CN104058003B - A kind of hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape - Google Patents

A kind of hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape Download PDF

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CN104058003B
CN104058003B CN201410269478.4A CN201410269478A CN104058003B CN 104058003 B CN104058003 B CN 104058003B CN 201410269478 A CN201410269478 A CN 201410269478A CN 104058003 B CN104058003 B CN 104058003B
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oil cylinder
way
mouth
wheel
rod chamber
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CN104058003A (en
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张巍
杨崇光
吴良柱
贺华
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Ningbo Ruyi JSCL
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Ningbo Ruyi JSCL
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Abstract

The invention discloses a kind of hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape, the A mouth of the first three position four-way electromagnetic valve is connected with the rodless cavity of left steering oil cylinder, the rod chamber of left steering oil cylinder is connected with the rodless cavity of right steering oil cylinder, the rod chamber of right steering oil cylinder is connected with the B mouth of the first three position four-way electromagnetic valve, between the rodless cavity and the rod chamber of right steering oil cylinder of left steering oil cylinder, be provided with bidirectional hydraulic lock; The A mouth of the second three position four-way electromagnetic valve divides two-way, be connected with the rodless cavity of right back oil cylinder with left back oil cylinder respectively, the B mouth of the second three position four-way electromagnetic valve divides two-way, be connected with the rod chamber of right back oil cylinder with left back oil cylinder respectively, between the rodless cavity and rod chamber of left back oil cylinder and right back oil cylinder, be provided with bidirectional hydraulic lock respectively simultaneously.The invention provides a kind of good reliability, cost low, easy to maintenance travel for four-wheel four direction driving vehicle portraitlandscape the hydraulic efficiency pressure system switched.

Description

A kind of hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape
Technical field
The present invention relates to one and turn to switching hydraulic control system, particularly a kind of hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape.
Background technology
Four-wheel four direction driving vehicle is different from conventional 4Wdvehicle, four-wheel four direction driving vehicle has longitudinal driving and cross running function, therefore, the steering hardware of four-wheel four direction driving vehicle is meeting longitudinal driving and is walking crosswise outside the function of traveling turning, also need to have the function realizing being switched by longitudinal driving state to cross running state and being switched to longitudinal driving state by cross running state, therefore the stability of four-wheel four direction driving vehicle in longitudinal driving and cross running state will be ensured, turn to switched system must have certain reliability.
Relative to the steering hardware of the 4Wdvehicle of routine, technical requirements and the technology content of the steering swivel system of four-wheel four direction driving vehicle are all higher, and at present, domestic and international fertile producer is very little.For the steering swivel system of existing four-wheel four direction driving vehicle, manufacturer generally adopts the mode of computer programming to control four motor steerings, because the fault occurrence rate of motor and control panel is very large, make the poor reliability of steering swivel system, and easily damage, meanwhile, use four steer motor and four cover turn to control panel costly, also result in vehicle purchase car cost and service expenditure improves greatly.
Summary of the invention
The technical problem to be solved in the present invention is the present situation for prior art, provides the hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape that a kind of good reliability, cost are low, easy to maintenance.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape, comprise and control the left steering oil cylinder that vehicle front left wheel is rotated and the right steering oil cylinder rotated with control vehicle right front wheel, it is characterized in that: also comprise a left side four station two-way cylinder be arranged between vehicle front left wheel and rear left wheel, be arranged on the right side four station two-way cylinder between vehicle right front wheel and right rear wheel, oil pump, hydraulic steering gear, first two-position four-way solenoid valve, second two-position four-way solenoid valve, first three position four-way electromagnetic valve and the second three position four-way electromagnetic valve, left four station two-way cylinders comprise left front oil cylinder and left back oil cylinder, right four station two-way cylinders comprise right front oil cylinder and right back oil cylinder, the oil outlet of oil pump is communicated with the P mouth of the second three position four-way electromagnetic valve, the T mouth of the second three position four-way electromagnetic valve is communicated with the P mouth of the second two-position four-way solenoid valve, the T mouth of the second two-position four-way solenoid valve is communicated with the P mouth of the first three position four-way electromagnetic valve, the T mouth of the first three position four-way electromagnetic valve is communicated with the P mouth of hydraulic steering gear, and the T mouth of hydraulic steering gear is communicated with fuel tank, the A mouth of hydraulic steering gear is connected with T mouth with the P mouth of the first two-position four-way solenoid valve respectively with B mouth, the A mouth of the first two-position four-way solenoid valve is connected with the A mouth of the first three position four-way electromagnetic valve, and the B mouth of the first two-position four-way solenoid valve is connected with the B mouth of the first three position four-way electromagnetic valve, the A mouth of the first three position four-way electromagnetic valve is connected with the rodless cavity of left steering oil cylinder, the rod chamber of left steering oil cylinder is connected with the rodless cavity of right steering oil cylinder, the rod chamber of right steering oil cylinder is connected with the B mouth of the first three position four-way electromagnetic valve, between the rodless cavity and the rod chamber of right steering oil cylinder of left steering oil cylinder, be provided with bidirectional hydraulic lock, the A mouth of the second three position four-way electromagnetic valve divides two-way, be connected with the rodless cavity of right back oil cylinder with left back oil cylinder respectively, the B mouth of the second three position four-way electromagnetic valve divides two-way, be connected with the rod chamber of right back oil cylinder with left back oil cylinder respectively, between the rodless cavity and rod chamber of left back oil cylinder and right back oil cylinder, be provided with bidirectional hydraulic lock respectively simultaneously, the A mouth of the second two-position four-way solenoid valve divides two-way, be connected with the rod chamber of right front oil cylinder with left front oil cylinder respectively, the B mouth of the second two-position four-way solenoid valve divides two-way, be connected with the rodless cavity of right front oil cylinder with left front oil cylinder respectively, between the rodless cavity and rod chamber of left front oil cylinder and right front oil cylinder, be provided with bidirectional hydraulic lock respectively simultaneously.
