DE8010106U1 - Slide valve - Google Patents

Description

= 4.

A 80/20 A 631 E-St / Br 2.8.1983

10

Slide valve

The innovation relates to a slide valve of the type specified in the preamble of claim 1. at These slide valves with brake pistons are used when the hydraulic energy is consumed provided device is driven in the braking state, by throttling the flowing from the consumer Current to brake the device provided as a consumer in such a way that its speed of movement - corresponds to the current flowing in from the pump. One The difficulty here is to find a suitable one for the control of the brake piston on the respective discharge side To obtain pressure signal because on this side the pressure is relatively low, while on the other hand despite the Braking effect on the inflow side from the pump to the device intended as a consumer, the pressure is higher, but on both sides of the brake piston with regard to the desired control of both directions of movement Symmetry is supported against an equally strong spring. One in function and effect a good solution to this problem is known from DE-OS 2 6 ^ 7 14o. However, this solution requires

Shape. 5729 7.78

additional drilling in the housing.

The present renewal is based on the task ^ without such additional bores in the housing to create a valve assembly with brake pistons that provide constant braking the device provided as a consumer enables and prevents that this moves faster than that of corresponding to the current flowing into the pump, in order to

to prevent deficiency.
10

O This task is carried out by the characterizing part of the Claim 1 specified features solved.

Further advantageous refinements by means of which essential advantages are achieved are contained in the subclaims specified.

The innovation:. 'Is explained below with reference to the drawing.
20th

In the housing 1 a bore 5 is provided in which a valve slide 2 is displaceable. Coaxial to the / ν longitudinal axis of the valve slide 2 are in this two Bores 4 are provided, which are offset in a manner to be explained, with 4 in each of these bores Brake piston 5 is displaceable.

In the housing 1 Bind several channels are provided, as bores arranged radially to the bore 2 or as an annular cavity are arranged around the bore 3 around. Of these channels, channel 6 and channel 7 are the same as in the drawing no longer shown pump connected. The channel 8 is provided with one side as a consumer Device connected and the channel 9 is connected to the other side of this device. The Ka-

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^"1 lo ducts, 11 and 12 are connected Rait a drain line to an unpressurized container J. The channel is provided with a Ij5

Annular space around another in the drawing no longer shows - ': j posed hole connected, in which another, likewise

In the drawing, the valve slide, no longer shown, is displaceable in such a way that in the neutral position of this further slide, not shown, the channel 1J> is connected to the pump, while in the actuating positions this

Another slide the channel 15 is blocked. 10

• Q In the valve slide 2, an annular groove 14 is provided which in the neutral position of the valve slide J5 shown in the drawing connects the channel 15 with the channel 12. To-

: additional side bores 15 and 16 enable partial

'? ■ · ¹⁵ wise shift another throttled flow from

f channel 13 to channel 12.

A lateral bore 17 is provided in the longitudinal slide 2, which is connected to a laterally offset hole l8

²⁰ stands, from which a throttle bore 19 (with a diameter of 1 mm, for example) opens into the bore 4, specifically in an area of this bore 4 which is constantly in communication with the annular groove 2o in the brake piston 5.

Is offset in the circumferential direction with respect to the bore 17 a further bore 21 is provided in the longitudinal slide 2, from which a further bore 22 is also in the bore 4 opens. The bore 21 is provided in such a way that, when the longitudinal slide 2 is displaced, it exits the neutral position out in front of the wall of the hole 3 between the channels 7 and 9 or 6 and 8 is located.

In the brake piston 5, a further bore 2j5 extends radially from the annular groove 2o to an interior space 24, to the 35

Shape. 6729 7.78

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The longitudinal bore 26 via a further throttle bore 25 connected. The longitudinal bore 26 ends in the outer end face 27 of the brake piston 5.

Against a shoulder 28 of the brake piston 5 is a fader supported on the other hand against a stopper 3 ° braced. When the Brake piston 5 puts it with its end face against a port set 31 of the plug Jo, so that the Channel 26 is locked.

The bore 4 is designed as a stepped bore, the enlarged bore part J> k of which forms an annular surface 33 with the narrower part of the bore, against which the brake piston 5 rests with a valve seat surface 35. In front of this, an annular groove 36 is formed in the brake piston 5, through which the bores 37 and 38 in the longitudinal slide 2 can be connected to one another in the controlled state of the brake piston 5, wherein in the controlled state of the longitudinal slide 2 on the one hand, for example when displaced in the Drawing on the right, the bore 38 with the channel 11 and the bore 37 with the channel 9 and on the other side the bore 37a with the channel 6 and the bore 38a with the channel 8 according to the left in the drawing, it follows that the bore 38a with the channel lo, the bore 37a with the channel 8, the bore 37 with the channel 7 and the bore with the channel 9 in connection.

