CN102345554A

CN102345554A - Star-like cylinder hydraulic hydraulic motor

Info

Publication number: CN102345554A
Application number: CN2011101925701A
Authority: CN
Inventors: V·佩科拉利; D·佩科拉利
Original assignee: I APPARECCHIATURE IDRA Soc
Current assignee: I APPARECCHIATURE IDRA Soc
Priority date: 2006-04-20
Filing date: 2006-04-20
Publication date: 2012-02-08
Anticipated expiration: 2026-04-20
Also published as: CN102345554B

Abstract

The invention discloses a star-like cylinder hydraulic motor. The star-like cylinder hydraulic motor comprises a swinging hydraulic cylinder (1), wherein the swinging hydraulic cylinder (1) can drive swinging with the aid of an eccentric crank pin (2) formed on a motor shaft (3); a lining (4) of the swinging hydraulic cylinder (1) is provided with trunnions (5) for swinging around a rotation axis (A) and a parallel axis (c) and the rotation axis (A) and the parallel axis (c) are parallel to the motor shaft (3); and the trunnions (5) and a motor crank case (6) have a swinging connection. The star-like cylinder hydraulic motor also comprises a piston (7), wherein the piston (7) can carry out reciprocating motion in the lining (4); and the piston (7) is provided with a rotor (3) for sliding on an outer surface (9) of the eccentric crank pin (2). The star-like cylinder hydraulic motor also comprises a disc-type distributor (10, 23), wherein the disc-type distributor (10, 23) is connected to the motor shaft (3) and rotates synchronously with the motor shaft (3); the disc-type distributor (10, 23) is suitable for realizing the fluid communication between enabling hydraulic circuit pipes (12, 13) and a corresponding cylinder pipe (14) by inclined or break-through openings in conveying and discharge strokes; advantageously, a rotating disk of the disc-type distributor (10, 23) is provided with a connection/supply device (38, 40) which leads to a passageway which is located between a surface (27) and an inner wall of a disc-type distributor cover (41) and contains a sealing member (28); and an area outside the sealing member (28) contains pressurized fluid. In another embodiment, the trunnions (5) of the star-like cylinder hydraulic motor are provided with groove-like channels (30) formed on areas where outer surfaces (31) of the trunnions (5) frictionally contact with trunnion necks, and are provided with branch arrangements (30) with a substantially trapezoidal projection shaped; and pressurized fluid is supplied to the groove-like channels (30) in the branch arrangements (30) from the interior of the swinging hydraulic cylinder (1) by one or more supply channels (32).

Description

Radial cylinder hydraulic

The application is that to be called " radial cylinder hydraulic ", the applying date be that October 20, application number in 2008 are 200680054269.1, international filing date is that April 20, international application no in 2006 are dividing an application of PCT/IT2006/000268 to name.

Technical field

The present invention relates to be suitable for radial cylinder hydraulic motor, particularly have the radial cylinder hydraulic motor of the tilting cylinder block of the low cruise characteristic that compensates radial cylinder hydraulic motor with high speed capability with high rotation speed operation.

Background technique

At such oil hydraulic motor known in the art, wherein the cylinder body of radial arrangement acts on the public crank pin or eccentric wheel that are positioned at the center, and tilting cylinder block is set with driven plunger rotor (runner) slidably on crank pin or eccentric wheel.

Traditional motor comprises having the cylinder body that flattens suitably or the distributor of disc shaped; This distributor is formed with a plurality of reach through holes that are communicated with first branch of oil hydraulic circuit; This first branch rides on second relative first, and by each feeding/discharge conduit setting of corresponding cylinder body; This distributor is formed with the slope hole that is communicated with second branch of oil hydraulic circuit, and this second branch rides on plate-like distributor and said second relative periphery cylinder surface.Intercommunicating pore of that group break-through be grouped in said second in the radially opposite different zone of that group slope hole in.

People recognize; When rotating speed increases to when being higher than per minute 500-600 and changeing; Hydraulic fluid can cause thermal loss, vibration and cavitation through flowing back and forth of distributor and each pipeline, and such motor that has a radial cylinder usually can this thing happens.And, under high rotating speed, be arranged on Sealing on first can influence the path that flows between this face and the sealing cover do not interrupt flow, thereby can't under all operating modes, keep the tightness of Sealing.

