CN204172888U - For secondary and three grades of cadence braking master valves of prestige series difficult to understand - Google Patents

Abstract

The utility model discloses a kind of secondary for prestige series difficult to understand and three grades of cadence braking master valves, comprise seal be fixed together pedal base, upper body and lower body, dummy piston is set with on the top of upper intracoelomic cavity, spring cutting ferrule outer cover is equipped with one-level balance spring, and internal sleeve is equipped with secondary balance spring; Secondary balance spring upper end is L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L3 to the distance of body of rod chamber upper surface, distance between the upper surface of spring cutting ferrule and width dish lower surface is L2, meets L1 < L3 < L2.The utility model adopts upper, annular in-flanges, and the structure of lower annular flanging, simplifies the structure of spring cutting ferrule, reduces difficulty of processing and assembly difficulty, can the qualification rate of significantly improving product.In the utility model, spring cutting ferrule can pass through cutting straight forming, also one-time formed processing can be carried out by Sheet Metal Forming Technology, the course of processing is simple, reduces costs less than 1/10th to original paper, and the spring fitting of spring cutting ferrule inside is also simple many simultaneously.

Description

For secondary and three grades of cadence braking master valves of prestige series difficult to understand

Technical field

The utility model relates to the parts technical field of brake valve of car, specifically a kind of secondary for prestige series difficult to understand and three grades of cadence braking master valves.

Background technology

The brake system of truck of the prior art and heavy goods vehicles is too anxious, the bad control of feel, brake facing is easily caused to heat up rapidly, cause carbonization, directly have influence on braking effect, it is too urgent to brake, also can cause partially sliding, affect resistance to overturning, thus produce insecurity, or unnecessary economic loss.Problem during in order to solve these brakes of truck, the series of patents of the two-stage cadence braking master valve that our unit successively proposes and three grades of dummy piston assemblies, such as publication number is the utility model patent of CN 101837774 A, can export " secondary points is stopped "." point is stopped " principle can make pressurized air, forms pulse, be applied to brake facing in the control gentle room of pipeline section, and every subpulse is all equivalent to instrument wiping brake facing.Not only can accomplish that brake hubs is combined effectively with brake facing, and further improve brake facing carbonization to a great extent or form adamantine layer, thus avoid the phenomenon of poor stop to occur, reach good braking effect.Critical component in above-mentioned patent is spring cutting ferrule, and because spring cutting ferrule shape matching is special, processing technology is complicated, and to need after casting fine limit work on lathe, cost is higher.The precision dimensional characteristic of this spring cutting ferrule is high, very high through inspection fraction defect after manufacture.In addition, because each part fits is poor, also there is the problem of mounting process complexity, after installing, test performance is different, and systematicness is poor, haves much room for improvement.

Utility model content

In order to solve the problems referred to above that existing some braking system exists, the utility model proposes a kind of secondary for prestige series difficult to understand and three grades of cadence braking master valves, reaching with simplified structure, reduce costs object, also improving braking effect by arranging speed bump.

