JP2007030665A - Suspension device - Google Patents

Abstract

A suspension device capable of adjusting the vehicle height, which can reduce the capacity of a motor that constitutes a pump required for flowing hydraulic fluid.
A suspension apparatus according to the present invention is a suspension apparatus in which an axle member 1 that rotatably supports a wheel W is connected to a vehicle body S via a shock absorber 2 and a spring 3, and the axle A first liquid chamber 4 is interposed between the member 2 and the vehicle body S in series with the spring 3, communicated with the first liquid chamber 4 via a flow path 5, and a part of the accumulator 6. A second liquid chamber 7 is provided, a pump 8 capable of bidirectional liquid feeding is provided in the flow path 5, and a working liquid is provided in the working liquid system of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7. It is characterized by providing a supply / discharge means 13 capable of supplying and discharging from the outside.
[Selection] Figure 2

Description

  The present invention relates to a suspension device capable of adjusting a vehicle height.

  As a suspension device capable of adjusting the vehicle height, conventionally, as described in Patent Document 1, as shown in FIG. 23 or FIG. 24, a piston 103 is joined to a lower end portion of a cylinder housing 102 of a shock absorber 101, and the piston 103 is liquid-tightly and slidably fitted in the additional cylinder housing 104, and an upper liquid chamber 105 and a lower liquid chamber 106, which are partitioned above and below the piston 103 in the additional cylinder housing 104, are pumped. There has been proposed an apparatus in which vehicle height adjustment is performed by allowing fluid to flow between the upper liquid chamber 105 and the lower liquid chamber 106 in fluid-tight communication with each other via 107. In FIG. 23, it is the structure which makes a hydraulic fluid flow between the upper side liquid chamber 105 and the lower side liquid chamber 106 using the switching valve 108, and in FIG. As described above, the hydraulic fluid is allowed to flow between the upper liquid chamber 105 and the lower liquid chamber 106. In any configuration, the volume of the hydraulic fluid in the upper liquid chamber 105 accompanying the vertical movement of the piston 103 is A reservoir 109 for absorbing a volume difference from the volume of the hydraulic fluid in the lower liquid chamber 106 is provided, and the hydraulic fluid in the reservoir 109 communicates with atmospheric pressure.

23 and 24, when the work amount of the pump 107 is considered, the work amount is represented by the product P × Q of the differential pressure P before and after the pump 107 and the flow rate Q discharged from the pump. In any of these configurations, since the hydraulic fluid in the reservoir 109 communicates with the atmospheric pressure, it operates up to the pressure required to move the piston 103 up and down, that is, the pressure that can support the minimum vehicle weight. There is a problem that the pressure of the liquid needs to be increased, and the work amount of the pump 107 is increased due to the large differential pressure P, and the capacity of the motor constituting the pump 107 is increased.
JP-A-5-162525

  An object of the present invention is to solve the above-described problems of the prior art, and the object of the present invention is to reduce the capacity of a motor that constitutes a pump necessary for flowing a working fluid. An object of the present invention is to provide a suspension device capable of adjusting the vehicle height that can be made small.

The suspension device according to claim 1 is a suspension device in which an axle member that rotatably supports a wheel is connected to a vehicle body via a shock absorber and a spring,
Between the axle member and the vehicle body, a first liquid chamber is interposed in series with the spring,
While communicating with the first liquid chamber via a flow path, a second liquid chamber forming a part of an accumulator is provided,
A pump capable of bidirectional liquid feeding is provided in the flow path,
The hydraulic fluid system of the first liquid chamber, the flow path, and the second liquid chamber is provided with supply / discharge means capable of supplying and discharging hydraulic fluid from the outside.

The suspension device according to claim 2 is a suspension device in which an axle member that rotatably supports a wheel is connected to a vehicle body via a shock absorber and a spring,
Between the axle member and the vehicle body, a first liquid chamber is interposed in series with the spring,
While communicating with the first liquid chamber via a flow path, a second liquid chamber forming a part of an accumulator is provided,
A pump capable of bidirectional liquid feeding is provided in the flow path,
The gas chamber of the accumulator is provided with supply / discharge means capable of supplying and discharging gas from the outside.

  According to the suspension apparatus according to claim 1 and claim 2, the second liquid chamber corresponding to the reservoir in the conventional configuration shown in FIGS. 23 and 24 is a liquid chamber forming a part of the accumulator, so that the vehicle weight is supported. The pressure required to do this can be pre-biased to the hydraulic fluid by an accumulator, thereby eliminating the need for boosting the hydraulic fluid from atmospheric pressure to the pressure required to support the vehicle weight, The work of the pump can be greatly reduced and the capacity of the motor constituting the pump can be reduced.

  In addition, in the suspension device according to claim 1, the mass of the vehicle is provided by providing supply / discharge means capable of supplying and discharging hydraulic fluid from the outside in any of the first liquid chamber, the flow path, and the second liquid chamber. Due to changes and accumulator temperature changes (the balance stroke value becomes lower than the median when the mass increases or the temperature decreases. The balance stroke value becomes higher than the median when the mass decreases or the temperature rises) Even if the balance stroke value of the liquid chamber deviates from the median value, if the balance stroke value is higher than the median value by the supply / discharge means, the hydraulic fluid is discharged to lower the balance stroke value, and the balance stroke value is less than the median value. If it is lower, increase the balance stroke value by supplying hydraulic fluid and adjust the balance stroke value of the first fluid chamber to the median value. Accordingly, when the pump is driven and hydraulic fluid flows between the first liquid chamber and the second liquid chamber to control the ride comfort of the vehicle, the extension of the first liquid chamber can be achieved. Both the side stroke and the contraction side stroke can be sufficiently secured.

