JPH0621627B2 - Power transmission drum for automatic transmission - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission drum of an automatic transmission, which is provided in the automatic transmission and has a planetary gear device inside thereof.

(Prior Art) Conventionally, in an automatic transmission, each element of a plurality of planetary gear devices is selectively engaged and disengaged by a friction engagement element to achieve each shift speed.

When operating the engine brake, it is necessary to lock the sun gear of the front planetary gear unit and the sun gear of the rear planetary gear unit, and therefore a brake is provided. In this case, when a disc type brake is used, the size in the axial direction becomes large. Therefore, the power transmission drum is engaged with the sun gear and the band brake is arranged on the outer periphery of the power transmission drum.

By the way, the power transmission drum is provided internally with a gear speed change mechanism composed of a planetary gear unit and a friction engagement element, and in order to lubricate and cool a sliding portion of the gear speed change mechanism, a lubricating oil is constantly applied. It is being supplied. However, when the lubricating oil after lubricating and cooling the gear transmission mechanism collects in the power transmission drum, the lubricating oil is agitated by the friction engagement element and the oil temperature rises.

Therefore, the power transmission drum is provided with a hole for further discharging the lubricating oil discharged from the gear shift mechanism (see Japanese Utility Model Laid-Open No. 52-163690).

(Problems to be Solved by the Invention) However, in the power transmission drum of the automatic transmission configured as described above, the lubricating oil discharge hole is provided in the intermediate portion forming the large diameter portion of the power transmission drum. Therefore, a sufficient amount of lubricating oil cannot be released to the outside of the power transmission drum.

For example, when the lubricating oil discharge position of the planetary gear device that discharges a large amount of lubricating oil and the hole formed in the power transmission drum are arranged apart from each other in the axial direction, the lubricant discharged from the lubricating oil discharge position is used. First, oil flies in the power transmission drum by centrifugal force. The lubricating oil that hits the inner peripheral wall of the power transmission drum moves to the hole along the inner peripheral wall of the power transmission drum and is discharged to the outside of the power transmission drum from the hole.

Therefore, the lubricating oil discharged from the lubricating oil discharge position not only increases the flow time for moving to the hole after hitting the inner peripheral wall of the power transmission drum, but also the lubricating oil accumulated in the power transmission drum The rotation of the power transmission drum causes agitation, the lubricating oil foams, and the oil temperature rises.

The present invention solves the problem of the power transmission drum of the conventional automatic transmission described above, and further transmits the lubricating oil discharged from the lubricating oil discharging position of the planetary gear device through the lubricating oil discharging hole. An object of the present invention is to provide a power transmission drum of an automatic transmission that can be discharged to the outside of the drum.

(Means for Solving Problems) Therefore, the power transmission drum of the automatic transmission of the present invention is
A planetary gear unit and a friction engagement element are housed in the transmission case, one side is connected to one element of the planetary gear unit, and the other side is connected to the friction engagement element for power transmission. It is designed to communicate.

Further, in the planetary gear device, one of the ends is at a lubricating oil releasing position for releasing lubricating oil, and the power transmission drum has a hole for lubricating oil releasing at an outer peripheral position of the lubricating oil releasing position. Is formed.

(Operation and Effect of the Invention) According to the present invention, as described above, the power transmission drum is arranged in the transmission case, the planetary gear device and the friction engagement element are housed inward, and one side is the planetary gear. It is connected to one element of the device and the other side is connected to a friction engagement element for power transmission.

Further, in the planetary gear device, one of the ends is at a lubricating oil releasing position for releasing lubricating oil, and the power transmission drum has a hole for lubricating oil releasing at an outer peripheral position of the lubricating oil releasing position. Is formed.

Therefore, the lubricating oil that lubricates and cools the planetary gear device and is released from the lubricating oil releasing position is further released to the outside of the power transmission drum through the lubricating oil releasing hole.

Therefore, the lubricating oil discharged from the planetary gear device does not stay in the power transmission drum and is not stirred, and it is possible to prevent the performance of the lubricating oil from being deteriorated due to the foaming of the lubricating oil due to the stirring and the rise in the oil temperature.

(Example) Hereinafter, the Example of this invention is described in detail, referring drawings.

FIG. 1 is a sectional view showing a power transmission drum of an automatic transmission of the present invention, and FIG. 2 is a sectional view of an automatic transmission for a vehicle to which the power transmission drum of the automatic transmission 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-plate clutch C0 operated by a hydraulic servo, one multi-plate brake B0, and one one-way clutch F0, and the present invention. Second planetary gear device arranged in such power transmission drum
3, third planetary gear unit U2, two multi-plate clutches C1, C2 operated by hydraulic servo, one belt brake B
It is composed of one and two multi-plate brakes B2 and B3, and an underdrive transmission 300B having three forward gears and one reverse gear provided with two one-way clutches F1 and F2.

