CN104192129B - Two grades, the three grades of cadence braking master valves that band slows down - Google Patents
Two grades, the three grades of cadence braking master valves that band slows down Download PDFInfo
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- CN104192129B CN104192129B CN201410485255.1A CN201410485255A CN104192129B CN 104192129 B CN104192129 B CN 104192129B CN 201410485255 A CN201410485255 A CN 201410485255A CN 104192129 B CN104192129 B CN 104192129B
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Abstract
Two grades, the three grades of cadence braking master valves that this band a kind of slows down, the spring bag card of its internal secondary points stops dummy piston and three grades of points are stopped dummy piston assembly, use upper, annular in-flanges, the structure of lower annular flanging, simplify the structure of spring bag card, reduce difficulty of processing and assembly difficulty, it is possible to the significantly qualification rate of improving product.Spring bag card can pass through machining straight forming, it is also possible to carries out one-time formed processing by Sheet Metal Forming Technology, and the course of processing is simple, many that spring installation spring bag card within simultaneously is the simplest.
Description
Technical field
The invention mainly relates to the technical field of the parts of brake valve of car, a kind of band slow down two grades, three
Level cadence braking master valve.
Background technology
The brake system of truck of the prior art and heavy goods vehicles is too anxious, and the bad control of feel easily causes brake
Sheet heats up rapidly, causes carbonization, directly influences braking effect, and it is too urgent to brake, and also can cause sliding inclined, affect stability in the large,
Thus produce insecurity, or unnecessary economic loss.Problem during in order to solve these brakes of truck, our unit is successively
The two-stage cadence braking master valve proposed and the patent of three grades of dummy piston assemblies, it is possible to output " two grades or three grades of points stop "." point
Stop " principle can make compressed air, forms pulse in controlling pipeline and air chamber, is applied to brake block, and every subpulse all phases
When in brake block of instrument wiping.It is not only able to accomplish that brake hubs is combined effectively with brake block, and largely also
Improve brake block carbonization or form adamantine layer, thus avoiding the phenomenon of poor stop to occur, reaching good braking effect.On
Stating the critical component in two patents is spring bag card, and owing to spring bag card shape matching is special, processing technique is complicated, yield rate
The highest, additionally there are the problem that mounting process is complicated, the quality of whole main brake valve is had a great impact.
Summary of the invention
In order to solve the problems referred to above, the present invention proposes two grades, the three grades of cadence braking master valves that a kind of band slows down.
The technical scheme is that the two-stage cadence braking master valve that a kind of band slows down, including being bolted one
The upper valve body risen, middle valve body, lower valve body,
The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step,
In this dummy piston chamber, it is provided with secondary points stop dummy piston assembly, including dummy piston body, spring bag card, top
Pole socket, the top of dummy piston body is columnar width dish 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 dish, and bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, from upper
Down being 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
Indoor, in the width dish chamber that width dish is arranged 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 dish 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；Spring bag card outer cover is propped up equipped with one-level balancing spring, one-level balancing spring
Support is under the lower surface and spring bag card annular of tip-lever support width dish 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 dish 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
Distance between face and width dish lower surface is L4, L1 ＜ L2 ＜ L4；The inside of tip-lever support is provided with push rod chamber,
The top of described dummy piston body is provided with the edge turned up, the lower surface at this edge and the step in 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 of being slidably matched, and the bottom of the outer surface of described dummy piston body is provided with cannelure,
It is provided with sealing ring in this cannelure；Be provided with spacing back-up ring and jump ring in the upper edge of dummy piston chamber, spacing back-up ring gear is flat
The outer edge of the upper end of weighing apparatus piston；
The bottom of described upper valve body is upper valve member cavity, at the outside of upper valve member cavity and upper valve body housing
Between be provided with interlayer, the top of upper interlayer is through with dummy piston chamber, and upper valve member cavity sidepiece 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 hole that inside flange is formed, on this valve hole with under described dummy piston body
The external end head position of the body of rod chamber that portion stretches out is corresponding, and on this, valve bore dia is more than the straight of the external end head of body of rod chamber
Footpath, is provided with valve member in upper valve member inside cavity；
Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, on
For the face of being slidably matched between inwall and the outer wall of upper valve of valve seat, and it is provided with sealing structure；Upper valve seat is pacified by jump ring
It is contained in the lower end of valve member chamber；For being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat
Face, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively at 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, and the upper surface at this sealing gasket is provided with two rings
Shape is protruding, and the annular protrusion in outside cooperatively forms valve opening and closing structure with the edge in valve hole, and the annular protrusion of inner side is with flat
The outer face of the body of rod chamber of weighing apparatus piston lower portion forms valve venting on-off structure；
Middle valve body includes shell and the inner core that upper end is connected, and the interlayer that bottom is uncovered between shell and inner core,
