JP2001099339A - Check valve - Google Patents

Abstract

(57) Abstract: A spring is biased by a valve seat member fixed to a valve housing having a valve hole and a valve seat having the valve hole facing the center in a direction to be seated on the valve seat. A guide cylinder for accommodating the spherical valve body and guiding the opening and closing operation of the valve body is provided in series, and a plurality of communication holes communicating with an outlet chamber formed between the guide cylinder and the valve housing correspond to the valve body. Thus, in the check valve provided on the side wall of the guide cylinder, generation of abnormal noise due to vibration of the valve body is reliably prevented. At least at the time of fluid flow, a rod (25) having one end connected to a valve body (8) is slidably fitted in a valve hole (14), and the rod (25) is provided at a plurality of locations on the outer surface of the rod (25) at circumferential intervals. A flow passage 26 that allows fluid to flow is formed between the outer surface of the valve and the inner surface of the valve hole 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve seat having a valve hole and a valve seat having the valve hole facing the center and fixed to a valve housing. A guide cylinder for accommodating the energized spherical valve body and guiding the opening and closing operation of the valve body is provided in series, and a plurality of communication holes communicating with an outlet chamber formed between the guide cylinder and the valve housing correspond to the valve body. The present invention relates to a check valve provided on a side wall of a guide cylinder at a portion where a check valve is provided.

[0002]

2. Description of the Related Art Conventionally, such a check valve is already known, for example, from Japanese Patent Application Laid-Open No. 9-20218.

[0003]

By the way, when the valve element is opened and the valve element is separated from the valve seat, the fluid flows through the gap between the valve element and the guide cylinder so as to flow around the valve body so as to go behind the valve element. In a flowing check valve, the valve body vibrates due to the disturbance of the fluid flow behind the valve body, and abnormal noise is generated due to hydraulic hunting caused by the vibration of the valve body.

Therefore, in the check valve disclosed in Japanese Patent Application Laid-Open No. 9-20218, a plurality of communication holes are provided in a portion of the side wall of the guide cylinder corresponding to the valve element, and the fluid is disturbed behind the valve element. When the valve is opened, most of the fluid is prevented from flowing behind the valve body so that the fluid flows from the side of the valve body toward the outlet chamber.

However, the flow resistance of the fluid is increased only by the communication hole provided in the guide cylinder at the side of the valve body, so that the communication hole must be provided in the guide cylinder even on the rear side of the valve body.
Therefore, it is difficult to completely eliminate the turbulence of the fluid behind the valve body, and even with the check valve disclosed in the above publication, it is difficult to reliably prevent the generation of abnormal noise due to the vibration of the valve body.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a check valve capable of reliably preventing generation of abnormal noise due to vibration of a valve body.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a valve seat member fixed to a valve housing includes a valve hole communicating with an inlet passage provided in the valve housing; A valve seat is provided with the valve hole facing the center, and a guide cylinder that houses a spherical valve element that can be seated on the valve seat and guides the opening and closing operation of the valve element is connected to the valve seat member. A valve spring for urging the valve body in a direction to seat the valve body on the valve seat, and is formed between the guide cylinder and the valve housing through an outlet passage provided in the valve housing. A plurality of communication holes communicating with the outlet chamber are provided on a side wall of the guide cylinder at a portion corresponding to the valve body, and at least at the time of fluid flow, a rod having one end connected to the valve body slides in the valve hole. Is fitted and the rod Wherein the flow passage to permit flow of fluid is formed between the inner surface of the outer surface and the valve hole of the rod at a plurality of positions spaced in the circumferential direction of the surface.

According to such a configuration, when the valve is opened and the valve is separated from the valve seat, most of the communication between the plurality of communication holes formed in the side wall of the guide cylinder corresponding to the valve is connected to the outlet chamber. The fluid is allowed to circulate, and the disturbance of the fluid behind the valve body can be minimized. Moreover, one end of the rod slidably fitted in the valve hole is connected to the valve body, and the valve body is sandwiched between the valve spring and the rod, so that it is supported by the valve seat member. The vibration of the valve body is regulated by the rod, and even if turbulence occurs due to a part of the fluid flowing behind the valve body, it is possible to reliably prevent the vibration of the valve body, and thus to generate abnormal noise. It can be reliably prevented.