3Q in order to bypass the valve seat 33, 35 are in the Brake piston 5 two bores 39 and 4o, which are in communication with each other, are provided, and that are instead a straight through hole two holes are provided, the axes of which form an angle with each other, the forces that occur when flowing through are more favorable

Shape. 5729 7.78

-δι to shape.

The annular groove 2o is located on the circumference of the part 45 the gap formed by the brake piston 5 with the space 44 in front of the end face 4? of the brake piston 5 in connection. the end For manufacturing reasons, the end face is 4j on a plug part 42, which is screwed into the brake piston 5, formed. In the plug part 42 is a Longitudinal bore 46 is provided through a check valve ball 47 can be locked, this being supported against a spring 48. The space of 44 in front of the face 4j of the brake piston 5 is thus above the channel and the check valve 47, 48 with the space 24 in connection

binding.
15th

The mode of action is as follows;

When the longitudinal slide 2 is actuated, it is on the pump inflow side the bore 17 with the channel 7 in connection, so that pressure medium from the pump via the channel 7 ,, the Bore 17, the bore 18, the throttle valve 19, the bore 2; 5, the space 24, the further throttle point 25 and the longitudinal bore 26 to the space in front of the end face 27 of the communicating with a pressureless drain Brake piston 5 flows. As a result of the choke points 19 and 25 connected one behind the other, there is thus a choke chain formed, the space 24 between the two throttle points 19 and 25, so that the pressure in the Space 24 by the ratio of the widths of the two throttling points 19 and 25 is formed. It is assumed that the two throttle points 19 and 25 are approximately the same size are, then the pressure in the space 24 is about half as great as the pressure in the channel 7 · the pressure in the space 24 prevails, but also prevails in the annular groove 2o and thus divides over the gap on the circumference of the part 4-5

Shape. 5729 7.78

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the space 44 with, so that by the effect of the pressure on the end face 43 of the brake piston against the force of Spring 29 is moved. The throttling effect in

! the gap at the part 45 is the sliding movement

! 5 shift against the force of the spring 29 damped. The ι displacement movement of the brake piston in the direction of the Schlles-

sens on the valve seat 33, 35 can, however, take place very quickly, since it takes effect during the displacement in this direction the force of the spring 29, the check valve 47 opens and thus the in the space 44 in front of the end face 43 / \ Lent liquid very quickly through the check valve can flow into the space 24 and from this through the longitudinal bore 26, the throttling effect of the throttle point is much less than the throttling effect at the gap on Part 45.

Providing poppet valves in connection with longitudinal slides is known per se, usually such poppet valves are used to enable a more tight seal than is possible with a cylindrical slide in a cylindrical bore with a gap that enables jamming-free displacement. In the case of the use of a seat valve provided here, however, the goal is different. ■ \ - If, instead of a seat valve, the usual

If only one edge is provided on a bore and one edge at the transition from the annular groove 36 to the now considered cylindrical part of the brake piston 5, the brake piston 5 would have to dip quite deeply to achieve a sealing effect in order to produce a sealing effect _f with the further consequence that when opening the brake piston 5 would have to cover quite a distance and quite a time elapses for this covering of the path until the edge of the annular groove 36 is released. By using the design as a seat valve, the dead time is also significantly reduced.

Shape. 5729 7.78 - "*

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The use of the choke chain formed from the choke points 19 and 19 not only enables a to get a steady signal, but it is also possible to also use the face of the on each side as the drainage side to achieve a higher control pressure on the controlled side, as on the inlet side connected to the pump, so that a lack of filling for consumers is avoided. The goal, a steady braking of the consumer enable and prevent a lack of filling in this * is reached safely in this way. In addition, it can be easily accommodated in the control valve.

In contrast to the outflow side from the consumer, on which the mentioned effect is achieved, on the inflow side to the consumer, the pressure medium flow through the further bore 22, so that the throttling effect in the Throttle bore 19 *, which is connected in parallel to the further bore 22 on the inlet side, does not have any effect comes with the further consequence that a smaller pressure gradient is required on the inflow side for opening is.