The technical solution of the utility model is: a kind of two-stage cadence braking master valve for prestige series difficult to understand, comprise pedal, pedal base, tappet and valve, and admission port and air extractor duct, comprise successively from top to bottom seal be fixed together pedal base, upper body and lower body, wherein, pedal base central upper portion is set with sliding sleeve, and the sealing of sliding sleeve inner chamber upper end also compresses mutually with tappet upper end; Described pedal in pedal base side, pedal is provided with the bearing pin and flat gasket that coordinate with sliding sleeve upper end and compress by hinge; The top of intracoelomic cavity is set with dummy piston on described, and the upper end of dummy piston outwards arranges flange, is supported with retracing spring between this flange lower surface and upper body intracavity bottom; Dummy piston upper end and upper body are fixed together by the spacing back-up ring of annular, this spacing back-up ring is provided with annular exterior bayonet slot, the upper end of spacing back-up ring is fixed on upper body inwall by circlip, described plunger cap upper end center is provided with annular inner card cage, the outer rim of the taper dust-proof cushion of a hollow and inner edge are respectively arranged with chuck in the outer chuck of annular and annular, the annular of taper dust boot outward in chuck and annular chuck be fastened in described exterior bayonet slot and inner card cage respectively; The top of dummy piston is columnar width dish chamber A, and the cavity shape projection that the bottom of dummy piston is stretched out is body of rod chamber B; The top of described plunger cap is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, be followed successively by first body of rod, second body of rod and the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber B of dummy piston bottom, and width dish is arranged in the width dish chamber A in dummy piston by jump ring; Described spring cutting ferrule is columnar structured, is arranged in the width dish chamber A of dummy piston, and the upper end of spring cutting ferrule is inwardly provided with and continuous print annular upper overturning, and lower end is outwards provided with and flange under continuous print annular; Spring cutting ferrule outer cover is equipped with one-level balance spring, and one-level balance spring to be supported under the lower surface of plunger cap width dish and Spring Card collar-shaped between flange upper surface; Spring cutting ferrule internal sleeve is equipped with secondary balance spring, the lower end of secondary balance spring is supported on the lower surface of dummy piston width dish chamber A, the external diameter of the upper end of secondary balance spring is greater than annular upper overturning internal diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of secondary balance spring is less than the diameter of first body of rod; The elasticity modulus of one-level balance spring is greater than the elasticity modulus of secondary balance spring; Secondary balance spring upper end is L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L3 to the distance of body of rod chamber B upper surface, distance between the upper surface of described spring cutting ferrule and width dish lower surface is L2, L1 < L3 < L2; The external diameter of described secondary balance spring mates with the internal diameter of spring cutting ferrule, the internal diameter of described secondary balance spring and the diameter matches of second body of rod; The internal diameter of described one-level balance spring mates with the external diameter of spring cutting ferrule; Mutually compress bottom the lower end of described tappet and the central pit hole of plunger cap; The bottom of intracoelomic cavity is provided with the upper valve wall of annular on described, and the inner chamber of upper valve wall is communicated with upper air extractor duct, and the exocoel of upper valve wall is communicated with enterprising gas port; In upper valve wall inner chamber, sealing shroud is equipped with the upper valve of cylindrical shape and upper valve seat, the upper end of upper valve is provided with outward flanging and upper valve port force fit, be supported with spring between the downside of this outward flanging and upper valve seat, upper valve seat is fixed in the inner side of upper valve wall by circlip; In described lower intracoelomic cavity, be provided with the lower valve wall of annular, the inner chamber of lower valve wall is communicated with lower air extractor duct, and the exocoel of lower valve wall is communicated with lower admission port; In lower valve wall inner chamber, sealing shroud is equipped with lower valve and the lower valve seat of cylindrical shape, the upper end of lower valve is provided with outward flanging and lower valve mouth force fit, be supported with spring between the downside of this outward flanging and lower valve seat, lower valve seat is fixed in the inner side of lower valve wall by circlip; Be set with the relay piston of hollow at described upper body sealed bottom, the bottom of described dummy piston controls upper valve member opening and closing, and the bottom of relay piston controls the opening and closing of lower valve assembly.The inner chamber upper end of described relay piston is provided with admission port, and bottom the body of rod chamber B of dummy piston, be provided with exhausr port, this exhausr port is communicated with the admission port of relay piston upper end; In lower valve inner chamber lower end, sealing shroud is equipped with exhausr port, and this exhausr port center is provided with dust-proof cushion.Between described spacing back-up ring and circlip, be set with the dust boot of taper, the center of the dust boot of this taper is contained in above plunger cap.Fix between sliding sleeve and pedal base and have dust protecting cap.

