JP2008128427A - Shock absorber with vehicle height control function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorber with a vehicle height control function for accurately keeping a vehicle height as predetermined. <P>SOLUTION: The shock absorber with the vehicle height control function comprises a shock absorber body D having a cylinder 2 and a piston 3 for partitioning the cylinder 2 into a compression side chamber R1 and an elongation side chamber R2, a pump chamber P to be expanded/contracted with the expansion/contraction of the shock absorber body D, a jack chamber J opposed to a suspension spring support 4 movably mounted on the outer periphery of the cylinder 2, a suction passage 5 for communicating the pump chamber P with the elongation side chamber R2 to allow a flow only from the elongation side chamber R2 to the pump chamber P, a supply passage 6 for communicating the pump chamber P with the jack chamber J, and a vehicle height control port 7 for communicating the midway of the supply passage 6 with the compression side chamber R1. The shock absorber body D has a container 13 outside the cylinder 2 and a reservoir chamber R3 in the container 13, communicated with the inside of the cylinder 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of a shock absorber with a vehicle height adjusting function.

  As this type of vehicle height adjustment shock absorber, for example, a cylinder, a piston that divides the inside of the cylinder into a pressure side chamber and an extension side chamber, a hollow piston rod that is connected to the piston on the distal end side, and a base end that is connected to the cylinder Provided between the pump rod connected and slidably inserted into the piston rod to separate the pump chamber, and the annular cylinder provided on the outer periphery of the cylinder and the suspension spring holder movably mounted on the outer periphery of the cylinder. A suction passage that allows only a flow from the extension side chamber to the pump chamber side through communication between the pump chamber and the extension side chamber, a supply passage that connects the pump chamber and the jack chamber, and a middle of the supply passage What is provided with the vehicle height adjustment port which connects a compression side chamber is known (for example, refer to patent documents 1).

  In this shock absorber with height adjustment function, in the extension stroke, the volume of the pump chamber becomes larger and sucks hydraulic oil through the suction passage, and in the compression stroke, the volume of the pump chamber becomes smaller and the supply passage becomes smaller. The hydraulic oil is supplied to the jack chamber through the pumping operation by repeatedly expanding and contracting, gradually increasing the volume of the jack chamber and increasing the distance between the suspension spring holder and the cylinder end. The vehicle height can be increased, and when a predetermined vehicle height is reached, the vehicle height adjustment port allows the hydraulic oil in the jack chamber to escape to the pressure side chamber by connecting the supply passage and the pressure side chamber, and the vehicle height is predetermined. The vehicle height is maintained.

  In other words, even when the vehicle body weight in the vehicle changes due to the increase or decrease in the number of passengers or the change in the product load, the vehicle height is set to the predetermined vehicle height by the operation at the time of expansion / contraction in the shock absorber with the vehicle height adjustment function as described above. Is maintained.

Furthermore, when the volume of the jack chamber becomes larger than a predetermined size, the suspension spring receiver comes out of the annular cylinder and falls off. Therefore, in this situation, the reservoir chamber and the jack chamber arranged in series above the compression side chamber The hydraulic oil is allowed to flow from the jack chamber to the reservoir chamber to prevent further expansion of the jack chamber and prevent the suspension spring holder from falling off the annular cylinder.
JP 2000-145873 A (FIG. 1)

  As described above, in the conventional shock absorber with a vehicle height adjusting function, the jack chamber formed on the outer periphery of the cylinder needs to be opposed to the reservoir chamber in order to prevent the suspension spring receiver from falling off the annular cylinder. Therefore, the reservoir chamber is arranged on one end side of the shock absorber with a vehicle height adjusting function.

  As described above, when the configuration in which the reservoir chamber is arranged on one end side of the shock absorber with the vehicle height adjusting function, the reservoir chamber that does not contribute to the stroke length at all increases the total length of the shock absorber with the vehicle height adjusting function. The mountability of the shock absorber with a vehicle height adjusting function on the vehicle will be deteriorated.

  Accordingly, the present invention has been developed to improve the above-described problems, and an object of the present invention is to improve the mountability of a shock absorber with a vehicle height adjusting function in a vehicle.

