CN104527628A - Micro-motion function and hydraulic brake control system of wheeled dozer - Google Patents
Micro-motion function and hydraulic brake control system of wheeled dozer Download PDFInfo
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- CN104527628A CN104527628A CN201410839139.5A CN201410839139A CN104527628A CN 104527628 A CN104527628 A CN 104527628A CN 201410839139 A CN201410839139 A CN 201410839139A CN 104527628 A CN104527628 A CN 104527628A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
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- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The invention discloses a micro-motion function and hydraulic brake control system of a wheeled dozer, and belongs to the field of wheeled dozers. The micro-motion function and hydraulic brake control system comprises an oil tank, an oil suction filter, a gear pump, a high-pressure filter, a prefilling valve, a micro-motion oil cylinder, a left pedal valve, a pressure switch, a brake valve set, a right pedal valve, a shuttle valve set, a rear axle brake, a front axle brake and a parking brake. Through the left pedal valve (micro-motion function pedal valve), a driver can effectively control tire drive force by combining the condition that the tire drive force ranges from 0 percent to 100 percent, wheel slipping is avoided, tire abrasion is reduced, and therefore engine power can be effectively utilized, oil consumption can be reduced, and circulating speed can be improved. According to the micro-motion function, the tire drive force is effectively controlled, meanwhile, emergency braking can be achieved through a service brake, and the reliability and running safety of a brake system are obviously increased. Main elements of the control system are integrated on the brake valve set, pipe connection is simplified greatly, and pipe arrangement is more reasonable.
Description
Technical field
The present invention relates to a kind of wheel bulldozer fine motion function and hydraulic braking control system, belong to wheel bulldozer field.
Background technology
Current wheel bulldozer is without fine motion function, and running brake cannot use as emergency braking simultaneously, and brake system adopts air-operated hydraulic brake system or all-hydraulic wet brake system usually in addition.Braking during standstill adopts bar handle to pull flexible axle, makes brake strap spreading, realizes braking during standstill.Above function chaufeur effectively cannot control complete machine tire propulsive effort, causes tyre slip, increases wear on tyres, therefore unavoidably occurs engine power loss.There is the shortcomings such as braking during standstill manipulation is relatively more heavy, parking weak effect in addition.
Summary of the invention
Object of the present invention provides a kind of wheel bulldozer fine motion function and hydraulic braking control system for weak point existing in above-mentioned prior art just.
Object of the present invention realizes by following technique measures:
The present invention is by the setting of left-hand tread plate valve (fine motion function treadle valve), chaufeur is made between 0% to 100%, effectively to control tire propulsive effort in conjunction with tire propulsive effort, prevent tyre skidding, reduce wear on tyres, effectively can use engine power like this, reduce oil consumption, accelerate rate of circulation.Fine motion function, while effectively controlling tire propulsive effort, can also realize emergency braking by running brake, significantly increases brake system reliability and travel safety.The main element of this control system is integrated in brake activation valve group, enormously simplify pipeline and connects, make piping layout more reasonable.
Concrete technical measures of the present invention are as follows:
As shown in Figure 1, a kind of wheel bulldozer fine motion function of the present invention and hydraulic braking control system comprise fuel tank, oil absorption filter, gear type pump, high pressure filter, prefill valve, micro-motion oil cylinder, left-hand tread plate valve (fine motion function treadle valve), pressure switch, brake activation valve group, right-hand tread plate valve (pilot-operated type brake pedal valve), shuttle valve valve group, rear axle brake vi, propons drg, Parking Brake; Described brake activation valve group is integrated form valve block, comprises propons energy storage, back axle energy storage, emergency braking electromagnetic valve, the low warning of parking pressure, automatic emergency brake switch, the low warning of brake-pressure, parking electromagnetic valve, the first energy storage blowoff valve, the second energy storage blowoff valve; Wherein, the oil inlet of described gear type pump is connected with fuel tank by oil absorption filter, and the oil outlet of gear type pump is connected with the P mouth of prefill valve by high pressure filter; The oil return T mouth of described prefill valve, O mouth connect fuel tank respectively, and the A1 mouth that A1 mouth connects brake activation valve group is connected with propons energy storage, and the A2 mouth that A2 mouth connects brake activation valve group is connected with back axle energy storage, and SW mouth connects the SW mouth of brake activation valve group; The P1 mouth of brake activation valve group connects the P1 mouth of right-hand tread plate valve, P2 mouth connects the P2 mouth of right-hand tread plate valve, PX mouth connects the PX mouth of right-hand tread plate valve, C mouth connects Parking Brake, KG1 mouth connects the low warning of brake-pressure, KGAA connects automatic emergency brake switch, and KG2 connects the low warning of parking pressure, and T mouth connects fuel tank; The P3 mouth of described left-hand tread plate valve connects the P1 mouth of brake activation valve group, and A3 mouth connects micro-motion oil cylinder and pressure switch, and T mouth connects fuel tank; The B1 mouth of described right-hand tread plate valve connects the B1 mouth of shuttle valve valve group (brake taillight pressure switch) and is connected with propons drg, and B2 mouth connects the B2 mouth of shuttle valve valve group (brake taillight pressure switch) and is connected with rear axle brake vi, and T mouth connects fuel tank; The E1 mouth of described emergency braking electromagnetic valve is connected with the SW mouth of brake activation valve group, KGAA mouth, KG1 mouth respectively, and the E2 mouth of emergency braking electromagnetic valve is connected with the T mouth of brake activation valve group, and the E3 mouth of emergency braking electromagnetic valve is connected with the PX mouth of brake activation valve group; The D1 mouth of described parking electromagnetic valve is connected with back axle energy storage, and the D2 mouth of parking electromagnetic valve is connected with the T mouth of brake activation valve group, and the D3 mouth of parking electromagnetic valve is connected with the C mouth of brake activation valve group; The F1 mouth of described first energy storage blowoff valve is connected with the A1 mouth of brake activation valve group, the corresponding interface of propons energy storage, the P1 mouth of brake activation valve group respectively, and the F2 mouth of the first energy storage blowoff valve is connected with the T mouth of brake activation valve group; The H1 mouth of described second energy storage blowoff valve is connected with the A2 mouth of brake activation valve group, the P mouth of brake activation valve group respectively, and the second energy storage blowoff valve H2 mouth is connected with the T mouth of brake activation valve group.
