JPH01279132A - Vibration prevention device for control cable system - Google Patents

Abstract

PURPOSE:To reduce the loss of strokes in a control cable by installing one dynamic damper formed of an elastic body on one of the component parts of the control cable. CONSTITUTION:In a control cable system, if vibration from a vibration source is added to a control cable, a dynamic damper D make such a movement in vibration frequency in the vicinity of its resonance point as to absorb the vibration of the control cable to reduce the vibration of the control cable. The vibration of the members connected to the control cable is also reduced thereby. For example, if a pore is formed through the center of a rubber damper D1 at the same time when the damper is formed in a tubular form, the damper can be fixed only with a screw bar 20 screwed into the pore. Besides the characteristic frequency of the damper can be varied by the shaving-off of its rubber body to vary its weight and/or its rigidity. The same can thus be easily tuned to the resonance frequency of a body being vibrated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a control cable-based vibration isolator.

More specifically, the present invention relates to a control cable installed for operating or driving a meter in a vehicle such as an automobile or a construction machine, and a device for preventing vibration of a member to which vibration is transmitted by the control cable.

[Prior Art] One of the causes of noise generated by automobiles is engine vibration. A control cable for operating the engine and transmission and driving instruments is connected to the engine and transmission, and the casing cap at the other end of the control cable is fixed to the dash panel or floor panel, and the inner cable end of the control cable is fixed to the dash panel or floor panel. Control pedals, control levers, and various instruments are connected to the .

Engine vibrations are transmitted to the dash panel and pedals via control cables, and when they vibrate, the membrane of the dash panel vibrates, producing muffled noise and causing the pedals to rattle and cause discomfort.

Similar circumstances drive a hydraulic motor by an engine,
This also applies to construction machinery that intermittently drives various hydraulic actuators.

In order to prevent vertical vibrations and the noise caused by them, vibration isolators have been proposed in Japanese Patent Application Laid-Open No. 81-81828 (Conventional Example) and Japanese Utility Model Application No. 58-86919 (Conventional Example ■). There is.

The device of Conventional Example I is intended for vibration isolation of a clutch control system, and as shown in FIGS. A dynamic damper (105) consisting of a weight and an elastic material is fixed thereto.

The device of Conventional Example H is also intended for vibration isolation of the clutch control system, and is installed on the dash panel (as shown in Fig. 22).
Do not directly connect the boss (122) fixed to the control cable conduit (10[i) to the boss (11B).
An elastic member (124) of a dynamic damper (132) is interposed between the boss (122) and the end face of the conduit (10B), and the boss (122) and the conduit (10B) are connected via the elastic member (124).
0B).

[Problems to be Solved by the Invention] Conventional Example I has a problem in that the damper has a complicated structure because the weight and the elastic material are layered.

Furthermore, in the device of Conventional Example H, since an elastic member is interposed between the dash panel and the control cable conduit, there is a problem that the elastic member expands and contracts each time the clutch is operated, increasing stroke loss.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a vibration isolating device which has a simple structure and has a small stroke cross of a control cable.

[Means to solve the problem] The vibration isolating device of the present invention will be explained based on FIG.

In the control cable system of the present invention, one end of a control cable provided for transmitting mechanical displacement is directly or indirectly connected to a vibration generation source, and the vibration is further transmitted by the control cable in the middle or at the other end of the control cable. This is a system in which there is a vibrated member that resonates due to the vibrations generated. The control cable is characterized in that one dynamic damper made of an elastic body is attached to one of the components of the control cable.

The dynamic damper according to the present invention is characterized in that it is made up of only an elastic body, and includes, for example, a thing made of only a rubber body, a thing made of only a spring, and a thing made of a combination of a rubber body and a spring.

A conventional dynamic damper physically combines a spring member and a weight member (such as the dynamic damper of Conventional Example I), but in the present invention, the weight of an elastic body is used as a mass element. There was a change in thinking, and the physical form of the dynamic damper was made only of an elastic body such as a rubber body.

[Function] In the control cable system shown in Figure 1, when vibration from a vibration source is applied to the control cable, the dynamic damper (D) cancels the vibration of the control cable at the vibration frequency near the resonance point. movement and reduce vibration of the control cable. Therefore, the vibration of the vibrated member connected to the control cable is also reduced.

