CN103210210A

CN103210210A - Hydraulic device

Info

Publication number: CN103210210A
Application number: CN2011800547450A
Authority: CN
Inventors: 斯特凡娜·维达尔
Original assignee: Poclain Hydraulics Industrie
Current assignee: Poclain Hydraulics Industrie
Priority date: 2010-09-17
Filing date: 2011-09-15
Publication date: 2013-07-17
Anticipated expiration: 2031-09-15
Also published as: CN103210210B; DE112011103103T5; FR2965020A1; WO2012035270A1; US20140007766A1; FR2965020B1

Abstract

Hydraulic device such as a motor or a pump comprising a first set of parts (1C), including a casing portion, and a second set of parts (1D) fixed to said first set. Said sets have a first and a second contact face (1C',1D'), respectively, which are pressed one towards the other and placed in mutual contact by means (15) exerting an axial stress. At least one of the first and second contact faces has a rough friction surface. By virtue of said surface, a high torque can be transmitted between the two sets. The invention also relates to a method for producing such a hydraulic device.

Description

Hydraulic pressure installation

Technical field

The present invention relates to a kind of hydraulic pressure installation (for example motor or pump), this device comprises: first element, and it comprises housing parts, cylinder body is arranged in this housing parts; And second element, be fixed to described first assembly, described first and second elements have first surface of contact and second surface of contact respectively, and these two surface of contact are pushed toward each other by the device that applies axial pressure and settled with being in contact with one another.

Background technique

Here, the device that applies axial pressure is the device of exerting pressure along perpendicular to the axis of these faces, and this pressure tends to two surface of contact are pushed toward each other.

In oil hydraulic motor or pump, housing generally includes a plurality of parts, and these parts are machined individually and are mounted to together.This class component is necessary can transfer of torque.For example, the housing of oil hydraulic motor has: cam part, be in week in it wavy with the piston compounding practice of cylinder body; And be called as the parts that distribute lid, and it is around inner dispenser arrangement, and this distributor distributes a fluid to a plurality of cylinders of cylinder body.These two parts must be fixed to together, in order to tightened together best.

Under the situation that housing is fixed, usually distribute cover to be fixed to the fixing parts on the chassis and so on of vehicle for example, and because cylinder body determines the running of this motor with respect to the rotation of cam, cam part must be fixed to this cover best and can not rotate.In the case, be the moment of torsion of opposing motor torsional moment distributing the moment of torsion that transmits between lid and the cam part.

And some oil hydraulic motors are provided with braking system, and these braking system are arranged in the housing parts that is called brake cover.These parts are fixed to another housing parts, for example be fixed to distribute lid, and these parts must be connected on it best to transmit braking torque.

So especially, may cause the very big vibrations that are accompanied by of braking, rather than balanced braking.During this vibrations, very big moment of torsion must be delivered to another parts from parts of motor.Therefore, in being equiped with the motor of braking device, the fastening quality between the different parts of motor is even more important.

Have at motor under the situation of rotary shell, motor torsional moment or braking torque are also inevitable to be transmitted between the different housings parts that are assembled together.

Like this, in the multiple device such as oil hydraulic motor or pump, between first assembly that a plurality of parts constitute and second assembly (each assembly can only comprise single parts), must transmit very big moment of torsion.This moment of torsion mainly transmits via the housing parts of the parts that form first assembly and second assembly respectively usually.

At first, in order to assemble two assemblies of oil hydraulic motor, be typically provided with surface of contact at each assembly.The device (for example, screw) that applies perpendicular to the axial pressure of surface of contact is pushed toward each other two surface of contact, and two assemblies are settled with being in contact with one another.

And, usually by the rotation that stops for two assemblies are fastened on the device (being generally screw) of fixing rotational position with respect to other rotations of two assemblies.

In such motor, the transmission of moment of torsion is to take place like this:

At first, except it locks rotatably and applies the effect of axial pressure, screw serves as cutting element, that is these screws transmit a part of moment of torsion between two assemblies.And, except screw, when the moment of torsion that is transmitted is very considerable, if necessary, also can use as other cutting element such as ball, pins.

Yet in the time must transmitting sizable moment of torsion between these assemblies, the quantity of employed screw and/or other cutting element and diameter must be very big.So especially, caused the bulky and complicated problems of assembly in the application of specific quantity.

