JPS6081504A - Hydrualic actuator - Google Patents

Abstract

PURPOSE:To control the loss of a hydrulic operating fluid, by providing a leakage oil recovery pump on a hydraulic pressure actuation mechanism. CONSTITUTION:A leakage oil recovery pump 15 is provided on a hydraulic pressure actuation mechanism 1. With this construction, as leakage oil is recovered for reuse even if there is the oil leakage at a sealed part of a hydraulic pressure actuation mechanism 1, the loss of hydraulic operating fluid can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION A hydraulically actuated device having a pressure oil supply circuit for supplying hydraulic oil on one side and a hydraulic actuation mechanism operated by the supply of hydraulic oil from this pressure oil supply circuit on the other side, In particular, in the case of a vehicle height adjustment device, the vehicle height adjustment mechanism as a hydraulically operated mechanism includes a vehicle height adjuster that adjusts the vehicle height of the vehicle by expanding and contracting the vehicle height adjustment device.

This vehicle height adjuster generally has a piston rod that is slidably inserted into a cylinder. ” seals are more effective in preventing oil leakage.

However, if we try to further improve the sealing performance, that is, tighten the seal, in order to reduce the loss of hydraulic oil, the sliding properties of the piston rod will be hindered, and furthermore, the seal will dig into the piston loft, which is an inconvenience. There is a fear that this may occur. On the other hand, if the seal is loosely tightened in order to place more emphasis on the sliding properties of the piston rod, the amount of lubricant from the seal portion increases significantly, which increases the loss of hydraulic oil and becomes uneconomical.

Therefore, in view of the above-mentioned circumstances, the present invention is based on the premise that the seal should be loosely tightened in order to guarantee the sliding performance of the piston rod, thereby ignoring the first problem that may lead to oil leakage. The purpose of the present invention is to provide a new hydraulic actuation device that is optimal as a vehicle height adjustment device that can be recovered and reused.

In order to achieve this objective, the configuration of the present invention includes a pressure oil supply circuit that has a hydraulic power source and a switching valve and supplies hydraulic oil, and also includes a pressure oil supply circuit that supplies hydraulic oil from the pressure oil supply circuit. In the hydraulically actuated device having a hydraulically actuating mechanism operated by a hydraulically actuating mechanism, the hydraulically actuating mechanism includes an oil leak recovery pump.

The present invention will be explained below based on the illustrated embodiments.

As shown in Figure 1, the hydraulic operating device according to the present invention has a hydraulic operating mechanism (1) and a pressure oil supply of 2Hg.
It has a circuit (2+), and in this embodiment, it is similar to the vehicle height adjustment device of the vehicle.

The hydraulic actuation mechanism (1) has a close center type valve, and in this embodiment, the vehicle height adjustment mechanism (consisting of a shallow groove) allows the vehicle height to be adjusted by adjusting the vehicle height. The vehicle height can be adjusted using a pair of vehicle height adjusters (11) installed on each of the front and rear sides of the vehicle.
ft! This is done by supplying oil to extend it, or by discharging hydraulic oil from the vehicle height adjuster 00) and contracting the height adjuster 1. Furthermore, the supply of hydraulic oil to the vehicle height adjuster 00), the discharge of hydraulic oil from the vehicle height adjuster (101), and the maintenance of the supply state and discharge state of the hydraulic fluid are referred to as 00) J is performed by the connected switching valve (11). This switching valve (old) is in the cutoff state during normal times, but when the solenoid (11α) is energized, the vehicle height adjuster (10
) is formed to allow communication with Jl. In addition, this switching valve! IIIK is the aperture (llb
) is formed, and when supplying hydraulic oil to the vehicle height adjusters (10), care must be taken not to cause variations in the extended state of each vehicle height adjuster (10)! There are 1.

An accumulator (I2) is installed between the above switching valve (old) and the height adjuster (10), and the vehicle height A1 adjuster (
10) is prevented from gradually descending due to oil leakage during operation and causing problems. In addition, 4v1 oil is supplied into the accumulator (12) via a pressure reducing valve (131), 111, and a solenoid valve (14) is arranged between this pressure reducing valve (I3) and the accumulator (12). It is something that has been set up.

