CN205149846U

CN205149846U - Relay valve with anti -lock function and braking are steady

Info

Publication number: CN205149846U
Application number: CN201521023867.5U
Authority: CN
Inventors: 李伟; 李飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-11
Filing date: 2015-12-11
Publication date: 2016-04-13
Anticipated expiration: 2025-12-11

Abstract

The utility model discloses a relay valve with anti -lock function and braking are steady, including the valve body, be equipped with the drive chamber, the piston that communicate in proper order slide hole, piston chamber, exhaust chamber, intercommunicating pore and the chamber of admitting air in the valve body, the piston slides, and sliding connection has the piston rod in the hole, is equipped with last diaphragm, time diaphragm and piston that driving a piston rod moved down in the valve body, the intracavity that admits air is equipped with the shrouding with piston rod linkage and shutoff intercommunicating pore, the main drive inlet port, the intercommunication that still are provided with required power gas when providing the piston rod and moving down on the valve body exhaust the down braking exhaust hole in chamber of first braking inlet port and the intercommunication in chamber of admitting air, still be equipped with on the valve body and prevent that the piston rod from moving down the two -stage anti -lock device that opening when leading to opening the shrouding in the twinkling of an eye is too big, lead to the tire locking at the excessive speed. The utility model discloses the speed when but the shrouding is opened to the precise adjustment piston rod to avoid the tire locking, and can the trim control shrouding open the size, have better brake stability.

Description

There is anti-lock function and braking pulsation-free relay valve

Technical field

The utility model relates to a kind of relay valve.

Background technology

Relay valve belongs to a part for automobile air brake brake system, especially in the brake system of Duo Qiao road load-carrying trailer, relay valve works the reaction time and the pressure setting time that shorten the corresponding braking in multiple bridge roads, thus realizes the brake cylinder in the multiple bridge road of synchro control, wherein, relay valve is provided with the braking induction opening being communicated with air receiver, be communicated with the braking air gate of corresponding brake cylinder and be communicated with the driving admission port of brake activation valve, be provided with in relay valve to open and close and be communicated with braking induction opening and the valve braking air gate, also slidably connecting in relay valve can the piston rod of Open valve, when stepping on brake pedal, the output pressure of brake activation valve to input to the plunger shaft of relay valve as the control presssure of relay valve from driving admission port and promotes piston rod and pushed open by the valve port of valve, so pressurized air just passes through braking induction opening by air receiver, valve port and the braking air gate of valve enter corresponding brake cylinder, thus realize the braking maneuver of tire, but current relay valve, of a great variety, technology is still immature, the problem of two aspects below ubiquity: 1, when load-carrying trailer is in zero load or light condition, because load-carrying trailer total quality is light, when stepping on brake pedal, the valve port of valve is opened size and is difficult to accurate control, the pressurized air exporting brake cylinder from valve port to can be caused when valve port is opened excessive too much, cause the unexpected locking of tire, cause problem that is bad and wear on tyres of slowing down, 2, when load-carrying trailer is in fully loaded or overload condition, now step on brake pedal, tire will strive for locking state, now, the pressurized air exporting brake cylinder to can form the high pressure gas of moment due to the antagonistic force of brake cylinder and recoil back in the inner chamber of relay valve, thus piston rod recoil will be promoted to return state, the valve port of valve is caused to close, cause the tire in braking procedure to be frequently in and rotate freely and locking two kinds of mode of operations, car body is caused to rock, be difficult to steady brake, drive the problems such as not easy to operate.

Utility model content

The technical problems to be solved in the utility model is to provide one and has anti-lock function and braking pulsation-free relay valve.

