Valve timing regulation apparatus for engine
First Claim
1. A valve timing regulation apparatus for an internal combustion engine, said internal combustion engine including a drive shaft, a driven shaft and a valve for intake or exhaust, the apparatus comprising:
- a drive force transmission member provided to transmit a drive force of the drive shaft to the driven shaft for opening and closing the valve of the internal combustion engine wherein the drive shall and the driven shaft are relatively rotated by the drive force transmission member to regulate opening and closing timing of the valve;
a drive-side rotor rotatable along with the drive shaft;
a driven-side rotor rotatable along with the driven shaft; and
a spring arranged to urge the driven-side rotor in a direction to advance the driven shaft with respect to the drive shaft, wherein a torque on the driven shaft derived by the force of the spring is set to be at least one of;
greater than the maximum torque transmitted to the drive shaft from the driven shaft at the time of start of the internal combustion engine and greater than the average torque transmitted to the drive shaft from the driven shaft at the time of start of the internal combustion engine.
1 Assignment
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Accused Products
Abstract
For enhancing engine startability and reducing discharge of unburned fuel from an engine, a camshaft is rotated toward the most advance side when an exhaust valve is opened. In one aspect, the camshaft is urged toward the advance side with respect to a timing pulley by the urging force of a spring. A stopper is received displaceably in a diametrical direction in a receiving hole and is fitted in a stopper hole when the camshaft is at the most advance position. In another aspect, at engine starting where operating fluid is not supplied to a release fluid chamber, a clutch piston is coupled to a front plate by a spring, and gear teeth of the front plate and the clutch piston are engaged with each other.
42 Citations
10 Claims
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1. A valve timing regulation apparatus for an internal combustion engine, said internal combustion engine including a drive shaft, a driven shaft and a valve for intake or exhaust, the apparatus comprising:
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a drive force transmission member provided to transmit a drive force of the drive shaft to the driven shaft for opening and closing the valve of the internal combustion engine wherein the drive shall and the driven shaft are relatively rotated by the drive force transmission member to regulate opening and closing timing of the valve; a drive-side rotor rotatable along with the drive shaft; a driven-side rotor rotatable along with the driven shaft; and a spring arranged to urge the driven-side rotor in a direction to advance the driven shaft with respect to the drive shaft, wherein a torque on the driven shaft derived by the force of the spring is set to be at least one of;
greater than the maximum torque transmitted to the drive shaft from the driven shaft at the time of start of the internal combustion engine and greater than the average torque transmitted to the drive shaft from the driven shaft at the time of start of the internal combustion engine.
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2. A valve timing regulation apparatus for an internal combustion engine having a drive shaft, a driven shaft and a valve for intake or exhaust, the apparatus comprising:
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a drive force transmission member provided to transmit a drive force of the drive shaft to the driven shaft for opening and closing the valve of the internal combustion engine so that the drive shaft and the driven shaft are relatively rotated by the drive force transmission member to regulate opening and closing timing of the valve; a drive-side rotor rotatable along with the drive shaft; a driven-side rotor rotatable along with the driven shaft; and first urging means to urge the driven-side rotor in a direction to advance the driven shaft with respect to the drive shaft, wherein a torque on the driven shaft derived by urging force of the first urging means is set greater than the maximum torque transmitted to the driven shaft from the drive shaft at the time of stat of the internal combustion engine. - View Dependent Claims (8)
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3. A valve timing regulation apparatus for an internal combustion engine having a drive shaft, a driven shaft and a valve for intake or exhaust, the apparatus comprising:
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a drive force transmission member provided to transmit a drive force of the drive shaft to the driven shaft for opening and closing the valve of the internal combustion engine so that the drive shaft and the driven shaft are relatively rotated by the drive force transmission member to regulate opening and closing timing of the valves; a drive-side rotor rotatable along with the drive shaft; a driven-side rotor rotatable along with the driven shaft; and first urging means to urge the driven-side rotor in a direction to advance the driven shaft with respect to the drive shaft, wherein a torque on the driven shaft derived by the urging force of the first urging means is greater than an average torque transmitted to the driven shaft from the drive shaft at the time of start of the internal combustion engine. - View Dependent Claims (4, 5, 6, 7)
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9. A valve timing regulation apparatus for an internal combustion engine having a drive shaft, a driven shaft and a valve for intake or exhaust, the apparatus comprising:
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a drive force transmission member provided to transmit a drive force of the drive shaft to the driven shaft for opening and closing the valve of the internal combustion engine so that the drive shaft and the driven shaft are relatively rotated by the drive force transmission member to regulate opening and closing timing of the valve; a drive-side rotor rotatable along with the drive shaft; a driven-side rotor rotatable along with the driven shaft; and first urging means to urge the driven-side rotor in a direction to advance the driven shaft with respect to the drive shaft; wherein, the drive force transmission member includes gears which are divided into two or more in an axial direction or in a peripheral direction to couple with the drive-side rotor and the driven-side rotor by a helical spline, the gears being urged in the directions opposite to each other, a torque on the driven shaft derived by the urging force of the first urging means is greater than the average torque transmitted to the driven shaft from the drive shaft at the time of start of the internal combustion engine, and the sum of the torque on the driven shaft derived by the urging force of the first urging means and the torque derived by the urging force for urging the gears in the direction in which the driven-shaft advances relative to the drive shaft is greater than the maximum torque transmitted to the driven shaft from the drive shaft at the time of start of the engine. - View Dependent Claims (10)
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Specification