JP2009036263A - Buffer and working fluid pouring jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buffer which can exert an appropriate damping force even when a water-based fluid is selected as a working fluid. <P>SOLUTION: The buffer using the water-based fluid as the working fluid is provided with a cylinder 1, a piston 2, and a piston rod 3. The piston 2 inserted slidably to the cylinder 1 defines two pressure chambers R1, R2 in the cylinder 1, and the piston rod 3 is connected to the piston 2. Owing to a passage 4 which pours of the working fluid into the cylinder 1 and a check valve 5 which is provided at some midpoint of the passage 4, the generated damping force of the buffer can be restored to the proper level by pouring the working fluid even in a situation where working fluid gets low in the cylinder 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shock absorber and a working fluid injection jig suitable for injecting a working fluid into the shock absorber.

A conventional shock absorber includes a cylinder, a piston that is slidably inserted into the cylinder and divides the inside of the cylinder into two pressure chambers, and a piston rod that has one end connected to the piston. In addition, the vibration control target, for example, the vehicle body vibration is suppressed by being interposed between the vehicle body and the axle of the vehicle (see, for example, Patent Document 1).
JP 2002-81481 A (FIG. 1)

  On the other hand, when the working fluid is an aqueous fluid, there is the following problem if a configuration similar to that of a conventional shock absorber is employed.

  In the shock absorber, since the piston rod enters and exits the cylinder during expansion and contraction, a small amount of the working fluid adhering to the outer periphery of the piston rod as a film moves back and forth with the piston rod.

  Here, the shock absorber is a shock absorber that converts kinetic energy into heat energy and attenuates vibrations. In particular, the shock absorber is interposed between an automobile body and an axle and is expected to frequently expand and contract. In the case of a container, the temperature of the shock absorber becomes high.

  When oil is selected as the working fluid, the oil has a high boiling point and there is little concern about evaporation. However, when the water-based fluid is selected as the working fluid, the cylinder adheres to the outer periphery of the piston rod when the shock absorber becomes hot. The water-based fluid taken out will not evaporate and return to the cylinder, and there is a risk that the shock absorber will not be able to exert an appropriate damping force due to insufficient working fluid in the cylinder. .

  Therefore, the present invention was devised to improve the above-described problems, and the object of the present invention is to provide a shock absorber that exhibits an appropriate damping force even when an aqueous fluid is selected as a working fluid. It is to be.

  In order to achieve the above object, a shock absorber in the problem solving means of the present invention is connected to a cylinder, a piston slidably inserted into the cylinder and defining two pressure chambers in the cylinder, and the piston. A shock absorber comprising a piston rod and using water as a working fluid is provided with a passage capable of injecting the working fluid into the cylinder and a check valve provided in the middle of the passage.

  According to the shock absorber of the present invention, the aqueous fluid can be reinjected through the passage, so that the insufficient amount of the aqueous fluid in the cylinder is replenished, and the generated damping force of the shock absorber is restored to an appropriate level. It is possible to prevent the function of the shock absorber from being lowered. In other words, in the conventional shock absorber, the oil has a high boiling point and there is almost no fear of evaporating, and it is not expected that the oil in the cylinder will be significantly reduced even after repeated expansion and contraction. In the present invention, it is possible to re-inject the working fluid that may be insufficient in the cylinder, and it is possible to select an aqueous fluid as the working fluid. The water-based fluid is less compressible than oil and has excellent defoaming properties, so that the damping force generation responsiveness is improved and the generation of aeration can be suppressed. .

  Therefore, the shock absorber is optimal as a vehicle shock absorber that is frequently and continuously forced to extend and contract, specifically, a vehicle shock absorber interposed between the vehicle body and the axle.

  Furthermore, since the check valve is provided in the middle of the passage, the working fluid does not flow backward from the cylinder and leak when the working fluid is injected.

  The present invention will be described below based on the embodiments shown in the drawings. FIG. 1 is a longitudinal sectional view of a shock absorber according to an embodiment. FIG. 2 is a partially enlarged longitudinal sectional view of a shock absorber according to another embodiment. FIG. 3 is a cross-sectional view illustrating an example of a fluid injection jig. FIG. 4 is a cross-sectional view of another fluid injection jig.

