CN103228916B - The dump valve of valve, particularly hydraulic piston pump - Google Patents

Abstract

The present invention relates to a kind of valve (10), the dump valve (10) of hydraulic piston pump especially for conveyance fluid, described valve has: valve seat (12), forms the valve opening (14) with inwall (42) in this valve seat；Valve closure body (18), this valve closure body is arranged on described valve seat (12) and is used for selectively opening and closing described valve opening (14)；And guiding piece (20), this guiding piece guides described valve closure body (18) relative to described valve seat (12), wherein, during described guiding piece (20) extends to described valve opening (14) and described guiding piece (20) have at least one guide recess (40) of fluid and at least one abut on the inwall (42) of described valve opening (14) region (44) with the described valve closure body (18) of guiding.

Description

The dump valve of valve, particularly hydraulic piston pump

Technical field

The present invention relates to a kind of valve, the discharge of hydraulic piston pump especially for conveyance fluid Valve, it has: valve seat, forms the valve opening with inwall in this valve seat；Valve closure body, This valve closure body is arranged on valve seat for selectively opening and closing described valve opening；And Guiding piece, this guiding piece guides valve closure body relative to valve seat.Moreover, it relates to A kind of hydraulic piston pump and a kind of motor vehicle braking system.

Background technology

The hydraulic piston pump of such as motor vehicle braking system is generally of ball valve as entering valve and row Go out valve, because it can manufacture less expensive.

The valve of this ball valve form is usually placed in valve casing, and this valve casing is fixedly clamped in can On the bearing of the piston moved into and out in cylinder.Enter valve and be configured so that fluid can The entrance device that reciprocates through by means of piston is inhaled into the pressure span of cylinder interior In.Afterwards, under stress fluid is transported to for doing from pressure span by dump valve In the hydraulic system of merit.

Valve casing is designed to shell the most cup-shapedly, and spiral return spring is on its interior, This return spring is pressed against on spherical closure body.This spherical closure body thus abuts in structure Make on the valve seat at piston side.

If piston is forced out from cylinder by means of return spring, then negative owing to being formed in cylinder Pressure, the closure body entering valve overcomes the power of return spring to be lifted at valve seat.At piston During this motion, entrance valve is opened and fluid is inhaled into pressure span by entering device In.

If piston is pressed in cylinder by means of eccentric, then enters valve and close and dump valve Overcome spring force to be lifted by closure body in this place and be opened.Fluid is from pressure span quilt It is transported in the hydraulic system of acting.

DE 10 2,008 043 841 A1 disclose a kind of with valve ball and the ball valve of valve seat, Especially for the high pressure valve of the high-pressure pump of fuel injection apparatus, wherein, for interrupting defeated The valve ball entering the connection between portion and output unit acts as a seal receptacle jointly with valve seat. Here, valve ball is pressed against on valve seat by means of spiral return spring.

Additionally, DE 10 2,004 028 889 A1 discloses a kind of for delivering hydraulic fluid Piston pump, its have cylinder element, can in this cylinder element reciprocating piston and piston chamber, In this piston chamber, by means of piston, hydraulic fluid can be applied pressure.This piston pump also wraps Include dump valve and the entrance valve being controlled in the way of gap.In dump valve, by means of Valve ball as closure body is pressed against on corresponding valve seat by the return spring of dish type.

Summary of the invention

According to the present invention, a kind of valve, hydraulic piston pump especially for conveyance fluid are proposed Dump valve, described valve has: valve seat, forms the valve opening with inwall in this valve seat；Valve Closure body, this valve closure body is arranged on valve seat for selectively opening and closing valve opening； And guiding piece, this guiding piece guides valve closure body relative to valve seat, and wherein, guiding piece prolongs Reach in valve opening and guiding piece have at least one guide recess of fluid and at least one Abut on valve opening inwall to guide the region of valve closure body.

Described hydraulic piston pump preferably includes the piston of cylinder, and it is may move into and can move The mode gone out is bearing in the inner space of cylinder.The inner space of cylinder is arranged and is sealed with With the pressure span of fluid filled.When piston removes from cylinder, formed in pressure span Negative pressure and piston draw fluid in pressure span by entering valve.When moving into, live Fill in and by dump valve, fluid is expressed to from pressure span in the hydraulic system of acting.

