The full hydraulic driving forklift that double static pressure motor drives
Technical field
The present invention relates to the fork truck technical field, specifically a kind of all-hydraulic transmission counterbalanced lift truck that adopts double static pressure motor to drive.
Background technology
At present, the counterbalanced lift truck product of mass selling on the market, drive part are explosive motor and through power-transfer clutch or turbine transformer transmission of power are arrived change speed gear box, pass to semiaxis through main reduction gear, diff again, the drive wheels rotation.This mechanical type driving system exists complex structure, and speed ratio is fixed, and costs an arm and a leg, and fault is multiple, and operating noise is high, the shortcoming that labour intensity is big.Can keep in repair after must dismantling driving engine, change speed gear box, drive axle after driving system breaks down.
Summary of the invention
The objective of the invention is to improve the deficiency of prior art, provide a kind of simple in structure, easy and simple to handle, easy to repair, can realize the full hydraulic driving forklift that infinite variable speed double static pressure motor drives.
For realizing above-mentioned purpose, the present invention takes following technical scheme:
The fork truck of the all-hydraulic transmission that a kind of double static pressure motor drives; It includes back counterweight, steeraxle, overhead guard, driving engine, bonnet, drive axle, door frame, shelf and hydraulic efficiency pressure system; Said each parts are arranged on the frame, on this frame, also are provided with drive controlling hydraulic efficiency pressure system and two hydrostatic machines; Described drive axle is split type; Each divides an end of drive axle to connect wheel, and the other end connects a said hydrostatic machine, makes said wheel by these two hydrostatic machine direct drives; Two these hydrostatic machines connect said drive controlling hydraulic efficiency pressure system; Said drive controlling hydraulic efficiency pressure system connects said hydraulic efficiency pressure system, and said hydraulic efficiency pressure system connects said driving engine, and said hydraulic efficiency pressure system provides power by said driving engine.
Hydrostatic machine wherein is the abbreviation of static pressure CD-ROM drive motor.
The settings of parts on frame such as back counterweight, steeraxle, overhead guard, driving engine, bonnet, drive axle, door frame, shelf and hydraulic efficiency pressure system on the said fork truck are identical with fork truck of the prior art with mutual connection structure.
The connection structure of above-mentioned hydrostatic machine and said minute drive axle can be: drive axle comprised an axle tube in said minute; One drive wheel semiaxis is set in this axle tube; One end of this drive wheel semiaxis connects the wheel hub of wheel, and said hydrostatic machine and axle tube connect firmly, and the output shaft of said hydrostatic machine connects firmly through a coupler and said drive wheel semiaxis; Make the output shaft of said hydrostatic machine directly moment of torsion passed to the drive wheel semiaxis, the drive wheels rotation through said coupler.
Can on the casing of hydrostatic machine and said axle tube, flange be set, tie bolt on two flanges makes hydrostatic machine be bolted on the axle tube of drive axle with flange.
Particularly; One motor positioning step can be set on the output shaft of said hydrostatic machine; One endoporus step is set in the mouth of pipe of said axle tube, on this endoporus step against an end that sets firmly a bearing, at the other end of this bearing against an end that sets firmly a spacer; Motor positioning step on the said hydrostatic machine is against the other end that is installed in this spacer; On this bearing cone, set firmly gear coupling in, the external tooth of the coupling end setting of said drive wheel semiaxis and hydrostatic machine output shaft and said interior gear coupling coupling is plugged in to connect in gear coupling in this and fixes.
Said bearing also can be self-aligning ball bearing for being deep groove ball bearing, perhaps is self-aligning roller bearing.
On this wheel nave, connect wheel, wheel nave is provided with the braking mechanism identical with prior art.
