 can be suppressed. Therefore, the same effect as the first embodiment described above can be obtained.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, the arrangements of the clutches 18, 20, 22, brakes 24, 26, output gear 28, planetary gear sets 36, 38, 40, 42, and the oil reservoir 54 in the first embodiment described above are different. Since other configurations are the same, only different points will be described here. FIG. 7 is a skeleton view of a horizontal section passing through the central axis of the automatic transmission 8 according to the fourth embodiment of the present invention as viewed from above, and FIG. 8 is according to the fourth embodiment of the present invention shown in FIG. 4 is a fastening table of the automatic transmission 8.

  According to the fourth embodiment, as shown in FIG. 7, the planetary gear sets 36, 38, 40, 42 are arranged in the first direction from the side far from the engine 2 toward the engine 2 along the direction in which the input shaft 14 extends. The first planetary gear set 36, the multi-stage planetary gear set 44, and the fourth planetary gear set 42 are arranged in this order, and the output gear 28 is adjacent to the fourth planetary gear set 42 between the multi-stage planetary gear set 44 and the fourth planetary gear set 42. Is arranged.

  The input shaft 14 is connected to the carrier 40b of the third planetary gear set 40 and the sun gear 42a of the fourth planetary gear set 42, and the sun gear 36a of the first planetary gear set 36 and the ring gear 38c of the second planetary gear set 38 are connected. Then, the ring gear 42c of the fourth planetary gear set 42 and the output gear 28 are connected.

  The first clutch 18 and the second clutch 20 are arranged adjacent to the engine 2 side of the multi-stage planetary gear set 44 so that the first clutch 18 overlaps the outer peripheral portion of the second clutch 20. Are arranged between the first planetary gear set 36 and the multi-stage planetary gear set 44.

The first clutch 18 and the second clutch 20 are connected to the carrier 42b of the fourth planetary gear set 42, respectively. The third clutch 22 is connected to the carrier 36 b of the first planetary gear set 36 and the sun gear 40 a of the third planetary gear set 40.
The carrier 38 b of the second planetary gear set 38 is connected to the output shaft 18 a of the first clutch 18 and the output shaft 22 a of the third clutch 22, whereby the fourth planetary gear set 42 is connected via the first clutch 18. It is connected to the carrier 42b of the first planetary gear set 36 via the third clutch 22 so that it can be connected and disconnected.
Further, the ring gear 40c of the third planetary gear set 40 (that is, the sun gear 38a of the second planetary gear set 38) is connected to the output shaft 20a of the second clutch 20, whereby the fourth planetary gear is connected via the second clutch 20. It is connected to the carrier 42b of the set 42 so as to be connectable and detachable.

The first brake 24 is fixed to the inner periphery of the case body 32a at the outer periphery of the ring gear 36c of the first planetary gear set 36, and is connected to the ring gear 36c of the first planetary gear set 36. Limit operation. The radial dimension of the first brake 24 is smaller than the radial dimension of the multi-stage planetary gear set 44.
The second brake 26 is fixed to the inner periphery of the case body 32a on the side farther from the engine 2 than the first planetary gear set 36, and is connected to the sun gear 36a of the first planetary gear set 36 so that the sun gear 36a. Limit the operation of

  Similar to the first embodiment described above, the desired forward shift speed or the combination of the engagement states of the first clutch 18, the second clutch 20, the third clutch 22, the first brake 24, and the second brake 26 described above. A reverse gear is obtained. As shown in the fastening table of FIG. 8, the automatic transmission 8 according to the present embodiment can output eight forward speeds and reverse speeds. 8 indicates that the clutches 18, 20, 22 or the brakes 24, 26 are in the engaged state, and no mark indicates that the clutches 18, 20, 22 or the brakes 24, 26 are in the released state. It shows that there is.

In the fourth embodiment, as shown in FIG. 7, an oil reservoir 54a that stores hydraulic oil supplied to or discharged from the centrifugal cancel chambers of the first clutch 18 and the second clutch 20 is provided. The outer peripheral portion of the output gear 28 and the outer peripheral portion of the fourth planetary gear set 42 are provided in the case portion 32 of the transmission case 30. That is, the oil reservoir 54a is disposed at a position offset from the multi-stage planetary gear set 44 toward the engine 2 along the direction in which the input shaft 14 extends.
In addition, an oil reservoir 54 b that stores hydraulic oil supplied to or discharged from the centrifugal cancel chamber of the third clutch 22 is disposed at the outer periphery of the first planetary gear set 36. The case portion 32 of the transmission case 30 is provided adjacent to the first brake 24 arranged in the portion. That is, the first brake 24 and the oil reservoir 54b are arranged offset from each other along the direction in which the input shaft 14 extends in the outer peripheral portion of the first planetary gear set 36. Further, the oil reservoir 54b is disposed at a position offset from the multiple-stage planetary gear set 44 to the far side from the engine 2 along the direction in which the input shaft 14 extends.