The transmission case 1 of the automatic transmission 100 is the torque converter 20.
Torque converter housing 120 accommodating 0, overdrive transmission 300A and underdrive transmission 300
A transmission case 130 integrally formed with each chamber that accommodates B and an extension housing 140 that covers the rear side of the automatic transmission 100. These torque converter housing 120, transmission case 130, and 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 a 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 205.
Direct coupling clutch (lock-up clutch) 209 that allows the front cover 201 and turbine shell 205 to rotate in the same direction
Is equipped with. 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. Further, on the rear side of the oil pump body 152, an oil pump cover 154 having a cylindrical front support 153 which is coaxial with the cylindrical portion 151 and protrudes rearward is fastened, and the oil pump housing 152 and the oil pump are covered. The cover 154 forms a partition between the torque converter housing 120 and the transmission case 130. Also, the transmission case
In the middle of 130, an overdrive mechanism room 130A in which an overdrive transmission 300A is formed and an underdrive machine room 1 in which an underdrive transmission 300B is formed
There is provided an intermediate support wall 132 having a cylindrical center support 131 that protrudes rearward to partition 30B. A rear support wall 134 having a cylindrical rear support 133 protruding forward is provided at a rear portion (right side in the drawing) of the transmission case 130.

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 tip slidingly contacting the hole 102 of the input shaft 10, has a flange portion 111 at the rear end portion of the intermediate transmission shaft 11, and has 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 by the hole 112 of the intermediate transmission shaft 11.

The overdrive transmission 300A is provided with a first planetary gear unit U0 behind the input shaft 10, and its ring gear R0 is coupled to the intermediate transmission shaft 11 via a flange plate 113.
The planetary carrier P0 is connected to the flange portion 101 of the input shaft 10, and the sun gear S0 is formed by the inner race shaft 13 of the one-way clutch F0. First planetary gear unit U0
A first hydraulic servo drum 14 opening rearward is fixed to the inner race shaft 13 on the front side of the first hydraulic servo drum.
An annular piston 15 is fitted between an outer peripheral wall 14A and an inner peripheral wall 14B of 14 to form a hydraulic servo C-0 of a clutch C0 that engages and disengages the carrier P0 and the first hydraulic servo drum 14, and also an inner race shaft. A return spring 16 for pressing the annular piston 15 toward the hydraulic servo C-0 side is provided on the 13 side, and a clutch C0 is provided inside the outer peripheral wall 14A.
The first hydraulic servo drum 14, the inner race shaft 13 and the carrier P0 are connected via 0. 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.
A piston 18 for pressing the brake B0 is fitted in front of the intermediate support wall 132 at the rear of the intermediate support wall 132 to form a hydraulic servo B-0 of the brake B0 between the piston 18 and the intermediate support wall 132.
The piston 18 is attached to the inner peripheral portion 135 of the front end of the hydraulic servo B-0.
A return spring 19 that presses to the side is fitted.

In the underdrive transmission 300B, first, the second hydraulic servo drum 20 that opens to the rear in the front is rotatably fitted onto the outer periphery of the center support 131 of the intermediate support wall 132, and is located between the outer peripheral wall 20A and the inner peripheral wall 20B. An annular piston 21 for pressing the clutch C2 is fitted into the cylinder C2 to form a hydraulic servo C-2 of the clutch C2 between the annular piston 21 and the second hydraulic servo drum 20, and the annular piston 21 is provided on the inner peripheral wall 20B side. Return spring 22 that pushes to the −2 side, outer peripheral wall 2
Clutch C2 is installed inside 0A. Behind the second hydraulic servo drum 20, a third hydraulic servo drum 24, which is open rearward and has an annular projection 23 at the front, is fixed to the outer periphery of the flange portion 111 at the rear portion of the intermediate transmission shaft 11.
An annular piston 25 for pressing the clutch C1 is fitted between the rear end portion of the intermediate transmission shaft 11, the outer peripheral wall 24A of the third hydraulic servo drum 24 and the outer periphery of the flange portion 111 so that the annular piston 25 is fitted.
The hydraulic servo C-1 of the clutch C1 is formed between the third hydraulic servo drum 24 and the third hydraulic servo drum 24, and the annular piston 25 and the return spring 26 that presses the hydraulic servo C-1 toward the inner peripheral side of the clutch C1 and the annular protrusion 23 are provided. A clutch C2 is attached to the outer periphery of the second hydraulic servo drum 20 and the second hydraulic servo drum 24 are connected via the clutch C2. The third hydraulic servo drum
A second planetary gear unit 3 is provided behind the 24.
The second planetary gear device 3 includes a sun gear S1 connected to the rear side of the power transmission drum 2 described below, a pinion gear G1 that meshes with the sun gear S1, a ring gear R1 that meshes with the pinion gear G1, and a pinion. The carrier P1 includes a pinion shaft Pa that rotatably supports the gear G1 and a shaft support portion Pb that supports the pinion shaft Pa. The shaft support portion Pb of the carrier P1 is a connection between the power transmission drum 2 and the sun gear S1. The shaft Pa is supported on the front side opposite to the portion side, and the ring gear R1 is a ring on the front side, which is the position opposite to the coupling side of the power transmission drum 2 of the shaft support portion Pb and the sun gear S1. It is supported by the gear flange 27. Sun gear S of the second planetary gear unit 3
1, the lubricating oil supplied to the pinion gear G1, the ring gear R1 and the like is discharged to the inner circumference of the ring gear R1, and the ring gear flange 27 is provided on the front side of the ring gear R1. Output ring gear R1
An annular protrusion 28 and a clutch C provided so as to project in front of a ring gear flange 27 that is rotatably supported on the outer periphery of the clutch 12.
1 is connected to the third hydraulic servo drum 24, and the carrier P1 is spline-fitted to the outer periphery of the front side of the output shaft 12,
The sun gear S1 is integrally formed at the tip of a sun gear shaft 29 rotatably provided on the outer periphery of the output shaft 12. The lubricating oil is supplied to the planetary gear device 3 from the rear end of the ring gear R1 at the lubricating oil discharge position 3A for discharging the lubricating oil to the outer periphery. Second and third hydraulic servo drums 20, 24 and second planetary gear device
Servo drum 2 molded to cover 3 in the smallest space
The power transmission drum 2 of the present invention for transmitting power from 0 to the sun gear shaft 29 has the front end of the outer periphery of the second hydraulic servo drum 20 and the sun gear shaft 29 behind the second planetary gear device 3.
Linked to and.

