JP2009270597A - Damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper device having predetermined damper effects depending on the moving speed of a piston. <P>SOLUTION: The damper device 1 comprises: the piston 5 which is movable in a cylinder 3 filled with silicone oil between a pressure chamber 11 and a non-pressure chamber 13, and has a flow path 37 for communicating the pressure chamber 11 with the non-pressure chamber 13; and a control valve 39 for reducing the area of the flow path 37 depending on the moving speed of the piston 5 toward the pressure chamber 11. Herein, there are provided a relief path 43 formed passing through the piston 5 to communicate the pressure chamber 11 with the non-pressure chamber 13, and a relief valve 53 capable of opening/closing the relief path 43. The relief valve 53 operates to open the relief path 43 at least after the operation of the control valve 39, depending on the moving speed of the piston 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a damper device capable of obtaining a predetermined damper effect according to the moving speed of a piston.

  As a damper device, for example, there is one in which a piston is disposed in a cylinder via a piston rod. In such a damper device, the piston / rod moves in the axial direction in response to an external force from a door or the like, and the piston moves in the cylinder in conjunction with this movement. As a result, the damper device can exhibit a predetermined damper effect.

In this case, the piston operates normally if the moving speed of the piston is within the allowable range of the set speed.However, if the external force from the buffered object increases, the moving speed of the piston increases accordingly, exceeding the allowable range. If the speed is increased, the piston may be damaged and the predetermined damper effect may not be obtained.
JP2000-265738

  The problem to be solved is that when the moving speed of the piston exceeds the allowable range, a predetermined damper effect cannot be obtained.

  In order to obtain a predetermined damper effect even when the moving speed of the piston exceeds an allowable range, the present invention provides the piston that is movable in the cylinder filled with the working fluid to the pressure chamber side and the non-pressure chamber side. And a non-pressure chamber, and a damper device provided with an adjustment valve that reduces the area of the flow path according to the moving speed of the piston toward the pressure chamber. A relief path formed to communicate the pressure chamber and the non-pressure chamber, and a relief valve capable of opening and closing the relief path, the relief valve operating to open the relief path after the operation of the regulating valve The main feature is to do.

  According to the damper device of the present invention, even if the moving speed of the piston exceeds the allowable range, the predetermined damper effect can be reliably exhibited through the reduction of the flow path area by the adjusting valve.

  At least after the operation of the regulating valve, the relief path can be opened to allow the working fluid to escape to the non-pressure chamber side. As a result, it is possible to reliably exhibit a predetermined damper effect while suppressing damage to the piston.

  The purpose of obtaining a predetermined damper effect even when the moving speed of the piston exceeds the allowable range is realized by the relief path and the relief valve.

1 is a cross-sectional view illustrating a damper device according to a first embodiment of the present invention.
[Overall configuration of damper device]
The damper device 1 of this embodiment includes a cylinder 3 and a piston 5 as shown in FIG.

  The cylinder 3 is formed in a cylindrical shape, and a small diameter portion 7 and a large diameter portion 9 larger in diameter than the small diameter portion 7 are continuously provided in the axial direction on the inner diameter side.

  In the small diameter portion 7, for example, silicon oil is sealed as a working liquid. Inside the small diameter portion 7, the piston 5 is disposed so as to be able to reciprocate in the axial direction, and both sides in the axial direction of the piston 5 are defined as a pressure chamber 11 and a non-pressure chamber 13. A return spring 15 that urges the piston 5 toward the non-pressure chamber 13 is disposed in the small diameter portion 7. A piston rod 17 is assembled to the piston 5, and the piston rod 17 protrudes outside the cylinder 3.

  A rod guide 19 is fitted adjacent to the non-pressure chamber 13 in the large diameter portion 9 of the cylinder 3. The rod guide 19 is formed in a hollow cylindrical shape and includes an insertion hole 21 in the axial center portion. The insertion hole 21 allows the piston rod 17 to pass through the inner periphery of the rod guide 19. A circular recess 23 is formed in the outer peripheral intermediate portion of the rod guide 19. An accumulator 25 made of closed cell rubber or the like is accommodated in the recess 23.

