JP6335667B2 - shock absorber - Google Patents

Description

  The present invention relates to a shock absorber.

  Patent Document 1 discloses a shock absorber provided with a relief mechanism for releasing the pressure in a cylinder to the outside when a predetermined temperature is exceeded.

JP-A-5-248472

  In the above shock absorber, the relief mechanism is provided side by side in the axial direction of the cylinder with respect to the internal components housed in the cylinder. For this reason, the total length of the shock absorber is increased, and the stroke is also reduced.

  The present invention has been made in view of such technical problems, and an object of the present invention is to provide a relief mechanism without affecting the overall length and stroke of the shock absorber.

The present invention is a shock absorber, an inner tube filled with hydraulic fluid, and an outer case that is disposed so as to cover the inner tube and forms a reservoir for storing the hydraulic fluid between the inner tube and the inner tube. A piston that is slidably inserted into the inner tube and divides the inner tube into an extension side chamber and a pressure side chamber; a piston rod that is slidably inserted into the inner tube and connected to the piston; and A relief mechanism that is provided in the outer case and communicates the reservoir with the outside of the outer case, the outer case including an outer tube disposed coaxially with the inner tube, and the extension side chamber of the outer tube A cap member that closes the end on the side, and the relief mechanism includes a front Characterized in that provided in the cap member.
The present invention also provides a shock absorber, an outer tube that is filled with a working fluid, and an outer tube that covers the inner tube and forms a reservoir that stores the working fluid between the inner tube. A case, a piston that is slidably inserted into the inner tube, and divides the inner tube into an extension side chamber and a pressure side chamber; a piston rod that is slidably inserted into the inner tube and connected to the piston; A relief mechanism that is provided in the outer case and communicates the reservoir with the outside of the outer case, the outer case being arranged coaxially with the inner tube, and the outer tube A bottom member that closes the pressure side chamber end, and the relief mechanism Characterized in that provided in the bottom member.

  According to the present invention, the relief mechanism is provided in the outer case. For this reason, even if a relief mechanism is provided, the overall length of the shock absorber does not increase and the stroke does not decrease.

It is sectional drawing of the shock absorber which concerns on 1st Embodiment of this invention. It is sectional drawing of the shock absorber which concerns on 2nd Embodiment of this invention. It is a figure which shows the modification of a relief mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
The shock absorber 100 according to the first embodiment of the present invention is an apparatus that is interposed between, for example, a beam and a pillar constituting a framework of a house and generates a damping force to suppress the vibration of the house due to an earthquake. is there.

  As shown in FIG. 1, the shock absorber 100 is slidable on the inner tube 1 filled with hydraulic fluid as the hydraulic fluid, the outer case 2 disposed so as to cover the inner tube 1, and the inner tube 1. A piston 3 that is inserted and divides the inner tube 1 into an extension side chamber 110 and a pressure side chamber 120, and a piston rod 4 that is inserted into the inner tube 1 so as to be able to advance and retract and is connected to the piston 3. A reservoir 130 for storing hydraulic oil is formed between the inner tube 1 and the outer case 2.

  A rod guide 6 that slidably supports the piston rod 4 via a bush 5 is attached to the end of the inner tube 1 on the extension side chamber 110 side. A valve mechanism 7 is attached to the end of the inner tube 1 on the pressure side chamber 120 side.

  The outer case 2 includes an outer tube 8 disposed coaxially with the inner tube 1, a cap member 9 that closes an end portion of the outer tube 8 on the extension side chamber 110 side, and a bottom that closes an end portion on the compression side chamber 120 side. And a member 10. The cap member 9 and the bottom member 10 are fixed to the outer tube 8 by welding.

  The inner tube 1 is sandwiched between the cap member 9 and the bottom member 10 together with the rod guide 6 and the valve mechanism 7.

  The cap member 9 is annular and the piston rod 4 is inserted therethrough. Inside the cap member 9 is accommodated an oil seal 11 for preventing hydraulic oil from leaking from between the piston rod 4 and the cap member 9.

  A spring 12 that urges the oil seal 11 toward the cap member 9 is disposed between the oil seal 11 and the rod guide 6.

  According to this, since the oil seal 11 is compressed in the axial direction, the tightening force with which the oil seal 11 tightens the piston rod 4 can be increased.

  The rod guide 6 is provided with a through hole 6 a that communicates the space 140 between the rod guide 6 and the cap member 9 and the reservoir 130.

  The through hole 6 a is a hole for discharging the hydraulic oil flowing into the space 140 from the sliding gap between the bush 5 and the piston rod 4 by operating the shock absorber 100 to the reservoir 130.