As improvement, also comprise the 3rd two-position four-way solenoid valve, the P mouth of the 3rd two-position four-way solenoid valve is connected with the A mouth of hydraulic steering gear, the B mouth of the 3rd two-position four-way solenoid valve is connected with the T mouth of hydraulic steering gear, the A mouth of the 3rd two-position four-way solenoid valve is connected with the first actuator port of cross running hydraulic efficiency pressure system, the B mouth of the 3rd two-position four-way solenoid valve is connected with the second actuator port of cross running hydrostatic steering system, utilize hydraulic steering gear simultaneously as the steering power source of cross running, improve the compactedness of system.
Improve again, be provided with pilot overflow valve in the bypass of oil pump oil outlet, realize overvoltage protection.
Improve again, described cross running hydrostatic steering system comprises the first one way sequence valve and the second one way sequence valve, through a point two-way after hydraulic oil flows into from the first actuator port of this cross running hydrostatic steering system, connect after the first one way sequence valve and communicate with the rod chamber of left back oil cylinder in one road, the rodless cavity of left back oil cylinder communicates with the rodless cavity oil circuit of right front oil cylinder, the rod chamber of right front oil cylinder is communicated with the second actuator port of this cross running hydrostatic steering system, the rod chamber of the left front oil cylinder of another Lu Zeyu communicates, the rodless cavity of left front oil cylinder communicates with the rodless cavity oil circuit of right back oil cylinder, the rod chamber of right back oil cylinder is connected after the second one way sequence valve and is communicated with the second actuator port of this cross running hydrostatic steering system.In cross running process, when vehicle right-hand corner, pressure oil flows into from the first actuator port, now, due to the partition of the first one way sequence valve, hydraulic oil can only flow into the rod chamber of the left front oil cylinder of left four station two-way cylinders, the piston rod of left front oil cylinder is retracted, promotion rear left wheel rotates counterclockwise, simultaneously, the hydraulic oil of the rod chamber of left front oil cylinder enters the rodless cavity of right back oil cylinder, the piston rod of right back oil cylinder stretches out, promotion right rear wheel rotates counterclockwise, because the piston rod of left front oil cylinder and right back oil cylinder is synchronization action, therefore, the retraction amount of the piston rod of left front oil cylinder is equal with the overhang of the piston rod of right back oil cylinder, the corner of rear left wheel is less than the corner of right rear wheel, the axes intersect achieving rear left wheel and right rear wheel in front left wheel and right front wheel line of centers line on, along with the sustainable supply of pressure oil, when the piston rod of left front oil cylinder and the casing wall of left front oil cylinder offset, the pressure of the first actuator port raises, first one way sequence valve is opened, pressure oil enters the rod chamber of left back oil cylinder, the piston rod promoting left back oil cylinder is retracted, rear left wheel is made to continue to rotate counterclockwise, simultaneously, because the rodless cavity of left back oil cylinder is connected with the rodless cavity oil circuit of right front oil cylinder, in the process that the piston rod of left back oil cylinder is retracted, the rodless cavity pressure oil of left back oil cylinder enters in the rodless cavity of right front oil cylinder, thus the piston rod promoting right front oil cylinder stretches out, make to promote right rear wheel to continue to rotate counterclockwise simultaneously, similarly, the shortening amount of the piston rod of left back oil cylinder is equal with the elongation of the piston rod of right front oil cylinder, still meet the action request of vehicle turns right, in like manner, when vehicle is turned left, pressure oil flows into from the second actuator port, flows back to from the first actuator port, and its principle is identical with right-hand corner.Therefore, this cross running hydrostatic steering system is adopted to achieve significantly left and right turn function in the driving vehicle cross running process of four-wheel four direction.
