DE102014203193B4 - Adjustable vane pump - Google Patents

Abstract

Adjustable vane pump (10), in particular oil pressure pump, with a cup-shaped housing (12) and with a rotor (18) rotatably mounted in the housing (12) about a rotor axis (16) and carrying at least one vane (22) movably mounted in the radial direction, wherein the housing (12) comprises transversely to the rotor axis (16) a first contact surface (24) and a second contact surface (26) for the rotor (18) together with vanes (22),
wherein the second contact surface (26) is formed by a housing bottom (30),
wherein the housing (12) between the run-on surfaces (24, 26) arranged, the rotor (18) including wings (22) enclosing and transverse to the rotor axis (18) adjustable adjusting housing (32) and the adjusting housing (32) surrounding the base housing ( 44), and
wherein the axial extent (A) of the base housing (44) is greater than the axial extent (A) of the adjusting housing (32), the rotor (18) and / or the at least one wing (22), characterized in that in the housing bottom (30) a suction inlet (46) and a pressure outlet (48) are provided, wherein the suction inlet (46) is surrounded by a molded seal (50) provided on the housing bottom (30) such that an upper side of a channel (76) provided facing the housing bottom (30) ) can be applied under prestressing close to the mold seal to the suction inlet (46) tight with the Channel (76) to connect, wherein an outer housing (52) surrounding the base housing (44) is provided, wherein the outer housing (52) projects beyond the base housing (44) in the axial direction and the housing base (30) projects at least in sections from the outer housing (52). is enclosed, wherein for sealing the outer housing (52) relative to the housing bottom (30) on the housing bottom (30) a circumferential sealing ring (58) is provided, wherein the housing bottom (30) has an annular collar (54) having an outer surface of the outer housing is substantially flush, and wherein in the region of the annular collar (54) a circumferential sealing ring (56) for sealing engagement with a vane pump (10) receiving receptacle (74) is provided.

Description

The invention relates to an adjustable vane pump, in particular an oil pressure pump, with a cup-shaped housing and with a rotatably mounted in the housing about a rotation axis rotor. The rotor thereby carries at least one movable in the axial direction on the rotor wings. The housing in this case has a transversely extending to the rotor axis, first, in particular upper contact surface and a parallel, second, in particular lower contact surface for the rotor and vanes on. The second contact surface is thereby formed by a housing bottom, wherein the housing comprises a arranged between the contact surfaces, the rotor including the wing enclosing and adjustable transversely to the rotor axis adjustment housing and the adjustment housing surrounding the base housing. Such vane pumps are for example from the DE 102 40 409 A1 , of the EP 2 735 740 A1 or the US 2009/0291008 A1 previously known.

Such vane pumps are used in particular in motor vehicles in the form of oil pressure pumps for engine or transmission oil use. The pumps, or their rotors, are driven by an engine, in particular an internal combustion engine, in particular by its camshaft.

Vane pumps generally have a crescent-shaped pressure chamber, which is divided by the at least one wing in pressure chambers. By rotation of the rotor, which is arranged eccentrically to the inner wall of the adjustment, a pressure gradient between a suction inlet and a pressure outlet can be provided.

The above-mentioned vane pump is adjustable or variable; by adjusting the adjustment, the size of the crescent-shaped pressure chamber can be adjusted; this also changes the pumping characteristics. As required, therefore, the performance of the vane pump can be adjusted.

In such vane pumps must be ensured on the one hand that the vane pump has a dense construction as possible; In particular, the basic housing must rest tightly against the contact surfaces. In addition, it must be ensured that the adjustment housing and the rotor between the contact surfaces can be moved reliably. Further, due to the installation situation of the vane pumps, it is desirable that the suction inlet and the pressure outlet can be brought from the same direction to the vane pump.

The present invention is based on the object of developing a vane pump mentioned above in such a way that it meets the requirements mentioned.