The front end of the power transmission drum 2 is the second hydraulic servo drum 20.
The front drum 2B is fixed to the outer periphery of the front drum 2B and the rear drum 2C whose rear end is connected to the sun gear shaft 29 behind the second planetary gear device 3. The power transmission drum 2 includes the front drum 2B and the rear drum. 2C are meshed with each other to form a clearance 2D, and the clearance 2D discharges the lubricating oil in the power transmission drum 2 to the outside of the power transmission drum 2. Further, the lubricating oil supplied to the second planetary gear device 3 discharged from the lubricating oil discharge position 3A is distributed to the outer peripheral position of the lubricating oil discharge position 3A of the second planetary gear device 3 which discharges a large amount of lubricating oil. The lubricating oil discharge hole 2A having a sufficient size is provided, and the lubricating oil discharged from the lubricating oil discharge position 3A to the outer periphery by the centrifugal force is quickly transferred to the power transmission drum 2 through the lubricating oil discharge hole 2A. It is released to the outer circumference. A belt brake B1 that fixes and releases the power transmission drum 2 is provided on the outer peripheral side of the front drum 2B of the power transmission drum 2.

The spline 136 formed on the inner periphery of the rear part of the transmission case 130 is spline-fitted with the brake plate b2 of the brake B2 on the front side and the brake plate b3 of the brake B3 on the rear side. A fourth hydraulic servo drum 32 having an annular protrusion 31 on the front side is spline-fitted. An annular piston 33 for pressing the brake B2 is fitted between the outer peripheral wall 32A of the fourth hydraulic servo drum 32 and the annular projection 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 is formed, and a return spring 34 for pressing the annular piston 33 toward the hydraulic servo B-2 side is provided on the inner peripheral wall 32B side. Also brake B2
A one-way clutch F1 having a sun gear shaft 29 as an inner race is provided on the inner peripheral side of the, and a brake B2 is attached to the outer periphery of the outer race 35. A plurality of pistons 371 and 373 for pressing the brake B3 and a reaction sleeve 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 is connected to the fourth hydraulic servo drum 32 on the outer circumference of the sun gear shaft 29, and the one-way clutch F2.
A brake B3 is attached to the outer periphery of the outer race 40. In the third planetary gear device 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 outer periphery of the parking gear 41. The provided ring gear R2 is connected to the output shaft 12 via a connecting member 42 whose inner circumference is spline-fitted. When the parking gear 41 selects the shift lever of the automatic transmission to the parking (P) position, the parking claw 43 causes the parking gear 41 to move.
Is provided so as to fix the output shaft 12.

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, the brake, and the 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 sectional view showing a power transmission drum of an automatic transmission of the present invention, and FIG. 2 is a sectional view of an automatic transmission for a vehicle to which the power transmission drum of the automatic transmission of the present invention is applied. In the figure, 1 ... transmission mechanism case, 2 ... power transmission drum, 2
A: lubricating oil discharge hole, 2B: front drum, 2C: rear drum, 2D: gap, 3 ... (second) planetary gear device,
3A: Lubricating oil discharge position, 100: Automatic transmission

Front page continuation (72) Inventor Yasushi Ando 1 Toyota-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor Motoki Endo 1-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd.

Claims (2)

[Claims] 1. A transmission case, which is disposed in a transmission case, accommodates a planetary gear device and a friction engagement element inward, one side is connected to one element of the planetary gear device, and the other side is a friction engagement element. In a power transmission drum of an automatic transmission that is coupled and transmits power, the planetary gear device is at a lubricating oil discharge position at which one end releases lubricating oil,
A power transmission drum of an automatic transmission, wherein a hole for lubricating oil discharge is formed at an outer peripheral position of the lubricating oil discharge position. 2. A power transmission drum for an automatic transmission according to claim 1, wherein one element of the planetary gear device is a sun gear.