JPH08159248A - Vibration preventing device for shift lever - Google Patents

Abstract

PURPOSE: To suppress the generation of vertical vibration of a shift lever, namely, production of a thrust sensation by a method wherein a measure is attached in a vertical vibrating state to a bracket supporting a shift lever and attached in such a state to be extended to a position below the shift lever of the rear extension part of a transmission case. CONSTITUTION: In a transmission 12, a shift lever 16 is disposed to a rear end 13a extending to the rear approximately in parallel to the output shaft 14 of a transmission case 13. A dynamic damper 20 is mounted on the under surface of the rear end 13a of the transmission case 13 in such a state to be positioned below the shift lever 16. The dynamic damper 20 consists of an inverted U-shaped bracket 21, a measure 22, and a resilient member 23. The measure 22 is supported between the two end parts 21c and 21c of the bracket 21 and with this state, the measure is supported between the two end parts 21c and 21c by a resilient member 23. The bracket 21 is arranged on the under surface of the rear end 13a of the transmission case 13 and in a position below the shift lever 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration preventing device for a transmission shift lever.

[0002]

2. Description of the Related Art A shift lever for controlling a transmission of a vehicle vibrates due to engine vibration, and a driver receives vibration during a shift operation, which is uncomfortable. In particular, the direct structure, in which the transmission and the shift lever are directly connected via a shift fork, a fork shaft, a shift & select lever, etc., does not allow the shift lever push-up direction in the casing extension portion (nose portion) of the transmission shift lever. The vibration is so great that the driver feels a thrust from the shift lever. As a method of suppressing the vibration of the shift lever, it is common to provide a weight on the shift lever, and for example, an actual flat plate 5-30
No. 606 and Japanese Utility Model Laid-Open No. 4-92430.

In the technique disclosed in Japanese Utility Model Laid-Open No. 5-30606, a small mass 4 is attached to and detached from a rear end of a support rod 2 supporting a shift lever 1 of a transaxle via a support bolt 3 as shown in FIG. A plurality of small masses 4 are increased or decreased depending on the vibration isolation effect of the shift lever 1 and the engine specifications so that the masses are shared and unnecessary weight is not increased. In addition, the actual Kaihei 4-924
The technique disclosed in Japanese Patent Publication No. 30 is such that, as shown in 2, the assist boot 7 that covers the support portion of the shift lever 5 is attached to the mass 6 provided on the shift lever 5, and the vehicle with the noise generated in the lower part of the vehicle body is mounted. It is designed to prevent entry into the room.

[0004]

However, in each of the above-mentioned conventional devices, a mass is added to the shift lever to suppress the vibration acting on the shift lever. Therefore, the mass to be added is increased. Is difficult to achieve, and
Since the installation location is restricted, the vibration damping effect cannot be sufficiently exerted in the casing extension portion to which the transmission shift lever is attached. This is because the transmission is generally supported by the engine mount and the mission mount, and the amplitude of the vibration greatly changes even when the engine speed fluctuates, which makes it difficult to control the phase of the amplitude. For this reason, there is a problem that it is difficult to suppress the vibration in the thrusting direction that acts on the shift lever.

The present invention has been made in view of the above-mentioned points, and a vibration preventing device for a shift lever for suppressing the vibration of the extension of the transmission case for mounting the shift lever of the transmission to prevent the shift lever from being pushed up. The purpose is to provide.

[0006]

In order to achieve the above object, according to the present invention, there is provided a transmission case supporting a shift lever at a rear end of a transmission case extending rearward substantially parallel to an output shaft of a transmission. The rear extension is provided with a bracket that is attached to the lower surface of the shift lever below the shift lever so as to project laterally, and a mass that is attached to the bracket so as to be vertically vibrable via an elastic member.

According to a second aspect of the present invention, one side of the bracket is fixed to a lower surface of a rear extension of the mission case,
The other side is projected laterally to serve as a mass support portion. According to a third aspect of the present invention, the bracket has a central portion fixed to a lower surface of a rear extension portion of the mission case, and both side portions protruding leftward and rightward to form a mass support portion.

According to a fourth aspect of the present invention, the front and rear ends of the mass supporting portion of the bracket are bent downward to form a substantially inverted U shape.
The mass is supported between the front and rear side surfaces via the elastic member. According to a fifth aspect of the present invention, the mass is provided on the bracket so as to be spaced apart along a drive shaft connected to the output shaft.

