JPH1148811A - Shift lever - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shift lever wherein vibrations due to resonance are hard to happen and lateral rigidity is high. SOLUTION: A cylindrical attachment part 22 of a grip is attached to an upper end of a shaft 21 via upper/lower two rubber insert parts 28, 23. The upper rubber insert part 28, equipped with a bush 30 on an inner surface of a cylindrical insert rubber 29, is structured such that the shaft 21 can slide thereon axially. As a result, an axial spring characteristic of the upper rubber insertion part 28 can be unlimitedly lowered, and resonance is prevented by shifting a resonance frequency from a normal use frequency to a lower frequency zone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift lever for an automobile, and more particularly to a floor shift type shift lever.

[0002]

2. Description of the Related Art A shift lever of an automobile has a handle attached to an upper end of a shaft. In order to prevent vibration from an engine or the like from being transmitted to a driver's hand, a base of the handle is formed in a cylindrical shape. A structure is employed in which this cylindrical mounting portion is mounted on the upper end of a shaft via a rubber insert.

FIG. 3 is a view showing an example of the above-mentioned conventional structure. Reference numeral 1 denotes a shaft, and reference numeral 2 denotes a tubular mounting portion of a handle. Two upper and lower rubber inserts 3 and 4 are provided between the shaft 1 and the cylindrical mounting portion 2 so that vibration from the shaft 1 is not directly transmitted to the handle. Each of these rubber inserts 3 and 4 includes cylindrical insert rubbers 5 and 6, the inner surface of which is bonded to the shaft 1 with an adhesive, and the outer surface of which is bonded or press-fitted to the cylindrical mounting portion 2. Has become. However, such a shift lever has a high spring characteristic and does not sufficiently attenuate the vibration, so that, for example, when the air conditioner is turned on and the engine speed is increased, the shift lever may vibrate violently due to resonance.

Therefore, as shown in FIG. 4, a shift lever having a modified rubber insert structure has been developed. In the shift lever of FIG. 4, the lower rubber insert portion 7 includes a metal inner sleeve 8 adhered to the shaft 1 and a metal outer sleeve 9 that is in close contact with the inner surface of the cylindrical mounting portion 2. The structure between them is connected by a disk-shaped insert rubber 10. An annular stopper 11 is fitted into the annular concave portion of the insert rubber 7 so as not to fall off the shaft 1.

The upper rubber insert 12 has a flange-shaped inner sleeve 14 inside a ring-shaped insert rubber 13, the inner sleeve 14 is bonded to the shaft 1, and the outer side of the insert rubber 13 is attached to a cylindrical mounting portion. 2 has a structure fitted into an adhesive.

In the shift lever of FIG. 4, the spring characteristics of the rubber inserts 7, 12 are greatly reduced as compared with the shift lever of FIG. 3, so that the vibration level value in a normal use range can be reduced. However, the engine speed is 2500
When the rotation speed is increased to about rpm, there is a problem that fine chattering occurs.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems and to provide a shift lever which is less likely to generate vibration due to resonance even when the engine speed is increased, and has high lateral rigidity. It was done in.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention is directed to a shift lever in which a cylindrical attachment portion of a handle is attached to an upper end of a shaft through two upper and lower rubber insert portions. The lower rubber insert has a structure in which the inner sleeve and the outer sleeve are connected by a disc-shaped insert rubber, and the upper rubber insert has a bush on the inner surface of the cylindrical insert rubber.
The structure is such that the shaft can slide in the axial direction inside the bush.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. In FIG. 1, reference numeral 21 denotes a shaft similar to the conventional one, and reference numeral 22 denotes a cylindrical attachment part of the same handle as the conventional one. Between these shafts 21 and the cylindrical mounting portions 22,
Rubber inserts are provided at several locations.