Improve again, between the rod chamber and the rod chamber of right front oil cylinder of described left back oil cylinder, be provided with bidirectional hydraulic lock, between the rod chamber and the rod chamber of left front oil cylinder of right back oil cylinder, be provided with bidirectional hydraulic lock, prevent the improper play of hydraulic cylinder piston rod.
Improve again, described first one way sequence valve and the second one way sequence valve comprise a check valve and the two position three way directional control valve in parallel with this check valve respectively, the T mouth connected tank of this two position three way directional control valve, and control commutation by the pressure of P mouth, check valve wherein in parallel is convenient to hydraulic oil and is back to fuel tank, simultaneously, utilize the pressure of P mouth to control the commutation of two position three way directional control valve, achieve the function of sequence valve, when P mouth pressure does not reach the force value of setting, the left position of two position three way directional control valve is enable, hydraulic oil can not pass through from this two position three way directional control valve, when P mouth pressure rises to the force value of setting, two position three way directional control valve realizes commutation, make right position enable, thus hydraulic oil is by this two position three way directional control valve, so just achieve the function of sequence valve.
Compared with prior art, owing to the invention has the advantages that: according to the requirement of four-wheel four direction driving vehicle, when longitudinal driving, the left and right front oil cylinder of four station two-way cylinders and the piston rod of rear oil cylinder are all retracted, four wheel correspondences synchronously turn to, left and right four station two-way cylinders use as connecting rod, when cross running, the axis of front left wheel and right front wheel is needed to align in the longitudinal direction, and keep maintaining static in cross running process, left and right four station two-way cylinders use as fork, longitudinally in the handoff procedure of transverse direction, first, 2DT is energized, first two-position four-way solenoid valve changes into closed condition by normally open, then, 4DT is energized, the first left position of three position four-way electromagnetic valve is enable, the rodless cavity promotion piston rod that pressure oil enters left steering oil cylinder ejects, because the rodless cavity of the rod chamber of left steering oil cylinder and right steering oil cylinder is together in series, the pressure oil of left steering cylinder rod chamber enters the rodless cavity of right steering oil cylinder, the piston rod of right steering oil cylinder is released, left, the piston rod of right steering oil cylinder promotes front left wheel simultaneously and right front wheel is rotated, now left, right four station two-way cylinders use as connecting rod, front left wheel and right front wheel drive rear left wheel and right rear wheel to rotate respectively, left, right steering oil cylinder front left wheel and right front wheel is push-jump put in place after, front left wheel and right front wheel are at horizontal alignment, left, right steering oil cylinder is locked by bidirectional hydraulic lock, now front left wheel and right front wheel are in stationary state, then, 7DT is energized, the second left position of three position four-way electromagnetic valve is enable, left, the right left back oil cylinder of four station two-way cylinders and the rodless cavity oil-feed of right back oil cylinder, the piston rod of left back oil cylinder and right back oil cylinder promotes rear left wheel and right rear wheel is rotated further, after piston rod puts in place, now rear left wheel and right rear wheel are laterally also aligning, thus get back to the initial condition of cross running, laterally in the handoff procedure of longitudinal direction, first, 2DT is energized, the right normally open of first two-position four-way solenoid valve changes into closed condition, then, 3DT is energized, the first right position of three position four-way electromagnetic valve is enable, the rod chamber that pressure oil enters right steering oil cylinder promotes piston rod retraction, in like manner due to a left side, the synchronization action of right steering oil cylinder, left, the piston rod of right steering oil cylinder is retracted simultaneously, front left wheel and right front wheel is pulled to rotate, after putting in place, front left wheel and right front wheel are longitudinally aligning, then 5DT energising, the second left position of two-position four-way solenoid valve is enable, pressure oil enters a left side, the right left front oil cylinder of four station two-way cylinders and the rod chamber of right front oil cylinder, two secondary piston bars are all retracted, then, 6DT is energized, the second right position of three position four-way electromagnetic valve is enable, left, the right left back oil cylinder of four station two-way cylinders and the rod chamber oil-feed of right back oil cylinder, after two, the piston rod of oil cylinder is all retracted and is put in place, rear left wheel and right rear wheel is pulled to rotate, now rear left wheel and right rear wheel are longitudinally aligning, thus get back to longitudinal driving state, the present invention adopts hydraulic control system to achieve four-wheel four direction driving vehicle portraitlandscape and travels switching, compare automatically controlled mode, there is better reliability, simultaneously manufacture and maintenance cost low, easy to maintenance.