In the prior art; Can recognize from document WO 99/17021; Radial cylinder hydraulic motor comprises: oscillating motor; Said oscillating motor drives swing by means of the eccentric crank pin that is formed on the motor drive shaft, and the lining of tilting cylinder block is provided with the gudgeon that is used for around the swing that parallels to the axis of the rotation axis that is parallel to said motor drive shaft, and said gudgeon is attached to the motor crank box swingably; Pistons reciprocating in said lining, said piston are provided with and are used for the rotor that on the outer surface of said eccentric crank pin, slides; And the rotation plate type distributor, said distributor is attached to said motor drive shaft to rotate synchronously with it, is suitable in conveying and discharge stroke, via the port that tilts or break-through is constructed the pipeline of oil hydraulic circuit being communicated with the pipeline fluid of corresponding cylinder body.

The existing technology document has been put down in writing radial cylinder hydraulic motor and has been had the mechanical device that changes the crank pin stroke.

In this type oil hydraulic motor; The swing gudgeon of cylinder body lining is easy between gudgeon and its axle journal, lack lubricated; Especially the limited cylinder body of pendulum angle, as have the situation of little displacement motor of large-sized relatively cylinder body, it also is like this also having the variable-displacement motor.In fact; In having the limited motor of large-size cylinders and hunting range, this motor has the variable displacement characteristic that the working stroke when reducing it and reduce discharge capacity realizes, such motor forms uneven lubricating at their the surface of contact place of axle journal and gudgeon usually; This finally possibly cause damaged surfaces; If swing is carried out fast, promptly work as motor with very high rpm operation, then especially like this.

Verified; The high rotating speed of proposed projects that is intended to the existing technology through overcoming the problems referred to above from the direct supplied with pressurised fluid of cylinder body down and unsatisfactory; Under high speed conditions; Since minimum injection rate setting (being the minimum wobble scope) and high-output power (big reaction force), any crucial and insecure relatively factor of becoming of lubricating of the employing of can making over.

Moreover; Be intended to reduce the proposed projects of existing technology of the existence of idle gap and hydraulic piston be arranged to the structure of hollow and be formed with relate to the pull that cooperates or push dome, make reciprocating quality less with sizable cost sacrifice by this with the pull soma.But, in most of the cases, piston is that the hollow cylindrical pipeline section by open-top constitutes, and such pipeline section is retracted on the monoblock body, and this monoblock body is formed with usually and leads to the lubrication hole that rides rotor below on crank pin/eccentric wheel outer surface.

Under existing technical merit, there is not simple and economy to make the method for lightweight hollow easily.

In a word; The restriction of existing technology level can't design a kind of like this radial cylinder hydraulic motor; It can surpass in cost economy and is set to the radial cylinder rotating speed that per minute 600 changes as usual, and sees from the angle of machinery and volumetric efficiency and still to show satisfactoryly.

Therefore; Technical problem to be solved by this invention provides a kind of radial cylinder hydraulic motor; This oil hydraulic motor has and is suitable for the hunting range work that reduces and/or is in slidable contact with each other and the mechanical parts, particularly cylinder body gudgeon that can rotate down in very high rpm (promptly minimum cylinder body swing) by this.

Moreover; The purpose of no less important of the present invention provides the oil hydraulic motor of the to-and-fro motion part (being piston) that has quality and alleviate; And reducing the idle volume of residue in the motor in the operation process, little idle volume is the principal element that the mode with cost economy runs up.

Summary of the invention

The invention solves above-mentioned technical problem; The present invention provides a kind of radial cylinder motor; It comprises: oscillating motor; This oscillating motor drives swing by means of the eccentric crank pin that is formed on the motor drive shaft, and the lining of tilting cylinder block is provided with the gudgeon that is used for around the swing that parallels to the axis of the rotation axis that is parallel to motor drive shaft, and these gudgeons are attached to the motor crank box swingably; Pistons reciprocating in said lining, these pistons are provided with and are used for the rotor that on the outer surface of said eccentric crank pin, slides; And the rotation plate type distributor, this distributor is attached to motor drive shaft to rotate synchronously with it, is suitable in conveying and discharge stroke, via the port that tilts or break-through is constructed the pipeline of oil hydraulic circuit being communicated with the pipeline fluid of corresponding cylinder body; Be characterized in; The location that gudgeon contacts with their journal friction on their outer surface is formed with groove shape passage; Form by this and have the roughly branched bottom layout of trapezoidal projection shape, the passage supplied with pressurised fluid of giving these branches from one or more service ducts of cylinder interior.