  As shown in FIG. 1, a shock absorber D <b> 1 in one embodiment includes a cylinder 1, a piston 2 that is slidably inserted into the cylinder 1 and partitioned into two pressure chambers R <b> 1 and R <b> 2, and one end on the piston 2. Are connected to each other, a passage 4 capable of injecting a glycol aqueous solution as an aqueous fluid into the cylinder 1, and a check valve 5 provided in the middle of the passage 4.

  In the case of this shock absorber D1, the air chamber G that compensates the volume when the piston rod 3 enters and exits the cylinder 1 is inserted into the cylinder 1 by a free piston 6 slidably inserted in the cylinder 1 in FIG. The shock absorber D1 is formed as a so-called single cylinder shock absorber.

  Hereinafter, each member will be described in detail. As described above, the piston 2 divides the inside of the cylinder 1 filled with the glycol aqueous solution into two pressure chambers R1 and R2, and further, the pressure chamber R1 and the pressure are divided. It has ports 2a and 2b which communicate with the chamber R2 and whose outlet ends are opened and closed by leaf valves L1 and L2 as damping valves. When the piston 2 moves in the vertical direction in FIG. 1 with respect to the cylinder 1 and the buffer D1 expands and contracts, resistance is applied to the flow of liquid passing through the ports 2a and 2b by the leaf valves L1 and L2, thereby buffering the buffer. A damping force can be generated in D1. That is, when the buffer D1 expands and contracts, the liquid in the pressure chamber R1 and the liquid in the pressure chamber R2 come and go through the ports 2a and 2b, and is attenuated in accordance with the pressure loss caused by the leaf valves L1 and L2. It is designed to generate power.

  In this case, the damping valve provided in the ports 2a and 2b may be any valve that provides resistance to the flow of liquid when the liquid passes through the ports 2a and 2b and causes a predetermined pressure loss. In addition to L2 and L2, specifically, for example, an orifice or a poppet valve can be employed.

  In the case of this shock absorber D1, an aqueous fluid is employed as the working fluid, and the aqueous fluid is less compressible than oil, so that the responsiveness of generating damping force can be improved compared to oil. it can. In addition to water alone, the aqueous fluid is a concept including an aqueous solution in which an additive such as glycols is added to water as in the present embodiment, and the buffer D1 is made of a metal material. In that case, water added with a rust inhibitor may be used.

Furthermore, in the case of this embodiment, as described above, since the aqueous glycol solution is used as the aqueous fluid, the freezing point can be lowered as compared with water alone, so that the function as a buffer is maintained even in cold regions. In addition, a piston rod 3 is connected to one end of the piston 2, and this piston rod 3 is inserted into the inside of an annular head member 7 fitted to the upper end side of the cylinder 1 in FIG. Thus, the shock absorber D1 is interposed between the vehicle body and the axle of the vehicle via mounting brackets (not shown) provided at the upper end of the piston rod 3 and the lower end of the cylinder 1. It can be done.

  Specifically, the head member 7 holds a cylindrical bearing 9 on the inner peripheral side, and the piston rod 3 is pivotally supported by the head member 7 via the bearing 9. The piston rod 3 is provided with a hole that opens from the front end in FIG. 1 that protrudes out of the cylinder 1 and leads to a base end to which the piston 2 is assembled. A check valve 5 is provided on the way.

  Therefore, the passage 4 communicates the outside of the cylinder 1 and the pressure chamber R2, and the aqueous glycol solution that is the aqueous fluid in the present embodiment can be injected through the passage 4.

  The check valve 5 allows only the flow of fluid from the outside of the cylinder 1 to the pressure chamber R2, but prevents the reverse flow. The check valve 5 is connected to the cylinder from the pressure chamber R2 side through the passage 4. The glycol aqueous solution does not leak out of 1.

  Further, the cylinder 1 is laminated on the head member 7 and is fixed to the upper end of the cylinder 1 by caulking at the upper end thereof. The cylinder 1 is held on the inner periphery of the insert metal 8a, and the outer periphery of the piston rod 3 is held. The seal member 8 is sealed with a lip 8b that is in sliding contact with the outer periphery lip 8c that is held on the outer periphery of the insert metal 8a and is in contact with the inner periphery of the cylinder 1.

