JPH1163362A - Pulsation pressure absorbing hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulsation pressure absorbing hose that can absorb pulsation in a wide range from a low frequency band to a high frequency band with simple constitution. SOLUTION: A flexible tube 12 is coaxially inserted with play in a hose body 2, and oil sump space 20 is provided between the outer periphery of the flexbile tube 12 and the hose inner peripheral surface 2a. A cap member is fitted to the tip of the flexible tube 12, and a cylindrical member 16 formed of an elastic body with an outer diameter smaller than the inner diameter of the hose body 2 is fitted to the outer periphery of the cap member. The oil sump space 20 can therefore absorb pulsation of a specified frequency band generated at a hydraulic pump so as to be made an accumulator chamber. An oil passage between the tip part of the flexbile tube 12 and the hose inner peripheral surface 2a is set narrow by the outer periphery of the cylindrical member 16 fitted to the outer periphery of the cap member, so as to have structure provided with a throttle T at the inlet of the accumulator chamber 20, and oil passes through this throttle T to absorb pulsation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit, such as a power steering unit of an automobile, which is provided in a hydraulic circuit using a hydraulic pump as a pressure generating source to absorb a pulsation of the hydraulic pressure generated by the hydraulic pump. Pulsating pressure absorbing hose that can be used.

[0002]

2. Description of the Related Art A power steering unit of an automobile includes a hydraulic pump that sends out a hydraulic pressure, a steering device such as a gear and a cylinder that is operated by the hydraulic pressure, and a hydraulic pressure steering device that is connected between the hydraulic pump and the steering device. And a low-pressure hose for returning oil pressure from the steering device side to the hydraulic pump side.

[0003] In such a unit, the hydraulic pressure discharged from the hydraulic pump and supplied to the steering device side cannot avoid generation of pulsation by the hydraulic pump,
This pulsation may cause the high pressure hose and the steering device to vibrate and generate abnormal noise.

In order to solve this problem, a pulsating pressure absorbing hose in which a flexible pipe is inserted into a high-pressure hose is known as represented by, for example, the invention described in US Pat. No. 3,323,305.

In this pulsation pressure absorbing hose, a gap between the high-pressure hose and the flexible pipe is used as an accumulator chamber, and the pulsation is absorbed by interference between a pressure wave of oil reflected from the accumulator chamber and a pressure wave of oil passing through the inside of the flexible pipe. Is what you do.

[0006]

The pulsation generated by the hydraulic pump has a different frequency range for each vehicle type (for each type of power steering unit). Therefore, in the conventional pulsating pressure absorbing hose described above, the length of the high-pressure hose is changed, one or two flexible pipes are inserted into the high-pressure hose, the flow direction of oil flowing through the flexible pipe is changed, Alternatively, a pulsation in a predetermined frequency range is absorbed by combining these methods.

However, if a plurality of types of pulsating pressure absorbing hoses having different lengths of high-pressure hoses, the number of flexible tubes to be inserted, and the like are manufactured so as to be compatible with each vehicle type,
Manufacturing costs rise.

In addition, the length of the pulsating pressure absorbing hose is limited due to the layout restrictions in the power steering unit, and even if a long pulsating pressure absorbing hose is manufactured to absorb pulsation in a predetermined frequency range. In some cases, the pulsation cannot be sufficiently absorbed because the pulsation cannot be incorporated into the unit.

Furthermore, when the high-pressure hose is bent, the tip of the flexible pipe inserted into the high-pressure hose comes into contact with the inner peripheral surface of the hose, and the inner peripheral surface of the high-pressure hose is easily damaged.

The present invention has been developed in view of these problems, and can absorb pulsations in a high range from a low frequency range to a high frequency range. It is an object of the present invention to provide a pulsating pressure absorbing hose capable of reducing the manufacturing cost as a simple configuration free from restrictions and preventing the inner peripheral surface of the high pressure hose from being damaged by the end of the flexible tube. And

[0011]

According to a first aspect of the present invention, there is provided a pulsating pressure absorbing hose provided in a fluid pressure circuit using a fluid pressure pump as a pressure source. A pulsating pressure absorbing hose for absorbing pulsation of fluid pressure generated by inserting a flexible pipe from one end of the hose body to a middle thereof, and having a fluid pool between an outer circumference of the flexible pipe and an inner circumferential surface of the hose body. A throttle adjusting member for providing a space and for forming a throttle in a fluid passage communicating with the fluid reservoir space is attached to a distal end portion of the flexible tube.

According to a second aspect of the present invention, in the pulsating pressure absorbing hose according to the first aspect, a cylindrical throttle adjusting member made of an elastic body having an outer diameter smaller than the inner diameter of the hose body is used as the flexible pipe. And a predetermined gap is provided between the inner peripheral surface of the hose body and the outer peripheral surface of the throttle adjusting member.

