JP4884790B2 - shock absorber - Google Patents

Description

  The present invention relates to a shock absorber.

  As disclosed in Patent Document 1, a conventional shock absorber is configured such that a valve plate is slidably loosely inserted into a guide bar projecting from a piston, and the pressure chamber side and non-pressure are moved by the movement of the valve plate. A liquid flow path communicating with the chamber side is opened and closed.

  However, with such a structure, it is difficult to achieve smooth and reliable operation, such as the valve plate that moves by sliding the guide bar along with the movement of the piston is inclined or caught on other components. Not only that, there were many problems such as the need to process the valve plate separately, increasing the number of parts, and complicating the structure.

JP 2000-265738 A

  The problem to be solved is that the valve portion may be tilted or caught during operation, and smooth operation cannot be expected, but the number of parts increases.

The present invention provides a cylinder that encloses a viscous liquid to form a liquid chamber, a pressure chamber side, a non-pressure chamber side, a piston disposed so as to be partitioned and moved in, the piston in the shock absorber the flow path having an openable and closable valve portion and having a flow passage of the liquid, Ru is integrally fixed to the end face of the piston said closing passage valve portion by elastic deformation to be arranged with a gap to open the flow passage through the gap the end surface side accompanying the movement of the piston to the end surface of the piston together with the cylinder The most important feature is that it is provided with an elastic membrane that is disposed in a non-pressure chamber and is elastically deformable in accordance with pressure fluctuations in the non-pressure chamber .

  The shock absorber according to the present invention is configured to open and close the flow passage that connects the pressure chamber side and the non-pressure chamber side by a valve portion that is integrally fixed to the piston that is elastically deformed as the piston moves. During operation, the valve part does not tilt or get caught by other components. Therefore, smooth and reliable operation can be achieved.

  Further, since the valve portion can be integrally formed with the piston, the structure can be simplified and the number of parts can be reduced.

  The objectives of smoothing and ensuring the operation and reducing the number of parts are realized by opening and closing the flow passage by a valve portion integrated with the piston that is elastically deformed as the piston moves.

[Shock absorber structure]
FIG. 1 is a front sectional view illustrating a shock absorber according to a first embodiment of the present invention, and FIG. 2 is a front sectional view illustrating an operating state of the same.

  As shown in FIG. 1, the shock absorber E <b> 1 according to the first embodiment includes a piston 10, a valve unit 20, and a cylinder 30.

  The cylinder 30 is formed of a drawn steel pipe or the like and encloses a viscous liquid Q such as oil to form a liquid chamber 31. The liquid chamber 31 is divided into a pressure chamber 50 side and a non-pressure chamber 60 side. The piston 10 is inserted through the piston rod 17 so as to be movable.

  The piston 10 is provided with two flow paths 11 for liquid Q penetrating the piston 10 in the axial direction, and a valve portion 20 is formed so as to open and close each flow path 11.

  In particular, in the first embodiment, the piston 10 is formed of an elastically deformable material such as synthetic resin, and the valve portion 20 is integrally formed on the end surface 12 of the piston 10, and the valve portion 20 is connected to the flow passage 11. Can be opened and closed by elastic deformation accompanying the movement of the piston 10.

  Therefore, when the piston 10 is moved to the pressure chamber 50 side, the valve portion 20 is deflected to the non-pressure chamber 60 side by the pressure of the liquid Q, and each flow passage 11 is closed to obtain a buffering effect. When the piston 10 is moved to the non-pressure chamber 60 side, the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side, and the valve unit 20 is moved to the pressure chamber 50 side by this moving pressure. The liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side, and the piston 10 can be easily returned to the original state.

  In the first embodiment, an elastic film 40 that is elastically deformed in response to pressure fluctuations in the non-pressure chamber 60 is disposed in the non-pressure chamber 60 of the cylinder 30. The elastic film 40 is made of a rubber film called a membrane, and is attached to a guide 32 inserted into the cylinder 30 as shown in the figure. Due to its elastic deformation, the non-pressure chamber 60, the pressure chamber 50, The distribution of the liquid Q between the two is improved, and the performance of the shock absorber E1 is improved.

  In the first embodiment, a vent 33 is provided in the portion of the cylinder 30 that houses the elastic film 40 as shown. Therefore, the pressure around the elastic film 40 can be increased to atmospheric pressure, and the effect of the elastic film 40 can be further promoted.

  In the figure, reference numeral 34 denotes a cap, which is provided with an insertion hole 34a for the piston rod 17 in the center, and is attached to the open end 30a of the cylinder 30 so as to close the open end 30a.