Here, fluid is interpreted as gas and/or liquid, such as mineral oil base or ethylene glycol Hydraulic fluid.

Advantageously, enter valve and/or dump valve is designed to the valve according to the present invention.According to this The valve of invention has the valve seat with valve opening, valve closure body and guides valve to cut out relative to valve seat The guiding piece of body.Valve seat includes front side and rear side, and wherein, the rear side of valve seat is interpreted as stream Body is flowed into the side in valve opening, and front side be interpreted as that fluid flows out from valve opening one Side.Valve closure body is arranged on the front side of valve seat, and with the guiding piece stretched in valve opening with The mode of transmission power is connected with each other.

During piston removes from cylinder, fluid is inhaled by entering valve due to the negative pressure produced Enter in pressure span.Here, valve closure body is lifted a certain distance at valve seat, and Fluid is by valve opening feed pressure region.This dump valve is base during piston removes from cylinder This upper fluid is closed hermetically.

Enter valve to close when piston is moved in cylinder.Due to the pressure produced in pressure span Power, the valve closure body of dump valve is lifted and valve opening is opened.Afterwards, fluid is from pressure area Territory flows in the hydraulic system of acting along dump valve.

According to the present invention, this valve includes guiding piece, this guiding piece be arranged in valve opening and with Valve closure body is connected.Valve closure body is positioned on valve seat by this guiding piece, say, that draw Guiding element guides valve closure body during the opening and closing of valve in the distance limited.Close at valve Closing period, valve closure body is directed on the predetermined position on valve seat by guiding piece especially, In this position, valve closure body is formed substantially fluid tight together with valve seat by sealing surface Closing.

To this end, guiding piece is preferably designed to the convex shoulder or section constructed elongatedly, its Be arranged in valve closure body in the face of valve opening side on.This elongated convex shoulder is accommodated in valve In the inside in hole.

Guiding piece has at least one and abuts on valve opening inwall to guide valve closure body Region.At least one other region (guiding the recess of fluid) is in this and valve opening Wall is spaced apart and realizes, and fluid can be at the inwall of valve opening and drawing when valve closure body is lifted Valve opening is flowed through between the outer wall of guiding element.That is, guiding piece is divided at least two region, tool It is divided into for body on an inwall abutting in valve opening and is achieved in axially and radially going up The region accurately guided to valve closure body, and an on the other hand recessed region, its (in the case of dump valve) provides at discharge chambe (that is pressure span) and high pressure The connection guiding fluid between side (that is hydraulic system).

An advantage of the invention that, on the one hand guarantee good stream according to the valve of the present invention The closing that body seals, the easiest and good closedown performance, even and if at pressure Respond the most quickly and accurately time the least.On the other hand, guiding piece or be connected with this guiding piece The valve closure body connect can manufacture inexpensively.Owing to having non-according to the valve of the present invention The simplest structure, it is possible to decrease production cost.

Additionally, need comparatively small installing space, because eliminating according to the valve of the present invention The spiral return spring being usually placed on the front side of valve seat and spherical valve are closed Body.Achieve the joint space-efficient of particularly dump valve and compact structure or version, Wherein, during opening and closing reliably and accurately guide valve closure body.Due to root The guiding to valve closure body according to the present invention, it is therefore prevented that the less desirable of valve closure body deflects away from, Thus achieve the improvement of the so-called noiseproof feature of hydraulic piston pump.

According to a kind of favourable improvement project of the valve according to the present invention, it is used for guiding valve closure body Region be configured at least one lath, this lath abuts on the inwall of valve opening vertically.

This improvement project provides the particularly compact and durable of the valve according to the present invention Version.This at least one lath flank in other words is along the longitudinal extension and preferably of valve Be formed as a part for elongated convex shoulder, this part be accommodated in the inside of valve opening and Relatively closely abut on the inwall of valve opening.That is, valve closure body by means of this at least one Lath is axially and radially relative to valve seat or directed relative to valve opening.In open mode In, define the position of valve closure body exactly.