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LINDE AKTIENGESELLSCHAFT

P 30 14 202.0 A 80/20

DP-St / Aa

summary

Slide valve 10

Slide valve for connecting a pump with one preferably switchable consumer with an annular groove on the slide, which in its neutral position the pump with a Drain line connects, with one setting of the

15th

Slide the pump is connected to a supply line to the consumer and at the same time a return line of the consumer is connected to a drain line, the slide having an axial bore in which one to throttle the flow from the consumer to the drain

20th

Serving brake piston displaceable against the force of a spring is, which in turn has an annular groove, which in one position of the brake piston cross bores in the slide with one another connects, one of which with the return line

and the other is connected to a drain line where-25

at to enable a steady braking of the consumer and to prevent the latter from moving faster than the supplied current in the braking state, in the inflow bore a throttle point is arranged in the slide

and a throttle point is arranged in the brake piston, where -30

in the space in the pressure medium flow acting on the brake piston lies between the two throttle points.

35

Shape. 672 «7.78

Claims (1)

A 651 A 80/20 Έ-st / Le 2.8.1983 " 10 Protection claims f ¹⁵ I. Slide valve, in particular as part of a block control device »with a longitudinal slide, which is located in a bore, to which inflow and outflow channels are connected radially to this, to control the connection between a pump and a pressure energy consumer, preferably switchable in both directions, which drives a consumer of mechanical energy, which is able to deliver mechanical energy in certain operating states, whereby (! the longitudinal slide has an annular groove which, in the neutral position of the longitudinal slide, connects an annular space connected to the pump in the housing surrounding the longitudinal slide with a channel connected to a drainage line and can be displaced from this neutral position into at least one position, in which _{it is} through the longitudinal slide The channel connected to the pump is connected to a channel in the housing connected to the supply line to the consumer and, at the same time, a channel connected to the return line of the consumer is connected to the drain line through the longitudinal slide, wherein Shape. 5729 7.78 ■ Oil * t (i— t · · ι 1 In an axial bore of the longitudinal slide a to Throttling the current from the consumer to the drain serving brake piston against the force of a spring ver-I Slidably arranged and on one face of I 5 can be pressurized, wherein the space flows to the pressure fluid through a longitudinal slide in Zuflußbohrung% prior to this end face and said brake piston 1 is also, in turn, has an annular groove, if the in the shifted against the force of the spring I -jo position of the brake piston, cross holes in the longitudinal slide I -. about connects with each other, one of which when postponed yyy: ^w Position of the longitudinal slide one with the return line ί from the consumer and the other with a I holder connected channel is connected, thereby I 15 indicates that a throttle point (19) arranged in the Zuflußbohrung (17, 18) f. The longitudinal slide (2) Ί and that in the brake piston (5) in the further stream of the \ pressure flowing through the inflow bore (17, 18) I medium flow another throttle point (25) is arranged I 20 ^{net and that the} end face ( ² KJ) • of the brake piston (5) is applied from a space (24), which lies in the aforementioned pressure medium flow between the two throttle points (19 and 25). 25 2. Slide valve according to claim 1, characterized in that that the connection between the space (24) in front of the second Drosselstelll ^ and the space (44) in front of the end face ; (45) of the brake piston (5) through a gap on the circumference of the brake piston (5, 45) is formed. 30th 3. Slide valve according to claim 1 or 2, characterized in that the space (24) in front of the second throttle point is connected to the space (44) in front of the end face (43) of the brake piston (5) by a second connecting _{channel 35} (46), in which one to the room (24) in front of the Shape. 5729 7.78 III .11 (i · · ■ I • Ι non-return valve opening the second throttle point (25) (47) is arranged. 4. Slide valve according to claim 1, characterized in that the rear edge in the closing direction (35) of the annular groove (36) of the brake piston (5) than with the annular surface (33) is designed in the longitudinal slide (2) cooperating valve seat (35 * 33). 5 «slide valve according to claim 4, characterized in that that as bypassing the valve seat (33, 35) in the brake piston (5) at least one bypass line (39, 40) arranged 1st. 6. Slide valve according to one of the preceding claims, characterized in that a further bore (22) is arranged in the longitudinal slide (2) in such a way that it. on the side controlling the inlet fcum consumer is connected in parallel to the throttle point (19). 20th 25th 30th 35 Shape. 5729 7.78 1 I I ti