According to a third aspect of the present invention, there is provided the pulsating pressure absorbing hose according to the first aspect, wherein the outer diameter of the hose is substantially the same as the inner diameter of the hose body, and a fitting hole is formed at the center of the shaft. A restricting member having a shape is fitted by fitting the tip of the flexible tube into the fitting hole, and a small-diameter hole communicating with the fluid reservoir space is formed in the axial direction of the restricting member.

According to a fourth aspect of the present invention, in the pulsating pressure absorbing hose according to the third aspect, a communication groove is formed on an outer periphery of the throttle adjusting member, the communication groove extending between both end surfaces of the throttle adjusting member. When attached to the end of the flexible tube,
A space surrounded by the inner peripheral surface of the hose body and the communication groove is provided as a small-diameter hole communicating with the fluid reservoir space.

According to a fifth aspect of the present invention, in the pulsating pressure absorbing hose according to the third aspect, a communication groove which is continuous between both end faces of the throttle adjusting member is formed on a peripheral surface of the fitting hole of the throttle adjusting member. When formed and mounted on the distal end of the flexible tube, a space surrounded by the outer peripheral surface of the flexible tube and the communication groove is provided as a small-diameter hole communicating with the fluid reservoir space.

According to a sixth aspect of the present invention, in the pulsating pressure absorbing hose according to the first aspect, a cap member for holding a spirally wound shape of a metal band forming the flexible tube is attached to a tip of the flexible tube. In addition, the outer shape of the cap member was formed into a truncated cone shape, a blister shape, or the like having an enlarged diameter portion having an outer peripheral surface having a curvature bulging toward the inner peripheral surface of the hose body.

According to a seventh aspect of the present invention, there is provided a pulsating pressure absorbing hose disposed in a fluid pressure circuit using a fluid pressure pump as a pressure generating source and absorbing a pulsation of fluid pressure generated by the fluid pressure pump. Then, the two hose bodies are connected to each other in series via an intermediate caulking member, and a flexible tube is inserted into one of the hose bodies so that the flexible tube is inserted between the outer periphery of the flexible tube and the inner peripheral surface of the one hose body. Provide a fluid pool space,
The intermediate caulking member supports the distal end of the flexible tube, and the intermediate caulking member has a small-diameter hole communicating between the fluid reservoir space and the inside of the other hose body.

Further, the invention according to claim 8 is the same as the invention according to claim 7.
8. The pulsating pressure absorbing hose according to claim 7, wherein the intermediate caulking member is provided integrally with a diameter adjusting member capable of finely adjusting the diameter of the small diameter hole. .

[0019]

According to the pulsating pressure absorbing hose of the first aspect of the present invention, the fluid reservoir space provided between the outer periphery of the flexible pipe and the inner peripheral surface of the hose body has a predetermined space generated by the fluid pressure pump. It becomes an accumulator room that can absorb pulsations in the frequency range. And since the diaphragm adjusting member is provided at the tip of the flexible tube, the structure is such that the diaphragm is provided at the entrance of the accumulator. Thus, when pulsation occurs in the fluid pressure pump, pulsation in a predetermined frequency range is absorbed by controlling the flow of fluid when the fluid passes through a restrictor provided at the inlet of the accumulator chamber, and the pulsation in another frequency range is further stored in the accumulator chamber. Pulsation is absorbed.

Therefore, the pulsating pressure absorbing hose of the present invention does not require a large-volume accumulator chamber (that is, does not require a long hose to increase the volume of the fluid reservoir space), but does not restrict the throttle adjusting member. Pulsation can be sufficiently absorbed by the effect, and a short pulsation pressure absorbing hose can be obtained. Therefore, the hose can be easily incorporated in a fluid pressure circuit without being restricted by a layout.

According to the pulsating pressure absorbing hose of the second aspect, the effect of the first aspect can be obtained, and when the outer diameter of the throttle adjusting member is changed, the gap (diameter of the throttle) with the hose body is reduced. Since the frequency range of the pulsation that can be changed and absorbed can be changed, only a diaphragm adjusting member having an outer diameter different for each vehicle type needs to be attached to the distal end portion of the flexible pipe.
Therefore, it is not necessary to manufacture a plurality of types of pulsating pressure hoses having different hose lengths, the number of flexible tubes to be inserted, and the like as in the related art, so that the manufacturing unit price of the pulsating pressure absorbing hose can be reduced. Further, since the throttle adjusting member is formed of an elastic body, even if the hose main body is bent and the throttle adjusting member contacts the inner peripheral surface of the hose main body, the inner peripheral surface of the hose is not damaged.

