CN102602852B - Hydraulic hybrid stacking machine - Google Patents
Hydraulic hybrid stacking machine Download PDFInfo
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- CN102602852B CN102602852B CN201210080013.5A CN201210080013A CN102602852B CN 102602852 B CN102602852 B CN 102602852B CN 201210080013 A CN201210080013 A CN 201210080013A CN 102602852 B CN102602852 B CN 102602852B
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Abstract
The invention provides a hydraulic hybrid power forklift, which comprises a lifting oil cylinder, a drive axle, a first hydraulic motor, a second hydraulic motor, a first hydraulic pump, an engine, a coupler and an energy accumulator, wherein the power output of the engine is transmitted to the coupler, and the power output of the coupler drives the drive axle; potential energy generated by the heavy object in the working process drives the lifting oil cylinder to generate hydraulic energy, the hydraulic energy drives the second hydraulic motor, the second hydraulic motor drives the first hydraulic pump to rotate, the hydraulic energy generated by the second hydraulic pump is stored in the energy accumulator, the energy accumulator drives the first hydraulic motor, and the first hydraulic motor outputs power to drive the coupler. By the technical scheme, potential energy is recycled when the portal frame descends, the recycled potential energy is used for starting the machine, lifting the portal frame in a short distance and the like, energy consumption of the system can be effectively saved, the problem of hydraulic fittings is solved, and cost is reduced.
Description
Technical field
The present invention relates to a kind of Forklift, in particular to a kind of energy-saving stacking machine, relate in particular to parallel hydraulic hybrid Forklift.
Background technology
Empty van container stacking machine is the implement of the carrying of a kind of freight container periodicity and stacking, needs in the course of the work Fraquent start braking and lifting container oscilaltion.In suspender decline process, most of potential energy consumes in vain, does not recycle, and energy dissipation is serious, and in operation process, car load starts frequently, causes engine efficiency low, and the oil consumption of travelling is higher.
Traditional parallel-connection type hybrid power vehicle (as bus, heavily card, loader etc.) is all to reclaim braking energy to carry out energy-conservationly, and while braking, the motor of parallel connection uses as pump, is high-voltage energy storage device topping up, and the high pressure oil of recovery is used further to the auxiliary machine that opens.
Existing correlation technique mainly contains following shortcoming:
1. braking energy reclaims and must adopt pump-motor dual purpose special variable motor, because hydraulic hybrid technology is also immature, does not have the accessory of standard optional, and the hydraulic fittings of hybrid power is restricted.
2. when the stopping distance to vehicle while braking and speed have requirement, it is very complicated that control system will become, and the function unit of increase is also many.
3. energy-saving effect and braking frequency are directly proportional, and common driving vehicle often energy-saving effect is not good.
When Forklift door frame declines, hydraulic efficiency pressure system discharge capacity is large but pressure is lower, must after supercharging, just can be filled with in accumulator, requires door frame descending speed adjustable, when topping up, can't affect operating characteristic.
The hydraulic pressure recovery scheme that can use for reference at present has:
1, pressurized cylinder mode, large discharge capacity low pressure oil when door frame declines changes high-pressure small-displacement oil into by pressurized cylinder, is filled with in energy storage.Shortcoming is pressurized cylinder speed governing difficulty, discontinuous when two pressurized cylinder commutations, exists and impacts.
2, when moving trolley two is braked, because inertia is very large, pressure is very high, is easily high pressure accumulator topping up.But when Forklift door frame declines, low oil pressure, traditional method is not suitable for Forklift operating mode.
Therefore,, for existing correlation technique, need the problem of solution as follows:
1. reclaim door frame gravitional force and fall, be filled with high-voltage energy storage device after low pressure oil is changed into high pressure oil;
2. accumulator supercharging pressure is gradual change, how to stablize its pressure;
3. under door frame, reduction of speed, according to different operating mode speed differences, requires controlled;
4. to realize accessory without double-purpose motor general for running motor;
5. the utilization of hydraulic energy after reclaiming.
Summary of the invention
For one of solving the problems of the technologies described above at least, the invention provides a kind of hydraulic hybrid Forklift.
Hydraulic hybrid Forklift provided by the invention, comprise: elevating ram, drive axle, the first HM Hydraulic Motor, the second HM Hydraulic Motor, the first Hydraulic Pump, driving engine, coupler and energy storage, wherein, described engine power exports described coupler to, and described coupler power output drives described drive axle; The potential energy that weight produces at work drives described elevating ram to produce hydraulic energy, described hydraulic energy drives described the second HM Hydraulic Motor, the first Hydraulic Pump rotation described in described the second fluid motor-driven, the hydraulic energy that described the first Hydraulic Pump produces is stored in described energy storage, described energy storage drives described the first HM Hydraulic Motor, and described the first HM Hydraulic Motor outputting power drives described coupler.
