JP2010023707A - Vehicle height adjusting unit and vehicle height adjusting suspension device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform elevation adjustment of a vehicle body, without causing leakage of the pressure fluid which is to be supplied. <P>SOLUTION: A vehicle height adjusting unit for adjusting the vehicle height, by making advanced and retreated an expansion rod of a shock absorber S which includes a cylinder 50 having a fluid pressure chamber Ra, where the fluid is flowed in and out, and a plunger 14 interposed in the fluid pressure chamber Ra. The vehicle height adjusting unit includes an inside wall part 2, where the cylinders 50 are opposed at the outside of a coil spring 55, and an outside wall part 3 spaced from the inside wall part 2. The fluid pressure chamber Ra is formed between the inside wall part 2 and the outside wall part 3, the plunger 14 is provided so as to move back and forth in the axial direction of the coil spring 55. Either the cylinder 50 or the plunger 14 is connected and is fixed to the expansion rod 51 so as to enable advancement and retreat to and from the expansion rod 51, and the remaining other side is abutted against the coil spring 55. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle height adjustment unit and a vehicle height adjustment suspension device used for adjusting vehicle heights of various vehicles.

  In recent years, regardless of the one-box type or sports type vehicle type, driving stability and vehicle design have come to be emphasized, and vehicle height regulations have been relaxed, and there is a tendency for low flooring. Although this improves the above-described stability and design, for example, the vehicle height may need to be adjusted when getting over a pavement (step) or getting off the pavement.

  A conventional vehicle height adjusting suspension device manufactured in response to this requirement will be described with reference to FIG. This vehicle height adjustment suspension device is provided with a cylinder 50 connected to an axle (not shown), and can be moved forward and backward in the cylinder 50, and a screw portion 52 at the tip portion penetrates the vehicle body A, and a nut N is screwed into the screw portion 52. A shock absorber S having a telescopic rod 51 attached and fixed, and a coil spring 55 externally fitted to the telescopic rod 51 in a state where the lower end portion is supported by an annular spring support 56 attached to the cylinder 50. The telescopic rod 51 is penetrated in the axial direction, inserted into the cylinder 60 fixed to the vehicle body A, and the fluid pressure chamber 80 of the cylinder 60, and expanded and contracted in contact with the coil spring 55. A plunger 70 is provided so as to be movable in the axial direction with respect to the rod 51.

  The cylinder 60 is in contact with the vehicle body A and has an annular contact portion 61 that is in contact with the outer peripheral surface of the telescopic rod 51, and a cylindrical covering that extends from the periphery of the contact portion 61 and covers the outside of the plunger 70. Part 62. An annular groove 61a is formed on the inner peripheral surface of the abutting portion 61, and a packing P for securing a sealing property with respect to the telescopic rod 51 is fitted into the groove 61a.

  The plunger 70 is an annular rod-side sliding portion 71 that slides on the telescopic rod 51, and a cylindrical covering portion 72 that is suspended from the peripheral edge of the rod-side sliding portion 71 and covers the outside of the coil spring 55. An annular cylinder side sliding portion 73 projecting from the outer peripheral surface of the covering portion 72 and sliding on the inner peripheral surface of the lower end opening 63 of the cylinder 60, and an outer peripheral surface of the lower end of the cylinder side sliding portion 73 And a flange-like stopper 74 that is formed so as to protrude radially outward and that abuts against the opening end surface of the cylinder 60 and restricts upward movement. The rod-side sliding portion 71 of the plunger 70 is formed with an annular groove 71a as well as the contact portion 61 of the cylinder 60, and a packing P is inserted into the groove 71a, so that the sealing performance is improved. The plunger 70 is configured to be slidable with respect to the telescopic rod 51 after being secured. A similar packing P is also provided on the outer peripheral surface of the cylinder side sliding portion 73, and the plunger 70 can slide on the inner peripheral surface of the cylinder 60 while ensuring sealing performance. It has become.