  Similarly, in the suspension device according to claim 2, the first liquid chamber can be provided by changing the mass of the vehicle and the temperature of the accumulator by providing supply / discharge means capable of supplying and discharging gas from the outside in the gas chamber of the accumulator. Even if the balance stroke value is deviated from the median value, if the balance stroke value is higher than the median value by the supply / discharge means, gas is discharged from the gas chamber of the accumulator to lower the balance stroke value, and the balance stroke value is If it is lower than the value, the balance stroke value can be increased by supplying gas to the gas chamber of the accumulator, and the balance stroke value of the first liquid chamber can be adjusted to the median value. To drive the hydraulic fluid between the first liquid chamber and the second liquid chamber to control the ride comfort of the vehicle, Stroke chamber extension-side and compression-side of the can together sufficiently secured.

Furthermore, in the suspension device according to claim 1 or 2, adjusting the vehicle height to an arbitrary height and maintaining the height may be performed by supplying / discharging hydraulic fluid by the supply / discharge means or supplying / discharging gas. Compared to supplying and discharging hydraulic fluid to and from the first fluid chamber with a pump that can send fluid in both directions, the generation of torque under extremely low rotation of the motor is eliminated. Can be prevented, and the heat generation of the motor driving the pump can be suppressed.
In addition, Claims 3-8 show the specific structure of Claim 1 or 2, and a basic effect is as having mentioned above.

Embodiments of the present invention will be described below in detail based on the drawings.
FIG. 1 and FIG. 2 are schematic views showing a main part of a suspension device according to an embodiment of the present invention.

As shown in FIG. 1 (a), a suspension apparatus according to an embodiment of the present invention includes an axle member 1 that rotatably supports a wheel W via a shock absorber 2 and a spring 3 that extend in the vertical direction. A suspension device connected to the vehicle body S,
A first liquid chamber 4 is interposed between the axle member 1 and the vehicle body S in series with the spring 3.
A second liquid chamber 7 that communicates with the first liquid chamber 4 via the flow path 5 and forms a part of the accumulator 6 is provided.
The flow path 5 is provided with a pump 8 capable of feeding liquid in both directions.
Furthermore, although not shown here, the hydraulic fluid system of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 is provided with supply / discharge means capable of supplying and discharging hydraulic fluid from the outside.
Here, the first liquid chamber 4 is provided on the axle member 1 side, which is a member on the wheel W side, and the accumulator 6 and the pump 8 are provided on the vehicle body S side. Moreover, in order to absorb the displacement by the stroke as a suspension apparatus, the flow path 5 is partially formed with the elastic member (for example, rubber hose).

Here, the first liquid chamber 4 is configured by fitting the additional cylinder housing 10 into the cylinder housing 9 of the shock absorber 2 in a liquid-tight manner, but the form of the first liquid chamber is not limited to this. In other words, it is sufficient if it is arranged in series with the spring 3 between the axle member 1 and the vehicle body S.
The form of the pump 8 is not particularly limited, but here, a gear type is used, and 11 indicates a motor constituting the pump 8.
Further, in the accumulator 6, a gas chamber 12 is provided that serves as an air spring that biases the pressure of the hydraulic fluid in the second liquid chamber 7.

  According to this, since the second liquid chamber 7 is a liquid chamber forming a part of the accumulator 6, the pressure required to support the vehicle weight is applied to the pressure in the second liquid chamber 7 by the gas chamber 12 of the accumulator 6. The hydraulic fluid can be energized in advance, which eliminates the need for boosting the hydraulic fluid from the atmospheric pressure to the pressure required to support the vehicle weight by the pump 8, and greatly reduces the work of the pump 8. In addition, the capacity of the motor 11 constituting the pump 8 can be reduced. That is, the motor 11 that constitutes the pump 8 may have a capacity sufficient to bear work for expanding and contracting the first liquid chamber 4.

  The accumulator is a pressure accumulator which converts pressure energy of hydraulic fluid (oil etc.) into pressure energy of gas (air, nitrogen gas etc.) and stores it. In general, according to an accumulator, a predetermined pressure (for example, 10 to 20 MPa) can be applied to the oil as the hydraulic fluid, and a response delay due to the compressibility of the oil is caused by a pressure of 1.0 MPa or less. Thus, the response delay due to the compressibility of oil can be eliminated as compared with the configuration using the conventional reservoir.

  Here, as shown in FIG. 1B, the balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. Further, as shown in FIG. 1C, the balance stroke value becomes higher than the median value when the vehicle mass becomes light or the temperature of the accumulator 7 rises.

  In the state shown in FIG. 1B, when the ride value of the vehicle body is controlled by controlling the stroke value of the first liquid chamber 4 by a control means (not shown) based on the vertical acceleration of the vehicle body S, the first liquid The stroke on the contraction side of the chamber 4 is insufficient, and sufficient and stable control cannot be performed. Further, in the state shown in FIG. 1 (c), when the ride value of the vehicle body is controlled by controlling the stroke value of the first liquid chamber 4 by a control means (not shown) based on the vertical acceleration of the vehicle body S, The stroke on the extension side of the one liquid chamber 4 is insufficient, and this also makes it impossible to perform sufficient and stable control.

  The specific control content of the ride comfort control of the vehicle body is, for example, when the vertical acceleration G of the vehicle body S is detected by a G sensor (not shown) provided on the vehicle body S and the vertical acceleration G is upward, The pump 8 is contracted so that the liquid chamber 4 is contracted at a speed proportional to the upward acceleration, and when the vertical acceleration G is downward, the first liquid chamber 4 is expanded at a speed proportional to the downward acceleration. It is conceivable to control the motor 11 constituting the electronic control unit ECU as a control means.

  In order to eliminate the shortage of the expansion side or contraction side stroke of the first liquid chamber 4 when the ride comfort control of the vehicle body is performed in this way, in the suspension device according to the present invention, as shown in FIG. In the hydraulic fluid system of the one liquid chamber 4, the flow path 5, and the second liquid chamber 7 (here, in the flow path 5), supply / discharge means 13 capable of supplying and discharging the hydraulic fluid from the outside is provided.

