JP3832779B2 - Vehicle height adjustment device and vehicle height adjustment system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle height adjusting device and a vehicle height adjusting system that are used to adjust the vehicle height of a vehicle in three stages of high, medium, and low.
[0002]
[Prior art]
As a conventional vehicle height adjustment device and vehicle height adjustment system, for example, there is one described in Japanese Patent Application Laid-Open No. 62-231810. FIG. 7 is a sectional view showing such a conventional vehicle height adjustment device. An upper piston 2 that slides in the upper cylinder 1, a lower cylinder 10 that has a cylindrical upper end connected to the lower end of the upper piston 2, and a lower portion that slides in a cylinder hole formed in the lower portion of the lower cylinder 10 The upper cylinder 1 and the upper piston 2 constitute an upper jack, and the lower cylinder 10 and the lower piston 13 are provided with a piston 13 and a cylindrical member 15 that attaches the lower piston 13 to the bottom of the cover 20. Constitutes the lower jack. Incidentally, 26 and 27 are hydraulic oil supply oil chambers provided on the upper portions of the upper piston 2 and the lower piston 13.
[0003]
FIG. 8 shows a conventional vehicle height adjusting system, which has a vehicle height adjusting device as shown in FIG. 7 on the front side and rear side of the wheel. On the other hand, hydraulic oil is supplied and discharged via solenoid valves 31 and 32, and the hydraulic oil in the oil chambers 26 and 27 is returned to the tank 34 via the solenoid valve 33.
[0004]
Reference numeral 35 denotes a pump driven by a motor 36, which can supply hydraulic oil to the oil chambers 26 and 27 via the solenoid valves 31 and 32. Reference numeral 37 denotes a vehicle height adjustment selection switch. The control device 38 controls the operation of the motor 36 and the solenoid valves 31, 32, 33 based on the detection output of the pressure detection switch 39 of the pump 35 and the vehicle speed sensor 40.
[0005]
In such a vehicle height adjustment system, when the vehicle height is switched from low to medium, the solenoid valve 31 is turned on simultaneously with the operation of the pump 35 by the motor 36, and the oil chamber 26 is connected to the oil chamber 26 via the solenoid valve 31. The hydraulic oil is supplied to raise the vehicle height.
[0006]
On the other hand, when lowering the vehicle height from medium to low, both the solenoid valve 31 and the solenoid valve 33 are turned on, whereby the hydraulic oil in the oil chamber 26 is tanked via the solenoids 31 and 33. Since it is discharged to 34, the vehicle height can be lowered.
[0007]
When the vehicle height is changed from medium to high, the pump 35 is operated in the middle position of the vehicle height and the solenoid valve 32 is switched on, whereby the oil chamber 27 is connected via the solenoid valve 32. The hydraulic oil from the pump 35 is supplied and the vehicle height rises to a high position.
[0008]
On the other hand, when the vehicle height is changed from high to medium, the solenoid valves 32 and 33 are simultaneously turned on, whereby the hydraulic oil in the oil chamber 27 is discharged to the tank 34 via these solenoid valves 32 and 33. The vehicle height will drop to the middle position.
[0009]
[Problems to be solved by the invention]
However, in such a conventional vehicle height adjusting device and vehicle height adjusting system, the upper jack and the lower jack have a two-stage configuration in series, and an attachment portion for connecting the upper and lower sides of each jack is necessary. As a result, the axial length becomes longer, and the bending moment acting on the jack bearing becomes larger, and a sufficient length of bearing and a strong connection between each jack are required. However, there is a problem that it may become difficult to arrange the vehicle on the vehicle.
[0010]
Also, in order to switch the vehicle height between three levels, low, medium and high, each uses independent upper and lower jacks, for their combination or for mounting them on the vehicle, In addition, there is a problem that it is necessary to use two components such as a seal member and a stopper.
[0011]
Furthermore, since the upper piston 2 and the lower piston 13 are exposed to the outside, it is necessary to provide a surface treatment layer such as hard chrome plating from the viewpoint of environmental resistance. Therefore, there is a problem in that the product cost increases as a whole. It was.
