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Waste gate valve device

A technology of wastegate valve and exhaust gas passage, which is applied in engine components, machines/engines, internal combustion piston engines, etc., can solve the problems of difficult to manage exhaust turbine responsiveness, uncontrollable exhaust turbine responsiveness, etc., and achieve disassembly and assembly. and easy replacement, less damage, and improved responsiveness

Inactive Publication Date: 2012-05-23
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] That is, even in the wastegate valve having the above-mentioned swing-type spool when the valve opening degree is extremely small (approximately 0 to 20°), that is, in the state where the wastegate valve is nearly fully closed, the wastegate may pass through the wastegate valve. Flow to the exhaust passage side, in the above-mentioned wastegate flow rate characteristics, it is difficult to manage the responsiveness of the exhaust turbine, and it is impossible to control the responsiveness of the exhaust turbine

Method used

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Examples

Experimental program
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Effect test

no. 1 approach

[0072] figure 1 It is a longitudinal sectional view of the wastegate valve in the first embodiment of the present invention. figure 2 (A) is the relationship between the ratio of (W / G (wastegate valve) passing flow rate to the passing flow rate when W / G (wastegate valve) is fully open) and the valve opening degree in the first embodiment line graph. figure 2 (B) and (C) are longitudinal cross-sectional views showing two examples of the wastegate.

[0073] Regarding the wastegate valve 100, as Figure 18 As shown, the exhaust gas supplied to the turbine 2 through the exhaust gas passage 11 from an unshown engine is branched from the exhaust gas passage 11 upstream of the turbine 2 to bypass the turbine 2 and flow to the exhaust bypass passage. 5, and then communicate with the exhaust outlet passage 18s via the wastegate 100.

[0074] That is, in the wastegate valve 100, the valve body 1 reciprocates to open and close the valve seat portion 12 of the exhaust bypass passage...

no. 2 approach

[0092] image 3 It is a longitudinal sectional view of the wastegate valve in the second embodiment of the present invention.

[0093] In the second embodiment, when the distance between the swing center 14e of the support arm 3 and the front end A of the protrusion 2 is L1, the distance between the swing center 14e of the support arm 3 and the front end A of the protrusion 2 is L1. When the distance between the furthest point C is L2, and the distance between the swing center 14e of the support arm 3 and the opening end of the exhaust gas passage hole 5s is L3, the protruding part 2 satisfies L3>L1 and L3>L2 constituted in a manner.

[0094] The other structures are the same as those of the above-mentioned first embodiment, and the same members are denoted by the same symbols.

[0095] According to the above-mentioned second embodiment, when the protrusion 2 moves in the exhaust gas passage hole 5s, if the distance between the swing center 14e and the opening end of the exh...

no. 3 approach

[0098] Figure 4 (A) is a longitudinal sectional view of a wastegate valve in a third embodiment of the present invention. (B) is a graph showing the relationship between the ratio (W / G (wastegate valve) passing flow rate and W / G (wastegate valve) passing flow rate when fully open) and the valve opening degree in the third embodiment.

[0099] In the third embodiment, the protruding portion 2 is arranged as a cylinder having a thickness of t1 to t2, a thickness of t3 to t4, and a thickness of t5 to t6 linearly changing along the radial direction. A plurality of bodies 2e, 2f, 2g are connected (three in this example), and the cylinders 2e, 2f, 2g are arranged so that they do not interfere with the exhaust gas passage hole 5s when the valve body 1 is opened. It coincides with the valve core 1 obliquely.

[0100] The other structures are the same as those of the above-mentioned first embodiment, and the same members are denoted by the same symbols.

[0101] In the above-mentio...

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Abstract

A waste gate valve device is configured so that the waste gate valve (100) is fully closed when the valve body of the waste gate valve (100) has been moved from the exhaust outlet path (18s) side to the exhaust bypass path (5) side and brought into contact with the seat surface (12a) of a valve seat section (12) formed around the exhaust bypass path (5). In order to reduce the area of the path for the exhaust gas, a protrusion (2) having a given height is formed on the side of the valve body (1) of the waste gate valve (100) which makes contact with the seat surface (12a).

Description

technical field [0001] The present invention relates to a wastegate valve device for opening and closing an exhaust bypass passage leading to an exhaust gas outlet passage from an exhaust passage to an exhaust turbine, bypassing the exhaust turbine, and opening and closing the exhaust bypass passage. The exhaust turbine is driven by the exhaust gas from the engine. Background technique [0002] A relatively small exhaust turbocharger is equipped with a wastegate valve device that opens and closes an exhaust bypass passage that bypasses the exhaust gas from the exhaust passage to the exhaust turbine. The exhaust gas turbine leads to the exhaust gas outlet passage, and the exhaust turbine is driven by exhaust gas. When the exhaust gas of the engine is too large, the exhaust turbocharger opens the waste gate valve so that part of the exhaust gas bypasses the exhaust turbine. Release to the exhaust gas outlet passage, maintain the exhaust gas flow rate at an appropriate flow ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B37/18
CPCF01D17/105F05D2220/40F05B2220/40Y02T10/144Y02T10/16F02B37/186F02B37/183Y02T10/12F02B37/18F02B37/12
Inventor 八十岛健
Owner MITSUBISHI HEAVY IND LTD