CN1147421C - Novel forklift-walking speed-regulating device - Google Patents
Novel forklift-walking speed-regulating deviceInfo
- Publication number
- CN1147421C CN1147421C CNB011251239A CN01125123A CN1147421C CN 1147421 C CN1147421 C CN 1147421C CN B011251239 A CNB011251239 A CN B011251239A CN 01125123 A CN01125123 A CN 01125123A CN 1147421 C CN1147421 C CN 1147421C
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- China
- Prior art keywords
- pump
- valve
- oil
- variable
- hydraulic
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- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a novel walking type speed regulator for forklifts. A static pressure driving system of the existing counter-balanced forklift adopts a closed type hydraulic circuit and is unable to supply oil to the pump shared by a steering system and a work device, while a common opened type hydraulic circuit must be matched with a high-power prime mover, which wastes the output power of the prime mover. The present invention comprises a variable pump and a dual-speed hydraulic motor which is communicated with the variable pump through a reversing valve. The walking type speed regulator for forklifts is characterized in that an oil outlet of the hydraulic pump is connected to an oil inlet of a high/low pressure servo pressure-regulating valve, a working oil port of the high/low pressure servo pressure-regulating valve is connected with an oil intake cavity of a variable oil cylinder used for regulating variable pump displacement, and a priority valve is arranged between the reversing valve and the hydraulic pump. Four external traction characteristics are obtained by combining two output characteristics of the variable pump and the large and small displacement of the dual-speed hydraulic motor, and the maximum output power of each external traction characteristic is limited at a small value, so that the output power waste of the prime motor id effectively reduced; the priority valve can supply oil for the pump shared by the steering system and the work device.
Description
[technical field]
The present invention relates to a kind of fluid transmission executive device, especially a kind of novel forklift-walking speed-regulating device, the output of control pump and the discharge capacity of motor to obtain multiple outer tractive characteristic, realize the common oil pump feed of running gear and steering swivel system, equipment simultaneously.
[background technology]
The static pressure actuating device of existing counterbalanced lift truck comprises the combination of controllable capacity pump and fixed displacement motor or the combination of fix-displacement pump and variable-dis-placement motor usually, be aided with speed-changing mechanism again and carry out speed governing, two kinds of hydraulic circuits of general employing are realized: a kind ofly be Closed Hydraulic speed control loop independently, another kind is the open hydraulic speed control loop.
When adopting independently the Closed Hydraulic speed control loop, drive system can't with steering swivel system, equipment oil pump feed altogether, need a plurality of oil pumps fuel feeding respectively, and must add the fluid infusion pump in addition and replenish fluid, consumption of power is bigger; Adopt fix-displacement pump when turning to the equipment independent oil supply, bigger excess flow loss is arranged usually, and need start continually and brake, the parts of fork truck are hit bigger.
When adopting the open hydraulic speed control loop, because the tractive force of counterbalanced lift truck needs very big setting range with moving velocity usually according to different walking operating modes: resistance to motion is bigger during climbing, drive system must provide enough tractive forces, and the speed of travel then needn't be too fast; When flat road surface was walked, resistance to motion was less, and drive system need not provide very big tractive force, but enough moving velocitys need be provided.This just must design according to tractive force limit and maximum travelling speed the horsepower output of drive system, to satisfy the demand of various operating modes.Therefore, general open hydraulic speed control loop must be equipped with the high-power primary mover with its coupling, yet counterbalanced lift truck often is not with large traction and the simultaneous high load capacity operating mode operation of high moving velocity, but be in more moderate load operation work, certainly will cause the waste of primary mover horsepower output like this; Simultaneously, can increase the volume and weight of complete machine, and primary mover is in low load behavior work for a long time, reduced system effectiveness.
[summary of the invention]
The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome the defective that prior art exists, a kind of novel forklift-walking speed-regulating device of open type is provided, both the horsepower output of primary mover can be limited in smaller value, and satisfy the requirement of counterbalanced lift truck hydrostatic drive system " low speed large traction, the little tractive force of high speed ", can be total to oil pump feed with steering swivel system, equipment again, and then simplified structure, manufacturing cost reduced, reduce excess flow loss, improve system effectiveness.
