JP2014070709A - Reverse gear structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverse gear structure restricting a shock action when it is engaged with an input gear while reducing tooth hammer.SOLUTION: A reverse gear structure of the present invention is a manual transmission type reverse gear structure. A resin gear is molded in a shape in which a gear on an input shaft is extended. A metallic gear is arranged at a location where a load is applied at the time of reverse shift and the resin gear is arranged at a location where no load is applied.

Description

The present invention relates to a reverse gear structure that suppresses shock when meshing with an input gear while reducing rattling noise.

In the reverse shift gear structure of a manual transmission (for example, Patent Document 1), in the case of the selective sliding type reverse gear structure, when the reverse gear meshes with two places of the input shaft and the counter shaft, a shock due to the collision of the gears occurs. It occurs twice and the shift feeling is bad.

On the other hand, in the reverse gear structure in which the reverse gear meshes with the input shaft and the counter shaft once, the shock when the input shaft meshes with the counter shaft is reduced once compared to the above configuration. On the other hand, in this configuration, the input gear and the idler gear always mesh with each other, and there is a problem that rattling noise is generated even when no load is applied to the reverse gear.

JP 2006-97864 A

The present invention has been created in view of the above problems, and does not generate a rattling sound even when the reverse gear is not loaded, and further provides a shock when the reverse gear meshes with the input shaft and the counter shaft. The object is to provide a suppressed reverse gear structure.

The present invention according to claim 1

The reverse gear structure of the present invention according to claim 1 is a position where the gear on the input shaft is extended, the resin gear is molded, and the load is applied at the time of the reverse shift, the metal gear is disposed and the load is not applied. Is the resin gear.

According to the present invention, when no load is applied to the reverse gear and when no load is applied to the idler gear, the idler gear meshes with the resin gear portion, so that it is difficult to generate rattling noise. Further, since the resin portion serves as a guide when shifted in reverse, it is possible to eliminate a shock when meshing with the input gear.

It is a schematic diagram of the 1st example of the conventional reverse gear structure. It is an example schematic diagram of the 2nd example of the conventional reverse gear structure. It is an example schematic diagram of the reverse gear structure example of the present invention.

First, in describing the reverse gear structure of the present invention, two examples of conventional reverse gear structures are listed and described.

<< Conventional Example 1 >>
FIG. 1 shows a schematic diagram of a first example of a conventional reverse gear structure 10. The torque of the input shaft 11 is transmitted to the counter shaft 12. A reverse gear 13 is attached to the input shaft 11, and a counter gear 15 is attached to the counter shaft 12. A reverse idler gear 14 for reversing the rotation is attached to an idler shaft (not shown), and the reverse idler gear 14 slides in the longitudinal direction of the input shaft 11 as indicated by an arrow.

At the time of non-reverse, the reverse idler gear 14 is located on the left side of the figure, and at the time of reverse, the reverse idler gear 14 slides on the right side of the figure. When the reverse idler gear 14 slides to the right, the reverse idler gear 14 meshes with the reverse gear 13 and the counter gear 15. As a result, the rotation of the input shaft 11 is reversed and transmitted to the counter shaft 12. As described above, the reverse idler gear 14 collides with the reverse gear 13 and the counter gear 15 at the time of meshing, so that two shocks occur and the shift feeling is poor.

<< Conventional Example 2 >>
Next, FIG. 2 shows a schematic diagram of a second example of a conventional reverse gear structure 20. The torque of the input shaft 21 is transmitted to the counter shaft 22, the reverse gear 23 is mounted on the input shaft 21, the counter gear 25 is mounted on the counter shaft 22, and the rotation reverses to the idler shaft (not shown). The reverse idler gear 24 is mounted in the same manner as the conventional example 1 in FIG. The reverse idler gear 24 also slides in the longitudinal direction of the input shaft 21 as indicated by an arrow. However, unlike the conventional example 2, the reverse gear 24 is different in that it extends in the longitudinal direction of the input shaft 21.

At the time of non-reverse, the reverse idler gear 24 is positioned on the left side of the figure, and at the time of reverse, the reverse idler gear 24 slides on the right side of the figure. As the reverse idler gear 24 slides to the right, the reverse idler gear 24 meshes with the counter gear 25. As a result, the rotation of the input shaft 21 is reversed and transmitted to the counter shaft 22 during reverse. In this configuration, the reverse idler gear 24 is always in mesh with the reverse idler gear 24 and the reverse gear 23 regardless of the sliding position. Therefore, the shock when the input shaft 21 and the counter shaft 22 are connected is reduced once compared to the case of the conventional example 1, but the load is applied to the reverse gear 24 because the input gear 21 and the reverse idler gear 24 are always meshed. A rattling sound is generated even when no noise is applied.

<Example of reverse gear structure>
Hereinafter, an example of the reverse gear structure of the present invention will be described in detail with reference to the drawings. First, FIG. 3 is a schematic diagram showing the present reverse gear structure example 30.

The torque of the input shaft 31 is transmitted to the counter shaft 32, the reverse gear 33 is attached to the input shaft 31, the counter gear 35 is attached to the counter shaft 32, and the rotation is reversed to the idler shaft (not shown). The reverse idler gear 34 is mounted in the same manner as the conventional examples 1 and 2 in FIGS. 1 to 2, and the reverse idler gear 34 also slides in the longitudinal direction of the input shaft 31 as indicated by the arrow. Here, in the case of the reverse gear structure 30, the reverse gear 33 is extended to form a resin gear 36. In the conventional example 2, the reverse gear itself is extended in the longitudinal direction, but the reverse gear structure has a structure in which the resin gear 36 abuts the reverse gear 33.

The resin gear 36 may be insert-molded on the input shaft 31 or may be fitted and attached later. Further, the resin gear 36 has a function of preventing rotation (slip prevention) by applying a knurling 37 or the like to the surface. Further, the resin gear 36 is not required to be connected to the reverse gear 33, and may be configured to have the same phase as the reverse gear 33.

At the time of non-reverse, the reverse idler gear 34 is located on the left side of the figure and meshes with the resin gear 36. During reverse, as shown by the arrow, the reverse idler gear 34 slides to the right in the figure, and the reverse idler gear 34 and the counter gear 35 are engaged. As a result, the rotation of the input shaft 31 is reversed and transmitted to the counter shaft 32 during reverse. In this configuration, since the reverse idler gear 34 is always in mesh with the reverse idler gear 34 and the reverse gear 33 regardless of the sliding position, the shock when the input shaft 31 and the counter shaft 32 are connected is conventional. It decreases once compared with the case of Example 1. On the other hand, the input shaft 31 and the reverse idler gear 34 are always meshed with each other, but at the time of non-reverse (when the reverse gear 34 is not loaded), one meshing portion is made of resin, so that generation of rattling noise is suppressed. Can do. The resin gear 36 is weaker than a metal gear, but in the present invention, it is not a problem because it is used during non-reverse when no load is applied.

As mentioned above, although embodiment and the concept about the reverse gear structure of the present invention have been described, the present invention is not limited to this, and it is within the scope of the spirit and teaching described in the claims and the description. Those skilled in the art will understand that other variations and improvements can be obtained.

30 Reverse gear structure 31 Input shaft 32 Counter shaft 33 Reverse gear 34 Reverse idler gear 35 Counter gear 36 Resin gear 37 Knurl

Claims (1)

Mold the resin gear by extending the gear on the input shaft,
A manual transmission reverse gear structure, wherein a metal gear is provided at a position where a load is applied during reverse shift, and the resin gear is provided at a position where the load is not applied.