JPH0444958Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is applicable to pressure fluid hoses, more specifically, power steering systems used on the high-pressure side of hydraulic circuits that connect the hydraulic pump and gearbox of power steering devices such as automobiles. This product relates to hoses for pressure fluids, such as hoses for commercial use.

BACKGROUND ART Power steering devices for automobiles and the like use positive displacement pumps such as vane pumps, and therefore pulsations occur on the high-pressure side of a hydraulic circuit that connects the pump and a gearbox.

As a pressure fluid hose that can absorb the pulsation caused by such a pump, a spiral flexible tube or an elastic flexible tube in which one or more elastic strips are tightly spirally wound inside a rubber elastic hose is used. is inserted,
It is known that the free end of this flexible tube faces the outlet of the elastic hose at a predetermined distance (US Pat. No. 3,323,305).

Problems to be Solved by the Invention In the conventional pressure fluid hose described above, pulsation is reduced by the space between the flexible tube and the elastic hose and the elastic hose, but the pulsation is reduced by the space between the flexible tube and the outlet of the elastic hose. Since there is nothing in between, the fluid with a pulsating component flowing inside the flexible tube smoothly flows from the free end of the flexible tube toward the outlet of the elastic hose, causing pulsation between the flexible tube and the elastic hose. The problem is that it cannot be absorbed sufficiently.

The purpose of this invention is to provide a pressure fluid hose that solves the above problems and has a high pulsation absorption effect.

Means for Solving the Problem The pressure fluid hose according to this invention has a flexible tube inserted inside an elastic hose, and the free end of the flexible tube faces the outlet of the elastic hose at a predetermined distance. In the fluid hose, a fluid control member is provided between the free end of the flexible tube and the outlet of the elastic hose, and the fluid flowing inside the flexible tube is connected to the flexible tube side of the fluid control member. A first flow path is formed on the elastic hose outlet side of the fluid control member to direct the fluid in the space between the flexible tube and the elastic hose toward the elastic hose outlet. It is characterized in that a second channel for flowing water is formed.

Effect The fluid flowing inside the flexible tube is
It flows through a first flow path of the fluid control member into the space between the flexible tube and the elastic hose, and then flows toward the outlet of the elastic hose through a second flow path of the fluid control member. As a result, pulsation is sufficiently absorbed between the flexible tube and the elastic hose.

Embodiment Hereinafter, an embodiment in which this invention is applied to a power steering hose will be described with reference to the drawings.

1 and 2 show a first embodiment.

As shown in FIG. 1, the pressure fluid hose has a spiral flexible tube 2 inserted inside a reinforced rubber elastic hose 1, and the inlet end of the flexible tube 2 is on the inlet side of the elastic hose 1. The flexible tube 2 is fixed to a cap 3 at the end, and the free end (outlet side end) 2a of the flexible tube 2 faces the cap 4 at the outlet end of the elastic hose 1 at a predetermined distance. In addition, in the following explanation, elastic hose 1 and flexible tube 2
Let the entrance side be the right and the exit side be the left. elastic hose 1
The respective caps 3 and 4 at both ends have outer tubular portions 3b and 4b fixed concentrically to the outside of inner tubular portions 3a and 4a, and the two tubular portions 3b and 4 of the cap 3 on the inlet side,
3b, and the outlet end of the elastic hose 1 is sandwiched between the two cylindrical parts 4a and 4b of the mouthpiece 4 on the outlet side. The right end of the inner cylindrical portion 4a of the mouthpiece 4 on the outlet side serves as the outlet 5 of the elastic hose 1, and the elastic hose outlet 5 and the free end 2 of the flexible tube 2
a are opposed to each other with a predetermined interval therebetween. The flexible tube 2 is made up of one or more elastic tubes tightly wound spirally, and the inlet end thereof is inserted into the inner cylindrical portion 3a of the base 3 and caulked, so that the gap between the two is closed. It's blocked. The outer diameter of the flexible tube 2 is smaller than the inner diameter of the elastic hose 1, and an annular space 6 is formed therebetween.