  Flange portions 27 and 29 are formed at both ends of the rod guide 19. The flange portion 27 at one end is fitted and attached to the inner peripheral surface of the large diameter portion 9 so as to be adjacent to the non-pressure chamber 13. The one end flange portion 27 is formed with a communication passage 27 a that communicates with the non-pressure chamber 13 through the recess 23. The communication passage 27 a guides silicon oil into the recess 23 of the rod guide 19 and can absorb the volume change of the non-pressure chamber 13 caused by the accumulator 25.

The flange 29 at the other end is provided with a circumferential groove 29a, and a sealing member 31 made of U-packing or the like that is in sliding contact with the piston rod 17 is fitted and held in the circumferential groove 29a. Further, a sealing member 33 made of an O-ring or the like is held in the concave groove 29b. Adjacent to the other end flange portion 29, a cap portion 35 is attached to the inner peripheral surface of the large diameter portion 9 on the open end side to prevent the rod guide 19 from coming off.
[Specific structure of piston]
2 is an enlarged cross-sectional view showing the piston of the damper device of FIG. 1 and its peripheral structure, FIG. 3 shows the piston of FIG. 2, (a) is a cross-sectional view, and (b) is a III-III line arrow of (a). Sectional drawing in view, (c) is a plan view, and (d) is a bottom view.

  The piston 5 is formed of resin or metal as shown in FIGS. The flow path 37 is formed by a small hole 37 a formed so as to penetrate the piston 5 and a gap 37 b between the outer peripheral surface of the piston 5 and the cylinder 3. The flow path 37 is configured to move silicon oil between the pressure chamber 11 and the non-pressure chamber 13 in accordance with the movement of the piston 5. A plurality of small holes 37 a in the flow path 37 are provided in the circumferential direction of the piston 5. An adjusting valve 39 is attached to the pressure chamber 11 side of the piston 5 adjacent to the small hole 37a.

  The adjustment valve 39 is made of an elastic body such as rubber or plastic and is formed in a ring shape. The regulating valve 39 is supported by a guide bar 5a protruding from the piston 5 on the pressure chamber 11 side so as to be movable in the axial direction within a certain range. Therefore, the regulating valve 39 receives the pressure of silicon oil when the piston 5 moves to the pressure chamber 11 side and operates to close the small hole 37a of the flow path 37, and similarly, the non-pressure chamber 13 of the piston 5 is operated. It moves to the opening side with respect to the small hole 37a of the flow path 37 at the time of the movement to the side.

  The inner peripheral side of the regulating valve 39 abuts on a step portion 5b formed on the proximal end side of the guide bar 5a, and the regulating valve 39 is restricted from moving toward the closing side. Due to such regulation, a first orifice 40 is formed between the regulating valve 39 and the small hole 37a. When the moving speed of the piston 5 toward the pressure chamber 11 exceeds the first set speed, the outer peripheral portion of the regulating valve 39 is elastically deformed by the pressure of silicon oil and closes the small hole 37a. Yes. Therefore, the regulating valve 39 can close the small hole 37a in accordance with the moving speed of the piston 5 toward the pressure chamber 11 and reduce the area of the flow path 37. In the present embodiment, a second orifice 41 is provided at the end of the piston 5 on the pressure chamber 11 side so that a part of the small holes 37a can be opened in a closed state by the regulating valve 39. However, the second orifice 41 can be omitted depending on the specifications of the damper device 1.

The piston 5 includes a relief path 43 on the inner diameter side of the flow path 37 with respect to the small hole 37a. The relief path 43 is formed through the piston 5 and has a smaller diameter than the small hole 37 a of the flow path 37. The pressure chamber 11 side end of the relief path 43 reaches the guide bar 5 a of the piston 5, and the non-pressure chamber 13 side end of the relief path 43 is expanded in communication with the circumferential groove 45. A plurality of relief paths 43 are provided at predetermined intervals in the circumferential direction of the piston 5, for example, every 180 °. The relief path 43 is disposed between the valve mounting seat 47 and the valve receiving seat 49 in the radial direction.