Said hydraulic efficiency pressure system is included in the Hydraulic Elements and the Hydraulic Pump of all fuel feeding such as mechanism that turn to lifting, leaning device and control steeraxles such as the said door frame of control, shelf in the existing fork truck; Its connection structure is a prior art; Hydraulic Pump in this hydraulic efficiency pressure system is a volume adjustable hydraulic pump; It is connected with said driving engine, and this connection structure is a prior art.Volume adjustable hydraulic pump in this hydraulic efficiency pressure system is connected with said drive controlling hydraulic efficiency pressure system through hydraulic tubing; This drive controlling hydraulic efficiency pressure system is connected with two said hydrostatic machines; Make above-mentioned hydrostatic machine by the controllable capacity pump fuel feeding of engine drives, said controllable capacity pump can be an autonomous type plunger variable Hydraulic Pump.This controllable capacity pump is hydraulic efficiency pressure system lifting, the power element fuel feeding that tilts, turn to simultaneously.
The rotating speed of above-mentioned hydrostatic machine, rotation direction, stop to control by the drive controlling hydraulic efficiency pressure system, with the stepless change of realizing fork truck, forward-reverse and about turn to.
Said drive controlling hydraulic efficiency pressure system comprises two groups of check valves, a change-over valve and a Das Gaspedal; Two groups of check valves are connected with two said hydrostatic machines respectively; Said change-over valve is connected with two groups of these check valves; This change-over valve connects the volume adjustable hydraulic pump in the said hydraulic efficiency pressure system, connects said driving engine then, and said Das Gaspedal connects said driving engine; A hydraulic steering gear that comprises in the said hydraulic efficiency pressure system; It connects and composes two every group through control oil pipe and two groups of said check valves and turns to hydraulic control one-way valve to be connected with said hydrostatic machine with two oil return hydraulic control one-way valves cooperations; This hydraulic steering gear connects the hydraulic efficiency gear on the said steeraxle through oil pipe simultaneously, and this is a prior art.
Said change-over valve can be manual two position and four-way reversing valves.Be connected with the manual lever of fork truck in the use, regulate change-over valve, realize the conversion that moves forward and backward of fork truck through control lever.
Said hydraulic steering gear is connected the diff that then substitutes existing fork truck and under the drive of steeraxle, realizes this fork-truck steering with the drive controlling hydraulic efficiency pressure system.
The beneficial effect of the utility model is:
1, the fork truck of the all-hydraulic transmission of this double static pressure motor driving is compared with the hydraulic transmission fork truck with traditional machinery; Full hydraulic driving forklift need not to install complicated drivings device such as power-transfer clutch, change speed gear box, main reduction gear, diff, has advantage simple in structure, easy and simple to handle, for ease of maintenaince.
2, this full hydraulic driving forklift has been removed the intermediate transfer link of moment basically, and driving efficiency is high, and loss in efficiency is little, helps improving efficiency of energy utilization.
3, this full hydraulic driving forklift has been stopped the noise that the machine driven system gear mesh produces, and the complete machine noise obviously descends, and helps improving working environment, and the protection operator's is healthy.
Description of drawings
Fig. 1 is the structural representation of the fork truck of the all-hydraulic transmission that drives of double static pressure motor provided by the invention.
Fig. 2 is the transmission principle scheme drawing of the fork truck of the all-hydraulic transmission that drives of double static pressure motor provided by the invention.
Fig. 3 is the drive controlling hydraulic efficiency pressure system part control principle scheme drawing of of the present invention full hydraulic driving forklift.
Fig. 4 is the sectional structure scheme drawing of drive part of the present invention.
Fig. 5 is the main TV structure scheme drawing of axle tube in the drive part of the present invention.
Fig. 6 is the left TV structure scheme drawing of Fig. 5.
Fig. 7 is the main TV structure scheme drawing of interior gear coupling in the drive part of the present invention.
Fig. 8 is the left TV structure scheme drawing of Fig. 7.
The specific embodiment
Referring to Fig. 1~shown in Figure 7: the full hydraulic driving forklift that a kind of double static pressure motor drives; It includes back counterweight 1, steeraxle 2, overhead guard 3, driving engine 4, frame 5, bonnet 6, drive axle 7, door frame 8, shelf 9, hydraulic efficiency pressure system 11; Said each parts are set on frame 5; Except that drive axle 7, the miscellaneous part of said fork truck is identical with common fork truck.
