CN102245902A

CN102245902A - Pump unit

Info

Publication number: CN102245902A
Application number: CN2009801505848A
Authority: CN
Inventors: H·西格尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2008-12-16
Filing date: 2009-11-18
Publication date: 2011-11-16
Also published as: WO2010072476A3; EP2379890A2; EP2379890B1; WO2010072476A2; DE102008054758A1

Abstract

The invention relates to a pump unit (10) comprising a housing (12), which has a first housing part (20) and a second housing part (22) with at least one pump element (28) in the form of a gear (34), housed between the first housing part (20) and the second housing part (22), the housing parts (20, 22) being connected to each other by means of a connector device (74). According to the invention, in addition to the connector device (74) a force generating device (96) is provided for generating a housing closing force (98) acting between the housing parts (20, 22).

Description

Feedway

Technical field

The present invention relates to feedway according to claim 1 preamble.The invention particularly relates to a kind of gear pump.

Background technique

By DE 10 2,006 056 843A1 known a kind of feedway with three partial shell, these partial shell penetrate screw by one and assemble, this screw can be configured rotary screw.

Summary of the invention

Task of the present invention is to provide a kind of feedway, and it has impregnable at least to a great extent conveying characteristic in a wide temperature range of feedway temperature.

This task will be by having claim 1 the feedway of feature solve.

Provided favourable further configuration in the dependent claims.Can obtain for the present invention important feature in addition in explanation below and the accompanying drawing, but wherein these features both can be individually also various combination ground and need not once more this to be pointed out clearly as emphasis of the present invention.

Can produce the housing closing force that acts between the housing parts according to force generating apparatus of the present invention, the expanded reaction of this housing closing force housing during to the housing heating.Therefore can irrespectively produce an additional housing closing force with a power that produces by connection set.

Have recognized that in scope of the present invention: the housing parts of housing will expand when the feedway heating; And this heating will have influence to gap size that exists between the housing parts and/or the gap size that exists between housing parts and at least one transfer unit.This gap size has direct influence to the volumetric efficiency and the mechanical efficiency of feedway again.The increase of gap size can cause the increase of leakage flow, so that the volumetric efficiency variation of feedway.Gap size between at least one transfer unit and at least one housing parts dwindle the increase that can cause frictional force between these parts so that the mechanical efficiency variation of feedway.Can reach by the housing closing force that is provided by force generating apparatus: described gap size does not change or only unconspicuous change.Make the volumetric efficiency and the mechanical efficiency of feedway in a wide temperature range, in very big transmission, keep constant at least thus.

In the known connection set rotary screw can be set in DE 10 2,006 056 843A1, the expansion of it and housing is correspondingly also expanded.Differently will irrespectively produce the housing closing force with connection set by force generating apparatus according to the present invention therewith, this housing closing force can stop the expansion of housing parts and the obvious change of above-mentioned gap size at least to a great extent in a wide temperature range.

The invention particularly relates to the fuel delivery means that is used for Motor Vehicle.This feedway can be worked in a wide temperature range, and this temperature range reaches relevant with the pressure and the amount of fuel to be carried or that be transferred with the ambient temperature of Motor Vehicle.

A form of implementation of the present invention is that housing parts is along the housing axis arranged; And the housing closing force acts on the direction with the housing shaft line parallel with pro rata distributing at least.This can make the housing closing force be delivered on the housing parts especially simply.

The housing closing force is preferably a pressure, and it is pressed in first housing parts on second housing parts.Housing closing force is produced especially simply for this and feedway has simple structure.

Advantageously, this pressure acts on the housing face of carrying second housing parts of first housing parts.This can make the housing closing force import in the housing especially simply.

Particularly advantageously be, but force generating apparatus comprises that one is used to receive and is loaded or the reservoir chamber of the fluid of on-load pressure, can at least produce the housing closing force by this fluid with pro rata distributing.Can produce extra high housing closing force by fluid.It also is variable deciding this housing closing force on the pressure-loaded of fluid.

