JP3577432B2 - Check valve - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a spherical valve body which is spring-biased in a direction in which the valve seat is seated on a valve seat member having a valve hole and a valve seat having the valve hole facing the center and fixed to a valve housing. And a guide tube for 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 tube and the valve housing have side walls corresponding to the valve body. The present invention relates to a check valve provided in the apparatus.
[0002]
[Prior art]
Conventionally, such a check valve is already known, for example, from Japanese Patent Application Laid-Open No. 9-20218.
[0003]
[Problems to be solved by the invention]
By the way, in a check valve in which the fluid flows through the guide cylinder so that the fluid flows through the gap between the valve element and the guide cylinder and circulates behind the valve element when the valve element is opened from the valve seat, As a result, the valve body vibrates due to the disturbance of the flow of the fluid, and an abnormal noise is generated due to the hydraulic hunting caused by the vibration of the valve body.
[0004]
Therefore, in the check valve disclosed in the above-mentioned 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 body, and fluid turbulence occurs behind the valve body. In order to prevent this, most of the fluid is prevented from flowing behind the valve body when the valve is opened, and flows from the side of the valve body to the outlet chamber side.
[0005]
However, since the flow resistance of the fluid increases only with the communication hole provided in the guide cylinder at the side of the valve body, 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.
[0006]
The present invention has been made in view of such 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]
[Means for Solving the Problems]
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 has a valve hole communicating with an inlet passage provided in the valve housing, and the valve hole faces a central portion. A valve seat is provided, 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 is housed, and a plurality of communication holes communicating with an outlet chamber formed between the guide cylinder and the valve housing through an outlet passage provided in the valve housing are provided. A check valve provided on a side wall of the guide cylinder at a portion corresponding to the valve body, wherein the valve hole is provided between the valve spring and the valve spring when the valve body is opened. rod to prevent vibration of the body is slidably fitted, of 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.
[0008]
According to such a configuration, most of the fluid flows to the outlet chamber from the plurality of communication holes provided in the portion corresponding to the valve body on the side wall of the guide cylinder when the valve body is opened from the valve seat. At the very least, turbulence 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.
[0009]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the rod is slidably fitted in the valve hole and a plurality of rods are provided between the rod and the inner surface of the valve hole. It is characterized by comprising a sliding portion forming the flow passage, and a truncated conical portion which is integrally connected to the opposite side of the sliding portion from the valve body and has a smaller diameter as the distance from the sliding portion increases. According to this configuration, the portion where the rod slides on the inner surface of the valve hole can be made as short as possible, and the flow resistance of the fluid flowing between the valve hole and the rod can be made as small as possible. Can be smoothly guided to prevent turbulence of the fluid.
[0010]
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the valve body is provided at at least one end center of both end faces of the rod which is separate from the valve body. A mortar-shaped concave portion that can accommodate a part of the valve body and that can contact the valve body is formed. According to such a configuration, the rod is more reliably connected to the valve body to further reduce the vibration of the valve body. It can be reliably prevented.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.
[0012]
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. It is a principal part enlarged view of FIG.
[0013]
First, in FIG. 1, this check valve is used, for example, in a vehicle brake device, and includes a valve housing 5, a valve seat member 6 fixed to the valve housing 5, and a valve seat 7 provided on the valve seat member 6. , A guide cylinder 9 that accommodates the valve body 8 and guides the opening and closing operation of the valve body 8, and a spring that biases the valve body 8 in the seating direction on the valve seat 7. And a valve spring 10 that exerts a force and is housed in the guide cylinder 9.
[0014]
The valve housing 5 has a small-diameter hole 11 having one end closed, a medium-diameter hole 12 formed to have a larger diameter than the small-diameter hole 11, and having one end coaxially connected to the other end of the small-diameter hole 11. A large-diameter hole 13 having a diameter larger than the diameter hole 12 and having one end coaxially connected to the other end of the medium-diameter hole 12 and the other end opened to the outer surface of the valve housing 5 is provided.
[0015]
The valve seat member 6 is configured such that a small-diameter cylindrical portion 6b is coaxially and integrally connected to one end of a large-diameter cylindrical portion 6a so that the small-diameter cylindrical portion 6b protrudes coaxially into the small-diameter hole 11. The large-diameter cylindrical portion 6a is fixed to the valve housing 5 by press-fitting it into the medium-diameter hole 12.
