CN1266389C

CN1266389C - Oil Hydaulic executor communicating and communication recoving device

Info

Publication number: CN1266389C
Application number: CN 01136023
Authority: CN
Inventors: 本多伸久; 胁坂亮之
Original assignee: Komatsu Ltd
Current assignee: Koito Manufacturing Co Ltd; Komatsu Ltd
Priority date: 2000-09-29
Filing date: 2001-09-28
Publication date: 2006-07-26
Anticipated expiration: 2021-09-28
Also published as: JP2002106506A; CN1346940A

Abstract

The invnetion is to make a communication valve compact and facilitate structure for an apparatus of communication and releasing from the communication by reducing the number of ports in the communication valve. An inflow port of pressured fluid in either a port 7a or 7b of a hydraulic motor is selected in accordance with shifting position of a spool 4. The selected inflow port and a communication port 21 in the communication valve are in fluid communication with each other. On the other hand, the inflow port of pressured fluid in either a port 7'a or 7'b of a hydraulic motor 7' is selected in accordance with shifting position of a spool 4'. The selected inflow port and a communication port 22 in the communication valve are in fluid communication with each other. The communication valve permits the communication port 21 to communicate with the communication port 22 in accordance with a communicating signal and releases from communication between the communication ports 21 and 22 in accordance with a signal of releasing from the communication.

Description

The connection of oil pressure final controlling element and connection decontrol

Technical field

The present invention relates to make each inlet opening connection of a plurality of oil pressure final controlling element and remove the connection of the oil pressure final controlling element that is communicated with and be communicated with decontrol.

Background technique

As the oil pressure bulldozer by separately independently hydraulic motor drive the building machinery of right travel body and left runner running respectively, the flow of the pressure oil of supplying with to each hydraulic motor by control is controlled the direction and the speed of travelling.At building machinery forwards or the occasion of rear straight-line travelling, because hydraulic motor is supplied with the pressure oil of same traffic to the left and right,, left and right sides hydraulic motor carries out synchronous running so being the ridden in left or right direction body.At building machinery forwards or the occasion that turns to of the left and right sides any one party at rear, because the pressure oil flow difference supplied with of hydraulic motor is to the left and right carried out nonsynchronous running so left and right sides hydraulic motor is the ridden in left or right direction body.

And, be respectively equipped with separately and independently supply with the Pressure oil feeder road of pressing oil to the hydraulic motor of such building machinery.So, when making each hydraulic motor carry out run-in synchronism, the different situation of pressure oil flow that also oriented each hydraulic motor is supplied with.

Therefore, in building machinery, in the synchronous operated occasion of each hydraulic motor, be by the pressure of each hydraulic motor oil inlet opening is communicated with, make the flow of the pressure oil that flows into each hydraulic motor identical, in the occasion that makes each hydraulic motor carry out asynchronous running, be to use to be communicated with and to be communicated with decontrol and remove connection between the pressure oil inlet opening of each hydraulic motor.

Fig. 9 represents connection in the past and is communicated with decontrol.

In portion of right travel mechanism 100, the inlet 7a of hydraulic motor 7 is communicated with by pipeline 5, position control valve 200, pipeline 11 with the connecting port 61 of connecting valve 60, and the inlet 7b of hydraulic motor 7 is communicated with by pipeline 6, position control valve 200, pipeline 12 with the connecting port 62 of connecting valve 60.

Portion of right travel mechanism 100 ' in, hydraulic motor 7 ' inlet 7 ' a by pipeline 5 ', position control valve 200 ', pipeline 11 ' be communicated with the connecting port 63 of connecting valve 60, hydraulic motor 7 ' inlet 7 ' b and connecting valve 60 connecting port 64 by pipeline 6 ', position control valve 200 ', pipeline 12 ' be communicated with.

When forwards or the straight-line travelling signal at rear when being input to portion 100 of right travel mechanism, supply with as the controls of straight inlet signal to control inlet 215,216 and to press oil.In the occasion of advancing, the left of valve rod 4 in figure is to moving.So the outlet 1a of oil pressure pump 1 is communicated with by pipeline 2, position control valve 200, pipeline 5 with the inlet 7a of hydraulic motor 7.Under the occasion of straight-line travelling backward, the right of valve rod 4 in figure moves.So the outlet 1a of oil pressure pump 1 is communicated with by pipeline 2, position control valve 200, pipeline 6 with the inlet 7b of hydraulic motor 7.No matter be, all be in the pressure oil that supplies to control mouth 215,216, to select high pressure by bidirectional control valve 15 to press oily Ph1, and be entered into the pressure chamber 65 of connecting valve 60 in the occasion of advancing or retreating.

When forwards or the straight-line travelling signal at rear be input to left lateral and sail 100 ' time of portion of mechanism, to control inlet 215 ', 216 ' supply with as the control of straight inlet signal and press oil.In the occasion of advancing, the left of valve rod 4 ' in figure is to moving.So, oil pressure pump 1 ' outlet 1 ' a and hydraulic motor 7 ' inlet 7 ' a by pipeline 2 ', position control valve 200 ', pipeline 5 ' formation is communicated with.Under the occasion of straight-line travelling backward, the right of valve rod 4 ' in figure moves.So, oil pressure pump 1 ' outlet 1 ' a and hydraulic motor 7 ' inlet 7 ' b by pipeline 2 ', position control valve 200 ', pipeline 6 ' formation is communicated with.No matter be in the occasion of advancing or retreating, all be by bidirectional control valve 15 ' supply to control mouthfuls 215 ', 216 ' pressure oil in select high pressure and press oily Ph1 ', and be entered into the compression chamber 66 of connecting valve 60.

Press the pressure of oily Ph1, Ph1 ' identical owing to output to the high pressure of each compression chamber 65,66,, be not moved so valve rod 67 is positioned at the position of central authorities.When valve rod 67 was positioned at the neutral position, connecting port 61 was communicated with the notch 67a of connecting port 63 by valve rod 67, and connecting port 62 is communicated with the notch 67b of connecting port 64 by valve rod 67.Therefore, the inlet 7a of hydraulic motor 7 and hydraulic motor 7 ' inlet 7 ' a be communicated with, the inlet 7b of hydraulic motor 7 and hydraulic motor 7 ' inlet 7 ' b be communicated with.

So, be that conduct is under the occasion of the inlet opening of each hydraulic motor 7,7 ' input pressure oil, to the pressure oil of inlet 7a and 7 ' a supply same traffic that enters the mouth at inlet 7a and inlet 7 ' a.And, be that conduct is under the occasion of the inlet opening of each hydraulic motor 7,7 ' input pressure oil, to the pressure oil of inlet 7b and 7 ' b supply same traffic that enters the mouth at inlet 7b and inlet 7 ' b.