  Further, the air chamber G is over and under in the cylinder 1 because the free piston 6 moves up and down in FIG. 1 with respect to the cylinder 1 when the shock absorber D1 expands and contracts as described above, and expands and contracts its volume. The volume of the piston rod 3 entering or leaving the cylinder 1 is compensated.

  It continues and demonstrates the effect | action of the buffer D1 comprised as mentioned above. Basically, when the shock absorber D1 expands and contracts like the conventional shock absorber, the liquid in the pressure chamber R1 and the liquid in the pressure chamber R2 come and go through the ports 2a and 2b, and the pressure generated by the damping valve. A damping force commensurate with the loss is generated, and the piston rod entry volume or piston rod withdrawal volume that becomes excessive or insufficient in the cylinder 1 during the expansion and contraction is compensated by the volume change of the air chamber G described above. Will be. In this shock absorber D1, a glycol aqueous solution that is an aqueous fluid is adopted as the working fluid, and the aqueous fluid has a smaller compressibility and superior defoaming property compared to oil, so that the damping force generation response is improved. At the same time, it is possible to suppress the occurrence of aeration.

  When the shock absorber D1 reaches a high temperature, most of the glycol aqueous solution adhering to the outer periphery of the piston rod 3 protruding from the cylinder 1 is scraped off by the lip 8b of the seal member 8 during the extension. Although it remains, a slight glycol aqueous solution that has passed through the lip 8b adheres as a film to the outer periphery of the piston rod 3, and is taken out of the cylinder 1 together with the piston rod 3 to evaporate.

  The evaporation phenomenon of the aqueous glycol solution is frequently repeated by the expansion and contraction of the shock absorber D1, and when the shock absorber D1 repeatedly expands and contracts for a long period of time, the aqueous glycol solution as the working fluid tends to be insufficient in the cylinder 1. It becomes.

  However, in the case of this shock absorber D1, the working fluid can be reinjected through the passage 4, so that the shortage of working fluid in the cylinder 1 is replenished, and the generated damping force of the shock absorber D1 is set to an appropriate level. Thus, it is possible to prevent the function of the shock absorber D1 from being lowered. In other words, in the conventional shock absorber, the oil has a high boiling point and there is almost no fear of evaporating, and it is not expected that the oil in the cylinder will be significantly reduced even after repeated expansion and contraction. Although no situation is assumed, in the present invention, it is possible to reinject the working fluid that may be insufficient in the cylinder 1 and to select an aqueous fluid as the working fluid.

  That is, the shock absorber D1 is optimal as a vehicle shock absorber that is frequently and continuously forced to extend and contract, specifically, between a vehicle body and an axle.

  Further, since the check valve 5 is provided in the middle of the passage 4, the working fluid does not flow backward from the cylinder 1 and leak when the working fluid is injected. Further, since the passage 4 opens from the tip of the piston rod 3 protruding outward from the cylinder 1, the stroke length of the shock absorber D1 is not wasted, and in particular, the shock absorber D1 is between the vehicle body and the axle of the automobile. Even when the shock absorber D1 is interposed, the working fluid can be reinjected without removing the shock absorber D1 from the automobile, and the working fluid injection work of the shock absorber D1 is facilitated.

  Further, in the shock absorber, since the working fluid is a water-based fluid that is generally easily available, the working fluid can be replenished to the cylinder 1 in a timely manner.

  It continues and demonstrates the buffer D2 in other embodiment. The shock absorber D2 is different from the shock absorber D1 of the embodiment as shown in FIG. 2 in that a fitting member 10 that also functions as a seal member is provided above the head member 7 of the cylinder 1, and the fitting is performed. The member 10 is provided with a passage 11 for injecting a working fluid.

  In the following description, the configuration different from that of the embodiment will be described in detail, and the same members as those of the shock absorber D1 in the embodiment will be simply denoted by the same reference numerals and detailed description thereof will be given. It will be omitted.