This is achieved by a vane pump with the features of claim 1. Such a vane pump therefore provides that a suction inlet and a pressure outlet are provided in the housing bottom, wherein the axial extent of the base housing is greater than the axial extent of the adjustment of the rotor and / or the at least one wing. Due to the fact that the axial extension of the base housing is at least slightly larger than the axial extent of the movable components present in the housing, it is possible to ensure that the two end faces of the base housing reliably come into contact with the two contact surfaces and, on the other hand, the movable components, ie the adjustment housing, the rotor and the at least one wing, can be moved freely in the housing, even if due to the prevailing in the region of the suction inlet in the housing vacuum, the second, in particular lower contact surface is acted upon towards the first, in particular upper contact surface. In this case, due to the installation position, the housing bottom can be acted upon towards the first contact surface. It can thus be provided in the axial direction, a defined gap between the contact surfaces and the contact surfaces facing end faces of the movable components; a jamming or wedging of these components between the two contact surfaces is thus avoided. The axial extent is the extent of the respective components in the axial direction between the two contact surfaces.

Due to the at least slightly larger axial extent of the base housing than the other movable components in the housing, the suction inlet and the pressure outlet are provided according to the invention in the housing base on the one hand. However, due to the design of the pump, although the suction inlet is provided in the housing bottom, it can not lead to unwanted jamming or wedging of the movable components within the housing.

Overall, therefore, not only the pressure outlet, but also the suction inlet of particular axially down to the pump, are passed through the housing bottom in the axial direction, while still ensuring that the pump operates reliable.

It is also advantageous if the axial extension of the adjusting housing, the rotor and the at least one wing, ie the extension of the components in the axial direction between the two contact surfaces, is the same.

Furthermore, it is advantageous if the axial extent of the base housing in the range of 1/1000 mm to 1/100 mm and preferably in the range of 5/1000 mm to 5/100 mm is greater than the axial extent of the adjusting housing, the rotor and / or at least a grand piano. Thereby, a defined axial gap between the end faces of the adjusting housing, the rotor, the at least one wing and the two contact surfaces can be provided.

Preferably, the adjusting housing, the rotor and the at least one wing is made of the same material. The material is in particular metal and preferably steel into consideration. This ensures that the thermal expansion of the adjustment, the rotor and the wings are the same or at least largely the same.

The first, in particular upper contact surface may be formed by a housing cover, which may be firmly connected in total to the base housing.

In order to separate the suction inlet and the pressure outlet, a molded seal, which surrounds the suction inlet and / or the pressure outlet, is provided on the housing bottom, on the side facing away from the rotor, according to the invention. Thereby, a separation of inlet and outlet can be provided.

The rotor is advantageously driven by a rotor shaft which passes through the housing bottom and is rotatably mounted by means of a thrust washer on a bearing bush provided on the housing bottom, in which case the molded seal encloses in particular in addition to the suction inlet and the region of the bearing bush. The bearing bush can also be formed integrally with the housing bottom. Preferably, the area of the bearing bush is assigned to the sowing area.

Further, in addition to the basic housing according to the invention a the basic housing (in the radial direction) surrounding the outer housing is provided, wherein the outer housing projects beyond the base housing in the axial direction and the housing bottom is at least partially enclosed by the outer housing. As a result, an encapsulation of the base housing and the bottom can be provided. In addition, according to the invention further sealing elements, in particular in the form of circumferential sealing rings for further sealing, are provided between the outer housing and the base housing and / or the housing bottom. The housing bottom according to the invention has on its radially outer side a circumferential seal for sealing engagement with a vane pump receiving receptacle. Accordingly, it is conceivable that the outer housing also includes such seals.

• 1 eine Unteransicht einer Flügelzellenpumpe;
• 2 einen Längsschnitt durch die Pumpe gemäß 1 entlang der Linie II;
• 3 einen Längsschnitt durch die Pumpe gemäß 1 entlang der Linie III;
• 4 einen Schnitt durch die Pumpe gemäß 3 entlang der Linie IV und
• 5 die Pumpe im Schnitt gemäß 2 in einer Einbausituation.