For solving the problems of the technologies described above, the utility model comprises valve body, its constructional feature is: be provided with the actuator chamber be communicated with successively in described valve body from top to bottom, piston slip hole, plunger shaft, discharge chamber, intercommunicating pore and inlet chamber, in piston slip hole, slipper seal is connected with upper end and stretches in actuator chamber, the piston rod in inlet chamber can be stretched in lower end, upper diaphragm actuator chamber being divided into upper actuator chamber and lower actuator chamber is provided with in valve body, discharge chamber is divided into the lower diaphragm of upper discharge chamber and lower discharge chamber, upper diaphragm and lower diaphragm and piston rod affixed, connection piston is on the piston rod provided with in described plunger shaft, valve body is provided with the braking deflation hole of the main driving induction opening being communicated with above actuator chamber, plunger shaft and upper discharge chamber, the first braking induction opening being communicated with inlet chamber and the lower discharge chamber of connection, be provided with in inlet chamber and link with piston rod and the shrouding of shutoff intercommunicating pore and oppress the retracing spring that shrouding is in sealed condition, the sidepiece of described valve body is also provided with the uncovered pressure regulating cavity in the upper end that is communicated with successively, the air extractor vent be communicated with lower actuator chamber and the tonifying Qi chamber be communicated with lower discharge chamber from top to bottom, be provided with in tonifying Qi chamber and the primary seal of shutoff air extractor vent can block up and oppress primary seal and block up the main power spring being in sealed condition, voltage regulation diaphragm pressure regulating cavity being divided into upper pressure regulating cavity and lower pressure regulating cavity is also sealedly connected with in described pressure regulating cavity, voltage regulation diaphragm is connected with pressure regulating cavity is stretched in upper end, tonifying Qi chamber can lean the hollow valve rod blocked in primary seal is stretched into through air extractor vent in lower end, described hollow valve rod is provided with axial pass-through holes, and valve body is provided with the regulator regulating coreless valve masthead power.

After adopting said structure, when stepping on brake pedal and braking, the output pressure of brake activation valve enters upper actuator chamber as the control presssure of relay valve from main driving induction opening, in plunger shaft and upper discharge chamber, thus promote the downward slippage of piston rod and open shrouding discharge chamber is communicated with inlet chamber, pressurized air now in storage tank brakes induction opening through inlet chamber from first, lower discharge chamber and braking deflation hole enter the brake cylinder on corresponding bridge road, thus realize tire braking, simultaneously, owing to being full of the larger pressurized air of pressure in lower discharge chamber, therefore, primary seal in tonifying Qi chamber block up the pressure of air by compression and the top power of main power spring thus lean and shutoff on air extractor vent, in addition, while the downward slippage of piston rod, air in lower actuator chamber suffers oppression thus enters in lower pressure regulating cavity through air extractor vent, and promote voltage regulation diaphragm and heave as elasticity thus promote hollow valve rod and move up, once the lower surface of hollow valve rod and primary seal are blocked up form Separation, then descend the air in actuator chamber will enter upper pressure regulating cavity from this gap through hollow stem cavity, and finally enter air, this structure effectively can control the discharge velocity of lower driving chamber air, thus slow down piston rod move down speed, avoid piston rod to move down suddenly and cause shrouding unlatching excessive, cause pressurized air to discharge and excessively cause tire locking, when end of braking, piston rod promotes shrouding and piston rod move reset due to the antagonistic force of retracing spring, this pressure at present in discharge chamber reduces, the downward slippage of top power of the modulated pressure device of hollow valve rod, its lower end again leans to block in primary seal and continue to lean primary seal and blocks up the top power overcoming main power spring and move down, thus by stifled for primary seal top from air extractor vent, now, tonifying Qi chamber is communicated with air extractor vent and air in upper discharge chamber supplements in lower actuator chamber again, for braking is prepared next time, the effect of regulator is the top power regulating hollow valve rod downward, thus the air controlled in lower actuator chamber backs down hollow valve rod after reaching suitable air pressure loses heart, can controlling coreless valve masthead in addition after end of braking, to open primary seal stifled thus be communicated with in discharge chamber and lower actuator chamber, powered piston rod is provided to move down owing to adopting upper these three chambers of actuator chamber, plunger shaft and upper discharge chamber between piston rod and valve body, stability when therefore increasing the propelling thrust of piston rod and open shrouding, when avoiding the pressurized air transient pressure in lower discharge chamber excessive, anti-push piston bar upwards resets, cause shrouding again to be closed, thus brake when occurring that tire occurs, time and the state of not braking.

Described regulator comprises screwing tight and revolves seat and spiral shell is contained in the hollow pressure regulation nut revolving an outer end pressure regulating cavity upper shed place hollow, hollow revolving in an inner chamber is provided with upper end and leans and pass pressure regulating cavity at pressure regulation nut upper and lower end and lean the pressure spring on hollow valve rod, and described pressure regulation nut is provided with bleeder port.

There is spin to prevent pressure regulation nut to loosen, described pressure regulation nut is screwed with hold out against hollow revolve seat hold out against screw.

Hold out against screw to prevent from arbitrarily turning and prevent sand and dust from entering in bleeder port, described pressure regulation nut is provided with the protective cover covering and hold out against screw and bleeder port.