A kind of three grades of cadence braking master valves for prestige series difficult to understand, comprise pedal, pedal base, tappet and valve, and air inlet and air extractor duct, comprise successively from top to bottom seal be fixed together pedal base, upper body and lower body, wherein, pedal base central upper portion is set with sliding sleeve, and the sealing of sliding sleeve inner chamber upper end also compresses mutually with tappet upper end; Described pedal in pedal base side, pedal is provided with the bearing pin and flat gasket that coordinate with sliding sleeve upper end and compress by hinge; The top of intracoelomic cavity is set with dummy piston on described, and the upper end of dummy piston outwards arranges flange, is supported with retracing spring between this flange lower surface and upper body intracavity bottom; Dummy piston upper end and upper body are fixed together by the spacing back-up ring of annular, this spacing back-up ring is provided with annular exterior bayonet slot, the upper end of spacing back-up ring is fixed on upper body inwall by circlip, described plunger cap upper end center is provided with annular inner card cage, the outer rim of the taper dust-proof cushion of a hollow and inner edge are respectively arranged with chuck in the outer chuck of annular and annular, the annular of taper dust boot outward in chuck and annular chuck be fastened in described exterior bayonet slot and inner card cage respectively; The top of dummy piston is columnar width dish chamber A, and the cavity shape projection that the bottom of dummy piston is stretched out is body of rod chamber B; The top of described plunger cap is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, be followed successively by first body of rod, second body of rod and the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber B of dummy piston bottom, and width dish is arranged in the width dish chamber A in dummy piston by jump ring; Described spring cutting ferrule is columnar structured, is arranged in the width dish chamber A of dummy piston, and the upper end of spring cutting ferrule is inwardly provided with and continuous print annular upper overturning, and lower end is outwards provided with and flange under continuous print annular; Spring cutting ferrule outer cover is equipped with one-level balance spring, and one-level balance spring to be supported under the lower surface of plunger cap width dish and Spring Card collar-shaped between flange upper surface; Spring cutting ferrule internal sleeve is equipped with secondary balance spring, the lower end of secondary balance spring is supported on the lower surface of dummy piston width dish chamber A, the external diameter of the upper end of secondary balance spring is greater than annular upper overturning internal diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of secondary balance spring is less than the diameter of first body of rod; The elasticity modulus of one-level balance spring is greater than the elasticity modulus of secondary balance spring; Three grades of balance springs are provided with in body of rod chamber B, secondary balance spring upper end is L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L3 to the distance of body of rod chamber B upper surface, the upper end of three grades of balance springs is L4 to the distance between the 3rd body of rod lower surface, distance between the upper surface of described spring cutting ferrule and width dish lower surface is L2, L1 < L4 < L3 < L2; The external diameter of described secondary balance spring mates with the internal diameter of spring cutting ferrule, the internal diameter of described secondary balance spring and the diameter matches of second body of rod; The internal diameter of described one-level balance spring mates with the external diameter of spring cutting ferrule; Mutually compress bottom the lower end of described tappet and the central pit hole of plunger cap; The bottom of intracoelomic cavity is provided with the upper valve wall of annular on described, and the inner chamber of upper valve wall is communicated with upper air extractor duct, and the exocoel of upper valve wall is communicated with enterprising gas port; In upper valve wall inner chamber, sealing shroud is equipped with the upper valve of cylindrical shape and upper valve seat, the upper end of upper valve is provided with outward flanging and upper valve port force fit, be supported with spring between the downside of this outward flanging and upper valve seat, upper valve seat is fixed in the inner side of upper valve wall by circlip; In described lower intracoelomic cavity, be provided with the lower valve wall of annular, the inner chamber of lower valve wall is communicated with lower air extractor duct, and the exocoel of lower valve wall is communicated with lower admission port; In lower valve wall inner chamber, sealing shroud is equipped with lower valve and the lower valve seat of cylindrical shape, the upper end of lower valve is provided with outward flanging and lower valve mouth force fit, be supported with spring between the downside of this outward flanging and lower valve seat, lower valve seat is fixed in the inner side of lower valve wall by circlip; Be set with the relay piston of hollow at described upper body sealed bottom, the bottom of described dummy piston controls upper valve member opening and closing, and the bottom of relay piston controls the opening and closing of lower valve assembly.The inner chamber upper end of described relay piston is provided with admission port, and bottom the body of rod chamber B of dummy piston, be provided with exhausr port, this exhausr port is communicated with the admission port of relay piston upper end; In lower valve inner chamber lower end, sealing shroud is equipped with exhausr port, and this exhausr port center is provided with dust-proof cushion.Between described spacing back-up ring and circlip, be set with the dust boot of taper, the center of the dust boot of this taper is contained in above plunger cap.Fix between sliding sleeve and pedal base and have dust protecting cap.

Technique effect of the present utility model is:

1, the utility model is used for the secondary of prestige series difficult to understand and the spring cutting ferrule of three grades of cadence braking master valves, adopt the continuous in-flanges of upper, annular, the structure of the continuous flanging of lower annular, simplifies the structure of spring cutting ferrule, difficulty of processing is reduced greatly, can the qualification rate of significantly improving product.

2, in the utility model, spring cutting ferrule can pass through cutting straight forming, also one-time formed processing can be carried out by Sheet Metal Forming Technology, the course of processing is simple, reduces costs less than 1/10th to original paper, and the spring fitting of spring cutting ferrule inside is also simple many simultaneously.

