CN1756917A

CN1756917A - Directly controlled pressure control valve

Info

Publication number: CN1756917A
Application number: CNA2003801100030A
Authority: CN
Inventors: 京特·克伦策; 彼得·劳尔; 卡尔-约瑟夫·迈尔
Original assignee: Bosch Rexroth AG
Current assignee: Bosch Rexroth AG
Priority date: 2003-02-26
Filing date: 2003-11-14
Publication date: 2006-04-05
Anticipated expiration: 2023-11-14
Also published as: DE10312672A1; ATE434144T1; DE50311620D1; CN100532899C

Abstract

The invention relates to a directly controlled pressure control valve comprising a seat piston (6) in a longitudinal borehole (8) of a valve housing (4), said piston being radially guided in the longitudinal borehole, in its guiding region, by means of two peripheral interspaced guiding elements (36).

Description

Directly control relief valve

Technical field

The present invention relates to a kind of as described in the preamble direct control relief valve according to claim 1.

Background technique

A kind of such relief valve (DBV) is shown in Figure 1.The DBV shown in the there produces from applicant's record chart RD 18 016-3.01/01.98.Fig. 1 illustrates DBV 2, is included in the seat piston 6 that is directed in the valve pocket 4.Seat piston 6 is received in vertical boring 8 and by spring 10 bias voltages and leans against valve seat 12, so that the hydraulic oil that blocks from inflow side working interface A to outflow side working interface B connects.Seat piston 6 vertically is being provided with radial clearance in the boring 8.Receive seal ring 34 in the circumferential groove 38 of present piston 6, it leans against on the inner peripheral wall of vertical boring 8 hermetically.

Shortcoming in this solution is that the seat piston is rotated or pivot movement along the longitudinal direction around seal ring in open position.

Owing to the contact chatter that wherein produces, a seat piston bears high mechanical stress, thereby reduces the working life of this DBV.

And this contact chatter is converted into the operation such as the noise beastly and the prevention low noise of flute song.

Summary of the invention

Task of the present invention is, a kind of direct control relief valve is provided, and it can eliminate above-mentioned shortcoming and can be with the low cost manufacturing.

This task is by having the direct control relief valve solution according to the feature of claim 1.

The valve pocket that has the working interface that has inflow side and outflow side according to relief valve of the present invention (DBV).In valve pocket, seat piston bias voltage leans against on the valve seat.According to the present invention the seat piston in guiding area at least by two apart from one another by the circumference of present piston on the circular director element that is provided with of annular be supported in the valve pocket.

In solution of the present invention advantageously, at least---two director elements---are directed in vertical boring of valve pocket the seat piston by two " bearings ", so the seat piston can not cause being rotated or pivot movement around its longitudinal shaft, and does not therefore cause vibration when opening DBV.Suppress contact chatter.

And be according to the advantage of DBV of the present invention, realized the damping in axial direction of seat piston by two director elements.

The seat piston does not have the axial stop that axial restraint seat piston is opened stroke.The maximum stroke of opening is determined by the compression of spring.In order to protect director element; vertically boring is radially being widened by flat inclined-plane in the exit region of spring chamber; make the director element that enters not be damaged when return course, described director element enters spring chamber and turns back to during shutoff stroke in vertical boring in favourable modification.

Director element is the O V-shaped ring in a preferred embodiment, for example has shear strength A in 90 scope.

In one embodiment, pressure oil can turn back to spring chamber from the outflow side working interface through the boring in the present piston, so the pressure that exists in spring chamber is basically corresponding to the pressure of outflow side working interface.At least one is opened by matching gap or by cross section towards the lateral bore of the working interface of outflow side in the bias voltage position of rest in this case, yet the cross section that it is opened can controllably be closed according to the stroke of opening of seat piston, so pressure oil stream no longer passes lateral bore, but only crosses the annular space.

For the stable base piston, director element is apart from one another by far away as much as possible, and wherein preferably first director element is arranged near the lateral bore and second director element is arranged on vertical boring near the exit region of spring chamber.

In order to reduce retardation phenomenon, be provided with the turning circular groove between the director element of the present piston of another embodiment, so can the seat piston not carried out grinding.

In another embodiment,, on the outflow side, form reservoir in order to obtain the response characteristic that DBV improves, its form be have the hoop end face the seat piston radially to returning ladder.Reservoir is limited by valve seat and annular end face in the axial direction.In position of rest, pressure oil can be present and be flowed along the direction towards the outflow side working interface from reservoir on the piston.Explanation in the German patent application 102 60 662.5 of such reservoir before the claimant.

Other favourable structural types are themes of other dependent claims.

Description of drawings

Explain the preferred embodiment of the invention according to schematic figures below.Wherein:

Fig. 1 illustrates the longitudinal sectional view of the known solution of passing relief valve;

Fig. 2 illustrates the longitudinal sectional view that passes the preferred embodiments of the present invention;

Fig. 3 illustrates the longitudinal sectional view of seat piston according to the present invention among Fig. 2;

Fig. 4 illustrates the zoomed-in view of the regional X of Fig. 2.