  A fluid pressure chamber 80 through which fluid flows in and out is formed between the inner surface of the cylinder 60 and the outer surface of the plunger 70. The fluid pressure chamber 80 includes an annular upper space 80 a formed between the contact portion 61 of the cylinder 60 and the rod side sliding portion 71 of the plunger 70, a covering portion 72 of the cylinder 60, and a covering portion of the plunger 70. 72 and a cylindrical side space 80b formed between the two.

  Although not shown, the cylinder 60 is provided with an air valve mounting portion for introducing and discharging air into the fluid pressure chamber 80, and a predetermined valve is mounted on the air valve mounting portion. As an air supply / discharge device, for example, a device provided with an air tank and a compressor connected to the air tank is used, which is mounted on the vehicle body A, and a switch provided in the driver's seat is operated. Thus, air is introduced from the air tank to the vehicle height adjustment unit.

  The air supply is determined by the driver, and is not limited to the case where there is a level difference. In the case of rough roads with unevenness, the air to be supplied in the case of flat roads paved with asphalt. The vehicle height can be adjusted by appropriately adjusting the amount of the vehicle.

  Next, the usage mode will be described. First, in the state of FIG. 6, no fluid (air) is supplied to the fluid pressure chamber 80, the stopper 74 of the plunger 70 contacts the opening end surface of the cylinder 60, and the telescopic rod 51 of the cylinder 50 moves to the coil spring. It is in a state of being held at the low-down position by the elastic force of 55.

  Then, when it is necessary to adjust the vehicle height to get over the pavement (step), when fluid (air) is supplied from the state of FIG. 6 to the fluid pressure chamber 80, as shown in FIG. The air supplied to the chamber 80 presses the flat end surface of the rod-side sliding portion 71 of the plunger 70 and the annular flat surface of the cylinder-side sliding portion 73, and the plunger 70 is pushed downward. At this time, the coil spring 55 is lowered while maintaining the spring length without being compressed and deformed by the air, and the cylinder 50 moves downward in proportion to the movement of the plunger 70. Therefore, the shock absorber S extends, and the vehicle body A held at the low-down position is lifted, and the vehicle can get over the step without damaging the vehicle body A.

  However, since the conventional vehicle height adjustment suspension device receives the load of the vehicle body A, the impact from the road surface, the vibration of the vehicle body A, and the like, the shock absorber S (particularly the telescopic rod 51) is distorted when moving forward and backward. There is a problem in that a gap is formed between the outer peripheral surface of the telescopic rod 51 and the seal portion (packing P) of the cylinder 60 and the plunger 70, causing air leakage, which hinders the adjustment of the lifting and lowering of the vehicle body A. is there.

  Therefore, in view of the above problems, the present invention has an object to provide a vehicle height adjustment unit and a vehicle height adjustment suspension device that can smoothly perform up-and-down adjustment of a vehicle body without causing leakage of supplied fluid. It is said.

  In order to solve the above problems, a vehicle height adjustment unit according to the present invention is provided with a cylinder, a shock absorber having a telescopic rod whose tip is connected to the vehicle body, and a shock absorber provided at the front and rear of the cylinder. It is attached to a suspension device that has a coil spring that is externally fitted to the telescopic rod with the lower end supported by a spring cradle attached to the absorber, and adjusts the vehicle height by moving the telescopic rod back and forth. In the vehicle height adjustment unit, a cylinder that forms an internal space through which fluid flows in and out, and a plunger that is inserted into the internal space, the cylinder includes an inner wall portion that is opposed to the outside of the coil spring, The inner wall portion and an outer wall portion provided at an interval, and the fluid pressure chamber is formed between the inner wall portion and the outer wall portion, The ranger is provided so as to be able to advance and retreat in the axial direction of the coil spring, and further, either the cylinder or the plunger is connected and fixed to the expansion / contraction rod so that the expansion / contraction rod can be advanced / retracted, and the other is connected to the coil spring. It is characterized by being comprised so that it may contact | abut.

