INTERNAL COMBUSTION ENGINE

• US 20190309648A1
• Filed: 02/11/2019
• Published: 10/10/2019
• Est. Priority Date: 04/06/2018
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: TABATA, Masakazu
• Granted Patent: US 10,774,675 B2
• Time in Patent Office: Days
• CPC Class Codes: F01D 1/20 traversed by the working-fluid substantially axially
• CPC Class Codes: F01D 17/162 for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line F01D17/167 takes precedence
• CPC Class Codes: F02B 37/02 Gas passages between engine outlet and pump drive, e.g. reservoirs
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F04D 25/024 the driving means being assisted by a power recovery turbine
• CPC Class Codes: F04D 25/04 the pump being fluid-driven pumps driven by exhaust gases F02B37/00, F02B39/00; turbochargers F02C6/12
• CPC Class Codes: F04D 29/051 Axial thrust balancing
• CPC Class Codes: F05B 2220/40 in turbochargers
• CPC Class Codes: F05D 2220/40 in turbochargers
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An internal combustion engine is equipped with a turbocharger that includes: a centrifugal compressor impeller; an axial flow turbine wheel coupled to the compressor impeller via a rotational shaft; a bearing that supports the rotational shaft; and a housing that houses at least the compressor impeller and the bearing among the compressor impeller, the bearing and the turbine wheel. The turbine wheel is coupled to the rotational shaft such that an outlet of turbine blades of the turbine wheel is located on the side of the compressor impeller. The compressor impeller is arranged such that an inlet of the compressor impeller becomes closer to the turbine wheel than an outlet of the compressor impeller.

Claims

1. An internal combustion engine, comprising a turbocharger that includes:

a centrifugal compressor impeller;

an axial flow turbine wheel coupled to the compressor impeller via a rotational shaft;

a bearing that supports the rotational shaft; and

a housing that houses at least the compressor impeller and the bearing among the compressor impeller, the bearing and the turbine wheel,

wherein the turbine wheel is coupled to the rotational shaft such that an outlet of turbine blades of the turbine wheel is located on a side of the compressor impeller, and

wherein the compressor impeller is arranged such that an inlet of the compressor impeller becomes closer to the turbine wheel than an outlet of the compressor impeller.

2. The internal combustion engine according to claim 1,

wherein the bearing is arranged at a portion of the rotational shaft located between the compressor impeller and the turbine wheel,

wherein the turbocharger further includes:

a scroll portion through which gas that has flown out from the compressor impeller flows; and

an oil seal portion interposed between a portion of the housing located between the bearing and the compressor impeller, and the rotational shaft, and

wherein the housing includes a communication passage that causes a gap located between the housing and the rotational shaft at a location closer to the compressor impeller than the oil seal portion to communicate with the scroll portion.

3. The internal combustion engine according to claim 1,

wherein the internal combustion engine includes a cylinder head, and

wherein the housing is fastened to the cylinder head directly or with a gasket interposed between the housing and the cylinder head such that the turbine wheel is opposed to the cylinder head.