In this technical scheme, potential energy can decline to Forklift door frame time carries out recycling, potential energy while decline by door frame is by driving elevating ram to be converted to hydraulic energy, and the hydraulic energy transfer of low-pressure hydraulic oil form elevating ram being produced by the second HM Hydraulic Motor and the first Hydraulic Pump is the hydraulic energy of high-pressure and hydraulic oil form, and be stored in energy storage, then drive the first motor with the hydraulic energy in energy storage, and then the drive axle of driving Forklift, thereby the potential energy that door frame is declined is reclaimed and is utilized, avoid potential energy in door frame decline process consume in vain and cause energy dissipation, can reduce the energy consumption of Forklift, cost-saving.
Preferably, also comprise change speed gear box, described engine output power is passed to described coupler by described change speed gear box.
Or, also comprising change speed gear box, described coupler outputting power is passed to described drive axle by described change speed gear box.
Driving engine, change speed gear box and coupler, adopt above-mentioned two kinds of connection modes, both can meet the present invention and reclaim and utilize the needs of door frame potential energy, can realize again different working condition requirements.
In technique scheme, preferably, also comprise the second Hydraulic Pump, wherein, described change speed gear box drives the second Hydraulic Pump rotation, and the hydraulic energy that described the second Hydraulic Pump produces drives elevating ram lifting weight.
In this technical scheme, can utilize driving engine and/or the first HM Hydraulic Motor outputting power through change speed gear box, drive the second Hydraulic Pump, thereby drive elevating ram work, therefore, can further improve the ability of elevating ram lifting weight, meet different working condition requirements.
Preferably, described energy storage can also directly drive described elevating ram lifting weight.Adopt this technical scheme, in of short duration lifting action, not start the engine, only adopts the energy storing in energy storage to drive elevating ram, realizes energy-conservationly, can reduce driving engine and play machine number of times simultaneously, extends the life-span of driving engine.
Preferably, also comprise control cock, described energy storage is driven described the first HM Hydraulic Motor and/or is driven described elevating ram lifting weight by described control cock.In this technical scheme, adopt control cock to control as required the use of collecting after door frame potential energy, make full use of the door frame potential energy of collecting.
Preferably, described the second HM Hydraulic Motor is large discharge capacity variable-dis-placement motor, and described the first Hydraulic Pump is small displacement controllable capacity pump.In this technical scheme, adopt the interlock of variable-dis-placement motor and controllable capacity pump, the recoverable while of gesture when door frame is declined, the fluid of low pressure and mass flow when door frame can be declined is converted to the fluid of high-pressure low-flow, is stored in energy storage thereby door frame potential energy is converted into high pressure liquid pressure energy; In addition, adopt variable-dis-placement motor, can control the descending speed of door frame, prevent unexpected generation and Prevention of Hydraulic System Overheating, adopt controllable capacity pump can adjust along with the rising of energy storage pressure mouth pressure, what solve the gradual change of energy storage supercharging pressure is topic, is convenient to the storage of energy.
Preferably, also comprise change-over valve, described change-over valve is selectively connected described elevating ram with described the second Hydraulic Pump, described energy storage or described the second HM Hydraulic Motor.In this technical scheme, adopt change-over valve to realize the work of elevating ram, the storage of hydraulic energy, it is convenient to control, and can and need to control according to operating mode, and cost is low, is easy to realize.
Preferably, described change-over valve is two four-way electromagnetic reversing valves.In this technical scheme, adopt two four-way electromagnetic reversing valves to control flexibly, can by control in two position four-way solenoid valves electromagnet whether electric two position four-way solenoid valves that make in diverse location.When electromagnet must not when electricity, in making, elevating ram is connected with the second Hydraulic Pump two position four-way solenoid valves, and the direct coupled position of energy storage oil circuit; When electromagnet obtains when electric, the position of two position four-way solenoid valves in elevating ram is connected with the second HM Hydraulic Motor oil circuit.Therefore, use two position four-way solenoid valves can realize Long-distance Control and automatically control, improve the alerting ability of control accuracy and control.