  The guide 32 is formed in a substantially inverted H shape in front sectional view, and is fitted in an accommodation step portion 30 b formed on the open end 30 a side of the cylinder 30. The piston rod 17 is slidably inserted into an insertion hole 32a provided in the axial direction at the center of the guide 32, and is further inserted into a circumferential groove 32b provided on the cap 34 side. A packing 35 is accommodated so that the liquid Q in the cylinder 30 can be prevented from leaking from the periphery of the piston rod 17 to the outside of the machine.

  The elastic film 40 is accommodated in a circumferential recess 32c formed in the axial direction at the center of the guide 32. The left and right circumferential ends 41 and 42 of the elastic film 40 are connected to the guide 32. The space 32h formed in the inner periphery of the elastic film 40 is fixed in the concave grooves 32f and 32g provided around the left and right flange portions 32d and 32e, and the communication hole formed in the right flange portion 32e. A space 32k formed between the outer circumference of the elastic membrane 40 and the inner circumference of the cylinder 30 communicates with the outside air through the vent hole 33.

[Shock absorption]
When there is an impact input from the object to be controlled to the piston rod 17, force is transmitted from the piston rod 17 to the piston 10, and the piston 10 moves to the pressure chamber 50 side.

  Then, the valve portion 20 bends to the non-pressure chamber 60 side by the pressure of the liquid Q, closes each flow passage 11, a drag is applied to the piston 10 by the dynamic pressure resistance, the movement is limited, and the input impact Is alleviated.

  When there is no input from the controlled object to the piston rod 17 and the piston 10 is moved to the non-pressure chamber 60 side, the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side. With this moving pressure, the valve unit 20 is pushed open to the pressure chamber 50 side, and the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side to easily return the piston 10 to the original state. To do.

[Effect of Example 1]
The shock absorber E1 according to the first embodiment of the present invention is movable by partitioning the liquid chamber 31 into a pressure chamber 50 side and a non-pressure chamber 60 side, in which a viscous liquid is enclosed to form the liquid chamber 31. And a piston 10 having a liquid Q flow passage 11 and a shock absorber provided with a valve portion 20 capable of opening and closing the flow passage 11. The piston 10 is integrally fixed to the end face of the piston 10. Since the valve portion 20 is configured to open and close the flow passage 11 by elastic deformation accompanying the movement of the piston 10, the valve portion 20 is inclined during operation or other components It won't get caught. Therefore, it is possible to stabilize the shock absorption characteristics of the shock absorber E1.

  Moreover, since the valve part 20 can be integrally formed with the piston main body, the number of parts can be reduced, while smoothing and ensuring the operation and simplifying the structure can be achieved.

  FIG. 3A is a front cross-sectional explanatory view showing a shock absorber E2 according to Embodiment 2 of the present invention, and FIG. 3B is a front cross-sectional enlarged explanatory view showing the main part of the same.

The main structure and effect of the shock absorber E2 according to the second embodiment are substantially the same as those of the shock absorber E1 according to the first embodiment described above. explain.
In the second embodiment, the end surface 12 of the piston 10 is formed with a recess 13 that communicates with the flow passage 11 and that can be opened and closed by the valve portion 20. The orifices 14 for setting the drag force in the closed state of the recess 13 by the valve portion 20 are provided at intervals.

  Therefore, when there is an impact input from the object to be controlled to the piston rod 17, force is transmitted from the piston rod 17 to the piston 10, and the piston 10 moves to the pressure chamber 50 side.

  Then, the valve portion 20 bends to the non-pressure chamber 60 side by the pressure of the liquid Q, closes each flow passage 11, and a drag is applied to the piston 10 by the dynamic pressure resistance to restrict its movement, while the orifice 14 However, since the liquid Q (viscous liquid) is allowed to pass while allowing the piston 10 to move while resisting, the input impact is mitigated.

  When there is no input from the controlled object to the piston rod 17 and the piston 10 is moved to the non-pressure chamber 60 side, the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side. With this moving pressure, the valve unit 20 is pushed open to the pressure chamber 50 side, and the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side to easily return the piston 10 to the original state. To do.

  In the shock absorber E2 according to the second embodiment, as described above, the orifice 14 can allow the movement while passing the liquid Q (viscous liquid) and applying a drag to the piston 10. As a result, the shock absorption characteristics of the shock absorber E2 can be stabilized.

  FIG. 4 (A) is a front cross-sectional explanatory view showing a shock absorber E3 according to Embodiment 3 of the present invention, and FIG. 4 (B) is a front cross-sectional enlarged explanatory view showing the main part of the same.

