JPH0135999Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a high pressure hose assembly.
In particular, the strands of the reinforcing layer of the hose body are wound alternately in opposite directions, and the ends of the strands are folded alternately from the outer and inner sides of a pair of bead rings to create a bead. A bead presser fitting that presses the bead portion from the outer circumferential side is attached to the hose main body, and an external device is attached to the bead presser fitting of the hose main body via a separate bead support fitting that supports the bead portion from the inner circumferential side. By having a connecting structure, the pressure resistance strength can be increased without increasing the cross-sectional shape of the connecting portion of the hose body.

[Conventional technology]

Conventionally, high-pressure hose assemblies have a spiral structure in which the reinforcing layer wires of the hose body intersect in opposite directions, with connecting fittings attached to both ends. Since high-pressure hose assemblies with large diameters have problems with pressure resistance at the connection between the hose body and the connecting fittings, the inventor first developed a method to achieve sufficient pressure resistance without increasing the number of parts of the connecting fittings. A patent application was filed for the resulting high-pressure hose assembly. This high-pressure hose assembly is made by wrapping the reinforcing layer's strands at both ends alternately from the outer and inner sides of a pair of bead rings for each layer, and folding them back.
This bead portion is fitted into a bead receiving portion of a ring-shaped connecting fitting, so that the connecting fitting is assembled integrally with the hose body (see Japanese Patent Laid-Open No. 61-6483).

[Problem to be solved by the invention] In the high-pressure hose assembly of the above application, when a tensile force is generated in the reinforcing wire due to the internal pressure of the hose body, the bead ring is tightened and the bead receiving part of the connecting fitting is tightened. Because it is crimped, the bead part does not slip out of the connection fitting, and unless the reinforcing wire breaks, there will be no separation between the hose body and the connection fitting, so it has a simple structure and high pressure resistance. It's summery.

However, in this high-pressure hose assembly, the withstand pressure that prevents the hose body from slipping out of the connection fitting is due to the rigidity of the bead ring around which the reinforcing wire is wound, so in order to increase the pressure resistance, In this case, a bead ring with a large cross-sectional area must be used to increase the rigidity, which increases the outside diameter and/or thickness of the fitting, which increases the stiffness of the hose body. There still remains a problem to be solved in terms of miniaturizing the structure of the connecting part with the connecting fitting.

The object of this invention is to solve the above-mentioned problems and provide a high-pressure hose assembly that has a small cross-sectional shape at the connection part of the hose body and has strong pressure resistance.

[Means for solving problems]

A plurality of reinforcing layers are arranged in which reinforcing strands are wound alternately in opposite directions in the length direction of the hose body, and a pair of both ends of each reinforcing strand of the reinforcing layer is arranged. A bead portion is provided around the bead ring by overlapping a layer folded from the outer circumferential side to the inner circumferential side and a layer folded from the inner circumferential side to the outer circumferential side, and the inner circumferential side of the reinforcing layer is covered with tube rubber, and the outer circumferential side is a hose body each covered with a cover rubber and provided with a seal portion having a cross-sectional shape substantially similar to the bead portion on the inner circumferential side of the bead portion, and an opening having an inner diameter approximately equal to the outer diameter of the reinforcing layer of the hose body. It is a ring-shaped body having a concave bead presser formed on one end side with a bead presser having a diameter approximately equal to the outer diameter of the bead of the hose main body, and the bead presser is connected to the outer periphery of the bead of the hose main body. It is a ring-shaped body having a bead holding fitting assembled integrally with the hose main body in contact with the side thereof, and an opening having an inner diameter approximately equal to the inner diameter of the hose main body, the ring-shaped body having a bead holding fitting attached to the hose main body on one end side. A bead support fitting separate from the hose body is formed by extending a bead support portion having an outer diameter approximately equal to the inner diameter of the hose body, and the bead support portion of the bead support fitting is connected to the inside of the bead portion of the hose body. The bead holding fitting is configured to be connectable to an external device via the bead supporting fitting while being in close contact with the circumferential seal portion.

[Effect]

The bead of the hose body is tightened from the outer and inner sides by the bead holding fitting and bead supporting fitting, and the bead supporting fitting shares the pressure resistance of the bead, so the rigidity of the bead ring can be reduced. Also, the pressure resistance strength at the connection part of the hose body is increased.