The vehicle height adjuster (10) has an oil leakage recovery pump (15).
This oil leakage recovery pump (15) is equipped with a free piston (15a) that is slidably disposed inside.
) has an oil chamber (15) divided by
The free piston (15a) is located in the oil chamber (1, 51).
The oil chamber (15) has a spring (15b) that pushes the oil chamber (15) to a negative pressure state. Then, in the oil chamber (15) which is connected to this negative pressure, the oil leaking from the Tungao 1 regulator (10) flows into the suction circuit (16d) and the 1st nuclear circuit (16Q).
The leakage oil sucked into this oil chamber (151) is drained into the drain circuit (16h), and the circuit 13- (16h) It is designed to be collected into the vehicle height adjuster (inside the river) through the check valve (17b) in the oil chamber (I5). (
1 piece (outside V (to extract, free piston (15α)
This is done by pushing back the oil so as to overcome the repulsive force of the spring (15A), and in the illustrated embodiment, the pressure oil supply circuit (2) is connected to the leakage oil recovery pump (15) by the circuit a8). The pressure oil is free piston (15 (Z
), thereby free piston c1
5a), but as shown in Figures 1 and 2 (a), the free piston (15a) may be pushed back by the operation of a separately provided pump P.
Also, as shown in Figure 2 (b), the free piston (15a
) may be pushed back.

In addition, the vehicle height adjuster (10) installed in the vehicle height adjuster as the hydraulic operating mechanism (1) in this embodiment is slidably mounted on the piston rod C1oa in the cylinder (lOa).
) and a seal (1 oz) on the piston rod (1 oz).
0 (-) is interposed, and supplies hydraulic oil to the lower chamber A in the cylinder (10 ct) to connect the piston rod (lob).
), and the fangs 1 are formed so as to discharge the hydraulic oil from the lower chamber A and lower the piston rod (IOA). As the piston rod (10I) moves up and down, oil leaks from the seal Cl0C). It is inhaled twice and collected into the lower chamber A in the cylinder (10 (Z)) via the discharge circuit (16h) and check valve (1775).

The hydraulic operation (pressure oil supply circuit connected to the shallow groove (1))
2) has a hydraulic source (20) consisting of a pump, which sucks up hydraulic oil from the tank (21) when it is activated.
'+ so that it is discharged towards the hydraulic operating mechanism (1).
Suginari is here. The pump (20) is appropriately driven by a drive source (22) υ (Yoto), and in this embodiment, the vehicle's driving engine is not used as the drive source (22). It is something.

In addition, the pressure oil supply circuit (2) includes, in addition to the hydraulic actuation mechanism (1) as the vehicle height adjustment mechanism described above, another hydraulic actuation mechanism (power steering as RL) that accommodates an open center type valve. It is also connected to the hydraulic mechanism (1) and has a priority valve (23) in order to supply the desired hydraulic oil to the other hydraulic operating mechanism (1). Po as a hydraulic source (20): Of the hydraulic oil discharged from the knob, a certain amount of hydraulic oil is transferred to the power steering mechanism K as another hydraulic operating mechanism (1).
This will be provided in advance.

The surplus oil diverted by the priority valve (23) is regulated to a predetermined amount via the flow control valve (24) and then supplied to the switching valve (25).
This switching valve (25) supplies a desired amount of hydraulic oil when the vehicle height adjustment mechanism as the hydraulic operating mechanism (1) is activated, and when it is stopped on the hour 1f, the hydraulic oil is supplied. It is formed so that the water is returned to the tank (21). Then, during normal times, that is, when stopped, return the operating oil to tack (2) 1 v, and only when operating, turn the solenoid (25 c
It is designed to switch depending on the excitation to z).

In addition, there is a relief valve (261) between the priority valve (23) and the power steering mechanism as another hydraulic mechanism, and between the flow control valve (24) and the switching valve (25). and(
271 is provided, and each relief valve (26) (
The oil discharged from 2η is pumped into the tank (21).

Furthermore, the hydraulic fluid that has passed through the switching valve (25) is supplied to the vehicle height adjuster (10) side of the hydraulic operating mechanism (1), and is connected to the vehicle height adjuster (10). It is also supplied to the oil leakage recovery pump (15), which is installed in the oil leakage pump (15).

