EP1681474A2 - Device for controlling the movements of a multi way valve for controlling a piston cylinder unit - Google Patents

Abstract

The device has a control stem actuated by a vehicle driver. The control stem is coupled to a stem (105) of a selector device (7). The stem (105) is coupled to a tubular body (24) that is preloaded by a preloading spring and a ring unit. The tubular body is operatively coupled to a rotary selector unit, where the tubular body has a set of longitudinal slots. A ball (28) is housed in a circumferential chamber of the body.

Description

The above invention relates to a device for controlling the movements inside a multi-way valve for actuating a piston-cylinder unit.

It is known that in earthmoving or agricultural machinery, e.g. Tractors, control valves are provided which act on hydraulic pistons, which are used for moving e.g. a loading bucket or a working device, which are arranged on the rear side of a tractor, such. Turning devices, plows, mowing equipment and the like.

To enable these devices to be actuated from the driver's cab of the vehicle, hydraulic piston-cylinder units are provided, the supply line and the return line, respectively, being connected to a control valve, e.g. a four-way valve, which is supplied in the usual way by the manufacturer of these valves.

Inside the cab of the vehicle, a control lever is arranged, via which the multi-way valve in a suitable Switching position can be brought to give the corresponding device a lifting movement; a different position of the control lever makes it possible to bring the valve in a further position in which a lowering of the device is made possible, and in a third switching position of the valve, it is possible to keep the device in a floating or floating position.

In the known device, the control operations are exclusively dependent on the intervention of the driver, it should be noted that this not only has to pay attention to a precise steering of the vehicle, but also has the task with empathy to bring the multi-way valve in the exact, desired switching position , It should be avoided that faulty circuits are initiated.

It is an object of the present invention to provide an auxiliary control device which is associated with a known multi-way valve which serves to control a hydraulic circuit, wherein it is to be avoided that the driver of the vehicle can act freely and in any manner on the control rod, which the associated valve operated, thereby ensuring that it is possible due to monitored movements of the control rod to block the valve in certain preselected positions.

This object is achieved by a device for controlling the movements inside a multi-way valve that is to drive a piston-cylinder unit is provided, achieved by the control rod of a multi-way valve, which is operable by the driver of a motor vehicle, an additional control rod of an auxiliary device is connected, and the additional control rod is operatively connected to a tubular body, which is acted upon by a compression spring and the tubular body is operatively connected to a rotatable selection device, and the tubular body has longitudinal grooves and circumferential grooves and in these grooves a ball is inserted, which is arranged in a circumferential chamber of a further tubular body, which is arranged in radially outward position.

Further embodiments of the invention can be taken from the subclaims.

• Figur 1 zeigt eine hydraulische Kolben-Zylindereinheit mit dem zugeordneten Antriebskreislauf sowie mit einem Steuerventil, das mit einer Wähleinrichtung 7, entsprechend der vorstehenden Erfindung verbunden ist;
• Figur 2 zeigt die Wähleinrichtung;
• Figur 3 zeigt in einer weiteren perspektivischen Ansicht die Vorderseite der Wähleinrichtung.
• Figur 4 zeigt in perspektivischer Ansicht die teilweise abgenommene Wähleinrichtung.
• Figur 5 zeigt in perspektivischer Darstellung einen rohrförmigen Steuerstuzen, der im Inneren der Wähleinrichtung vorgesehen ist.
• Figur 6, 7, 8 und 9 zeigt im Längsschnitt die Wähleinrichtung in unterschiedlichen Arbeitsstellungen.
• Figur 10 zeigt das Ventil teilweise im Schnitt und in perspektivischer Ansicht.

The subject invention will now be described in more detail with reference to an embodiment and illustrated in the accompanying drawings.

• Figure 1 shows a hydraulic piston-cylinder unit with the associated drive circuit and with a control valve which is connected to a selector 7, according to the above invention;
• Figure 2 shows the selection device;
• FIG. 3 shows in a further perspective view the front side of the selection device.
• Figure 4 shows a perspective view of the partially Removed dialing device.
• FIG. 5 shows a perspective view of a tubular control stub which is provided in the interior of the selection device.
• Figure 6, 7, 8 and 9 shows in longitudinal section the selection device in different working positions.
• FIG. 10 shows the valve partly in section and in a perspective view.

As can be seen from FIG. 1, the hydraulic device consists of a piston-cylinder unit 1, which serves as drive means. With this piston-cylinder unit, a supply line 2 and a return line 3 for the hydraulic fluid is connected.

The lines 2 and 3 are operatively connected to a multi-way valve 4 and this valve has a control rod 5 which is actuated via a control lever 6 which is arranged in the interior of the driver's cab of the vehicle.

The control lever 6 is shown in Figure 3 in three different, engageable positions.

With the control rod 5 of the valve 4, a rod 105 of a selection device 7 is operatively connected, as will be described in more detail below.

The device 7 is connected to a rotatably arranged selector 8, which will also be described in more detail below.

The chamber 9 of the piston-cylinder unit 1 is in operative connection with another line 10 which extends to the device 7 and serves a device for regulating the maximum working pressure. from a pressure gauge 11.

2, the selector 7 can be seen in a perspective view, wherein the selector 8 is shown in the form of a rotary head. This makes it possible to set more precise working positions, which are occupied by the piston rod 5.

The selector 8 can be arranged in different positions, which are indicated by A, B and C.

FIG. 3 shows the selection device 7 with the device 8 in a further perspective view.

From the front of the device 7 are from connecting parts 108 which allow a connection with the valve body 4. Furthermore, the drawing, the front end of the control rod 105 are removed, which will be described in more detail below.

At the front of the device 7, an opening 15 and a connection opening 16 is provided; The meaning of these openings will be described in more detail below.

