CN2097295U

CN2097295U - Internal-engagement internal cycloidal oil pump

Info

Publication number: CN2097295U
Application number: CN 91215351
Authority: CN
Inventors: 王浩钧; 王时正
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-16
Filing date: 1991-04-16
Publication date: 1992-02-26

Abstract

The utility model relates to an inner-shaft pump whose matched members are mutually engaged. A disc whose circumference is provided with an arc slot and a roller which is embedded in the arc slot are adopted as inner rotors, and the outer rotor is a gear ring of a hypocycloidal tooth, wherein, the end faces the front and the rear covers are provided with two sets of flow-matching slots which are arranged by being deflected for an angle from an inner and an outer rotor shaft lines; the middle of each of the flow-matching slots is provided with a new structure of a thin seam oil-drainage slot. The utility model, which has the advantages of low noise, small pulsation, high efficiency, great pressure-bearing capacity, etc., can operate both forward and backward, and can serve as an oil motor.

Description

Internal-engagement internal cycloidal oil pump

The utility model relates to internal-axis type, the intermeshing pump of mating component.

The 34th piece of chapter 2 34-15 page or leaf (China Machine Press of mechanical engineering manual the 6th volume, September nineteen eighty-two version) interior engagement cycloid rotor pump structure disclosed, this pump has the flow groove of symmetrical distribution on the end face of forward and backward lid, but since pump in oil suction and oil extraction process flow and the variation of pressure be not symmetrical distribution along rotor axis, certainly lead to the tooth portion mechanical impact and the entrap phenomenon that occur with respect to pressure area annular flow groove volume-variation, influence the further raising of pump performance index.

The purpose of this utility model is a kind of novel interior engagement hypocycloid oil pump of design, to satisfy the be used as power usage requirement in source of high pressure, little pulsation, low noise, high-quality hydraulic system.

The purpose of this utility model is to mesh in existing on the hypocycloid rotor pump, this pump is made up of critical pieces such as internal gear pair, protecgulum, bonnet eccentric bushing, pump shafts, and by on the end face of forward and backward lid, be provided with shape identical, with respect to the asymmetric two groups of annular flow grooves of inner and outer rotors axis with open in the centre of two flow grooves that a finedraw drain pan realizes.

Accompanying drawing 1 is the axial sectional view of the utility model, and Fig. 2 is the A-A sectional view, and Fig. 3 is the B-B sectional view.1 is pump shaft among the figure, and 2 is flat key, and 3 is seal ring, and 4 is protecgulum, 5 is lubrication groove, and 6 is bearing, and 7 is ring washer, and 8 is eccentric bushing, 9 is bonnet, and 10 is flat key, and 11 is internal rotor, and 12 is the inner cycloidal gear external rotor, 13 is screw, and 14 is spill port, and 15 is oil-sucking hole, and 16 is oil drainage hole, 17 is seal ring, and 18 is bearing, and 19 is oilhole, and 20 is lubrication groove, 21 is the finedraw drain pan, and 22,23 is the flow groove, and 24 is drain pan, and 25 is roller.

In conjunction with the accompanying drawings, provide embodiment of the present utility model.

The protecgulum 4 of bearing 6 is housed, the eccentric bushing 8 of inner cycloidal gear external rotor 12 is housed, the bonnet 9 of bearing 18 is housed, fastening in aggregates with screw 13, bearing 18 has a little oilhole 19, be shaped on the operative end surface of front cover 4 and rear end cover 9 (end face that fits with eccentric bushing 8) shape identical, with respect to asymmetric two the annular flow grooves 22 of inner and outer rotors axis and 23, the i.e. setting of two annular flow grooves is angles of relative inner and outer rotors axis tilt, and each is connected with oil-sucking hole 15, the oil drainage hole 16 of band pipe thread.On the operative end surface of bonnet 9, on the central axis of oil pump, also be shaped on finedraw drain pan 21, the one end is communicated with oilhole 19.The pump shaft 1 of band flat key 2 is installed in the bearing 6 of band lubrication groove 5 and is with in the bearing 18 of lubrication groove 20, the internal rotor 11 of the band drain pan 24 that connects with flat key 10 is installed on it, and with two ring washers, 7 fixedly connected being integral, internal rotor is one to have the disk of arc groove on circumference.Roller 25 is packed in the close-fitting arc groove of internal rotor 11, forms with the inner cycloidal gear of inner cycloidal gear external rotor 12 tooth portions engagements and pays.Two

seal rings

3 and 17 prevent that oil liquid leakage from going out outside the pump.As shown in the figure, the fluid that finedraw drain pan 21 releases enters oil sump through oilhole 19, drain pan 24,

lubrication groove

20,5 and spill port 14.When power drives pump shaft 1 by flat key 2, drive is installed in the internal rotor 11 on the pump shaft 1, with roller 25, and be installed in inner cycloidal gear external rotor 12 rotation in the eccentric bushing 8 with what be meshed with roller 25, because the oil pocket volume between two line of contact changes from small to big, just oil is sucked from oil-sucking hole 15, flow groove 23, the oil pocket volume is from large to small then, fluid is just discharged from flow groove 22, oil drainage hole 16, finishes oil suction and oil extraction process.Present embodiment forms the arc toothed original gear that replaced with roller, be because roller can move radially in arc groove, because the centrifugal force of gear rotation and the thrust of pressure in pressure cavity oil, roller can be close on the external rotor hypocycloid flank of tooth, play the effect of dynamic seal (packing), further improve volumetric efficiency and working pressure.

Engagement Swing line oil pump in the utility model, owing to adopt two annular flow grooves to be asymmetric with the inner and outer rotors axis arranged, the tooth portion mechanical impact that has occurred with respect to pressure area annular flow groove volume-variation when having eliminated working gear; Adopted the finedraw drain pan, got rid of bottling up of when gear rotates to two annular flow groove closing positions, occurring, so improved the stationarity that turns round greatly at the fluid of between cog.Detect through experiment, but the instantaneous pressure 20MPa of pump, noise is less than 65db(A), pulsation is less than 2%, and total efficiency reaches more than 80%, the domestic internal gearing oil pump that does not still have similar performance.

Claims

1, a kind of interior engagement hypocycloid oil pump, it is made up of a pair of internal gear pair, protecgulum, bonnet, eccentric bushing, pump shaft etc., internal gear is driven by pump shaft, the external rotor that drive is installed in the eccentric bushing rotates in the same way, respectively have two annular flow grooves on the forward and backward lid end face, it is characterized in that the flow groove is arranged on respect on the asymmetric position of inner and outer rotors axis, i.e. the setting of two circular grooves is angles of relative inner and outer rotors axis tilt; And in the middle of two flow grooves, have a finedraw drain pan.

2, according to the said interior engagement hypocycloid oil pump of claim 1, it is characterized in that internal rotor is one to have the disk of arc groove on circumference, roller is packed in the close-fitting arc groove of internal rotor, forms with the inner cycloidal gear of inner cycloidal gear outer rotor teeth portion engagement and pays.

3, according to claim 1 or 2 said interior engagement hypocycloid oil pumps, it is characterized in that the fluid that the finedraw drain pan releases, through oilhole 19, drain pan 24, lubrication groove 20,5 and spill port 14 enter oil sump.