Engine supercharger

Patent metadata

Field	Value
Publication number	US-10260404-B2
Application number	US-201715422603-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Feb 16, 2016
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

Disclosed herein is a technique for providing an engine supercharger of a reduced size allowing an exhaust gas to be introduced smoothly into a turbine scroll. A turbine for use in this supercharger includes: a turbine lead-in route, into which the exhaust gas is introduced; a turbine scroll formed continuously with the turbine lead-in route to allow the exhaust gas to swirl around inside; a turbine wheel to turn on an axis of rotation; a turbine lead-out route; a wastegate passage to bypass the exhaust gas around the turbine scroll; and a wastegate valve. The turbine lead-in route includes a throat portion having a tapered downstream portion. The wastegate passage branches from that throat portion.

First claim

What is claimed is:

1. A supercharger for use in an engine with a cylinder head, and a turbine housing, the turbine housing including a turbine, the turbine comprising:
a turbine lead-in route into which an exhaust gas released from respective cylinders of the engine is introduced;
a turbine scroll arranged downstream of, and continuously with, the turbine lead-in route to allow the exhaust gas to swirl around inside;
a turbine wheel housed in the turbine scroll so as to be turned around an axis of rotation by the exhaust gas;
a turbine lead-out route communicating with the turbine scroll and allowing the exhaust gas that has left the turbine scroll to flow therethrough;
a wastegate passage branching from the turbine lead-in route to communicate with the turbine lead-out route and allowing the exhaust gas to flow therethrough while being bypassed around the turbine scroll; and
a wastegate valve configured to open and close a flow channel of the wastegate passage according to an operating state of the engine, wherein
the turbine lead-in route includes:
a gas combining portion arranged at an upstream point to combine exhaust gas flows together,
a throat portion arranged continuously with the gas combining portion and having a tapered downstream portion, and
a straight portion that connects an exhaust gas outlet side of the throat portion with an exhaust gas inlet side of the turbine,

the wastegate passage branches from the throat portion,
the gas combining portion, the throat portion, and the straight portion are located within the turbine housing, and
the straight portion has a portion with a constant flow cross section and is arranged continuously with the throat portion.

2. The supercharger of claim 1 , wherein
the wastegate passage communicates with the turbine lead-out route in the vicinity of the exhaust gas inlet side of the turbine, and
the wastegate valve is arranged at an outlet of the wastegate passage.

3. The supercharger of claim 1 , wherein
the turbine lead-in route is partitioned by a partition wall into a first lead-in route functioning as an inner route for introducing the exhaust gas into the turbine scroll and a second lead-in route functioning as an outer route for introducing the exhaust gas into the turbine scroll,
an exhaust variable valve is provided upstream of the second lead-in route in order to vary a flow rate of the exhaust gas being introduced into the second lead-in route by changing its flow cross section, and
the wastegate passage is provided for the second lead-in route.

4. The supercharger of claim 1 , wherein
the turbine lead-in route is partitioned by a partition wall into a first lead-in route functioning as an inner route for introducing the exhaust gas into the turbine scroll and a second lead-in route functioning as an outer route for introducing the exhaust gas into the turbine scroll,
an exhaust variable valve is provided upstream of the second lead-in route in order to vary a flow rate of the exhaust gas being introduced into the second lead-in route by changing its flow cross section, and
the wastegate passage is provided for the second lead-in route.

5. The supercharger of claim 1 , wherein
the wastegate passage communicates with the turbine lead-out route in the vicinity of the exhaust gas inlet side of the turbine, and
the wastegate valve is arranged at an outlet of the wastegate passage.

6. The supercharger of claim 5 , wherein
the turbine lead-in route is partitioned by a partition wall into a first lead-in route functioning as an inner route for introducing the exhaust gas into the turbine scroll and a second lead-in route functioning as an outer route for introducing the exhaust gas into the turbine scroll,
an exhaust variable valve is provided upstream of the second lead-in route in order to vary a flow rate of the exhaust gas being introduced into the second lead-in route by changing its flow cross section, and
the wastegate passage is provided for the second lead-in route.