According to the pulsating pressure absorbing hose of the third aspect, the effect of the first aspect can be obtained, and the number of small holes can be increased or decreased, or the diameter of the small holes can be changed. You can also change the frequency range of the pulsation that can be absorbed,
Since only the throttle adjusting member having a different number of small-diameter holes and a different hole diameter needs to be attached to the distal end portion of the flexible pipe for each vehicle type, the manufacturing cost of the pulsating pressure absorbing hose can be reduced.

Further, according to the pulsation pressure absorbing hose of the fourth aspect, the effect of the third aspect can be obtained, and the communication groove is formed on the outer periphery of the throttle adjusting member. Since the area of contact with the inner peripheral surface of the hose body is reduced, the throttle adjusting member can be smoothly inserted into the hose body.

According to the pulsating pressure absorbing hose of the fifth aspect, the effect of the third aspect can be obtained, and since the communication groove is formed in the peripheral surface of the fitting hole, the diaphragm adjusting member and the flexible pipe are formed. Since the contact area with the tip of the flexible pipe is reduced, the aperture adjusting member can be easily attached to the tip of the flexible tube.

According to the pulsating pressure absorbing hose of the sixth aspect, a cap member for holding the spirally wound shape of the metal strip forming the flexible tube is attached to the tip of the flexible tube, and the cap member is attached to the flexible tube. Since the outer shape is formed in a truncated cone shape, a blister shape, or the like having an enlarged diameter portion whose outer peripheral surface having a curvature swells toward the inner peripheral surface of the hose body, the size of the enlarged diameter portion of the cap member is reduced. If this is changed, the gap (diaphragm diameter) with the hose body changes, and the frequency range of the pulsation that can be absorbed can be changed. Therefore, only the cap member having a different diameter of the enlarged portion for each vehicle type needs to be attached to the tip of the flexible pipe. . Therefore, it is not necessary to manufacture a plurality of types of pulsating pressure hoses having different hose lengths, the number of flexible tubes to be inserted, and the like as in the related art, so that the manufacturing unit price of the pulsating pressure absorbing hose can be reduced. Further, since the cap member has the outer peripheral surface having a curvature, even if the hose body is bent and the cap member contacts the inner peripheral surface of the hose main body, the inner peripheral surface of the hose is not damaged.

According to the pulsating pressure absorbing hose of the present invention, the small-diameter hole formed in the intermediate caulking member serves as a throttle provided in the fluid passage communicating with the fluid reservoir space (accumulator chamber). Accordingly, when a pulsation occurs in the fluid pressure pump, the pulsation in a predetermined frequency range is absorbed by controlling the fluid flow when the fluid passes through the throttle, and the pulsation in another frequency range is absorbed in the accumulator chamber. Therefore, the same effect as that of the first aspect can be obtained. Further, since the intermediate caulking member functions as a throttle adjusting member at the same time as the connection of the two hose bodies, the manufacturing cost of the pulsating pressure absorbing hose can be further reduced.

Further, according to the pulsation pressure absorbing hose of the eighth aspect, the effect of the seventh aspect can be obtained, and the frequency range of the pulsation to be absorbed can be easily set even after being incorporated in the fluid pressure circuit. Can be changed.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment according to the present invention.
It is a figure showing a pulsation pressure absorption hose of an embodiment.

First, the structure will be described. At both ends of the pulsating pressure absorbing hose, a nipple 4 fitted inside both ends of the hose body 2 and a fastening ring 6 for fastening the outer periphery of the end of the hose body 2 are provided. A connection fitting 10 including a nut 8 rotatably engaged with the nipple 4 is connected. A discharge port of a hydraulic pump (not shown) is connected to the connection fitting 10 shown on the left side of FIG. 1 so that oil flows in the direction of the arrow.

A flexible pipe 12 is inserted coaxially into the hose body 2 and an oil sump space 2 is provided between the outer circumference of the flexible pipe 12 and the inner circumferential surface 2a of the hose.
0 is defined.

The flexible tube 12 is a tube member formed by spirally winding a metal strip. One end of the flexible tube 12 is fitted in the nipple 4 located on the left side of FIG. , A cap member 14 for holding a spirally wound metal band is attached. Reference numeral 14a
Is an oil discharge port 14a. A cylindrical member 16 having an outer diameter smaller than the inner diameter of the hose body 2 and formed of an elastic body is fitted around the outer periphery of the cap member 14.