Between the P mouth of the prefill valve described in the present invention and 0 mouthful, safety valve is housed.
Shuttle valve valve group described in the present invention is the integrated form valve block (pressure switch can preferentially sense pressure higher in brake system, effectively improves the unlatching of braking taillight) being integrated with filter core, check valve, pressure switch.
High pressure filter described in the present invention is the integrated form valve block being integrated with filter core, check valve, pressure switch.
Prefill valve described in the present invention is used for energy storage topping up, there is provided power to brake system, between the P mouth of prefill valve and 0 mouthful, safety valve is housed, its effect ensures that gear type pump is when delivery pressure is too high because of fault, prefill valve, by O mouth oil spilling, avoids the braking element damaging rear end.
The C mouth of the brake activation valve group described in the present invention is equipped with parking electromagnetic valve, and its effect is: when park brake switch switches in parking or release two states, parking electromagnetic valve switches thereupon, and complete machine carries out parking or release; Park brake switch is when release position, and braking during standstill electromagnetic valve obtains electric, and spool moves, the oil of brake activation valve group flows to Parking Brake through parking electromagnetic valve, the spring thrust in the oil pressure counter contained spring chamber of Parking Brake, the friction lining of Parking Brake is separated, and removes parking; Park brake switch when parked state, the power-off of parking electromagnetic valve, spool return, the hydraulic oil of Parking Brake inside, by the C mouth of brake activation valve group, flows back to fuel tank through parking electromagnetic valve, Parking Brake under spring thrust effect, implement parking; The KG1 mouth of described brake activation valve group is equipped with the low warning of brake-pressure, KGAA mouth is equipped with automatic emergency brake switch, KG2 mouth is equipped with the low warning of parking pressure, and C mouth connects Parking Brake, and T mouth connects fuel tank; The D1 mouth of described parking electromagnetic valve is connected with back axle energy storage, and the D2 mouth of parking electromagnetic valve is connected with the T mouth of brake activation valve group, and the D3 mouth of parking electromagnetic valve is connected with the C mouth of brake activation valve group; The F1 mouth of described first energy storage blowoff valve is connected with the A1 mouth of brake activation valve group, the corresponding interface of propons energy storage, the P1 mouth of brake activation valve group respectively, and the F2 mouth of the first energy storage blowoff valve is connected with the T mouth of brake activation valve group; The H1 mouth of described second energy storage blowoff valve is connected with the A2 mouth of brake activation valve group, the P mouth of brake activation valve group respectively, and the second energy storage blowoff valve H2 mouth is connected with the T mouth of brake activation valve group.The low alarm function of brake-pressure is, when the pressure of brake system is lower than setting pressure, exports electric signal and report to the police, prompting chaufeur checks; Automatic emergency brake on-off action is, when the pressure of brake system is lower than setting pressure, exports electric signal, controls vehicle and implements autobrake; The effect of the low warning of parking pressure is, when the pressure of Parking Brake is lower than setting pressure, exports electric signal and report to the police, prompting chaufeur checks; The effect of energy storage blowoff valve is; when complete machine brake system needs shutdown maintenance; rotate energy storage blowoff valve switch; make energy storage blowoff valve switch be in release position, the hydraulic oil at this moment in forward and backward bridge energy storage gets back to fuel tank, without pressure in guarantee system; easy to maintenance, quick; avoid in system, there is elevated pressures to hurt sb.'s feelings, after complete machine maintenance, make energy storage blowoff valve switch return.