Technical scheme of the present invention is: a kind of novel forklift-walking speed-regulating device, comprise Hydraulic Pump and the HM Hydraulic Motor that is communicated with it by change-over valve, it is characterized in that described HM Hydraulic Motor is a double speed hydraulic motor, Hydraulic Pump is a controllable capacity pump, the oil outlet of Hydraulic Pump connects the oil inlet of high and low pressure servo pressure regulating valve, and the actuator port of high and low pressure servo pressure regulating valve connects the oil suction chamber of the variable oil cylinder that is used for the regulated variable pump capacity; Be provided with pressure-gradient control valve between change-over valve and the Hydraulic Pump.Control high and low pressure servo pressure regulating valve makes it to work respectively, change the delivery pressure of controllable capacity pump, and make working medium promote the piston of variable oil cylinder, change the variable capacity of pump, thereby make controllable capacity pump have two kinds of output characteristic, the two kinds of output characteristic of controllable capacity pump and the large and small discharge capacity combination of double speed hydraulic motor can be obtained four kinds of outer tractive characteristics, the maximum output power of every kind of outer tractive characteristic all is limited in smaller value, and both can provide large traction to be suitable for climbing, can on flat road surface, run at high speed again, effectively reduce the waste of primary mover horsepower output.Through pressure-gradient control valve can to turn to, equipment oil pump feed altogether, simplify the structure, reduced manufacturing cost, avoid excess flow loss, system effectiveness is improved.Reduce and frequently to open, to brake fix-displacement pump and the impact of fork truck parts.
Described a kind of novel forklift-walking speed-regulating device, it is characterized in that being provided with control cock between Hydraulic Pump and the high and low pressure servo pressure regulating valve, being used to control high and low pressure servo pressure regulating valve works them respectively, the actuator port of control cock is communicated with the oil suction chamber of locating oil cylinder, the piston rod of locating oil cylinder extends the oil suction chamber of variable oil cylinder, the stroke of dominated variable oil cylinder piston, and then the setting range of control variable pump capacity.
Described a kind of novel forklift-walking speed-regulating device, it is characterized in that HM Hydraulic Motor is provided with drg and the two position three-way valve that is used for the governor motor discharge capacity, the operation two position three-way valve makes it to be in respectively left and right position, the discharge capacity of control double speed hydraulic motor makes it the high, low speed running, and drg is used for double-speed motor is braked.
Described a kind of novel forklift-walking speed-regulating device is characterized in that change-over valve is provided with the buffering make-up valve, plays slow supply oil.
Described a kind of novel forklift-walking speed-regulating device is characterized in that being provided with flow regulating valve between pressure-gradient control valve and the change-over valve, is used for the double speed hydraulic motor infinite speed variation.
The present invention organically combines dual output characteristic variable pump and double speed hydraulic motor, make this static pressure walking speed governing system have four kinds of different outer tractive characteristics, the maximum output power of every kind of outer tractive characteristic all is limited in smaller value, can satisfy the requirement of counterbalanced lift truck " low speed large traction, the little tractive force of high speed " with the primary mover of smaller power; And total system efficient is improved; The Hydraulic Circuit Design of its open type can be total to oil pump feed to each actuating unit, reduces system's excess flow loss, thereby simplifies the internal structure of an organization, and reduces manufacturing cost.Reduce and frequently to open, to brake fix-displacement pump and the impact of fork truck parts.
[description of drawings]
Fig. 1 is a hydraulic schematic diagram of the present invention.
Fig. 2 is variable capacity of pump of the present invention-pressure output characteristic scheme drawing.
Fig. 3 is the outer tractive characteristic scheme drawing of the speed of a motor vehicle-tractive force of the present invention.
[specific embodiment]
As shown in Figure 1, two double speed hydraulic motors 12 that are used to drive the fork truck drive wheel are communicated with controllable capacity pump 1 through two position three-way valve 13, change-over valve 9, flow regulating valve 8 and pressure-gradient control valve 7 successively, change-over valve 9 is provided with the buffering make-up valve of being made up of check valve and by pass valve 10, and double speed hydraulic motor 12 is provided with drg 11; Controllable capacity pump 1 oil outlet is communicated with the variable oil cylinder 2 that is used for the regulated variable pump capacity by control cock 4, low pressure servo pressure regulating valve 6 and high pressure servo pressure regulating valve 5, controllable capacity pump can be external feedback type blade controllable capacity pump, the piston rod of variable oil cylinder 2 is connected with the stator of external feedback type blade controllable capacity pump, so that controllable capacity pump is transmitted the discharge capacity conditioning signal; Connect the locating oil cylinder 3 by control cock 4 controls on the variable oil cylinder 2, the piston rod of locating oil cylinder 3 extends the oil suction chamber of variable oil cylinder 2, is provided with spring in another cavity of variable oil cylinder 2, so that the piston reset of variable oil cylinder 2; Pressure-gradient control valve 7 be provided with lead to turn to, the hydraulic fluid port of equipment.Can change the quantity of the outer tractive characteristic of this speed regulation device as required,, cooperate with double speed hydraulic motor to obtain six kinds of outer tractive characteristics such as increasing a pressure regulation servovalve again.
