Engine blowby gas treatment device

Abstract

A blow-by gas treatment device for an engine configured such that the upper end of a portion of a passage for introducing fresh air and discharging blow-by gas vertically faces an opening section, the portion being located further toward the crank chamber side than a first breather chamber, and also such that a communication section communicating with the space within a variable valve chamber is provided between the upper end and the opening section. The area of the communication of the communication section is set so that the amount of increase in the pressure within the variable valve chamber relative to the pressure within the first breather chamber does not exceed a predetermined value when blow-by gas flows to the air intake passage not only from a passage dedicated for discharging blow-by gas but also from the passage for introducing fresh air and discharging blow-by gas.

Description

technical field [0001] The invention relates to an engine blow-by gas processing device, in particular to an engine blow-by gas processing device capable of fully performing gas exchange between new gas and blow-by gas in a crankcase. Background technique [0002] Figure 6 A schematic diagram showing a conventional engine is shown in Figure 6 In the engine 101, a cylinder head 103 is installed on the upper part of the cylinder block 102, and the cylinder head 103 is pivotally supported by an intake camshaft 104 and an exhaust camshaft 105, and a cylinder head cover 106 is installed on the cylinder head 103. A valve chamber 107 is formed inside the cylinder head 103 , and a crankshaft 108 is pivotally supported and an oil pan 109 is attached to a lower portion of the cylinder block 102 , and a crankcase 110 is formed inside the cylinder block 102 . In engine 101 , throttle valve 114 is provided in intake passage 113 from air cleaner 111 to combustion chamber 112 . [0003]...

AI Technical Summary

Problems solved by technology

Therefore, the lubricating oil that flows into the intake passage 113 together with the blow-by gas from the first breather chamber 117 and disappears increases, and there is a possibility that the throttle valve 114 and the air cleaner 111 are contaminated with lubricating oil.

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