  In order to solve the above-described object, a shock absorber with a vehicle height adjusting function in the problem solving means of the present invention includes a shock absorber main body including a cylinder and a piston that divides the inside of the cylinder into a compression side chamber and an extension side chamber, and a shock absorber. The pump chamber that is expanded and contracted by the expansion and contraction of the main body, the jack chamber facing the suspension spring receiver that is movably mounted on the outer periphery of the cylinder, and the pump chamber and the extension side chamber communicate with each other from the extension side chamber to the pump chamber side. A suction passage that allows only the flow toward it, a supply passage that connects the pump chamber and the jack chamber, a vehicle height adjustment port that connects the middle of the supply passage and the pressure side chamber, and the shock absorber body is provided outside the cylinder And a reservoir chamber communicating with the inside of the cylinder is provided in the container.

  According to the shock absorber with a vehicle height adjusting function of the present invention, the volume of the pump chamber is increased / decreased by the expansion / contraction operation of the shock absorber body, and the fluid is supplied to the jack chamber by the pumping operation to increase the total length of the shock absorber with the vehicle height adjusting function. The predetermined length can be maintained by increasing the length to a predetermined length, whereby the vehicle height of the vehicle can be maintained at a predetermined height.

  A throttle and a check valve that allows only the flow from the pump chamber side to the jack chamber side are provided in parallel in the middle of the supply passage from the vehicle height adjustment port to the jack chamber side. Even if the jack chamber and the pressure side chamber R are in communication with each other, the throttle functions as a resistance to the flow of hydraulic oil from the jack chamber to the pressure side chamber, so even if the opening cross-sectional area of the vehicle height adjustment port is increased, There is no problem that the vehicle height suddenly decreases when the vehicle body is pitched.

  That is, in the shock absorber with a vehicle height adjustment function of the present invention, it is possible to make the opening cross-sectional area of the vehicle height adjustment port larger than the conventional one, and by setting the opening cross-sectional area of the vehicle height adjustment port to be large, In the state where the vehicle height adjustment port communicates the supply passage with the pressure side chamber, the situation in which the vehicle height adjustment port prevents the flow of hydraulic oil from the pump chamber to the pressure side chamber can be prevented. Since the hydraulic oil supplied from the pump chamber P surely flows out from the vehicle height adjustment port to the pressure side chamber when the vehicle should not be supplied, the vehicle height becomes equal to or higher than the predetermined vehicle height. is there.

  Therefore, in the shock absorber with a vehicle height adjusting function of the present invention, the vehicle height can be reliably maintained at a predetermined vehicle height.

  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 with a vehicle height adjusting function according to an embodiment of the present invention.

  In the present embodiment, the shock absorber 1 with a vehicle height adjusting function is particularly suitable for application between a swing arm that supports a rear wheel shaft (not shown) and a vehicle body. As shown in FIG. 2, a shock absorber body D having a cylinder 2 and a piston 3 that partitions the inside of the cylinder 2 into a compression side chamber R1 and an expansion side chamber R2, and a pump chamber P that is expanded and contracted by expansion and contraction of the shock absorber body D And a jack chamber J facing the suspension spring receiver 4 provided on the outer periphery of the cylinder 2 and movably mounted on the cylinder 2, and the pump chamber P and the extension side chamber R2 communicate with each other from the extension side chamber R2 to the pump chamber P side. A suction passage 5 that allows only a flow toward the vehicle, a supply passage 6 that connects the pump chamber P and the jack chamber J, a vehicle height adjustment port 7 that connects the middle of the supply passage 6 and the pressure side chamber R1, and a supply passage In the middle of 6 And a check valve 9 which permits flow only toward the aperture 8 and the pump chamber P side are provided in parallel jack chamber J side to the jack chamber J side is composed of 7.

  Hereinafter, each part will be described. First, the shock absorber body D includes a cylinder 2, a piston 3 that divides the inside of the cylinder 2 into a compression side chamber R1 and an extension side chamber R2, a hollow piston rod 10 whose tip side is connected to the piston 3, and a compression side chamber R1. And a reservoir chamber R3 communicated therewith. Then, the compression side chamber R1, the extension side chamber R2 and the reservoir chamber R3 are filled with a fluid. In this case, the fluid is specifically, for example, hydraulic oil.

