CN108468781A - A kind of combined type double fluid variable speed drive - Google Patents

A kind of combined type double fluid variable speed drive Download PDF

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Publication number
CN108468781A
CN108468781A CN201810426650.0A CN201810426650A CN108468781A CN 108468781 A CN108468781 A CN 108468781A CN 201810426650 A CN201810426650 A CN 201810426650A CN 108468781 A CN108468781 A CN 108468781A
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China
Prior art keywords
gear
low
low gear
high gear
oil
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CN201810426650.0A
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CN108468781B (en
Inventor
孙保群
侯郭顺
曹文达
杨瑞恒
陈杰峰
施益平
汪韶杰
盛楠
夏光
闫瑞琦
郑友
滑杨莹
郭冬云
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Anhui Zhanpeng Hydraulic Machinery Co Ltd
Hefei University of Technology
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Anhui Zhanpeng Hydraulic Machinery Co Ltd
Hefei University of Technology
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Priority to CN201810426650.0A priority Critical patent/CN108468781B/en
Publication of CN108468781A publication Critical patent/CN108468781A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/06—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type
    • F16H47/08—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type the mechanical gearing being of the type with members having orbital motion

Abstract

A kind of combined type double fluid variable speed drive is mainly made of input transmission module, low gear transfer gear, low gear hydraulic drive module, low gear machine driving module, high gear transfer gear, high gear hydraulic drive module, high gear machine driving module, hydraulic motor, motor output transmission module and output shaft.This programme is to form composite transmission device using shunting split path transmission system in combination in two sets of topping powers, making it both has the characteristics that hydro-mechanical transmission system, the gear shift function of dual-clutch transmission can be realized again, further promote variable speed drive performance.The present invention has the gearshift function of double clutch, it simultaneously can be with three kinds of hydraulic drive, hydro-mechanical transmission and machine driving kind of drive passing powers, transmission process has both hydraulicdriven stepless speed governing characteristic and mechanically operated efficient feature, the use condition requirement complicated and changeable of the driving cycles such as vehicle, especially engineering machinery and agricultural machinery can preferably be met.

Description

A kind of combined type double fluid variable speed drive
Technical field
The invention belongs to vehicle speed variation transmission fields, and in particular to one kind being based on hydraulic-machinery split path transmission, use for reference it is double from Clutch（DCT）The gear principle of speed changer passes through the vehicle being combined to two sets of hydraulic-machinery split path transmission devices Double-current variable speed drive, the characteristics of can not only having realized whether shift process interrupts power, but also have both hydraulic drive, machine driving With advantage, it is suitable for the off roaders such as all kinds of objective, cargo path road haulage vehicles and agricultural equipment, engineering machinery.
Background technology
Since vehicle driving scene is changeable, road conditions are complicated, running speed variation range is big, variable ratio drive system is The indispensable key components of various types of vehicles.Different use purposes and application scenario require vehicle performance different.Mesh It is preceding to have Manual mechanical speed change using internal combustion engine on the vehicle of power, to carry the variable ratio drive system used mainly in the market Device, semi automatic machine formula speed changer（AMT）, power shifting automatic transmission（Fixed shaft type AT）, type rotary shaft automatic transmission （AT）, mechanical stepless automatic transmission（CVT）And double-clutch automatic gearbox（DCT、DSG）Deng although these speed changers Properity is different, but common feature is to transmit power with mechanical drive mode.In a part of engineering machinery, agricultural equipment etc. On the lower off roader of operating rate, to adapt to the requirement of low speed, big load variations, application is also often carried based on quiet Press the hydraulic transformer product of transmission.It is carried using same in addition, also also having on part engineering machinery, agricultural equipment and special vehicle The hydraulic-machinery split path transmission production transmissions of Shi Liyong hydraulic pressure and mechanical two kinds of kinds of drive.
Mechanical gear passes through different gear combinations mainly using gear and shaft element as transmission system component The variation of transmission ratio is formed to meet the requirement to speed changer output rotating speed, torque.On the whole, mechanical gear has The advantages such as structure is relatively easy, transmission efficiency, technical maturity, manufacturing cost are low, but because of its mechanical speed change transport characteristics, with hair The matching of motivation is difficult to reach optimum level always.
Hydraulic transformer generally by the Hydraulic Elements such as hydraulic pump, hydraulic motor, the hydraulic valve of various functions and hydraulic pipeline, Parts form, wherein hydraulic pump is " inverting element " that the mechanical energy of input system is converted to hydraulic energy, hydraulic pressure horse Up to being then " the secondary inverting element " converted hydraulic energy to mechanical energy.The operation principle of hydraulic transformer is：Hydraulic pump will be sent out The mechanical energy of motivation input system is converted to the hydraulic energy that oil liquid pressure and flow are characterization, and liquid is delivered to by hydraulic pipeline After pressure motor, then output converted hydraulic energy to mechanical energy by motor, therefore, during hydraulic drive, indeed through " machine-liquid " and " liquid-machine " energy process is realized twice, when the hydraulic pump or hydraulic motor or two that can be changed using discharge capacity When person's discharge capacity is all variable, by simply adjusting discharge capacity ratio of the hydraulic pump to hydraulic motor, so that it may easily to change system Transmission ratio realizes gear.Hydraulic drive has energy transmission density big, and system composition is simple, light-weight, is easily achieved nothing Pole speed governing, convenient for the features such as carrying out flexibility arrangement on vehicle, but the intrinsic oil liquid leakage and fever of hydraulic drive is asked Topic often results in that hydraulicefficiency is relatively low, while because the working speed relative mechanical of hydraulic pump, hydraulic motor high efficient district passes Dynamic to want low, the adaptability that operating mode is exported to high rotating speed is poor.
Hydraulic-machinery split path transmission is also known as HMT（Hydraulic-Mechanical Transmission）, it is a kind of Mixed drive mode, transport characteristics be on some node of transmission chain by dynamic branch be hydraulic power and mechanical output, Cocurrent exports after being transferred to next node so that hydraulic drive is parallel with mechanical drive mode.In input node, by special The power of input is divided into the hydraulic-machinery split path transmission transmitted backward again after hydraulic pressure and mechanical output by transfer device, referred to as " preceding Set partition type split path transmission "；On output node, by special collector-shoe gear to by a upper node with hydraulic pressure and machinery two kinds The hydraulic-machinery split path transmission that the power that the parallel transmission of mode comes transmits backward again after being converged, referred to as " postposition convergent current type is double It spreads dynamic ".Transfer device is identical as collector-shoe gear structural shape, usually a hydraulic pressure inverting element（Hydraulic pump or hydraulic pressure horse It reaches）Or a hydraulic pressure inverting element is composed with a planetary gear mechanism.Using single hydraulic pressure inverting element as transfer Or when collector-shoe gear, since transfer or confluence are all completed inside hydraulic pressure inverting element, because being referred to herein as " shunting in power " or " work( Confluence in rate " when using a hydraulic pressure inverting element as preposition transfer device, referred to as " shunts split path transmission in topping power System ", and when using a hydraulic pressure inverting element as postposition collector-shoe gear, referred to as " split path transmission system of converging in postposition power System "；With transfer or collector-shoe gear that a hydraulic pressure inverting element and a planetary gear mechanism form, due to transfer or converge all It is completed outside hydraulic pressure inverting element, because referred to herein as " power external shunt " or " power exchange flow ", being changed using a hydraulic pressure When energy element is combined with a planetary mechanism as preposition transfer device, referred to as " topping power external shunt split path transmission system ", And it is combined with a planetary gear mechanism using a hydraulic pressure inverting element when being used as postposition collector-shoe gear, referred to as " postposition power Exchange flow split path transmission system ".Mainly " external shunt " technology, the product for carrying application used currently on the market is existing preposition Power external shunt split path transmission system also has postposition power exchange flow split path transmission system, but there is no into " interior shunting " technology The case of work(application.
Invention content
The present invention provides a kind of combined type double fluid variable speed drive, and the purpose is to double using shunting in two sets of topping powers It spreads dynamic system in combination and forms composite transmission device, making it not only has the characteristics that hydraulic-machinery split path transmission system, but also can It realizes the gear shift function of dual-clutch transmission, further promotes variable speed drive performance.
In order to achieve the above objectives, the technical solution adopted by the present invention is：A kind of combined type double fluid variable speed drive, mainly By input transmission module, low gear transfer gear, low gear hydraulic drive module, low gear machine driving module, high gear transfer gear, high gear liquid Press transmission module, high gear machine driving module, hydraulic motor, motor output transmission module and output shaft composition.
The input transmission module by input shaft, input gear, low gear input gear, low gear input shaft, low gear engaging sleeve, High gear input gear, high gear input shaft and high gear engaging sleeve composition.
In on the shell of the transmission device, the input gear is fixedly arranged on input shaft the input shaft pivoting support, And at the same time being meshed with low gear input gear and high gear input gear.
The low gear input gear tool is there are one central shaft and with central shaft pivoting support on shell；The low gear is defeated Enter axis and low gear input gear is coaxially arranged, the low gear engaging sleeve is sheathed on one end of low gear input shaft and can be inputted along low gear Axis slides axially, and when low gear engaging sleeve slides to low gear input gear side and is combined with low gear input gear, low gear inputs tooth Wheel is formed with low gear input shaft and is sequentially connected, when low gear engaging sleeve slides to the other side, low gear input gear and low gear input shaft Disengage connection.
