JPH07144616A - Park locking device for transmission - Google Patents

Abstract

PURPOSE:To prevent the reaction force supplied from a parking pawl from acting to an operating system for a parking pawl which is engaged with a parking gear and carries out park lock. CONSTITUTION:In the operation to a park locking position, a manual shaft 3 turns a manual brake 4 in the direction of arrow, and pushes a sleeve 12 to the chain double-dashed line position. A conical surface 6 turns a parking pawl 2 toward a parking gear 1, and allows a top end hook to be engaged with tooth of the parking gear 1, and a parking lock state is generated. Since the conical surface 6 is formed to the sleeve 12 which is freely fitted on a parking rod 5, and is restrained in the diametral direction by a guide 16 installed on a transmission case 8, the reaction force supplied from the parking pawl 2 is received by the transmission case 8 through the guide 16, and the reaction force is prevented from acting on a parking rod 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking lock device for putting a transmission in a parkable state.

[0002]

2. Description of the Related Art Conventionally, as a parking lock device, for example, one shown in FIG. 3 is known. This parking lock device includes a parking gear 1 that rotates together with a transmission output shaft.
And a swingable parking pole 2 that engages with the locking pole to lock the transmission output shaft.
The parking rod 5 is axially displaced by the rotation of the manual plate 4 via the parking rod 2, and the parking pole 2 is rotated toward the parking gear 1 by the cam action of the tapered conical surface 6 on the parking rod. Is.

At this time, from the parking pole 2 to the conical surface 6
The reaction force acting on the support 7 fixed to the transmission case
To allow the parking pole 2 to be engaged with the parking gear 1. Therefore, the parking gear 1 is prevented from rotating, and the transmission output shaft can be locked to obtain the parking lock state.

[0004]

However, in such a conventional parking lock device, as shown in FIG. 4, when the parking lock state is entered, the connecting portion between the manual plate 4 and the park rod 5 is twisted. As a result, the manual plate 4 is inevitably deformed as indicated by the chain double-dashed line, and there is a concern that the manual plate 4 may be damaged or that the park lock cannot be performed thereafter.

[0005] In solving this problem is or increase the park rod mounting hole 4 _a manual plate 4, by changing the position of the manual shaft 3, it is considered that entanglement force is prevented from acting on the manual plate 4 However, in this case, a new problem arises in that the operation stroke for the parking lock increases and the degree of freedom regarding the layout of the manual shaft 3 decreases.

In addition to the above, other conventional techniques, for example, JP-A-57-
As described in Japanese Laid-Open Patent Publication No. 198150 and Japanese Patent Laid-Open No. 59-23753, a structure in which a park rod is horizontally mounted on a transmission case and a reaction force from a parking pole is received by this horizontal mounting portion. Is also proposed.

However, in this structure, a large load is applied to the park rod due to the reaction force, the park rod must have a large diameter capable of withstanding this reaction force, and the support span for the transmission case is also restricted. hand,
The degree of freedom in layout is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a parking lock device for a transmission, which can solve the problems of the above conventional devices.

[0009]

To this end, the present invention comprises a parking gear which rotates with a transmission output shaft, wherein the parking pole is cammed by axial displacement of a tapered conical surface on the park rod. In a device that engages with the vehicle to put the transmission in a park lock state, the conical surface is formed on a sleeve loosely fitted on the park rod with a radial gap, The transmission case may be provided with a guide for guiding the sleeve while receiving the reaction force acting on the sleeve.

[0010]

When the driver axially displaces the tapered conical surface on the park rod, the conical surface engages the parking pole with the parking gear by a cam action. As a result, the parking gear is locked, and as a result, the transmission can be put into the parking lock state by locking the transmission output shaft.

By the way, the conical surface is formed on a sleeve which is loosely fitted on the park rod with a radial gap, and a guide for guiding the sleeve while receiving a reaction force acting on the sleeve from the parking pole. Was installed in the transmission case,

All of the above reaction force will be received by the transmission case via the sleeve, so that this reaction force does not act on the park rod at all, and therefore the connection point between the park rod and the member operating it. Is crushed,
It is possible to solve the problem that the member is deformed, and for the same reason, it is necessary to make the diameter of the park rod large, or the span of support of the park rod with respect to the transmission case is restricted, and the design is free. It is also possible to solve problems such as a decrease in degree.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment of the parking lock device according to the present invention. In these figures, parts having the same functions as those in FIGS. 3 and 4 are designated by the same reference numerals.

In this embodiment, the park rod 5 is slidably mounted on the transmission case 8 and the park rod bracket 9 is connected by a pin 10 to the park rod. Then, the front end of the manual plate 4 is engaged with the bracket 9, the base end of the manual plate 4 is fitted onto the manual shaft 3, and the manual shaft 3 is extended so as to form a right angle with respect to the park rod 5 so that the transmission case is formed. Cross over to 8. Thus, when the manual shaft 3 is rotated in the direction of the arrow in FIG.
It is assumed that the park rod 5 is stroked to the left in FIG.

