CN101029642A

CN101029642A - Variable gear pump

Info

Publication number: CN101029642A
Application number: CN 200710061683
Authority: CN
Inventors: 安致民
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-11
Filing date: 2007-04-11
Publication date: 2007-09-05

Abstract

A variable quantity gear pump of the invention solves a difficult key in gear bump application for many years. The difficult is that when follower gear make axial displacement it produce working volume and result to can't form obturation state when two gears in turning. The invention offered pump four special construction bushes. It has axial circle-arc slot bush and cylindrical bush, and they are stagger and support a pair of gears. In this way, gear and bush can make axial displacement in-step motion without bar and interference in bump's body. During displacement, the length of mesh is changed. Because the changing working volume is in the obturation state which formed by mesh tooth surface and bush closing to gear surface, so the gear bump achieves no leak variable. The invention can produce variable gear bump of different capability and purpose, and it can take the place of plunger pump and wing pump in certain area. Its technology and economy effect is signality.

Description

Variable gear pump

Technical field

The invention belongs to hydraulicdriven liquid capacity formula machinery in the mechanical engineering.

Background technique

Various oil hydraulic pumps in the positive displacement liquid transmission, mainly contain three kinds of gear pump, plunger pump and vane pumps, up to the present, plunger pump and vane pump can be made the variable displacement pump of various ways, and the product that has gear pump only and still do not have so far Variable quantity is applied in the mechanical engineering.

Summary of the invention

Take the purpose of variable in view of work mechanism and be to improve automaticity, reduce the volume and weight of equipment, more can reduce vibration, noise and the temperature rise of whole mechanical system, improve the stationarity and the total efficiency of total system, to reach the energy-saving and environmental protection effect.Therefore, the variable speed control system replaces quantitative throttle grverning system and has obtained extensive use.

Gear pump is being compared with under the power condition with plunger pump, vane pump, obviously have simple in structure, volume is little, lightweight advantage.But because the working principle and the structural condition of gear pump, realize its displacement variation, objectively exist very big difficulty, also people expect the reason that variable gear pump is not for a long time seen application so far just, its technical difficulty key is how the gear in the pair of meshing sets up a transformable volume, and can be in the closed state.

For achieving the above object, the invention provides a kind of variable gear pump.On the basis of general quantitative gear pump working principle, make in the equal gear pair of a pair of facewidth, driven shaft gear carries out displacement vertically, thereby change the length of action of gear pair, swept volume is changed, reach the discharge capacity increase and decrease, correspondingly the gear pump output flow changes, and realizes Variable quantity.

Key of the present invention is, two side surface bodies of a pair of gear with the side end face will be affixed on, that is the lining (axle) with smooth end face and energy supporting gear axle overlaps, its profile is made the cylindrical body that equates with the outside diameter of gear, wherein has axial curve bath on an outer cylinder surface, groove arc radius equates with tooth radius, the degree of depth is the poor of the outside diameter of gear and a pair of Gear center distance, two of physical dimension arc groove linings and two cylinder linings are staggered like this, and and a pair of gear pack in the oil pump case, then can realize without hindrance grade of gear and lining, do not have the ground of interference and carry out same moved further vertically.During displacement was carried out, length of action changed, and the swept volume that constantly changes then just be present in the closed state of the bush end face composition that mesh tooth face and gear tooth end face are adjacent to, thereby gear pump has been realized leak free variable.

The present invention is equipped with the lining of four special constructions that play supporting role in the front cover 1 that constitutes the pump seal body, rear end cover 9, pump case 6.Suit down cylinder lining 7 on the driving shaft gear 2 right-hand member axles, suit arc groove lining 3 on the left end shaft, and this two lining is close to driving shaft gear 2 gear teeth both sides end faces, and is close between front cover 1 and the rear end cover 9, make 2 rotations of driving shaft gear transferring power, do not move axially and have.What be meshed with driving shaft gear 2 is the driven shaft gear 4 that the facewidth equates, suit down arc groove lining 8 on its right-hand member axle, and suit cylinder lining 5 on the left end shaft.

Above-mentioned last arc groove lining 3 and following arc groove lining 8, its external diameter equates with the outside diameter of gear, its cylndrical surface has axial curve bath respectively with on last cylinder lining 5, following cylinder lining 7 intersection areas, and groove arc radius equates that with tooth radius the arc groove depth is the poor of the outside diameter of gear and two Gear centers distance.

The present invention select for use finalize the design produce manually, surge or the control gear of servo mode, and by the flange of selected device, the Conncetion cimension of axle head, to rear end cover 9 and down arc groove lining 8 right-hand members carry out corresponding size and connect.

Like this, according to operating mode, control gear can order about down arc groove lining 8 move left and right.Instantly arc groove lining 8 is promoted left, then driven shaft gear 4 and the also same left vertically moved further of last cylinder lining 5 in the running; When arc groove lining 8 is reclaimed instantly, be subjected to zone of high pressure, cylinder lining 5 left side (H) effect simultaneously, the same moved further of cylinder lining 5 and driven shaft gear 4 in the promotion to the right to the right.Because the arc groove lining is staggered corresponding with the cylinder lining, when driven shaft gear 4 was done move left and right, the cylinder lining also carried out same moved further along the axial groove of circular arc lining.Therefore can realize without hindrance shelves, not have the displacement of the ground of interference; Owing to be in gapless synchronous shift with two linings of being close in driven gear 4 displacements, therefore guarantee to form enclosed volume again.