The high gear input gear tool is there are one central shaft and with central shaft pivoting support on shell；The high gear is defeated Enter axis and high gear input gear is coaxially arranged, the high gear engaging sleeve is sheathed on one end of high gear input shaft and can be inputted along high gear Axis slides axially, and when high gear engaging sleeve slides to high gear input gear side and is combined with high gear input gear, high gear inputs tooth Wheel is formed with high gear input shaft and is sequentially connected, when high gear engaging sleeve slides to the other side, high gear input gear and high gear input shaft Disengage connection.
The low gear transfer gear is mainly made of low gear positive displacement pump, low gear into oil seal and low gear oil extraction sealing, low gear The rotor of positive displacement pump is sequentially connected as the low gear drive end of low gear transfer gear with low gear input shaft, low gear positive displacement pump Stator as low gear transfer gear low gear driven end relative to shell pivoting support；The low gear oil inlet is sealed into one for low gear The rotatory sealing channel of positive displacement pump oil inlet, rotatory sealing channel tool there are one low gear oil inlet fixed port and a low gear into Oil rotation port, low gear oil inlet rotation port connect with the oil inlet of low gear positive displacement pump and are connected to the low of low gear positive displacement pump Chamber is pressed, low gear oil inlet fixed port is as low gear transfer gear oil inlet；The low gear oil extraction is sealed into one for low gear positive displacement The rotatory sealing channel of oil extraction is pumped, there are one low gear oil extraction fixed ports and a low gear oil extraction rotation for rotatory sealing channel tool Port, low gear oil extraction rotation port connect with the oil discharge outlet of low gear positive displacement pump and are connected to the high pressure chest of low gear positive displacement pump, Low gear oil extraction fixed port is as low gear transfer gear oil discharge outlet.
The low gear hydraulic drive module includes low gear check valve, low gear switch valve, low gear throttle valve and low gear check-valves.
The low gear check valve unilaterally connected fuel tank to low gear transfer gear oil inlet direction oil circuit, low gear check valve with it is low It keeps off between transfer gear oil inlet equipped with low gear import confluence.
The low gear switch valve is a bi-bit bi-pass switch valve, and there are one the import of low gear switch valve and one are low for tool Position switch valve outlet, low gear transfer gear oil discharge outlet extend outwardly equipped with oil extraction oil circuit, are first equipped with low gear on the oil extraction oil circuit successively Split point is connected on the oil of the oil extraction between low gear transfer gear oil discharge outlet and low gear split point with confluence, low gear switch valve is equipped with afterwards On the road, low gear switch valve inlet communication low gear transfer gear oil discharge outlet, low gear switch valve outlet low gear split point, when low gear is opened When pass valve is in left position, the oil circuit cut-off of low gear transfer gear oil discharge outlet to low gear split point is low when low gear switch valve is in right position The oil circuit for keeping off transfer gear oil discharge outlet to low gear split point is connected, and the initial position of low gear switch valve is " conducting ".
The low gear throttle valve is an adjustable throttling, and aperture regulation range is " fully closed " to " standard-sized sheet ", low gear There are one the import of low gear throttle valve and a low gear throttling valve outlet, the shuntings of low gear throttle valve inlet communication low gear for throttle valve tool Point, low gear throttle valve outlet low gear import confluence, when low gear throttle valve " fully closed ", low gear split point to low gear into The oil circuit cut-off of mouth confluence, when low gear throttle valve " standard-sized sheet ", the oil circuit of low gear split point to low gear import confluence is complete Conducting, when low gear throttle section is opened, the oil circuit of low gear split point to low gear import confluence is partially ON, and it is led Logical degree increases with the aperture of low gear throttle valve and is increased.
The low gear check-valves is a check valve, and there are one low gear check valve inlet and a low gear check-valves for tool Outlet, the oil circuit of low gear check-valves unilaterally connected low gear split point to confluence direction, low gear check valve inlet are connected to low gear point Flow point, low gear check-valves outlet confluence.
The low gear machine driving module includes low gear driven shaft, low gear driving gear and low gear driven gear；It is described low Driven shaft pivoting support is kept off on shell, low gear driven shaft one end and the low gear driven end of low gear transfer gear are sequentially connected, another End is sequentially connected with low gear driving gear, and low gear driving gear is sequentially connected with low gear driven gear, low gear driven gear and institute State output shaft drive connection.
The high gear transfer gear is mainly made of high gear positive displacement pump, high gear into oil seal and high gear oil extraction sealing, high gear The rotor of positive displacement pump is sequentially connected as the high gear drive end of high gear transfer gear with high gear input shaft, high gear positive displacement pump Stator as high gear transfer gear high gear driven end relative to shell pivoting support；The high gear oil inlet is sealed into one for high gear The rotatory sealing channel of positive displacement pump oil inlet, rotatory sealing channel tool there are one high gear oil inlet fixed port and a high gear into Oil rotation port, high gear oil inlet rotation port connect with the oil inlet of high gear positive displacement pump and are connected to the low of high gear positive displacement pump Chamber is pressed, high gear oil inlet fixed port is as high gear transfer gear oil inlet；The high gear oil extraction is sealed into one for high gear positive displacement The rotatory sealing channel of oil extraction is pumped, there are one high gear oil extraction fixed ports and a high gear oil extraction rotation for rotatory sealing channel tool Port, high gear oil extraction rotation port connect with the oil discharge outlet of high gear positive displacement pump and are connected to the high pressure chest of high gear positive displacement pump, High gear oil extraction fixed port is as high gear transfer gear oil discharge outlet.
The high gear hydraulic drive module includes high gear check valve, high gear switch valve, high gear throttle valve and high flapper valve.
The high gear check valve unilaterally connected fuel tank to high gear transfer gear oil inlet direction oil circuit, high gear check valve with it is high It keeps off between transfer gear oil inlet equipped with high gear import confluence.
The high gear switch valve is a bi-bit bi-pass switch valve, and there are one the import of high gear switch valve and a height for tool Position switch valve outlet, high gear transfer gear oil discharge outlet extend outwardly equipped with oil extraction oil circuit, which is equipped with high gear split point, High gear switch valve is connected on the oil extraction oil circuit between high gear transfer gear oil discharge outlet and high gear split point, and high gear switch valve import connects Logical high gear transfer gear oil discharge outlet, high gear switch valve outlet high gear split point, when high gear switch valve is in left position, high gear point The oil circuit of dynamic device oil discharge outlet to high gear split point ends, when high gear switch valve is in right position, high gear transfer gear oil discharge outlet to high gear The oil circuit of split point is connected, and the initial position of high gear switch valve is " conducting ".
The high gear throttle valve is an adjustable throttling, and aperture regulation range is " fully closed " to " standard-sized sheet ", high gear There are one the import of high gear throttle valve and a high gear throttling valve outlet, the shuntings of high gear throttle valve inlet communication high gear for throttle valve tool Point, high gear throttle valve outlet high gear import confluence, when high gear throttle valve " fully closed ", high gear split point to high gear into The oil circuit cut-off of mouth confluence, when high gear throttle valve " standard-sized sheet ", the oil circuit of high gear split point to high gear import confluence is complete Conducting, when high gear throttle section is opened, the oil circuit of high gear split point to high gear import confluence is partially ON, and it is led Logical degree increases with the aperture of high gear throttle valve and is increased.
The high flapper valve is a check valve, and there are one high gear check valve inlet and a high flapper valves for tool Outlet, the oil circuit of high flapper valve unilaterally connected high gear split point to confluence direction, high gear check valve inlet are connected to high gear point Flow point, high flapper valve outlet confluence.
The high gear machine driving module includes high gear driven shaft, high gear driving gear and high gear driven gear；The height Driven shaft pivoting support is kept off on shell, high gear driven shaft one end and the high gear driven end of high gear transfer gear are sequentially connected, another End is sequentially connected with high gear driving gear, and high gear driving gear is sequentially connected with high gear driven gear, high gear driven gear and institute State output shaft drive connection.
The hydraulic motor is that a positive displacement becomes displacement hydraulic motor, and stator is fixedly arranged on shell, hydraulic motor tool There are oil inlet and oil discharge outlet, the oil inlet of the confluence connection hydraulic motor, the oil discharge outlet of hydraulic motor to be connected to fuel tank.
The motor output transmission module includes freewheel clutch, motor drive shaft, motor driving gear and motor driven gear.
The freewheel clutch has the characteristic of unidirectional delivery power, is equipped with drive end and driven end, freewheel clutch Drive end and motor drive shaft be sequentially connected, on shell, the rotor transmission of motor drive shaft and hydraulic motor connects motor drive shaft pivoting support It connects, the driven end of freewheel clutch is fixedly arranged on motor driving gear, when hydraulic motor exports rotating speed and this is defeated by motor drive shaft When going out rotating speed has the trend more than motor driving gear rotating speed, freewheel clutch combines, and the power of hydraulic motor passes to horse Up to driving gear, when the rotating speed of motor drive shaft is less than motor driving gear rotating speed, freewheel clutch detaches and interrupts motor axial direction Motor driving gear passing power；The motor driving gear is meshed with motor driven gear, motor driven gear with it is described Output shaft is sequentially connected, and the output shaft pivoting support is on shell.
