JP2010090935A - Valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve capable of preventing the hitting noise by restricting vibration of a valve element. <P>SOLUTION: In order to prevent the hitting noise, the valve V includes the valve element 1 to be slidably inserted into a valve hole 4, which is provided in a housing 3, and an annular valve seat 2 provided on the way of a flow passage P, which is provided inside the housing 3, to open/close the flow passage P. The valve element 1 includes a valve head 5 to be seated/separated on/from the annular valve seat 2 and a barrel part 6 brought in slide-contact with an inner wall of the valve hole 4. The barrel part 6 is provided with three or more recessed parts 6c formed with an equal interval in the circumferential direction and to be blocked by the inner wall of the valve hole 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improved valve.

  This type of valve includes, for example, a valve body that is slidably inserted into a valve hole provided in the housing, and an annular valve seat that is also formed in the middle of a flow path provided in the housing. The channel is opened and closed (see, for example, Patent Document 1).

  When the valve having the above structure is used as, for example, a damping valve for a uniflow type shock absorber, it is necessary to provide resistance to the flow of fluid discharged from the cylinder to the reservoir during expansion and contraction. A rod guide that supports the piston rod is formed in the rod guide and a flow path that leads from the cylinder to the reservoir is formed, and a valve hole and an annular valve seat are formed in the rod guide so that the valve element can slide freely in the valve hole. (See, for example, Patent Document 2).

By the way, for the convenience of attaching a seal member for sealing the outer periphery of the piston rod to the rod guide, a valve hole is drilled in the radial direction from the outer periphery of the rod guide, and the tip end side of the valve hole is also drilled in the rod guide. The valve communicates with the inside of the cylinder through the port and communicates with the reservoir through a port bored in the axial direction in the rod guide on the opening end side of the valve hole. Thus, since the valve hole is also used as a part of the flow path, consideration is given to providing a notch on the outer periphery of the valve body so that the valve hole is not completely closed by the valve body.
JP 2008-51280 A JP 2002-174285 A

  When the valve is applied to a uniflow type shock absorber, it is incorporated in the shock absorber as described above, but the shock absorber is used as a component for suppressing vibration of a vibration control target such as a vehicle or a building. For this reason, the downsizing of the shock absorber is desired to be as small as possible, and the distance between the port communicating with the valve hole in the cylinder and the hole communicating with the reservoir cannot be increased. When the body is retracted from the annular valve seat, the rear end of the valve body does not block the port leading to the reservoir but may interfere with this.

  In addition, the overall length of the valve body is also shortened in order to avoid an increase in the size of the shock absorber, and it is difficult to ensure a sufficient length in the axial direction of the sliding contact portion that is in sliding contact with the inner wall of the valve hole of the valve body. It tends to occur.

  If the rear end of the valve body interferes with the port in this way, the flow of fluid that flows into the port through the valve hole is disturbed, and vibration in the radial direction of the valve body is excited, so that the valve body There was a problem that the sound hits the inner wall of the hole.

  Accordingly, the present invention was devised to improve the above-described problems, and an object of the present invention is to provide a valve that can suppress the vibration of the valve body and prevent the occurrence of a hitting sound. That is.

  In order to achieve the above object, the problem-solving means of the present invention includes a valve body that is slidably inserted into a valve hole provided in a housing, and an annular valve provided in the middle of a flow path provided in the housing. The valve having a seat and opening and closing the flow path includes a valve head on which the valve body is attached to and detached from the annular valve seat and a body portion that is in sliding contact with the inner wall of the valve hole, and the body portion has an equal interval in the circumferential direction. And three or more recesses which are closed by the inner wall of the valve hole.

  According to the valve of the present invention, since the recesses are provided on the outer periphery of the valve body at equal intervals in the circumferential direction, the valve body is pressed toward the center of the valve hole by the pressure in the recess, and the valve hole is When the valve body is eccentric with respect to the valve hole, the pressure in the recess approaching the inner wall of the valve hole is increased and the pressure in the recess moving away from the inner wall of the valve hole is decreased to reduce the pressure of the valve body. The action of suppressing eccentricity will work.