In addition,, press the pressure oil Ph1 that selects high pressure in the oil in the control of the control inlet 215,216 that supplies to portion of right travel mechanism 100, and be entered into the pressure chamber 65 of connecting valve 60 by bidirectional control valve 15 in the occasion that any one party to the left and right turns to.By bidirectional control valve 15 ' supply to left lateral sail portion of mechanism 100 ' control inlet 215 ', 216 ' control press the pressure oil Ph1 ' that selects high pressure in the oil, and be entered into the pressure chamber 66 of connecting valve 60.

Because the high pressure in the feed pressure chamber 65 press oily Ph1 and the high pressure in the feed pressure chamber 66 to press oily Ph1 ' formation pressure difference, so that the left or right either direction of valve rod 67 in figure move.So connecting port 61 was disengaged with being communicated with of connecting port 63, simultaneously also removed being communicated with of connecting port 62 and connecting port 64.Thus, the inlet 7a that has removed hydraulic motor 7 and hydraulic motor 7 ' inlet 7 ' a connected sum hydraulic motor 7 inlet 7b and hydraulic motor 7 ' being communicated with of inlet 7 ' b.

But connection in the past and the structure that is communicated with decontrol be, connection make press oil flow into each hydraulic motor 7,7 ' inflow entrance 7a, 7 ' a in, also be communicated with to make and press outflow opening 7b, the 7 ' b of oil from each hydraulic motor 7,7 ' outflow.Promptly, in connecting valve 60, be provided with its part belong to each hydraulic motor 7,7 ' the connecting port 61～64 of inlet, and, be provided with each connecting port 61,62,63,64 of being communicated with connecting valve 60 and each hydraulic motor 7,7 ' each enter the mouth 7a, 7 ' a, 7b, 7 ' b pipeline 11,11 ', 12,12 '.

And, constitute by bidirectional control valve 15,15 ' supply to portion of right travel mechanism 100 and left lateral sail portion of mechanism 100 ' all directions control valve 200,200 ' the pressure oil of control inlet in, select high pressure and press oil, supply with the control inlet of connecting valve 60.

This shows that bulky problem and number of parts that above-mentioned formation exists connecting valve 60 are many, the problem of the complex structure of connection and connection decontrol etc.

The present invention proposes in view of the above problems, and to reduce the connecting port quantity of connecting valve, volume and the simplification of dwindling connecting valve are communicated with and are communicated with the structure of decontrol as the problem that addresses the above problem.

Summary of the invention

So, the 1st invention is a kind of oil pressure final controlling element (7,7 ') connection and be communicated with decontrol, be a kind of have corresponding to 2 logical hydraulic fluid port (7a, 7b) wantonly 1 as inflow entrance, flow into and press oil, simultaneously in 2 logical hydraulic fluid ports in addition 1 as outflow opening, flow out and press oil, the a plurality of oil pressure final controlling element (7 that carry out the postive direction running or turn round in the other direction, 7 '), with with above-mentioned oil pressure final controlling element (7,7 ') the 1st direction control that is communicated with of the logical hydraulic fluid port of a side mouthfuls (304,304 '), with with above-mentioned oil pressure final controlling element (7,7 ') the 2nd direction control that is communicated with of the logical hydraulic fluid port of opposite side mouthfuls (310,310 '), a plurality of direction control mechanisms (3 of the feeding direction of pressing oil are supplied with in control to above-mentioned oil pressure final controlling element, 3 '), be communicated with above-mentioned a plurality of oil pressure final controlling element (7 with corresponding communications signals, 7 ') each inflow entrance, above-mentioned a plurality of oil pressure final controlling element (7 is removed in corresponding connection ring off signal, 7 ') each inflow entrance between connection means of communication (20) the oil pressure final controlling element connection and be communicated with decontrol, it is characterized in that, in this device, be included in above-mentioned the 1st direction control mouth (304,304 ') and the 2nd direction control mouth 310,310 ') in select to above-mentioned oil pressure final controlling element (7,7 ') supply with to press a plurality of selection mechanisms (4 of the direction control mouthful of oil, 4 '), the corresponding communications signals of above-mentioned means of communication (20) is communicated with by above-mentioned a plurality of selection mechanisms (4,4 ') all directions that choose control mouthfuls (304,304 '), corresponding connection ring off signal is removed by above-mentioned a plurality of selection mechanisms (4,4 ') connection between all directions that the choose control mouthful.

And, the feature of the 2nd invention is, in the formation of the 1st invention, above-mentioned direction control mechanism (3,3 ') is the position control valve with above-mentioned selection mechanism (4,4 '), the mobile position of corresponding valve rod (4,4 ') is selected to above-mentioned oil pressure final controlling element (7,7 ') and is supplied with the direction control mouthful of pressing oil (304,310,304 ', 310 ').

Below, the 1st and the 2nd invention described.

With reference to Fig. 1, Fig. 4～Fig. 7 the action of this connection and connection decontrol is described.

In the speed occasion of straight-line travelling forwards that makes building machinery with regulation, make building machinery forwards the straightaway signal of straight-line travelling be imported into portion of right travel mechanism 50 and left lateral sail portion of mechanism 50 '.And the communications signals that connecting port 21 is communicated with connecting port 22 is imported into connecting valve 20.

At first, with reference to Fig. 1 and Fig. 4 the action of portion of right travel mechanism 50 is described.Solid arrow represents to press the flow direction of oil in Fig. 5.

In portion of right travel mechanism 50, press oily P1 to be fed into control mouth 315 as the low voltage control of straight inlet signal, high voltage control presses oily P2 to be fed into control mouth 316.When the pressure of pressing oily P2 when control was pressed the spring force of the pressure of oily P1 and spring 321 greater than control, valve rod 4 promoted spring 321 and breaks 323, from the left of middle position to figure to moving.Fig. 4 represents this state.Corresponding valve rod 4 is moving of direction left from middle position, Pressure oil feeder portion 301 is communicated with by notch 41 with pipeline 302, and pipeline 303 is communicated with by notch 42 with pipeline 305.

Thereby, the logical hydraulic fluid port 7a that the pressure oil of discharging from oil pressure pump 1 flows into as the inflow entrance of hydraulic motor 7 by Pressure oil feeder portion 301, pipeline 302, direction control mouth 304, pipeline 5.So, make the running of hydraulic motor postive direction.At this moment the flow that inflow is led to the pressure oil of hydraulic fluid port 7a is made as Q1.The direction control of the pressure oil that flows out from the logical hydraulic fluid port 7b as the outflow opening of hydraulic motor 7 by position control valve 3 mouthfuls 310, pipeline 308,309 turn back to fuel tank.

Simultaneously, the flow through pressure oil of pipeline 302 flows into the connecting port 21 of connecting valves 20 by pipeline 303,305, direction control mouthfuls 306, pipeline 8.

Below, with reference to Fig. 1 and Fig. 5 to left lateral sail portion of mechanism 50 ' action describe.In Fig. 5, solid arrow represents to press the flow direction of oil.