〔Example〕

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention. In the same figure, numeral 10 is a hose body, 2
Reference numeral 2 indicates a bead holding fitting, and numeral 26 indicates a bead supporting fitting.

The hose body 10 includes a tube rubber 11 and two reinforcing wires 12 and 14 on the outer periphery of the tube rubber 11.
A reinforcing layer 16 that is layered and wound in a spiral shape, and bead portions 19 at both ends of the reinforcing layer 16,
It is composed of a cover rubber 17 that covers the outer peripheral surface of the reinforcing layer 16. The reinforcing wires 12 on the lower layer side and the reinforcing wires 14 on the upper layer side of the reinforcing layer 16 are wound so as to alternately cross in opposite directions with respect to the length direction of the hose body 10. Both ends 13 of the wire 12 are folded back from the inner circumferential side to the outer circumferential side of a pair of bead rings 18 disposed on the outer edge side of the tube rubber 11, and are wound approximately once around the bead rings 18. Both ends 15 of the upper layer wire 14 are folded over the lower layer wire 12 wound around the bead ring 18 and folded back from the outer circumferential side to the inner circumferential side. The reinforcing layer 16 is cut at the position where the reinforcing layer 16 has been wound approximately once, and both ends of the reinforcing layer 16 form bead portions 19 .

The material for the reinforcing wires 12 and 14 is appropriately selected from high-tensile steel wire, aromatic polyamide fiber, etc., depending on the usage conditions of the hose.

Each strand 12 around the bead ring 18,
The ends 13 and 15 of the wire 14 are overlapped in the opposite manner to the above, the end 15 of the wire 14 on the upper layer side is first folded around the bead ring 18, and then the end of the wire 12 on the lower layer side is placed on top of it. The portions 13 may be overlapped and folded back.

The outer circumferential side and the inner circumferential side of the bead portion 19 are as follows:
cover rubber 17 and tube rubber 11 respectively
The tube rubber is coated with a cross-sectional shape substantially similar to that of the bead portion 19, and the seal portion 20 is a tube rubber coated from the inner peripheral side to the outer edge portion of the bead portion 19.

The bead retainer 22 is a ring-shaped body provided with an opening 23 having an inner diameter approximately equal to the outer diameter of the reinforcing layer 16 of the hose body 10, and has a plurality of holes on its outer edge for connection to an external connecting device. bolt hole 2
4 is drilled. This bead presser fitting 22 has a bead presser section 25 cut out in the axial direction from one end surface in a concave shape with a diameter substantially equal to the outer diameter of the bead section 19 .

The above-mentioned bead presser metal fitting 22 is constructed by inserting the reinforcing layer 16 into the opening 23 so that the cover rubber 17
It is assembled integrally with the hose main body 10 by adhering it to the hose body 10.

The bead support fitting 26 is a ring-shaped body having the same outer diameter as the bead holding fitting 22, but has a thinner wall and an opening 2 with an inner diameter approximately equal to the inner diameter of the hose body 10.
7 and a bolt hole 28 on the same circumference as the pitch circle of the bolt hole 24 of the bead holding fitting 22,
A bead support portion 29 having an outer diameter approximately equal to the inner diameter of the bead portion 19 of the hose main body 10 is formed extending in the axial direction from one end surface side.
It is a separate part.

When using the high pressure hose assembly with the above configuration, the bead support part 29 of the bead support fitting 26
Insert the bead support part 29 toward the hose main body 10 side, and insert the bead support part 29 into the seal part 20 on the inner peripheral side of the bead part 19.
Closely contact. In this state, the bolt holes 24 and 28 of the bead presser metal fitting 22 and the bead support metal fitting 26,
A bolt is inserted into a bolt hole of an external connecting device (not shown), and a nut is tightened to the bolt to connect to the external connecting device.

In the high pressure hose assembly connected to an external connecting device in this way, the bead portion 19 of the hose body 10 is connected to the bead presser portion 2 of the bead presser fitting 22.
5 from the outer circumferential side, and is firmly clamped while being supported from the inner circumferential side by the bead support part 29 of the bead support fitting 26, so even if it receives the internal pressure of the hose body 10, the bead There is no way that Division 19 will be left out.