Particularly preferably be, this fluid is made of the medium that is sent by this feedway.Can and produce the housing closing force by the medium that is transferred itself in the case by feedway.Therefore do not need other device of using other medium and/or being used for the convection cell on-load pressure.

Particularly preferably be, the reservoir chamber forms being connected of fluid effect with the pressure span of feedway or integrally constitutes with the latter.Can obtain the simple especially feedway of a structure thus.

To produce housing closing force conversion ground or additionally by the fluid that is loaded pressure, the power production part of a machinery can be set, can at least produce the housing closing force by this mechanical power production part with pro rata distributing.The power production part of such machinery can be realized the housing closing force that a working state with feedway irrespectively produces.

Preferably this at least one mechanical power production part is configured the form of a spring.Especially be the form that produces a stage clip of pressure.

A form of implementation according to the present invention proposes: this at least one mechanical power production part is made of a member that separates with connection set.This member allows irrespectively to produce the housing closing force with the expansion of connection set.

When the connected element of at least one mechanical power production part and connection set constitutes integratedly when this, can reduce the part count of feedway.

Hereinafter with reference to accompanying drawing form of implementation of the present invention is described.

Description of drawings

Fig. 1: along the front view of a feedway of the line of representing with I-I among Fig. 2 of dissecting;

Fig. 2: along the side view of the feedway of the line of representing with II-II among Fig. 1 of dissecting; And

Fig. 3: with the side view of another form of implementation of the corresponding feedway of the line of representing with III-III among Fig. 1 of dissecting.

Embodiment

A form of implementation of the feedway of indicating generally by label 10 in Fig. 1 and 2 is constituted as an internal gear pump.Feedway 10 comprises a housing 12, and this housing extends in driving side 16 and on the pressure side between 18 along a housing axis 14.

Housing 12 has one and is arranged on first housing parts 20 and second housing parts 22 of arranging that covers side with being adjacent.Form of implementation middle shell 12 shown in this also comprises the 3rd housing parts 24, and it is adjacent with second housing parts 22 and be set on second housing parts 22 and the sides first housing parts, 20 opposition.

First housing parts 20 and second housing parts 22 jointly define a receiving chamber 26, receive

transfer unit

28,30 therein.First transfer unit 28 is configured the form of a gear 32, and it is meshed with second transfer unit 30 that is configured the gear forms of hollow wheel gear 34.Around 36 rotations of a driving axis, the relative housing axis 14 of this driving axis extends abreast at feedway 10 duration of work gears 32.Center on housing axis 14 rotations of staggering with driving axis 36 at feedway 10 duration of work hollow wheel gears 34.

Gear 32 is connected with a live axle 38 antitorque commentaries on classics ground.Live axle 38 is supported in the bearing sleeve 40, and this bearing sleeve especially integrally constitutes with second housing parts 22.Bearing sleeve 40 is received in again in the support section 41 of a cylindrical sleeve form, and this support section preferably integrally constitutes with the 3rd housing parts 24.

Live axle 38 can drive by a drive section 42 that is arranged on the end.This drive section for example constitutes with the form of an interior hex surface 44.

Relative the 3rd housing parts 24 of the end section of live axle 38 seals by the seal arrangement 46 of a driving side.

The 3rd housing parts 24 has a flange plate 48 that integrally constitutes with it, by this flange plate can make feedway 10 be fixed on a unshowned carrier, for example on internal-combustion engine.

The 3rd housing parts 24 has one and is used to be transferred medium, is particularly useful for the suction side input end 50 of oil or fuel and one output terminal 52 on the pressure side.Input end 50 especially constitutes with the form in a hole 50, and it leads to a suction waist pipe 54 that is formed in the 3rd housing parts 24.Suction waist pipe 54 forms with a suction areas 58 of feedway 10 by a hole 56 that is formed in second housing parts 22 and is connected.

