Lost motion assembly in a valve bridge for use with a valve train comprising a hydraulic lash adjuster
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01L-009/02
F01L-001/14
F01L-001/26
출원번호
US-0858644
(2015-09-18)
등록번호
US-9611767
(2017-04-04)
발명자
/ 주소
Baltrucki, Justin
출원인 / 주소
Jacobs Vehicle Systems, Inc.
대리인 / 주소
Moreno IP Law LLC
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
In an internal combustion engine comprising two or more engine valves that receive valve actuation motions from a valve actuation motion source via a valve train, which valve train comprises a hydraulic lash adjuster, an apparatus for valve actuation comprises a valve bridge and a lost motion assemb
In an internal combustion engine comprising two or more engine valves that receive valve actuation motions from a valve actuation motion source via a valve train, which valve train comprises a hydraulic lash adjuster, an apparatus for valve actuation comprises a valve bridge and a lost motion assembly disposed therein. The lost motion assembly comprises a first piston disposed in a first piston bore formed in the valve bridge. The first piston is configured to operatively connect with a component of the valve train. A biasing element is configured to bias the first piston out of the first piston bore with a first force that is greater than a second force applied to the first piston by the hydraulic lash adjuster. A travel limiter is configured to limit travel of the first piston out of the first piston bore to be no greater than a maximum lost motion distance.
대표청구항▼
1. An apparatus for actuating at least one of two or more engine valves in an internal combustion engine, comprising: a valve bridge operatively connected to the two or more engine valves; anda hydraulically-actuated lost motion assembly disposed in the valve bridge, the hydraulically-actuated lost
1. An apparatus for actuating at least one of two or more engine valves in an internal combustion engine, comprising: a valve bridge operatively connected to the two or more engine valves; anda hydraulically-actuated lost motion assembly disposed in the valve bridge, the hydraulically-actuated lost motion assembly comprising:a first piston disposed within a first piston bore formed in the valve bridge and configured to operatively connect with the valve train;a first biasing element configured to bias the first piston out of the first piston bore, the first biasing element further configured to provide a first force to the first piston that is greater than a second force applied to the first piston by a lash adjuster; anda travel limiter configured to limit travel of the first piston out of the first piston bore,wherein the lash adjuster is disposed upstream of the hydraulically-actuated lost motion assembly in a valve train configured to be operatively connected to a valve actuation motion source and to the valve bridge. 2. The apparatus of claim 1, wherein the first piston comprises an internal cavity configured for fluid communication with a hydraulic fluid supply, and further comprising: a check valve disposed in the internal cavity and configured to permit one-way flow of hydraulic fluid from the hydraulic fluid supply into the internal cavity and the first piston bore. 3. The apparatus of claim 2, wherein the hydraulic fluid supply comprises a selectable hydraulic fluid source. 4. The apparatus of claim 3, further comprising: a reset assembly comprising:a reset valve disposed in the valve bridge in fluid communication with first piston bore; anda fixed reaction surface configured to operatively connect with the reset valve, thereby opening and closing the reset valve. 5. The apparatus of claim 3, wherein the valve bridge further comprises a slave piston disposed in a slave piston bore formed in the valve bridge, a hydraulic circuit formed in the valve bridge in fluid communication with the first piston bore and the slave piston bore. 6. The apparatus of claim 5, further comprising: a reset assembly comprising:a bleed hole formed in the valve bridge in fluid communication with slave piston bore; anda fixed reaction surface configured to operatively connect with the valve bridge thereby providing selective sealing engagement with the bleed hole. 7. The apparatus of claim 2, wherein the hydraulic fluid supply comprises a constant hydraulic fluid source. 8. The apparatus of claim 7, further comprising: a reset assembly comprising:a reset valve disposed in the valve bridge in fluid communication with first piston bore; andan actuator configured to selectively open and close the reset valve. 9. A system for actuating the two or more engine valves comprising the apparatus of claim 1, and further comprising: a hydraulic fluid supply to the lost motion assembly, wherein the hydraulic fluid supply is provided via a component of the valve train operatively connected to and in fluid communication with the lost motion assembly, the hydraulic fluid supply configured independent of another hydraulic fluid supply for the hydraulic lash adjuster. 10. A system for actuating the two or more engine valves comprising the lost motion assembly of claim 1, and further comprising: a hydraulic fluid supply to the lost motion assembly, wherein the hydraulic fluid supply is provided via a component of the valve train operatively connected to and in fluid communication with the lost motion assembly, the hydraulic fluid supply configured to also supply the hydraulic lash adjuster. 11. The system of claim 10, the hydraulic lash adjuster further comprising: a lash adjuster housing having a lash piston bore configured for fluid communication with the hydraulic fluid supply;a lash piston slidably disposed in the lash piston bore and forming a chamber between the lash adjuster housing and the lash piston, the lash piston having an internal cavity configured for fluid communication with the hydraulic fluid source and having an opening between the internal cavity and the chamber; anda check valve disposed in the chamber and configured to permit one-way flow of hydraulic fluid via the lash piston bore, internal cavity and opening into the chamber,wherein the lash adjuster housing further comprises a first hydraulic fluid passage configured for fluid communication with the hydraulic fluid supply, the first hydraulic fluid passage further configured to bypass the lash piston bore, lash piston and check valve and to provide hydraulic fluid to an output port configured for fluid communication with the lost motion assembly. 12. The system of claim 11, wherein the valve train comprises a rocker arm having a second hydraulic fluid passage and a lash adjuster bore formed in the rocker arm, wherein the lash adjuster housing is disposed within the lash adjuster bore such that the second hydraulic fluid passage serves as the hydraulic fluid supply to the first hydraulic fluid passage. 13. The system of claim 12, the lash adjuster housing comprising a side wall, wherein the first hydraulic fluid passage is configured for fluid communication with the second hydraulic fluid passage via an opening formed in the side wall. 14. The system of claim 12, wherein the lash adjuster bore comprises a lateral hydraulic fluid passage formed in and extending axially along a wall defining the lash adjuster bore, the lateral hydraulic fluid passage providing fluid communication from the second hydraulic fluid passage to the lash adjuster bore. 15. The system of claim 14, wherein the lateral hydraulic fluid passage is configured such that hydraulic fluid from the second hydraulic fluid passage flows more readily through the first hydraulic fluid passage than the lateral hydraulic fluid passage.
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이 특허에 인용된 특허 (9)
Feucht Dennis D. (Morton IL) Sinn Scott G. (Morton IL) Faletti James J. (Spring Valley IL), Engine compression braking apparatus and method.
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