Being provided with relay piston inside the inner core of middle valve body, relay piston includes the vertical hollow rod body at center and is connected to around the body of rod
Stepped piston body, stepped piston body includes upper piston and lower piston, and lower piston is more than upper piston, upper piston
And for the face of being slidably matched between the interior tube inner surface of middle valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston
Room, the sidewall at middle valve body is provided with the slow interface connected with interlayer, and the upper end of the hollow rod body of relay piston is from upper valve
Middle part passes corresponding with the body of rod chamber lower end of dummy piston；
The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, lower piston with should
The inwall of lower piston chamber is the face of being slidably matched；
The bottom of lower valve body is lower valve assembly cavity, sets between the outside of lower valve assembly cavity and lower valve body housing
Having lower interlayer, the top of lower interlayer is through with lower piston chamber, and lower valve assembly cavity sidepiece is provided with level and draws lower valve body
And the lower air inlet that Open Side Down, the sidepiece of lower valve body is additionally provided with level and draws and communicate under Open Side Down with lower interlayer
QI KOU；The lower valve hole that inside flange is formed, this lower valve hole and described servo it is provided with on the top of lower valve assembly cavity
The hollow rod body lower end position of piston is corresponding, and this lower valve bore dia is more than the hollow rod body lower end of relay piston
Diameter, is provided with lower valve assembly in lower valve assembly inside cavity；
Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, under
For the face of being slidably matched between inwall and the outer wall of lower valve of valve seat, and it is provided with sealing structure；The outer wall of lower valve seat with under
For the face of being slidably matched between the inwall of valve member cavity, and it is provided with sealing structure；The upper end of described lower valve is annular disk body,
Inside and outside this annular disk body, form in-flanges and flanging respectively in lower valve end, this flanging lower surface with under
Lower valve spring it is provided with 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 and seals
Pad, the upper surface at this sealing gasket is provided with two annular protrusions, and the annular protrusion in outside cooperatively forms with the edge in lower valve hole
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；
Be provided with exhaust nozzle chamber at lower valve body, and be installed with exhaust nozzle by jump ring, this exhaust nozzle include urceolus and
Inner core, the urceolus 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 of being slidably matched between the inwall of door.
The external diameter of two grades of described balancing springs mates with the internal diameter of spring bag card, the internal diameter of two grades of described balancing springs
Diameter matches with second body of rod；The internal diameter of described one-level balancing spring mates with the external diameter of spring bag card.
Described width dish 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.
Periphery, described tip-lever support upper end is set with the dirt-proof boot of annular, and this dirt-proof boot covers on tip-lever support upper end and upper valve body
Annular region between end.
A kind of band slow down three grades of cadence braking master valves, including the upper valve body being bolted together, middle valve body, under
Valve body,
The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step, is provided with three grades in dummy piston chamber
Put dummy piston assembly of stopping,
These three grades of points are stopped dummy piston assembly, including dummy piston body, spring bag card, tip-lever support,
The top of dummy piston body is columnar width dish 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 dish, and bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, 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
In chamber, in the width dish chamber that width dish is arranged 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 dish 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 dish between flange upper surface；Between spring bag card inwall and the step body of rod
Being provided with balancing spring second, the lower end of balancing spring second is supported on the lower surface of dummy piston body width dish chamber, balancing spring second
The external diameter of upper end less than upper overturning diameter, upper overturning internal diameter is more than or equal to the diameter of first body of rod, the upper end of balancing spring second
Internal diameter less than the diameter of first body of rod；Balancing spring third it is provided with in body of rod chamber,
Balancing spring second upper end is L1 to the distance of the step surface of the first body of rod lower end, 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 the upper end of balancing spring third to the 3rd body of rod lower surface is L2, described
Spring bag card upper surface and width dish lower surface between distance be L4, L1 ＜ L2 ＜ L3 ＜ L4；
The top of described dummy piston body is provided with the edge turned up, the lower surface at this edge and the step in 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 of being slidably matched, and the bottom of the outer surface of described dummy piston body is provided with cannelure,
It is provided with sealing ring in this cannelure；Be provided with spacing back-up ring and jump ring in the upper edge of dummy piston chamber, spacing back-up ring gear is flat
The outer edge of the upper end of weighing apparatus piston；
The bottom of described upper valve body is upper valve member cavity, at the outside of upper valve member cavity and upper valve body housing
Between be provided with interlayer, the top of upper interlayer is through with dummy piston chamber, and upper valve member cavity sidepiece 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 hole that inside flange is formed, on this valve hole with under described dummy piston body
The external end head position of the body of rod chamber that portion stretches out is corresponding, and on this, valve bore dia is more than the straight of the external end head of body of rod chamber
Footpath, is provided with valve member in upper valve member inside cavity；
Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, on
