JPH0330540B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field The present invention relates to a so-called park lock device for fixing the output shaft of an automatic transmission so that it does not rotate in a parking range.

(2) Prior art Automatic transmissions operate the manual lever in Park (P) range, Reverse drive (R) range, Neutral (N) range, Forward automatic shift drive (D), 2nd gear engine brake drive () range, and 2nd gear engine brake drive () range. By operating the 1st gear engine brake drive () range, the manual valve in the shift control valve body becomes the corresponding range and operates in accordance with each range, but in the P range, the vehicle is parked. In order to maintain this condition, the transmission output shaft must be fixed so that it does not rotate, and a park lock device is provided for this purpose.

By the way, conventionally, the park lock device was normally constructed as shown in FIG.
No. 39850). In the figure, a is the transmission case.
b is a shift control valve body attached to the lower part of the valve body, c is a manual valve provided within the valve body, d is an operating lever for the manual valve, e
is its pivot shaft, f is a manual plate provided integrally with the operating lever d, g is a park rod connected to the tip of the manual plate, h is an actuator fitted to the park rod, i is a parking pole, and j is its pivot. The supporting shaft and k indicate its return spring, respectively.

When the manual lever is operated, the shaft e is rotated, and the lever d and the manual plate f are brought to the illustrated rotational position in the P range. Lever d sets manual valve c to the P range position,
The manual plate f moves the park rod g along with the actuator h to the right in the figure to be in the position shown. At this time, the actuator h uses its large diameter portion h' to rotate the parking pole i in the direction of the hour hand when viewed from the right side of the figure, and the pawl i' engages with the teeth of a parking gear (not shown). The output shaft of the transmission can be fixed in a non-rotatable manner by setting the transmission to the park clock position.

However, in such a park lock device, the park rod g extends in the direction of the main shaft of the automatic transmission (in the left-right direction in FIG. 3) and is a link mechanism that strokes in the same direction, so the overall length of the automatic transmission becomes long. . If this automatic transmission is arranged in tandem with the engine, and the power unit consisting of these automatic transmissions is installed horizontally in a front-wheel drive vehicle, it may not be possible to mount the automatic transmission unless the vehicle body width is increased.

On the other hand, in automatic transmissions for front-wheel drive vehicles, the shift control valve body is attached to the upper part of the transmission case to protect the valve body and increase ground clearance.
In this case, the manual valve and the parking gear are located at the farthest positions in the vertical direction of the transmission case, which makes the above-mentioned problem even more pronounced. (For example, Ford's ATX Auto
-omatic Transaxle) (3) Purpose of the Invention The present invention arranges the links constituting the park lock device in the vertical direction and moves them mainly in the same direction, thereby avoiding increasing the overall length of the automatic transmission. An object of the present invention is to provide a park lock device as described above.

(4) Structure of the Invention For this purpose, the park lock device of the present invention is provided with a valve body for speed change control in the upper part of the transmission case, and when the manual valve in the valve body is placed in the parking range, the parking pole is in the park lock position. In the automatic transmission, there is provided a manual plate that rotates in conjunction with the manual valve, a park rod that converts the rotation of the manual plate into a vertical stroke, and a park rod that is rotated by the stroke of the park rod to The present invention is characterized in that actuator levers for bringing the parking pole into the park lock position are arranged in order from the top.

(5) Examples Hereinafter, the present invention will be explained in detail with reference to illustrated examples.

1 and 2 show an embodiment of the present invention, in which 1 is a transmission case, 2 is a side cover, 3 is a parking gear that rotates together with the transmission output shaft, 4 is a parking pole, and 5 is a The pivot shaft 6 indicates a return spring of the parking pole 4, respectively. The parking lock device of the present invention rotates the parking pole 4 around the shaft 5 in the direction of the hour hand in FIG.
Therefore, rotation of the transmission output shaft is prevented and a predetermined park lock function is performed. The parking pole 4 is normally rotated by the return spring 6 in the counterclockwise direction in FIG.

Reference numeral 7 denotes a speed change control valve body attached to the upper part of the transmission case 1, and 8 denotes a manual valve therein. The manual valve 8 is engaged with the tip of an operating lever 9. A lever 9 is tied to one end of an operating shaft 10, and the other end of the shaft is rotatably passed through the transmission case 1 and tied to a control lever 11. By connecting one end (upper end in FIG. 1) of the control lever 11 to a manual lever on the driver's seat, the manual valve 8 can be set in a corresponding range when the manual lever is operated.

A manual plate 12 is integrally molded on the operating lever 9, so that the manual plate 12 assumes a rotational position corresponding to the range of the manual hull 8 by the shaft 10 when the manual lever is operated. P,
A roller 14 rotatably provided at the tip of a detent spring 13 at each rotating position of the manual plate 12 corresponding to the range R, N, D, etc.
Notches 12a to 12f into which the manual lever is recessed are formed on the outer periphery of the manual plate 12, and these provide a sense of moderation when changing each range of the manual lever.