  Hereinafter, the shock absorber D2 in this other embodiment will be described in detail. The fitting member 10 includes an annular main body 10a that allows the piston rod 3 to be inserted, and an axially arranged piston rod on the inner periphery of the annular main body 10a. 3 and a pair of U-packings 12 and 13 arranged with the recesses 12a and 13a facing inward of the cylinder 1, an annular groove 10b provided on the outer periphery of the annular body 10a, and a bottom of the annular groove 10b. A through hole 10c that opens and communicates between the U packings 12 and 13 on the inner periphery of the annular main body 10a.

  The fitting member 10 configured in this manner is stacked above the head member 7 in FIG. 2 and is fixed to the cylinder 1 together with the head member 7 by crimping the opening end of the cylinder 1. .

  Further, a hole 14 with a screw groove is provided on a side of the cylinder 1 facing the annular groove 10b of the fitting member 10, and a working fluid injection jig to be described later is provided in the hole 14. T can be screwed, and the working fluid can be supplied into the cylinder 1 through the hole 14, the annular groove 10b, and the through hole 10c. During the working fluid injection operation, the working fluid injection jig T is screwed into the hole 14, but is normally closed with a lid (not shown) to prevent intrusion of dust, dirt, water, and the like. Good. In addition, O-rings 15 and 16 are provided above and below the annular groove 10b of the annular main body 10a. The O-rings 15 and 16 seal between the fitting member 10 and the cylinder 1 so that the fitting member 10 is sealed. The working fluid is prevented from leaking between the cylinder 1 and the cylinder 1.

  That is, in this embodiment, the passage 11 is constituted by the hole 14, the annular groove 10b, and the through hole 10c.

  Thus, since the fitting member 10 is provided with the annular groove 10b on the outer periphery, the passage 11 can be maintained in a communicating state without positioning the fitting member 10 at a predetermined position in the circumferential direction. it can.

  In the case of this embodiment, of the U packings 12 and 13 slidably contacting the outer periphery of the piston rod 3, the U packing 12 on the lower side in FIG. 2 inside the cylinder 1 functions as a seal for sealing the inside of the cylinder 1. In addition, it also functions as a check valve that prevents the working fluid from flowing back from the cylinder 1 to the outside of the cylinder 1 when the working fluid is injected through the passage 11.

  That is, the U-packing 12 receives pressure from the cylinder 1 side by the recess 12a, presses the inner peripheral lip 12b against the piston rod 3, and the outer peripheral lip 12c in the annular seal groove 10d provided on the inner periphery of the fitting member 10. The cylinder 1 is tightly sealed by pressing, and conversely, when the pressure on the side of the passage 11 exceeds the pressure in the cylinder 1, the inner peripheral lip 12 b bends away from the piston rod 3 and is injected from the passage 11. Intrusion of fluid into the cylinder 1 is allowed.

  On the other hand, the U-packing 13 on the upper side in FIG. 2 outside the cylinder 1 receives the pressure on the passage 11 side, which becomes a high pressure, by the recess 13a when the working fluid is injected, and presses the inner peripheral lip 13b against the piston rod 3 and the outer peripheral lip. By pressing 13c to the annular seal groove 10e provided in the inner periphery of the fitting member 10, the working fluid is prevented from leaking out of the cylinder 1 when the working fluid is injected. The U packing 13 is provided with a dust lip 13d on the inner peripheral side of the upper end, and the dust lip 13d prevents dust and dirt from entering the cylinder 1.

  That is, when the working fluid is injected into the cylinder 1 through the hole 14, the annular groove 10 b and the passage 11, the U packing 12 functions as a check valve and the U packing 13 prevents pressure leakage in the passage 11. Thus, it is possible to inject the working fluid into the cylinder 1 stably and reliably.

  Accordingly, even in the shock absorber D2 in this other embodiment, the working fluid can be reinjected through the passage 11 as in the shock absorber D1 in the above-described one embodiment. It is possible to replenish the working fluid in the shortage in order to restore the generated damping force of the shock absorber D2 to an appropriate level, and to prevent the function of the shock absorber D2 from deteriorating.