  According to this, it can prevent that the hydraulic oil fills and the pressure in the space 140 increases. Therefore, it is possible to prevent the oil seal 11 from being compressed due to pressure, and it is possible to prevent the tightening force with which the oil seal 11 tightens the piston rod 4 from becoming excessively high.

  The cap member 9 is provided with a relief mechanism 13 that allows the inside of the outer case 2 to communicate with the outside when a set opening condition is met. The relief mechanism 13 will be described later.

  The bottom member 10 is provided with an attachment member 14 for connecting the shock absorber 100 to a bracket (not shown) provided on a beam or a column of a house. Similarly, an attachment member 15 is provided at the end of the piston rod 4 on the side extending from the outer case 2.

  The valve mechanism 7 includes passages 7 a and 7 b that communicate the pressure side chamber 120 and the reservoir 130.

  The passage 7a is provided with a check valve 16 that opens when the shock absorber 100 is extended to open the passage 7a.

  The passage 7b is provided with a damping valve 17 that opens when the shock absorber 100 is contracted to open the passage 7b and provides resistance to the flow of hydraulic fluid that passes through the passage 7b and moves from the pressure side chamber 120 to the reservoir 130. It is done.

  The piston 3 has passages 3 a and 3 b that communicate the extension side chamber 110 and the pressure side chamber 120.

  In the passage 3a, there is a damping valve 18 that opens when the shock absorber 100 is extended to open the passage 3a, and applies resistance to the flow of hydraulic oil that passes through the passage 3a and moves from the expansion side chamber 110 to the compression side chamber 120. Provided.

  In the passage 3b, there is a damping valve 19 that opens when the shock absorber 100 is contracted to open the passage 3b and provides resistance to the flow of hydraulic oil that passes through the passage 3b and moves from the compression side chamber 120 to the expansion side chamber 110. Provided.

  When the shock absorber 100 is extended so that the piston rod 4 retracts from the inner tube 1, the hydraulic oil passes through the passage 3 a from the expansion side chamber 110 whose volume is reduced by the movement of the piston 3 to the pressure side chamber 120 whose volume is increased. Move. Further, the hydraulic oil corresponding to the volume of the piston rod 4 withdrawn from the inner tube 1 passes through the passage 7 a and is supplied from the reservoir 130 to the pressure side chamber 120.

  At this time, as described above, the shock absorber 100 applies resistance to the flow of hydraulic oil passing through the passage 3a by the damping valve 18 and generates a differential pressure between the expansion side chamber 110 and the pressure side chamber 120 to generate a damping force. To do.

  When the shock absorber 100 contracts when the piston rod 4 enters the inner tube 1, the hydraulic oil passes through the passage 3 b from the compression side chamber 120 whose volume is reduced by the movement of the piston 3 to the expansion side chamber 110 where the volume is increased. Move. Further, the hydraulic oil corresponding to the volume of the piston rod 4 that has entered the inner tube 1 passes through the passage 7 b and is discharged from the pressure side chamber 120 to the reservoir 130.

  At this time, as described above, the shock absorber 100 applies resistance to the flow of the hydraulic oil passing through the passages 3b and 7b by the damping valves 19 and 17, respectively, and generates a differential pressure between the expansion side chamber 110 and the pressure side chamber 120. To generate damping force.

  Further, as described above, the hydraulic fluid is supplied from the reservoir 130 to the pressure side chamber 120 when the shock absorber 100 is extended, and the hydraulic oil is discharged from the pressure side chamber 120 to the reservoir 130 when contracted. Thereby, the volume change in the inner tube 1 is compensated.

  Next, the relief mechanism 13 will be described.

  As shown in FIG. 1, the relief mechanism 13 is opened to the resin lid member 20 fitted in the concave portion 9 a provided on the outer periphery of the cap member 9, the bottom surface of the concave portion 9 a, and the space 140. The communication path 9b provided in 9 and the retaining ring 21 which fixes the cover member 20 in the recessed part 9a are provided.

  The space 140 communicates with the reservoir 130 through the through hole 6 a of the rod guide 6. Therefore, the communication path 9b of the cap member 9 and the reservoir 130 communicate with each other through the space 140 and the through hole 6a.

  As shown in FIG. 1, in a state where the lid member 20 is fitted in the recess 9a, the lid member 20 closes the opening on the recess 9a side of the communication path 9b. That is, the relief mechanism 13 blocks the communication between the reservoir 130 and the outside of the outer case 2 by the lid member 20. An O-ring 22 is provided between the lid member 20 and the cap member 9 to prevent hydraulic oil from leaking to the outside.

