JPS5841402Y2 - Control cable vibration prevention structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a new structure for blocking engine vibrations transmitted through a control cable when the control cable is used for remote power transmission in an automobile or the like.

A control cable consists of an inner wire that transmits operating power, and an outer casing that guides the inner wire and routes it freely, and is often used for remote control such as operating the parking brake, attaching/disengaging the clutch, and operating the accelerator. However, it is a well-known phenomenon that, especially when used for accelerator operation, engine vibrations are transmitted to the driver's seat via the inner wire, causing vibrations in the accelerator pedal and causing discomfort to the human body that should be avoided.

As shown in Figure 1, a known measure to eliminate the above discomfort is to drill an inner wire penetration hole 2 in the center of the inner wire 8 on the accelerator pedal side (operation side) near the terminal fitting 7 of the control cable for accelerator operation. In addition, a shock absorber 1 is provided, which is a short, small cylindrical rubber body having a window hole 3 passing through the inner wire penetration hole orthogonally to the inner wire penetration hole axis, and having a hemispherical convex portion integrally connected to the left side in the figure, that is, on the accelerator pedal side. and further fitting a bushing 5 adjacent to the buffer body 1, which has a spherical recess that fits into the hemispherical convex portion of the buffer body 1 and has a protruding leg 6 at the other end,
A structure is widely used in which the terminal fitting 7, the buffer body 1, and the bushing 5 are brought into contact with each other in the direction of the arrow shown in the drawing so that the terminal fitting 7, the shock absorber 1, and the bushing 5 are integrally connected, and the accelerator pedal end (not shown) is engaged and connected to the protruding leg 6.

In the above conventional configuration, the engine vibration transmitted through the inner wire 8 is damped by the elastic properties of the buffer body 1, but the buffer body 1 with the window hole 3 is When the weight exceeds 2 kg, the deformation of the inner wire in the axial direction becomes maximum, and the window hole 3 is compressed and tightly adhered, losing its elastic function, and the damping effect is significantly reduced, resulting in a phenomenon in which the pedal vibration rapidly increases.

That is, in a passenger car, when the engine speed exceeds 3500 R/M, vibrations rapidly increase, causing an extremely unpleasant feeling.

The present invention eliminates the technical deficiencies in the conventional structure described above, and provides a new vibration prevention structure that effectively blocks the mechanical vibrations of the engine, etc. that transmit the inner wire, prevents the above-mentioned unpleasant vibrations, and improves the feeling of driving a car. The purpose is to provide.

The following will be explained based on examples.

Figure 2A. B is a plan view showing an embodiment of the present invention; 7 is a pedal side terminal fitting of an accelerator control cable; 9 is a plan view showing an embodiment of the present invention;
5 is a rubber damper, and 5 is a bushing, which are integrally assembled by fitting or abutting each other in the direction of the arrow in the figure.

The rubber damper 9 has a three-dimensional shape of a hollow cylinder made of rubber with a front and rear circular shape in plan projection, and a hemispherical convex surface that fits loosely into the hemispherical recess of the bushing 50, as in the conventional configuration, at the left end in the figure;
A through-hole 11 into which the inner wire 8 is loosely inserted
Further, the right end face in the figure is a flat end face that comes into contact with the terminal fitting 7, and has an opening 12 concentric with the outer periphery of the rubber damper 9.

On the other hand, the hollow part of the rubber damper 9 is characterized by an internal structure in which a hollow part 10 is provided and formed concentrically in each cross section perpendicular to the axial direction of the inner wire 8 so as to surround the outer circumference of the inner wire 8. The specifications of the rubber damper 9 of this embodiment are diameter: 20mm, maximum length: 20mm,
Cavity 10: a double truncated spherical cavity with a diameter of 15 mm, the diameter of the opening 12: 6 mm, and the minimum thickness t of the local wall of the cavity: 2.5 mm.

In the above embodiment, when the end of the accelerator pedal is engaged and connected to the protruding leg 6 and applied to an actual vehicle, the accelerator pedal does not come into direct contact with the inner wire 8 that receives engine vibrations, and the rubber damper 9 intervenes to generate extremely effective vibrations. Enjoy the prevention effect.