The relevant technologies content of above-mentioned technical proposal is explained as follows：
1. it is shown in Figure 1 in said program, since the low gear transfer gear FD1 is a positive displacement pump, low gear drive end IM1 is the rotor of the positive displacement pump and is sequentially connected with low gear input shaft IZ1 that low gear driven end DM1 is positive displacement pump Stator and the one end for being fixedly arranged on low gear driven shaft DZ1, low gear drive end IM1 and low gear driven end DM1 can be same relative to shell KT Step rotation or differential rotation, therefore, low gear transfer gear FD1 has speed discrepancy in low gear drive end IM1 and low gear driven end DM1 When, you can generate the effect of suction fluid.During low gear transfer gear FD1 suction fluid, the oil liquid pressure of discharge is 0 When, FD1 output hydraulic pressure flow of low gear transfer gear but hydraulic power output is not formed, while also without mechanical power output, at this time Low gear transfer gear FD1 does not have transmission and transfer function, and such state is equivalent to " separation " operating mode of clutch；When the oil of discharge When hydraulic coupling is not 0, low gear transfer gear FD1 output hydraulic pressure power, meanwhile, the oil liquid pressure in internal closing working chamber transmits Low gear driven end DM1 can be made to generate torque with respect to low gear driven shaft DZ1 to low gear driven end DM1, when low gear driven shaft DZ1 revolves Mechanical output output is formed when turning, and thus realizes " transfer " function of low gear transfer gear FD1；As low gear transfer gear FD1 Oil discharge outlet cut-off when its can be made to generate stall, so that low gear drive end IM1 and low gear driven end DM1 is rotated synchronously, low gear transfer Device FD1 loses transfer effect, and low gear driven end DM1, such state phase are all transmitted to by the power of low gear drive end IM1 inputs When in " engagement " operating mode of clutch.It can be seen that low gear transfer gear FD1 has " clutch separation ", " transfer " and " clutch Three kinds of functions of engagement ".Similarly, high gear transfer gear FD2 also has function identical with low gear transfer gear FD1.Low gear of the present invention point The principle and structure of dynamic device FD1 and high gear transfer gear FD2 may refer to the dynamic branch device in Chinese patent CN106838196A.
2. shown in Figure 1 in said program, the freewheel clutch SC in the motor output transmission module has unidirectionally The characteristics of transmitting rotating speed and torque.In the present invention, drive end and the motor drive shaft MZ of freewheel clutch SC are sequentially connected, and driven end is solid It is more than horse when hydraulic motor HM has by motor drive shaft MZ output rotating speeds and the output rotating speed on motor driving gear Cm1 Up to driving gear Cm1 rotating speeds trend when, freewheel clutch SC is combined, and the power of hydraulic motor HM is passed to horse by motor drive shaft MZ Up to driving gear Cm1；When the rotating speed of motor drive shaft MZ is less than motor driving gear Cm1 rotating speeds, in freewheel clutch SC separation simultaneously Disconnected motor drive shaft MZ is to motor driving gear Cm1 passing powers, in this way, can be to avoid mechanical output back transfer to hydraulic drive mould Power cycle caused by block and transmission loss.In addition, when low gear transfer gear FD1 or high gear transfer gear FD2 are in transfer state, In one timing of flow, the size for the hydraulic power and mechanical output that transfer exports and the oil liquid pressure height for being supplied to hydraulic motor HM It is low directly proportional, and oil liquid pressure height is directly proportional to suffered drag torque size on hydraulic motor axis MZ.The present invention passes When dynamic device work, when working resistance suffered on output shaft OZ changes in a certain range, due to freewheel clutch SC Single-direction transmission characteristic, the oil pressure height that can be automatically adjusted by own system on hydraulic drive path be such that output rotating speed No ties up Hold it is constant, therefore, the setting of freewheel clutch SC, make split path transmission device have " pressure adaptive adjusting " characteristic.
3. it is shown in Figure 1 in said program, because the low gear transfer gear FD1 and high gear transfer gear FD2 is using quantitative Pump, hydraulic motor HM use positive displacement variable displacement motor, when system is operated in split path transmission state, pass through step-less adjustment hydraulic motor HM discharge capacities, you can change hydraulic drive ratios of the low gear transfer gear FD1 or high gear transfer gear FD2 to hydraulic motor HM, to one Determine to realize the step-less adjustment to split path transmission device resultant gear ratio in range.
4. shown in Figure 1 in said program, the effect of the low gear throttle valve VD1 is control low gear transfer gear FD1 Operating pressure, while low gear transfer gear fuel supply flow rate Qd1 and the reflux of hydraulic motor HM are conveyed to the f1 shuntings of low gear split point Low gear transfer gear regurgitant volume Qh1 to low gear transfer gear oil inlet a1 is adjusted.Low gear drive end IM1 it is dynamic input simultaneously And in the case that low gear drive end IM1 and low gear driven end DM1 have speed discrepancy, when low gear throttle valve VD1 " standard-sized sheet ", low gear point Dynamic device oil discharge outlet b1 and low gear transfer gear oil inlet a1 is fully on, and liquid flowing resistance can be considered 0, low gear transfer gear oil discharge outlet b1 The fluid of discharge all flows back into low gear transfer gear oil inlet a1, low gear transfer gear FD1, can not because that cannot establish oil pressure inside it It realizes transmission and is in the state similar to clutch " separation ".In low gear throttle valve VD1 from " standard-sized sheet " to " fully closed " adjustment process In, restriction effect, which gradually increases, causes the oil pressure at low gear split point f1 and the oil pressure in low gear transfer gear FD1 to synchronize raising And low gear check-valves VS3 is made to open, after the fluid arrival low gear split point f1 of low gear transfer gear FD1 discharges, a part is with low gear Transfer gear regurgitant volume Qh1 is back to low gear transfer gear oil inlet a1, and another part is then through low gear check-valves VS3 with low gear transfer gear Fuel supply flow rate Qd1 is conveyed to hydraulic motor HM, while driving the rotor of hydraulic motor HM to rotate and exporting horse by motor drive shaft MZ Up to rotating speed Nm and motor drive shaft torque M m, at the same time, low gear driven end DM1 also by low gear driven shaft DZ1 export low gear from Moving axis rotating speed No1 and low gear driven shaft torque M o1, because low gear transfer gear regurgitant volume Qh1 is not 0 in the process so that low gear Transfer gear FD1 is in the state of similar clutch " semi-linkage ".When low gear throttle valve VD1 reaches " fully closed ", low gear transfer gear Regurgitant volume Qh1 is 0, and the low gear transfer gear fuel supply flow rate Qd1 for being conveyed to hydraulic motor HM reaches maximum, low gear transfer gear FD1 In " full transfer " state.Under low gear transfer gear FD1 " full transfer " state, low gear switch valve VC1 is moved to a left side by its right side Position can make low gear transfer gear FD1 form stall, lose transfer effect and be in the state similar to clutch " engagement ".Similarly, exist It is high in the case that the dynamic inputs of high gear drive end IM2 and high gear drive end IM2 and high gear driven end DM2 have speed discrepancy Throttle valve VD2 " standard-sized sheet " is kept off, when from " standard-sized sheet " to " fully closed " adjust with " fully closed ", high gear transfer gear FD2 can also located respectively In " separation ", " semi-linkage " and " full transfer " state, by high gear switch valve under " full transfer " state of high gear transfer gear FD2 VC2 is moved to left position by its right side, and high gear transfer gear FD2 can be made to be in " engagement " state, high gear driven end DM2 accordingly also by High gear driven shaft DZ2 exports high gear output speed No2 and high gear driven shaft torque M o2.
5. shown in Figure 1 in said program, low gear transfer gear FD1 is in " full transfer " state and to hydraulic motor HM When discharge pressure fluid, being gradually reduced motor displacement can make motor rotating speed Nm raisings, motor drive shaft torque M m reduce, but work as motor When discharge capacity is adjusted to 0, because pressure oil liquid can not pass through hydraulic motor HM so that motor rotating speed Nm, motor drive shaft torque M m are all 0, meanwhile, low gear transfer gear FD1 forms stall due to that can not export fluid, loses transfer and acts on and enter " engagement " state. Similarly, in high gear transfer gear FD2 " full transfer " state is in and when to hydraulic motor HM discharge pressure fluid, by motor displacement tune It saves to 0, high gear transfer gear FD2 also enters " engagement " state.
