# US 2021/0340893 A1 · Blow-by gas recirculation device for internal combustion engine

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- Number: US 2021/0340893 A1
- Document ID: US20210340893A1
- Status: Published application
- Kind: A1
- Application number: 17/259,768
- Filed: 2019-06-19
- Published: 2021-11-04
- Earliest claimed: 2018-07-12
- Assignees: Isuzu Motors Limited
- Applicants: Isuzu Motors Limited
- Inventors: Hideki OSADA
- Web page: https://patentgrep.com/patent/US20210340893A1

## CPC

- F01M 13/04: having means for purifying air before leaving crankcase, e.g. removing oil
- B01D 46/0031: {with collecting, draining means}
- B01D 46/24: Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D 53/0407: {Constructional details of adsorbing systems}
- F02M 35/10222: {Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission}
- B01D 2257/70: Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D 2259/4566: for use in transportation means
- F01M 2013/027: {with a turbo charger or compressor}
- F01M 2013/0438: {with a filter}
- F02B 37/00: Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A blow-by gas recirculation device includes: a blow-by gas passage connected to an intake passage; an oil separator provided in the blow-by gas passage; and an adsorption/desorption member which is provided in the intake passage and/or the blow-by gas passage. The intake passage and the blow-by gas passage is located between the oil separator and the compressor of a turbocharger, and the adsorption/desorption member is configured so as to adsorb oil contained in a blow-by gas B and desorb the oil while the diameter of particles of the oil is increased.

## Claims

### Claim 1

A blow-by gas recirculation device for an internal combustion engine that includes an intake passage and a compressor of a turbocharger provided in the intake passage, the blow-by gas recirculation device comprising:
a blow-by gas passage that is connected to the intake passage at a position on an upstream side of the compressor;
an oil separator, provided in the blow-by gas passage, for separating oil from a blow-by gas; and
an adsorption/desorption member that is provided in at least one of the blow-by gas passage and the intake passage located between the oil separator and the compressor, and that is configured to adsorb oil contained in a blow-by gas that has passed through the oil separator, and expand a particle diameter of the oil to desorb the oil.

### Claim 2 (depends on 1)

The blow-by gas recirculation device according to claim 1,
wherein the intake passage includes a connection portion to which the blow-by gas passage is connected, and
the adsorption/desorption member is provided on an inner circumferential surface of the connection portion that is located on a side opposite to a blow-by gas passage side.

### Claim 3 (depends on 1)

The blow-by gas recirculation device according to claim 1,
wherein a bent portion is formed on at least one of the intake passage and the blow-by gas passage, and
the adsorption/desorption member is provided on an inner circumferential surface on an outer corner side of the bent portion.

### Claim 4 (depends on 1)

The blow-by gas recirculation device according to claim 1,
wherein the adsorption/desorption member is formed of a nonwoven fabric.