JPH0756331B2 - Automatic transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission including an inner fitting member for supporting a rotating member that receives power and rotates.

[Prior Art] An overdrive case accommodating a conventional automatic transmission overdrive device is formed separately from the transmission case, and is connected to the transmission case with a bolt (Japanese Patent Publication No.
56-53671). The shaft that transmits the output from the overdrive to the third speed portion is supported by the overdrive case.

However, in the above-described conventional configuration, it is difficult to secure the centering of the overdrive case and the transmission case, in other words, the centering property of the output shaft of the overdrive, and the accuracy is also deteriorated. Will occur.

In addition, the number of parts increases, and the number of man-hours for assembling increases, which causes a problem of cost increase.

Therefore, a method of integrally forming the overdrive case and the transmission case can be considered. By integrally forming the case, the number of parts used for connecting the conventional overdrive case and the transmission case can be reduced, and the number of assembling steps can be reduced. In that case, in order to center and support the output shaft that transmits power from the overdrive to the third speed portion, a center support is provided as an inner fitting member on the inner peripheral side of the transmission case.

[Problems to be Solved by the Invention] An internal fitting member to be internally fitted in a transmission case is disclosed in JP-A-57-1847.
As described in Japanese Patent Publication No. 58 and Japanese Utility Model Laid-Open No. 55-161162, the inner fitting member is made as thin as possible and has the minimum necessary shape in order to reduce the weight of the automatic transmission and shorten the axial direction. Is desirable. However, by making the inner fitting member thin and lightweight, there are no irregularities that can be grasped by hand during assembly or removal, making it difficult to manually attach and remove the inner fitting member.

Also, since the inner fitting member is closely fitted to the inner peripheral surface of the transmission case, if the inner fitting member is inclined with respect to the vertical surface of the inner peripheral surface of the transmission case, it is difficult to assemble or remove the inner fitting member. It was

Furthermore, the inner fitting member divides the transmission case into two parts, and the planetary gears are arranged in each part, so that the difference in rotation between them causes a pressure difference between the two chambers, and the height of the oil level in both chambers is displaced. Then, the lubricating oil was agitated.

Therefore, the present invention provides an internal fitting member that is fitted into the inner peripheral surface of a transmission case and has good splittability and assemblability, and eliminates a pressure difference between transmission mechanism chambers partitioned by the internal fitting member. The purpose is to do.

[Means for Solving the Problems] In order to solve the above problems, the present invention relates to a fluid transmission device that transmits power from a power source to a transmission, a fluid transmission device case that houses the fluid transmission device, A transmission case connected to the fluid transmission device case; a first transmission device that is housed in the transmission case and uses the output shaft of the fluid transmission device as an input shaft to achieve a plurality of shift speeds; and the transmission case. Housed inside,
An output shaft of the first transmission is used as an input shaft, and a second transmission that achieves a plurality of shift speeds is spline-fitted to an inner peripheral surface of the transmission case to accommodate the first transmission. A chamber and a chamber accommodating the second transmission, are defined, have a hole that connects the two chambers, and have a rotation support shaft portion that rotatably supports the output shaft of the first transmission. In the automatic transmission including a fitting member, the hole provided in the inner fitting member is a tap hole having a female screw, and has a configuration of the automatic transmission.

[Operation and Effect of the Invention] In the automatic transmission of the present invention having the above-described configuration, the inner fitting is provided in the inner fitting member fitted into the transmission case, and the inner circumference is formed in the tap hole of the female screw. , By attaching a jig having a male screw corresponding to this female screw and inserting and removing this jig, the inner fitting member can be easily removed and assembled, and the assemblability and the separability are improved. Since it is not necessary to form unevenness for manually assembling or removing the inner fitting member, it is possible to reduce the thickness and weight.

Further, although the inside of the transmission is divided by the inner fitting member, since the tap hole is provided so as to penetrate the inner fitting member, the tap hole serves as a breather for keeping the atmospheric pressure in the separated transmission case the same.

[Embodiment] Next, an embodiment of an automatic transmission including an inner fitting member provided with a tap hole of the transmission case of the present invention will be described.

FIG. 1 is a sectional view of an automatic transmission for a vehicle to which a transmission case inner fitting member of the present invention is applied.

The automatic transmission 100 includes a hydraulic torque converter 200, a transmission 300, and a hydraulic control device 400.

