Turbocharger turbine housing scroll passage

Patent metadata

Field	Value
Publication number	US-11808173-B2
Application number	US-202017781970-A
Country	US
Kind code	B2
Filing date	Jan 7, 2020
Priority date	Jan 7, 2020
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A scroll passage of a turbine housing includes: an outer peripheral surface extending along an axial direction of the turbine housing; an inner peripheral surface disposed inward of the outer peripheral surface; a one-side surface extending along the radial direction; an other-side surface disposed closer to an outlet of the housing; a one-side outer peripheral R portion connecting the one-side surface and the outer peripheral surface; an other-side outer peripheral R portion connecting the other-side surface and the outer peripheral surface; and an other-side inner peripheral R portion connecting the other-side surface and the inner peripheral surface. A ratio of a width dimension of the scroll passage to an R dimension of each portion is defined as a peripheral R ratio, and the peripheral R ratio has an R ratio increasing region the ratio increases from upstream to downstream in the scroll passage.

First claim

The invention claimed is:

1. A turbine housing, comprising a scroll passage, wherein the scroll passage includes:
an outer peripheral surface extending along an axial direction of the turbine housing;
an inner peripheral surface disposed inward of the outer peripheral surface in a radial direction of the turbine housing;
a one-side surface which is a side surface on one side in the axial direction of the turbine housing, the one-side surface extending along the radial direction of the turbine housing;
an other-side surface which is a side surface on another side in the axial direction of the turbine housing, the other-side surface being disposed closer to an outlet of the turbine housing than the one-side surface and extending along the radial direction of the turbine housing;
a one-side outer peripheral R portion connecting an outer peripheral end of the one-side surface and a one-side end of the outer peripheral surface;
an other-side outer peripheral R portion connecting an outer peripheral end of the other-side surface and an other-side end of the outer peripheral surface; and
an other-side inner peripheral R portion connecting an inner peripheral end of the other-side surface and an other-side end of the inner peripheral surface,
wherein, in a cross-sectional view of the scroll passage, a ratio of a width dimension of the scroll passage along the axial direction to an R dimension of each of the one-side outer peripheral R portion, the other-side outer peripheral R portion, and the other-side inner peripheral R portion is defined as a one-side outer peripheral R ratio, an other-side outer peripheral R ratio, and an other-side inner peripheral R ratio, respectively,
the scroll passage has an R ratio increasing region where at least one of the one-side outer peripheral R ratio, the other-side outer peripheral R ratio, and the other-side inner peripheral R ratio increases from upstream to downstream in the scroll passage, and
wherein, an angular position of a winding start portion of the scroll passage about an axis of the turbine housing is defined as 0 degrees, and an angular position of a winding end portion of the scroll passage about the axis of the turbine housing is defined as 360 degrees, and
at least part of the angular range in which the R ratio increasing region is formed is included in the angular range from 0 degrees or more to 90 degrees or less.

2. The turbine housing according to claim 1 ,
wherein the R ratio increasing region includes a one-side outer peripheral R ratio increasing region where the one-side outer peripheral R ratio increases from upstream to downstream in the scroll passage.

3. The turbine housing according to claim 1 ,
wherein the R ratio increasing region includes an other-side outer peripheral R ratio increasing region where the other-side outer peripheral R ratio increases from upstream to downstream in the scroll passage.

4. The turbine housing according to claim 2 ,
wherein, an angular position of a winding start portion of the scroll passage about an axis of the turbine housing is defined as 0 degrees, and an angular position of a winding end portion of the scroll passage about the axis of the turbine housing is defined as 360 degrees, and
the one-side outer peripheral R ratio at an angular position of equal to or more than 180 degrees and less than 360 degrees is larger than the one-side outer peripheral R ratio at an angular position of equal to or more than 0 degrees and less than 180 degrees.

5. The turbine housing according to claim 3 ,
wherein, an angular position of a winding start portion of the scroll passage about an axis of the turbine housing is defined as 0 degrees, and an angular position of a winding end portion of the scroll passage about the axis of the turbine housing is defined as 360 degrees, and
the other-side outer peripheral R ratio at an angular position of equal to or more than 180 degrees and less than 360 degrees is larger than the other-side outer peripheral R ratio at an angular position of equal to or more than 0 degrees and less than 180 degrees.

6. The turbine housing according to claim 4 ,
wherein, the angular position of the winding start portion of the scroll passage about the axis of the turbine housing is defined as 0 degrees, and the angular position of the winding end portion of the scroll passage about the axis of the turbine housing is defined as 360 degrees, and
the R dimension of the one-side outer peripheral R portion is constant at least in a range where the angular position is equal to or more than 0 degrees and less than 240 degrees.

7. The turbine housing according to claim 5 ,
wherein, the angular position of the winding start portion of the scroll passage about the axis of the turbine housing is defined as 0 degrees, and the angular position of the winding end portion of the scroll passage about the axis of the turbine housing is defined as 360 degrees, and
the R dimension of the other-side outer peripheral R portion is constant at least in a range where the angular position is equal to or more than 0 degrees and less than 240 degrees.

8. A turbocharger, comprising:
the turbine housing according to claim 1 .

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Hoshi Toru
• Nakagawa Hiroshi
• Miyoshi Shunsuke
• Nitta Kenji
• Irie Sosuke

Classifications

• F01D9/026 Primary

  Scrolls for radial machines or engines · CPC title

• F01D25/24

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F05D2240/14

  Casings or housings protecting or supporting assemblies within · CPC title

• F05D2250/38

  angled, e.g. sweep angle · CPC title