Accompanying drawing explanation

Fig. 1 is the utility model two-stage cadence braking master valve structural representation;

Fig. 2 is the birds-eye view of Fig. 1;

Fig. 3 is that secondary points is stopped dummy piston assembly structure schematic diagram;

Fig. 4 is the main TV structure schematic diagram of spring cutting ferrule;

Fig. 5 is the cross-sectional view of dummy piston;

Fig. 6 is the A-A cross-sectional view of Fig. 4;

Fig. 7 is the main TV structure schematic diagram of plunger cap;

Fig. 8 is the B-B cross-sectional view of Fig. 7;

Fig. 9 is the utility model three grades of cadence braking master valve structural representations;

Figure 10 is that three grades of points in Fig. 9 are stopped dummy piston assembly structure schematic diagram.

In figure on 1. dust-proof cushion 2. exhausr port 3. circlip 4.O type circle 5. valve seat 6.O type circle 7. lower valve seat 8. lower body 9. lower valve spring 10. relay piston 11.O type circle 12.O type circle 16. circlip 17.O type circle 18.O type circles 19. on valve seat 20. on valve spring 21.O type circle 22. retracing spring 23. bolt 24. upper body 25. spacing back-up ring 26. dust boot 27. circlip 28. pedal base 29. tappet 30. sliding sleeve 31. dust protecting cap 32. bolt 33.O type circle 34. lower valve 35.O type circle 36. valve 37. dummy piston 38. plunger cap 39. one-level balance spring (pre-compressed spring) 40. spring cutting ferrule 41. secondary balance spring 42. adjust screw 43. jam nut 44. pedal 45. slipmat 46. bearing pin 47. flat gasket 48. spring cotter 49. roller 50. bearing pin 51. flat gasket 52. spring cotter 53. elasticity backing pin, valve wall on 54., 55. lower valve walls, air extractor duct 59. times admission ports 60. times air extractor ducts 61. 3 grades of balance spring 62. annular housings on 56. enterprising gas ports 57..3801. width dishes, 3802. annular grooves, 3803. first bodies of rod, 3804. second bodies of rod, 3805. the 3rd bodies of rod, 4001. annular upper overturnings, the lower flange of 4002. annulars.

Detailed description of the invention

Embodiment 1: a kind of two-stage cadence braking master valve for prestige series difficult to understand, see Fig. 1 and Fig. 2, comprises the pedal base 28, upper body 2413 and lower body 8 etc. that seal and be fixed together from top to bottom successively.

Wherein, the top of pedal base 28 upwards extends to tubulose, and its center is set with sliding sleeve 30, between sliding sleeve 30 and pedal base 28, fix dust protecting cap 31.

Pedal 44 is hinged on the side of pedal base 28 by bearing pin 46, pedal 44 is provided with the bearing pin 50 and flat gasket 51 that coordinate with sliding sleeve 30 upper end and compress.

The inner chamber upper end of sliding sleeve 30 seals and mutually compresses with the upper end of tappet 29, mutually compresses bottom the lower end of tappet 29 and the central pit hole of plunger cap 39.

Be set with dummy piston 37 on the inner chamber top of upper body 24, the upper end of dummy piston 37 outwards arranges flange, is supported with retracing spring 22 between this flange lower surface and upper body intracavity bottom; Dummy piston 37 upper end and upper body are fixed together by the spacing back-up ring of annular, and the upper end of this spacing back-up ring is fixed on upper body inwall by circlip; Between described spacing back-up ring and circlip, be set with the dust boot 31 of taper, the center of the dust boot 31 of this taper is contained in above plunger cap 38.

See Fig. 4, the top of dummy piston is columnar width dish chamber A, and the cavity shape projection that the bottom of dummy piston is stretched out is body of rod chamber B.

See Fig. 7 and Fig. 8, the top of plunger cap 38 is width dish 3801, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish 3801, be followed successively by first body of rod 3803, second body of rod 3804 and the 3rd body of rod 3805 from top to down, the hypomere of the 3rd body of rod 3805 inserts in the body of rod chamber B of dummy piston 37 bottom, and the upper end of width dish 3801 is sleeved on by jump ring 53 in the width dish chamber A in dummy piston 37.

See Fig. 5 and Fig. 6, spring cutting ferrule 40 is columnar structured, is arranged in the width dish chamber A of dummy piston 37, and the upper end of spring cutting ferrule 40 is inwardly provided with and continuous print annular upper overturning 4001, and lower end is outwards provided with and flange 4002 under continuous print annular.

