公开(公告)号：JPH06200758A

公开(公告)日：1994-07-19

申请号：JP180993

申请日：1993-01-08

Applicant: MAZDA MOTOR

Inventor： WAKITA YUJI ,  TAJI MASAHIRO ,  NAKAMOTO TOSHIAKI ,  TOUGEDA KIYOSHI

IPC: F01P3/02 ,  F01P5/10

Abstract: PURPOSE:To improve the cooling efficiency by providing a projection arranged to cover the peripheral edge of an impeller from the terminal end of a guide groove toward the front position of a guide port in the rotation direction of the impeller, and forming the projection to squeeze the interval with a cylinder liner at the end section of a cylinder train toward the upper end side. CONSTITUTION:A projection 13 covering the peripheral edge of an impeller 4 is arranged in the nearly vertical direction from the terminal end of a guide groove 10 toward the front position of a guide port 6 in the rotation direction of the impeller 4 at the portion around the impeller 4 on the end section of a cylinder block 1. The upper end side portion of the projection 13 is extended toward a communicating hole 9 located at the upper position of the impeller 4, and its lower end side portion is extended downward along the guide port 6 respectively. The water stream of the impeller 4 is prevented by the projection 13 from interfering with the cooling water flowing toward the communicating hole 9 at the position near the impeller 4 after circulating around a block side water jacket 3, and the cooling efficiency for the combustion chamber of the impeller 4 side cylinder is improved.