Embodiment

Fig. 2 illustrates the cutaway side sectional view according to the preferred embodiment of directly actuated relief valve of the present invention (DBV) 2.DBV 2 has the valve pocket of being made up of many parts 4 that comprises vertical boring 8, received block piston 6 slidably in above-mentioned boring.Seat piston 6 is biased into its position of rest by spring 10, leans against on the valve seat 12.Spring 10 is arranged in the spring chamber 14 and passes through biased member 16 can regulate bias voltages.

Valve pocket 4 has spring chamber shell 18 and seat piston shell 20.18 restrictions of spring chamber shell are used to receive the spring chamber 14 of spring 10 and are threadably engaged with seat piston shell 20 and link to each other.In spring chamber 14, spring 10 supports by the end portion 72 on the bias voltage lid 60 of biased member 16.Second end portion, 62 springs by it are on the spring cup 24 of a piston 6.

Biased member 16 is arranged in the back region of spring chamber shell 18.Next door biased member 16 at bias voltage lid 60 and spring 10 has bias voltage screw 64, and it passes, and spring chamber shell 18 extends and it impacts on the bias voltage lid 60 from behind.For the bias voltage of determining to regulate, in the outside of spring chamber shell 18, lock nut 66 effectively meshes with bias voltage screw 64.

In the present piston shell 20, the outflow side that is formed with vertical boring 8 and and be positioned at the axial working interface A of inflow side when observing and is used to be connected the service line (not shown) from valve seat 12 is working interface B radially.Vertical boring 8 direction of working interface A is vertically opened.Vertically boring 8 is connected with the star drill hole structure with working interface B radially by a plurality of equally distributed radial bores 22.Valve seat 12 is formed in the seat piston shell 20 in vertical boring 8 between working interface A, B.

Vertically boring 8 is radially widened by four

ladders

26,28,30,32 along the direction of spring chamber 16.First ladder 26 forms and is used as formation valve seat 12 between two working interface A, B.In the position of rest of the bias voltage of the present piston 8 of second ladder, 28 usefulness, the impact spring that is used to receive spring cup 24 and spring 10 covers the end portion 62 of 18 back.Third and

fourth ladder

30,32 is used to receive spring chamber shell 18.

Seat piston 6 surpasses working interface B radially in its guiding area outflow side by two circles apart from one another by director element 36 be guided in vertical boring 8.In described embodiment, director element 36 is O V-shaped rings, the inner circumferential portion 40 that they are received in the circumferential groove 38 (Fig. 3) of a piston 6 respectively and contact is positioned at vertical boring 8 on opposite hermetically.

By use at least two apart from one another by director element 36, guarantee by two " bearing " on the stroke in vertical boring 8 guide seat piston 6 like this, thereby stop or reduce to a certain extent the rotation and the pivot movement of a piston 6, and the more difficult basically piston 6 that makes vibrates.In this case, the distance between director element 36 is big more, and the radially-directed of seat piston 6 is good more so.Except support function radially, director element 36 also has axial damping function.The material of director element 36 is so selected, and on the one hand reaches optimum support effect and damping, yet on the other hand by the frictional force minimum on the present piston 6 of director element 36 effects, makes the response characteristic optimum of DBV 2.In the above-described embodiment, select to have the fluorine rubber of shear strength A in 90 scope as material.

Seat piston 6 is provided with turning circular groove 42 (Fig. 3) between director element 36.By this turning circular groove 42, it preferably is formed between the director element 36 central authorities, increases the radial distance of seat piston 6 between the inner circumference area 70 of the outer circumferential area between its director element 36 76 and opposite vertical boring 8.Therefore, reduce the inclination of a piston 6 or the danger of friction, so reduce the retardation phenomenon of DBV 2.

Seat piston 6 does not have the axial stop that energy axial restraint seat piston 6 is opened stroke.The maximum stroke of opening is determined by the compression of spring 10.In order to protect director element 36 not to be damaged, vertically to hole and 8 in the exit region of spring chamber 14, radially widening by flat inclined-plane 82, described director element enters spring chamber 14 and turns back to during shutoff stroke in vertical boring 8.And shallow inclined-plane 82 automatically causes a piston 6 to be positioned in the vertically boring 8 during return movement.

In the inflow side or when radially working interface B upstream observes, pedestal 6 is radially to back-shaped one-tenth ladder, so that form reservoir 44 (Fig. 4) between seat piston 6 in vertical boring 8 and the seat piston shell 22.This forwards the conical surface 68 of end face side to the staircase areas of returning, and it is located on the valve seat 12 in the position of rest of bias voltage.Reservoir 44 by valve seat 12 and by seat piston 6 radially to returning annular end face 52 restrictions that ladder produces, this annular end face constitutes seat piston edge 46 or guiding valve edge.Reservoir 44 (Fig. 4) 22 is opened to radially holing by the fan-shaped flow section 48 between present piston edge 46 and seat piston shell 20 radial bores 22 internal edges in closed position.Advantageously, seat piston edge 46 and radial bore 22 make to face toward hydraulic oil appears discharging in annular end face 52 (Fig. 3) along seat piston 6 axial flow apart from valve seat 12 or the axial certain distance of working interface A.