Fig. 3 is the constructional drawing of two-stage cadence braking master valve, and spring cutting ferrule 40 outer cover is equipped with one-level balance spring 39, and one-level balance spring 39 to be supported under width dish 3801 lower surface of plunger cap 38 and the annular of spring cutting ferrule 40 between flange 4002 upper surface; Spring cutting ferrule 40 internal sleeve is equipped with secondary balance spring 41, the lower end of secondary balance spring 41 is supported on the lower surface of width dish chamber A of dummy piston 37, the external diameter of secondary balance spring 41 upper end is greater than the internal diameter of annular upper overturning 4001, the internal diameter of annular upper overturning 4001 is more than or equal to the diameter of first body of rod 3803, and the internal diameter of secondary balance spring 41 upper end is less than the diameter of first body of rod 3803; The elasticity modulus of one-level balance spring 39 is greater than the elasticity modulus of secondary balance spring 41; The upper end of secondary balance spring 41 is L1 to the distance of the step surface of the first body of rod 3803 lower end, the step surface of the second body of rod 3804 lower end is L3 to the distance of body of rod chamber B upper surface, distance between the upper surface of described spring cutting ferrule 40 and the lower surface of width dish 3801 is L2, meets L1 < L3 < L2.

Further, the external diameter of secondary balance spring 41 mates with the internal diameter of spring cutting ferrule 40, the internal diameter of secondary balance spring 41 and the diameter matches of second body of rod 3804; The internal diameter of described one-level balance spring 39 mates with the external diameter of spring cutting ferrule 40; Mutually compress bottom the lower end of described tappet 29 and the central pit hole of plunger cap 38.

See Fig. 1, be provided with the upper valve wall 54 of annular in the bottom of upper body 24 inner chamber, the inner chamber of upper valve wall 54 is communicated with upper air extractor duct 58, and the exocoel of upper valve wall 54 is communicated with enterprising gas port 57; In upper valve wall 54 inner chamber, sealing shroud is equipped with upper valve 36 and the upper valve seat 18 of cylindrical shape, the upper end of upper valve 36 is provided with outward flanging and upper valve port force fit, be supported with spring 20 between the downside of this outward flanging and upper valve seat 18, upper valve seat 18 is fixed in the inner side of upper valve wall 54 by circlip.

Be provided with the lower valve wall 55 of annular in the inner chamber of lower body 8, the inner chamber of lower valve wall 55 is communicated with lower air extractor duct 60, and the exocoel of lower valve wall 55 is communicated with lower admission port 59; In lower valve wall 55 inner chamber, sealing shroud is equipped with lower valve 34 and the lower valve seat 7 of cylindrical shape, the upper end of lower valve 34 is provided with outward flanging and lower valve mouth force fit, be supported with spring 9 between the downside of this outward flanging and lower valve seat 7, lower valve seat 7 is fixed in the inner side of lower valve wall 55 by circlip.

Be set with the relay piston 10 of hollow at upper body 24 sealed bottom, the bottom of described dummy piston 37 controls upper valve member opening and closing, and the bottom of relay piston 10 controls the opening and closing of lower valve assembly.

The inner chamber upper end of the relay piston 10 in Fig. 1 is provided with admission port, and bottom the body of rod chamber B of dummy piston 37, be provided with exhausr port, this exhausr port is communicated with the admission port of relay piston 10 upper end; In lower valve 34 inner chamber lower end, sealing shroud is equipped with exhausr port 2, and this exhausr port 2 center is provided with dust-proof cushion 1.