Output terminal 52 is used with pressure waist pipe 60 formation that are formed in the 3rd housing parts 24 at fluid and is connected.Pressure waist pipe 60 is used with a pressure span 64 of feedway 10 at fluid by a hole 62 that is formed in second housing parts 22 and is connected.

Comprise a crescent shape section 66 that is arranged in the receiving chamber 26 in order to isolate suction areas 58 with pressure span 64 these feedways 10, this section preferably integrally constitutes with second housing parts 22.

The

hole

56 and 62 of second housing parts 22 is configured and suction areas 58 or pressure span 64 corresponding waist shapes.In first housing parts 20, be adjacent to be provided with the

cavity

68 and 70 of waist shape with the

transfer unit

28,30 of gear 32 and hollow wheel gear 34 forms.The plane of rotation 72 of

cavity

68,70 relative gears 72 is arranged and moulding with

hole

56 or 62 mirror-symmetrical ground.Can realize by waist shape cavity 68 and 70: the

transfer unit

28 and 30 of feedway 10 duration of work gears 32 and hollow wheel gear 34 forms in the axial direction from the pressure load of driving side 16 with from the pressure side 18 pressure load is identical.

For the connection of

housing parts

20,22 and 24, feedway 10 comprises one always with 74 connection sets of indicating.Connection set 74 has a connected element 76, and this connected element especially is configured jar shape and surrounds two

housing parts

20,22 at least.Connected element 76 has the side section 80 of 78, one cylindrical sleeve shapes that are connected with the lid section of a lid section and the edge section 82 of an opposite flank section bent angle in an illustrated embodiment.

Edge section 82 is caught the section 84 of a shoulder form of the 3rd housing parts 24 from behind.Section 84 shapes of first housing parts, 20, the second housing parts 22 and the 3rd housing parts 24 are received in the connected element 76 sealedly.Between the side section 80 of second housing parts 22 and connected element 76, be provided with the Sealing 86 of an annular for relative outside seal.

Waist shape cavity 70 be set at first housing parts 20 on a side of receiving chamber 26.Cavity 70 is used (for example by a conduit 88) and is connected with a reservoir chamber 90 at fluid.Reservoir chamber 90 is the outside housing face by first housing parts 20 92 and limiting by one of connected element 76 inside capping 94 basically.Use by cavity 70 and conduit 88 at fluid and be connected with the pressure span 64 of feedway 10 reservoir chamber 90.

For relative suction areas sealed storage chambers 90 58 are provided with a lip ring 95, it especially is the form of an O RunddichtringO.Sealing 95 be set at first housing parts 20 and-between the lid section 78 of connected element 76 and the side section 80-transition portion between.

When feedway 10 duration of works, for example during transfer the fuel or oil the member of feedway with heating.According to for connection set 74 and for

housing parts

20,22,24 selected materials can occur when feedway 10 heating: the axial clearance that has between

housing parts

20 and 22 or 22 and 24 that expands of the difference by described member can strengthen.Make the volumetric efficiency variation of feedway thus.For anti-problem here, feedway 10 comprises a force generating apparatus 96.

Force generating apparatus 96 produces a housing closing force 98, and this power especially forms with the form of pressure.Housing closing force 98 is pressed onto first housing parts 20 on second housing parts 22.Housing closing force 98 acts on the housing face 92 of first housing parts 20.Thus the increase of pressing close to the gap between first housing parts 20 and second housing parts 22 on axial is played opposite effect.

Can use a fluid that is loaded pressure that is arranged in the apotheca in order to produce housing closing force 98.Medium, especially fuel or oil that this fluid is preferably carried by feedway 10.Inject the pressure-loaded that the medium that is transferred also can guarantee this medium by both guaranteeing reservoir chamber 90 being connected of fluid effect between pressure span 64 and the apotheca 90.Form a pressure pad thus between the housing face 92 of the lid section 80 of connected element 76 and first housing parts 20, this pressure pad is being pressed first housing parts 20 on the direction of second housing parts 22.