That is, the pressure oil supply circuit (2) is connected to a circuit (18) that communicates with the back of the free piston (15 (Z)) in the oil leak recovery pump (15). Accordingly, the supply of hydraulic oil into the circuit (18) is l:iJ
The free piston (15a) can be pushed back against the repulsive force of the springs (1, 5b) by supplying the hydraulic oil.

In addition, in this embodiment, the pressure oil IJ (supply circuit (2)
) and the hydraulic actuation mechanism (1), an oil separation cylinder (3) is disposed. The oil separation cylinder (3) is for distinguishing between the hydraulic oil housed in the hydraulic operating mechanism (1) and the hydraulic oil inserted through the pressure oil supply circuit (2). , a partition member 31) formed in the shape of a free piston in the cylinder body (30) and slidably disposed with a pressure receiving area of 1:1; ) One room (32
is in communication with the hydraulic operating mechanism (1), and the other 'J
+331 is connected to the pressure oil supply circuit (21).

As a result, the hydraulic oil supplied from the pressure oil supply circuit (2) flows into the other chamber C33+ in the cylinder body (30), presses the partition wall phase (3) 1, and pushes this A1 forward, causing the cylinder body (30) allows the hydraulic oil present in one chamber (321) to be discharged to the hydraulic operating mechanism (1).

Therefore, due to the arrangement of this oil separation cylinder (3), the hydraulic oil in the hydraulic operating mechanism (1) and the hydraulic oil in the pressure oil supply circuit (2) are not mixed, and the hydraulic operating mechanism (
For Il&r, it is possible to use hydraulic oil with low piping resistance and low viscosity, and for the pressure oil supply circuit (2), it is easy to use. This allows the use of highly viscous hydraulic oil.

Note that σ) hydraulic oil is supplied from the pressure oil supply circuit (2) to the other chamber (33) of this oil separation cylinder (3) via the lino conversion valve (25), but there is a A throttle check valve (28) is provided, and when the hydraulic oil in the cylinder (33) is discharged, the partition member (31) is pushed back violently within the cylinder body (30). In other words, the vehicle height adjuster (10) is prevented from being suddenly deflated.

Next, the operation of the above-mentioned hydraulic operating device will be explained.

First, when adjusting the vehicle height higher, the hydraulic source (20j) is activated to discharge hydraulic oil into the pressure oil supply circuit (2). A certain amount of hydraulic oil is supplied to the power steering mechanism via the priority valve (23) at the front end (Jl), and this priority valve (23) supplies excess oil to the flow control valve (Jl). "Supplied".

In the flow control valve (24), the amount of oil is regulated to a certain level and the switching valve (251K is further supplied to A).
At the same time, excess oil is returned to the tank (21).

When the solenoid (25d) of the switching valve (251) is not energized and is in the ON state, the hydraulic oil is transferred to the oil separation cylinder (3) via the throttle check valve (28).
) flows into the other chamber (331).

The hydraulic oil that has flowed into the inner center of the oil separation cylinder (3) pushes the adjacent partition member (31), and the cylinder body (30
) The hydraulic fluid in one chamber (321) is discharged toward the vehicle height adjustment mechanism.

The switching valve (old) in the vehicle height adjustment mechanism is the solenoid (1
1a) is in the ON state by excitation, hydraulic oil flows into the cylinder (lk') of each vehicle height adjuster (10).

The hydraulic oil flowing into the cylinder (10a) raises the piston rod (10b) and adjusts the vehicle height higher.

At this time, since hydraulic oil is supplied to the circuit (181), the free piston (15α) in the oil leak recovery pump (15) is pushed back by the kneading to overcome the repulsive force of the spring (15b). , young,
When there is oil leakage in the oil chamber (151), the leakage oil is removed from the drain circuit (16b) and the check valve (16b).
The vehicle height adjuster (101 cylinders (10
α).

Next, in order to maintain the once raised vehicle height at a desired height position, first, the solenoid (11α) of the switching valve 1 in the vehicle height adjustment mechanism is deenergized and turned OFF. Furthermore, the switching valve (251) in the pressure oil supply circuit (2)
The solenoid (25a) is de-energized and turned off.