The valve mounting seat 47 is provided on the axial center side of the piston 5. The valve mounting seat 47 is arranged to be biased to the pressure chamber 11 side with respect to the end surface 51 of the piston 5 on the non-pressure chamber 13 side. The valve seat 49 is provided around the valve mounting seat 47 and is set flush with the end surface 51 of the piston 5 on the non-pressure chamber 13 side. Therefore, the valve seat 49 protrudes from the valve mounting seat 47 to the non-pressure chamber 13 side.

  A relief valve 53 is attached to the non-pressure chamber 13 side of the piston 5 adjacent to the relief path 43.

  The relief valve 53 is made of an elastically deformable elastic body such as plastic or steel, and is formed in a ring shape. The relief valve 53 is attached to the valve mounting seat 47 of the piston 5. That is, the inner peripheral portion 53a of the relief valve 53 is nipped and fixed between the valve mounting seat 47 and the piston rod 17, and a pressing force is applied. With this pressing force, the outer peripheral portion 53b of the relief valve 53 is in close contact with the valve seat 49 in a state of being elastically deformed in advance. Therefore, the relief valve 53 closes the relief path 43 in a preloaded state by an elastic force.

  When the movement speed of the piston 5 to the pressure chamber 11 side exceeds the second set speed after the adjustment valve 39 is operated, the outer peripheral portion 53b receives the pressure of silicon oil and the relief valve 53 receives the pressure of the silicon oil. The relief pressure is set so as to be elastically deformed to open the relief path 43. Accordingly, the relief valve 53 operates to open the relief path 43 after the operation of the adjustment valve 39.

  The relief pressure can be set by adjusting one or both of the elastic deformation amount and the elastic coefficient of the relief valve 53. For example, the relief pressure is set such that the relief valve 53 opens the relief passage 43 after the regulating valve 39 completely closes the small hole 37a of the flow passage 37, or the regulating valve 39 completely opens the small hole 37a of the flow passage 37. It is possible to set so that the relief valve 53 opens the relief path 43 before it is closed.

The piston rod 17 has a stepped portion 55 a at one end 55 abutted against the relief valve 53, and one end 55 is fitted in the center hole 5 c of the piston 5. A push nut 59 as a fastener is attached to the tip 55b of the one end portion 55 of the piston rod 17 via a spring receiving portion 57 of the return spring 15 abutted against the guide bar 5a of the piston 5. Yes. In this way, the piston rod 17 is assembled to the piston 5 and applies a pressing force to the relief valve 53 attached to the valve mounting seat 47 of the piston 5. The outer peripheral side of the stepped portion 55 a of the piston rod 17 is provided with a tapered surface 55 c so that it does not interfere with the relief valve 53 during the opening operation.
[Dumping]
Hereinafter, the damping operation of the damper device 1 of the present embodiment will be described with reference to FIGS. 4 to 7 are enlarged sectional views showing the piston and its peripheral structure during the damper operation. FIG. 4 shows a case where the piston moves to the pressure chamber side at a low speed, and FIG. 6 shows a case where the piston moves to the pressure chamber side at a high speed, and FIG. 7 shows a case where the piston moves to the non-pressure chamber side. FIG. 8 is a chart showing the relationship between the moving speed of the piston and the drag during the piston operation.

  As shown in FIGS. 1 to 6, the damper device 1 according to the present embodiment is contracted into the cylinder 3 when the piston rod 17 receives an external force by a closing operation of a door as a buffer object. In conjunction with the contraction operation of the piston rod 17, the piston 5 moves in the axial direction toward the pressure chamber 11 side. When the piston 5 moves in the axial direction, the adjusting valve 39 receives pressure from the silicon oil and moves to the closing side, and performs a damping operation according to the moving speed of the piston 5.

  If the external force is relatively small and the moving speed of the piston 5 is within the allowable range of the first set speed (low speed), the damper device 1 includes the piston 5 and the cylinder 3 that are the flow paths 37 as shown in FIG. The silicon oil is moved to the non-pressure chamber 13 side through the gap 37b between the two and the small hole 37a of the flow path 37 opened by the first orifice 40.

  As a result, in the low speed region, as shown in FIG. 8, the increase of the drag according to the moving speed of the piston 5 is made gradual, and a predetermined damper effect can be reliably exhibited while suppressing the drag small (FIG. 8). 1 area).

