CN102257275A

CN102257275A - Internal gear pump

Info

Publication number: CN102257275A
Application number: CN2009801509073A
Authority: CN
Inventors: H·西格尔; M·迈尔; J·阿诺德
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2008-12-16
Filing date: 2009-11-18
Publication date: 2011-11-23
Anticipated expiration: 2029-11-18
Also published as: EP2379891A2; CN102257275B; WO2010072478A2; DE102008054753A1; WO2010072478A3

Abstract

The invention relates to an internal gear pump (14) which comprises an inner rotor (100) which can be driven to rotate about a driving axis (104). The inner rotor (100) can be driven by a shaft (48) which can be or is mounted in an internal combustion engine (12) and which has a shaft section (114) for driving the inner rotor (100), said shaft section (114) being rotatable about the driving axis (104) of the inner rotor (100).

Description

Internal gear pump

Technical field

The present invention relates to internal gear pump according to the preamble of claim 1.

Background technique

By DE 10 2,006 056 844 A1 known a kind of internal gear pump that is used for delivering hydraulic fluid, it has a gear mesh and at least two pressure exports on the pressure side of internal gear pump.Can change quantity delivered by the internal gear pump that only has a small amount of member in this way.

Summary of the invention

Task of the present invention is, a kind of internal gear pump is provided, and it needs as far as possible little structure space and available the least possible member to make.

This task will be by comprising claim 1 a kind of internal gear pump 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.

By using the axle section that can support or be supported in the axle in the internal-combustion engine to drive internal rotor rotatably and will make according to the especially little structure space of internal gear pump needs of the present invention.This internal gear pump does not need independent live axle/supporting axle of presetting usually.Can cancel thus and the motion transfering device take up space or coupling device (for example belt drive unit) are set will move and be delivered to necessity on independent live axle/supporting axle by a drive unit.And according to internal gear pump of the present invention diametrically basically only one of needs around the structure space of described axle section.Axle axially on may only produce a relative internal-combustion engine the unconspicuous prolongation of overall dimension.

The possibility of cancelling independent live axle and can cancelling other motion transfering device not only means the minimizing of the number of components of internal gear pump own, and has reduced the number of components of the whole unit of being made up of internal-combustion engine and internal gear pump.

Described axle relates to camshaft or a bent axle or balanced axle of internal-combustion engine in an advantageous manner.Rotatablely moving of such axle can directly be transmitted into rotatablely moving of internal rotor.

Preferably, the axle section is made of the free axis end that looks up of axle from axle, this free axis end can with or be connected with internal rotor.Can consider in the case, under the situation that keeps the internal-combustion engine shell dimension, make its prolongation, can be used as the axle section that drives internal rotor so that its free end surpasses the end that internal-combustion engine housing ground stretches out and this stretches out.

In addition preferably, shaft end can be introduced into or introduce in the center hole of internal rotor.Relative one also is that shaft end is imported in the center hole of internal rotor and has its advantage being connected of front side and internal rotor of possible shaft end in principle, the structure space on can saving axially.This can realize the compact especially configuration of the housing of internal gear pump.

When the driving axis coaxial line ground of direction of engagement that is used for coupling shaft and internal rotor and internal rotor extends, can obtain the especially simply assembling of internal gear pump.

This internal gear pump of form of implementation according to the present invention is configured crescent internal gear pump.A kind of internal gear pump with compactness of good especially volumetric efficiency can be provided thus.

This internal gear pump of form of implementation according to a conversion of the present invention is configured no half moon-shaped internal gear pump, and it also can realize special compact structure mode.

A particularly preferred form of implementation of the present invention is: the relative external rotor of internal rotor supports prejudicially and has an external tooth part with the interior toothed portion engagement of external rotor; And the interior toothed portion of external rotor constitutes by the roller that is rotatably supported on the external rotor.To improve in this way by the cooperate sealing function realized of external tooth part with interior toothed portion.Such device also can be called as " planet rotor group ".When roller has the roller thin tooth part and when the external tooth of internal rotor partly has been applied a corresponding internal rotor thin tooth part, can realize the further improvement of sealing function.

The invention still further relates to internal-combustion engine with above-mentioned internal gear pump.

The invention still further relates in addition and comprise fuel injection system above-mentioned internal gear pump, that be used for internal-combustion engine.

