CN2109447U - Double-acting variable vane pump - Google Patents

Abstract

A double-acting variable vane pump features that the stator is movable in disconnected mode, and is arranged in rectangular internal cavity of pump casing, and several auxiliary vanes are added to rotor of pump to isolate and seal high-and low-pressure cavities in volume. The two balancing devices of the stator are respectively arranged at the outer sides of the two stators. Can be used as a hydraulic pump and is directly driven by a diesel engine or a gasoline engine; it can also be used as hydraulic motor, and the hydraulic motor formed from parallel circuit can be respectively mounted in every wheel, and can directly implement driving and braking action. It is mainly used for the driving system of hydraulic displacement type automobile and also can be used for other hydraulic transmission systems. Has the characteristics of small volume, simple structure, easy manufacture and the like.

Description

Double-action variable quantity paddle pump

The utility model relates to a kind of double-function variable vane pump.Can be used as oil hydraulic pump, directly drive by diesel engine or petrol engine; Also can be used as oil hydraulic motor, the oil hydraulic motor that the shunt circuit is formed is contained in respectively in every wheel, directly works driving and braking action.It is mainly used in the drive system of hydraulic volume formula automobile.

(application number 89108767.2) narrated a kind of double-action automatic variable breakaway stator paddle pump in " hydralic drive automobile " application for a patent for invention.This pump and common vane pump difference are that stator is a disconnecting type, and can move, and between stator and pump case inwall one ramp blocks are set, and ramp blocks and stator flange are tangent; Place a return spring at the bead opposite side; At the stator end balance spring that joins, and a regulating arm is set, regulating arm flies iron control by being installed in outer centrifugal of pump.On the one hand, regulating arm backs down stator along with the rotation of motor towards centrifugal direction, and engine speed is high more, and the position that stator is backed down is also big more.On the other hand, the pressure difference that the hydraulic coupling that changes with payload in the centrifugal force of blade and the system in the rotor causes is ceaselessly automatically being adjusted the position of stator by balance spring, realizes the stepless automatic transmission of Variable quantity oil hydraulic pump.The vane pump end cap lifting surface area of Gou Chenging is big thus, and sealing is reliable inadequately.

The purpose of this utility model provides the double-function variable vane pump after a kind of the improvement, is improved on the basis of above-mentioned double-action automatic variable breakaway stator paddle pump, makes it structurally with on the manufacturing process all obtain simplifying with perfect.

The stator of double-function variable vane pump is that disconnecting type is removable, one side stator is half moon, stator is placed in the rectangular pump case inner chamber, increases several pairs blade on the rotor of pump, plays the high low pressure chamber in isolation and the sealed volume.Two balance oil pockets place the outside of two stators respectively, and by two equalizing pistons and two Regulation springs and adjust the pressure equaliser that sieve bolt is formed stator, the square liner plate of two block lengths installs respectively in the both sides of two stator center, and its position abuts against on the pump housing inwall.

Accompanying drawing is the center line radial section schematic representation of double-action Variable quantity vane pump.

1, housing 2, stator 3, liner plate 4, rotor 5, primary blades 6, back blades 7, filler opening 8, primary blades spring 9, back blades spring 10, oil outlet 11, equalizing piston 12, Regulation spring 13, adjustment sieve bolt 14, adjustment pad 15, space 16, balance spring

Double-action disconnecting type stator 2 of the present utility model is placed in the rectangular pump case inner chamber in two, and stator can move left and right.On the rotor of pump, increase several back blades 6, play the high low pressure chamber in isolation and the sealed volume.Two balance oil pockets place the outside of two stators respectively, and by two equalizing pistons 11 and two Regulation springs 12 and adjust the pressure equaliser that sieve bolt 13 is formed stator.The balance spring 16 that is contained between stator and the housing slip surface plays the auxiliary adjustment effect when high low speed, guarantee that pump and motor can not lose lotus or overloading.The square liner plate 3 of two block lengths installs respectively in the both sides of two stator center lines, and its position abuts against on the pump housing inwall, and liner plate and stator terminal gap are adopted and adjusted pad 14, and pad is placed between liner plate and the pump wall.Press close to the end face of liner plate at stator, stator or liner plate are milled with the space of a constant volume, and its space is respectively with near oil suction chamber or go out oil pocket and communicate, and its effect is to reduce stiction or the kinetic force of friction of stator to liner plate.

