CN1908453A

CN1908453A - Hydraulic valve device

Info

Publication number: CN1908453A
Application number: CNA2006101059686A
Authority: CN
Inventors: 索尔基尔德·克里斯坦森; 西格弗里德·曾克
Original assignee: Sauer Danfoss ApS
Current assignee: Danfoss Power Solutions ApS
Priority date: 2005-07-19
Filing date: 2006-07-19
Publication date: 2007-02-07
Also published as: DE102005033577A1; BRPI0602806A; DE102005033577B4

Abstract

The present invention relates to a hydraulic valve arrangement includes: a supply connecting device, having a entry connecting and an exit connecting; a service connection device, having at least a service connection; a control valve locating between the connection device and the service connection device and having a slider; and at least a break valve between the control valve and the service connection, which can be turned on through the guide valve braking mechanically and the guide valve has a braking element interactionally with the valve unit and the control surfaces of the slider acts on the braking element to simplify the braking action of the valve arrangement at pains. Thereby, the braking element (24) is disposed near the slider (4) in the direction of motion (28) of the slider (4) and horizontally deflects in the direction relative to the direction of motion (28) of the slider (4).

Description

Fluid pressure valve device

Technical field

The present invention relates to fluid pressure valve device, it comprises: supply with connection set, comprise that the inlet connection is connected with outlet; The work connection set has at least one work and connects; Control valve is being supplied with between connection set and the work connection set, and is being comprised slide block; With at least one stop valve, between control valve and work connection, stop valve can be opened by the pilot valve of mechanical braking, and this pilot valve has and the interactional braking member of valve element, and the chain of command of slide block affacts on the braking member.

Background technique

Such control valve unit (for example) is used to control the purpose of oil hydraulic motor.This motor (for example) can be the piston/cylinder unit of lifting load.For the load that guarantees to mention remains on certain position, can use stop valve, it guarantees that hydraulic fluid can not flow into or flow out this control valve unit under the control corresponding not having.In a similar fashion, such control valve unit can also be controlled another hydraulic pressure user, and it can press or draw load.

When control valve unit control user, must open stop valve.For this reason, known use has the pilot valve of hydraulic pressure opening.Yet this unlatching requires hydraulic pressure.When losing hydraulic pressure, for example when the drive motor that drives working machine or tractor broke down, this hydraulic pressure user will no longer can be braked.For example, load possibly can't be reduced to safe position.

Therefore, the pilot valve opened by the machinery of slide block braking has been proposed.

DE 4028887 C2 have showed the fluid pressure valve device as mentioning in the brief introduction.Each work connects and to have the stop valve that can be opened by pilot valve.Pilot valve has the braking member that is inducted in the shell, and the top of this braking member is parked on the slide block.For each braking member, slide block has conical chain of command.When displacer, to top offset, slide block is along its axial displacement simultaneously on the taper chain of command that tilts on the top of braking member.

Similarly embodiment can learn from DE 10325294 A1.Here, pilot valve separates with stop valve.

There is drawback in such embodiment, and promptly when pilot valve was braked, bigger external force affacted on the slide block.This has caused serious wearing and tearing.The required active force (overcoming hydraulic coupling and spring force) of open guidance valve radially affacts on the slide block with the mode ground that does not reduce.Especially for electrical braking, the frictional force that produces in this mode has the adverse effect that is caused by big hysteresis.

US 3854499 has showed fluid pressure valve device, wherein directly opens stop valve by slide block.Stop valve has the valve element, and it provides the braking member that is parked on the slide block.When slider displacement, braking member tilts, therefore the mode deflection valve element to lift from from valve seat.Adopt present embodiment, the power that acts between braking member and the slide block is less.Yet,, need different power according to the different direction of slider displacement.Under worst situation, slide block may cause braking member to be stuck on the slide block in the displacement on the closing direction.

Summary of the invention

The present invention is based on the task of simplifying the braking in the fluid pressure valve device.

Adopt the fluid pressure valve device of mentioning among the present invention, this task is so solved, promptly on the moving direction of slide block, braking member is positioned at and the slide block position adjacent, and can lateral deflection on the moving direction of slide block.