Tire locking is caused in order to avoid piston rod fast open unpacking plate further, the end mouth of described inlet chamber is opened on the bottom surface of valve body, the diameter of described intercommunicating pore is less than inlet chamber diameter, in described inlet chamber, slipper seal is connected with hollow piston cover, the roof of hollow piston cover is provided with the deflation hole being communicated with its inner chamber and intercommunicating pore, described shrouding be positioned at hollow piston cover and shutoff on deflation hole, the sealed bottom of described hollow piston cover is connected with base plate, described base plate top is provided with orienting sleeve, in orienting sleeve, slipper seal is connected with guide pillar, the upper end of guide pillar is provided with the disk connecting shrouding, base plate is provided with the main ventilation orifice being communicated with orienting sleeve inner chamber and base plate underlying space, described retracing spring is sleeved on outside orienting sleeve and guide pillar and its upper end and leans on disk bottom surface, lower end leans on plate top surface, the internal orifice of described first braking induction opening extends on chamber, the side wall in the stage casing of inlet chamber, described hollow piston cover sidewall is provided with and is communicated with the air channel that its inner chamber and first brakes the internal orifice of induction opening, the bottom of described valve body is provided with spring perch, being provided with upper end between spring perch and hollow piston overlap leans on hollow piston overlaps, lower end leans the recoil spring on spring perch, described spring perch is provided with secondary ventilation orifice.

The top of described hollow piston cover is provided with the ring sleeve stretched in intercommunicating pore, the outer peripheral face of described ring sleeve contacts with the inner peripheral surface slipper seal of intercommunicating pore, the end face of described inlet chamber and hollow piston overlap between top and are provided with annular compartment, the sidepiece of described valve body is provided with the pair being communicated with annular compartment and drives induction opening, the bottom of described valve body is provided with the second braking induction opening, described second braking induction opening is communicated with air channel, the top of described second braking induction opening is provided with and is communicated with the secondary breather hole driving induction opening, be provided with the secondary seal plug of shutoff breather hole in described second braking induction opening and oppress the secondary power spring that secondary seal plug is in sealed condition.

Described spring perch is provided with the resilient dust pad covering secondary ventilation orifice.

Described shrouding is that elastomeric material is made.

In sum, the utility model structure is simple, easy to use, can the speed of accurate adjustment piston rod when opening shrouding, thus avoids tire locking, and steadily can control the unlatching size of shrouding, has stability of braking preferably.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:

Fig. 1 is that master of the present utility model looks sectional structure schematic diagram;

Fig. 2 is that sectional structure schematic diagram is looked on a left side of the present utility model;

Fig. 3 is that the master of the utility model when being in braking operation looks sectional structure schematic diagram.

Detailed description of the invention

With reference to accompanying drawing, this has anti-lock function and braking pulsation-free relay valve comprises valve body, the actuator chamber, piston slip hole 1, plunger shaft 2, discharge chamber, intercommunicating pore 35 and the inlet chamber 16 that are communicated with successively is provided with from top to bottom in valve body, conveniently manufacture, this valve body comprises the upper shell 3, upper valve body 4 and lower valve body 5 three part that are installed together successively from top to bottom: wherein, actuator chamber 6 is offered in the bottom of upper shell 3, accordingly, offer lower actuator chamber 7 in the top correspondence of upper valve body 4, on this, actuator chamber 6 and lower actuator chamber 7 form the actuator chamber of a sealing; Secondly, bottom upper valve body 4, offer discharge chamber 9, accordingly, at lower valve body 5 top, correspondence offers lower discharge chamber 10, and on this, discharge chamber 9 and lower discharge chamber 10 form the discharge chamber of a sealing; Thirdly, this piston slip hole 1 and plunger shaft 2 are opened in the upper valve body 4 between discharge chamber 9 and lower actuator chamber 7, the diameter of plunger shaft 2 is greater than the diameter of piston slip hole 1, the upper shed of piston slip hole 1 is directly communicated with bottom lower actuator chamber 7, its under shed is directly communicated with plunger shaft 2 top, and the under shed of plunger shaft 2 is directly communicated with the top of upper discharge chamber 9; Finally, inlet chamber 16 is arranged on bottom lower valve body 5, its under shed be positioned on lower valve body 5 bottom surface passes through welding plugging plate or connects closeouts by its shutoff, lower valve body 5 wall body between inlet chamber 16 with lower discharge chamber 10 is provided with the intercommunicating pore 35 both being communicated with, the diameter of intercommunicating pore 35 is less than the diameter of inlet chamber 16, wherein, the retracing spring 19 that the shrouding 18 of shutoff on intercommunicating pore 35 and compressing shrouding 18 are in sealed condition is also provided with in inlet chamber 16.

