PUMP AND SYSTEM FOR SUPPLYING A CONSUMER

Abstract

The invention relates to a pump, having a contour ring, having a rotor, having vanes, having side plates, having a housing and a housing cover, having under-vane grooves for supplying the lower vane faces with pressure, the vanes being arranged radially displaceably in the rotor and extending under the vanes as a result of the pressure and being pressed against the contour ring. Furthermore, the invention relates to a system for supplying oil to a consumer.

Claims

1. A pump in a housing having a cam ring which has an axial recess, a rotor which is received in the axial recess such that it can be rotated relative to the cam ring, the rotor having slots, in which vanes are received such that they can be moved in the radial direction, having a side plate which closes off the axial recess on a first side, having a pressure plate which closes off the axial recess on a second side, the pressure plate having at least one opening, and having a cold starting plate which is prestressed against the pressure plate by means of a spring element in such a way that, at least at a standstill of the pump, it closes the at least one opening in the pressure plate with respect to the external surroundings thereof, wherein the housing of the pump has a main pressure connector to the consumer, the main pressure connector being connected in the housing directly to the pressure space of the pump, and via a check valve which, installed in the housing, connects the main pressure connector to the connector for an additional pump.

2. A system for supplying oil to a consumer having a pump as claimed in claim 1 as a main pump, the connection of an additional pump taking place directly at the main pump.

3. The system as claimed in claim 2, wherein no check valve is arranged between the main pressure outlet of the pump on the housing and the consumer.

4. The system as claimed in claim 2, wherein the two check valves are formed by the cold starting plate and a check valve which is integrated into the housing.

5. The system as claimed in claim 2, wherein the main pressure outlet is the common pressure outlet of the main pump and the additional pump.

Description

DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

[0028] The invention will now be described in greater detail using the figures, in which:

[0029] FIG. 1 shows a hydraulic circuit diagram according to the invention,

[0030] FIG. 2 shows a side plate of the pump,

[0031] FIG. 3 shows a section along the rotational axis of the pump G-G, and

[0032] FIG. 4 shows sections through the pressure plate (F-F) and through the inner parts (H-H).

[0033] The solution according to the invention and the system according to the invention can be understood using FIG. 1. A pump 1 is indicated diagrammatically. It is connected to a pump inlet 11 which is connected to the suction side of the pump. On the pressure side, the pump is provided with a check valve function which is provided between the pump and a main pressure connector 8 to a consumer 6. An additional pump 14 is connected via a check valve 4 to the main pressure connector 8. According to the invention, the check valve function of the pump 1 is realized at least by way of a cold starting plate 31. The pump 1 and the two check valves are situated in a common housing 2.

[0034] As a result of the use of an existing cold starting device additionally as a check valve, no further components for sealing the main pressure connector 8 of the main pump are necessary.

[0035] FIG. 2 shows a view of the side plate 13 of the pump. The suction kidneys 40 are connected to the pressure space of the pump.

[0036] A sectional image of the pump 1 which is shown in the region of the under-vane plane F-F of the pressure plate 17 can be seen in FIG. 4. The suction kidneys 40 and the pressure kidneys 41 can be seen.

[0037] FIG. 3 shows the section along the plane G-G from FIG. 2. The pump which is otherwise of conventional construction has a housing 2 which has a plurality of connectors 18 for the inlet and outlet. The pump is delimited by side plates 13 and a working space, the side plates and the working space being combined to form a housing 2. On the right-hand side, the pump has a thickened housing part 2a which contains the bores or recesses for the main pressure connector 8 and the check valve 4 of the additional pump connector. Here, a main pressure outlet duct K1 is formed with a greater cross section than the additional pump duct K2.

[0038] The main pressure connector 8 is connected to the pressure space 16. The duct K2 and the receptacle for the pressure connector of the additional pump 15 run perpendicularly with respect to the course of said main pressure connector 8. As an example of an integrated check valve, a spring-loaded ball valve is used which consists of a ball 4a in a valve seat 4b and a spring 4d. The valve seat 4b is sealed against the housing 2 by way of an O-ring 4c.

[0039] The two bores or recesses, the ducts K1 and K2 for the main pressure connector 8, and the check valve 4 do not have to be configured perpendicularly with respect to one another. It is sufficient if the recess for the check valve 4 of the additional pump is connected directly to the main pressure connector 8, which can also be achieved via a flow duct. The main pressure connector 8 is the common pressure connector of the two pumps, which common pressure connector leads to the consumer.

[0040] The system according to the invention having a main pump and an additional pump has a simple sealing means by way of the cold starting plate during operation with the additional oil pump. Here, the spring collar of the cold starting plate seals the pressure outlet of the main pump by means of a compression spring. As a result, the leakage path through the main pump is interrupted.

[0041] The spring collar of the cold starting plate opens only when the main pump starts operating. The check valve 4 closes the additional pump pressure connector 15 in the case where only the main pump is delivering. As a result, the leakage path through the additional oil pump is interrupted.

TABLE-US-00001 List of Designations 1 Pump 2 Housing 2a Housing part 3 Cam ring 4 Check valve 4a Ball 4b Valve seat 4c O-ring 4d Spring 5 Recess 6 Consumer 7 Rotor 8 Main pressure connector 9 Slot 10 Vane 11 Pump inlet 12 Oil return line 13 Side plate 14 Additional pump 15 Pressure connector, additional pump 16 Pressure space 17 Pressure plate 18 Connector 31 Cold starting plate 33 Shaped spring 39 Under-vane groove 40 Suction kidney 41 Pressure kidney K1 Duct, main pressure outlet K2 Duct, additional pump