  Here, the lid member 20 is formed of a resin that melts when the set opening condition is satisfied, for example, when the temperature of the lid member 20 rises to a predetermined temperature.

  Thereby, for example, when a house fire occurs, the relief mechanism 13 melts the lid member 20 at the set open temperature before the pressure in the outer case 2 exceeds the allowable pressure of the outer case 2 due to the temperature rise. The reservoir 130 communicates with the outside of the outer case 2.

  That is, the shock absorber 100 according to this embodiment includes the relief mechanism 13 so that, for example, when a house fire occurs, the pressure in the outer case 2 can be safely released.

  For example, when the pressure in the outer case 2 rises to a predetermined pressure, the lid member 20 may be formed so as to be damaged by the pressure acting from the communication path 9b. In this case, before the pressure in the outer case 2 exceeds the allowable pressure due to temperature rise, the lid member 20 can be damaged by the set opening pressure, and the reservoir 130 and the outside of the outer case 2 can be communicated with each other.

  Moreover, you may form the cover member 20 so that it may break at the set open | release pressure using the resin which fuse | melts at the set open | release temperature. In this case, the temperature condition and the pressure condition can be set as an opening condition for allowing the relief mechanism 13 to communicate between the reservoir 130 and the outside of the outer case 2, so that the reliability of the relief mechanism 13 can be improved.

  By the way, the relief mechanism 13 of this embodiment is provided in the outer peripheral side of the cap member 9 as mentioned above.

  An oil seal 11 that is one of the internal components housed in the outer case 2 is housed inside the cap member 9, and the relief mechanism 13 is disposed on the outer side of the oil seal 11 as shown in FIG. 1. The case 2 is provided side by side in the radial direction.

  According to this, the configuration of the internal parts such as the oil seal 11, the spring 12, the rod guide 6, the inner tube 1 and the valve mechanism 7 accommodated in the outer case 2 side by side in the axial direction of the outer case 2 and the components The relief mechanism 13 can be provided without affecting the shape, size, or the like. Therefore, even if the relief mechanism 13 is provided, the overall length of the shock absorber 100 is not increased and the stroke is not reduced.

  That is, by disposing the relief machine 13 so as to be aligned in the radial direction of the outer case 2 with respect to any of the internal components housed in the outer case 2, the overall length and stroke of the shock absorber 100 are not affected. A relief mechanism 13 can be provided.

  Further, the lid member 20 of the relief mechanism 13 is made of resin as described above. For this reason, for example, when the shock absorber 100 is installed sideways, the lid member 20 is not immersed in the oil by providing the relief mechanism 13 at a position higher than the oil level of the hydraulic oil stored in the reservoir 130. And the durability can be improved.

  As described above, according to the present embodiment, the relief mechanism 13 is provided in the outer case 2. For this reason, even if the relief mechanism 13 is provided, the overall length of the shock absorber 100 is not increased, and the stroke is not reduced.

  When the shock absorber 100 is installed sideways, the resin lid member 20 is not immersed in the oil by providing the relief mechanism 13 at a position higher than the oil level of the hydraulic oil stored in the reservoir 130. And the durability can be improved.

  Further, by using the resin lid member 20 for the relief mechanism 13, the temperature condition and the pressure condition can be set as an opening condition for allowing the relief mechanism 13 to communicate between the reservoir 130 and the outside of the outer case 2. Yes. Thereby, the reliability of the relief mechanism 13 can be improved.

Second Embodiment
Next, a shock absorber 200 according to a second embodiment of the present invention will be described with reference to FIG.

  The shock absorber 200 is different from the shock absorber 100 in the position of the relief mechanism. Hereinafter, description will be made centering on differences from the shock absorber 100, and the same components as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 2, the relief mechanism 23 of the present embodiment is provided on the outer peripheral side of the bottom member 10 along the radial direction of the outer case 2 with respect to the valve mechanism 7.

  The relief mechanism 23 includes a case 24 fixed to the bottom member 10, a resin lid member 20 fitted in the case 24, a communication path 25 opened to the reservoir 130 and the bottom surface of the case 24, and the lid member 20. And a retaining ring 21 for fixing the inside of the case. The communication path 25 includes a through hole 24 a provided in the case 24 and a through hole 10 a provided in the bottom member 10.

  In a state where the lid member 20 is fitted to the case 24, the lid member 20 closes the opening on the case 24 side of the communication path 25. That is, the relief mechanism 23 blocks communication between the reservoir 130 and the outside of the outer case 2 by the lid member 20. An O-ring 22 is provided between the lid member 20 and the case 24 for preventing hydraulic oil from leaking to the outside.