The opening 15 serves as an inlet opening for the standing under a pressure X fluid to the interior of the multi-way valve 4 out.

The opening 16 represents the outlet opening of the fluid under pressure Y, which prevails inside the valve and is to be supplied to a monitoring sensor 11.

Inside the device 7, the control rod 105 is arranged, which has at its rear end an elastic ring 20 which serves as a stop for a bracket 21 to which a spring 22 abuts, which in turn bears against a bracket 23 which is connected to the tubular Body 24 is in operative connection.

The tubular body 24 surrounds the rod 105 and is influenced by the pretensioned spring 22 via the bracket 23.

The tubular body 24 has circumferential grooves 25, 26, 27, and with these circumferential grooves, a ball 28 can be brought into operative connection, wherein the ball 28 comes to lie in the recess of a further tubular member 29, which is arranged radially outward.

The tubular component 29 is surrounded by a further tubular member 100, and this tubular member 100 has on its side facing the ball 28 on a peripheral chamber 30 which is bounded by an inclined plane 31.

The tubular body 100 is biased by a spring 32. This is also done via a ring 57 (Figure 4), which is acted upon by the pressure of the fluid, which is supplied via the bore 16 of the body 7 (Figure 3). The pressure in the fluid comes directly from the valve 4, which in turn with a Hydraulic pump of the circuit is operatively connected.

The adjustment of the spring 32 and the inclination of the recesses, which are shown in FIG. 5, cause, when the pressure introduced via the bore 15 drops to zero MPa, irrespective of which position the rod 105, according to FIGS , 8 and 9, the entire device is switched back to a neutral position, as shown in FIG.

As can be seen from FIG. 5, the tubular body 24, in addition to peripheral grooves 25, 26 and 27, also has longitudinal channels 33 which allow a longitudinal displacement of the tubular body 24.

In the figures 6, 7, 8 and 9, the device 7 is shown with the corresponding selector 8 in different working positions.

According to Figure 6, the spring 22 is maximally relaxed and presses on the bracket 23 on the body of the rod 105th

In this position, the tubular member can move freely, thanks to the provision of the longitudinal groove 33rd

In Figure 7, the rod marked 105 has been moved in the direction of the arrow (f), whereby a compression of the spring 22 takes place and a reception of the ball 28 in the bypass groove 25 occurs.

In Figure 8, the rod 105 has been displaced in the direction of the arrow (g), whereby the ball 28 in the circumferential groove 26th occurs and a contact between the stop ring 20 and the spring 22 is effected.

In Figure 9, the rod 105 has further leaked from the device 7 and the ball 28 has entered the circumferential groove 27. In this position, the spring 22 is biased to a maximum.

Figures 6, 7, 8 and 9 can be clearly seen the operation of the device.

In Figure 6, the ball 28 is in the groove 33, thus the rod 5 of the valve can perform a floating movement in the axial direction; the rod 105 can be removed from the device 7 e.g. by a length (a) exit.

In Figure 7, the rod 105 has run back into the body of the device 7, such that the ball 28 engages the circumferential groove 25, thereby blocking the rod 5 in this working position.

In the position shown in Figure 8, the ball 28 has entered the circumferential groove 27 of the tubular body 24 and the rod 105 of the device 7 has leaked from this device by a length (b).

Finally, as shown in Figure 9, the rod 105 has further exited the body of the device 7 by an amount (c).

Taking into account that the end of the rod 105 is operatively connected to a multi-way valve, so due to the different positions of the rod 105, as shown in Figure 7, allows the multi-way valve 4 takes exactly and especially in a controlled manner, the desired switching positions.

With the selector 8, which is in position (A), as shown in Figure 2, the tubular member 24 is rotated about its axis over 45 ° thanks to the providence of the component 51, whereby the balls 28 engage with the stop plane 25 in operative connection whereby the rod 105 is blocked in one of the three positions according to FIGS. 7, 8 and 9.

With the selector 8 in position (B), as shown in Figure 2, the tubular member 24 rotates about its axis over another 45 °, thanks to the provision of the part 51, which is connected to the selector 8 via screws 52, whereby the Balls 28 enter the longitudinal groove 33 and causes the rod 105 to remain in operative connection only when the balls 28 enter the groove (FIG. 9).

With the selector 8 in position (C), as shown in Figure 2, the tubular member 24 is rotated by another 45 °, whereby the balls 28 find a resistance, thanks to the providence of the inclined surface 54, which causes the rod 105 may remain in all three positions according to Figure 7, 8 and 9.

The function (C) causes, when reaching a maximum pressure in the line 10 (Figure 10), that of the spring 56 acted upon valve moves in the longitudinal direction, thanks to the pressure of the bore 16 (Figure 3) occurs. This pressure discharges to the chamber 53 (FIG. 4) (thanks to the angular position of the component 51 bringing the chamber 53 into communication with the chamber 58). As a result of the displacement of the tubular component 100 to the left, the balls 28 are released. As a result, the rod 105 moves to a neutral position, as shown in FIG.

Claims (1)

Device for controlling the movements inside a multi-way valve, for driving a piston-cylinder unit, characterized in that a control rod (5) of a multi-way valve (4) which is actuated by the driver (6) of the vehicle, with an additional control rod (105) one Auxiliary device (7) is connected and the additional control rod (105) with a tubular body (24) is operatively connected, which is acted upon by a compression spring (22), and the tubular body (24) with a rotatable selection device (8) is operatively connected, and the tubular body (24) longitudinal grooves (33) and circumferential grooves (25, 26, 27) and in these grooves, a ball 28 can be introduced, which is arranged in a circumferential chamber (30) of a further tubular body (29), in is arranged radially outward position.

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