Pump of an electronically controlled braking system

A pump (15L,15R) of an electronically-controlled brake system including a bore (25) formed in a modulator block (18) to communicate with inlet (23) and outlet (24) ports formed in the modulator block (18), a piston (30) connected to a spindle (21) of a motor (16) arranged at one end of the bore (25), and arranged in the bore (25) such that the piston (30) reciprocates in the bore (25), and a cover (50) coupled to the other end of the bore (25) to define a compression chamber (40) between the cover (50) and an end of the piston (30) facing the cover (50). The compression chamber (40) communicates with the outlet port (24). The pump (15L,15R) further includes an outlet valve (70) to open and close the outlet port (24) to allow oil in the compression chamber (40) to be discharged from the compression chamber (40), an inlet passage (51) formed in the cover (50) to transfer oil in the inlet port (23) to the compression chamber (40), and an inlet valve (60) arranged in the compression chamber (40) at an outlet of the inlet passage (51), and fixed to the cover (50) to open and close the inlet passage. The inlet valve (60) operates in opposite to the outlet valve (70). The inlet valve (60) has a valve opening/closing member (62) to selectively come into contact with a valve seat (61) provided at the cover (50). Since the inlet valve (60) is fixed to the cover (50), the valve opening/closing member (62) can be rapidly moved away from the valve seat (61) without being restrained by the piston (30). Accordingly, the filling rate of oil in the compression chamber (40) is enhanced.