Apparatus for damping pressure fluctuations
First Claim
1. An apparatus (36) for damping pressure fluctuations in a hydraulic vehicle brake system (10) comprising at least a single-circuit master brake cylinder (11) for generating brake pressure in at least one wheel brake (14), a pressure control valve assembly (26) between the master brake cylinder and the wheel brake, a pump (29) for drawing pressure fluid out of the wheel brake to avoid wheel locking during braking, wherein the pump is connected by its outlet (30) to the master brake cylinder, via a damper chamber (32) and a throttle (34) with a pressure limiting valve (33) having a spring-loaded, cylindrically embodied closing element (52) disposed to bypass the throttle, further in which the throttle (34) and the pressure limiting valve (33) have a common sleevelike housing (42) with a cylindrical interior and with an inflow opening (45) disposed on a housing bottom (44) of said housing (42), the cylindrically embodied closing element (52) is longitudinally movably guided in the housing (42) and on an end face of the housing (42) has a hollow collar (59) fitting over the inflow opening (45) and supported on the housing bottom (44), the collar (59) forms a closing valve with the housing bottom (44), and the collar (59) of the closing element (52) and a valve seat (60) of the housing bottom (44) forms the throttle (34), with at least one aperture (61, 61'"'"') open toward an end face of the collar.
1 Assignment
0 Petitions
Accused Products
Abstract
The vehicle brake system has a master brake cylinder to generate brake pressure in at least one wheel brake. To avoid wheel locking during braking, a pressure control valve assembly and a pump for drawing pressure fluid out of the wheel brake are disposed between the master brake cylinder and the wheel brake. With its outlet, the pump communicates with the master brake cylinder via a damper chamber and a throttle having a pressure limiting valve disposed to bypass the throttle. The throttle and the pressure limiting valve have a common sleevelike housing, in which a cylindrically embodiment closing element is guided longitudinally movably. This closing element has a hollow collar on its face end that in the closing position fits over an inflow opening for pressure fluid. The collar of the closing element, in order to form the throttle, is provided with at least one aperture open toward this face end. The pressure limiting valve, which responds if the throttle is blocked with particles, overcomes the cross-sectional limitation of the throttle, so that the throttle can be self cleaning.
71 Citations
42 Claims
- 1. An apparatus (36) for damping pressure fluctuations in a hydraulic vehicle brake system (10) comprising at least a single-circuit master brake cylinder (11) for generating brake pressure in at least one wheel brake (14), a pressure control valve assembly (26) between the master brake cylinder and the wheel brake, a pump (29) for drawing pressure fluid out of the wheel brake to avoid wheel locking during braking, wherein the pump is connected by its outlet (30) to the master brake cylinder, via a damper chamber (32) and a throttle (34) with a pressure limiting valve (33) having a spring-loaded, cylindrically embodied closing element (52) disposed to bypass the throttle, further in which the throttle (34) and the pressure limiting valve (33) have a common sleevelike housing (42) with a cylindrical interior and with an inflow opening (45) disposed on a housing bottom (44) of said housing (42), the cylindrically embodied closing element (52) is longitudinally movably guided in the housing (42) and on an end face of the housing (42) has a hollow collar (59) fitting over the inflow opening (45) and supported on the housing bottom (44), the collar (59) forms a closing valve with the housing bottom (44), and the collar (59) of the closing element (52) and a valve seat (60) of the housing bottom (44) forms the throttle (34), with at least one aperture (61, 61'"'"') open toward an end face of the collar.
- 15. An apparatus (36) for damping pressure fluctuations in a hydraulic vehicle brake system (10) comprising at least a single-circuit master brake cylinder (11) for generating brake pressure in at least one wheel brake (14), a pressure control valve assembly (26) between the master brake cylinder and the wheel brake, a pump (29) for drawing pressure fluid out of the wheel brake to avoid wheel locking during braking, wherein the pump is connected by its outlet (30) to the master brake cylinder, via a damper chamber (32) and a throttle (34) with a pressure limiting valve (33) having a spring-loaded, cylindrically embodied closing element (52) disposed to bypass the throttle, further in which the throttle (34) and the pressure limiting valve (33) have a common sleevelike housing (42) with a cylindrical interior and with an inflow opening (45) disposed on a housing bottom (44) of said housing (42), the cylindrically embodied closing element (52) is longitudinally movably guided in the housing (42) and on an end face of the housing (42) has a hollow collar (59) fitting over the inflow opening (45) and supported on the housing bottom (44), the collar (59) forms a closing valve with the housing bottom (44), and a valve seat (60) of the housing bottom (44) forms the throttle (34), with at least one aperture (61, 61'"'"') open toward an end face of the collar.
- 29. An apparatus (36) for damping pressure fluctuations in a hydraulic vehicle brake system (10) comprising at least a single-circuit master brake cylinder (11) for generating brake pressure in at least one wheel brake (14), a pressure control valve assembly (26) between the master brake cylinder and the wheel brake, a pump (29) for drawing pressure fluid out of the wheel brake to avoid wheel locking during braking, wherein the pump is connected by its outlet (30) to the master brake cylinder, via a damper chamber (32) and a throttle (34) with a pressure limiting valve (33) having a spring-loaded, cylindrically embodied closing element (52) disposed to bypass the throttle, further in which the throttle (34) and the pressure limiting valve (33) have a common sleevelike housing (42) with a cylindrical interior and with an inflow opening (45) disposed on a housing bottom (44) of said housing (42), the cylindrically embodied closing element (52) is longitudinally movably guided in the housing (42) and on an end face of the housing (42) has a hollow collar (59) fitting over the inflow opening (45) and supported on the housing bottom (44), the collar (59) forms a closing valve with the housing bottom (44), and the collar (59) of the closing element (52) forms the throttle (34), with at least one aperture (61) open toward an end face of the collar.
Specification