CN104401312B

CN104401312B - Jiefang 141 main brake valve provided with filter screen

Info

Publication number: CN104401312B
Application number: CN201410627111.5A
Authority: CN
Inventors: 田青锋
Original assignee: CHANGTONG TECHNOLOGY Co Ltd
Current assignee: CHANGTONG TECHNOLOGY Co Ltd
Priority date: 2014-11-10
Filing date: 2014-11-10
Publication date: 2017-01-25
Anticipated expiration: 2034-11-10
Also published as: CN104401312A

Abstract

The invention discloses a Jiefang 141 main brake valve provided with a filter screen. The filter screen is arranged inside the main brake valve. The filter screen is simple in structure, is convenient to install, and can be arranged outside a valve core of the brake valve. The filter screen is directly arranged around the valve core, and solid particles carried in gas can be prevented from entering the valve core, so that the working reliability of the valve core is enhanced greatly, and braking accidents are avoided.

Description

Liberation 141 main brake valves with drainage screen

Technical field

The invention mainly relates to the technical field of the parts of brake valve of car, specifically a kind of liberation 141 band drainage screen Main brake valve.

Background technology

It is generally provided with filter at present in the pipeline of brakes, for filtering the solid with gas flowing in trachea Granule foreign, thus ensureing that each brake component is not affected the reliability it is ensured that its work by solid particle polluter, but by In filter apart from the distant of the valve element of each valve it is impossible to avoid the gas after filtration again by other before entering valve element The new solid particle pollution producing, sometimes still occurs that solid particle enters valve element, the sealing of impact valve element, causes gas leakage Accident, need to be proposed new solution.

The brake system of truck of the prior art and heavy goods vehicles is too anxious, the bad control of feel, easily causes brake Piece rapidly heats up, and causes carbonization, directly influences braking effect, and braking is too urgent, also can cause sliding inclined, affect stability in the large, Thus producing insecurity, or unnecessary economic loss.In order to solve the problems, such as truck these brakes when, our units are successively The two-stage cadence braking master valve proposing and the patent of three-level dummy piston assembly, can export " two grades or three-level point stop "." point Stop " principle can make compressed air, and form pulse in control pipeline and air chamber, be applied to brake block, and every subpulse all phases When in instrument wipe a brake block.It is not only able to accomplish that brake hubs are effectively combined with brake block, and largely also Improving brake block carbonization or form adamantine layer, thus avoiding the phenomenon of poor stop to occur, reaching good braking effect.On The critical component stated in two patents is spring bag card, and because spring bag card shape matching is special, processing technique is complicated, yield rate Not high, additionally there are the complicated problem of mounting process, the quality of whole main brake valve is had a great impact.

Content of the invention

In order to solve the above problems, the present invention proposes a kind of liberation 141 main brake valves with drainage screen.

The technical scheme is that a kind of liberation 141 main brake valves with drainage screen, including being bolted one Rise upper valve body, lower valve body,

Described upper valve body upper end is provided with torque arm seat, Middle face is provided with opening on torque arm seat, is provided with this opening The cylindrical slide sleeve of upper end closed, sliding sleeve can move up and down in opening；It is hinged in the middle part of torque arm on the support otic placode on torque arm seat, Torque arm upper end is provided with the upper end that rotatable pinch roller is pressed in sliding sleeve, torque arm lower end be provided with withstand on torque arm seat side adjusting screw and Locking nut；

The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step,

It is provided with secondary points in this dummy piston within the chamber to stop dummy piston assembly, including dummy piston body, spring bag card, top Pole socket, the top of dummy piston body is columnar width disk chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is bar Fluid chamber；The top of described tip-lever support is width disk, and bottom is attenuate successively the three sections of step bodies of rod stretching out from width disk, from upper Down it is followed successively by first body of rod, second body of rod, the 3rd body of rod, the hypomere of the 3rd body of rod inserts the body of rod chamber of dummy piston body bottom Interior, width disk is arranged on the width disk within the chamber in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, position Between the step body of rod and the inwall of dummy piston body width disk chamber of tip-lever support, the upper end of spring bag card is provided with inside annular Upper overturning, lower end is provided with flange under outside annular；Equipped with one-level balancing spring, one-level balancing spring props up spring bag card outer cover Support is under the lower surface of tip-lever support width disk and spring bag snap ring shape between flange upper surface；Spring bag card inwall and the step body of rod it Between be provided with two grades of balancing springs, the lower end of two grades of balancing springs is supported on the lower surface of dummy piston body width disk chamber, two grades The external diameter of the upper end of balancing spring is more than upper overturning internal diameter, and upper overturning internal diameter is more than or equal to the diameter of first body of rod, two grades of balances The internal diameter of the upper end of spring is less than the diameter of first body of rod；Two grades of balancing spring upper ends are to the step surface of the first body of rod lower end Distance is l1, and the distance of the step surface of the second body of rod lower end to body of rod chamber upper surface is l2, the upper end of described spring bag card The distance between face and width disk lower surface are l4, l1 ＜ l2 ＜ l4；The inside of tip-lever support is provided with push rod chamber, in push rod chamber and sliding sleeve Upper surface between be provided with push rod；