Being advantageously improved scheme according to another, guiding piece has two to five, preferably three Individual lath, it is essentially homogeneously spaced apart from each other.

These laths are alternately arranged with the recess guiding fluid.These laths are relative to drawing Guiding element radially stretches out and limits out recessed, to guide fluid region the most in the axial direction. Owing to using multiple laths extended in the axial direction, it is ensured that the most accurate to valve closure body Guiding.

According to the another scheme that is advantageously improved, guiding piece is designed to triangle on cross section.

According to this improvement project, guiding piece is designed to elongated convex shoulder and has three The lath extended in the axial direction.At top view or in cross-section, guiding piece is configured to tool The triangle of the seamed edge that have rounding and valve opening inwall matches.Hereby it is achieved that can Guiding piece that is particularly compact and that manufacture simply.

If opening period valve closure body at valve to be lifted at valve seat, then abut in valve opening This valve closure body is guided by the lath on inwall so that valve closure body is especially radially On essentially without slip, and valve closure body occupies it again during the closing process of valve Position originally, say, that form substantially fluid tight sealing surface together with valve seat.

In a kind of favourable improvement project of the valve according to the present invention, valve includes return part, its Valve closure body is applied returning place force, and this returning place force makes valve closure body be pressed against on valve seat.

This return part being preferably return spring form may be designed to the spring steel designed elongatedly Silk or flexural spring (such as ring spring or spring washer), leaf spring or the spiral of plane winding Spring.Preferably, leaf spring is made up of the metal wire of flat metal tape or Curved ground pretension. Preferably, helical spring is by the metal tape being wound around a plane, spiral shape or metal wire system Become.Helical spring or ring spring can particularly simple be assemblied in valve.Preferably, return Spring is by spring steel, be such as made up of copper beryllium alloy.

If suction or the pressure of the returning place force more than return part occurring at valve closure body, then Return part when valve closure body lifts at valve seat corresponding to valve closure body process displacement become Shape.That is, valve closure body is applied in returning place force so that valve closure body is the most again Close.

In another embodiment, return part is arranged on the outflow side of valve seat.

The outflow side of the valve according to the present invention is also defined as the front side of valve, exactly valve seat Front side.

Valve closure body is pressed against valve seat with the tensile force limited from the front side of valve seat by this return part On so that under the closed mode of valve, valve opening is closed substantially fluid tightly.Return Part applies pressure to valve closure body.The valve of optimization is achieved when using the spring of the above-mentioned type, It needs only to the least installing space.

If the valve according to the present invention is the form of dump valve, then return spring preferably supports At the convex shoulder of valve gap and position is fixedly fastened on the end away from valve opening of valve closure body On face.

Another according to the valve according to the present invention is advantageously improved scheme, and valve closure body is designed Become plate shape.

Such valve provides the valve closure body of plate shape, the valve closure body of this plate shape and ball The valve closure body of shape is compared has comparatively small height or size.Due to this valve closure body Less height, entrance valve and/or the dump valve with the least dead center volume can be realized, Which thereby enhance the efficiency of hydraulic piston pump.

Valve closure body can also be optionally designed to spherical crown and (that is be designed to certain ball Body section or certain part sphere), be designed to hemisphere or cone can also be designed to.

Additionally, valve closure body may be included in the support on the outflow side of valve, return part is at this It is bearing on support on valve closure body.

This support is preferably designed to such so-called supporting form, i.e. it is such as Can have nodular structure or the loop configuration of convex shoulder shape of annular, this structure supports return Part or prevent return part from sliding.

Another according to the valve according to the present invention is advantageously improved scheme, valve closure body and guiding Part is preferably designed to moulding by single-piece.

Such improvement project provides so-called valve closure body-guiding piece-unit, its structure Cause by the moulding of plastics forming.The plastic unit of this injection can be special due to its shape Being assembled in advance on valve seat and in the piston pump of hydraulic pressure, thus it is in the fabrication process goodly Can combine with other parts simply.Additionally, this valve can be durable and with low cost Ground manufactures.But, guiding piece and particularly valve closure body-guiding piece-unit also can be by metal system Become.

