Rocker arm changeover device for engine
A switching device and engine technology, which is applied in the direction of engine components, machines/engines, valve devices, etc., can solve the problems of short length in the axis direction of the split switching pin, dumping, etc., and achieve the effect of inhibiting wear and preventing dumping
Active Publication Date: 2012-09-26
HONDA MOTOR CO LTD
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Problems solved by technology
However, in the structure of the above-mentioned Patent Document 1, the axial length of each split switching pin is short, and there is a possibility that it will fall down in the connected state.
Method used
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[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a main part perspective view showing the rocker arm mechanism part of the engine to which the present invention is applied. The engine of the illustrated example is a multi-cylinder engine, and each cylinder includes two intake valves (intake valves) 1 and two exhaust valves (exhaust valves) 2, respectively. The present invention can be applied to any one of the intake valve 1 and the exhaust valve 2 , and the intake valve 1 will be described below.
[0024] together as figure 2 As shown, each intake valve 1 is driven to open and close by the swing motion of the main rocker arm 3 for driving the valve. The middle part of the main rocker arm 3 is supported by the rocker arm shaft 4, and the main rocker arm 3 can rotate freely. Two slave rocker arms 5 and 6 arranged side by side on both sides of the main rocker arm 3 (left and right in the axial direction...
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A rocker arm changeover device is capable of preventing changeover pins from dumpage and implementing miniaturization. A major rocker arm (3) is arranged in a line with high / low lift driven rocker arms (5, 6) on two sides, each rocker arm is provided with a pin hole (21-23) coaxially, changeover pins (24-27) are arranged in the pin holes respectively in a moving manner in an axial direction, a changeover pin corresponding to the major rocker arm is composed of a great-diameter male pin (26) and a female pin (27) projectable from a pin support hole (26a) of the male pin (26). In a state of low lift, the low lift driven rocker arm is connected with the major rocker arm by the male pin, furthermore, in a state of high lift, the low lift driven rocker arm is connected with the major rocker arm by a small-diameter pin arranged on the high lift driven rocker arm in a projectable manner. Even though width of the major rocker arm is small, length of each pin (first and second pins) can be increased compared with a pin divided into two parts alone, so as to prevent from dumpage in a state of connecting through a short pin.
Description
technical field [0001] The present invention relates to a rocker arm switching device of an engine, and more particularly, to a rocker arm switching device of an engine for switching the lift amount, rest and the like of an intake valve and an exhaust valve. Background technique [0002] Conventionally, in an internal combustion engine such as a gasoline engine or a diesel engine (hereinafter, simply referred to as an engine), in order to achieve the improvement of output and fuel efficiency, and to achieve the reduction of harmful exhaust gas components, there is a need to change the intake valve and the intake valve according to the operating conditions. An internal combustion engine with door opening characteristics such as timing, lift, and rest of at least one of the exhaust valves. As a mechanism for changing the door opening characteristics, for example, there are mechanisms provided with a low-lift cam and a high-lift cam divided according to the lift amount of the v...
Claims
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IPC IPC(8): F01L13/00
CPCF01L13/0021F01L1/267F01L1/181
Inventor 林泰宇井川诚崇
Owner HONDA MOTOR CO LTD