JP2007255446A - Shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components while simplifying a structure, and materialize cost reduction and weight reduction. <P>SOLUTION: This shock absorber consists of a piston 50 arranged to divide a cylinder 10 into a liquid chamber 20 side and a liquid moving chamber 30 side filled with viscous liquid Q and movable arranged, a liquid flow channel 51 provided on the piston 50 to establish communication between the liquid chamber 0 side and the liquid moving chamber 30 side, a piston rod 55 provided on the piston 50 and extending to an outside of the cylinder 10, a gas chamber 40A provided with associated with the liquid moving chamber 30 and capable of generating gas repulsion force, and a seal member 60 dividing the liquid moving chamber 30 and the gas chamber 40A and capable of moving to the gas chamber 40A side with resisting gas repulsion force according to pressure increase in the liquid moving chamber 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shock absorber.

  Various types of shock absorbers are currently in practical use. For example, as shown in FIG. 6, the shock absorber shown in Patent Document 1 moves to the liquid chamber 41 side when the operation rod 44 receives an input from a control object, and the liquid chamber 41 has an inside. The liquid passes through the liquid passage hole 45 and is press-fitted into the upper liquid chamber 41b. With this hydraulic pressure, the idle piston 46 is pushed to move in the pressure regulating chamber 42, whereby the impact on the operating rod 44 is reduced by the reaction force of the compression spring 48 acting on the idle piston 46.

  The pressure regulating chamber 42 is at atmospheric pressure, and the air tightness on the liquid chamber 41 side must be maintained with respect to the pressure regulating chamber 42. For this reason, in the shock absorber disclosed in Patent Document 1, recesses are provided on the outer peripheral surface and the inner peripheral surface of the floating piston 46, respectively, and packings 49, 50 are disposed in the respective recesses, while the upper liquid chamber 41b. The liquid pressure of the liquid that is press-fitted inside is applied to the packings 49 and 50 to improve the sealing effect.

  Therefore, the conventional structure requires the compression spring 48, the idle piston 46, and the two packings 49 and 50 for generating a reaction force, which increases the number of components and makes the structure complicated.

JP-A-1-169139

  The problem to be solved is that the number of parts is large and the structure is complicated.

  In order to simplify the structure and reduce the number of parts, the present invention provides a gas chamber or a pressure regulating chamber that is provided in association with the liquid movement chamber and can generate a reaction force, the liquid movement chamber, The main feature is that a seal member is provided which partitions the gas chamber or the pressure regulating chamber and is movable to the gas chamber or the pressure regulating chamber in accordance with an increase in the pressure of the liquid moving chamber.

  The shock absorber according to the present invention divides a gas chamber or pressure regulating chamber provided in relation to the liquid moving chamber and capable of generating a reaction force, and the liquid moving chamber and the gas chamber or pressure regulating chamber. Since the seal member that can move to the gas chamber or the pressure regulating chamber according to the pressure increase is provided, the structure can be simplified, the number of components can be reduced, and cost reduction and weight reduction can be easily realized. .

  The purpose of simplifying the structure and reducing the number of component parts has been realized by providing a seal member that can move along a piston rod in a gas chamber or a pressure regulating chamber capable of generating a reaction force.

  FIG. 1 is a shock absorber according to a first embodiment of the present invention, and FIG.

  The shock absorber E1 according to the first embodiment has a piston 50 that is movably arranged by dividing the cylinder 10 into a liquid chamber 20 side and a liquid moving chamber 30 side in which the viscous liquid Q is sealed, and the piston 50 includes the liquid. A liquid flow passage 51 provided to communicate between the chamber 20 side and the liquid movement chamber 30 side, a piston rod 55 provided in the piston 50 and extending outside the cylinder 10, and the liquid movement chamber 30. The gas chamber 40 </ b> A capable of generating a gas reaction force and the liquid movement chamber 30 and the gas chamber 40 </ b> A are partitioned, and the gas reaction chamber 40 </ b> A side against the gas reaction force according to an increase in the pressure of the liquid movement chamber 30. And a seal member 60 which can move to the right.

