Pump

Details Pump Pump

1995-08-25

1999-08-31

Freay, Charles G.

Pumps

Expansible chamber type

Including valve assembly, disassembly, or inspection...

417569, 417 63, 137512, 2989013, F04B 3900

Patent

active

059444983

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a pump, in particular a pump for the pressure fluid supply in hydraulic brake systems with slip control.


BACKGROUND OF THE INVENTION

DE 37 42 824 A1 discloses a pump having a pump piston which is guided in a bushing within the pump housing. Remote from the pump piston and the compression chamber, the bushing accommodates the valve seat for the pressure valve. The suction valve is arranged within the compression chamber at the pump piston and is connected to a pressure fluid source through a piston-side supply channel. The pressure valve is arranged in a retaining member which is secured to the bushing by way of indentations. The bushing also includes the valve seat for accommodating the pressure valve. It is disadvantageous that the retaining member along with the bushing, as a preassembled unit, can be checked and configured only outside the pump housing which, among others, impairs the interchangeability of the individual parts.
Therefore, an object of the present invention is to improve a pump of the previously mentioned type so that a construction as simple and compact as possible is achieved. Another object of the present invention is to have a pump construction such that leakage test of the pressure valve is permitted both outside and inside the pump housing, and, if replacement is necessary, ease of such replacement of individual parts, such as replacement of the pressure valve or the valve seat member, is ensured if leakage occurs during testing.
This object is achieved according to the present invention in that the peripheral surface of the valve seat member facing the cover has a conical chamfer onto which an annular projection of the cover is movable into sealing abutment and is radially expandable to provide a press fit engagement.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal semi-section of a pump shown in a partial view to explain the assembly of the valve and the cover during the function and leakage test.
FIG. 2 is the end position of the assembly elements shown in FIG. 1 after completion.
FIG. 3 is a second embodiment of the cover and the valve seat shown in FIGS. 1 and 2.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows a coaxial series connection of suction valve 10 and pressure valve 5 within the pump cylinder and, thus, within pump housing 8. Suction valve 10 is urged in the direction of the valve seat arranged on pump piston 12 under the action of a pressure spring 11. Another pressure spring 13 within the compression chamber 6, which is arranged in parallel to the first compression spring, contacts the end surface of pump piston 12 for resetting of the piston. Both pressure springs 11, 13, with their opposed coil ends, are supported on a valve seat member 2 which, under the action of pressure force of a cover 1 provided as a pressure valve supporting member, is pressed with its sealing edge 14 against bore step 7 of the pump cylinder. The pressure force Fp introduced for the leakage test of the pressure valve 5 is transmitted to a conical chamfer 3 of valve seat member 2 by way of a projection 4 which annularly extends along the periphery of the cover 1. In the assembly position of cover 1 in relation of the valve seat member 2, as shown in the drawing, the pressure valve 5 acted upon by a pressure spring 15 isolates already the compression chamber 6 from port 16 of the pressure fluid consumer. In this arrangement, initially, an axial clearance "s" remains between the end surfaces of the cover 1 and the valve seat member 2 in order to be able to attach the cover 1 in the pump housing 8 in the further course of the assembly. In the illustrated position of the cover, first, an undercut 9 acts as an annularly extending sealing edge 14 at the outside area of the cover 1 to prevent leakage to the atmosphere during the introduction of the test pressure through port 16.
FIG. 2 shows the cover 1 and the valve seat member 2 in their end position after the assembly force Fm has been applied. The magnitude of

REFERENCES:
patent: 3055086 (1962-09-01), Hoganson
patent: 5112196 (1992-05-01), Schuh
patent: 5626326 (1997-05-01), Goossens et al.

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