JPH081252B2 - Gear shift operation device for automatic transmission for vehicle - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a vehicle automatic transmission in which two planetary gear transmissions are coaxially arranged in series in series and the vehicle automatic transmission is aimed at improving the operability of a parking mechanism. The present invention relates to a shift operating device for a transmission.

[Prior Art] A transmission of an automatic transmission for a vehicle mounted on a vehicle in which an engine is installed in front and rear wheels or four wheels are driven is generally an upper portion of a transmission case having a substantially tubular shape. The transmission is housed in the (cylindrical portion), the lower portion (frame portion) formed from the peripheral wall side is integrally provided under the tubular portion, and the hydraulic mechanism, the parking mechanism, and other control mechanisms are housed in the frame portion. Then, an oil pan is fastened to the lower surface of the frame portion to form a control mechanism chamber. In this type of automatic transmission, a first planetary gear for combining a multi-plate frictional engagement device and a planetary gear set at the front portion of the cylindrical portion to obtain a small number of overdrive or underdrive gear stages of about two gears. A second planetary gear transmission, which is a normal underdrive for obtaining a plurality of forward gears and reverse gears, which is equipped with a gear transmission and mainly uses a band brake for the purpose of shortening the axial dimension in the rear portion of the cylindrical portion. The mounted arrangement is advantageous from the viewpoints of common parts of automatic transmissions of different models such as the number of gears, additional increase of gears, and compactness in this case. In this type of automatic transmission, a speed-selecting (or speed-changing) operating mechanism is generally a select (or shift) lever provided in a driver's seat and both end portions of the frame portion below the second planetary gear transmission. , A detent lever, a link member to a manual valve, etc. are attached in the middle, and the parking mechanism is usually composed of a manual shaft connected to the select lever at a protruding portion protruding from the frame wall. A parking gear provided on the output member at the rear of the transmission,
One end of the parking gear is pivotally attached to the frame wall portion, and the pawl arm has a pawl that meshes with the parking gear when displaced upward; and one end is pivotally attached to one end of the detent lever. The other end of the parking rod is loosely fitted in a support cylinder provided in the frame wall portion behind the pawl arm and has a tapered portion for moving the pawl arm up and down.

[Problems to be Solved by the Invention] In the above conventional configuration, since the length of the parking rod is limited to a relatively short length, when the manual shaft is rotated by operating the select lever, the rotational movement of the detent lever is linearly moved. The parking rod that changes to slides so that the support cylinder, which is the fulcrum, twists relatively large,
This large prying motion is the biggest obstacle to improving the operability of the select lever. Further, since the band brake of the second planetary gear transmission is usually provided with a fluid pressure actuator (hydraulic servo) in the frame portion, when the both ends of the manual shaft are supported by the frame wall of the transmission case, a manual brake is used. The selection range of the shaft mounting position is extremely limited.

An object of the present invention is to reduce the twisting movement of the parking rod inside the support cylinder and to increase the stroke length of the parking rod to improve the operability of the parking mechanism and ensure the lubrication of the parking mechanism. It is an object of the present invention to provide a gear shift operation device for an automatic transmission.

[Means for solving the problem]

A shift operation device for an automatic transmission for a vehicle according to the present invention is a first planetary gear device that combines a multi-plate friction engagement device and a planetary gear set in a front portion of a transmission case to achieve two shift speeds. Place the gear transmission, and at the rear,
A second planetary gear transmission having at least one band brake device for achieving forward and multiple reverse gear stages and having a parking gear is coaxially arranged, and the lower part of the first planetary gear transmission is In the center position, the rotation center axis is perpendicular to the rotation center of the first planetary gear transmission, and both ends are rotatably supported by the front end of the transmission case, and the many-direction sheft is mounted on the vehicle. The first link mechanism that is connected to rotate according to the displacement of the select lever disposed in the driver's seat and the valve body of the hydraulic control device that is arranged at the lower end position of these planetary gear transmissions is slidable Is mounted on the manual valve for controlling the gear shifting operation of the hydraulic control device according to the selection by the select lever, and And a second link mechanism for transmitting power, and a front end portion is pivotally supported by a day tent lever fixed to the manual shaft, and a rear end portion is slidably supported by a support cylinder provided in the transmission case. And the lower gear of the parking gear arranged at the rear portion of the second planetary gear device arranged coaxially with the first planetary gear transmission can be displaced to a position meshing with the parking gear and a position not meshing with the parking gear. And a parking rod having a taper portion for moving the arm with a claw up and down.

