JP3102743U - Hydraulic damping device - Google Patents

Abstract

A hydraulic pressure damping device having a simple structure is provided.
A hydraulic damping device includes a cylinder (10), a rod (20), a piston (21), a first biasing member (22), a seal (26), and a second biasing member (24). ). The rod extends movably into the cylinder. The piston is fixed to the rod, dividing the cylinder into two chambers. The piston has a number of first channels (215) and a number of second channels (216) communicating with the chamber, the first channels having a larger diameter than the second channels. The seal is movably mounted on the rod and contacts the piston to close the first channel of the piston.
[Selection diagram] Fig. 1

Description

  The present invention relates to a damping device, and more particularly to an adjustable hydraulic damping device having a simple structure.

  Hydraulic damping devices are used as shock absorbers in bicycles or as flow regulators in fluid ejection systems. Conventional hydraulic damping devices have an adjusting device for adjusting the damping effect provided thereby. However, this conventional hydraulic damping device with adjusting device has a complicated structure and its manufacturing cost is high.

  A main object of the present invention is to provide a hydraulic damping device having a simple structure.

  The hydraulic damping device has a cylinder, a rod, a piston, a first biasing member, a seal, and a second biasing member. The rod extends movably into the cylinder. The piston is fixed to the rod and divides the cylinder into two chambers. The piston has a number of first and second channels communicating with the chamber, each first channel having a diameter greater than the diameter of each second channel. The seal is movably mounted on the rod and contacts the piston to close a first channel of the piston.

  Therefore, the hydraulic pressure damping device has the ability to adjust the damping effect and has a simple structure.

  Referring to FIGS. 1 and 2, the hydraulic damping device according to the present invention includes a cylinder 10, a rod 20, a piston 21, a first biasing member 22, a seal 26, and a second biasing member 24. including. The cylinder 10 has a space 11, a top 122, and a bottom 12.

  A top cap 14 with external threads 144 is screwed into the top 122 and a bottom cap 13 with external threads 134 is screwed into the bottom 12. A central hole 132 is provided through the bottom cap 13. An annular recess 136 is provided on the inner surface defined by the central hole 132. An O-ring 138 is received in the recess 136. A working fluid is contained in the space 11 at an initial pressure.

  The rod 20 movably extends through the central hole 132 and reaches into the cylinder 10. A central hole 142 is provided through the top cap 14. An annular recess 146 is provided on the inner surface of the central hole 142. An O-ring 148 is received in the recess 146. Rod 20 extends through central hole 142 and exits through top 122. The O-rings 138, 148 can provide an excellent sealing effect to the rod 20.

  The piston 21 is fixed to the rod 20 and received in the cylinder 10 and divides the space 11 into a first chamber 112 and a second chamber 114. A central hole 211 is provided to penetrate the piston 21 for the rod 20 extending through the central hole. A threaded pin 212 is screwed into the piston 21 and has a free end that contacts the rod 20.

  The piston 21 has a number of first and second channels 215 and 216 communicating with the first chamber 112 and the second chamber 114. The first channel 215 is coaxially arranged around the central hole 211, and the second channel 216 is coaxially arranged between the periphery of the piston 21 and the first channel 215. Each first channel 215 has a diameter greater than the diameter of each second channel 216. An annular recess 213 is provided on the outer surface of the piston 21. An O-ring 214 is received in the annular recess 213.

  An annular lining 16 is installed in the cylinder 10 and contacts the O-ring 214. A feedback channel 17 is provided on the inner surface of the lining 16 and is elongated along the axis of the cylinder 10. Feedback channel 17 includes a first portion 172, a second portion 174, and a third portion 176 linearly arranged to leave top cap 14 from one end of lining 16. The width of the first portion 172 is smaller than the width of the second portion 174, and the width of the second portion 174 is smaller than the width of the third portion 176.

  A resilient first biasing member 22 is mounted about the rod 20 and is received within the first chamber 112. The two ends of the first biasing member 22 are in contact with the top cap 14 and the piston 21, respectively.

  Seal 26 is movably mounted on rod 20 and is received within second chamber 114 and abuts piston 21 to close first channel 215.

  A second resilient biasing member 24 is mounted on the rod 20 and urges the seal 26 against the piston 21. A pressing base 25 is movably mounted on the rod 20 and is in contact with the seal 26. An annular fastening base 23 is fixed to the rod 20 by a threaded pin 232. The second biasing member 24 has two ends that respectively contact the pressing base 25 and the fastening base 23. The repulsive force of the second biasing member 24 is smaller than the repulsive force of the first biasing member 22.