The transmission 300 includes an overdrive transmission 300A having a first planetary gear unit U0, one multi-disc clutch C0 operated by a hydraulic servo, one multi-disc brake B0, and one one-way clutch F0, and a second planetary gear unit. Gear device
U1, third planetary gear unit U2, two multi-plate clutches C1, C2 operated by hydraulic servos, one belt brake B1,
It is composed of two multi-plate brakes B2, B3 and an underdrive transmission 300B having three forward gears and one reverse gear provided with two one-way clutches F1, F2.

The transmission case 1 of the automatic transmission 100 is the torque converter 2
Torque converter housing 120 accommodating 00, overdrive transmission 300A and underdrive transmission 30
A transmission case 130 integrally formed with each chamber for housing 0B and an extension housing 140 that covers the rear side of the automatic transmission 100. The torque converter housing 120, the transmission case 130, and the extension housing. Each of them is fastened with a large number of bolts.

The torque converter 200 is housed in a torque converter housing 120 whose front (engine side) is open, and is rotated by a front cover 20 that is driven by an engine (not shown) to rotate.
1, an annular plate-shaped rear cover 202 welded to the inner circumference of the front cover 201, a pump impeller 203 provided around the inner wall of the inner wall surface of the rear cover 202, and a turbine arranged to face the pump impeller 203 Runner 204, the turbine runner 2
Turbine shell 205 holding 04, one-way clutch 2
The stator 208, which is supported by the fixed shaft 207 connected to the transmission case 1 via 06, increases the torque capacity when the input speed is low, the front cover 201 and the turbine shell 20.
A direct coupling clutch (lock-up clutch) 20 that rotates the front cover 201 and the turbine shell 205 at the same time with the 5
Equipped with 9. An internal gear oil pump having an external gear 150a and an internal gear 150b therein is provided between a tubular transmission case 130 continuous to the rear of the torque converter housing 120 and the torque converter housing 120.
An oil pump body 152 that accommodates 150 and has a cylindrical portion 151 that protrudes forward on the inner circumference is provided in the transmission case 130.
The extension member 210 fastened to the front portion of the rear cover 202 and connected to the inner peripheral end portion of the rear cover 202 has the external gear 15 through the inner periphery of the tubular portion 151.
It is spline-fitted to the inner circumference of 0a. On the rear side of the oil pump body 152, an oil pump cover 154 having a cylindrical front support 153 that is coaxial with the cylindrical portion 151 and protrudes rearward is fastened, and the oil pump body 152 and the oil pump are The cover 154 forms a partition between the torque converter housing 120 and the transmission case 130. In the middle of the inner circumference of the transmission case 130 of the transmission case 1, the overdrive transmission 3
The inner fitting member 2 having a tubular supporting portion 2A protruding rearward that partitions the overdrive mechanism chamber 130A in which 00A is formed and the underdrive mechanism chamber 130B in which the underdrive transmission 300B is formed is internally fitted. Is provided. The inner fitting member 2 has an overdrive mechanism chamber 130A and an underdrive mechanism chamber 130B as shown in FIG. 1, FIG. 2 and FIG.
A tap hole 3 having a female thread 3A is formed inside the partition wall 2B for separating the inner fitting member 2 and the outer peripheral surface 2C of the inner fitting member 2 from the inner circumference of the transmission case 130.
The outer peripheral rear end surface 2D of the outer peripheral surface of the transmission case 130 contacts the step 130C formed in the transmission case 130, and the outer peripheral front end surface 2E of the outer peripheral rear end surface 2D is supported by the ring-shaped mounting tool 4 which is fitted in the inner peripheral surface of the transmission case 130. The inner fitting member 2 is supported, and the lower inner circumference is provided to be fastened in the transmission case 130 with bolts via the transmission case 130 to the fastening screw portion 2F having a female thread. Rear part of the transmission case 130 (right side in the figure)
A rear support wall 134 having a cylindrical rear support 133 protruding forward is provided on the.

Inside the front support 153, the torque converter 2
Fixed shaft of one-way clutch 206 supporting stator 208 of 00
A torque converter 207 is fitted inside the fixed shaft 207.
The input shaft 10 of the transmission 300, which is the output shaft of 200, is rotatably supported. The input shaft 10 has a flange portion 101 at the rear end portion, and a rearward facing hole 102 is formed at the center of the rear end portion. An intermediate transmission shaft 11 arranged in series with the input shaft 10 is rotatably mounted behind the input shaft 10.
The intermediate transmission shaft 11 has its front end slidably contacting the inside of the hole 102 of the input shaft 10, a flange portion 111 at the rear end of the intermediate transmission shaft 11, and an output shaft 12 for transmitting power to the drive wheel side at the center. Is formed with a rearward facing hole 112 in which the tip of the slide contact. Output shaft 12
In the extension housing 140, a sensor rotor 121 for detecting the number of rotations and a speedometer drive gear 122 are fixed, and a rear end portion is provided with a spline groove 123 on the outer periphery for externally fitting a sleeve yoke for transmitting power to the drive wheel side. It is formed and is rotatably supported by the extension housing 140 via the sleeve yoke, and the front end is rotatably supported in the hole 112 of the intermediate shaft 11.