  That is, even in this shock absorber D2, it is optimal as a shock absorber for a vehicle that is frequently and continuously forced to expand and contract, specifically, between a vehicle body and an axle of an automobile. It becomes.

  Further, since the fitting member 10 includes the U packing 12 that functions as a check valve and as a seal for sealing in the cylinder 1, it is not necessary to provide a separate seal member, and the stroke length of the shock absorber D2 is wasted. do not do. The fitting member 10 can also be installed inside the cylinder 1 from the head member 7. In addition, when the fitting member is provided at a position where it does not interfere with the piston rod 3, it is possible to install a member having a passage and a check valve without providing a hole allowing the insertion of the piston rod in the center. It is.

  Subsequently, in order to inject the working fluid into the buffer D2, the working fluid injection jig T described below may be used. As shown in FIG. 3, the working fluid injection jig T has a cylindrical case 21 provided with a screw portion 22 on the inner periphery, and is connected to one end of the case 21 and has a smaller diameter cylindrical shape than the case 21. The plug 20 provided with the connection portion 23 connected to the hole 14 serving as the opening of the first and second ends is screwed into the screw portion 22 provided on the inner periphery of the case 21, and the distal end is connected to the inner periphery of the connection portion 23. The plunger 24 is configured to be slidably contacted, and a seal ring 25 serving as a seal provided between the outer periphery of the plunger 24 and the inner periphery of the connection portion 23.

  More specifically, the plug 20 is provided with a screw groove on the outer periphery of the connecting portion 23 and can be screwed into the hole 14. The inner peripheral diameter of the connecting portion 23 is smaller than the inner peripheral diameter of the case 21. The outer peripheral diameter is set to be smaller than the outer peripheral diameter of the case 21. Note that the outer diameter of the connecting portion 23 is smaller than the outer diameter of the case 21 when the seal ring 26 attached to the outer periphery of the connecting portion 23 is screwed into the hole 14. This is to prevent leakage of the working fluid supplied into the passage 11 by being compressed and sandwiched between the step portion at the boundary and the side portion of the cylinder 1.

  The plunger 24 includes a flange portion 24a that can be screwed into a screw portion of the case 21, and a shaft portion 24b that rises from the flange portion 24a. A seal ring 25 is attached to the outer periphery of the shaft portion 24b.

  And the hexagon hole 24c is provided in the back part of the collar part 24a so that the front-end | tip of a hexagon wrench can be inserted, and the plunger 24 can be advanced / retracted with respect to the plug 20 using a hexagon wrench. It is like that.

  The inner peripheral diameter of the connecting portion 23 is set smaller than the inner peripheral diameter of the case 21 in order to screw the plunger 24 into the plug 20 while keeping the diameter of the hole 14 small. This is to allow the necessary hexagon wrench engagement. Therefore, if the diameter of the hole 14 can be set large, it is possible to set the inner peripheral diameter of the connecting portion 23 and the inner peripheral diameter of the case 21 to the same diameter.

  In order to inject the working fluid into the cylinder 1 with the working fluid injection jig T configured as described above, first, the annular groove 10b and the through hole 10c forming the passage 11 provided in the fitting member 10 of the shock absorber D2. Then, the connecting portion 23 is screwed into the hole 14 until the sealing ring 26 is compressed and tightly sealed by the step portion of the plug 20 and the side portion of the cylinder 1. Get in.

  After that, it is screwed into the plug 20 in advance, or the plunger 24 screwed into the plug 20 after screwing the plug 20 into the hole 14 is rotated to rotate the inside of the cylinder 1 with respect to the plug 20. The pressure inside the passage 11 is increased, and the glycol aqueous solution filled in the passage 11 is injected into the cylinder 1 through the space between the inner peripheral lip 12b of the U packing 12 and the piston rod 3. .

  If the shortage of working fluid is not solved by one injection, the operation of filling the passage 11 with a glycol aqueous solution and pushing it into the cylinder 1 with the plunger 24 is repeated. In this operation of injecting the working fluid again, the aqueous solution of glycol may be injected into the passage 11 by removing the plug 20 from the one end hole 14 or by removing only the plunger 24 from the plug 20.