Left lateral sail portion of mechanism 50 ' in, as the low voltage control of straight inlet signal press oily P1 ' be fed into control mouthfuls 315 ', high voltage control press oily P2 ' be fed into control mouthfuls 316 '.The pressure of pressing oily P2 ' when control greater than control press the pressure of oily P1 ' and spring 321 ' spring force the time, valve rod 4 ' promotions spring 321 ' and break 323 ', from the left of middle position to figure to mobile.Fig. 5 represents this state.Corresponding valve rod 4 ' from middle position is moving of direction left, make Pressure oil feeder portion 301 ' with pipeline 302 ' by notch 41 ' be communicated with, and make pipeline 303 ' with pipeline 305 ' by notch 42 ' be communicated with.

Thereby, from the pressure of oil pressure pump 1 ' discharge oil by Pressure oil feeder portion 301 ', pipeline 302 ', direction control mouthfuls 304 ', pipeline 5 ' inflow as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' a of inflow entrance.So, make the running of hydraulic motor 7 ' postive direction.At this moment the flow that inflow is led to the pressure oil of hydraulic fluid port 7 ' a is made as Q1 '.From as hydraulic motor 7 ' the pressure oil that flows out of the logical hydraulic fluid port 7 ' b of outflow opening by position control valve 3 ' direction control mouthfuls 310 ', pipeline 308 ', 309 ' turn back to fuel tank.

Simultaneously, flow through pipeline 302 ' pressure oil by pipeline 303 ', 305 ', direction control mouthfuls 306 ', the connecting port 22 of pipeline 8 ' inflow connecting valve 20.

Below, the action of connecting valve 20 is described.

In connecting valve 20, as communications signals, control presses oily Pa to be fed into control mouth 24.The spring force of the pressure of oily Pa less than spring 25 pressed in control, and valve rod 23 is not moved on the neutral position.Because valve rod 23 is positioned at the neutral position, so connecting port 21 is communicated with connecting port 22.

By above action, make as the logical hydraulic fluid port 7a of the inflow entrance of hydraulic motor 7 with as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' a of inflow entrance be communicated with.If pressure oil that flows into logical hydraulic fluid port 7a and the difference in flow that flows into the pressure oil of logical hydraulic fluid port 7 ' a are made as Q1-Q1 '=q1 (q1＞0), then the pressure of the amount of q1/2 oil by connecting valve 20 flow into hydraulic motors 7 ' logical hydraulic fluid port 7 ' a.Therefore, the pressure oil flow that flows into the logical hydraulic fluid port 7a of hydraulic motor 7 is Q1-(q1/2), flow into hydraulic motor 7 ' the pressure oil flow of logical hydraulic fluid port 7 ' a be Q1 '+(q1/2), hydraulic motor 7 and hydraulic motor 7 ' be that synchronous postive direction turns round.

Then, in the speed occasion of straight-line travelling rearward that makes building machinery with regulation, make building machinery rearward the straightaway signal of straight-line travelling be imported into portion of right travel mechanism 50 and left lateral sail portion of mechanism 50 '.And the communications signals that connecting port 21 is communicated with connecting port 22 is imported into connecting valve 20.

At first, with reference to Fig. 1 and Fig. 6 the action of portion of right travel mechanism 50 is described.Solid arrow represents to press the flow direction of oil in Fig. 6.

In portion of right travel mechanism 50, press oily P1 to be fed into control mouth 315 as the high voltage control of straight inlet signal, low voltage control presses oily P2 to be fed into control mouth 316.When the pressure of pressing oily P1 when control was pressed the spring force of the pressure of oily P2 and spring 322 greater than control, valve rod 4 promoted spring 322 and breaks 324, moves from the right of middle position to figure.Fig. 6 represents this state.Corresponding valve rod 4 moves from middle position, and Pressure oil feeder portion 307 is communicated with by notch 43 with pipeline 308, and pipeline 309 is communicated with by the oil of the pressure in the valve rod 4 inflow portion 44, valve rod internal pipeline 45, the oily outflow of pressure portion 46 with pipeline 305.

Thereby, from the oily logical hydraulic fluid port 7b that flows into as the inflow entrance of hydraulic motor 7 by Pressure oil feeder portion 307, pipeline 308, direction control mouth 310, pipeline 6 of the pressure of oil pressure pump 1 output.So, hydraulic motor is turned round in the other direction.At this moment the flow that inflow is led to the pressure oil of hydraulic fluid port 7b is made as Q2.The direction control of the pressure oil that flows out from the logical hydraulic fluid port 7a as the outflow opening of hydraulic motor 7 by position control valve 3 mouthfuls 304, pipeline 302,303 turn back to fuel tank.

Simultaneously, flow through pressure oil inflow portion 44, valve rod internal pipeline 45 by pipeline 309, valve rod 4 of the pressure oil of pipeline 308, press oily outflow portion 46, pipeline 305, direction control mouthfuls 306, pipeline 8 to flow into the connecting port 21 of connecting valves 20.

Below, with reference to Fig. 1 and Fig. 7 to do traveling mechanism portion 50 ' action describe.In Fig. 7, solid arrow represents to press the flow direction of oil.

Left lateral sail portion of mechanism 50 ' in, as the high voltage control of straight inlet signal press oily P1 ' be fed into control mouthfuls 315 ', low voltage control press oily P2 ' be fed into control mouthfuls 316 '.The pressure of pressing oily P1 ' when control greater than control press the pressure of oily P2 ' and spring 322 ' spring force the time, valve rod 4 ' promotions spring 322 ' reach break 324 ', move from the right of middle position to figure.Fig. 7 represents this state.Corresponding valve rod 4 ' moving to right from middle position, make Pressure oil feeder portion 307 ' with pipeline 308 ' by notch 43 ' be communicated with, and make pipeline 309 ' with the pressure oil inflow portion 44 of pipeline 305 ' by valve rod 4 ' interior ', valve rod internal pipeline 45 ', press oily outflow portion 46 ' constitute to be communicated with.

Thereby, from the pressure of oil pressure pump 1 ' discharge oil by Pressure oil feeder portion 307 ', pipeline 308 ', direction control mouthfuls 310 ', pipeline 6 ' inflow as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' b of inflow entrance.So make hydraulic motor 7 ' opposite direction running.At this moment the flow that inflow is led to the pressure oil of hydraulic fluid port 7 ' b is made as Q2 '.From as hydraulic motor 7 ' the pressure oil that flows out of the logical hydraulic fluid port 7 ' a of outflow opening by position control valve 3 ' direction control mouthfuls 304 ', pipeline 302 ', 303 ' turn back to fuel tank.

Simultaneously, flow through pipeline 308 ' pressure oil by pipeline 309 ', valve rod 4 ' pressure oil inflow portion 44 ', valve rod internal pipeline 45 ', press oily outflow portion 46 ', pipeline 305 ', direction control mouthfuls 306 ', the connecting port 22 of pipeline 8 ' inflow connecting valve 20.

The action of connecting valve 20 is with identical in the occasion of directly advancing forward.