The invention will be described in more detail with reference to the following description and the accompanying figures. Show it:

• 1 a bottom view of a vane pump;
• 2 a longitudinal section through the pump according to 1 along the line II ;
• 3 a longitudinal section through the pump according to 1 along the line III ;
• 4 a section through the pump according to 3 along the line IV and
• 5 the pump in section according to 2 in a mounting situation.

In the figures is an adjustable vane pump 10 as shown in the sections 2 and 3 becomes clear, a multi-part housing 12 includes a pump room 14 encloses. In the pump room 14 is one around a rotor axis 16 rotatably mounted rotor 18 intended. For rotation of the rotor 18 this is by means of a rotor shaft 20 rotationally coupled. The rotor 18 serves to entrain slidably mounted in the rotor in the radial direction wings 22 especially in 4 are clearly visible.

In the axial direction, ie in the direction of the rotor axis 16 becomes the pump room 14 from a first, upper contact surface 24 and of a parallel formed, second and lower contact surface 26 limited. The upper contact surface 24 is doing of a housing cover 28 educated; the lower contact surface 26 is from a caseback 30 educated.

In the radial direction, ie transverse to the rotor axis 16 , the pump room becomes 14 from an adjustment housing 32 limited. As in particular from 4 becomes clear, are the radially outer wing tips of the wings 22 on the inner wall of the adjustment 32 at. The rotor 18 is eccentric in the pump room 14 arranged. Between the rotor 18 and the inner wall of the adjustment 32 there is a crescent-shaped pressure chamber 42 from the single wing 22 is divided into pressure chambers. Upon rotation of the rotor 18 arises in the crescent-shaped pressure chamber 42 a pressure gradient.

The adjustment housing 32 as such, as well as in 4 is shown, in the direction of the arrow 34 transverse to the rotor axis 16 be adjusted. The adjustment housing 32 is by adjusting springs 36 pushed into a basic position. The adjustment housing 32 limited radially outward lying two pressure chambers 38 and 40 , in the 4 are clearly visible. When pressurizing the pressure chamber 40 with a pressure medium is the adjustment 32 against the force of the adjusting springs 36 in 4 moved to the left. By adjusting the adjustment 32 in the direction of the arrow 34 changes eccentric position of the rotor 18 within the adjustment housing 32 and thus the size of the crescent-shaped pressure chamber 42 ; Accordingly, the flow rate of the pump changes.

The adjustment housing 32 is in the radial direction of a basic housing 44 enclosed.

As in particular in 2 and 3 becomes clear, are the basic housing 44 , the adjustment housing 32 as well as the rotor 18 with the wings 22 seen in the axial direction between the two contact surfaces 24 and 26 , Out 2 It also becomes clear that in the case back 30 on the one hand a suction inlet 46 as well as one spatially separate pressure outlet 48 are provided. The pressure inlet 46 and the pressure outlet 48 extend in the axial direction through the housing bottom 30 in the pressure room 42 , Upon rotation of the rotor 18 is therefore via the suction inlet 48 the fluid, in particular gear or engine oil, sucked in and over the pressure outlet 48 from the pump 10 promoted.

To ensure reliable rotation of the rotor 18 including wings 22 in the pump room 14 to ensure, and also to adjust the adjustment 32 To ensure reliable operation, it is provided that the axial extent A of the basic housing 44 is slightly larger than the axial extent of the adjustment 32 as well as the rotor 18 including wings 22 , Advantageously, the axial extent of the base housing in the region between the two contact surfaces 24 and 26 in the range of 5/1000 mm to 5/100 mm larger than the axial extent of the adjustment housing 32 and the rotor 18 with wings 22 , It can thereby be achieved that, in particular during operation of the pump, sufficient play in the axial direction between the parts which are movable in the pump, that is to say the adjusting housing 32 , and the rotor 18 including wings 22 and the contact surfaces 24 . 26 is available. In this respect, so can the pump 10 be operated safely.