Additionally, valve closure body is away from preferably including locking piece on the side of guiding piece.

This locking piece realizes valve closure body locking in another component, such as spring.Thus, Particularly can realize the pre-assembled of so-called valve technically.That is, this valve is first as prepackage The parts joined are made into and and then together with pumping cylinder densification.

Additionally, live by means of the hydraulic pressure of the valve with the with good grounds present invention according to the purpose of the present invention Plug pump realizes.

Hydraulic piston pump according to the present invention includes cylinder and props up in the way of extensible may move into Hold the piston in cylinder.The pressure span with fluid filled is formed in the inner space of cylinder. When piston removes from cylinder, pressure span forms negative pressure and piston by entering valve Draw fluid in this pressure span.On the contrary, when moving into, piston will by dump valve Fluid is expressed to from pressure span in the hydraulic system of acting.

Advantageously, this entrance valve and/or dump valve are designed to feature and excellent in accordance with the above The valve according to the present invention of point.On the one hand this valve guarantees high durable property and good Sealing characteristics.On the other hand, such valve can manufacture inexpensively and can be simple Be integrated in the piston pump of hydraulic pressure.

Particularly, the least installing space is needed only to according to the guiding piece of the present invention；Also may be used Save the relatively large spiral type return bullet according to prior art on the front side being arranged in valve seat Spring.Achieving and have the compact and valve of joint space-efficient version, it achieves and closes valve The good guiding of closure.Owing to the guiding of valve closure body is prevented this valve closure body not The desired improvement deflecting away from and thus achieving noiseproof feature.

Finally, it is provided that a kind of vehicle braking system with the hydraulic piston pump according to the present invention System.

Vehicle according to the invention brakes includes hydraulic piston pump, and this hydraulic piston pump has With good grounds features described above and the valve according to the present invention of advantage.

Such motor vehicle braking system can be such as anti-lock braking system (ABS), traction control System processed (TCS-traction control system), ESP (ESP) or Can also is that electric-liquid type brakes (EHB).The most particularly advantageously, Hydraulic piston pump has valve that is durable and that simultaneously can manufacture inexpensively, and this valve guarantees High sealing and also provide for the function of optimization of brakes under long distance travelled. The best noiseproof feature turns out to be favourable.

Accompanying drawing explanation

The embodiment of the solution according to the present invention is explained in detail below according to accompanying drawing.Wherein:

Fig. 1 shows the longitudinal sectional view of the embodiment of the valve according to the present invention,

Fig. 2 shows regarding of the first embodiment of the valve closure body-guiding piece-unit according to Fig. 1 Figure II,

Fig. 3 shows the view III according to Fig. 2 being arranged in valve seat,

Fig. 4 shows the view of the second embodiment of valve closure body-guiding piece-unit,

Fig. 5 shows the another of the second embodiment of the valve closure body-guiding piece-unit according to Fig. 4 One view,

Fig. 6 shows the view of the 3rd embodiment of valve closure body-guiding piece-unit,

Fig. 7 shows the view of the 4th embodiment of valve closure body-guiding piece-unit, and

Fig. 8 shows the closure body of the valve according to Fig. 7-guiding piece-unit of being arranged in valve seat Longitudinal sectional view.

Detailed description of the invention

Fig. 1 shows the dump valve 10 of the hydraulic piston pump of motor vehicle braking system.This valve 10 wraps Including valve seat 12, circular valve opening 14 constructs in this valve seat 12.Additionally, this valve 10 also wraps Including valve closure body-guiding piece-unit 16 (seeing Fig. 2 equally), it is by the valve closure body of plate shape 18 and guiding piece 20 be integrally shaped to plastic injection piece..

Valve seat 12 has a front side 24 and rear side 26, wherein, front side 24 be defined as fluid ( This is brake fluid) flow into the side in valve opening 14, and rear side 26 be defined as fluid from The side flowed out in valve opening 14.