In particular, the bead support fitting 26 is attached to the hose body 1.
The bead support part 29 shares the withstand pressure of the bead ring 18 when subjected to an internal pressure of 0, and transmits this withstand stress to the bolt of the bolt hole 28, its outer edge, etc., and disperses it in multiple directions. Therefore, there is no need to increase the rigidity of the bead ring 19 even if the internal pressure is increased. Therefore, a large withstand pressure can be obtained with a relatively small rigid bead ring without increasing the outer diameter and wall thickness of the bead presser metal fitting 22 and the bead support metal fitting 26.

Note that the high-pressure fluid in the hose body 10 is transferred between the hose body 10 and the bead support fitting because the bead support portion 25 of the bead support fitting 22 is crimped to the seal portion 20 on the inner peripheral side of the bead portion 19 with a wide contact area. 26, and since the bead support fitting 26 is connected to an external connection device via another gasket, high pressure fluid will not leak from between the bead support fitting 26 and the external connection device. It won't leak.

In order to further enhance the sealing function between the seal portion 20 of the hose body 10 and the bead support fitting 26, the seal portion 20 of the hose body 10 is
It is preferable to cover the bead portion 19 with a thicker layer of rubber from the inner circumferential side to the outer circumferential side so as to protrude outward in the axial direction from the end surface of the bead holding fitting 22. In this case, Hose body 10
When the bead support metal fitting 26 is attached to the bead support metal fitting 26, a gap 30 is formed between the bead holding metal fitting 22 and the bead support metal fitting 26, so that the tightening force when bolting the bead holding metal fitting 22 and the bead support metal fitting 26 is reduced. As a result, the bead support part 29 of the bead support fitting 26 can be strongly pressed against the seal part 20 of the hose main body 10.

[Effect of idea]

As explained above, according to this invention, the bead presser fitting that presses the bead part of the hose body from the outer circumferential side is assembled integrally with the hose body, and the bead part is held by the bead support fitting separate from the hose body. The structure is such that the bead is supported from the inner circumferential side and the bead presser is connected to an external device via the bead support to sandwich the bead, so the bead support can be easily fixed without increasing the cross-sectional area of the bead ring. The stress sharing increases the pressure resistance, and a high-pressure hose assembly with high pressure resistance can be obtained without increasing the cross-sectional shape of the connecting portion of the hose body.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention. In the figure, 10 is the hose body, 11 is tube rubber, 12, 14 are reinforcing wires, 13, 15 are both ends of the reinforcing wires, 16 is a reinforcing layer, 17 is a cover rubber, 18 is a bead ring, 19 is the bead part, 2
0 is a seal portion, 22 is a bead presser, 23 is an opening, 24 is a bolt hole, 25 is a bead presser, 2
6 is a bead support fitting, 27 is an opening, 28 is a bolt hole, and 29 is a bead support part.

Claims (1)

[Scope of utility model registration request] A plurality of reinforcing layers are arranged in which reinforcing strands are wound alternately in opposite directions in the length direction of the hose body, and a pair of both ends of each reinforcing strand of the reinforcing layer is arranged. A bead portion is provided around the bead ring by overlapping a layer folded from the outer circumferential side to the inner circumferential side and a layer folded from the inner circumferential side to the outer circumferential side, and the inner circumferential side of the reinforcing layer is covered with tube rubber, and the outer circumferential side is a hose body each covered with a cover rubber and provided with a seal portion having a cross-sectional shape substantially similar to the bead portion on the inner circumferential side of the bead portion, and an opening having an inner diameter approximately equal to the outer diameter of the reinforcing layer of the hose body. It is a ring-shaped body having a concave bead presser formed on one end side with a bead presser having a diameter approximately equal to the outer diameter of the bead of the hose main body, and the bead presser is connected to the outer periphery of the bead of the hose main body. It is a ring-shaped body having a bead holding fitting assembled integrally with the hose main body in contact with the side thereof, and an opening having an inner diameter approximately equal to the inner diameter of the hose main body, the ring-shaped body having a bead holding fitting attached to the hose main body on one end side. A bead support fitting separate from the hose body is formed by extending a bead support portion having an outer diameter approximately equal to the inner diameter of the hose body, and the bead support portion of the bead support fitting is connected to the inside of the bead portion of the hose body. A high-pressure hose assembly characterized in that a bead holding fitting can be connected to an external device via a bead supporting fitting while being in close contact with a circumferential seal portion.