CN101688532B

CN101688532B - Gear pump

Info

Publication number: CN101688532B
Application number: CN2008800172405A
Authority: CN
Inventors: M·约尔丹
Original assignee: TRW Automotive GmbH
Current assignee: ZF Automotive Germany GmbH
Priority date: 2007-05-24
Filing date: 2008-04-23
Publication date: 2012-02-01
Anticipated expiration: 2028-04-23
Also published as: WO2008141714A1; DE102007024190A1; CN101688532A

Abstract

The invention relates to a gear pump for a power-assisted steering, having a housing (12) in which a pump chamber (18) is formed, and a pump cover (30) which forms the boundary of the pump chamber (18), wherein the pump cover (30) is provided with a sound-absorbing coating (32) and is composed of a first fixing structure (250), the first fixing structure is configured to be embedded in a corresponding second fixing structure (252) on the housing (212, 312).

Description

Gear pump

Technical field

The present invention relates to a kind of gear pump, be used for servo steering device.

Background technique

Such pump is used in the power-assisted steering system of Motor Vehicle according to the parts of standard as motor-pump complete sets of equipment.

In view of its structure, gear pump is owing to the pulsed FLUID TRANSPORTATION tends to produce noise.Therefore, except the simple and economic manufacturing of making every effort to pump, also exist to reduce the requirement that noise produces.

So for example DE 102005002757A1 discloses a kind of gear pump, wherein the pump chamber at housing partly and between the pump cover is provided with flat seal.But additional member must be installed here, this has increased manufacture cost.

Summary of the invention

The objective of the invention is to, a kind of can simply make and pump with good noise suppression is provided.

According to the present invention, this realizes that by this way promptly, this gear pump has: housing constitutes pump chamber in this housing; And the pump cover that defines this pump chamber; Wherein pump cover is provided with the coating of noise elimination, and said pump cover has first fixed structure, and this first fixed structure is configured for rabbeting in second fixed structure of the correspondence on housing.Continue to transmit in order to reduce the sound that from pump case, comes out, coating is verified to be effectively.On manufacturing technology, can apply coating fast and simply.Can be integrated in the pump cover because can cancel the element and the noise elimination structure of independent noise elimination, thus the quantity of essential member and thereby the quantity of manufacturing step reduce, this makes pump more economical.

Coating can be the suitable elastomer with suitable thickness.

Pump cover preferably is made up of the steel plate that scribbles said coating.The combination meter of steel plate and coating reveals good sound decoupling zero characteristic.

If the both sides of pump cover are scribbled said coating, then the coating in the outside also can be used as except its acoustic characteristics at pump and the Sealing between the motor casing that is connected on the pump cover on the pump.

Inboard coating also can be used as Sealing, and for example as unique or additional Sealing of (pump) spectacle side plate, the shaft end of each gear of gear pump is bearing in this spectacle side plate.

In a form of implementation of the present invention, pump cover has first fixed structure, and this first fixed structure is configured for rabbeting in second fixed structure of the correspondence on housing.Traditionally, pump cover is fixed on the housing via the fastening piece that the opening that passes alignment inserts.This job step is consuming time and thereby be disadvantageous.According to the present invention, fixing then can set up through the mutual interlocking of each fixed structure simply, additional thus fastening piece is unnecessary.

Preferably, first fixed structure can be realized being connected with the kayser of second fixed structure, thereby can realize the fixing instrument that need not add of pump cover on housing on the housing through simply pump cover being installed to.

First fixed structure can have for example two fixed tabs.They for example lock around the convexity of second fixed structure.

Can certainly use additional traditional fastening piece perhaps to pass through each fixed structure of material deformation locking of pump cover or housing.

Preferably, first fixed structure constitutes with pump cover integratedly, so that make the quantity of essential member keep for a short time.Therewith correspondingly, second fixed structure can be integratedly and housing molding.

In another preferred form of implementation, in the cover of housing, constitute seal groove in the pump chamber side, this allows to simplify the shape that can be installed in the spectacle side plate in this zone.