The piston pump of this hydraulic pressure includes may move in cylinder and can by means of eccentric is powered The piston of removal.If this piston removes from cylinder, then in the pressure span 27 of cylinder interior, That is in discharge chambe 27, produce negative pressure.Thus, enter valve to open and fluid inflow In this pressure span 27.When piston moves in cylinder, fluid is executed in pressure span 27 Plus-pressure and being extruded by the valve closure body-guiding piece-unit 16 towards dump valve 10.

In order to selectively open and close valve opening 14, valve closure body 18 is arranged in valve seat 12 Front side 24 on, on the outflow side 24 of that is valve 10.Valve closure body 18 wherein Abutting in the region on valve seat 12 when valve 10 cuts out and form sealing surface 29, this is close Front cover guarantees substantially fluid tight closing.

Valve closure body 18 is subjected to back by means of return part 30 (at this for helical spring 30) Virial, this returning place force makes valve closure body 18 press against on the front side 24 of valve seat 12.Spring 30 It is arranged on the outflow side 24 of valve 10 and thus to valve closure body 18 and applies pressure.Here, Spring 30 is bearing on the end face 32 away from valve opening 14 of valve closure body 18 and is supported on On the convex shoulder 34 of valve gap 36.

If the pressure being applied on valve closure body 18 is more than the returning place force of spring 30, then Valve closure body 18 is lifted at valve seat 12 and fluid is directed into the hydraulic pressure for acting In system (on so-called high-pressure side 37).That is, dump valve 10 is by discharge chambe 27 and height Pressure side 37 is separately.

During opening and closing valve 10, guiding piece 20 guides valve to close relative to valve seat 12 Body 18.

To this end, guiding piece 20 is configured to the convex shoulder 20 of cylinder, it is attached at valve closure body 18 in the face of valve opening 14 end face 38 at and extend in valve opening 14.Guiding piece 20 quilt It is contained in valve opening 14 so that this guiding piece is with three recess 40 guiding fluid and valve The inwall 42 in hole 14 is spaced apart.On the contrary, be alternately arranged with the recess 40 guiding fluid Region 44 abut on the inwall 42 of valve opening 14 (see Fig. 2 and Fig. 3).These regions 44 are arranged for, and guide valve closure body 18 during opening and closing on axially and radially And it is positioned accurately on valve seat 12.Valve closure body 18 is quilt in the distance limited Guide.Owing to such guiding of valve closure body 18 prevents valve closure body 18 not Desired deflect away from, thus achieve the improvement of the so-called noiseproof feature of hydraulic piston pump.

If valve closure body 18 is lifted at valve seat 12, then fluid is along guiding fluid Recess 40 flow through valve 10.

Show valve closure body-guiding piece-unit 16 the most in the way to enlarge. Guiding piece 20 is configured to triangle on cross section.Abut on the inwall 42 of valve opening 14 For guiding the region 44 of valve closure body to be configured to three the most to each other at this The lath 46 extended in the axial direction separated.Therefore, during the opening and closing of valve, this A little laths 46 slip over the inwall 42 of valve opening on the longitudinal length of valve opening 14.Drawing of triangle The lath 46 of guiding element unit 20 utilizes inwall 42 phase of outer seamed edge 48 and valve opening 14 at this Join, say, that along the direction arching of wall 42.

Other reality of valve closure body-guiding piece-unit 16 is shown in Fig. 4, Fig. 5 and Fig. 6 Execute example.The unit 16 being shown in which is included in the support 50 on the outflow side 24 of valve 10, Return part 30 is bearing at valve closure body 18 on this support.According to Fig. 4's and Fig. 5 Valve closure body-guiding piece-unit 16 has convex shoulder shape or step-like loop configuration.Phase Instead, figure 6 illustrates such support 50, i.e. in this support, as The nodular structure of annular, 8 tuberositys divide in a circle in the way of being evenly spaced apart altogether It is arranged on end face 32 cloth.Support 50 prevents return part 30, such as cylinder Helical spring slip on the end face 32 of valve closure body 18.

The guiding piece 20 distribution bag of the valve closure body-guiding piece-unit 16 according to Fig. 4 to Fig. 6 Include four laths 46, described four laths and four recess 40 alternately cloth guiding fluid Put.