  More specifically, in the first embodiment, the seal member 60 is composed of a rubber-like elastic body formed in a ring shape, as shown in a front sectional cross-sectional explanatory view in FIG. It has a contact portion 61 that contacts the peripheral surface and a contact portion 62 that contacts the outer peripheral surface of the piston rod 55 on the inner peripheral side, and each of the contact portions 61, 62 is molded into a lip shape. Has been.

  Further, the seal member 60 has a groove 63 formed on the liquid chamber 20 side over the entire circumference, and when the pressure of the viscous liquid Q acts on the liquid chamber 20 side of the seal member 60, Each of the lip-shaped contact portions 61 and 62 is expanded with the concave groove 63 as a center, and the lip-shaped contact portion 61 is pressed against the inner peripheral surface of the gas chamber 40A over the entire outer periphery to provide a sealing effect. On the other hand, the lip-shaped contact portion 62 is pressed against the outer peripheral surface of the piston rod 55 over the entire inner periphery, thereby improving the sealing effect.

  Accordingly, the airtightness in the gas chamber 40A can be greatly improved, and even if the seal member 60 moves while compressing the gas in the gas chamber 40A and the internal pressure increases, the high-pressure gas is moved to the liquid movement chamber 30 side. Leakage can be reliably prevented.

  In the first embodiment, the sealing member 60 is also provided with a groove 64 on the gas chamber 40A side as shown in FIGS. 1 and 3, and the gas chamber 40A of the sealing member 60 is provided. When the gas pressure acts on the side, the groove 64 can cooperate with the groove 63 on the liquid chamber 20 side described above to improve the sealing effect.

  In the first embodiment, the sealing member 60 described above uses a rubber-like elastic body whose main component is rubber, but it is needless to say that a rubber-like elastic body whose main component is an elastic synthetic resin may be used. is there.

  In FIG. 1, reference numeral 11 denotes a spring ring, which fixes a cylinder cap 12 that seals the end of the cylinder 10 on the gas chamber 40A side. The entire outer periphery of the cylinder cap 12 and the inner peripheral surface of the gas chamber 40A, and the entire inner periphery of the cylinder cap 12 and the outer peripheral surface of the piston rod 55 are configured so as to maintain airtightness (not shown). Of course.

Since the shock absorber E1 according to the first embodiment is configured as described above,
When there is an input from the object to be controlled to the piston rod 55, a force is transmitted from the piston rod 55 to the piston 50, and the piston 50 moves to the liquid chamber 20 side. Then, the liquid Q in the liquid chamber 20 passes through the flow passage 51 and moves into the liquid moving chamber 30. At this time, the piston 50 is buffered by the resistance force that the liquid Q passes through the flow passage 51. At the same time, when the piston rod 55 enters the liquid moving chamber 30, the volume of the liquid Q presses the seal member 60.

  Further, when the piston 50 is moved in the same direction, the pressure of the viscous liquid Q that the piston rod 55 pushes off acts on the seal member 60 so that the lip-shaped contact portions 61 and 62 are centered on the concave groove 63. The lip-shaped abutting portion 61 is pressed against the inner peripheral surface of the gas chamber 40A over the entire outer periphery to improve the sealing effect, while the lip-shaped abutting portion 62 extends over the entire inner periphery. The gas in the gas chamber 40A is compressed while being pressed against the outer peripheral surface of the piston rod 55 to improve the sealing effect, and the seal member 60 moves to the cylinder cap 12 side.

  Due to the compression of the gas in the gas chamber 40A and the sliding resistance of the seal member 60 with respect to the gas chamber 40A and the piston rod 55, a drag is applied to the piston 50 to restrict its movement, and the input shock is alleviated and good. A buffering effect can be obtained.

  When there is no input from the controlled object to the piston rod 55, the piston rod 55 is pushed out of the cylinder 10 by the repulsive force of the compressed gas, and the seal member 60 moves to the liquid chamber 20 side. Thus, the liquid Q in the liquid moving chamber 30 passes through the flow passage 51 and moves to the liquid chamber 20 side, and the piston 50 easily returns to the original state.

  As described above, the shock absorber E1 according to the first embodiment is provided with the seal member 60 movably along the piston rod 55 in the gas chamber 40A, and the seal member 60 has a function of keeping the gas chamber 40A confidential. Since the structure is simplified, the structure can be simplified, the number of components can be reduced, and cost reduction and weight reduction can be easily realized.