For the face of being slidably matched between inwall and the outer wall of upper valve of valve seat, and it is provided with sealing structure；Upper valve seat is pacified by jump ring
It is contained in the lower end of valve member chamber；For being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat
Face, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively at 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, and the upper surface at this sealing gasket is provided with two rings
Shape is protruding, and the annular protrusion in outside cooperatively forms valve opening and closing structure with the edge in valve hole, and the annular protrusion of inner side is with flat
The outer face of the body of rod chamber of weighing apparatus piston lower portion forms valve venting on-off structure；
Middle valve body includes shell and the inner core that upper end is connected, and the interlayer that bottom is uncovered between shell and inner core,
Being provided with relay piston inside the inner core of middle valve body, relay piston includes the vertical hollow rod body at center and is connected to around the body of rod
Stepped piston body, stepped piston body includes upper piston and lower piston, and lower piston is more than upper piston, upper piston
And for the face of being slidably matched between the interior tube inner surface of middle valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston
Room, the sidewall at middle valve body is provided with the slow interface connected with interlayer, and the upper end of the hollow rod body of relay piston is from upper valve
Middle part passes corresponding with the body of rod chamber lower end of dummy piston；
The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, lower piston with should
The inwall of lower piston chamber is the face of being slidably matched；
The bottom of lower valve body is lower valve assembly cavity, sets between the outside of lower valve assembly cavity and lower valve body housing
Having lower interlayer, the top of lower interlayer is through with lower piston chamber, and lower valve assembly cavity sidepiece is provided with level and draws and opening
Downward lower air inlet, the sidepiece of lower valve body is additionally provided with level and draws and communicate, with lower interlayer, the lower gas outlet that Open Side Down；
The lower valve hole that inside flange is formed, this lower valve hole and described relay piston it is provided with on the top of lower valve assembly cavity
Hollow rod body lower end position is corresponding, and this lower valve bore dia is more than the diameter of the hollow rod body lower end of relay piston,
It is provided with lower valve assembly in lower valve assembly inside cavity；
Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, under
For the face of being slidably matched between inwall and the outer wall of lower valve of valve seat, and it is provided with sealing structure；The outer wall of lower valve seat with under
For the face of being slidably matched between the inwall of valve member cavity, and it is provided with sealing structure；The upper end of described lower valve is annular disk body,
Inside and outside this annular disk body, form in-flanges and flanging respectively in lower valve end, this flanging lower surface with under
Lower valve spring it is provided with 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 and seals
Pad, the upper surface at this sealing gasket is provided with two annular protrusions, and the annular protrusion in outside cooperatively forms with the edge in lower valve hole
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；
Be provided with exhaust nozzle chamber at lower valve body, and be installed with exhaust nozzle by jump ring, this exhaust nozzle include urceolus and
Inner core, the urceolus 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 of being slidably matched between the inwall of door.
The external diameter of described balancing spring second mates with the internal diameter of spring bag card, the internal diameter of described balancing spring second and
The diameter matches of bipole body；The internal diameter of described balancing spring first mates with the external diameter of spring bag card；Described balancing spring third
For rubber spring.
Described width dish 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.
Periphery, described tip-lever support upper end is set with the dirt-proof boot of annular, and this dirt-proof boot covers on tip-lever support upper end and upper valve body
Annular region between end.
The solution have the advantages that:
Two grades, the three grades of cadence braking master valves that this band slows down, its internal secondary points stops dummy piston and three grades of points are stopped flat
The spring bag card of weighing apparatus piston assembly, uses upper, annular in-flanges, the structure of lower annular flanging, simplifies spring bag card
Structure, reduces difficulty of processing and assembly difficulty, it is possible to the significantly qualification rate of improving product.
Spring bag card can pass through machining straight forming, it is also possible to carries out one-time formed adding by Sheet Metal Forming Technology
Work, the course of processing is simple, many that spring installation spring bag card within simultaneously is the simplest.
Accompanying drawing explanation
The cross-sectional view of the two-stage cadence braking master valve that this band of Fig. 1 slows down；
The cross-sectional view of three grades of cadence braking master valves that this band of Fig. 2 slows down；
Fig. 3 is that this secondary points is stopped the main TV structure schematic diagram of dummy piston assembly；
Fig. 4 is that these three grades of points are stopped the main TV structure schematic diagram of dummy piston assembly；
Fig. 5 is the main TV structure schematic diagram of spring bag card；
Fig. 6 is the A-A cross-sectional view of Fig. 5；
Fig. 7 is the main TV structure schematic diagram of tip-lever support；
Fig. 8 is the B-B cross-sectional view of Fig. 7；
1. exhaust nozzles, 2. jump ring in figure, 3.O type circle, 4.O type circle, 5.O type circle, 6. lower valve spring, 7. time
Valve body, 8. bolt, 9. relay piston, 10.O type circle, 11.O type circle, 12. jump rings, 13.O type circle, 14.O type circle,
15.O type circle, valve spring on 16., 17. upper valve bodies, 18.O type circle, 19. back-moving springs, 20. spacing back-up rings, 21. prevent
Dirt set, 22. jump rings, 23.O type circle, 24. lower valve seats, 25. balls are stifled, 26. lower valves, valve body in 27., valve on 28.