6. it is shown in Figure 1 in said program, when changing to high gear by low gear, " engagement " is in low gear transfer gear FD1 When low gear direct-drive state under, realized by changing to high gear split path transmission state, specific practice is：Low gear is in direct When drive state, low gear engaging sleeve SS1 " engagement ", low gear switch valve VC1 " cut-off ", low gear throttle valve VD1 " fully closed ", low gear point Dynamic device FD1 stalls, freewheel clutch SC separation, the power inputted by input shaft IZ（That is input speed Ni and input torque Mi）Through Input gear Ci, low gear input gear C11, low gear engaging sleeve SS1, low gear input shaft IZ1, low gear transfer gear FD1, low gear are driven Axis DZ1, low gear driving gear C12, low gear driven gear C13 are transmitted to output system after output shaft OZ.When starting to change to high gear, High gear switch valve VC2 " conducting ", high gear throttle valve VD2 " standard-sized sheet ", hydraulic motor HM are adjusted to maximum pump discharge, engagement high gear engagement SS2 is covered, the power inputted by input shaft IZ is inputted through input gear Ci, high gear input gear C21, high gear engaging sleeve SS2, high gear Axis IZ2 driving high gear drive end IM2 rotations, because of rotating speed No2=No1 × i2 ÷ i1 of high gear driven end DM2 at this time, high gear master Moved end IM2 rotates the rotating speed official post high gear transfer gear FD2 suckings formed between high gear driven end DM2 and discharge fluid.Gradually The oil liquid pressure that the aperture for reducing high gear throttle valve VD2 makes high gear transfer gear FD2 be discharged gradually rises, when the oil pressure reaches high gear High flapper valve VS4 conductings when the Opening pressure of check-valves VS4, the fluid of a part of high gear transfer gear FD2 discharges is through high block It returns valve VS4 and is conveyed to hydraulic motor HM, reduce after hydraulic motor HM discharge capacities make freewheel clutch SC engage, further decrease high gear The aperture of throttle valve VD2 makes high gear transfer gear FD2 operating oil pressures continue to increase and formed to carry out split path transmission to output shaft OZ, this When, the power inputted by input shaft IZ a, part passes to output shaft OZ by low gear transfer gear FD1 in a manner of direct-drive, Another part passes to output shaft OZ by high gear transfer gear FD2 in a manner of split path transmission, with the aperture of high gear throttle valve VD2 It further decreases, the accounting by high gear transfer gear FD2 passing powers is bigger, and passes through low gear transfer gear FD1 passing powers Accounting is then smaller, and since low gear transfer gear FD1 is in " engagement " state, the size for transmitting power is proportional to transfer gear interior oil Pressure, when it is 0 that it, which transmits power, internal oil pressure is also 0, and institute is dynamic all by high gear transfer gear FD2 in a manner of split path transmission It transmits, at this point, making low gear switch valve VC1 " conducting ", low gear engaging sleeve SS1 interrupting input axis IZ are to low gear transfer gear FD1 for separation Drive path, system is to complete conversion from from low gear to high gear.
In said program, when being converted from high gear to low gear, when high gear transfer gear FD2 is operated in split path transmission state, connect After closing low gear engaging sleeve SS1, while the aperture for increasing hydraulic motor HM discharge capacities and high gear throttle valve VD2 makes under output shaft OZ rotating speeds Drop, until when the rotating speed of low gear driven end DM1 is No1=No2 × i1 ÷ i2, low gear switch valve VC1 " cut-off " makes low gear transfer Oil pressure is begun setting up inside device FD1, the power that a part is inputted by input shaft IZ begins through low gear transfer gear FD1 directly to pass Flowing mode passes to output shaft OZ, and as the aperture of high gear throttle valve VD2 continues to increase, low gear transfer gear FD1 internal oil pressures are not It is disconnected to increase, it is also continuously increased by the accounting of low gear transfer gear FD1 passing powers, and pass through high gear transfer gear FD2 passing powers Accounting then constantly reduce, when the aperture of high gear throttle valve VD2 reaches " standard-sized sheet ", high gear transfer gear FD2 passing powers account for Than being reduced to 0, whole power are all transmitted by low gear transfer gear FD1, at this point, IZ pairs of separation high gear engaging sleeve SS2 interrupting inputs axis The drive path of high gear transfer gear FD2, system are the conversion completed from high gear to low gear.
By adopting the above-described technical solution, the advantageous effects of the present invention embody in the following areas：
1. combined type double fluid variable speed drive according to the present invention uses for reference double-clutch speed changer principle, by two sets of hydraulic pressure- Mechanical split path transmission system is complex as set of system, and power may be implemented and do not interrupt shift, advantageously ensure that in shift process It is driven continuity and smooth gear shifting, improves shift quality.
2. combined type double fluid variable speed drive according to the present invention, can rotate integrally using relative to system casing Volume-type hydraulic pump as transfer gear, the transfer device constituted is combined with planetary mechanism relative to existing hydraulic pump, there is knot Structure is simple, is convenient for the features such as driveline arrangement, advantageously reduces system manufacturing cost.
3. combined type double fluid variable speed drive according to the present invention, by each engaging sleeve, switch valve, throttle valve Controls different with hydraulic motor displacement progress, you can realize the work(such as interruption transmission, starting, acceleration and the shift of variable speed drive Energy.
In short, combined type double fluid variable speed drive of the present invention, the gearshift function with double clutch, while can be with hydraulic pressure Three kinds of transmission, hydraulic-machinery split path transmission and machine driving kind of drive passing powers, transmission process have both hydraulicdriven nothing Grade governor control characteristics and mechanically operated efficient feature, can preferably meet vehicle, especially engineering machinery and agricultural machinery The use condition requirement complicated and changeable of equal driving cycles.
Description of the drawings
Fig. 1 is a kind of combined type double fluid variable speed drive principle schematic diagram of the present invention.
Reference numeral：A1. low gear transfer gear oil inlet；A2. high gear transfer gear oil inlet；Ac1. low gear switch valve import； Ac2. high gear switch valve import；Ad1. low gear throttle valve import；Ad2. high gear throttle valve import；As3. low gear check valve inlet； As4. high gear check valve inlet；B1. low gear transfer gear oil discharge outlet；B2. high gear transfer gear oil discharge outlet；Bc1. low gear switch valve goes out Mouthful；Bc2. high gear switchs valve outlet；Bd1. low gear throttling valve outlet；Bd2. high gear throttling valve outlet；Bs3. low gear check-valves goes out Mouthful；Bs4. high flapper valve outlet；Ci. input gear；C11. low gear input gear；C12. low gear driving gear；C13. low gear Driven gear；C21. high gear input gear；C22. high gear driving gear；C23. high gear driven gear；Cm1. motor driving gear； Cm2. motor driven gear；DM1. low gear driven end；DM2. high gear driven end；DZ1. low gear driven shaft；DZ2. high gear driven shaft； FD1. low gear transfer gear；FD2. high gear transfer gear；F1. low gear split point；F2. high gear split point；HM. hydraulic motor；IZ. defeated Enter axis；IM1. low gear drive end；IM2. high gear drive end；IZ1. low gear input shaft；IZ2. high gear input shaft；I1. low gear is driven Than；I2. high gear transmission ratio；Im. motor exports transmission ratio；J1. low gear import confluence；J2. high gear import confluence；KT. shell Body；Mi. input torque；Mo1. the driven shaft torque of low gear；Mo2. the driven shaft torque of high gear；MZ. motor drive shaft；Mm. motor shaft torque； Mo. output torque；Ni. input speed；No1. low gear output speed；No2. high gear output speed；Nm. motor rotating speed； No. rotating speed is exported；OZ. output shaft；P. confluence；Qd1. low gear transfer gear fuel supply flow rate；Qd2. high gear transfer gear fuel supply flow rate； Qh1. low gear transfer gear regurgitant volume；Qh2. high gear transfer gear regurgitant volume；Sa1. low gear is into oil seal；Sa2. high gear is into oil seal； Sb1. low gear oil extraction seals；Sb2. high gear oil extraction seals；SC. freewheel clutch；SS1. low gear engaging sleeve；SS2. high gear engages Set；VC1. low gear switch valve；VC2. high gear switch valve；VD1. low gear throttle valve；VD2. high gear throttle valve；VS1. low gear is unidirectional Valve；VS2. high gear check valve；VS3. low gear check-valves；VS4. high flapper valve；T. fuel tank.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment：
Embodiment：A kind of combined type double fluid variable speed drive
Described in Fig. 1, the device is mainly by input transmission module, low gear transfer gear FD1, low gear hydraulic drive module, low gear Machine driving module, high gear transfer gear FD2, high gear hydraulic drive module, high gear machine driving module, hydraulic motor HM, motor Export transmission module and output shaft OZ compositions.
The input transmission module by input shaft IZ, input gear Ci, low gear input gear C11, low gear input shaft IZ1, Low gear engaging sleeve SS1, high gear input gear C21, high gear input shaft IZ2 and high gear engaging sleeve SS2 compositions.
For the input shaft IZ pivoting supports on the shell KT of the transmission device, the input gear Ci is fixedly arranged on input One end of axis IZ, and at the same time being meshed with low gear input gear C11 and high gear input gear C21.
The low gear input gear C11 tools are there are one central shaft and with central shaft pivoting support on shell KT；It is described Low gear input shaft IZ1 and low gear input gear C11 are coaxially arranged, and the low gear engaging sleeve SS1 is sheathed on low gear input shaft IZ1's One end can simultaneously slide axially along low gear input shaft IZ1, when low gear engaging sleeve SS1 slide to the low gear sides input gear C11 and with it is low When keeping off input gear C11 combinations, low gear input gear C11 is formed with low gear input shaft IZ1 and is sequentially connected, when low gear engaging sleeve When SS1 slides to the other side, low gear input gear C11 is disengaged with low gear input shaft IZ1 and is connected.
The high gear input gear C21 tools are there are one central shaft and with central shaft pivoting support on shell KT；It is described High gear input shaft IZ2 and high gear input gear C21 are coaxially arranged, and the high gear engaging sleeve SS2 is sheathed on high gear input shaft IZ2's One end can simultaneously slide axially along high gear input shaft IZ2, when high gear engaging sleeve SS2 slide to the high gear sides input gear C21 and with height When keeping off input gear C21 combinations, high gear input gear C21 is formed with high gear input shaft IZ2 and is sequentially connected, when high gear engaging sleeve When SS2 slides to the other side, high gear input gear C21 is disengaged with high gear input shaft IZ2 and is connected.