In addition, the locating stud that at least one is rabbeted in the corresponding recess on pump cover constitutes with housing integratedly, and the quantity of each essential thus member descends equally.

Description of drawings

Explanation to a plurality of embodiments draws other features and advantages of the present invention with reference to accompanying drawing by following.Among the figure:

Fig. 1 illustrates the partial sectional view according to the schematic perspective of gear pump of the present invention according to first form of implementation;

Fig. 2 illustrates the pump among Fig. 1 with exploded view;

Fig. 3 illustrates the partial sectional view according to the schematic perspective of gear pump of the present invention according to second form of implementation;

Fig. 4 illustrates the partial exploded view of the pump among Fig. 3;

Fig. 5 illustrates the partial sectional view according to the schematic perspective of gear pump of the present invention according to the 3rd form of implementation; And

Fig. 6 illustrates the exploded view of the pump among Fig. 5.

Embodiment

Fig. 1 illustrates and is used for vehicle booster and turns to the gear pump 10 that is.

Here, housing 12 is made up of with the pump chamber part 16 that is connected with this cover cover 14, in this housing, constitutes pump chamber 18.Cover 14 is formed by two independent members with pump chamber part 16 in the present embodiment.

In pump chamber 18, be provided with two pitch wheels 20.Its shaft end 22 is contained in two spectacle side plates 24, and wherein one of these two spectacle side plates 24 support the shaft end on two tops, and the shaft end 22 of two bottoms of second spectacle side plate 24 supporting.

Between cover 14 and pump chamber part 16, be provided with the Sealing 26 of two annulars, they lay respectively in the seal groove 28 separately in the cover 14.One of the outside in these two Sealings 26 at the transition part of this sealing from cover 14 to pump chamber part 16, and of the inboard in these two Sealings 26 is based upon the spectacle side plate 24 on top and the sealing between the cover 14.

On the end relative with cover 14, pump chamber 18 defines through pump cover 30.This pump cover is flat basically plate, and this plate only has for the important opening of the function of gear pump 10, also will describe these openings in more detail below.

Pump cover 30 is made up of steel plate, and this steel plate fully is provided with coating on a side of pointing to pump chamber 18, be for example rubber of elastomer here.Coating 32 has the noise elimination effect.Pump cover 30 forms the element of a noise elimination, this element absorb since the vibration that the pulsed motion of gear pump produces also thereby make the sound decoupling zero of gear pump 10 with respect to environment.

Coating 32 is being chosen to aspect thickness and the characteristic, make its shown in instance in also bear sealing function and make pump cover 30 with respect to 24 sealings of the spectacle side plate of pump chamber part 16 or bottom, thereby its replaces being arranged on usually the Sealing in this zone.

A side that deviates from pump chamber part 16 of pump cover 30 is provided with elastomer coating equally.This elastomer coating causes gear pump 10 with respect to the sealing of (unshowned) motor unit that is connected the there.

In pump cover 30, constitute an opening 33, one of shaft end 22 passes this opening and stretches out, so that affiliated gear 20 can be arranged on the motor driven in the motor unit by (unshowned).

In addition, in pump cover 30, constitute an import 34, this import is in to flow with pump chamber 18 and is connected, and hydraulic fluid arrives in the pump chamber 18 through this import.In cover 14, be provided with an outlet 36, this outlet is in mobile the connection with pump chamber 18 on the high pressure side of gear pump 10, and the hydraulic fluid that pump is inhaled leaves gear pump 10 through this outlet.

In pump chamber part 16, also constitute the recess that is used for locating stud 38, these recesses align with corresponding recess 40 in cover 14 and in pump cover 30 under the state of assembling.Cover 14, pump chamber part 16 and pump cover 30 through fastening piece 42, here be screw together, these fastening pieces be passed in the cover 14, in pump chamber part 16 and the through hole 44 of the corresponding alignment in pump cover 30 stretch out.

Second form of implementation at gear pump 210 shown in Fig. 3 and 4.The member constant with respect to first form of implementation keeps its reference character of having introduced.

In this form of implementation, cover 14 and pump chamber part 216 connect into the housing 212 of gear pump 210 integratedly.