Gate seat, 29. dummy pistons, 30. tip-lever supports, 31. one-level balancing springs or balancing spring first, 32. spring bag card, 33. 2
Level balancing spring or balancing spring second, 34. jump rings, 35, the enterprising QI KOU of balancing spring third, 36., gas outlet on 37., enter for 38. times
QI KOU, 39. times gas outlets, 40. slow interfaces；
Wherein 30-1. width dish, 30-2. annular groove, 30-3. first body of rod, 30-4. second body of rod, 30-5. the 3rd bar
Flange under body, 32-1. upper overturning, 32-2..
Detailed description of the invention
Embodiment: see Fig. 1,3, Fig. 5-8, a kind of band slow down two-stage cadence braking master valve, including being bolted
Upper valve body together, middle valve body, lower valve body,
The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step,
In this dummy piston chamber, it is provided with secondary points stop dummy piston assembly, including dummy piston body, spring bag card, top
Pole socket, the top of dummy piston body is columnar width dish 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 dish, and bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, from upper
Down being 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
Indoor, in the width dish chamber that width dish is arranged 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 dish 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；Spring bag card outer cover is propped up equipped with one-level balancing spring, one-level balancing spring
Support is under the lower surface and spring bag card annular of tip-lever support width dish 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 dish 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
Distance between face and width dish lower surface is L4, L1 ＜ L2 ＜ L4；The inside of tip-lever support is provided with push rod chamber,
The top of described dummy piston body is provided with the edge turned up, the lower surface at this edge and the step in 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 of being slidably matched, and the bottom of the outer surface of described dummy piston body is provided with cannelure,
It is provided with sealing ring in this cannelure；Be provided with spacing back-up ring and jump ring in the upper edge of dummy piston chamber, spacing back-up ring gear is flat
The outer edge of the upper end of weighing apparatus piston.
The bottom of described upper valve body is upper valve member cavity, at the outside of upper valve member cavity and upper valve body housing
Between be provided with interlayer, the top of upper interlayer is through with dummy piston chamber, and upper valve member cavity sidepiece 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 hole that inside flange is formed, on this valve hole with under described dummy piston body
The external end head position of the body of rod chamber that portion stretches out is corresponding, and on this, valve bore dia is more than the straight of the external end head of body of rod chamber
Footpath, is provided with valve member in upper valve member inside cavity；
Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, on
For the face of being slidably matched between inwall and the outer wall of upper valve of valve seat, and it is provided with sealing structure；Upper valve seat is pacified by jump ring
It is contained in the lower end of valve member chamber；For being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat
Face, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively at 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, and the upper surface at this sealing gasket is provided with two rings
Shape is protruding, and the annular protrusion in outside cooperatively forms valve opening and closing structure with the edge in valve hole, and the annular protrusion of inner side is with flat
The outer face of the body of rod chamber of weighing apparatus piston lower portion forms valve venting on-off structure；
Middle valve body includes shell and the inner core that upper end is connected, and the interlayer that bottom is uncovered between shell and inner core,
Being provided with relay piston inside the inner core of middle valve body, relay piston includes the vertical hollow rod body at center and is connected to around the body of rod
Stepped piston body, stepped piston body includes upper piston and lower piston, and lower piston is more than upper piston, upper piston
And for the face of being slidably matched between the interior tube inner surface of middle valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston
Room, the sidewall at middle valve body is provided with the slow interface connected with interlayer, and the upper end of the hollow rod body of relay piston is from upper valve
Middle part passes corresponding with the body of rod chamber lower end of dummy piston；
The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, lower piston with should
The inwall of lower piston chamber is the face of being slidably matched；
The bottom of lower valve body is lower valve assembly cavity, sets between the outside of lower valve assembly cavity and lower valve body housing
Having lower interlayer, the top of lower interlayer is through with lower piston chamber, and lower valve assembly cavity sidepiece is provided with level and draws lower valve body
And the lower air inlet that Open Side Down, the sidepiece of lower valve body is additionally provided with level and draws and communicate under Open Side Down with lower interlayer
QI KOU；The lower valve hole that inside flange is formed, this lower valve hole and described servo it is provided with on the top of lower valve assembly cavity
The hollow rod body lower end position of piston is corresponding, and this lower valve bore dia is more than the hollow rod body lower end of relay piston
Diameter, is provided with lower valve assembly in lower valve assembly inside cavity；
Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, under
For the face of being slidably matched between inwall and the outer wall of lower valve of valve seat, and it is provided with sealing structure；The outer wall of lower valve seat with under
For the face of being slidably matched between the inwall of valve member cavity, and it is provided with sealing structure；The upper end of described lower valve is annular disk body,
Inside and outside this annular disk body, form in-flanges and flanging respectively in lower valve end, this flanging lower surface with under
Lower valve spring it is provided with 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 and seals
Pad, the upper surface at this sealing gasket is provided with two annular protrusions, and the annular protrusion in outside cooperatively forms with the edge in lower valve hole
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；
Be provided with exhaust nozzle chamber at lower valve body, and be installed with exhaust nozzle by jump ring, this exhaust nozzle include urceolus and
Inner core, the urceolus 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 of being slidably matched between the inwall of door.