During work, start controllable capacity pump 1, control cock 4 is placed position, a left side, locating oil cylinder 3 and 5 work of high pressure pressure regulation servovalve, low pressure pressure regulation servovalve 6 is inoperative, and the piston of variable oil cylinder 2 is subjected to the restriction of locating oil cylinder 3 piston rods to have less stroke, and variable capacity of pump setting range is less, this moment, controllable capacity pump had the output characteristic of the little discharge capacity of high pressure, as curve among Fig. 2 1.; Control cock 4 is placed right position, and locating oil cylinder 3 and high pressure pressure regulation servovalve 5 are inoperative, 6 work of low pressure pressure regulation servovalve, the piston of variable oil cylinder 2 has bigger stroke, variable capacity of pump setting range is bigger, and this moment, controllable capacity pump had the output characteristic of the big discharge capacity of low pressure, as curve among Fig. 2 2..Operation two position three-way valve 13 makes it to lay respectively at left and right position, and the discharge capacity that can change double speed hydraulic motor 12 makes it the high, low speed running.The two kinds of output characteristic of controllable capacity pump and the big or small discharge capacity of double speed hydraulic motor are made up respectively, can obtain four kinds of outer tractive characteristics; As shown in Figure 3, curve I is the outer tractive characteristic of the big discharge capacity combination of little displacement characteristic of controllable capacity pump high pressure and double speed hydraulic motor; Curve II is the outer tractive characteristic of the big discharge capacity combination of big displacement characteristic of controllable capacity pump low pressure and double speed hydraulic motor; Curve III is the outer tractive characteristic of little displacement characteristic of controllable capacity pump high pressure and the combination of double speed hydraulic motor float amount; Curve IV is the outer tractive characteristic of little displacement characteristic of controllable capacity pump high pressure and the combination of double speed hydraulic motor float amount.Their maximum output power all is limited at smaller value, and no matter fork truck with which kind of outer tractive characteristic travels, and can not cause the bigger waste of primary mover horsepower output.At these four kinds of outer tractive characteristics, can form and they cooresponding four gears, the configuration corresponding actuating mechanisms just is convenient to operation.Control change-over valve 9 makes it to be in respectively left and right position and can change turning to of double speed hydraulic motor 12, fork truck is advanced or retreats; Regulate flow regulating valve 8 and can realize the stepless change of fork truck in travelling; Only need start drg when stopping to travel gets final product; The impact that buffering make-up valve 10 available buffer fork trucks produce when starting or stoping suddenly, and can carry out fluid infusion, guarantee that fork truck operates steadily.
Claims (5)
1, a kind of novel forklift-walking speed-regulating device, comprise Hydraulic Pump (1) and the HM Hydraulic Motor (12) that is communicated with it by change-over valve (9), it is characterized in that described HM Hydraulic Motor (12) is double speed hydraulic motor, Hydraulic Pump (1) is a controllable capacity pump, the oil outlet of Hydraulic Pump (1) connects the oil inlet of high and low pressure servo pressure regulating valve (5,6), and the actuator port of high and low pressure servo pressure regulating valve (5,6) connects the oil suction chamber of the variable oil cylinder (2) that is used for the regulated variable pump capacity; Be provided with pressure-gradient control valve (7) between change-over valve (9) and the Hydraulic Pump (1).
2, a kind of novel forklift-walking speed-regulating device according to claim 1, it is characterized in that being provided with control cock (4) between Hydraulic Pump (1) and the high and low pressure servo pressure regulating valve (5,6), the actuator port of control cock (4) is communicated with the oil suction chamber of locating oil cylinder (3), and the piston rod of locating oil cylinder (3) extends the oil suction chamber of variable oil cylinder (2).
3, a kind of novel forklift-walking speed-regulating device according to claim 1 is characterized in that HM Hydraulic Motor (12) is provided with drg (11) and is used for the two position three-way valve (13) of governor motor discharge capacity.
4, a kind of novel forklift-walking speed-regulating device according to claim 1 is characterized in that change-over valve (9) is provided with buffering make-up valve (10).