By above action, make as the logical hydraulic fluid port 7b of the inflow entrance of hydraulic motor 7 with as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' b of inflow entrance be communicated with.If pressure oil that flows into logical hydraulic fluid port 7b and the difference in flow that flows into the pressure oil of logical hydraulic fluid port 7 ' b are made as Q2-Q2 '=q2 (q2＞0), then the pressure of the amount of q2/2 oil by connecting valve 20 flow into hydraulic motors 7 ' logical hydraulic fluid port 7 ' b.Therefore, the pressure oil flow that flows into the logical hydraulic fluid port 7b of hydraulic motor 7 is Q2-(q2/2), flow into hydraulic motor 7 ' the pressure oil flow of logical hydraulic fluid port 7 ' b be Q2 '+(q2/2), hydraulic motor 7 and hydraulic motor 7 ' be that synchronous opposite direction turns round.

Then, make building machinery to the left and right any direction turn to the occasion of advancing, the occasion of advancing for example to the right front, the right front that building machinery is advanced to the right front advance signal be given to altogether portion of right travel mechanism 50 and left lateral sail portion of mechanism 50 '.And a releasing connecting port 21 supplies to connecting valve 20 with the connection ring off signal that is communicated with of connecting port 22.

In portion of right travel mechanism 50, as the right front signal of advancing, press the control of low pressure oily P1 to supply to control mouthfuls 315, press the control of high pressure oily P2 to supply to control mouthfuls 316.So, valve rod 4 from middle position to figure left to moving.So identical with the occasion that makes the building machinery straight ahead, hydraulic motor 7 is the running of postive direction.At this moment the pressure oil flow that flows into logical hydraulic fluid port 7a is made as Q3.

Left lateral sail portion of mechanism 50 ' in, as the right front signal of advancing, the control of low pressure press oily P1 ' supply to control mouthfuls 315 ', the control of high pressure press oily P2 ' supply to control mouthfuls 316 '.So, valve rod 4 ' from middle position to figure left to moving.So, identical with the occasion that makes the building machinery straight ahead, hydraulic motor 7 ' be the running of postive direction.At this moment the pressure oil flow that flows into logical hydraulic fluid port 7 ' a is made as Q3 '.

Below, the action of connecting valve 20 is described.

In connecting valve 20, as being communicated with ring off signal, control presses oily Pb to be fed into control mouth 24.The spring force of the pressure of oily Pb greater than spring 25 pressed in control, and valve rod 23 is moved from middle position right to figure.So, removed being communicated with of connecting port 21 and connecting port 22 by valve rod 23.

By above action, removed as the logical hydraulic fluid port 7a of hydraulic motor 7 inflow entrances and being communicated with as the logical hydraulic fluid port 7 ' a of hydraulic motor 7 ' inflow entrance.Therefore, the flow of pressure oil that flows into the logical hydraulic fluid port 7a of hydraulic motor 7 is Q3, flow into hydraulic motor 7 ' the flow of pressure oil of logical hydraulic fluid port 7 ' a be Q3 '.Because flow Q3 is not equal to flow Q3 ', so hydraulic motor 7 and hydraulic motor 7 ' the be formed on asynchronous running on the postive direction.

According to aforesaid the 1st, the 2nd invention, the position of the valve rod 4 of corresponding position control valve 3, can select logical hydraulic fluid port as the inflow entrance of hydraulic motor 7, corresponding position control valve 3 ' valve rod 4 ' the position, can select as hydraulic motor 7 ' the logical hydraulic fluid port of inflow entrance.And, the connecting port 21 of connecting valve 20 is communicated with the logical hydraulic fluid port 7a (or 7b) of the hydraulic motor 7 that is selected, the connecting port 21 of connecting valve 20 and the hydraulic motor 7 that is selected ' logical hydraulic fluid port 7 ' a (or 7 ' b) be communicated with.Therefore, the connecting port quantity of connecting valve is identical with the quantity of hydraulic motor.

And connecting valve 20 is under the occasion as the control Pressure oil feeder to 1 of a communications signals control mouthfuls 24, and valve rod 23 is not moved, and under the occasion as the control Pressure oil feeder to 1 that is communicated with a ring off signal control mouth 24, valve rod 23 is moved.Therefore, saved traveling mechanism portion to the right 50 and do traveling mechanism portion 50 ' all directions control valve 3,3 ' the pressure oil given of control confession be re-supplied to the pipeline of the control mouth of connecting valve.

Therefore, can reduce the connecting port quantity of connecting valve 20, dwindle the volume of connecting valve 20.And respectively with pipeline 8,8 ' be communicated with connecting valve 20 and all directions control valve 3,3 ', and not needs make all directions control valve 3,3 ' the parts that are communicated with the control mouth of connecting valve of each control mouth, so simplified the structure of connection and connection decontrol.

And, the 3rd invention is, a kind of connection of oil pressure final controlling element and connection decontrol, be a kind of have corresponding to 2 logical hydraulic fluid port (7a, 7b) wantonly 1 as inflow entrance, flow into and press oil, simultaneously in 2 logical hydraulic fluid ports wantonly 1 as outflow opening, flow out and press oil, the a plurality of oil pressure final controlling element (7 that carry out the postive direction running or turn round in the other direction, 7 '), with with above-mentioned oil pressure final controlling element (7,7 ') the 1st direction control that is communicated with of the logical hydraulic fluid port of a side mouthfuls (304,304 '), with with above-mentioned oil pressure final controlling element (7,7 ') the 2nd direction control that is communicated with of the logical hydraulic fluid port of opposite side mouthfuls (310,310 '), a plurality of direction control mechanisms (3 of the feeding direction of pressing oil are supplied with in control to above-mentioned oil pressure final controlling element, 3 '), be communicated with above-mentioned a plurality of oil pressure final controlling element (7 with corresponding communications signals, 7 ') each inflow entrance, above-mentioned a plurality of oil pressure final controlling element (7 is removed in corresponding connection ring off signal, 7 ') each inflow entrance between the means of communication (20) of connection, with with above-mentioned oil pressure final controlling element (7,7 ') the corresponding a plurality of capacity variable type oil pressure pumps (1 that are provided with, 1 '), with the above-mentioned oil pressure final controlling element (7 of correspondence, 7 ') load pressure-controlled and above-mentioned oil pressure final controlling element (7,7 ') the corresponding a plurality of capacity variable type oil pressure pumps (1 that are provided with, 1 ') a plurality of capacity control mechanisms (70 of capacity, 70 ') the oil pressure final controlling element connection and be communicated with decontrol, it is characterized in that, in this device, be included in above-mentioned the 1st direction control (304,304 ') and the 2nd direction control mouth (310,310 ') in select to above-mentioned oil pressure final controlling element (7,7 ') supply with to press a plurality of selection mechanisms (4 of the direction control mouthful of oil, 4 '), the corresponding communications signals of above-mentioned means of communication (20) is communicated with by above-mentioned a plurality of selection mechanisms (4,4 ') all directions that choose control mouthfuls (304,304 '), corresponding connection ring off signal is removed by above-mentioned a plurality of selection mechanisms (4,4 ') connection between all directions that the choose control mouthful, above-mentioned capacity control mechanism (70 simultaneously, 70 ') the above-mentioned oil pressure pump (1 of pressure control of the corresponding pressure oil of giving from all directions control confession that is communicated with by above-mentioned means of communication (20), 1 ') capacity.

