CN2447550Y - Roller mechanism of plunger hydraulic machinery - Google Patents

Abstract

The utility model relates to a radial rolling wheel mechanism of a plunger type hydraulic machine. The utility model is composed of two rolling wheels arranged at both sides of the top part of a plunger and a supporting shaft. The diameter of the rolling wheel is a plurality of times longer than the diameter of the supporting shaft. Therefore, the contact stress between the rolling wheel and a rolling path can be reduced, the sliding line speed between the rolling wheel and a support bearing is reduced by a plurality of times, and the friction loss is reduced, which leads the hydraulic machine to work under high speed and high pressure conditions.

Description

A kind of roller mechanism of plunger-type hydraulic machine

The utility model belongs to a kind of mechanical component that can make operation under the radial plunger type hydraulic machinery high speed and high pressure.

Radially many curves plunger-type hydraulic machine (pump and motor) is compared with axial plunger type hydraulic machinery, can have more than once plunger stroke to improve advantages such as revolution discharge capacity and stressed comparatively symmetrical balance, flow pulsation is less thereby have revolution.But radially during many curves plunger-type hydraulic machine, often be subjected to the restriction of Several Factors in design; The one, contact stress between roller and the curve ring and the bearing capacity of roller itself (finger) if use rolling bearing.The one, the mechanical friction between roller and the block bearing.Therefore many curves plunger type form radially at present only limits to be adopted by the low-medium speed oil hydraulic motor, and the radially many curves ram type pump and the motor of high speed and high pressure are then rare.

The purpose of this utility model is to provide a kind of roller mechanism that can move for inner curve plunger-type hydraulic machine radially under high speed and high pressure.

The purpose of this utility model is to realize like this.As shown in drawings, roller structure is I-shaped, and the both sides is a roller, and the centre is a supporting axle.Roller diameter is equal to or greater than 2-3 times of supporting axle diameter at least.Supporting axle rotates in the bearing of plunger head.In order to reduce friction, bearing can adopt the static pressure principle, leads to aperture in the oil hydraulic cylinder by the plunger center, make have in the pit of bearing bottom with oil hydraulic cylinder in identical pressure.

Because roller structure is an entity, the problem that allows bearing capacity is arranged unlike rolling bearing.Hydraulic coupling that plunger is suffered and centrifugal force are on average shared by the roller of both sides, so each roller is only born 1/2 of total power.The diameter and the width that add upper roller, increase is not restricted.According to simple Calculation of Contact Stress method $\mathrm{\&sigma;}=a\sqrt{\frac{N}{\mathrm{B\&rho;}}},\frac{1}{\mathrm{\&rho;}}=\frac{2}{D_1}\&PlusMinus;\frac{2}{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="Y9925241700051.png,Y9925241700054.png"\; state="\{\{state\}\}">D</figure-callout>}2}$ Wherein a is that N is the total power that is subjected on the surface of contact by the fixed number of decisions such as material and heat treatment hardness, and B is the width of roller, and ρ is an equivalent diameter, D ₂Be roller diameter, D ₂Curvature diameter for curve articulating synapsis.Under other conditions are identical, reduce N, increase B value and D1 value, the σ value promptly reduces.Also being stressedly both to be shared by two rollers, can increasing the diameter and the width of roller again, also is that contact stress can be controlled within the allowed band on request.

Bearing is directly proportional with the linear velocity of friction with the frictional loss of supporting axle.Because roller diameter is the several times of supporting axle diameter, so the linear velocity of friction in the bearing compares with the linear velocity that roller rolls on the curve ring, presses the reduction of roller and supporting axle diameter ratio, so the reduction that mechanical loss also just can be at double.

Because reduction contact stress and two problems of reduction pivot friction all obtain being situated between and determine, radially many curves plunger-type hydraulic machine of high speed and high pressure just becomes possibility.The claimant once utilized described structure, had made 32 megapoises, radially many curves plunger pump of 1470 rev/mins, and simple in structure, easy to manufacture, performances such as cost is lower, pulsation, vibration all are better than axial piston pump.

Embodiment of the present utility model, as shown in drawings: accompanying drawing one is a sectional arrangement drawing, accompanying drawing two be drawing in side sectional elevation wherein 1 for roller, diameter is D, 2 is supporting axle, diameter is d, and D is greater than d, and 3 is bearing, 4 is plunger, 5 for passing to the aperture of oil hydraulic cylinder from bearing, 6 is the raceway of curve ring, and 7 is the oil hydraulic cylinder on the rotor body.

When rotor rotation, pressure in the oil hydraulic cylinder 7 passes to bearing 3 through the aperture 5 in the plunger 4, pressure on the plunger 4 and centrifugal force are divided into two halves is pressed on the raceway 6 roller 1, and the contact stress that produces between roller and raceway can be controlled by the diameter and the width of roller 1.In roller when rotation,, the relative linear velocity between supporting axle 2 and the bearing 3 only is roller rolling wire speed on raceway

Embodiment also has another kind of form.Shown in accompanying drawing three and four, accompanying drawing three is a sectional arrangement drawing, and accompanying drawing four is a drawing in side sectional elevation.Wherein 1 is two rollers, and diameter is D.2 is plunger, and respectively there are two supporting axles 3 the plunger head both sides, and diameter is d, and D is greater than d.Plunger pressure and centrifugal force are divided equally two halves equally, roller is pressed in produces contact stress on the raceway.Porose in the middle of 1 as outer bearing, be enclosed within rotation on the supporting axle 3, have pit and aperture to pass to oil hydraulic cylinder through the aperture in the plunger on 3 on the two-side supporting axle, make and produce static pressure and lubricated between little axle and roller, then bearing axis speed also only is roller in raceway rolling wire speed

By above two kinds of structures, contact stress and pivot friction all can reduce at double, therefore can make radially many curves hydraulic machinery high speed, high-voltage operation.

Claims (3)

1. the roller mechanism of a plunger-type hydraulic machine, the roller, supporting axle and bearing four parts that comprise plunger, both sides, it is characterized in that bearing provides hydraulic support by the aperture at straight-through oil hydraulic cylinder inner plunger center, roller diameter is equal to or greater than 2-3 times of supporting axle diameter at least.

2. roller mechanism according to claim 1 is characterized in that both sides roller and supporting axle are one whole, and supporting axle rotates in the bearing of plunger head.

3. roller mechanism according to claim 1, the roller housing that it is characterized in that the both sides is on two supporting axles of plunger both sides, and the roller endoporus rotates on supporting axle as outer bearing.

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