  Therefore, since the eccentricity of the valve body with respect to the valve hole is suppressed by the action of the pressure in the concave portion, the vibration in the radial direction in the valve hole of the valve body is damped so that the vibration in the radial direction of the valve body is Will be suppressed.

  Thus, since the vibration in the radial direction within the valve hole of the valve body is suppressed, the problem that the valve body collides with the inner wall of the valve hole and generates a hitting sound is solved.

  The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view of a shock absorber to which a valve according to an embodiment is applied. FIG. 2 is an enlarged vertical cross-sectional view of a valve in one embodiment. FIG. 3 is a cross-sectional view of the valve body of the valve in the embodiment.

  As shown in FIGS. 1 to 3, the valve V in one embodiment includes a valve body 1 slidably inserted into a valve hole 4 provided in a rod guide 3 as a housing, And an annular valve seat 2 provided in the middle of the flow path P provided in the structure, and is applied to a shock absorber D set to a uniflow type so as to function as a damping valve of the shock absorber D.

  On the other hand, as shown in FIG. 1, the shock absorber D includes a cylinder 10, a piston 11 that is slidably inserted into the cylinder 10, and divides the cylinder 10 into an extension side chamber R <b> 1 and a pressure side chamber R <b> 2, A piston rod 12 which is movably inserted into the piston 10 and one end of which is connected to the piston 11; an outer cylinder 13 which is disposed on the outer peripheral side of the cylinder 10 and forms a reservoir R between the cylinder 10; A rod guide 3 that closes one end of the outer cylinder 13 and pivotally supports the piston rod 12, a valve disk 14 that closes the other end of the cylinder 10, and a lid 15 that closes the other end of the outer cylinder 13. The cylinder 10 and the reservoir R are filled with, for example, hydraulic oil as a fluid, and the reservoir R is further filled with a gas such as an inert gas.

  Further, since the shock absorber D is set to a uniflow type, the piston rod 12 enters the cylinder 10 during the contraction stroke, so that the hydraulic oil corresponding to the piston rod entry volume that is excessive in the cylinder 10 is contained in the cylinder 10. Is discharged to the reservoir R through the flow path P provided in the rod guide 3, and conversely, during the extension stroke, the volume of the expansion side chamber R 1 decreases. The hydraulic oil that is discharged to the reservoir R and that is insufficient in the compression side chamber R2 due to the displacement of the piston 11 is supplied from the reservoir R, and the flow of the hydraulic oil is always in the compression side chamber R2 in both the expansion and contraction strokes. The piston 11 is provided with a pressure increasing passage 16 that allows only the flow of liquid from the pressure side chamber R2 toward the expansion side chamber R1 so as to be one-way from the pressure side chamber R1 to the expansion side chamber R1. Both supply passage 17 for allowing only flow of liquid directed from the reservoir R to the compression side chamber R2 is provided on the valve disc 14.

  The valve V applies resistance to the flow of hydraulic oil discharged from the cylinder 10 through the flow path P to the reservoir R during expansion and contraction, increases the pressure of the expansion side chamber R1 during expansion, and expands the expansion side chamber R1 and the compression side during contraction. By increasing the pressure in the chamber R2, the shock absorber D can exert a damping force.

  In addition, by setting the cross-sectional area of the piston rod 12 to one half of the cross-sectional area of the piston 11, the amount of hydraulic oil discharged to the reservoir R by both the expansion and contraction of the shock absorber D can be set to be the same. The pressure receiving area on the expansion side chamber R1 side can be set to one half of the pressure receiving area on the pressure side chamber R2, and if the piston speed is the same during expansion and contraction, the damping force generated in both expansion and contraction can be made equal.

  Hereinafter, the valve V will be described in detail. The rod guide 3 that functions as a housing is cylindrical, and closes the upper end in FIG. 1 that is one end of a cylinder 10 that is also formed in a cylindrical shape, and on the inner periphery. The outer periphery of the piston rod 12 is pivotally supported through a fitted cylindrical bearing 18.