Next, FIG. 4 shows a model equivalent to the pulsating pressure absorbing hose having the above-described configuration. As described above, the space between the outer peripheral surface of the flexible pipe 12 and the inner peripheral surface of the hose body 2 is defined. The formed oil sump space 20 can absorb the pulsation in a predetermined frequency range generated by the hydraulic pump, and thus serves as an accumulator chamber (hereinafter, referred to as the accumulator chamber 20). The distal end of the flexible tube 12 has a narrow oil passage between the inner peripheral surface 2a of the hose and the outer peripheral surface of the cylindrical member 16 fitted to the cap member 14. The structure shown in FIG. When the cylindrical member 16 having a large outer diameter is externally fitted to the cap member 14, the aperture diameter of the aperture T is reduced. When the cylindrical member 16 having a small outer diameter is externally fitted to the cap member 14, the aperture diameter of the aperture T is increased. Therefore, the cylindrical member 16 functions as a diaphragm adjusting member (hereinafter, referred to as the diaphragm adjusting member 16).

When the pulsation pressure absorbing hose of this embodiment is used as a high-pressure hose of a power steering unit of an automobile, when pulsation is generated by a hydraulic pump, the pulsating pressure absorption hose is used when oil passes through a throttle T provided at an inlet of the accumulator chamber 20. The pulsation in a predetermined frequency range can be absorbed by the oil flow control, and the pulsation in another frequency range can be absorbed in the accumulator chamber 20.

For this reason, the large-volume accumulator chamber 20
(Even if the oil storage space 20 between the flexible pipe 12 and the hose body 2 does not have a large volume)
As a result, the pulsation can be sufficiently absorbed, so that a compact pulsation pressure absorbing hose having a short length can be obtained. Therefore, when the power steering unit is incorporated in the power steering unit, the power steering unit can be easily mounted without being restricted by the layout.

Further, when the outer diameter of the aperture adjusting member 16 is changed, the aperture diameter of the aperture T changes, and the frequency range of pulsation that can be absorbed by the aperture T also changes. In this case, only the aperture adjusting member 16 having a different outer diameter for each vehicle type needs to be fitted to the cap member 14. Therefore, the hose length and the flexible pipe 1
Since it is not necessary to manufacture a plurality of kinds of pulsating pressure absorbing hoses having different numbers of insertions of 2, etc., the manufacturing unit price of the pulsating pressure absorbing hose can be reduced.

Further, even if the hose body 2 is bent and the tip of the flexible tube 12 comes into contact with the inner peripheral surface 2a of the hose, the diaphragm adjusting member 16 formed of an elastic body is attached to the tip of the flexible tube 12. , Hose inner peripheral surface 2a
Is not scratched.

Next, FIGS. 5 and 6 show a second embodiment of the present invention. 1 to 4
The same reference numerals are given to the same components as those of the first embodiment shown in FIG.

In the present embodiment, the aperture adjusting member 30 is replaced with the cap member 14 instead of the aperture adjusting member 16 of the first embodiment.
Is fitted outside. The aperture adjusting member 30 is a cylindrical member made of an elastic body having a fitting hole 32 that is fitted to the cap member 14 at the center of the shaft and having an outer diameter set to be substantially the same as the inner diameter of the hose body 2. The accumulator chamber 20 is disposed inside the hose body 2 so as to close the accumulator chamber 20. And
The aperture adjusting member 30 has a plurality of communication holes 36 communicating from one end face 34a facing the accumulator chamber 20 to the other end face 34b.

According to the pulsating pressure absorbing hose having the above-described structure, the plurality of communication holes 36 formed in the throttle adjusting member 30 serve as throttle holes to form the throttle T. Therefore, when pulsation is generated by the hydraulic pump, the throttle hole ( The pulsation in a predetermined frequency range can be absorbed by the flow rate control when the oil passes through the communication hole 36, and the pulsation in another frequency range can be absorbed in the accumulator chamber 20.

Therefore, similarly to the first embodiment, the pulsation can be sufficiently absorbed by the throttle T without using the accumulator chamber 20 having a large volume, so that a compact pulsation pressure absorbing hose having a short length can be obtained. When incorporated in a unit, it can be easily mounted without any restrictions on layout.

When the number of the communication holes 36 of the aperture adjustment member 30 is changed or the diameter of the communication holes 36 is changed, the frequency range of the pulsation that can be absorbed by the aperture T also changes. Aperture adjusting members 30 having different numbers and diameters
Of the pulsating pressure absorbing hose can be reduced because only the outer peripheral portion of the pulsating pressure absorbing hose needs to be fitted to the cap member 14.

Further, since the outer periphery of the throttle adjusting member 30 is in contact with the inner peripheral surface 2a of the hose, there is no possibility that the inner peripheral surface 2a of the hose is damaged. Next, what is shown in FIG. 7 and FIG.
9 shows a third embodiment of the present invention.