The actuator lever 15 is disposed below the manual plate 12 and is pivotally supported on the transmission case 1 by a shaft 16, and the lever 15 and the manual plate 12 are linked together by a park rod 17. For this purpose, one end 17a of the park rod 17 is bent and pivoted to the manual plate 12, and the other end 17b is attached to the pivot block 18.
It is pivotally connected to the actuator lever 15 via. The pivot block 18 is prevented from coming off by a pin 19 and is slidably fitted into the park rod end 17b, and is elastically supported by a spring 20 at a position in contact with the pin 19, thereby functioning as described below. Configure the wait mechanism.

A pair of rollers 21 are rotatably supported at the tip of the actuator lever 15 in contact with each other, and a parking support 22 and a parking pole 4 are provided to bend the rollers 21 in a plane perpendicular to their respective axes.
The parking support 22
is attached to the transmission case 1 with bolts 23 and 24.

The operation of the above embodiment will be explained next.

As shown in FIGS. 1 and 2, when the manual lever is in the P range, the manual plate 12 is in a rotational position where the roller 14 is recessed into its notch 12a, and at this time the actuator lever 15 is moved through the park rod 17. into the pivoted position shown. As a result, the roller 21 is supported by the contoured surface 22a of the parking support 22 and descends along the cam surface 4b of the parking pole 4 in FIG. Thus,
The roller 21 moves the parking pole 4 to the rotational position shown in FIG. 1 and performs a predetermined parking lock function.

By the way, at this time, the claw 4 of the parking pole 4
a collides with the teeth of the parking gear 3 and cannot reach the rotational position shown in FIG. 18 while compressing the spring 20 in the longitudinal direction to reach the final position. Then, the parking gear 3 rotates due to the rolling of the wheels, and the pawl 4 is inserted into the tooth groove.
When a is aligned, the compression reaction force of the spring 20 rotates the actuator lever 15, rotates the parking pole 4 via the roller 21 to the position where the pawl 4a enters the tooth groove of the parking gear 3, Enables park lock.

When switching the manual lever from the P range to another range, the manual plate 12 is rotated in the direction of the arrow α in FIG. 2, and the actuator lever 15 is rotated in the direction of the arrow β in FIG. 2 via the park rod 17. At this time, the roller 21 is separated from the cam surface 4b, and the parking pole 4 is moved away from the return spring 6.
As a result, the pawl 4a is rotated to a position where it escapes from the tooth groove of the parking gear 3, and the park lock can be released.

(6) Effects of the Invention As described above, the park lock device of the present invention has a manual plate 12 that rotates in conjunction with the manual valve 8, a park rod 17 that converts the rotation into a vertical stroke, and a stroke of the park rod 17. The actuator lever 15, which is rotated by the actuator lever 15 to place the parking pole 4 in the park lock position, is arranged in order from the top.
2, 17, and 15 are arranged in the vertical direction, and these move mainly in the vertical direction, so that the park lock device of the present invention does not increase the total length of the automatic transmission (the length in the horizontal direction in Fig. 2). . Therefore, when the automatic transmission equipped with the device of the present invention is arranged in tandem with the engine and mounted on a transverse engine type front wheel drive vehicle, it can be installed without increasing the width of the vehicle body.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional rear view of the main part of an automatic transmission equipped with the park lock device of the present invention, Fig. 2 is a longitudinal sectional side view of the main part, and Fig. 3 is a sectional view of the main part of an automatic transmission showing a conventional park lock device. It is a diagram. 1... Transmission case, 2... Side cover, 3... Parking gear, 4... Parking pole, 5... Pivoting shaft, 6... Return spring, 7... Valve body, 8... Manual Valve, 9...Manual valve operation lever,
10... Operating shaft, 11... Control lever, 12... Manual plate, 13... Detent spring, 14... Roller, 15... Actuator lever, 16... Pivoting shaft, 17...
...Park rod, 18... Pivot block, 19...
...Keeping pin, 20...Waiting mechanism spring, 21...
...Roller, 22...Parking support, 23,
24...Mounting bolt.

Claims (1)

[Claims] 1. In an automatic transmission having a speed change control valve body provided in the upper part of the transmission case, and in which a parking pole is placed in the park lock position when the manual valve in the valve body is placed in the parking range, the automatic transmission is linked to the manual valve. a parking rod that converts the rotation of the manual plate into a vertical stroke; and an actuator that is rotated by the stroke of the parking rod and moves the parking pole to the park lock position. A park lock device for an automatic transmission characterized by having levers arranged in order from the top.