FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINE

• Main Authors: KARL-FRIEDRICH RUESSELER, BERNHARD BONSE, WOLFGANG BRAUN
• Format: Patent
• Language: English
• Published: 14.07.1999
• Edition: 6
• Subjects: BLASTING; COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

PCT No. PCT/DE98/00217 Sec. 371 Date Dec. 4, 1998 Sec. 102(e) Date Dec. 4, 1998 PCT Filed Jan. 24, 1998 PCT Pub. No. WO98/45592 PCT Pub. Date Oct. 15, 1998A fuel injection pump for internal combustion engines, is proposed, with a distributor pump piston (6), which is supported in a housing bore (5) and on its jacket face, has a distributor groove (12), a filling groove (18), which is connected to a pressure relief chamber, and a pressure compensation surface (36). This filling groove constitutes a first leakage route (39) in the direction of the distributor groove (12) and constitutes a second leakage route (42) in the direction of an annular groove (20) in such a way that the pressure compensation surface, which is otherwise always closed by the inner wall of the bore (5), produces a high-pressure fuel supply by way of the first leakage route (39) in the direction of the pressure compensation surface (36) and this pressure compensation surface (36) is in turn relieved by way of the second leakage route (42) in the direction of the annular groove (20). The disposition of the pressure compensation surface (36) diametrically opposite the distributor groove (12) results in a very favorable compensation of the forces acting on the distributor pump piston during the high-pressure delivery phase, wherein by way of the pressure supply by means of the leakage routes mentioned, these compensating forces can be brought into line with the respective pressure level and the loading of the distributor pump piston (FIG. 4).