JPS6020824Y2 - Control cable vibration prevention structure - Google Patents

Description

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

The control cable is composed of an inner wire that transmits operating power and an outer casing that guides the inner wire through and is routed in a curved manner, and is often used for remote control such as operating the parking brake of a car, unlocking the hood lock, and attaching/disengaging the clutch. However, especially when used for clutch operation, engine vibrations and
It is widely known that noise is transmitted and generates so-called unpleasant sounds, which significantly impairs riding comfort and requires countermeasures.

Conventionally, as a countermeasure against this problem, there has been proposed a vibration isolation structure characterized in that the clutch portion yoke member to which the inner wire is connected is used as a damper weight, as described in Japanese Utility Model Publication No. 51-35862.
In addition, a transmission sound removal device has been proposed which is equipped with a cylindrical short and small mass body on the outer periphery of the outer casing as described in Japanese Utility Model Publication No. 53-23871, but the former is designed to block the vibration generation source for the inner wire by means of increasing the weight of the member. On the other hand, the latter is a vibration damping effect of the outer casing, which is fixed at both ends to the vehicle body frame and through which the inner wire is inserted and guided, and has a defect such that the direct vibration isolation effect of the inner wire is poor.

The present invention has been developed in view of the above, and includes a cylindrical mass body having an appropriate opening with respect to the outer periphery of the inner wire, which is inserted into the middle part of the exposed inner wire of the control cable, and a stopper is installed at a predetermined part of the inner wire. Provides a vibration prevention structure that effectively prevents vibrations transmitted through the inner wire by fixing and suppressing the axial displacement of the cylindrical mass body within an allowable range, and suppresses the unpleasant noise in the driver's cabin. The purpose is to

This will be explained below using examples.

1 to 6 show an embodiment of a control cable for clutch attachment/detachment operation to which the present invention is applied.

First, FIG. 1 shows a front view of the metal cylindrical mass body 3'.
is the intermediate portion of the exposed inner wire on the operated side of the control cable for clutch attachment/detachment operation, that is, the exposed inner wire between the operated side inner wire locking fitting 7 that is locked to the main part of the clutch and the outer casing terminal fitting 9. It is fitted and attached to approximately the middle part.

The cylindrical mass body 3 is made of a metal material such as carbon steel or zinc, has a penetration hole 4 in its center having a total gap of 1 to 2 mm with respect to the outer periphery of the inner wire 1, and has an appropriate mass. It is a cylindrical body with an outer diameter and a length 11, and its axial cross section is circular or polygonal as shown in the second and third figures.

Furthermore, in order to suppress the relative positional displacement of the cylindrical mass body 3 with respect to the inner wire 1 in the axial direction within an allowable range during vibration prevention in an actual vehicle, the length of the cylindrical mass body 3 is approximately 5 mm longer than the length 1 □ of the cylindrical mass body 3. Two stoppers 5 having openings 2 are fixedly attached to the inner wire 1 by press caulking, guid cast casting, or the like.

The specifications in this example are the exposed inner wire length L
: 4001'f (when the control cable is not operated), stopper gap 12 : 255mm (carbon steel short annular body press swaged), cylindrical mass body length 11
: 250I hair, outer diameter D: 101 hair hollow cylinder, inner diameter d
It is a carbon steel cylindrical body of 2:4 mm (outer diameter d1:3 mm of the inner wire 1 to be fitted) and has a mass of about 130 g.

The wiring configuration is as shown in FIG. 6. The outer casing 2 is wired in a curved manner, and the terminal fittings 8 and 9 at both ends thereof are respectively attached to main parts of the continuous frame 10. The wire 1 is connected to the operating side locking metal fitting 6 at the upper part of the figure, which engages and connects to a clutch petal (not shown), and further, the operated side locking metal fitting 7 at the lower side of the figure, which engages and connects to the main part of the clutch (not shown). Provides remote control function for attaching and detaching.

On the other hand, the cylindrical mass body 3 is mounted approximately at the center of the exposed portion of the inner wire 1 on the operated side based on the above configuration.

In the above wiring and configuration, engine rotational vibration is transmitted to the inner wire on the operated side via the main parts of the clutch, but in the conventional configuration without the cylindrical mass body 3, the rotational vibration of the engine is transmitted to the inner wire near the center of the exposed inner wire span. The amplitude increases, and after that, a vibration sound spreads widely to the driver's seat via the control cable system using the inner wire 1 as a medium. Depending on the inner diameter free gap of the cylindrical mass body 3, the inner surface of the cylindrical mass body 3 repeatedly causes frequent collisions with the outer circumference of the inner wire 1, and the vibration energy of the inner wire 1 is converted into the kinetic energy of the cylindrical mass body 3. This acts as a so-called dynamic damper, and subsequent vibrations in the control cable mooring are damped extremely significantly.

In the wiring configuration shown in FIG. 6 of this embodiment, the inner wire 1 is oscillated by attaching an exciter to the locking metal fitting 7, and the locking metal fitting 6 at the other end
The result of actually measuring the composite displacement in the X direction and the Y direction (Z direction in the diagram) in the vicinity A of is shown in the following table, and the structure of the present invention showed a clear vibration-proofing effect.

In addition, as a more preferred embodiment of the present invention, the structure shown in FIG.
It is characterized by a structure in which a thin elastic body 3' with a thickness of 5 mm to 1.5 mm is interposed, and when used, the inner wire 1
The vibrational energy is absorbed primarily as elastic energy of the elastic body 3' and secondarily converted and absorbed as kinetic energy of the cylindrical mass body 3, and its vibration suppressing effect is extremely effective.

As yet another embodiment, the structure shown in FIG. 5 is an embodiment in which the cylindrical mass body 3 is a known metal interlocking body made by knitting thin metal wires and compressing them to a predetermined density. Like the former, the elastic energy of the metal coupling body and the kinetic energy of the cylindrical mass body provide a remarkable vibration prevention effect.

The vibration damping effect of the two embodiments was demonstrated in a comparative test under the same conditions as those of the above-mentioned Example, as it showed "maximum combined displacement at A≦10XIO-4 mm", proving its remarkableness.

As described above, the present invention extremely effectively suppresses and interrupts transmission of vibrations from the engine, etc. through control cables in automobiles, etc., thereby eliminating unpleasant noises in automobile driving and passenger seats, and is useful for improving ride comfort. It is effective.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of the present invention, Figs. 2 and 3 are sectional views at A and A' thereof, Figs. 4 and 5 are front views showing other embodiments of the invention, and Fig. 6 is a front view of an embodiment of the present invention. It is a wiring form diagram of an Example. Explanation of symbols, 1: Inner wire, 2: Outer casing, 3: Cylindrical mass body, 3′ bielastic body, 4: Penetration hole, 5
: Stopper 6, 7: Locking metal fitting, 8, 9: Terminal metal fitting,
10: Vehicle body frame.

Claims (3)

[Scope of utility model registration request] (1) A cylindrical mass body having an appropriate gap with the outer periphery of the inner wire is fitted into the exposed inner wire intermediate portion of the control cable, and a stopper is provided on the inner wire to limit the axial displacement of the cylindrical mass body. The vibration prevention structure of the control cable is characterized by: (2) The vibration prevention structure for a control cable according to item (1), characterized by having a structure in which a cylindrical mass body having a thin elastic body is inserted into the inner peripheral surface. (3) The vibration prevention structure for a control cable according to item (1), characterized by a structure in which a cylindrical mass body made of a metal entangled body is inserted.