Below, with reference to Fig. 8 the 3rd invention described.

Since the swash plate driving mechanism portion 70 of portion of right travel mechanism 50 and left lateral sail portion of mechanism 50 ' swash plate driving mechanism portion at structure and move identical, so be that example describes only here with swash plate driving mechanism portion 70.

The load of hydraulic motor 7 is pressed the control mouth 71c that is fed into LS valve 71 by pipeline 75, and the pump pressure of oil pressure pump 1 is fed into the control 71d of LS valve 71 by pipeline 79.When the pressure difference between them surpassed the pressure of regulation, the valve position of LS valve 71 was to position 71a side shifting.At this moment, press oily P1 to be fed into pressure chamber 73 by pipeline 76, LS valve 71, pipeline 77.Be fed into the 74a of spring housing from the pressure oil of oil pressure pump 1 output by pipeline 79.Compression area at the auxiliary follow up piston 72 of compression chamber 73 1 sides is different with the compression area of the auxiliary follow up piston 72 of the 74a of spring housing side.When the pressure of pressing oily PL surpassed the pressure of the elastic force of spring 74 and the pressure oil that supplies to the 74a of spring housing, auxiliary follow up piston 72 was driven by the direction (the MIN side among the figure) to the capacity minimum that makes oil pressure pump 1.And when pressure difference between the pump pressure of control mouth 71d of LS valve 71 is pressed and supplied to the control mouth 71c load that is supplying to LS valve 71 less than the pressure of regulation, the valve position of LS valve 71 was to position 71b side shifting.At this moment, the pressure oil in the pressure chamber 73 is discharged in the fuel tank 78 by pipeline 77, LS valve 71.So, drive auxiliary follow up piston 72 and move to the direction (the MAX side among the figure) of the capacity minimum that makes oil pressure pump 1.With such method the tilt angle of the swash plate 1b of oil pressure pump 1 is controlled.

In the 3rd invention, each hydraulic motor 7,7 ' inflow entrance between be connected or be disengaged connection by connecting valve 20.

Make the vehicle occasion of straight-line travelling forward, supplying with to the control mouth 24 of connecting valve 20 and press oily Pa as the control of communications signals.So, make as the logical hydraulic fluid port 7a of the inflow entrance of hydraulic motor 7 with as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' a of inflow entrance be communicated with.Make the vehicle occasion of straight-line travelling rearward, supplying with to the control mouth 24 of connecting valve 20 and press oily Pa as the control of communications signals.So, make as the logical hydraulic fluid port 7b of the inflow entrance of hydraulic motor 7 with as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' b of inflow entrance be communicated with.In addition, vehicle to the left and right the either party turn to the occasion of travelling, supply with as the pressure oil Pb that is communicated with ring off signals to the control mouth 24 of connecting valve 20.So valve rod 23 right direction in figure moves, and removes the connection between each inflow entrance.

Identical with the 1st, the 2nd invention, by connecting valve 20 is set, can make the pressure oil flow that flows into hydraulic motor 7 with flow into hydraulic motor 7 ' pressure oil flow basic identical.Therefore, make hydraulic motor 7 and hydraulic motor 7 ' formation run-in synchronism.

Since the pressure oil that flows into hydraulic motor 7 from oil pressure pump 1 with from oil pressure pump 1 ' inflows hydraulic motor 7 ' the difference in flow of pressure oil press by its load of connecting valve 20 backs basic identical, so can form than littler swash plate control mechanism portion originally.So, by connecting valve 20, be not provided with swash plate control mechanism portion 70,70 ' situation compare, can make from the inflow entrance of the hydraulic motor 7 of a side flow into opposite side hydraulic motor 7 ' inflow entrance pressure oil flow still less.Because this flow is few, so, each connecting

port

21,22 of connecting valve 20 can be dwindled and pipeline that the connecting valve that is communicated with connecting

port

21,22 20 is interior.

As mentioned above, according to the 3rd invention, owing to can dwindle each connecting

port

21,22 of connecting valve 20 and pipeline that the connecting valve that is communicated with connecting

port

21,22 20 is interior, can constituent ratio the 1st, the 2nd the littler connecting valve of invention.And, can dwindle connecting valve 20 and all directions control valve 3,3 ' between pipeline 8,8 '.

Description of drawings

Fig. 1 is the pie graph of the expression embodiment of the invention 1.

Fig. 2 is the figure of the position control valve of portion of expression right travel mechanism, and the expression valve rod is an intermediateness.

Fig. 3 is the figure that the expression left lateral is sailed the position control valve of portion of mechanism, and the expression valve rod is an intermediateness.

Fig. 4 is the figure of the position control valve of portion of expression right travel mechanism, the state that the expression valve rod moves for direction left.

Fig. 5 is the figure of the position control valve of portion of expression ridden in left or right direction mechanism, the state that the expression valve rod moves for direction left.

Fig. 6 is the figure of the position control valve of portion of expression right travel mechanism, the state of expression valve rod for moving to right.

Fig. 7 is the figure that the expression left lateral is sailed the position control valve of portion of mechanism, the state of expression valve rod for moving to right.

Fig. 8 is the pie graph of expression embodiments of the invention 2.

Fig. 9 is the pie graph of expression conventional art.

In the drawings, 1,1 '-oil pressure pump, 3,3 '-position control valve, 304,310,304 ', 310 '-direction control mouthful, 4,4 '-valve rod, 7,7 '-hydraulic motor, 7a, 7b, 7 ' a, 7 ' b-mouth, the 20-connecting valve, 21, the 22-connecting port, 70,70 '-swash plate driving mechanism portion.

Embodiment

Below, with reference to view the connection of oil pressure final controlling element of the present invention and the embodiment of connection decontrol are described.

In addition, suppose that in the present embodiment the oil pressure final controlling element is the hydraulic motor that is arranged in the runner of building machinery.

Fig. 1 is the pie graph of expression embodiments of the invention 1.Fig. 2 is the figure of the position control valve of portion of expression right travel mechanism, and the expression valve rod is an intermediateness.Fig. 3 is the figure that the expression left lateral is sailed the position control valve of portion of mechanism, and the expression valve rod is an intermediateness.In addition, connecting valve 20 is set directly on the position control valve 3 in Fig. 2.And position control valve shown in Figure 2 is arranged side by side on the direction vertical with drawing with position control valve shown in Figure 3.

The connection of present embodiment and be communicated with decontrol by portion of right travel mechanism 50, left lateral sail portion of mechanism 50 ' and connecting valve 20 constitute.Left lateral is sailed portion of mechanism 50 ' structurally basic identical with portion of right travel mechanism 50, left lateral sail portion of mechanism 50 ' component parts in every that its symbol is added the component parts of (') mark is identical with the component parts of portion of right travel mechanism 50.Below, describe with portion of right travel mechanism 50 typical examples, for left lateral sail portion of mechanism 50 ', only the different piece with portion of right travel mechanism 50 is described.

