JPS6332977Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolation structure for a flexible shaft used to transmit the rotation of a drive source such as an automobile transmission to an instrument such as a speedometer.

A conventional flexible shaft of this type is shown in FIG. That is, this flexible shaft 1 is connected between a transmission 2 and a speedometer 3, and the main structure of the flexible shaft 1 is a tubular outer casing 4 made of resin or metal. , an inner shaft 5 coaxially inserted into the outer casing 4, a connector 6 for connecting to the speedometer 3 and a connecting nut 7 for connecting to the transmission 2, which are attached to both ends of the outer casing 14. By connecting the connector 6 and nut 7 to the speedometer 3 and transmission 2, the drive shaft of the transmission 2 and the operating shaft of the speedometer are connected via the flexible shaft 1, and the transmission 2 The rotational force is transmitted to the speedometer 2.

However, in such a conventional flexible shaft 1, since the outer casing 4 is made of a rigid material such as metal or resin, the vibration of the transmission 2 is caused by the outer casing 4. There is a problem in that the vibrations are transmitted to the speedometer and into the vehicle interior via the vibration shaft 1. Particularly when the flexible shaft 1 used is short, the vibrations are transmitted to the speedometer and the interior of the vehicle.

The present invention was developed by focusing on these conventional problems, and by interposing a vibration isolating material between the outer casing 4 and the flexible shaft, the vibration of the transmission is not transmitted to the meter and the passenger compartment. It is an object of the present invention to provide a vibration isolation structure for a flexible shaft that can be used as a flexible shaft.

The present invention will be explained in detail below based on the embodiment shown in FIGS. 2 and 3.

4 is an outer casing, and 5 is an inner shaft inserted into the outer casing 4. The outer casing 4 is separated into two in the longitudinal direction, and the separated end 41 of the outer casing 4, 41 between the separated ends 41, 41
Outer casing insertion parts 81, 81, each of which can be inserted from both directions, and a projection part 82, which arranges each of the separation ends 41, 41 facing each other at a predetermined interval.
A cylindrical rubber bush (vibration isolating member) 8 is interposed. In order to increase the bonding force between this rubber bush 8 and the outer casing 4 which has been separated into two, both separated ends 4 of the outer casing 4 are
An annular stopper 9 is fixedly formed on the outer periphery of the outer casings 1 and 41 by ultrasonic welding means, while an annular inner periphery with which the annular stopper 9 engages is formed on the inner periphery of both outer casing fitting portions 81 and 81 of the rubber bushing 8. Groove 8
3,83 are provided. Reference numerals 10 and 10 denote half-shaped presser members attached to the outer circumferential surface of the rubber bush 8, and in the drawing, the presser members 10, 10 on the rubber bush 8 are attached to the upper and lower pairs.
The outer casing 4 and the rubber bushing 8, which have been separated into two parts, are fastened and fixed together by the fastening rings 11 disposed at both outer casing insertion portions 81, 81 of the rubber bushing 8. It is something that exists. Further, the presser members 10, 10 have stepped portions 84, 84 formed on the outer peripheral surfaces of both outer casing fitting portions 81, 81 of the rubber bushing 8.
Step portions 101, 101 that engage with are provided. Note that reference numeral 12 denotes protrusions formed near both ends of the presser member 10 to prevent the fastening ring from coming off.

As described above, in this embodiment, the flexible shaft is cut at an appropriate position in the longitudinal direction of the outer casing 4, and the two divided outer casings are connected to each other via the rubber bushing 8. Due to the vibration absorption effect of 8,
The vibration received at one end of the outer casing 4 is
Therefore, when this flexible shaft is used to connect a transmission and a speedometer, vibrations of the transmission are not transmitted to the other end of the outer casing 4. This has the effect of providing a flexible shaft with excellent vibration isolation without being transmitted to the inside.