A parking pole 2 which engages with a parking gear 1 which rotates with a transmission output shaft to provide a parking lock state is pivotally supported on a transmission case by a shaft 11 as shown in FIG. It extends in a direction parallel to the park rod 5 and is mounted horizontally on the transmission case.

In this embodiment, the tapered conical surface 6 for rotating the parking pole 2 is formed at the tip corner of the sleeve 12, as clearly shown in FIG. 1, and the sleeve 12 is mounted on the park rod 5. It is loosely fitted with a radial gap 13. Then, between the sleeve 12 and the bracket 9,
The spring 14 is contracted so that the sleeve 12 is biased toward the parking pole 2, but the biasing position is limited by the snap ring 15 that is engaged with the park rod 5.

The sleeve 12 is slidably guided on the outer peripheral surface thereof by a guide 16 fitted in the transmission case 8, whereby the sleeve 12 can be displaced in the axial direction, but it can be displaced in the radial direction. Shall be restrained.

The operation of the above embodiment will be described below. When the driver operates the parking lock position, the manual shaft 3 rotates in the direction of the arrow in FIG. 1 to rotate the manual plate 4 in the corresponding direction. As a result, the park rod 5 is sunk through the bracket 9 to the left in FIG. Here, the bracket 9 pushes the spring 14 in the same direction to move the sleeve 12 to the position shown by the chain double-dashed line in FIG. 1, and the conical surface 6 formed on the sleeve 12 cams the parking pole 2 in the direction of the arrow in FIG. Is turned to. Thus, the parking pawl 2 can be engaged with the teeth of the parking gear 1 by the claws at the tip thereof to lock the parking gear, and thus the transmission output shaft, to achieve the parking lock state.

Here, the tip of the parking pole 2 collides with the teeth of the parking gear 1 and the parking pole 2 cannot perform the above rotation, so that the sleeve 12 causes the spring 14 to press the above movement. If blocked, spring 14
Is contracted to allow the stroke of the park rod 5. At this time, the sleeve 12 is increased in spring force from the spring 14 to be in the park lock standby state, and the tip of the parking pole 2 can be engaged with the teeth of the parking gear 1 by a slight rotation of the transmission output shaft. When it came to
The sleeve 12 can be urged by the spring 14 to achieve the park lock state.

By the way, in the structure of this embodiment, the tapered conical surface 6 for rotating the parking pole 2 is formed especially on the sleeve 12, and this sleeve 12 is provided with a radial gap 13 on the park rod 5. Since the sleeve 12 is loosely fitted, and the sleeve 12 is radially restrained by the guide 16 provided in the transmission case 8, all the reaction force from the parking pole 2 is received by the transmission case 8 via the guide 16. , This reaction force does not act on the park rod 5 at all. Therefore, the connecting portion between the park rod 5 and the operating system is not twisted, and the operating system is not deformed or damaged. Further, the park rod 5 does not have to have a high strength, its diameter can be reduced, and the supporting span can be freely determined, so that the degree of freedom is increased.

In the above example, the park rod 5 is slidably supported on the transmission case, but it may be fixed and the bracket 9 may be slidable on the park rod 5 instead. There is no end. However, in this case, of course, it is necessary to remove the ring 15 that limits the stroke of the sleeve 12.

[0022]

Thus, the parking lock device of the present invention is
As described in claim 1, the tapered conical surface for rotating the parking pole so as to engage with the parking gear is formed in the sleeve loosely fitted on the park rod with a radial gap. Since the transmission case is provided with a guide for guiding the sleeve while receiving the reaction force acting on the sleeve from the pole, all of the above reaction force is received by the transmission case through the sleeve. The force does not act on the park rod at all, so that the problem that the member connecting the park rod and the member operating this is twisted and the member deforms can be solved, and for the same reason, The park rod needs to have a large diameter, and the support span of the park rod for the transmission case is restricted, which reduces design freedom. It is also possible to solve a problem.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a transmission showing an embodiment of a parking lock device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 and viewed in the direction of the arrow.

FIG. 3 is a perspective view illustrating a conventional park lock device.

FIG. 4 is an explanatory view of the same operation.

[Explanation of symbols]

 1 Parking Gear 2 Parking Pole 3 Manual Shaft 4 Manual Plate 5 Park Rod 6 Tapered Conical Surface 8 Transmission Case 9 Park Rod Bracket 12 Sleeve 13 Gap 14 Spring 16 Guide

Front page continuation (72) Inventor Isamu Onuma 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. A parking gear that rotates together with a transmission output shaft, wherein the parking pole is engaged with the parking gear by a cam action by axial displacement of a tapered conical surface on a park rod to put the transmission in a park lock state. In the device, the conical surface is formed on a sleeve loosely fitted on the park rod with a radial gap, and the sleeve is provided while receiving a reaction force acting on the sleeve from the parking pole. A guide lock device for a transmission, characterized in that a guide for guiding is provided in the transmission case.