JPH0735103A - Hydraulic assembly - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent damage to the seal by safely and easily filling oil in the accumulator of the hydraulic assembly. A hydraulic assembly is composed of a working chamber 1 having a working piston 2 and a pressure accumulating chamber 9 having a pressure accumulating piston 12, a pressure accumulating spring 12 and a plunger 15, and is filled with hydraulic oil.
A radial seal 18 is provided in the communication hole 17 of both chambers, and a connection nipple 19 is provided in the passage 21. A movable valve member 24 is provided in the exhaust hole 23 of the pressure accumulating chamber, and a rocker plate 25 for shutting off the connection nipple is attached via a bolt 28 and a nut 29. When injecting hydraulic fluid into the accumulator, loosen the nut, turn the rocker plate, open the exhaust hole and the connection nipple, and attach the injection hose to the connection nipple.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is based on a hydraulic assembly according to the general concept of the main claim.

[0002]

2. Description of the Related Art A known hydraulic assembly (German published patent publication No. 3 828 699) described in the similar concept is configured as a hydraulic / pneumatic pressure booster, and the accumulator has an exhaust hole and the accumulator. This vent hole opens when oil is filled in. For this reason the exhaust hole is controlled by a movable valve member, which is arranged on a plate configured as a rocker and fixed to the assembly by means of screws, with a constant rubber mushroom on the side of the rocker opposite the movable valve member. Imparts elasticity. In addition, a filling valve is arranged at another location of the hydraulic assembly, which allows the oil to be replenished in the accumulator. The rocker must be removed along with the valve member to prevent damage to the seal during this refill operation. A cap, which is provided as a safety component in the connection nipple of the filling connection to prevent damage to the seal, is connected to the rocker via a wire loop, and the worker trying to fill oil connects the refueling hose to the connection nipple. You must first remove the wire loop before you do this. However, to prevent damage during filling, the operator must actually remove the rocker when removing the wire loop. However, as it turns out in practice, in many cases the worker does not read or take care of the instruction manual, removes the wire loop without simultaneously removing the rocker to reach the connecting nipple, and / or safety. After removing parts (caps) and lockers, at least one of them may be lost.

[0003]

On the other hand, the hydraulic assembly according to the invention having the features specified in the main claim has the advantage that no additional parts are required and, in some cases, the cap is omitted. Filling or refilling of the accumulator is guaranteed without any drawbacks. In any case, two devices decisive for refilling are released, for example by turning or completely removing the plate and simply changing the position: the vent hole and the connecting nipple are released and the vent hole is filled when it is still closed. Can't do. As long as this position adjustment of the plate is done by simple pivoting without completely removing the plate, loss of parts is also prevented.

[0004]

According to an advantageous configuration of the invention, the plate is designed as a rocker, one lever arm of which is provided with an exhaust valve member and the other lever arm of which is Useful as a safety component. Positioning can be done by simply turning the rocker, releasing both devices, the vent and the filling nipple. According to the present invention, the plate can naturally be fixed on one side, and the filling nipple is provided, for example, between the exhaust hole and the connection point of the plate,
Alternatively, the lever projects from the connecting nipple through the exhaust hole when viewed from the fixing point.

According to another advantageous development of the invention, the plate has holes for its support, which allow it to be tilted or rotatably supported by means of screw bolts with play. And it can be tightened (with a head screw with a collar or a bolt and a nut with a screw). The decisive point is that the plate can be adjusted by lightly loosening the screw or nut, or that the plate can also function as an overpressure protection part and an exhaust valve when tightening the screw or nut due to an appropriate elastic structure. Is.

According to a further advantageous refinement of the invention, the screwing device can be moved, for example by changing the screw after assembly, or by only a few threads required for tightening or loosening and leaving the rest. Has a special screw shaping that makes the movement heavy so as to prevent further rotation, so that the screw is not completely removed.

A further advantageous refinement of the invention is that which is known per se (German published patent publication 38 28 6).
No. 99) and a hydraulic / pneumatic pressure booster corresponding to the features of claim 5. In particular, in this pressure booster, oil filling can cause significant damage to the piston seal.
The filling of the oil is always constant, with an overpressure that overcomes the force of the pressure-accumulation spring, and the pressure-accumulation piston slides after the oil has been sufficiently filled and the exhaust hole is released. As a result, at the same time, the specific pressure is not exceeded in the pressure accumulating chamber. However, for a sufficient exhaust process, a cylinder for accommodating the accumulator piston must be mounted vertically so that the existing air volume can be accumulated upwards. In this known pressure booster, an overfill valve is provided as an additional overfill protection, the inlet of which is controlled by the accumulator piston only after a short stroke.