[0012]
Also, in order to operate the two jacks independently, the hydraulic circuit must also be independent of each other. This prevents the hydraulic oil from wrapping around between the front, rear, left and right jacks due to fluctuations in the vehicle weight during travel. In order to eliminate the tilt of the jack, it is not possible to use the jack to be operated in the middle, it is necessary to use it in the fully extended state, and as a result, the pressure of the jack part is abnormal due to expansion of the hydraulic oil due to temperature rise In order to suppress this increase, there is a problem that one relief valve for circuit pressure compensation is required for each oil passage connecting the oil chambers 26 and 27.
[0013]
The present invention solves the above-mentioned problems, and despite the fact that the required lifting stroke can be obtained, the overall axial length can be shortened, the configuration is simplified, and the use of components It is an object of the present invention to obtain a vehicle height adjusting device and a vehicle height adjusting system that can reduce the number and prevent the exposure of sliding members and the like to the outside and improve environmental resistance at low cost.
[0014]
[Means for Solving the Problems]
  In order to achieve the above object, a vehicle height adjustment device according to the invention of claim 1 is attached to the vehicle body side.And the lower part was releasedAn inner cylinder, a piston block movably inserted into the inner cylinder, a first oil chamber defined by the piston block in the inner cylinder, and movable to the outer peripheral side of the inner cylinderAn outer cylinder connected to an upper spring seat that supports the suspension spring, and a second oil chamber defined between the piston block, the inner cylinder, and the outer cylinder so as to face the first oil chamber. The pressure oil is supplied to or discharged from the first oil chamber to raise or lower the inner cylinder, and the pressure oil is also supplied to or discharged from the second oil chamber to further raise or lower the inner cylinder with the piston block. It is characterized by making it.
[0015]
According to a second aspect of the present invention, the vehicle height adjusting device is configured such that the first oil chamber is connected to a hydraulic pressure supply pump and a tank through an oil passage provided in a piston rod of the shock absorber.
[0016]
  The vehicle height adjustment system according to the invention of claim 3It consists of a vehicle height adjustment device and a hydraulic circuit that supplies and discharges pressure oil to and from the vehicle height adjustment device. The vehicle height adjustment device is attached to the vehicle body side, and the lower side is released and the inner cylinder is moved into the inner cylinder. A freely inserted piston block, a first oil chamber defined by the piston block in the inner cylinder, and an outer connected to an upper spring seat that is movably provided on the outer peripheral side of the inner cylinder and supports a suspension spring A cylinder block, and a piston block, and a second oil chamber defined between the inner cylinder and the outer cylinder so as to face the first oil chamber, and the hydraulic circuit pumps the first oil chamber A first circuit connected to the second circuit, a second circuit connecting the second oil chamber to the pump, and a middle part of the first circuit. A first solenoid valve for communicating or blocking the first circuit; a second solenoid valve provided in the middle of the second circuit for communicating or blocking the second circuit; A third circuit branched from the second circuit and connected to the tank; a third solenoid valve provided in the middle of the third circuit for communicating or blocking the third circuit; and a vehicle height selection switch A control device for selectively opening / closing one of the first solenoid valve, the second solenoid valve, and the third solenoid valve according to an operation or a hydraulic pressure in the first and second oil chambers, While selectively opening and closing the first, second, and third solenoid valves, pressure oil is supplied to and discharged from the first oil chamber to raise or lower the inner cylinder, and pressure oil is also supplied to the second oil chamber. And the inner cylinder is further lifted or lowered together with the piston block. Is shall.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.1 and 2Is the vehicle height adjustment device of the present invention.This is shown by an inner cylinder 106 attached to the vehicle body side 103 and opened downward, a piston block 112 inserted movably in the inner cylinder 106, and a piston block 112 in the inner cylinder 106. A first oil chamber 119, an outer cylinder 121 that is movably provided on the outer peripheral side of the inner cylinder 106 and that is linked to an upper spring seat 102 that supports the suspension spring 101, a piston block 112, an inner cylinder 106, and an outer cylinder 121, and a second oil chamber 131 that is partitioned to face the first oil chamber 119, and pressure oil is supplied to and discharged from the first oil chamber 119 to raise or lower the inner cylinder 106. Similarly, supply and discharge pressure oil to the second oil chamber 131. It is intended to further lift or lower the inner cylinder 106 with the piston block 112.