  In this case, since either the cylinder or the plunger is connected and fixed to the telescopic rod of the shock absorber, either the cylinder or the plunger is interlocked with the forward / backward movement of the telescopic rod. Further, since the other side is brought into contact with a coil spring provided in the shock absorber, when a fluid flows into the cylinder, the plunger is advanced, and the coil spring is pressed by this advancement movement. At this time, the coil spring presses the cylinder while maintaining the spring length. By this pressing, the telescopic rod is advanced, and the vehicle body is adjusted to be higher.

  And as a cylinder, a cylinder, a square tube, and a cylinder with a circular cross section may be provided alone on the outer periphery of the coil spring, or a plurality of cylinders may be arranged at equal intervals. Moreover, you may make it press the whole cyclic | annular site | part of the upper end part of the coil spring of a shock absorber with the cylinder of a two-layer structure comprised by a cylindrical inner wall part and an outer side wall part.

  In addition, since the cylinder and the plunger are not connected and fixed to the telescopic rod of the shock absorber and do not slide in the fluid pressure chamber as in the prior art, the plunger and the plunger do not leak, and the plunger does not leak. It is possible to move forward and backward smoothly. In addition, although it does not define about the bottom part of a cylinder, the case where it is located in the cylinder side of a shock absorber and the case where it is located in the front-end | tip part side of an expansion-contraction rod shall be included. However, when the bottom portion is positioned on the distal end side of the telescopic rod, the cylinder is fixed to the distal end portion of the telescopic rod, and the plunger comes into contact with the coil spring.

  In addition, when it is necessary to overcome the step, the driver turns on a switch provided in the driver's seat, for example, operates a PTO (power take-off) or a compressor mounted on the vehicle, supplies fluid to the cylinder, Move the plunger forward and adjust the height of the vehicle.

  According to the invention, the inner wall portion is formed in a cylindrical shape so as to cover the coil spring, and the outer wall portion is formed in a cylindrical shape concentrically with the inner wall portion, and between the both side wall portions. An annular lid is provided so as to airtightly close the opening end formed in the slide, and the plunger is inserted between the side walls and slides on the inner surfaces of the side walls. And a cylindrical part having a connecting part connected to the sliding part, and a fixed part closed at one end and connected and fixed to the telescopic rod. The abutting flange may protrude in the radial direction.

  In this case, since the flange of the cylinder is in contact with the entire annular portion of the coil spring, a pressing force can be applied substantially evenly to the coil spring, and the height can be adjusted more smoothly.

  Moreover, according to this invention, the structure which provides a pair of guide which guides the advancing / retreating movement of a plunger to the said inner wall part and the outer wall part can also be selected.

  In this case, the guide may be provided in an annular shape or may be arranged at equal intervals. With this guide, the cylindrical plunger can smoothly advance and retreat along the axial direction of the coil spring.

  Moreover, according to this invention, the structure which fits a wear ring on the sliding part of the said plunger can also be selected.

  In this case, the sliding portion of the plunger can slide without being distorted. That is, the plunger can smoothly move forward and backward along the coil spring axial direction of the shock absorber through the gap between the inner wall portion and the outer wall portion.

  Moreover, according to this invention, you may make it comprise the said vehicle height adjustment unit and comprise a vehicle height adjustment suspension apparatus.

  In this case, the same effects as the vehicle height adjustment unit are obtained.

  As described above, according to the present invention, either the cylinder or the plunger is moved away from the telescopic rod so that the telescopic rod of the shock absorber can be advanced, that is, the telescopic rod is moved through the plunger. Since it is connected and fixed to the telescopic rod at a position where it does not penetrate the fluid pressure chamber, and the other is brought into contact with the coil spring, it is not necessary to seal the telescopic rod as in the prior art. Accordingly, the vehicle height can be adjusted without any trouble without causing fluid leakage.

  Hereinafter, a vehicle height adjusting unit according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol as FIG. 5 shows the same or equivalent, and only a different point is demonstrated below (description of the structure about the shock absorber S is abbreviate | omitted).