Preferably, between the entrance of described the second HM Hydraulic Motor and fuel tank, be also provided with by pass valve, be also provided with filter in the exit of described the second HM Hydraulic Motor and the entrance of described the first Hydraulic Pump, described the first HM Hydraulic Motor is variable-dis-placement motor.Between the entrance of described variable-dis-placement motor and fuel tank, be also provided with by pass valve, can effectively avoid in variable-dis-placement motor pressure excessive and produce potential safety hazard, ensured the safety of variable-dis-placement motor, improved the reliability of system, also be provided with filter in the exit of described variable-dis-placement motor and the entrance of described controllable capacity pump, can filtering system in foreign matter in fluid, make the fluid of door frame potential energy recovery system more clean, extended the service life of system, reduced the fault of system, described motor also adopts variable-dis-placement motor, can, according to the rotating speed of motor described in the pressure of liquid dielectric in energy storage and flow regulating, meet the operating needs of different operating modes, in addition, in Forklift working process, potential energy waste is main energy dissipation part, the waste of braking energy is relatively little, the effect that reclaims braking energy in the situation that reclaiming potential energy is just very not obvious, so the application does not reclaim braking energy, owing to not needing that braking energy is reclaimed, so adopt common variables motor, and do not need to use pump-motor double-acting type motor, reduce cost, and owing to having adopted common variables motor, accessory can be exchanged with other motor, realize accessory general, further reduce cost, solve the problem of hydraulic fittings.
In sum, by technical scheme of the present invention, realized recovery and the utilization of potential energy when door frame is declined, the potential energy that is about to reclaim is used for opening machine, door frame short range lifting, auxiliary engine walking etc., can effectively save the energy consumption of system, reduces costs.
Brief description of the drawings
Fig. 1 is the schematic diagram of hydraulic hybrid Forklift according to an embodiment of the invention;
Fig. 2 is the schematic diagram of hydraulic hybrid Forklift in accordance with another embodiment of the present invention.
Detailed description of the invention
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.
Set forth in the following description a lot of details so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 1 is the schematic diagram of hydraulic hybrid Forklift according to an embodiment of the invention.
As shown in Figure 1, the invention provides a kind of hydraulic hybrid Forklift, comprise: elevating ram 6, drive axle 12, the first HM Hydraulic Motor 4, the second HM Hydraulic Motor 7, the first Hydraulic Pump 8, driving engine 1, coupler 3 and energy storage, wherein, described driving engine 1 power exports described coupler 3 to, and described coupler 3 power outputs drive described the second load drive axle;
The potential energy that weight produces at work drives described elevating ram 6 to produce hydraulic energy, described elevating ram 6 drives described the second HM Hydraulic Motor 7, described the second HM Hydraulic Motor 7 drives described the first Hydraulic Pump 8 to rotate, the hydraulic energy that described the first Hydraulic Pump 8 produces is stored in described energy storage 9, described energy storage 9 drives described the first HM Hydraulic Motor 4, and described the first HM Hydraulic Motor 4 outputting powers drive described coupler 3.
In this technical scheme, potential energy can decline to Forklift door frame time carries out recycling, the potential energy when door frame that is about to be connected with the first load-elevating ram 6 declines, be converted into hydraulic energy by elevating ram 6, and be converted into hydraulic energy by the second HM Hydraulic Motor 7 and the first Hydraulic Pump 8, store and be in energy storage 9.Then can drive the first HM Hydraulic Motor 4 with the hydraulic energy in energy storage 9, and then driving the second load-drive axle 12, thereby the potential energy that door frame is declined is reclaimed and is utilized, avoid potential energy in door frame decline process consume in vain and cause energy dissipation, can reduce the energy consumption of Forklift, cost-saving.
Preferably, also comprise change speed gear box 2, described coupler 3 outputting powers are passed to described drive axle 12 by described change speed gear box 2.
In this technical scheme, driving engine 1, change speed gear box 2 and coupler 3, adopt this connection mode, both can meet the present invention and reclaim and utilize the needs of door frame potential energy, can realize again different working condition requirements.
Preferably, also comprise the second Hydraulic Pump 5, wherein, described change speed gear box 3 drives the second Hydraulic Pump 5 to rotate, and the hydraulic energy that described the second Hydraulic Pump 5 produces drives elevating ram 6 lifting weights.
In this technical scheme, can utilize driving engine 1 and/or the first HM Hydraulic Motor 4 to drive the second Hydraulic Pump 5 to rotate, drive elevating ram 6 to work thereby produce hydraulic energy, therefore, the ability that can further improve elevating ram lifting weight, meets different working condition requirements.