  Specifically, a rod guide 11 into which a piston rod 10 is slidably inserted is attached to the lower end in FIG. 1 of the cylinder 2. The rod guide 11 supports the piston rod 10 and supports the cylinder 2. The lower end of is closed. Further, the piston rod 10 is hollow with a hollow portion 10a that opens from the upper end side in FIG. 1 as the tip, and the piston 3 is fixedly attached to the outer periphery of the tip. Further, a bush (not shown) having an anti-vibration rubber is attached to the lower end in FIG. 1 of the piston rod 10 so that the shock absorber body D can be connected to the swing arm side of the motorcycle. A mold bracket 10b is provided.

  Further, the piston 3 connected to the tip of the piston rod 10 is provided with passages 3a and 3b communicating the compression side chamber R1 and the extension side chamber R2, and the upper end of the passage 3a is stacked on the upper side of the piston 3. The lower end of the passage 3b is closed by a leaf valve 18 stacked on the lower side of the piston 3.

  Therefore, the passage 3a allows only the flow of the hydraulic oil from the expansion side chamber R2 to the compression side chamber R1, and gives resistance to the flow of the hydraulic oil by the leaf valve 17, and the other passage 3b extends from the compression side chamber R1 to the expansion side chamber. Only the flow of the hydraulic oil to R2 is allowed, and the leaf valve 18 provides resistance to the flow of the hydraulic oil.

  Further, a cap 12 for closing the upper end of the cylinder 2 is attached to the upper end of the cylinder 2 in FIG. 1, and this cap 12 is inwardly connected so that the shock absorber body D can be connected to the vehicle body side of the motorcycle. A mounting hole 12a in which a bush (not shown) having a vibration-proof rubber is mounted and a through-hole 12b communicating with the inside and outside of the cap 12 are provided.

  The reservoir chamber R3 is formed in a container 13 provided outside the cylinder 2, and a partition member 14 for partitioning the container 13 into a reservoir chamber R3 and a space L is provided in the container 13. In addition, a free piston 29 is slidably inserted to define a gas chamber A. The space L communicates with the pressure side chamber R1 through the conduit 30 and the through hole 12b, and further communicates with the reservoir chamber R3 through passages 14a and 14b provided in the partition member 14. In addition, the pipe line 30 may be set not to bend according to the vehicle to which the shock absorber with a vehicle height adjusting function is applied, or may be set to have flexibility.

  A check valve 15 is stacked on the upper side of the partition member 14 in FIG. 1, and a leaf valve 16 is stacked on the lower side of the partition member 14 in FIG. 1, and the check valve 15 has an upper end of the passage 14a. The leaf valve 16 closes the lower end of the passage 14b. The passage 14a allows only the flow of hydraulic oil from the reservoir chamber R3 to the pressure side chamber R1, and the other passage 14b has the pressure side chamber. Only the flow of the hydraulic oil from R1 to the reservoir chamber R3 is allowed, and a resistance is given to the flow of the hydraulic oil by the leaf valve 16.

  That is, in this embodiment, the partition member 14 and the leaf valves 15 and 16 function as base valves, and the reservoir chamber R3 and the base valve are provided separately from the cylinder 2 in the container 13 provided outside. I have to.

  Note that the check valve 15 provided in the passage 14a can be various known check valves regardless of the configuration shown in the drawing, and even in the passage 14b, the pressure chamber R1 is connected to the reservoir chamber. Since it is sufficient that only the flow of the hydraulic oil to R3 is allowed and resistance can be given to the flow of the hydraulic oil, various known resistance elements other than the leaf valve 16 can be adopted as the resistance element.

  Subsequently, the pump chamber P includes a hollow piston rod 10 and a pump rod 19 whose base end is connected to the cylinder 2 via the cap 12 and is slidably inserted into the hollow portion 10a of the piston rod 10. The volume is increased by the extension of the shock absorber body D, and conversely, when the shock absorber body D is compressed, the volume is decreased.

