Patent ID: 11933201
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A valve timing adjustment device comprising:
a first rotating body that has a bottomed cylindrical shape with a plurality of operating hydraulic chambers inside, a bottom of the bottomed cylindrical shape being penetrated by a distal end of a camshaft, and has an opening closed by a disk-shaped plate;
a second rotating body that has a vane that divides each of the operating hydraulic chambers into an advanced angle side and a retarded angle side, is disposed inside the first rotating body, is fixed to the distal end of the camshaft, relatively rotates with respect to the first rotating body, has a substantially columnar shape, forms the vane having a protruding shape on an outer periphery of the substantially columnar shape, and has a through hole forming a two-surface width portion on a central axis of the substantially columnar shape;
a holder that is disposed on the axis of the second rotating body outside the plate of the first rotating body, has a substantially cylindrical shape, and is fixed to the second rotating body with a two-surface width formed by two opposing sides of a polygonal shape of an outer peripheral surface of the substantially cylindrical shape;
a protrusion-shaped rib disposed outside the plate of the first rotating body and protruding from the first rotating body; and
a spiral assist spring that is disposed outside the plate of the first rotating body, has an outer peripheral end portion fixed to the first rotating body, has an innermost periphery and an inner peripheral end portion wound around an outer periphery of the holder and fixed to the second rotating body, and biases the second rotating body in one direction with respect to the first rotating body, wherein
in the assist spring, the inner peripheral end portion is formed in a non-bent shape, an outer side of an outermost periphery is in contact with the rib, a second winding is in contact with the inner peripheral end portion, and there is no contact between windings from the second winding to the outermost periphery.