Accompanying drawing explanation
Fig. 1 is the hydraulic principle figure that in the embodiment of the present invention, four-wheel four direction driving vehicle portraitlandscape travels the hydraulic efficiency pressure system switched;
Fig. 2 is the structural representation that in the embodiment of the present invention, four-wheel four direction driving vehicle steering hardware longitudinal driving turns to;
Fig. 3 is the structural representation that in the embodiment of the present invention, four-wheel four direction driving vehicle steering hardware cross running turns to;
Fig. 4 is the initial condition schematic diagram that in the embodiment of the present invention, four-wheel four direction driving vehicle switches to longitudinally latter two four stations two-way cylinder and four wheels from transverse direction;
Fig. 5 is the initial condition schematic diagram that in the embodiment of the present invention, four-wheel four direction driving vehicle switches to laterally latter two four stations two-way cylinder and four wheels from longitudinal direction;
Fig. 6 is driving vehicle initial condition schematic diagram of two four station two-way cylinders and four wheels during right-hand corner in cross running state in four-wheel four direction in the embodiment of the present invention;
Fig. 7 is driving vehicle initial condition schematic diagram of two four station two-way cylinders and four wheels during turnon left in cross running state in four-wheel four direction in the embodiment of the present invention;
Wheel condition schematic diagram when four-wheel four direction driving vehicle steering hardware longitudinal driving turns in Fig. 8 embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
First, brief description is done to the steering hardware of the four-wheel four direction driving vehicle that the hydraulic efficiency pressure system of four-wheel in the present embodiment four direction driving vehicle portraitlandscape traveling switching is applied to, the steering hardware of this four-wheel four direction driving vehicle comprises frame 1, before this frame 1, after, left, right four direction intersection is respectively arranged with front left wheel 22, right front wheel 21, rear left wheel 23 and right rear wheel 24, in this front left wheel 22, right front wheel 21, rear left wheel 23 and right rear wheel 24 are hinged with left front spindle arm 32 successively, right front spindle arm 31, left back spindle arm 33 and right back spindle arm 34, left four station two-way cylinders 42 are provided with between left front spindle arm 32 and left back spindle arm 33, right four station two-way cylinders 41 are provided with between right front spindle arm 31 and right back spindle arm 34, left steering oil cylinder 52 and right steering oil cylinder 51 is disposed with on the side of front left wheel 22 and right front wheel 21, left steering oil cylinder 52 is connected with immediate spindle arm with right steering oil cylinder 51 one end, the other end is connected with frame 1.When longitudinal direction of car travels, left wheel 22,23 and right wheel 21,24 synchronous axial system, and the same point of the axes intersect of front left wheel 22, right front wheel 21, rear left wheel 23 and right rear wheel 24 on the diad of left wheel 22,21 and right wheel 23,24; When lateral direction of car travels, front vehicle wheel 22,21 is fixed, and rear wheel 23,24 rotates, and rear wheel 23,24 is when left-right rotation, the axis of two rear wheels 23,24 meet at front vehicle wheel 22,21 line of centers line on, as shown in Figure 2,3.
As shown in Fig. 1 to 8, the hydraulic efficiency pressure system travelling switching for four-wheel four direction driving vehicle portraitlandscape in this enforcement, comprise the left steering oil cylinder 52 controlling vehicle front left wheel 22 and rotate, the right steering oil cylinder 51 rotated with control vehicle right front wheel 21, be arranged on a left side four station two-way cylinder 42 between vehicle front left wheel 22 and rear left wheel 23, be arranged on the right side four station two-way cylinder 41 between vehicle right front wheel 21 and right rear wheel 24, oil pump 8, hydraulic steering gear 9, first two-position four-way solenoid valve 61, second two-position four-way solenoid valve 62, 3rd two-position four-way solenoid valve 63, first three position four-way electromagnetic valve 71 and the second three position four-way electromagnetic valve 72, pilot overflow valve 10, these left four station two-way cylinders 42 comprise left front oil cylinder 421 and left back oil cylinder 422, right four station two-way cylinders 41 comprise right front oil cylinder 411 and right back oil cylinder 412.