[0010] Of these rubber inserts, the lower rubber insert 23 is the same as the conventional rubber insert 7 shown in FIG. 4, and includes a metal inner sleeve 24 bonded to the shaft 21 and a cylindrical mounting. An outer sleeve 25 made of metal is provided in close contact with the inner surface of the portion 22, and has a structure in which the outer sleeve 25 is connected by a disc-shaped insert rubber 26. An annular stopper 27 is fitted in the annular concave portion of the insert rubber 26. In addition, insert rubber 2
The inside of 6 is closely attached to the outer periphery of the inner sleeve 24, and is fixed with an adhesive. In this manner, the lower rubber insert portion 23 elastically supports the cylindrical mounting portion 22 on the shaft 21 via the disc-shaped insert rubber 26.

The upper rubber insert 28 has a bush 30 made of resin or metal with a flange on the inner surface of a cylindrical insert rubber 29. The inner diameter of the bush 30 is slightly larger than the outer diameter of the tip portion 31 of the shaft 21 so that the shaft 21 can slide in the axial direction inside the bush 30. Both the insert rubber 26 and the insert rubber 29 are made of rubber having a hardness of about 40 to 60 and low spring characteristics.

In the shift lever of the present invention thus constructed, the lower portion of the cylindrical mounting portion 22 is provided on the shaft 2 via the disk-shaped insert rubber 26 of the lower rubber insert portion 23.
1 and an upper portion of the cylindrical mounting portion 22 is supported so as to be able to slide in the axial direction with respect to the shaft 21. Thus, the axial spring characteristics of the upper rubber insert portion 28 can be reduced as much as possible, and the axial spring characteristics of the shift lever itself can be reduced by lowering the spring characteristics of the lower rubber insert portion 23. Can be kept low. As a result, FIG.
As shown in the graph, the resonance frequency is shifted from the normal use frequency to the low frequency range, and even when the engine speed increases, the vibration due to the resonance hardly occurs.

Further, since the bush 30 is provided between the upper end of the shaft 21 and the upper part of the cylindrical mounting portion 22, the lateral force for operating the handle is not changed.
And a high sense of rigidity can be obtained.

[0014]

As described above, the shift lever of the present invention is less susceptible to vibration due to resonance and has high rigidity even when the engine speed is increased.
This is a high value shift lever that solves the conventional problems.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a shift lever of the present invention.

FIG. 2 is a resonance frequency characteristic diagram of a shift lever.

FIG. 3 is a sectional view showing a conventional shift lever.

FIG. 4 is a sectional view showing another conventional shift lever.

[Description of Signs] 1 Shaft in conventional technology 2 Cylindrical mounting portion of handle 3 Rubber insert portion 4 Rubber insert portion 5 Cylindrical insert rubber 6 Cylindrical insert rubber 7 Lower rubber insert portion in other conventional technologies 8 Inner Sleeve 9 Outer sleeve 10 Disc-shaped insert rubber 11 Stopper 12 Upper rubber insert 13 Ring-shaped insert rubber 14 Inner sleeve 21 Shaft in the present invention 22 Handle cylindrical attachment 23 Lower rubber insert 24 Metal inner Sleeve 25 Metal outer sleeve 26 Disc-shaped insert rubber 27 Stopper 28 Upper rubber insert part 29 Cylindrical insert rubber 30 Resin or metal bush 31 Shaft tip

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Katayama 4630 Yagarashi-no-Machi, Kurashiki-shi, Okayama Prefecture Inside Kurashiki Chemical Co., Ltd. Inside Kurashiki Kako Co., Ltd. (72) Inventor Hitoshi Fukuda 4630, Yagarashi-no-machi, Renjimajima-cho, Kurashiki-shi, Okayama Prefecture Inside Kurashiki Chemical Co., Ltd. Inside the corporation

Claims (1)

[Claims] 1. A shift lever in which a cylindrical attachment portion of a handle is attached to an upper end of a shaft via two upper and lower rubber insert portions, wherein a lower rubber insert portion is a circle between an inner sleeve and an outer sleeve. The shift is characterized in that it is connected by a plate-shaped insert rubber, the upper rubber insert is provided with a bush on the inner surface of the cylindrical insert rubber, and the shaft can slide in the axial direction inside the bush. lever.