[0009]

[Operation] The engine case vibrates the mission case, and the rear end part vibrates vertically. The mass, which is supported by the bracket so as to be able to vibrate vertically via an elastic member, vibrates in the vertical direction in response to the vibration of the rear end portion, and suppresses the vertical vibration of the rear end of the mission case. As a result, the vertical vibration of the shift lever, that is, the feeling of thrusting up is suppressed, and the feeling during the shift operation is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 3 shows an outline of a main part of a vehicle to which the present invention is applied. The engine 11 and the transmission 12 of the vehicle 10 are mounted on a vehicle body (neither is shown) via an engine mount and a transmission mount, respectively, The output shaft 14 of the transmission 12 extends rearward from the transmission case 13 and is connected to the drive shaft 15. A shift lever 16 is provided at a rear end (nose portion) 13a extending rearward substantially parallel to the output shaft 14 of the mission case 13. This shift lever 1
A direct structure 6 is connected to the transmission 12 via a shift fork, a fork shaft, a shift & select lever (neither is shown), or the like.

On the lower surface of the rear end 13a of the transmission case 13, a dynamic damper 20 is mounted below the shift lever 16 as shown in FIGS. As shown in FIG. 7, the dynamic damper 20 includes a bracket 21, a mass 22, and an elastic member 23. The bracket 21 has one side portion 21a as a mounting portion and a plurality of bolt holes 21d at both front and rear ends. The front and rear end portions 21c, 21c of the other side portion 21b are bent downward at right angles to form an inverted U-shape. The bracket 21 is formed by pressing a metal plate.

The mass 22 is formed on both ends 21 of the bracket 21.
It is arranged between c and 21c, and is supported by the elastic member 23 at both ends 21c and 21c. Elastic member 2
3 is made of, for example, a rubber member, and is vulcanized and adhered to the front and rear end surfaces and the upper surface of the mass 22, and the front and rear end surfaces are vulcanized and adhered to the inner surfaces of the front and rear end portions 21c and 21c of the bracket 21, respectively. ing. Further, a slight gap 24 is provided between the upper surface of the elastic member 23 and the lower surface of the bracket 21. In this way, the mass 22 is supported between the front and rear ends 21c, 21c of the other side 21b of the bracket 21 so as to be capable of vibrating in the vertical direction (arrow direction). Square 2
The mass of 2 and the spring constant of the elastic member 23 are set according to the vibration frequency to be suppressed. Therefore, the range of tuning applied to the transmission main body becomes wider, and it is possible to set a specific frequency (attenuation band) according to the specifications of the engine, and an optimum damper effect can be obtained.

The bracket 21 is shown in FIGS.
As shown in FIG. 1, the lower side of the rear end 13 a of the transmission case 13 is arranged below the shift lever 16, and the one side 21
a is firmly fixed by the bolts 25 through the bolt holes 21d, the other side portion 21b projects to one side, for example, the left side, and both end portions 21c and 21c are the mission case 13.
Is installed along the front-back direction. And the cell 22 is
It is arranged in parallel with the drive shaft 15 at a slight distance, and can vibrate vertically.

The operation will be described below. The vibration generated in the engine 11 is transmitted to the transmission 12, the transmission case 13 vibrates accordingly, and the rear end 13a vertically vibrates. The dynamic damper 20 suppresses the vertical vibration of the mission case 13 due to the vertical vibration of the mass 22 as the rear end 13a of the mission case 13 vertically vibrates. This allows the shift lever 1
The vertical vibration of 6, that is, the thrust vibration is suppressed.

FIG. 8 shows an example of lever vertical vibration characteristics (secondary component frequency-acceleration characteristics) in the arrow direction at a measurement point A near the knob 16a (FIG. 4) of the shift lever 16. In FIG. 8, a curve I shows the characteristics when the dynamic damper is not mounted, and a curve II shows the characteristics when the dynamic damper 20 of the present invention is mounted. If the dynamic damper is not installed, vertical vibration (acceleration) occurs when the engine speed becomes high (for example, over 4000 rpm).
Exceeds the allowable level (feeling), causing discomfort. On the other hand, when the dynamic damper 20 is mounted, the vertical vibration is suppressed below the permissible level even when the engine speed becomes high, and the feeling during the shift operation is improved. The allowable level is set based on the feeling of many passengers.

