초록 ▼

The invention relates to a piston pump for a vehicle brake system, in particular an electrohydraulic vehicle brake system. To improve the aspiration performance of the piston pump when the brake fluid is viscous at low the invention proposes a valve opening device, which compulsorily opens the inlet

The invention relates to a piston pump for a vehicle brake system, in particular an electrohydraulic vehicle brake system. To improve the aspiration performance of the piston pump when the brake fluid is viscous at low the invention proposes a valve opening device, which compulsorily opens the inlet valve, embodied as a spring-loaded check valve, of the piston pump at the onset of a return stroke of the piston. The valve opening device has an opener pin, which is mounted on a valve ball of the inlet valve, and which at the end of a supply stroke of the piston enters a perforated, disklike valve opener part. At the onset of the return stroke, the valve opener part restrains the valve ball by frictional force at its opener pin and thereby opens the inlet valve.

대표청구항 ▼

1. A piston pump (10), having a piston (20) which is axially displaceably received in a pump housing (16) and which can be driven to execute a reciprocating stroke motion that includes a supply stroke and a return stroke, and having an inlet check valve (38) which is mounted on the piston (20), wher

1. A piston pump (10), having a piston (20) which is axially displaceably received in a pump housing (16) and which can be driven to execute a reciprocating stroke motion that includes a supply stroke and a return stroke, and having an inlet check valve (38) which is mounted on the piston (20), wherein the piston pump (10) has a valve opening device (56, 62), which opens the inlet check valve (38) at the onset of the return stroke of the piston (20), and that the inlet check valve (38) has a valve closing body (42), and a valve stroke limiter (74), which valve stroke limiter limits an opening stroke of the valve closing body (42) of the inlet check valve (38) to a predetermined length, which valve stroke limiter slaves the valve closing body (42) of the inlet check valve (38) to the piston (20) during the return stroke of the piston (20), the valve closing body having been lifted from a valve seat (40) of the inlet check valve (38) by the predetermined length during the onset of the opening stroke.