Blow-by gas device of supercharger-equipped engine
AssigneeMazda Motor Corporation
InventorsRyotaro Nishida, Tsuyoshi Goto, Mitsutaka Yamaya
Life of this patent
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Abstract
A blow-by gas device of a supercharger-equipped engine includes a blow-by gas passage that introduces blow-by gas into an intake passage via a positive crankcase ventilation (PCV) valve. A supercharger has a supercharger rotor provided integrally with a rotation shaft rotatably supported on a bearing part. A space communicating with the bearing part is connected to a communication passage. The communication passage guides the blow-by gas into the space.
Claims8
A blow-by gas device of a supercharger-equipped engine, the blow-by gas device comprising:
- a supercharger disposed in a portion downstream of a throttle valve in an intake passage;
- a positive crankcase ventilation (PCV) valve;
- and
- a blow-by gas passage connected to a portion of the intake passage located between the throttle valve and the supercharger and to an engine body, the blow-by gas passage introducing blow-by gas discharged from the engine body into the intake passage via the PCV valve, wherein
- the supercharger includes:
- a supercharger body including therein a rotor chamber,
- a rotation shaft rotatably supported on a bearing part communicating with the rotor chamber, the rotation shaft being rotatable by power of a driving source, and
- a supercharger rotor provided integrally with the rotation shaft and rotatably disposed inside the rotor chamber,
- the supercharger body includes a space communicating with the bearing part,
- the space is connected to a communication passage branching off from a portion downstream of the PCV valve in the blow-by gas passage,
- the supercharger body includes a sealing member disposed between the bearing part and the rotor chamber,
- the space is an annular space adjacent to the sealing member and formed around the rotation shaft,
- the bearing part is located on a discharge side of the supercharger, and
- the space is defined between the sealing member and a second sealing member facing the sealing member.
A blow-by gas device of a supercharger-equipped engine, the blow-by gas device comprising:
- a supercharger disposed at a portion downstream of a throttle valve in an intake passage;
- a positive crankcase ventilation (PCV) valve;
- and
- a blow-by gas passage connected to a portion of the intake passage located between the throttle valve and the supercharger and to an engine body, the blow-by gas passage introducing blow-by gas discharged from the engine body into the intake passage via the PCV valve, wherein
- the supercharger includes:
- a supercharger body including therein a rotor chamber,
- a pair of bearing parts that are installed respectively on an intake side and a discharge side of the supercharger,
- a rotation shaft rotatably supported on the pair of bearing parts, the rotation shaft being rotatable by power of a driving source, and
- a supercharger rotor provided integrally with the rotation shaft and rotatably disposed inside the rotor chamber,
- the supercharger body includes:
- an intake-side space communicating with the bearing part on the intake side, and
- a discharge-side space communicating with the bearing part on the discharge side,
- the intake-side space is connected to a first communication passage communicating with a portion upstream of the PCV valve in the blow-by gas passage or with the engine body, and
- the discharge-side space is connected to a second communication passage branching off from a portion downstream of the PCV valve in the blow-by gas passage.
Dependencies are inferred from the claim text.