The top of described dummy piston body is provided with the edge turning up, the step in the lower surface at this edge and upper valve body It is provided with back-moving spring first between the step of shape dummy piston chamber；The outer surface of dummy piston body is put down with the step in upper valve body The lower inner surface of weighing apparatus piston chamber is the face that is slidably matched, and the bottom of the described outer surface of dummy piston body is provided with cannelure, It is provided with sealing ring in this cannelure；

The middle part of described upper valve body is upper valve assembly chambeies body, in the outside of upper valve assembly chambeies body and upper valve body housing Between be provided with upper interlayer, the top of upper interlayer and dummy piston chamber insertion, upper valve assembly chambeies side portion is provided with and protrudes horizontally up The enterprising QI KOU of upper valve body housing, the sidepiece of upper valve body is additionally provided with the upper gas outlet protruding horizontally up and communicating with upper interlayer；Upper The top of valve member cavity is provided with the upper valve aperture of door that inside flange is formed, under this upper valve aperture of door and described dummy piston body The external end head position of the body of rod chamber that portion stretches out corresponds to, and this upper valve aperture of door is straight with diameter greater than the external end head of body of rod chamber Footpath, in upper valve assembly chambeies body, portion is provided with valve member；

Upper valve member includes the upper valve of tubular and the upper valve seat of annular, and upper valve seat is sleeved on upper valve outdoors, on It is the face that is slidably matched between the outer wall of the inwall of valve seat and upper valve, and be provided with sealing structure；Upper valve seat is pacified by jump ring It is contained in the lower end of valve component chambers；It is to be slidably matched between the inwall of the outer wall of upper valve seat and upper valve assembly chambeies body Face, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively in upper valve inside and outside this annular disk body Door end forms in-flanges and flanging, is provided with valve bullet between this flanging lower surface and upper surface of upper valve seat Spring；The upper surface of the annular disk body of upper valve upper end is provided with sealing gasket for valve, is provided with two rings in the upper surface of this sealing gasket Shape is raised, and the edge in the annular protrusion in outside and valve hole cooperatively forms valve on-off structure, the annular protrusion of inner side with flat The outer face of the body of rod chamber of weighing apparatus piston lower portion forms valve venting on-off structure；In upper valve spring outside and upper valve group It is provided with upper valve core drainage screen, this valve element drainage screen includes the annular end-rack on top and the annular of bottom between part cavity inner wall End-rack, is connected to the support column between upper and lower annular end-rack, inside support column or outside is provided with columnar filter screen, should The upper end of filter screen is connected with the circular end-rack on top, and the lower end of this filter screen is connected with the annular end-rack of bottom, described valve element The cross section that the annular end-rack on drainage screen top is connected with ringwise is the upper sealing strip edge of wedge shape, and on this, sealing strip edge is upper End face high outside and low outside in the conical surface, upper sealing strip along and the annular end-rack on top between for flexible connection；The circle of described bottom The cross section that annular end-rack is connected with ringwise is the lower sealing strip edge of wedge shape, and the lower surface on this lower sealing strip edge is outer low and inner high to be in The conical surface, for flexible connection between lower sealing strip edge and the annular end-rack of bottom；The upper surface on upper sealing strip edge and upper valve aperture of door Lower surface contact, the lower surface on lower sealing strip edge and the upper surface of upper valve seat；

Upper valve body bottom is relay piston chamber, and relay piston chamber interior is provided with relay piston, during relay piston includes The vertical hollow rod body of the heart and the piston body being connected to around the body of rod, in piston body outer cover equipped with piston bush, piston bush interior It is the face that is slidably matched between wall and the outer wall of piston body, piston bush is the face that is slidably matched with the inwall of relay piston chamber；Servo The upper end of the hollow rod body of piston passes corresponding with the body of rod chamber lower end of dummy piston from the middle part of upper valve；Under piston body Surface is provided with spring between lower valve body upper end；

The top of lower valve body is lower valve assembly cavity, sets between the outside of lower valve assembly cavity and lower valve body housing There are lower interlayer, the top of lower interlayer and lower piston chamber insertion, lower valve assembly cavity side portion is provided with and protrudes horizontally up lower valve body Lower air inlet, the sidepiece of lower valve body is additionally provided with the lower gas outlet protruding horizontally up and communicating with lower interlayer；In lower valve assembly chambeies The top of body is provided with the lower valve aperture of door that inside flange is formed, the hollow rod body lower end of this lower valve aperture of door and described relay piston Position corresponds to, and this lower valve bore dia is more than the diameter of the hollow rod body lower end of relay piston, in lower valve assembly chambeies Internal portion is provided with lower valve assembly；