When seat piston 6 rose from valve seat 12, reservoir 44 and annular end face 52 be together as being used for a piston 6 stroke auxiliary devices, thus can realize the response characteristic of DBV most of with open stroke and therefore with the spring path independence.For the detailed explanation of reservoir 44 operations, please refer to the applicant's German patent application 102 60 662.5 in the past.

In the present piston 6, constitute the axial drilling 54 (Fig. 3) of blind hole mode, it is opened and feeds at least one lateral bore 56 in the valve seat side to spring chamber 14.Therefore the pressure that exists at working interface B place, outflow side can be drawn and be present in the spring chamber 14.Preferably, lateral bore forms as the star drill hole.In the position of rest of bias voltage, lateral bore 56 is opened to outflow side working interface B, yet along with the increase of opening stroke, it closes (Fig. 4) towards the open cross-section of working interface B by the control edge 58 of vertical boring 8.Form fan-shaped in the section part of control edge 58 by radial bore 22 and the vertical boring 8 present piston shells 20.After closing, hydraulic oil between radial bore 22 and lateral bore 56 only flows by narrow annular space 80, so strengthened the damping of seat piston 6, extended to the control edge 58 of vertical boring 8 between the excircle 84 of the present piston 6 in described annular space and 8 the inner circumference 78 of vertically holing from the director element 36 facing to outflow side working interface B of seat piston 6 always.

Illustrate that as top in order to improve the stability of a piston 6, director element 36 is apart from one another by far away as much as possible.Preferably, a director element 36 is provided with near lateral bore 56 and the close vertically boring of another director element---in position of rest---8 exit regions towards spring chamber 14.

Disclosed is a kind of direct control relief valve, have in vertical boring of valve pocket the seat piston, described piston in its guiding area by two circles apart from one another by director element radially be guided in vertical boring.

Reference numeral

2 overflow valves

4 valve pockets

6 pistons

8 longitudinal drillings

10 springs

12 valve seats

14 spring chambers

16 biased members

18 spring chamber shells

20 piston shells

22 radial bores

24 spring cups

26 first ladders

28 second ladders

30 the 3rd ladders

32 four-steps

34 seal rings

36 director elements

38 circumferential grooves

40 inner circumferential portion

42 turning circular grooves

44 reservoir

46 piston edges

48 flow sections

50 internal edges

52 annular end faces

54 axial drillings

56 lateral bores

58 control edges

60 bias voltages lid

62 end portion

64 bias voltage screws

66 lock nuts

68 conical surfaces

70 inner circumference area

72 end portion

74 annular chambers

76 outer circumferential area

78 inner circumferences

80 annular spaces

82 inclined-planes

84 excircles

Claims

1. directly control relief valve for one kind, has the biased seat piston (6) that leans against on the valve seat (12) in valve pocket, the pressure oil that is used to open and close between inflow side working interface A and outflow side working interface A, B connects, it is characterized in that, seat piston (6) in guiding area, comprise at least two apart from one another by, the circular director element (36) that is provided with on the present piston circumference side, a seat piston (6) radially is supported in the valve pocket (4) by this director element.

2. direct control relief valve as claimed in claim 1, wherein director element (36) is the O V-shaped ring.

3. direct control relief valve as claimed in claim 1 or 2, wherein director element (36) has the shear strength A in 90 scopes.

4. as claim 1,2 or 3 described direct control relief valves, wherein at the turning circular groove that forms between the director element (36) on the present piston (6).

5. direct control relief valve as claimed in claim 1, wherein be used for forming in the present piston (6) in the boring (54,56) that spring chamber (14) is exerted pressure, wherein at least one lateral bore (56) is opened to outflow side working interface B under the closed condition of valve, and it can be according to the Stroke Control of opening of seat piston (6) to the opening cross-section of working interface B.

6. each described direct control relief valve in the claim as described above, wherein vertically boring (8) is radially being widened by inclined-plane (82) in the exit region of spring chamber (14).

7. each described direct control relief valve in the claim as described above, wherein director element (36) is apart from one another by very big, and wherein first director element is provided with near lateral bore (56) and second director element close vertically exit region towards spring chamber (14) of boring (8) in position of rest.

8. each described direct control relief valve in the claim as described above wherein forms reservoir (44) in the outflow side, and it has annular end face (52) to constitute the stroke auxiliary device.

9. direct control relief valve as claimed in claim 8, wherein reservoir (44) forms by the ladder that radially returns of seat piston (6), and wherein reservoir (44) axially limits by the annular end face (52) of valve seat (12) and seat piston (6).

10. directly control relief valve as claimed in claim 8 or 9, wherein have such axial distance between valve seat (12) and outflow side working interface B, feasible appearance is along the axial flow of the pressure oil of the discharge of seat piston (6).