Electrically controlled trailer emergency relay valve
The present invention relates to by the urgent servo technical field of drawbar trailer, particularly relate to a kind of by traction electrically controlled trailer emergency relay valve, be primarily adapted for use in various types of gas and brake by drawbar trailer.
Due to tractor and trailer be connected by rotating disk formed can two body bascules, in order to ensure its insensitivity, particularly when heavy duty is braked, the generation of the phenomenons such as overturning, front and back two folded body is caused in order to not make the inertia of trailer push away by force tractor, control for brake air pressure is set as front haulage headstock got over by trailer by prior art, forms pressure reduction. Owing to the quantitative relationship of pressure reduction can not change with trailer load condition, trailer braking protection valve is urgent, though trailer braking protection valve effect can be reached during heavy duty, but trailer afterbody gross mass is low time unloaded, tire road pavement attachment coefficient is little, easily causing trailer tyre locking rapidly during braking, aggravate tire abrasion, the trailer whipping under locking state causes vehicle accident etc. all can bring major traffic accidents and unnecessary loss.
Summary of the invention
It is an object of the invention to for existing by drawbar trailer zero load brake hard time be susceptible to vehicle tyre locking problem rapidly, there is provided a kind of by traction electrically controlled trailer emergency relay valve, can meet by drawbar trailer when heavy duty and zero load, can automatically adjust braking differential pressure, reach optimum braking effect.
For achieving the above object, present invention employs following technical scheme: a kind of electrically controlled trailer emergency relay valve, including upper cover, valve body, relay piston, valve member, and it is arranged on the gas-charging connection of upper cover and controls joint, being arranged on the braking joint of body base; Wherein, the upside of upper cover is provided with inflation tube chamber, and gas-charging connection is positioned at one end of inflation tube chamber, and the other end of inflation tube chamber seals and is fixed with plug, controls joint and is connected to inflation tube chamber sidewall; At gas tube cavity inner sleeve equipped with piston body, between piston body and plug, it is connected to thrust spring; Described piston body is provided with the left piston near gas-charging connection and the right piston near plug, only have left piston and gas tube cavity wall from gas-charging connection when inflating to seal and only have right piston when contact and reset and inflate tube chamber sealing and contact, further, during inflation, right piston moves to right right piston when making control joint and upper cover inner space reset and moves to left and make control joint and the isolation of upper cover cavity;Upper cover is connected with valve seal; Body cavity seals suit relay piston, being formed between upper surface and the upper cover of relay piston and form counter-pressure chamber between lower surface and the body cavity of normal pressure room, relay piston, wherein relay piston is positioned at the indoor upper surface area of normal pressure and is positioned at the lower surface area of counter-pressure chamber more than it; It is positioned at the valve inner below relay piston and is provided with valve box, valve member is positioned at valve box, top, valve box arranges valve port, and relay piston bottom arranges bottom conduit, and the lower edge diameter of this bottom conduit is used for valve member is opened and closed control less than the diameter of valve port; Being additionally provided with the QI invigorating pipeline with valve body lower portion inner space in valve body, this QI invigorating pipeline connects with described counter-pressure chamber, and between QI invigorating pipe outlet and counter-pressure chamber entrance on be provided with control air compensation size electromagnetic valve; Described electromagnetic valve includes one and seals fixing connection dish with described body wall, is set with sleeve connecting disk center, be set with in sleeve can two-way valve rod in axial sliding, be connected to back-moving spring between sleeve and two-way valve rod; The back-end sealing of sleeve is fixed with joint, is provided with exhaust branch in joint, and exhaust branch is connected with described lower guide tube cavity by discharge duct; The rear end of joint is fixed on insulation body by locking plate; The left end of described two-way valve rod and QI invigorating pipe outlet form the entrance of left valve, the right-hand member of two-way valve rod and exhaust branch and form right valve; And be provided with gap between sleeve and two-way valve rod, so that counter-pressure chamber can connect with left valve and can connect with right valve; Described annular gap chamber between insulation body and sleeve is provided with coil windings and binding post.