The principle of work of the left-hand tread plate valve (fine motion function treadle valve) described in the present invention is as follows: when gently stepping on left-hand tread plate valve, oil is transported to micro-motion oil cylinder, micro-motion oil cylinder controls change speed gear box valve rod, realize gearbox dynamic to switch, change speed gear box is made to export effective power, power will pass to drive axle, make wheel export rational propulsive effort.In addition when left-hand tread plate valve is floored, pressure reaches setting value, pressure switch output signal, and emergency braking electromagnetic valve obtains electric, and the oil of brake activation valve group flows to the PX mouth of right-hand tread plate valve through PX mouth, right-hand tread plate valve core moves down, and forward and backward lock of controller, realizes emergency braking.The setting of left-hand tread plate valve can make chaufeur between 0% to 100%, effectively control tire propulsive effort in conjunction with tire propulsive effort in addition, prevents tyre skidding, reduces wear on tyres, effectively can use engine power like this, reduces oil consumption, accelerate rate of circulation.In addition, Parking Brake and running brake can be used as emergency braking and use, and significantly increase brake system reliability and travel safety.
Right-hand tread plate valve (pilot-operated type brake pedal valve) described in the present invention possesses pilot control function, principle of work is as follows: valve has two independently pressure outputs, independently can implement braking to the forward and backward drg of complete machine, if a road brake system wherein breaks down, normal work can be continued in an other road of valve; The feature of guide is to be operated by Remote Hydraulic signal in addition, can realize emergency braking, guarantee complete machine traffic safety.
The principle of work of the Parking Brake described in the present invention is as follows: Parking Brake is as while braking during standstill, can also use as accident brake, this drg is brake application by spring, the disc type brake of hydraulic pressure release, be arranged on the power intake of front driving axle, and can manual separation be realized, so that the movement of complete machine under engine off state.
The principle of work of complete machine brake system of the present invention is as follows: when complete machine needs emergency braking, two kinds of emergency braking forms can be adopted, the first: chaufeur presses lower parking electromagnetic valve to emergency braking enforcing location, the power-off of parking electromagnetic valve, spool return, the hydraulic oil of Parking Brake inside, by the C mouth of brake activation valve group, flow back to fuel tank through parking electromagnetic valve, Parking Brake, under spring thrust effect, implements emergency braking.The second: chaufeur steps on left-hand tread plate valve (fine motion function treadle valve is floored), when pressure reaches setting value, pressure switch output signal, emergency braking electromagnetic valve obtains electric, the oil of brake activation valve group flows to the PX mouth of right-hand tread plate valve through PX mouth, right-hand tread plate valve core moves down, forward and backward lock of controller, realize emergency braking, ensure that the travel safety of complete machine.
Beneficial effect of the present invention is as follows:
1, the present invention effectively controls tire propulsive effort, the object of reach energy-conservation, increasing work efficiency by increasing left-hand tread plate valve (fine motion function treadle valve).
2, the present invention is the main element of brake system, is integrated in brake activation valve group, enormously simplify pipeline and connects, make piping layout more reasonable.
3, the present invention is hydraulic pressure release by Parking Brake, and brake application by spring reaches control comfort, simply, reduces chaufeur labour intensity.
4, the running brake that controlled by fine motion function of the present invention and Parking Brake two kinds of brake mode, realized emergency brake system controlling functions, effectively realize vehicle and stop immediately advancing in normally running at high speed, guarantee personal safety.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of fine motion function of the present invention and hydraulic braking control system.
Sequence number in figure: 1, fuel tank; 2, oil absorption filter; 3, gear type pump; 4, high pressure filter; 5, prefill valve; 6, micro-motion oil cylinder; 7, left-hand tread plate valve (fine motion function treadle valve); 8, pressure switch; 9, propons energy storage; 10, back axle energy storage; 11, brake activation valve group; 12, emergency braking electromagnetic valve; 13, right-hand tread plate valve (pilot-operated type brake pedal valve); 14, shuttle valve valve group; 15, rear axle brake vi; 16, propons drg; 17, Parking Brake; 18, the low warning of parking pressure; 19, automatic emergency brake switch; 20, the low warning of brake-pressure; 21, parking electromagnetic valve; 22, the first energy storage blowoff valve; 22-1, the second energy storage blowoff valve.