Portion of right travel mechanism 50 roughly is made of oil pressure pump 1, position control valve 3 and hydraulic motor 7.

Oil pressure pump 1 has delivery outlet 1a and the swash plate 1b that oil is pressed in output.

Has the Pressure oil feeder portion 301 that supplies with pressure oil from oil pressure pump 1 in the inside of position control valve 3,307, with pipeline 302,305,308, with the pipeline 303 that comes out from pipeline 302 branches, with the pipeline 309 that comes out from pipeline 308 branches, valve rod sliding eye 33 with built-in valve rod 4, with the break 323 that leans at a side end of valve rod 4, with the break 324 that leans in the end side of valve rod 4, with the spring 321 that is installed on the break 323, with the spring 322 that is installed on the break 324.

In the outside of position control valve 3, have with pipeline 302 together with direction control mouthfuls 304 and with pipeline 308 together with direction control mouthfuls 310 and with pipeline 305 together with direction control mouthfuls 306 and supply with the control mouth 315,316 of the control of valve rod 4 two ends formation effects being pressed oil.

Valve rod 4 is arranged in the valve rod sliding eye 33 sliding freely.

On valve rod 4, be formed with

notch

41,42,43 and press oily input part 44 and valve rod internal pipeline 45 and oil pressure output 46.On the longitudinal direction of valve rod 4 inside, form valve rod internal pipeline 45.Oil pressure output 46 penetrates into valve rod internal pipeline 45 valve rods from the slip surface of valve rod 4, forms with internal pipeline 45 to be communicated with.

Valve rod 4 is pressed oily P1 in the control that supplies to control mouthfuls 315 pressure is pressed the occasion of the elastic force of the pressure of oily P2 and spring 322 greater than the control that supplies to control mouthfuls 316, promote spring 322 and break 324, its right direction in figure is moved, the pressure of pressing oily P2 in the control that supplies to control mouthfuls 316 is pressed the occasion of the elastic force of the pressure of oily P1 and spring 321 greater than the control that supplies to control mouthfuls 315, promote spring 321 and break 323, its left direction in figure is moved.And valve rod 4 stops at and supplies to the control of control mouth 315,316 and presses the oily corresponding position of pressure difference.By changing the position of valve rod 4, change Pressure oil feeder flow to hydraulic motor 7, change the running speed of hydraulic motor 7.

On valve rod 4, be formed with

notch

Hydraulic motor 7 has logical hydraulic fluid port 7a, 7b.Logical hydraulic fluid port 7a during for inflow entrance logical hydraulic fluid port 7b be outflow opening, this moment, hydraulic motor was the forward running.Logical hydraulic fluid port 7b during for inflow entrance logical hydraulic fluid port 7a be outflow opening, this moment, hydraulic motor was an antiport.

Connecting valve 20 has connecting

port

21,22 and moves freely valve rod 23 and control mouthfuls 24 and spring 25 in inside.When valve rod 23 during in the neutral position, connecting port 21 is communicated with connecting port 22.During greater than the spring force of the spring 25 in the control mouthfuls 24, the right of valve rod 23 in figure moves at the pressure of the pressure oil that flows into, and removes being communicated with of connecting port 21 and connecting port 22.

Below, the annexation of each component part is described.

The outlet 1a of oil pressure pump 1 is communicated with the Pressure oil feeder portion 301,307 of position control valve 3 by pipeline 2.

The position of the notch 41 of Pressure oil feeder portion 301 corresponding valve rods 4 is communicated with pipeline 302, or removes connection.Pipeline 302 is communicated with direction control mouth 304.And branch out pipeline 303 from pipeline 302.The position of the notch 42 of pipeline 303 corresponding valve rods 4 is communicated with by pipeline 305 and direction control mouth 306 or removes connection.

The position of the notch 43 of Pressure oil feeder portion 307 corresponding valve rods 4 is communicated with pipeline 308 or removes connection.Pipeline 308 is communicated with direction control mouth 310.And branch out pipeline 309 from pipeline 308.The position of the notch 44 of pipeline 309 corresponding valve rods 4 is communicated with direction control mouth 306 by valve rod internal pipeline 45, oil pressure output 46, pipeline 305 or removes connection.

Direction control mouth 304 is communicated with the logical hydraulic fluid port 7a of hydraulic motor 7 by pipeline 5.Direction control mouth 310 is communicated with the logical hydraulic fluid port 7b of hydraulic motor 7 by pipeline 6.

Direction control mouth 306 is communicated with the connecting port 21 of connecting valve 20 by pipeline 8.

In addition, left mechanism 50 ' direction control mouthfuls 306 ' by pipeline 8 ' be communicated with the connecting port 22 of connecting valve 20.

Below, with reference to Fig. 1, Fig. 4～Fig. 7 the action that is communicated with and is communicated with decontrol is described.

Fig. 4 is the figure of the position control valve of portion of expression right travel mechanism, the state that the expression valve rod moves for direction left.Fig. 5 is the figure of the position control valve of portion of expression ridden in left or right direction mechanism, the state that the expression valve rod moves for direction left.Fig. 6 is the figure of the position control valve of portion of expression right travel mechanism, the state of expression valve rod for moving to right.Fig. 7 is the figure that the expression left lateral is sailed the position control valve of portion of mechanism, the state of expression valve rod for moving to right.

In the speed occasion of straight-line travelling forwards that makes building machinery with regulation, make building machinery forwards the straightaway signal of straight-line travelling be imported into portion of right travel mechanism 50 and do traveling mechanism portion 50 '.And, make connecting port 21 form the communications signals that is communicated with and be imported into connecting valve 20 with connecting port 22.

Simultaneously, the flow through pressure oil of pipeline 302 flows into the connecting port 22 of connecting valves 20 by pipeline 303,305, direction control mouthfuls 306, pipeline 8.

Below, with reference to Fig. 1 and Fig. 5 to do traveling mechanism portion 50 ' action describe.In Fig. 5, solid arrow represents to press the flow direction of oil.

Left lateral sail portion of mechanism 50 ' in, as the low voltage control of straight inlet signal press oily P1 ' be fed into control mouthfuls 315 ', high voltage control press oily P2 ' be fed into control mouthfuls 316 '.The pressure of pressing oily P2 ' when control greater than control press the pressure of oily P1 ' and spring 321 ' spring the time, valve rod 4 ' promotions spring 321 ' and break 323 ', from the left of middle position to figure to mobile.Fig. 5 represents this state.Corresponding valve rod 4 ' from middle position is moving of direction left, make Pressure oil feeder portion 301 ' with pipeline 302 ' by notch 41 ' be communicated with, and make pipeline 303 ' with pipeline 305 ' by notch 42 ' be communicated with.

Below, the action of connecting valve 20 is described.

In connecting valve 20, as communications signals, control presses oily Pa to be fed into control mouth 24.The elastic force of the pressure of oily Pa less than spring 25 is pressed in control, and valve rod 23 is not moved on the neutral position.Because valve rod 23 is positioned at the neutral position, so connecting port 21 is communicated with connecting port 22.

