JPH085415Y2 - Gear shift mechanism of transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a gear shift mechanism of a transmission.

(Prior Art) As a gear shift mechanism of a transmission, for example, one configured as shown in FIG. 2 is known (Japanese Utility Model Laid-Open No. 64-43429).

Reference numeral 1 is an inner shaft rotatably supported by a control cover 2, 3 is a shift lever spline-fitted to the outer periphery of the inner shaft 1 through a boss portion 3A, and 4 is a select lever 5 rotatably (swinging) supported. With the select shaft, the select shaft 4 is inserted into the shaft hole 6 of the control cover 2, the select lever 5 is coupled to the tip protruding inside the cover 2, and the C clip 8 does not come off outside the cover 2 via the washer 7. To be supported. Reference numeral 9 indicates an oil seal.

When the select shaft 4 rotates during the gear shift operation, the shift lever 3 is moved through the select lever 5.
Slides on the inner shaft 1 (select operation), and when the inner shaft 1 rotates at the selected position, the shift lever 3 swings (shift operation).

(Problems to be solved by the invention) By the way, in such a conventional example, the select shaft 4
Further, since the weight of the select lever 5 acts on the surface of the clip 8, there is a problem that sliding resistance is large and good select operability cannot be obtained.

(Means for Solving the Problem) In order to solve such a problem, the present invention has a select shaft having a select lever fixed to a lower end thereof and vertically penetrates a cover attached to an upper surface of a transmission case. A transmission gear shift mechanism including a shift lever that is inserted into a formed shaft hole from below to rotatably support the select shaft and that is provided with a shift lever that slides in the select direction along the inner shaft when the select lever rotates. The lower end of the select shaft is supported in point contact with the upper surface of the transmission case facing the lower end.

(Operation) The weight of the select shaft and the select lever is supported by the transmission case, which comes into point contact with the tip of the select shaft. Therefore, the sliding resistance generated by the weight of the select lever or the like accompanying the rotation of the select shaft is almost eliminated, and good select operability can be obtained.

(Embodiment) In FIG. 1, 10 is a shift lever that is spline-fitted to an inner shaft 11, and the shift lever 10 slides on the inner shaft 11 via the select lever 13 by the rotation of the select shaft 12 as before. (Select operation),
The inner shaft 11 swings (shifts) by the rotation of the inner shaft 11.

Select shaft 12 has shaft hole 15 in control cover 14.
And the select lever 13 is coupled to the tip protruding inside the cover 14. In this case, the tip side of the select shaft 12 penetrates the select lever 13 and is further extended.
A spherical shape portion 17 is formed at the tip of the transmission case 16 as a supporting surface, which is in point contact with the supporting surface. 18 is an oil seal, 19 is a dust cover, and 20 is a shift lever
The lock pin mechanism for 10 select positioning is shown.

With this configuration, the weight of the select shaft 12 and the select lever 13 is the transmission case in which the spherical shape portion 17 at the tip of the select shaft 12 makes point contact therewith.
Supported by 16. Therefore, select shaft 12
Since there is almost no sliding resistance generated by the weight of the select lever 13 or the like due to the rotation of, the good select operability can be obtained. Further, the washer and the C-clip for preventing the select shaft 12 from coming off are unnecessary.

The tip portion 17 of the select shaft may have any shape as long as it makes point contact with the transmission case 16.

(Effect of the Invention) In short, according to the present invention, the lower end of the select shaft rotatably supported by the cover of the transmission is supported by point contact with the upper surface of the transmission case facing the lower end. Sliding resistance generated by the weight of the select lever and the like accompanying the rotation of the select shaft is almost eliminated, and good operability can be obtained. In addition, parts for preventing the select shaft from falling off the cover are not required, which is advantageous in terms of workability in assembling and cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional device. 10 …… Shift lever, 11 …… Inner shaft, 12 …… Select shaft, 13 …… Select lever, 14 …… Cover, 15 …… Shaft hole, 16 …… Transmission case, 17
...... Spherical shape part.

Claims (1)

[Scope of utility model registration request] 1. A select shaft having a select lever fixed to its lower end is inserted from below into a shaft hole formed by vertically penetrating a cover attached to the upper surface of a transmission case, so that the select shaft can freely rotate. In a gear shift mechanism of a transmission, which is provided with a shift lever that supports and slides in the select direction along the inner shaft when the select lever rotates, in a transmission case upper surface part that faces the lower end part of the select shaft. A gear shift mechanism for a transmission characterized in that it is supported by point contact with.