US 7,540,274 B2
High pressure fuel supply pump for internal combustion engine
Hiroyuki Yamada, Hitachinaka (Japan); Shigenori Tahara, Hitachinaka (Japan); Atsuji Saito, Hitachinaka (Japan); Yukio Takahashi, Hitachinaka (Japan); and Masami Abe, Hitachi (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan); and Hitachi Car Engineering Co., Ltd., Hitachinaka-shi (Japan)
Filed on Aug. 20, 2003, as Appl. No. 10/643,925.
Application 10/643925 is a continuation of application No. 09/463659, filed on Jan. 28, 2000, granted, now 6,631,706.
Claims priority of application No. 11-31619 (JP), filed on Feb. 09, 1999; application No. 11-129903 (JP), filed on May 11, 1999; and application No. PCT/JP99/03257 (JP), filed on Jun. 18, 1999.
Prior Publication US 2004/0055580 A1, Mar. 25, 2004
Int. Cl. F02M 37/04 (2006.01); F02M 37/06 (2006.01)
U.S. Cl. 123—506  [123/496] 23 Claims
OG exemplary drawing
 
1. A high pressure fuel supply pump, comprising an electromagnetic mechanism having a plunger biased to a jump-out position by a spring, an electromagnetic solenoid for operating said plunger to a withdrawn position, an intake check valve provided in a fuel inlet of a pressurizing chamber of a pump, said electromagnetic mechanism being unenergized and mounted integral with the pump body so that, when said plunger is at the jump-out position, said electromagnetic mechanism comes in contact with said check valve to move said check valve to an opening position and, when said electromagnetic mechanism is energized and said plunger is at the withdrawn position, said electromagnetic mechanism moves away from said check valve to operate said check valve to a closed position, a guide member having a first stopper surface, a fixed stopper with a second stopper surface and a movable stopper being operatively associated with said electromagnetic mechanism so as to be movable between said first and second stopper surfaces by a stroke Ss wherein with said electromagnetic device being unenergized a ball member associated with said member stopper protrudes from the guide member by an amount Sg less than the length of the stroke Ss and the movable stopper and said movable is in contact with said first stopper surface, and with energization of said electromagnetic drive device, said ball member is moved within said guide member less than said amount Sg so as to close said intake check valves whereby fuel in said pressurizing chamber is dammed up by said valve body when a force of a second spring does not act on said valve body and is discharged downstream of an opened discharge valve provided at said pressurizing chamber.