  On the other hand, the jack chamber J includes an annular housing 21 provided on the outer periphery of the cylinder 20 attached to the outer periphery of the cylinder 2 and an annular suspension spring receiver 4 slidably attached to the outer periphery of the cylinder 20. It is defined.

  Specifically, the housing 21 includes a cylindrical portion 21a that is opposed to the cylindrical body 20 with a predetermined interval, and a flange portion 21b that protrudes from the upper end of the cylindrical portion 21a toward the inner peripheral side. The other suspension spring receiver 4 includes a spring receiving body 4a that includes a cylindrical portion 22 that is in sliding contact with the outer periphery of the cylindrical body 20, a flange portion 23 that protrudes to the outer periphery of the lower end of the cylindrical portion 22, and a lower end of the spring receiving main body 4a. And a seat portion 4b that is in contact with the suspension spring S, and the cylinder portion 22 of the suspension spring receiver 4 is slidably inserted into the cylinder portion 21a of the housing 21 so that the suspension spring receiver A jack chamber J facing the suspension spring receiver 4 is formed between the housing 4 and the housing 21.

  The suspension spring S is sandwiched between the suspension spring receiver 4 and the suspension spring receiver 42 attached to the lower end of the piston rod 10 and is integrally attached to the shock absorber body D.

  Further, in order to restrict the lower limit of the movement of the suspension spring receiver 4 with respect to the cylinder 20, a snap ring 24 is fitted to the outer periphery of the lower end of the cylinder 20 to prevent the housing 21 from moving upward relative to the cylinder 20. A snap ring 25 is fitted to the outer periphery of the upper end of the cylindrical body 20. The reason why the downward movement of the housing 21 relative to the cylindrical body 20 is not restricted is that the suspension spring S is held between the suspension spring receivers 4 and 42 in a compressed state, and the housing 21 is always the suspension spring receiver 4 alone or Since the suspension spring 4 and the jack chamber J are biased upward via hydraulic oil, there is no need to restrict the downward movement of the housing 21 relative to the cylindrical body 20. is there.

  Note that the suspension spring receiver 4 and the housing 21 may be directly mounted on the outer periphery of the cylinder 2 and the cap 12 without providing the cylinder 20 on the outer periphery of the cylinder 2, but the cylinder 20 is provided. Thus, the strength of the shock absorber body D is compensated for, and adverse effects such as deformation due to the pressure in the jack chamber J can be prevented, and further, the cylinder strength can be reduced by providing the mounting grooves for the snap rings 24 and 25 to the cylinder 2. There is an advantage that it can be prevented.

  Returning, the pump rod 19 is shaped like a pipe, the base end is inserted into the hole 12c provided in the center of the cap 12, and fixed to the cap 12 by the snap ring 26, and at a predetermined position in the intermediate portion. A vehicle height adjustment port 7 that communicates the inside and outside of the pump rod 19 is opened.

  In the case of the shock absorber 1 with the vehicle height adjusting function in this embodiment, a throttle valve 27 is provided in the middle of the supply passage 6, and the hydraulic oil that moves from the pump chamber P to the jack chamber J is always used for this throttle valve. 27 is set to pass. Specifically, the throttle valve 27 is provided at the center of the plug 28 that is press-fitted into the inner periphery of the tip of the pump rod 19. The plug 28 may be provided by being screwed to the inner periphery of the tip of the pump rod 19.

  Further, the hole 12c of the cap 12 includes a passage 12d provided in the cap 12, an annular groove 12e provided on the outer periphery of the cap 12, a hole 2a provided in the cylinder 2 so as to face the annular groove 12e, and a cylindrical body. 20, the jack chamber J communicates with the pump chamber P through a hole 20a provided so as to face the jack chamber J and the hole 2a. That is, in this embodiment, the supply passage 6 that connects the pump chamber P and the jack chamber J is formed in the pump rod 19, the hole 12c, the passage 12d, the annular groove 12e, and the holes 2a and 20a. Yes.

