Systems and methods for hydraulic lash adjustment in an internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01L-001/18
F01L-009/02
F01L-013/06
출원번호
US-0946860
(2013-07-19)
등록번호
US-9200541
(2015-12-01)
발명자
/ 주소
Roberts, Gabriel Scott
Baltrucki, Justin Damien
Audibert, Kevin
출원인 / 주소
JACOBS VEHICLE SYSTEMS, INC.
대리인 / 주소
Vedder Price, P.C.
인용정보
피인용 횟수 :
1인용 특허 :
13
초록▼
Systems and methods for actuating engine valves for positive power and engine braking operation are disclosed. The systems may include a self-lashing hydraulic piston slidably disposed in a fixed or rocker arm housing. The hydraulic piston may have an internal cavity in which a motion absorbing pist
Systems and methods for actuating engine valves for positive power and engine braking operation are disclosed. The systems may include a self-lashing hydraulic piston slidably disposed in a fixed or rocker arm housing. The hydraulic piston may have an internal cavity in which a motion absorbing piston is disposed. A hydraulic fluid source may communicate with the hydraulic piston bore. A check valve which may be incorporated in a control valve may controls hydraulic fluid supply from the hydraulic fluid source to the hydraulic piston to provide self-lashing operation of the valve actuation system.
대표청구항▼
1. A system for hydraulic lash adjustment and engine valve actuation comprising: a housing disposed above an engine valve train element, said housing having a piston bore and a hydraulic fluid supply passage communicating with the piston bore;a hydraulic piston slidably disposed in the piston bore,
1. A system for hydraulic lash adjustment and engine valve actuation comprising: a housing disposed above an engine valve train element, said housing having a piston bore and a hydraulic fluid supply passage communicating with the piston bore;a hydraulic piston slidably disposed in the piston bore, said hydraulic piston having an internal cavity;a motion absorbing piston slidably disposed in the hydraulic piston internal cavity;a hydraulic fluid source communicating with the hydraulic fluid supply passage;a check valve in the hydraulic fluid supply passage between the hydraulic fluid source and the piston bore;a first spring disposed between the motion absorbing piston and the hydraulic piston; anda second spring biasing the hydraulic piston into the piston bore,wherein the hydraulic piston and the motion absorbing piston are configured such that a volume of hydraulic fluid in the piston bore and checked by the check valve causes the motion absorbing piston to engage the hydraulic piston within the internal cavity, thereby permitting conveyance of auxiliary valve actuation motions to the engine valve train element. 2. The system of claim 1, wherein a rocker arm forms said housing. 3. The system of claim 1, wherein the housing is provided in a fixed position relative to the engine valve. 4. The system of claim 1, further comprising a cam operatively connected to the hydraulic piston, said cam having a main event follow lobe and an auxiliary event lobe. 5. The system of claim 4, wherein the cam is operatively connected to the hydraulic piston by a master piston and a master piston hydraulic passage extending between the master piston and the piston bore. 6. The system of claim 4, wherein the cam is operatively connected to the hydraulic piston by the housing, and wherein a rocker arm forms the housing. 7. The system of claim 1, wherein the check valve is provided in a control valve. 8. The system of claim 1, further comprising an engine valve bridge having a sliding pin disposed in an end of the engine valve bridge, wherein the hydraulic piston or the motion absorbing piston contacts the sliding pin. 9. The system of claim 8, further comprising: means for actuating the engine valve bridge; and a hydraulic lash adjuster disposed between the means for actuating the engine valve bridge and the valve bridge. 10. The system of claim 1, further comprising: a reset bore provided in the housing; a reset passage extending through the housing from the piston bore to the reset bore; and a reset piston disposed in the reset bore. 11. The system of claim 10, further comprising a cam operatively connected to the housing, said cam having a main event lobe and an auxiliary event lobe. 12. The system of claim 1, wherein the first spring exerts a biasing force greater than a pressure force of the hydraulic fluid source, and the second spring exerts a biasing force less than a pressure force of the hydraulic fluid source. 13. A system for hydraulic lash adjustment and engine valve actuation comprising: first and second engine valves;a valve bridge extending between the first and second engine valves;a sliding pin extending through an end of the valve bridge, wherein the sliding pin contacts the first engine valve;means for actuating both the first and second engine valves through the valve bridge to provide a main valve event;a housing disposed above the valve bridge, said housing having a piston bore and a hydraulic fluid supply passage communicating with the piston bore;a hydraulic piston slidably disposed in the piston bore, said hydraulic piston having an internal cavity;a motion absorbing piston slidably disposed in the hydraulic piston internal cavity;a hydraulic fluid source communicating with the hydraulic fluid supply passage;a control valve incorporating a check valve disposed in the hydraulic fluid supply passage between the hydraulic fluid source and the piston bore;a first spring disposed between the motion absorbing piston and the hydraulic piston;a second spring biasing the hydraulic piston into the piston bore; anda cam operatively connected to the hydraulic piston, said cam having an auxiliary event lobe, wherein the hydraulic piston or the motion absorbing piston contact the sliding pin,wherein the hydraulic piston and the motion absorbing piston are configured such that a volume of hydraulic fluid in the piston bore and checked by the check valve causes the motion absorbing piston to engage the hydraulic piston within the internal cavity, thereby permitting conveyance of auxiliary valve actuation motions to the engine valve train element. 14. The system of claim 13, wherein a rocker arm forms said housing. 15. The system of claim 13, wherein the housing is provided in a fixed position relative to the engine valve. 16. The system of claim 13, wherein the cam is operatively connected to the hydraulic piston by a master piston and a master piston hydraulic passage extending between the master piston and the piston bore. 17. The system of claim 13, wherein the cam is operatively connected to the hydraulic piston by the housing, and wherein a rocker arm forms the housing. 18. The system of claim 13, further comprising: means for actuating the engine valve bridge; and a hydraulic lash adjuster disposed between the means for actuating the engine valve bridge and the valve bridge. 19. The system of claim 13, wherein the first spring exerts a biasing force greater than a pressure force of the hydraulic fluid source, and the second spring exerts a biasing force less than a pressure force of the hydraulic fluid source. 20. The system of claim 13, further comprising a main event follow lobe provided on the cam. 21. A system for hydraulic lash adjustment and engine valve actuation comprising: a rocker arm having a piston bore and a hydraulic fluid supply passage communicating with the piston bore;a hydraulic piston slidably disposed in the piston bore, said hydraulic piston having an internal cavity;a motion absorbing piston slidably disposed in the hydraulic piston internal cavity;a hydraulic fluid source communicating with the hydraulic fluid supply passage;a check valve in the hydraulic fluid supply passage between the hydraulic fluid source and the piston bore;a first spring disposed between the motion absorbing piston and the hydraulic piston;a second spring biasing the hydraulic piston into the piston bore;a cam operatively contacting the rocker arm, said cam having a main event lobe and an auxiliary event lobe;a reset bore provided in the housing;a reset passage extending through the housing from the piston bore to the reset bore; anda reset piston disposed in the reset bore, wherein the hydraulic piston or the motion absorbing piston contact the engine valve,wherein the hydraulic piston and the motion absorbing piston are configured such that a volume of hydraulic fluid in the piston bore and checked by the check valve causes the motion absorbing piston to engage the hydraulic piston within the internal cavity, thereby permitting conveyance of auxiliary valve actuation motions to the engine valve train element. 22. The system of claim 21, wherein the first spring exerts a biasing force greater than a pressure force of the hydraulic fluid source, and the second spring exerts a biasing force less than a pressure force of the hydraulic fluid source.
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