Here, the supply / discharge means is provided with a hydraulic fluid chamber so that the hydraulic fluid system and the hydraulic fluid chamber communicate with each other via an additional pump, and the hydraulic fluid chamber and the hydraulic fluid system can be shut off. It is configured by communicating.
More specifically, as shown in FIG. 2, the supply / discharge means 13 is provided with a hydraulic fluid chamber 14 (reservoir: communicated with the atmosphere), and is discharged from the supply channel 15 communicating with the hydraulic fluid chamber 14 from the flow channel 5. The supply path 15 is provided with a one-way additional pump 17 and a check valve 18 for preventing the backflow of hydraulic fluid in the discharge direction. The discharge path 16 includes the flow path 5 and the hydraulic fluid chamber 14. A switching valve 19 capable of selecting communication and blocking is provided and configured. 2 denotes a motor for driving the additional pump 17. (Equivalent to claim 3)

According to the configuration corresponding to the third aspect, the supply means can be configured with a simple configuration. The supply / discharge operation according to this configuration will be described below.
FIG. 3 is a schematic diagram showing the main part and the supply operation of the suspension apparatus according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of supplying hydraulic fluid by the supply / discharge means will be described with reference to FIG.

The balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. When the ride comfort control of the vehicle body is performed in this state, the stroke on the contraction side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably. The hydraulic fluid is supplied by the supply / discharge means 13 to the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7.
Although not shown here, a detecting means for detecting the balance stroke value is separately provided, and the balance stroke value is output as a signal to the electronic control unit ECU. Based on the signal, the ECU adjusts the balance stroke value. Control shall be performed. This is the same in all the embodiments described below.

  First, the switching valve 19 is switched to the position shown in FIG. 3, the communication between the flow path 5 and the hydraulic fluid chamber 14 by the discharge path 16 is cut off, and the motor 20 is driven to drive the one-way additional pump 16. As indicated by an arrow in FIG. 3, the hydraulic fluid in the hydraulic fluid chamber 14 is supplied into the flow path 5 through the supply path 15. As a result, the balance stroke value of the first liquid chamber 4 is increased, and after the hydraulic fluid is sufficiently supplied and the balance stroke value is returned to the median value, the operation of the motor 20 and the additional pump 16 is stopped.

FIG. 4 is a schematic diagram showing the main part and the discharging operation of the suspension device according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of discharging the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes higher than the median value when the vehicle mass is reduced or the temperature of the accumulator 6 is increased. When the ride comfort control of the vehicle body is performed in this state, the stroke on the extension side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is discharged by the supply / discharge means 13 from the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7.

  When the switching valve 19 is switched to the position shown in FIG. 4 in a state where the additional pump 16 is stopped and the flow path 5 and the hydraulic fluid chamber 14 are communicated with each other by the discharge path 16, the flow path as shown by an arrow in FIG. The hydraulic fluid in 5 is discharged to the hydraulic fluid chamber 14 via the discharge path 16. As a result, the balance stroke value of the first liquid chamber 4 decreases, and after the hydraulic fluid is sufficiently discharged and the balance stroke value is returned to the median value, the switching valve 19 is switched to change the flow path 5 and the hydraulic fluid chamber 14. Block communication.

FIG. 5 is a schematic view showing a main part of a suspension device according to an embodiment of the present invention.
Since the configuration other than the supply / discharge means is the same as the configuration shown in FIGS. 1 and 2, the description thereof will be omitted.
In the suspension device shown in FIG. 2, a configuration in which supply / discharge means capable of supplying and discharging the hydraulic fluid to and from the hydraulic fluid system is shown. However, in the suspension device shown in FIG. 5, instead, the gas is supplied to the gas chamber of the accumulator 6. 12 is provided with supply / discharge means 21 capable of supplying and discharging. (Equivalent to claim 2)

Here, the supply / exhaust means is configured by communicating the atmosphere and the gas chamber via an additional pump, and communicating the atmosphere and the gas chamber so as to be shut off.
More specifically, the supply / discharge means 21 is provided with a supply path 22 that communicates the gas chamber 12 and the atmosphere, and the supply path 22 is located closest to the gas chamber 12 via the supply path 22 to the atmosphere. The switching valve 23 capable of blocking the communication between the gas chamber 12 and the atmosphere is provided, and the gas flows back from the gas chamber 12 to the atmosphere on the atmosphere side of the switching valve 23 of the supply path 22. A check valve 24 is provided, and a filter 25 and an additional pump 26 for supplying gas to the gas chamber 12 are provided on the atmosphere side of the check valve 24 of the supply path 22. Incidentally, reference numeral 27 in FIG. 5 denotes a motor for driving the additional pump 26. Here, the gas is air.

Also with the configuration corresponding to claim 4, the supply / discharge means can be configured with a simple configuration. The supply / discharge operation according to this configuration will be described below.
FIG. 6 is a schematic diagram showing the main part and the supply operation of the suspension apparatus according to one embodiment of the present invention shown in FIG.
Hereinafter, the gas supply operation by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. When the ride comfort control of the vehicle body is performed in this state, the stroke on the contraction side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The gas is supplied to the gas chamber 12 by the supply / discharge means 21.

  First, the switching valve 23 is switched to the position shown in FIG. 6, and then the additional pump 26 is driven by the motor 27. Thus, gas is supplied from the atmosphere to the gas chamber 12 through the supply path 22, the filter 25, the check valve 24, and the switching valve 23. When the gas is supplied to the gas chamber 12, the pressure in the gas chamber 12 rises, and the gas chamber 12 expands, so that the second liquid chamber 7 is contracted, and the internal working fluid passes through the flow path 5. The liquid is supplied to the one liquid chamber 4, whereby the balance stroke of the first liquid chamber 4 can be raised to a median value.

FIG. 7 is a schematic diagram showing the main part and the discharging operation of the suspension device according to one embodiment of the present invention shown in FIG.
Hereinafter, the gas discharge operation by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes higher than the median value when the vehicle mass is reduced or the temperature of the accumulator 6 is increased. When the ride comfort control of the vehicle body is performed in this state, the stroke on the extension side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The gas is discharged from the gas chamber 12 to the atmosphere by the supply / discharge means 21.