  Further, a valve body 40 having a hole functioning as a throttle 8 at the center is laminated on the upper end in FIG. 1 which is the base end of the pump rod 19, in addition to the throttle valve 27 described above. 1 is always urged in a direction to close the upper end in FIG. 1 which is the base end of the pump rod 19 by a spring 41 interposed between the valve body 40 and the bottom of the hole 12c in FIG. Yes. A check valve 9 is constituted by the valve body 40 and the spring 41, and this check valve 9 is provided in the jack chamber J side from the vehicle height adjustment port 7 in the middle of the supply passage 6. The supply passage 6 is always kept in communication with the restriction 8 provided in the body 40, and the restriction 8 and the check valve 9 are arranged in parallel with the supply passage 6.

  The throttle 8 and the check valve 9 may be arranged in the middle of the supply passage 6 and in parallel to the jack chamber J side from the vehicle height adjustment port 7 by a configuration other than that described above. 1 is used as the base end of the pump rod 19 in FIG. 1, the throttle 8 and the check valve 9 can be arranged in parallel in the supply passage 6 with a small space and a small number of parts. Thus, the shock absorber 1 with a vehicle height adjusting function can be reduced in size.

  The pump chamber P communicates with the expansion side chamber R2 through a through hole 10c that opens from the side of the piston rod 10 facing the expansion side chamber R2 and communicates with the hollow portion 10a of the piston rod 10. A check valve 31 to be assembled with the piston 3 at the tip of the piston rod 10 is provided on the opening end side of the through hole 10c on the extension side chamber R2, and the check valve 31 is connected to the pump chamber from the extension side chamber R2. Only the flow of hydraulic oil toward P is allowed. That is, the suction passage 5 is constituted by the through hole 10c and the check valve 31 in the case of the present embodiment. Specifically, the check valve 31 is opposed to the through hole 10c by two disks 32 and 33 assembled to the distal end of the piston rod 10 from the piston 3 to the expansion side chamber R2 side, and through the hole 32a to the expansion side chamber R2. A valve chamber 34 to be communicated is formed, and a valve body 35 urged in a direction to close the hole 32a is accommodated in the valve chamber 34.

  Below the disk 32, a disk 37 that abuts the cushion 36 stacked on the upper end of the rod guide 11 is assembled at the tip of the piston rod 10 like the disk 32. Since the layer is directly laminated on 32, a recess 37a is formed so as not to close the hole 32a.

  By providing this disk 37, when the shock absorber body D is fully extended, no load is applied to the check valve 31, and there is no problem that the hole 32a is blocked by the cushion 36. In addition, the cushion 36 is not pinched at the end of the hole 32a.

  As described above, the pump chamber P configured in this manner increases its volume when the shock absorber body D extends, and sucks the hydraulic oil in the expansion side chamber R2 through the suction passage 5, and conversely, When the shock absorber main body D is compressed, the volume decreases, and hydraulic oil is supplied to the jack chamber J through the supply passage 6. In addition, since the pump chamber P is set to increase the volume when the shock absorber main body D is extended and suck the hydraulic oil from the expansion side chamber R2 that is at a high pressure, the hydraulic oil cannot be sucked when the shock absorber main body D is extended. Therefore, the pumping operation can be performed reliably.

  When the shock absorber main body D is less than a predetermined length, the vehicle height adjusting port 7 faces the inner surface of the hollow portion 10a of the piston rod 10 and the shock absorber main body D is at a predetermined length. Above, the vehicle height adjustment port 7 is set to face the compression side chamber R1. That is, when the shock absorber body D is less than the predetermined length, the pump rod 19 is inserted deeply into the hollow portion 10a of the piston rod 10, and the portion of the pump rod 19 where the vehicle height adjustment port 7 is provided is the piston. When the vehicle height adjustment port 7 is inserted into the rod 10 and is closed by the inner surface of the hollow portion 10a, and the shock absorber body D is longer than a predetermined length, the pump rod 19 is connected to the piston rod 10. The portion of the pump rod 19 where the vehicle height adjustment port 7 is provided protrudes from the piston rod 10 so as to face the compression side chamber R1, and the vehicle height adjustment port 7 is connected to the compression side chamber. It seems to communicate with R1.