In another embodiment, the said groove shape passage on the master of trapezoidal shape roughly is attached to the zone of lining near the cylinder body gudgeon; In addition, at least one blind vias in the branched layout is from forming the centre that the passage of the said master of trapezoidal shape roughly extends to branched layout.

In an improved embodiment, piston advantageously is made up of pipe, and this pipe is fixed in piston base and has attached said rotor on it; The head of mushroom-like stopper is an interference fit in away from the distant place pipe parts of base portion inner; The bar portion of mushroom-like stopper is an interference fit in the base portion, and is formed with coaxial flow-in hole, and this flow-in hole is used for being used for through the pressure fluid of the lubricated rotor in hole of base portion.

From the description of the preferred embodiment of the present invention that with reference to the accompanying drawings mode with non-limitative example provided, the feature and advantage of the structure of the relevant radial cylinder liquid of the present invention motor can become clear.

Description of drawings

Fig. 1 is the sectional view of the oil hydraulic motor (promptly comprising component part described below) of embodiment of the present invention.

Fig. 2 is the amplification view of area I I among Fig. 1, and the improvement structure of each piston is shown.

Fig. 3 is the schematic perspective view according to the tilting cylinder block lining among the improvement embodiment of gudgeon of the present invention.

Embodiment

Radial cylinder hydraulic motor shown in Fig. 1 comprises: oscillating motor 1; These oscillating motors drive swing by means of the eccentric crank pin 2 of motor drive shaft 3, and the lining 4 of oscillating motor is provided with the gudgeon 5 that is used for around the axis C swing parallel with the rotation axis A of the motor drive shaft that is installed in motor crank box 6; Piston 7 to-and-fro motion and being provided with in said lining is used for the rotor 8 that on the outer surface 9 of said eccentric crank pin 2, slides; Motor comprises rotary type distributor 10, and this distributor is connected into motor drive shaft 3 through drive pin 11 and rotates synchronously, and is suitable in the process of conveying and discharge stroke, the

pipeline

12 and 13 of oil hydraulic circuit being communicated with pipeline 14 fluids of corresponding cylinder body.

Piston 7 is formed with lubrication hole 15 usually with the zone between the outer surface 9 of lubricated rotor 8 and crank pin 2; In addition, piston comprises pipe 16, and this pipe is attached to the base portion of said rotor 8 common institute piston fixed 17; Head 19 formation of mushroom-like stopper 20 and pipe are away from the interference fit of the internal diameter of the distant place part 18 of base portion 17; The bar portion 21 of mushroom-like stopper is an interference fit in the base portion 17; And being formed with coaxial flow-in hole 22, this flow-in hole 22 is used for guiding to lubricate the pressure fluid of rotor 8 through the hole 15 of base portion 17.

Rotary type distributor 10 comprises rotary type plate distributor 23, and is formed with the influent stream port that leads to corresponding tilting cylinder block 1 in suitable timing usually.This dish has the port 24 that is used for hydraulic fluid pipeline 13 is communicated to second 25 oblique structure; This dish also has at the port 26 in abutting connection with the structure of the break-through between first 27 and second of hydraulic fluid pipeline 12, and port 26 is arranged on the remote areas away from the port 24 of oblique structure.Be provided with traditional Sealing 28 for first 27; Sealing part 28 comprises metal outer shroud, anti-extrusion rings and is received in the circular arc interface ring in the annular seating 29, is used for being isolated in from the path between the port 26 of the said break-through structure of the fluid flow path of the compartment of pipeline 12 to dispenser cap 41.

Fig. 1 is the partial view of the branched layout 30 in the bearing surface 31 of gudgeon 5 of lining 4 of oil hydraulic cylinder 1.Give the hydraulic fluid of this branched layout supplied with pressurized through the hole in the cylinder body 32.