The rubber damper of the present invention is easy to install. For example, if a rubber damper is formed into a cylindrical shape and at the same time a hole is bored in the center, it can be fixed simply by screwing a threaded rod into the hole or fitting it onto the outer periphery of the conduit. Furthermore, since there is no need for a weight member and there is no need to bond the weight member to the rubber body, manufacturing costs can be reduced.

Furthermore, the natural frequency can be changed by cutting away the rubber body and changing the weight and rigidity, so it is easy to tune it to match the resonant frequency of the vibrated body.

[Example] Next, the present invention will be explained in detail.

Fig. 1 is a block diagram of the present invention, Fig. 2 is a conceptual diagram of an automobile showing a control cable system to which the present invention can be applied, and Figs. 3 and 4 are explanatory diagrams illustrating the mounting position of the dynamic damper. , 5 to 10 are explanatory diagrams of the dynamic damper according to the present invention, FIGS. 11 to 13 are graphs showing the vibration spectra of the damper (old), (D3), and (D4), respectively, and FIG. 14 is the graph of the damper described above. 15 is an explanatory diagram showing the vibration test method. FIG. 16 is a graph showing the vibration spectrum of Comparative Example 1. FIG. 17 is a graph showing the vibration spectrum of Example 1. The figure is a graph showing the vibration spectrum of Example 2, FIG. 19 is a graph showing the vibration spectrum of Example 3,
20 and 21 are explanatory diagrams of the vibration isolating device of conventional example I;
The figure is an explanatory diagram of a vibration isolating device of conventional example (2).

(1) Cable system to which the present invention is applied The present invention is applied to a system in which vibration from a vibration source is transmitted through a control cable to vibrate a vibrated member to which the control cable is connected. Typical examples of such systems include operating systems and instrument drive systems for automobiles and construction machinery.

The embodiment will be explained based on FIG. 2. (1) is an automobile engine, (2) is a transmission, (3) is an accelerator pedal,
(4) is a clutch pedal, and (5) is a gear shift operating lever. In such a vehicle, the operating system can be applied to an accelerator cable 01), a manual transmission operating cable 02), an automatic transmission operating cable Ω, a clutch cable side, and a choke cable (G). The instrument drive system includes a speedometer drive cable Of3, a tachometer drive cable port, and the like.

All of these cables are directly or indirectly connected to the engine (1), which is the source of vibration, and the casing cap at the end of the conduit is fixed to the dash panel (6) or floor panel (9), and the end of the cable is connected to the engine (1), which is the source of vibration. equipment, levers, and instruments are connected.

The dash panel (6), floor panel (9), pedals, and instruments correspond to wave vibration members.

Furthermore, the same operating cables as in the case of automobiles are applicable to construction machinery, and the wave vibration members include the dash panel, the wall, floor, and operating lever of the driver's cab to which these cables are fixed.

(II) Attachment position of dynamic damper In the present invention, the dynamic damper is attached to any of the components of the control cable.

That is, the control cable conduit, the casing cap at the end of the conduit, the inner cable, and the cable end fitting of the inner cable are selected as attachment locations.

Next, the mounting position will be specifically explained based on FIGS. 3 and 4.

FIG. 3 shows a clutch cable (2) as an application example, and the following (2) to (3) indicate the mounting positions.

■Inner cable (1) on the clutch release lever (7) side
Cable end fitting (14b) of 4a) ■Inner cable (14a) on the release arm ('7) side■
Release arm (casing cap in potency (1
4c) ■Middle of the inner cable (14a)■ Conduit (14d) When attached to the conduit (14d), the wiring shape will be curved and the inner cable (14a) will come into strong contact with the inner wall of the conduit inside the conduit (14d). As a result, vibrations are transmitted from the inner cable (14a) to the conduit (14
It is preferable to proceed from the part where the information is transmitted to d) because the effect is greater.

Furthermore, when attached to the conduit (14d), the conduit (14
d) It is preferable to remove the synthetic resin covering layer covering the outer periphery and attach it so as to directly contact the conduit (14d).

■Casing cap (14c) on the pedal (4) side ■Inner cable (14a) on the pedal (4) side ■Cable end fitting (14θ) on the pedal (4) side Figure 4 shows the manual transmission operating cable (12) is an application example, and the following ■ to ■ indicate the mounting positions.

■The cable end fitting on the lever (8) side of the transmission ('2J) (
12b) ■Inner cable (12a) on the lever (8) side ■Lever (8)
) side casing cap (12c) ■Inner cable (1
In the middle of 2a) ■ Conduit (12d) In this case, the vibration is also transmitted from the inner element,
A site close to the floor panel (9) is preferred.