The low gear transfer gear FD1 mainly seals Sb1 by low gear positive displacement pump, low gear into oil seal Sa1 and low gear oil extraction The rotor of composition, low gear positive displacement pump connects as the low gear drive end IM1 of low gear transfer gear FD1 with the IZ1 transmissions of low gear input shaft Connect, the stator of low gear positive displacement pump as low gear transfer gear FD1 low gear driven end DM1 relative to shell KT pivoting supports； The low gear is a rotatory sealing channel for low gear positive displacement pump oil inlet into oil seal Sa1, which has One low gear oil inlet fixed port and low gear oil inlet rotate port, low gear oil inlet rotate port and low gear positive displacement pump into Hydraulic fluid port connects and is connected to the low pressure chamber of low gear positive displacement pump, and low gear oil inlet fixed port is as low gear transfer gear oil inlet a1； The low gear oil extraction sealing Sb1 is a rotatory sealing channel for low gear positive displacement pump oil extraction, which has One low gear oil extraction fixed port and a low gear oil extraction rotate port, and low gear oil extraction rotates the row of port and low gear positive displacement pump Hydraulic fluid port connects and is connected to the high pressure chest of low gear positive displacement pump, and low gear oil extraction fixed port is as low gear transfer gear oil discharge outlet b1.
The low gear hydraulic drive module includes low gear check valve VS1, low gear switch valve VC1, low gear throttle valve VD1 and low Flapper valve VS3.
For the low gear check valve VS1 unilaterally connected fuel tank T to the oil circuit in the directions low gear transfer gear oil inlet a1, low gear is unidirectional Low gear import confluence j1 is equipped between valve VS1 and low gear transfer gear oil inlet a1.
The low gear switch valve VC1 is a bi-bit bi-pass switch valve, and have there are one low gear switch valve import ac1 and One low gear switchs valve outlet bc1, and low gear transfer gear oil discharge outlet b1 extends outwardly equipped with oil extraction oil circuit, on the oil extraction oil circuit successively It is first equipped with low gear split point f1 and is equipped with confluence p afterwards, low gear switch valve VC1 is connected on low gear transfer gear oil discharge outlet b1 and low gear On oil extraction oil circuit between split point f1, low gear switch valve import ac1 is connected to low gear transfer gear oil discharge outlet b1, and low gear switch valve goes out Mouth bc1 is connected to low gear split point f1, and when low gear switch valve VC1 is in left position, low gear transfer gear oil discharge outlet b1 to low gear is shunted The oil circuit of point f1 ends, when low gear switch valve VC1 is in right position, the oil circuit of low gear transfer gear oil discharge outlet b1 to low gear split point f1 The initial position of conducting, low gear switch valve VC1 is " conducting ".
The low gear throttle valve VD1 is an adjustable throttling, and aperture regulation range is " fully closed " to " standard-sized sheet ", low Keeping off throttle valve VD1 tools, there are one low gear throttle valve import ad1 and low gear throttling a valve outlet bd1, low gear throttle valve import ad1 It is connected to low gear split point f1, low gear throttling valve outlet bd1 is connected to low gear import confluence j1, as low gear throttle valve VD1 " fully closed " When, the oil circuit cut-off of low gear split point f1 to low gear import confluence j1, when low gear throttle valve VD1 " standard-sized sheet ", low gear shunting The oil circuit of point f1 to low gear import confluence j1 are fully on, and when the parts low gear throttle valve VD1 are opened, low gear split point f1 is arrived The oil circuit of low gear import confluence j1 is partially ON, and it is connected degree and increases with the aperture of low gear throttle valve VD1 and increase.
The low gear check-valves VS3 is a check valve, and there are one low gear check valve inlet as3 and a low gears for tool Non-return valve outlet bs3, low gear check-valves VS3 unilaterally connecteds low gear split point f1 to the oil circuit in the confluence directions p, low gear check-valves Import as3 is connected to low gear split point f1, and low gear non-return valve outlet bs3 is connected to confluence p.
The low gear machine driving module includes low gear driven shaft DZ1, low gear driving gear C12 and low gear driven gear C13；For the low gear driven shaft DZ1 pivoting supports on shell KT, low gear one end driven shaft DZ1 is low with low gear transfer gear FD1's It keeps off driven end DM1 to be sequentially connected, the other end is sequentially connected with low gear driving gear C12, and low gear driving gear C12 and low gear are driven Gear C 13 is meshed, and low gear driving gear C12 is i1, low gear driven gear to the low gear transmission ratio of low gear driven gear C13 The C13 and output shaft OZ is sequentially connected.
The high gear transfer gear FD2 mainly seals Sb2 by high gear positive displacement pump, high gear into oil seal Sa2 and high gear oil extraction The rotor of composition, high gear positive displacement pump connects as the high gear drive end IM2 of high gear transfer gear FD2 with the IZ2 transmissions of high gear input shaft Connect, the stator of high gear positive displacement pump as high gear transfer gear FD2 high gear driven end DM2 relative to shell KT pivoting supports； The high gear is a rotatory sealing channel for high gear positive displacement pump oil inlet into oil seal Sa2, which has One high gear oil inlet fixed port and high gear oil inlet rotate port, high gear oil inlet rotate port and high gear positive displacement pump into Hydraulic fluid port connects and is connected to the low pressure chamber of high gear positive displacement pump, and high gear oil inlet fixed port is as high gear transfer gear oil inlet a2； The high gear oil extraction sealing Sb2 is a rotatory sealing channel for high gear positive displacement pump oil extraction, which has One high gear oil extraction fixed port and a high gear oil extraction rotate port, and high gear oil extraction rotates the row of port and high gear positive displacement pump Hydraulic fluid port connects and is connected to the high pressure chest of high gear positive displacement pump, and high gear oil extraction fixed port is as high gear transfer gear oil discharge outlet b2.
The high gear hydraulic drive module includes high gear check valve VS2, high gear switch valve VC2, high gear throttle valve VD2 and height Flapper valve VS4.
For the high gear check valve VS2 unilaterally connected fuel tank T to the oil circuit in the directions high gear transfer gear oil inlet a2, high gear is unidirectional High gear import confluence j2 is equipped between valve VS2 and high gear transfer gear oil inlet a2.
The high gear switch valve VC2 is a bi-bit bi-pass switch valve, and have there are one high gear switch valve import ac2 and One high gear switchs valve outlet bc2, and high gear transfer gear oil discharge outlet b2 extends outwardly equipped with oil extraction oil circuit, which is equipped with High gear split point f2, high gear switch valve VC2 are connected on the oil of the oil extraction between high gear transfer gear oil discharge outlet b2 and high gear split point f2 On the road, high gear switch valve import ac2 is connected to high gear transfer gear oil discharge outlet b2, and high gear switchs valve outlet bc2 and is connected to high gear split point F2, when high gear switch valve VC2 is in left position, the oil circuit of high gear transfer gear oil discharge outlet b2 to high gear split point f2 ends, high gear When switch valve VC2 is in right position, the oil circuit of high gear transfer gear oil discharge outlet b2 to high gear split point f2 is connected, high gear switch valve VC2 Initial position be " conducting ".
The high gear throttle valve VD2 is an adjustable throttling, and aperture regulation range is " fully closed " to " standard-sized sheet ", high Keeping off throttle valve VD2 tools, there are one high gear throttle valve import ad2 and high gear throttling a valve outlet bd2, high gear throttle valve import ad2 It is connected to high gear split point f2, high gear throttling valve outlet bd2 is connected to high gear import confluence j2, as high gear throttle valve VD2 " fully closed " When, the oil circuit cut-off of high gear split point f2 to high gear import confluence j2, when high gear throttle valve VD2 " standard-sized sheet ", high gear shunting The oil circuit of point f2 to high gear import confluence j2 are fully on, and when the parts high gear throttle valve VD2 are opened, high gear split point f2 is arrived The oil circuit of high gear import confluence j2 is partially ON, and it is connected degree and increases with the aperture of high gear throttle valve VD2 and increase.
The high flapper valve VS4 is a check valve, and there are one high gear check valve inlet as4 and a high gears for tool Non-return valve outlet bs4, high flapper valve VS4 unilaterally connecteds high gear split point f2 to the oil circuit in the confluence directions p, high flapper valve Import as4 connection high gear split points f2, high flapper valve outlet bs4 are connected to confluence p.
The high gear machine driving module includes high gear driven shaft DZ2, high gear driving gear C22 and high gear driven gear C23；The high gear driven shaft DZ2 pivoting supports are on shell KT, the height of high gear one end driven shaft DZ2 and high gear transfer gear FD2 It keeps off driven end DM2 to be sequentially connected, the other end is sequentially connected with high gear driving gear C22, and high gear driving gear C22 and high gear are driven Gear C 23 is meshed, and high gear driving gear C22 is i2, high gear driven gear to the high gear transmission ratio of high gear driven gear C23 The C23 and output shaft OZ is sequentially connected.
The hydraulic motor HM is that a positive displacement becomes displacement hydraulic motor, and stator is fixedly arranged on shell KT, hydraulic pressure horse Up to HM there is oil inlet and oil discharge outlet, the oil inlet of the confluence p connection hydraulic motors HM, the oil discharge outlet of hydraulic motor HM to connect Logical fuel tank T.