Wherein, the oil outlet of oil pump 8 is communicated with the P mouth of the second three position four-way electromagnetic valve 72, the T mouth of the second three position four-way electromagnetic valve 72 is communicated with the P mouth of the second two-position four-way solenoid valve 62, the T mouth of the second two-position four-way solenoid valve 62 is communicated with the P mouth of the first three position four-way electromagnetic valve 71, the T mouth of the first three position four-way electromagnetic valve 71 is communicated with the P mouth of hydraulic steering gear 9, and the T mouth of hydraulic steering gear 9 is communicated with fuel tank; The A mouth of hydraulic steering gear 9 is connected with T mouth with the P mouth of the first two-position four-way solenoid valve 61 respectively with B mouth, the A mouth of the first two-position four-way solenoid valve 61 is connected with the A mouth of the first three position four-way electromagnetic valve 71, and the B mouth of the first two-position four-way solenoid valve 61 is connected with the B mouth of the first three position four-way electromagnetic valve 71; The A mouth of the first three position four-way electromagnetic valve 71 is connected with the rodless cavity of left steering oil cylinder 52, the rod chamber of left steering oil cylinder 52 is connected with the rodless cavity of right steering oil cylinder 51, the rod chamber of right steering oil cylinder 51 is connected with the B mouth of the first three position four-way electromagnetic valve 71, between the rodless cavity and the rod chamber of right steering oil cylinder 51 of left steering oil cylinder 52, be provided with bidirectional hydraulic lock; The A mouth of the second three position four-way electromagnetic valve 72 divides two-way, be connected with the rodless cavity of right back oil cylinder 412 with left back oil cylinder 422 respectively, the B mouth of the second three position four-way electromagnetic valve 72 divides two-way, be connected with the rod chamber of right back oil cylinder 412 with left back oil cylinder 422 respectively, between the rodless cavity and rod chamber of left back oil cylinder 422 and right back oil cylinder 412, be provided with bidirectional hydraulic lock respectively simultaneously; The A mouth of the second two-position four-way solenoid valve 62 divides two-way, be connected with the rod chamber of right front oil cylinder 411 with left front oil cylinder 421 respectively, the B mouth of the second two-position four-way solenoid valve 62 divides two-way, be connected with the rodless cavity of right front oil cylinder 411 with left front oil cylinder 421 respectively, between the rodless cavity and rod chamber of left front oil cylinder 421 and right front oil cylinder 411, be provided with bidirectional hydraulic lock respectively simultaneously.
In addition, the P mouth of the 3rd two-position four-way solenoid valve 63 is connected with the A mouth of hydraulic steering gear 9, the T mouth of the 3rd two-position four-way solenoid valve 63 is connected with the B mouth of hydraulic steering gear 9, the A mouth of the 3rd two-position four-way solenoid valve 63 is connected with the first actuator port of cross running hydrostatic steering system, the B mouth of the 3rd two-position four-way solenoid valve 63 is connected with the second actuator port of cross running hydraulic efficiency pressure system, utilize hydraulic steering gear 9 simultaneously as the steering power source of cross running, improve the compactedness of system.
In addition, be provided with pilot overflow valve 10 in the bypass of oil pump 8 oil outlet, realize overvoltage protection.
Simultaneously, described cross running hydrostatic steering system comprises the first one way sequence valve 13 and the second one way sequence valve 14, through a point two-way after hydraulic oil flows into from the first actuator port of this cross running hydrostatic steering system, connecting in one road, the first one way sequence valve 13 is rear to communicate with the rod chamber of left back oil cylinder 422, the rodless cavity of left back oil cylinder 422 communicates with the rodless cavity oil circuit of right front oil cylinder 411, the rod chamber of right front oil cylinder 411 is communicated with the second actuator port of this cross running hydrostatic steering system, the rod chamber of the left front oil cylinder 421 of another Lu Zeyu communicates, the rodless cavity of left front oil cylinder 421 communicates with the rodless cavity oil circuit of right back oil cylinder 412, the rod chamber of right back oil cylinder 412 is connected after the second one way sequence valve 14 and is communicated with the second actuator port of this cross running hydrostatic steering system.In cross running process, when vehicle right-hand corner, pressure oil flows into from the first actuator port, now, due to the partition of the first one way sequence valve 13, hydraulic oil can only flow into the rod chamber of the left front oil cylinder 421 of left four station two-way cylinders 42, the piston rod of left front oil cylinder 421 is retracted, promote rear left wheel 23 to rotate counterclockwise, simultaneously, the hydraulic oil of the rod chamber of left front oil cylinder 421 enters the rodless cavity of right back oil cylinder 412, the piston rod of right back oil cylinder 412 stretches out, promote right rear wheel 24 to rotate counterclockwise, because the piston rod of left front oil cylinder 421 and right back oil cylinder 412 is synchronization actions, therefore, the retraction amount of the piston rod of left front oil cylinder 421 is equal with the overhang of the piston rod of right back oil cylinder 412, the corner of rear left wheel 23 is less than the corner of right rear wheel 24, the axes intersect achieving rear left wheel 23 and right rear wheel 24 in front left wheel 22 and right front wheel 21 line of centers line on, along with the sustainable supply of pressure oil, when the piston rod of left front oil cylinder 421 and the casing wall of left front oil cylinder 421 offset, the pressure of the first actuator port raises, first one way sequence valve 13 is opened, pressure oil enters the rod chamber of left back oil cylinder 422, the piston rod promoting left back oil cylinder 422 is retracted, rear left wheel 23 is made to continue to rotate counterclockwise, simultaneously, because the rodless cavity of left back oil cylinder 422 is connected with the rodless cavity oil circuit of right front oil cylinder 411, in the process that the piston rod of left back oil cylinder 422 is retracted, the rodless cavity pressure oil of left back oil cylinder 422 enters in the rodless cavity of right front oil cylinder 411, thus the piston rod promoting right front oil cylinder 411 stretches out, make to promote right rear wheel 24 to continue to rotate counterclockwise simultaneously, similarly, the shortening amount of the piston rod of left back oil cylinder 422 is equal with the elongation of the piston rod of right front oil cylinder 411, still meet the action request of vehicle turns right, in like manner, when vehicle is turned left, pressure oil flows into from the second actuator port, flows back to from the first actuator port, and its principle is identical with right-hand corner.Therefore, this cross running hydrostatic steering system is adopted to achieve significantly left and right turn function in the driving vehicle cross running process of four-wheel four direction.