By kneading, the hydraulic oil from the hydraulic source (20) is transferred to the tank (
At the same time, the hydraulic oil in the circuit (181) is also discharged to the tank, and the oil leakage recovery pump (15
The hydraulic pressure behind the free piston (15α) applied to 1 is released. As a result, the free piston (15 (Z)) is pushed forward by the spring (15b) and the oil chamber (15 (Z)
1 becomes a negative pressure state. With this, the vehicle height adjuster (10
Even if there is oil leakage at the seal (10c) in the oil leakage pump (15), it will be sucked into the oil chamber (+51) of the oil leakage recovery pump (15) through the suction circuit (16 (Z)) and check valve (17cL). Become.

Furthermore, when lowering the vehicle height, the switching valve (25) is turned OFF and the C switching valve (old) is turned ON. By kneading, the hydraulic oil in the vehicle height adjustment mechanism flows into the blade chamber (321) of the oil separation cylinder (3), and the hydraulic oil in the other chamber 031 flows into the throttle check valve (281, It will be returned to the tank (2) IK via the switching valve (251).

At this time, the flow rate of the hydraulic oil discharged from the other chamber (33) of the cylinder body (30) toward the tank c21) can be suppressed by the throttle check valve, so the vehicle height adjuster (10 ) will not cause any danger of sudden contraction.

Also, at this time, since there is no hydraulic oil supplied to the circuit (181), the free piston (15 (Z)
51)) and creates a negative pressure inside the oil chamber (151), so the seal 0Oc of the vehicle height adjuster (1o)
) If there is any oil leakage, it will be sucked into the oil leakage recovery pump (15).
Of course, it will be necessary to do so.

Therefore, the vehicle height adjuster (Ill) K i oil recovery pump (
15), the seal (1oc'
) All the oil leaking from the section is collected in the cylinder (lk).
Therefore, it is possible to prevent the amount of hydraulic fluid required for the operation of the vehicle height adjuster (lO) from decreasing, and to extend the vehicle height adjuster (10) set to a predetermined height. It becomes possible to maintain the state.

Although not shown in the drawings, in this embodiment, several people are attached to the oil leak recovery pump (19) and a sensor is installed to detect the amount of oil leakage, so that the oil leakage can be corrected at the vehicle height. Regulator (lO1
Of course, it is possible to recover VCl within the same period.

In addition, Fig. 3 partially shows another embodiment of the present invention, but in this embodiment, the separation cylinder (3
) cylinder body (switching valve (11) in the 301V hydraulic operating mechanism (1), oil leak recovery pump (151) connected to the vehicle height adjuster (river) and throttle check valve (21) in the pressure oil supply circuit (21)) 28) is attached to one body.

As a result, the hydraulic actuating device itself according to the present invention can be made more compact, and the number of installed oil separation cylinders (3), switching valves (old 1), oil leak recovery pumps (I5), and throttle check valves (28+) can be reduced. Therefore, it is possible to reduce the cost.

In the above, the hydraulic actuating device according to the present invention is explained as a vehicle height adjusting device for a vehicle, but instead of using the hydraulic actuating device, other hydraulic actuating devices having a shallow groove and a closed center type valve may be used. Moreover, it has a pressure oil supply circuit for supplying hydraulic oil to the external hydraulic actuation mechanism, and can of course be applied to other hydraulic actuation devices.

As described above, according to the present invention, even if there is oil leakage due to the seal part of the hydraulic operating mechanism, it can be recovered and reused, which is an economical method that can suppress the loss of hydraulic oil. Advantageous hydraulic actuators can be obtained. In particular, in a vehicle height adjustment mechanism that has a hydraulically operated mechanism designed to guarantee sliding performance by actively encouraging oil leakage, it is necessary to adjust the vehicle height to the desired height. Another advantage is that it is easy to ensure that the vehicle height adjuster has the necessary amount of hydraulic fluid for maintenance.