  As shown in FIG. 1, the vehicle height adjustment unit of the present invention is connected to a cylinder 1 suspended on an upper end portion of a coil spring 55 that is externally fitted to a telescopic rod 51 of a shock absorber S, and a distal end portion of the telescopic rod 51. The plunger 14 is fixed and has a distal end portion provided in the cylinder 1 so as to freely advance and retract.

  The cylinder 1 includes an inner wall portion 2 concentrically provided at a predetermined interval, an outer wall portion 3, and an annular lid body 10 that seals a lower end opening portion of both the cylindrical portions. . The inner wall portion 2, the outer wall portion 3, and the lid body 10 constitute a bottomed cylindrical body 4 having a two-layer structure.

  In the inner wall portion 2, an annular flange 2 a that abuts on the upper end portion of the coil spring 55 is projected in the radially inward direction. The diameter of the flange 2a is designed to be larger than the diameter of the cylinder 50. The reason for this is that even if the cylinder 50 rises due to an impact from the road surface, a collision with the flange 2a is avoided to ensure a stroke for traveling. That is, a space in which the cylinder 50 can reciprocate between the inner peripheral surfaces of the flange 2a is ensured, and it is designed to ensure good riding comfort even on rough roads. On the other hand, in the case of the vehicle adjustment unit in FIGS. 6 and 7, the rod 50 sliding portion 71 of the plunger 70 is sealed with respect to the telescopic rod 51 so as to form the fluid pressure chamber 80. It will collide with the rod side sliding part 71 of 70, the stroke for driving | running | working cannot be ensured, and riding comfort will worsen.

  There is an internal space between the inner wall 2 and the outer wall 3. This internal space also functions as a reciprocating path R along which the plunger 14 moves back and forth. The reciprocating path R is configured such that a sliding portion 16 of a plunger 14 to be described later is movably inserted so that the lower end surface of the sliding portion 16, the outer peripheral surface of the inner wall portion 2, and the inner periphery of the outer wall portion 3. A space surrounded by the surface and the inner surface of the lid 10, that is, a fluid pressure chamber Ra is formed.

  The outer wall portion 3 has a fluid supply port 3a formed in the lower end portion along the radial direction. The fluid supply port 3a has one end communicating with the reciprocating path R and the other end communicating with the outside. The fluid supply port 3a has a hydraulic supply device such as a PTO (power take-off) mounted on the vehicle. Are connected (not shown). In this case, since the hydraulic pressure does not expand and contract as compared with air, an extra load is not applied to the packing P other than the sliding due to the reciprocating movement of the plunger 15, and there is no fluid leakage.

  Then, female screws 2b and 3b are formed along the outer peripheral surface of the lower end portion of the inner wall portion 2 and the inner peripheral surface of the lower end portion of the outer wall portion 3, and the male screw of the lid 10 to be described later is formed on the female screws 2b and 3b. While 10a is screwed, notches 2c and 3c are formed along the end faces of the upper end portions of the inner wall portion 2 and the outer wall portion 3, and the notch portions 2c and 3c have an inverted L-shaped cross section which will be described later. The guide 5 and the presser plate 6 screwed to the upper surface of the guide 5 are attached.

  The guide 5 is in contact with the horizontal support portion 5 a that contacts the side walls and bottom wall of the notches 2 c and 3 c, the outer peripheral surface of the upper end portion of the inner wall portion 2, and the inner peripheral surface of the upper end portion of the outer wall portion 3. And an upright support portion 5b that comes into contact with an inner peripheral surface and an outer peripheral surface of the connecting portion 20 of the plunger 14, which will be described later. An annular retainer plate 6 is placed on the upper surface of the horizontal support portion 5 a, and screws (not shown) penetrating the retainer plate 6 and the horizontal support portion 5 a are connected to the upper ends of the inner wall portion 2 and the outer wall portion 3. The presser plate 6 and the guide 5 are fixed to the end surfaces of the upper end portions of the inner wall portion 2 and the outer wall portion 3.

