Valve timing regulation device

Abstract

A valve timing regulation device having a first rotating body co-rotating with a crankshaft; a second rotating body integrally fixed to an intake or exhaust camshaft; a first hole radially penetrating through a shoe formed inside the first rotating body; a second hole formed in the shoe, intersecting with the first hole; a coil spring pressing a lock pin received in the first hole to engage the lock pin with a recess formed in the outer periphery of the second rotating body; and a shaft inserted in the second hole for preventing jumping out of the coil spring.

Description

technical field [0001] The present invention relates to a valve timing regulation device for controlling the opening and closing timing of an intake valve or an exhaust valve of an internal combustion engine (hereinafter referred to as an engine) such as an engine. Background technique [0002] A conventional valve timing adjustment device includes: a first rotating body that has a housing that has a plurality of protrusion-shaped shoes (shoes) inside and that forms a hydraulic chamber between the shoes; The front cover and the rear cover of the oil pressure chamber are fixed integrally and rotate integrally with the crankshaft; The multiple blades of the chamber can rotate relatively at a predetermined angle in the first rotating body, and are integrally fixed with the intake or exhaust camshaft, and supply and discharge oil pressure to the oil pump for supplying oil to the sliding part of the engine, and use this Oil pressure is used to control the relative position of th...

AI Technical Summary

Problems solved by technology

[0006] Second, as shown in Patent Document 1, when a plate-shaped stopper is inserted into a groove formed in a direction perpendicular to the locking pin receiving hole to catch the coil spring from flying out, the processing of the groove requires high labor force. Precision

In addition, since the plate-shaped stopper is inserted into the groove after inserting the lock pin and the coil spring into the housing hole from the radially outer side, the assemblability is poor.

[0007] The third type is that when the coil spring is caught by the stop member that is pressed into the locking pin receiving hole from the radially outer side, it may fall off due to the centrifugal force in the high-speed rotation area, or it may be caused by vibration, etc. loosen and cause shedding

In addition, engineering management of press-fit force and press-fit dimensions is required

[0008] The fourth type, as shown in Patent Document 2, when using the groove wall surface of the housing to catch the coil spring flying out, the coil spring must be inserted into the escape groove together with the locking pin in a compressed state, so the assembly is poor.

[0011] Since the conventional valve timing adjustment device is structured as above, various engaging structures are used to lock the coil spring and fly out. Problems such as detachment due to centrifugal force or slack due to vibration, etc., need for engineering management of press-fit force and press-fit dimensions

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