The left end of described piston body arranges inner chamber, is set with and the check valve of gas-charging connection fitted seal in inner chamber. Intracavity sidewall at described piston body left end is provided with gas outlet, and gas outlet is positioned at the left end of left piston; The aerating pipe connected with trailer gas bomb it is provided with in valve body side; The gas outlet of piston body left end inner chamber connects with aerating pipe.
Described valve member includes sealing shroud and is fixed in the valve seat bottom valve box, is set with the valve of hollow in valve seat, and valve upper end seals with valve port and docks, and is connected to valve spring between valve seat and valve; Body cavity outside valve port connects with braking joint, and the valve box inside valve port connects with inlet suction port, and valve cavity connects as exhaust passage with described lower guide tube cavity. In the middle part of the lower port of described valve seat, by screw, dust-proof cushion is installed.
Based on above technical scheme, the present invention has the following technical effect that electrically controlled trailer emergency relay valve adopts electric integrated technology, and driver can control air pressure according to manual switch trailer heavily loaded, unloaded, improves above-mentioned background technology shortcoming. This technology has good brake coordination and reliability; Electrically controlled trailer emergency relay valve simple in construction performance is stable, easy for installation. Electrically controlled trailer emergency relay valve superior performance, simple in construction, easy for installation, the suitability are strong, have stronger Social benefit and economic benefit. Wide market, it is easy to promote.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the present invention;
Fig. 2 is the A-A cross-sectional view of Fig. 1;
Fig. 3 is the top view of Fig. 1.
Number in the figure is expressed as: 1. screw, 2. plain washer, 3. dust-proof cushion, 4. circlip, 5.O shape circle, 6. valve spring, 7.O shape circle, 8. valve seat, 9. valve, 10. check ring, 11.O shape circle, 12. back-moving spring, 13.O shape circle, 14. relay piston, 15.O shape circle, 16.O shape circle, 17. upper cover, 18. steel ball, 19. valve body, 20. pressing plate, 21. hog frame, 22. insulation cover body, 23. coil windings, 24. planar sealing pad, 25. connection dish, 26. back-moving spring, 27. two-way valve rod, 28. sleeve, 29.O shape circle, 30. joint, 31. fixing nut, 32. locking plate, 33.O shape circle, 34. plug, 35.O shape circle, 36. gas-charging connection, 37.O shape circle, 38. valve port, 39. planar sealing pad, 40. one-way cock, 41. back-moving spring, 42.O shape circle, 43. piston body, 44.O shape circle, 45.O shape circle, 46. plug, 47.O shape circle, 48. thrust spring, 49. bolt, 50. lock washer, 51. binding post, 52. QI invigorating pipeline, 53a. control joint one, 53b. control joint two, 54. inflation tube chamber, 55. left piston, 56. right piston, 57. filling channel, 58. trailer gas bomb joint, 59. normal pressure room, 60. counter-pressure chamber, 61 exhaust chambers, 62 bottom conduits, 63a. braking joint one, 63b. braking joint two, 64 discharge ducts, 65 is gas outlet, and 66 is valve box, and 67 is valve port, and 68 is exhaust branch pipe, and 69 is circular cone three clearance opening.
Detailed description of the invention
Electrically controlled trailer emergency relay valve is used to control the auxiliary device of trailer braking protection valve, and its principle is with reference to accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3.
The upside of upper cover 17 is provided with inflation tube chamber 54, and with the left end that the tank connected gas-charging connection 36 of main car gas storage is positioned at inflation tube chamber 54, the right-hand member of inflation tube chamber 54 seals and is fixed with plug 46. Joint 53a and the 53b that controls for controlling brake is connected to the sidewall of inflation tube chamber 54.