  When the switching valve 23 is switched to the position shown in FIG. 7, the communication of the gas chamber 12 with the atmosphere through the supply path 22 is blocked, and the gas chamber 12 can be communicated with the atmosphere through the switching valve 23. . As a result, the gas is discharged from the gas chamber 12 to the atmosphere, the pressure in the gas chamber 12 is reduced, and the gas chamber 12 contracts, so that the second liquid chamber 7 is expanded and the operation in the first liquid chamber 4 is performed. The liquid is discharged to the second liquid chamber 7 through the flow path 5, thereby reducing the balance stroke of the first liquid chamber 4 to a median value.

  Each of the supply / discharge means described above has a configuration in which an additional pump and a motor as a driving source thereof are newly provided, so that a cost is increased and a demerit that an increase in the weight of the entire vehicle occurs. The configuration that eliminates this is shown below.

FIG. 8 is a schematic view showing a main part of a suspension device according to an embodiment of the present invention.
Since the configuration other than the supply / discharge means is the same as the configuration shown in FIGS. 1 and 2, the description thereof is omitted.
In the suspension device shown in FIG. 8, the hydraulic fluid is supplied to and discharged from the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 in the same manner as that shown in FIG. The structure which provides the possible supply / discharge means 28 is shown.

Here, the supply / discharge means is provided with a hydraulic fluid chamber, and the hydraulic fluid system and the hydraulic fluid chamber communicate with each other via a supply device passively operated by the pump, and the hydraulic fluid chamber And the hydraulic fluid system in such a way that they can be shut off.
More specifically, the supply / discharge means 28 is configured as follows. A hydraulic fluid chamber 29 is provided, and the flow channel 5 located between the pump 8 and the second fluid chamber 7 and the hydraulic fluid chamber 29 are communicated with each other through the switching valve 30 and the discharge passage 31 so as to be shut off. The flow path 5 located between the liquid chamber 4 and the pump 8 and the hydraulic fluid chamber 29 communicate with each other via a supply path 32, and the supply path 32 includes a supply device 36 including a piston 33, a rod 34, and a cylinder 35. Each of the branch paths 32a, 32b, 32c, and 32d constituting the supply path 32 is provided with a check valve 37 that prevents a back flow from the flow path 5 to the hydraulic fluid chamber 29. The supply device 36 is passively operated by driving the pump 8 as described below. (Equivalent to claim 5)

  A seal 38 is provided on the outer peripheral side of the left and right rods 34 in FIG. 8, whereby supply chambers 39 a and 39 b are defined between the cylinder 35 and the rod 34. A seal 40 is provided on the outer peripheral side of the piston 33, whereby the operation chambers 41 a and 41 b are defined between the cylinder 35 and the piston 33. The flow path 5 positioned between the pump 8 and the switching valve 30 and the operation chamber 41a are communicated via the operation path 42, and the flow path 5 positioned between the switching valve 30 and the second liquid chamber 7 The operation chamber 41 b communicates with the operation path 43. Further, a centering spring 44 for centering the piston 33 is provided between the left and right ends of the rod 34 and the cylinder 35.

According to the configuration corresponding to the fifth aspect, the supply / discharge means can be configured without newly providing an additional pump and a motor for driving the additional pump. Hereinafter, the supply / discharge operation according to this configuration will be described.
9 and 10 are schematic views showing the main part and the supply operation of the suspension apparatus according to the embodiment of the present invention shown in FIG.
Hereinafter, the operation of supplying the hydraulic fluid by the supply / discharge means will be described with reference to FIGS. 9 and 10.

  The balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. When the ride comfort control of the vehicle body is performed in this state, the stroke on the contraction side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is supplied to the hydraulic fluid system of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 (here, the flow path 5) by the supply / discharge means 28.

  First, the switching valve 30 is switched to the position shown in FIGS. 9 and 10 to cut off the communication between the flow path 5 and the hydraulic fluid chamber 29 by the discharge passage 31, and between the first liquid chamber 4 and the second liquid chamber 7. When the communication through the flow path 5 is also cut off, and the motor 11 is driven to drive the bidirectional pump 8 to control the ride comfort of the vehicle body, the pump 8 enters the first liquid chamber 4 into the hydraulic fluid. 9, the working fluid in the working chamber 41 a is discharged through the working path 42, the working chamber 41 a contracts, and the working chamber 41 b expands accordingly, and the piston 33 moves to the left side in FIG. 9. Moving. Along with this, the supply chamber 39a contracts, so that the hydraulic fluid in the supply chamber 39a is supplied to the flow path 5 via the branch path 32b and the check valve 37 as the pressure rises. It is supplied to the one liquid chamber 4 to increase the balance stroke value of the first liquid chamber 4. At the same time, since the supply chamber 39b expands, the hydraulic fluid in the hydraulic fluid chamber 29 is supplied into the supply chamber 39b via the branch path 32c and the check valve 37.

In addition, when the pump 8 is discharging the working fluid from the first fluid chamber 4, the working fluid is supplied into the working chamber 41a through the working path 42, so that the working chamber 41a expands, and the working chamber is accompanying this. 41b contracts, the working fluid in the working chamber 41b is supplied to the second fluid chamber 7, and the piston 33 moves to the right in FIG. Accordingly, the supply chamber 39b contracts, so that the hydraulic fluid in the supply chamber 39b is supplied to the flow path 5 via the branch path 32d and the check valve 37 as the pressure rises. It is supplied to the one liquid chamber 4 to increase the balance stroke value of the first liquid chamber 4. At the same time, since the supply chamber 39a expands, the hydraulic fluid in the hydraulic fluid chamber 29 is supplied into the supply chamber 39a via the branch path 32a and the check valve 37.
When the bidirectional pump 8 is operated for controlling the ride comfort of the vehicle body, the above two operations are alternately repeated.