  In the present embodiment, a socket 38 having a smaller diameter than the outer diameter of the tip of the piston rod 10 that fits into the hollow portion 10a and slidably contacts the outer periphery of the pump rod 19 is attached to the tip of the piston rod 10. The vehicle height adjustment port 7 is opened and closed by the socket 38. By using the socket 38 in this way, the tip of the piston rod 10, which tends to be long in a shock absorber with a vehicle height adjustment function for opening and closing the vehicle height adjustment port 7, is about the same as a normal shock absorber. While being able to set, it becomes possible to suppress the weight increase of the buffer 1 with a vehicle height adjustment function.

  When the shock absorber body D expands and contracts within a predetermined length, the vehicle height adjustment port 7 is closed, so that the pump chamber P is jacked via the supply passage 6 by the pumping operation. Since hydraulic oil is supplied to the chamber J, the volume of the jack chamber J increases, and the suspension spring receiver 4 is pushed downward with respect to the cylinder 2 in FIG. 1, so that the total length of the shock absorber 1 with the vehicle height adjusting function becomes longer. The vehicle height can be increased. Further, when supplying hydraulic oil from the pump chamber P to the jack chamber J by the pumping operation, the valve body 40 is separated from the base end which is the upper end in FIG. 1 of the piston rod 10 against the urging force of the spring 41. Since the supply passage 6 is largely opened, the hydraulic oil passes through the supply passage 6 without resistance and moves to the jack chamber J, and the vehicle height can be increased quickly.

  Furthermore, in the shock absorber 1 with the vehicle height adjusting function in the present embodiment, when the hydraulic oil is excessively supplied to the jack chamber J and the volume of the jack chamber J increases excessively, specifically, When the volume of the jack chamber J exceeds a predetermined value, a relief port 39 penetrating the cylindrical body 20 and the cylinder 2 is provided, and the jack chamber J is communicated with the pressure side chamber R1 through the relief port 39. The situation in which hydraulic oil flows out from the jack chamber J and the suspension spring receiver 4 comes out of the housing 21 does not occur. The predetermined volume of the jack chamber J when the relief port 39 is opened is set to be less than the volume at which the suspension spring receiver 4 may come out of the housing 21.

  In the case of the present embodiment, the relief port 39 is not communicated with the reservoir chamber R3, but is communicated with the pressure side chamber R1 that tends to be higher in pressure than the reservoir chamber R3. When the hydraulic oil flows out to the pressure side chamber R1, the pressure reduction in the pump chamber P is not increased and the damping force generated by the shock absorber 1 with the vehicle height adjusting function is rapidly reduced. Such a situation does not occur, and the change in the posture of the motorcycle does not abruptly cause the passenger to feel uncomfortable or impair the riding comfort of the vehicle.

  Subsequently, when the shock absorber body D is within a predetermined length or more, the vehicle height adjustment port 7 is in communication with the compression side chamber R1, so the jack chamber J has the supply passage 6 and the vehicle height adjustment. It is communicated with the pressure side chamber R1 via the port 7 so that hydraulic oil can flow out from the jack chamber J to the pressure side chamber R1, and the suspension spring receiver 4 and the housing 21 come close to each other due to the load of the vehicle body. The jack chamber J is crushed and the volume is reduced until the shock absorber body D in which the adjustment port 7 is closed is less than the predetermined length, and the total length of the shock absorber 1 with vehicle height adjusting function is shortened to the predetermined length. The vehicle height is lowered to a predetermined vehicle height and maintained in that state.

  As described above, the shock absorber 1 with the vehicle height adjusting function according to the present embodiment increases or decreases the volume of the pump chamber P by the expansion / contraction operation of the shock absorber body D, similarly to the conventional shock absorber with the vehicle height adjusting function. Thus, the fluid can be supplied to the jack chamber J so that the total length of the shock absorber 1 with the vehicle height adjusting function can be increased to a predetermined length to maintain the predetermined length, whereby the vehicle height of the motorcycle is set to a predetermined height. To maintain.