For avoiding to use too many or cross large diameter screw or other cutting element, be well known that surface of contact is glued together each other.Yet this method is to be difficult for carrying out in industry, and makes the assemble/disassemble operation become highly difficult.

Summary of the invention

First purpose of the present invention is the shortcoming that exists when overcoming the above-mentioned device that proposes type in using foreword, and the present invention includes improved securing means, be used between two parts of hydraulic pressure installation, transmitting very big moment of torsion, and need not to increase screw or the cutting element that connects these two parts.These devices especially can keep the sealing relevant with the seepage of hydraulic fluid in the composition plane place between these two assemblies of parts.

The realization of this purpose is because the following fact: in this device, described first surface of contact and second surface of contact one of at least have coarse friction surface, so it can allow to carry out between two assemblies high moment of torsion transmission.

As seen, owing to be arranged on this coarse friction surface on the surface of contact, surface of contact can transmit very big moment of torsion really between two assemblies, (this moment of torsion) in addition may be than known embodiment before much bigger.In this way, in the device according to the present invention, reduced or even eliminated the user demand of the cutting element of the transmission that is used for moment of torsion.

The present invention understands the assembling of surface of contact especially in detail, and these two surface of contact all are metals, and this metal can transmit higher pressure.

The present invention especially can implement in the hydraulic pressure installation that comprises rotor and stator, and such hydraulic pressure installation need transmit high moment of torsion usually, and is especially all the more so when this device comprises braking device.

Especially, the present invention can also implement in such device: in this device, second assembly of parts also comprises housing parts, and the device that applies axial pressure is used for two housing parts fixed to one another.

Coarse friction surface can be arranged on all or part of of surface of contact.

In one embodiment, first assembly also comprises mounting plate; First surface of contact is respectively formed on the wall relative with described second assembly with described mounting plate with second surface of contact; And, on the wall relative with described mounting plate with described housing parts, form the 3rd surface of contact and the 4th surface of contact respectively.

Advantageously, this embodiment realizes quite easily.In fact, concrete operation can be only relevant with mounting plate especially for those operations of the coarse friction surface of preparation.

Because mounting plate (usually) is littler and simpler than the miscellaneous part that constitutes first assembly or second assembly (as housing parts), the specific operation on the mounting plate of mentioning before therefore carrying out are still relatively easy.

This mounting plate can utilize the usual way manufacturing: after shot peening (peening) and improving the surface treatment of surface hardness of plate, can make this plate by the tinsel cutting.Therefore, in this case, housing parts and second assembly are all without any need for other specific operation.Yet it may be necessary making them can admit the simple and mechanical processing of mounting plate.

In aforesaid embodiment's (having mounting plate) optional modification, one of them of described the 3rd surface of contact and the 4th surface of contact has coarse friction surface, in order to increase the value of transferable Maximum Torque between housing parts and the mounting plate.These two coarse friction surfaces are arranged on two opposite sides of mounting plate, and implement according to fixing principle rotatably of the present invention in each side of mounting plate.

According to the present invention, friction surface must be coarse, makes this device can transmit high moment of torsion between two assemblies.

For this purpose, in one embodiment, one of them of described friction surface or described friction surface has greater than 12 μ m, is preferably more than the roughness index Ra of 18 μ m, perhaps has coarse parameter Ra and Rz greater than roughness index Rz(standard ISO 4287 restrictions of 80 μ m).In this way, this friction surface has sizable roughness, is suitable for transmitting between two elements very big moment of torsion.

In order to realize this roughness index, the one at least in described friction surface or the described friction surface can be the object for the surface treatment (for example, shot peening) that increases roughness.Such processing (perhaps sand blast) can not only be cleaned the surface of contact of these parts, can also guarantee that the surface of contact of being correlated with has enough roughness.Other processing methods (for example grooving) that are used for the roughness of this surface of contact of increase also are feasible.

Preferably, for the surface treatment that increases roughness be the surface treatment (mean and do not wish employed material is joined friction surface) of no material input.In this way, avoided comprising that the input of the particle of material is handled, because such particle may peel off from friction surface, if they scatter then can damage hydraulic pressure installation in hydraulic pressure installation.

Preferably, friction surface occupies the major component of its set surface of contact that arrives, and for example occupies at least 80% of this surface, in addition should the surface 95% on.