Embodiment 2: a kind of three grades of cadence braking master valves for prestige series difficult to understand, content is substantially the same manner as Example 1, and difference is: see Fig. 9, and dummy piston unit replacement of secondary points being stopped is that three grades of points are stopped dummy piston assembly.See Figure 10, these three grades of somes dummy piston assembly of stopping comprises dummy piston 37, spring cutting ferrule 40, plunger cap 38, and the top of dummy piston 37 is columnar width dish chamber A, and the cavity shape projection that the bottom of dummy piston 37 is stretched out is body of rod chamber B; The top of described plunger cap 38 is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish 3801, be followed successively by first body of rod 3803, second body of rod 3804, the 3rd body of rod 3805 from top to down, the hypomere of the 3rd body of rod 3805 inserts in the body of rod chamber B of dummy piston 37 bottom, and width dish 3801 is sleeved in the width dish 3801 chamber A in dummy piston 37 by jump ring; Described spring cutting ferrule 40 is columnar structured, between the step body of rod and the inwall of dummy piston 37 width dish 3801 chamber A of plunger cap 38, the upper end of spring cutting ferrule 40 is inwardly provided with and continuous print annular upper overturning 4001, and lower end is outwards provided with and flange under continuous print annular; Spring cutting ferrule 40 outer cover is equipped with one-level balance spring 39, and one-level balance spring 39 to be supported under the lower surface of plunger cap 38 width dish 3801 and the annular of spring cutting ferrule 40 between flange 4002 upper surface; Secondary balance spring 41 is provided with between the inwall of spring cutting ferrule 40 and the step body of rod of plunger cap 38, the lower end of secondary balance spring 41 is supported on the lower surface of dummy piston 37 width dish 3801 chamber A, the external diameter of the upper end of secondary balance spring 41 is less than annular upper overturning 4001 diameter, annular upper overturning 4001 internal diameter is more than or equal to the diameter of first body of rod 3803, and the internal diameter of the upper end of secondary balance spring 41 is less than the diameter of first body of rod 3803; Three grades of balance springs are provided with in body of rod chamber B,

Secondary balance spring 41 upper end is L1 to the distance of the step surface of the first body of rod 3803 lower end, the step surface of the second body of rod 3804 lower end is L3 to the distance of body of rod chamber B upper surface, the upper end of three grades of balance springs is L4 to the distance between the 3rd body of rod 3805 lower surface, distance between the upper surface of described spring cutting ferrule 40 and width dish 3801 lower surface is L4, L1 < L4 < L3 < L2.If the distance of L2 is too short, then L3, L4 and L1 will be inoperative.

The external diameter of described secondary balance spring 41 mates with the internal diameter of spring cutting ferrule 40, the internal diameter of described secondary balance spring 41 and the diameter matches of second body of rod 3804; The internal diameter of described one-level balance spring 39 mates with the external diameter of spring cutting ferrule 40.Such one-level balance spring 39 and secondary balance spring 41 all give axial location, avoid its horizontal looseness, ensure the stability of work.

Described width dish 3801 lower surface is provided with annular groove outside first body of rod 3803; This annular groove width mates with the width of the upper end of spring cutting ferrule 40.Annular groove is set like this and can makes more compact structure, reduce the height dimension of whole assembly

The bottom of the outside face of described dummy piston 37 is circumferentially provided with the annular slot caved inward in face, and this annular slot inner seal sleeve is equipped with seal ring.Thus the thickness that can reduce bottom dummy piston 37, prevent from forming pore in its casting process, still cause poorly sealed problem after a polish.

Working process:

Plunger cap 38 is first descending under external force, first one-level balance spring 39 is acted on, it is made to compress with the descending of plunger cap 38, after its stroke L1 completes, 3rd body of rod 3805 lower end of plunger cap 38 contacts with three grades of balance springs, now three grades of balance springs and one-level balance spring 39 combined action, after its L4 stroke completes, first body of rod 3803 lower surface of plunger cap 38 and secondary balance spring 41 upper-end contact, now one-level balance spring 39, three grades of balance springs and secondary balance spring 41 co-operation;

In order to further description structure herein, need to select suitable one-level balance spring 39 and secondary balance spring 41, the rigidity of described one-level balance spring 39 is greater than the rigidity of secondary balance spring 41, and this dummy piston 37 assembly installs the lower surface that the lower flange of spring cutting ferrule 40 is pressed onto width dish 3801 chamber A by rear stage balance spring 39; First act on one-level balance spring 39 when plunger cap 38 is descending like this, after the stroke of L4 completes, act on one-level balance spring 39, secondary balance spring 41 and three grades of balance spring its effects side by side more simultaneously.

Another situation is exactly select the spring that just mates with spring cutting ferrule 40 internal height of length as secondary balance spring 41, so just need not limit the rigidity of secondary balance spring 41.

