DE1453532A1 - Hydraulic support devices for motor vehicles that can be operated by hand or by electric motor - Google Patents

Description

the "Hydraulic, which can be operated by hand and with an electric motor Support devices for motor vehicles ". Hydraulic supports are operated by hand or Motor pumps actuated. Especially with supports for semi-trailers or trailers a relatively large part of the stroke has to be overcome in a time-consuming manner, because the transmission ratio is designed for the maximum load. In general there is only one-sided operation in known support devices the pump in the usual form of reciprocating pumping. Most of the time When the supports are used in pairs, they are either path-balanced by dual-circuit pumps extended, whereby ground slopes or unevenness cannot be compensated, or by single-circuit pumps, which allow travel compensation, but with one-sided Lift the individual support unevenly.

It has previously been necessary to manually operate the print medium by several To dose valves, which significantly increases the operating time comes that due to the possibility of confusing the valves when they are operated, but also by the possibility of unsolicited operation, accidents caused can be.

The object of the invention is 7. When extending the support legs (idle travel) by means of pressure equalization in the system to compensate for inclines or large unevenness and to achieve that after compensation, the supports continue to extend the same path when the load is lifted (load path) even with unequal loads. 2. To enable the above tasks only with one control element in order to eliminate operating time and the possibility of confusion.

3. To enable operation from both sides of the vehicle optionally and in any direction of rotation of the pump axis by means of a crank and to create either manual or electric motor operation.

4. To enable the electromotive actuation of the support unit without an additional power source from the existing vehicle battery.

5. To cause an adjustable spool that the Pump when a certain crank force is exceeded automatically at high pressure switches.

In one embodiment of the inventive concept, the multi-piston pump working with a high and a low pressure side is designed in such a way that the low pressure side delivers a multiple of the volume of the high pressure side. Here, a channel on the low pressure side connects all the low pressure pistons, while a high pressure channel connects the same number of high pressure pistons for 1 support each.

An adjustable control slide during loading dienung in low pressure, the high pressure side of the Netherlands @ derdruckseiteverbunden so that the support legs have mutually pressure compensation. You can extend it regardless of the path until it touches the ground with the same pressure. When the set low pressure range is exceeded, the control slide is displaced by the pressure of the pressure medium built up in the supports so that the high pressure side is separated from the low pressure side and the latter is connected to the overflow channel. Then the supports are extended in the same way in the high pressure area and thus a horizontal lifting of the trailer is achieved in each case, both with uneven ground and with uneven loading of the individual support legs.

A wobble provided for actuating the pump piston. or the rotary disk is fixed axially displaceably to a limited extent on the drive shaft in two-sided screw -shaped grooves . Thereby die.Antriebswelle hen is in turn at DRE one side shifted in the axial tung RICH counterclockwise about 9o o. On this drive shaft is rotatably mounted and axially displaceable, a spring-loaded ball valve, which is lifted by a ring on the drive shaft in the axial movement of its seat, and outputs the skirt run free, so that the Peder can relax and the supports without-further actuation retract .

Can be Likewise, the inventive idea in other suitable manner (Z.8. By drivers) dissolved in WO axial displacement of the drive shaft is not necessary.

Upon failure of the Iraftquelle operation using the hands is WEI given ter.

Abb.I shows in section A an embodiment of the two-step protocol fen - Two - circuit piston pump.

In the housing (1) which is at the same stock oil tank, there is the pump body (2). On the drive shaft (3), the swash plate (4) is fixed. When the direction of rotation is changed, the control sleeve (5) is axially displaced by its threaded part (6) on the guide pin (7). In doing so, it first lifts the valve pins (8) of the ball valves with its cam ring in order to let them sink again when turning further. The compression springs (9), which are only tensioned in the end position of the control sleeve (5), cause the guide pin (7) to be inserted into the threaded part (6).

This arrangement gives the possibility, depending on the chosen one Drive direction of rotation of the pump by turning back the drain valves of the high pressure channels the drive shaft to open. The low-pressure pistons are located in the pump body (2) (1o) and the high pressure piston (11), which oppose the springs (12) of the swash plate (4) be moved. Via the suction valves (13, 14), the suction channel (15) sucked in the oil of the storage container. Via the check valves (16, 17) this is Oil is then pressed into the low pressure channel (N) or the two high pressure channels (H1 / H2).

The high pressure channels (H1 / H2) are with the connections for the supports (S11S2) in direct connection.

Section B shows the control slide with the housing (18) and the slide (19), which is pushed into the low pressure position # by means of an adjustable compression spring (2o) is.

The amount of oil coming from the low pressure channel is fed through the hole in the Push =! (19) into the high pressure channels (111 / H2) or to the connections (S1 / S2). When the props are extended in the no-load range, this hole is used Pressure equalization instead, which makes it possible to extend this unequal length.

The oil pressure that builds up in the supports after contact with the ground acts on the side of the control slide (19) opposite the compression spring (2o). After the adjustable spring pressure has been overcome, the control slide (19) is moved to the left until it closes the supply lines of the high pressure channels (111 / H2) and the oil coming from the low pressure channel (N) returns to the intake channel (15). Now only the high pressure channels (H1 / H2) act on the supports. In order for a volume equal further filling of the posts and routes the same extension is given under load. As soon as the supports are relieved during lowering , the control slide (19) is returned to the low position by the spring (2o). The pressure position is pushed and the supports can return to their original position under pressure compensation.

Fig. II shows in section A a further embodiment of the two-stage two - circuit piston pump.

Here the swash plate (4) is fastened in a groove (6) by means of a pin (5). Due to the helical design of the groove by 90 ° on both sides, the pin (5) comes to rest at the end of the groove so that the drive shaft (3) is always pushed to the right when it is turned.

A conical valve (7) sits on the drive shaft (3) so that it can rotate and move axially and seals the left-hand space from the storage oil container. When the drive shaft (3) is turned back by 900, it moves to the left by being supported on the pin (5). The valve (7) is lifted from its seat against the spring via a ring (8) located on this shaft and the left-hand space is connected to the storage oil container.

The pump body (2) with low (1o) and high pressure piston (11) as well the control spool shown in section B are designed as described in Fig.

Claims (6)

Patent claims . 1. Hydraulically operated supporting device, characterized gekftnnzeichnet that the two - stage axial piston holds an arbitrary even number of high-pressure ducts corresponds only a Niederdruckkanahaber, the adjustable via an automatically actuated by the pressure of the medium control slide can be separated from the low pressure channel. 2. Hydraulically operated landing gear according to claim 1.-characterized in that when switching the pump from the low pressure half of the even number of high pressure channels one support leg in each high pressure area serve. 3. Hydraulically operated support device according to claim 1 and 2, characterized in that the drive shaft of the pump is shifted laterally when the hand crank is turned back by a pin engaging in the cam groove of the swash plate and thereby opens the drain valve and closes again when turning further. 4. Hydraulically operated support device according to claim 1 and 2, characterized in that when the hand crank is turned back over the drive shaft a driver initially opens the drain valve and closes it again when you turn it further. 5. Hydraulically operated support device according to claim 1 to 43, characterized in that that the pump can be operated waglweise from both sides of the vehicle and any Direction of rotation triggers the lifting process. 6. A hydraulically actuated support device according to claim 1 to 5, characterized in that the hand pump can be operated to extend the support legs also electric motor from the existing in the tractor power source, while maintaining the Möglichkeit.zum manual operation without substantially increased force. 7. A hydraulically actuated support device according to claim 1 to 6, marked by the retraction of the support legs may also be made in electro-notorious actuation possibility only manually by means of Turbel.