In one embodiment, described or at least one described friction surface has the Vickers hardness (Vickers hardness is to record according to standard EN ISO6507-1) greater than 450Hv.

In fact, when the peak and valley structure that forms on the friction surface (reliefs) penetrates relative surface of contact, can realize king-sized coefficient of attachment at friction surface and towards this between the surperficial surface of contact.Large-scale moment of torsion can be from a component passes to another assembly.In order to realize this target fully, with two assembled together in, when two are faced when pressurizeing towards each other, these peak and valley structures must be maintained at least in part.Therefore, the Vickers hardness of friction surface must be preferably higher.More generally, the present invention also can utilize Vickers hardness greater than 400Hv, perhaps in addition the rubbing surface of 370Hv implement.

In order to realize such Vickers hardness, described friction surface or at least one described friction surface can adopt for the surface treatment that increases surface hardness, and for example nitriding is handled.

In one embodiment, the surface hardness of at least one surface of contact of relatively placing with friction surface is less than the surface hardness of described friction surface.

Preferably, the surface hardness HV of Xiang Guan surface of contact _ContactHV than friction surface on the other side _FrictionLittle by at least 20%, and as if possible to when young 30%.In other words, HV _ContactPreferably less than HV _Friction* 0.8(or even HV _Friction* 0.7).

Because this difference of surface hardness, between the erecting stage of two assemblies, the peak and valley structure that forms at friction surface can relatively easily penetrate into relative surface of contact (latter's surface hardness is less).Consequently the surface of contact that the peak and valley structure of friction surface is real and relative engages, and can transmit very big moment of torsion thus.And, do not need two between the parts pressure or to adhere to frictional force high especially, this moment of torsion just can be transmitted.

Therefore, it should be understood that the present invention is specially adapted to the fixing housing parts of being made by the relatively low metal of hardness (for example, cast iron, cast steel or even forged steel).

And, when using mounting plate, because this mounting plate is and its fixing a plurality of parts parts independently mutually, therefore can relatively freely selects the material of this plate and be applied to the surface treatment of this plate.Can select hard especially material for this plate; The processing that this plate is used still is all to be relatively easy in order to improve its surface hardness in order to make this plate become coarse.By relatively, such processing is applied to whole housing parts usually can be more complicated, and these housing parts comprise the zone of meticulous manufacturing, these zones be relatively fragility and must be retained (not handling).

In a word, the present invention is providing effective solution aspect the moment of torsion transmission, and in industrial aspect (scale), implement especially easily and cost low.

Second purpose of the present invention is to propose a kind ofly for the manufacture of the method at the hydraulic pressure installation of type described in the foreword, and this method can be formed on the connection (link) of the moment of torsion that transmission is very big between these two assemblies between two elements that constitute this device.

The realization of this purpose is owing to comprise the steps: in this method

A) provide first element and second element, for example:

-two assemblies can be fixed to one another, to constitute hydraulic pressure installation, for example motor or pump;

-two assemblies have first surface of contact and second surface of contact respectively;

-the first assembly comprises housing parts, is provided with cylinder body in this housing parts;

B) at the coarse friction surface of one of them formation of described surface of contact, in order between two assemblies, to transmit high moment of torsion; And

D) two assemblies of assembling to settle two surface of contact by the device that applies axial pressure with being in contact with one another.

It should be noted that in the method, the step b) that is used to form coarse friction surface can be in the also i.e. execution imperfect tense of step a) that is used for providing by the different element of this device.

Can be applied to relevant surface of contact by surface treatment a kind of that being used for that preamble is proposed increases roughness and form coarse friction surface.

In order further to improve the effect of this method, in a kind of Implementation Modes, manufacture method also comprises the steps c after step b)): c) carry out surface treatment for increasing the surface hardness of friction surface, make the surface hardness of the surface of contact relatively placed with this friction surface less than the surface hardness of this friction surface.