Advantageously, the axial extent between the contact surfaces 24 . 26 of the adjustment housing 32 , the rotor 18 and the wings 22 same size; that is, the components have an identical height dimension. The components mentioned are preferably also made of the same or a similar material, so that their thermal expansion behavior is largely the same.

For radial guidance of the wings 22 are around the rotor shaft 20 two inner rings 72 provided, with an inner ring 72 at the upper contact surface 24 and an inner ring 72 at the lower contact surface 26 is applied.

As in particular from 1 becomes clear, is the suction inlet 46 from one on the case back 30 arranged circumferential mold seal 50 surround. The molded seal 50 is there, as in particular from 2 and 3 becomes clear, in the axial direction in sections, and in particular in half, in the housing bottom 30 admitted,

Due to the molded seal 50 thus becomes the area of the pressure outlet 48 from the area of the suction inlet 46 separated.

Nevertheless, suction intake are 46 and pressure outlet 48 both side by side at the bottom of the pump 10 intended.

Like from the 3 and 4 becomes clear, the basic housing becomes 44 from an outer casing 52 surround. The outer housing 52 projects beyond the basic housing in the axial direction 44 so that the case bottom 30 About half of the outer casing 52 is covered. The caseback 30 has a rising in the radial direction annular collar 54 on that with the outer surface of the outer casing 52 essentially flush. In the area of the ring collar 54 is a circumferential sealing ring 56 intended.

For sealing the outer housing 52 opposite the case back 30 is on the case back 30 also a circumferential sealing ring 58 intended.

For positionally accurate arrangement of the basic housing 32 at the bottom of the case 30 are extending in the axial direction dowel pins 60 intended. The basic housing 52 can via connecting screws 62 to the housing cover 28 be flanged.

Like also from the 2 and 3 becomes clear, passes through the rotor shaft 20 the housing cover 28 , The rotor shaft 20 can about their free end 64 be set in rotation. The rotor shaft 20 is also with the rotor 18 rotationally coupled. The rotor shaft 20 is also one on the rotor shaft 20 by means of a screw 66 attached thrust washer 68 and one on the case back 30 provided bearing bush 70 at the bottom of the case 30 rotatably mounted.

In the 5 is the one in the 1 to 4 illustrated pump 10 shown in a mounting situation. That with the ring collar 54 of the case bottom 30 flush-fitting outer housing 52 is in a cylindrical receptacle 74 introduced. About the sealing ring 56 finds a seal between the case back 30 and the recording 74 instead of.

In the area of the bottom of the picture 74 is a way to the ground 30 open channel 76 provided by a perimeter wall 78 is delimited. The case back 30 facing top of the channel 76 lies close to the molded seal 50 at. This will become the channel 76 close to the suction inlet 46 the pump 10 connected under tension. The bias can, for example, via the seal 50 or be provided via a spring element to be provided. The in the case bottom 30 provided pressure outlet 48 opens into a pressure channel 80 that goes along the outside of the wall 78 of the canal 76 runs. About the pressure channel 80 can that from the pump 10 subsidized medium are supplied to the respective consumer. How out 5 becomes clear, can on such an arrangement, the suction side and the pressure side of the pump 10 be brought from axially down to the pump. The axial extent of the outer housing 52 is chosen so that in the mounted state, a slight axial gap between the annular collar 54 and the ring collar 54 facing end face of the outer housing 52 is provided. Thus come the two mutually applied end faces of the basic housing 44 at the two contact surfaces 24 . 26 sealing to the plant.

