JPH026298Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a governor mechanism for an automatic transmission for a vehicle that suppresses changes in the attitude of the governor pin so that the rotation of the governor shaft is not hindered by the governor pin. Regarding.

[Conventional technology]

As a conventional governor mechanism for a vehicle automatic transmission, there is one shown in FIGS. 2A and 2B, for example. This governor mechanism has a governor shaft 3 having a governor gear 2 that meshes with a drive gear 1 of an automatic transmission, and a governor body 4 provided at one end of the governor shaft 3. The governor gear 2 has a driven gear 5 for a speedometer. They mesh together.
The governor shaft 3 is housed in a case 6, and a large diameter portion 3a inscribed in the case 6 is provided in the upper part of the governor shaft 3.
A small diameter portion 3b forming a groove is provided, and the governor main body 4 is surrounded by a cover 7. The case 6 is provided with an insertion hole 9 into which the governor pin 8 is inserted, and the governor pin 8 inserted into the insertion hole 9 is closed by a bolt member 10. The governor pin 8 has a circular base portion 8a, a square operating portion 8b, and circular first and second tip portions 8.
c, 8d, a part of the actuating part 8b is placed on the large diameter part 3a of the governor shaft 3, and a part of the operating part 8b is placed on the small diameter part 3.
The oil holes 11 and 12 are formed in the small diameter portion 3b, and communicate with the corresponding oil passages in the governor shaft 3.

In the above configuration, the governor shaft 3 is rotated by the drive of the drive gear 1, and the hydraulic valve in the governor body 4 is opened in response to centrifugal force based on the rotation, and the oil holes 11, 12 of the governor shaft 3 are opened.
The oil pressure inside the automatic transmission is controlled according to the vehicle speed via the corresponding internal oil passage. While the vehicle is moving forward, a thrust load is generated on the governor shaft 3 in the direction (upward in the drawing) from the governor shaft 3 toward the governor body 4 (based on the engagement between the drive gear 1 and the governor gear 2), but the operation of the governor pin 8 The engagement between the portion 8b and the large diameter portion 3a of the governor shaft 3 can prevent its displacement, and on the other hand, the thrust in the direction from the governor body 4 toward the governor shaft 3 (downward in the drawing) that occurs when the vehicle backs up The load is received by supporting the governor body 4 by one end 6a of the case 6.

[Problem that the invention attempts to solve]

However, according to the conventional governor mechanism of a vehicle automatic transmission, the rectangular operating portion 8b of the governor pin 8
The actuating portion 8b is configured to receive a thrust load in one direction by the actuating portion 8b, and the actuating portion 8b is formed such that its center coincides with the center 0 of the circular base portion 8a that rotates freely within the insertion hole 9. (Figure 2 C), the governor pin 8 may change its posture,
As a result, the edge of the actuating portion 8b may bite into the oil hole 11 (FIG. 2 d) and attempt to prevent rotation of the governor shaft 3 (FIG. 2 b). When this occurs, it engages with the drive shaft 1.
For example, the governor gear 2 made of copper alloy may wear out.

[Procedures and actions to solve problems]

The present invention has been made in view of the above, and in order to eliminate concerns about wear of the governor gear by suppressing the rotation of the governor pin, and thereby enable the governor gear to be formed of, for example, synthetic resin. To provide a governor mechanism for an automatic transmission for a vehicle, in which an operating part of a governor pin is provided with an arcuate surface inscribed in a case and a rectangular surface that engages with a governor shaft, and the center of the circular base and the center of the operating part are eccentric. It is something.

〔Example〕

The governor mechanism of the automatic transmission for vehicles according to the present invention will be explained in detail below.

