JPH0742831A - Detent mechanism of automatic transmission - Google Patents

Abstract

PURPOSE:To equip an automatic transmission with a detent mechanism, which is structured compactly, whose installation can be made in simple configuration, and whose degree of freedom in layout is widened. CONSTITUTION:To the stationary side a detent spring 10 is secured through a bracket 20, which is provided in the spring mounting part 21 with a projection pin 25, another one 18, and a bolt hole 23 in the up-down arrangement, and there a mounting part 12 for detent spring is secured. Therein the bolt hole 23 and another one 14 and a bolt 17 are positioned on a level with the center of a roller 13, wherein the line of load acting passes the bolt, and it can be managed with one bolt because of no twist existing. The bracket 20 extends in the direction of the roller 13 along the spring part 11 of the detent spring. Therefore, the whole construction of the detent spring and bracket can be made short and compact, generating no interference with any other component parts even inside of the narrow space of the transmission case, and it is possible to make layout easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detent mechanism for holding a selected position of a shift lever of an automatic transmission.

[0002]

2. Description of the Related Art A detent mechanism of this kind applied to a shift lever of an automatic transmission is disclosed in, for example, Japanese Patent Laid-Open No. 60-1.
There is one disclosed in Japanese Patent No. 39557. As shown in FIG. 4, a shaft 42, which is connected to a shift lever operated by a driver of a vehicle and rotates in conjunction with the operation thereof, is supported by a transmission case, for example.
A manual plate 43 is attached to the shaft 42 inside the transmission case. A manual valve or the like of a hydraulic circuit (not shown) is controlled according to the rotating position of the manual plate 43, and the range position is switched. The manual plate 43 is formed in a corrugated shape by forming notches 44 corresponding to respective select positions of the shift lever on the outer periphery thereof.

A detent spring 45 is attached to a fixed portion 40 such as a transmission case or a valve unit fixed in the transmission case, and a roller 46 provided at the tip of the detent spring.
Engages with the above-mentioned notch 44 and holds the manual plate 43 at a predetermined position to hold the select position selected by the shift lever. In the detent spring 45, the spring portion 47 is formed as a long plate in consideration of the required spring force and the strength when overcoming the notch in the outer periphery of the manual plate.

[0004]

However, in the above-mentioned conventional detent mechanism, the mounting portion 48 of the detent spring 45 to the fixed portion is formed on the extension of the spring portion 47 extending in the longitudinal direction, and the detent spring rotates. The pin 49, the fixing bolt 52, and the roller 46 at the tip of the spring portion are aligned in a straight line. Therefore, the detent spring 45 becomes a long component, which causes competition with other components such as an oil strainer and a control valve in a transmission case having a small space, and there is a problem that layout is difficult.

In addition to this, a structure in which instead of an extended mounting portion is fixed via a bracket is disclosed in Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Publication No. 9-183422, as shown in FIG. 5, instead of the detent spring 50 itself extending in a straight line, the bracket 51 extends in two directions parallel to and perpendicular to the detent spring 50. Each of the tips is fixed to the transmission case 55 with bolts 52, 52. For this reason, the planar shape as a whole becomes extremely large, which reduces the degree of freedom in layout design. Therefore, in view of the above conventional problems, it is an object of the present invention to provide a detent mechanism for an automatic transmission, which has a simple and compact overall structure and has a large degree of freedom in layout.

[0006]

Therefore, according to the present invention, there is provided a manual plate which is attached to a shaft which is supported by a transmission case of an automatic transmission and which rotates in conjunction with a shift lever, and which has an engaging portion on its outer periphery. In a detent mechanism including a detent spring having an engaging portion with the locking portion at an end of a spring portion and holding a selected position of the shift lever, a mounting portion of the detent spring on a fixed side is The detent spring extends from the end of the spring portion opposite to the engaging portion toward the engaging portion along the spring portion.

[0007]

Since the attachment portion of the detent spring to the fixed side extends from the end portion of the spring portion opposite to the engagement portion with the manual plate, it extends in the direction of the engagement portion along the spring portion. The entire detent spring including the mounting part is short and compact.