Branched layout 30 in the surface 31 that is formed by little hydraulic fluid distribution channel is shown in Fig. 4 usually best; The structure that has the projection of shape of approximate trapezoid shown in this figure has the passage 33 that limits near the joint of gudgeon 5, the master that promptly extends near lining 4, and has by the fixed passage 34 of inferior lateral confinement near 35 extensions of gudgeon end; In addition, said each side is through connecting along the passage of inclined side 36, and is communicated in master towards the blind vias 37 at the center of the branched layout of trapezoidal projection shape.

Although the assembly of above-mentioned piston 7 is to realize through the conventional piston of oil hydraulic motor is simply revised; But it is easy to carry out; Because it has only carried out small modification to the technology of machining pipe 16 and base portion 17, so that they admit the head 19 and bar portion 21 of mushroom-like stopper 20 with interference fit.The piston of gained is a hollow structure, and is therefore light and make idle gap minimum than solid piston mass.The to-and-fro motion meeting of the piston of structure as described above improves the performance of motor speed aspect, and can high rotating speed operation.

The distribution of the hydraulic fluid that branched layout 30 is guaranteed to pressurize in the upper support zone 31 of gudgeon 5 is near the distribution of contact pressure on the gudgeon axle journal on said surface.The structure of the small channel that is provided realizes that the fluid that matees with the resistance to flexure of gudgeon 5 distributes; Gudgeon is almost crooked with the mode identical with support in the high pressure working procedure; And applying compression load to axle journal, this compression load concentrates on the location that is attached to swing lining 4.For this purpose, the structure of branched layout 30 has most of fluid of being arranged to tap hole 32 and concentrates on this regional master 33 and blind vias 37.In any case, in the inferior side 34 of the branched layout of trapezoidal projection shape, fluid feed hole 32 is set also.

Certainly, those of ordinary skill in the art can carry out various modifications to satisfy various possible requirements to above-mentioned radial cylinder hydraulic motor, and these modifications are included within all scopes of the present invention that proposed in the following claim.

Claims

1. radial cylinder hydraulic motor; Comprise: oscillating motor (1); Said oscillating motor drives swing by means of the eccentric crank pin (2) that is formed on the motor drive shaft (3); The lining of tilting cylinder block (4) is provided with the gudgeon (5) that is used for around (C) swing that parallels to the axis of the rotation axis (A) that is parallel to said motor drive shaft, and said gudgeon is attached to motor crank box (6) swingably; Pistons reciprocating in said lining (7), said piston are provided with the outer surface (9) that is used at said eccentric crank pin and go up the rotor (8) that slides; And rotation plate type distributor (10); Said distributor is attached to said motor drive shaft to rotate synchronously with it, is suitable in conveying and discharge stroke, via the port that tilts or break-through is constructed the pipeline (12,13) of oil hydraulic circuit being communicated with pipeline (14) fluid of corresponding cylinder body; It is characterized in that; The location that said gudgeon (5) is gone up gudgeon journal friction contact at their outer surface (31) is formed with groove shape passage (30); And form and have the roughly branched layout of trapezoidal projection shape (30), give the said passage supplied with pressurised fluid the said branched layout through one or more service ducts (32) from said cylinder interior.

2. radial cylinder hydraulic motor as claimed in claim 1 is characterized in that, the said groove shape passage on the long side of said roughly trapezoidal shape is attached to the zone of said lining near said cylinder body gudgeon.

3. radial cylinder hydraulic motor as claimed in claim 2 is characterized in that, at least one blind vias in the said branched layout extends to the centre of said branched layout from the passage of the said long side that forms said roughly trapezoidal shape.

4. radial cylinder hydraulic motor as claimed in claim 1 is characterized in that, said piston is made up of pipe (16), and said pipe is fixed in piston base and has attached said rotor (8) on it; The head (19) of mushroom-like stopper (20) is an interference fit in distant place pipe parts (18) inside away from base portion (17); And the bar portion (21) of said mushroom-like stopper is an interference fit in the said base portion (17), and is formed with coaxial flow-in hole (22), and said flow-in hole is used for lubricating the pressure fluid of said rotor (8) through the said hole (15) of said base portion (17).