  Furthermore, the vehicle height adjustment system of the present invention comprises the vehicle height adjustment device and a hydraulic circuit for supplying and discharging pressure oil to the vehicle height adjustment.
  As shown in FIG. 2, the hydraulic circuit includes a first circuit A that connects the first oil chamber 119 to the pump 151, and a second circuit that similarly connects the second oil chamber 131 to the pump 151. B, a first electromagnetic valve 155 that is provided in the middle of the first circuit A and communicates or blocks the first circuit A, and a second electromagnetic circuit that is provided in the middle of the second circuit B. A second solenoid valve 156 for communicating or blocking B, a third circuit C branched from the first and second circuits A and B and connected to the tank 153, and the third circuit C in the middle A third electromagnetic valve 157 which is provided and communicates with or cuts off the third circuit C; and the first electromagnetic valve according to the operation of the vehicle height selection switch or the hydraulic pressure in the first and second oil chambers 119 and 131. One of the valve 155, the second solenoid valve 156 and the third solenoid valve 157 is selectively opened. And a control unit 164 for controlling. As a result, pressure oil is supplied to and discharged from the first oil chamber 119 and the inner cylinder 106 is lifted or lowered while selectively opening and closing the first, second, and third solenoid valves 155, 156, and 157. Similarly, pressure oil is supplied to and discharged from the second oil chamber 131, and the inner cylinder 106 is further lifted or lowered together with the piston block 112.
  This will be described in more detail below.
  Reference numeral 104 denotes a head cover attached to the vehicle body 103, and a central portion thereof is narrowed to provide a hole 105.
[0018]
Further, the upper end of the inner cylinder 106 is fixed around the hole portion 105 by welding or the like, and a closing plate 107 is fitted and fixed in the middle of the inner cylinder 106. Is provided with an O-ring 108 for ensuring sealing performance with the inner periphery of the inner cylinder 106.
[0019]
An oil hole 109 is formed in the central portion of the clogging plate 107 so as to penetrate therethrough. The oil hole 109 communicates with an oil hole 111 of a connecting member 110 that is connected to the outer side surface (upper side surface) of the capping plate 107. These oil holes 111 and 109 are connectable to a circuit A described later.
[0020]
Reference numeral 112 denotes a piston block having a piston 113 movably inserted into the inner cylinder 106. The piston block 112 has a piston 113 that slides on the inner periphery of the inner cylinder 106. A recess 114 having a predetermined pressure receiving surface is provided at the upper center, and an oil hole 115 is provided to connect the recess 114 and the outer periphery of the piston block 112.
[0021]
Further, 116 is a support member attached to the lower end portion of the inner cylinder 106, and an O-ring 117 and a metal ring 118 are respectively provided on the surfaces facing the outer peripheral side of the piston block 112 and the inner peripheral side of the outer cylinder described later. The O-ring 117 can be slidably contacted with the piston block 112, and the metal ring 118 is passed through a minute gap (not shown) formed by a fitting gap of the metal ring 118 on the inner periphery of the outer cylinder. Are in sliding contact.
[0022]
The piston block 112 defines two oil chambers 119 and 120 communicating with each other through the oil hole 115 in the inner cylinder 106, and these oil chambers 119 and 120 form a first oil chamber. Yes.
[0023]
On the other hand, 121 is an outer cylinder that is slidably provided on the outer peripheral side of the inner cylinder 106 via a gap 122. The upper part of the outer cylinder 121 is in oil-tight sliding contact with the outer periphery of the inner cylinder 106. A sealing material 124 and a backup ring 133 are attached. Reference numeral 123 denotes a bearing member of the inner cylinder 106.
[0024]
Further, a closing plate 125 that closes the outer cylinder 121 is fixed by welding or the like to the lower end of the opening of the outer cylinder 121. The lower surface of the piston block 112 is supported on the upper surface of the closing plate 125 so as to be detachable. A cushion material 126 is coupled to the lower surface of the closing plate 125 by bolts 127.
[0025]
Reference numeral 102 denotes the upper spring seat that supports the spring 101 with the axle (not shown) via the holding member 128.
