JPH08114292A - Low pressure power steering hose clamping part and clamping method thereof - Google Patents

Abstract

PURPOSE: To enable a low pressure power steering hose clamping part to prevent any operating oil in a pipeline from being leaked out of a clearance by fitting an oil absorptive expansible rubber ring in a gap with this low pressure power steering hose fitted in the end circumference of a metal pipe. CONSTITUTION: An oil absorptive expansible rubber ring 2 is fitted in the end circumference of a metal pipe 1 provided with two hose slip-preventive projections 5 and 6 at the end, and subsequently the end of a low pressure power steering hose 3 is fitted in an outer boundary of the fitted oil absorptive expansible rubber ring 2, and further a plate clamper 4 or wire clip is clamped to the circumference of the low pressure power steering hose 3. Accordingly, supporting abnormal high or low temperature and high or low humidity or the like are repeated for a long period of time and thereby stress relief in this power steering hose is produced there, whereby a clearance is produced between the outer circumference of the metal pipe and the inner circumference of the power steering hose and operating oil in the pipeline is leaking from the clearance, the oil absorptive expansible rubber ring is swollen, capable of dispensing with this clearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low pressure power steering hose fastening portion and a fastening method thereof.

[0002]

2. Description of the Related Art In recent years, the number of vehicles equipped with a power steering, which can be easily operated by a steering wheel, has been greatly increased.

The power steering piping includes high-pressure piping for sending high-pressure hydraulic oil from the pump to the steering section and low-pressure piping for returning the hydraulic oil of low pressure from the steering section to the pump.

The hose fastening portion of the high-pressure pipe has an end portion of the low-pressure power steering hose between the socket portion and the nipple portion of the metal pipe, which is provided with a compression swaging portion including a socket portion and a nipple portion. After inserting the portion, the outer periphery of the socket portion is compressed and swaged to be firmly fastened.

On the other hand, the hose fastening portion of the low pressure pipe is
Since the pressure is low, the low pressure power steering hose and the metal pipe are relatively lightly fastened.

FIG. 2 is a front view showing a method of fastening a conventional low pressure power steering hose fastening portion.

In FIG. 2, 1 is a metal pipe, 3 is a low-voltage power steering hose, 4 is a plate clamp, and 5, 6
Is a projection for preventing hose disconnection.

That is, in the conventional low pressure power steering hose fastening portion, the end portion of the low pressure power steering hose 3 is covered with the outer circumference of the end portion of the metal pipe 1 having the hose disconnection preventing projections 5 and 6 provided at the end portions. After that, the plate clamp 4 or a wire clasp (not shown) was clamped on the outer periphery of the low-pressure power steering hose 3 which was fitted.

However, in such a conventional low-pressure power steering hose fastening portion, when abnormally high temperature, low temperature, high humidity, low humidity, etc. are repeated for a long period of time, stress relaxation of the low pressure power steering hose 3 occurs, thereby causing a metal pipe. There is a concern that a gap may be formed between the outer peripheral surface of No. 1 and the inner peripheral surface of the low-voltage power steering hose 3, and the hydraulic oil in the pipe may leak from the gap.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art, to obtain abnormally high temperature, low temperature, high humidity, Even if low humidity is repeated for a long period of time, stress relaxation of the low pressure power steering hose does not occur, so that there is no gap between the outer peripheral surface of the metal pipe and the inner peripheral surface of the low pressure power steering hose. It is an object of the present invention to provide a low-pressure power steering hose fastening portion and a fastening method thereof, which completely eliminates the risk of hydraulic oil leaking from the gap.

[0011]

SUMMARY OF THE INVENTION The gist of the present invention is to provide an oil-absorbing expandable rubber between an outer circumference of an end portion of a metal pipe and a low pressure power steering hose fitted to the outer circumference of the end portion of the metal pipe. A low-voltage power steering hose fastening portion and a fastening method thereof, characterized by being fitted with a ring.

[0012]

The low pressure power steering hose fastening portion and method of fastening the same according to the present invention provide an oil absorbing expansive rubber between an outer periphery of an end portion of a metal pipe and a low pressure power steering hose fitted to the outer periphery of the end portion of the metal pipe. Since the ring is fitted, abnormally high temperature, low temperature, high humidity, low humidity, etc. are repeated over a long period of time, resulting in stress relaxation of the low-voltage power steering hose, which causes the outer peripheral surface of the metal pipe and the low-pressure power to decrease. Even if a gap is created between the inner surface of the steering hose and the hydraulic oil in the pipe leaks out from the gap,
The leaked hydraulic oil swells the oil absorbing expansive rubber ring and eliminates the gap between the outer peripheral surface of the metal pipe and the inner peripheral surface of the low pressure power steering hose, resulting in further leakage of hydraulic oil. It can be completely lost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a low pressure power steering hose fastening portion and its fastening method according to the present invention will now be described with reference to the drawings.