In order to prevent the improper play of hydraulic cylinder piston rod, between the rod chamber and the rod chamber of right front oil cylinder 411 of left back oil cylinder 422, be provided with bidirectional hydraulic lock, between the rod chamber and the rod chamber of left front oil cylinder 421 of right back oil cylinder 412, be provided with bidirectional hydraulic lock.
In addition, the first one way sequence valve 13 and the second one way sequence valve 14 comprise a check valve and the two position three way directional control valve in parallel with this check valve respectively, the T mouth connected tank of this two position three way directional control valve, and control commutation by the pressure of P mouth.Be specially the first one way sequence valve 13 and comprise the first check valve 131 and first two position three way directional control valve 132 in parallel with the first check valve 131, the T mouth connected tank of this first two position three way directional control valve 132, and control commutation by the pressure of the P mouth of the first two position three way directional control valve 132, wherein, first check valve 131 in parallel is convenient to hydraulic oil and is back to fuel tank, in addition, the pressure of the P mouth of the first two position three way directional control valve 132 is utilized to control the commutation of the first two position three way directional control valve 132, realize the function of sequence valve, when the P mouth pressure of the first two position three way directional control valve 132 does not reach the force value of setting, the first left position of two position three way directional control valve 132 is enable, hydraulic oil can not pass through from this first two position three way directional control valve 132, when the P mouth pressure of the first two position three way directional control valve 132 rises to the force value of setting, first two position three way directional control valve 132 realizes commutation, make right position enable, thus hydraulic oil is by this first two position three way directional control valve 132, so just achieve the function of sequence valve, in like manner, the second one way sequence valve 14 comprises the second check valve 141 and second two position three way directional control valve 142 in parallel with this second check valve 141, and this second one way sequence valve 14 has identical oil channel structures with the first one way sequence valve 13, is not repeated at this.
Following according to electromagnet action schedule, as shown in table 1, and by reference to the accompanying drawings the principle of work travelling the hydraulic efficiency pressure system switched for four-wheel four direction driving vehicle portraitlandscape is further described.
Table 1, electromagnet action schedule
According to the requirement of four-wheel four direction driving vehicle, when longitudinal driving, the piston rod of left front oil cylinder 421, left back oil cylinder 422, right front oil cylinder 411 and right back oil cylinder 412 is all retracted, left and right four station two-way cylinders 42,41 use as connecting rod, by being arranged on left steering oil cylinder 52 in frame 1 and right steering oil cylinder 51 in addition, realize four wheel correspondences synchronously to turn to, in order to meet the requirement of the same point of axes intersect on the diad of left wheel 22,23 and right wheel 21,24 of four wheels, as shown in Figure 8; When cross running, the axis of front left wheel 22 and right front wheel 21 is needed to align in the longitudinal direction and fix, left and right four station two-way cylinders 42,41 use as fork, rear wheel 23,24 rotates, in order to meet when rear wheel 23,24 left-right rotation, the axis of two rear wheels 23,24 meet at front vehicle wheel 22,21 line of centers line on requirement.
When longitudinal driving state, left, right four station two-way cylinders 42, the piston rod of 41 is in all retracts and locks, use as connecting rod, when longitudinal driving left and right turn, left steering oil cylinder 52 or right steering oil cylinder 51 oil-feed, because the rod chamber of left steering oil cylinder 52 is set to equal with the rodless cavity sectional area of right steering oil cylinder 51, the rod chamber of left steering oil cylinder 52 and the rodless cavity of right steering oil cylinder 51 are cascaded by oil circuit simultaneously, ensure that left steering oil cylinder 52 and right steering oil cylinder 51 piston rod synchronization action, make the corner of front left wheel flutter 22 and front right wheel flutter 21 equal, simultaneously, by two four station two-way cylinders 41, the connecting rod effect of 42, the rotation of front left wheel flutter 22 and front right wheel flutter 21 is passed to rear left wheel flutter 23 and rear right wheel flutter 24, thus meet left steering wheel 22, 23 and right steering wheel 21, the corner correspondent equal of 24, four of wheel flutter axis are made to intersect at left steering wheel 22, 23 and right steering wheel 21, on the diad of 24, meet the requirement that longitudinal direction of car travels, as shown in Figure 4.