[0016]
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.
[0017]
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 occurrence of the rotation. 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.
[0018]
The guide cylinder 9 is formed in a cylindrical shape with an end wall 9 a at an end opposite to the valve seat member 6, and the open end of the guide cylinder 9 is connected to the small-diameter cylindrical portion 6 b of the valve seat member 6. By being caulked, it is connected to the valve seat member 6. The valve body 8 is housed in the guide tube 9, and a valve spring 10 is provided between the end wall 9 a of the guide tube 9 and the valve body 8.
[0019]
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. A plurality of communication holes 23... Are formed in a side wall of the guide cylinder 9 at a portion corresponding to the valve element 8 so as to communicate the inside of the guide cylinder 9 with the outlet chamber 21. A communication hole 24 that allows the inside to communicate with the outlet chamber 21 is provided.
[0020]
According to the present invention, the valve hole 8 of the valve seat member 6 is provided with a rod having one end in contact with the valve body 8 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. 25 are slidably fitted.
[0021]
2, the flat surface 25a, 25a,... Parallel to the axis of the rod 25 is provided at a plurality of, for example, three, circumferentially spaced locations 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,. It is formed.
[0022]
In addition, at least one end surface of the rod 25, in the center of both end surfaces in this embodiment, mortar-shaped recesses 27, 27 which can accommodate a part of the valve body 8 and come into contact with the valve body 8 are formed. That is, the rod 25 may be disposed at the valve body 8 at either end along the axial direction and fitted into the valve hole 14, and the concave portion 27 is disposed at 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.
[0023]
Next, the operation of the first embodiment will be described. As shown in FIG. 3, opening by the fluid pressure 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. In a valve-open state in which the valve-direction force 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, a portion corresponding to the valve body 8 on the side wall of the guide cylinder 9 is provided. Most of the fluid can flow through the plurality of communication holes 23 provided in the outlet chamber 21, and the amount of fluid flowing toward the communication hole 24 can be reduced, so that turbulence of the fluid behind the valve body 8 can be achieved. Can be avoided as much as possible.
[0024]
Moreover, 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. The body 8 is sandwiched 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 disturbance occurs due to a part of the fluid flowing behind the valve body 8, the vibration of the valve body 8 Can be reliably prevented, and therefore, generation of abnormal noise can be reliably prevented.
[0025]
Further, mortar-shaped recesses 27, 27 are formed in the center of both end surfaces of the rod 25, and one of the recesses 27, 27 accommodates a part of the valve body 8 and comes into contact with the valve body 8. Therefore, the rod 25 can be more reliably connected to the valve body 8 and vibration of the valve body 8 can be more reliably prevented.
[0026]
FIG. 4 shows a second embodiment of the present invention, and portions corresponding to the first embodiment are denoted by the same reference numerals.
[0027]
The valve seat member 6 'is configured such that a small-diameter cylindrical portion 6b' is coaxially and integrally connected to one end of a large-diameter cylindrical portion 6a, and a valve seat 7 is provided at the center of one end of the small-diameter cylindrical portion 6b '. In the small-diameter cylindrical portion 6b ', a valve hole 14' is provided coaxially with one end opening at the center of the valve seat 7.
[0028]
A rod 28 having one end abutting on the valve body 8 is slidably fitted into 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. You.
[0029]
The rod 28 is provided integrally with a sliding portion 28a slidably fitted in the valve hole 14 'on a side opposite to the valve body 8 of the sliding portion 28a, and is separated from the sliding portion 28a. A plurality of flat surfaces are provided between the outer surface of the sliding portion 28a and the inner surface of the valve hole 14 'at a plurality of circumferential positions on the outer surface of the sliding portion 28a. Flow passages 29 are formed. In addition, 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 rod 28, that is, at the center of one end surface of the sliding portion 28a.
[0030]
The valve hole 14 ′ is formed in a stepped manner with an annular stepped portion 30 facing the valve element 8 side at an intermediate portion, and the stepped portion 30 is formed at an inner peripheral edge of the intermediate portion between the frustoconical portion 28 b of the rod 28. By contacting and engaging the parts, erroneous assembling of the rod 28 into the valve hole 14 'is prevented, and the rod 28 is inserted into the valve hole 14' with the filter 15 not mounted on the valve seat member 6 '. The rod 28 prevents the rod 28 from dropping from the valve hole 14 '.