The invention according to claim 2 is the same as the above-described claim 1.
In addition to the configuration of the invention described in the above, the rod is slidably fitted in the valve hole and forms the plurality of flow passages between the rod and an inner surface of the valve hole; The moving part has a frusto-conical portion that is integrally connected to the opposite side of the valve body and has a smaller diameter as it moves away from the sliding part. The portion where the rod slides in contact is made as short as possible, so that the flow resistance of the fluid flowing between the valve hole and the rod can be made as small as possible. In addition, the fluid is smoothly guided by the truncated cone portion, and the fluid is disturbed. Can be prevented.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, at least a center portion of at least one end face of both end faces of the rod which is separate from the valve body is provided. A mortar-shaped recess capable of accommodating a part of the valve body and contacting the valve body is formed. According to such a configuration, the rod is more reliably connected to the valve body, and Vibration can be more reliably prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a check valve, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 2 is an enlarged view of a main part of FIG. 1 in a state.

First, in FIG. 1, this check valve is used, for example, in a vehicle brake system, and is provided on a valve housing 5, a valve seat member 6 fixed to the valve housing 5, and the valve seat member 6. A spherical valve body 8 that can be seated on the valve seat 7, a guide cylinder 9 that accommodates the valve body 8 and guides the opening and closing operation of the valve body 8, and the valve body 8 in the seating direction on the valve seat 7. A valve spring 10 that is housed in the guide cylinder 9 by exerting a biasing spring force.

The valve housing 5 has a small-diameter hole 11 having one end closed, and a small-diameter hole 1 formed to have a larger diameter than the small-diameter hole 11.
A medium-diameter hole 12 having one end coaxially connected to the other end of the medium-diameter hole 1, and having one end coaxially connected to the other end of the medium-diameter hole 12 Is provided on the outer surface of the valve housing 5.

The valve seat member 6 has a small-diameter cylindrical portion 6b coaxially and integrally connected to one end of a large-diameter cylindrical portion 6a. The small-diameter cylindrical portion 6b is coaxially protruded into the small-diameter hole 11. The large-diameter cylindrical portion 6a is fixed to the valve housing 5 by press-fitting the large-diameter cylindrical portion 6 into the medium-diameter hole 12 as described above.

The valve seat 7 is provided at one end surface of the valve seat member 6, that is, at the center of one end of the small-diameter cylindrical portion 6b, and is formed in a tapered shape so that the spherical valve body 8 can be seated thereon. In the small-diameter cylindrical portion 6b, a valve hole 14 is provided coaxially with one end opening facing the center of the valve seat 7.

A filter 15 is fixedly arranged in the large-diameter cylindrical portion 6a of the valve seat member 6. On the other hand, the large diameter hole 13 is fitted with a closing member 17 provided with an annular seal member 16 on the outer periphery that makes elastic contact with the inner surface of the large diameter hole 13, and the closing member 17 is separated from the large diameter hole 13. A retaining ring 18 that engages with the closing member 17 is fitted into the large-diameter hole 13 to prevent the above-mentioned phenomenon. An inlet chamber 19 is formed in the valve housing 5 between the valve seat member 6 and the filter 15 and the closing member 17, and the valve housing 5 is provided with an inlet passage 20 communicating with the inlet chamber 19.

The guide cylinder 9 is formed in a cylindrical shape having an end wall 9a at the end opposite to the valve seat member 6, and the open end of the guide cylinder 9 is connected to the small-diameter cylinder of the valve seat member 6. It is connected to the valve seat member 6 by being swaged to the portion 6b. This guide tube 9
The valve body 8 is housed therein, and a valve spring 10 is provided between the end wall 9 a of the guide cylinder 9 and the valve body 8.

An outlet chamber 21 is formed between the guide cylinder 9 and the valve housing 5, and an outlet passage 22 communicating with the outlet chamber 21 is provided in the valve housing 5. In addition, valve body 8
A plurality of communication holes 23... Are formed in the side wall of the guide cylinder 9 at portions corresponding to the above, so that the inside of the guide cylinder 9 communicates with the outlet chamber 21. A communication hole 24 communicating with 21 is provided.

