Intake- and/or exhaust-valve timing control system for internal combustion engines
AssigneeAtsugi Unisia Corporation
InventorsSeinosuke Hara, Seiji Tsuruta
Life of this patent
Estimating the term…
Abstract
An intake- and/or exhaust-valve timing control system for an internal combustion engine comprises a ring gear disposed between a rotating member having a driven connection with an engine crankshaft and a camshaft for changing a relative phase angle between the rotating member and the camshaft so as to control intake- and/or exhaust-valve timing of the engine depending on the operating state of the engine. The valve control system includes at least one pair of friction surfaces for creating friction torque between the rotating member and the camshaft so as to suppress a rapid change in relative rotational speed of the camshaft to the rotating member, and a spring for biasing one of the frictional surfaces to the other.
Claims14
In an intake- and/or exhaust-valve timing control system for an internal combustion engine including a phase angle changing mechanism disposed between a rotating member having a driven connection with an engine crankshaft and a camshaft for changing a relative phase angle between said rotating member and said camshaft so as to control intake- and/or exhaust valve timing of said engine depending on the operating state of said engine;
- the improvement comprising:
- means for generating frictional torque between said rotating member and said camshaft so as to suppress a rapid change in relative rotational speed of said camshaft to said rotating member;
- and
- said frictional torque generating means comprises at least one abutting pair of frictional surfaces, respectively provided on said rotating member and said camshaft, and means for press-fitting one of said frictional surfaces to the other.
In an intake- and/or exhaust-valve timing control system for an internal combustion engine including a ring gear disposed between a rotating member having a driven connection with an engine crankshaft and a camshaft for changing a relative phase angle between said rotating member and said camshaft so as to control intake- and/or exhaust-valve timing of said engine depending on the operating state of said engine;
- the improvement comprising:
- means for generating friction torque between said rotating member and said camshaft so as to suppress a rapid change in relative rotational speed of said camshaft to said rotating member;
- and
- said friction torque generating means comprising a friction member inserted into a press-fitted section between said rotating member and said camshaft to create said friction torque by two abutting pairs of friction surfaces defined between said friction member and said rotating member and between said friction member and said camshaft, and means for press-fitting said abutting friction surfaces to each other.
In an intake- and/or exhaust-valve timing control system for an internal combustion engine including a ring gear disposed between a rotating member having a driven connection with an engine crankshaft and a camshaft for changing a relative phase angle between said rotating member and said camshaft so as to control intake- and/or exhaust-valve timing of said engine depending on the operating state of said engine;
- the improvement comprising:
- means for generating friction torque between said rotating member and said camshaft so as to suppress a rapid change in relative rotational speed of said camshaft to said rotating member;
- and
- said friction torque generating means comprising a friction member having a wedge shape in cross-section, inserted into a press-fitted section between said rotating member and said camshaft to create said friction torque by two abutting pairs of friction surfaces defined between said friction member and said rotating member and between said friction member and said camshaft, and means for press-fitting said friction member into said press-fitted section.
Dependencies are inferred from the claim text.