Variable valve actuation mechanism for overhead-cam engines with an oscillating/sliding follower
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01L-001/34
F01L-001/30
F01L-001/18
F01L-003/10
F01L-013/00
F01L-001/46
출원번호
US-0038445
(2011-03-02)
등록번호
US-8915220
(2014-12-23)
발명자
/ 주소
Gecim, Burak A.
출원인 / 주소
GM Global Technology Operations LLC
인용정보
피인용 횟수 :
0인용 특허 :
9
초록▼
A finger follower apparatus to effect opening of an engine valve includes a first member with first and second opposite ends. The first member is pivotally fixed at the first end and operatively engaged with the engine valve at the second end. A second member is slidably engaged with the first membe
A finger follower apparatus to effect opening of an engine valve includes a first member with first and second opposite ends. The first member is pivotally fixed at the first end and operatively engaged with the engine valve at the second end. A second member is slidably engaged with the first member and carries a roller for engagement with a cam.
대표청구항▼
1. A finger follower apparatus to effect opening of an engine valve, comprising: a first member including first and second opposite ends, the first member being pivotally fixed at the first end and operatively engaged with the engine valve at the second end;a second member slidably engaged with the
1. A finger follower apparatus to effect opening of an engine valve, comprising: a first member including first and second opposite ends, the first member being pivotally fixed at the first end and operatively engaged with the engine valve at the second end;a second member slidably engaged with the first member and carrying a first roller engaged with a cam, said second member having a control surface which when cooperatively engaged with a second roller of a valve actuator in response to said cam rotation establishes a valve lift profile for the engine valve, wherein the control surface comprises an arcuate surface;the valve lift actuator comprising a linear actuator rigidly mounted to the engine and having an extendable biasing arm connected at a distal end to the second roller, the biasing arm including a biasing member between the linear actuator and a retention plate, wherein the biasing member is configured to bias the biasing arm in a first direction toward the first member;the linear actuator selectively engaging the second roller with the control surface and selectable to linearly translate the biasing arm between a fully extended position in the first direction toward the first member and a fully retracted position in an opposite second direction away from the first member to enable continuously variable adjustment of a peak magnitude of lift during an opening profile for the engine valve, comprising the fully extended position actuating the engine valve in a high-lift mode, wherein the high-lift mode comprises the peak magnitude of lift of the engine valve at a high peak position when a cam lobe peak of the cam is engaged with the first roller and the closed position when a cam lobe base is engaged with the first roller,the fully retracted position actuating the engine valve in a no-lift mode comprising no lift of the engine valve, wherein the no-lift mode comprises the linear actuator controlled to overcome the biasing member such that the biasing arm linearly translates to the fully retracted position as engagement between the cam lobe and the first roller translationally slides the second member along the first member in the second direction while the control surface of the second member is engaged to the second roller, the linear translation of the biasing arm to the fully retracted position prevents any occurrence of lift of the engine valve regardless of the engagement between the first roller and each of the cam lobe peak and the cam lobe base, andan intermediate extended position actuating the engine valve in a low-lift mode, wherein the low-lift mode comprises the peak magnitude of lift of the engine valve at a low peak position when the cam lobe peak is engaged with the first roller and the closed position when the cam lobe base is engaged with the first roller, the peak magnitude of lift of the low peak position less than the peak magnitude of lift of the high peak position; anda locking device selectively activated to prevent slidable motion between the first member and the second member causing the first member and the second member to jointly pivot about the first end to actuate the engine valve in the high-lift mode, wherein the control surface becomes disengaged from the second roller of the valve lift actuator as the cam lobe peak directly engages the cam roller of the second member, the first and second members, including the cam roller, jointly pivot about the first end and the engine valve is displaced from the closed position. 2. A finger follower apparatus to effect opening of an engine valve, comprising: an elongated base including a first end, a slidable surface, and a second end wherein the first end includes a pivot point about a valve lash adjuster and the second end includes a valve contact surface for contacting the engine valve;a control guide slidably interconnected to the slidable surface of the elongated base, the control guide including a cam roller and a control surface;a cam lobe synchronized for common rotation with engine crank rotation and configured to engage the cam roller of the control guide, the cam lobe including a cam lobe base which when engaged with the cam roller eliminates pivotal motion around the pivot point of the elongated based to operate the engine valve in a closed position comprising no lift of the engine valve, anda cam lobe peak which when engaged with the cam roller provides pivotal motion around the pivot point of the elongated base to allow the engine valve to open to a peak position;a valve lift actuator comprising a linear actuator rigidly mounted to the engine and having an extendable biasing arm connected at a distal end to a guide roller, the biasing arm including a biasing member between the linear actuator and a retention plate, wherein the biasing member is configured to bias the biasing arm in a first direction toward the elongated base; and the linear actuator selectively engaging the guide roller with the control surface of the control guide, the linear actuator selectable to linearly translate the biasing arm between a fully extended position in the first direction toward the elongated base and a fully retracted position in an opposite second direction away from the elongated base to enable continuously variable adjustment of a peak magnitude of lift during an opening profile of the engine valve, comprising the fully extended position