  The rod 20 can be connected to the bicycle wheel and the cylinder 10 can be connected to the bicycle frame so that the hydraulic damping device acts as a shock absorber for the bicycle. Referring to FIGS. 1-3, when a force is applied to the wheel and transmitted to the rod 20, the rod 20 is actuated to move. The piston 21 moves with the rod 20 so that the first chamber 112 in the cylinder 10 is reduced and the pressure in the first chamber 112 is increased. The first biasing member 22 is compressed. Since the repulsive force of the second biasing member 24 is smaller than the repulsive force of the first biasing member 22, the seal 26 is pressed away from the piston 21 by the pressure in the first chamber 112. The first channel 215 is opened, and the working fluid in the first chamber 112 flows into the second chamber 114 via the first channel 215. The pressure of the working fluid in the first chamber 112 provides a first damping effect on the impact. The first biasing member 22 can provide a second damping effect on the impact. This prevents the impact from being transmitted to the frame of the bicycle, and provides an excellent impact absorbing effect.

  The damping effect can be adjusted by means of changing the other first biasing member 22 having different repulsion. The structure of this damping device with adjustable capabilities is simple. The manufacturing cost of this damping device is low.

  When the impact is released, the piston 21 is pressed back by the repulsive force provided by the first biasing member 22. The pressure in the first chamber 112 decreases, and the working fluid returns from the second chamber 114 to the first chamber 112. When the piston 21 is in the return stroke, the seal 26 is pressed against the piston 21 to close the first channel 215. The working fluid returns to the first chamber 112 via the second channel 216. Because the diameter of the second channel 216 is significantly smaller than the diameter of the first chamber 215, the velocity of the working fluid returning to the first chamber 112 will flow into the second chamber 114 while the rod 20 is in its forward travel. Significantly lower than the speed of the working fluid. The rod 20 with the piston 21 in the return stroke decelerates, which prevents rebound.

  Referring to FIGS. 2 and 4, a feedback channel 17 in the lining 16 allows the working fluid to return to the first chamber 112 via the feedback channel 17. Because the feedback channel 17 has multiple portions 172, 174, 176 of different widths, the flow rates of the working fluid through the different portions 172, 174, 176 are different. This automatically regulates the flow rate of the working fluid back to the first chamber 112.

  Referring to FIG. 5, the rod 20 has a threaded portion 202 formed at one end remote from the cylinder 10. A nut having a ring 27 is screwed into the screw portion. A first biasing member 22A is exposed from the cylinder 10 and has two ends abutting the ring 27 and the bottom cap 13, respectively.

  Referring to FIG. 6, a top cap 14A closes the top 122 of the cylinder 10. The end of the rod 20A extending into the cylinder 10 does not extend outside from the top cap 14A, and the piston 21 is fixed to the end of the rod 20A. The first biasing member 22 is received in the first chamber 112 and has two ends that respectively contact the piston 21 and the top cap 14A. Further, the first biasing member 22 can apply a repulsive force to the rod 20A.

  Referring to FIG. 7, the first biasing member 22A is exposed from the cylinder 10 and has two ends that respectively contact the bottom cap 13 and the ring 27.

  Referring to FIG. 8, a lower holder 18 is mounted on an end of a rod 20B remote from the cylinder 10. The upper holder 19 is mounted on the top 122 of the cylinder 10. A first biasing member 22B is exposed from the cylinder 10 and has two ends that respectively contact the upper holder 19 and the lower holder 18. The lower holder 18 has a skirt 182 formed around the lower holder 18 to hold a corresponding end of the first biasing member 22B.

  A shock absorber 40 is mounted on the top cap 15 and communicates with the space 11 in the cylinder 10. The top cap 15 has a channel 152 that communicates with the space 11 in the cylinder 10. The shock absorber 40 includes a housing 42, a shock absorber piston 44, a sealing rod 46, and a spring 48. Housing 42 is attached to top cap 15 and has an interior space that communicates with channel 152. An opening 422 is provided in the housing 42 at one end remote from the top cap 15. The shock absorber piston 44 is movably mounted within the interior space of the housing 42 and divides the interior space of the housing 42 into a first chamber communicating with the channel 152 and a second chamber communicating with the opening 422. The sealing rod 46 is movably received in the channel 152 and has a sealing disk formed at one end of the sealing rod 46 to close a passage between the channel 152 and the first chamber in the housing 42. The other end of the sealing rod 46 extends outward from the top cap 15 and is connected to the handlebar via a cable. Thus, when the user pulls the handlebar, the sealing rod 46 is actuated to move within the channel 152 to open the passage between the channel 152 and the first chamber in the housing 42. As a result, the working fluid in the internal space 11 can flow into the first chamber in the housing 42 through the channel 152. A spring 48 is provided around the sealing rod 46 to provide a return force to press the sealing disc on the sealing rod 46 to close the passage between the channel 152 and the first channel of the housing 42. Is installed.

  With such a shock absorber 40, when a shock is exerted on the wheel and the rod 20B having the piston 21 is actuated to move in the space 11 toward the top cap 15, the shock absorber 40 in the space 11 of the cylinder 10 is moved. Working fluid flows into the first chamber of the housing 42. The working fluid presses the shock absorber piston 44 and moves with respect to the housing 42. When released from the impact, the working fluid returns to the space 11 in the body 10 and the shock absorber piston 44 moves in the opposite direction due to the air pressure of the environment.