■Casing cap (12c) on the operation lever (5) side
■Inner cable (12a) on the operation lever (5) side ■Operation lever (
5) Side cable end fitting (L2e) As described above, in any of the examples shown in Figs.
．． Cables other than (14) can also be installed at similar locations. Further, the number of dynamic dampers installed is limited to one in each cable system.

(5) Structure of Dynamic Damper The dynamic damper of the present invention (hereinafter referred to as a damper) is composed only of an elastic body, and the weight of the elastic body is a mass element.

The elastic body used in the damper of the present invention includes synthetic rubbers such as chloroprene rubber, butyl rubber, and nitrile rubber;
Molded bodies made of rubber such as natural rubber and composite bodies made of various plastics such as polyurethane and polyvinyl chloride can also be used. In addition, springs can be used as elastic bodies, and their materials include ferrous metals such as steel and stainless steel, non-ferrous metals such as shells and aluminum, plastics such as polyacetal and polycarbonate, and composite materials such as FRP. Any material can be used as appropriate.

Next, each embodiment of the damper will be described based on the drawings.

Damper (Dl) As shown in Fig. 5, the damper (Dl) uses a cylindrical body (2D) made of rubber or plastic as an elastic body. A hole is drilled for insertion and fixation.

Damper (D2) As shown in FIG. 6, a cylindrical body (21b) is joined to the outer periphery of a cylindrical body (21a). Cylindrical body (21a
) and the cylindrical body (21b) are both elastic bodies made of rubber or plastic. Note that the cylindrical body (21a) and the cylindrical body (
By changing the weight and rigidity of 21b), two resonance points can be provided.

Damper (DB) As shown in Figure 7, this uses a thick disk (2V) made of rubber or plastic as the elastic body.A mounting hole is provided in the center of the thick disk (21). is drilled, and four large diameter holes (24a) and four small diameter holes (24b) are bored in the thick part.

Damper (D4) This damper (D4) uses a spring as an elastic body. As shown in FIG. 8, a steel mounting plate is screwed onto the member to be mounted (2), and a coiled spring is fixed to this mounting plate.

Damper (D5) As shown in FIG. 9, a thin leaf spring (to) is screwed onto the attached member (2).

Damper (DB) The damper (DB) shown in Fig. 1O uses a rubber cylindrical body (211) and a spring (5) as elastic bodies. The coil spring 4 is fixed through the coil spring 4, and the rubber cylindrical body (211) is attached to the tip of the coil spring (to), but the rubber cylindrical body (21) is inserted into the attached member (2), A coil spring may be fixed to the cylindrical body Qυ.This damper (DB) can have two resonance points by changing the resonance points of the cylindrical body C21) and the spring 4.

Although the above embodiments of the damper have been described, the present invention is not limited to these embodiments, and any damper made of only an elastic body is included in the damper of the present invention.

■Vibration test The vibration isolator of the present invention was subjected to a vibration test according to the following procedure.

(The damper used in the ω damper test was the damper (DI) shown in Figure 5.
, a damper (DB) shown in FIG. 7, and a damper (D4) shown in FIG.

The specifications of the damper (DI) are as follows: The outer diameter of the cylindrical body (211 is 50 mm)
mm.

The length is 50+am, the weight is 142.7g, and the material is chloroprene rubber (hardness Hs 60").No. 11
It has a vibration spectrum as shown in the figure, and there are 3 resonance points.
48.75+12, and the vibration acceleration during resonance is 7G when using a human-powered IC.

The damper (DB) has an outer diameter of 50 mm, a thickness of 10 mm, an inner diameter of the hole of 51 mm, an inner diameter of the hole (24a) of 6 mm, and a hole (24 b).
The inner diameter of
80＠) and weighs 25.22g. It has a vibration spectrum as shown in Figure 12, 120.0011
It has two resonance points, z and 216.2511z.

The vibration acceleration at resonance is 3.8 for each input IG.
G, 4.8G.

The damper (D4) has a free length of four springs of LOHM, a coil outer diameter of 35gm, a wire diameter of 5cm, a number of turns of 6, a material of hard steel wire 5W-C [JIS-03521], and a weight of 150.
05g.

The spring constant is 6 kg/am. It has a vibration spectrum as shown in Figure 13, and the resonance point is 170.0011.
z, the vibration acceleration during resonance is 100G or more when input IG.