Description of drawings

To the detailed description as a plurality of embodiments shown in the infinite example, the present invention will be understood easily, and its advantage will more clearly be manifested from following.This description is carried out with reference to following accompanying drawing:

Fig. 1 is the axial sectional view according to oil hydraulic motor of the present invention;

Fig. 2 is among first embodiment, the exploded perspective view of the part of the motor of Fig. 1;

Fig. 3 is similar to Fig. 1 but comprises mounting plate and constitute the three-dimensional exploded view of a part of the motor of the second embodiment of the present invention;

Fig. 3 A is that it shows (section) form of mounting plate partly from the sectional view of the thin portion of Fig. 3 intercepting;

Fig. 4 is the axial sectional view of a part of the motor of Fig. 3;

Fig. 5 is that it illustrates the layout pattern of mounting plate from the sectional view of the thin portion of Fig. 4 intercepting;

Fig. 6 is the fragmentary axial cross-section of decomposition of the part of the motor shown in Fig. 3, and it illustrates the layout pattern of mounting plate;

Fig. 7 is among the 3rd embodiment, with the three-dimensional exploded view of the part of motor like the Motor of Fig. 3, it shows mounting plate;

Fig. 8 is the sectional view of thin portion of the motor of Fig. 7, shows the layout pattern of mounting plate; And

Fig. 9 A and Fig. 9 B be among the 4th and the 5th embodiment, according to the axial, cross-sectional view of the thin portion of motor of the present invention, show other two the possible layout patterns for mounting plate.

Embodiment

In the accompanying drawings, with the different modification of motor 100 a plurality of different embodiment of the present invention has been proposed relatively.In these different modification, identical or similar element keeps using identical reference character.

The oil hydraulic motor 100 of Fig. 1 is the motors with radial piston.The housing of this motor is divided into four parts 1A, 1B, 1C and 1D.Parts 1B has sinuous interior week and forms cam, and the piston of cylinder body 2 and this cam interact.The cylinder body 2 that illustrates in this case comprises the cylinder of two row's biasings, and corresponding cylinder 2 ' is setovered angledly.Piston 2 " be arranged in these cylinders and slip therein.Motor drive shaft 3 non-rotatably is set up with respect to cylinder body 2 by spline, and extends the bearing 4 of this housing bearing motor in the parts 1A of housing.The latter comprises internal fluid distributor 5, and wherein distribution ducts 6 alternately is connected to the conduit pipe 7 of cylinder body 2.Distributor extends in the inboard that is called as the housing parts 1C that distributes lid.Brake axle 8 also extends in the inside of distributor, and it is fixing rotatably with respect to axle 3 and cylinder body 2.Extend in being called as the housing parts 1D of brake cover this end relative with cylinder body 2.This end and this brake member support a plurality of brake members (it is made of the dish 9 that is plugged on each other in the case).The braking contact takes place with promotion dish 9, and can carry out reverse control by pressure fluid in the arrester 12 by spring 11 and pressurized in brake piston 10.

Motor 100 is the types with running shaft, because its housing is fixed, therefore comprises that the housing parts 1A of fastener is not illustrated with the chassis of for example vehicle.

This class motor need carry out large-scale moment of torsion transmission, and this transmission is mainly carried out with two kinds of operator schemes: drive pattern (motoring mode) and braking mode.

In drive pattern, transmit moment of torsion by rotating cylinder body 2 drive axles 3, axle 3 is designed to drive outer member via flange 3 '.For making motor running, housing parts 1B or cam must remain on the fixedly rotational position of the axis A that is preferably the parts 1A that centers on the housing that is fixed to stationary element.Therefore, the moment of torsion of opposing motor torsional moment inevitable at

housing parts

1A and 1B between transmit.

On the contrary, during braking, braking torque must transmit between the parts 1D of housing and

parts

1A, 1B and 1C.

In this way,

different housing parts

1A, 1B, 1C and 1D must be fastened to best together and especially can transmit sizable moment of torsion.

For this purpose, for

parts

1A, 1B and 1C is fixing in rotation, motor 100 at first comprises surface of contact, in order to these parts are attached to

parts

1A, 1B and 1C in couples.These faces are plat surface and perpendicular to the spin axis A of this motor; These faces comprise face 1A ' between parts 1A and the 1B and the face 1B between 1B ', parts 1B and the 1C " and 1C ", face 1C ' and 1D ' between parts 1C and the 1D.

In addition, fastening screw trip bolt 14 guarantees that

parts

1A, 1B and 1C are joined together with known manner.