Other advantages and advantageous configurations of the invention can be read from the following description, drawings and claims.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the object of the present invention is shown in the drawings and will be described in detail below.

In the embodiment shown in the drawings, a working piston 2 is axially slidably arranged in a working chamber 1 filled with working oil, and the piston is passed through a hole of a casing 3. A piston rod 4 protruding from the casing is arranged for transmitting power to the working piston 2.
Further, a disc piston 5 is fixed to the working piston 2 and the piston rod 4. The disc piston 5 is radially sealed with respect to the envelope tube 6 and thus separates two chambers 7, 8 which are alternately supplied with compressed air for fast-forwarding of the working piston 2. . As soon as an overpressure is generated in the pneumatic chamber 7, the working piston 2 moves down. As soon as an overpressure is generated in the pneumatic chamber 8, the working piston 2 again moves up to the starting position shown in the figure.

As shown in the drawing, a pressure accumulating chamber 9 hydraulically coupled to the actuating chamber 1 is provided above the actuating chamber 1, in which the actuating piston 2 is constituted by a pressure accumulating piston 11 and a pressure accumulating spring 12.
At the time of fast-forwarding, the fluid pressure accumulated enough to fill and hold the working oil in the working chamber 1 is generated by causing the working chamber 1 to flow backward. The accumulator piston 11 is hermetically sealed in the radial direction and is slidably inserted in the jacket pipe 13 in the axial direction. A drive piston 14 of a plunger 15 is supported in the jacket pipe 13 so as to be sealed in the radial direction and slidably in the axial direction, and the drive piston resists the force of the pressure accumulating spring 12 and operates the working chamber 1 Can be slid in the direction of. The plunger 15 is sealed in the radial direction and is inserted into the pressure accumulating piston 11, and enters the pressure accumulating chamber 9. Compressed air driving the drive piston 14 and the plunger 15 is introduced into the control chamber 16 above the drive piston 14. This control of the supply of compressed air takes place when the working piston 2 has finished its rapid traverse and before the actual compression stroke of the working piston 2 begins. If the drive piston 14 slides by compressed air, the plunger 15 advances into the communication hole 17 leading from the pressure accumulating chamber 9 to the working chamber 1 after advancing the prestroke.
Thereafter, this communication is interrupted by the cooperation of the radial seal 18, and when the plunger 15 further enters the working chamber 1, the working piston 2 is appropriately loaded there and the working fluid is pushed away. Since the cross-sectional area of the working piston 14 is much larger than that of the plunger 15, the air pressure in the control chamber 16 causes the working chamber 1
A suitably high pressure conversion to the internal hydraulic pressure takes place. Since the cross-sectional area of the working piston 2 is still much larger than that of the plunger 15, another power conversion occurs in the working chamber 1 for the working piston 2 and, accordingly, an appropriate adjusting force for the piston rod 4.

In the return stroke of the piston rod 4, the control chamber 16
The air pressure is reduced inside, and the accumulator spring 12 pushes the actuating piston 14 back to the starting position shown. At the same time, the working piston 2 is again slid to the illustrated starting position by the disc piston 5 through the pressure reduction in the air pressure chamber 7 or the pressure increase in the air pressure chamber 8.
The working fluid is pushed away by the working piston 2 and the accumulator 9
Then, the accumulator piston 11 slides to the illustrated starting position against the force of the accumulator spring 12.

The filling of the pressure accumulating chamber 9, and thus the working chamber 1, for example a fresh filling or replenishment, is also carried out via the connecting nipple 19 and the passage 21 of the casing 3 leading to the pressure accumulating chamber 9. This connecting nipple 19 is a conventional threaded nipple for such hydraulic injection. When the pressure accumulating piston 11 rises during injection into the pressure accumulating chamber 9,
Immediately before reaching the end position of the stop 22, the exhaust hole of the accumulator 9
23 is released and the exhaust hole is controlled via the movable valve member 24.
The movable valve member 24 is also arranged on a rocker plate 25, to the other end of which is fastened a closing member 26, which closes the connecting nipple 19 in the position shown. Rocker plate 25
Has a hole 27 through which the rocker plate is loosely supported by screw bolts 28 and can be tightened via nuts 29. The threaded bolt 28 is firmly connected to the jacket tube 13 and has a head 31, which prevents the nut 29 from coming off completely from the threaded bolt 28.