  When the handlebar connected to the sealing rod 46 is released, the sealing rod 46 closes the passage between the first chamber in the housing 42 and the channel 152 by the repulsive force provided by the spring 48. Moving. Thus, the working fluid, especially oil, cannot flow into the shock absorber housing 42 such that the first chamber 112 in the body 10 is almost incompressible. As a result, the piston 21 does not move with respect to the body 10 even when an impact is applied to the rod 20B. The damping device functions as a rigid element so that its damping effect can be separated when needed by the user.

  Referring to FIG. 9, the shock absorber can be viewed as a flow regulator in a fluid ejection system. The cylinder 10 is received in a housing 31 of the liquid ejection device 30 having an inlet 32 and an outlet 36. One end of the rod 20 extends through a hole 33 in the housing 31 to the inlet 32 and a valve plate 34 mounted at the end of the rod 20 is adapted to close the hole 33. The other end of the rod 20 has a ring 27 screwed and received therein, and a first biasing member 22A is mounted between the bottom cap 13 of the cylinder 10 and the ring 27. A push button 35 is attached to the ring 27. Thus, when the user presses the push button 35, the rod 20 with the piston 21 moves with respect to the cylinder 10 and the valve plate 34 leaves the hole 33 to open the hole 33. Accordingly, fluid is discharged from the outlet 36 through the inlet 32, the hole 33, and the housing 31. Because this damping device according to the invention has a slow return stroke, the total number of hours for the valve plate 34 to move relative to the piston when the valve plate 34 closes the hole 33 is required. Therefore, a desired amount of liquid is discharged from the discharge device 30, and the damping device according to the present invention can be used to control the flow rate and discharge amount of the liquid.

FIG. 3 is an exploded perspective view of the first embodiment of the hydraulic pressure damping device according to the present invention. FIG. 2 is a partial sectional view of a first embodiment of the hydraulic pressure damping device shown in FIG. 1. FIG. 2 is a partial cross-sectional view of the hydraulic pressure damping device shown in FIG. 1 in an operation state of the first embodiment. FIG. 2 is a partial cross-sectional view of the first embodiment of the hydraulic damping device of FIG. 1 showing a lining feedback channel. FIG. 5 is a partial cross-sectional view of a second embodiment of the hydraulic damping device according to the present invention. FIG. 4 is a partial sectional view of a third embodiment of the hydraulic pressure damping device according to the present invention. FIG. 6 is a partial cross-sectional view of a fourth embodiment of the hydraulic damping device according to the present invention. FIG. 7 is a partial sectional view of a fifth embodiment of the hydraulic pressure damping device according to the present invention. FIG. 2 is a partial sectional view of a flow regulator including the first embodiment of the hydraulic pressure damping device shown in FIG. 1.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Cylinder 13, 14 Bottom cap and top cap 20 Rod 21 Piston 22, 24 First and second biasing members 26 Seal 40 Shock absorber 42 Housing 44 Shock absorber piston 46 Sealing rod 48 Spring

Claims (3)

A cylinder having an internal space, a top, a bottom, and an axial direction;
A top cap and a bottom cap attached to the top and bottom of the cylinder, respectively;
A rod movably extending through the bottom cap and reaching the interior space within the cylinder;
A piston fixed to the rod and received in the cylinder and dividing an internal space in the cylinder into a first chamber and a second chamber, the piston being provided so as to penetrate the piston, A plurality of first channels communicating with a first chamber and a second chamber, and a plurality of second channels provided through the piston and communicating with a first chamber and a second chamber in the cylinder; A piston having a diameter greater than the diameter of each second channel;
A working fluid contained in the internal space of the cylinder at an initial pressure;
A seal movably mounted on the rod, received in the second chamber and contacting the piston to close a first channel in the piston;
An elastic first biasing member connected to the rod to provide a repulsive force to the rod;
A second resilient biasing member mounted on the rod to apply a force to press the seal against the piston, the resilient force of the second biasing member being that of the first biasing member; A second biasing member that is less resilient. Further, a shock absorber mounted on the top cap and communicating with the space in the cylinder, wherein the top cap has a channel communicating with the space in the cylinder, wherein the shock absorber is attached to the top cap. A shock absorber having an interior space communicating with a channel in the top cap, and an opening provided in the housing at one end remote from the top cap;
A shock absorber piston movably mounted within the interior space of the housing and dividing the interior space of the housing into a first chamber communicating with the channel and a second chamber communicating with the opening;
A sealing rod movably received in the channel, formed at a first end of the sealing rod to close a passage between the channel and a first chamber in the housing. A sealing rod having a sealing disc, wherein a second end of the sealing rod extends outwardly from the top cap and is adapted to be connected via a cable to an actuating element on a handlebar;
A spring mounted around the sealing rod to apply a force to press a sealing disc on the sealing rod to close a passage between the channel and a first chamber in the housing. The hydraulic damping device according to claim 1, comprising: A pressing base movably mounted on the rod and in contact with the seal;
The hydraulic pressure damping device according to claim 1, wherein the second biasing member has two ends that respectively contact the pressing base and the fastening base, the fastening base being fixed to the rod.

Images