As described above, the present invention provides an inner shaft 5 whose one end is connected to the drive source output shaft and the other end is connected to the instrument input shaft.
and a flexible shaft consisting of a tubular outer casing 4 that rotatably accommodates the inner shaft 5,
The outer casing 4 is separated in its longitudinal direction, and the separated end 4 of the outer casing 4 is separated.
Between 1 and 41, there is an outer casing insertion part 8 into which the separated ends 41 and 41 can be inserted from both directions.
1, 81 and a protrusion 82 which makes the separated ends 41, 41 face each other at a predetermined interval. An annular stopper 9 is fixedly formed on the outer periphery of the vibration isolating member 8, and annular inner circumferential grooves 83, 83 are provided on the inner circumferential surface of both outer casing fitting portions 81, 81 of the vibration isolating member 8, in which the annular stopper 9 engages. Further, a pair of halves are attached to the outer periphery of the vibration isolating member 8 and connect the two separated ends 41, 41 of the outer casing 4 with the outer casing fitting portions 81, 81 of the vibration isolating member 8 interposed therebetween. Split-shaped presser members 10, 10 are provided, and the presser members 10, 10 are provided with steps that engage with step portions 84, 84 formed on the outer peripheral surfaces of both outer casing fitting portions 81, 81 of the vibration isolating member 8. Part 101,
According to the present invention, an annular stopper 9 fixedly formed on the outer periphery of both separated ends 41, 41 of the outer casing 4 and a vibration isolating member 8 are provided. Since the outer casing fitting parts 81, 81 are configured to mesh and fit with the annular inner circumferential grooves 83, 83 formed on the inner circumferential surface of the two outer casing fitting parts 81, 81, the fitting force causes the outer casing 4 to move in the tensile direction and the compressive direction. Not only can the vibration force be reliably absorbed, but also the vibration isolating member 8 can be prevented from detaching due to the vibration of the outer casing 4. Further, according to the present invention, since the presser members 10, 10 attached to the outer periphery of the vibration isolating member 8 are formed into a pair of half halves,
Assembling work is easy, and one type of holding member 10 can be used for vibration isolating members 8 having various diameters. Further, according to the present invention, the presser member 1
0 and 10, the outer casing 4 separated into two parts is continuously held via the vibration isolating member 8, so that the deflection shaft is bent with an abnormally small curvature when the cable is being routed or during the cable routing work. Since there is no permanent deformation of the inner shaft, it is possible to prevent the occurrence of abnormal noise during rotation of the inner shaft and the occurrence of needle deflection of the instrument. In addition, the bending moment of the outer casing 4 is transferred to the vibration isolating member 8 by the holding members 10, 10.
Since the effect on vibration is alleviated, the hardness of the vibration isolating member 8 can be set low, and the vibrations transmitted by the outer casing 4 can be better absorbed. Further, according to the present invention, the stepped portions 101, 10 formed on the presser members 10, 10
Both outer casing insertion parts 8 of 1 and vibration isolating member 8
Since the stepped portions 84, 84 formed on the outer circumferential surface of 1, 81 are configured to engage with each other, the vibration force in the tensile direction of the outer casing 4 can be reliably absorbed by the engagement force, and the vibration of the outer casing 4 can also It is possible to prevent the members 10, 10 from coming off, and by extension, the vibration isolating member 8 from coming off. Further, as described above, the vibration isolating member 8 or the pressing member 10,
Since the structure of No. 10 has excellent vibration resistance, it has the effect of providing a vibration-proofing structure for a flexible shaft that is particularly advantageous for use in an automobile flexible shaft connected to a drive shaft of a transmission that generates vibration. There is.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the conventional deflection axis, Figure 2
The figure is a sectional view showing the deflection shaft vibration isolation structure according to the present invention, and FIG. 3 is a side view of the same. 4...Outer casing, 5...Inner shaft, 8
. . . Rubber button, 9 . . . Stopper, 10 . . . Holding member, 11 .

Claims (1)

[Claims for Utility Model Registration] A flexible shaft consisting of an inner shaft 5 whose one end is connected to the drive source output shaft and the other end is connected to the instrument input shaft, and a tubular outer casing 4 which rotatably houses the inner shaft 5. An outer casing insertion part 8 is provided which separates the outer casing 4 in its longitudinal direction and into which the separated ends 41 and 41 of the outer casing 4 can be inserted from both directions.
1, 81 and a protrusion 82 which makes the separated ends 41, 41 face each other at a predetermined interval. An annular stopper 9 is fixedly formed on the outer periphery of the vibration isolating member 8, and annular inner circumferential grooves 83, 83 are provided on the inner circumferential surface of both outer casing fitting portions 81, 81 of the vibration isolating member 8, in which the annular stopper 9 engages. Further, a pair of halves are attached to the outer periphery of the vibration isolating member 8 and connect the two separated ends 41, 41 of the outer casing 4 with the outer casing fitting portions 81, 81 of the vibration isolating member 8 interposed therebetween. Split-shaped presser members 10, 10 are provided, and the presser members 10, 10 are provided with steps that engage with step portions 84, 84 formed on the outer peripheral surfaces of both outer casing fitting portions 81, 81 of the vibration isolating member 8. Part 101,
An anti-vibration structure for a deflection shaft, characterized by the provision of 101.