Preferably, described energy storage 9 can also directly drive elevating ram 6 lifting weights.Adopt this technical scheme, in of short duration lifting action, not start the engine 1, only adopts the energy storing in energy storage to drive elevating ram, realizes energy-conservationly, can reduce driving engine and play machine number of times simultaneously, extends the life-span of driving engine.
Preferably, also comprise control cock 10, described energy storage 9 is driven described the first HM Hydraulic Motor 4 and/or is driven elevating ram 6 lifting weights by described control cock 10.In this technical scheme, adopt control cock 10 to control as required the use of collecting after door frame potential energy, make full use of the door frame potential energy of collecting.
Preferably, described the second HM Hydraulic Motor 7 is large discharge capacity variable-dis-placement motor, and described the first Hydraulic Pump 8 is small displacement controllable capacity pump.In this technical scheme, adopt the interlock of variable-dis-placement motor 7 and controllable capacity pump 8, the recoverable while of gesture when door frame is declined, the fluid of low pressure and mass flow when door frame can be declined is converted to the fluid of high-pressure low-flow, is stored in energy storage 9 thereby door frame potential energy is converted into high pressure liquid pressure energy; In addition, adopt variable-dis-placement motor 7, can control the descending speed of door frame, prevent unexpected generation and Prevention of Hydraulic System Overheating, adopt controllable capacity pump 8 to adjust mouth pressure along with the rising of energy storage 9 pressure, what solve energy storage 9 supercharging pressure gradual changes is topic, is convenient to the storage of energy.
Preferably, door frame potential energy recovery system also comprises change-over valve 11, and described change-over valve 11 is selectively connected elevating ram 6 with described the second Hydraulic Pump 5, described energy storage 9 or described the second HM Hydraulic Motor 7 oil circuits.In this technical scheme, adopt change-over valve 11 to realize the work of elevating ram 6, the storage of hydraulic energy, it is convenient to control, and can and need to control according to operating mode, and cost is low, is easy to realize.
Further, described change-over valve 11 is two four-way electromagnetic reversing valves.In this technical scheme, two four-way electromagnetic reversing valve controls are flexible, and can realize Long-distance Control and automatically control, and improve the precision of control and the alerting ability of control.In the present embodiment, the working process of these two four-way electromagnetic reversing valves 11 is: electromagnet energising, and two four-way electromagnetic reversing valve 11 left position work, now, elevating ram 6 is communicated with the second HM Hydraulic Motor 7, thereby reclaims the potential energy that door frame declines; When electromagnet stops energising, two four-way electromagnetic reversing valve 11 right position work, now, elevating ram 6 is communicated with the second Hydraulic Pump 5, realize the normal work of elevating ram 6, in this case, if realize the short range lifting of elevating ram 6, need not start the engine 1 and then drive the second Hydraulic Pump 5 to drive the work of elevating ram 6, and only by control cock 10, connect elevating ram 6 and energy storage 9, drive the of short duration lifting of elevating ram 6 with the energy storing in energy storage 9, save the energy.
Preferably, between the entrance of variable-dis-placement motor 7 and fuel tank 13, be also provided with by pass valve 14.In this technical scheme, use by pass valve 14, can effectively avoid in variable-dis-placement motor 7 pressure excessive and produce potential safety hazard, ensure the safety of variable-dis-placement motor 7, improve the reliability of system.
Preferably, be also provided with filter 15 in the exit of variable-dis-placement motor 7 and the entrance of controllable capacity pump 8.In this technical scheme, can filtering system in foreign matter in fluid, make the fluid of door frame potential energy recovery system more clean, extended the service life of system, reduced the fault of system.
Preferably, preferably described motor 4 also adopts variable-dis-placement motor.So can carry out according to the pressure of liquid dielectric in energy storage and flow the rotating speed of governor motor 4, meet the operating needs of different operating modes, in addition, in Forklift working process, potential energy waste is main energy dissipation part, the waste of braking energy is relatively little, the effect that reclaims braking energy in the situation that reclaiming potential energy is just very not obvious, so the application does not reclaim braking energy, owing to not needing that braking energy is reclaimed, so adopt common variables motor 4, and do not need to use pump-motor double-acting type motor, reduce cost, and owing to having adopted common motor, accessory can be exchanged with other motor, realize accessory general, further reduce cost, solve the problem of hydraulic fittings.