On the contrary, realize fixed

component

1C and 1D according to the present invention.These

parts

1C and 1D representative must be transmitted very big moment of torsion according to first assembly of the present invention and second assembly between first assembly and second assembly.

For

fixed component

1C and 1D, motor 100 at first comprises screw 15.These

parts

1C and 1D are pulled to each other, and the surface of contact 1C ' and the 1D ' that therefore constitute according to first surface of contact of the present invention and second surface of contact are pulled to each other.Screw 15 is to apply the device of axial pressure along the axis A of motor 100, and surface of contact 1C ' and 1D ' are pushed each other.

Screw 15 can transmit the moment of torsion of determining between

parts

1C and 1D.

Yet in the described motor, because diameter and/or the limited amount of screw 15, it can not transmit enough moments of torsion between

parts

1C and 1D herein.

And in order to increase the torque value that transmits between parts 1C and the 1D, surface of contact 1C ' becomes the subject of specific setting.Surface of contact 1C ' is through the shot peening after surperficial cure process.As the result of these processing, face 1C ' has become coarse and has become the friction surface that can transmit sizable moment of torsion between

parts

1C and 1D.

Figure 3 illustrates motor part according to a second embodiment of the present invention.

In this embodiment, first assembly according to the present invention not only comprises parts 1C, and comprises other parts, and particularly mounting plate 22.These other parts are used for transmitting moment of torsion between parts 1C and 1D.This plate 22 is packing rings of arranging around the spin axis A of this device (motor 100).At this, packing ring is set to the flat parts of a cardinal principle, is equipped with the hole that enters for another parts.

(it should be noted that mounting plate also can adopt the form of the packing ring among this embodiment, wherein mounting plate only comprises rough surface in the one side).

The both sides relative with plate 22 all have coarse friction surface (24,25).Plate 22 inserts between surface of contact 1C ' and the 1D ', makes friction surface 24 contact with 1D ' with surface of contact 1C ' respectively with 25.At the horizontal plane place of

surface

24 and 1D ', first assembly (parts 1C and plate 22) contacts with second assembly (parts 1D), and

surface

24 and 1D ' constitute first surface of contact and second surface of contact according to the present invention.Surface 1C ' and 25 constitutes the 3rd surface of contact and the 4th surface of contact according to the present invention.

In the embodiment of Fig. 2,

friction surface

24 and 25 is axially aligned in each side upper edge of mounting plate 22.In fact,

friction surface

24 and 25 accurately extends to the right each other vertically on each side of plate 22.

Can better understand the technique effect of plate 22 by Fig. 2 A that

friction surface

24,25 form are shown.

On the described friction surface or a plurality of protuberances at least one of described friction surface (24,25) be sharp; Their formation spikes or tip 26(edge are perpendicular to the cross-section on the plane of plate).When

parts

1C, 22 and 1D assembled and when placing under the axial pressure, tip 26 is pressed in the opposite contact surfaces and (is surperficial 1C ' and 1D ' in this case) by screw 15; They prevent

parts

1C, 22 and 1D between any rotation, any relative slip.

And in an illustrated embodiment, the surface hardness of

parts

1C and 1D is less than the surface hardness of plate 22.And when motor was assembled, this plate was touched screw 15 clampings between face 1C ' and the 1D '.As needs, can use (alternatively) specific extrusion system that strong especially pressure is applied on the mounting plate.Under the effect of this pressure, tip 26 therefore (more shallow ground) passes parts 1C and 1D.And after installing, in fact the thickness that is occupied by the plate 22 between the surface of contact is basically less than its original depth, and is about the minimum thickness (thickness e, Fig. 2 A) of the plate of measuring at the place, bottom of the concaveconvex structure of friction surface.In fact, for the packing ring of the thickness with about 1mm, between erecting stage, can determine about 0.1 to 0.3mm thickness loss.

When installing by this way, plate 22 closely is connected to

parts

1C and 1D, and can transmit very big moment of torsion in these parts each other.And, advantageously, can during the maintenance operation of device, implement the present invention by repacking at new device.

Can be set to have the ccontaining recess (uptake recess) 28 for plate in order to embed mounting plate 22, the second surface of contact and/or the 3rd surface of contact (1C ', 1D '), this ccontaining recess is set to admit mounting plate 22.(it should be noted that so ccontaining recess that is used for this plate can be set in one embodiment, and wherein this mounting plate only has coarse surface in a side).