That is, due to the presence of the peripheral wall constituting the cavity 10 of the rubber damper 9, the inner wire 8 and the inner wire 8
The vibration of the terminal fitting T which is integrally fixed to the terminal fitting T is elastically absorbed, and the received vibration of the inner wire system is significantly blocked by the rubber damper 9 as a boundary.

On the other hand, even if the accelerator pedal operating load exceeds the above 2 kg, the rubber damper 9 is easily compressed and deformed, elastically receiving and transmitting the load to the terminal fitting 7 without coming into close contact, and acting without losing its elastic vibration absorbing properties. do.

The above new configuration example and the above conventional components are wired under the same conditions in an actual vehicle, an oscillator is set at the engine engaging part of the inner wire to oscillate, and the other end of the inner wire, that is, the second
A vibration detector was installed at the engagement portion of the accelerator pedal end of the protruding leg 6 shown in the figure, and the vibration prevention effect was compared.

The results are as shown in Figure 6, and the product of the present invention showed a drastic reduction in sound pressure of about 40 dB at an engine speed of 4000 R/M, demonstrating a very remarkable effect.

The minimum thickness t of the peripheral wall of the cavity in the present invention is preferably in the numerical range of about 1.5 mm to 5 mm, and as shown in Figure 7, a similar effect is exhibited in the above numerical range, but there is no effect when it deviates from the above numerical value. is rapidly becoming rare.

Furthermore, the outer shape of the rubber damper 1 according to the present invention may be a spherical shape as shown in the third figure, a drum shape as shown in the fourth figure, etc. as required, and furthermore, a through hole 11 as shown in the fifth figure can be applied.
The manner in which the stepped portion 13 of the terminal fitting 7 is fitted to the terminal fitting 7 avoids direct engagement between the inner wire 8 and the rubber damper 9, and slightly increases the vibration prevention effect due to the mass effect of the terminal fitting 7, thereby further enhancing the effect of the present invention. This is a preferred application example to improve the performance.

Note that the opening 12 in the present invention is an opening that facilitates mold release during molding of a rubber damper, and has no direct meaning with this configuration.

In the above configuration of the present invention, the bush 5 means the end of the operating member of the inner wire 8 that engages with the terminal fitting 7, and the bush 5 is a specific example thereof.

As described above, this invention has an amazing vibration prevention effect, effectively prevents vibration and noise transmission through control cables in actual vehicles, eliminates unpleasant vibrations and noises, improves the sense of driving, and improves safety. It has usefulness such as contributing to sex.

[Brief explanation of the drawing]

Figure 1: Plan view of conventional configuration A1 AA' sectional view B1 2nd
Figure 2 Plan view A1 BB' sectional view B1 of one embodiment of the present invention
Figure 3: Plan view A1 of another embodiment CC' sectional view B1 Figures 4 and 5: Plan view of other embodiments, Figure 6: Vibration prevention effect measurement graph in actual vehicle routing, Figure 7: It is a graph for measuring the vibration prevention effect by changing the cavity peripheral wall thickness t. Explanation of symbols: 1...Buffer body, 2...Through hole, 3...Window hole, 5...Button,
6... Projection leg, 7... Terminal fitting, 8...
...Inner wire, 9...Rubber damper, 10...Cavity, 11...Through hole, 12...Opening, 13 ...This is the step part of the terminal fitting.

Claims (1)

[Scope of utility model registration request] It consists of a terminal device on the operation side of the inner wire, an operating member end that engages with the terminal device and operates the inner wire, and a rubber damper that is compressed by being impregnated with the terminal device and the operating member end; The rubber damper has a thin hollow three-dimensional shape having a hollow portion that encircles the outer periphery of the inner wire, and the inner wire is inserted into the center portion thereof, and the end of the operating member, the rubber damper, and the terminal fitting are , a vibration prevention structure for a control cable characterized by a structure in which adjacent parts are fitted or abutted to each other and are combined into one.