In the present embodiment, the aperture adjusting member 40 is externally fitted to the cap member 14. This aperture adjustment member 40 is
A cylindrical member made of an elastic body having a fitting hole 42 in which the cap member 14 is fitted in the center of the shaft and having an outer diameter set to be substantially the same as the inner diameter of the hose body 2.
0 is disposed in the hose main body 2 so as to close it.
The outer periphery of the aperture adjusting member 40 is connected from one end surface 44a facing the accumulator chamber 20 side to the other end surface 4a.
A plurality of communication grooves 46 continuous to 4b are formed.

According to the pulsating pressure absorbing hose having the above structure, the throttle T is formed as a throttle hole in a space surrounded by the plurality of communication grooves 46 formed in the throttle adjusting member 40 and the inner circumferential surface 2a of the hose. When pulsation occurs, pulsation in a predetermined frequency range can be absorbed by flow rate control when oil passes through the throttle hole, and pulsation in another frequency range can be absorbed in the accumulator chamber 20.

Therefore, the same operation and effect as in the second embodiment can be obtained. Also, since the communication groove 46 is formed on the outer periphery of the throttle adjusting member 40, the contact area with the inner circumferential surface 2a of the hose is reduced, so that the throttle adjusting member 40 attached to the tip of the cap member 12 is inserted into the hose body 2. When doing so, the aperture adjustment member 40 can be inserted smoothly.

Next, FIGS. 9 and 10 show a fourth embodiment of the present invention. In the present embodiment, the aperture adjustment member 50 is externally fitted to the cap member 14.

The aperture adjusting member 50 is a cap member 1
4 is a cylindrical member made of an elastic body having an outer diameter set to be approximately the same as the inner diameter of the hose body 2 and having a fitting hole 52 formed at the center of the shaft, the hose being adapted to close the accumulator chamber 20. It is arranged in the main body 2. The fitting hole 52 of the aperture adjusting member 50 is provided in the accumulator chamber 2.
A plurality of continuous communication grooves 56 are formed from one end face 54a facing the zero side to the other end face 44b.

According to the pulsating pressure absorbing hose having the above-described structure, the throttle T is formed by using the space surrounded by the plurality of communication grooves 56 formed in the throttle adjusting member 50 and the cap member 14 as the throttle hole, so that the pulsation is generated by the hydraulic pump. When this occurs, the pulsation in a predetermined frequency range can be absorbed by the flow rate control when the oil passes through the throttle hole, and the pulsation in another frequency range can be absorbed in the accumulator chamber 20.

Therefore, the same operation and effect as in the second embodiment can be obtained. Further, since the communication groove 56 is formed in the fitting hole 52 of the aperture adjustment member 50, the contact area with the cap member 14 is reduced, so that the aperture adjustment member 50 can be easily mounted on the cap member 14.

Next, FIGS. 11 and 12 show a fifth embodiment of the present invention, in which the cap member 60 functions as a diaphragm adjusting member.

That is, the cap member 60 of the present embodiment
Is a metal member provided with a through-hole 62 and has a truncated cone-like appearance. The opening on one end side of the through hole 62 holds the flexible tube 12 in a spirally wound shape of the metal band, and the opening on the other end side of the through hole 62 serves as an oil discharge port 64. I have.

According to the above configuration, the distal end of the flexible tube 12 is connected to the outer periphery (the position indicated by reference numeral 66 in FIG. 12) of the cap member 60 which is close to the inner peripheral surface 2a of the cap member 60. Since the oil passage between the surface 2a is set to be narrow, a structure in which the throttle T is provided at the inlet of the accumulator chamber 20 is provided.

As a result, the pulsation can be sufficiently absorbed by the throttle T formed by the outer periphery of the cap member 60, so that the pulsation pressure absorbing hose can be formed into a short tube. It can be easily mounted without the above restrictions.

Also, if the outer diameter of the enlarged diameter portion side of the cap member 60 is changed, the aperture diameter of the aperture T changes, and the frequency range of pulsation that can be absorbed by the aperture T also changes. Are different from each other, only the cap members 60 having different outer diameters on the enlarged-diameter portion side for each vehicle type are connected to the flexible pipe 1.
2, it is possible to reduce the manufacturing unit price of the pulsating pressure absorbing hose.

Further, even when the hose body 2 is bent and the cap member 60 comes into contact with the inner peripheral surface 2a of the hose, the cap member 60 having an external truncated cone shape comes into contact with the inner peripheral surface 2a of the hose in a line contact state. Therefore, the inner surface 2a of the hose is not damaged.