FIGS. 1A to 1D show an embodiment of the present invention. 1st
In Figure A, the same parts as in Figure 2 are indicated by the same reference numerals, so duplicate explanations will be omitted.
The operating portion 8b of the governor pin has a circular arc surface 81 corresponding to the corresponding inscribed surface 6b of the case 6, and a small diameter portion 3b.
It has a rectangular surface 82 located within the groove. Arc surface 8
1 has substantially the same shape as the circular arc surface of the circular base 8a of the governor pin 8, but the square surface 82 has a shape similar to that of the circular base 8a of the governor pin 8.
A downward from the center O of a, B upward (A≠
B) and each dimension C in the right direction, and the dimension C is smaller than the radius R of the circular base 8a (C<R). The groove width D of the small diameter portion 3b is D=L+E. here,
L=A+B, and E is a gap formed on the operating portion 8b. Note that one surface of the rectangular surface 82 extends as 83 to a part of the first tip portion 8c. (1st
Figure C).

According to the above configuration, since the center O of the circular base 8a and the center O' of the actuating part 8b (this is more appropriately called the center of gravity) are shifted, the governor pin 8 is rotated around the center O. Even if the governor pin 8 attempts to rotate, the rotation is blocked, and since the circular arc surface 81 is likely to have its posture restricted by the inscribed surface 6b of the case 6, rotation of the governor pin 8 is prevented. Note that the point indicated by the distance P and Q in Fig. 1A is the governor pin 8.
This is the center position of the insertion hole 9 in , and the center O in FIG.
This is consistent with the following. In this way, when the position of the insertion hole 9 of the case 6 is determined by the dimensions P and Q, when changing the groove width D and the pin width L, the rectangular surface 81 can be simply processed accordingly. can be easily dealt with. According to this configuration, in order to prevent excessive force from being applied to the meshing portion between the drive gear 1 and the governor gear 2, the material of the governor gear 2 can be replaced from metal to synthetic resin.

[Effect of idea]

As explained above, according to the governor mechanism of the automatic transmission for vehicles of the present invention, the operating portion of the governor pin is provided with a circular arc surface inscribed in the case and a square surface that engages with the governor shaft, and Since the center of the actuating portion is eccentric, rotation of the governor pin can be suppressed, thereby allowing smooth rotation of the governor shaft.

[Brief explanation of the drawing]

Figures 1A to 2D show one embodiment of the present invention, where A is an overall view, B and C are explanatory diagrams of the governor pin, D is an explanatory diagram showing the relationship between the governor pin, the case, and the governor shaft, and Figure 2I is an explanatory diagram showing the relationship between the governor pin, the case, and the governor shaft. , D show a governor mechanism of a conventional automatic transmission for a vehicle, FIG. 2 A is an overall view, and FIGS. 2 B to D are explanatory diagrams showing a governor pin. Explanation of symbols, 1... Drive gear, 2... Governor gear, 3... Governor shaft, 4... Governor body, 5... Driven gear, 6... Case,
7...Cover, 8...Governor pin, 8b...Governor pin operating section, 9...Governor pin hole, 1
0...Occluded bolt, 11, 12...Oil hole, 13...
... Bracket, 14 ... Support, 15 ... Bolt, 81 ... Arc surface, 82 ... Square surface.

Claims (1)

[Scope of Claim for Utility Model Registration] A governor shaft having a governor gear that meshes with a drive gear, and a governor body provided at one end of the governor shaft and having a hydraulic valve whose opening degree changes according to centrifugal force. In the governor mechanism of a vehicle automatic transmission that performs hydraulic control according to vehicle speed based on the opening degree of the hydraulic valve, the case housing the governor shaft supports the governor main body at one end thereof, thereby controlling the governor shaft. The governor pin inserted into the insertion hole formed in the case is positioned in the groove formed in the governor shaft. The governor pin is configured to receive a thrust load acting in a direction opposite to the thrust load, and the portion of the governor pin located in the groove has an arcuate surface inscribed in the case and a rectangular surface that engages with the groove. A governor mechanism for an automatic transmission for a vehicle, characterized in that a center thereof is eccentric from the center of the governor pin.