[0008]

1 and 2 show a first embodiment of the present invention. In particular, FIG. 1 is a plan view showing a state of being assembled in the transmission case, and FIG. 2 shows details of the detent spring and the bracket. In FIG. 2, (b) is a side view taken along the line AA in (a), and (c) is
It is a BB section sectional view of (b). A shaft 2 connected to a shift lever (not shown) is supported by the transmission case 1, and a manual plate 3 is attached to the shaft 2. A notch 4 as a locking portion is provided on the outer periphery of the manual plate 3 and has a wavy shape. A lever pin 8 is provided to be supported by the transmission case 1, and the lever 5 is attached to the lever pin 8. Only when the parking lock is set, the pin 9 attached to the lever 5 is connected to the manual plate 3. A parking rod 6 having a cam 7 for parking lock is connected to the lever 5.

Adjacent to the manual plate 3, there is provided a detent spring 10 which engages with the corrugated notch 4 of the manual plate 3. The detent spring 10 is formed of an elastic plate material and includes a spring portion 11 and a mounting portion 12, and a roller 13 that directly engages with the notch 4 at the tip of the spring portion 11.
Is provided. The bracket 20 is attached to the bottom wall of the transmission case 1 near the side wall 1a with bolts 22, the detent spring 10 is fixed to the bracket 20 at the attachment portion 12, and the spring portion 11 of the detent spring is a plan view. It extends obliquely with respect to the upper side wall 1a.

The longitudinal direction of the bracket 20 is the direction connecting the center of one of the fixing bolts 22 and the center of the other bolt 22, and the longitudinal direction is aligned with the direction in which the spring portion 11 of the detent spring extends. The directions are substantially parallel and in the same direction. The spring mounting portion 21 to which the detent spring 10 is mounted is erected substantially parallel to the side wall 1a of the transmission case in plan view. Therefore, in the detent spring 10, the mounting portion 12 is bent with respect to the spring portion 11 to form an angle.

As is particularly apparent from FIG. 2, the spring mounting portion 21 of the bracket 20 is provided with a bolt hole 23 welded with a nut 24 and a convex pin 25 in the vertical direction, and a convex pin 18 in a diagonal downward direction. In addition, in the mounting portion 12 of the detent spring, the bolt hole 23, the convex pin 25, the bolt hole 14 and the pin hole 15 corresponding to the convex pin 18, and the direction connecting the center of the convex pin 18 and the center of the convex pin 25. A long pin hole 19 is provided parallel to the pin. Then, the detent spring pin hole 15 is fitted into the bracket convex pin 25, and the detent spring pin elongated hole 19 is fitted into the bracket convex pin 18, respectively, and then the bolt 17 is inserted into the bolt hole 14 and the bolt hole 23.
The detent spring 10 is fixed to the spring mounting portion 21 of the bracket 20 by being screwed into the bracket 4.
Here, the center position of the bolt hole 23 and the center position of the bolt hole 14 of the detent spring are at the same height as the center position of the roller 13 at the tip, which is the point of action of the detent spring 10.

The present embodiment is constructed as described above, and the convex pin 25, the convex pin 18 as the positioning means and the bolt 17 as the fixing means in the fixing portion of the detent spring 10 and the bracket 20 are vertically arranged. Therefore, the total length of the detent spring 10 is shortened. Moreover, since the bracket 20 is also along the direction in which the spring portion 11 of the detent spring extends, the detent spring and the bracket as a whole are short and compact. As a result, even in a narrow space in the transmission case, there is an effect that the layout is facilitated without interfering with other components.

Further, the bolt holes 14 for fixing the both are also provided.
Has the same height as the center position of the roller 13, the load acting line passes over the bolt hole, and the spring portion of the detent spring will not be twisted only by fixing with the single bolt 17. Therefore, there is an advantage that the number of fixing bolts can be minimized. In this embodiment, the bracket is attached to the transmission case. However, the bracket is not limited to this, and the bracket may be attached to an appropriate fixed member such as a valve unit.