Lower valve assembly includes the lower valve of tubular and the lower valve gate seat of annular, and lower valve cover for seat is contained in lower valve outdoors, under It is the face that is slidably matched between the inwall of valve seat and the outer wall of lower valve, and be provided with sealing structure；The outer wall of lower valve gate seat with It is the face that is slidably matched between the inwall of valve member cavity, and be provided with sealing structure；The upper end of described lower valve is annular disk body, Form in-flanges and flanging in lower valve end inside and outside this annular disk body respectively, this flanging lower surface with It is provided with lower valve spring between the upper surface of valve seat；The upper surface of the annular disk body of lower valve upper end is provided with lower valve door sealing Pad, is provided with two annular protrusions in the upper surface of this sealing gasket, the annular protrusion in outside is cooperatively formed with the edge of lower valve aperture of door Lower valve on-off structure, the annular protrusion of inner side forms lower valve venting keying knot with the hollow rod body lower end of relay piston Structure；It is provided with bottom spool drainage screen between lower valve spring outside and lower valve assembly cavity inner wall, this valve element drainage screen includes The annular end-rack on top and the annular end-rack of bottom, are connected to the support column between upper and lower annular end-rack, in support column Inner side or outside be provided with columnar filter screen, the upper end of this filter screen is connected with the circular end-rack on top, the lower end of this filter screen and The annular end-rack of bottom connects, and the cross section that the annular end-rack on described valve element drainage screen top is connected with ringwise is wedge The upper sealing strip edge of shape, on this upper surface on sealing strip edge high outside and low outside in the conical surface, upper sealing strip is along the annular end with top It is flexible connection between frame；The cross section that the annular end-rack of described bottom is connected with ringwise is the lower sealing strip of wedge shape Edge, the lower surface on this lower sealing strip edge outer low and inner high in the conical surface, lower sealing strip is along being flexible and the annular end-rack of bottom between Connect；The upper surface on upper sealing strip edge is contacted with the lower surface of lower valve aperture of door, the lower surface on lower sealing strip edge and lower valve gate seat Upper surface；

It is provided with exhaust nozzle chamber in lower valve body bottom, and exhaust nozzle is installed with by jump ring, this exhaust nozzle includes outer Cylinder and inner core, the outer tube of exhaust nozzle is supported on the lower end of lower valve cover for seat, and inner core is sleeved on inside lower valve, the outer wall of inner core with It is the face that is slidably matched between the inwall of lower valve.

The described external diameter of two grades of balancing springs is mated with the internal diameter of spring bag card, the internal diameter of described two grades of balancing springs Diameter matches with second body of rod；The described internal diameter of one-level balancing spring is mated with the external diameter of spring bag card；Described width disk Lower surface is provided with annular groove outside first body of rod；This annular groove width is mated with the width of the upper end of spring bag card.

The described annular end-rack on valve element drainage screen top, the annular end-rack of bottom, support column, upper sealing strip along, Lower sealing strip is stainless steel along the plastic material being integrated injection molding, described cylindrical filter net, drainage screen Upper end and the annular end-rack hot-melt adhesive paste on top, the annular end-rack hot-melt adhesive paste of the lower end of drainage screen and bottom, drainage screen Side and support column hot-melt adhesive paste；The cross section of the connecting portion between described upper airtight edge and the annular end-rack on top Width is b1, cross-sectional width b2 of the annular end-rack on top, and b1 is not more than the 1/3 of b2；Airtight edge and bottom under described Annular end-rack between connecting portion cross-sectional width be b3, cross-sectional width b4 of the annular end-rack of bottom, b3 is little In b4 1/3.

The lower end of described exhaust nozzle is provided with dust-proof cushion.

A kind of liberation 141 main brake valves with drainage screen, including the upper valve body being bolted together, lower valve body,

The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step, and dummy piston within the chamber is provided with three-level Put dummy piston assembly of stopping,

This three-level point is stopped dummy piston assembly, including dummy piston body, spring bag card, tip-lever support,

The top of dummy piston body is columnar width disk chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is Body of rod chamber；

The top of described tip-lever support is width disk, and bottom is attenuate successively the three sections of step bodies of rod stretching out from width disk, from On be down followed successively by first body of rod, second body of rod, the 3rd body of rod, the hypomere of the 3rd body of rod inserts the body of rod of dummy piston body bottom Within the chamber, width disk is arranged on the width disk within the chamber in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, Between the step body of rod and the inwall of dummy piston body width disk chamber of tip-lever support, the upper end of spring bag card is provided with inside ring Shape upper overturning, lower end is provided with flange under outside annular；Spring bag card outer cover supports equipped with balancing spring first, balancing spring first Under the lower surface and spring bag card arc of tip-lever support width disk between flange upper surface；Between spring bag card inwall and the step body of rod It is provided with balancing spring second, the lower end of balancing spring second is supported on the lower surface of dummy piston body width disk chamber, balancing spring second Upper end external diameter be less than upper overturning diameter, upper overturning internal diameter be more than or equal to first body of rod diameter, the upper end of balancing spring second Internal diameter be less than first body of rod diameter；It is provided with balancing spring third in body of rod within the chamber,

The distance of the step surface to the first body of rod lower end for the balancing spring second upper end is l1, and the step surface of the second body of rod lower end arrives The distance of body of rod chamber upper surface is l3, and the distance between upper end of balancing spring third to the 3rd body of rod lower surface is l2, described The distance between the upper surface of spring bag card and width disk lower surface be l, 4, l1 ＜ l2 ＜ l3 ＜ l4；

The described external diameter of balancing spring second is mated with the internal diameter of spring bag card, the described internal diameter of balancing spring second and The diameter matches of bipole body；The described internal diameter of balancing spring first is mated with the external diameter of spring bag card；Described balancing spring third For rubber spring；Described width disk lower surface is provided with annular groove outside first body of rod；This annular groove width and spring bag The width coupling of the upper end of card.