  When the external force is relatively large and the moving speed of the piston exceeds the first set speed and is within the allowable range of the second set speed (medium speed), as shown in FIG. The outer peripheral portion 53b of 39 is elastically deformed toward the piston 5 and closes the small hole 37a of the flow path 37.

  Therefore, the damper device 1 has a non-pressure chamber through the gap 37b between the piston 5 and the cylinder 3, which is the flow path 37 having a reduced area, and the small hole 37a of the flow path 37 opened by the second orifice 41. Move silicone oil to the 13th side.

  As a result, in the middle speed range, as shown in FIG. 8, the drag increase according to the moving speed of the piston 5 can be made abrupt as compared with the low speed, and a predetermined damper effect can be surely exhibited. Yes (region 2 in FIG. 8).

  When the external force is a larger overload and the moving speed of the piston exceeds the second set speed (high speed), as shown in FIG. 6, in the damper device 1, the outer peripheral portion 53b of the relief valve 53 has a non-pressure chamber. It is elastically deformed to the 13th side and the relief path 43 is opened.

  Therefore, the damper device 1 can move the silicon oil to the non-pressure chamber 13 side through the opened relief passage 43 in addition to the passage 37 having a reduced area.

  That is, in the high speed region, the silicon oil is released from the relief path 43 to the non-pressure chamber 13 side, so that the increase in the drag according to the moving speed of the piston 5 is more moderate than that at the middle speed as shown in FIG. (Region 3 in FIG. 8).

  As a result, even when the moving speed of the piston 5 is high, damage to the piston 5 due to an excessive drag increase (internal pressure increase in the pressure chamber 11) can be suppressed and a predetermined damper effect can be reliably exhibited. .

  As described above, the damper device 1 can obtain three stages of drag-speed characteristics (drag-speed characteristics having two inflection points) against the low, medium, and high speeds of movement of the piston 5. The damper effect can be exhibited reliably.

On the other hand, when the piston rod 17 is pulled out with respect to the cylinder 3 by the opening operation of the door or the like, the silicon oil on the non-pressure chamber 13 side passes through the small hole 37a of the flow path 37 as shown in FIG. Acts on the regulating valve 39 through. As a result, the regulating valve 39 operates to the open side, and the pressure of silicon oil acting on the piston 5 can be reduced to move the piston 5 lightly.
[Effect of Example 1]
The damper device 1 of the present embodiment communicates the pressure chamber 11 and the non-pressure chamber 13 with the piston 5 that can move in the cylinder 3 filled with silicon oil to the pressure chamber 11 side and the non-pressure chamber 13 side. A flow path 37 is provided, and an adjustment valve 39 that reduces the area of the flow path 37 according to the moving speed of the piston 5 toward the pressure chamber 11 is provided.

  Therefore, in the damper device 1, even if the moving speed of the piston 5 exceeds the allowable range, the area of the flow path 37 can be reduced by the adjustment valve 39, and a predetermined damper effect can be reliably exhibited.

  The damper device 1 of the present embodiment includes a relief passage 43 that is formed through the piston 5 to communicate the pressure chamber 11 and the non-pressure chamber 13, and a relief valve 53 that can open and close the relief passage 43. 53 operates so as to open the relief path 43 after the operation of the regulating valve 39.

  Therefore, after reducing the area of the flow path 37 and exhibiting a predetermined damper effect, the relief path 43 can be opened to allow the silicon oil to escape to the non-pressure chamber 13 side. As a result, damage to the piston 5 can be suppressed, and a predetermined damper effect can be reliably exhibited.

  Moreover, with the above configuration, the number of parts can be reduced, and a relief valve function can be provided with a simple structure.

  In the damper device 1 of the present embodiment, the relief valve 53 is an elastic member that opens the relief path 43 by elastic displacement, so that the relief path 43 can be smoothly opened according to the moving speed of the piston 5. The structure can be simplified.

