JPS6116850B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention has an outer cable made of a flexible cylindrical body and an inner wire made of a steel cable, and a part of the outer cable has a metal wire curved in an arc shape. This invention relates to improvements in control cables that are used mainly for small vehicles such as motorcycles, and which are equipped with a guide tube made of aluminum.

[Conventional technology]

For example, as shown in Fig. 1, when the control cable is used as a throttle wire A or a clutch wire B of a motorcycle, a part of the outer cable is provided with a guide tube C curved in an arc to change the operating direction of the inner wire. Sometimes.

As shown in Fig. 2, the guide tube C is generally made by curving a metal tube into an arc shape, and a liner D made of soft synthetic resin is provided on the inner peripheral surface of the curved part to increase wear resistance, or a liner D made of soft synthetic resin is provided on the inner peripheral surface of the curved portion, or an inner wire is provided. Efforts are being made to reduce frictional resistance during operation.

On the other hand, since the inner diameter of the liner is set to be larger than the outer diameter of the inner wire, there is a relatively large gap between the liner and the inner wire. Over time, the curvature of the outer cable may change, and the play of the inner wire within the outer cable may increase, reducing operational responsiveness.

[Objective of the invention/means for solving the problem]

The purpose of this invention is to eliminate such problems and obtain a control wire that is easy to manufacture and has excellent response. A cylindrical liner made of hard synthetic resin with an outer diameter approximately equal to the inner diameter of the metal tube is fitted into the inside of the guide tube, and the central part of the guide tube is curved into an arc shape together with the liner, and the liner is crushed so that the cross section at the bent part is The feature is that the shape is deformed into an ellipse to prevent movement in the axial direction, and an inner wire is inserted through the liner.

[Effect]

When a liner is inserted into a metal tube and bent to form an L-shaped guide tube, the metal tube is crushed and has an elliptical cross-sectional shape, and its long diameter portion applies strong pressure to the outer periphery of the liner. Since movement of the parts is prevented, assembly is easy. In addition, the inner wire inserted into the liner is guided by the shorter diameter part of the liner, which has an oval shape, and movement in the radial direction is prevented, resulting in a stable position within the L-shaped metal tube and free play in the length direction. It becomes less.

〔Example〕

Hereinafter, this will be explained with reference to the illustrated embodiment. Reference numeral 1 indicates a steering handle of a motorcycle, and operating levers such as a clutch lever 3 and a brake lever 4 are rotatable near grips 2 formed at both ends. It is freely pivoted. 5 is a clutch wire connected to the clutch lever 3, 6 is a brake wire connected to the brake lever 4, and 7 is a throttle wire, which connects the grip 2 on the right side that can be rotated and a carburetor (not shown). As is conventionally known, each of these wires constitutes a control wire composed of an outer cable 8a and an inner wire 8b inserted into the outer cable 8a.

Reference numeral 9 denotes an L-shaped guide tube inserted in the bent portion of the control wire. The guide tube 9 is made of an alloy having approximately the same diameter as the outer cable 8a, and has a curved portion 9 curved with a relatively large curvature as shown in FIG.
a and introduction portions 9b provided at both ends thereof and extending in the tangential direction. Reference numeral 10 denotes a liner made of hard synthetic resin, such as polyacetal resin, fixed to the inner peripheral surface of the curved portion 9a.

The guide tube 9 and liner 10 are coupled as follows. First, as the material for the guide tube 10, the outer diameter 5
mm, a straight steel pipe 9c with an inner diameter of 3 mm, and this steel pipe 9
A liner 10 having a diameter 0.05 to 0.1 mm smaller than the inner diameter of pipe 9c and cut slightly shorter than the steel pipe 9c is prepared.
Next, when the steel pipe 9c with the liner 10 inserted into the steel pipe is bent by plastic working, the perfectly circular steel pipe 9c and liner 10 shown in FIG. 4 become as shown in FIG.
The inner wire 8b is deformed into an elliptical shape with its major axis in a direction parallel to the axis to be curved, and is prevented from being pulled out, and at the same time, the position of the inner wire 8b passed therethrough is regulated by the minor axis of the liner 10, which has become an ellipse. , its position becomes stable, resulting in less play. That is, the clearance between the liner 10 and the inner wire 8b is relatively large as shown by C in FIG. 4 before bending, but becomes relatively small after bending as shown by C in FIG. There is. Therefore, as shown in Figure 3a before bending, when the control wire is pulled, the inner wire 8b is in the position shown by the solid line, and the inner wire 8b that was in contact with the guide tube in the bending direction is released. When the liner 10 comes into contact with the outer surface, as shown by the two-dot chain line, there is a large amount of play due to the large change in curvature, but after bending, the liner 10 deforms into an elliptical shape. Since the curvature of the inner wire 8b does not change, the amount of play changes little.

〔Effect of the invention〕

As described above, this invention has a method in which a cylindrical liner made of hard synthetic resin and having an outer diameter approximately equal to the inner diameter of the metal tube is fitted inside an L-shaped guide tube inserted in the middle of the outer cable. The center part of the liner is bent into an arc shape together with the liner to crush the liner, and the cross-sectional shape at the bent part is deformed into an elliptical shape. The position does not change between when it is activated and when it is in the open state, reducing play.

Furthermore, the liner is also prevented from moving in the axial direction, making assembly easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is an external view of the operating handle of a motorcycle, and Figure 2 is a cross-sectional view along the axis of the guide tube, which is the main part.
FIG. 3 is a longitudinal cross-sectional view of the main part, FIGS. 4 and 5 are cross-sectional views thereof, and FIG. 6 is a cross-sectional view of the steel pipe 9c. 9... L-shaped guide tube, 9a... Curved portion, 9c...
...steel pipe, 10... liner.

Claims (1)

[Scope of Claims] 1. A cylindrical liner made of hard synthetic resin and having an outer diameter approximately equal to the inner diameter of the guide tube is fitted inside an L-shaped guide tube inserted in the middle of the outer cable, The central part of the metal tube is bent into an arc along with the liner, the liner is crushed and the cross-sectional shape at the bent part is deformed into an ellipse to prevent movement in the axial direction, and an inner wire is inserted through the liner. control cable. 2. The control cable according to claim 1, wherein the inner wire is made of steel cable.