Claims (6)

1. the two-stage cadence braking master valve for prestige series difficult to understand, comprise comprise successively from top to bottom seal be fixed together pedal base, upper body and lower body, and pedal, tappet and valve, admission port and air extractor duct, it is characterized in that: pedal base central upper portion is set with sliding sleeve, the sealing of sliding sleeve inner chamber upper end also compresses mutually with tappet upper end; Described pedal in pedal base side, pedal is provided with the bearing pin and flat gasket that coordinate with sliding sleeve upper end and compress by hinge; The top of intracoelomic cavity is set with dummy piston on described, and the upper end of dummy piston outwards arranges flange, is supported with retracing spring between this flange lower surface and upper body intracavity bottom; Dummy piston upper end and upper body are fixed together by the spacing back-up ring of annular, this spacing back-up ring is provided with annular exterior bayonet slot, the upper end of spacing back-up ring is fixed on upper body inwall by circlip, described plunger cap upper end center is provided with annular inner card cage, the outer rim of the taper dust-proof cushion of a hollow and inner edge are respectively arranged with chuck in the outer chuck of annular and annular, the annular of taper dust boot outward in chuck and annular chuck be fastened in described exterior bayonet slot and inner card cage respectively; The top of dummy piston is columnar width dish chamber, and the cavity shape projection that the bottom of dummy piston is stretched out is body of rod chamber; The top of described plunger cap is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, be followed successively by first body of rod, second body of rod and the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber of dummy piston bottom, and width dish is arranged in the width dish chamber in dummy piston by jump ring; Described spring cutting ferrule is columnar structured, is arranged in the width dish chamber of dummy piston, and the upper end of spring cutting ferrule is inwardly provided with and continuous print annular upper overturning, and lower end is outwards provided with and flange under continuous print annular; Spring cutting ferrule outer cover is equipped with one-level balance spring, and one-level balance spring to be supported under the lower surface of plunger cap width dish and Spring Card collar-shaped between flange upper surface; Spring cutting ferrule internal sleeve is equipped with secondary balance spring, the lower end of secondary balance spring is supported on the lower surface of dummy piston width dish chamber, the external diameter of the upper end of secondary balance spring is greater than annular upper overturning internal diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of secondary balance spring is less than the diameter of first body of rod; The elasticity modulus of one-level balance spring is greater than the elasticity modulus of secondary balance spring; Secondary balance spring upper end is L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L3 to the distance of body of rod chamber upper surface, distance between the upper surface of described spring cutting ferrule and width dish lower surface is L2, L1 < L3 < L2; The external diameter of described secondary balance spring mates with the internal diameter of spring cutting ferrule, the internal diameter of described secondary balance spring and the diameter matches of second body of rod; The internal diameter of described one-level balance spring mates with the external diameter of spring cutting ferrule; Mutually compress bottom the lower end of described tappet and the central pit hole of plunger cap; The bottom of intracoelomic cavity is provided with the upper valve wall of annular on described, and the inner chamber of upper valve wall is communicated with upper air extractor duct, and the exocoel of upper valve wall is communicated with enterprising gas port; In upper valve wall inner chamber, sealing shroud is equipped with the upper valve of cylindrical shape and upper valve seat, the upper end of upper valve is provided with outward flanging and upper valve port force fit, be supported with spring between the downside of this outward flanging and upper valve seat, upper valve seat is fixed in the inner side of upper valve wall by circlip; In described lower intracoelomic cavity, be provided with the lower valve wall of annular, the inner chamber of lower valve wall is communicated with lower air extractor duct, and the exocoel of lower valve wall is communicated with lower admission port; In lower valve wall inner chamber, sealing shroud is equipped with lower valve and the lower valve seat of cylindrical shape, the upper end of lower valve is provided with outward flanging and lower valve mouth force fit, be supported with spring between the downside of this outward flanging and lower valve seat, lower valve seat is fixed in the inner side of lower valve wall by circlip; Be set with the relay piston of hollow at described upper body sealed bottom, the bottom of described dummy piston controls upper valve member opening and closing, and the bottom of relay piston controls the opening and closing of lower valve assembly.

2. two-stage cadence braking master valve according to claim 1, is characterized in that: the inner chamber upper end of described relay piston is provided with admission port, and the body of rod cavity bottom of dummy piston is provided with exhausr port, and this exhausr port is communicated with the admission port of relay piston upper end; In lower valve inner chamber lower end, sealing shroud is equipped with exhausr port, and this exhausr port center is provided with dust-proof cushion.

3. two-stage cadence braking master valve according to claim 1, is characterized in that: fixing between sliding sleeve and pedal base has dust protecting cap.