[0026]
Reference numeral 129 denotes a connecting member fixed to the outer peripheral surface of the inner cylinder 106 and having an oil hole 130 connected to a circuit B described later. The oil hole 130 is provided between the inner cylinder 106 and the outer cylinder 121. One end communicates with the gap 122.
[0027]
131 is a second oil chamber as an oil chamber defined by the outer cylinder 121, the piston block 112 and the closing plate 125, which communicates with the gap 122 and the oil hole 130 through the joint gap of the metal ring 118. Yes.
[0028]
FIG. 2 is a hydraulic circuit diagram showing a vehicle height adjustment system configured by connecting a hydraulic circuit to a vehicle height adjustment device, in which 151 is a pump driven by a motor 152, and this pump 151 is The hydraulic oil in the tank 153 is supplied to the oil holes 111 and 109 and the oil chamber 119 of the vehicle height adjusting device through the circuit A via the check valve 154 and the first electromagnetic valve 155, and the check valve 154 and the second solenoid valve 155 are supplied. The oil is supplied to the oil hole 130, the gap 122 and the oil chamber 131 of the vehicle height adjusting device through the circuit B through the electromagnetic valve 156.
[0029]
Reference numeral 157 denotes a third electromagnetic valve connected via a throttle 158 between an oil passage 159 connecting the check valve 154 and the electromagnetic valves 155 and 156 and the tank 153.
[0030]
  Furthermore, 161 is a circuit B andTank 153The operation check valve 160 is connected between the first solenoid valve 155 and the oil hole 109, and is a relief valve connected between the circuit 153 and the tank 153.
[0031]
Reference numerals 162 and 163 denote pressure detection switches for detecting two types of hydraulic pressure in the oil passage 159. Reference numeral 164 denotes a vehicle height selection signal for vehicle heights L (low), N (medium), and H (high). The operation of the motor 152, the first solenoid valve 155, the second solenoid valve 156, and the third solenoid valve 157, using the vehicle speed signal from the vehicle speed sensor and the detected pressure signal from the pressure detection switches 162, 163 as input signals, respectively. It is a control apparatus which controls.
[0032]
The vehicle height adjusting device S as shown in FIG. 1 is provided on the left and right front wheel sides and rear wheel sides of the vehicle, and is connected as shown in FIG.
[0033]
Next, the operation will be described. In the present invention, the vehicle height is raised and lowered by selection input of the vehicle height L (low), N (medium), and H (high) by the vehicle height selection switch.
[0034]
(I) Adjust vehicle height from L to N
First, the motor 152 and the first electromagnetic valve 155 are energized under the control of the control device 164. As a result, the pump 151 is operated, and the pump hydraulic pressure (hydraulic oil) is sent to the oil chamber 119 and the oil chamber 120 in the inner cylinder 106 constituting the vehicle height adjusting device S via the circuit A.
[0035]
As a result, a pressure corresponding to the weight of the vehicle body is generated in the oil chamber 119, and the piston block 112 is pushed down from the state shown in FIG. 3A, and the vehicle body 103 is shown in FIG. Accordingly, the outer cylinder 121 is lowered, and the head cover 104, that is, the vehicle body is relatively lifted. By this lifting, the piston 113 stops at a position where it hits the stopper 135.
[0036]
In addition, the piston 113 is further stopped to further increase the pressure in the oil chamber 119. This pressure is detected by the high pressure detection pressure switch 162. Upon receiving this detection output, the control device 164 The energization to the first solenoid valve 155 is stopped.
[0037]
For this reason, the two solenoid valves 155 and 156 are both turned off, and the vehicle height is held at the position N by the check action.
[0038]
  During the lowering operation of the outer cylinder 121, it is necessary to replenish hydraulic oil to the oil chamber 131, but the operation check valve 161 isUnder the pressure of the high-pressure oil chamber 119It is opened, and hydraulic oil is supplied into the oil chamber 131 through this operation check valve 161.
[0039]
(B) Adjust vehicle height from N to L
In this case, when both the first solenoid valve 155 and the third solenoid valve 157 are energized, the hydraulic oil in the oil chamber 119 is supplied to the oil holes 109 and 111, the circuit A, and the first solenoid valve 155. , The throttle 158 and the third electromagnetic valve 157 are returned to the tank 153, respectively.