Continue with reference to accompanying drawing, in piston slip hole 1, slipper seal is connected with upper end and stretches in actuator chamber, lower end to be stretched in intercommunicating pore 35 and the piston rod 12 leaned on shrouding 18 end face, this slipper seal connection structure is that piston rod 12 both slided up and down in piston slip hole 1, and the outer peripheral face of piston rod 12 also seals with the inner peripheral surface of piston slip hole 1 and contacts, certainly in order to realize this structure can in piston slip hole 1 mounting O-shaped seal ring, in addition, piston rod 12 and shrouding 18 are split part, when therefore not working, the lower surface of this piston rod 12 only contacts with shrouding 18 end face, during work, piston rod 12 can withstand shrouding 12 and be opened, continue with reference to accompanying drawing, the upper diaphragm 8 of separation is provided with between upper actuator chamber 6 and lower actuator chamber 7, upper shell 3 to be arranged on upper valve body 4 end face by screw and by upper diaphragm 8 sealed clamping between, this upper diaphragm 8 is clamped in piston rod 12 upper end by nut, be provided with the lower diaphragm 11 of both separations in upper and lower discharge chamber, when lower valve body 5 is arranged on upper valve body 4 bottom surface by screw by lower diaphragm 11 sealed clamping between, this lower diaphragm 11 is clamped in piston rod 12 bottom by nut, accordingly, the piston 13 be connected on piston rod 12 is provided with in plunger shaft 2.Power gas required when moving down to provide piston rod, the sidepiece of upper shell 3 offers the main driving induction opening 14 being communicated with upper actuator chamber 6, accordingly, upper valve body is offered interface channel by plunger shaft 2, on discharge chamber 9 be communicated with upper actuator chamber 6 respectively; The braking deflation hole 15 of discharge chamber 10 under the upper end sidepiece of lower valve body also offers connection, offers the first braking induction opening 17 being communicated with inlet chamber 16 at the lower end sidepiece of lower valve body 5.Therefore, when stepping on brake pedal and braking, the output pressure of brake activation valve enters upper actuator chamber 6, plunger shaft 2 and upper discharge chamber 9 as the control presssure of relay valve from main driving induction opening 14, thus promote piston rod 12 slippage downwards and open shrouding 18 lower discharge chamber is communicated with inlet chamber 16, pressurized air now in storage tank enters the brake cylinder on corresponding bridge road through inlet chamber 16, lower discharge chamber 10 and braking deflation hole 15 from the first braking induction opening 17, thus realize tire braking; In order to realize trailer Duo Qiao road synchronous braking, therefore brake deflation hole 15 and can offer multiple on lower valve body, such as, when trailer axle Lu Weisan bridge road, because each bridge road is with two brake pumps, therefore this braking deflation hole can be set to 6; Certainly in order to provide enough pressurized airs to brake pump, therefore the braking induction opening be arranged on lower valve body 5 also can for multiple, and its called after first is braked induction opening, the second braking induction opening etc., above-mentioned braking induction opening passes through pipeline connection with corresponding storage tank respectively.

In order to prevent when stepping on brake pedal, too fast the moving down of piston rod 12 causes opening when opening shrouding 18 instantaneously excessive, and cause pressurized air to discharge instantaneously and excessively cause tire locking, the relay valve of said structure also add two-stage anti-lock device in its structure:

