JPH0451248Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention combines a main transmission case and an auxiliary transmission case via an adapter case, and a shift and select lever shaft for the main transmission. This invention relates to a manual gear transmission that is inserted into the auxiliary transmission case from inside the case.

(Prior Art) In a manual gear transmission equipped with this type of sub-transmission, in which a floor shift type shift lever is arranged on the sub-transmission case side, the shift and select lever shaft is as described above. Thus, it is necessary to insert the adapter case from the inside of the adapter case that follows the main transmission case to the inside of the auxiliary transmission case. In other words, the shift and select lever shaft penetrates, for example, a bulkhead formed integrally with the adapter case at the joint between the adapter case and the auxiliary transmission case, and is supported by this bulkhead so as to be able to perform shift and select operations. There is.

Now, in order to maintain a stable support state of the shift and select lever shaft, it is necessary to ensure sufficient dimensions of the support portion in the axial direction of the shift and select lever shaft. Further, an oil seal must be provided at the support portion of the shift and select lever shaft in order to prevent the flow of lubricating oil between the inside of the main transmission case and the inside of the auxiliary transmission case.

The structure of the supporting part of the shift and select lever shaft mentioned above and the seal structure at that point are those in which a floor shift type shift lever is placed in an extension housing that follows the main transmission case or an adapter case that replaces it. Almost the same configuration is also adopted in (for example, Japanese Utility Model Application Publication No. 141250/1983).

(Problem to be solved by the invention) In order to maintain a stable supporting state in the support part of the shift and select lever shaft, as described above, the dimensions of the support part in the axial direction of the shift and select lever shaft must be It is necessary to secure sufficient space for the support part, and also space for installing the oil seal. This results in a significant increase in the overall length of the gear transmission, resulting in an increase in its weight and cost. Furthermore, when the total length of the gear transmission increases, it becomes necessary to change the mounting position of the gear transmission, which causes problems such as making it difficult to share the mounting system with other models.

Note that if the size of the support portion in the axial direction of the shift and select lever shaft is insufficient and the movement of the shift and select lever shaft becomes unstable, the operation feeling thereof will deteriorate.

The present invention aims to solve such problems.

(Means for solving the problems) In order to solve the above problems, the present invention is configured as follows.

For example, as shown in FIG. 1, a main transmission case 1 and a sub-transmission case 3 are connected via an adapter case 2. As shown in FIG. The shift and select lever shaft 10 for the main transmission is connected to the auxiliary transmission case 3 from inside the adapter case 2 by using a through hole 13 formed in a cylindrical shape that is continuous with the partition wall 7 of the adapter case 2. It is inserted inside.

Inside the through hole 13, there is a pair of support parts 14, 15 that support the shift and select lever shaft 10 at two points spaced apart from each other in the axial direction.
are placed. Moreover, both of these support parts 14,
An oil seal 16 is disposed between the through hole 13 and the outer circumferential surface of the shift and select lever shaft 10 to maintain oil tightness between the inner circumferential surface of the through hole 13 and the outer circumferential surface of the shift and select lever shaft 10.

(Function) According to the above configuration, the shift and select lever shaft 10 is maintained in a stable supported state by the pair of support parts 14 and 15 arranged at a constant interval in the axial direction. becomes. Therefore, shift and select lever shaft 1
The zero movement is always stable and smooth, and the operation feeling is good.

Further, the oil seal 16 maintains an appropriate oil tightness between the inside of the main transmission case 1 and the inside of the auxiliary transmission case 3 at the location where the shift and select lever shaft 10 is inserted. Since the oil seal 16 is installed using the space between the pair of support parts 14 and 15, the overall length of the gear transmission is not increased due to securing the installation space for the oil seal 16. It will be suppressed.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

First, in FIG. 2, which shows a partially cutaway manual gear transmission equipped with an auxiliary transmission, an adapter case 2 is connected to the rear side (right side of the drawing) of the main transmission case 1. , an auxiliary transmission case 3 is coupled to the further rear side of the adapter case 2. Note that this sub-transmission case 3 has a two-part structure consisting of a front case 3A and a rear case 3B.

The upper surface of the sub-transmission case 3 is formed integrally with the front case 3A and the rear case 3B,
A shift lever retainer 5 formed by combining both cases 3A and 3B is located.
A large spherical portion 6a of a main transmission shift lever 6 is spherically supported on the shift lever retainer 5 so as to be able to perform shift and select operations, as is generally well known.