Detailed description of the invention
The present invention is further described below with reference to embodiment (accompanying drawing):
As shown in Figure 1, a kind of wheel bulldozer fine motion function of the present invention and hydraulic braking control system comprise fuel tank 1, oil absorption filter 2, gear type pump 3, high pressure filter 4, prefill valve 5, micro-motion oil cylinder 6, left-hand tread plate valve (fine motion function treadle valve) 7, pressure switch 8, brake activation valve group 11, right-hand tread plate valve (pilot-operated type brake pedal valve) 13, shuttle valve valve group 14, rear axle brake vi 15, propons drg 16, Parking Brake 17; Described brake activation valve group 11 is integrated form valve block, comprises propons energy storage 9, back axle energy storage 10, emergency braking electromagnetic valve 12, the low warning of parking pressure 18, automatic emergency brake switch 19, the low warning 20 of brake-pressure, parking electromagnetic valve 21, first energy storage blowoff valve 22, second energy storage blowoff valve 22-1; Wherein, the oil inlet of described gear type pump 3 is connected with fuel tank 1 by oil absorption filter 2, the oil outlet of gear type pump 3 is connected (when the contaminant particle gathered in high-pressure filter 4 is too much by high pressure filter 4 with the P mouth of prefill valve 5, the pressure switch of high-pressure filter 4 closes, the warning light of instrument desk is bright, the cleaning of prompting chaufeur or more renew cartridge, avoid contaminant particle to block the braking element of rear end); The A1 mouth that the oil return T mouth of described prefill valve 5, O mouth connect fuel tank 1, A1 mouth connection brake activation valve group 11 is respectively connected with propons energy storage 9, and the A2 mouth that A2 mouth connects brake activation valve group 11 is connected with back axle energy storage 10, and SW mouth connects the SW mouth of brake activation valve group 11; The P1 mouth of brake activation valve group 11 connects the P1 mouth of right-hand tread plate valve 13, P2 mouth connects the P2 mouth of right-hand tread plate valve 13, PX mouth connects the PX mouth of right-hand tread plate valve 13, C mouth connects Parking Brake 17, KG1 mouth connects the low warning 20 of brake-pressure, KGAA connects automatic emergency brake switch 19, KG2 and connects parking pressure low warning 18, T mouth connection fuel tank 1; The P3 mouth of described left-hand tread plate valve 7 connects the P1 mouth of brake activation valve group 11, and A3 mouth connects micro-motion oil cylinder 6 and pressure switch 8, T mouth connects fuel tank 1; The B1 mouth of described right-hand tread plate valve 13 connects shuttle valve valve group 14(brake taillight pressure switch) B1 mouth and be connected with propons drg 16, B2 mouth connects shuttle valve valve group 14(brake taillight pressure switch) B2 mouth and be connected with rear axle brake vi 15, T mouth connection fuel tank 1; The E1 mouth of described emergency braking electromagnetic valve 12 is connected with the SW mouth of brake activation valve group 11, KGAA mouth, KG1 mouth respectively, and the E2 mouth of emergency braking electromagnetic valve 12 is connected with the T mouth of brake activation valve group 11, and the E3 mouth of emergency braking electromagnetic valve 12 is connected with the PX mouth of brake activation valve group 11; The D1 mouth of described parking electromagnetic valve 21 is connected with back axle energy storage 10, and the D2 mouth of parking electromagnetic valve 21 is connected with the T mouth of brake activation valve group 11, and the D3 mouth of parking electromagnetic valve 21 is connected with the C mouth of brake activation valve group 11; The F1 mouth of described first energy storage blowoff valve 22 is connected with the A1 mouth of brake activation valve group 11, the corresponding interface of propons energy storage 9, the P1 mouth of brake activation valve group 11 respectively, and the F2 mouth of the first energy storage blowoff valve 22 is connected with the T mouth of brake activation valve group 11; The H1 mouth of described second energy storage blowoff valve 22-1 is connected with the A2 mouth of brake activation valve group 11, the P mouth of brake activation valve group 11 respectively, and the second energy storage blowoff valve H2 mouth is connected with the T mouth of brake activation valve group 11.
Between the P mouth of the prefill valve 5 described in the present invention and 0 mouthful, safety valve is housed.
Shuttle valve valve group 14 described in the present invention is for being integrated with the integrated form valve block of filter core, check valve, pressure switch.Pressure switch can preferentially sense pressure higher in brake system, effectively improves the unlatching of braking taillight, to subsequent vehicle one warning, needs subsequent vehicle to keep a failure-free operating range.
High pressure filter 4 described in the present invention is for being integrated with the integrated form valve block of filter core, check valve, pressure switch.Its effect is the colloid, asphaltene etc. that the mechanical admixture that is mixed in filtering hydraulic oil and the chemical change of hydraulic oil own produce, thus prevent spool jam and Hydraulic Elements from crossing the generation of the faults such as quick-wearing, this filter is provided with differential pressure signaling device, when spool contamination and plugging reaches setting value to oil inlet and outlet pressure reduction, namely pressure switch closes, the warning light of instrument desk is bright, the cleaning of prompting chaufeur or more renew cartridge, avoids contaminant particle to block the braking element of rear end.
Prefill valve described in the present invention is used for energy storage topping up, there is provided power to brake system, between the P mouth of prefill valve and 0 mouthful, safety valve is housed, its effect ensures that gear type pump is when delivery pressure is too high because of fault, prefill valve, by O mouth oil spilling, avoids the braking element damaging rear end.