The cap member having the function of the aperture adjusting member is not limited to the above-described embodiment. For example, as shown in FIG. 13, a blister tube 66 protruding toward the hose inner peripheral surface 2a is used as the cap member. Even in this case, the same operation and effect as in the fifth embodiment can be obtained.

FIGS. 14 and 15 show a pulsating pressure absorbing hose according to a sixth embodiment. This pulsating pressure absorbing hose is constituted by two hose bodies 72A, 72B are connected in series, and the distal end of the flexible tube 12 loosely inserted into one of the hose bodies 72A is fixed by the intermediate caulking member 74.

As shown in FIG. 15, the intermediate caulking member 70 is a cylindrical metal member, and caulks for caulking and fixing the ends of the two hose bodies 72A and 72B to the outer peripheral sides of both ends in the axial direction. Portions 74a and 74b are formed, and a fitting hole 76 in which the tip of the flexible tube 12 fits is formed in the center of the shaft. The intermediate caulking member 70 has a plurality of communication holes 80 communicating from one end face 78a facing the accumulator chamber 20 provided in the one hose body 72A to the other end face 78b. 70 also functions as a diaphragm adjustment member.

According to the pulsating pressure absorbing hose having the above-described structure, the plurality of communication holes 80 formed in the intermediate caulking member 60 serve as throttle holes to form the throttle T. Therefore, when pulsation is generated by the hydraulic pump, the throttle hole ( The pulsation in a predetermined frequency range can be absorbed by the flow rate control when the oil passes through the communication hole (80), and the pulsation in another frequency range can be absorbed in the accumulator chamber 20.

Therefore, the same operation and effect as those of the other embodiments can be obtained. Also, the intermediate caulking member 70
At the same time as the connection of the hose bodies 72A and 72B, they also function as a throttle adjusting member, so that the unit cost of manufacturing the pulsating pressure absorbing hose can be further reduced.

FIG. 16 shows a pulsation pressure absorbing hose according to a seventh embodiment, in which a caulking portion 92 formed on the outer peripheral side of both ends in the axial direction of the intermediate caulking member 90 is shown.
The two hose bodies 72A, 72B are connected in series by a and 92b, and one of the hose bodies 72A is inserted into a fitting hole 94 formed in the center of the shaft of the intermediate caulking member 90.
The distal end portion of the flexible tube 12 loosely inserted therein is fixed. The intermediate caulking member 90 is formed with a communication hole 98 communicating from one end face 96a facing the accumulator chamber 20 provided in one hose body 72A to the other end face 96b.

Here, in the present embodiment, the large diameter hole 100 is formed on the outer periphery of the intermediate caulking member 80,
A female screw hole 102 is formed from the bottom of the large diameter hole 100 to the communication hole 98. A male screw plug 104 that can enter the inside of the communication hole 98 is screwed into the female screw hole 102. Reference numeral 106 denotes an O-ring for maintaining liquid tightness between the female screw hole 92 and the male screw plug 94.

According to the pulsating pressure absorbing hose having the above-described structure, when the amount of entry of the male screw plug 104 into the communication hole 98 is increased, the diameter of the throttle becomes a small throttle T, and the amount of entry of the male screw plug 104 into the communication hole 98 is reduced. When it is decreased, the aperture T becomes a large aperture diameter.

As described above, the pulsating pressure absorbing hose of the present embodiment can obtain the same operation and effect as those of the other embodiments, and can reduce the diameter of the throttle T by merely operating the amount of the male screw plug 104 to enter. Since the fine adjustment can be performed, the frequency range of the pulsation to be absorbed can be easily changed even after being incorporated in the power steering unit.

FIGS. 17 to 19 show a pulsation pressure absorbing device according to an eighth embodiment in which two hose bodies 72A and 72B are connected in series, similarly to the sixth and seventh embodiments described above. It shows a hose.

The pulsating pressure absorbing hose of the present embodiment comprises a first intermediate caulking member 110 for fixing the distal end of the flexible tube 12 while being connected to the end of one hose body 72A,
A second intermediate caulking member 112 connected to the end of the other hose body 72B, a first and a second intermediate caulking member 110,
A third intermediate caulking member 114 is provided between the first and second intermediate caulking members 112, and a diaphragm adjusting member 116 is provided in the third intermediate caulking member 114 and adjusts a diaphragm diameter.