Double-function variable vane pump is during as oil motor, and its action principle is:

High pressure oil is by filler opening 7 input hyperbaric chambers (action principle on this motor the right only is described here, and the left and right sides is identical), and oil pressure acts directly on and produces rotary thrust on the primary blades 5 and make rotor 4 reverse rotation.Oil pressure acts directly on the semicircular inner walls of disconnecting type stator 2 on the other hand, because the balanced action of (counter balance pocket has oil duct to communicate with hyperbaric chamber) equalizing piston 11 in the pressure balance chamber is arranged, extrapolability on the stator just is controlled in the suitable scope, the outer passing amount of stator is carried out adjustment by Regulation spring 12 by regulating sieve bolt 13, because stator and piston exist a fixing area difference (stator is greater than piston), increasing when rotor load that (vehicle driving up or starting) be reflected in the volume is that oil pressure increases, the mobile laterally Regulation spring of stator is compressed until arriving on the equilibrium position, this moment, the motor volume increased, moment of torsion increases simultaneously, and rotating speed slows down.When rotor load reduces (when vehicle is in level road or descending), oil pressure also reduces in the volume, and stator closes up to rotor under the effect of Regulation spring, and until being equilibrated on the position, this moment, the motor volume reduced, and moment of torsion also reduces, and rotating speed improves.

When the gate valve of control turnover oil pipe was in closed condition, motor did not change and a braking action.The change control valve is when the reverse input high pressure oil of motor, because counter balance pocket communicates equalizing piston disequilibrium pressure with former filler opening 7, stator is compression adjustment spring and be in maximum outward position easily, oil motor reversing this moment, moment of torsion maximum but rotating speed is the slowest, its characteristic and automobile match.

Through the effect of control valve, when the return tube oil return was obstructed, pressure raise rapidly in the volume, and the stator pressurized is in maximum outward position, and oil motor slows down at once until parking.Because when braking, the pressure difference of stator and equalizing piston is bigger, and equalizing piston often is in the decompression state during braking, so outer fast the moving of stator is to be guaranteed.

Use its principle to be as oil hydraulic pump: double cropping is the reverse action of oil motor as oil hydraulic pump, and difference is not: the lifting surface area of equalizing piston is greater than the lifting surface area of stator, and this is just in time opposite with oil motor.To increase stator be not to move but close up to rotor outward to pressure in the system, and the oil pressure in volume, blade centrifugal force, spring are regulated after these three power of power average out, and stator just rests on the suitable position.System pressure is high more, and the pressure difference of stator and equalizing piston is big more.Stator closes up to rotor direction, and Regulation spring length increases, and elastic force reduces, and moves on on the new position until stator.This shows that system pressure constantly changes, the volume of pump changes, and its output flow also changes.

For preventing that engine speed from causing the too much pressure difference that forms on the stator of blade centrifugal force decline of pump excessive when descending, stator is too drawn close rotor, oil pump will not have oil output, therefore at the appropriate location of stator and housing device low speed balancing spring 16, this spring not only works when oil pump low speed, also works when oil pump high speed or hypervelocity.

The utility model uses as oil motor, and it is big to have slewing range, and low speed torque is big, and volume is little, simple in structure, it is also easy to make, and is suitable as the wheel-side motor of hydralic drive automobile most.If cooperate, be applicable to that promptly heavy goods vehicles, in-between car also are applicable to sedan car, motorcycle with variable displacement pump; Promptly be applicable to the novel wheel of all-hydraulic transmission, also can be made into the automatic hydraulic gearbox, replace the speed-changing gear box of existing vehicle.Be used for dilly can be directly and constant flow paddle pump or quantitative plunger pump supporting.The utility model is applicable to all gears that all are not high to the rotating speed accuracy requirement simultaneously.

Claims (5)

1, a kind of stator is a movably double-action Variable quantity vane pump of disconnecting type, the one side that it is characterized in that stator is half moon, stator is placed in the rectangular pump case inner chamber, on the rotor of pump, increase several back blades, two Equilibrators of stator place the outside of two stators respectively, the square liner plate of two block lengths installs respectively in the both sides of two stator center, and its position abuts against on the pump housing inwall.

2, double-action Variable quantity vane pump according to claim 1 is characterized in that the pressure equaliser of stator is made up of balance oil pocket, equalizing piston and Regulation spring and adjustment sieve bolt in the outside that places stator.

3, vane pump according to claim 1 is characterized in that between stator and housing slip surface balance spring being housed, and helps out when high low speed.

4, vane pump according to claim 1 is characterized in that liner plate and stator terminal gap employing adjustment pad, and pad is placed between liner plate and the pump wall.

5, vane pump according to claim 1 is characterized in that pressing close at stator the end face of liner plate, is milled with the space of a constant volume on stator or liner plate, and its space is respectively with near oil suction chamber or go out oil pocket and communicate.

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