Since the main configuration and effects of the shock absorber E3 according to the third embodiment are substantially the same as the shock absorbers E1 and E2 according to the first and second embodiments, the configuration that is characteristic of the third embodiment, Only the effect produced will be described.
In the third embodiment, a small concave portion 16 is formed at an interval on the peripheral wall edge 15 side of the concave portion 13. The small concave portion 16 communicates with the pressure chamber 50, and the concave portion 13 is closed by the valve portion 20. Thus, an orifice for setting a drag force is configured with the valve portion 20.

  Therefore, in the case of the third embodiment, the small concave portion 16 constituting the orifice is formed at a distance on the peripheral wall edge 15 side of the concave portion 13, so that the slit opened on the peripheral wall edge 15 side of the concave portion 13. Thus, processing is extremely easy and further cost reduction can be achieved.

  FIG. 5 (A) is a front cross-sectional explanatory view showing a shock absorber E4 according to Embodiment 4 of the present invention, and FIG. 5 (B) is a front cross-sectional enlarged explanatory view showing the main part of the same.

The main structure and effect of the shock absorber E4 according to the fourth embodiment are substantially the same as those of the shock absorber E3 according to the third embodiment described above. explain.
In the third embodiment described above, the valve portion 20 is normally in a state in which the respective flow passages 11 are opened. In this fourth embodiment, the valve portion 20 is in a state in which the respective flow passages 11 are normally closed as illustrated. It has become.

  Therefore, if there is an impact input from the object to be controlled to the piston rod 17, force is transmitted from the piston rod 17 to the piston 10, and the piston 10 moves to the pressure chamber 50 side. 11 is closed, and as soon as the piston 10 starts to move, the orifice 16 allows the movement while passing the liquid Q (viscous liquid) and imparting a drag force to the piston 10, and the input impact. Is alleviated.

  When there is no input from the controlled object to the piston rod 17 and the piston 10 is moved to the non-pressure chamber 60 side, the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side. With this moving pressure, the valve unit 20 is pushed open to the pressure chamber 50 side, and the liquid Q in the non-pressure chamber 60 passes through the flow passage 11 and moves to the pressure chamber 50 side to easily return the piston 10 to the original state. To do.

  In the case of the fourth embodiment, since the valve portion 20 is normally in a state in which each flow passage 11 is closed, the impact can be reduced even with a slight impact input from the object to be controlled. Since the part 20 is opened, it can be returned quickly as in the other embodiments.

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 sectional explanatory drawing which shows an operation state same as the above. (A) Front view sectional explanatory drawing which shows the shock absorber E2 which concerns on Example 2 of this invention. (B) It is front view cross-section expansion explanatory drawing which shows a principal part same as the above. (A) Front view sectional explanatory drawing which shows the shock absorber E3 which concerns on Example 3 of this invention. (B) It is front view cross-section expansion explanatory drawing which shows a principal part same as the above. (A) Front view sectional explanatory drawing which shows the shock absorber E4 which concerns on Example 4 of this invention. (B) It is front view cross-section expansion explanatory drawing which shows a principal part same as the above.

Explanation of symbols

10 piston
11 Flow passage 12 End face of piston
13 Concave part 14 Orifice 15 End face of peripheral wall 16 Orifice (small concave part)
20 Valve unit 30 Cylinder 31 Liquid chamber 40 Elastic membrane 50 Pressure chamber 60 Non-pressure chamber side E Shock absorber Q Liquid

Claims (4)

A cylinder enclosing a viscous liquid to form a liquid chamber;
A piston that divides the liquid chamber into a pressure chamber side and a non-pressure chamber side and is movably disposed;
In the shock absorber having a flow passage for liquid and a valve part capable of opening and closing the flow passage,
Wherein the elastic deformation of the said end face due to the movement of the piston to open the flow passage through the gap are arranged with a gap to the end face of Rutotomoni the piston is integrally fixed to the end face of the piston and a valve portion for closing the flow passage,
A shock absorber comprising: an elastic membrane disposed in a non-pressure chamber of the cylinder and elastically deformable in accordance with pressure fluctuation in the non-pressure chamber . The shock absorber according to claim 1,
The outside air of the elastic membrane is communicated with the atmosphere.
Shock absorber characterized by that. The shock absorber according to claim 1 ,
A recess that communicates with the flow passage and is opened and closed by the valve portion is formed on an end surface of the piston, and an orifice that communicates with the pressure chamber and sets a drag force when the recess is closed by the valve portion is formed on a peripheral wall of the recess. A shock absorber characterized by being provided . The shock absorber according to claim 1,
A recess that communicates with the flow passage and is opened and closed by the valve portion is formed on an end surface of the piston, and a small recess is formed on a peripheral wall end edge side of the recess, the small recess communicates with the pressure chamber, and the valve A shock absorber comprising an orifice for setting a drag force together with the valve portion when the concave portion is closed by the portion .

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