JPS6023214Y2 - Transmission control lever vibration prevention device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration prevention device for a transmission control lever for operating an automobile transmission.

The control lever that operates the transmission of an automobile often resonates due to the vibrations caused by the rotation of the engine being transmitted through the transmission, giving the driver an unpleasant feeling.

As vibration prevention measures for such transmission control systems, various ideas have been proposed in the past, such as the
Publications such as Japanese Utility Model Publication No. 2-94626 (hereinafter simply referred to as Utility Publication) and Japanese Utility Model Publication No. 47-24817 (hereinafter simply referred to as Utility Publication) have been proposed.

The device proposed in the former patent application is to attach a damper weight to a control rod, eliminate the biasing force applied to the control rod by the gear shift lever (control lever) that occurs when the engine accelerates or decelerates, and This mechanism is designed to prevent gear slippage caused by relative displacement between the control rod 5 and the vehicle body support (fulcrum). The effect of damping the vibrations of the gear shift lever itself, which extends upward through the gear lever, is small. It is necessary to use a weight or to provide a new vibration isolator independent of the weight.

Next, the device devised in the latter publication divides the gear shift lever (control lever) into two parts, interposes a bushing having an outer cylinder between them, and uses the bushing to provide vibration and sound insulation for the gear shift lever. However, in order to improve the vibration and sound insulation effect of the gear shift lever, the gear shift lever was divided into two parts, which required more man-hours to assemble the gear shift lever than with a single gear shift lever. There is a risk that one of the two shafts may fall out.

The present invention takes the above-mentioned points into consideration, and at the same time, a steel (damper) weight is attached to the vibrating body through a part of the rubber, and the vibration is damped by resonating with the natural vibration of the vibrating body. It was devised with a focus on dynamic dampers.

It has been found that the vibrations that cause the most discomfort in the control lever are vibrations in the high frequency range of about 130 to 200 Hz that are propagated by the engine when the engine speed is 4000 to 6000 rpm, so in the present invention, In order to most effectively reduce the unpleasant vibrations of the control lever, an iron weight is attached to the outer periphery of a part of the rubber so that the natural frequency is the same as that of the control lever in the high frequency range. The present invention provides a vibration prevention device for a transmission control lever, in which a dynamic damper having a dynamic damper is attached to the control lever.

The structure of the present invention will be explained in detail below with reference to FIG. ing.

Reference numeral 5 designates a control lever having a spherical boss portion 6. The boss portion 6 is supported by the spherical sheet 2, passes through the through hole 4, and has one end 8 engaged with the shift shaft 7, and the other end is connected to the floor panel 10. The operating knob 9 extends through a hole 11 provided in the console assembly 12 and a hole 13 provided in the console assembly 12, respectively.

Numeral 14 is a rubber grommet that seals the hole 11 and grips the control lever 5 so that the movement of the control lever 5 can be followed.

Reference numeral 15 is a cylindrical dynamic damper provided approximately at the center of the control lever 5, which has a rubber part 16 on the inside and has a spring action, and is attached to the lever 5 by seizing or the like.

On the outside thereof is an iron weight part 17 press-fitted into the rubber part 16.

The dynamic damper 15 is designed to effectively prevent vibrations in the high frequency range from the engine to the control lever 5 when the engine speed is 4000 to 6000 r.
It has the same natural frequency as the natural frequency in the high frequency range of about 130 to 200 Hz that is propagated by the engine at pm.

Reference numeral 18 denotes a boot that covers the operation mechanism of the transmission and is made of leather or vinyl and is fixed by a clip 19 provided in the hole 13 so as to wrap around the control lever 5 and follow the movement of the lever.

With the above-described structure, the present invention allows vibrations from the engine to be propagated through the transmission case 1, shift shaft 7, etc., and furthermore, the vibrations from the engine are propagated through the transmission case 1, the shift shaft 7, etc., and the control lever 5 is further engaged with the shift shaft 7, one end of the control lever 5, and the pivot case of the transmission case 1. Control lever 5 from 3rd class
is propagated to.

However, when the propagated vibration reaches a high frequency region as the engine rotation increases, the dynamic damper 15 provided approximately at the center of the control lever 5 has the same natural frequency in the high frequency region from the engine to the control lever 5. Due to its natural frequency, the rubber portion 16 is subjected to a force in the opposite direction that is equal in magnitude to the vibration forcing force, thereby absorbing vibrations propagated to the control lever 5.

As mentioned above, an iron weight part is attached to the outer circumference of a part of the rubber, and a dynamic damper having the same natural frequency as the natural frequency in the high frequency region of the control lever is attached to the control lever. According to the invented transmission control lever vibration prevention device, by attaching the above-mentioned dynamic damper to the transmission control lever, high frequencies of about 130 to 200 Hz propagated from the engine when the engine speed is 4000 to 6000 rpm can be reduced. The vibration acceleration level of the control lever can be reduced by effectively absorbing the vibration in the area, and the exerciser does not feel uncomfortable.

As shown in the graph of actual measured values in Figure 2, the vibration acceleration level of the control lever in the device of the present invention is 130.
In the range of 4,000 to 6,000 rpm, the engine rotational speed at which high frequency vibrations of about 200 Hz are propagated is significantly smaller than that of the conventional system.

Actually, the vibration prevention device for the transmission control lever of the present invention is simply made by attaching an iron weight part to the outer periphery of a part of the rubber at an appropriate location of the control lever 5 by press-fitting or the like. It is highly practical as it has an extremely simple structure and exhibits excellent performance, as it only needs to be attached.

Furthermore, since the control lever of the present invention does not need to be separated, assembly requires less man-hours and there is no risk of it coming off during use, which has the effect of providing an inexpensive and reliable control lever.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of the transmission control lever vibration prevention device of the present invention, and FIG. 2 is a graph showing the vibration acceleration lever of the control lever depending on the engine speed. 1 Nidoran transmission, 5: control lever, 6
: Boss part, 9: Operation knob, 15: Dynamic damper,
16: Part of the rubber, 17: Weight part.

Claims (1)

[Scope of utility model registration request] A transmission control characterized in that an iron weight part is attached to the outer periphery of a part of the rubber, and a dynamic damper having the same natural frequency as the natural frequency in a high frequency region of the control lever is attached to the control lever. Lever anti-vibration device.