7. The supercharger of claim 1 , wherein
the wastegate passage is arranged parallel to the straight portion.

8. The supercharger of claim 7 , wherein
the wastegate passage communicates with the turbine lead-out route in the vicinity of the exhaust gas inlet side of the turbine, and
the wastegate valve is arranged at an outlet of the wastegate passage.

9. The supercharger of claim 7 , wherein
the turbine lead-in route is partitioned by a partition wall into a first lead-in route functioning as an inner route for introducing the exhaust gas into the turbine scroll and a second lead-in route functioning as an outer route for introducing the exhaust gas into the turbine scroll,
an exhaust variable valve is provided upstream of the second lead-in route in order to vary a flow rate of the exhaust gas being introduced into the second lead-in route by changing its flow cross section, and
the wastegate passage is provided for the second lead-in route.

10. The supercharger of claim 1 , wherein
the wastegate passage branches from the downstream portion of the throat portion.

11. The supercharger of claim 10 , wherein
the wastegate passage communicates with the turbine lead-out route in the vicinity of the exhaust gas inlet side of the turbine, and
the wastegate valve is arranged at an outlet of the wastegate passage.

12. The supercharger of claim 10 , wherein
the turbine lead-in route is partitioned by a partition wall into a first lead-in route functioning as an inner route for introducing the exhaust gas into the turbine scroll and a second lead-in route functioning as an outer route for introducing the exhaust gas into the turbine scroll,
an exhaust variable valve is provided upstream of the second lead-in route in order to vary a flow rate of the exhaust gas being introduced into the second lead-in route by changing its flow cross section, and
the wastegate passage is provided for the second lead-in route.

13. The supercharger of claim 10 , wherein
the wastegate passage is arranged parallel to the straight portion.

14. The supercharger of claim 13 , wherein
the wastegate passage communicates with the turbine lead-out route in the vicinity of the exhaust gas inlet side of the turbine, and
the wastegate valve is arranged at an outlet of the wastegate passage.

15. The supercharger of claim 13 , wherein
the turbine lead-in route is partitioned by a partition wall into a first lead-in route functioning as an inner route for introducing the exhaust gas into the turbine scroll and a second lead-in route functioning as an outer route for introducing the exhaust gas into the turbine scroll,
an exhaust variable valve is provided upstream of the second lead-in route in order to vary a flow rate of the exhaust gas being introduced into the second lead-in route by changing its flow cross section, and
the wastegate passage is provided for the second lead-in route.

16. A supercharger for use in an engine with a turbine, the turbine comprising:
a turbine lead-in route into which an exhaust gas released from respective cylinders of the engine is introduced;
a turbine scroll arranged downstream of, and continuously with, the turbine lead-in route to allow the exhaust gas to swirl around inside;
a turbine wheel housed in the turbine scroll so as to be turned around an axis of rotation by the exhaust gas;
a turbine lead-out route communicating with the turbine scroll and allowing the exhaust gas that has left the turbine scroll to flow therethrough;
a wastegate passage branching from the turbine lead-in route to communic

Assignees

• Mazda Motor

Inventors

• Uehane Yoshiyuki
• Umemura Junji
• Fujiyama Tomoaki
• Hadama Koji
• Mihara Makoto

Classifications

• F01D9/026

  Scrolls for radial machines or engines · CPC title

• F02B37/183 Primary

  Arrangements of bypass valves or actuators therefor · CPC title

• F01D17/105

  by passing part of the fluid · CPC title

• F01D17/148

  by means of rotatable members, e.g. butterfly valves · CPC title

• F01D17/18

  varying effective number of nozzles or guide conduits {, e.g. sequentially operable valves for steam turbines} · CPC title