To produce housing closing force 98 conversion ground or additionally by the fluid that is loaded pressure, can also produce the housing closing force by the power production part 100 of machinery.Power production part 100 preferably is configured the form of spring 102, especially is a saucerspring.Power production part 100 is supported on the lid section 78 of connected element 76 and is pressed on the housing face 92 of first housing parts 20 in the lid side.First housing parts 20 is pressed on second housing parts 22.

Particularly preferably be, the power production part 100 of machinery is set in the reservoir chamber 90, as shown in Figure 2.In this way housing closing force 98 can pro rata distribute by fluid pressure-loaded and produce by the power production part 100 of a machinery.

By the housing closing force first housing parts 20 is pressed on second housing parts 22, and second housing parts 22 is pressed on the 3rd housing parts 24, so that when the feedway heating, can prevent the formation of the axial clearance between housing parts 22 and 24.This also helps the load that goes of lip ring 86.

Another form of implementation of a feedway 10 of expression among Fig. 3.The difference of this feedway and top form of implementation with reference to Fig. 1 and 2 described feedways 10 is the structure of force generating apparatus 96.

This force generating apparatus 96 also comprises a spring 102.But this spring is not the connected element 76 with connection set 74 to be provided with dividually, but integrally constitutes with the lid section 78 of connected element 76.Spring 102 relative housing axis 14 are decided to arrange middlely and produce a housing closing force 98, and this power is pressed onto first housing parts 20 on second housing parts 22.Can guarantee by spring 102: lid section 78 is being close under the prestressing force effect on the outside housing face 92 of first housing parts 20 all the time.

In addition can be with reference to above to the structure of the feedway 10 shown in Fig. 1 and 2 and the description of working method for the structure and the working method of the feedway shown in Fig. 3 10.

Claims

1. feedway (10), especially gear pump, be provided with a housing (12) and at least one especially constitutes the transfer unit (28) of gear (34), this housing comprises first housing parts (20) and second housing parts (22), this transfer unit is received between this first housing parts (20) and second housing parts (22), wherein, described housing parts (20,22) interconnect by connection set (74), it is characterized in that: this connection set (74) is additionally provided with is used for producing the force generating apparatus (96) act on the housing closing force (98) between the described housing parts (20,22).

2. according to the feedway (10) of claim 1, it is characterized in that: described housing parts (20,22) arranges that along housing axis (14) described housing closing force (98) at least acts on the direction parallel with described housing axis (14) with pro rata distributing.

3. according to the feedway (10) of claim 1 or 2, it is characterized in that: described housing closing force (98) is pressure, and it is pressed in described first housing parts (20) on described second housing parts (22).

4. according to the feedway (10) of claim 3, it is characterized in that: this pressure acts on the housing face (92) of described second housing parts of carrying of described first housing parts (20) (22).

5. according to each feedway (10) in the above claim, it is characterized in that: described force generating apparatus (96) comprises and is used to receive the reservoir chamber (90) that maybe can be loaded the fluid of pressure that is loaded pressure, can at least produce described housing closing force (98) by this fluid with pro rata distributing.

6. according to the feedway (10) of claim 5, it is characterized in that: this fluid is by being constituted by the medium that this feedway (10) is carried.

7. according to the feedway (10) of claim 5 or 6, it is characterized in that: described reservoir chamber (90) form being connected of fluid effect with the pressure span (64) of described feedway (10) or integrally constitute with this pressure span.

8. according to each feedway (10) in the above claim, it is characterized in that: described force generating apparatus (96) comprises the power production part (100) that at least one is mechanical, can at least produce described housing closing force (98) by this power production part with pro rata distributing.

9. feedway according to Claim 8 (10) is characterized in that: at least one mechanical power production part (100) constitutes with the form of spring (102).

10. it is characterized in that according to Claim 8 or 9 feedway (10): at least one mechanical power production part (100) is made of the member that separates with described connection set (74).

11. each feedway (10) in 10 according to Claim 8, it is characterized in that: at least one mechanical power production part (100) constitutes integratedly with the connected element (76) of described connection set (74).