The overdrive transmission 300A is provided with a first planetary gear unit U0 behind the input shaft 10, its ring gear R0 is coupled to the intermediate transmission shaft 11 via a flange plate 113, and the planetary carrier P0 is connected to the input shaft 10. Combined with the flange 101, the sun gear S0 is the inner race shaft of the one-way clutch F0.
It is formed by 13. On the front side of the first planetary gear unit U0, a first hydraulic servo drum 14 opening rearward is fixed to the inner race shaft 13, and an annular piston 15 is provided between an outer peripheral wall 14A and an inner peripheral wall 14B of the first hydraulic servo drum 14. Is engaged to form the hydraulic servo C-0 of the clutch C0 that engages and disengages the carrier P0 and the first hydraulic servo drum 14, and the annular piston 15 is provided on the inner race shaft 13 side.
A clutch C0 is mounted inside the return spring 16 and the outer peripheral wall 14A that are pressed toward the −0 side, and the first hydraulic servo drum 14, the inner race shaft 13 and the carrier P0 are connected via the clutch C0. A one-way clutch F0 having an inner race shaft 13 as an inner race is provided on the inner circumference of the first hydraulic servo drum 14, a clutch C0 and a brake B0 are provided between the outer race 17 and the transmission case 130 on the outer circumference thereof, and a brake B0 is provided. Inner fitting member 2 behind
Of the brake B0 is formed between the piston 18 and the inner fitting member 2, and a piston 18 for pressing the brake B0 is formed in front of the piston 18 at the front end inner peripheral portion 135 of the inner fitting member 2. The return spring 19 for pressing the hydraulic servo B-0 side is fitted.

In the underdrive transmission 300B, first, a second hydraulic servo drum 20 having a rear opening on the front side is rotatably fitted on the outer circumference of the tubular support portion 2A of the inner fitting member 2, and the outer peripheral wall 20A and the inner peripheral wall 20B thereof are rotatably fitted. An annular piston 21 that presses the clutch C2 between
Is fitted, and the annular piston 21 and the second hydraulic servo drum
A hydraulic spring C-2 of the clutch C2 is formed between the two, a return spring 22 that presses the annular piston 21 toward the hydraulic servo C-2 side on the inner peripheral wall 20B side, and a clutch C2 inside the outer peripheral wall 20A are mounted. There is. Behind the second hydraulic servo drum 20, there is an annular projection that opens rearward and forward.
The third hydraulic servo drum 24 having 23 is fixed to the outer periphery of the flange portion 111 at the rear portion of the intermediate transmission shaft 11,
A ring-shaped piston 25 for pressing the clutch C1 is fitted between the rear end of the second hydraulic servo drum 24 and the outer peripheral wall 24A of the third hydraulic servo drum 24 and the outer periphery of the flange portion 111, and between the ring-shaped piston 25 and the third hydraulic servo drum 24. A clutch C1 is formed by forming a hydraulic servo C-1 of the clutch C1, a return spring 26 that presses the annular piston 25 toward the hydraulic servo C-1 on the inner peripheral side of the clutch C1, and a clutch C2 on the outer periphery of the annular protrusion 23. The second and third hydraulic servo drums 20 and 24 are connected via C2. Behind the third hydraulic servo drum 24, a second
A planetary gear unit U1 is provided, and the ring gear R1 has an annular projection 28 and a clutch C1 which are provided so as to project in front of a rotation supporting member 27 which rotatably supports the ring gear R1 on the outer periphery of the output shaft 12. Via the third hydraulic servo drum 24, the carrier P1 is spline-fitted to the front outer periphery of the output shaft 12, and the sun gear S1 is integrated with the tip of a sun gear shaft 29 rotatably provided on the outer periphery of the output shaft 12. Is formed in. Further, a connecting drum 30 molded so as to cover the second and third hydraulic servo drums 20 and 24 and the second planetary gear device U1 in the minimum space is fixed to the outer periphery of the second hydraulic servo drum 20 at the front end thereof. The rear end is connected to the sun gear shaft 29 at the rear of the second planetary gear unit U1, and a belt brake B1 for fixing and releasing the connecting drum 30 is provided on the outer peripheral side.