The external diameter of two grades of described balancing springs mates with the internal diameter of spring bag card, the internal diameter of two grades of described balancing springs
Diameter matches with second body of rod；The internal diameter of described one-level balancing spring mates with the external diameter of spring bag card.
Described width dish 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.
Periphery, described tip-lever support upper end is set with the dirt-proof boot of annular, and this dirt-proof boot covers on tip-lever support upper end and upper valve body
Annular region between end.
Work process:
After driver steps on pedal, acting on push rod, tip-lever support is the most descending under push rod effect, first to one-level balancing spring
Effect so that it is compress with the descending of tip-lever support, after its stroke L1 completes, the first body of rod lower surface of tip-lever support and 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 installed rear stage put down more than the rigidity of two grades of balancing springs, this dummy piston assembly
The lower flange of spring bag card is pressed onto the lower surface of width dish chamber by weighing apparatus spring；So first act on one-level to put down when tip-lever support is descending
Weighing apparatus spring, simultaneously acts on firsts and seconds balancing spring after the stroke of L1 completes again, and it acts on two springs side by side, thus
Form twice buffering.
Another situation is exactly that the spring selecting length just to mate with spring bag card internal height is as two grades of balances
Spring, thus need not limit the rigidity of two grades of balancing springs, also can realize secondary buffer.
Embodiment two: see Fig. 2,4, Fig. 5-8, three grades of cadence braking master valves that a kind of band slows down, including by bolt even
The upper valve body being connected together, middle valve body, lower valve body,
The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step, is provided with three grades in dummy piston chamber
Put dummy piston assembly of stopping,
These three grades of points are stopped dummy piston assembly, including dummy piston body, spring bag card, tip-lever support,
The top of dummy piston body is columnar width dish 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 dish, and bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, 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
In chamber, in the width dish chamber that width dish is arranged 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 dish 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 dish between flange upper surface；Between spring bag card inwall and the step body of rod
Being provided with balancing spring second, the lower end of balancing spring second is supported on the lower surface of dummy piston body width dish chamber, balancing spring second
The external diameter of upper end less than upper overturning diameter, upper overturning internal diameter is more than or equal to the diameter of first body of rod, the upper end of balancing spring second
Internal diameter less than the diameter of first body of rod；Balancing spring third it is provided with in body of rod chamber,
Balancing spring second upper end is L1 to the distance of the step surface of the first body of rod lower end, 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 the upper end of balancing spring third to the 3rd body of rod lower surface is L2, described
Spring bag card upper surface and width dish lower surface between distance be L4, L1 ＜ L2 ＜ L3 ＜ L4；
The top of described dummy piston body is provided with the edge turned up, the lower surface at this edge and the step in 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 of being slidably matched, and the bottom of the outer surface of described dummy piston body is provided with cannelure,
It is provided with sealing ring in this cannelure；Be provided with spacing back-up ring and jump ring in the upper edge of dummy piston chamber, spacing back-up ring gear is flat
The outer edge of the upper end of weighing apparatus piston.