A substantially cylindrical fluid control member 10 is provided between the free end 2a of the flexible tube 2 within the elastic hose 1 and the elastic hose outlet 5. The fluid control member 10 has an outer diameter approximately equal to the inner diameter of the elastic hose 1, and is tightly fitted into the outlet side of the elastic hose 1. The left end portion of the fluid control member 10 is in contact with the right end portion of the inner cylindrical portion 4a of the mouthpiece 4 on the outlet side.
The free end 2a of the flexible tube 2 is fitted into a hole 11 formed at the right end of the fluid control member 10. On the right side of the fluid control member 10, there is a first flow path 12 for causing the fluid flowing in the flexible tube 2 to flow toward the annular space 6, and on the left side of the fluid control member 10, there is a first flow path 12 in the annular space 6. a second for flowing fluid towards the elastic hose outlet 5;
A flow path 13 is formed. That is, a hole 12a that continues to the hole 11 in which the flexible tube 2 is fitted is formed on the right side of the fluid control member 10, and the fluid control member 10 is inserted from the left end of this hole 12a.
Four radial holes 12b extending diagonally to the right to the outer peripheral surface of the fluid control member 10 are formed at positions that equally divide the fluid control member 10 into four in the circumferential direction. In addition, the fluid control member 1
Radial holes 12 are placed at positions that divide the outer peripheral surface of 0 into four equal parts.
A groove 12c is formed parallel to the axis extending from the end of the fluid control member 10 to the right end of the fluid control member 10. Then, these holes 12a, 12b and groove 12c
As a result, a first flow path 12 is formed. On the other hand, a groove 13a parallel to the axis extending from the right end to near the left end of the fluid control member 10 is located between the four grooves 12c of the first flow path 12 and at a position that equally divides the outer circumferential surface of the fluid control member 10. are formed, and four radial holes 13b are formed from the left end of these grooves 13a toward the center of the fluid control member 10. Further, a hole 13c communicating with the elastic hose outlet 5 is formed at the left end of the fluid control member 10, and four radial holes 13b are connected to the right end of this hole 13c. A second flow path 13 is formed by these grooves 13a and holes 13b, 13c.

Inner cylindrical portion 3a of the cap 3 on the inlet side of the elastic hose 1
The fluid that has flowed inside the flexible tube 2 flows toward the right side through the holes 12a, 12 and the groove 12c of the first flow path 12, and enters the annular space 6.
to go into. Then, the fluid that has entered the annular space 6 flows through the groove 13a and holes 13b, 13 of the second flow path 13.
c, and enters the inner cylindrical portion 4a of the mouthpiece 4 on the outlet side from the elastic hose outlet 5. In this way, the fluid flowing inside the flexible tube 2 does not directly flow into the elastic hose outlet 5, but always enters the annular space 6 and then flows into the elastic hose outlet 5. The pulsation is sufficiently absorbed between the two.

In conventional pressure fluid hoses, since the free end of the flexible tube is not supported at all, there is a problem in that this portion hits the inner surface of the elastic hose and causes damage. On the other hand, in the pressure fluid hose of the first embodiment, the free end 2a of the flexible tube 2 is fitted into and supported by the fluid control member 10 which is tightly fitted into the outlet side of the elastic hose 1. There is no risk that this portion will hit the inner surface of the elastic hose 2 and cause damage.

FIG. 3 shows the outlet side portion of the pressure fluid hose of the second embodiment. This hose is connected to the fluid control member 2
It is the same as that of the first embodiment except for 0, and the first
The same parts as in the embodiment are given the same reference numerals.

In the case of the second embodiment, the outer diameter of the fluid control member 20 is smaller than the inner diameter of the elastic hose 1, and the grooves 12c and 13a of the flow paths 12 and 13 of the first embodiment are replaced by the fluid control member 20 and the elastic hose 1. An annular channel 2 between
1 is formed. Almost similarly to the case of the first embodiment, there is a hole 22a following the hole 11 into which the flexible tube 2 is fitted, and four radial shapes extending diagonally to the right from the left end of this hole 22a to the outer peripheral surface of the fluid control member 20. The hole 22b allows the first
A flow path 22 is formed. Further, a cross-shaped groove 23a is formed on the left end surface of the fluid control member 20, thereby forming a second flow path 23.