When slider displacement, the valve element is lifted from from valve seat.And this motion also is yaw motion, because the valve element is connected with the braking member substantially rigid.Thereby, need less relatively power to open pilot valve.The valve element no longer is parked on the slide block.In the motion of slide block, the risk that braking member is stuck on the slide block by any way is less.Therefore, the wearing and tearing of the contact segment between braking member and the slide block keep less.On each moving direction of slide block, the frictional force between slide block and the braking member is basic identical.

Preferably, the longitudinal axis of the longitudinal axis of braking member and slide block is arranged to mutually disjoint.For example, braking member manufactures bar-shaped.In this situation, the longitudinal axis has formed excellent central shaft.Be arranged to when non-intersect when two longitudinal axis, do not have the risk that applies big active force on the surface of contact of braking member and slide block.

Particularly preferably be, braking member forms tangent line for slide block.Therefore the maximum diameter of slide block with resultant action on braking member, thereby guaranteed optimum power transmission.

Preferably, the moving direction side direction of the relative slide block of pilot valve biasing.Its advantage is, braking member, and and then acts on the pilot valve on the valve element along linear function.When the location for pilot valve provided bore hole (bore), this bore hole can be made on traditional Boring machine, and without any need for the inclination bore hole.

Preferably, the valve element is around the yawing axis deflection of the outside of edge that is positioned at sealing area or sealing area.Therefore, the sealing zone from this deflecting region separately.The repetition deflection of this valve element causes the risk of wearing and tearing or damage therefore to keep less for the sealing zone.This pilot valve can keep the tight a very long time, and it has also caused the tight of stop valve.

Preferably, the valve seat that valve element and gap center on interacts, and valve element side direction on valve seat is outstanding.In this case, in fact yawing axis is formed by the radially outward edge of valve seat or the radially inward edge in gap.Only produce friction at this.Otherwise this valve seat keeps " closely ".

Preferably, the valve element imports in the bore hole, and its diameter is corresponding to the maximum diameter of valve element, and the valve element has peripheral restriction, and it reduces gradually away from valve seat circular cone ground.Therefore, on the one hand, guaranteed that the valve element always is parked on the valve seat with correct direction.On the other hand, make the inclination of the relative valve of valve element.

Another advantage is that pilot valve is arranged in the pilot valve shell that is installed on the control valve shell.In this case, do not need a large amount of modifications of control valve.

Also have an advantage to be, chain of command is positioned on the extension part of slide block, in this case, comprises that the slide block that is used for controlling required groove of other hydraulic pressure and annulus can remain unchanged.The extension part of slide block provides the control pilot valve required exceptional space.

Preferably, to act on the distance between the valve seat of position on this braking member and pilot valve be 10 times of seat f radii to slide block at least.Therefore, provide big relatively torque, thereby when high relatively pressure affacted on the valve element, pilot valve can be opened with relatively little power on closing direction.

Preferably, this valve element side of this valve seat dorsad has outstandingly, and it presses closing spring in the yaw motion of valve element.The closure of valve element or Returnning spring always need under many circumstances.At this moment, when raised sides pressed this Returnning spring, the closure of pilot valve also was subjected to the influence of a force component, and this force component is on the direction of reverse deflection.The valve element is parked on this valve seat then, has the reliability of increase.

Another advantage is, two work connect each all provide stop valve, wherein each can be opened by mechanically activated pilot valve, the braking member of two pilot valves and slide block are at shared regional interaction.Then, the braking action of pilot valve is fit to each other in simple mode.The work of slide block is simplified.

Preferably, on the moving direction of slide block, braking member is arranged to offset with respect to each.In this case, only open a pilot valve, another then keeps closing, and this is the comparatively safe pattern of control valve unit operation.

Another advantage is, slide block has groove, on the moving direction of slide block, define by two chains of command, and in the neutral position of this slide block, the adjacent chain of command setting of braking member, and adjacent another chain of command of another braking member is provided with.When each braking member actual contact when each chain of command, had the small movements of a slide block can start the unlatching of desired pilot valve.When distance is big, before the unlatching that starts pilot valve, allow the small movements of slide block.

