IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0664082
(2005-09-27)
|
등록번호 |
US-7661415
(2010-04-03)
|
우선권정보 |
JP-2004-281862(2004-09-28); JP-2005-041178(2005-02-17); JP-2005-047830(2005-02-23) |
국제출원번호 |
PCT/JP2005/018258
(2005-09-27)
|
§371/§102 date |
20070327
(20070327)
|
국제공개번호 |
WO06/035986
(2006-06-04)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
25 |
초록
▼
A bypass duct portion is provided in a casing of an EGR cooler so that heat distortion is absorbed, and the EGR cooler body and a valve case are brazed/fixed together so as to improve strength of the valve case, whereby, the bypass duct portion is formed between an inner surface of the casing and th
A bypass duct portion is provided in a casing of an EGR cooler so that heat distortion is absorbed, and the EGR cooler body and a valve case are brazed/fixed together so as to improve strength of the valve case, whereby, the bypass duct portion is formed between an inner surface of the casing and the core, a switch is provided for switching and guiding the exhaust gas to either of the core or the bypass duct portion, and a number of outer ribs formed in the circumferential direction respectively are arranged side by side while being separated from each other in the longitudinal direction in the bypass duct portion of the casing to form a heat stress absorbing portion. Also provided is a cylindrical valve case that is integrally formed by deep drawing of a thin metal plate by a press machine, a pair of slits are provided at the rear end of the valve case, both edges of an intra-valve partition plate are inserted into the slits, support projection portions are provided on both faces of the both edge portions of the intra-valve partition plate, and the edge of the slit is supported by the support projection portion. An opening of the valve case is integrally brazed/fixed to an opening of a header portion of the casing.
대표청구항
▼
The invention claimed is: 1. An EGR cooler comprising: a core having a flat first flow passage and a second flow passage alternately arranged side by side; a casing fitted to an outer periphery of the core; header portions for an exhaust gas arranged at both ends of the casing in a longitudinal dir
The invention claimed is: 1. An EGR cooler comprising: a core having a flat first flow passage and a second flow passage alternately arranged side by side; a casing fitted to an outer periphery of the core; header portions for an exhaust gas arranged at both ends of the casing in a longitudinal direction coincident with flow or the exhaust gas; a bypass duct formed between an inner surface of a bypass duct portion of the casing and a side of the core, said bypass duct portion of said casing being bent to have a cross section in an arc; said bypass duct portion of said casing having a heat stress absorbing portion including ribs configured as at least one of inner ribs or outer ribs, the ribs being arranged side by side in the longitudinal direction and extending in a circumferential direction of the arc while being separated from each other in the longitudinal direction; the first flow passage of the core accepting cooling water and the header portions directing the exhaust gas to and from the second flow passage; and a switch configured for switching and guiding the exhaust gas to either of the core or the bypass duct. 2. The EGR cooler according to claim 1, wherein one header portion of the header portions communicates with both the core and the bypass duct and is provided with one port; and another header portion of the header portions has a partition plate inside separating the core and the bypass duct from each other, and two ports are formed with the partition plate separating and defining the two ports. 3. The EGR cooler according to claim 1, further comprising a partition plate provided at a boundary between said core and said bypass duct, and the ribs and ends of the ribs are formed on the bypass duct portion of the casing so as not to cross an edge portion of the partition plate. 4. The EGR cooler according to claim 2, further comprising: an integrally formed tubular valve case formed by deep-drawing of a thin metal plate by a press machine, said valve case having a valve case opening fixed to an opening of said another header portion, an intra-valve partition plate dividing the valve case into two parts fixed inside said valve case, a rear-end edge portion of the intra-valve partition plate brazed to a tip end edge portion of the partition plate separating the core and the bypass duct, a pair of slits conforming to a plate thickness of said intra-valve partition plate are provided at a rear end of said valve case, edges of the intra-valve partition plate being inserted into the slits, and support projection portions are formed on faces of the edges of the intra-valve partition plate and arranged supported on inner edges of said slits, and a valve shaft inserted into the valve case, and a core opening/closing valve and a bypass opening/closing valve are fixed to the valve shaft and provided on both sides of said intra-valve partition plate so as to cross perpendicularly each other so that the cooling water is guided to the first flow passage of said core and the high-temperature exhaust gas is made to selectively communicate with the second flow passage side and said bypass duct portion side of said core through rotation of said valve shaft. 5. The EGR cooler according to claim 4, wherein the valve case has an outer periphery formed a substantially rectangular tubular section comprising four sides which each have a flat center part, the four sides forming the valve case opening in an oval configuration formed by projecting curved faces from the four sides, the valve case opening conforming to and fixed to the opening of the another header portion, and said valve shaft is inserted into a hole in one side of said four sides of said substantially rectangular tubular section of the valve case. 6. The EGR cooler according to claim 5, further comprising: a reinforcing body made of a press formed body of a metal plate thicker than a plate thickness of said valve case, the reinforcing body having a reinforcing body flange portion defining a valve case accepting opening within which the valve case is disposed, the valve case having a valve case flange portion defining a valve case outer opening of the valve case and engaged with the reinforcing body flange portion, the reinforcing body having a side edge portion extended integrally from a peripheral edge of the reinforcing body flange portion and brazed to an outer face of an end portion of said casing, and a valve driving device mounted to said side edge portion of the reinforcing body and connected to said valve shaft. 7. The EGR cooler according to any of claims 1, 2, 4 or 5, wherein; said core includes a core body formed by a strip-shaped metal plate turned up and bent in a fanfold manner with turned-up end edges alternately formed at one end and another end of a rectangular flat face portion and the flat first flow passage and the second flow passage are provided alternately in a thickness direction of the metal plate, the first flow passage of the core body is defined in part by comb members disposed at opposing end positions of said turned-up end edges, and a fin is set within said second flow passage, the core body is fitted within the casing so as to block the adjacent turned-up end edges, the first flow passage being further defined by a casing side of said casing having a pair of ports on an outer face of said casing side for accepting cooling water, while the exhaust gas is guided from a first end of said casing to a second end through the second flow passage and the bypass duct.
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