[0040]
Thus, the pressure in the oil chamber 119 disappears when the piston 113 and the lower surface of the closing plate 107 are in contact with each other. At this time, the pressure is detected by the pressure switch 163 for detecting low pressure, and based on this detection output, The control device 164 simultaneously stops energization of the electromagnetic valves 155 and 157.
[0041]
For this reason, the vehicle height stops at the position L as shown in FIG.
[0042]
It should be noted that in the ascending process of the piston block 112 in which the piston 113 comes into contact with the lower surface of the closing plate 107, the volume of the oil chamber 131 decreases, and at this time, the hydraulic oil in the oil chamber 131 needs to be released to the outside.
[0043]
At this time, the operation check valve 161 is opened because the pressure when the vehicle body descends is acting, and the hydraulic oil in the oil chamber 131 is passed through the operation check valve 161 through the gap 122 and the oil hole 130. , Function to return to the tank 153 through the circuit B.
[0044]
(C) Adjust vehicle height from N to H
In this case, both the motor 152 and the second electromagnetic valve 156 are energized in the state (a).
[0045]
As a result, the hydraulic pressure from the pump 151 is sent into the oil chamber 131 via the circuit B via the oil hole 130 of the vehicle height adjusting device, the gap 122, and the joint gap of the metal ring 118, thereby further lifting the vehicle body.
[0046]
  Here, in the oil chamber 119pistonSince the pressure receiving area 113 is smaller than the pressure receiving area of the closing plate 125, the pressure of the oil chamber 119 when lifting the vehicle body is higher than the pressure of the oil chamber 131 described above.
[0047]
  Therefore, the operation check valve 161By setting the operating pressure between the operating pressure of the outer cylinder 121 and the cylinder block 112, thisOperate check valve when adjusting vehicle height from N to H161Is set not to open.
[0048]
  Therefore, the discharge pressure of the hydraulic oil of the pump 151 is the operation check valve.161The vehicle body can be further lifted as shown in FIG. 3C without passing through the tank 153.
[0049]
Thus, when raising the vehicle height from N to H, the stopper 136 provided on the outer cylinder 121 hits the upper edge of the support member 116, so that the pressure in the oil chamber 131 and the circuit B increases. The control device 164 stops energization of the motor 152 and the second electromagnetic valve 156 based on the detection output.
[0050]
For this reason, the vehicle height is held at the H position by the check action of the second electromagnetic valve 156.
[0051]
(D) Adjust vehicle height from H to N
In this case, the second solenoid valve 156 and the third solenoid valve 157 are energized, whereby the hydraulic oil in the oil chamber 131 is returned to the tank 153 via the gap 122, the oil hole 130, and the circuit B. It is. At this time, the diaphragm 158 restricts the rapid upward movement of the outer cylinder 121 to avoid destabilization of the vehicle body.
[0052]
Thus, when the upper end of the closing plate 125 contacts the lower surface of the piston block 122 as shown in FIG. 3B, the pressure in the oil chamber 131 disappears, and this is detected by the pressure detection switch 163 and controlled. The device 164 stops energization of the second solenoid valve 156 and the third solenoid valve 157.
[0053]
At this time, the oil chamber 119 is maintained at a pressure by the check action of the first electromagnetic valve 155.
[0054]
For this reason, the piston block 112 does not rise in the inner cylinder 106, and therefore the vehicle height does not drop below N, and both the first solenoid valve 155 and the second solenoid valve 156 are checked. Thus, the vehicle height is stably held at the N position.
[0055]
(E) Adjust vehicle height from L to H
In this case, the vehicle height may be increased from L to N and N to H in the order as described above. At this time, by energizing the motor 152 and the first electromagnetic valve 155, It is also possible to raise the vehicle height from L to H at a time.
[0056]
(F) Adjust vehicle height from H to L
In this case, it is only necessary to lower the vehicle height from H to N and from N to L according to the procedure described above. In this case, the solenoid valves 155, 156, and 157 are energized simultaneously to It is possible to lower the height to L at once.
[0057]
The relief valve 160 protects the motor 152 in the event of a failure of the pressure detection switches 162, 163, etc., and suppresses an abnormal increase in the pressure in the hydraulic circuit due to a temperature rise in each vehicle height holding state. That is, the relief valve 160 defines the upper limit of the circuit pressure.