On this frame, also be provided with a drive controlling hydraulic efficiency pressure system 10, two hydrostatic machines 13; Said drive axle is split type, and each divides an end of drive axle 7 to connect the wheel (not shown), and the other end connects a said hydrostatic machine 13; Make said wheel by these two hydrostatic machine 13 direct drives; Two these hydrostatic machines 13 connect said drive controlling hydraulic efficiency pressure system 10, and said drive controlling hydraulic efficiency pressure system 10 connects said hydraulic efficiency pressure system 11, and said hydraulic efficiency pressure system 11 connects said driving engine 4.
The present invention promptly be original fork truck be used for pick out a hydraulic circuit to hydraulic efficiency pressure system 11 such as the lifting of door frame 8, steeraxle 2 etc., the power element fuel feeding that tilts, turn to; Form a drive controlling hydraulic efficiency pressure system 10, replace original by driving engine 4 to mechanical transmission mechanisms such as the power-transfer clutch the wheel, change speed gear box, main reduction gear, difies.
Above-mentioned drive controlling hydraulic efficiency pressure system 10 by two four-way hand change over valves 24, four oil return hydraulic control one-way valves 25, four turn to hydraulic control one-way valve 26 and Das Gaspedal 27 to form, with moving velocity, the forward-reverse of control fork truck with turn to.
Concrete structure in existing hydraulic efficiency pressure system 11, comprises a volume adjustable hydraulic pump 12 referring to Fig. 2, and it is connected with driving engine 4, and this connection structure is a prior art.This volume adjustable hydraulic pump 12 is connected with fluid control part 28 of the prior art; Simultaneously; This hydraulic efficiency pressure system is connected with said drive controlling hydraulic efficiency pressure system 10 through hydraulic tubing; This drive controlling hydraulic efficiency pressure system 10 is connected with two hydrostatic machines 13, makes controllable capacity pump 12 fuel feeding that above-mentioned hydrostatic machine 13 is driven by driving engine 4, and controllable capacity pump 12 is autonomous type plunger variable Hydraulic Pumps.
As shown in Figure 3; Said drive controlling hydraulic efficiency pressure system comprises two groups of check valves, a change-over valve 24 and a Das Gaspedal 27; Two groups of check valves are connected with two hydrostatic machines 13 respectively, and change-over valve 24 is connected with two groups of these check valves, the volume adjustable hydraulic pump 12 that change-over valve 24 connects in the hydraulic efficiency pressure system 11; Then connect said driving engine 4, Das Gaspedal 27 connects driving engine 4; A hydraulic steering gear 23 that comprises in the hydraulic efficiency pressure system 11; It connects and composes two every group through control oil pipe 23a with two groups of said check valves and turns to hydraulic control one-way valve 26 to cooperate with two oil return hydraulic control one-way valves 25; Be connected with hydrostatic machine 13, this hydraulic steering gear 23 connects the hydraulic efficiency gear (not shown) on the said steeraxle 2 through oil pipe simultaneously.
Change-over valve 24 can be manual two position and four-way reversing valves, and manual handle 10a wherein is arranged in the operator's compartment, regulates change-over valve through control lever 10a, realizes the conversion that moves forward and backward of fork truck.
And said hydraulic steering gear 23; Just have in the hydraulic efficiency pressure system 11 on original fork truck; It is to be used to control the hydraulic actuating cylinder that fork truck rear wheel steeraxle 2 turns to, and in this embodiment, is on this hydraulic steering gear 23, to pick out control oil pipe 23a; Be connected to turning on the hydraulic control one-way valve 26 in two groups of said check valves, this hydraulic steering gear 23 still can be manually to control through the direction rotating disk 11a in the operator's compartment.Rotate this hydraulic steering gear 23, its oil outlet pipe has pressure oil and flows out, and pressure will pass to the Long-distance Control mouth that turns to hydraulic control one-way valve in one group of check valve of a side through control oil pipe 23a; It is coupler lock that in the work this turns to hydraulic control one-way valve; And the also locking simultaneously of corresponding oil return hydraulic control one-way valve, this side hydrostatic machine quits work, and turns to hydraulic control one-way valve and the not locking of oil return hydraulic control one-way valve in one group of check valve of opposite side; This side hydrostatic machine works on; At this moment, hydraulic steering gear 23 ground as prior art is controlled for the steeraxle 2 of a corresponding side simultaneously, makes this fork truck under the drive of steeraxle 2, realize turning to.