  In the shock absorber 1 with the vehicle height adjusting function in the present embodiment, the reservoir chamber R3 is provided in the container 13 separate from the cylinder 2, so that the outer diameter of the shock absorber body D is increased. It is possible to increase the effective stroke length without increasing the size of the shock absorber 1 with the vehicle height adjusting function and to improve the mountability of the shock absorber 1 with the vehicle height adjusting function on the vehicle. It becomes possible.

  Furthermore, in the case of the shock absorber 1 with the vehicle height adjusting function in this embodiment, the base valve is provided in the container 13 separate from the cylinder 2, so that the total length of the shock absorber 1 with the vehicle height adjusting function remains the same. The effective stroke length can be set much longer, and the mountability of the shock absorber 1 with the vehicle height adjusting function can be remarkably improved.

  Further, in the shock absorber 1 with the vehicle height adjusting function, it is in the middle of the supply passage 6 and from the vehicle height adjusting port 7 to the jack chamber J side, and from the throttle 8 and the pump chamber P side to the jack chamber J side. A check valve 9 that allows only a flow is provided in parallel, and the hydraulic oil that travels from the jack chamber J to the pressure side chamber R1 even when the vehicle height adjustment port 7 communicates with the jack chamber J and the pressure side chamber R1. Must always pass through the throttle 8, and the throttle 8 functions as a resistance to the flow of hydraulic oil from the jack chamber J to the compression side chamber R1, so even if the opening cross-sectional area of the vehicle height adjustment port 7 is increased, There is no problem that the vehicle height suddenly decreases when the vehicle body is pitched.

  That is, in the shock absorber 1 with the vehicle height adjusting function in the present embodiment, the opening cross-sectional area of the vehicle height adjusting port 7 can be made larger than that of the conventional one. By setting the area large, the vehicle height adjustment port 7 prevents the flow of hydraulic oil from the pump chamber P to the pressure side chamber R1 when the vehicle height adjustment port 7 communicates the supply passage 6 with the pressure side chamber R1. When the hydraulic oil should not be supplied from the pump chamber P to the jack chamber J, the hydraulic oil supplied from the pump chamber P can be reliably discharged from the vehicle height adjustment port 7 to the pressure side chamber R1. The problem that the height is higher than the predetermined vehicle height is eliminated.

  Therefore, in the shock absorber 1 with the vehicle height adjusting function, the vehicle height can be reliably maintained at a predetermined vehicle height.

  Furthermore, in the case of the shock absorber 1 with the vehicle height adjusting function in this embodiment, a throttle valve 27 is provided in the middle of the supply passage 6, and the hydraulic oil that moves from the pump chamber P to the jack chamber J is always this Since it is set so as to pass through the throttle valve 27, the flow rate of the hydraulic oil supplied from the pump chamber P to the jack chamber J is limited by the throttle valve 27, and the hydraulic oil is excessively supplied to the jack chamber J. There is also no problem that will end up.

  Further, since the flow rate of the hydraulic oil supplied from the pump chamber P to the jack chamber J is limited by the throttle valve 27 and the hydraulic oil is not excessively supplied to the jack chamber J, the volume of the jack chamber J is increased. Is prevented from being repeated too frequently, and the operation of lowering to a predetermined vehicle height after the vehicle height has become excessively high is prevented from being repeated frequently, and the vehicle is stabilized at a predetermined vehicle height aimed at the vehicle height. It becomes possible.