  According to the said structure, the effect similar to 1st Embodiment can be acquired.

  As mentioned above, although embodiment of this invention was described, the said embodiment showed only a part of application example of this invention, and is not the meaning which limits the technical scope of this invention to the specific example of said embodiment. .

  For example, in the above embodiment, the shock absorbers 100 and 200 are applied to a house, but may be applied to other buildings, vehicles such as automobiles and railways, and the like.

  Moreover, in the said embodiment, although hydraulic oil is used as a hydraulic fluid, you may use other liquids, such as water.

  Moreover, in the said embodiment, although the cover member 20 of the relief mechanism 13 is being fixed with the retaining ring 21, you may fix by caulking etc. FIG.

  In the first embodiment, the relief mechanism 13 is provided on the cap member 9, and in the second embodiment, the relief mechanism 23 is provided on the bottom member 10, but the relief mechanism is provided on the outer tube 8. Also good. Even in this case, the same effect as the above embodiment can be obtained.

  Moreover, in the said embodiment, although the relief mechanisms 13 and 23 are provided with the resin-made cover members 20, a relief mechanism is provided with the valve body 26 and the spring 27, for example, as shown in FIG. The relief valve 28 may be provided.

  Moreover, in the said embodiment, although the oil seal 11, the spring 12, the rod guide 6, the inner tube 1, and the valve mechanism 7 are provided as an internal component accommodated in the outer case 2, the structure of an internal component is this. It may be different.

  In the above embodiment, the outer case 2 includes the outer tube 8, the cap member 9, and the bottom member 10. For example, the outer side chamber 110 of the outer tube 8 does not include the cap member 9. You may make it hold | maintain an internal component in the outer case 2 by crimping the edge part of the side. Moreover, you may block | close the edge part by the side of the pressure side chamber 120 of the outer tube 8 by plastic processing, without providing the bottom member 10. FIG.

DESCRIPTION OF SYMBOLS 100 Shock absorber 110 Extension side chamber 120 Pressure side chamber 130 Reservoir 1 Inner tube 2 Outer case 3 Piston 4 Piston rod 8 Outer tube 9 Cap member 9b Communication path 10 Bottom member 13 Relief mechanism 20 Lid member 200 Shock absorber 23 Relief mechanism 28 Relief valve

Claims (6)

A shock absorber,
An inner tube filled with hydraulic fluid;
An outer case disposed over the inner tube and forming a reservoir for storing the hydraulic fluid between the inner tube;
A piston that is slidably inserted into the inner tube and divides the inner tube into an extension side chamber and a compression side chamber;
A piston rod which is inserted into the inner tube so as to freely advance and retract, and is connected to the piston;
A relief mechanism provided in the outer case and communicating the reservoir with the outside of the outer case ;
The outer case is
An outer tube disposed coaxially with the inner tube;
A cap member that closes an end of the outer tube on the extension side chamber side;
With
The relief mechanism is provided on the cap member.
Shock absorber characterized by that. The shock absorber according to claim 1,
Comprising an oil seal disposed between the piston rod and the cap member;
The shock absorber , wherein the relief mechanism is provided side by side in the radial direction of the outer case with respect to the oil seal . A shock absorber,
An inner tube filled with hydraulic fluid;
An outer case disposed over the inner tube and forming a reservoir for storing the hydraulic fluid between the inner tube;
A piston that is slidably inserted into the inner tube and divides the inner tube into an extension side chamber and a compression side chamber;
A piston rod which is inserted into the inner tube so as to freely advance and retract, and is connected to the piston;
A relief mechanism provided in the outer case and communicating the reservoir with the outside of the outer case;
The outer case is
An outer tube disposed coaxially with the inner tube;
A bottom member that closes the pressure side chamber end of the outer tube;
With
The relief mechanism is provided on the bottom member.
Shock absorber characterized by that. The shock absorber according to any one of claims 1 to 3,
The relief mechanism is provided at a position higher than the level of the hydraulic fluid stored in the reservoir when the shock absorber is installed sideways.
Shock absorber characterized by that. The shock absorber according to any one of claims 1 to 4,
The relief mechanism includes a lid member made of resin that melts or breaks when an open condition is set by closing a communication path that connects the reservoir and the outside.
Shock absorber characterized by that. The shock absorber according to any one of claims 1 to 4,
The relief mechanism is a relief valve.
Shock absorber characterized by that.

Images