Description of drawings

Below, based on preferred embodiment the present invention is described in conjunction with relevant drawings:

Fig. 1, Figure 1A-1D fluid pressure valve device schematic representation

The different cross section figure of Fig. 2 A-2D control valve unit

Fig. 3 explains the view of braking member position

The modification embodiment of Fig. 4 pilot valve

Embodiment

Fig. 1 is the schematic representation of fluid pressure valve device 1, also can be called control gear.This control valve unit 1 comprises supplies with connection set 2, and it has inlet connection P and is connected T with outlet, and connecting P by inlet can provide hydraulic fluid.Supplying with connection set 2 is connected with control valve 3.Control valve 3 also has slide block 4.

In addition, this control valve unit comprises having the work connection set that two work connect A, B, and it can be connected with the hydraulic pressure user 5 (for example piston/cylinder unit) that signal only provides.

Between control valve 3 and work connection A, be provided with first stop valve 6.Between work connection B and control valve 3, be provided with second stop valve 7.

Stop valve

6,7 all is made for the form of one-way valve, and promptly they have stop valve element 8,9, and it presses under the influence of stop valve spring 10,11 by valve seat 12,13, has therefore stopped from work to connect A, the B fluid path to control valve 3.

On the direction of closing, each stop valve element 8,9 is subjected to the effect of the pressure in the cavity 14,15, and it is connected A, B by throttle valve 16,17 with work and connects.

Each stop valve element 8,9 connects A in work, the B place has the pressure that is exposed to pressure and applies face 18,19, and the pressure that described surperficial 18,19 size is equal to or greater than in cavity 14,15 applies face.When the pressure in cavity 14,15 reduces, act on pressure and apply active force that the pressure on the face 18,19 causes active force, and stop valve element 8,9 is from lifting from by valve seat 12,13 greater than spring 10,11.

In order to reduce the pressure in the cavity 14,15, each

stop valve

6,7 provides pilot valve 20,21.Two pilot valves 20,21 have identical design, make explanations for pilot valve 20 below.

Pilot valve 20 has and valve element 23 interactional valve seats 22, and valve element 23 loads to it to the direction of valve seat 22 by the effect of closing spring 31.Valve element 23 is rigidly connected with braking member 24 on the slide block 4 that extends to stop valve 3.In this connects, braking member 24 relative slide block 4 side direction biasings, promptly braking member 24 is supported on the circumference of slide block 4 tangently.This has guaranteed that the longitudinal axis of braking member 24 and the longitudinal axis of slide block 4 extend in the mode that mutually disjoints.

Fig. 1 has showed the closed situation of pilot valve 20,21.Shown in Figure 1A, this makes the braking member 24 of two pilot valves 20,21 can be arranged in the undergauge of slide block 4 (diameter reduction) 25, makes undergauge 25 define by chain of

command

26,27 on its both sides on the moving direction 28.At this moment, when the slide block shown in Figure 1B and Fig. 1 C 4 displacement, straight to external pressure slide block 4, and therefore also around yawing axis 29 deflections, the longitudinal axis 30 of itself and slide block 4 extends in parallel by chain of command 27 for two braking members 24.This yawing axis 29 can be very short, thereby in theory when this valve element 23 is annulus, it can make inflexion point.When valve element 23 and braking member 24 were rigidly connected, valve element 23 also was deflected, and therefore lifted from from valve seat 22.

In the embodiment of Figure 1A and 1C, undergauge 25 on the moving direction of slide block 4, have with braking member 2 in the corresponding length of extension part that this side up.Therefore, pilot valve 20,21 moving direction that is independent of slide block 4 is opened simultaneously.If desired, must connect the additional one-way valve that provides in P place at inlet.

Fig. 1 D has showed an embodiment, and wherein the undergauge 25 of slide block 4 is for bigger.Braking member 24 is provided with mutual biasing on moving direction 28.Each braking member 24 is adjacent with the chain of command 27 that distributes separately, thereby the motion of slide block 4 on moving direction only can cause opening a pilot valve 20,21.

Can also see that two pilot valve 20,21 side direction adjacent sliders 4 are provided with, thereby in the neutral position of slide block, two braking elements 24 extend parallel to each other.

