CN1006081B

CN1006081B - Variable hydraulic machinery and hydraulic transmission of stepless variable drive

Info

Publication number: CN1006081B
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: 1989-12-13
Also published as: CN85109105A

Abstract

The present invention relates to a hydraulic machine with radial variable discharge capacity, and a hydraulic driving device with stepless speed change, wherein the hydraulic driving device is composed of the hydraulic machine. A cam ring of the present invention is in a combined type, and two half cam rings can symmetrically move relatively to the center of a rotor so as to change the travel of a plunger piston or a blade; therefore, the discharge capacity can be changed. Compared with the existing double-discharge plunger piston with staggered phase positions, the structure of the present invention is simple. Moreover, the travel and theischarge capacity of the piston are changed simultaneously. The efficiency performance of load change is favorable. Moreover, the abrasion between the plunger piston and a cylinder wall is reduced.

Description

The stroking mechanism of hydraulic radial variable displacement pump or motor

The invention belongs to hydraulic machinery and hydraulic transmission.

General multiaction cam hydraulic machinery has lot of advantages, but because cam ring is an integral body, and stroke can not change, change relatively difficulty of discharge capacity.A kind of way is the oil hydraulic cylinder flow window cam ring phase shifting method corresponding with two that adopts two rows to communicate separately.For example U. S. Patent 3,895, and 565 is described, the variable of pump or motor turns an angle by two cam ring inversion symmetry, and the plunger motion phase place that then communicates between two oil hydraulic cylinders changes, cause a part of liquid to flow communicating between two cylinders, external discharge capacity also just changes.The shortcoming of this structure, the one, component 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.

Thereby the object of the present invention is to provide a kind of stroke that can make cam ring to change and to make the mechanism of oil hydraulic pump or motor variable.

The object of the present invention is achieved like this: the cam ring system is made up of two cam semi-rings, and the curve of cam semi-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 arc section that curved section reaches and curved section is tangent.Two cam semi-rings can be symmetrical in the displacement of rotor center in housing, the mode of displacement, symmetrical straight line motion can made between the lower rail on the housing, also can make semi-ring one end do symmetrical circular motion around a bearing pin on the housing, when semi-ring moves, the position of cam curve changes to rotor center, so just changes the plunger stroke in the oil hydraulic cylinder on the rotor, therefore changes 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 two ends circular arc portion overlap mutually, at moving linearly or when doing circular motion, the track of overlap is all the time on two straight lines or on two sections circular 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.

Implementation example and description of drawings:

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 formed by one section curve (being generally circular arc) and with one section tangent tangent section of curve, 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 force transferring levers that 3. support go up and 8. move up and down, the other end of lever 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, and Fig. 3 is the stereogram of arc section overlap joint.The curve of two semi-rings is made up of two sections arc sections that curved section (being generally semicircle) reaches and the curved section two ends are tangent, and 1. two semi-rings can do circular 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 arc section at center with the bearing pin center, when semi-ring moves, curve overlap up and down is always circular arc, guarantees the continuously level and smooth of entire curve.

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

Claims

1, the stroking mechanism of a kind of hydraulic radial variable displacement pump or motor is made up of cam ring and operating mechanism, it is characterized in that: cam ring is made up of two cam semi-rings, and two cam semi-rings can be symmetrical in the displacement of rotor center in housing.

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