Abstract:
Intake and exhaust rotary valves (10, 10', 20; 110, 110', 120; 210, 210') are separately disposed in intake and exhaust passages (7, 7', 8, 8'; 107, 108) communicating with a combustion chamber (6; 106) in an internal combustion engine (1; 101), respectively, and are adapted to open and close the corresponding intake and exhaust passages. These rotary valves have spherical valve bodies (13, 13', 23; 113, 113', 123; 213, 213'). A valve operating system (30) for rotatively driving the valve bodies interlockingly with the movement of a piston (5; 105) in the internal combustion engine (1; 101) has drive shaft (34, 36; 134; 234) each of which is connected to the valve body through a connecting member (17, 18; 117, 118; 217, 218). In case a plurality of the intake and exhaust rotary valves are mounted, the valve bodies of the intake rotary valves as well as the valve bodies of the exhaust rotary valves are also interconnected through connecting members.
Abstract:
A rotary valve system for an internal combustion engine having ball-type valves with through bores. The valves are driven by rocking cam mechanisms within passageways for controlling communication through intake and exhaust passages. Valve seats are arranged to either side of the valves such that sealing thereof may occur. In one embodiment, side cut portions are employed to allow either intake or exhaust gases to flow around the valve body as well as through the through bore when the valve is in the opening or closing orientation. In another embodiment, a through bore of square cross section is provided to increase flow during opening and closing thereof. In a third embodiment, a bias mechanism is employed to provide torque on the valves and drive mechanism to eliminate clearances such that impact between components will be reduced or eliminated.
Abstract:
In an internal combustion engine in which intake and exhaust rotary valves each having a spherical valve body are controlled in opening and closing through a valve operating mechanism interlockingly with the movement of a piston, the intake and exhaust rotary valves (10, 20; 110, 120; 210, 220; 310, 310', 320, 320') respectively assume the fully opened positions to open intake and exhaust passages (7, 8; 107, 108; 207, 208; 307, 307', 308, 308'), during the intake and exhaust strokes of the engine (1; 101; 201; 301), and assume the fully closed positions during the explosion stroke. In the fully opened and closed positions, the intake and exhaust rotary valves (10, 20; 110, 120; 210, 220; 310, 310', 320, 320') are held at a stop state for a predetermined period of time by the intermittently operating function of the valve operating mechanism (30; 130; 230; 330).
Abstract:
To smoothly perform a shift change by the actuator with a simple structure, a drive motor M as a running drive source is connected with a drive motor electronic motor unit 103 through a FET driver 107. A change motor 61 for driving a shift drum 62 is connected with a change motor electronic control unit 111 through a FET driver 112. When a drive motor electronic control unit 103 outputs the speed change signal on the basis of the detection signal of an accelerator opening sensor 106 and a drive motor rotational speed sensor 104, the output of the driver motor M is temporarily reduced or stopped to release the meshing surface pressure of the gear trains of the transmission T, and during the period thereof, a shift drum 62 is driven by the change motor 61 for performing the shift change. After completion of the shift change, the output of the drive motor M is smoothly increased.
Abstract:
A hydraulic pressure warning system for an internal combustion engine including a hydraulic pressure sensor that is prevented from being influenced by the heat of the engine and by the pulsation of an oil pump. A hydraulic pressure sensor detects hydraulic pressure in a lubricating oil passage of the engine and issues a warning based on hydraulic pressure detected by the hydraulic pressure sensor when the hydraulic pressure drops. The hydraulic pressure sensor is provided on a wall surface of a water jacket of a rear cylinder block so as to project therefrom.
Abstract:
A twin clutch gear transmission for a vehicle is provided for improving speed change control. The twin clutch gear transmission includes an even-numbered-gear-change gear transmission mechanism having a plurality of even-numbered gear-change gear trains which can be selectively established, and an odd-numbered-gear-change gear transmission mechanism having a plurality of odd-numbered gear-change gear trains which can be selectively established. The pair of clutches are capable of individually changing over the disconnection and the connection of power transmission between input shafts, which both gear transmission mechanisms include respectively, and a power source.
Abstract:
A valve actuating mechanism for an engine having a rocker arm movement restraining device which controls opening and closing an engine valve. The rocker arm movement restraining device includes a timing arm which engages left and right rocker arms for constraining the axial movement thereof, and a timing cam disposed on an intake-side camshaft. The rocker arm movement restraining device releases the engagement of the timing arm with the left and right rocker arms by activating the timing arm when the intake-side camshaft is rotated, and when the timing arm releases the engagement with the left and right rocker arms, the left and right rocker arms move to a predetermined operating position.
Abstract:
A variable valve characteristic mechanism has a valve operation cam pivotally supported on a camshaft and a driving mechanism rocking an interlocking mechanism around the camshaft, the interlocking mechanism rocking the valve operation cam by a driving cam integrated into the camshaft. The engine valve starts to open and close in a damping portion of the valve operation cam, and the driving mechanism rocks the valve operation cam via the interlocking mechanism, thereby controlling an opening timing and a closing timing of the engine valve. A cam swelled portion of the driving cam has a constant velocity portion in which a lift velocity is constant, and the constant velocity portion is provided over an angular width where the opening timing in a most advanced angle position of the opening timing of the engine valve and the opening timing in a most retarded angle position of the opening timing are included.
Abstract:
A valve system is provided to eliminate a play at connection portions in a valve characteristic varying mechanism and to enhance the accuracy in control of valve operation characteristics.
Abstract:
A power-assisted bicycle with an auxiliary power unit that improves positional stability of a torque sensor and inhibits the position of the sensor from being misaligned, wherein the power-assisted bicycle includes an annular hollow member inserted over an outer periphery of a crankshaft and a one-way clutch disposed on the hollow member for transmitting, when a pedaling torque in a direction in which the power-assisted bicycle traveling in a forward direction, is applied to the crankshaft, and wherein a magnetic film is formed in a recess disposed in an outer periphery of the hollow member, and a magnetostrictive torque sensor is positioned and fixed by a support member for rotatably supporting the magnetostrictive torque sensor relative to the annular hollow member at both ends of the recess, such that the magnetostrictive torque sensor faces the magnetic film in the recess.