  In the present invention, the throttle 8 and the throttle valve 27 are not necessarily provided. However, as can be understood from the above description, the throttle valve 27 is used for the fluid supplied from the pump chamber P to the jack chamber J. The restrictor 8 exerts a function of restricting the flow rate of the fluid flowing from the jack chamber J to the pressure side chamber R1. Since the flow rate limitation of the fluid supplied from the pump chamber P to the jack chamber J and the flow rate limitation of the fluid flowing out from the jack chamber J to the pressure side chamber R1 are performed by different throttles 8 and throttle valves 27, respectively. It is possible to achieve both suppression of vehicle height change due to pitching and the like and suppression of excessive vehicle height, and setting each of these suppression effects individually to be optimal. Therefore, while expecting the effect of the throttle 8 and the check valve 9, the flow rate of the hydraulic oil moving from the pump chamber P to the jack chamber J is limited to prevent a problem that the hydraulic oil is excessively supplied to the jack chamber J. From the point of view, the throttle valve 27 is preferably disposed on the pump chamber P side of the vehicle height adjustment port 7 in the middle of the supply passage 6. Further, from the viewpoint of restricting the flow rate of the hydraulic oil moving from the pump chamber P to the jack chamber J and preventing the hydraulic oil from being excessively supplied to the jack chamber J, if in the supply passage 6, The throttle valve 27 may be arranged at any position. Further, when the throttle valve 27 has a function as the throttle 8, the throttle valve 27 is moved from the vehicle height adjustment port 7 to the jack chamber J side. It is also possible to dispose the restrictor 8 and the check valve 9 by disposing them.

 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.

 Further, in the above description, it is assumed that the hydraulic shock absorber 1 with a vehicle height adjusting function is applied to a motorcycle, but the shock absorber 1 with a vehicle height adjusting function of the present invention is applied to other vehicles. Of course, the above-described effects can be exhibited.

It is a longitudinal cross-sectional view of the shock absorber with a vehicle height adjustment function in one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shock absorber with vehicle height adjustment function 2 Cylinders 2a, 12c, 20a, 32a Hole 3 Pistons 3a, 3b Passage 4, 42 Suspension spring support 4a Spring support body 4b Seat part 5 Suction passage 6 Supply passage 7 Vehicle height adjustment port 8 Restriction 9, 15, 31 Check valve 10 Piston rod 10a Hollow portion 10b Eye bracket 10c Through hole 11 Rod guide 12 Cap 12a Mounting hole 12b Through hole 12d Passage 12e Annular groove 13 Container 14 Partition members 14a, 14b Passages 16, 17, 18 Leaf valve 19 Pump rod 20 Cylinder body 21 Housing 21a, 22 Cylinder part 21b, 23 Flange part 24, 25, 26 Snap ring 27 Throttle valve 28 Plug 29 Free piston 30 Pipe line 32, 33, 37 Disc 34 Valve chamber 35, 40 Valve body 36 Cushion 37a Recess 38 Socket 39 Fupoto 41 spring A gas chamber D snubber body J jack chamber L space P pump chamber R1 compression side chamber R2 expansion side chamber R3 reservoir chamber S suspension spring

Claims (4)

A shock absorber body including a cylinder and a piston that divides the cylinder into a compression side chamber and an expansion side chamber, a pump chamber that is expanded and contracted by expansion and contraction of the shock absorber body, and a suspension spring that is movably mounted on the outer periphery of the cylinder A jack chamber facing the receiver, a suction passage that allows the pump chamber and the extension side chamber to communicate with each other and allows only a flow from the extension side chamber toward the pump chamber, a supply passage that connects the pump chamber and the jack chamber, and a supply passage In the shock absorber with a vehicle height adjustment function having a vehicle height adjustment port that communicates between the pressure side chamber and the compression side chamber, the shock absorber body has a container provided outside the cylinder, and is communicated with the cylinder within the container. A shock absorber with a vehicle height adjusting function, characterized in that a reservoir chamber is provided. A partition member for partitioning the reservoir chamber and the pressure side chamber is provided in the container, and the partition member allows only a fluid flow from the reservoir chamber to the pressure side chamber and a fluid flow from the pressure side chamber to the reservoir chamber. The shock absorber with a vehicle height adjusting function according to claim 1, further comprising a communication that allows and allows resistance to the flow of the fluid. The shock absorber with a vehicle height adjusting function according to claim 1 or 2, wherein the jack chamber communicates with the compression side chamber when the volume exceeds a predetermined volume. The pump chamber is defined by a hollow piston rod having a distal end connected to the piston and a pump rod having a proximal end connected to the cylinder and slidably inserted into the piston rod. The shock absorber with a vehicle height adjusting function according to any one of claims 1 to 3.

Images