Longitudinal driving state is to the switching of cross running state, first, 2DT is energized, first two-position four-way solenoid valve 61 changes into closed condition by normally open, then, 4DT is energized, the first left position of three position four-way electromagnetic valve 71 is enable, pressure oil enters the rodless cavity of left steering oil cylinder 52, promotion piston rod ejects, because the rodless cavity of the rod chamber of left steering oil cylinder 52 and right steering oil cylinder 51 is together in series, the pressure oil of left steering oil cylinder 52 rod chamber enters the rodless cavity of right steering oil cylinder 51, the piston rod of right steering oil cylinder 51 is released, left, right steering oil cylinder 52, the piston rod of 51 promotes front left wheel 22 simultaneously and right front wheel 21 is rotated, now left, right four station two-way cylinders 42, 41 use as connecting rod, front left wheel 22 and right front wheel 21 drive rear left wheel 23 and right rear wheel 24 to rotate respectively, left, right steering oil cylinder 52, 51 front left wheel 22 and right front wheel 21 is push-jump put in place after, front left wheel 22 and right front wheel 21 are at horizontal alignment, left, right steering oil cylinder 52, 51 are locked by bidirectional hydraulic lock, now front left wheel 22 and right front wheel 21 are in stationary state, then, 7DT is energized, the second left position of three position four-way electromagnetic valve 72 is enable, the rodless cavity oil-feed of left back oil cylinder 422 and right back oil cylinder 412, the piston rod of left back oil cylinder 422 and right back oil cylinder 412 promotes rear left wheel 23 and right rear wheel 24 is rotated further, after piston rod puts in place, now rear left wheel 23 and right rear wheel 24 are laterally also aligning, thus get back to the initial condition of cross running.
During the initial condition of cross running, left, right four station two-way cylinders 42, the state of the piston rod of 41, as shown in Figure 5, in cross running process, 1DT is energized, the 3rd right position of two-position four-way solenoid valve 63 is enable, hydraulic steering gear 9 is the first actuator port and the second actuator port fuel feeding of cross running hydrostatic steering system, when right-hand corner, the rod chamber of left back oil cylinder 422 and the synchronous oil-feed of rodless cavity of right front oil cylinder 411, while the piston rod compression of left back oil cylinder 422, the piston rod of right front oil cylinder 411 extends, and amount of compression is equal with elongation, thus synchronous drive rear left wheel 23 and right rear wheel 24 simultaneously right-hand turning to, as shown in Figure 6, when turnon left, the rod chamber of right back oil cylinder 412 and the synchronous oil-feed of rodless cavity of left front oil cylinder 421, while the piston rod compression of right back oil cylinder 412, the piston rod of left front oil cylinder 421 extends, and amount of compression is equal with elongation, thus synchronous drive rear left wheel 23 and right rear wheel 24 simultaneously left-handed turning to, as shown in Figure 7.
Cross running state is to the switching of longitudinal driving state, first, 2DT is energized, the right normally open of first two-position four-way solenoid valve 61 changes into closed condition, then, 3DT is energized, the first right position of three position four-way electromagnetic valve 71 is enable, the rod chamber that pressure oil enters right steering oil cylinder 51 promotes piston rod retraction, in like manner due to a left side, right steering oil cylinder 52, the synchronization action of 51, left, right steering oil cylinder 52, the piston rod of 51 is retracted simultaneously, front left wheel 22 and right front wheel 21 is pulled to rotate, after putting in place, front left wheel 22 and right front wheel 21 are longitudinally aligning, then 5DT energising, the second left position of two-position four-way solenoid valve 72 is enable, pressure oil enters the rod chamber of left front oil cylinder 421 and right front oil cylinder 411, two secondary piston bars are all retracted, then, 6DT is energized, the second right position of three position four-way electromagnetic valve 72 is enable, the rod chamber oil-feed of left back oil cylinder 422 and right back oil cylinder 412, after two, the piston rod of oil cylinder is all retracted and is put in place, rear left wheel 23 and right rear wheel 24 is pulled to rotate, now rear left wheel 23 and right rear wheel 24 are longitudinally aligning, thus get back to longitudinal driving state.
To sum up, the present invention adopts hydraulic control system to achieve four-wheel four direction driving vehicle portraitlandscape and travels and switch, and compares automatically controlled mode, has better reliability, manufacture simultaneously and maintenance cost low, easy to maintenance.

