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US 2025/0146429 A1Published application
A phase change system for opening and/or closing intake valves
AssigneePiaggio & C. S.P.A.
InventorWalter MARIOTTI
Life of this patent
Estimating the term…
Abstract
A phase change system for opening and/or closing at least an intake valve in the internal combustion engine of a saddle vehicle. comprising a rocker pivoting around a pivot axis and adapted to transform the rotary motion of a camshaft into a motion for opening/closing at least an intake valve of the engine. and a selecting member adapted to interact with the rocker so that this latter takes different operative configurations to postpone or to advance the opening/closing of the intake valve.
Claims13
A phase change system for opening and/or closing at least an intake valve in the internal combustion engine of a saddle vehicle, the phase change system comprising:
- a rocker pivoting around a pivot axis and adapted to transform the rotary motion of a camshaft of the engine into a motion for opening/closing at least an intake valve of the engine;
- and
- a selecting member adapted to interact with the rocker so that the rocker takes different operative configurations to postpone or to advance the opening/closing of the intake valve,
- and wherein the rocker comprises at least three arms, a first arm articulated around the pivot axis and provided with an area of interaction with the intake valve to allow actuating the valve, and at least a second and a third arm, both articulated around said pivot axis and provided with respective areas of interaction with the camshaft to allow the rocker to move based on the rotation of the camshaft, and wherein the at least three arms respectively define at least a first, a second and a third portion of a sliding channel for said selecting member, so that the selecting member is adapted to slide in this sliding channel so as to take at least two positions, a position adapted to make the first arm and the second arm rotate integrally around the pivot axis, and a position adapted to make the first arm and the third arm rotate integrally around the pivot axis, so that, based on the position taken by the selecting member in the sliding channel, the rocker takes different operative configurations for opening/closing the intake valve, wherein the selecting member comprises at least two axially adjacent pins sliding in the channel and provided with two respective operative ends that always touch each other, respectively at least an engagement pin for engaging the channel portions and at least an extension pin in contact with a pushing body that is at least partially external to said channel, the pushing body being adapted to push the engagement pin by thrusting the extension pin, and wherein the extension pin is adapted to slide in only one channel portion, and wherein the pushing body is a rod slidable parallel to the pivot axis.
1 more element
A single-cylinder internal combustion engine for a saddle vehicle, comprising:
- a cylinder;
- a piston sliding in the cylinder;
- a drive shaft kinematically connected to the drive shaft;
- a distribution comprising at least a intake valve for gas intake in the cylinder, at least an exhaust valve for discharging gas from the cylinder, and a camshaft;
- and
- a phase change system for opening and/or closing the intake valve of one or more of the previous claims, the phase change system comprising:
- a rocker pivoting around a pivot axis and adapted to transform the rotary motion of a camshaft of the engine into a motion for opening/closing at least an intake valve of the engine;
- and
- a selecting member adapted to interact with the rocker so that the rocker takes different operative configurations to postpone or to advance the opening/closing of the intake valve, and wherein the rocker comprises at least three arms, a first arm articulated around the pivot axis and provided with an area of interaction with the intake valve to allow actuating the valve, and at least a second and a third arm, both articulated around said pivot axis and provided with respective areas of interaction with the camshaft to allow the rocker to move based on the rotation of the camshaft, and wherein the at least three arms respectively define at least a first, a second and a third portion of a sliding channel for said selecting member, so that the selecting member is adapted to slide in this sliding channel so as to take at least two positions, a position adapted to make the first arm and the second arm rotate integrally around the pivot axis, and a position adapted to make the first arm and the third arm rotate integrally around the pivot axis, so that, based on the position taken by the selecting member in the sliding channel, the rocker takes different operative configurations for opening/closing the intake valve, wherein that the selecting member comprises at least two axially adjacent pins sliding in the channel and provided with two respective operative ends that always touch each other, respectively at least an engagement pin for engaging the channel portions and at least an extension pin in contact with a pushing body that is at least partially external to said channel, the pushing body being adapted to push the engagement pin by thrusting the extension pin, and wherein the extension pin is adapted to slide in only one channel portion, and wherein the pushing body is a rod slidable parallel to the pivot axis.
6 more elements
Dependencies are inferred from the claim text.