CN85109105A

CN85109105A - Variable hydraulic machinery and stepless speed changing hydraulic transmission device

Info

Publication number: CN85109105A
Application number: CN85109105.9A
Authority: CN
Inventors: 赵硕颀
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-10-08
Filing date: 1985-10-08
Publication date: 1987-04-15
Also published as: CN1006081B

Abstract

A kind of radially variable displacement hydraulic machine tool and a kind of stepless speed changing hydraulic transmission device of forming by above-mentioned hydraulic machinery, its cam ring system combined type, two cam semi-rings can be done to move with respect to the symmetry of rotor center, to change the stroke of plunger or blade, therefore change discharge capacity.Structure of the present invention is simple in structure than existing double plunger phase shifting, and piston stroke and discharge capacity change simultaneously, and the efficient better performances of varying duty has also reduced the wearing and tearing of plunger and casing wall.

Description

Variable hydraulic machinery and stepless speed changing hydraulic transmission device

The invention belongs to hydraulic machinery (referring to pump and motor, down together) and hydraulic transmission.

General multiaction hydraulic machinery has lot of advantages, but will change relatively difficulty of its discharge capacity.A kind of way is the oil hydraulic cylinder dispensing window cam ring phase shifting method corresponding with two that adopts two rows to communicate separately.For example U. S. Patent 3,895,565 is described, the variable of pump or motor, turn an angle by two cam ring inversion symmetry, the plunger motion phase place that then communicates between two oil hydraulic cylinders changes, and causes a part of liquid to flow back and forth between two cylinders communicating, external output or input discharge capacity also just change, and reach the purpose of variable with this.The shortcoming of this structure, the one, parts in addition such as double oil cylinder, plunger, roller must be arranged, increase manufacture cost; The 2nd, the stroke of plunger is constant when changing discharge capacity, so mechanical loss is because of displacement variation changes, and mechanical efficiency is lower when the float amount.

The present invention adopts the variable element of knockdown cam ring as hydraulic machinery, lifting radially two effect pillar pumps or motor is example, the cam ring system is made up of two cam semi-rings, the curve of cam ring can be made up of the tangent section that curved section reaches and curved section is tangent, also can be made up of the garden segmental arc that curved section reaches and curved section is tangent.Two cam semi-rings can be done the displacement with respect to rotor center in housing, mobile mode can made symmetrical straight line motion between the lower rail on the housing, also can make semi-ring one end do the arc motion of symmetrical garden around a bearing pin on the housing.When semi-ring moved, the relative rotor center in the position of cam curve changed, and so just changed the plunger stroke in the oil hydraulic cylinder on the rotor, therefore changed the discharge capacity of oil hydraulic pump or motor.In order when moving two semi-rings, to keep the continuity of cam curve, the straight section of semi-ring curve or garden, two ends arc part be overlap joint mutually, at moving linearly or when doing the motion of garden arc, the track of overlap is all the time on two straight lines or on two sections garden arcs, this just guarantees that cam curve is the curve of a continuously smooth all the time.Seam can design the low pressure area at curve, to reduce roller in the contingent influence of beating of seam crossing.

Structure of the present invention is simple in structure than existing double plunger phase shifting, and piston stroke and discharge capacity change simultaneously, and the efficient better performances of varying duty also reduces the wearing and tearing of plunger and casing wall.

Description of drawings and implementation example

Fig. 1 is the sectional drawing of an oil hydraulic pump.6. oil hydraulic pump has two cam semi-rings, the cam curve of semi-ring is made up of the tangent section that one section curve (being generally the garden arc) reaches and curved section one end is tangent, the two halves tangent section is formed parallel framework up and down, can 2. slide between closed slide up and down at housing, 4. adjusting handle is a nut, when stud bolt rotates on 5., make and be contained in two power transmission Bars bars arm 8. that 3. support go up and move up and down, another arm of Bars bar is pressed in thrust pin and 1. goes up, 6. two cam semi-rings are moved in or out, promptly change stroke, change discharge capacity, the structural principle of motor is identical with pump, and just effect is opposite.

Fig. 2 is the schematic representation of another kind of combined type cam ring, and the curve of two semi-rings is made up of curved section (being generally half garden) and two sections tangent garden segmental arcs of curve one end thereof.1. two semi-rings can do garden arc motion around bearing pin.1. bearing pin is fixed on the housing, two semi-rings end 3. has pin-and-hole, be enclosed within on the bearing pin, 2. the other end of semi-ring respectively is provided with an earrings, two earrings can move as inversion symmetry by the various kinds of drive, and its overlap is for being the garden segmental arc at center with pin center, garden, when semi-ring moves, curve overlap up and down is always the garden arc, guarantees the continuously level and smooth of entire curve.

Shown in the accompanying drawing, it only is a kind of for example embodiment of the present invention. The present invention not only can be used for plunger-type hydraulic machine, also can be applicable to other patterns, such as vane pump or sliding-vane motor. The mode of mobile semi-ring can adopt various ways, such as gear drive, and worm and gear, screw thread transmission fluid cylinder pressure is handled etc. Power can be manual, electronic or pneumatic, all forms such as surge.

Claims

1, a kind of stroking mechanism that is used for hydraulic radial variable displacement pump or motor is made up of cam ring and operating mechanism.It is characterized in that: cam ring is a combined type, between the assemblying body relatively rotor center do displacement.

2, a kind of by the said stroking mechanism of claim 1, it is characterized in that: the curve on the combined type cam ring is made up of the tangent section that curved section reaches and curved section is tangent.

3, a kind of by the said stroking mechanism of claim 1, it is characterized in that: the curve on the combined type cam ring is made up of the garden segmental arc that curved section reaches and curved section is tangent.