Fig. 2 has showed the different cross section figure of the practical embodiments of control valve unit 1.Fig. 2 A has showed the cross section C-C according to Fig. 2 C.Fig. 2 B has showed the section A-A according to Fig. 2 A, and Fig. 2 C has showed the section B-B according to Fig. 2 b.Fig. 2 D has showed the embodiment according to the slide block braking action of Fig. 1 once more, and wherein the displacement of slide block 4 only causes the deflection of a braking member 24.Yet another braking member remains on stand, thereby its corresponding pilot valve 21 remains closed.

Control valve unit 1 according to Fig. 2 has control valve shell 32, wherein is provided with slide block 4.Similar elements has same reference numerals as shown in fig. 1.

Two pilot valves 20,21 are arranged in the pilot valve shell 33, and its flange is received on the control valve shell 32.In order to start two pilot valves, slide block 4 provides extension part 34.Then, undergauge 25 is arranged in the extension part.

Through being formed on the

pipe

35,36 on the control valve shell 32, each pilot valve 20,21 is connected with stop valve 6,7.As especially obvious from Fig. 2 C, pilot valve 20,21 is arranged in the

bore hole

37,38, the longitudinal axis 30 lateral offset of the relative slide block 4 of described bore hole.Position as the bore hole from Fig. 2

b

37,38 can see that two pilot valves 20,21 all are arranged to offset with respect to each on the moving direction 28 of slide block 4.Therefore, can unlatching independent of each other and closed two pilot valves 20,21.

In enlarged view, Fig. 3 has showed the position of braking member 24 relative slide blocks 4 once more.Can see that the braking member 24 shown in Fig. 3 left side is positioned at the front of slide block 4 on direction of observation, thereby the braking member 24 shown in Fig. 3 right side is positioned at the back of slide block 4 on direction of observation, thereby its part is covered by slide block 4.

Fig. 4 has showed the modification embodiment of pilot valve 20,21, and pilot valve 20 is shown in the enable possition, and pilot valve 21 is shown in operating position.Similar elements has the same reference numerals as shown in Fig. 1 and Fig. 2.

In the embodiment according to Fig. 4, valve seat 22 is centered on by annular groove 39.Therefore in fact, during the deflection of braking member 24, valve element 23 is tilted on the edge 40 of valve seat 22.Therefore, it can guarantee not produce by repeating the sealing area of wearing and tearing between valve seat 22 and valve element 23 that banking motion causes, but this sealing area or even outer generation the in this zone wear and tear.For identical tilt angle, discharged bigger flow cross section, and reached safe closed state.

Employing is according to the embodiment of Fig. 1 to Fig. 2, and valve element 23 has the shape of circular cone, thereby under the influence of closing spring 31, it compresses into valve seat 22 from the center.May omit this feature this moment.

Alternatively, valve element 23 has outer diameter, and it is the inner diameter corresponding to

bore hole

37,38 at valve element 23 places.This outer diameter need not to be closed into the form of ring.It also can be realized with the projection 41 of star around valve element 23 by some.By this projection 41 (certain or another respective embodiments), valve element 23 is directed with placed in the middle in bore hole 38.

Yet valve element 23 diminishes away from valve seat 22 circular cone ground, thereby as can see that from the valve element 23 of pilot valve 20 this valve element 23 still may the enough angles of deflection.Fluid then can pass through the Clearance Flow between the projection 41, and leaves by the gap between valve seat 22 and the valve element 23.

In a side of valve seat 22 dorsad, valve element 23 has the projection 42 that outer diameter equals the inner diameter of closing spring 31.

At this moment, when deflection valve element 23, closing spring 31 at least not only is pressed on the side.Projection 42 is lateral deflection closing spring 31 a little also.Therefore, affact on the valve element 23 from the active force of closing spring 31, this active force not only is pressed against valve element 23 on the valve seat 22, but also applies little component in the direction of deflection on valve element 23.

The embodiment that can depart from displaying in every way.Enter into chamber 14,15 when corresponding pressurized hydraulic fluid can connect A, B from work by another kind of mode, also can not must throttle valve 16,17 in the stop valve element 8,9.