  The lid body 10 projects in the length direction from the annular contact portion 10a having the same width as the outer diameter of the inner wall portion 2 and the outer wall portion 3 and the central portion of the corresponding contact portion 10a. The male screw 10b and an annular groove 12 into which the O-ring 11 is fitted are formed above the male screw 10b. As described above, the male screw 10b is screwed with the female screws 2b and 3b, the back surface of the contact portion 10a contacts the end surfaces of the inner wall portion 2 and the outer wall portion 3, and the O-ring 11 Is in close contact with the inner peripheral surface of the inner wall portion 2 and the outer peripheral surface of the outer wall portion 3, and the sealed state of the lower end opening by the inner wall portion 2 and the outer wall portion 3 is maintained.

  The plunger 14 has an annular tip 16 inserted through the reciprocation path R of the inner wall 2 and the outer wall 3 of the cylinder 1 and a tip of the telescopic rod 51 (screw portion 52). An annular fixing portion 19 that has a through-hole 17 and is connected and fixed to the distal end portion of the telescopic rod 51 inserted through the through-hole 17 via an adapter 18, the upper end surface of the distal end portion 16, and the lower surface of the fixing portion 19 It is comprised from the cylindrical connection part 20 which connects the peripheral part of these. Regardless of the forward / backward movement of the distal end portion 16, the fixing portion 19 always protrudes to the outside, and one end is closed and is fixedly connected to the telescopic rod 51. Moreover, the adapter 18 here is for enabling the through-hole 17 to be fixed according to the outer diameter of the telescopic rod 51. Note that a sliding portion that slides on the inner surfaces of the inner wall portion 2 and the outer wall portion 3 is formed in the tip portion 16, and hereinafter, this sliding portion is expressed as the tip portion 16.

  The sliding portion 16 is formed with annular first insertion grooves 22 into which synthetic resin wear rings 21 are respectively inserted on the inner peripheral surface and outer peripheral surface of the upper portion thereof, and at the lower position of the inner peripheral surface of the lower end portion. And the cyclic | annular 2nd insertion groove 23 for inserting packing P in the high position of the outer peripheral surface of a lower part is formed, respectively. Further, an annular fluid supply path 24 communicating with the fluid supply port 3a is formed on the outer peripheral surface of the lower end (below the second insertion groove 23 formed at a high position on the outer peripheral surface). The wear ring 21 here is for the sliding portion 16 to smoothly slide with respect to the outer peripheral surface of the inner wall portion 2 and the inner peripheral surface of the outer wall portion 3.

  The connecting portion 20 is smaller than the thickness dimension of the sliding portion 16, and the inner peripheral surface and the outer peripheral surface of the connecting portion 20 are abutted and supported by the upright support portions 5 b and 5 b of both guides 5 and 5, and slide. The plunger 14 moves up and down on the reciprocation path R of the cylinder 1 while the inner peripheral surface and the outer peripheral surface of the portion 16 are in contact with and supported by the outer peripheral surface of the inner wall portion 2 and the inner peripheral surface of the outer wall portion 3. become.

  In addition, it is preferable that the upper surface of the flange 2a of the inner wall portion 2 of the cylinder 1 and the lower surface of the fixing portion 19 of the plunger 14 are in close contact. The reason is that when the shock absorber S receives an impact from the road surface, if a gap is formed between the upper surface of the flange 2a and the lower surface of the fixed portion 19, the cylinder 1 is raised by the amount of the gap. Therefore, it is conceivable that the end surface of the lower end portion of the sliding portion 16 of the plunger 14 collides with the lid body 10 of the cylinder 1 when it rises. In order to avoid this collision, close contact is made as described above, or the lid 10 is firmly fixed to the lower end portions of the inner wall portion 2 and the outer wall portion 3 and then brought into contact with the tip portion 16. Also good. Alternatively, the lid 10 may be firmly fixed and then brought into contact with the distal end portion 16.