[0058]
In this embodiment, since the oil holes 111 and 130 connected to the circuits A and B are gathered above the apparatus, piping work for these is facilitated.
[0059]
FIG. 4 shows the vehicle height adjustment operation corresponding to each operation state of the motor 152, the electromagnetic valves 155, 156, 157, the operation check valve 161, the pressure detection switches 162, 163 in the vehicle height adjustment system shown in FIG. It is explanatory drawing.
[0060]
FIG. 5 shows another embodiment of the present invention, which is basically different from the vehicle height adjusting device shown in FIG. 1 in that a vehicle height adjusting device is formed on the upper portion of the shock absorber 170. FIG. In particular, a center hole 172 as an oil passage formed in the piston rod 171 of the shock absorber 170 is communicated with the oil chamber 119 and the circuit A constituting the first oil chamber.
[0061]
Therefore, one end (lower end) of the center hole 172 opens to the outer periphery of the piston rod 171 near the center thereof and communicates with the oil chamber 119, and the other end (upper end) of the center hole 172 communicates with the circuit A. ing.
[0062]
The inner cylinder 106A in this embodiment integrally has a partition plate 173 at the center, and the piston rod 171 passes through the centers of the partition plate 173, the piston block 112, and the closing plate 125, and these partition plates 173, piston block 112, the closing plate 125, and the piston rod 171 are provided with sealing materials 174, 175, 176, and 177, respectively.
[0063]
A rubber bush 179 is installed on the upper portion of the partition plate 173 via a collar 178 that wraps the outer periphery of the piston rod 171 and determines a mounting size of a rubber bush described later. Further, the head cover 104 is mounted on the rubber bush 179. Further, a rubber bush 180 is attached.
[0064]
The rubber bush 180 is fixed on the head cover 104 by a nut member 181 screwed into the outer periphery of the upper end portion of the piston rod 171, so that the upper end portion of the piston rod 171 can swing with respect to the head cover 104. It can be elastically supported.
[0065]
Reference numeral 126A denotes a cushioning material that is attached to the piston rod 171 and prevents the closing plate 125 from colliding with the upper end of the shock absorber 170. Reference numeral 182 covers the cushioning material 126A and a part of the piston rod 171. This is a dustproof cover, which is held at the lower end of a perforated cup-shaped holding member 183 fixed to the lower ends of the upper spring seat 102 and the closing plate 125.
[0066]
In this embodiment, when the vehicle height is adjusted from L to N or from N to L, the hydraulic oil from the pump 151 is centered in the first electromagnetic valve 155, the circuit A, and the piston rod 171. The oil is introduced into the oil chamber 119 through the hole 172, or the working oil in the oil chamber 119 is discharged from the tank through the center hole 172, the circuit A, the first electromagnetic valve 155, and the third electromagnetic valve 157, respectively. Or
[0067]
The configuration of the other vehicle height adjusting devices is the same as that described with reference to FIG. 1, and the adjustment between the vehicle heights L, N, and H is as shown in FIG. This embodiment is characterized in that a center hole 172 provided in the piston rod 171 is a passage connecting the circuit A and the oil chamber 119.
[0068]
【The invention's effect】
  As aboveAccording to the vehicle height adjusting device according to the invention of each claim,Attached to the car bodyAnd the lower part was releasedAn inner cylinder, a piston block movably inserted into the inner cylinder, a first oil chamber defined by the piston block in the inner cylinder, and movable to the outer peripheral side of the inner cylinderAn outer cylinder connected to an upper spring seat that supports the suspension spring, and a second oil chamber defined between the piston block, the inner cylinder, and the outer cylinder so as to face the first oil chamber. The pressure oil is supplied to or discharged from the first oil chamber to raise or lower the inner cylinder, and the pressure oil is supplied to or discharged from the second oil chamber to simultaneously raise or lower the inner cylinder and the piston block. Since the,The piston block can be stored in the inner cylinder, and the inner cylinder can be stored in the outer cylinder. This makes it possible to obtain a sufficient lifting stroke for adjusting the vehicle height. Therefore, the overall axial length can be shortened, the configuration can be simplified and the number of components used can be reduced, and the environment resistance can be improved by preventing the sliding members from being exposed to the outside. In addition, since the hydraulic oil supply port can be arranged at the upper part of the system, it is possible to easily install the pipes connected thereto.