According to the present invention, one end of the valve hole 8 of the valve seat member 6 is applied to the valve 8 when the valve 8 is released from the valve seat 7, that is, when a fluid such as brake fluid flows. The rod 25 to be brought into contact is slidably fitted.

Referring also to FIG. 2, a flat surface 25a parallel to the axis of the rod 25 is provided at a plurality of, for example, three, positions circumferentially spaced on the outer surface of the rod 25 formed in a solid rod shape. Are provided between the outer surface of the rod 25 and the inner surface of the valve hole 14 at portions corresponding to the flat surfaces 25a, 25a,. 26 are formed.

In addition, at least one end surface of the rod 25, in this embodiment, at the center of both end surfaces, mortar-shaped recesses 27, 27 capable of accommodating a part of the valve body 8 and contacting the valve body 8 are formed. Is done. That is, the rod 25 may be fitted to the valve hole 14 by arranging either of both ends along the axial direction on the valve body 8 side, and the concave portion 27 is arranged on the opposite side to the valve body 8. In order to prevent this, the concave portions 27, 27 are formed at the center of both end surfaces of the rod 25.

Next, the operation of the first embodiment will be described. As shown in FIG. 3, the fluid acting on the valve body 8 from the side of the flow passages 26 between the inner surface of the valve hole 14 and the outer surface of the rod 25 is shown. In the valve-opening state in which the pressure in the valve-opening direction overcomes the spring force in the valve-closing direction by the valve spring 10 and the valve body 8 is separated from the valve seat 7, the valve body 8 corresponds to the valve body 8 on the side wall of the guide cylinder 9. Outlet chamber 2 from a plurality of communication holes 23, 23,.
1 through which most of the fluid can flow.
By reducing the amount of fluid flowing to the side, it is possible to minimize disturbance of fluid behind the valve element 8.

Further, the rod 25 slidably fitted in the valve hole 14 is urged by the fluid pressure flowing through the valve hole 14 so as to bring one end of the rod 25 into contact with the valve body 8. As a result, the valve element 8 is held between the valve spring 10 and the rod 25. As a result, the vibration of the valve body 8 is regulated by the rod 25 supported by the valve seat member 6, and even if a disturbance due to a part of the fluid flowing behind the valve body 8 occurs, the vibration of the valve body 8 Can be reliably prevented, and therefore, generation of abnormal noise can be reliably prevented.

In the center of both ends of the rod 25, mortar-shaped recesses 27, 27 are formed.
One of them accommodates a part of the valve element 8 and comes into contact with the valve element 8, so that the rod 25 is more reliably connected to the valve element 8 and the vibration of the valve element 8 is more reliably prevented. be able to.

FIG. 4 shows a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals.

The valve seat member 6 'has a small-diameter cylindrical portion 6b' coaxially and integrally connected to one end of a large-diameter cylindrical portion 6a. A valve seat is provided at the center of one end of the small-diameter cylindrical portion 6b '. A valve hole 14 'is provided coaxially in the small-diameter cylindrical portion 6b' so as to face one end opening at the center of the valve seat 7.

A rod 28 having one end abutting on the valve body 8 is slidable in the valve hole 14 'when the valve body 8 is separated from the valve seat 7 when the valve is opened, that is, when a fluid such as brake fluid flows. Mated.

The rod 28 is integrally connected to a sliding portion 28a slidably fitted in the valve hole 14 'on the side opposite to the valve body 8 of the sliding portion 28a. Frusto-conical portion 28b having a smaller diameter as it separates from sliding portion 2
8a and the inner surface of the valve hole 14 ', a sliding portion 28
A plurality of flow passages 29 are formed by providing flat surfaces at a plurality of locations on the outer surface in the circumferential direction. Rod 28
A mortar-shaped concave portion 27 that accommodates a part of the valve body 8 and can come into contact with the valve body 8 is formed at one end surface of the sliding member 28a, that is, at the center of the one end surface of the sliding portion 28a.