A brake plate b2 of the brake B2 and a brake plate b3 of the brake B3 are spline-fitted to the front and rear of the spline 136 formed on the inner periphery of the rear of the transmission case 130, and the front between the brake B2 and the brake B3. A fourth hydraulic servo drum 32 having an annular protrusion 31 on the front side is spline-fitted. An annular piston 33 that presses the brake B2 is fitted between the outer peripheral wall 32A of the fourth hydraulic servo drum 32 and the annular protrusion 31, and the hydraulic servo B- of the brake B2 is inserted between the annular piston 33 and the fourth hydraulic servo drum 32. 2, a return spring 34 for pressing the annular piston 33 toward the hydraulic servo B2 is provided on the inner peripheral wall 32B side. Also, on the inner circumference side of the brake B2, a one-way clutch F1 whose inner race is the sun gear shaft 29 is used.
Is provided, and the brake B2 is attached to the outer periphery of the outer race 35. A plurality of pistons 371, 373 for pressing the brake B3 and a reaction plate 372 are fitted into the annular hole 36 formed between the outer side of the rear support 133 of the rear support wall 134 of the rear side of the brake B2 and the transmission case 130 to brake. A return spring 38 that forms a hydraulic servo B-3 of B3 and presses the pistons 371 and 373 toward the hydraulic servo B-3 side is supported by a return spring fitting 38A attached to the tip of the rear support 133. The inner race 39 of the one-way clutch F2 arranged on the inner circumference of the brake B3 has the fourth hydraulic servo drum 32 on the outer circumference of the sun gear shaft 29.
A brake B3 is attached to the outer periphery of the outer race 40 of the one-way clutch F2. Third planetary gear unit U2
The sun gear S2 is formed integrally with the sun gear shaft 29, the carrier P2 is connected to the outer race 40 of the front one-way clutch F2, the brake B3, and the ring gear R2 having the parking gear 41 provided around the outer circumference. The inner periphery of the output shaft 12 is connected to the output shaft 12 through a spline-fitting connecting member 42.
The parking gear 41 is provided so that the parking claw 43 meshes with the parking gear 41 and fixes the output shaft 12 when the shift lever of the automatic transmission is selected to the parking (P) position.

The transmission 300 has a transmission case 130 depending on vehicle driving conditions such as vehicle speed and throttle opening.
Engagement of each clutch and brake by the hydraulic pressure selectively output from the hydraulic control device 400 in the valve body 403 built in the oil pan 402 fastened to the lower part of the Alternatively, the gear is released, and four forward gear shifts or one reverse gear shift is performed. Table 1 shows an example of the operation of each clutch, brake, and one-way clutch and the achieved shift speed (RANGE).

In Table 1, E indicates that the corresponding clutch and brake are engaged, and X indicates that the corresponding clutch and brake are released. L has a corresponding one-way clutch engaged in the engine drive state, but the engagement is not always required because the transmission of power is ensured by a clutch or a brake installed in parallel with the one-way clutch ( Lock).
(L) indicates that the corresponding one-way clutch is engaged only in the engine drive state and is not engaged in the engine brake state. Further, f indicates that the corresponding one-way clutch is free.

[Brief description of drawings]

FIG. 1 is a front view of the inner fitting member, and FIG. 2 is A- shown in FIG.
A sectional view, FIG. 3 is a rear view of the inner fitting member, and FIG. 4 is an automatic transmission for a vehicle to which a tab hole of the transmission case inner fitting member of the present invention is applied. In the figure, 1 ... transmission case, 2 ... internal fitting member, 3 ... tap hole, 3A ... internal thread, 100 ... automatic transmission

Front Page Continuation (72) Koji Sumiya, 10 Takane Fujii-cho, Anjo City, Aichi Prefecture, Aisin Warner Co., Ltd. (56) References Japanese Patent Publication Sho 56-53671 (JP, B2)

Claims (1)

[Claims] 1. A fluid transmission device for transmitting power from a power source to a transmission, a fluid transmission device case for housing the fluid transmission device, a transmission case connected to the fluid transmission device case, and the transmission case. A first transmission that is housed in the transmission case and that uses the output shaft of the fluid transmission device as an input shaft to achieve a plurality of shift speeds;
A second transmission that uses the output shaft of the transmission as an input shaft and achieves a plurality of shift stages; and a chamber that is spline-fitted to an inner peripheral surface of the transmission case and that houses the first transmission. An inner fitting member that defines a chamber that houses the second transmission, has a hole that communicates the two chambers, and has a rotation support portion that rotatably supports the output shaft of the first transmission; The automatic transmission including the automatic transmission, wherein the hole provided in the inner fitting member is a tap hole having a female screw.