That is, the first intermediate caulking member 110
A cylindrical portion 110b having a fitting hole 110a at the center of the shaft into which the tip of the flexible tube 12 is fitted;
A diameter-enlarging portion 110c whose diameter is increased from one end in the axial direction of 0b to form a hexagonal outer periphery, and a cylindrical portion 110 of the diameter-enlarging portion 110c
b formed on the end face that does not face
A caulking portion 110d for caulking and fixing an end portion of A, an O-ring 110e mounted in an annular storage groove formed on an end surface of the enlarged diameter portion 110c facing the cylindrical portion 110b side, and a shaft on the outer periphery of the cylindrical portion 110b The enlarged diameter portion 11 is formed so as to extend in the direction.
0c, and the tapered triangular groove 110f whose groove depth increases as the distance from 0c increases, and the triangular groove 110f extends from the surface of the enlarged diameter portion 110c facing the actuator chamber 20 side.
And a communication hole 110g communicating with the surface facing the side.

The second intermediate caulking member 112 is a cylindrical member having an outer periphery formed in a hexagonal shape. A female screw hole 112b screwed into the formed male screw portion 110g, and a third intermediate caulking member 11
O mounted in an annular storage groove formed on the end face facing the four sides
This is a member including a ring 112c and a communication hole 112d communicating from the end face facing the third intermediate caulking member 114 side to the opposite end face.

The third intermediate caulking member 114 is
The intermediate caulking member 110 is a cylindrical member having a female screw 114a formed on an inner peripheral surface having a larger diameter than the inner cylindrical portion 110b. Further, the aperture adjusting member 116 is a third caulking member 1
14 is a cylindrical member having a length in the axial direction shorter than that of the first intermediate caulking member 110, and has an inner diameter portion substantially the same diameter as the inner cylindrical portion 110b of the first intermediate caulking member 110. A mating male screw 116a is formed on the outer periphery.

According to the pulsating pressure absorbing hose having the above structure, the communication hole 110 g formed in the first intermediate caulking member 110 is
A communication hole 112 formed in the second intermediate caulking member 112;
The space defined between the inner diameter portion of the diaphragm adjusting member 116 and the tapered triangular groove 110f formed on the outer periphery of the cylindrical portion 110b is the diaphragm T.

The diaphragm adjusting member 116 is connected to the enlarged diameter portion 11.
Moving to 0c side (arrow Y ₁ direction in FIG. 17), the internal space narrows The diaphragm diameter is maximum aperture T next to the triangular groove 110f, aperture adjustment member 116 and the second crimping member 112
Moving to the side (arrow Y ₂ direction in FIG. 17), the triangular groove 11
Since the internal space of 0f becomes large, the aperture T becomes a large aperture.

When adjusting the throttle of the pulsating pressure absorbing hose, it is necessary to adjust the throttle diameter to a predetermined value before attaching the third intermediate caulking member 114 between the first and second intermediate caulking members 112 and 114. Then, the aperture adjusting member 116 in the third intermediate caulking member 116 is moved in the axial direction. After the position adjustment of the aperture adjustment member 116 is completed, the aperture adjustment member 11 is attached to the cylindrical portion 110b of the first intermediate caulking member 112.
6 and the third intermediate caulking member 114, and then the second intermediate caulking member 112 is mounted while screwing the female screw hole 112b into the male screw portion 110g of the cylindrical portion 110b. Finally, a tightening member such as a spanner is used. By rotating the first and second intermediate caulking members 112 and 114 in opposite directions, the third intermediate caulking member 116 is held.

Therefore, the pulsating pressure absorbing hose of the present embodiment can obtain the same operation and effect as those of the other embodiments, and can use the throttle adjusting member 116 engaged in the third intermediate caulking member 116 as a shaft. Just move in the direction
Can be finely adjusted, so that the same operation and effect as those of the other embodiments can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a pulsating pressure absorbing hose of a first embodiment in which a flexible tube is inserted into one hose body.

FIG. 2 is a view taken along line II-II of FIG.

FIG. 3 is a view taken along line III-III in FIG. 2;

FIG. 4 is a diagram modeling the pulsating pressure absorbing hose of the first embodiment.

FIG. 5 is a diagram showing a cross section of a pulsating pressure absorbing hose according to a second embodiment of the present invention.

FIG. 6 is a view taken along line VI-VI of FIG. 5;

FIG. 7 is a view showing a cross section of a pulsating pressure absorbing hose according to a third embodiment of the present invention.

FIG. 8 is a view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a view showing a cross section of a pulsating pressure absorbing hose according to a fourth embodiment of the present invention.

FIG. 10 is a view taken along line XX of FIG. 9;

FIG. 11 is a view showing a cross section of a pulsating pressure absorbing hose according to a fifth embodiment of the present invention.

FIG. 12 is a view taken along line XII-XII in FIG. 10;

FIG. 13 is a view showing a modification of the fifth embodiment.

FIG. 14 is a view showing a pulsating pressure absorbing hose formed by connecting two hose bodies with an intermediate caulking member.