  Next, the usage mode will be described. First, in the state of FIG. 1, no fluid is supplied to the inside of the cylinder 1, and the plunger 14 is retracted, that is, the end face of the lower end portion of the sliding portion 16 of the plunger 14 is applied to the lid 10 of the cylinder 1. The fluid supply path 24 is in contact with the fluid supply port 3a. On the other hand, the telescopic rod 51 of the cylinder 50 is in a retracted state.

  When it becomes necessary to overcome the step, when a fluid (hydraulic pressure in the present embodiment) is supplied from the fluid supply port 3a through the fluid supply path 24 in the state of FIG. 1, the plunger as shown in FIG. 14 sliding portions 16 are pushed upward, and are formed by the end surface of the lower end portion of the sliding portion 16, the outer peripheral surface of the lower portion of the inner wall portion 2, the inner peripheral surface of the outer wall portion 3, and the back surface of the lid 1. The fluid pressure chamber Ra is filled with fluid.

  On the other hand, as the plunger 14 rises, the flange 2a of the inner wall 2 presses the upper end of the coil spring 55, the telescopic rod 51 advances, and the vehicle height rises. At this time, since the spring length of the coil spring 55 is pressed without changing, the vehicle height increases by the length of the extension rod 51 advanced. As the plunger 14 moves upward, the connecting portion 20 of the plunger 14 is always maintained in an upright state by the guides 5 and 5, so that the vehicle height is smoothly raised without being twisted.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, the vehicle height is adjusted by hydraulic pressure as the fluid supplied to the cylinder 1, but it may be pneumatic.

  Moreover, in the case of the said embodiment, although the cylinder 1 was comprised with the cylindrical inner wall part 2 and the outer side wall part 3, and the plunger 14 was made into the substantially bottomed cylindrical body, it is not limited to this, For example, as shown in FIG. 3, a cylinder formed in a rectangular tube shape may be arranged radially with respect to the telescopic rod 51, and a plunger having an inverted L-shaped cross section may be provided in the cylinder so as to freely advance and retract. Also, as shown in FIG. 4, a cylinder having a fan-shaped cross section is attached to the telescopic rod 51 as a single unit, and a plunger having a side cross-section having an inverted L shape and a fan shape in plan view is freely movable back and forth. You may make it provide in. In short, it is sufficient that the vehicle height can be raised smoothly by pushing up the plunger.

  Further, in the case of the above embodiment, the reciprocating path R of the plunger 14 is provided concentrically with the inner wall portion 2 and the outer wall portion 3, and the lower end opening portion by the inner wall portion 2 and the outer wall portion 3 is the lid body 10. The end surface of the bottomed cylindrical body is drilled with a drill, an end mill is inserted into the hole, and the end mill is moved in the circumferential direction starting from the hole. The reciprocating path R of the plunger 14 may be formed.

  Further, in the case of the above embodiment, the vehicle height cylinder 1 and the plunger 14 are provided so as to cover the outer periphery of the coil spring 55. However, as shown in FIG. The plunger 14 may be moved forward with the bottom portion of the bottomed cylindrical body of the cylinder 1 facing downward, and as shown in FIG. 5B, the bottom portion is on the upper side (the tip end side of the telescopic rod 51). The plunger 14 may be moved forward. However, in this case, in order to fix the cylinder 1 to the telescopic rod 51, it is necessary to change the shape of the plunger 14 correspondingly.

  Further, it is possible to provide a vehicle height adjustment suspension device in which the shock absorber S is added to the vehicle height adjustment unit described in the above embodiment.