Different structures also is feasible.

In second embodiment and the 3rd embodiment (Fig. 4 is to Fig. 8), recess 28 is arranged on the face 1D ', and it is smooth that face 1C ' keeps.This also is the situation in the modification shown in Fig. 9 A.In this way, second surface of contact and the 3rd surface of contact kind only one (1D ') comprise the ccontaining recess 28 for plate, another surface of contact 1C ' arranges a recess.

On the contrary, in the modification shown in Fig. 9 B, the ccontaining recess 30 of plate, 31 arranges on two surface of contact 1C ' and 1D ' symmetrically.In this structure, seal joints is arranged between two face 1C ' and the 1D ' symmetrically.

If plate 22 is providing clear and definite gain aspect the moment of torsion transmission, then usually also must form specific arrangement and guarantee the sealing that is connected between parts 1C and the 1D.In fact need to prevent any fluid from motor 100 internal leak between parts 1C and the 1D to the outside.

In order to ensure sealing, device 100 comprise seal arrangement 40 with two surface of contact preventing from being in contact with one another (1C ', 25; 24,1D ') radially fluid is communicated with between.

These devices can adopt various ways.In the example shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, seal arrangement 40 comprises on each side that is arranged on packing ring 22 and two the O type rings 42,43 coaxial with packing ring 22.These joining portion extend to the right of surface of contact continuously on the whole outer rim of motor, and prevent that any fluid inside from motor between face 1C ' and 1D ' from entering into the motor outside.They guarantee Continuous Contact between face 1C ' and the plate 22 on the one hand, guarantee the Continuous Contact between plate 22 and the face 1D ' on the other hand.

And plate 22 has towards the joining

portion

42,43 sealing surfaces, just, and when joining

portion

42,43 can form the surface of sealing when sealing surfaces is extruded.In the case, these surfaces are arranged on the smooth surface on interior week of the plate 22 on each side at joining portion.

In another embodiment, illustrated by Fig. 7 and Fig. 8, seal arrangement 40 at packing ring 22(for example comprises respectively, post forming) both sides on two fixing joining portion 44,45.This embodiment is simplified to the installation of plate 22 by packing ring that to make two joining portion are reliable degree.

The one or more seal joints that are arranged in the seal arrangement 40 can be by with different structure settings.

In one embodiment, seal arrangement (40) comprising: at least one seal joints (42,43,46) is set to form sealing between two plat surface; And groove 50, be formed among the surface of contact 1D ' and be set to admit described seal joints 46, and allow seal joints 46 distortion.

For example, in Fig. 9 A, joining portion 46 is set to form sealing at face 1C '.Face 1D ' comprises the groove 50 that is set to for admitting joining portion 46.In this structure, plate 22 helps to keep joining portion 46, and groove 50 is more shallow.

In expression above, such plat surface represented especially in term " plat surface ": do not have concaveconvex structure against the sealing of described plat surface joining portion, described plat surface may contact to improve sealing with the joining portion.In this way, (described plat surface) advantageously generates sealing on this surface, do not need specific processing (as machining).

In one embodiment, seal arrangement 40 comprises the joining

portion

46,47 that is inserted between the second surface of contact 1D ' and the 3rd surface of contact 1C ', and these joining

portion

46,47 are arranged to directly with each of these faces and contact.

In the case, this joining portion can radially be placed on inboard or the outside of packing ring.Therefore, have between the sealing function of being guaranteed by the joining portion and the moment of torsion propagation function of being guaranteed by plate 22 especially and separate (dissociation).

In Fig. 9 A and Fig. 9 B, provided an one exemplary embodiment.In these figure, guarantee the parts 1C of housing and the sealing between the 1D in a conventional manner by the O type ring that is located between surperficial 1C ' and the 1D '.Joining portion in the case radially is placed on the inboard of plate 22, and is independently with respect to plate 22.Advantageously, use the edge of packing ring 22 to keep joining portion (46,47).

The present invention is described to have the motor of radial piston in preamble.Certainly, the present invention can be implemented as the hydraulic pressure installation of multiple other types, especially has the pump of axial piston.

Now repeatedly test to verify effect of the present invention.What can determine is, when as shown in Figure 3 retaining washer was inserted between two elements to be fixed, the Maximum Torque that can transmit between two elements of oil hydraulic motor can be three times original (for example increasing to 27500Nm from 9000Nm).