The lower end of described exhaust nozzle is provided with dust-proof cushion.

The solution have the advantages that:

It is provided with drainage screen, this filter screen structure is simple, easy for installation inside this liberation 141 main brake valve with drainage screen, Outside the valve element of the brake valve that can load, directly drainage screen is arranged on around valve element, it can be avoided that carry in gas consolidates Body shell body enters in valve element, thus significantly lifting the functional reliability of valve element；Brake accident is avoided to occur.

This liberation 141 main brake valve with drainage screen, its internal secondary points stops dummy piston and three-level point is stopped, and balance is lived The spring bag card of plug assembly, using upper, annular in-flanges, the structure of lower annular flanging, simplifies the knot of spring bag card Structure, reduces difficulty of processing and assembly difficulty, is capable of the qualification rate of significantly improving product.

Spring bag card can be by machining straight forming it is also possible to carry out one-time formed adding by Sheet Metal Forming Technology Work, the course of processing is simple, the also simple many of spring installation spring bag card within simultaneously.

Brief description

This liberation 141 cross-sectional view with the main brake valve of drainage screen of Fig. 1；

This liberation 141 cross-sectional view with the main brake valve of drainage screen of Fig. 2；

Fig. 3 is the main view cross-sectional view of valve element drainage screen in Fig. 1 and Fig. 2；

Fig. 4 is the c-c cross-sectional view in Fig. 3；

Fig. 5 is the partial enlargement structural representation in Fig. 3.

Fig. 6 is that this secondary points is stopped the main structure diagram of dummy piston assembly；

Fig. 7 is that this three-level point is stopped the main structure diagram of dummy piston assembly；

Fig. 8 is the main structure diagram of spring bag card；

Fig. 9 is the a-a cross-sectional view of Fig. 8；

Figure 10 is the main structure diagram of tip-lever support；

Figure 11 is the b-b cross-sectional view of Figure 10；

In figure 1. dust-proof cushion, 2. exhaust nozzle, 3. jump ring, 4.o type circle, 5. lower valve gate seat, 6. lower valve body, 7.o type circle, 8.o Type circle, 9.o type circle, 10. lower valve spring, 11.o type circle, 12. springs, 13.o type circle, 14. piston bush, 15. relay pistons, 16. upper valve bodies, 17. back-moving springs, 18. torque arm seats, 19. bolts, 20. sliding sleeves, 21. push rods, 22. dust-proof cushions, 23.o type circle, 24. lower valves, 25. bolts, 26.o type circle, 27. jump rings, 28.o type circle, 29.o type circle, valve seat on 30., valve on 31., Valve spring, 33. dummy pistons, 34. tip-lever supports, 35.o type circle, 36. one-level balancing springs or balancing spring first, 37. on 32. Spring bag card, 38. 2 grades of balancing springs or balancing spring second, 39. jump rings, 40. adjusting screw, 41. locking nut 42. bearing pin 43. plain washer, 44. split pin, 45. roller, 46. bearing pin, 47. plain washer 48. split pin, 49. torque arm, 51. balancing springs Thirdth, 52. enterprising QI KOU, gas outlet, 54. times air inlets, 55. times gas outlets, 56. upper valve core drainage screens, 57. bottom spool mistakes on 53 Filter screen

Wherein 36-1. width disk, 36-2. annular groove, 36-3. first body of rod, 36-4. second body of rod, 36-5. the 3rd bar Flange under body, 33-1. upper overturning, 33-2..

Sealing strip edge, the annular end-rack on 102. tops, 103. support columns, 104. drainage screens, 105. bottoms in figure 101. Annular end-rack, 106. times sealing strip edges；The upper surface on edge is sealed on 101-1..

Specific embodiment

Embodiment: referring to Fig. 1,3-5,6,8-11, a kind of in figure liberation 141 main brake valves with drainage screen, including passing through The upper valve body that is bolted together, lower valve body,

The middle part of described upper valve body is upper valve assembly chambeies body, in the outside of upper valve assembly chambeies body and upper valve body housing Between be provided with upper interlayer, the top of upper interlayer and dummy piston chamber insertion, upper valve assembly chambeies side portion is provided with and protrudes horizontally up The enterprising QI KOU of upper valve body housing, the sidepiece of upper valve body is additionally provided with the upper gas outlet protruding horizontally up and communicating with upper interlayer；Upper The top of valve member cavity is provided with the upper valve aperture of door that inside flange is formed, under this upper valve aperture of door and described dummy piston body The external end head position of the body of rod chamber that portion stretches out corresponds to, and this upper valve aperture of door is straight with diameter greater than the external end head of body of rod chamber Footpath, in upper valve assembly chambeies body, portion is provided with valve member；Upper valve spring is outside and upper valve assembly chambeies body in wall it Between be provided with upper valve core drainage screen, this valve element drainage screen includes the annular end-rack on top and the annular end-rack of bottom, is connected to The up and down support column between annular end-rack, inside support column or outside is provided with columnar filter screen, the upper end of this filter screen It is connected with the circular end-rack on top, the lower end of this filter screen is connected with the annular end-rack of bottom, described valve element drainage screen top Annular end-rack be connected with the upper sealing strip edge that cross section ringwise is wedge shape, high interior the upper surface on sealing strip edge on this outside Low in the conical surface, upper sealing strip along and the annular end-rack on top between for flexible connection；The annular end-rack of described bottom is even Be connected to the lower sealing strip edge that cross section ringwise is wedge shape, the lower surface on this lower sealing strip edge outer low and inner high in the conical surface, under close For flexible connection between edge sealing edge and the annular end-rack of bottom；The upper surface on upper sealing strip edge and the lower surface of upper valve aperture of door connect Touch, the lower surface on lower sealing strip edge and the upper surface of upper valve seat；