The C mouth of the brake activation valve group 11 described in the present invention is equipped with parking electromagnetic valve 21, and its effect is: when park brake switch switches in parking or release two states, parking electromagnetic valve 21 switches thereupon, and complete machine carries out parking or release; Park brake switch is when release position, and parking electromagnetic valve 21 obtains electric, and spool moves, the oil of brake activation valve group 11 flows to Parking Brake 17 through parking electromagnetic valve 21, the spring thrust in the oil pressure counter contained spring chamber of Parking Brake 17, the friction lining of Parking Brake 17 is separated, and removes parking; Park brake switch is when parked state, parking electromagnetic valve 21 power-off, spool return, the hydraulic oil of Parking Brake 17 inside flows to the T mouth of brake activation valve group 11 through parking electromagnetic valve 21 by the C mouth of brake activation valve group 11, then the T mouth through brake activation valve group 11 flows back to fuel tank 1, Parking Brake 17, under spring thrust effect, implements parking; The KG1 mouth of described brake activation valve group 11 is equipped with the low warning of brake-pressure 20, KGAA mouth is equipped with automatic emergency brake switch 19, KG2 mouth is equipped with the low warning 18 of parking pressure, emergency braking electromagnetic valve 12, parking electromagnetic valve 21, energy storage blowoff valve 22; Low warning 20 effect of brake-pressure is, the low warning 20 of brake-pressure is connected with operator's compartment inside brake pressure display lamp, and when the pressure of brake system is lower than setting pressure, export electric signal in operator's compartment and report to the police, prompting chaufeur checks; Automatic emergency brake switch 19 effect is, automatic emergency brake switch 19 is connected with emergency braking electromagnetic valve 12, when the pressure of brake system is lower than setting pressure, exports electric signal, and emergency braking electromagnetic valve 12 obtains electric, controls vehicle and implements automatic emergency brake; The effect of the low warning 18 of parking pressure is, the low warning 18 of parking pressure is connected with parking lamp in operator's compartment, and when the pressure of Parking Brake 17 is lower than setting pressure, export electric signal in operator's compartment and report to the police, prompting chaufeur checks; The effect of energy storage blowoff valve 22 is; when complete machine brake system needs shutdown maintenance; rotate energy storage blowoff valve switch; energy storage blowoff valve switch is made to be in release position; at this moment fuel tank got back to by the hydraulic oil in forward and backward bridge energy storage; without pressure in guarantee system, avoid in system, there is elevated pressures and hurt sb.'s feelings.
The principle of work of the left-hand tread plate valve (fine motion function treadle valve) 7 described in the present invention is as follows: when gently stepping on fine motion function treadle valve 7, hydraulic oil flows to A3 mouth by the P1 mouth of brake activation valve group 11 through the P3 of left-hand tread plate valve 7, then micro-motion oil cylinder 6 is flow to, the spring of compression micro-motion oil cylinder inside, micro-motion oil cylinder valve rod is stretched out, and promote change speed gear box valve rod and retract, change speed gear box exports different moments of torsion by the length that valve rod is retracted, moment of torsion will pass to drive axle, make wheel export rational propulsive effort.Pressure switch 8 is connected with emergency braking electromagnetic valve 12 in addition, the pressure set points of pressure switch 8 is slightly less than the maximum delivery pressure of left-hand tread plate valve 7, when left-hand tread plate valve delivery pressure reaches pressure switch setting value, when namely left-hand tread plate valve is floored, pressure switch 8 closes, emergency braking electromagnetic valve 12 obtains electric, the oil of brake activation valve group 11 flows to the PX mouth of right-hand tread plate valve 13 through PX mouth, right-hand tread plate valve core moves down, now the P1 mouth of right-hand tread plate valve 13 communicates with B1 mouth, P2 mouth communicates with B2 mouth, before, rear brake locking, realize emergency braking, now do not need to step on right-hand tread plate valve 13.The setting of left-hand tread plate valve can make chaufeur between 0% to 100%, effectively control tire propulsive effort in conjunction with tire propulsive effort in addition, prevents tyre skidding, reduces wear on tyres, effectively can use engine power like this, reduces oil consumption and accelerates rate of circulation.Parking Brake and running brake can be used as emergency braking use in addition, significantly increase brake system reliability and travel safety.
Right-hand tread plate valve (pilot-operated type brake pedal valve) 13 described in the present invention is dual circuit control, possesses pilot control function, principle of work is as follows: valve has two independently pressure outputs, independently can implement braking to the forward and backward drg of complete machine, if a road brake system wherein breaks down, normal work can be continued in an other road of valve; The feature of guide is that can export higher pressure by left threading valve 7 makes pressure switch 8 close in addition, pressure switch 8 is connected with emergency braking electromagnetic valve 12, emergency braking electromagnetic valve 12 obtains electric, the oil of brake activation valve group 11 flows to the PX mouth of right-hand tread plate valve 13 through PX mouth, right-hand tread plate valve core moves down, and now the P1 mouth of right-hand tread plate valve 13 communicates with B1 mouth, P2 mouth communicates with B2 mouth, forward and backward lock of controller, can realize emergency braking, guarantees complete machine traffic safety.
The principle of work of the Parking Brake 17 described in the present invention is as follows: Parking Brake is except the function with braking during standstill, can also use as accident brake, this drg is brake application by spring, the disc type brake of hydraulic pressure release, be arranged on the power intake of front driving axle, and can manual separation be realized, so that the movement of complete machine under engine off state.