  FIG. 2 is a shock absorber according to a second embodiment of the present invention, and FIG.

  The shock absorber E2 according to the second embodiment includes a piston 50 that is movably arranged by dividing the cylinder 10 into a liquid chamber 20 side that encloses the viscous liquid Q and a liquid moving chamber 30 side, and the liquid chamber 20 includes the piston 50. A spring 21 provided to bias the piston 50 toward the liquid movement chamber 30; a liquid flow passage 51 provided to communicate with the piston 50 between the liquid chamber 20 side and the liquid movement chamber 30 side; A valve body 52 that is slidably provided on the piston 50 and opens and closes the flow passage 51 as the piston 50 moves; a piston rod 55 that is provided on the piston 50 and extends to the outside of the cylinder 10; The pressure adjusting chamber 40B provided in relation to the liquid moving chamber 30 is partitioned from the liquid moving chamber 30 and the pressure adjusting chamber 40B, and can be moved to the pressure adjusting chamber 40B side as the pressure of the liquid moving chamber 30 increases. A sealing member 60 is configured the sealing member 60 in the pressure regulating chamber 40B from the spring 41. for biasing the liquid chamber 20 side.

In FIG. 2, reference numeral 13 denotes a spring ring, which is provided at the end of the cylinder 10 on the pressure regulating chamber 40 </ b> B side and fixes the holding member 14 that receives the spring 41. It is not always necessary to provide airtightness between the entire outer periphery of the holding member 14 and the inner peripheral surface of the pressure adjusting chamber 40 </ b> B, and between the entire inner periphery of the holding member 14 and the outer peripheral surface of the piston rod 55. This is because a drag force can be applied to the seal member 60 by the elastic force of the spring 41.
In addition, the holding member 15 that receives the seal member 60 side of the spring 41 is provided so as to be movable along the piston rod 55 as the seal member 60 moves.

  The holding member 15 may be integrated with the seal member 60 by baking or the like as shown in FIG. By integrating the seal member 60 and the holding member 15 in this manner, the number of components can be reduced, and the cost can be reduced.

  Furthermore, as shown in FIG. 5, the seal member 60, the holding member 15, the spring 41, and the holding member 14 may be integrated. By integrating in this way, the number of components can be reduced and the cost can be reduced. Further, since the spring 41 that biases the seal member 60 toward the liquid chamber 20 is provided, the airtight structure of the pressure regulating chamber 40B can be simplified.

  Therefore, the shock absorber E2 according to the second embodiment can also simplify the structure, reduce the number of components, and easily realize cost reduction and weight reduction.

Since the shock absorber E2 according to the second embodiment is configured as described above,
When there is an input from the object to be controlled to the piston rod 55, a force is transmitted from the piston rod 55 to the piston 50, and the piston 50 moves toward the liquid chamber 20 against the elastic force of the piston 50 while compressing the spring 21. To do. Then, the valve body 52 is moved by the liquid pressure to close the flow passage 51, and the liquid Q in the liquid chamber 20 moves into the liquid movement chamber 30 through the gap between the piston 50 and the inner periphery of the cylinder 10. . At this time, the piston 50 is buffered by the spring 21 and the resistance force that the liquid Q passes through the gap. At the same time, when the piston rod 55 enters the liquid moving chamber 30, the volume of the liquid Q presses the seal member 60.

  Further, when the piston 50 is moved in the same direction, the pressure of the viscous liquid Q that the piston rod 55 pushes off acts on the seal member 60 so that the lip-shaped contact portions 61 and 62 are centered on the concave groove 63. The lip-shaped contact portion 61 is expanded and pressed against the inner peripheral surface of the pressure regulating chamber 40B over the entire outer periphery to improve the sealing effect, while the lip-shaped contact portion 62 is formed on the entire inner periphery. The spring 41 provided in the pressure regulating chamber 40B is compressed while being pressed against the outer peripheral surface of the piston rod 55 to improve the sealing effect, and the seal member 60 moves to the holding member 14 side.

