JP2555602B2 - Piping for power steering device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe used for transmitting pressure fluid, and more specifically, to a pressure fluid supply device and a fluid pressure operating device in a power steering device of an automobile. Regarding the piping that connects the.

[Prior Art] Generally, a pipe used for transmitting pressure fluid in a power steering apparatus of an automobile is operated by a pressure fluid supply device 1 such as a pump and pressure fluid, as shown in a block diagram of FIG. High pressure side pipe 3 for pressure transmission connecting the fluid pressure operating device 2 and low pressure side pipe 4 used for discharge
It has become.

By the way, steel pipes and rubber hoses are used for these power steering systems.The former is easy to form by bending and is suitable for complicated piping routes, while the latter is intended for pulsation absorption. Although it is usually a straight pipe, a bent pipe may be used for convenience of piping.

In that case, conventionally, a rubber hose has been manufactured in a non-vulcanized state by inserting it into a core metal that has been bent into a predetermined shape, and then vulcanizing and molding the hose.

[Problems to be Solved by the Invention] In a bend-molded hose according to the related art, when a pressure is applied, the bent portion tends to extend, and in practical use, the bending movement of the rubber hose occurs and interferes with other pipes. There was a drawback that Further, since the rubber hose used for the high-pressure side pipe 3 has a plurality of braided reinforcement layers incorporated therein, it has high rigidity, and it takes a lot of time and labor to perform the piping work in the engine room of a complicated automobile.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide a pipe for a power steering device, in which the pipe is easy even when there is a curved portion.

[Means for Solving Problems] The present invention is characterized in that a curved portion of a rubber hose for piping is provided with a synthetic resin coating portion for fixing the curved portion.

[Operation] In the present invention, since the outer circumference of the curved portion of the rubber hose is covered with a synthetic resin and subjected to bending, use of this for gravity steering piping facilitates piping, and
The bending motion when pressure is applied does not interfere with other pipes or the like, and on top of that, the noise of the pipes due to pulsation also interferes with each other and is reduced.

[Embodiment] An embodiment of a bending hose for piping for a power steering apparatus according to the present invention will be described below with reference to the drawings.

FIG. 3 is a cross-sectional view of a conventional rubber hose used for power steering device piping. In the figure, the rubber hose has an inner rubber layer 5 with excellent oil resistance, a braided reinforcement layer 6 for increasing pressure resistance, and an outer side with excellent weather resistance. It is composed of a rubber layer 7.

FIG. 1 is a perspective view of a bend-molded rubber hose according to this embodiment, and in the drawing, reference numeral 8 is a covering portion that constitutes a main part of this embodiment.

Hereinafter, a method of providing the covering portion 8 on the curved portion of the rubber hose will be described. First, a portion that will be the curved pipe of the rubber hose is attached to a die manufactured in a predetermined curved shape, and then the die is sealed to fix the rubber hose. To do. Then, a thermoplastic resin such as nylon is melted and poured from the injection port of the mold, or monomer casting nylon, liquid resin or the like is injected. After injecting a predetermined amount, by waiting for the synthetic resin to be fixed, the mold is opened to obtain a bend-molded rubber hose which is formed into a predetermined curved shape and whose outer periphery is covered with the covering portion 8.

The bending rigidity of the covering portion 8 can be arbitrarily selected by changing the material of the synthetic resin, the thickness and the shape of the covering, and the like. Further, the synthetic resin is a thermoplastic one which is easy to handle, but a thermosetting one such as an unsaturated polyester, an epoxy resin or a polyurethane resin may be used, and a glass fiber or a rubber elastic body is used to improve durability. It is also possible to blend etc.

Next, FIG. 2 shows a case where a plurality of rubber hoses are bent and molded, and the shape of the coating layer 8 is different from the case of FIG. 1, and by using a plurality of rubber hoses by bending them integrally. Piping work becomes easier than before.

As described above, according to this embodiment, bending with the synthetic resin,
The use of the molded rubber hose facilitates the piping work, and does not interfere with other pipes due to the curved movement when pressure is applied.

[Advantages of the Invention] According to the present invention, the drawbacks in the conventional piping are eliminated,
It is possible to provide a pipe for a power steering device that can be easily piped even when there is a curved portion and that can reduce noise in the pipe portion.

[Brief description of drawings]

FIG. 1 is a perspective view of a bend-molded rubber hose showing an embodiment of the present invention, FIG. 2 is a perspective view of a bend-molded rubber hose showing another embodiment of the present invention, and FIG. 3 is a cross-sectional view of a conventional rubber hose. FIG. 4 is a block diagram showing piping for a power steering device. 1: Pressure fluid supply device, 2: Fluid pressure operation device, 3: High pressure side pipe, 4: Low pressure side pipe, 5: Inner rubber layer, 6: Braided reinforcing layer, 7: Outer rubber layer, 8: Cover part.

Claims (1)

(57) [Claims] 1. A pipe for a power steering device, comprising a steel pipe and a rubber hose connected between a pressure fluid supply device and a fluid pressure actuating device of the power steering device, wherein nylon and a monomer are provided on the outer circumference of a curved pipe portion of the rubber hose. A pipe for a power steering device, characterized by being coated with one kind of synthetic resin for curving fixation selected from cast nylon, unsaturated polyester, epoxy resin, and polyurethane resin.