[Operation and effect of the invention]

In the present invention, the manual shaft and the day tent lever are arranged below the first planetary gear transmission at the front end of the transmission case, and the parking rod whose front end is pivotally supported by the day tent lever is transmitted. The length of the parking rod can be made sufficiently long by associating it with the parking gear of the second planetary gear transmission arranged at the rear end of the case.

As a result, the linear movement of the parking rod due to the rotational movement of the day tent lever becomes smooth, and the prying movement between the support cylinder and the parking rod is reduced.

By increasing the length of the day tent lever in the radial direction, the stroke length of the parking rod can be increased, and the slope of the taper portion provided on the parking rod can be determined to be in an optimum state. The vertical movement of the claw arm with respect to the sliding can be made smooth, and the certainty of the operation of the select lever to the parking position is enhanced.

According to the present invention, the manual shaft is rotatably supported by the front end of the transmission case at both ends thereof at the lower position of the first planetary gear transmission, and the support cylinder corresponds to the second planetary gear transmission. By being provided, the parking rod can be made sufficiently long in the longitudinal direction of the transmission case, and because of this length, the twisting motion with respect to the support cylinder can be reduced, and the parking rod can be slid smoothly. Because you can exercise, the operability of the select lever is improved.

Particularly, in the present invention, since the mounting position of the manual shaft shift is the lower position of the first planetary gear transmission arranged in the front part of the transmission case, the multi-plate friction engagement device and the planetary gear set are arranged. 2 in combination
At the lower end position of the first planetary gear transmission that achieves the gear shift stage, there is no member protruding below the multi-plate friction engagement device in the transmission case, and temporarily the second gear. Even if a band brake device is provided at the foremost end in the axial direction of the planetary gear transmission and a fluid pressure actuator (hydraulic servo) for band brake operation is arranged and fixed in the transmission case, the manual shifter is installed. When the both ends are rotatably supported by the transmission case with the central axis of rotation thereof being perpendicular to the rotational center of the first planetary gear transmission, the hydraulic servo of the band brake device does not prevent it. It can be installed together with the day tent lever in a space with plenty of space, and the mounting position of the manual shaft is the same as the first By setting the lower gear position of the star gear transmission, the excess oil of the lubricating oil for lubricating and cooling the planetary gear set and the multi-plate friction engagement device of the first planetary gear transmission flows down to the mounting position of the manual shaft. Then
Lubricate the pivot of the manual transmission to the transmission case, the pivotal connection between the transmission and the first link mechanism and the second linkage, and the pivot of the parking rod in the day tent lever fixed to the manual shift. Therefore, it is possible to cool them, smooth the operation of these pivotal portions, and improve the durability.

Further, the second planetary gear transmission is provided with at least one band brake device for achieving a plurality of forward gears and a reverse gear, and the axial dimension of the second planetary gear transmission is shortened as much as possible. However, the gear element of the planetary gear set that is braked by the band brake of the second planetary gear transmission is usually integrally molded or fixed to the drum-shaped member due to the requirement for strength. The planetary gear set is located on the outermost side in the diametrical direction and is braked by a brake band engaged with the outer peripheral surface of the planetary gear set. In this case, since the lubricating oil that lubricates the planetary gear set located inside the drum-shaped member flows down into the member, the hole formed in the member while avoiding the brake band engagement position on the outer peripheral surface of the member. Is emitted from the transmission case. The released lubricating oil is moved up and down by the support cylinder provided in the transmission case, the sliding support portion of the parking rod, and the taper portion of the parking rod, and the position where it meshes with the parking gear and the position where it does not mesh. It is effectively used to lubricate the arm with a claw that can be displaced to and.

EXAMPLES Next, the present invention will be described based on the examples shown in the drawings.

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

The transmission 300 includes a first planetary gear set p1 and a multi-disc clutch operated by a hydraulic servo.
C0, one multi-plate brake B0, and one one-way clutch F0, and an overdrive planetary gear transmission (first planetary gear transmission) 10 and a second planetary gear set for obtaining two speed stages. p2, 3rd planetary gear set
p3, two multi-plate clutch C operated by hydraulic servo
1, C2, 1 belt brake B1, 2 multi-plate brakes B
2, B3, and an underdrive planetary gear transmission (second planetary gear transmission) 40 having three forward gears and one reverse gear, which includes two one-way clutches F1 and F2.

The case of the automatic transmission is a cylinder provided with front and rear chambers for accommodating a torque converter housing 120 for accommodating a torque converter 200, and an overdrive planetary gear transmission 10 and an underdrive planetary gear transmission 40 at the upper end. It has a portion 20, the lower end of which has an oil pan fastened to the lower end surface thereof, and a substantially rectangular frame portion 50 in which a valve body of a hydraulic control device, a parking mechanism, etc. are mounted inside is integrally cast in a skirt shape. A transmission case 130 provided for the transmission and an extension housing 140 that covers the rear end of the automatic transmission. These torque converter housing 120 and transmission case 130
And the extension housing 140 are fastened with a large number of bolts so as to have a coaxial center.