  By using the working fluid injection jig T configured in this way, even in a shock absorber in which the internal pressure of the cylinder 1 is set to a high pressure, the internal pressure in the passage 11 is reduced by the feed screw mechanism of the plug 20 and the plunger 24. The working fluid can be easily raised and the working fluid can be injected into the cylinder 1 without difficulty. Then, when the operator pushes the plunger 24 into the passage 11 and increases the internal pressure of the passage 11, the operator only has to rotate the plunger 24 with respect to the plug 20, thereby reducing the work burden.

  Further, other working fluid injection jig T2 may be used for the working fluid injection operation. As shown in FIG. 4, the other working fluid injection jig T <b> 2 includes a cylindrical container 30, a cap 31 that closes the opening of the container 30, a cylindrical part 32 that communicates the inside and outside of the container 30, and a cylindrical part A cylindrical connection terminal 33 that is rotatably provided on the outer periphery of the buffer 32 and can be screwed into the hole 14 serving as the opening of the passage 11 in the shock absorber D2, and a check valve that permits only gas injection into the container 30. 34.

  More specifically, the container 30 is formed in a bottomed cylindrical shape, the upper end in FIG. 4 is thin, and a screw portion 30a is provided on the inner periphery of the upper end. The cap 31 is formed in a cylindrical shape, and is detachably attached to the container 30 by screwing a screw part 31a on the outer periphery with a screw part 30a provided on the inner periphery of the upper end in FIG.

  When the cap 31 is screwed into the container 30, the inside of the container 30 is sealed by a seal ring 36 interposed between the opening end of the cap 31 and the step 30 b provided on the inner periphery of the upper end of the container 30. It has become so.

  Further, a cylindrical portion 32 that communicates the inside and the outside of the container 30 is provided on the lower end side portion in FIG. 4 of the container 30, and a cylindrical connection terminal 33 is rotatably mounted on the outer periphery of the cylindrical portion 32. . The connection terminal 33 is provided with a screw portion 33a on the outer periphery so that the connection terminal 33 can be screwed into the hole 14. The outer diameter of the screw portion 33a is set to a small diameter like the plug 20 described above, and the seal ring 38 is formed. It is installed.

  Further, a seal ring 37 is interposed between the outer periphery of the tube portion 32 and the inner periphery of the connection terminal 33, and leakage of working fluid to be injected from between the tube portion 32 and the connection terminal 33 is prevented. It is prevented.

  Further, the top of the cap 31 is provided with a gas injection part 35 having a check valve 34 that allows only the injection of a gas as a fluid into the container 30, and gas is supplied from a gas supply source (not shown) into the container 30. Can be supplied.

  In order to inject the working fluid into the cylinder 1 with the working fluid injection jig T2 configured as described above, first, the seal ring 38 is compressed between the step portion of the connection terminal 33 and the side portion of the cylinder 1. Then, the connection terminal 33 is screwed into the hole 14 until it can be tightly sealed.

  Then, the container 30 is filled with an aqueous glycol solution, and the container 30 is sealed with the cap 31. Subsequently, gas is supplied from the gas injection unit 35 into the container 30 to maintain the pressure in the container 30 to be higher than the pressure in the cylinder 1, and the glycol aqueous solution is injected into the cylinder 1.

  In this working fluid injection jig T2, the working fluid is sufficiently stored in the container 30, and the working fluid is injected into the cylinder 1 by supplying gas into the container 30, so that the connection is performed only once. There is an advantage that the working fluid injection operation can be completed by screwing the terminal 33 into the hole 14.

  Further, in the above description, a screw groove is provided in the hole 14 so that the working fluid injection jigs T and T2 can be connected to the shock absorber D2. However, to the shock absorber D2 of the working fluid injection jigs T and T2. The connection is not limited to the structure described above. For example, although not shown, a pipe is provided on the side of the cylinder 1, and the shock absorber D2 and the working fluid injection jigs T and T2 are connected via the pipe. You may make it do.

  The working fluid injection jigs T and T2 can be used for working fluid injection work of the shock absorber D1. For example, a screw groove is formed in the inner periphery of the opening of the passage 4 at the upper end of the piston rod 3 in FIG. The working fluid injection jigs T and T2 may be connected.