  As described above, when the ride comfort control of the vehicle body is performed in the state where the switching valve 30 is switched to the position shown in FIGS. 9 and 10, the inside of the hydraulic fluid chamber 29 is controlled regardless of the operation direction of the bidirectional pump 8. When the hydraulic fluid is supplied through the supply channel 32 into the flow path 5 and thus into the first liquid chamber 4, the balance stroke value of the first liquid chamber 4 can be increased, and when the balance stroke value becomes the median value. The switching valve 30 is returned to the position shown in FIG. 8 so that the first liquid chamber 4 and the second liquid chamber 7 communicate with each other through the flow path 5, and the operation chamber 41 a and the operation chamber 41 b are connected to the operation path 42. Then, the operation of the piston 33 of the supply device 36 is stopped by communicating through the flow path 5 and the operation path 43.

FIG. 11 is a schematic diagram showing the main part and the discharging operation of the suspension apparatus according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of discharging the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes higher than the median value when the vehicle mass is reduced or the temperature of the accumulator 6 is increased. When the ride comfort control of the vehicle body is performed in this state, the stroke on the extension side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is discharged from the hydraulic fluid system of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 (here, the flow path 5) by the supply / discharge means 28.

  When the switching valve 30 is switched to the position shown in FIG. 11 and the flow path 5 and the hydraulic fluid chamber 29 are communicated with each other by the discharge path 31, the hydraulic fluid in the flow path 5 is discharged from the discharge path 31 as shown by the arrows in FIG. Then, the fluid is discharged into the hydraulic fluid chamber 29. After the hydraulic fluid has been sufficiently discharged and the balance stroke value has been returned to the median value, the switching valve 30 is switched to the position shown in FIG. 8 and the flow path 5 and the hydraulic fluid chamber 29 are connected via the discharge path 31. Block communication.

FIG. 12 is a schematic view showing a main part of the suspension apparatus according to the embodiment of the present invention shown in FIG.
After the operation of supplying the hydraulic fluid shown in FIGS. 9 and 10 is finished, as shown in FIG. 12, when the piston 33 stops deviating from the median value, the internal operation of the supply chamber 39a and the supply chamber 39b is performed. Since the liquid acts as a back pressure against the centering spring 44, the piston 33 is not returned to the median value by the action of the centering spring 44. If the next hydraulic fluid supply operation is performed in this state, the displacement of the piston 33 from the median value becomes large, causing a problem that the stroke is used up. Therefore, the piston 33 and the rod 34 are preferably structured as follows.

FIG. 13 is a schematic diagram showing a structure of a piston and a rod of the suspension apparatus according to the embodiment of the present invention shown in FIG.
That is, a passage 45 that communicates both axial end surfaces of the rod 34 is provided, and the left and right supply chambers 39a and 39b shown in FIG. This prevents the hydraulic fluid in the supply chambers 39a and 39b from acting as a back pressure against the centering action of the centering spring 44, and the piston 33 is gently returned to the center value by the action of the centering spring 44. be able to. If the diameter of the passage 45 is too large, the hydraulic fluid supply operation itself shown in FIGS. 9 and 10 cannot be performed. Therefore, it is necessary to provide an appropriately sized throttle 46 in the middle of the passage 45.

  The suspension device corresponding to claim 5 shown in FIG. 8 is a new additional pump for returning the balance stroke value of the first liquid chamber 4 to the median value as compared with the suspension device shown in FIGS. Since there is no need to provide a motor for driving the motor, it is a more advantageous configuration from the viewpoint of suppressing an increase in cost and weight.

FIG. 14 is a schematic diagram showing a main part of a suspension device according to an embodiment of the present invention.
Since the configuration other than the supply / discharge means is the same as the configuration shown in FIGS. 1 and 2, the description thereof is omitted.
In the suspension device shown in FIG. 14, the hydraulic fluid is supplied to the hydraulic fluid system (here, the second fluid chamber 7) of the first fluid chamber 4, the flow path 5, and the second fluid chamber 7 in the same manner as that shown in FIG. The structure which provides the supply / discharge means which can be supplied / discharged is shown.

Here, the additional pump is driven by a motor that drives the pump, and a supply operation by the additional pump can be selected.
More specifically, this supply / discharge means is configured as follows. A hydraulic fluid chamber 47 is provided separately, a supply path 48 that communicates from the second fluid chamber 7 to the hydraulic fluid chamber 47 is provided, and the supply channel 48 communicates in the middle of the supply channel 48 in order from the second fluid chamber 7. A switching valve 49 and a one-way additional pump 50 are provided. The additional pump 50 is driven by the motor 11 that drives the pump 8, and the supply path 48 on the hydraulic fluid chamber 47 side of the additional pump 50 and the additional pump 50 are configured so that the supply operation of the additional pump can be selected. The supply passage 48 on the second liquid chamber 7 side is communicated with the supply passage 48 through the switching valve 49 and the bypass passage 51 so as to be shut off. (Equivalent to claim 6)

  In normal vehicle height adjustment and ride comfort control of the vehicle body, the switching valve 49 is switched to the position shown in FIG. 14, the supply path 48 on the hydraulic fluid chamber 47 side of the additional pump 50, and the second liquid chamber of the additional pump 50. The supply path 48 is connected to the 7-side supply path 48 via the switching valve 49 and the bypass path 51, and the supply path 48 is shut off before and after the switching valve 49. Even if driven in conjunction with the motor 11, the hydraulic fluid in the hydraulic fluid chamber 47 only circulates through the supply passage 48, the switching valve 49, and the bypass passage 51, and is not supplied to the second fluid chamber 7. .

FIG. 15 is a schematic view showing the main part and the supply operation of the suspension device according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of supplying the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. When the ride comfort control of the vehicle body is performed in this state, the stroke on the contraction side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is supplied to the hydraulic fluid system (here, the second fluid chamber 7) of the first fluid chamber 4, the flow path 5, and the second fluid chamber 7 by the supply / discharge means.

  When the ride comfort control of the vehicle body is performed and the pump 8 supplies the working fluid from the second fluid chamber 7 to the first fluid chamber 4, the switching valve 49 is first switched to the position shown in FIG. When the second liquid chamber 7 and the hydraulic fluid chamber 47 are communicated by 48, the one-way additional pump 50 is driven in the direction of supplying the hydraulic fluid from the hydraulic fluid chamber 47 to the second fluid chamber 7 by driving the motor 11. Therefore, as shown by the arrow in FIG. 15, the working fluid in the working fluid chamber 47 is supplied into the second fluid chamber 7 via the supply path 48.