The torque converter 200 is housed in a torque converter chamber 121 of the torque converter housing whose front (engine side) is open, and is connected to an output shaft of an engine by a front cover 111 and an annular plate welded to the front cover 111 at its outer periphery. -Shaped rear cover 112, a pump impeller 205 provided around the inner wall of the inner wall surface of the rear cover 112, a turbine runner 206 arranged to face the pump impeller 205, and a turbine shell 207 holding the turbine runner 206. A stator 201 supported by a fixed shaft 203 via a one-way clutch 202, and the front cover 111 and turbine shell
A direct coupling clutch (lockup clutch) 113 that directly couples with 207 is provided. A gear-type oil pump 1 is internally provided between the torque converter chamber 121 and a transmission chamber 132 of the cylinder portion 20 of the transmission case that is continuous behind the torque converter chamber 121.
An oil pump body 151 having a tubular portion 152 that houses 50 and projects forward is provided in the transmission case 1.
A cylindrical front support 15 which is fitted and fastened to the front end surface of 30 and has a coaxial core with the cylindrical portion 152 on the rear side of the oil pump body 151 and projects rearwardly.
The oil pump cover 154 having 3 is fastened. The oil pump body 151 and the oil pump cover 154 form a housing 155 of the oil pump, which is a partition wall between the torque converter chamber 121 and the transmission chamber 132 and a front support wall of the transmission. Further, an intermediate support wall 159, which separates the overdrive mechanism chamber 133 and the underdrive mechanism chamber 134 and has a cylindrical center support 158 protruding rearward, is separately cast and fitted in the middle of the transmission chamber 132. Has been. At the rear of the transmission case 130, a rear support wall 157 having a cylindrical rear support 156 protruding forward is provided by integral casting. A transmission chamber 132 accommodating a transmission is formed between the oil pump housing (partition wall or front supporting wall) 155 and the rear supporting wall 157, and an output shaft chamber 141 of the transmission is formed between the rear supporting wall 157 and the extension housing 140. Is formed. An electronically controlled sensor rotor 143 and a speedometer drive gear 144 are fixedly attached to the output shaft in the output shaft chamber 141, and the front support 153 is provided at the rear end.
A sleeve yoke (not shown) coaxial with the above is inserted.

Torque converter 200 inside the front support 153
The fixed shaft 203 of the one-way clutch 202 that supports the stator 201 is fitted and the input shaft 11 of the transmission, which is the output shaft of the torque converter 200, is rotatably supported inside the fixed shaft 203. A flange 12a is provided on the rear edge of the front support 153 of the input shaft 11, and the rear end 12 has a slightly larger diameter and has a central hole facing the shaft rearward.
13 are formed. Behind the input shaft 11, the tip is inserted into the center hole 13 and rotatably supported, the rear end 15 is formed to have a slightly larger diameter, and the tip of the output shaft 36 is inserted to the shaft center. Rear facing center hole that is inserted and rotatably supported
An intermediate transmission shaft provided with 16 and arranged in series with the input shaft 11.
14 are rotatably arranged. The output shaft 36 is spline-fitted at a middle portion 37 with a flange plate 82 provided with a rearwardly projecting shaft supporting portion 81 that meshes with a ring gear of the third planetary gear set p3, and at a rear portion 38, the sleeve yoke is spline-fitted. I am fit.

The operating mechanism 1 for shifting or selecting the speed of the automatic transmission is
A select lever 1A provided in the driver's seat and a side wall of the frame portion 50 below the overdrive planetary gear transmission 10 that is connected to the select lever 1A via a link mechanism 1B.
Both ends 2A and 2B are supported by 50A and 50B, and a detent lever 3 and a manual shaft 2 to which a link member 4B to a manual valve 4A of a valve body 4 is attached in the middle. The parking mechanism 5 is provided with a parking gear 85 provided on an output member (a ring gear R2 described later) of a transmission, and one end pivotally attached to a wall of the frame portion 50 below the parking gear 85, and an upper portion thereof. A claw arm 6 having a claw 6A that meshes with the parking gear 85 when displaced, one end 8A is pivotally attached to one end 3A of the detent lever 3, and the other end 8B is behind the claw arm 6 in the transmission case. It comprises a parking rod 8 having a taper portion 8C which is loosely fitted in a support cylinder 7 fixedly attached to and has the tapered arm 6 vertically moved. As described above, the manual shaft 2 is provided at the front end of the frame portion 50 of the transmission case 130, and the support cylinder 7 is provided near the rear end of the frame portion 50, so that the parking rod 8 serves as a fulcrum of the support cylinder 7. The distance from the pivot point to the detent lever 3 is sufficiently large, and the twisting motion in the support cylinder part can be reduced with respect to the rotational movement of the detent lever 3, allowing smooth reciprocating motion, which allows the operability of the select lever 1A. Can be improved.

