IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0604006
(2003-06-20)
|
우선권정보 |
SE-200004870 (2000-12-22) |
발명자
/ 주소 |
- Hå
- kansson, Nils-Olof
- Berglund, Sixten
- Olsson, Gö
- ran
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
6 |
초록
▼
Method and arrangement for engine breaking in motor vehicles having an internal combustion engine with at least one cylinder, at least one exhaust valve at the cylinder and a rocker arm ( 4 ) for activation of the exhaust valve. The rocker arm ( 4 ) is arranged on a hollow rocker arm shaft ( 5 ) and
Method and arrangement for engine breaking in motor vehicles having an internal combustion engine with at least one cylinder, at least one exhaust valve at the cylinder and a rocker arm ( 4 ) for activation of the exhaust valve. The rocker arm ( 4 ) is arranged on a hollow rocker arm shaft ( 5 ) and arranged to be effected by ridges ( 2 a , 2 b , 2 c ) on a camshaft ( 2 ), the device additionally having a control valve ( 15, 16 ) for controlling the oil pressure in the rocker arm shaft ( 5 ), and means ( 6; 14 ) receptive to an increase of the oil pressure in the rocker arm shaft ( 5 ) being integrated in the rocker arm ( 4 ) for absorbing a play between the rocker arm ( 4 ) and the exhaust valve in the case of increase oil pressure. At least one of the ridges ( 2 b , 2 c ) causes opening of the exhaust valve with an engine breaking effect. The control valve ( 15 ) includes an adjustable valve body ( 18, 19 ) and a canal ( 23 ) between the valve body ( 18, 19 ) and the rocker arm shaft ( 5 ) that has a controllable exhaust ( 36 ), the valve body ( 18, 19 ) being arranged to be positioned in a first position with pressure reducing effect and a second position without pressure reducing effect.
대표청구항
▼
1. Device for engine braking in motor vehicles comprising an internal combustion engine with at least one cylinder, at least one exhaust gas valve at said cylinder and a rocker arm ( 4 ) for activation of said exhaust gas valve which rocker arm ( 4 ) is arranged on a hollow rocker arm shaft ( 5 ) an
1. Device for engine braking in motor vehicles comprising an internal combustion engine with at least one cylinder, at least one exhaust gas valve at said cylinder and a rocker arm ( 4 ) for activation of said exhaust gas valve which rocker arm ( 4 ) is arranged on a hollow rocker arm shaft ( 5 ) and arranged to be affected by ridges ( 2 a , 2 b , 2 c ) on a camshaft ( 2 ), said device additionally comprising:a control valve ( 15 , 16 ) for controlling the oil pressure in said rocker arm shaft ( 5 ), andmeans ( 6 ; 14 ), receptive to an increase of oil pressure in said rocker arm shaft ( 5 ) and integrated in said rocker arm ( 4 ) for absorbing play between said rocker arm ( 4 ) and said exhaust gas valve at increased oil pressure, with at least one of said ridges ( 2 b , 2 c ) then causing opening of the exhaust gas valve with an engine braking effect, wherein said control valve ( 15 ) comprises a controllable valve body ( 18 , 19 ) and a canal ( 23 ) between the valve body ( 18 , 19 ) and the rocker arm shaft ( 5 ) which comprises a controllable outlet ( 36 ), with the valve body ( 18 , 19 ) being arranged to be positioned in a first position with a pressure reducing effect, and a second position without a pressure reducing effect. 2. Device according to claim 1, wherein the control valve ( 15 , 16 ) is arranged for said control of oil pressure depending on a signal generated when there is a need for gear shifting of a gearbox associated with the engine, with said valve body ( 18 , 19 ) being arranged to be positioned in said first and second position respectively, depending on said signal. 3. Device according to claim 1, wherein a control valve ( 28 ) is arranged in connection to said controllable outlet ( 36 ), and is arranged for opening alternatively closing of said outlet ( 36 ). 4. Device according to claim 3, wherein said control valve ( 28 ) is arranged to assume two states:a first state where the outlet ( 36 ) is open, with the canal ( 23 ) communicating with a chamber ( 22 ), the oil content of which exerts a force against the valve body ( 18 , 19 ) which corresponds to said first position of the valve body ( 18 , 19 ), anda second position where the outlet ( 36 ) is closed, with said chamber ( 22 ) communicating with a drainage outlet ( 29 ) for oil, which corresponds to said second position of the valve body ( 18 , 19 ). 5. Device according to claim 3 wherein said controllable valve ( 28 ) consists of an electrically controlled solenoid valve. 6. Device according to claim 3 wherein said valve body ( 18 , 19 ) is arranged in a holder ( 20 ) in such a way that a pressure reducing slit is defined at said first position of the valve body ( 18 , 19 ). 7. Device according to claim 3 wherein the control valve device ( 15 , 16 ) comprises a throttle valve ( 16 ) with valve devices ( 24 , 25 , 26 ) to trap an oil volume in connection to said means ( 6 ; 14 ) in case of increased oil pressure. 8. Device according to claim 7, wherein said valve devices ( 24 , 25 , 26 ) comprise a ball ( 24 ) which, with a ball seat ( 25 ), defines a controllable opening for oil, and a spring element ( 26 ) which in the case of increased oil pressure influences said ball ( 24 ) to be in contact with the ball seat ( 25 ). 9. Device according to claim 7, wherein said canal ( 23 ) exhibits a first cross-section area, and said controllable outlet ( 36 ) exhibits a second cross-section area, wherein the ratio between said first cross-section area and said second cross-section area is within the interval 1 - 5 . 10. Device according to claim 7, wherein said canal ( 23 ) exhibits a diameter in the order of size 5-15 mm, and in that said controllable outlet ( 36 ) exhibits a diameter in the order of size of 2-10 mm. 11. Device according to claim 7 wherein the dimensions of said controllable outlet ( 36 ) are chosen so that there is essentially no time delay obtained when pressurizing and depressurizing in said controllable outlet ( 36 ) c ompared to the corresponding pressurization and depressurization of said canal ( 23 ). 12. Method for engine braking of motor vehicles comprising an internal combustion engine with at least one cylinder, at least one exhaust gas valve at said cylinder, and a rocker arm ( 4 ) for activation of said exhaust gas valve, which rocker arm ( 4 ) is arranged on a hollow rocker arm shaft ( 5 ) and arranged to be influenced by ridges ( 2 a , 2 b , 2 c ) on a camshaft ( 2 ), with said method comprising:controlling the oil pressure of said rocker arm shaft ( 5 ), and increasing the oil pressure in said rocker arm shaft ( 5 ) and integrated in said rocker arm ( 4 ) for absorbing play between said rocker arm ( 4 ) and said exhaust gas valve in the case of increased oil pressure, with at least one of said ridges ( 2 b , 2 c ) being used for opening the exhaust gas valve with engine braking effect comprises:control of a valve ( 15 ) which comprises a controllable valve body ( 18 , 19 ) and a canal ( 22 ) between the valve body ( 18 , 19 ) and the rocker arm shaft ( 5 ) which comprises a controllable outlet ( 36 ),with said control comprising positioning of the valve body in a first position with pressure reducing effect, and a second position without pressure reducing effect.
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