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

Description of drawings

Fig. 1: have the sketch plan of fuel injection system that an internal-combustion engine and are used for the internal gear pump of transfer the fuel;

Fig. 2: the side view of dissecting that amplifies expression according to the internal gear pump of Fig. 1;

Fig. 3: the view of a corresponding figures 2 when internal gear pump is installed on the internal-combustion engine;

Fig. 4: according to the plan view of first form of implementation of the gear arrangement of the internal gear pump of Fig. 1; And

Fig. 5: according to the plan view of another form of implementation of the gear arrangement of the internal gear pump of Fig. 1.

Embodiment

In Fig. 1 always with label 10 indication be used for the fuel injection system of internal-combustion engine 12 fuelings is comprised an internal gear pump 14.

Fuel injection system 10 has the tank 16 of a deposit fuel.By a pre-transfer pump 18 fuel is transported in the low pressure line 22 by tank 16, this pre-transfer pump is preferably by an adjustable drive unit, especially the drive unit of motor 20 forms drives.The use of a can regulate drive unit by being used for pre-transfer pump 18 can make the quantity delivered of fuel injection system 10 adjusted, so that can reduce the transport loss by the conveying generation of fuel excess quantity, this excess quantity must be transmitted back to again prepares in the container 16.

For the fuel pressure that limits in the low pressure line 22 is provided with a low pressure pressure-limit valve 24, when surpassing a predetermined pressure maximum, fuel is led back in the tank 16 by low pressure line 22 by this low pressure pressure-limit valve.

Low pressure line 22 leads to an input end 26 of internal gear pump 14.This internal gear pump loads high pressure to the fuel by input end 26 inputs.Be loaded the fuel of high pressure pressure duct 30 of an output terminal 28 arrival by internal gear pump 14, this pressure duct imports the fuel collection device of rail 32 forms.32 pairs of injection valves 34 of rail provide the fuel of pressurization.These injection valve 34 each configurations are given a firing chamber of internal-combustion engine 12 and fuel directly is ejected in the firing chamber.

Pressure in the rail 32 detects by a pressure transducer 36.Can flow to a control gear 40 by a data lead 38 with the pressure correspondent voltage signal that detects.Control gear 40 is by a pilot 42 and motor 20 couplings.

Internal-combustion engine 12 comprises the internal-combustion engine housing 44 of a section ground expression, and it for example is the form of a cylinder head.Internal-combustion engine housing 44 has an outside surface of shell 46.Internal-combustion engine 12 also comprises an axle 48, the axle of a camshaft form especially, and this axle can be bearing on the internal-combustion engine housing 44 rotationally around axis 50.

Be provided with a housing bore 52 in internal-combustion engine housing 44, this hole is passed by axle 48, so that shaft end 54 stretches out surface of shell 46 and extends to the periphery of internal-combustion engine 12.

Internal gear pump 14 has the frame 56 of a jar shape, and this frame especially is connected with internal-combustion engine housing 44 by the flange plate 58 in the welding, for example connects by screw.Frame 56 has a housing projection 60 that extends towards internal-combustion engine 12, and this housing projection is inserted in the housing bore 52 of internal-combustion engine 12.Housing projection 60 has its cross section and is circular housing aperture 62, and this aperture allows axle 48 to penetrate.

The frame 56 of internal gear pump 14 and internal-combustion engine housing 44 reciprocally seal by the seal ring 64 of an annular.

In frame 56, be provided with a plurality of housing parts, i.e. first housing parts 66, second housing parts 68 that is adjacent and the 3rd housing parts 70 that plays the housing lid effect.The 3rd housing parts 70 welds mutually with frame 56.Preferably,

housing parts

66,68 and 70 has the plane that is parallel to each other, so that each housing parts constitutes the sealing surface of metal with these planes.Can produce a pressure by the 3rd housing parts 70 in the case, this pressure is pressed in the frame 56

housing parts

66 and 68.

First housing parts 66 and second housing parts 68 are used to limit the pump chamber of receiving chamber 72 forms, arrange a gearing 74 therein.This gearing 74 constitutes the real supply unit of internal gear pump 14.Gearing 74 is placed between first housing parts 66 and second housing parts 68 in the axial direction.First housing parts 66 constitutes a radial support of gearing 74 simultaneously.

Internal gear pump 14 has a low-pressure channel 76 that is connected with input end 26 in low voltage side, and this low-pressure channel is formed in the 3rd housing parts 70.Low-pressure channel 76 feeds a suction waist pipe 78 that is formed in second housing parts 68.First housing parts 66 has one and the corresponding anti-waist pipe 80 of suction waist pipe 78 forms.