As shown in Figure 1, in the present embodiment, driving engine 1, change speed gear box 2, coupler 3 connect successively, the output shaft of coupler 3 and the drive axle of Forklift 12 mechanical connections, the potential energy that door frame declines adopts hydraulic pressure recovery system to be stored in energy storage with the form of high pressure oil, high pressure oil CD-ROM drive motor 4 when car load starts, motor 4 directly drives drive axle 12 to walk by coupler, and energy storage 9 can also be used for the lifting of door frame low height.
Specifically in each operating mode, the mode of operation of Forklift is as follows:
Door frame decline potential energy reclaims: in variable-dis-placement motor 7, connect with controllable capacity pump 8, when door frame declines, large flow low pressure oil has changed into small flow high pressure oil, and is stored in energy storage 9.Controllable capacity pump 8 is followed energy storage 9 pressure and is changed automatic Displacement Regulation, and output torque is constant, and the speed of the displacement variation of variable-dis-placement motor 7 for regulating elevating ram 6 to decline, has realized the recovery of potential energy when door frame is declined.
Traditional working mode: driving engine 1 directly drives drive axle 12 to walk by transmission shaft after the turbine transformer in change speed gear box 2, retarder, does not reclaim braking energy.In Forklift working process, potential energy waste is main energy dissipation part, and the waste of braking energy is relatively little, and the effect that reclaims braking energy in the situation that reclaiming potential energy is just very not obvious, so braking energy is not reclaimed in the present embodiment; Owing to not needing that braking energy is reclaimed, so running gear adopts common motor, and do not need to use pump-motor double-acting type motor, reduce cost, and owing to having adopted common motor, accessory can have been exchanged with other motor, realize accessory general, further reduced cost.
Hydraulic pressure secondary row walking modes: energy storage 9 high pressure oil starter motors 4, after motor 4 drives car load to move up, hydraulic-driven finishes, and adopts traditional mechanical hydraulic drive walking.Adopt hydraulic pressure to open machine, saved driving engine and directly opened the high oil consumption that machine load changing causes, improved energy utilization efficiency.
Hydraulic moving pattern: in the time of reversing, fine motion or short walk, can depend merely on HM Hydraulic Motor 4 and just can drive, driving engine is without raising speed or treat speed acting, thereby reaches energy-saving effect.
Lifting operating mode: when Forklift is got case on container truck, the door frame very little height that only need hoist, now can adopt the high pressure oil in energy storage 9 to drive elevating ram 6, without starting the driving engine 1 that heap is high, saving energy.
Fig. 2 is the schematic diagram of hydraulic hybrid Forklift in accordance with another embodiment of the present invention.
As shown in Figure 2, in the present embodiment, coupler 3 is arranged between driving engine 1 and change speed gear box 2, the output shaft of change speed gear box 2 and the drive axle of Forklift 12 mechanical connections, other structures be connected same as the previously described embodimentsly, repeat no more.The present embodiment, the potential energy also can reclaim and utilize door frame to decline time, realizes goal of the invention of the present invention.
When hydraulic hybrid Forklift is as shown in Figure 2 time, that is: coupler 3 is arranged between driving engine 1 and change speed gear box 2, the output shaft of change speed gear box 2 and the drive axle of Forklift 12 mechanical connections, the concrete situation of the various operating modes of described hydraulic hybrid Forklift is as follows:
Door frame decline potential energy reclaims: in variable-dis-placement motor 7, connect with controllable capacity pump 8, when door frame declines, large flow low pressure oil has changed into small flow high pressure oil, and is stored in energy storage 9.Controllable capacity pump 8 is followed energy storage 9 pressure and is changed automatic Displacement Regulation, and output torque is constant, and the speed of the displacement variation of variable-dis-placement motor 7 for regulating oil cylinder to decline, has realized the recycling of potential energy when door frame is declined.
Traditional working mode: driving engine 1 directly drives drive axle 12 to walk by transmission shaft after the turbine transformer in change speed gear box 2, retarder.In Forklift working process, potential energy waste is main energy dissipation part, and the waste of braking energy is relatively little, and the effect that reclaims braking energy in the situation that reclaiming potential energy is just very not obvious, so braking energy is not reclaimed in the present embodiment; Owing to not needing that braking energy is reclaimed, so running gear adopts common motor, and do not need to use pump-motor double-acting type motor, reduce cost, and owing to having adopted common motor, accessory can have been exchanged with other motor, realize accessory general, further reduced cost.