In inflation tube chamber 54, it is set with piston body 43, between piston body 43 and plug 46, is connected to thrust spring 48. The left end of piston body 43 arranges inner chamber, is set with and the check valve of gas-charging connection fitted seal in inner chamber. Referring to accompanying drawing 2, source of the gas air pressure is inputted by the gas-charging connection 36 of upper cover 17, by being located at the check valve of valve port 38 on piston body 43, planar sealing pad 39, one-way cock 40, back-moving spring 40 composition.
Intracavity sidewall at piston body 43 left end is provided with gas outlet 65; The aerating pipe 57 connected with trailer gas bomb joint 58 it is provided with in the side of valve body 19; Gas outlet 65 connects with aerating pipe 57. The bottom of aerating pipe 57 connects with in valve box 66, connects with trailer gas bomb joint 58 simultaneously.
When gas-charging connection 36 is without air pressure, piston body 43 is moved to the left under thrust spring 48 acts on, and now piston body 43 is in reset state; When gas-charging connection 36 has air pressure, piston body 43 moves right. Piston body 43 is provided with the left piston 55 near gas-charging connection and the right piston 56 near plug. Only have left piston 55 when inflating from gas-charging connection to contact with inflation tube chamber 54 inner wall sealing, only have right piston 56 during reset and contact with inflation tube chamber 54 sealing. Further, during inflation, right piston 56 moves to right right piston 56 when making control joint 53a and 53b and upper cover inner space reset and moves to left and make control joint 53a and 53b isolate with upper cover cavity. Upper cover 17 and valve body 19 are tightly connected.
The inner chamber of valve body 19 seals suit relay piston 14, is formed between upper surface and the upper cover 17 of relay piston 14 and between lower surface and the body cavity of normal pressure room 59, relay piston 14, form counter-pressure chamber 60. Wherein relay piston 14 is positioned at the upper surface area of normal pressure indoor 59 and is positioned at the lower surface area of counter-pressure chamber 60 more than it.
Valve member is positioned at valve box 66, top, valve box 66 arranges valve port 67, relay piston 14 bottom arranges bottom conduit 62, the lower edge diameter of this bottom conduit 62 is less than the diameter of valve port 67, bottom conduit 62 is for opening and closing control to valve member, when relay piston 14 is depressed into after to a certain degree, bottom conduit 62 promotes valve 9 and liner to move down, and makes valve port 67 be opened. Valve member includes sealing shroud and is fixed in the valve seat 8 bottom valve box 66, is set with the valve 9 of hollow in valve seat 8, and valve 9 upper end is docked with valve port 67 sealing by liner, is connected to valve spring 6 between valve seat 8 and valve 9; Body cavity outside valve port 67 connects with braking joint 63a and 63b, and the valve box inside valve port 67 connects with gas bomb inlet suction port, valve cavity and bottom conduit 62 inner space, as exhaust passage. The zigzag passage that valve body 19, valve seat 8, valve 9, check ring 10, back-moving spring 6 and other rubber seal element are formed. In the middle part of the lower port of described valve seat 8, by screw, dust-proof cushion is installed.
Being provided with the QI invigorating pipeline 52 with valve body lower portion inner space in valve body 19, this QI invigorating pipeline 52 connects with described counter-pressure chamber 60, and is provided with the electromagnetic valve controlling air compensation size on QI invigorating pipeline 52.Specifically, referring to Fig. 1, it is fixed with one with the sealing of valve body 19 sidewall and is connected the dish 25 intrinsic pressing plate 20 of connection dish outer sheath, the center of connection dish 25 is equipped with sleeve 28, be set with in sleeve 28 can two-way valve rod 27 in axial sliding, be connected to back-moving spring 26 between sleeve 28 and two-way valve rod 27. The back-end sealing of sleeve 28 is fixed with joint 30, is provided with exhaust branch 68 in joint 30, and exhaust branch 68 is by discharge duct 64 and described bottom conduit 62 inner space. The entrance that the left end of two-way valve rod 27 forms left valve, the right-hand member of two-way valve rod 27 and exhaust branch 68 with QI invigorating pipeline 52 outlet forms right valve; And be provided with gap between sleeve 28 and two-way valve rod 27, so that counter-pressure chamber 60 can connect with left valve and can connect with right valve. The rear end of joint 30 is fixed on insulation body 22 by locking plate 32, annular gap chamber between insulation body 22 and sleeve 28 is provided with coil windings 23, the intrinsic hog frame 21 of coil windings 23 inner sleeve, one end of coil windings is connected with positive terminal, and the other end is connected with vehicle frame.