Claims

1. hydraulic pressure installation (100) such as motor or pump comprising: first element (1C), and it comprises housing parts (1C), is provided with cylinder body (2) in this housing parts; And second assembly (1D), be fixed to described first assembly,

Described first assembly and second assembly have first surface of contact and second surface of contact (1C ', 1D ') respectively, and described first surface of contact and second surface of contact are pushed by the device that applies axial pressure (15) and toward each other by arrangement with being in contact with one another,

This device is characterised in that, described first surface of contact and second surface of contact one of at least have coarse friction surface (24,25), in order between described two assemblies, to transmit high moment of torsion.

2. device according to claim 1, wherein said first assembly (1C, 22) also comprises mounting plate (22);

Described first surface of contact (24) and second surface of contact (1D ') be respectively formed on the wall relative with described second assembly (1D) with described mounting plate;

And, on the wall relative with described mounting plate with described housing parts, form the 3rd surface of contact (1C ') and the 4th surface of contact (25) respectively; And

One of them of described the 3rd surface of contact and the 4th surface of contact has coarse friction surface (25), in order to transmit high moment of torsion between described housing parts and described mounting plate.

3. device according to claim 2, wherein on each side of this mounting plate (22), described friction surface (24,25) aligns vertically.

4. according to claim 2 or 3 described devices, wherein this second surface of contact and/or the 3rd surface of contact have the ccontaining recess (28) for plate, and this ccontaining recess is set to admit this mounting plate (22).

5. device according to claim 4, wherein only this second surface of contact and the 3rd surface of contact one of them (1D ') comprises the ccontaining recess for this plate, another surface of contact (1C ') is provided with a recess.

6. according to each described device in the claim 2 to 5, wherein this plate (22) is the packing ring that the spin axis (A) around this device is arranged.

7. according to each described device in the claim 1 to 6, one of them of wherein said friction surface or described friction surface (24,25) has greater than the roughness index Ra of 12 μ m or greater than the roughness index Rz of 80 μ m.

8. according to each described device in the claim 1 to 7, wherein the protuberance on the one at least of described friction surface or described friction surface (24,25) is sharp.

9. according to each described device in the claim 1 to 8, the one at least in wherein said friction surface or the described friction surface (24,25) has the Vickers hardness greater than 450HV.

10. according to each described device in the claim 1 to 9, wherein at least one surface of contact staggered relatively with a friction surface (24,25) (1C ', 1D ') has the surface hardness less than this friction surface.

11. according to each described device in the claim 1 to 10, wherein this device comprises seal arrangement (40), in order to two surface of contact preventing from being in contact with one another (1C ', 25; 24,1D ') radial fluid between is communicated with.

12. device according to claim 11, wherein sealing device (40) comprises at least one seal joints (42,43,46), described seal joints is set to form sealing between a plane and groove (50), this groove (50) is formed in the surface of contact (1D ') and is set to admit described seal joints (46), and allows described seal joints (46) distortion.

13. device according to claim 11, wherein sealing device (40) comprises joining portion (46,47), and this joining portion (46,47) are plugged between this second surface of contact and the 3rd surface of contact and are placed as with these faces and all directly contact.

14. the production method of a hydraulic pressure installation may further comprise the steps:

A) provide first element and second element (1C 1D), makes:

-two described assemblies can be fixed to one another, to constitute hydraulic pressure installation (100), for example motor or pump;

-two described assemblies have first surface of contact and second surface of contact (1C ', 1D ') respectively;

-this first assembly comprises housing parts (1C), is provided with cylinder body (2) in this housing parts;

D) two described assemblies of assembling to settle two surface of contact by the device that applies axial pressure (15) with being in contact with one another;

The method is characterized in that its further comprising the steps of b):

B) at the coarse friction surface (24,25) of one of them formation of described surface of contact, to allow between two described assemblies, transmitting high moment of torsion.

15. manufacture method as claimed in claim 14 also comprises step b) step c) afterwards:

C) carry out surface treatment for increasing the surface hardness of friction surface, make the surface hardness of the surface of contact relatively placed with described friction surface (24,25) (1C ', 1D ') less than the surface hardness of this friction surface.