Upper valve member includes the upper valve of tubular and the upper valve seat of annular, and upper valve seat is sleeved on upper valve outdoors, on It is the face that is slidably matched between the outer wall of the inwall of valve seat and upper valve, and be provided with sealing structure；Upper valve seat is pacified by jump ring It is contained in the lower end of valve component chambers；It is to be slidably matched between the inwall of the outer wall of upper valve seat and upper valve assembly chambeies body Face, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively in upper valve inside and outside this annular disk body Door end forms in-flanges and flanging, is provided with valve bullet between this flanging lower surface and upper surface of upper valve seat Spring；The upper surface of the annular disk body of upper valve upper end is provided with sealing gasket for valve, is provided with two rings in the upper surface of this sealing gasket Shape is raised, and the edge in the annular protrusion in outside and valve hole cooperatively forms valve on-off structure, the annular protrusion of inner side with flat The outer face of the body of rod chamber of weighing apparatus piston lower portion forms valve venting on-off structure；

The described external diameter of two grades of balancing springs is mated with the internal diameter of spring bag card, the internal diameter of described two grades of balancing springs Diameter matches with second body of rod；The described internal diameter of one-level balancing spring is mated with the external diameter of spring bag card.

Described width disk lower surface is provided with annular groove outside first body of rod；This annular groove width and spring bag card The width coupling of upper end.

The described annular end-rack on valve element drainage screen top, the annular end-rack of bottom, support column, upper sealing strip along, Lower sealing strip is stainless steel along the plastic material being integrated injection molding, described cylindrical filter net, drainage screen Upper end and the annular end-rack hot-melt adhesive paste on top, the annular end-rack hot-melt adhesive paste of the lower end of drainage screen and bottom, drainage screen Side and support column hot-melt adhesive paste；The cross section of the connecting portion between described upper airtight edge and the annular end-rack on top Width is b1, cross-sectional width b2 of the annular end-rack on top, and b1 is not more than the 1/3 of b2；Airtight edge and bottom under described Annular end-rack between connecting portion cross-sectional width be b3, cross-sectional width b4 of the annular end-rack of bottom, b3 is little In the 1/3 of b4, connecting portion is narrow to be deformed under pressure beneficial to it, makes the end face on sealing strip edge preferably and other parts Laminating, more preferably, connecting portion is more narrow better, simply depicts the relation of b1 and b2 in accompanying drawing 3, due to b3 and b4 position for sealing effectiveness Put symmetrically it is not necessary that indicating again in figure.

The lower end of described exhaust nozzle is provided with dust-proof cushion.

Work process:

After driver steps on pedal, act on push rod, tip-lever support is descending first under push rod effect, first to one-level balancing spring Effect so as to compress with tip-lever support descending, after the completion of its stroke l1, the first body of rod lower surface of tip-lever support with two grades Balancing spring upper-end contact, then one-level balancing spring and two grades of balancing spring cooperation；

For further description structure herein, need to select suitable one-level balancing spring and two grades of equilibrium bombs Spring, the rigidity of described one-level balancing spring is more than the rigidity of two grades of balancing springs, and this dummy piston assembly is installed rear stage and put down The lower flange of spring bag card is pressed onto the lower surface of width disk chamber by weighing apparatus spring；First act on one-level to put down so when tip-lever support is descending Weighing apparatus spring, simultaneously acts on firsts and seconds balancing spring, it acts on two springs side by side again after the completion for the treatment of the stroke of l1, thus Formed and buffer twice.

Another situation is exactly to select the spring that length is just mated with spring bag card internal height to balance as two grades Spring, thus need not limit the rigidity of two grades of balancing springs, also enable secondary buffer.

After the upper valve in valve body and lower valve are opened, other flowing through first have to be filtered through drainage screen, filter Net is cylindrical shape, is all filtering surface at one week, though just the areas of blockage of mouth of entering also other positions can also breathed freely it is not easy to Block.

Embodiment two: referring to Fig. 2,3-5,7,8-11, in figure a kind of liberation 141 main brake valves with drainage screen, include lead to Cross the upper valve body being bolted together, lower valve body,

The described external diameter of balancing spring second is mated with the internal diameter of spring bag card, the described internal diameter of balancing spring second and The diameter matches of bipole body；The described internal diameter of balancing spring first is mated with the external diameter of spring bag card；Described balancing spring third For rubber spring.