The bottom of described upper valve body is upper valve member cavity, at the outside of upper valve member cavity and upper valve body housing
Between be provided with interlayer, the top of upper interlayer is through with dummy piston chamber, and upper valve member cavity sidepiece 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 hole that inside flange is formed, on this valve hole with under described dummy piston body
The external end head position of the body of rod chamber that portion stretches out is corresponding, and on this, valve bore dia is more than the straight of the external end head of body of rod chamber
Footpath, is provided with valve member in upper valve member inside cavity；
Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, on
For the face of being slidably matched between inwall and the outer wall of upper valve of valve seat, and it is provided with sealing structure；Upper valve seat is pacified by jump ring
It is contained in the lower end of valve member chamber；For being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat
Face, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, respectively at 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, and the upper surface at this sealing gasket is provided with two rings
Shape is protruding, and the annular protrusion in outside cooperatively forms valve opening and closing structure with the edge in valve hole, and the annular protrusion of inner side is with flat
The outer face of the body of rod chamber of weighing apparatus piston lower portion forms valve venting on-off structure；
Middle valve body includes shell and the inner core that upper end is connected, and the interlayer that bottom is uncovered between shell and inner core,
Being provided with relay piston inside the inner core of middle valve body, relay piston includes the vertical hollow rod body at center and is connected to around the body of rod
Stepped piston body, stepped piston body includes upper piston and lower piston, and lower piston is more than upper piston, upper piston
And for the face of being slidably matched between the interior tube inner surface of middle valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston
Room, the sidewall at middle valve body is provided with the slow interface connected with interlayer, and the upper end of the hollow rod body of relay piston is from upper valve
Middle part passes corresponding with the body of rod chamber lower end of dummy piston；
The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, lower piston with should
The inwall of lower piston chamber is the face of being slidably matched；
The bottom of lower valve body is lower valve assembly cavity, sets between the outside of lower valve assembly cavity and lower valve body housing
Having lower interlayer, the top of lower interlayer is through with lower piston chamber, and lower valve assembly cavity sidepiece is provided with level and draws and opening
Downward lower air inlet, the sidepiece of lower valve body is additionally provided with level and draws and communicate, with lower interlayer, the lower gas outlet that Open Side Down；
The lower valve hole that inside flange is formed, this lower valve hole and described relay piston it is provided with on the top of lower valve assembly cavity
Hollow rod body lower end position is corresponding, and this lower valve bore dia is more than the diameter of the hollow rod body lower end of relay piston,
It is provided with lower valve assembly in lower valve assembly inside cavity；
Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, under
For the face of being slidably matched between inwall and the outer wall of lower valve of valve seat, and it is provided with sealing structure；The outer wall of lower valve seat with under
For the face of being slidably matched between the inwall of valve member cavity, and it is provided with sealing structure；The upper end of described lower valve is annular disk body,
Inside and outside this annular disk body, form in-flanges and flanging respectively in lower valve end, this flanging lower surface with under
Lower valve spring it is provided with 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 and seals
Pad, the upper surface at this sealing gasket is provided with two annular protrusions, and the annular protrusion in outside cooperatively forms with the edge in lower valve hole
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；
Be provided with exhaust nozzle chamber at lower valve body, and be installed with exhaust nozzle by jump ring, this exhaust nozzle include urceolus and
Inner core, the urceolus 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 of being slidably matched between the inwall of door.
The external diameter of described balancing spring second mates with the internal diameter of spring bag card, the internal diameter of described balancing spring second and
The diameter matches of bipole body；The internal diameter of described balancing spring first mates with the external diameter of spring bag card；Described balancing spring third
For rubber spring.
Described width dish 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.
Periphery, described tip-lever support upper end is set with the dirt-proof boot of annular, and this dirt-proof boot covers on tip-lever support upper end and upper valve body
Annular region between end.
Work process:
After driver steps on pedal, acting on push rod, tip-lever support is the most descending under push rod effect, first makees balancing spring first
With so that it is compress with the descending of tip-lever support, after its stroke L1 completes, the 3rd body of rod lower end and balancing spring of tip-lever support
Third contact, now balancing spring third and balancing spring first act on jointly, after its L2 stroke completes, 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 dish chamber；So first act on balancing spring first when tip-lever support is descending, treat L2's
Stroke simultaneously act on again after completing balancing spring first, second, third, its effects side by side of three springs.
Another situation is exactly that the spring selecting length just to mate with spring bag card internal height is as balancing spring
Second, thus need not limit the rigidity of balancing spring second.
Claims (8)
1. the two-stage cadence braking master valve that band slows down, including the upper valve body being bolted together, middle valve body, lower valve
Body,
The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step,
In this dummy piston chamber, it is provided with secondary points stop dummy piston assembly, including dummy piston body, spring bag card, push rod
Seat, the top of dummy piston body is columnar width dish 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 dish, and bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, 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