FIG. 15 is a sectional view of a main part of a pulsating pressure absorbing hose of a sixth embodiment.

FIG. 16 is a sectional view of a main part of a pulsating pressure absorbing hose of a seventh embodiment.

FIG. 17 is a sectional view of a main part of a pulsating pressure absorbing hose of an eighth embodiment.

FIG. 18 is a perspective view showing a first intermediate caulking member, a third intermediate caulking member, and a throttle adjusting member that constitute the pulsating pressure absorbing hose of the eighth embodiment.

FIG. 19 is a perspective view showing a second intermediate caulking member constituting the pulsating pressure absorbing hose of the eighth embodiment.

[Explanation of symbols]

 2, 72A, 72B Hose main body 2a Hose inner peripheral surface 12 Flexible pipe 16, 30, 40, 50, 116 Throttle adjusting member 20 Oil reservoir space (accumulator chamber) 32, 52 Fitting holes 36, 80, 98 Communication holes 46, 56 Communication groove 60, 66 Cap member 76 Intermediate caulking member 104 Male screw plug 110 First intermediate caulking member 110f Triangular groove 112 Second intermediate caulking member 114 Third intermediate caulking member

Claims (8)

[Claims] 1. A pulsating pressure absorbing hose disposed in a fluid pressure circuit using a fluid pressure pump as a pressure generating source to absorb pulsation of fluid pressure generated by the fluid pressure pump, wherein the pulsating pressure absorbing hose is provided from one end of a hose body. Inserting the flexible tube halfway, providing a fluid reservoir space between the outer periphery of the flexible tube and the inner peripheral surface of the hose body, and a throttle adjusting member that forms a restrictor in a fluid passage communicating with the fluid reservoir space, A pulsating pressure absorbing hose, which is attached to a distal end of the flexible tube. 2. A tube-shaped throttle adjusting member made of an elastic body having an outer diameter smaller than the inner diameter of the hose body, is fitted over the distal end of the flexible pipe, and the inner peripheral surface of the hose body and the throttle adjusting member are fitted. The pulsating pressure absorbing hose according to claim 1, wherein a predetermined gap is provided between the hose and the outer peripheral surface of the hose. 3. A cylindrical aperture adjusting member having an outer diameter substantially the same as the inner diameter of the hose body and having a fitting hole formed in the center of the shaft, wherein the tip of the flexible pipe is fitted into the fitting hole. 2. The pulsating pressure absorbing hose according to claim 1, wherein a small diameter hole communicating with the fluid reservoir space is formed in an axial direction of the throttle adjusting member. 4. A communication groove which is continuous between both end faces of the aperture adjusting member is formed on an outer periphery of the aperture adjusting member, and when the hose is attached to a distal end of the flexible pipe, an inner peripheral surface of the hose body and the inner peripheral surface of the hose main body are connected to each other. The pulsating pressure absorbing hose according to claim 3, wherein a space surrounded by the communication groove is provided as a small-diameter hole communicating with the fluid reservoir space. 5. A communication groove which is continuous between both end surfaces of the aperture adjusting member is formed in a peripheral surface of a fitting hole of the aperture adjusting member, and when the flexible adjusting tube is mounted on a distal end of the flexible tube, an outer periphery of the flexible tube is provided. 4. The pulsating pressure absorbing hose according to claim 3, wherein a space surrounded by a surface and the communication groove is provided as a small-diameter hole communicating with the fluid reservoir space. 6. A cap member for holding a spirally wound shape of a metal band forming the flexible tube is attached to a distal end of the flexible tube, and the outer shape of the cap member is changed to an outer peripheral surface having a curvature. 2. The pulsating pressure absorbing hose according to claim 1, wherein the hose is formed in a truncated cone shape, a blister shape, or the like having an enlarged diameter portion bulging toward an inner peripheral surface of the main body. 7. A pulsating pressure absorbing hose disposed in a fluid pressure circuit using a fluid pressure pump as a pressure source and absorbing pulsation of fluid pressure generated by the fluid pressure pump, comprising two hose bodies. Are connected in series via an intermediate caulking member, and a flexible tube is inserted into one of the hose bodies to provide a fluid pool space between the outer periphery of the flexible tube and the inner peripheral surface of the one hose body. A pulsating pressure absorbing hose, wherein a tip of the flexible pipe is supported by a caulking member, and a small-diameter hole communicating between the fluid reservoir space and the inside of the other hose body is formed in the intermediate caulking member. . 8. The pulsating pressure absorbing hose according to claim 7, wherein a diameter adjusting member capable of finely adjusting the diameter of the small diameter hole is provided integrally with the intermediate caulking member.