Pressure regulating cavity is offered at the top that first order anti-lock device is included in upper valve body 4 side, continue to offer the air extractor vent 20 that diameter is less than pressure regulating cavity diameter in the bottom of pressure regulating cavity, continue to offer the tonifying Qi chamber 21 that diameter is greater than air extractor vent 20 diameter in the bottom of air extractor vent 20, tonifying Qi chamber 21 is communicated with lower discharge chamber 10, in addition, air extractor vent 20 is communicated with lower actuator chamber 7, be placed with elastomeric primary seal in tonifying Qi chamber 21 and block up 22 and primary seal is blocked up 22 maintenances and lean the main power spring 23 on the end face of tonifying Qi chamber 21, this primary seal is blocked up 22 and the air extractor vent 20 being communicated with tonifying Qi chamber 21 can be blocked, the chamber wall of pressure regulating cavity is tightly connected and pressure regulating cavity is divided into the voltage regulation diaphragm 26 of upper pressure regulating cavity 24 and lower pressure regulating cavity 25, voltage regulation diaphragm 26 is connected with upper end to stretch into pressure regulating cavity 24, lower end and stretch into tonifying Qi chamber 21 through air extractor vent 20 and can lean the hollow valve rod 27 blocked up in primary seal on 22, hollow valve rod 27 is provided with axial pass-through holes, upper shed place of pressure regulating cavity has screwed tight hollowly revolves seat 28, hollow outer end of revolving seat 28 is provided with outer adjustment thread segment, outer adjustment thread segment is screwed with pressure regulation nut 29, accordingly, the internal perisporium of pressure regulation nut 29 is also provided with interior adjustment thread segment, conveniently turn pressure regulation nut, the top of pressure regulation nut is provided with the main holding part 32 of convenient wrench clamping, there is spin to prevent pressure regulation nut 29 to loosen, pressure regulation nut 29 is screwed with hold out against hollow revolve seat 28 hold out against screw 30, in addition, the air conveniently gone up in pressure regulating cavity is in communication with the outside, the roof of pressure regulation nut is offered bleeder port 31, hold out against screw 30 to prevent from arbitrarily turning and prevent sand and dust from entering in bleeder port 31, pressure regulation nut 29 is provided with the protective cover 33 covering and hold out against screw 30 and bleeder port 31, in addition, hollow revolving in seat 28 inner chamber is provided with upper end and leans on pressure regulation nut 29 inner chamber roof, upper pressure regulating cavity 24 is passed and the pressure spring 34 leaned on hollow valve rod 27 end face in lower end, the top power of pressure spring 34 is greater than the top power of main power spring 23, therefore when not working, pressure spring 34 keeps hollow valve rod 27 being pushed to below, and primary seal is blocked up the gap of 22 tops from about about the 1mm of air extractor vent 20, thus lower discharge chamber 10 is kept being communicated with lower actuator chamber 7, in order to prevent hollow valve rod 27 from excessively moving down, hollow valve rod 27 being connected with and being positioned at lower pressure regulating cavity 25 and diameter is greater than the spacing preiection 48 of air extractor vent 20 diameter.

Conveniently understand the structure and working principle of first order pressure purger, now its working process is set forth as follows, as shown in Figure 3, when stepping on brake pedal and braking, the output pressure of brake activation valve enters upper actuator chamber 6 as the control presssure of relay valve from main driving induction opening 14, in plunger shaft 2 and upper discharge chamber 9, thus promote piston rod 12 slippage downwards and open shrouding 18 discharge chamber is communicated with inlet chamber 16, pressurized air now in storage tank enters lower discharge chamber 10 from the first braking induction opening 17 through inlet chamber 16, now, owing to being full of the larger pressurized air of pressure in lower discharge chamber 10, therefore, primary seal in tonifying Qi chamber 21 block up 22 by compression the pressure of air and the top power of main power spring 23 thus lean and shutoff on air extractor vent 20, in addition, while piston rod 12 slippage downwards, air in lower actuator chamber 7 suffers oppression and enters in lower pressure regulating cavity 25 from air extractor vent 20, and promote the top masterpiece elasticity that voltage regulation diaphragm 26 overcomes top pressure spring and heave thus promote hollow valve rod 27 and move up, once the lower surface of hollow valve rod 27 and primary seal stifled 22 form Separation, then descend the pressurized air in actuator chamber 7 will enter upper pressure regulating cavity 24 from this gap through hollow stem cavity, and finally enter air, this structure effectively can control the discharge velocity of air in lower actuator chamber 7, thus slow down piston rod 12 move down speed, avoid piston rod 12 to move down suddenly causing shrouding 18 to be opened excessive, cause pressurized air to discharge and excessively cause tire locking, as shown in Figure 1, when loosen the brake, piston rod 12 moves reset because the top of retracing spring 19 is tried hard to recommend on dynamic shrouding 18 and piston rod 12, this pressure at present in discharge chamber 10 reduces, hollow valve rod 27 is by the downward slippage of top power of pressure spring, its lower end again leans to block in primary seal and continue to lean primary seal and blocks up the top power overcoming main power spring 23 and move down, thus tonifying Qi chamber 21 is communicated with air extractor vent 20, now, air in lower discharge chamber supplements in lower actuator chamber 7 again, for braking is prepared next time.In addition, revolve the upper-lower height on seat 28 by turning pressure regulation nut 29 hollow thus regulate pressure spring 34 to hold out against the downward top power of hollow valve rod 27, thus the air controlled in lower actuator chamber 7 just can back down hollow valve rod 27 after reaching suitable air pressure loses heart, coreless valve bar 27 can be controlled in addition back down primary seal stifled 22 thus under being communicated with in discharge chamber and lower actuator chamber 7 after end of braking; Finally, powered piston rod 12 is provided to move down owing to adopting these three chambers of actuator chamber 6, plunger shaft 2 and upper discharge chamber 9 between piston rod 12 and upper valve body, stability when therefore increasing the propelling thrust of piston rod 12 and open shrouding 18, when avoiding the pressurized air transient pressure in lower discharge chamber 10 excessive, anti-push piston bar 12 upwards resets, cause shrouding 18 again to be closed, thus brake when occurring that tire occurs, time and the state of not braking.