Claims (6)

1. one kind travels the hydraulic efficiency pressure system switched for four-wheel four direction driving vehicle portraitlandscape, comprise and control the left steering oil cylinder that vehicle front left wheel is rotated and the right steering oil cylinder rotated with control vehicle right front wheel, it is characterized in that: also comprise a left side four station two-way cylinder be arranged between vehicle front left wheel and rear left wheel, be arranged on the right side four station two-way cylinder between vehicle right front wheel and right rear wheel, oil pump, hydraulic steering gear, first two-position four-way solenoid valve, second two-position four-way solenoid valve, first three position four-way electromagnetic valve and the second three position four-way electromagnetic valve, left four station two-way cylinders comprise left front oil cylinder and left back oil cylinder, right four station two-way cylinders comprise right front oil cylinder and right back oil cylinder, the oil outlet of oil pump is communicated with the P mouth of the second three position four-way electromagnetic valve, the T mouth of the second three position four-way electromagnetic valve is communicated with the P mouth of the second two-position four-way solenoid valve, the T mouth of the second two-position four-way solenoid valve is communicated with the P mouth of the first three position four-way electromagnetic valve, the T mouth of the first three position four-way electromagnetic valve is communicated with the P mouth of hydraulic steering gear, and the T mouth of hydraulic steering gear is communicated with fuel tank, the A mouth of hydraulic steering gear is connected with T mouth with the P mouth of the first two-position four-way solenoid valve respectively with B mouth, the A mouth of the first two-position four-way solenoid valve is connected with the A mouth of the first three position four-way electromagnetic valve, and the B mouth of the first two-position four-way solenoid valve is connected with the B mouth of the first three position four-way electromagnetic valve, the A mouth of the first three position four-way electromagnetic valve is connected with the rodless cavity of left steering oil cylinder, the rod chamber of left steering oil cylinder is connected with the rodless cavity of right steering oil cylinder, the rod chamber of right steering oil cylinder is connected with the B mouth of the first three position four-way electromagnetic valve, between the rodless cavity and the rod chamber of right steering oil cylinder of left steering oil cylinder, be provided with bidirectional hydraulic lock, the A mouth of the second three position four-way electromagnetic valve divides two-way, be connected with the rodless cavity of right back oil cylinder with left back oil cylinder respectively, the B mouth of the second three position four-way electromagnetic valve divides two-way, be connected with the rod chamber of right back oil cylinder with left back oil cylinder respectively, between the rodless cavity and rod chamber of left back oil cylinder and right back oil cylinder, be provided with bidirectional hydraulic lock respectively simultaneously, the A mouth of the second two-position four-way solenoid valve divides two-way, be connected with the rod chamber of right front oil cylinder with left front oil cylinder respectively, the B mouth of the second two-position four-way solenoid valve divides two-way, be connected with the rodless cavity of right front oil cylinder with left front oil cylinder respectively, between the rodless cavity and rod chamber of left front oil cylinder and right front oil cylinder, be provided with bidirectional hydraulic lock respectively simultaneously.
2. hydraulic efficiency pressure system according to claim 1, it is characterized in that: also comprise the 3rd two-position four-way solenoid valve, the P mouth of the 3rd two-position four-way solenoid valve is connected with the A mouth of described hydraulic steering gear, the T mouth of the 3rd two-position four-way solenoid valve is connected with the B mouth of hydraulic steering gear, the A mouth of the 3rd two-position four-way solenoid valve is connected with the first actuator port of cross running hydraulic efficiency pressure system, and the B mouth of the 3rd two-position four-way solenoid valve is connected with the second actuator port of cross running hydrostatic steering system.
3. hydraulic efficiency pressure system according to claim 1 and 2, is characterized in that: be provided with pilot overflow valve in the bypass of described oil pump oil outlet.
4. hydraulic efficiency pressure system according to claim 2, it is characterized in that: described cross running hydrostatic steering system comprises the first one way sequence valve and the second one way sequence valve, through a point two-way after hydraulic oil flows into from the first actuator port of this cross running hydrostatic steering system, connect after the first one way sequence valve and communicate with the rod chamber of left back oil cylinder in one road, the rodless cavity of left back oil cylinder communicates with the rodless cavity oil circuit of right front oil cylinder, the rod chamber of right front oil cylinder is communicated with the second actuator port of this cross running hydrostatic steering system, the rod chamber of the left front oil cylinder of another Lu Zeyu communicates, the rodless cavity of left front oil cylinder communicates with the rodless cavity oil circuit of right back oil cylinder, the rod chamber of right back oil cylinder is connected after the second one way sequence valve and is communicated with the second actuator port of this cross running hydrostatic steering system.
5. hydraulic efficiency pressure system according to claim 4, it is characterized in that: between the rod chamber and the rod chamber of right front oil cylinder of described left back oil cylinder, be provided with bidirectional hydraulic lock, between the rod chamber and the rod chamber of left front oil cylinder of right back oil cylinder, be provided with bidirectional hydraulic lock.
6. hydraulic efficiency pressure system according to claim 5, it is characterized in that: described first one way sequence valve and the second one way sequence valve comprise a check valve and the two position three way directional control valve in parallel with this check valve respectively, the T mouth connected tank of this two position three way directional control valve, and control commutation by the pressure of P mouth.
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CN201646845U (en) * 2010-04-27 2010-11-24 宁波如意股份有限公司 Hydraulic device for controlling engineering vehicle to steer
CN102079331A (en) * 2010-12-27 2011-06-01 长沙科达建设机械制造有限公司 Hydraulic control device for multiple drive steering ways of wheel type vehicle
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