The principle of work of complete machine brake system of the present invention is as follows: when complete machine needs emergency braking, two kinds of emergency braking forms can be adopted, the first: chaufeur presses lower parking electromagnetic valve 21 to emergency braking enforcing location, parking electromagnetic valve 21 power-off, spool return, the hydraulic oil of Parking Brake 17 inside, by the C mouth of brake activation valve group 11, flow back to fuel tank 1 through parking electromagnetic valve 21, Parking Brake 17, under spring thrust effect, implements emergency braking.The second: chaufeur steps on left-hand tread plate valve 7(fine motion function treadle valve when flooring), when pressure switch 8 reaches setting value, pressure switch 8 closes, and emergency braking electromagnetic valve 12 obtains electric, and the oil of brake activation valve group 11 flows to the PX mouth of right-hand tread plate valve 13 through PX mouth, right-hand tread plate valve core moves down, now the P1 mouth of right-hand tread plate valve 13 communicates with B1 mouth, and P2 mouth communicates with B2 mouth, forward and backward lock of controller, realize emergency braking, ensure that the travel safety of complete machine.During normal vehicle operation braking, chaufeur steps on right-hand tread plate valve 13(pilot-operated type brake pedal valve) 13, the B1 mouth of right-hand tread plate valve (pilot-operated type brake pedal valve) 13 and P1 mouth are connected, B2 mouth and P2 mouth are connected, propons energy storage 9, the hydraulic oil of back axle energy storage 10, through the P1 mouth of brake activation valve group 11, P2 mouth, flow to the P1 mouth of right-hand tread plate valve 13 respectively, P2 mouth, then the P1 mouth of right-hand tread plate valve 13 and B1 mouth communicate, P2 mouth and B2 mouth communicate, propons drg 16 is flow to through shuttle valve valve group 14, rear axle brake vi 15 is flow to through shuttle valve valve group 14, propons drg 16 and rear axle brake vi 15 respectively with propons brake disc and the locking of back axle brake disc, when chaufeur unclamps right-hand tread plate valve 13, the hydraulic oil of propons drg 16, gets back to the T mouth on right-hand tread plate valve 13 through shuttle valve valve group 14, then fuel tank 1 is flowed back to, the T mouth on right-hand tread plate valve 13 got back to by the hydraulic oil of rear axle brake vi 15 through shuttle valve valve group 14, then flow back to fuel tank 1, brake release.
Below with reference to Fig. 1, working process of the present invention is described in detail:
Before car load starts, stationary vehicle, battery isolator control is in closed condition.
Park brake switch is in parking position, parking electromagnetic valve 21 power-off, spool return, the hydraulic oil of Parking Brake 17 inside flows to the T mouth of brake activation valve group 11 through parking electromagnetic valve 21 by the C mouth of brake activation valve group 11, then the T mouth through brake activation valve group 11 flows back to fuel tank 1, Parking Brake 17 is under the effect of parking spring thrust, and implement parking, vehicle is in parked state.
Open car load battery isolator control, start the engine, gear type pump 3 is under the driving of engine power, and pressure oil output, to the P mouth of prefill valve 5, divides the A1 mouth, the A2 mouth that are clipped to brake activation valve group 11 oil-filled to propons energy storage 9, back axle energy storage 10 through the A1 mouth of prefill valve 5, A2 mouth.Before the pressure of propons energy storage 9, back axle energy storage 10 does not reach autobrake switch setting pressure, or in driving process, when the pressure of propons energy storage 9, back axle energy storage 10 is reduced to below the setting pressure of autobrake switch, the low alarm switch 20 of brake-pressure of brake activation valve group 11 closes, the braking low pressure alarming lamp flicker of instrument desk, prompting chaufeur checks.
Before vehicle travels, park brake switch is pressed to parking releasing position, parking electromagnetic valve 21 obtains electric, spool moves, oil in back axle energy storage 10 in brake activation valve group 11 flows to Parking Brake 17 through parking electromagnetic valve 21, the spring thrust in the oil pressure counter contained spring chamber of Parking Brake 17, braking during standstill is removed; In driving process, if the reliable pressure that braking during standstill pressure discharges lower than parking, the braking during standstill low pressure warning switch 18 of brake activation valve group C mouth closes, and the braking during standstill low pressure alarming lamp flicker of instrument desk, prompting chaufeur checks.
In vehicle travel process, chaufeur steps on right-hand tread plate valve 13, the B1 mouth of right-hand tread plate valve 13 and P1 mouth are connected, B2 mouth and P2 mouth are connected, propons energy storage 9, the hydraulic oil of back axle energy storage 10, through the P1 mouth of braking prefill valve group 11, P2 mouth, flow to the P1 mouth of right-hand tread plate valve 13 respectively, P2 mouth, then the P1 mouth of right-hand tread plate valve 13 and B1 mouth communicate, P2 mouth and B2 mouth communicate, propons drg 16 is flow to through shuttle valve valve group 14, rear axle brake vi 15 is flow to through shuttle valve valve group 14, propons drg 16 and rear axle brake vi 15 respectively with propons brake disc and the locking of back axle brake disc, chaufeur unclamps right-hand tread plate valve 13, the hydraulic oil of propons drg 16, the T mouth on right-hand tread plate valve 13 is flow to through shuttle valve valve group 14, then fuel tank 1 is flowed back to, the hydraulic oil of rear axle brake vi 15 flows to the T mouth on pilot-operated type brake pedal valve 13 through shuttle valve valve group 14, then fuel tank 1 is flowed back to, brake release.