Furthermore, if an oil separation cylinder is disposed between the pressure oil supply circuit and the hydraulic operation mechanism, the hydraulic oil between the hydraulic operation mechanism and the pressure oil supply circuit can be divided by 19 ([ This makes it possible to use a low-viscosity hydraulic oil that can reduce piping resistance for the hydraulic operating mechanism, and improves the lubricity of the pump as a hydraulic oil supply circuit and hydraulic source. In addition, between the pressure oil supply circuit and the hydraulic operation mechanism, each hydraulic oil is separated by a separation cylinder, so that one side can be This makes it possible to replenish or replace only one hydraulic fluid while leaving the other hydraulic fluid remaining, which is extremely convenient and economical.

[Brief explanation of drawings]

】・Figure 1 is a circuit diagram showing a hydraulic actuating device according to an embodiment of the present invention, 1-21ffl (a)''? Figure 3 is a partially illustrative diagram of a hydraulically actuated device according to another embodiment. (1)...Hydraulic operation mechanism, (2)...Pressure oil supply circuit, (3)...Separation cylinder, (10)...Vehicle height adjuster, (15)...Oil leak recovery Pump, (20)...hydraulic source, (25)...switching valve. Procedural amendment (voluntary) July 1989) 0 Date 1988 Patent Application No. 188903 2, Name of invention Hydraulic actuating device 3, Person making the amendment Relationship to the case Patent applicant 4, Agent 5, Amendment Subject 1) Detailed explanation of the invention column in the specification 1) Add the following between lines 7 and 8 on page 17 of the specification. Furthermore, although Figures 2 and 4 partially show still another embodiment of the present invention, in this embodiment, 21
The fact that another circuit 08) is provided in place of the circuit a8) in Figure 1 or Figures 2 and 3, and that the circuit 08) is connected to one option (32) of the separation cylinder (3); , the other plan (321 includes partition wall layer +31
1 to the other room (33) side K IUJ force sublink (3
4). As a result, when installing the circuit (18+), there is a risk that the circuit (circuit 08) will have a long distance, whereas when the circuit (I8) of this embodiment is used, the oil leakage recovery pump (I5) is When it is formed integrally with or close to the separation cylinder (3), it is advantageous in that it does not require long-distance piping for the circuit 08). Furthermore, since the oil flowing into the oil leakage recovery pump (15) is the oil that flows within the hydraulic operating mechanism (1), the seal of the free piston (15a) in the oil leakage recovery pump (I5) , there is an advantage that strict sealing, that is, high sealing performance is not required. In this embodiment, when the partition wall member GO in the separation cylinder (3) is biased by the spring (341) and slides to the left in the figure, the oil leakage recovery pump 0
The free piston (15a) in 9 is connected to the spring (15h
) moves to the left in the diagram due to the repulsive force of the oil leakage recovery pump (
Leakage oil will be sucked into the oil chamber a9 in 15+. 2) In the specification, page 19, line 7, "This is a diagram showing."
FIG. 114 is a diagram showing still another embodiment in the same way as FIG. ” he corrected. 3) Regarding the drawings, as shown in the attached sheet, figure j and 3 have been corrected,
4 new figures will be added. Figure 3 0a 1sC Figure 4

Claims (4)

[Claims] (1) It has a pressure oil supply circuit that supplies hydraulic oil with a hydraulic power source and a switching valve, and also has a hydraulic operating mechanism that is operated by the supply of hydraulic oil from the pressure oil supply circuit. In the hydraulically operated device, the hydraulically operated mechanism includes an oil leak recovery pump. (2) The hydraulic actuation mechanism consists of a vehicle height adjustment mechanism having a closed center type valve, and the pressure oil supply circuit has a power that does not exceed other fluid pressure actuation mechanisms having an open center type valve. Connected to the steering mechanism
-C. The hydraulic actuator according to claim 1. (3) The pressure oil supply circuit has a flow control valve between the hydraulic source and the switching valve, and a priority valve between the flow control valve and the hydraulic source, and the A hydraulically actuated device according to claim 1, which is connected to another hydraulically actuated mechanism having an open center type valve. (4) The oil leak recovery pump has a free piston that is slidably disposed inside, and sucks leaked oil into the oil chamber partitioned by the free piston, and also prevents leaked oil from outside the oil chamber. 2. A hydraulically actuated device according to claim 1, wherein the hydraulically actuated device is configured to discharge.