[0031]
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 is moved away from the valve seat 7. As the distance increases, the cross-sectional area of the flow passage increases, and the flow resistance of the fluid flowing between the valve hole 14 'and the rod 28 can be minimized.
[0032]
In addition, the portion having a smaller diameter than the sliding portion 28a is formed into a tapered frustoconical portion 28b in order to reduce the flow resistance, so that the fluid can be smoothly guided, and the fluid is prevented from being disturbed. be able to.
[0033]
As described above, the embodiments of the present invention have been described in detail. However, 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 claims. It is possible.
[0034]
For example, in each of the above embodiments, the rods 25, 28 are formed separately from the valve body 8, but the rods may be formed integrally with the valve body.
[0035]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the valve is opened and the valve is separated from the valve seat, a large amount of the communication hole formed in a portion corresponding to the valve on the side wall of the guide cylinder is used to open the outlet chamber. In a check valve that allows the fluid of the part to circulate and minimizes the occurrence of fluid turbulence behind the valve body , the valve hole has a valve body between the valve spring and the valve spring when the valve is opened. Since the rod that sandwiches and prevents the vibration of the valve body is slidably fitted, the vibration of the valve body is regulated by the rod that is slidably fitted in the valve hole, and therefore, behind the valve body. since Ru can disturbed by part of the fluid wrapping around to reliably prevent vibration of even the valve body occurs, it is possible to reliably prevent generation of abnormal noise due to vibration of the valve body. In addition, a flow passage is formed between the outer surface of the rod and the inner surface of the valve hole at a plurality of locations spaced apart in the circumferential direction of the outer surface of the rod, so that the rod is fitted into the valve hole. Even when the valve is opened, the flow of the fluid in the valve hole is allowed.
[0036]
Further, according to the second aspect of the 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.
[0037]
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 cross-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 springs 14, 14' ... Valve hole 20 ... Inlet passage 21 ... Outlet chamber 22 ... Outlet passage 23 ... Communication holes 25,28 ... Rod 26,29 ... Flow passage 27 ... Recess 28a ... Sliding part 28b ... Frustoconical part

Claims (3)

Valve holes (14, 14 ') leading to an inlet passage (20) provided in the valve housing (5) are formed in valve seat members (6, 6') fixed to the valve housing (5). 14, 14 ') facing the center, and a spherical valve element (8) that can be seated on the valve seat (7) is housed therein. A guide cylinder (9) for guiding the opening and closing operation is connected to the valve seat member (6, 6 '), and the guide cylinder (9) has a direction in which the valve element (8) is seated on the valve seat (7). And a valve spring (10) is provided between the guide cylinder (9) and the valve housing (5) through an outlet passage (22) provided in the valve housing (5). A check valve provided on a side wall of the guide cylinder (9) at a portion corresponding to the valve element (8) with a plurality of communication holes (23) communicating with the valve body (8). Oite,
In the valve holes (14, 14 '), rods (25, 24 ) for holding the valve body (8) between the valve springs (10) to prevent vibration of the valve body (8) when the valve is opened . 28) are slidably fitted to the outer surface of the rod (25, 28) and the valve holes (14, 14 ') at a plurality of locations spaced apart in the circumferential direction of the outer surface of the rod (25, 28). A check valve, characterized in that a flow passage (26, 29) is formed between inner surfaces of the first and second air passages to allow a fluid to flow therethrough. The rod (28) is slidably fitted in the valve hole (14 ') and forms a plurality of the flow passages (29) between the rod and the inner surface of the valve hole (14'). Frusto-conical portion (28b), which is integrally connected to the portion (28a) and the sliding portion (28a) on the opposite side to the valve element (8) and has a smaller diameter as the distance from the sliding portion (28a) increases. 2. The check valve according to claim 1, wherein the check valve comprises: At least one end surface of the rods (25, 28), which are separate from the valve body (8), accommodates a part of the valve body (8) at a central portion thereof. The check valve according to claim 1, wherein a mortar-shaped concave portion (27) that can contact the check valve is formed.

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