Continue with reference to accompanying drawing, second stage anti-lock device comprises inlet chamber 16, now, the end mouth of this inlet chamber 16 does not carry out shutoff by any closeouts, thus make its lower end be in uncovered state, in addition, slide up and down in inlet chamber 16 and be connected with hollow piston cover 36, the outer peripheral face of hollow piston cover 36 contacts with the slipper seal of inlet chamber 16 inner peripheral surface, the top of hollow piston cover 36 offers the deflation hole 37 being communicated with its inner chamber and intercommunicating pore 35, the diameter of deflation hole is less than the intracavity diameter of hollow piston cover, the diameter of shrouding 18 is less than the intracavity diameter of hollow piston cover but is greater than deflation hole 37 diameter, and shrouding 18 be positioned at hollow piston cover 36 also shutoff on deflation hole 37, the end mouth of this hollow piston cover 36 carries out shutoff by base plate 38, base plate 38 is arranged in hollow piston cover inner chamber and its outer peripheral face and hollow piston overlap 36 inner peripheral surfaces is tightly connected, in order to fixed base plate 38, be positioned at below base plate 38 hollow piston cover 36 internal chamber wall on offer circlip groove, main back-up ring 39 is installed in circlip groove, therefore, base plate 38 carries out spacing preventing by main back-up ring 39 and skids off, in addition, base plate 38 top is provided with orienting sleeve 44, in orienting sleeve 44, slipper seal is connected with guide pillar 45, the upper end of guide pillar 45 is provided with the disk that diameter and shrouding diameter adapt, shrouding is connected to disk end face by bonding or screw, this shrouding preferred rubber material is made, and base plate 38 is also provided with the main ventilation orifice 56 being communicated with orienting sleeve 44 inner chamber and base plate underlying space, retracing spring 19 is sleeved on outside orienting sleeve 44 and guide pillar 45 and upper end and leans and lean on base plate 38 end face at disk bottom surface upper and lower end, and shrouding 18 keeps shutoff on deflation hole 37 under the pressure of retracing spring 19, the internal orifice of the first braking induction opening 17 extends on chamber, side, the stage casing wall of inlet chamber 16, on the stage casing sidewall of hollow piston cover 36, corresponding being provided with is communicated with the air channel 40 that its inner chamber and first brakes the internal orifice of induction opening 17, conveniently air channel 40 and first is braked induction opening 17 and is docked and connected, the preferred annular of this air channel is arranged on the ring-shaped ventilation groove on the stage casing periphery wall of hollow piston cover 36, and on the inner peripheral surface of ring-shaped ventilation groove, continue to offer the through hole that the annular air channel of multiple connection and hollow piston overlap 36 inner chambers, the bottom surface of lower valve body 5 is also provided with spring perch 41, spring perch 41 and hollow piston overlap and to be provided with upper end between 36 and to lean that hollow piston overlaps bottom 36, lower end leans the recoil spring 42 on spring perch 41, spring perch 41 is provided with and is communicated with secondary ventilation orifice 57 that is extraneous and spring perch inner chamber, in addition, spring perch 41 is also provided with the resilient dust pad 46 covering secondary ventilation orifice 57, therefore when braking, when the piston rod 12 moved down is pushed down suddenly shrouding 18 and is attempted to open, retracing spring 19 below shrouding 18 can withstand the base plate 38 of below and drives hollow piston cover 36 to overcome the downward slippage of top power of recoil spring 42 by pressurized, thus it is excessive to avoid piston rod 12 and shrouding 18 hard contact to cause shrouding 18 to be opened, causes pressurized air to discharge and excessively cause tire locking.