Internal gear pump 14 comprises a high-pressure channel 82 that is connected with output terminal 28 on the pressure side, and this high-pressure channel is formed in the 3rd housing parts 70.High-pressure channel 82 is connected with a pressure waist pipe 84 that is formed in second housing parts 68, is provided with one and the corresponding anti-waist pipe 86 of pressure waist pipe 84 forms in first housing parts 66.Can reach by anti-waist pipe 80 and 86: gearing 74 comes on-load pressure equably from both sides.

Internal gear pump 14 also comprises a pressure-limit valve 88 in addition, can be connected at formation fluid between high-pressure channel 82 and the low-pressure channel 76 by this pressure-limit valve when surpassing a predetermined working pressure.Pressure-limit valve 88 is set in the connecting passage 90, and this connecting passage extends between high-pressure channel 82 and the low-pressure channel 76.Pressure-limit valve 88 has 92, one of the valve seats and valve seat 92 interactional valve bodies 94 and the valve spring 96 that are pressed in the connecting passage 90, and this valve spring is pressed in valve body 94 on the valve seat 92.Connecting passage 90 constitutes with the blind hole form and seals by a plug that is pressed into 98 in its flared end.

Input end 26 and output terminal 28 and pressure-limit valve 88 are combined in and just allow to cancel to a great extent additional Sealing in the 3rd housing parts and the number of components of internal gear pump 14 is reduced further.

Gearing 74 has an internal rotor 100, and the relative external rotor 102 of this internal rotor is provided with (referring to Fig. 2 and 4) prejudicially.Internal rotor 100 can be given driving axis 104 rotations of internal rotor 100 around a configuration.Axis 50 coaxial lines of driving axis 104 and axle 48.

Internal rotor 100 has a center hole 106, can import the shaft end 54 (referring to Fig. 3) of axle 48 therein.

Axle 48 has a primary section 108 that extends in the internal-combustion engine housing 44.On primary section 108, connecting axle 112, one axle sections 114 of guide surface that 110, one of shaft parts especially are ball formation and one fore axle journal 116 is being set towards the direction of internal gear pump 14.

Shaft part 110 passes the housing aperture 62 of frame 56.For relative internal gear pump 14 seal shafts 48 are provided with a seal arrangement 118, it especially is configured the form of a radial direction seal ring.The sealing device is set in the housing projection 60 and comprises first sealing lip 120 that summary is represented, can prevent that by it oil from entering into internal gear pump 14 by the interior space of internal-combustion engine 12.This outer sealing device 118 also comprises second sealing lip 122, can prevent that by it fuel is discharged in the interior space of internal-combustion engine 12 by the interior space of internal gear pump 14.

Axle guide surface 112 is bearing in the columniform supporting surface 124, and this supporting surface is formed on first housing parts 66.On supporting surface 124, connecting face 126 in fixed that a relative supporting surface 124 tilts, by this fixed in face a guide surface 112 is imported to become in the supporting surface 124 easy (referring to Fig. 3).

Axle section 114 for example has a multi-arris body profile, four bank or ridge profile especially.The respective profile of the center hole 106 of this profile and internal rotor 100 cooperatively interacts.Can form the sealed antitorque commentaries on classics of shape in this way between axle section 114 and internal rotor 100 is connected.

For axle 48 is engaged with internal gear pump 14, make the axle 48 and the internal gear pump 14 mutual earth's axis with mobile on 128 and 130 direction of engagement of indicating.Direction of

engagement

128 and 130 and driving axis 104 coaxial lines of internal rotor 100.

Axle journal 116 preferably is configured cylindrical and is used for during shaft end 54 importing internal gear pumps 14 auxiliary as further inserting.Under the simplest situation internal gear pump 14 is being enclosed within on the free axis end 54.Effect in will reaching calmly by the guiding of axle guide surface 112 on supporting surface 124 can prevent internal rotor 100 by this fixed middle effect.Clamping.In axle 48 and the damage that prevents seal arrangement 118 during internal rotor 100 is connected like this, promptly shaft part 110 is imported in the housing apertures 62 and with

sealing lip

120 and 122 form cooperates before, at first in the center hole 100 with axle journal 116 insertion internal rotors 100.