The vibration spectra of each damper (DI), (DB), and (D4) were measured as follows. As shown in FIG. 14, a vibration test device (40) [vS-
3203], and the damper (
One each of DI), (DB), and (D4) was attached. An acceleration pickup (32) [PV-90A made by Rion Co., Ltd.] is attached to each damper (Dl), (DB), and (D4), and an amplifier (42) [UV-011, PPT made by Rion Co., Ltd.] is attached to the pickup (32). Analyzer (43
) [CP-920 manufactured by Ono Sokki Co., Ltd.] and a printer (44) (CX-337 manufactured by Ono Sokki Co., Ltd.) were connected. A constant sine wave vibration with an input acceleration tC was
A resonance waveform was drawn by inputting a signal from 0 Hz to 52011 z at a sweeping speed in ID minutes.

(b) Vibration test device As shown in FIG. 15, an acceleration pickup (31) was attached to the dash panel (6), and an acceleration pickup (32) was attached to the clutch release lever (7). An amplifier (
42), FPT analyzer (43), printer (44)
connected. The mounting position of each (Di), (D3), and (D4) damper is the release lever (of the clutch cable 04).
This is the cable end fitting (14b) on the blade side.

The test vehicle used was a Suzuki Jimny 1300.61 model, model E-JA51W. The panel side pickup (31) of the nJ meter used was PV- manufactured by Rion Co., Ltd.
85B, pickup (32), amplifier (42)
, FFT analyzer (43), and printer (44) are the first
It is the same as that in Figure 4.

(C) Measurement method Adjust the engine (1) of the test vehicle to the specified rotation speed,
The clutch pedal (4) was repeatedly depressed and released, and the vibration when a muffled sound was generated from the dash panel (6) was detected and frequency analyzed.

Experimental examples are shown in the table below.

(Small results The results are shown in Figures 16-19.

In each figure, (A) is the release lever (7')
(B) is the vibration spectrum of the dash panel (6).

FIG. 16 shows the results of Comparative Example 1 in which no damper was attached. According to this, the engine speed is 3500 rpm.
It can be seen that in m, many vibration peaks of 0.5 G or more appear in the release lever (7') in the frequency range of 100 to 400 Hz, and many vibration peaks reach IG. It can also be seen that many vibration peaks of 0.1G or more appear on the dash panel (6), and some vibration peaks reach 0.25G.

On the other hand, in Example 1.2.3 of the present invention in which dampers (Di), (D3), and (D4) were attached, the following results were shown. Note that Example 1.2.3 and Comparative Example 1 have the same experimental conditions and correspond to each other.

In Example 1 (damper DI) shown in FIG. 17, the vibration acceleration of the release lever (7) is reduced to almost 0.5G or less, and the vibration acceleration of the dash panel (6) is also reduced to almost 0.1G or less. I can see that you are doing it. Note 1
A high vibration peak appears near 2011z, but since the frequency is low, muffled sound does not occur and there is no actual damage.

In the second embodiment (damper D3) shown in FIG. 18, the vibration acceleration of the release lever (7) is reduced to 0.2 G or less at frequencies around 12 inch IZ and around 220 Hz,
It can be seen that the vibration acceleration of the dash panel (6) has also been reduced to 0.05G or less. Note that a high vibration peak appears near 9011z, but this too has a low frequency, so no muffled sound is generated and no actual damage is caused.

As mentioned above, this damper (D3) has two resonance points, so it exhibits a vibration reduction effect in a wide frequency range including the two resonance points.
2) and the damper (D6) in FIG. 10 also have two resonance points, so they can similarly exhibit a vibration reduction effect in a wide frequency range.

In the third embodiment (damper D4) shown in FIG. 19, the release lever is
The vibration acceleration in (7) is 0. It can be seen that the vibration acceleration of the dash panel [6] has been reduced to approximately 0.050 or less. Although a high vibration peak appears near 120 Ilz, this is also a low frequency so no muffled sound is generated and no actual damage is caused.

As described above, it can be seen that according to the present invention, there is a remarkable vibration damping effect compared to the case where no damper is attached.