The lower end of described exhaust nozzle is provided with dust-proof cushion.

Work process:

After driver steps on pedal, act on push rod, tip-lever support is descending first under push rod effect, first balancing spring first is made With so as to compress with tip-lever support descending, after the completion of its stroke l1, the 3rd body of rod lower end of tip-lever support and balancing spring Third contact, now balancing spring third and balancing spring first collective effect, after the completion of its l2 stroke, under first body of rod of tip-lever support End face and balancing spring second upper-end contact, now balancing spring first, balancing spring third and balancing spring second cooperation；

For further description structure herein, need to select suitable balancing spring first and balancing spring second, institute The rigidity of the balancing spring first stated is more than the rigidity of balancing spring second, and this dummy piston assembly installs back balance spring first by spring The lower flange of bag card is pressed onto the lower surface of width disk chamber；First act on balancing spring first so when tip-lever support is descending, treat l2's Simultaneously act on again after the completion of stroke balancing spring first, second, third, its effects side by side of three springs.

Another situation is exactly to select spring that length just mated with spring bag card internal height as balancing spring Second, thus need not limit the rigidity of balancing spring second.

Claims

1. a kind of liberation 141 main brake valves with drainage screen, including the upper valve body being bolted together, lower valve body,

Described upper valve body upper end is provided with torque arm seat, Middle face is provided with opening on torque arm seat, is provided with upper end in this opening The cylindrical slide sleeve of closing, sliding sleeve can move up and down in opening；It is hinged in the middle part of torque arm on the support otic placode on torque arm seat, torque arm Upper end is provided with the upper end that rotatable pinch roller is pressed in sliding sleeve, and torque arm lower end is provided with the adjusting screw withstanding on torque arm seat side and locking Nut；

It is provided with secondary points in this dummy piston within the chamber to stop dummy piston assembly, including dummy piston body, spring bag card, push rod Seat, the top of dummy piston body is columnar width disk chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is the body of rod Chamber；The top of described tip-lever support is width disk, and bottom is attenuate successively the three sections of step bodies of rod stretching out from width disk, from upper past Under be followed successively by first body of rod, second body of rod, the 3rd body of rod, the hypomere of the 3rd body of rod inserts the body of rod chamber of dummy piston body bottom Interior, width disk is arranged on the width disk within the chamber in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, is located at Between the inwall of the step body of rod of tip-lever support and dummy piston body width disk chamber, the upper end of spring bag card is provided with inside annular Flange, lower end is provided with flange under outside annular；Spring bag card outer cover supports equipped with one-level balancing spring, one-level balancing spring Under the lower surface of tip-lever support width disk and spring bag snap ring shape between flange upper surface；Between spring bag card inwall and the step body of rod It is provided with two grades of balancing springs, the lower end of two grades of balancing springs is supported on the lower surface of dummy piston body width disk chamber, put down for two grades The external diameter of the upper end of weighing apparatus spring is more than upper overturning internal diameter, and upper overturning internal diameter is more than or equal to the diameter of first body of rod, two grades of equilibrium bombs The internal diameter of the upper end of spring is less than the diameter of first body of rod；Two grades of balancing spring upper ends to the step surface of the first body of rod lower end away from From for l1, the distance of step surface to the body of rod chamber upper surface of the second body of rod lower end is l2, the upper surface of described spring bag card It is l4, l1 ＜ l2 ＜ l4 with the distance between width disk lower surface；The inside of tip-lever support is provided with push rod chamber, in push rod chamber and sliding sleeve It is provided with push rod between upper surface；

The top of described dummy piston body is provided with the edge turning up, and the lower surface at this edge is put down with the step in upper valve body It is provided with back-moving spring first between the step of weighing apparatus piston chamber；The outer surface of dummy piston body is lived with the step balance in upper valve body The lower inner surface of plug chamber is the face that is slidably matched, and the bottom of the described outer surface of dummy piston body is provided with cannelure, this ring It is provided with sealing ring in shape groove；

The middle part of described upper valve body is upper valve assembly chambeies body, between the outside of upper valve assembly chambeies body and upper valve body housing It is provided with upper interlayer, the top of upper interlayer and dummy piston chamber insertion, upper valve assembly chambeies side portion is provided with and protrudes horizontally up upper valve The enterprising QI KOU of body shell body, the sidepiece of upper valve body is additionally provided with the upper gas outlet protruding horizontally up and communicating with upper interlayer；In upper valve The top of assembly cavity is provided with the upper valve aperture of door that inside flange is formed, and the bottom of this upper valve aperture of door and described dummy piston body is stretched The external end head position of the body of rod chamber going out corresponds to, and the diameter of this external end head with diameter greater than body of rod chamber for upper valve aperture of door, In upper valve assembly chambeies body, portion is provided with valve member；