FIG. 9 shows another embodiment of the dynamic damper. The dynamic damper 26 includes a dynamic damper 20 on both left and right side portions 27a and 27b of a bracket 27.
Similar to (FIG. 7), the masses 28, 28 are respectively provided with elastic members 29,
It is provided through 29 and is configured in a gate type. And
The central portion 27c is fixed to the lower surface of the rear end portion 13a of the transmission case 13 via bolt holes 27d, and the masses 28, 28 are arranged on both left and right sides of the drive shaft 15. By arranging the masses on both the left and right sides of the drive shaft in this manner, it is possible to increase the mass of the large mass even in a space-constrained place. In terms of action and effect,
This is the same as the bracket 21 shown in FIG. 7 in which the mass 22 is provided on one side.

[0017]

As described above, according to the present invention, the shift of the rear extension portion of the transmission case supporting the shift lever at the rear end of the transmission case extended rearward substantially in parallel with the output shaft of the transmission. By providing a bracket that is attached to the lower surface below the lever so as to project laterally and a mass that is attached to the bracket so as to be able to vibrate in the vertical direction via an elastic member, a mission case that vibrates due to engine vibration can be provided. The vertical vibration of the rear end can be suppressed, and the feeling of pushing up the shift lever supported at the rear end of the transmission case can be suppressed, thus improving the feeling. Also,
By attaching to the lower surface of the rear end of the mission case,
The range of tuning can be expanded by changing the shape and changing the mass of the mass and the spring constant of the elastic member, and the degree of freedom of layout can be increased.

According to the second aspect of the present invention, one side of the bracket is fixed to the lower surface of the rearward extension of the mission case, and the other side of the bracket extends laterally to form a mass supporting section, which simplifies the structure. In claim 3, the central portion of the bracket is fixed to the lower surface of the rearward extension of the mission case, and the both sides of the bracket extend to the left and right to form a mass support portion, so that a narrow space is effectively used. Then, it is possible to set the mass of the mass to be heavy.

According to a fourth aspect of the present invention, the mass support portion of the bracket is bent downward at both front and rear ends to form a substantially inverted U shape, and the mass is supported by elastic members between the front and rear side surfaces of the bracket. The mass is easily supported. According to the fifth aspect, since the mass is provided on the bracket along the drive shaft connected to the output shaft, the mass can be effectively arranged in a narrow space.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a conventional vibration preventing device for a shift lever.

FIG. 2 is a cross-sectional view of a main part of a conventional vibration preventing device for a shift lever.

FIG. 3 is a configuration diagram of a main part of a vehicle to which a vibration preventing device for a shift lever according to the present invention is applied.

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a plan view of FIG.

FIG. 6 is an end view of FIG.

7 is a perspective view showing a first embodiment of a dynamic damper which constitutes the vibration prevention device of FIG.

FIG. 8 is a characteristic diagram of vertical vibration of a shift lever to which the present invention is applied.

9 is a perspective view showing a second embodiment of the dynamic damper which constitutes the vibration prevention device of FIG.

[Explanation of symbols]

 10 Vehicle 11 Engine 12 Transmission 13 Transmission Case 14 Output Shaft 15 Drive Shaft 16 Shift Lever 20, 26 Dynamic Damper 21, 27 Bracket 22, 28 Mass 23, 29 Elastic Member

Claims (5)

[Claims] 1. A lateral extension on a lower surface below a shift lever of a rear extension of the transmission case supporting a shift lever at a rear end of a transmission case extending rearward substantially parallel to an output shaft of a transmission. An anti-vibration device for a shift lever, comprising: a bracket to be attached; and a mass attached to the bracket so as to be vertically vibrable via an elastic member. 2. The shift lever according to claim 1, wherein one side of the bracket is fixed to a lower surface of a rear extension of the mission case, and the other side of the bracket extends laterally to serve as a mass support portion. Anti-vibration device. 3. The shift according to claim 1, wherein a central portion of the bracket is fixed to a lower surface of a rearward extension portion of the mission case, and both side portions of the bracket extend laterally to form a mass support portion. Anti-vibration device for lever. 4. The mass support portion of the bracket has a substantially inverted U shape with both front and rear ends bent downward, and supports the mass through the elastic member between the front and rear side surfaces. The vibration preventing device for a shift lever according to claim 2 or 3, characterized in that: 5. The shift lever according to claim 1, wherein the mass is provided on the bracket along a drive shaft connected to the output shaft. Anti-vibration device.