[0069]
Further, according to the present invention, the first oil chamber is connected to the pump and tank for supplying hydraulic pressure through the oil passage provided in the piston rod of the shock absorber. Can be arranged in series, and at this time, the piston rod can be effectively used as a supply oil passage for hydraulic oil to the oil chamber.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a vehicle height adjusting device according to an embodiment of the present invention.
FIG. 2 is a hydraulic circuit diagram showing a vehicle height adjustment system according to an embodiment of the present invention.
FIG. 3 is an explanatory view showing a change state of the operation of the vehicle height adjusting device in FIG. 1;
4 is an explanatory diagram showing an operation state according to a vehicle height level of each part of the vehicle height adjustment system in FIG. 2. FIG.
FIG. 5 is a sectional view showing a vehicle height adjusting device according to another embodiment of the present invention.
6 is an explanatory view showing a change state of the operation of the vehicle height adjusting device shown in FIG. 4; FIG.
FIG. 7 is a cross-sectional view showing a conventional vehicle height adjusting device.
FIG. 8 is a hydraulic circuit diagram showing a conventional vehicle height adjustment system.
[Explanation of symbols]
103 body
106 Inner cylinder
112 Piston block
113 piston
119 Oil chamber (first oil chamber)
120 Oil chamber (first oil chamber)
121 Outer cylinder
131 Second oil chamber
151 pump
153 tank
154 Check valve
155 First solenoid valve
156 Second solenoid valve
157 Third solenoid valve
160 Relief valve
161 Operate check valve
164 Controller
170 Shock absorber
171 Piston rod
172 Center hole (oil passage)

Claims (3)

An inner cylinder lower is released with mounting et al is to the vehicle body, a piston block inserted movably within the inner cylinder, a first oil chamber partitioned by the piston block into the inner cylinder, the inner cylinder The outer cylinder connected to the upper spring seat that supports the suspension spring and the piston block, the inner cylinder, and the outer cylinder are partitioned to face the first oil chamber. It consists of a second oil chamber. Supply and discharge pressure oil to the first oil chamber and lift or lower the inner cylinder. Similarly, supply and discharge pressure oil to the second oil chamber and connect the inner cylinder to the piston block. Further , the vehicle height adjusting device is further lifted or lowered . 2. The vehicle height adjusting device according to claim 1, wherein the first oil chamber is connected to a hydraulic pressure supply pump and a tank through an oil passage provided in a piston rod of the shock absorber. It consists of a vehicle height adjustment device and a hydraulic circuit that supplies and discharges pressure oil to and from the vehicle height adjustment device. The vehicle height adjustment device is attached to the vehicle body side, and the lower side is released and the inner cylinder is moved into the inner cylinder. A freely inserted piston block, a first oil chamber defined by the piston block in the inner cylinder, and an outer connected to an upper spring seat that is movably provided on the outer peripheral side of the inner cylinder and supports a suspension spring A cylinder block, and a piston block, and a second oil chamber defined between the inner cylinder and the outer cylinder so as to face the first oil chamber, and the hydraulic circuit pumps the first oil chamber A first circuit connected to the second circuit, a second circuit connecting the second oil chamber to the pump, and a middle part of the first circuit. A first solenoid valve for communicating or blocking the first circuit; a second solenoid valve provided in the middle of the second circuit for communicating or blocking the second circuit; A third circuit branched from the second circuit and connected to the tank; a third solenoid valve provided in the middle of the third circuit for communicating or blocking the third circuit; and a vehicle height selection switch A control device for selectively opening / closing one of the first solenoid valve, the second solenoid valve, and the third solenoid valve according to an operation or a hydraulic pressure in the first and second oil chambers, While selectively opening and closing the first, second, and third solenoid valves, pressure oil is supplied to and discharged from the first oil chamber to raise or lower the inner cylinder, and pressure oil is also supplied to the second oil chamber. And the inner cylinder is further lifted or lowered together with the piston block. Vehicle height adjustment system that.

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