Engine brake unit having combined oil passage
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-013/04
F02D-013/02
출원번호
US-0773519
(2010-05-04)
등록번호
US-8434451
(2013-05-07)
우선권정보
KR-10-2009-0091084 (2009-09-25)
발명자
/ 주소
Yoon, Seock Joong
Kim, Kyung Mo
출원인 / 주소
Hyundai Motor Company
대리인 / 주소
Morgan, Lewis & Bockius LLP
인용정보
피인용 횟수 :
5인용 특허 :
26
초록▼
An engine brake unit, may include a rocker shaft having an oil passage to open or close an exhaust valve when an engine braking is in operation, an exhaust rocker arm rotatable about the rocker shaft inserted into the exhaust rocker arm, wherein the exhaust rocker arm includes a supply oil passage c
An engine brake unit, may include a rocker shaft having an oil passage to open or close an exhaust valve when an engine braking is in operation, an exhaust rocker arm rotatable about the rocker shaft inserted into the exhaust rocker arm, wherein the exhaust rocker arm includes a supply oil passage communicating with the oil passage and the outside, and a recess connected to the supply oil passage and having an open lower portion, an actuator disposed in the recess of the exhaust rocker arm, wherein the actuator includes a piston that selectively moves downwards through the open lower portion of the recess by oil supplied from the supply oil passage to press the exhaust rocker arm while oil pressure in the oil passage has a predetermined pressure or more, and an oil control valve connected to the oil passage of the rocker shaft and controlling the oil pressure.
대표청구항▼
1. An engine brake unit, comprising: a rocker shaft having, therein, an oil passage through which oil flows to lubricate engine parts and to open or close an exhaust valve when an engine braking is in operation;an exhaust rocker arm rotatable about the rocker shaft inserted into the exhaust rocker a
1. An engine brake unit, comprising: a rocker shaft having, therein, an oil passage through which oil flows to lubricate engine parts and to open or close an exhaust valve when an engine braking is in operation;an exhaust rocker arm rotatable about the rocker shaft inserted into the exhaust rocker arm, wherein the exhaust rocker arm includes, therein, a supply oil passage communicating with the oil passage and the outside, and a recess connected to the supply oil passage and having an open lower portion;an actuator disposed in the recess of the exhaust rocker arm, wherein the actuator includes a piston that selectively moves downwards through the open lower portion of the recess by oil supplied from the supply oil passage to press the exhaust rocker arm while oil pressure in the oil passage has a predetermined pressure or more; andan oil control valve connected to the oil passage of the rocker shaft and controlling the oil pressure;wherein the actuator further includes:a control screw defining a hydraulic oil passage therein and having a through-hole connecting the hydraulic oil passage to the supply oil passage;a check valve received in the hydraulic oil passage of the control screw, wherein the check valve includes a check ball that selectively opens an entrance of the hydraulic oil passage according to the oil pressure; anda control valve received in an storage hole formed in an inner upper portion of the control screw and including a control piston, the control piston slidably received in the storage hole and selectively pressing the check ball according to the oil pressure so that the check ball closes or opens the entrance of the hydraulic oil passage,wherein the piston of the actuator is slidably disposed in the recess of the exhaust rocker arm, and a storage recess slidably receiving a lower portion of the control screw is formed inside the piston of the actuator, the piston of the actuator being displaced downwards from the control screw by oil supplied through the hydraulic oil passage to press the exhaust valve when the oil pressure is equal to or higher than the predetermined pressure. 2. The engine brake unit in accordance with claim 1, wherein the oil control valve supplies oil into the oil passage of the rocker shaft to control the oil pressure to be equal to or greater than the predetermined pressure when the engine braking is in operation, and to control the oil pressure to be below the predetermined pressure when the engine braking is not in operation. 3. The engine brake unit in accordance with claim 1, wherein the check valve includes: an elastic member disposed in the hydraulic oil passage and applying an elastic force to the check ball in a direction of closing the entrance of the hydraulic oil passage; anda hollow retainer fixed to a lower end portion of the hydraulic oil passage in the control screw, to support the elastic member and selectively provide oil to the piston therethrough. 4. The engine brake unit in accordance with claim 3, wherein the control valve includes a control elastic member disposed in the storage hole to apply an elastic force to move the control piston in a direction of opening or closing the through-hole according to the oil pressure, wherein the control piston has a protrusion extending from an underside thereof to come into contact with the check ball through the through-hole, so that the check ball is selectively pressed by the control piston in a direction of opening or closing the hydraulic oil passage according to the oil pressure, andwherein, while the engine braking is in operation, an operating pressure of the control elastic member is less than the predetermined pressure so that the control elastic member is compressed. 5. The engine brake unit in accordance with claim 4, wherein the control valve further includes a fixing nut fixedly coupled to an upper portion of the storage hole of the control screw, thereby supporting the control elastic member to press the control piston downwards. 6. The engine brake unit in accordance with claim 4, wherein the diameter of the protrusion is smaller than the diameter of the through-hole with a predetermined gap therebetween. 7. The engine brake unit in accordance with claim 4, wherein the control piston has an inclined surface on a lower portion thereof, the cross section of which narrows toward the protrusion, wherein the length of the control elastic member is set in such a manner that the control elastic member opens part of the through-hole when the control elastic member is free. 8. The engine brake unit in accordance with claim 7, wherein the control screw is thread-engaged with the storage hole of the exhaust rocker arm and has a flange on an outer circumference of a lower end thereof, the flange radially protruding to butt against an inner circumference of the storage recess of the piston of the actuator, andwherein the actuator further includes: a snap ring fixedly coupled to an upper portion of the storage recess of the piston of the actuator; anda return elastic member located between the snap ring and the flange of the control screw and applying an elastic force in a direction of raising the piston of the actuator. 9. The engine brake unit in accordance with claim 8, wherein the actuator further includes a displacement control ring fixed to the middle portion of the storage recess between the snap ring and a bottom portion of the storage recess to limit the displacement of the piston. 10. The engine brake unit in accordance with claim 1, wherein the recess is provided in a middle portion of the supply oil passage and selectively receives the oil from the supply oil passage and the actuator presses one portion of a valve bridge connecting two plugs of the exhaust valve together so that one of the plugs is moved downward when the engine brake is in operation.
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이 특허에 인용된 특허 (26)
Donald J. McCarthy ; Richard J. Little, Jr. ; Dennis R. Custer, Actuator piston assembly for a rocker arm system.
Faletti James J. (Spring Valley IL) Feucht Dennis D. (Morton IL) Sinn Scott G. (Morton IL), Recirculation of actuating fluid in an engine braking system.
Ruggiero, Brian; Ernest, Steven N.; Fuchs, Neil E.; Xu, Jin; Day, Eric; Paturzo, Joseph; Prusak, Johnathan W.; Mossberg, Jeffrey E., Method and system for engine cylinder decompression.
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