The fluid that has flowed through the flexible tube 2 flows toward the right side through the holes 22 a and 22 b of the first flow path 22 and enters the annular space 6 through the right side portion of the annular flow path 21 . Then, the fluid that has entered the annular space 6 flows from the annular flow path 21 to the second flow path 23.
It passes through the groove 23a and enters the inner cylindrical portion 4a of the mouthpiece 4 on the outlet side from the elastic hose outlet 5.

FIG. 4 shows the outlet side portion of the pressure fluid hose of the third embodiment. This hose also has the fluid control member 3
It is the same as that of the first embodiment except for 0, and the first
The same parts as in the embodiment are given the same reference numerals.

In the case of the third embodiment, the fluid control member 30 has an outer diameter approximately equal to the inner diameter of the elastic hose 1, and is tightly fitted on the outlet side of the elastic hose 1. The left end of the fluid control member 30 is in contact with the right end of the inner cylindrical portion 4a of the mouthpiece 4 on the outlet side, and the right end is a little apart from the free end 2a of the flexible tube 2. A recess 31a having a parabolic cross section is formed on the right end surface of the fluid control member 30, thereby allowing the first flow path 31
is formed. On the other hand, a groove 32 parallel to the axis extending from the right end to near the left end of the fluid control member 30 is located at a position dividing the outer peripheral surface of the fluid control member 30 into four equal parts.
a are formed, and four radial holes 32b extending diagonally to the left toward the center of the fluid control member 30 are formed from the middle part of these grooves 32a.
Further, a hole 32c communicating with the elastic hose outlet 5 is formed on the left side of the fluid control member 30.
Four radial holes 32b are connected to the right end portion of c. These grooves 32a and holes 3
A second flow path 32 is formed by 2b and 32c.

The fluid flowing through the flexible tube 2 hits the bottom of the recess 31a of the first flow path 31, changes its direction to the right, flows to the right, and enters the annular space 6. Then, the fluid in the annular space 6 passes through the groove 32a and the holes 32b, 32c of the second flow path 32, and enters the inner cylindrical portion 4a of the mouthpiece 4 on the outlet side from the elastic hose outlet 5.

The fluid control members 10, 20, and 30 are made of a suitable material such as metal, synthetic resin, or rubber. Moreover, it can also be constructed by appropriately combining these materials. For example, in the third embodiment, the fluid control member 30 is made of metal, and only the bottom of the recess 31a of the first flow path 31 with which the fluid flowing inside the flexible tube 2 collides is made of rubber, synthetic resin, etc. It is also possible to construct it from an elastic material.

Effects of the invention According to the pressure fluid hose of this invention, as described above, the fluid flowing inside the flexible tube does not flow directly to the outlet of the elastic hose, but the fluid control member creates a space between the flexible tube and the elastic hose. , and then to the elastic hose outlet, thus effectively absorbing pulsations between the flexible tube and the elastic hose. Therefore, the length of the elastic hose and flexible tube can be shortened to achieve cost reduction and compactness.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view (cross-sectional view taken along the line in FIG. 2) of a pressure fluid hose showing a first embodiment of the invention; FIG. 2 is an enlarged cross-sectional view along the line shown in FIG. 1;
FIG. 3 is a longitudinal sectional view of the outlet side portion of the pressure fluid hose showing the second embodiment, and FIG. 4 is a longitudinal sectional view of the outlet side portion of the pressure fluid hose showing the third embodiment. 1...Elastic hose, 2...Flexible tube, 2a...Free end, 5...Elastic hose outlet, 6
...Annular space, 10,20,30...Fluid control member, 12,22,31...First flow path, 13,2
3, 32...second flow path.

Claims (1)

[Claims for Utility Model Registration] A pressure fluid hose in which a flexible tube is inserted inside the elastic hose, and the free end of the flexible tube faces the outlet of the elastic hose at a predetermined distance. A fluid control member is provided between the free end and the outlet of the elastic hose, and the fluid control member, on the flexible tube side, directs the fluid flowing inside the flexible tube to the space between the flexible tube and the elastic hose. A first flow path is formed on the elastic hose outlet side of the fluid control member, and a second flow path is formed on the elastic hose outlet side of the fluid control member for causing the fluid in the space between the flexible tube and the elastic hose to flow toward the elastic hose outlet. A pressure fluid hose characterized by being formed with.