Motor output transmission module include freewheel clutch SC, motor drive shaft MZ, motor driving gear Cm1 and motor from Moving gear Cm2.
The freewheel clutch SC has the characteristic of unidirectional delivery power, is equipped with drive end and driven end, overdrive clutch The drive end of device SC is sequentially connected with motor drive shaft MZ, and motor drive shaft MZ pivoting supports are on shell KT, motor drive shaft MZ and hydraulic motor The rotor of HM is sequentially connected, and the driven end of freewheel clutch SC is fixedly arranged on motor driving gear Cm1, when hydraulic motor HM passes through Motor drive shaft MZ output rotating speed and when the output rotating speed has the trend more than motor driving gear Cm1 rotating speeds, freewheel clutch SC In conjunction with the power of hydraulic motor HM passes to motor driving gear Cm1, when the rotating speed of motor drive shaft MZ is less than motor driving gear When Cm1 rotating speeds, freewheel clutch SC is detached and is interrupted motor drive shaft MZ to motor driving gear Cm1 passing powers；The motor master Moving gear Cm1 is meshed with motor driven gear C m2, and motor driving gear Cm1 exports the motor of motor driven gear C m2 Transmission ratio is that im, motor driven gear C m2 and the output shaft OZ are sequentially connected, and the output shaft OZ pivoting supports are in shell KT On.
The operation principle of the present embodiment is as follows：
Shown in Figure 1, a kind of original state of combined type double fluid variable speed drive of the present invention is：Low gear engaging sleeve SS1 and High gear engaging sleeve SS2 all " is detached ", and low gear switch valve VC1 and high gear switch valve VC2 all " are connected ", low gear throttle valve VD1 and height Keep off throttle valve VD2 all " standard-sized sheet ", hydraulic motor HM discharge capacities are adjusted to " maximum ".When the present invention is applied in vehicle drive system, It is as follows to the detailed process of power transmission control：
1. vehicle neutral gear
Maintain the original state of variable speed drive that vehicle neutral gear can be realized, still, to be conducive to subsequent vehicle driveaway operation, Can first engage low gear engaging sleeve SS1, allow the power inputted by input shaft IZ through input gear Ci, low gear input gear C11, Low gear engaging sleeve SS1 and low gear input shaft IZ1 is transmitted to low gear drive end IM1, low gear transfer gear FD1 suckings and discharge fluid, Since low gear switch valve VC1 " conducting ", low gear throttle valve VD1 " standard-sized sheet ", the fluid of low gear transfer gear FD1 discharges all pass through at this time Low gear switch valve VC1, low gear throttle valve VD1 are back to low gear transfer gear oil inlet a1, since low gear transfer gear FD1 can not be at it Inside establishes oil pressure and is in " separation " state, thus not passing power and form neutral gear.
2. vehicle start
Under normal conditions, when vehicle is started to walk with low gear, in " engagement ", low gear transfer gear FD1 suckings and row of low gear engaging sleeve SS1 Go out in the state of fluid, be gradually reduced the aperture of low gear throttle valve VD1, oil pressure is gradually built up inside low gear transfer gear FD1 and incites somebody to action Pressure oil liquid is delivered to low gear split point f1, when oil pressure reaches the Opening pressure of low gear check-valves VS3, low gear check-valves VS3 The pressure oil liquid of conducting, the FD1 outputs of low gear transfer gear is shunted through low gear split point f1, and a part of pressure oil liquid is still through low gear section Stream valve VD1 is back to low gear transfer gear oil inlet a1, and another part pressure oil liquid is then conveyed to hydraulic pressure horse through low gear check-valves VS3 Up to HM, and motor shaft MZ forms motor drive shaft torque M m and rotation trend, at this time motor driving gear Cm1, motor driven tooth The rotating speed for taking turns Cm2 and output shaft OZ is all 0, and freewheel clutch SC " engagement ", motor drive shaft torque M m and rotating speed trend are through motor master Moving gear Cm1, motor driven gear C m2 and freewheel clutch SC pass to output shaft OZ, at the same time, in low gear transfer gear Under the effect of FD1 internal pressure fluid, low gear driven end DM1 is to the low gear driven shaft DZ1 low gear driven shaft torque M o1 formed and makes Low gear driven shaft DZ1 generates rotation trend, and low gear driven shaft torque M o1 is through low gear driving gear C12, low gear driven gear C13 After passing to output shaft OZ, the torque with the HM outputs of aforementioned hydraulic motor forms output torque Mo after converging to output shaft OZ, with It low gear throttle valve VD1 apertures to continue to reduce, output torque Mo persistently increases, when output torque Mo increases are enough that vehicle is overcome to rise Vehicle starts to start to walk when walking resistance, and when low gear throttle valve VD1 reaches " fully closed ", vehicle completes starting, and variable speed drive is in Hydraulic-machinery split path transmission state.
3. vehicle accelerates
After vehicle completes starting, variable speed drive is in hydraulic-machinery split path transmission state, and following methods can all make vehicle Accelerate：Method one is to maintain hydraulic motor HM discharge capacities constant, continues to increase power input；Method is second is that continue to increase power defeated Enter, while reducing hydraulic motor HM discharge capacities；Method three is to maintain power input constant, persistently reduces hydraulic motor HM discharge capacities.
In method two and method three, since the motor rotating speed Nm of motor drive shaft MZ is low gear transfer gear fuel supply flow rate Qd1 The ratio between with hydraulic motor HM discharge capacities（That is Nm=Qd1/ hydraulic motor displacements）, therefore, no matter low gear transfer gear FD1 is supplied to hydraulic pressure Whether the low gear transfer gear fuel supply flow rate Qd1 of motor HM changes, as long as reducing hydraulic motor HM discharge capacities and maintaining Nm always >=No × im, so that it may which, to ensure that freewheel clutch SC " is engaged " always, variable speed drive is in hydraulic-machinery split path transmission state Under output rotating speed No continue to increase vehicle made to accelerate.
Under hydraulic-machinery split path transmission state, when hydraulic motor HM discharge capacities are adjusted to 0, low gear transfer gear FD1 is because stifled Transfer " engagement ", variable speed drive is transferred to direct-drive state, vehicle can only be made to add in a manner of increasing power input at this time Speed.
4. low gear change up
High gear is changed to by low gear, by being realized by changing to high gear split path transmission state under low direct-drive state, specifically Way is：When low gear is in direct-drive state, low gear engaging sleeve SS1 " engagement ", low gear switch valve VC1 " cut-off ", low gear Throttle valve VD1 " fully closed ", low gear transfer gear FD1 stalls, freewheel clutch SC separation, the power inputted by input shaft IZ is through input Gear C i, low gear input gear C11, low gear engaging sleeve SS1, low gear input shaft IZ1, low gear transfer gear FD1, low gear driven shaft DZ1, low gear driving gear C12, low gear driven gear C13 export power after being transmitted to output shaft OZ.When starting shift, height stops Valve VC2 " conducting " is closed, high gear throttle valve VD2 " standard-sized sheet ", hydraulic motor HM are adjusted to maximum pump discharge, engage high gear engaging sleeve SS2, The power inputted by input shaft IZ is through input gear Ci, high gear input gear C21, high gear engaging sleeve SS2, high gear input shaft IZ2 High gear drive end IM2 rotation is driven, because of rotating speed No2=No1 × i2 ÷ i1 of high gear driven end DM2 at this time, high gear drive end IM2 rotates the rotating speed official post high gear transfer gear FD2 suckings formed between high gear driven end DM2 and discharge fluid.It gradually reduces The aperture of high gear throttle valve VD2 makes the oil liquid pressure that high gear transfer gear FD2 is discharged gradually rise, when the oil pressure reaches high block Return high flapper valve VS4 conductings when the Opening pressure of valve VS4.At high gear split point f2, a part of high gear transfer gear FD2 discharges Fluid high gear transfer gear oil inlet a2 is back to high gear transfer gear regurgitant volume Qh2, another part is then supplied with high gear transfer gear Oil stream amount Qd2 is conveyed to hydraulic motor HM through high flapper valve VS4, reduces hydraulic motor HM discharge capacities until making freewheel clutch SC After engagement, the aperture of high gear throttle valve VD2 is further decreased, high gear transfer gear FD2 operating oil pressures can be made to continue to increase and be formed To the split path transmission of output shaft OZ, at this point, the power inputted by input shaft IZ, a part is by low gear transfer gear FD1 with direct The kind of drive passes to output shaft OZ, and another part passes to output shaft OZ by high gear transfer gear FD2 in a manner of split path transmission, As the aperture of high gear throttle valve VD2 further decreases, the accounting by high gear transfer gear FD2 passing powers is bigger, and passes through The accounting of low gear transfer gear FD1 passing powers is then smaller, since low gear transfer gear FD1 is in " engagement " state, transmits power Size be proportional to transfer gear internal oil pressure, when its transmit power be 0 when, internal oil pressure also be 0, institute it is dynamic all by high gear Transfer gear FD2 is transmitted in a manner of split path transmission, at this point, making low gear switch valve VC1 " conducting ", separation low gear engaging sleeve SS1 is interrupted For input shaft IZ to the drive path of low gear transfer gear FD1, system is the conversion completed from low gear to high gear.
Split path transmission state is operated in after variable speed drive change up, vehicle to be made continues to accelerate, in aforementioned 3 Method two and method three control process, this will not be repeated here.