In, in the width dish chamber that width dish is arranged in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, is positioned at
Between the step body of rod and the inwall of dummy piston body width dish chamber of tip-lever support, the upper end of spring bag card is provided with in 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 and spring bag card annular of tip-lever support width dish between flange upper surface；Between spring bag card inwall and the step body of rod
Being 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 dish chamber, puts 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 first body of rod lower end step surface away from
From for L1, 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 surface of described spring bag card
And the distance between width dish lower surface is L4, L1 ＜ L2 ＜ L4；The inside of tip-lever support is provided with push rod chamber,
The top of described dummy piston body is provided with the edge turned 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 of being slidably matched, and the bottom of the outer surface of described dummy piston body is provided with cannelure, this ring
It is provided with sealing ring in shape groove；Be provided with spacing back-up ring and jump ring in the upper edge of dummy piston chamber, spacing back-up ring gear is lived in balance
The outer edge of the upper end of plug；
The bottom of described upper valve body is upper valve member cavity, between the outside and upper valve body housing of upper valve member cavity
Being provided with interlayer, the top of upper interlayer is through with dummy piston chamber, and upper valve member cavity sidepiece is provided with and protrudes horizontally up valve
The enterprising QI KOU of body housing, the sidepiece of upper valve body is additionally provided with the upper gas outlet protruding horizontally up and communicating with upper interlayer；At upper valve
The top of assembly cavity is provided with the upper valve hole that inside flange is formed, and on this, valve hole is stretched with the bottom of described dummy piston body
The external end head position of the body of rod chamber gone out is corresponding, and on this, valve bore dia is more than the diameter of the external end head of body of rod chamber,
Upper valve member inside cavity is provided with valve member；
Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, upper valve
For the face of being slidably matched between inwall and the outer wall of upper valve of seat, and it is provided with sealing structure；Upper valve seat is arranged on by jump ring
The lower end of upper valve member chamber；For the face of being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat, 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, and the upper surface at this sealing gasket is provided with two convex annular
Rising, the annular protrusion in outside cooperatively forms valve opening and closing 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；
Middle valve body includes shell and inner core, and the interlayer that bottom is uncovered between shell and inner core, the middle valve that upper end is connected
Relay piston it is provided with, vertical hollow rod body that relay piston includes center and the step being connected to around the body of rod inside the inner core of body
Shape piston body, stepped piston body includes upper piston and lower piston, lower piston be more than upper piston, upper piston with in
For the face of being slidably matched between the interior tube inner surface of valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston,
The sidewall of middle valve body is provided with the slow interface connected with interlayer, and the upper end of the hollow rod body of relay piston is worn from the middle part of upper valve
Go out corresponding with the body of rod chamber lower end of dummy piston；
The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, lower piston and this bottom
The inwall of piston chamber is the face of being slidably matched；
The bottom of lower valve body is lower valve assembly cavity, under being provided with between the outside of lower valve assembly cavity and lower valve body housing
Interlayer, the top of lower interlayer is through with lower piston chamber, and lower valve assembly cavity sidepiece is provided with level and draws lower valve body and open
Mouthful downward lower air inlet, the sidepiece of lower valve body is additionally provided with level and draws and communicate under Open Side Down with lower interlayer and give vent to anger
Mouthful；Being provided with the lower valve hole that inside flange is formed on the top of lower valve assembly cavity, lives with described servo in this lower valve hole
The hollow rod body lower end position of plug is corresponding, and straight more than the hollow rod body lower end of relay piston of this lower valve bore dia
Footpath, is provided with lower valve assembly in lower valve assembly inside cavity；
Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, lower valve
For the face of being slidably matched between inwall and the outer wall of lower valve of seat, and it is provided with sealing structure；The outer wall of lower valve seat and lower valve
For the face of being slidably matched between the inwall of assembly cavity, and it is provided with sealing structure；The upper end of described lower valve is annular disk body, at this
In-flanges and flanging is formed respectively in lower valve end, at 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 sealing gasket,
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 in lower valve hole
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；
Being provided with exhaust nozzle chamber at lower valve body, and be installed with exhaust nozzle by jump ring, this exhaust nozzle includes urceolus and inner core,
The urceolus 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 of being slidably matched between inwall.
The two-stage cadence braking master valve that band the most according to claim 1 slows down, is characterized in that: two grades of described balancing springs
External diameter mate with the internal diameter of spring bag card, the internal diameter of two grades of described balancing springs and the diameter matches of second body of rod；Described
The internal diameter of one-level balancing spring mate with the external diameter of spring bag card.
The two-stage cadence braking master valve that band the most according to claim 1 slows down, is characterized in that: described width dish lower surface exists
It is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card.
The two-stage cadence braking master valve that band the most according to claim 1 slows down, is characterized in that: described tip-lever support upper end is peripheral
Being set with the dirt-proof boot of annular, this dirt-proof boot covers the annular region between tip-lever support upper end and upper valve body upper end.