When gas-charging connection 36 sets up air pressure, the sealing piston end surface that O 42 is formed, spacing by air pressure thrust piston body 43 other end and plug 46 roundlet step surface, driving O 44 normally closed with the keying valve that axial piston body 43 is formed, O 45 and upper cover 17 medial surface combine (accompanying drawing 2) simultaneously: the keying valve of circular cone three clearance opening 69 composition is normally opened. When the input of brake signal air pressure controls joint 53a or 53b,Flow through the gap between circular cone three clearance opening 69 and O 45, enter the malleation air chamber 59 being made up of relay piston 14, O 15, O 16, upper cover 17, valve body 19, promote the gap between the descending elimination relay piston 14 of relay piston 14 and valve 9, open the porous such as valve 9, air pressure Split flow brake joint 63a or 63b. Wherein braking joint two hole path for controlling trailer front wheel braking is little, and purpose controls trailer front wheel for choked flow, because of factor low after height before trailer, front tyre road pavement adhesive force is little, additionally front-wheel rapid heat dissipation, brake block is big to brake hubs coefficient of friction, and front wheel brake is quick on the draw easy locking. Electrically controlled trailer emergency relay valve after improvement can reach three bridge brake synchronous. Valve is opened the sealing disc simultaneously formed by relay piston 14 and O 13 and is produced counter-pressure, owing to relay piston 14 malleation air chamber gas pressure area is more than back-pressure air chamber, forms drawing head and trailer pressure reduction. During releasing braking, relay piston 14 is by back-moving spring 12 auxiliary reset, and valve simultaneously closes off, brake chamber air pressure backtracking, by the gap between relay piston 14 and valve 9, discharges through valve 9 endoporus and dust-proof cushion 3.
Electrically controlled trailer emergency relay valve has auto-lock function: when tractor and trailer need to separate, should first disconnect gas-charging connection 36 source of the gas before separation. With reference to accompanying drawing 2: after disconnection, one-way cock 40 is closed, piston body 43 and assembly thereof are resetted by thrust spring 48. Close with the keying valve that O 45 is main composition, open with the keying valve that O 44 is main composition. The air pressure of the gas outlet of piston body front end intracavity sidewall enters malleation air chamber 59 through the gap between O 44 and upper cover 17 endoporus, and air pressure promotes relay piston 14 produce braking or be automatically locked.
Two-position three way magnetic valve is adopted to integrate principle, with reference to accompanying drawing 1: mounting bracket or vehicle frame connect power cathode, with reference to accompanying drawing 3, are provided with on and off switch between positive terminal 51 and power supply;Connection power supply during unloaded driving, with reference to accompanying drawing 1: the magnetic force that magnetic coil 23 produces forces two-way valve rod 27 to drive compression reseting spring 26, B end stroke is only located at the valve port contact on joint 30, spacing and seal, A end valve mouth is opened simultaneously, air pressure enters the anti-air-pressure chamber formed by O 13, relay piston 14, O 15 and valve body 19, reduces pressure reduction. Now output pressure reduction is deducted O 13 position circle area by the O 13 position circle area being located on relay piston 14, poor equal to output pressure, releases and brakes this function air pressure backtracking. Braking can be reached soft steadily, release retro-speed fast. Closing power supply during heavy duty braking, contrary A end valve mouth is closed, and B end valve mouth is opened, relay piston 14 axial reciprocating, and counter-pressure chamber is by the inner space of exhaust branch pipe and exhaustor and bottom conduit 62, and is in communication with the outside by dust-proof cushion 3, is exhausted or bleeds. Now braking is in potent state, can good control heavy duty stability or inertia.