The gearing 74 of expression internal gear pump 14 among Fig. 4.External rotor 102 on supporting axle first housing parts 68 can rotate around external rotor axis 132; The driving axis 104 of this axis and internal rotor 100 extends abreast.Driving axis 104 relative external rotor axis 132 stagger, so that internal rotor 100 relative external rotors 102 support prejudicially.

External rotor 102 has an interior toothed portion 134, and the external tooth part 136 of it and internal rotor 100 cooperatively interacts.The interior toothed portion 134 of external rotor 102 constitutes by a plurality of rollers 138, and they respectively are bearing in the bag shape notch 140 that is located on the external rotor 102.

Roller 138 has roller serration 142, and the roller serration is meshed with internal rotor serration 144, and the internal rotor serration is superimposed upon on the internal rotor 100.

Can on driving direction 146, drive internal rotor 100 rotationally by axle 48.Engagement by internal rotor 100 and roller 138 these rollers are also rotated and thus with driving direction 146 corresponding sense of rotation on drive external rotor 102.The fuel that can make input end 26 inputs by internal gear pump 14 in this way is compressed on the pressure side 150 and be transported to the output terminal 28 of internal gear pump 14 by suction side 148.

Also can use a gearing 74 that only comprises an internal rotor 100 and an external rotor 102 to replace the gearing 74 shown in Fig. 4 (" planet rotor group "), wherein the interior toothed portion 134 of external rotor 102 constitutes one with this external rotor.Such internal gear pump 14 also can be called as no half moon-shaped internal gear pump.

Also can use the gearing 74 shown in Fig. 5 to this conversion ground, it also comprises an internal rotor 100 and an external rotor 102, separates suction side 148 and on the pressure side 150 but wherein be provided with crescent parts 152.Such internal gear pump 14 also can be called as crescent internal gear pump.

Preferably, but at least some member prototypes of internal gear pump 14 ground, especially less with the manufacturing of instrument ground.For

example housing parts

66,68 and 70 and/or the gear of gearing 74 can be sintered.Frame 56 and/or flange plate 58 can be configured the sheet metal profiled member in an advantageous manner.

When internal gear pump has oneself a live axle/supporting axle, when promptly not driving by the axle 48 of internal-combustion engine, each feature of internal gear pump 14 described above also is favourable.These features relate in particular to: have frame 56 and housing parts 66, the structure of 68 and 70 housing, the possibility that the quantity delivered of transfer pump 18 is regulated, input end 26 and/or output terminal 28 and/or pressure-limit valve 88 are combined in the configuration that reaches gearing 74 in the housing parts 70.

Claims

1. having at least one can be around the internal gear pump (14) of the driven rotatably internal rotor of driving axis (104) (100), it is characterized in that: this internal rotor (100) can drive by the axle (48) that can support or be bearing in the internal-combustion engine (12), and this axle has the axle section (114) that is used to drive this internal rotor (100) that can rotate around this driving axis (104) of this internal rotor (100).

2. according to the internal gear pump (14) of claim 1, it is characterized in that: this axle (48) is camshaft or the bent axle or the balanced axle of internal-combustion engine (12).

3. according to the internal gear pump (14) of claim 1 or 2, it is characterized in that: this section (114) is made of an axle from this axle (48) shaft end (54) that looks up freely, this shaft end can with or be connected with this internal rotor (100).

4. according to the internal gear pump (14) of claim 3, it is characterized in that: this shaft end (54) can be introduced into or be introduced in the center hole (106) of this internal rotor (100).

5. according to each internal gear pump (14) in the above claim, it is characterized in that: be used to connect this axle (48) and direction of engagement (128,130) of this internal rotor (100) and driving axis (104) the conllinear ground extension of this internal rotor (100).

6. according to each internal gear pump (14) in the above claim, it is characterized in that: this internal gear pump is configured crescent internal gear pump.

7. according to each internal gear pump (14) in the claim 1 to 5, it is characterized in that: this internal gear pump is configured no half moon-shaped internal gear pump.

8. according to each internal gear pump (14) in the above claim, it is characterized in that: this internal rotor (100) relatively external rotor (102) is supported prejudicially and has an external tooth part (136) with interior toothed portion (134) engagement of this external rotor (102), this external rotor (102) should in toothed portion (134) constitute by the roller (138) that is rotatably supported on this external rotor (102).

9. internal-combustion engine (12) has according to each internal gear pump (14) in the claim 1 to 8.

10. the fuel injection system (10) that is used for internal-combustion engine (12) comprises according to each internal gear pump (14) in the claim 1 to 8.