  When the ride comfort control of the vehicle body is performed and the pump 8 supplies the working fluid from the first fluid chamber 4 to the second fluid chamber 7, the switching valve 49 is switched to the position shown in FIG. And the hydraulic fluid is prevented from being discharged from the second fluid chamber 7 to the hydraulic fluid chamber 47.

  The two operations described above are repeated alternately and continuously. Thereby, after the hydraulic fluid is sufficiently supplied and the balance stroke value is raised and returned to the median value, the switching valve 49 is switched to the position shown in FIG. 14 and the supply path on the hydraulic fluid chamber 47 side of the additional pump 50. 48 and the supply path 48 on the second liquid chamber 7 side of the additional pump 50 are communicated with each other via a switching valve 49 and a bypass path 51.

FIG. 16 is a schematic diagram showing the main part and the discharging operation of the suspension device according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of discharging the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes higher than the median value when the vehicle mass is reduced or the temperature of the accumulator 6 is increased. When the ride comfort control of the vehicle body is performed in this state, the stroke on the extension side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is discharged from the hydraulic fluid system (here, the second fluid chamber 7) of the first fluid chamber 4, the flow path 5, and the second fluid chamber 7 by the supply / discharge means.

  When the ride comfort control of the vehicle body is performed and the pump 8 supplies the working fluid from the first fluid chamber 4 to the second fluid chamber 7, the switching valve 49 is switched to the position shown in FIG. 7 is connected to the hydraulic fluid chamber 47 through the supply passage 48, the switching valve 49, and the bypass passage 51, and the hydraulic fluid is discharged from the second fluid chamber 7 to the hydraulic fluid chamber 47. At this time, in order to prevent the working fluid from suddenly moving from the second fluid chamber 7 to the working fluid chamber 47, the switching valve 49 is appropriately switched to the position shown in FIG. The communication with the hydraulic fluid chamber 47 through the bypass 51 and the interruption are repeated, and the hydraulic fluid is gradually moved. After the hydraulic fluid is sufficiently discharged and the balance stroke value is raised and returned to the median value, the switching valve 49 is switched to the position shown in FIG. 14 to cut off the communication between the second fluid chamber 7 and the hydraulic fluid chamber 47. To do.

The structure of the suspension device corresponding to claim 6 shown in FIG. 14 is newly added to return the balance stroke value of the first liquid chamber 4 to the median value compared to the suspension device shown in FIGS. Since it is not necessary to provide a motor for driving the pump, the configuration is more advantageous from the viewpoint of suppressing an increase in cost and weight.
A configuration similar to that of FIG. 14 is shown in FIG.

FIG. 17 is a schematic view showing a main part of a suspension device according to an embodiment of the present invention.
Since the configuration other than the supply / discharge means is the same as the configuration shown in FIGS. 1 and 2, the description thereof is omitted.
In the suspension device shown in FIG. 17, the hydraulic fluid is supplied to and discharged from the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 in the same manner as that shown in FIG. The structure which provides the possible supply / discharge means is shown.

  This supply / discharge means is configured as follows. A hydraulic fluid chamber 52 is provided separately, a supply path 53 communicating from the flow path 5 to the hydraulic fluid chamber 52 is provided, and a check valve 54 for preventing a backflow is arranged in the middle of the supply path 53 as viewed from the flow path 5. A one-way additional pump 55 is provided. The additional pump 55 is driven by a motor 11 that drives the pump 8.

  In addition, the supply path 53 on the hydraulic fluid chamber 52 side of the additional pump 55 and the supply path 53 on the check valve 54 side of the additional pump 55 are bypassed so that the supply function of the additional pump 55 can be selected. The flow path 5 on the second liquid chamber 7 side of the pump 8 and the flow path 5 on the first liquid chamber 4 side of the pump 8 are connected via an additional bypass path 57. The bypass passage 56 and the additional bypass passage 57 are communicated so as to be able to be shut off, and one of the bypass passage 56 and the additional bypass passage 57 is surely communicated and the other is shut off. (Equivalent to claim 6)

  Further, the supply path 53 on the flow path 5 side of the check valve 54 and the hydraulic fluid chamber 52 are communicated with each other through the discharge path 59 and the additional switching valve 60 so as to be shut off.

  In normal vehicle height adjustment and ride comfort control of the vehicle body, the switching valve 58 is switched to the position shown in FIG. 17, the supply path 53 on the hydraulic fluid chamber 52 side of the additional pump 55, and the check valve 54 side of the additional pump 55. Since the additional pump 58 is driven by the motor 11 in conjunction with the drive of the pump 8, the supply passage 53 is communicated with the supply passage 53 through the switching valve 58 and the bypass passage 56. The hydraulic fluid only circulates through the supply path 53, the switching valve 58, and the bypass path 56, and is not supplied to the flow path 5.

FIG. 18 is a schematic diagram showing the main part and the supply operation of the suspension apparatus according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of supplying the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. When the ride comfort control of the vehicle body is performed in this state, the stroke on the contraction side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is supplied to the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 by the supply / discharge means.

  When the ride comfort control of the vehicle body is performed and the pump 8 is driven by the motor 11, the switching valve 58 is first switched to the position shown in FIG. 18, the supply path 53 on the hydraulic fluid chamber 52 side of the additional pump 55, The communication with the supply path 53 on the check valve 54 side of the additional pump 55 via the bypass path 56 is shut off by the switching valve 58, and the flow path 5 on the second liquid chamber 7 side of the pump 8 and the pump 8. The flow path 5 on the one liquid chamber 4 side communicates with the additional bypass path 57 and the switching valve 58.