The braking member 24 of pilot valve 20,21 be arranged in parallel.Yet, but also angulation between the two braking elements 24, as long as it seems that from the viewpoint of design this can provide benefit.

When the pilot valve 20 of entrance and exit is opened simultaneously (Fig. 1 a is to 1c), the total length of braking curve and control valve unit 1 is for the shortest.When generally having only port opening, total length increases to some extent.

In order further to reduce closing time, between chamber 14,15 and outlet, provide one-way valve 43,44, thereby chamber 14,15 can refill with hydraulic fluid.If desired, the embodiment of modification can predict one-way valve 43,44 and is connected with the chamber that aux. pressure is wherein arranged.

Claims

1, a kind of fluid pressure valve device comprises:

Supply with connection set, comprise that the inlet connection is connected with outlet;

The work connection set has at least one work and connects;

Control valve is arranged between this supply connection set and this work connection set, and comprises slide block; With

At least one stop valve, between this control valve and work connection, stop valve can be opened by the pilot valve of mechanical braking, and this pilot valve has and the interactional braking member of valve element, and the chain of command of this slide block affacts on this braking member,

It is characterized in that on the moving direction (28) of this slide block (4), adjacent this slide block of this braking member (24) (4) is provided with, and this moving direction (28) lateral deflection of this slide block (4) relatively.

2,, it is characterized in that the longitudinal axis (30) of the longitudinal axis of this braking member (24) and this slide block (4) is arranged to mutually disjoint according to the control valve unit of claim 1.

3,, it is characterized in that this braking member (24) forms tangent line for this slide block (4) according to the control valve unit of claim 2.

4,, it is characterized in that this pilot valve (20,22) is arranged to relatively this moving direction (28) side direction biasing of this slide block (4) according to the control valve unit of one of claim 1 to 3.

5, according to the control valve unit of one of claim 1 to 4, it is characterized in that this valve element (23) around yawing axis (29) deflection, it is positioned at the edge or the outside of sealing area.

6, according to the control valve unit of claim 5, it is characterized in that this valve element (23) and the valve seat (22) that is centered on by gap (39) interact, it is outstanding that this valve element (23) is gone up side direction at this valve seat (22).

7, according to the control valve unit of claim 5 or 6, it is characterized in that this valve element (23) is inducted in the bore hole (37,38), its diameter is corresponding to the maximum diameter of this valve element (23), and this valve element (23) has peripheral restriction (41), and it reduces gradually away from this valve seat (22) circular cone ground.

8, according to the control valve unit of one of claim 1 to 7, it is characterized in that this pilot valve (20,21) is arranged in the pilot valve shell (33), it is installed on the control valve shell (22).

9,, it is characterized in that this chain of command (26,27) is arranged on the extension part (34) of this slide block (4) according to the control valve unit of one of claim 1 to 8.

10,, it is characterized in that it is 10 times of this valve seat (22) radius at least that this slide block (4) affacts distance between the valve seat (22) of position on this braking member (24) and this pilot valve (20,21) according to the control valve unit of one of claim 1 to 9.

11, according to the control valve unit of one of claim 1 to 10, it is characterized in that this valve element (23) dorsad this side of this valve seat (22) have outstanding (42), it presses in the yaw motion of this valve element (23) closes spring (31).

12, according to the control valve unit of one of claim 1 to 11, each that it is characterized in that these two work connect (A, B) provides stop valve (6,7), its each can open by the pilot valve (20,21) of mechanical braking, this braking member (24) of these two pilot valves (20,21) interacts in shared zone (25) with this slide block (4).

13,, it is characterized in that this braking member (24) is arranged to offset with respect to each on this moving direction (28) of this slide block (4) according to the control valve unit of claim 12.

14, according to the control valve unit of claim 13, it is characterized in that this slide block (4) has groove (25), on the moving direction of this slide block (4), define by two chains of command (26,27), in the neutral position of this slide block (4), the adjacent chain of command of a braking member (24) (26) is provided with, and this adjacent another chain of command of another braking member (24) (27) is provided with.