JPS6326414A - Driving cable for vehicle instrument - Google Patents

Abstract

PURPOSE:To prevent waving of a flexible shaft being inserted through a flexible pipe and the occurrence of interference sound, by cutting the flexible pipe constituting a cable outer midway into two pieces and providing, there between both a swash plate loosely fitted to the flexible shaft and a rotary swash plate fixed to the flexible shaft. CONSTITUTION:A flexible pipe 1 constituting the outer of a driving cable for vehicle instruments, together with a casing 5, is cut midway into pipe pieces 1A, 1B, with both 1A and 1B connected and fixed to each other by way of the casing 5. Further, between both pipe pieces 1A and 1B, a rotary swash plate 3 comprising resin or metal, etc. is fixed to the flexible shaft and, against the rotary swash plate, a swash plate 4 is fixed to the end face 1a of one pipe piece 1A of the flexible pipe 1 or to the casing 5 in the vicinity of the rotary swash plate 3 so as to be loosely fitted to a flexible shaft 2. Therefore, the forced centering of the flexible shaft 2 by means of the swash plate 4 makes the flexible shaft 2 difficult to undergo waving and prevents the interference sound from occurring between the flexible shaft 2 and the flexible pipe 1.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vehicle instrument drive cable.

[Conventional technology]

In the conventional vehicle instrument drive cable, as shown in the schematic diagram of its appearance in Fig. 8, the outer part is constituted by the flexible shaft 2 and the flexible tube 1 that holds it, and the outer part is made up of the flexible shaft 2 and the flexible tube 1 that holds it, and the outer part is made up of a flexible shaft 2 and a flexible tube 1 that holds the shaft. Possible metal fittings are fixed to the visible tube 1.

As shown in the partial cross-sectional view of the outer part in Fig. 9,
It simply consists of a flexible shaft 2 and a flexible tube 1, and there is play between the flexible shaft 2 and the flexible tube 1, and the flexible shaft 2 also bends in the torsional direction. Because it has elasticity in the direction,
When a disturbance is applied, the flexible shaft 2 causes a waving phenomenon, as shown in a sectional view of the operating state in FIG. 10, and a striking sound between the flexible shaft 2 and the flexible tube 1 is generated. In addition, transmission gear noise and drive cable drive side noise are transmitted through the air between the flexible shaft 2 and the flexible tube 1 from the drive side, and the sound and vibration are radiated and resonated in the vehicle instrument. There is a lot of noise.

[Problem that the invention seeks to solve]

As mentioned above, in conventional vehicle instrument drive cables, there are problems in that the flexible shaft becomes wavy due to external disturbances, resulting in impact noise between the flexible shaft and the flexible tube. There has been a problem in that the grinding noise and noise on the drive side are transmitted through the space between the flexible shaft and the flexible tube, and the noise of the drive cable increases in vehicle instruments.

[Means for solving problems]

In the present invention, a flexible tube is divided in the middle, at least one of a shielding plate that plays with the flexible shaft and a rotary shielding plate fixed to the visible shaft is disposed between the flexible tubes, and the divided flexible tube is separated by a casing. It is a fixed combination of comrades.

(Operation) Since the flexible shaft is forcibly centered by the shielding plate, the elastic flexible shaft is restrained in its behavior in the bending direction, that is, the waving direction, and becomes like a rigid shaft, unlike the conventional flexible shaft. The waving phenomenon is extremely unlikely to occur, and no interference noise is generated between the flexible shaft 2 and the flexible tube.

In addition, since the gap between the shield plate and the visible axis is extremely small,
Since the air gap between the shield plate and the rotating shield plate is also extremely small, a constriction effect occurs, and the sound and vibrations transmitted through the air gap between the flexible shaft and the flexible tube are extremely attenuated by the constriction effect. .

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described. 1st
The figure is a longitudinal cross-sectional view of a main part showing the configuration of one embodiment of the vehicle instrument drive cable according to the present invention, and FIG. 2 is a schematic diagram of the overall appearance of the vehicle instrument drive cable according to the present invention shown in FIG. The flexible tube 1 is cut in the middle of the outer part to form tube pieces IA and IB, and a rotating shield plate 3 made of resin or metal is fixed to the flexible shaft 2 between the tube pieces IA and IB. A shield 4 made of a resin or metal elastic material is attached to the flexible shaft 2 on the end surface 1a of one tube piece IA of the flexible tube 1 or on the casing 5 near the rotary shield 3, facing the rotary shield 3. It is fixed in such a way that it fits together. Here, the inner diameter of the shielding plate 4 is approximately the same as the outer diameter of the flexible shaft 2 (+0.5), and the outer diameter of the rotating shielding plate 3 is larger than the inner diameter of the swash plate 4. Note that the cut tube pieces IA and IB of the flexible tube 1 are connected and fixed to each other by the casing 5.