As is clear from FIG. 1, which is a partially enlarged cross-sectional view of FIG. , a cylindrical through hole 13 is formed which continues along the left and right direction of the drawing. A shift and select lever shaft 10 is inserted through the through hole 13, and a shift and select lever 11 integrally formed at the left end thereof is located inside the adapter case 2. Further, the right end portion of the shift and select lever shaft 10 is located within the auxiliary transmission case 3, and a lever housing 12 is fixed thereto.

As shown in FIG. 2, a small ball portion 6b formed at the lower end of the shift lever 6 is spherically coupled to the lever housing 12 (ball joint). As a result, as the shift lever 6 is operated, the shift and select lever shaft 10 is shifted in the axial direction and selected in the direction around the axis.

In the through hole 13 formed in the partition wall 7 of the adapter case 2, support parts 14 and 15, which are exemplified by a bush for supporting the shift and select lever shaft 10, are provided. They are installed at regular intervals in the direction. Moreover, an oil seal 16 is installed between the support parts 14 and 15 to maintain oil tightness between the inner peripheral surface of the through hole 13 and the outer peripheral surface of the shift and select lever shaft 10. As a result, the oil seal 16 is inserted into the through hole 1.
It performs a sealing function between the adapter case 2 side at point 3, that is, the main transmission case 1 side and the auxiliary transmission case 3 side.

Note that the shift and select lever shaft 10 may be directly supported by the inner periphery of the through hole 13 of the partition wall 7 without using a bush for either one of the support parts 14 and 15. Furthermore, for the supporting parts 14 and 15, it is also possible to use, for example, slide ball bearings in addition to bushings.

In the above configuration, the axial sliding operation (shift operation) and the operation around the axis (select operation) of the shift and select lever shaft 10
is maintained in a stable state by the pair of support parts 14 and 15 arranged at a constant interval as described above. In addition, both of these support parts 14 and 15
This oil seal 1 is assembled by incorporating the above-mentioned oil seal 16 using the space between the
6 can provide a sufficient sealing function without significantly sacrificing the length of the adapter case 2 in the front-rear direction (the length in the left-right direction in the drawing).
This allows the lubricating oil in the main transmission case 1 and the lubricating oil in the sub-transmission case 3 to flow into each other through the through hole 13, or if these lubricating oils are of different types. , their mixing is prevented.

Further, in this embodiment, one support part 14, such as a bush, is first assembled into the through hole 13 from the right side of the adapter case 2, and then the oil seal 16 is installed, and then the other support part 15 is assembled. It is configured to incorporate a bushing etc. However, on the contrary, it may be replaced with a structure in which one support part 15 is assembled from the left side of the adapter case 2, and then the oil seal 16 and the other support part 14 are assembled in this order.

(Effects of the invention) As described above, in the present invention, since the oil seal is disposed inside the through hole and between the pair of support parts that support the shift and select lever shaft, the entire length of the gear transmission is Not only can the oil seal be provided without increasing the amount of noise, but the oil seal is less adversely affected by whirling or rattling of the shift and select lever shaft, and the lubricating oil in the case can be directly and This prevents a large amount from reaching the oil seal. As a result, excessive deformation of the oil seal is prevented, sufficient sealing performance can be ensured with a relatively simple seal structure, and costs can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an enlarged cross-sectional view of a part of a manual gear transmission equipped with an auxiliary transmission, and FIG. 2 is a sectional view of a manual gear transmission equipped with an auxiliary transmission. FIG. 2 is a partially cutaway side view of the transmission. DESCRIPTION OF SYMBOLS 1... Main transmission case, 2... Adapter case, 3... Sub-transmission case, 7... Bulkhead of adapter case, 10... Shift and select lever shaft, 13... Through hole in bulkhead, 14, 15 …
...Support part, 16...Oil seal.

Claims (1)

[Claim for Utility Model Registration] The main transmission case and the auxiliary transmission case are connected via an adapter case, and the shift and select lever shaft for the main transmission is inserted from inside the adapter case into the auxiliary transmission case. In a manual gear transmission equipped with an auxiliary transmission of the type described above, a through hole formed in a substantially continuous cylindrical shape on the partition wall of the adapter case and into which the shift and select lever shaft is inserted; A pair of support parts supporting the shift and select lever shaft at two points spaced apart from each other in the axial direction;
A manual gear transmission equipped with an auxiliary transmission, comprising an oil seal that maintains oil tightness between the inner peripheral surface of the through hole and the outer peripheral surface of the shift and select lever shaft.