The valve hole 14 'is formed in a stepped manner with an annular stepped portion 30 facing the valve body 8 at an intermediate portion.
0 is a truncated cone portion 28b of the rod 28 on its inner peripheral edge.
By contacting and engaging the middle portion of the valve 28, the rod 28 is prevented from being erroneously assembled into the valve hole 14 ', and the rod 28 is connected to the valve hole 14' in a state where the filter 15 is not mounted on the valve seat member 6 '. The rod 28 functions to prevent the rod 28 from dropping from the valve hole 14 'when inserted into the valve hole 14'.

According to the second embodiment, in addition to the effects of the first embodiment, the portion where the rod 28 slides on the inner surface of the valve hole 14 'is made as short as possible, and the valve body 8 As the distance from the seat 7 increases, the cross-sectional area of the flow passage increases.
The flow resistance of the fluid flowing between the valve hole 14 'and the rod 28 can be minimized.

In order to reduce the flow resistance, the sliding portion 2
The portion having a smaller diameter than 8a is a tapered frustoconical portion 28b.
By doing so, it is possible to smoothly guide the fluid,
Fluid turbulence can be prevented.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in each of the above embodiments, the rod 25,
Although 28 is formed separately from the valve body 8, a rod may be formed integrally with the valve body.

[0035]

As described above, according to the first aspect of the present invention, it is possible to minimize the occurrence of fluid turbulence behind the valve body, and furthermore, the rod supported by the valve seat member. Thus, the vibration of the valve body can be reliably prevented by restricting the vibration of the valve body, and the generation of abnormal noise can be reliably prevented.

According to the second aspect of the present invention, the flow resistance of the fluid flowing between the valve hole and the rod can be minimized while preventing the fluid from being disturbed.

Further, according to the third aspect of the invention, the rod can be more reliably connected to the valve body, and the vibration of the valve body can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a check valve according to a first embodiment.

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

FIG. 3 is an enlarged view of a main part of FIG. 1 in a valve open state.

FIG. 4 is a sectional view corresponding to FIG. 3 in a closed state of a check valve according to a second embodiment.

[Explanation of symbols]

 5 ... valve housing 6, 6 '... valve seat member 7 ... valve seat 8 ... valve body 9 ... guide cylinder 9a ... end wall 10 ... valve spring 14, 14' ... Valve hole 20 ... Inlet passage 21 ... Outlet chamber 22 ... Outlet passage 23 ... Communication hole 25,28 ... Rod 26,29 ... Flow passage 27 ... Recess 28a ... Sliding part 28b ... Frustoconical part

Claims (3)

[Claims] A valve seat (6, 6 ') fixed to a valve housing (5) has valve holes (14, 14') communicating with an inlet passage (20) provided in the valve housing (5). A valve seat (7) with the valve holes (14, 14 ') facing the center, and a spherical valve element (8) seatable on the valve seat (7) is housed therein. A guide cylinder (9) for guiding the opening and closing operation of the body (8) is connected to the valve seat member (6, 6 '), and the valve body (8) is provided on the guide cylinder (9). )
An outlet passageway (22) provided in the valve housing (5) for accommodating a valve spring (10) biasing in a direction to be seated on the valve housing (5).
Guide tube (9) and valve housing (5)
A plurality of communication holes (23) communicating with an outlet chamber (21) formed therebetween are provided at least in a check valve provided on a side wall of the guide cylinder (9) at a portion corresponding to the valve element (8). Sometimes, rods (25, 28) having one end connected to the valve body (8) are connected to the valve holes (14, 1).
4 '), and is slidably fitted to the rod (25, 28).
At a plurality of circumferentially spaced locations on the outer surface of the rod (2).
A check valve, characterized in that a flow passage (26, 29) is formed between the outer surface of the valve hole (14, 14) and the inner surface of the valve hole (14, 14 '). 2. The rod (28) is connected to the valve hole (1).
4 ′) and slidably fit into the valve hole (1).
4 ') and a sliding portion (28a) forming the plurality of flow passages (29) between the sliding portion (28) and the valve body (8) of the sliding portion (28a). The sliding part (2
8a), the diameter of the truncated cone (28)
2. The check valve according to claim 1, further comprising: b). 3. A part of the valve body (8) is housed in at least one end center of both end faces of the rods (25, 28) separate from the valve body (8). The check valve according to claim 1 or 2, wherein a mortar-shaped recess (27) that can contact the valve body (8) is formed.