Valve closure body-guiding piece-the unit 16 illustrated in figures 7 and 8 includes valve closure body 18, this valve closure body is disposed with on the side away from guiding piece 20 locking piece 52.Should Locking piece 52 has the convex shoulder 54 of cylinder, and it attenuates on the section 55 limited.? The end relative with valve closure body 18, is formed with locking on cylindrical convex shoulder 54 Mechanism 56, it is arranged for, in locking to spring or in another component.Thus, especially It it is the assembled in advance achieving valve 10.Here, valve 10 as self-existent parts by advance Assemble and subsequently together with pumping cylinder densification.

Hereby it is achieved that with low cost and durable valve 10, its light, quickly and Guarantee good sealing function and liquid can be simply integrated into while accurate closedown performance In pressure piston pump.Additionally, valve closure body-guiding piece-unit 16 has compact structure form, Thus ensure that the joint space-efficient structure of dump valve 10.

Here, be shown as flap type according to the valve 10 of the present invention, because this valve 10 guarantees There is in piston pump the least dead center volume.However it is also contemplated that other valve geometry knot Structure, such as spherical crown valve, semisphere valve or cone valve.Additionally, valve closure body-guiding piece-unit 16 also can be made of metal.

Finally, it should be noted that in application documents and the most in the dependent claims Although all features mentioned quote one or more established right requirement in form, also should Can individually or in any combination obtain independent protection.

Claims (13)

1. a valve (10), described valve has: valve seat (12), is formed in this valve seat There is the valve opening (14) of inwall (42)；Valve closure body (18), this valve closure body is arranged Described valve seat (12) is used for selectively open and close described valve opening (14)；With And guiding piece (20), this guiding piece guides described valve to close relative to described valve seat (12) Body (18), wherein, described guiding piece (20) extend in described valve opening (14) and Described guiding piece (20) has at least one recess (40) and at least one guiding fluid To guide described valve closure body (18) on the individual inwall (42) abutting in described valve opening (14) Region (44), it is characterised in that described valve closure body (18) is away from described guiding Locking piece (52) is included on the side of part (20).

2. according to the valve (10) described in claim 1, it is characterised in that be used for guiding institute The region (44) stating valve closure body (18) is configured at a lath (46), described At least one lath abuts on the inwall (42) of described valve opening (14) vertically.

3. according to the valve (10) described in claim 2, it is characterised in that described guiding piece (20) having at least two lath (46), described lath is essentially homogeneously spaced Open.

4. according to the valve (10) described in claim 3, it is characterised in that described guiding piece (20) there are three laths (46).

5. according to the valve (10) described in claim 1 or 2, it is characterised in that described in draw Guiding element (20) is designed to triangle on cross section.

6. according to the valve (10) described in claim 1 or 2, it is characterised in that described valve (10) including return part (30), described valve closure body (18) is applied back by this return part Virial, described returning place force makes described valve closure body (18) be pressed against on described valve seat (12).

7. according to the valve (10) described in claim 6, it is characterised in that described return part (30) it is arranged on the outflow side (24) of described valve (10).

8. according to the valve (10) described in claim 1, it is characterised in that described valve cuts out Body (18) is designed to plate shape.

9. according to the valve (10) described in claim 7, it is characterised in that described valve cuts out Body (18) is included in the supporting arrangement (50) on the outflow side (24) of described valve (10), Described return part (30) is bearing in described valve closure body (18) on described supporting arrangement (50) Place.

10. according to the valve (10) described in claim 1 or 2, it is characterised in that described valve Closure body (18) and described guiding piece (20) are designed to moulding integratedly.

11. according to the valve (10) described in claim 1, it is characterised in that described valve (10) It it is the dump valve of the hydraulic piston pump for conveyance fluid.

12. according to the valve (10) according to any one of claim 1 to 11 at hydraulic piston Application in pump.

13. according to the application in hydraulic piston pump of the valve (10) described in claim 12, It is characterized in that, described hydraulic piston pump is the hydraulic piston pump of motor vehicle braking system.