  The compression of the spring 41 in the pressure adjusting chamber 40B, the compression of the spring 21, and the sliding resistance against the seal member 60 and the piston rod 55 apply a drag force to the piston 50 to restrict its movement, thereby mitigating the input impact. And a good buffering effect can be obtained.

  When there is no input from the controlled object to the piston rod 55, the piston rod 55 is pushed out of the cylinder 10 by the repulsive force of the compressed spring 21, and the seal member 60 is moved to the liquid chamber 20 side by the repulsive force of the spring 41. With this moving pressure, the liquid Q in the liquid moving chamber 30 passes through the flow passage 51, opens the valve body 52 and moves to the liquid chamber 20 side, and the piston 50 easily returns to the original state. To do.

  In the case of the shock absorber E2 according to the second embodiment, the spring 21 that biases the piston 50 toward the liquid moving chamber 30 is disposed, and the valve body that opens and closes the flow passage 51 as the piston 50 moves. Since 52 is provided on the piston 50 so as to be slidable, the above-described buffering effect can be made more noticeable and quicker.

It is front view cross-section explanatory drawing which shows the shock absorber E1 which concerns on Example 1 of this invention. It is front view cross-section explanatory drawing which shows the shock absorber E2 which concerns on Example 2 of this invention. It is a section explanatory view showing the seal member which constitutes the important section of the present invention. It is a section explanatory view showing the thing which integrated the seal member and spring receiver which constitute the principal part of the present invention. It is a section explanatory view showing the thing which integrated the seal member which constitutes the principal part of the present invention, a spring receiver, a spring, and a spring receiver. It is front view sectional explanatory drawing which shows the conventional shock absorber.

Explanation of symbols

10 cylinders
DESCRIPTION OF SYMBOLS 14 Holding member 15 Holding member 20 Liquid chamber 21 Spring 30 Liquid movement chamber 40A Gas chamber 40B Pressure regulation chamber 41 Spring 50 Piston 51 Flow path 52 Valve body 55 Piston rod 60 Seal member 61 Contact part 62 Contact part 63 Groove Q Liquid E Shock absorber

Claims (6)

A piston that divides the inside of the cylinder into a liquid chamber side and a liquid movement chamber side and is arranged to be movable;
A liquid flow path provided to communicate the liquid chamber side and the liquid movement chamber side with the piston;
A piston rod provided on the piston and extending outside the cylinder;
A gas chamber provided in association with the liquid movement chamber and capable of generating a gas reaction force;
A seal member that divides the liquid movement chamber and the gas chamber and is movable toward the gas chamber against the gas reaction force according to an increase in pressure of the liquid movement chamber;
A shock absorber characterized by comprising A piston that divides the inside of the cylinder into a liquid chamber side and a liquid movement chamber side and is arranged to be movable;
A liquid flow path provided to communicate the liquid chamber side and the liquid movement chamber side with the piston;
A piston rod provided on the piston and extending outside the cylinder;
A pressure regulating chamber provided in association with the liquid moving chamber and capable of generating a reaction force;
A single seal member that divides the liquid movement chamber and the gas chamber and is movable to the pressure adjustment chamber side in accordance with an increase in the pressure of the liquid movement chamber;
A shock absorber characterized by comprising The shock absorber according to claim 1 or 2,
The seal member is formed of a rubber-like elastic body, has an abutting portion that abuts on the inner peripheral surface of the gas chamber or the pressure adjusting chamber on the outer periphery, and abuts that abuts on the outer peripheral surface of the piston rod on the inner periphery. The shock absorber is characterized in that each contact portion has a lip shape. The shock absorber according to claim 3,
The seal member forms a concave groove on the liquid transfer chamber side, and when the pressure of the liquid acts on the concave groove, each of the lip-shaped contact portions is pressed outward around the concave groove. Shock absorber characterized by that. The shock absorber according to claim 3 or 4,
A spring for urging the seal member toward the liquid movement chamber is provided in the gas chamber or the pressure regulating chamber, and a holding member for holding one end of the spring is integrally attached to the seal member. shock absorber. The shock absorber according to claim 5,
A shock absorber, wherein the holding member and the spring are integrally provided, and another holding member for the gas chamber or the pressure regulating chamber is integrally attached to the other end of the spring.

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