[Effects of the Invention] According to the present invention, vibrations in the control cable system can be effectively damped. Furthermore, it is easy to assemble and can be manufactured at low cost. Furthermore, the operability of the control cable is not obstructed.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a conceptual diagram of an automobile showing a control cable system to which the present invention can be applied, and Figs. 3 and 4 are explanatory diagrams illustrating the mounting position of the dynamic damper. , 5 to 10 are explanatory diagrams of the dynamic damper according to the present invention, FIGS. 11 to 13 are graphs showing the vibration spectra of the dampers (Di), (D3), and (D4), respectively, and FIG. 15 is an explanatory diagram showing the vibration test method. FIG. 16 is a graph showing the vibration spectrum of Comparative Example 1. FIG. 17 is a graph showing the vibration spectrum of Example 1. Figure 19 is a graph showing the vibration spectrum of Example 2, Figure 19 is a graph showing the vibration spectrum of Example 3, Figures 20 and 21 are explanatory diagrams of the vibration isolator of Conventional Example I,
FIG. 2 is an explanatory diagram of the vibration isolating device of conventional example (2). (Main symbols in the drawing) OL): Accelerator cable 02): Manual transmission operation cable (I3: Automatic transmission operation cable A4): Clutch cable (G): Speedometer drive cable A7) Two-tachometer drive cable AS : Choke drive cable: Rubber cylindrical body 4-coil spring Patent applicant Nippon Cable System Co., Ltd. Patent attorney Sota Asahina Haka 1 year old 1 year Hosai 2 figure 3rd 4th mouth 5th 1b off figure o 9th No. 110 Vibration frequency (Hz) Vibration frequency (Hz) Figure 14 Figure 15 A'16 Vibration frequency (Hz) Figure 17 Vibration frequency (Hz) Figure 18 Vibration Frequency (Hz) Vibration Frequency (Hz) Vibration Acceleration (G) Vibration Frequency (Hz) Vibration Frequency (Hz) Procedural Correction Written Type) % Formula % Relationship of 1 case to the indicated case Patent application Address 1-12-28 Sakaemachi, Takarazuka City, Hyogo Prefecture Name Nippon Cable System Co., Ltd. Representative Teraura
Fact 5: Date of amendment order July 26, 1986 (dispatch mill) 6: Subject of amendment (1) “Brief explanation of drawings” column of specification (2)
Contents of amendment to Drawing Plane 7 (1) Change “5th to IOJ” to “5th to 1st
0 figure”. (2) The drawings (FIGS. 12 and 13) are corrected as shown in the corrected drawings (FIGS. 12 and 13). 8 List of attached documents (1) Amended drawings (Figures 12 and 13) 1 copy No. 12 Tosai 13 [2 Vibration frequency (Hz) Procedural amendment stamp button

Claims (1)

[Scope of Claims] 1 (a) A control cable provided for transmitting mechanical displacement, one end of which is directly or indirectly connected to a vibration generation source, and a part of the control cable or other part of the control cable. In a system in which there is a vibrated member at the end that resonates due to vibrations transmitted by the control cable, (b) a control in which one dynamic damper made only of an elastic body is attached to one of the components of the control cable; Cable-based vibration isolator. 2. The device according to claim 1, wherein the dynamic damper is made of a rubber body. 3. Claim 1, wherein the dynamic damper comprises a spring.
The device described. 4. The device according to claim 1, wherein the dynamic damper comprises a rubber body and a spring. 5. The device according to claim 2, 3 or 4, wherein the mounting position of the dynamic damper is an end of an inner cable of a control cable. 6. The device according to claim 2, 3 or 4, wherein the dynamic damper is installed in the middle of the inner cable of the control cable. 7. The device according to claim 2, 3 or 4, wherein the mounting location of the dynamic damper is a control cable conduit. 8. The device according to claim 2, 3 or 4, wherein the mounting position of the dynamic damper is a casing cap of a control cable. 9. The device according to claim 2, 3 or 4, wherein the control cable is a cable for operating a clutch of a vehicle. 10. The device according to claim 2, 3 or 4, wherein the control cable is a cable for operating a manual transmission of a vehicle. 11. The device according to claim 2, 3 or 4, wherein the control cable is a cable for operating an automatic transmission of a vehicle. 12. The device according to claim 2, 3 or 4, wherein the control cable is a cable for operating an accelerator of a vehicle. 13. The device according to claim 2, 3 or 4, wherein the control cable is a choke operating cable for a vehicle. 14. The device according to claim 2, 3 or 4, wherein the control cable is a cable for driving a speedometer of a vehicle. 15. The device according to claim 2, 3 or 4, wherein the control cable is a cable for driving a tachometer of a vehicle. 16. The device according to claim 2, 3 or 4, wherein the control cable is a cable for operating a construction machine.