  The rod guide 3 has an inner diameter that varies stepwise. A seal fitting portion 3a into which a seal member 19 that seals the outer circumference of the piston rod 12 is fitted, and a minimum diameter, in order from above. Small-diameter portion 3b set to, a bearing holding portion 3c set to an inner diameter larger than the small-diameter portion 3b and fitted with the bearing 18, and a flow path forming portion 3d set to a larger diameter than the bearing holding portion 3c. And a cylinder fitting portion 3e which is provided at the lowermost position in FIG. 1 and has a diameter larger than that of the flow path forming portion 3d and into which the cylinder 10 is fitted. In the case of this embodiment, in order to seal the outer periphery of the piston rod 12 more closely, an annular groove 3f is provided in the middle of the small diameter portion 3b, and the annular groove 3f is in sliding contact with the outer periphery of the piston rod 12. A seal ring 20 is attached. Further, an annular stopper 21 is attached to the inner periphery of the upper end of the seal fitting portion 3a so that the seal member 19 fitted to the seal fitting portion 3a does not fall off from the rod guide 3.

  Further, the rod guide 3 has a valve hole 4 provided in the radial direction from the outer periphery so as to function as a housing, a port 3g leading from the tip of the valve hole 4 to the inner periphery of the flow path forming portion 3d, 4, and a port 3 h that opens along the axial direction from the side of 4 and communicates with the reservoir R. A flow path P is formed by the flow path forming portion 3 d, the ports 3 g and 3 h, and the valve hole 4. An annular valve seat 2 is provided around the opening of the port 3g at the bottom.

  A pipe 22 is inserted and attached to the inner periphery of the lower end of the port 3h leading to the reservoir R. The lower end of the pipe 22 in FIG. It is considered that the hydraulic oil discharged to the reservoir R does not entrain the gas in the reservoir R.

  The rod guide 3 configured as described above is housed together with the cylinder 10 and the valve disk 14 in the outer cylinder 13 whose other end is closed by the lid 15, and is screwed into the inner periphery of the upper end in FIG. The nut 23 to be joined is fixed to the outer cylinder 13.

  The valve body 1 includes a valve head 5 that is attached to and detached from the annular valve seat 2, and a cylindrical body portion 6 that is continuous with the valve head 5, and the body portion 6 is in sliding contact with the inner wall of the valve hole 4. The valve seat 2 is movable in the axial direction.

  More specifically, the valve head 5 includes a valve head body 7 having a tapered portion 7a on the outer periphery and an annular seating portion 7b that comes into contact with the annular valve seat 2, and extends from the valve head body 7 into the port 3g. In the case of this embodiment, when the seat P is separated from the annular valve seat 2 and the flow path P is opened, the retraction amount of the valve body 1 from the annular valve seat 2 increases. The area of the gap between the needle 8 and the inner edge of the annular valve seat 2 is gradually increased, and the damping characteristic of the shock absorber D is a characteristic that the damping force increases in proportion to the increase of the piston speed. It is set to be.

  The damping characteristic of the shock absorber D can be arbitrarily set by changing the increasing rate of the gap between the needle 8 and the inner edge of the annular valve seat 2 with respect to the increase in the retraction amount of the valve body 1 from the annular valve seat 2. Can be changed.

  The body 6 is provided with four notches 6a that allow the passage of hydraulic oil between the outer periphery and the inner wall of the valve hole 4 having a circular cross section at equal intervals in the circumferential direction on the outer periphery, and slides between the notches 6a. The contact portion 6b is in sliding contact with the inner wall of the valve hole 4. Accordingly, the valve body 1 does not block the flow path P by the body portion 6, and the hydraulic oil discharged from the cylinder 10 passes between the valve body 1 and the valve hole 4 through the notch 6 a. It can be moved to the reservoir R.