  As described above, according to the fourth embodiment, the first brake 24 and the oil reservoir 54b are arranged offset from each other along the direction in which the input shaft 14 extends in the outer peripheral portion of the first planetary gear set 36. Even when the first brake 24 is provided on the outer periphery of the first planetary gear set 36 having a smaller radial dimension than the multistage planetary gear set 44, the oil reservoir 54b is disposed on the outer periphery of the first planetary gear set 36. Accordingly, in order to suppress an increase in the axial dimension of the automatic transmission 8, the oil storage portion 54 b is arranged on the outer peripheral portion of the automatic transmission 8 and the radial dimension of the automatic transmission 8 is large. Can also be suppressed.

  Next, a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the arrangement of the oil reservoir 54b in the fourth embodiment described above is different, and the other configurations are the same, so only the differences will be described here. FIG. 9 is a skeleton diagram of a horizontal cross section passing through the central axis of the automatic transmission 8 according to the fifth embodiment of the present invention as seen from above.

  According to the fifth embodiment, as shown in FIG. 9, the oil reservoir 54 b is disposed on the outer periphery of the first brake 24 disposed on the outer periphery of the first planetary gear set 36. 32. That is, the oil reservoir 54b is disposed at a position offset from the multi-stage planetary gear set 44 to the side farther from the engine 2 along the direction in which the input shaft 14 extends.

  As described above, according to the fifth embodiment, the oil reservoirs 54a and 54b are arranged at positions offset from the multi-stage planetary gear set 44 along the direction in which the input shaft 14 extends, so that the oil reservoirs 54a and 54b The position of the oil reservoirs 54a and 54b can be set on the inner peripheral side compared to the case where the oil storage parts 54a and 54b are arranged on the outer peripheral part of the multi-stage planetary gear set 44, thereby suppressing an increase in the axial dimension of the automatic transmission 8. Therefore, the oil storage portions 54a and 54b are arranged on the outer peripheral portion of the automatic transmission 8, and an increase in the radial dimension of the automatic transmission 8 can be suppressed. Therefore, the same effect as the first embodiment described above can be obtained.

DESCRIPTION OF SYMBOLS 1 Powertrain structure 2 Engine 4 Output shaft 8 Automatic transmission 14 Input shaft 16 Transmission mechanism 18 1st clutch 20 2nd clutch 22 3rd clutch 24 1st brake 26 2nd brake 28 Output gear 36 1st planetary gear set 38 2nd Planetary gear set 40 Third planetary gear set 42 Fourth planetary gear set 36a, 38a, 40a, 42a Sun gear 36b, 38b, 40b, 42b Carrier 36c, 38c, 40c, 42c Ring gear 44 Multi-stage planetary gear set 52, 60 Oil passages 54, 54a, 54b Oil reservoir

Claims (5)

An automatic transmission that shifts and outputs power generated by a power source,
An input shaft to which power generated by the power source is input;
One or a plurality of multi-stage planetary gear sets configured by arranging at least two planetary gear sets on the inner and outer circumferences around the input shaft;
One or a plurality of clutches that transmit power input from the power source to the input shaft to the planetary gear set, and are moved by receiving a hydraulic pressure by the hydraulic oil and a fastening hydraulic chamber to which the hydraulic oil is supplied. A clutch having a fastening piston and a centrifugal cancellation chamber provided on the opposite side of the fastening hydraulic chamber with respect to the fastening piston along a direction in which the input shaft extends;
An oil reservoir that stores hydraulic oil that is supplied to the centrifugal cancel chamber of the clutch via an oil passage or discharged from the centrifugal cancel chamber via the oil passage;
The automatic transmission, wherein the oil reservoir is disposed at a position offset from the multi-stage planetary gear set along a direction in which the input shaft extends. And further comprising one or more planetary gear sets arranged around the input shaft,
The automatic transmission according to claim 1, wherein the oil storage portion is disposed on an outer peripheral portion of the one or more planetary gear sets. And a brake that is disposed on an outer periphery of the planetary gear set and restricts the operation of any of the sun gear, the carrier, or the ring gear of the multi-stage planetary gear set and / or the one or more planetary gear sets,
The automatic transmission according to claim 2, wherein the oil storage portion is disposed on an outer peripheral portion of the one or more planetary gear sets where the brake is not disposed. Furthermore, it has an output unit that outputs power from the multi-stage planetary gear set and / or the one or more planetary gear sets,
The output unit is disposed adjacent to the one or more planetary gear sets,
4. The automatic transmission according to claim 3, wherein the oil storage part is disposed on an outer peripheral part of the one or more planetary gear sets and on an outer peripheral part of the output part. And one or more planetary gear sets disposed around the input shaft;
The one or more planetary gear sets and / or a brake that restricts the operation of any of the sun gear, carrier, or ring gear of the multi-stage planetary gear set,
2. The automatic transmission according to claim 1, wherein the brake and the oil storage portion are arranged offset from each other along a direction in which the input shaft extends in an outer peripheral portion of the one or more planetary gear sets.

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