Engine gas-liquid separation device

Abstract

A bearing housing (66) is fixed facing the opening (11k) of the engine case (11), and the bearing housing includes a bearing (67) that rotatably supports the crankshaft (14), and the cover member covering the opening (11k) The gas-liquid separation chamber (83) is formed between (68) and the bearing housing (66), so the bearing housing (66) can be used as a part of the wall surface of the gas-liquid separation chamber (83) without increasing the number of parts , and can divide the gas-liquid separation chamber (83) without forming a special wall surface on the engine box (11), and realize the miniaturization, light weight, simplification of shape of the engine box (11) and the cost caused by the reduction of the number of parts decline. In addition, the labyrinth structure (82) is formed by the ribs (66d, 66e, 68a, 68b) protruding from the bearing housing (66) and the cover member (68), so the gas-liquid separation can be effectively performed through the labyrinth structure (82). In this manner, it is possible to provide a gas-liquid separation device for an engine that is small, lightweight, and has a small number of parts.

Description

technical field [0001] The present invention relates to a gas-liquid separation device for an engine for separating oil mist from the air in the engine case. Background technique [0002] Disclosed in the following patent document 1 is such a technology: the installation seats of the breather case (breather case) of the breather device with the gas-liquid separation function are respectively arranged on the top wall and the peripheral wall of the crankcase of the engine, and according to the use of the engine The form installs the breather box on the one of the two mounts where oil droplets are less likely to adhere. [0003] Patent Document 1: Japanese Publication No. 62-12820 [0004] However, in the prior art described above, the breather chamber is divided by the concave wall surface formed on the crankcase and the breather box installed on the mounting base, so there is a problem that the breather box protrudes from the surface of the crankcase to increase the size of ...

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Problems solved by technology

[0004] However, in the prior art described above, the breather chamber is divided by the concave wall surface formed on the crankcase and the breather box installed on the mounting base, so there is a problem that the breather box protrudes from the surface of the crankcase to increase the size of the engine, and There is also a problem that the shape of the crankcase is complicated because a concave wall surface that partitions a part of the breather chamber is formed inside the crankcase.

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