Certainly in order to improve the anti-lock performance of second stage anti-lock device further, the top of hollow piston cover 36 is provided with the ring sleeve 43 stretched in intercommunicating pore 35, the outer peripheral face of ring sleeve 43 contacts with the inner peripheral surface slipper seal of intercommunicating pore 35, accordingly, the inner chamber of ring sleeve 43 is communicated with deflation hole 37, in addition, the end face of hollow piston cover 36 starts overall diameter and overlaps the equal annular groove of 36 overall diameters with hollow piston, because the outer peripheral face of hollow piston cover 36 contacts with the slipper seal of inlet chamber 16 inner peripheral surface simultaneously, therefore this annular groove is formed in the end face of inlet chamber 16 and hollow piston and overlaps annular compartment 49 in sealing state between 36 tops, in order to gas can be inputted in annular compartment, the sidepiece of lower valve body is provided with the pair being communicated with annular compartment 49 and drives induction opening 50, this pair drives the outward opening place installation pipeline of induction opening 50 thus is communicated with the brake activation valve in operator's compartment, this pair drives the inner opening of induction opening 50 diminish gradually and be communicated with annular compartment 49, in addition, the bottom of lower valve body is also provided with the second braking induction opening 51, second braking induction opening 51 is communicated with air channel 40, the effect that this second braking induction opening 51 and first brakes induction opening 17 is the same, its outward opening keeps the moment to be communicated with respectively by pipeline with storage tank, the top of this second braking induction opening 51 is also provided with and is communicated with the secondary breather hole 52 driving induction opening 50, the secondary seal plug 53 of shutoff breather hole 52 is provided with in second braking induction opening 51, be positioned at below secondary seal plug 53 second braking induction opening 51 hole wall on secondary back-up ring 54 is installed, also being provided with upper end in second braking induction opening leans in secondary seal plug bottom surface, lower end leans the secondary power spring 55 on secondary back-up ring end face.Therefore when stepping on brake pedal, the a part of driving gas exported from brake activation valve enters upper valve body from main driving induction opening 14 and promotes piston rod and move down, another part driving gas also drives induction opening 50 to enter annular compartment 49 from pair simultaneously, owing to being full of the larger pressurized air of pressure in the second braking induction opening 51, therefore air extractor vent 52 blocks by secondary seal plug under the top power and compressed-air actuated pressure of secondary power spring, now, top power that hollow piston cover overcomes recoil spring moves down to drive induction opening 50 driving gas entered in annular compartment 49 to promote from pair, thus avoid the lower surface immediate roof of piston rod to lean against on shrouding end face it is opened instantaneously, hollow piston cover then stops moving down when cannot continue the top power overcoming recoil spring, now, this piston rod of effect due to first order anti-lock device slowly moves down its lower surface and can lean and it slowly opened on shrouding end face, when pair drives the air pressure in induction opening 50 excessive, secondary seal plug 53 will be backed down, the driving gas of its inside will be released in the second braking induction opening 51, when loosen the brake, the secondary air pressure reduction driven in induction opening 50, therefore hollow piston cover 36 moves reset on carrying out under the top power of recoil spring 42.

Claims

1. one kind has anti-lock function and braking pulsation-free relay valve, comprise valve body, it is characterized in that: in described valve body, be provided with the actuator chamber be communicated with successively from top to bottom, piston slip hole (1), plunger shaft (2), discharge chamber, intercommunicating pore (35) and inlet chamber (16), the middle slipper seal of piston slip hole (1) is connected with upper end and stretches in actuator chamber, the piston rod (12) in inlet chamber (16) can be stretched in lower end, the upper diaphragm (8) actuator chamber being divided into upper actuator chamber (6) and lower actuator chamber (7) is provided with in valve body, discharge chamber is divided into the lower diaphragm (11) of upper discharge chamber (9) and lower discharge chamber (10), upper diaphragm (8) and lower diaphragm (11) are affixed with piston rod (12), the piston (13) be connected on piston rod (12) is provided with in described plunger shaft (2), the braking deflation hole (15) of discharge chamber (10) under the main driving induction opening (14) valve body being provided with the upper actuator chamber (6) of connection, plunger shaft (2) and upper discharge chamber (9), the first braking induction opening (17) being communicated with inlet chamber (16) and connection, be provided with in inlet chamber (16) and link with piston rod (12) and the shrouding (18) of shutoff intercommunicating pore (35) and oppress the retracing spring (19) that shrouding (18) is in sealed condition, the sidepiece of described valve body is also provided with the uncovered pressure regulating cavity in the upper end that is communicated with successively, the air extractor vent (20) be communicated with lower actuator chamber (7) and the tonifying Qi chamber (21) be communicated with lower discharge chamber (10) from top to bottom, be provided with in tonifying Qi chamber (21) and the primary seal stifled (22) of shutoff air extractor vent (20) and compressing primary seal stifled (22) the main power spring (23) of sealed condition can be in, the voltage regulation diaphragm (26) pressure regulating cavity being divided into upper pressure regulating cavity (24) and lower pressure regulating cavity (25) is also sealedly connected with in described pressure regulating cavity, voltage regulation diaphragm (26) is connected with upper end to stretch into pressure regulating cavity (24), lower end and stretch into tonifying Qi chamber (21) through air extractor vent (20) and the hollow valve rod (27) in primary seal stifled (22) can be leaned, described hollow valve rod (27) is provided with axial pass-through holes, and described valve body is provided with the regulator regulating hollow valve rod (27) top power.

