PUMP DEVICE

Abstract

Pump device comprising a pump insert, without a dedicated housing, and a receiving part, wherein the pump insert is inserted in the receiving part, wherein in the receiving part the suction passage for the pump insert is designed for sucking in a fluid, wherein in the suction passage provision is made for an insertion part for optimizing fluid guiding.

Claims

1. A pump device comprising a pump insert, without a dedicated housing, and a receiving part, wherein the pump insert is inserted into the receiving part in a housing which is in fluid communication with a suction passage of the pump insert for sucking in a fluid, wherein the receiving part the suction passage is produced without metal cutting, wherein in the suction passage provision is made at least partially for an insertion part for optimizing fluid guiding, which has the shape of a funnel which from an outside diameter, which corresponds to the inside diameter of the suction passage, widens to a diameter of the housing.

2. The pump device as claimed in claim 1, wherein the receiving part forms a receptacle for intake of a fluid.

3. The pump device as claimed in claim 1, wherein the receiving part is a transmission casing.

4. The pump device as claimed in claim 1, wherein the insertion part is produced from plastic.

5. The pump device as claimed in claim 1, wherein the insertion part is produced in a plastic injection molding process.

6. The pump device as claimed in claim 1, wherein the pump device is designed as a vane cell pump or gear pump.

7. The pump device as claimed in claim 1, wherein the pump insert has at least two spaced apart radial seals for sealing against the receiving part.

Description

DRAWINGS

[0030] 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.

[0031] FIG. 1 shows a sectional view of a pump device as known in the prior art.

[0032] FIG. 2 shows a sectional view of a pump device according to the invention.

DESCRIPTION OF THE INVENTION

[0033] Shown in FIG. 1 is a pump device 1, as known in the prior art. The pump insert itself is not shown for a better overview and is provided for installation in section A. Located in a receiving casing, for example a transmission, is a receiving part 2 in which a suction passage 3 is provided supplying a fluid, wherein the suction passage 3 is formed by metal cutting. The forming by metal cutting and therefore the very cleanly designed and machined inner surface I of the suction passage 3 enables an optimization of the fluid flow into a pump chamber of the pump insert, as a result of which sucking in of air is reduced or prevented. An injector 5 is arranged in the suction passage 3.

[0034] FIG. 2 shows a pump device 1 according to the invention in a casing, which provides a receiving part 2, formed by a sub-assembly, wherein the pump device is again shown without the pump insert. The suction passage 3 is cast in the receiving part 2 along with it. The casting process of such a casing part is significantly more cost effective, but the inner surface I is significantly rougher than in the case of production by a metal cutting method. If a transmission casing is assumed, it is advisable to already design an oil reservoir as the receptacle B during the casting.

[0035] The fluid flow would turbulently makes its way to the pump without further measures.

[0036] In order to be able to optimize the fluid flow and to design the inflow to the pump in a controlled manner, an insertion part 4, which improves the fluid flow, is inserted into the suction passage 3.

[0037] The insertion part has the shape of a funnel which from an outside diameter AD, which corresponds to the inside diameter I of the suction passage, widens to a diameter D of the housing A. The insert in the suction passage 3 is cylindrical and extends into the suction passage 3 up to a depth T. This embodiment is by way of example. The insertion part can also have the shape of a cylinder which terminates in a truncated manner in the section A, or has a cylindrical shape which is widened in an optional way, wherein the diameter D does not have to be achieved for the widening.

[0038] In a preferred embodiment variant, the fluid flow in the insertion part 4 can be split into at least two inflows by partitions being provided.

[0039] The insertion part 4 according to the invention consists of plastic and is preferably produced in an injection molding process. With this, more complex insertion parts with a plurality of structured suction passage sections are also possible.

[0040] In a further preferred embodiment, provision can be made between the insertion part 4 and the suction passage 3 for an encircling seal (not shown), for example at least one O-ring or a sealing lip injected on the insertion part 4.

[0041] If required, an injector 5 (not shown) can also be inserted in the suction passage 3.

[0042] The installation of the insertion part is carried out by the insertion part being pressed into the part of the suction passage which is open toward the section A. In an optimum case, the cast structure of the suction passage is adequate in order to securely guide and to fasten the insertion part. If necessary, however, the suction passage still has to be aftermachined so that for example a cylindricalat least in certain sectionsinsertion part 3 can easily be inserted.

LIST OF DESIGNATIONS

[0043] 1 Pump device

[0044] 2 Receiving part

[0045] 3 Suction passage

[0046] 4 Insertion part

[0047] 5 Injector

[0048] A Section

[0049] D Diameter

[0050] I Inside diameter

[0051] AD Outside diameter

[0052] T Depth

[0053] B Receptacle