Upper valve member includes the upper valve of tubular and the upper valve seat of annular, and upper valve seat is sleeved on upper valve outdoors, upper valve For the face that is slidably matched between the inwall of seat and the outer wall of upper valve, and it is provided with sealing structure；Upper valve seat is arranged on by jump ring The lower end of upper valve component chambers；It is the face that is slidably matched between the inwall of the outer wall of upper valve seat and upper valve assembly chambeies body, and It is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively in upper valve end inside and outside this annular disk body Portion forms in-flanges and flanging, is provided with valve spring between this flanging lower surface and upper surface of upper valve seat；On The upper surface of the annular disk body of valve upper end is provided with sealing gasket for valve, is provided with two convex annular in the upper surface of this sealing gasket Rise, the annular protrusion in outside cooperatively forms valve on-off structure with the edge in valve hole, and the annular protrusion of inner side is lived with balance The outer face of the body of rod chamber of plug bottom forms valve venting on-off structure；In upper valve spring outside and upper valve assembly chambeies It is provided with upper valve core drainage screen, this valve element drainage screen includes the annular end-rack on top and the annular end of bottom between internal wall Frame, is connected to the support column between upper and lower annular end-rack, inside support column or outside is provided with columnar filter screen, this filter The upper end of net is connected with the circular end-rack on top, and the lower end of this filter screen is connected with the annular end-rack of bottom, described valve element mistake The cross section that the annular end-rack on filter screen top is connected with ringwise is the upper sealing strip edge of wedge shape, the upper end on sealing strip edge on this Face high outside and low outside in the conical surface, upper sealing strip along and the annular end-rack on top between for flexible connection；The annulus of described bottom Shape end-rack is connected with the lower sealing strip edge that cross section ringwise is wedge shape, the lower surface on this lower sealing strip edge outer low and inner high in cone Face, for flexible connection between lower sealing strip edge and the annular end-rack of bottom；The upper surface on upper sealing strip edge and upper valve aperture of door Lower surface contact, the lower surface on lower sealing strip edge and the upper surface of upper valve seat；

Upper valve body bottom is relay piston chamber, and relay piston chamber interior is provided with relay piston, and relay piston includes center Vertical hollow rod body and the piston body being connected to around the body of rod, in piston body outer cover equipped with piston bush, the inwall of piston bush and It is the face that is slidably matched between the outer wall of piston body, piston bush is the face that is slidably matched with the inwall of relay piston chamber；Relay piston Hollow rod body upper end pass from the middle part of upper valve corresponding with the body of rod chamber lower end of dummy piston；The lower surface of piston body It is provided with spring between lower valve body upper end；

The top of lower valve body is lower valve assembly cavity, under being provided between the outside of lower valve assembly cavity and lower valve body housing Interlayer, the top of lower interlayer and lower piston chamber insertion, lower valve assembly cavity side portion is provided with and protrudes horizontally up under lower valve body Air inlet, the sidepiece of lower valve body is additionally provided with the lower gas outlet protruding horizontally up and communicating with lower interlayer；In lower valve assembly cavity Top is provided with the lower valve aperture of door that inside flange is formed, the hollow rod body lower end position of this lower valve aperture of door and described relay piston Corresponding, and this lower valve bore dia is more than the diameter of the hollow rod body lower end of relay piston, in lower valve assembly chambeies body Portion is provided with lower valve assembly；

Lower valve assembly includes the lower valve of tubular and the lower valve gate seat of annular, and lower valve cover for seat is contained in lower valve outdoors, lower valve For the face that is slidably matched between the inwall of seat and the outer wall of lower valve, and it is provided with sealing structure；The outer wall of lower valve gate seat and lower valve It is the face that is slidably matched between the inwall of assembly cavity, and be provided with sealing structure；The upper end of described lower valve is annular disk body, at this Form in-flanges and flanging in lower valve end respectively, in this flanging lower surface and lower valve inside and outside annular disk body It is provided with lower valve spring between the upper surface of seat；The upper surface of the annular disk body of lower valve upper end is provided with lower valve door seal, The upper surface of this sealing gasket is provided with two annular protrusions, and the annular protrusion in outside cooperatively forms lower valve with the edge of lower valve aperture of door On-off structure, the annular protrusion of inner side forms lower valve venting on-off structure with the hollow rod body lower end of relay piston；Under Valve spring is outside to be provided with bottom spool drainage screen and lower valve assembly cavity inner wall between, and this valve element drainage screen includes the circle on top The annular end-rack of annular end-rack and bottom, is connected to the support column between upper and lower annular end-rack, inside support column or Outside is provided with columnar filter screen, and the upper end of this filter screen is connected with the circular end-rack on top, the lower end of this filter screen and the circle of bottom Annular end-rack connects, and the cross section that the annular end-rack on described valve element drainage screen top is connected with ringwise is the upper close of wedge shape Edge sealing edge, on this upper surface on sealing strip edge high outside and low outside in the conical surface, upper sealing strip along and the annular end-rack on top between is Flexible connection；The cross section that the annular end-rack of described bottom is connected with ringwise is the lower sealing strip edge of wedge shape, close under this The lower surface on edge sealing edge outer low and inner high in the conical surface, lower sealing strip along and the annular end-rack of bottom between for flexible connection；Upper close The upper surface on edge sealing edge is contacted with the lower surface of lower valve aperture of door, and the lower surface on lower sealing strip edge and the upper surface of lower valve gate seat connect Touch；

Be provided with exhaust nozzle chamber in lower valve body bottom, and exhaust nozzle be installed with by jump ring, this exhaust nozzle include outer tube and Inner core, the outer tube of exhaust nozzle is supported on the lower end of lower valve cover for seat, and inner core is sleeved on inside lower valve, the outer wall of inner core and lower valve For the face that is slidably matched between the inwall of door.