5. three grades of cadence braking master valves that band slows down, including the upper valve body being bolted together, middle valve body, lower valve
Body,
The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step, is provided with three grades of points and stops in dummy piston chamber
Dummy piston assembly,
These three grades of points are stopped dummy piston assembly, including dummy piston body, spring bag card, tip-lever support,
The top of dummy piston body is columnar width dish 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 dish, and bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, 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
In, in the width dish chamber that width dish is arranged in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, is positioned at
Between the step body of rod and the inwall of dummy piston body width dish chamber of tip-lever support, the upper end of spring bag card is provided with in inside annular
Flange, lower end is provided with flange under outside annular；Spring bag card outer cover is supported on top equipped with balancing spring first, balancing spring first
Under the lower surface of pole socket width dish and spring bag card arc between flange upper surface；It is provided with 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 dish chamber, balancing spring second upper
The external diameter of end less than upper overturning diameter, upper overturning internal diameter more than or equal to the diameter of first body of rod, the upper end of balancing spring second interior
Footpath is less than the diameter of first body of rod；Balancing spring third it is provided with in body of rod chamber,
Balancing spring second upper end is L1 to the distance of the step surface of the first body of rod lower end, 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 the upper end of balancing spring third to the 3rd body of rod lower surface is L2, described bullet
Distance between upper surface and the width dish lower surface of spring bag card is L4, L1 ＜ L2 ＜ L3 ＜ L4；
The top of described dummy piston body is provided with the edge turned 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 of being slidably matched, and the bottom of the outer surface of described dummy piston body is provided with cannelure, this ring
It is provided with sealing ring in shape groove；Be provided with spacing back-up ring and jump ring in the upper edge of dummy piston chamber, spacing back-up ring gear is lived in balance
The outer edge of the upper end of plug；
The bottom of described upper valve body is upper valve member cavity, between the outside and upper valve body housing of upper valve member cavity
Being provided with interlayer, the top of upper interlayer is through with dummy piston chamber, and upper valve member cavity sidepiece is provided with and protrudes horizontally up valve
The enterprising QI KOU of body housing, the sidepiece of upper valve body is additionally provided with the upper gas outlet protruding horizontally up and communicating with upper interlayer；At upper valve
The top of assembly cavity is provided with the upper valve hole that inside flange is formed, and on this, valve hole is stretched with the bottom of described dummy piston body
The external end head position of the body of rod chamber gone out is corresponding, and on this, valve bore dia is more than the diameter of the external end head of body of rod chamber,
Upper valve member inside cavity is provided with valve member；
Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, upper valve
For the face of being slidably matched between inwall and the outer wall of upper valve of seat, and it is provided with sealing structure；Upper valve seat is arranged on by jump ring
The lower end of upper valve member chamber；For the face of being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat, 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, and the upper surface at this sealing gasket is provided with two convex annular
Rising, the annular protrusion in outside cooperatively forms valve opening and closing 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；
Middle valve body includes shell and inner core, and the interlayer that bottom is uncovered between shell and inner core, the middle valve that upper end is connected
Relay piston it is provided with, vertical hollow rod body that relay piston includes center and the step being connected to around the body of rod inside the inner core of body
Shape piston body, stepped piston body includes upper piston and lower piston, lower piston be more than upper piston, upper piston with in
For the face of being slidably matched between the interior tube inner surface of valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston,
The sidewall of middle valve body is provided with the slow interface connected with interlayer, and the upper end of the hollow rod body of relay piston is worn from the middle part of upper valve
Go out corresponding with the body of rod chamber lower end of dummy piston；
The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, lower piston and this bottom
The inwall of piston chamber is the face of being slidably matched；
The bottom of lower valve body is lower valve assembly cavity, under being provided with between the outside of lower valve assembly cavity and lower valve body housing
Interlayer, the top of lower interlayer is through with lower piston chamber, and lower valve assembly cavity sidepiece is provided with level extraction and Open Side Down
Lower air inlet, the sidepiece of lower valve body be additionally provided with level draw and communicate, with lower interlayer, the lower gas outlet that Open Side Down；Under
The top of valve member cavity is provided with the lower valve hole that inside flange is formed, and this lower valve hole is hollow with described relay piston
Body of rod lower end position is corresponding, and this lower valve bore dia is more than the diameter of the hollow rod body lower end of relay piston, under
Valve member inside cavity is provided with lower valve assembly；
Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, lower valve
For the face of being slidably matched between inwall and the outer wall of lower valve of seat, and it is provided with sealing structure；The outer wall of lower valve seat and lower valve
For the face of being slidably matched between the inwall of assembly cavity, and it is provided with sealing structure；The upper end of described lower valve is annular disk body, at this
In-flanges and flanging is formed respectively in lower valve end, at 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 sealing gasket,
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 in lower valve hole
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；
Being provided with exhaust nozzle chamber at lower valve body, and be installed with exhaust nozzle by jump ring, this exhaust nozzle includes urceolus and inner core,
The urceolus 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 of being slidably matched between inwall.
Three grades of cadence braking master valves that band the most according to claim 5 slows down, is characterized in that: described balancing spring second
External diameter mates with the internal diameter of spring bag card, the internal diameter of described balancing spring second and the diameter matches of second body of rod；Described is flat
The internal diameter of Heng Danhuangjia mates with the external diameter of spring bag card；Described balancing spring third is rubber spring.
Three grades of cadence braking master valves that band the most according to claim 5 slows down, is characterized in that: described width dish lower surface exists
It is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card.
Three grades of cadence braking master valves that band the most according to claim 5 slows down, is characterized in that: described tip-lever support upper end is peripheral
Being set with the dirt-proof boot of annular, this dirt-proof boot covers the annular region between tip-lever support upper end and upper valve body upper end.
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| US5947446A (en) * | 1997-09-26 | 1999-09-07 | New York Air Brake Corporation | Control valve bushing with anodized aluminum surface with teflon |
| US6276137B1 (en) * | 2000-01-14 | 2001-08-21 | Delphi Technologies, Inc. | Brake master cylinder with dual check valve compensation through secondary piston |
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| Publication number | Publication date |
|---|---|
| CN104192129A (en) | 2014-12-10 |
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