As the pump pressure increases, so does the pressure in the pressure channel 80 , Out 5 also becomes clear that the case bottom 30 then stronger against the basic housing 44 and the basic housing 44 against the housing cover 28 is charged. Nevertheless, it comes because of the greater axial extent of the basic housing 44 as the adjustment housing 32 , the rotor 18 and the wing 22 no jamming of these moving components within the housing 12 , The pump 10 works reliably.

Claims (7)

Adjustable vane pump (10), in particular oil pressure pump, with a cup-shaped housing (12) and with a rotor (18) rotatably mounted in the housing (12) about a rotor axis (16) and carrying at least one vane (22) movably mounted in the radial direction, wherein the housing (12) transversely to the rotor axis (16) comprises a first stop surface (24) and a second stop surface (26) for the rotor (18) including vanes (22), wherein the second stop surface (26) of a housing bottom (30 ) is formed, wherein the housing (12) between the run-on surfaces (24, 26) arranged, the rotor (18) including wings (22) enclosing and transverse to the rotor axis (18) adjustable adjusting housing (32) and the adjusting housing (32 ) and the axial extent (A) of the base housing (44) is greater than the axial extension (A) of the adjusting housing (32), the rotor (18) and / or the at least one wing (22), characterized in that i A suction inlet (46) and a pressure outlet (48) are provided in the housing bottom (30), wherein the suction inlet (46) is surrounded by a molded seal (50) provided on the housing bottom (30) such that an upper side facing the housing bottom (30) an intended channel (76) can be applied under prestressing close to the molded seal in order to connect the suction inlet (46) tightly to the channel (76), wherein an outer housing (52) surrounding the main housing (44) is provided, wherein the outer housing ( 52) in the axial direction of the base housing (44) projects beyond and the housing bottom (30) at least partially surrounded by the outer housing (52), wherein for sealing the outer housing (52) relative to the housing bottom (30) on the housing bottom (30) has a circumferential sealing ring (30). 58), wherein the housing bottom (30) has an annular collar (54) which terminates substantially flush with an outer surface of the outer housing, and wherein in the region of the annular collar (54) a circumferential sealing ring (56) for sealing engagement with a vane pump (10) receiving receptacle (74) is provided. Vane pump (10) after Claim 1 , characterized in that the axial extension (A) of the adjusting housing (32), the rotor (18) and the at least one wing (22) is the same size. Vane pump (10) after Claim 1 or 2 , characterized in that the axial extent (A) of the base housing (44) in the range of 1/1000 mm to 1/100 mm and preferably in the range of 5/1000 mm to 5/100 mm is greater than the axial extent (A) of Adjustment housing (32), the rotor (18) and / or the at least one wing (22). Vane pump (10) after Claim 1 . 2 or 3 , characterized in that the adjusting housing (32), the rotor (18) and the at least one wing (22) are made of the same material and / or have the same thermal expansion behavior. Vane pump (10) according to one of the preceding claims, characterized in that the first contact surface (24) by a housing cover (28) is formed. Vane pump (10) according to one of the preceding claims, characterized in that a rotor shaft (20) driving the rotor (18) is provided, which passes through the housing bottom (30) and which by means of a thrust washer (68) on one of the housing bottom (30). provided bearing bush (70) is rotatably mounted, wherein the molded seal (50) and the region of the bearing bush (70) encloses. A system comprising a vane pump (10) according to any one of the preceding claims and a cylindrical receptacle, wherein the vane pump (10) is disposed in the receptacle (74), wherein a top of a channel (76) facing the housing bottom (30) is prestressed is applied to the molded gasket so that the suction inlet (46) is sealed to the channel (76), the pressure outlet (48) surrounding the channel (76) along the outside of a wall (78) of the channel (76). extending pressure channel (80) opens, such that with increasing pump pressure, the pressure in the pressure channel (80) increases and thus the housing bottom (30) against the base housing (44) and the base housing (44) against the housing cover (28) is acted upon a seal between the housing bottom (30) and the receptacle (74) takes place via the sealing ring (56).

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