2. as claimed in claim 1 there is anti-lock function and braking pulsation-free relay valve, it is characterized in that: described regulator comprises screwing tight and revolves seat (28) and spiral shell is contained in the hollow pressure regulation nut (29) revolving seat (28) outer end pressure regulating cavity upper shed place hollow, hollow revolving in seat (28) inner chamber is provided with upper end and leans at pressure regulation nut (29) upper and lower end through upper pressure regulating cavity (24) lean the pressure spring (34) on hollow valve rod (27), and described pressure regulation nut (29) is provided with bleeder port (31).

3. as claimed in claim 2 there is anti-lock function and braking pulsation-free relay valve, it is characterized in that: described pressure regulation nut (29) is screwed with hold out against hollow revolve seat (28) hold out against screw (30).

4. as claimed in claim 3 there is anti-lock function and braking pulsation-free relay valve, it is characterized in that: described pressure regulation nut (29) is provided with the protective cover (33) covering and hold out against screw (30) and bleeder port (31).

5. as claimed in claim 1 there is anti-lock function and braking pulsation-free relay valve, it is characterized in that: the end mouth of described inlet chamber (16) is opened on the bottom surface of valve body, the diameter of described intercommunicating pore (35) is less than inlet chamber (16) diameter, described inlet chamber (16) interior slipper seal is connected with hollow piston cover (36), the roof of hollow piston cover (36) is provided with the deflation hole (37) being communicated with its inner chamber and intercommunicating pore (35), described shrouding (18) be positioned at hollow piston cover (36) and shutoff on deflation hole (37), the sealed bottom of described hollow piston cover (36) is connected with base plate (38), described base plate (38) top is provided with orienting sleeve (44), orienting sleeve (44) interior slipper seal is connected with guide pillar (45), the upper end of guide pillar (45) is provided with the disk connecting shrouding (18), base plate (38) is provided with the main ventilation orifice (56) being communicated with orienting sleeve (44) inner chamber and base plate underlying space, described retracing spring (19) be sleeved on orienting sleeve (44) and guide pillar (45) outside and its upper end leans on disk bottom surface, lower end leans on base plate (38) end face, the internal orifice of described first braking induction opening (17) extends on chamber, the side wall in the stage casing of inlet chamber (16), described hollow piston cover (36) sidewall is provided with and is communicated with the air channel (40) that its inner chamber and first brakes the internal orifice of induction opening (17), the bottom of described valve body is provided with spring perch (41), being provided with upper end between spring perch (41) and hollow piston cover (36) leans on hollow piston cover (36), lower end leans the recoil spring (42) on spring perch (41), described spring perch (41) is also provided with secondary ventilation orifice (57).

6. as claimed in claim 5 there is anti-lock function and braking pulsation-free relay valve, it is characterized in that: the top of described hollow piston cover (36) is provided with the ring sleeve (43) stretched in intercommunicating pore (35), the outer peripheral face of described ring sleeve (43) contacts with the inner peripheral surface slipper seal of intercommunicating pore (35), annular compartment (49) is provided with between the end face of described inlet chamber (16) and hollow piston cover (36) top, the sidepiece of described valve body is provided with the pair being communicated with annular compartment (49) and drives induction opening (50), the bottom of described valve body is provided with the second braking induction opening (51), described second braking induction opening (51) is communicated with air channel (40), the top of described second braking induction opening (51) is provided with and is communicated with the secondary breather hole (52) driving induction opening (50), be provided with the secondary seal plug (53) of shutoff breather hole (52) in described second braking induction opening (51) and oppress the secondary power spring (55) that secondary seal plug is in sealed condition.

7. as claimed in claim 5 there is anti-lock function and braking pulsation-free relay valve, it is characterized in that: described spring perch (41) is provided with the resilient dust pad (46) covering secondary ventilation orifice (57).

8. as there is anti-lock function and braking pulsation-free relay valve as described in arbitrary in claim 1-7, it is characterized in that: described shrouding (18) is made for elastomeric material.