  Furthermore, the trunk | drum 6 is provided with the four recessed parts 6c formed in the circumferential direction of the trunk | drum 6 at equal intervals in each of the sliding contact parts 6b. Each concave portion 6c is set to have the same depth and shape. In this case, the concave portion 6c has a long groove shape whose longitudinal direction coincides with the axial direction of the valve body 1, and the left and right ends of each concave portion 6c in FIG. It arrange | positions on the periphery and will be obstruct | occluded by the inner wall of the said valve hole 4 when the sliding contact part 6b is slidably contacted with the inner wall of the valve hole 4. FIG. In addition, providing the recessed part 6c in the trunk | drum 6 at equal intervals is arrange | positioning in the circumferential direction so that the distance between the circumferential direction centers of each recessed part 6c may become equal.

  A spring 9 for energizing the valve body 1 toward the annular valve seat 2 is accommodated in the body portion 6. Specifically, the spring 9 is interposed between the spring receiver 24 that closes the opening end of the valve hole 4 and the back surface of the valve head 5 of the valve body 1 in a compressed state. The generated urging force is applied to the valve body 1 so that the valve body 1 is not separated from the annular valve seat 2 until the pressure in the cylinder 10 reaches the valve opening pressure.

  That is, when the shock absorber D expands and contracts, the valve V separates the valve body 1 from the annular valve seat 2 due to the pressure increase in the cylinder 10 to open the flow path P, and discharges from the cylinder 10 to the reservoir R. The damping force is generated in the shock absorber D by applying resistance to the flow of the hydraulic oil.

  In the valve V, the concave portion 6c is provided on the outer periphery of the valve body 1 as described above. The concave portion 6c has a sliding portion between the sliding contact portion 6b of the body portion 6 and the valve hole 4. The hydraulic oil enters through the moving gap, and the inside of the concave portion 6c is accumulated.

  And since the recessed part 6c is provided in the outer periphery of the valve body 1 at equal intervals in the circumferential direction, the valve body 1 is pressed toward the center of the valve hole 4 by the pressure in the recessed part 6c, and the valve hole 4 On the other hand, when the valve body 1 is eccentric with respect to the valve hole 4, the pressure in the recess 6 c approaching the inner wall of the valve hole 4 increases and the pressure in the recess 6 c moving away from the inner wall of the valve hole 4 is increased. The effect | action which falls and suppresses the eccentricity of the valve body 1 works.

  Therefore, the valve body 1 moves backward from the annular valve seat 2 and the left end in FIG. 2 of the trunk portion 6 which becomes the rear end of the valve body 1 interferes with the opening of the port 3h, and the hydraulic oil passing through the flow path P Even if the flow may be disturbed, the eccentricity of the valve body 1 with respect to the valve hole 4 is suppressed by the action of the pressure in the recess 6c. Is damped, and vibration in the radial direction of the valve body 1 is suppressed.

  Thus, since the vibration in the radial direction in the valve hole 4 of the valve body 1 is suppressed, the problem that the valve body 1 collides with the inner wall of the valve hole 4 and generates a hitting sound is solved.

  Furthermore, even when the axial length of the sliding contact portion 6b of the valve body 1 cannot be sufficiently secured, the valve hole of the valve body 1 is prevented by the eccentricity suppressing action in the valve hole 4 of the valve body 1. Since rattling can be suppressed within 4, the valve V can be further downsized in the axial direction.

  Note that three or more notches 6a are provided for the convenience of providing three or more sliding contact portions 6b provided between the notches 6a at equal intervals in the circumferential direction so as to suppress the radial play of the valve body 1. However, if there is no worries about rattling, the notches 6a need not be provided at equal intervals in the circumferential direction. Further, without providing the notch 6 a on the outer periphery of the body portion 6, a communication hole may be provided from the tapered portion of the valve head 5 to the back surface of the valve head 5 to ensure communication between the cylinder 10 and the reservoir R. In that case, the outer periphery of the body portion 6 can be slidably contacted with the inner wall of the valve hole 4 over the entire periphery, and three or more recesses 6c can be provided on the outer periphery of the body portion 6 at equal intervals. Good.