Then, in the speed occasion of straight-line travelling rearward that makes building machinery with regulation, make building machinery rearward the straightaway signal of straight-line travelling be imported into portion of right travel mechanism 50 and left lateral sail portion of mechanism 50 '.And, make connecting port 21 form the communications signals that is communicated with and be imported into connecting valve 20 with connecting port 22.

In portion of right travel mechanism 50, press oily P1 to be fed into control mouth 315 as the high voltage control of straight inlet signal, low voltage control presses oily P2 to be fed into control mouth 316.When the pressure of pressing oily P1 when control was pressed the elastic force of the pressure of oily P2 and spring 322 greater than control, valve rod 4 promoted spring 322 and breaks 324, moves from the right of middle position to figure.Fig. 6 represents this state.Corresponding valve rod 4 is moving to right from middle position, Pressure oil feeder portion 307 is communicated with by recessed portion's 43 formations of owing with pipeline 308, and pipeline 309 is communicated with by the oil of the pressure in the valve rod 4 inflow portion 44, valve rod internal pipeline 45, the oily outflow of pressure portion 46 formations with pipeline 305.

Thereby, the logical hydraulic fluid port 7b that the pressure oil of discharging from oil pressure pump 1 flows into as the inflow entrance of hydraulic motor 7 by Pressure oil feeder portion 307, pipeline 308, direction control mouth 310, pipeline 6.So, make hydraulic motor 7 running in the other direction.At this moment the flow that inflow is led to the pressure oil of hydraulic fluid port 7b is made as Q2.The direction control of the pressure oil that flows out from the logical hydraulic fluid port 7a as the outflow opening of hydraulic motor 7 by position control valve 3 mouthfuls 304, pipeline 302,303 turn back to fuel tank.

Thereby, from the pressure of oil pressure pump 1 ' output oil by Pressure oil feeder portion 307 ', pipeline 308 ', direction control mouthfuls 310 ', pipeline 6 ' inflow as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' b of inflow entrance.So, make hydraulic motor 7 ' opposite direction running.At this moment the flow that inflow is led to the pressure oil of hydraulic fluid port 7 ' b is made as Q2 '.From as hydraulic motor 7 ' the pressure oil that flows out of the logical hydraulic fluid port 7 ' a of outflow opening by position control valve 3 ' direction control mouthfuls 304 ', pipeline 302 ', 303 ' turn back to fuel tank.

Simultaneously, flow through pipeline 308 ' pressure oil by pipeline 309 ', valve rod 4 ' pressure oil inflow portion 44 ', valve rod internal pipeline 45 ', press oily outflow portion 46 ', pipeline 305 ', direction control mouthfuls 306 ', the connecting port 21 of pipeline 8 ' inflow connecting valve 20.

Then, make building machinery to the left and right any direction turn to the occasion of advancing, the occasion of advancing for example to the right front, the right front that building machinery is advanced to the right front advance signal be fed into portion of right travel mechanism 50 and do traveling mechanism portion 50 '.And a releasing connecting port 21 supplies to connecting valve 20 with the connection ring off signal that is communicated with of connecting port 22.

Left lateral sail portion of mechanism 50 ' in, as the right front signal of advancing, the control of low pressure press oily P1 ' supply to control mouthfuls 315 ', the control of high pressure press oily P2 ' supply to control mouthfuls 316 '.So, valve rod 4 ' from middle position to figure left to moving.So identical with the occasion that makes the building machinery straight ahead, hydraulic motor 7 ' be the running of postive direction.At this moment the pressure oil flow that flows into logical hydraulic fluid port 7 ' a is made as Q3 '.

Below, the action of connecting valve 20 is described.

According to aforesaid present embodiment, the position of the valve rod 4 of corresponding position control valve 3, can select logical hydraulic fluid port as the inflow entrance of hydraulic motor 7, corresponding position control valve 3 ' valve rod 4 ' the position, can select as hydraulic motor 7 ' the logical hydraulic fluid port of inflow entrance.And, the connecting port 21 of connecting valve 20 is communicated with the logical hydraulic fluid port 7a (or 7b) of the hydraulic motor 7 that is selected, the connecting port 21 of connecting valve 20 and the hydraulic motor 7 that is selected ' logical hydraulic fluid port 7 ' a (or 7 ' b) be communicated with.Therefore, the connecting port quantity of connecting valve is identical with the quantity of hydraulic motor.

Therefore, can reduce the connecting port quantity of connecting valve 20, dwindle the volume of connecting valve 20.And respectively with pipeline 8,8 ' be communicated with connecting valve 20 and all directions control valve 3,3 ', and no longer need to make all directions control valve 3,3 ' the parts that are communicated with the control mouth of connecting valve of each control mouth, so simplified the structure of connection and connection decontrol.

Below other embodiments are described.

Fig. 8 is the pie graph of the expression embodiment of the invention 2.

In the present embodiment, in each oil pressure pump, be provided with swash plate driving mechanism portion.

In addition, use identical symbol, and omit explanation for the component part identical with embodiment shown in Figure 1.

And, swash plate driving mechanism portion 70 ' structure identical with the structure of swash plate driving mechanism portion 70, swash plate driving mechanism portion 70 ' component parts in, the component parts of additional marking (') is identical with component parts in the swash plate driving mechanism portion 70 on its symbol.Below, be that typical example describes with swash plate driving mechanism portion 70.

Swash plate driving mechanism portion 70 presses Inductance valve (to call " LS valve " in the following text) 71 and auxiliary follow up piston 72 and pressure chamber 73 to constitute by carrying basically.

The valve position of LS valve 71 is equipped with position 71a, position 71b.The control mouth 71c of LS valve 71 is communicated with pipeline 8 by pipeline 75.

Side end at auxiliary follow up piston 72 is provided with spring 74.Form in the end of the opposite side of auxiliary follow up piston 72 and to flow into the pressure chamber 73 that presses oil.And the connecting rod 72a of auxiliary follow up piston 72 is connected with the swash plate 1b of oil pressure pump 1, and the tilt angle of swash plate 1b changes with moving of auxiliary follow up piston 72.

Action to swash plate driving mechanism portion describes below.