  In this state, the pump 8 cannot pump the hydraulic fluid, and the additional pump 55 is driven by the motor 11, so that the flow from the hydraulic fluid chamber 52 through the check valve 54 and the supply path 53. The hydraulic fluid can be supplied to the passage 5, and thereby the hydraulic fluid is supplied to the first liquid chamber 4. Thereby, after the hydraulic fluid is sufficiently supplied and the balance stroke value is raised and returned to the median value, the switching valve 58 is switched to the position shown in FIG. 17 and the supply path on the hydraulic fluid chamber 52 side of the additional pump 55. 53 and the supply passage 53 on the check valve 54 side of the additional pump 55 are communicated with each other via a switching valve 58 and a bypass passage 56.

FIG. 19 is a schematic diagram showing the main part and the discharging operation of the suspension device according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of discharging the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes higher than the median value when the vehicle mass is reduced or the temperature of the accumulator 6 is increased. When the ride comfort control of the vehicle body is performed in this state, the stroke on the extension side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is discharged from the hydraulic fluid system of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 (here, the flow path 5) by the supply / discharge means.

  The additional switching valve 60 is switched to the position shown in FIG. 19, the flow path 5 is communicated with the hydraulic fluid chamber 52 via the supply path 53, the discharge path 59, and the additional switching valve 60, and the hydraulic fluid is operated from the flow path 5. The liquid is discharged into the liquid chamber 52. After the hydraulic fluid is sufficiently discharged and the balance stroke value is lowered and returned to the median value, the additional switching valve 60 is switched to the position shown in FIG. 17 to cut off the communication between the flow path 5 and the hydraulic fluid chamber 52. The switching valve 58 is switched to the position shown in FIG.

The configuration of the suspension device corresponding to claim 6 shown in FIG. 17 is the same as the configuration shown in FIG. 14, and the balance stroke value of the first liquid chamber 4 is set as compared with the suspension device shown in FIGS. 2 and 5. In order to return to the median value, it is not necessary to provide a new motor for driving the additional pump. Therefore, the configuration is more advantageous from the viewpoint of increasing cost and weight.
Furthermore, the suspension device according to the present invention may be configured as shown in FIG.

FIG. 20 is a schematic diagram showing a main part of a suspension device according to an embodiment of the present invention.
Since the configuration other than the supply / discharge means is the same as the configuration shown in FIGS. 1 and 2, the description thereof is omitted.
In the suspension device shown in FIG. 20, the hydraulic fluid is supplied to and discharged from the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 in the same manner as that shown in FIG. The structure which provides the possible supply / discharge means 61 is shown.

Here, the supply and discharge means is provided with an additional accumulator, and the additional liquid chamber of the additional accumulator and the hydraulic fluid system are communicated so as to be able to be shut off, and a flow path between the pump and the second liquid chamber Are configured to communicate with each other in such a manner that they can be blocked.
More specifically, the supply / discharge means 61 is configured as follows. An additional accumulator 62 is provided separately, and the additional liquid chamber 63 of the additional accumulator 62 and the flow path 5 located between the pump 8 and the second liquid chamber 7 are shut off via the supply / discharge path 64 and the switching valve 65. The flow path 5 between the pump 8 and the second liquid chamber 7 is communicated so as to be shut off by a switching valve 65 (corresponding to claim 7). Here, one additional accumulator 62 is provided in the vehicle (corresponding to claim 8), and the additional liquid chamber 63 is similarly connected to the hydraulic fluid system of the suspension device provided in the other wheels. By providing one additional accumulator 62 in the vehicle, cost and weight can be suppressed.

  In normal vehicle height adjustment and ride comfort control of the vehicle body, the switching valve 65 is switched to the position shown in FIG. 20, and the hydraulic fluid from the first fluid chamber 4 to the second fluid chamber 7 is driven by the motor 11 of the pump 8. Or the working fluid is supplied from the second fluid chamber 7 to the first fluid chamber 4.

FIG. 21 is a schematic diagram showing the main part and the supply operation of the suspension apparatus according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of supplying the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes lower than the median value when the vehicle mass increases or the temperature of the accumulator 6 decreases. When the ride comfort control of the vehicle body is performed in this state, the stroke on the contraction side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is supplied to the hydraulic fluid system (here, the flow channel 5) of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 by the supply / discharge means.

  The switching valve 65 is switched to the position shown in FIG. 20 so that the additional liquid chamber 63 and the flow path 5 communicate with each other via the supply / discharge path 64 and the flow path 5 between the pump 8 and the second liquid chamber 7 is blocked. When the pump 8 is driven in the direction in which the hydraulic fluid is supplied to the first liquid chamber 4 side, the hydraulic fluid in the additional liquid chamber 63 passes through the supply / discharge passage 64 and then flows into the flow path 5 and thus in the first liquid chamber 4. To be supplied. Thereby, after the hydraulic fluid is sufficiently supplied and the balance stroke value is raised and returned to the median value, the switching valve 65 is switched to the position shown in FIG. 20 to supply / discharge the flow path 5 and the additional liquid chamber 63. The communication via the path 64 is cut off, and the pump 8 and the second liquid chamber 7 are communicated via the flow path 5 to perform normal vehicle height adjustment or ride comfort control of the vehicle body.

FIG. 22 is a schematic diagram showing the main part and the discharging operation of the suspension device according to one embodiment of the present invention shown in FIG.
Hereinafter, the operation of discharging the hydraulic fluid by the supply / discharge means will be described with reference to FIG.

  The balance stroke value of the first liquid chamber 4 becomes higher than the median value when the vehicle mass is reduced or the temperature of the accumulator 6 is increased. When the ride comfort control of the vehicle body is performed in this state, the stroke on the extension side of the first liquid chamber 4 is insufficient, and it becomes impossible to control the ride comfort sufficiently and stably, so that the balance stroke value should be returned to the median value. The hydraulic fluid is discharged from the hydraulic fluid system of the first liquid chamber 4, the flow path 5, and the second liquid chamber 7 (here, the flow path 5) by the supply / discharge means.