2. liberation according to claim 1 141 main brake valves with drainage screen, is characterized in that: two grades of described equilibrium bombs The external diameter of spring is mated with the internal diameter of spring bag card, the diameter matches of the described internal diameter of two grades of balancing springs and second body of rod；Institute The internal diameter of one-level balancing spring stated is mated with the external diameter of spring bag card；Described width disk lower surface is provided with outside first body of rod Annular groove；This annular groove width is mated with the width of the upper end of spring bag card.

3. liberation according to claim 1 141 main brake valves with drainage screen, is characterized in that: described valve element drainage screen The annular end-rack on top, the annular end-rack of bottom, support column, upper sealing strip edge, lower sealing strip edge are integrated injection molding The plastic material of type, described cylindrical filter net is stainless steel, and the upper end of drainage screen is hot with the annular end-rack on top Molten connection, the annular end-rack hot-melt adhesive paste of the lower end of drainage screen and bottom, the side of drainage screen and support column hot-melt adhesive paste；Institute The cross-sectional width of the connecting portion between the upper airtight edge stated and the annular end-rack on top is b1, the annular end-rack on top Cross-sectional width b2, b1 is not more than the 1/3 of b2；Connecting portion between airtight edge and the annular end-rack of bottom under described Cross-sectional width is b3, cross-sectional width b4 of the annular end-rack of bottom, and b3 is not more than the 1/3 of b4.

4. liberation according to claim 1 141 main brake valves with drainage screen, is characterized in that: the lower end of described exhaust nozzle Dust-proof cushion is installed.

5. a kind of liberation 141 main brake valves with drainage screen, including the upper valve body being bolted together, lower valve body,

The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step, and dummy piston within the chamber is provided with three-level point and stops Dummy piston assembly,

The top of dummy piston body is columnar width disk chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is the body of rod Chamber；

The top of described tip-lever support is width disk, and bottom is attenuate successively the three sections of step bodies of rod stretching out from width disk, from upper past Under be followed successively by first body of rod, second body of rod, the 3rd body of rod, the hypomere of the 3rd body of rod inserts the body of rod chamber of dummy piston body bottom Interior, width disk is arranged on the width disk within the chamber in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, is located at Between the inwall of the step body of rod of tip-lever support and dummy piston body width disk chamber, the upper end of spring bag card is provided with inside annular Flange, lower end is provided with flange under outside annular；Equipped with balancing spring first, balancing spring first is supported on top to spring bag card outer cover Under the lower surface of pole socket width disk and spring bag card arc between flange upper surface；It is provided between spring bag card inwall and the step body of rod Balancing spring second, the lower end of balancing spring second is supported on the lower surface of dummy piston body width disk chamber, balancing spring second upper End external diameter be less than upper overturning diameter, upper overturning internal diameter be more than or equal to first body of rod diameter, the upper end of balancing spring second interior Footpath is less than the diameter of first body of rod；It is provided with balancing spring third in body of rod within the chamber,

The distance of the step surface to the first body of rod lower end for the balancing spring second upper end is l1, and the step surface of the second body of rod lower end is to the body of rod The distance of chamber upper surface is l3, and the distance between upper end of balancing spring third to the 3rd body of rod lower surface is l2, described bullet The distance between the upper surface of spring bag card and width disk lower surface are l, 4, l1 ＜ l2 ＜ l3 ＜ l4；

6. liberation according to claim 5 141 main brake valves with drainage screen, is characterized in that: described balancing spring second External diameter mate with the internal diameter of spring bag card, the diameter matches of the described internal diameter of balancing spring second and second body of rod；Described The internal diameter of balancing spring first is mated with the external diameter of spring bag card；Described balancing spring third is rubber spring；Under described width disk Surface is provided with annular groove outside first body of rod；This annular groove width is mated with the width of the upper end of spring bag card.

7. liberation according to claim 5 141 main brake valves with drainage screen, is characterized in that: described valve element drainage screen The annular end-rack on top, the annular end-rack of bottom, support column, upper sealing strip edge, lower sealing strip edge are integrated injection molding The plastic material of type, described cylindrical filter net is stainless steel, and the upper end of drainage screen is hot with the annular end-rack on top Molten connection, the annular end-rack hot-melt adhesive paste of the lower end of drainage screen and bottom, the side of drainage screen and support column hot-melt adhesive paste；Institute The cross-sectional width of the connecting portion between the upper airtight edge stated and the annular end-rack on top is b1, the annular end-rack on top Cross-sectional width b2, b1 is not more than the 1/3 of b2；Connecting portion between airtight edge and the annular end-rack of bottom under described Cross-sectional width is b3, cross-sectional width b4 of the annular end-rack of bottom, and b3 is not more than the 1/3 of b4.

8. liberation according to claim 5 141 main brake valves with drainage screen, is characterized in that: the lower end of described exhaust nozzle Dust-proof cushion is installed.