In vehicle travel process, run into emergency situation, have two kinds of emergency braking forms to operate, the first: chaufeur presses lower parking electromagnetic valve 21 to emergency braking enforcing location, parking electromagnetic valve 21 power-off, spool return, the hydraulic oil of Parking Brake 17 inside, by the C mouth of brake activation valve group 11, fuel tank 1 is flowed back to through parking electromagnetic valve 21, Parking Brake 17 is under spring thrust effect, and the locking of braking during standstill dish, realizes emergency braking.Emergency situation is removed, and chaufeur is pressed lower parking electromagnetic valve and removed position to braking during standstill, and parking electromagnetic valve 21 obtains electric, and the C oral fluid force feed of brake activation valve group 11, through parking electromagnetic valve 21, flows back to fuel tank 1, and emergency braking is removed.The second: chaufeur steps on left-hand tread plate valve 7(fine motion function treadle valve when flooring), when pressure switch 8 reaches setting value, pressure switch 8 closes, emergency braking electromagnetic valve 12 obtains electric, hydraulic oil flows to the PX mouth of left-hand tread plate valve 13 by the PX mouth braking valve 11 processed, right-hand tread plate valve core moves down, at this moment the P1 mouth of brake activation valve group 11 and the B1 mouth of left-hand tread plate valve 13 are connected, P2 mouth and B2 mouth are connected, propons energy storage 9, the hydraulic oil of back axle energy storage 10, through the P1 mouth of brake activation valve group 11, P2 mouth, flow to the B1 mouth of left-hand tread plate valve 13 respectively, B2 mouth, through the B1 mouth of left-hand tread plate valve 13, B2 mouth flows to propons drg 16 and rear axle brake vi 15 respectively, propons drg 16 and rear axle brake vi 15 respectively with propons brake disc and the locking of back axle brake disc, shuttle valve valve group 14 closes simultaneously, the brake lamp of vehicle is lighted, to subsequent vehicle one warning, subsequent vehicle is needed to keep a failure-free operating range.Emergency situation is removed, and chaufeur unclamps left-hand tread plate valve 7, emergency braking electromagnetic valve 12 power-off, and the PX oral fluid force feed of brake activation valve group 11, through emergency braking electromagnetic valve 12, flows back to fuel tank 1; The hydraulic oil of propons drg 16, flows to T mouth by the B1 mouth of left-hand tread plate valve 13, gets back to fuel tank 1, rear axle brake vi 15 flow to T mouth by the B2 mouth of left-hand tread plate valve 13, get back to fuel tank 1, emergency braking remove.
When vehicle is bulldozed, the angle that chaufeur can carry out adjusting left-hand tread plate valve pedal according to the weight of perching knife incision soil ensures the propulsive effort of wheel.When the angle stepping on left-hand tread plate valve is larger, the pressure of output is larger, and it is longer that micro-motion oil cylinder valve rod stretches out, and change speed gear box valve rod retraction amount is comparatively large, and the moment of torsion of at this moment change speed gear box output is less, and wheel output drive strength is less, ensures that wheel is non-slip; When the angle stepping on left-hand tread plate valve is less, the pressure of output is less, and it is shorter that micro-motion oil cylinder valve rod stretches out, and change speed gear box valve rod retraction amount is less, and the moment of torsion of at this moment change speed gear box output is comparatively large, thus ensures that wheel has larger propulsive effort.When perching knife cut soil more shallow time, the propulsive effort that complete machine needs is less, at this moment to step on the angle of left-hand tread plate valve large for chaufeur, the pressure exported is large, it is longer that micro-motion oil cylinder valve rod stretches out, and change speed gear box valve rod retraction amount is large, and the moment of torsion that change speed gear box exports is less, wheel output drive strength is less, ensures that wheel is non-slip.Namely chaufeur is by the angle of adjustment left-hand tread plate valve, controls tire propulsive effort from 0% to 100%, can prevent tyre skidding by actv., reduces wear on tyres.When chaufeur steps on left-hand tread plate valve 7, hydraulic oil flows to the P3 mouth of left-hand tread plate valve 7 through the P1 mouth of brake activation valve group 11, P3 mouth through left-hand tread plate valve 7 flows to micro-motion oil cylinder 6, the hydraulic oil pushing change speed gear box valve rod of micro-motion oil cylinder 6, thus change speed gear box valve rod realizes retraction amount according to the angle stepping on left-hand tread plate valve 7, when chaufeur unclamps left-hand tread plate valve 7, micro-motion oil cylinder 6 pulls speed change valve rod to stretch out by spring return function, hydraulic oil in micro-motion oil cylinder flows to T mouth through the A3 mouth of left-hand tread plate valve 7 and gets back to fuel tank 1, fine motion function is removed, whole power of driving engine are directly sent to drive axle through change speed gear box.