Next, to explain the operation of the drive cable of the present invention having the above structure, even if transmission gear noise and drive cable drive side noise occur on the drive side, the air gap between the flexible shaft 2 and the flexible tube 1 Because the air gap between the shield 4 and the flexible shaft 2 is extremely small, and the gap between the shield plate 4 and the rotating shield plate 3 is also extremely small, the sound and vibrations transmitted through the air are extremely attenuated due to the throttling effect. As a result, sound and vibration are no longer transmitted to the vehicle's instruments. In addition, since the flexible shaft 2 is forcibly centered by the shielding plate 4, the flexible shaft 2, which has elasticity, is restricted in its behavior in the bending direction, that is, the waving direction, so it becomes like a rigid shaft, and unlike the conventional Although such a waving phenomenon of the flexible shaft 2 occurs, no interference sound is generated between the flexible shaft 2 and the flexible tube 1. Therefore, noise and vibration transmitted through the drive cable are extremely reduced, and noise generated from the drive cable can be prevented.

Next, FIGS. 3 to 7 are longitudinal cross-sectional views of main parts showing the structure of other embodiments of the vehicle instrument drive cable according to the present invention, and the embodiment shown in FIG. 3 is the same as that shown in FIG. 1. Compared to the embodiment shown in FIG. 1, only the rotary shield plate 3 is used without the shield plate, and the configuration other than that the shield plate 3 is placed close to the end surface 1a of the tube piece IA is the same as that of the embodiment shown in FIG. is the same as The embodiment shown in FIG. 4 differs from the embodiment shown in FIG. In the embodiment shown in FIG. 4, a shielding plate 4 is also provided on the end face lb side of the other tube piece 1B, so that two shielding plates 4 are used.

Further, the embodiment shown in FIG. 7 uses one shielding plate 4, and its cross-sectional shape has a triangular protrusion-shaped portion 4a on the inner diameter part, so that the play with the flexible shaft 2 is made as small as possible. ,
The embodiments shown in FIGS. 3 to 7 can achieve the same effects as the embodiment shown in FIG. 1, although there are some differences in effects.

〔Effect of the invention〕

As described above, in the vehicle instrument drive cable according to the present invention, the flexible shaft 2 is forcibly centered by the shielding plate 4, so that the flexible shaft 2 having elasticity behaves in the bending direction, that is, in the waving direction. Since the flexible shaft 2 is restrained, the waving phenomenon of the flexible shaft 2 as in the conventional case is extremely difficult to occur, and there is an effect that interference noise between the flexible shaft 2 and the flexible tube 1 is no longer generated. In addition, the gap between the shielding plate 4 and the flexible shaft is extremely small, and the shielding plate 4
Since the air gap between the flexible shaft 2 and the rotating shield plate 3 is extremely small, a throttling effect occurs, and even if transmission gear noise and drive cable drive side noise occur on the drive side, the air gap between the flexible shaft 2 and the flexible tube 1 will be reduced. This has the effect that the sound and vibration transmitted through the air are severely attenuated, and the sound and vibration are no longer transmitted to the vehicle instrumentation side.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part showing the configuration of an embodiment of a vehicle instrument drive cable according to the present invention, and FIG. 2 is a schematic diagram of the overall appearance of the vehicle instrument drive cable according to the present invention shown in FIG. Third
7 to 7 are longitudinal cross-sectional views of main parts showing the configuration of other embodiments of the vehicle instrument drive cable according to the present invention, and FIG. 8 is a schematic diagram showing the overall appearance of a conventional vehicle instrument drive cable, 9 is a vertical sectional view of a main part of the conventional drive cable shown in FIG. 8, and FIG. 10 is a sectional view showing the operating state of the conventional drive cable shown in FIG. 9. ■...Flexible tube, LA, IB...tube piece, 2...flexible shaft. 3... Rotating shield plate, 4... Shield plate, 5... Casing, la... End face portion of flexible tube 1, 4a... Triangular protrusion shaped portion.

Claims (1)

[Claims] The flexible tube is divided in the middle, at least one of a shielding plate that plays with the flexible shaft and a rotating shielding plate fixed to the flexible shaft is disposed between them, and the divided flexible tubes are separated by a casing. A vehicle instrument drive cable characterized by being connected and fixed.