Above-mentioned, the contact length of gear pair is changing, and the swept volume that pump constantly changes is in the closed state all the time.Because the increase and decrease of discharge capacity, correspondingly the gear pump output flow changes, thereby has realized the Variable quantity of gear pump.

The displacement of driven shaft gear 4 does not allow to occur breaking away from fully engagement, and answering spacing is 1/6 of tooth length to still having length of action---and 1/8.

When driven shaft gear 4 displacement vertically, realize reducing discharge capacity, when reaching spacing, by the volume of pump self leak and progressively UNICOM be located at leakage way in the pump case 6, can realize minimum discharge, up to zero delivery.

According to above technological scheme, can design, produce the gear pump with variable capacity and the variable gear motor two big series products of different flow, pressure and control mode, and, on the basis of variable displacement pump, can also derive the combined pump and the integration pump of various functions according to the requirement of operating mode and system.

Remarkable technological progress and effect that the present invention obtains are:

1, the invention solves a key that is difficult to go beyond that perplexs for many years in gear pump is used, promptly when driven gear in the gear pair carried out axial displacement, formed swept volume can't form closed state, caused the failure of gear pump variable.The structural type of the sealing mode of swept volume and vital part in foundation and the utilization displacement variation process provided by the invention (be lining or claim side surface body) can design, produce the variable gear pump of (or transforming quantitative gear oil pump) different performance and purposes.

2, good effect of the present invention is, on the basis of the original advantage of gear pump, realize Variable quantity after, will replace the plunger pump and the vane pump of Variable quantity within the specific limits, its technology, economic effect are significant.

Description of drawings

Fig. 1 is a structural representation of the present invention, and wherein " H " is the zone of high pressure, and " L " is low pressure area, i.e. oil back region;

Fig. 2 is that the A-A of Fig. 1 is to sectional view;

Fig. 3 is that the B-B of Fig. 1 is to sectional view;

When Fig. 4 is the pump peak rate of flow, position view;

When Fig. 5 is the pump minimum discharge, position view.

Now the present invention will be further described with accompanying drawing in conjunction with the embodiments:

1, according to part feature and layout, adopt Sealing sealing or clearance seal respectively, with the separation that realizes the height nip with stop the leakage of zone of high pressure to low pressure area, the gap sealed degree of reliability is decided by the foundation that is provided with of element precision and pressure area.Pump case 6, last arc groove lining 3, last cylinder lining 5 and front cover 1 have formed a zone of high pressure (H), force above-mentioned two bush end face to compress the left side wheel increment face of driving shaft gear 2 and driven shaft gear 4 simultaneously, two shaftgear its right end face also compress the bush end face of pasting mutually simultaneously.And formed sealed volume with the flank of tooth Line of contact of continuous engagement, force high pressure oil from the output of oil pump outlet (see figure 2).

2, flow to by the seepage in the work, on front and rear cover and pump case, set up the return flow line.

3, cylinder lining 5 afterbodys of driven shaft gear left end can install the cylinder thrust spring additional, when starting or turning the operating mode of flow down, can in time set up the pressure area to guarantee pump, make pump enter normal working, to improve startability.

4, according to the flange of selected automatic servo control gear, the Conncetion cimension of axle head, reaching down to rear end cover 9, arc groove lining 8 right-hand members carry out the connection of corresponding size.(not drawing among the approved product figure)

5, the concrete running of pump is described below:

The control gear that operation is selected for use, order about down arc groove lining 8 move left and right, again because the effect that pressure oil is being born in last cylinder lining 5 big end left sides, the both sides gear teeth end face of driven shaft gear 4 pastes mutually with the two ends bush end face all the time, and grip and between two bush end face, carry out left and right sides synchronous shift, therefore change two gear meshing (contact) length, reached the variation of discharge capacity.Correspondingly the gear pump output flow changes, thereby has realized the Variable quantity of gear pump.

Claims

1, variable gear pump, it comprises pump and control gear two-part, it is characterized in that at the front cover (1) that constitutes the pump seal body, rear end cover (9), in the pump case (6), suit down cylinder lining (7) on driving shaft gear (2) the right-hand member axle, suit arc groove lining (3) on the left end shaft, what be meshed with driving shaft gear (2) is the driven shaft gear (4) that the facewidth equates, suit down arc groove lining (8) on its right-hand member axle, suit cylinder lining (5) on the left end shaft, the external diameter of wherein going up arc groove lining (3) and following arc groove lining (8) equates with the outside diameter of gear, in its cylndrical surface respectively with last cylinder lining (5), following cylinder lining (7) joins the position mutually and has axial curve bath, the curve bath radius equates that with tooth radius the arc groove depth is the poor of the outside diameter of gear and two Gear centers distance.

2, variable gear pump according to claim 1, it is characterized in that selecting for use finalized the design produce manually, surge or the control gear of servo mode, and flange, the axle head Conncetion cimension of pressing selected device, reaching down to rear end cover (9), arc groove lining (8) right-hand member carries out the corresponding size connection.