FIG. 3 shows a second embodiment. 3A is a plan view and FIG. 3B is a side view thereof. In this embodiment, the detent spring and the bracket are integrally formed from a plate material so that they can be directly fixed to a fixed side such as a transmission case. That is, in the detent spring 30, the mounting portion 32 is formed by bending the spring portion 31 having the roller 13 at the tip thereof at an end portion on the opposite side of the roller 13 from the side edge of the spring portion at a right angle. This bent portion serves as a connecting portion 33 between the spring portion and the mounting portion. The mounting portion 32 is connected to the spring portion 31 from this connecting portion.
To the roller 13 side in the same direction as, and bolt holes 34 are provided at both ends in the longitudinal direction. Then, the bolt holes 34 are used to bolt the bottom wall of the transmission case.

Due to the above-mentioned structure, the detent spring also has the effect of being compact as a whole without having a large extension from the spring portion except for the short connection portion in this embodiment. And since it does not require a separate bracket, fixing work in between,
There is an advantage that fixing bolts are unnecessary.

[0016]

As described above, according to the present invention, when the detent spring is attached to the fixed side in the detent mechanism, the attaching portion is from the end opposite to the engaging portion of the spring portion of the detent spring with the manual plate. Since it extends along the spring portion in the direction of the engaging portion, the entire detent spring including the mounting portion is short and compact. As a result, even in a narrow space in the transmission case, there is an effect that the layout is facilitated without interfering with other components.

[Brief description of drawings]

 ]

FIG. 1 is a plan view showing an assembled state of a transmission case according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a side surface and a cross section of a main part of the first embodiment.

FIG. 3 is a diagram showing a second embodiment.

FIG. 4 is a diagram showing a conventional example.

FIG. 5 is a diagram showing another conventional example.

[Explanation of symbols]

 1 Gearbox Case 2 Axis 3 Manual Plate 4 Notch 5 Lever 6 Parking Rod 7 Cam 8 Lever Pin 9 Pin 10 Detent Spring 11 Spring Part 12 Mounting Part 13 Roller 14 Bolt Hole 15 Pin Hole 17 Bolt (Fixing Means) 18 Convex Pin ( Positioning means 19 Pin long hole 20 Bracket 21 Spring mounting part 23 Bolt hole 24 Nut 25 Convex pin (positioning means) 30 Detent spring 31 Spring part 32 Mounting part 33 Connection part 34 Bolt hole 40 Fixing part 42 Shaft 43 Manual plate 44 Cutting Notch 45, 50 Detent spring 46 Roller 47 Spring part 48 Mounting part 49 Pin 51 Bracket 52 Bolt 55 Transmission case

Claims (5)

[Claims] 1. A manual plate, which is attached to a shaft that is supported by a transmission case of an automatic transmission and that rotates in conjunction with a shift lever, and has a locking portion on its outer circumference, and the locking portion at the end of a spring portion. In a detent mechanism including a detent spring having an engaging portion with and holding a selected position of the shift lever, a mounting portion of the detent spring to a fixed side is
A detent mechanism for an automatic transmission, characterized in that it extends from the end of the spring part of the detent spring on the opposite side of the engaging part toward the engaging part along the spring part. 2. The mounting portion is a bracket that is separate from the detent spring, and the detent spring is a fixing portion provided at an end of the spring portion opposite to the engaging portion, and is parallel to the shaft. The detent mechanism for an automatic transmission according to claim 1, wherein the detent mechanism is fixed to the bracket by a positioning means and a fixing means arranged on the bracket. 3. The positioning means comprises a convex pin provided on the bracket and a pin hole provided in a fixing portion of the detent spring corresponding to the convex pin, and the fixing means is a bolt / nut. The detent mechanism for an automatic transmission according to claim 2, characterized in that. 4. The detent of an automatic transmission according to claim 2, wherein the fixing means is located at the same height as the engaging portion of the detent spring in a direction parallel to the shaft. mechanism. 5. The automatic transmission according to claim 1, wherein the mounting portion is formed by bending a spring portion of a detent spring at an end opposite to the engaging portion. Detent mechanism.