US 11,939,896 B2
Blowby gas return apparatus and head cover
Takashi Kashiwabara, Hiroshima (JP); and Yuki Tsukagoshi, Hiroshima (JP)
Assigned to MAZDA MOTOR CORPORATION, Hiroshima (JP)
Filed by MAZDA MOTOR CORPORATION, Hiroshima (JP)
Filed on Mar. 21, 2023, as Appl. No. 18/187,348.
Claims priority of application No. 2022-074274 (JP), filed on Apr. 28, 2022.
Prior Publication US 2023/0349307 A1, Nov. 2, 2023
Int. Cl. F01M 13/04 (2006.01)
CPC F01M 13/0416 (2013.01) 13 Claims
OG exemplary drawing
 
1. A blowby gas return apparatus that returns blowby gas generated in an engine having a plurality of cylinders to an intake system of the engine, the blowby gas return apparatus comprising:
a distribution portion that is provided inside a head cover of the engine and distributes the blowby gas to intake paths of the cylinders,
a communication passage that allows an intake port constituting the intake path of the cylinder and an outlet of the branch passage to communicate with each other inside a cylinder head of the engine, and
a lubricating oil passage that is disposed adjacent to the distribution portion and through which lubricating oil supplied to a valve system of the engine flows,
wherein the distribution portion includes an introduction portion through which the blowby gas is introduced and a plurality of branch passages communicating with the introduction portion, the plurality of branch passages branching from the introduction portion to communicate with the intake paths.