As when being worked with low gear with variable speed drive, when hydraulic motor HM discharge capacities are adjusted to 0, high gear transfer gear For FD1 due to stall " engagement ", variable speed drive is transferred to direct-drive state, can only be made in a manner of increasing power input at this time Vehicle accelerates.
5. top grade change low gear
High gear is converted to low gear and is carried out when high gear is operated in split path transmission state.When changing to low gear, low gear is engaged first Then engaging sleeve SS1 increases the aperture of hydraulic motor HM discharge capacities and high gear throttle valve VD2 simultaneously, output shaft OZ rotating speeds is made to decline, Until when the rotating speed of low gear driven end DM1 is No1=No2 × i1 ÷ i2, make low gear switch valve VC1 " cut-off ", low gear transfer gear Oil pressure is begun setting up inside FD1, the power that a part is inputted by input shaft IZ begins through low gear transfer gear FD1 with direct-drive Mode passes to output shaft OZ, and as the aperture of high gear throttle valve VD2 continues to increase, low gear transfer gear FD1 internal oil pressures are continuous It increases, is also continuously increased by the accounting of low gear transfer gear FD1 passing powers, and pass through high gear transfer gear FD2 passing powers Accounting then constantly reduces, when the aperture of high gear throttle valve VD2 reaches " standard-sized sheet ", the accounting of high gear transfer gear FD2 passing powers It is reduced to 0, whole power are all transmitted by low gear transfer gear FD1, at this point, separation high gear engaging sleeve SS2, interrupting input axis IZ is to height The drive path of transfer gear FD2 is kept off, system is the conversion completed from high gear to low gear.
Above example only gives a kind of exemplary embodiment of the present invention, and actually the present invention still deposits on this basis In others variation and extend, is now directed to the variation being likely to occur and extension of the invention and is described as follows：
1. in above example, the composite hydraulic-machinery split path transmission device has two gears of high to low gear, but can not Judge that the present invention only has two gears with this.A pair of of gear pair can such as be increased between low gear driven shaft DZ1 and output shaft OZ, With low gear driving and driven gear pair C12, C13 shift is realized by installing the structures such as synchronizer additional.Therefore in the claims in the present invention 1 It is middle by the connection relation of low gear driving gear C12 and low gear driven gear C13 and high gear driving gear C22 and high gear driven tooth The meaning that the connection relation of wheel C23 is defined as " being sequentially connected " is that this.It can be seen that in the base of general principles On plinth, may be implemented more than two gear gear output be skilled artisans appreciate that.
2. in above example, the undeclared situation of reversing gear of the composite hydraulic-machinery split path transmission device can be according to vehicle Traveling need install additional reverse gear.The structure type reversed gear can have diversified forms, such as can be in the motor drive shaft MZ of hydraulic motor HM It installs corresponding reverse gear pair additional, can also install respective teeth wheel set additional on low gear driven shaft DZ1, high gear driven shaft DZ2, it can also By the way that low gear driving gear C12 to be connect with high gear driven gear C23 by gear, realization is reversed gear.Certainly, reversing gear can be arranged In the present invention program, it can also be arranged outside transmission system of the present invention, so it is inessential to reverse gear for the present invention Mechanism further limits so being made not to this in the claims in the present invention 1.This be skilled addressee readily understands that 's.
3. in above example, the transmission of the composite hydraulic-machinery split path transmission device is controlled by hydraulic control system It unites to realize, hydraulic control system is various informative, can be simple, can also be complicated, so only described in examples detailed above explanation The basic principle and implementation process of this programme, as long as hydraulic control system meets the control requirement of the present invention, so that it may to realize Control to this programme variable speed drive.
4. in above example, the low gear transfer gear FD1 and high gear transfer gear FD2 are vane type constant displacement pumps or interior Intermeshing gear pump or cycloid rotor pump or axial plunger constant displacement pump.
5. in above example, the hydraulic motor HM is single-acting blade-type variable displacement motor or axial plunger Formula variable displacement motor.
6. in above example, the freewheel clutch SC is roller-type overrunning clutch or ball-type overdrive clutch Device or ratchet wheel pawl type freewheel clutch or Wedge type over running clutch.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.

Claims (4)

1. a kind of combined type double fluid variable speed drive, it is characterised in that：Mainly by input transmission module, low gear transfer gear （FD1）, low gear hydraulic drive module, low gear machine driving module, high gear transfer gear（FD2）, high gear hydraulic drive module, high gear Machine driving module, hydraulic motor（HM）, motor output transmission module and output shaft（OZ）Composition；
The input transmission module is by input shaft（IZ）, input gear（Ci）, low gear input gear（C11）, low gear input shaft （IZ1）, low gear engaging sleeve（SS1）, high gear input gear（C21）, high gear input shaft（IZ2）With high gear engaging sleeve（SS2）Composition；
The input shaft（IZ）Pivoting support is in the shell of the transmission device（KT）On, the input gear（Ci）It is fixedly arranged on defeated Enter axis（IZ）On, and at the same time with low gear input gear（C11）With high gear input gear（C21）It is meshed；
The low gear input gear（C11）Tool is there are one central shaft and with central shaft pivoting support in shell（KT）On；It is described Low gear input shaft（IZ1）With low gear input gear（C11）It is coaxially arranged, the low gear engaging sleeve（SS1）It is sheathed on low gear input Axis（IZ1）One end and can be along low gear input shaft（IZ1）It slides axially, when low gear engaging sleeve（SS1）Slide to low gear input gear （C11）Side and with low gear input gear（C11）In conjunction with when, low gear input gear（C11）With low gear input shaft（IZ1）It is formed and is passed Dynamic connection, when low gear engaging sleeve（SS1）When sliding to the other side, low gear input gear（C11）With low gear input shaft（IZ1）The company of disengagement It connects；
The high gear input gear（C21）Tool is there are one central shaft and with central shaft pivoting support in shell（KT）On；It is described High gear input shaft（IZ2）With high gear input gear（C21）It is coaxially arranged, the high gear engaging sleeve（SS2）It is sheathed on high gear input Axis（IZ2）One end and can be along high gear input shaft（IZ2）It slides axially, when high gear engaging sleeve（SS2）Slide to high gear input gear （C21）Side and with high gear input gear（C21）In conjunction with when, high gear input gear（C21）With high gear input shaft（IZ2）It is formed and is passed Dynamic connection, when high gear engaging sleeve（SS2）When sliding to the other side, high gear input gear（C21）With high gear input shaft（IZ2）The company of disengagement It connects；
The low gear transfer gear（FD1）Mainly by low gear positive displacement pump, low gear into oil seal（Sa1）It is sealed with low gear oil extraction （Sb1）Composition, the rotor of low gear positive displacement pump is as low gear transfer gear（FD1）Low gear drive end（IM1）With low gear input shaft （IZ1）It is sequentially connected, the stator of low gear positive displacement pump is as low gear transfer gear（FD1）Low gear driven end（DM1）Relative to Shell（KT）Pivoting support；The low gear is into oil seal（Sa1）For a rotatory sealing channel for low gear positive displacement pump oil inlet, There are one low gear oil inlet fixed ports and a low gear oil inlet to rotate port for rotatory sealing channel tool, and low gear oil inlet rotates port The low pressure chamber of low gear positive displacement pump is connect and is connected to the oil inlet of low gear positive displacement pump, and low gear oil inlet fixed port is as low Keep off transfer gear oil inlet（a1）；The low gear oil extraction sealing（Sb1）It is logical for the rotatory sealing for low gear positive displacement pump oil extraction Road, there are one low gear oil extraction fixed ports and a low gear oil extraction to rotate port, low gear oil extraction rotation for rotatory sealing channel tool Port connect with the oil discharge outlet of low gear positive displacement pump and is connected to the high pressure chest of low gear positive displacement pump, and low gear oil extraction fixed port is made For low gear transfer gear oil discharge outlet（b1）；
The low gear hydraulic drive module includes low gear check valve（VS1）, low gear switch valve（VC1）, low gear throttle valve（VD1）With Low gear check-valves（VS3）；
The low gear check valve（VS1）Unilaterally connected fuel tank（T）To low gear transfer gear oil inlet（a1）The oil circuit in direction, low gear list To valve（VS1）With low gear transfer gear oil inlet（a1）Between be equipped with low gear import confluence（j1）；
The low gear switch valve（VC1）It is a bi-bit bi-pass switch valve, and there are one low gear switch valve imports for tool（ac1）With One low gear switchs valve outlet（bc1）, low gear transfer gear oil discharge outlet（b1）Extend outwardly and be equipped with oil extraction oil circuit, on the oil extraction oil circuit It is first equipped with low gear split point successively（f1）It is equipped with confluence with rear（p）, low gear switch valve（VC1）It is connected on low gear transfer gear oil extraction Mouthful（b1）With low gear split point（f1）Between oil extraction oil circuit on, low gear switch valve import（ac1）It is connected to low gear transfer gear oil extraction Mouthful（b1）, low gear switch valve outlet（bc1）It is connected to low gear split point（f1）, when low gear switch valve（VC1）When in left position, low gear Transfer gear oil discharge outlet（b1）To low gear split point（f1）Oil circuit cut-off, low gear switch valve（VC1）When in right position, low gear transfer Device oil discharge outlet（b1）To low gear split point（f1）Oil circuit conducting, low gear switch valve（VC1）Initial position be " conducting "；