Above-mentioned fork truck, when Das Gaspedal is stepped on diverse location 27 times, driving engine 4 drives the different flow of controllable capacity pump 12 outputs with different rotating speed and gives hydrostatic machine 13, realizes the stepless change of fork truck.The manual handle 10a that is provided with in the operator's compartment through the overhead guard formation handles the handle of two four-way hand change over valves 24, and hydraulic oil gets into two hydrostatic machines 13 from different hydraulic fluid ports, realizes moving forward and backward of fork truck.Rotate the direction rotating disk 11a of hydraulic steering gear 23, a side turns to hydraulic control one-way valve 26 to accept the hydraulic pressure command SELF CL that the Long-distance Control oral instructions come, and left and right sides hydrostatic machine 13 1 side work one side is static, and fork truck is realized turning under the drive of steeraxle 2.
The structure of said drive controlling hydraulic efficiency pressure system can have various ways, everyly can control hydrostatic machine running and can all be fine by the hydraulic control system of hydraulic steering gear control simultaneously.
As shown in Figure 4; Divide drive axle 7 to comprise an axle tube 15; One drive wheel semiaxis 16 is set in this axle tube 15; One end of this drive wheel semiaxis 16 connects the wheel hub of wheel, and hydrostatic machine 13 connects firmly with axle tube 15 (like Fig. 5, shown in 6), and the output shaft 21 of hydrostatic machine 13 connects firmly with drive wheel semiaxis 16 through a coupler 17.
Particularly; On the casing of hydrostatic machine 13 and axle tube 15, flange is set; Tie bolt 20 on two flanges; Hydrostatic machine 13 usefulness flanges are bolted on the axle tube 15 of drive axle, and the output shaft 21 of hydrostatic machine directly passes to the drive wheel semiaxis with moment of torsion through said coupler 17, the drive wheels rotation.
One motor positioning step 22 is set on the output shaft of hydrostatic machine; One endoporus step is set in the mouth of pipe of axle tube 15; On this endoporus step against a fixing deep groove ball bearing 18; Against setting firmly a spacer 19, the motor positioning step on the hydrostatic machine 13 sets firmly gear coupling 17 in (like Fig. 7, shown in 8) against the other end that is installed in spacer 19 on the inner ring of this ball-bearing casing 18 at an end of this ball-bearing casing 18; The external tooth of the coupling end setting of drive wheel semiaxis 16 and hydrostatic machine output shaft 21 and interior gear coupling 17 couplings is plugged in to connect in the gear coupling 17 in this and fixes.
Therefore, above-mentioned hydrostatic machine 13 is fixed on the drive wheel axle tube 15 through bolt 20, and hydrostatic machine output shaft 21 directly passes to drive wheel semiaxis 16 with moment of torsion through interior gear coupling 17, and drive wheels 14 is rotated.Interior gear coupling 17 is fixed on through deep groove ball bearing 18 among the endoporus of axle tube 15, and motor positioning step 22 is pressed on bearing 18 on the endoporus step of axle tube 15 through spacer 19, effective location of gear coupling 17 in realizing.
Aforementioned deep groove ball bearing can be with self-aligning ball bearing or self-aligning roller bearing replacement.
Autonomous type plunger variable Hydraulic Pump 12 fuel feeding that above-mentioned hydrostatic machine 13 is driven by driving engine 4, this pump simultaneously for the hydraulic efficiency pressure system lifting, tilt, turn to modulated pressure element 28 fuel feeding of power element.
The present invention has removed complicated intermediate power transmission mechanism, thereby has improved driving efficiency owing to adopt two hydrostatic machine direct drive wheel revolutionss, has reduced material consumption, has improved the Operation and maintenance performance of fork truck product.
On this wheel nave, connect wheel, wheel nave is provided with braking mechanism, and described braking mechanism and prior art are just the same, parking brake (Parking) stop with liquid (when going) combine, do not give unnecessary details at this.