In this example, each spectacle side plate 24 has a seal groove 228 respectively, and the sealing groove is used to hold the Sealing 226 of W shape.

Pump cover 230 is as being made up of the steel plate with elastomer coating in first form of implementation.Coating 32 that eliminate the noise or sealing can be arranged on the one or both sides of pump cover 30.

Different with first form of implementation, pump cover 230 is not through screw with housing 212 but interfixes through the fixed structure of rabbeting each other.Pump cover 230 has first fixed structure 250, and this first fixed structure is rabbeted with corresponding second fixed structure 252 on housing 212.

First fixed structure 250 has two contact pin 254 opposed on the periphery of pump cover 230, that be bent upwards with pump cover 230 with roughly meeting at right angles.Here, contact pin 254 constitutes with pump cover 230 integratedly.

Corresponding second fixed structure 252 is shaped with the form of two opposed convexities on the periphery of pump chamber part 216, and said convexity has an abutment face 256 and a starting inclined plane 258 respectively.Here, each convexity constitutes with the outer wall of pump chamber part 216 integratedly.

Through this shaping; The form pushing sleeve that pump cover 30 can connect by kayser is to housing 212; Wherein starting inclined plane 258 is at first pressed to the side with contact pin 254; Up to starting inclined plane 258 through the contact pin opening, so contact pin 254 lockings that constitute of elasticity radially and interlocking (hintergreifen) abutment face 256 from behind.

First and second fixed structures 250,252 also can constitute by other assurance kayser ways of connecting naturally.This form of implementation only explain one possible, be used for pump cover 30 is fastened on the instance on the housing 212 by buckle or kayser.

Shown in instance in abandon other fastener.But the fastener of additional routine can be set also.

Sealing 226 is not to constitute lip ring in this example, but constitutes with the W shape, and wherein open end is opposite to the approaching side of the pump chamber 18 that is connected with import 34.

Being of gear pump 310 in the difference of the form of implementation shown in Fig. 5 and 6 with the form of implementation of just having described; The seal groove 328 that is used for W shape Sealing 326 in housing 312 is not to be formed in spectacle side plate 324, but is formed in the cover 314 of housing 312.

The spectacle side plate 324 of bottom realizes with respect to being sealed in here via coating 32 of pump cover 230, like this described in the framework of first form of implementation.

Also can compensate axial clearance via Sealing 26,226,326 by the structure tolerance decision of each member.

Certainly, all characteristics of each form of implementation can freely exchange between each form of implementation in technician's cognitive ability.Particularly, the application that kayser between pump cover and housing connects is not limited to have coating or the application of the pump cover that is made up of steel plate, but also can be used in other the pump.

Claims

1. gear pump is used for servo steering device, and this gear pump has: housing (12,212,312) constitutes pump chamber (18) in this housing; And the pump cover (30,230) that defines this pump chamber (18); It is characterized in that coating (32) and said pump cover that said pump cover (30,230) is provided with noise elimination have first fixed structure (250), this first fixed structure is configured for rabbeting in second fixed structure (252) of the correspondence on the housing (212,312).

2. gear pump according to claim 1 is characterized in that, said pump cover (30,230) is made up of the steel plate that scribbles said coating (32).

3. gear pump according to claim 1 is characterized in that, the both sides of said pump cover (30,230) are scribbled said coating (32).

4. gear pump according to claim 1 is characterized in that, said coating (32) is as Sealing.

5. gear pump according to claim 1 is characterized in that, said first fixed structure (250) has two contact pin (254).

6. gear pump according to claim 1 is characterized in that, said first fixed structure (250) can be realized being connected with the kayser of second fixed structure (252).

7. gear pump according to claim 1 is characterized in that, said first fixed structure (250) constitutes with pump cover (230) integratedly.

8. gear pump according to claim 1 is characterized in that, in the cover (14,314) of housing (12,312), constitutes seal groove (28,328) in the pump chamber side.

9. gear pump according to claim 1 is characterized in that, at least one locating stud (38) of rabbeting in the corresponding recess (40) on the pump cover (30,230) constitutes with housing (12,212,312) integratedly.