actuating the engine valve in a high-lift mode, wherein the high-lift mode comprises the peak magnitude of lift of the engine valve at a high peak position when the cam lobe peak is engaged with the cam roller and the closed position when the cam lobe base is engaged with the cam roller,the fully retracted position actuating the engine valve in a no-lift mode comprising no lift of the engine valve, wherein the no-lift mode comprises the linear actuator controlled to overcome the biasing member such that the biasing arm linearly translates to the fully retracted position as engagement between the cam lobe and the cam roller translationally slides the control guide along the elongated base in the second direction while the control surface of the control guide is engaged to the guide roller, the linear translation of the biasing arm to the fully retracted position prevents any occurrence of lift of the engine valve regardless of the engagement between the cam roller and each of the cam lobe peak and the cam lobe base, andan intermediate extended position actuating the engine valve in a low-lift mode, wherein the low-lift mode comprises the peak magnitude of lift of the engine valve at a low peak position when the cam lobe peak is engaged with the cam roller and the closed position when the cam lobe base is engaged with the cam roller, the peak magnitude of lift of the low peak position less than the peak magnitude of lift of the high peak position;a locking device selectively activated to prevent motion between the control guide and the elongated base causing the elongated base and the control guide to jointly pivot about the first end to actuate the engine valve in the high-lift mode, wherein the control surface becomes disengaged from the guide roller of the valve lift actuator as the cam lobe peak directly engages the cam roller of the second member, the first and second members, including the cam roller, jointly pivot about the first end and the engine valve is displaced from the closed position. 3. The apparatus of claim 2, wherein the control surface of the control guide comprises an arcuate surface. 4. The apparatus of claim 2, wherein the control surface the control guide comprises a flat surface. 5. The apparatus of claim 2, wherein the locking device selectively prevents motion between the control guide and the elongated base at a plurality of relative positions of the control guide and the elongated base. 6. A finger follower apparatus to effect opening of an engine valve, comprising: a first member including first and second opposite ends, the first member being pivotally fixed at the first end and operatively engaged with the engine valve at the second end;a second member slidably engaged with the first member, the second member including a cam roller for engagement with a cam and a control surface, wherein the control surface comprises an arcuate surface;a cam lobe synchronized for common rotation with engine crank rotation and configured to engage the cam roller, the cam lobe including a cam lobe base which when engaged with the cam roller eliminates pivotal motion around the first end of the first member to operate the engine valve in a closed position comprising no lift of the engine valve, anda cam lobe peak which when engaged with the cam roller provides pivotal motion around the first end of the first member to allow the engine valve to open to a peak position;a valve lift actuator comprising a linear actuator rigidly mounted to the engine and having an extendable biasing arm connected at a distal end to a guide roller, the biasing arm including a biasing member between the linear actuator and a retention plate, wherein the biasing member is configured to bias the biasing arm in a first direction toward the first member;the linear actuator selectively engaging the guide roller with the control surface of the second member, the linear actuator selectable to linearly translate the biasing arm between a fully extended position in the first direction toward the first member and a fully retracted position in an opposite second direction away from the first member to enable continuously variable adjustment of a peak magnitude of lift during an opening profile of the engine valve, comprising the fully extended position actuating the engine valve in a high-lift mode, wherein the high-lift mode comprises the peak magnitude of lift of the engine valve at a high peak position when the cam lobe peak is engaged with the cam roller and the closed position when the cam lobe base is engaged with the cam roller,the fully retracted position actuating the engine valve in a no-lift mode comprising no lift of the engine valve, wherein the no-lift mode comprises the linear actuator controlled to overcome the biasing member such that the biasing arm linearly translates to the fully retracted position as engagement between the cam lobe and the cam roller translationally slides the second member along the first member in the second direction while the control surface of the second member is engaged to the guide roller, the linear translation of the biasing arm to the fully retracted position prevents any occurrence of lift of the engine valve regardless of the engagement between the cam roller and each of the cam lobe peak and the cam lobe base, andan intermediate extended position actuating the engine valve in a low-lift mode, wherein the low-lift mode comprises the peak magnitude of lift of the engine valve at a low peak position when the cam lobe peak is engaged with the cam roller and the closed position when the cam lobe base is engaged with the cam roller, the peak magnitude of lift of the low peak position less than the peak magnitude of lift of the high peak position; anda locking device selectively activated to prevent slidable motion between the first member and the second member causing the first member and the second member to jointly pivot about the first end to actuate the engine valve in the high-lift mode, wherein the control surface becomes disengaged from the guide roller of the valve lift actuator as the cam lobe peak directly engages the cam roller of the second member, the first and second members, including the cam roller, jointly pivot about the first end and the engine valve is displaced from the closed position.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (9)
Chinh T. Nguyen, Cam actuated continuous simultaneously variable valve timing and lifting assembly.
Kanamaru, Masanobu; Fuwa, Naohide; Eiraku, Akira; Kinoshita, Gohki; Hakariya, Masashi; Yamanashi, Takahiro, Control apparatus and method for valve actuating system of internal combustion engine.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.