Ventilation structure of internal combustion engine

Abstract

The present invention provides a ventilation structure of an internal combustion engine, which can reduce the cost and prevent the overall increase of the internal combustion engine by using an insertion hole through which a clutch release shaft is inserted as a ventilation passage. It is such a ventilation structure that the clutch release shaft (39) is inserted through the insertion hole (60b), and the insertion hole (60b) is radially from the central part (P) toward the peripheral part (Q) in the clutch cover ( 7) is formed by perforating the outer wall (7v) of the cover. In the ventilation structure of the internal combustion engine, a ventilation opening to the transmission chamber (2M) side is formed near the central part (P) of the insertion hole (60b). The introduction port (60a) pierces the outer peripheral wall (7s) of the cover and the crankcase (2) from the peripheral part (Q) of the insertion hole (60b) to form a gap with the upper rear space in the crankcase (2). The ventilation channels (60c, 60d) communicated with the ventilation chamber (61).

Description

technical field [0001] The present invention relates to ventilation structures for blowby gas treatment in internal combustion engines. Background technique [0002] Conventionally, a venting structure has been proposed in which the blow-by gas in the crankcase is involved in the swirling flow generated by the rotation of the outer rotor part of the AC generator that rotates integrally with the crankshaft, and the oil is separated by centrifugal force. , the blow-by gas remaining in the center is introduced into the breather chamber through the breather passage formed in the crankcase cover (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 9-53436 [0004] In the ventilation structure disclosed in Patent Document 1, the crankcase cover (ACG cover) covering the AC generator provided at the end of the crankshaft from the outside consists of a side wall facing the AC generator in the axial direction and covering th...

AI Technical Summary

Problems solved by technology

[0005] In particular, when a blow-by gas treatment special vent passage is to be formed on the side wall of the crankcase cover, a clutch release shaft for controlling the operation of the clutch from the outside is installed on the clutch cover as the crankcase cover. , if the ventilation passage and the clutch release shaft are to be arranged on one crankcase cover, the structure becomes complicated and not easy to process

[0006] Therefore, when forming such a structure that the air passage is provided on the ACG cover side and the clutch release shaft is left on the clutch cover side as in Patent Document 1, both crankcase covers must be processed and molded separately for arrangement, resulting in Rising costs and resulting in an overall larger internal combustion engine

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