Hydraulic pressure secondary row walking modes: the high pressure oil starter motor 4 of energy storage 9, motor 4 is under energy storage 9 high pressure oils drive, and propulsive effort is transferred to drive axle 12 by coupler 3 and change speed gear box 2, makes car load walking, then hydraulic-driven finishes, and adopts traditional mechanical hydraulic drive walking.Adopt hydraulic pressure to open machine, saved driving engine 1 and directly opened the high oil consumption that machine load changing causes, improved energy utilization efficiency.
When door frame lifting: driving engine 1 drives the working barrel 5 on change speed gear box 2 to work, energy storage also can drive motor 4 to work simultaneously, and the power of motor 4 passes on driving engine 1, helps driving engine 1 to work, and alleviates the load of driving engine 1, reaches energy-saving effect.
In the time that Forklift walking needs moment of torsion larger: motor 4 and driving engine 1 are exerted oneself simultaneously, realize collaborative work, and actv. utilizes the energy of energy storage 9.
In sum, by technical scheme of the present invention, realized the recycling of potential energy when door frame is declined, the potential energy of recovery is used for opening machine, door frame short range lifting, auxiliary engine walking etc., can effectively save the energy consumption of system, solve the problem of hydraulic fittings simultaneously, reduce costs.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a hydraulic hybrid Forklift, it is characterized in that, comprise: elevating ram (6), drive axle (12), the first HM Hydraulic Motor (4), the second HM Hydraulic Motor (7), the first Hydraulic Pump (8), driving engine (1), coupler (3) and energy storage (9), wherein, described driving engine (1) power exports described coupler (3) to, and the output of described coupler (3) power drives described drive axle (12);
The potential energy that weight produces at work drives described elevating ram (6) to produce hydraulic energy, described hydraulic energy drives described the second HM Hydraulic Motor (7), described the second HM Hydraulic Motor (7) drives described the first Hydraulic Pump (8) rotation, the hydraulic energy that described the first Hydraulic Pump (8) produces is stored in described energy storage (9), described energy storage (9) drives described the first HM Hydraulic Motor (4), and described the first HM Hydraulic Motor (4) outputting power drives described coupler (3);
Described energy storage (9) can also drive described elevating ram (6) lifting weight;
Also comprise control cock (10), described energy storage (9) is driven described the first HM Hydraulic Motor (4) to rotate and/or is driven described elevating ram (6) lifting weight by described control cock (10).
2. hydraulic hybrid Forklift according to claim 1, is characterized in that, also comprises change speed gear box (2), and described driving engine (1) outputting power is passed to described coupler (3) by described change speed gear box (2).
3. hydraulic hybrid Forklift according to claim 1, is characterized in that, also comprises change speed gear box (2), and described coupler (3) outputting power is passed to described drive axle (12) by described change speed gear box (2).
4. according to the hydraulic hybrid Forklift described in claim 2 or 3, it is characterized in that, also comprise the second Hydraulic Pump (5), wherein, described change speed gear box (2) drives described the second Hydraulic Pump (5) rotation, and the hydraulic energy that described the second Hydraulic Pump (5) produces drives described elevating ram (6) lifting weight.
5. hydraulic hybrid Forklift according to claim 4, is characterized in that,
Described the second HM Hydraulic Motor (7) is large discharge capacity variable-dis-placement motor, and described the first Hydraulic Pump (8) is small displacement controllable capacity pump.
6. hydraulic hybrid Forklift according to claim 4, it is characterized in that, also comprise change-over valve (11), described change-over valve (11) is selectively connected described elevating ram (6) with described the second Hydraulic Pump (5), described energy storage (9) or described the second HM Hydraulic Motor (7).
7. hydraulic hybrid Forklift according to claim 6, is characterized in that, described change-over valve (11) is two four-way electromagnetic reversing valves.
8. hydraulic hybrid Forklift according to claim 4, it is characterized in that, between the entrance of described the second HM Hydraulic Motor (7) and fuel tank (13), be also provided with by pass valve (14), also be provided with filter (15) in the exit of described the second HM Hydraulic Motor (7) and the entrance of described the first Hydraulic Pump (8), described the first HM Hydraulic Motor (4) is variable-dis-placement motor.
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| CN104763696A (en) * | 2015-04-16 | 2015-07-08 | 上海市闸北区物流工程技术研究所 | Electronic control hydraulic driving system used for industrial vehicles |
| CN105236317A (en) * | 2015-11-12 | 2016-01-13 | 潍柴动力股份有限公司 | Electric fork-lift truck, potential energy recycling system and method thereof |
| CN105621322A (en) * | 2016-02-24 | 2016-06-01 | 上海市闸北区物流工程技术研究所 | Full-hydraulic electric stacking forklift |
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