FIG. 1 is a front explanatory view showing an embodiment of a low pressure power steering hose fastening portion and a fastening method therefor according to the present invention.

In FIG. 1, 1 is a metal pipe, 2 is an oil absorbing expansive rubber ring that characterizes the present invention, 3 is a low pressure power steering hose, 4 is a plate clamp, and 5 and 6 are hose slip-out preventing projections.

That is, in one embodiment of the low pressure power steering hose fastening portion and its fastening method of the present invention, the metal pipe 1 is provided with the hose pull-out preventing projections 5 and 6 at the ends thereof.
The oil absorbing and expanding rubber ring 2 is fitted on the outer periphery of the end of the low pressure power steering hose 3, and then the end of the low pressure power steering hose 3 is fitted on the outer periphery of the fitted oil absorbing and expanding rubber ring 2. The plate clamp tool 4 or a wire clasp (not shown) is clamped on the outer periphery of the low-pressure power steering hose 3 that has been fitted.

Here, the oil absorbing and expanding rubber ring 2 is a rubber having a property of swelling and expanding when absorbing oil, for example, power steering hydraulic oil. As this kind of rubber, chloroprene rubber, ethylene propylene diene rubber,
There are blended rubbers of chloroprene rubber and ethylene propylene diene rubber, blended rubbers of ethylene propylene diene rubber and butyl rubber, and the like. Although vulcanized rubber is desirable as these rubbers, unvulcanized rubber can be used.

Here, the chloroprene rubber and the ethylene propylene diene rubber are 50% at 70 ° C. and 15% at 120 ° C. when immersed in the power steering hydraulic oil of
Swells 0%.

Further, the inner diameter of the oil absorbing and expanding rubber ring 2 is made equal to or smaller than the outer diameter of the metal pipe 1.

[0020]

EFFECTS OF THE INVENTION According to the low pressure power steering hose fastening portion and the fastening method of the present invention, abnormal high temperature, low temperature, high humidity, low humidity and the like are repeated over a long period of time to alleviate stress in the low pressure power steering hose. If a gap is created between the outer peripheral surface of the metal pipe and the inner peripheral surface of the low-voltage power steering hose, and the hydraulic oil in the pipe leaks through the gap, the leaked hydraulic oil absorbs the oil. The expandable rubber ring is swollen to eliminate the gap between the outer peripheral surface of the metal pipe and the inner peripheral surface of the low pressure power steering hose, and as a result, further leakage of hydraulic oil can be completely eliminated. , Industrially useful.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing a low pressure power steering hose fastening portion and a fastening method thereof according to the present invention.

FIG. 2 is a front explanatory view showing a conventional low pressure power steering hose fastening portion and a fastening method therefor.

[Explanation of symbols]

 1 Metal Pipe 2 Oil Absorption Inflatable Rubber Ring 3 Low Pressure Power Steering Hose 4 Plate Clamps 5, 6 Hose Removal Prevention Projection

Claims (4)

[Claims] 1. A low-voltage power steering hose fastening portion, wherein an end portion of a low-pressure power steering hose is fitted around the end portion of a metal pipe, and a clamp tool is attached to the outer circumference of the fitted low-pressure power steering hose. At
A low pressure power steering hose fastening part, characterized in that an oil absorbing expansive rubber ring is fitted between the outer periphery of the end of the metal pipe and the fitted low pressure power steering hose. 2. An oil absorbing expansive rubber ring selected from chloroprene rubber, ethylene propylene diene rubber, a blended rubber of chloroprene rubber and ethylene propylene diene rubber, and a blended rubber of ethylene propylene diene rubber and butyl rubber. The low-voltage power steering hose fastening portion according to claim 1, wherein 3. The low pressure power steering hose fastening portion according to claim 1, wherein the inner diameter of the oil absorbing and expanding rubber ring is equal to or smaller than the outer diameter of the metal pipe. 4. An oil absorbing and expanding rubber ring is fitted on the outer circumference of an end of a metal pipe, and then an end of a low pressure power steering hose is fitted on the outer circumference of the fitted oil absorbing and expandable rubber ring. After that, a clamp tool is attached to the outer periphery of the fitted low pressure power steering hose, and a method for fastening a low pressure power steering hose fastening portion.