Piston pump for a vehicle brake system

• US 6,283,733 B1
• Filed: 10/29/1999
• Issued: 09/04/2001
• Est. Priority Date: 07/30/1997
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Weh, Andreas, Merklein, Dieter, Hellebrandt, Michael, Fritsch, Siegfried, Zitzelsberger, Ralf
• Primary Examiner(s): Walberg, Teresa
• Assistant Examiner(s): FASTOVSKY, LEONID M
• Application Number:
  US09/269,571
• Time in Patent Office: 676 Days
• Field of Search: 417/545, 417/549, 417/554, 417/454, 417/503, 303/116.4, 92/78
• US Class Current: 417/549
• CPC Class Codes: B60T 8/4031 Pump units characterised by their construction or mounting pump units in combination with valve blocks B60T8/36
• CPC Class Codes: F04B 1/0421 Cylinders
• CPC Class Codes: F04B 53/168 Mounting of cylinder liners in cylinders

Abstract

A piston pump which is intended for use in a vehicle for a hydraulic, slip-controlled braking system. To enable producing the piston pump inexpensively, a bush is made without undercuts as an upset part integrally with a bottom which has a valve seat for the outlet valve of the piston pump.

Claims

1. A piston pump comprising a piston that is driven to execute a reciprocating stroke motion and is axially displaceably received in a bush which is inserted into an installation space in a pump housing, the bush (16) being formed substantially solely by means of an upsetting operation.

2. The piston pump according to claim 1, in which the bush (16) is a cold deformed part, in particular an upset part.

3. The piston pump according to claim 1, in which the bush (16) is hardened, especially nitride-hardened.

4. The piston pump according to claim 1, in which the bush (16) has a bottom (18) integral with it.

5. The piston pump according to claim 4, in which the bottom (18) of the bush (16) has a through hole (20) and a valve seat (22).

10. The piston pump according to claim 1, in which the bush (16) has substantially no constrictions which interfere with the forming of the bush by the upsetting operation.

6. A piston pump comprising a pump housing, a piston that is driven to execute a reciprocating stroke motion and is axially displaceably received in a bush which is inserted into an installation space in said pump housing, a closure part, which is inserted into said housing sealing off an installation space, the closure part (66) is joined to the bush (16), and that the closure part (66) is held and sealed off in the installation space (14) by caulking (74).

7. The piston pump according to claim 6, in which the closure part (66) is joined to the bush (16) by a press fit.

8. The piston pump according to claim 6, in which the closure part (66) is a cold deformed upset part.

9. The piston pump according to claim 6, in which the piston pump (10) has a flow conduit (70), between the closure part (66) and the bush (16), which is formed by a groove in the closure part (66) and/or in the bush (16).

11. A piston pump comprising a piston that is driven to execute a reciprocating stroke motion and is axially displaceably received in a bush which is inserted into an installation space in a pump housing, and the bush (16) is a deformed part, in which the bush (16) has substantially no constriction which interferes with the forming of the bush by an upsetting operation.