Further, since the hydraulic servo of the band brake is not provided at the mounting position of the manual shaft 2, it is possible to relatively freely provide the manual shaft with both ends supported. Also, because this manual shaft 2 is installed,
Since the space of this portion of the frame portion 50 is designed to be large, there is an advantage that the lubricating waste oil dropped from the overdrive planetary gear transmission 10 can smoothly pass through this portion and return to the oil pan below. The arrow K in FIG. 2 indicates the direction of rotation of the rotary member of the first planetary gear transmission. Front parking gear
When the shift lever of the automatic transmission is selected to the parking (P) position 85, the parking claw 6A meshes with the parking gear 85 and fixes the output shaft 36.

The transmission 300 has a transmission case 13 depending on vehicle driving conditions such as vehicle speed and throttle opening.
The hydraulic pressure selectively output from the hydraulic control device 400 in the valve body 1 built in the oil pan 401 fastened to the skirt portion of the lower part of 0 by the bolt 402 to the hydraulic servo of each friction engagement device causes The brake is engaged or released to perform four forward gear shifts or one reverse gear shift.

[Effects of the Embodiment] a) Since the manual shaft is provided in the lower shell of the first planetary gear transmission that does not use the band brake,
The degree of freedom of the mounting position of the penetration type manual shaft with both ends supported by the frame wall is large, and the design is advantageous.

B) Since the detent lever is attached, the frame portion is formed large in the lower portion of the first planetary gear transmission, so that the lubricating oil can be smoothly discharged from the first planetary gear transmission.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic transmission for a vehicle using a shift operation mechanism of an automatic transmission according to the present invention, FIG. 2 is a sectional view taken along the line AB, and FIG. 3 is a shift operation of an automatic transmission according to the present invention. FIG. 4 is a schematic view of the mechanism, FIG. 4 is a bottom view of the parking mechanism, and FIG. 5 is a sectional view of the parking gear portion. In the figure, 1 ... shift mechanism of automatic transmission, 1A ... select lever, 2 ... manual shaft, 3 ... detent lever, 5 ... parking mechanism, 6 ... arm with claw, 7 ... support cylinder,
8 ... Parking rod, 85 ... Parking gear, 200 ... Torque converter, 300 ... Transmission, 400 ... Hydraulic control device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikazu Sakaguchi 10 Takane, Fujii-cho, Anjo-shi, Aichi Aisin Warner Co., Ltd. In-house (72) Inventor Kazuaki Watanabe 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Corporation (56) References JP-A-60-159453 (JP, A) JP-A-51-119464 (JP, A) ) Actually open 58-139265 (JP, U) Actually open 57-65154 (JP, U) Actually open 56-158358 (JP, U)

Claims (1)

[Claims] 1. A first planetary gear transmission that achieves two speed stages by combining a multi-plate friction engagement device and a planetary gear set in the front part of a transmission case.
A second part having a planetary gear set and at least one band brake device at the rear part thereof to achieve a plurality of forward gears and a reverse gear and to have a parking gear.
An automatic transmission for a vehicle, wherein a planetary gear transmission is coaxially arranged, and a control mechanism including a valve body of a hydraulic control device and a parking mechanism is arranged in a lower part of the planetary gear transmission, wherein the first planetary gear transmission is provided. A lower shaft position, a rotation shaft of which is perpendicular to a rotation center of the first planetary gear transmission, and both end portions of which are rotatably supported by a front end portion of the transmission case; A first link mechanism that connects the manual shaft to rotate according to the displacement of a select lever arranged in the driver's seat of the vehicle, and the rotation of the manual shaft is slidably arranged on the valve body. A second link mechanism that transmits to a manual valve that controls a shift operation of the hydraulic control device according to selection by the select lever; Part is pivotally supported by a day tent lever fixed to the manual shaft, a rear end part is slidably supported by a support cylinder provided in a transmission case, and a parking gear of the second planetary gear transmission is provided. And a parking rod provided with a taper portion for vertically moving a claw-like arm displaceable between a position engaging with the parking gear and a position not engaging with the parking gear. Gear change operation device.