When vehicle travels, change speed gear box locking can be realized according to need of work, namely left-hand tread plate valve 7 is in free state, whole power of driving engine directly can be sent to drive axle through change speed gear box, obtain better efficiency, effectively can use engine power like this, reduce oil consumption and accelerate rate of circulation.
Car load stops travelling, when entering quiescence, park brake switch is pressed to parking position, the hydraulic oil of Parking Brake 17 is by the C mouth of brake activation valve group 11, the T mouth flowing to brake activation valve group 11 through parking electromagnetic valve 21, T mouth through brake activation valve group 11 flows back to fuel tank 1, locking under the spring-force driven dual of Parking Brake 17, vehicle is in parked state.
Claims (3)
1. wheel bulldozer fine motion function and a hydraulic braking control system, is characterized in that: it comprises fuel tank, oil absorption filter, gear type pump, high pressure filter, prefill valve, micro-motion oil cylinder, left-hand tread plate valve, pressure switch, brake activation valve group, right-hand tread plate valve, shuttle valve valve group, rear axle brake vi, propons drg, Parking Brake; Described brake activation valve group is integrated form valve block, comprises propons energy storage, back axle energy storage, emergency braking electromagnetic valve, the low warning of parking pressure, automatic emergency brake switch, the low warning of brake-pressure, parking electromagnetic valve, the first energy storage blowoff valve, the second energy storage blowoff valve; Wherein, the oil inlet of described gear type pump is connected with fuel tank by oil absorption filter, and the oil outlet of gear type pump is connected with the P mouth of prefill valve by high pressure filter; The oil return T mouth of described prefill valve, O mouth connect fuel tank respectively, and the A1 mouth that A1 mouth connects brake activation valve group is connected with propons energy storage, and the A2 mouth that A2 mouth connects brake activation valve group is connected with back axle energy storage, and SW mouth connects the SW mouth of brake activation valve group; The P1 mouth of brake activation valve group connects the P1 mouth of right-hand tread plate valve, P2 mouth connects the P2 mouth of right-hand tread plate valve, PX mouth connects the PX mouth of right-hand tread plate valve, C mouth connects Parking Brake, KG1 mouth connects the low warning of brake-pressure, KGAA connects automatic emergency brake switch, and KG2 connects the low warning of parking pressure, and T mouth connects fuel tank; The P3 mouth of described left-hand tread plate valve connects the P1 mouth of brake activation valve group, and A3 mouth connects micro-motion oil cylinder and pressure switch, and T mouth connects fuel tank; The B1 mouth of described right-hand tread plate valve connects the B1 mouth of shuttle valve valve group and is connected with propons drg, and B2 mouth connects the B2 mouth of shuttle valve valve group and is connected with rear axle brake vi, and T mouth connects fuel tank; The E1 mouth of described emergency braking electromagnetic valve is connected with the SW mouth of brake activation valve group, KGAA mouth, KG1 mouth respectively, and the E2 mouth of emergency braking electromagnetic valve is connected with the T mouth of brake activation valve group, and the E3 mouth of emergency braking electromagnetic valve is connected with the PX mouth of brake activation valve group; The D1 mouth of described parking electromagnetic valve is connected with back axle energy storage, and the D2 mouth of parking electromagnetic valve is connected with the T mouth of brake activation valve group, and the D3 mouth of parking electromagnetic valve is connected with the C mouth of brake activation valve group; The F1 mouth of described first energy storage blowoff valve is connected with the A1 mouth of brake activation valve group, the corresponding interface of propons energy storage, the P1 mouth of brake activation valve group respectively, and the F2 mouth of the first energy storage blowoff valve is connected with the T mouth of brake activation valve group; The H1 mouth of described second energy storage blowoff valve is connected with the A2 mouth of brake activation valve group, the P mouth of brake activation valve group respectively, and the second energy storage blowoff valve H2 mouth is connected with the T mouth of brake activation valve group.
2. wheel bulldozer fine motion function according to claim 1 and hydraulic braking control system, is characterized in that: between the P mouth of described prefill valve and 0 mouthful, safety valve is housed.
3. wheel bulldozer fine motion function according to claim 1 and hydraulic braking control system, is characterized in that: described shuttle valve valve group is the integrated form valve block being integrated with filter core, check valve, pressure switch.
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| CN105667477A (en) * | 2016-04-13 | 2016-06-15 | 武汉科技大学 | Wire driven hydraulic parking braking system for full-wheel steering electric-wheel car |
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| CN109334649A (en) * | 2018-11-20 | 2019-02-15 | 徐工集团工程机械有限公司 | Rail convertible car braking system and rail convertible car |
| CN109334649B (en) * | 2018-11-20 | 2024-04-30 | 江苏徐工工程机械研究院有限公司 | Brake system of dual-purpose rail vehicle and dual-purpose rail vehicle |
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| CN110566521A (en) * | 2019-08-23 | 2019-12-13 | 安徽合力股份有限公司 | automatic explosion-proof fork truck hydraulic system of control |
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