According to the present invention, when the nut 29 is loosened and the rocker plate is rotated in order to inject it into the pressure accumulating chamber 9, both the exhaust hole 23 and the connecting nipple 19 are released by the movable valve 24 and the closing member 26.

Only then can the worker attach the injection hose to the connecting nipple 19. During the filling process of the pressure accumulating chamber 9, the air existing there escapes through the exhaust hole 23 and the hydraulic oil begins to be pushed away, and the filling process ends, the rocker plate 25 changes its position to the position shown in the drawing, and then the nut 29 The movable valve member 24 and the closing member 26 are tightened at the positions shown by being screwed. The elasticity of the rocker plate 25 is configured such that the movable valve member 24 is slightly bent and a limited amount of hydraulic pressure can flow out through the exhaust hole 23 when the pressure accumulating piston 11 is at the end position and when the pressure in the pressure accumulating chamber 9 is overpressure. be able to.

The features shown in the description, the claims and the drawings can all be essential to the invention either alone or in any combination with one another.

[Brief description of drawings]

FIG. 1 is an example of the subject of the present invention.

[Explanation of symbols]

 1 Working Chamber 2 Working Piston 3 Casing 4 Piston Rod 5 Disc Piston 6 Envelope Pipe 7 Air Pressure Chamber 8 Air Pressure Chamber 9 Accumulation Chamber 11 Accumulation Piston 12 Accumulation Spring 13 Enclosure Pipe 14 Drive Piston 15 Plunger 16 Control Chamber 17 Contact Hole 18 Radial Seal 19 Connection nipple 21 Passage 22 Stop 23 Exhaust hole 24 Movable valve member 25 Rocker plate 26 Closing member 27 Hole 28 Screw bolt 29 Nut 31 Head

Claims (7)

[Claims] 1. A hydraulic assembly having an accumulator chamber filled with oil, the chamber being subjected to a substantially constant pressure by a pressure accumulator piston, and being hydraulically coupled to an actuation chamber having an actuating piston. And has an exhaust device for the accumulator chamber for leaking air or overfilling, which device has an exhaust hole controlled by a valve member arranged in the plate of the accumulator chamber, said plate being of the accumulator chamber casing. In the case where it is removably arranged on the outer surface and has an oil-filled connection part of the accumulator and a connection nipple equipped with a safety part (closing part) for the connection part to reach the oil-filled connection part, A hydraulic assembly, characterized in that the components (26) are also arranged on the plate (25), and the exhaust holes (23) and the connecting nipples (19) can be reached by adjusting the position of the plate. 2. The plate (25) is configured as a locker,
2. The hydraulic assembly according to claim 1, wherein a valve member (24) for the exhaust hole (23) is arranged on one lever arm, and the other lever arm serves as a safety component. 3. The plate (25) has a hole (27) for its bearing,
With this hole, the plate has a play, is tiltably or rotatably supported by a screw bolt (28), and can be tightened (with a head screw with a flange or a screw bolt and a nut). The hydraulic assembly according to claim 1 or 2. 4. Hydraulic assembly according to claim 3, characterized in that the screwing device (28, 29, 31) is ensured so that the screw does not come off completely. 5. A pressure-accumulation piston (11) configured as a hydraulic / pneumatic pressure booster, capable of generating a pressure accumulation, receiving a spring load, slidable in the axial direction, and sealing in the radial direction, the piston being filled with oil. The accumulator chamber (9) is separated from the air-filled spring chamber that receives the accumulator spring (12) and the lateral wall between the working chamber (1) and the accumulator chamber (9) has a control hole (17) in the center. The hole is the plunger
A hydraulic assembly characterized in that (15) is inserted through a proper pre-stroke after being sealed in the radial direction, and further a plunger (15), in particular, a pneumatic drive device is provided. 6. A communication hole (17) at the center in the pressure accumulating piston (11).
There is a guide hole aligned with the
A hydraulic assembly as claimed in claim 5, characterized in that (15) is radially sealed and guided so as to be slidable in the axial direction. 7. The exhaust hole (23) is formed by a pressure accumulating piston (11),
7. The hydraulic assembly according to claim 1, which is released only when it is in its starting position.