The low gear throttle valve（VD1）It is an adjustable throttling, aperture regulation range is " fully closed " to " standard-sized sheet ", low gear Throttle valve（VD1）There are one low gear throttle valve imports for tool（ad1）With a low gear throttling valve outlet（bd1）, low gear throttle valve into Mouthful（ad1）It is connected to low gear split point（f1）, low gear throttling valve outlet（bd1）It is connected to low gear import confluence（j1）, when low gear section Flow valve（VD1）When " fully closed ", low gear split point（f1）To low gear import confluence（j1）Oil circuit cut-off, when low gear throttle valve （VD1）When " standard-sized sheet ", low gear split point（f1）To low gear import confluence（j1）Oil circuit it is fully on, when low gear throttle valve （VD1）When part is opened, low gear split point（f1）To low gear import confluence（j1）Oil circuit it is partially ON, and its be connected journey Degree is with low gear throttle valve（VD1）Aperture increase and increase；
The low gear check-valves（VS3）It is a check valve, and there are one low gear check valve inlets for tool（as3）With a low gear Non-return valve outlet（bs3）, low gear check-valves（VS3）Unilaterally connected low gear split point（f1）To confluence（p）The oil circuit in direction is low Flapper valve import（as3）It is connected to low gear split point（f1）, low gear non-return valve outlet（bs3）It is connected to confluence（p）；
The low gear machine driving module includes low gear driven shaft（DZ1）, low gear driving gear（C12）With low gear driven gear （C13）；The low gear driven shaft（DZ1）Pivoting support is in shell（KT）On, low gear driven shaft（DZ1）One end and low gear transfer gear （FD1）Low gear driven end（DM1）It is sequentially connected, the other end and low gear driving gear（C12）It is sequentially connected, low gear driving gear （C12）With low gear driven gear（C13）It is sequentially connected, low gear driven gear（C13）With the output shaft（OZ）It is sequentially connected；
The high gear transfer gear（FD2）Mainly by high gear positive displacement pump, high gear into oil seal（Sa2）It is sealed with high gear oil extraction （Sb2）Composition, the rotor of high gear positive displacement pump is as high gear transfer gear（FD2）High gear drive end（IM2）With high gear input shaft （IZ2）It is sequentially connected, the stator of high gear positive displacement pump is as high gear transfer gear（FD2）High gear driven end（DM2）Relative to Shell（KT）Pivoting support；The high gear is into oil seal（Sa2）For a rotatory sealing channel for high gear positive displacement pump oil inlet, There are one high gear oil inlet fixed ports and a high gear oil inlet to rotate port for rotatory sealing channel tool, and high gear oil inlet rotates port The low pressure chamber of high gear positive displacement pump is connect and is connected to the oil inlet of high gear positive displacement pump, and high gear oil inlet fixed port is as high Keep off transfer gear oil inlet（a2）；The high gear oil extraction sealing（Sb2）It is logical for the rotatory sealing for high gear positive displacement pump oil extraction Road, there are one high gear oil extraction fixed ports and a high gear oil extraction to rotate port, high gear oil extraction rotation for rotatory sealing channel tool Port connect with the oil discharge outlet of high gear positive displacement pump and is connected to the high pressure chest of high gear positive displacement pump, and high gear oil extraction fixed port is made For high gear transfer gear oil discharge outlet（b2）；
The high gear hydraulic drive module includes high gear check valve（VS2）, high gear switch valve（VC2）, high gear throttle valve（VD2）With High flapper valve（VS4）；
The high gear check valve（VS2）Unilaterally connected fuel tank（T）To high gear transfer gear oil inlet（a2）The oil circuit in direction, high gear list To valve（VS2）With high gear transfer gear oil inlet（a2）Between be equipped with high gear import confluence（j2）；
The high gear switch valve（VC2）It is a bi-bit bi-pass switch valve, and there are one high gear switch valve imports for tool（ac2）With One high gear switchs valve outlet（bc2）, high gear transfer gear oil discharge outlet（b2）Extend outwardly and be equipped with oil extraction oil circuit, on the oil extraction oil circuit Equipped with high gear split point（f2）, high gear switch valve（VC2）It is connected on high gear transfer gear oil discharge outlet（b2）With high gear split point（f2） Between oil extraction oil circuit on, high gear switch valve import（ac2）It is connected to high gear transfer gear oil discharge outlet（b2）, high gear switch valve outlet （bc2）It is connected to high gear split point（f2）, when high gear switch valve（VC2）When in left position, high gear transfer gear oil discharge outlet（b2）To height Keep off split point（f2）Oil circuit cut-off, high gear switch valve（VC2）When in right position, high gear transfer gear oil discharge outlet（b2）To high gear point Flow point（f2）Oil circuit conducting, high gear switch valve（VC2）Initial position be " conducting "；
The high gear throttle valve（VD2）It is an adjustable throttling, aperture regulation range is " fully closed " to " standard-sized sheet ", high gear Throttle valve（VD2）There are one high gear throttle valve imports for tool（ad2）With a high gear throttling valve outlet（bd2）, high gear throttle valve into Mouthful（ad2）It is connected to high gear split point（f2）, high gear throttling valve outlet（bd2）It is connected to high gear import confluence（j2）, when high gear section Flow valve（VD2）When " fully closed ", high gear split point（f2）To high gear import confluence（j2）Oil circuit cut-off, when high gear throttle valve （VD2）When " standard-sized sheet ", high gear split point（f2）To high gear import confluence（j2）Oil circuit it is fully on, when high gear throttle valve （VD2）When part is opened, high gear split point（f2）To high gear import confluence（j2）Oil circuit it is partially ON, and its be connected journey Degree is with high gear throttle valve（VD2）Aperture increase and increase；
The high flapper valve（VS4）It is a check valve, and there are one high gear check valve inlets for tool（as4）With a high gear Non-return valve outlet（bs4）, high flapper valve（VS4）Unilaterally connected high gear split point（f2）To confluence（p）The oil circuit in direction is high Flapper valve import（as4）It is connected to high gear split point（f2）, high flapper valve outlet（bs4）It is connected to confluence（p）；
The high gear machine driving module includes high gear driven shaft（DZ2）, high gear driving gear（C22）With high gear driven gear （C23）；The high gear driven shaft（DZ2）Pivoting support is in shell（KT）On, high gear driven shaft（DZ2）One end and high gear transfer gear （FD2）High gear driven end（DM2）It is sequentially connected, the other end and high gear driving gear（C22）It is sequentially connected, high gear driving gear （C22）With high gear driven gear（C23）It is sequentially connected, high gear driven gear（C23）With the output shaft（OZ）It is sequentially connected；
The hydraulic motor（HM）It is that a positive displacement becomes displacement hydraulic motor, stator is fixedly arranged on shell（KT）On, hydraulic pressure horse It reaches（HM）With oil inlet and oil discharge outlet, the confluence（p）It is connected to hydraulic motor（HM）Oil inlet, hydraulic motor（HM）'s Oil discharge outlet is connected to fuel tank（T）；
The motor output transmission module includes freewheel clutch（SC）, motor drive shaft（MZ）, motor driving gear（Cm1）And motor Driven gear（Cm2）；
The freewheel clutch（SC）Characteristic with unidirectional delivery power is equipped with drive end and driven end, freewheel clutch （SC）Drive end and motor drive shaft（MZ）It is sequentially connected, motor drive shaft（MZ）Pivoting support is in shell（KT）On, motor drive shaft（MZ）With Hydraulic motor（HM）Rotor be sequentially connected, freewheel clutch（SC）Driven end be fixedly arranged on motor driving gear（Cm1）On, when Hydraulic motor（HM）Pass through motor drive shaft（MZ）It exports rotating speed and the output rotating speed has more than motor driving gear（Cm1）Rotating speed When trend, freewheel clutch（SC）In conjunction with hydraulic motor（HM）Power pass to motor driving gear（Cm1）, work as motor drive shaft （MZ）Rotating speed be less than motor driving gear（Cm1）When rotating speed, freewheel clutch（SC）It detaches and interrupts motor drive shaft（MZ）To horse Up to driving gear（Cm1）Passing power；The motor driving gear（Cm1）With motor driven gear（Cm2）Be meshed, motor from Moving gear（Cm2）With the output shaft（OZ）It is sequentially connected, the output shaft（OZ）Pivoting support is in shell（KT）On.
2. combined type double fluid variable speed drive according to claim 1, it is characterised in that：The low gear transfer gear （FD1）With high gear transfer gear（FD2）It is vane type constant displacement pump or crescent gear pump or cycloid rotor pump, or axial Plunger piston fixed displacement pump.
3. combined type double fluid variable speed drive according to claim 1, it is characterised in that：The hydraulic motor（HM）It is Single-acting blade-type variable displacement motor or axial piston variable displacement motor.
4. combined type double fluid variable speed drive according to claim 1, it is characterised in that：The freewheel clutch（SC） It is that roller-type overrunning clutch or ball-type freewheel clutch or ratchet wheel pawl type freewheel clutch or Wedge-type are super More clutch.
CN201810426650.0A 2018-05-07 2018-05-07 Combined double-flow variable-speed transmission device Active CN108468781B (en)

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CN109780085A (en) * 2019-03-08 2019-05-21 安徽枞合传动科技有限公司 Coaxial same end combined type double clutch transmissions

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