  Since the relief valve 53 closes the relief path 43 in a preloaded state by elastic deformation, the preload can be easily adjusted by adjusting one or both of the elastic deformation amount and the elastic coefficient. As a result, in the damper device 1, the characteristics can be easily changed according to the specifications and the like, and a predetermined damper effect can be easily and reliably exhibited.

  The damper device 1 of the present embodiment is provided with a relief path 43 between the valve mounting seat 47 and the valve receiving seat 49 protruding from the valve mounting seat 47 toward the non-pressure chamber 13, and is a piston rod that is assembled to the piston 5. The relief valve 53 is attached to the valve mounting seat 47 by applying a pressing force by 17, the outer peripheral portion 53 b of the relief valve 53 is brought into close contact with the valve seat 49, and the relief path 43 is closed by the relief valve 53.

Therefore, in the damper device 1, the elastic deformation amount of the relief valve 53 can be adjusted only by changing the protruding position of the valve seat 49 with respect to the valve mounting seat 47, and the preload can be easily adjusted.
[Others]
The present invention is not limited to the above embodiments, and various design changes are possible. For example, the relief valve 53 is formed of an elastic member and is elastically displaced by elastic deformation. For example, an elastic member is interposed between the relief valve 53 and the piston rod 17, and the elasticity of the elastic member is reduced. It is also possible that the relief valve is displaced as a whole by deformation.

  Further, although the relief valve 53 closes the relief path 43 in the preload state, the relief valve 53 may be configured to close the relief path in the non-preload state. In this case, the valve seat can be configured flush with the valve mounting seat.

  Moreover, the 1st and 2nd setting speed of the piston 5 can be arbitrarily set according to a specification etc.

It is sectional drawing which shows a damper apparatus (Example 1). FIG. 2 is an enlarged cross-sectional view showing a piston and its peripheral structure of the damper device of FIG. 1 (Example 1). 2 shows the piston of FIG. 2, in which (a) is a sectional view, (b) is a sectional view taken along line III-III in (a), (c) is a plan view, and (d) is a bottom view (Example). 1). It is an expanded sectional view which shows a piston when moving to a pressure chamber side at low speed, and its surrounding structure (Example 1). (Example 1) which is an expanded sectional view which shows a piston and its peripheral structure when moving to a pressure chamber side at medium speed. (Example 1) which is an expanded sectional view which shows the piston and its peripheral structure when moving to a pressure chamber side at high speed. (Example 1) which is an expanded sectional view which shows the piston and its peripheral structure when moving to the non-pressure chamber side. It is a graph which shows the relationship between the moving speed of a piston at the time of piston operation | movement, and a drag (Example 1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damper apparatus 3 Cylinder 5 Piston 11 Pressure chamber 13 Non-pressure chamber 17 Piston rod 37 Flow path 39 Adjustment valve 43 Relief path 47 Valve mounting seat 49 Valve seat 53 Relief valve

Claims (4)

A piston that can move between the pressure chamber side and the non-pressure chamber side in the cylinder filled with the working fluid is provided with a flow path that connects the pressure chamber and the non-pressure chamber, and the piston moves to the pressure chamber side. A damper device comprising an adjustment valve that reduces the area of the flow path according to speed,
A relief passage formed through the piston and communicating the pressure chamber and the non-pressure chamber;
A relief valve capable of opening and closing the relief path;
The relief valve operates to open the relief path after operation of the regulating valve;
A damper device characterized by that. The damper device according to claim 1,
The relief valve is an elastic member that opens the relief path by elastic displacement.
A damper device characterized by that. The damper device according to claim 2, wherein
The relief valve closes the relief path in a preloaded state by elastic deformation,
A damper device characterized by that. The damper device according to any one of claims 1 to 3,
The valve mounting seat is provided at the non-pressure chamber side end of the piston,
Around the valve mounting seat, a valve seat that protrudes from the valve mounting seat to the non-pressure chamber side and closely contacts the outer periphery of the relief valve is provided,
The relief path is provided between the valve mounting seat and the valve seat,
A pressing force is applied by a piston rod assembled to the piston to attach the relief valve to the valve mounting seat, and an outer peripheral portion of the relief valve is brought into close contact with the valve receiving seat, and the relief path is formed by the relief valve. Occluded,
A damper device characterized by that.

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