  Furthermore, although the shock absorbers D1 and D2 in each embodiment are configured as single cylinder shock absorbers, an outer cylinder is provided on the outer periphery of the cylinder, and a piston rod is a cylinder between the outer cylinder and the cylinder. It goes without saying that the present invention can be embodied in a multi-cylinder shock absorber provided with a reservoir for compensating the volume when entering and exiting. Even in the multi-cylinder shock absorber, the passage may be provided in the piston rod, or the fitting member 10 having the above-described passage may be provided.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a longitudinal cross-sectional view of the shock absorber in one embodiment. It is a partially expanded longitudinal cross-sectional view of the buffer of other embodiment. It is sectional drawing which shows an example of a fluid injection jig. It is sectional drawing of another fluid injection jig.

Explanation of symbols

1 cylinder 2 piston 2a, 2b port 3 piston rod 4, 11 passage 5 check valve 6 free piston 7 head member 8 seal member 8a insert metal 8b lip 8c outer peripheral lip 9 bearing 10 fitting member 10a annular main body 10b in the fitting member Annular groove 10c in fitting member Through holes 10d, 10e in fitting member Seal grooves 12, 13 in fitting member U packing 12a, 13a Recessed portion 12b in U packing, inner peripheral lip 12c in U packing, outer circumference in U packing Dustrip 14 in lip 13d U packing 15 and 16 O-ring 20 Plug 21 Case 22 and 30a Screw part 23 Connection part 24 Plunger 24a Plunger part 24b in plunger Plunger shaft part 24c Hexagonal hole in plunger 5, 26, 36, 37, 38 Seal ring 30 Container 30b Step portion 31 Cap 32 Tube portion 33 Connection terminal 34 Check valve 35 Gas injection portion D1, D2 Buffer G Air chamber L1, L2 Leaf valve R1, R2 Pressure chamber T, T2 Working water fluid injection jig

Claims (8)

In a shock absorber comprising a cylinder, a piston slidably inserted into the cylinder and defining two pressure chambers in the cylinder, and a piston rod connected to the piston, the working fluid being an aqueous fluid. A shock absorber provided with a passage through which working fluid can be injected, and a check valve provided in the middle of the passage. The shock absorber according to claim 1, wherein the passage opens from the tip of the piston rod and communicates with the cylinder. The shock absorber according to claim 1, wherein a fitting member facing the cylinder is provided, the passage is communicated with the cylinder through the fitting member, and a check valve is provided on the fitting member. The fitting member is an annular main body that allows the piston rod to be inserted, and the inner periphery of the annular main body is slidably contacted with the outer periphery of the piston rod so that the concave portion is directed inward of the cylinder and is disposed inside the cylinder and functions as a check valve A U-packing, a U-packing which is slidably contacted with the outer periphery of the piston rod on the inner periphery of the annular body and directs the recess toward the inner side of the cylinder, and is disposed on the outer side of the cylinder; The shock absorber according to claim 3, further comprising: The shock absorber according to claim 3 or 4, wherein the fitting member includes an annular groove on an outer peripheral side, and the passage is communicated with the cylinder through the annular groove. The buffer according to any one of claims 1 to 5, wherein the aqueous fluid is a glycol aqueous solution in which glycol is added to water. A cylindrical case provided with a screw portion on the inner periphery, and connected to the opening of the passage in the shock absorber according to any one of claims 1 to 6, being connected to one end of the case and having a smaller diameter than the case. A plug provided with a connecting portion, a plunger whose base end is screwed to a screw portion provided on the inner periphery of the case and whose distal end is in sliding contact with the inner periphery of the connecting portion, an outer periphery of the plunger, and an inner periphery of the connecting portion A working fluid injection jig provided with a seal provided therebetween. The shock absorber according to any one of claims 1 to 6, wherein the shock absorber is provided on a cylindrical container, a cap that closes the opening of the container, a cylindrical part that communicates with the inside and outside of the container, and a cylindrical part that is rotatably provided on the outer periphery of the cylindrical part. A working fluid injection jig comprising a cylindrical connection terminal that can be screwed into an opening of a passage, and a check valve that allows only gas injection into the container.

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