5, a kind of novel forklift-walking speed-regulating device according to claim 1 is characterized in that being provided with flow regulating valve (8) between pressure-gradient control valve (7) and the change-over valve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011251239A CN1147421C (en) | 2001-08-13 | 2001-08-13 | Novel forklift-walking speed-regulating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011251239A CN1147421C (en) | 2001-08-13 | 2001-08-13 | Novel forklift-walking speed-regulating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1405031A CN1405031A (en) | 2003-03-26 |
| CN1147421C true CN1147421C (en) | 2004-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011251239A Expired - Fee Related CN1147421C (en) | 2001-08-13 | 2001-08-13 | Novel forklift-walking speed-regulating device |
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| CN (1) | CN1147421C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374735C (en) * | 2006-01-24 | 2008-03-12 | 中海油田服务股份有限公司 | Sleigh mounted electrohydraulic ratio regulating system |
| CN102346450B (en) * | 2011-06-10 | 2013-01-09 | 杭州奥蒂电控有限公司 | Control input and output circuit for alternating current servo control system for electric fork truck |
| CN102900715B (en) * | 2012-10-08 | 2015-06-24 | 北京索普液压机电有限公司 | Hydraulic control system for forklift, and forklift |
| CN103213494B (en) * | 2013-04-26 | 2015-08-05 | 江苏四明工程机械有限公司 | The double speed walking electrohydraulic control system of self-walking machinery |
| CN103899599B (en) * | 2014-04-24 | 2016-04-27 | 徐州重型机械有限公司 | A kind of controlling method of instant flow matches, system and hoist |
| CN111919026B (en) * | 2018-04-02 | 2022-12-06 | 开利公司 | Electric power generation system and hydraulic system |
| CN109139588A (en) * | 2018-11-09 | 2019-01-04 | 徐工集团工程机械有限公司 | Hydraulic power system and the dual-purpose working truck of rail |
| CN109654075A (en) * | 2018-12-07 | 2019-04-19 | 贵州航天特种车有限责任公司 | A kind of walking fluid power system on chassis |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3247355A1 (en) * | 1982-12-22 | 1984-06-28 | Merck Patent Gmbh, 6100 Darmstadt | Apparatus for quantitatively evaluating thin-layer chromatograms |
| US4505355A (en) * | 1982-01-30 | 1985-03-19 | Losenhausen Maschinenbau Ag | Hydrostatic travelling drive system with towing circuit |
| US5647457A (en) * | 1994-09-08 | 1997-07-15 | B.V. Machinefabriek B.O.A. | Fork-lift truck with hydraulic drive |
| JPH11208299A (en) * | 1998-01-23 | 1999-08-03 | Toyota Autom Loom Works Ltd | Hydraulic running unit for industrial vehicle |
| US6226987B1 (en) * | 1997-12-24 | 2001-05-08 | Komatsu Ltd. | Travel drive apparatus for hydraulic drive work vehicles and control therefor |
| CN2505323Y (en) * | 2001-08-14 | 2002-08-14 | 同济大学 | Fork truck running speed-regulating device |
-
2001
- 2001-08-13 CN CNB011251239A patent/CN1147421C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4505355A (en) * | 1982-01-30 | 1985-03-19 | Losenhausen Maschinenbau Ag | Hydrostatic travelling drive system with towing circuit |
| DE3247355A1 (en) * | 1982-12-22 | 1984-06-28 | Merck Patent Gmbh, 6100 Darmstadt | Apparatus for quantitatively evaluating thin-layer chromatograms |
| US5647457A (en) * | 1994-09-08 | 1997-07-15 | B.V. Machinefabriek B.O.A. | Fork-lift truck with hydraulic drive |
| US6226987B1 (en) * | 1997-12-24 | 2001-05-08 | Komatsu Ltd. | Travel drive apparatus for hydraulic drive work vehicles and control therefor |
| JPH11208299A (en) * | 1998-01-23 | 1999-08-03 | Toyota Autom Loom Works Ltd | Hydraulic running unit for industrial vehicle |
| CN2505323Y (en) * | 2001-08-14 | 2002-08-14 | 同济大学 | Fork truck running speed-regulating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1405031A (en) | 2003-03-26 |
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Owner name: ZHEJIANG JIALI TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: JIALI SCIENCE + TECHNOLOGY DEVELOPMENT CO., LTD., ZHEJIANG PROV. Effective date: 20050520 |
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Effective date of registration: 20050520 Address after: 200092 Siping Road 1239, Shanghai Co-patentee after: Zhejiang Jiali Technology Co., Ltd. Patentee after: Tongji University Address before: 200092 Siping Road 1239, Shanghai Co-patentee before: Zhejiang Jilali Science & Technology Development Co., Ltd. Patentee before: Tongji University |
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