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Variable capacity turbocharger and its control method

A turbocharger, variable technology, applied in machine/engine, engine function, mechanical equipment, etc., to solve problems such as exhaust leakage, reduced boosting efficiency, and deteriorated controllability

Inactive Publication Date: 2015-09-30
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then there is a problem that the fuel or gas accumulated in the link chamber prevents the link mechanism from sliding to deteriorate the controllability”
[0007] In JP2006-233940A, because the communication passage is normally open, the exhaust gas can leak from the scroll chamber to the connecting rod chamber, causing a decrease in boosting efficiency

Method used

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  • Variable capacity turbocharger and its control method
  • Variable capacity turbocharger and its control method
  • Variable capacity turbocharger and its control method

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Embodiment Construction

[0043] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0044] An embodiment of the invention is shown in Figure 1 to Figure 12 middle. A variable capacity turbocharger 1 shown in the drawings is provided in association with an internal combustion engine (not shown). Such as Figure 1 to Figure 8 As shown in , a variable capacity turbocharger 1 includes a turbine wheel 2, a compressor wheel 3, a bearing housing 4, a turbine housing 5, a compressor housing 6, and a variable nozzle unit 7, etc.

[0045] The turbine wheel 2 is integrally formed at the first axial end of the turbine shaft 2a. The compressor wheel 3 is integrally connected to the second axial end of the turbine shaft 2a. The turbine shaft 2a is inserted through the center hole of the bearing housing 4 via two radial bearings 8A and 8B so as to be rotatable.

[0046] The two radial bearings 8A and 8B are respectively substantially cyli...

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Abstract

The variable capacity turbocharger includes a variable nozzle unit used to change a capacity at which exhaust gas is emitted from a scroll passage of a turbine housing to an exhaust port. The variable nozzle unit includes: a first and a second nozzle plates that form a flow passage routed from the scroll passage to the exhaust port; an actuator that changes an area of the flow passage; an annular space that is formed in a region adjacent to the scroll passage and in which part of power transmitting movable components of the actuator are arranged; a communication hole that is formed in the first nozzle plate and that is used to allow exhaust gas to flow from the scroll passage into the annular space; and an open / close portion that is provided at the part of the movable components and that opens or closes the communication hole.

Description

technical field [0001] The present invention relates to a variable capacity turbocharger including a variable nozzle unit for being able to change the swirl of exhaust gas from a turbine housing and a control method thereof. Passage through the turbine wheel to the capacity of the discharge port. Background technique [0002] There is a known variable geometry turbocharger as a turbocharger and the like equipped with a diesel engine (for example, see Japanese Patent Application Laid-Open No. 2006-233940 (JP2006-233940A)). A variable geometry turbocharger is capable of changing the capacity of the turbine. [0003] In this type of turbocharger, the variable nozzle unit is arranged in a communication passage that provides fluid communication between the scroll passage of the turbine housing and the discharge port to the discharge pipe. The variable nozzle unit allows the flow path area or throat area to be changed. [0004] The variable nozzle unit changes the positions of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D17/16F01D25/00
CPCF01D17/165F05D2220/40F05D2260/608F01D25/002F05D2260/607
Inventor 贞光贵裕
Owner TOYOTA JIDOSHA KK