  The switching valve 65 is switched to the position shown in FIG. 22 so that the additional liquid chamber 63 and the flow path 5 communicate with each other via the supply / discharge path 64 and the flow path 5 between the pump 8 and the second liquid chamber 7 is blocked. When the pump 8 is driven in the direction in which the hydraulic fluid is discharged from the first liquid chamber 4, the hydraulic fluid is discharged from the first liquid chamber 4 into the additional liquid chamber 63 via the supply / discharge path 64. Thus, after the hydraulic fluid is sufficiently discharged and the balance stroke value is lowered and returned to the median value, the switching valve 65 is switched to the position shown in FIG. 20 to supply / discharge the flow path 5 and the additional liquid chamber 63. The communication via the path 64 is cut off, and the pump 8 and the second liquid chamber 7 are communicated via the flow path 5 to perform normal vehicle height adjustment or ride comfort control of the vehicle body.

  According to the structure of the suspension device corresponding to claim 7 shown in FIG. 20, compared with the suspension device shown in FIGS. 2 and 5, the balance stroke value of the first liquid chamber 4 is renewed to the median value. Since it is not necessary to provide an additional pump and a motor for driving the motor, it is more advantageous from the viewpoint of reducing cost and weight.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible.

  The present invention is effective when applied to a suspension device capable of adjusting the vehicle height.

It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. It is a schematic diagram which shows the principal part and supply operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part and discharge operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. It is a schematic diagram which shows the principal part and supply operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part and discharge operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. It is a schematic diagram which shows the principal part and supply operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part and supply operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part and discharge operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part of the suspension apparatus which is one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the structure of the piston and rod of the suspension apparatus which is one Embodiment of this invention shown in FIG. It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. It is a schematic diagram which shows the principal part and supply operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part and discharge operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. It is a schematic diagram which shows the principal part and supply operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a schematic diagram which shows the principal part and discharge operation | movement of the suspension apparatus which are one Embodiment of this invention shown in FIG. It is a mimetic diagram showing the important section of a suspension device which is one embodiment of the present invention. FIG. 21 is a schematic diagram showing a main part and a supply operation of the suspension device according to an embodiment of the present invention shown in FIG. 20. FIG. 21 is a schematic diagram showing a main part and a discharging operation of the suspension device according to an embodiment of the present invention shown in FIG. 20. It is a schematic diagram which shows the principal part of the conventional suspension apparatus. It is a schematic diagram which shows the principal part of the conventional suspension apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle member 2 Shock absorber 3 Spring 4 1st liquid chamber 5 Flow path 6 Accumulator 7 2nd liquid chamber 8 Pump 9 Cylinder housing 10 Additional cylinder housing 11 Motor 12 Gas chamber 13 Supply / discharge means 14 Hydraulic fluid chamber 15 Supply path 16 Discharge path 17 Additional pump 18 Check valve 19 Switch valve 20 Motor 21 Supply / discharge means 22 Supply path 23 Switch valve 24 Check valve 25 Filter 26 Additional pump 27 Motor 28 Supply / discharge means 29 Hydraulic fluid chamber 30 Switch valve 31 Discharge path 32 Supply Path 33 Piston 34 Rod 35 Cylinder 36 Supply device 37 Check valve 38 Seal 39 Supply chamber 40 Seal 41 Operation chamber 42 Operation path 43 Operation path 44 Centering spring 45 Path 46 Restriction 47 Hydraulic fluid chamber 48 Supply path 49 Switching valve 50 Additional pump 51 Bypass path 52 Hydraulic fluid chamber 53 Supply path 54 Check valve 55 Additional pump 56 Bypass path 57 Additional bypass path 58 Switching valve 59 Discharge path 60 Additional switching valve 61 Supply / discharge means 62 Additional accumulator 63 Additional liquid chamber 64 Supply / discharge path 65 Switching valve

Claims (8)

A suspension device, in which an axle member that rotatably supports a wheel is connected to a vehicle body via a shock absorber and a spring,
Between the axle member and the vehicle body, a first liquid chamber is interposed in series with the spring,
While communicating with the first liquid chamber via a flow path, a second liquid chamber forming a part of an accumulator is provided,
A pump capable of bidirectional liquid feeding is provided in the flow path,
A suspension device, characterized in that a supply / discharge means capable of supplying and discharging hydraulic fluid from the outside is provided in the hydraulic fluid system of the first liquid chamber, the flow path, and the second liquid chamber. A suspension device, in which an axle member that rotatably supports a wheel is connected to a vehicle body via a shock absorber and a spring,
Between the axle member and the vehicle body, a first liquid chamber is interposed in series with the spring,
While communicating with the first liquid chamber via a flow path, a second liquid chamber forming a part of an accumulator is provided,
A pump capable of bidirectional liquid feeding is provided in the flow path,
A suspension apparatus characterized in that a supply / discharge means capable of supplying and discharging gas from the outside is provided in the gas chamber of the accumulator.   The supply / discharge means is provided with a hydraulic fluid chamber, and the hydraulic fluid system and the hydraulic fluid chamber communicate with each other via an additional pump, and the hydraulic fluid chamber and the hydraulic fluid system communicate with each other so as to be shut off. The suspension device according to claim 1, comprising:   3. The suspension according to claim 2, wherein the supply / discharge unit is configured to communicate the atmosphere and the gas chamber via an additional pump and communicate the atmosphere and the gas chamber so as to be shut off. apparatus.   The supply and discharge means is provided with a hydraulic fluid chamber, and the hydraulic fluid system and the hydraulic fluid chamber communicate with each other via a supply device that is passively operated by the pump, and the hydraulic fluid chamber and the hydraulic fluid chamber The suspension device according to claim 1, wherein the suspension device is configured to communicate with a liquid system so as to be shut off.   The suspension apparatus according to claim 3, wherein the additional pump is driven by a motor that drives the pump, and a supply operation by the additional pump can be selected.   The supply / discharge means is provided with an additional accumulator, and the additional liquid chamber of the additional accumulator and the hydraulic fluid system are communicated so as to be shut off, and the flow path between the pump and the second liquid chamber can be shut off. The suspension device according to claim 1, wherein the suspension device is configured to communicate with the suspension device.   The suspension apparatus according to claim 7, wherein one additional accumulator is provided in a vehicle.

Images