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Exhaust gas recirculation device for engine

一种引擎、排气阀的技术，应用在装料系统、废气再循环、燃料中加入非燃料物质等方向，能够解决成本高、EGR机构复杂构造等问题，达到减低NOX、抑制燃烧温度的上升、降低成本的效果

Inactive Publication Date: 2010-05-05
YANMAR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the exhaust recirculation device of the above-mentioned engine, the EGR passage is formed by installing piping between the intake passage and the exhaust passage, and the EGR mechanism is formed. The EGR mechanism is a very complicated structure and the cost is high.

Method used

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  • Exhaust gas recirculation device for engine
  • Exhaust gas recirculation device for engine
  • Exhaust gas recirculation device for engine

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Embodiment Construction

[0034] First, the overall structure of the engine of the present invention will be described.

[0035] As shown in Figure 1, the main body of the engine 1 is composed of an upper cylinder block 2 and a lower crankcase 5, and a cylinder block 2a is formed at the center of the cylinder block 2 facing up and down. Piston 4 is accommodated in 2a. A crankshaft 3 is pivotally supported in the front-rear direction on the crankcase 5 , and the crankshaft 3 and the piston 4 are connected via a connecting rod 17 .

[0036] A cylinder head 6 is arranged on the above-mentioned cylinder block 2, and an organic cover shell 7 is arranged on the cylinder head 6 to form a valve wrist chamber. A muffler 8 is disposed on one side of the cylinder head 6 at the top of the engine (the left side in the first figure), and a fuel tank 9 is disposed on the other side (the right side in the first figure).

[0037] A balance weight, a governor device 11 and the like are arranged in the crankcase 5 at t...

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Abstract

In an exhaust gas recirculation device for an engine with a mechanism for recirculating a portion of exhaust gas to the suction side of a cylinder head, a communication hole is opened in a wall between an exhaust port and suction port of the cylinder head. The communication hole is provided obliquely from the upper side to lower side of the wall, and the communication hole at the suction side is opened in a direction along the direction of swirls of sucked air. Further, a choke is provided in at least either a suction flow passage communicated with the suction port or an exhaust flow passage communicated with the exhaust port, and the opening area of the suction flow passage or the exhaust flow passage is variable by the throttle.

Description

technical field [0001] This invention relates to the structure of an exhaust recirculation device for an engine provided with an exhaust gas recirculation mechanism for recirculating a part of exhaust gas to an intake side. Background technique [0002] Conventionally, an exhaust gas recirculation device of an engine is equipped with an exhaust gas recirculation (hereinafter referred to as EGR) mechanism, which communicates the intake passage and the exhaust passage to recirculate the exhaust gas toward the intake side. The EGR mechanism will return part of the gas exhausted from the engine to the intake passage, and reduce the NOx by reducing the temperature of the combustion gas in the cylinder. X . [0003] Moreover, in order to constitute the EGR mechanism, for example, in the technique disclosed in Japanese Patent Application Laid-Open No. 5-18323, an EGR passage is formed between the intake passage and the exhaust passage, and the exhaust passage communicates with the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D21/08F02M25/07F02D9/02F02D9/04
CPCY02T10/146Y02T10/121F02M25/0723F02M25/078F02M25/0782F02M26/20F02M26/60F02M26/615Y02T10/12F02F1/42
Inventor 西村伸治升田宏树藤井裕之
Owner YANMAR CO LTD
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