  Furthermore, in the case of this embodiment, it is necessary to provide the recess 6c in the sliding contact portion 6b in order to form a state in which the recess 6c is closed by the inner wall of the valve hole 4. If three or more are provided at equal intervals, the eccentricity of the valve body 1 with respect to the valve hole 4 can be suppressed. Therefore, it is necessary to make the number of the recessed portions 6c equal to the number of the sliding contact portions 6b. There is no. Therefore, for example, if six sliding contact portions 6b are provided at equal intervals in the circumferential direction, every other concave portion 6c may be provided in the circumferential direction of the sliding contact portions 6b. Further, the position of the recess 6c with respect to the sliding contact portion 6b is not necessarily provided at the center in the circumferential direction of the sliding contact portion 6b. There is an advantage that the contact portion 6b can be brought into sliding contact with the inner wall of the valve hole 4.

  Furthermore, in the case of this embodiment, the axial installation positions of the respective recesses 6c with respect to the valve body 1 are matched, that is, the left and right ends in FIG. 2 are arranged on the same circumference. However, it is considered that the moment in the clockwise or counterclockwise direction does not occur with respect to the paper surface in FIG. 2 of the valve body 1 due to the pressure in the recess 6c. Even if the installation position in the axial direction of 6c varies, the above-described effects are not lost.

  Further, the shape of the recess 6c is arbitrary, and is not limited to the above-described position, and a plurality of the recesses 6c may be provided in the axial direction. The valve body 1 is viewed from the valve head 5 side, that is, FIG. When the intermediate valve body 1 is viewed from the right, and the installation positions in the circumferential direction of the recesses 6c are projected, these recesses 6c may be installed at equal intervals in the circumferential direction.

  As described above, the valve V is optimal for a valve having a configuration in which the port 3h communicating with the valve hole 4 interferes with the retraction of the valve body 1 from the annular valve seat 2, but the valve body 1 Since the vibration in the valve hole 4 is suppressed by the pressure in the recess 6c provided in the valve body, the vibration of the valve element 1 can be suppressed even when applied to a valve having another structure, not limited to the valve having the above structure. It is clear that the occurrence of the occurrence can be prevented.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a longitudinal cross-sectional view of the buffer which applied the valve | bulb of one Embodiment. It is an expansion longitudinal cross-sectional view of the valve | bulb in one Embodiment. It is a cross-sectional view of the valve body of the valve in one embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body 2 Annular valve seat 3 Rod guide 3a as housing Seal fitting part 3b in rod guide Small diameter part 3c in rod guide Bearing holding part 3d in rod guide Flow path forming part 3e in rod guide Cylinder fitting part in rod guide 3f Annular grooves 3g and 3h in the rod guide Port 4 in the rod guide 5 Valve hole 5 Valve head 6 Body 6a Body 6a Notch 6b in the body Slide portion 6c in the body 7 Concave in the body 7 Main body 7a in the valve head Taper in the valve head body Part 7b Seating part 8 on valve body 9 Needle 9 on valve head Spring 10 Cylinder 11 Piston 12 Piston rod 13 Outer cylinder 14 Valve disk 15 Lid 16 Pressure increasing passage 17 Supply passage 18 Bearing 19 Sealing member 20 Seal ring 21 Stopper 22 Pipe 23 Na Preparative D buffer P passage R reservoir R1 expansion side chamber R2 compression side chamber V valve

Claims (3)

In a valve that opens and closes a flow path with a valve body that is slidably inserted into a valve hole provided in the housing and an annular valve seat that is also provided in the middle of the flow path provided in the housing, Three or more valve heads that are attached to and detached from the annular valve seat, and a body portion that is slidably in contact with the inner wall of the valve hole, are formed at equal intervals in the circumferential direction on the body portion and are blocked by the inner wall of the valve hole A valve characterized by providing a recess. The valve according to claim 1, wherein an axial installation position of each concave portion with respect to a valve body is matched. The body is provided with a notch that is provided at equal intervals in the circumferential direction to form a gap with the inner wall of the valve hole, and the recess is provided in a sliding contact portion that is in sliding contact with the inner wall of the valve hole between the notches. The valve according to claim 1.

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