The load of hydraulic motor 7 is pressed the control mouth 71c that is fed into LS valve 71 by pipeline 75, and the pump pressure of oil pressure pump 1 is fed into the control mouth 71d of LS valve 71 by pipeline 79.When the pressure difference between them surpassed the pressure of regulation, the valve position of LS valve 71 was to position 71a side shifting.Therefore, press oily P1 to be fed into pressure chamber 73 by pipeline 76, LS valve 71, pipeline 77.Be fed into the 74a of spring housing from the pressure oil of oil pressure pump 1 output by pipeline 79.Compression area at the auxiliary follow up piston 72 of compression chamber 73 1 sides is different with the compression area of the auxiliary follow up piston 72 of the 74a of spring housing side.When the pressure of pressing oily PL surpassed the pressure of the elastic force of spring 74 and the pressure oil that supplies to the 74a of spring housing, auxiliary follow up piston 72 was driven by the direction (the MIN side among the figure) to the capacity minimum that makes oil pressure pump 1.And when pressure difference between the pump pressure of control mouth 71d of LS valve 71 is pressed and supplied to the control mouth 71c load that is supplying to LS valve 71 less than the pressure of regulation, the valve position of LS valve 71 was to position 71b side shifting.At this moment, the pressure oil in the pressure chamber 73 is discharged in the fuel tank 78 by pipeline 77, LS valve 71.So, drive auxiliary follow up piston 72 and move to the direction (the MAX side among the figure) of the capacity minimum that makes oil pressure pump 1.With such method the tilt angle of the swash plate 1b of oil pressure pump 1 is controlled.

In the present embodiment, each hydraulic motor 7,7 ' inflow entrance between be connected or be disengaged connection by connecting valve 20.

Make the vehicle occasion of straight-line travelling forward, supplying with to the control mouth 24 of connecting valve 20 and press oily Pa as the control of communications signals.So, make as the logical hydraulic fluid port 7a of the inflow entrance of hydraulic motor 7 with as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' a of inflow entrance be communicated with.Make the vehicle occasion of straight-line travelling rearward, supplying with to the control mouth 24 of connecting valve 20 and press oily Pa as the control of communications signals.So, make as the logical hydraulic fluid port 7b of the inflow entrance of hydraulic motor 7 with as hydraulic motor 7 ' the logical hydraulic fluid port 7 ' b of inflow entrance be communicated with.In addition, vehicle to the left and right any one party turn to the occasion of travelling, supply with as the pressure oil Pb that is communicated with ring off signals to the control mouth 24 of connecting valve 20.So valve rod 23 right direction in figure moves, and removes the connection between each inflow entrance.

Identical with embodiment 1, by connecting valve 20 is set, can make the pressure oil flow that flows into hydraulic motor 7 with flow into hydraulic motor 7 ' pressure oil flow basic identical.Therefore, make hydraulic motor 7 and hydraulic motor 7 ' formation run-in synchronism.

port

21,22 20 is interior.

As mentioned above, according to present embodiment owing to can dwindle each connecting

port

21,22 20 is interior, thus can constituent ratio embodiment 1 littler connecting valve.And, can dwindle connecting valve 20 and all directions control valve 3,3 ' between pipeline 8,8 '.

In addition, the invention is not restricted to be applied in the building machinery, also can be applied in the winch that uses 2 hydraulic motors etc.

In addition, the present invention is not limited only to hydraulic motor, also is applicable to the occasion of a plurality of oil pressure final controlling element being carried out necessary synchronization motion and asynchronous action switching.

Claims

1. the connection of an oil pressure final controlling element and be communicated with decontrol comprises:

Corresponding to any flows into and press oil as inflow entrance in 2 logical hydraulic fluid ports (7a, 7b), simultaneously in 2 logical hydraulic fluid ports another as outflow opening, flow out and press oil, carry out postive direction running or a plurality of oil pressure final controlling element (7,7 ') of running in the other direction;

Have the 1st direction control mouthful (304,304 ') that is communicated with the logical hydraulic fluid port of a side of above-mentioned oil pressure final controlling element (7,7 ') and the 2nd direction control mouthful (310,310 ') that is communicated with the logical hydraulic fluid port of opposite side of described oil pressure final controlling element (7,7 '), a plurality of direction control mechanisms (3,3 ') of the feeding direction of pressing oil are supplied with in control to described oil pressure final controlling element;

Corresponding communications signals is communicated with each inflow entrance of described a plurality of oil pressure final controlling element (7,7 '), and the means of communication (20) that is communicated with between each inflow entrance of described a plurality of oil pressure final controlling element (7,7 ') is removed in corresponding simultaneously connection ring off signal;

It is characterized in that:

In the connection and connection decontrol of described oil pressure final controlling element, be included in and select a plurality of selection mechanisms (4,4 ') of pressing the direction control mouth of oil to described oil pressure final controlling element (7,7 ') supply in described the 1st direction control mouthful (304,304 ') and the 2nd direction control mouth (310,310 ');

The corresponding communications signals of described means of communication (20) is communicated with all directions control mouths (304,304 ') that chosen by described a plurality of selection mechanisms (4,4 '), and the connection between all directions control mouth that is chosen by described a plurality of selection mechanisms (4,4 ') is removed in corresponding connection ring off signal.

2. the connection of oil pressure final controlling element according to claim 1 and connection decontrol, it is characterized in that, described direction control mechanism (3,3 ') is the position control valve with described selection mechanism (4,4 '), the mobile position of corresponding valve rod (4,4 ') is selected to described oil pressure final controlling element (7,7 ') and is supplied with the direction control mouthful of pressing oil (304,310,304 ', 310 ').

3. the connection of an oil pressure final controlling element and be communicated with decontrol comprises:

Corresponding wantonly 1 in 2 logical hydraulic fluid ports (7a, 7b) flowed into and presses oil as inflow entrance, simultaneously in 2 logical hydraulic fluid ports in addition 1 flow out and press oil as outflow opening, a plurality of oil pressure final controlling element (7,7 ') that carry out the postive direction running or turn round in the other direction;

Have the 1st direction control mouthful (304,304 ') that is communicated with the logical hydraulic fluid port of a side of described oil pressure final controlling element (7,7 ') and the 2nd direction control mouthful (310,310 ') that is communicated with the logical hydraulic fluid port of opposite side of described oil pressure final controlling element (7,7 '), a plurality of direction control mechanisms (3,3 ') of the feeding direction of pressing oil are supplied with in control to described oil pressure final controlling element;

Corresponding communications signals is communicated with each inflow entrance of described a plurality of oil pressure final controlling element (7,7 '), and correspondence is communicated with the means of communication (20) that the connection between each inflow entrance of described a plurality of oil pressure final controlling element (7,7 ') is removed in ring off signal simultaneously;

Oil pressure pump (1,1 ') with a plurality of capacity variable types of the corresponding setting of described oil pressure final controlling element (7,7 ');

A plurality of capacity control mechanisms (70,70 ') of oil pressure pump (1, the 1 ') capacity of the corresponding a plurality of capacity variable types that are provided with of the described oil pressure final controlling element of load pressure-controlled (7,7 ') of corresponding described oil pressure final controlling element (7,7 ');

It is characterized in that:

The corresponding communications signals of described means of communication (20) is communicated with a plurality of direction control mouths (304,304 ') that chosen by described a plurality of selection mechanisms (4,4 '), and the connection between all directions control mouth that is chosen by described a plurality of selection mechanisms (4,4 ') is removed in corresponding connection ring off signal;

The corresponding all directions control confession that is communicated with by described means of communication (20) of described capacity control mechanism (70,70 ') controls the capacity of described oil pressure pump (1,1 ') for the pressure of pressing oil simultaneously.