The perspective sectional view showing the vehicle height adjustment unit according to the present invention. The perspective sectional view showing the state where fluid was supplied. The schematic plan view which showed the modification which arrange | positioned the cylinder of the planar view rectangular shape radially with respect to the expansion-contraction rod. The schematic top view which attached the cylinder of planar view fan shape with respect to the expansion-contraction rod alone. (A) is a schematic diagram in which the outer wall portion of the cylinder is brought into contact with the coil spring, and the tip end portion of the plunger is connected and fixed to the expansion / contraction rod, and (b) is a connection and fixing of the outer wall portion of the cylinder to the expansion / contraction rod, The schematic diagram which made the front-end | tip part contact | abut to the coil spring. Sectional drawing which shows the conventional vehicle height adjustment unit. Sectional drawing which showed the state with which the fluid was supplied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Inner wall part, 2a ... Flange, 2c, 3c ... Notch, 3 ... Outer wall part, 3a ... Fluid supply port, 4 ... Bottomed cylindrical body, 5 ... Guide, 5a ... Horizontal support part DESCRIPTION OF SYMBOLS 5b ... Upright support part, 6 ... Holding plate, 10 ... Cover body, 10a ... Contact part, 10b ... Female screw, 11 ... O-ring, 12 ... Groove, 14 ... Plunger, 15 ... Cylindrical part, 16 ... Tip part (Sliding portion), 17 ... through hole, 18 ... adapter, 19 ... fixing portion, 20 ... connecting portion, 21 ... wear ring, 22 ... first insertion groove, 23 ... second insertion groove, 24 ... fluid supply path, DESCRIPTION OF SYMBOLS 50 ... Cylinder, 51 ... Telescopic rod, 52 ... Screw part, 55 ... Coil spring, 56 ... Spring cradle, 60 ... Cylinder, 61 ... Contact part, 61a ... Groove, 62 ... Covering part, 63 ... Lower end opening part, 70 ... Plunger, 71 ... Rod side sliding part, 71a ... Groove, 72 ... Covering part, 73 ... Linda side sliding portion, 74 ... stopper, 80 ... fluid pressure chamber, 80a ... upper space, 80b ... side space, A ... vehicle body, N ... nut, P ... packing, R ... reciprocating path, Ra ... fluid pressure chamber , S ... Shock absorber

Claims (5)

  A cylinder and a shock absorber having a telescopic rod whose tip is connected to the vehicle body, and a lower end supported by a spring cradle attached to the shock absorber. A vehicle height adjustment unit that is attached to a suspension device that has a coil spring that is externally fitted to a rod and that adjusts the vehicle height by moving the telescopic rod back and forth to form an internal space through which fluid flows in and out. And a plunger inserted in the internal space, the cylinder including an inner wall portion opposed to the outside of the coil spring, and an outer wall portion provided at a distance from the inner wall portion. In addition, the fluid pressure chamber is formed between the inner wall portion and the outer wall portion, and the plunger is provided so as to freely advance and retract in the axial direction of the coil spring. Further, the vehicle height adjustment is characterized in that either the cylinder or the plunger is connected and fixed to the telescopic rod, and the other is in contact with the coil spring so that the telescopic rod can be advanced and retracted. unit.   The inner wall portion is formed in a cylindrical shape so as to cover the coil spring, and the outer wall portion is formed in a cylindrical shape concentrically with the inner wall portion, and is an open end formed between the both side wall portions. An annular lid is provided so as to airtightly seal the plunger, and the plunger is inserted between the side walls and slides on the inner surfaces of the side walls, and the sliding A cylindrical part having a connecting part connected to the part and a fixing part that is closed to one end and fixed to the telescopic rod are formed, and the cylinder has a flange in contact with the annular part of the coil spring at the tip part in the radial direction The vehicle height adjustment unit according to claim 1, wherein the vehicle height adjustment unit is provided so as to project from the vehicle.   The vehicle height adjusting unit according to claim 1 or 2, wherein a pair of guides for guiding the forward and backward movement of the plunger are provided on the inner wall portion and the outer wall portion.   The vehicle height adjusting unit according to any one of claims 1 to 3, wherein a wear ring is fitted to the sliding portion of the plunger.   A vehicle height adjustment suspension apparatus, wherein the vehicle height adjustment unit according to any one of claims 1 to 4 is attached to the suspension apparatus.

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