4. three grades of cadence braking master valves for prestige series difficult to understand, comprise comprise successively from top to bottom seal be fixed together pedal base, upper body and lower body, and pedal, tappet and valve, admission port and air extractor duct, it is characterized in that: pedal base central upper portion is set with sliding sleeve, the sealing of sliding sleeve inner chamber upper end also compresses mutually with tappet upper end; Described pedal in pedal base side, pedal is provided with the bearing pin and flat gasket that coordinate with sliding sleeve upper end and compress by hinge; The top of intracoelomic cavity is set with dummy piston on described, and the upper end of dummy piston outwards arranges flange, is supported with retracing spring between this flange lower surface and upper body intracavity bottom; Dummy piston upper end and upper body are fixed together by the spacing back-up ring of annular, this spacing back-up ring is provided with annular exterior bayonet slot, the upper end of spacing back-up ring is fixed on upper body inwall by circlip, described plunger cap upper end center is provided with annular inner card cage, the outer rim of the taper dust-proof cushion of a hollow and inner edge are respectively arranged with chuck in the outer chuck of annular and annular, the annular of taper dust boot outward in chuck and annular chuck be fastened in described exterior bayonet slot and inner card cage respectively; The top of dummy piston is columnar width dish chamber, and the cavity shape projection that the bottom of dummy piston is stretched out is body of rod chamber; The top of described plunger cap is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, be followed successively by first body of rod, second body of rod and the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber of dummy piston bottom, and width dish is arranged in the width dish chamber in dummy piston by jump ring; Described spring cutting ferrule is columnar structured, is arranged in the width dish chamber of dummy piston, and the upper end of spring cutting ferrule is inwardly provided with and continuous print annular upper overturning, and lower end is outwards provided with and flange under continuous print annular; Spring cutting ferrule outer cover is equipped with one-level balance spring, and one-level balance spring to be supported under the lower surface of plunger cap width dish and Spring Card collar-shaped between flange upper surface; Spring cutting ferrule internal sleeve is equipped with secondary balance spring, the lower end of secondary balance spring is supported on the lower surface of dummy piston width dish chamber, the external diameter of the upper end of secondary balance spring is greater than annular upper overturning internal diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of secondary balance spring is less than the diameter of first body of rod; The elasticity modulus of one-level balance spring is greater than the elasticity modulus of secondary balance spring; Three grades of balance springs are provided with in body of rod chamber, secondary balance spring upper end is L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L3 to the distance of body of rod chamber upper surface, the upper end of three grades of balance springs is L4 to the distance between the 3rd body of rod lower surface, distance between the upper surface of described spring cutting ferrule and width dish lower surface is L2, L1 < L4 < L3 < L2; The external diameter of described secondary balance spring mates with the internal diameter of spring cutting ferrule, the internal diameter of described secondary balance spring and the diameter matches of second body of rod; The internal diameter of described one-level balance spring mates with the external diameter of spring cutting ferrule; Mutually compress bottom the lower end of described tappet and the central pit hole of plunger cap; The bottom of intracoelomic cavity is provided with the upper valve wall of annular on described, and the inner chamber of upper valve wall is communicated with upper air extractor duct, and the exocoel of upper valve wall is communicated with enterprising gas port; In upper valve wall inner chamber, sealing shroud is equipped with the upper valve of cylindrical shape and upper valve seat, the upper end of upper valve is provided with outward flanging and upper valve port force fit, be supported with spring between the downside of this outward flanging and upper valve seat, upper valve seat is fixed in the inner side of upper valve wall by circlip; In described lower intracoelomic cavity, be provided with the lower valve wall of annular, the inner chamber of lower valve wall is communicated with lower air extractor duct, and the exocoel of lower valve wall is communicated with lower admission port; In lower valve wall inner chamber, sealing shroud is equipped with lower valve and the lower valve seat of cylindrical shape, the upper end of lower valve is provided with outward flanging and lower valve mouth force fit, be supported with spring between the downside of this outward flanging and lower valve seat, lower valve seat is fixed in the inner side of lower valve wall by circlip; Be set with the relay piston of hollow at described upper body sealed bottom, the bottom of described dummy piston controls upper valve member opening and closing, and the bottom of relay piston controls the opening and closing of lower valve assembly.

5. three grades of cadence braking master valves according to claim 4, it is characterized in that: the inner chamber upper end of described relay piston is provided with admission port, the body of rod cavity bottom of dummy piston is provided with exhausr port, and this exhausr port is communicated with the admission port of relay piston upper end; In lower valve inner chamber lower end, sealing shroud is equipped with exhausr port, and this exhausr port center is provided with dust-proof cushion.

6. three grades of cadence braking master valves according to claim 4, is characterized in that: fixing between sliding sleeve and pedal base has dust protecting cap.