Variable valve timing camshaft

Patent metadata

Field	Value
Publication number	US-9540964-B2
Application number	US-201414542588-A
Country	US
Kind code	B2
Filing date	Nov 15, 2014
Priority date	Dec 17, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A variable valve timing camshaft which may be connected to a continuous variable valve timing apparatus having a rotor and a stator which are adapted to relatively rotate with each other and may be operated so as to vary open/close timing of valve may include a non-control camshaft coupled to the continuous variable valve timing apparatus, having a first drive gear rotating together with the rotor and a second drive gear rotating together with the stator, and rotating according to rotation of an engine without varying a phase along a circumferential direction, a control camshaft having an outer shaft rotating according to one of the first drive gear or the second drive gear, an inner shaft rotating according to the other of the first drive gear or the second drive gear, an outer cam, and an inner cam and a limiting device limiting end play of the inner shaft.

First claim

What is claimed is:

1. A variable valve timing camshaft which is connected to a continuous variable valve timing apparatus having a rotor and a stator which are adapted to relatively rotate with each other and is operated to vary open/close timing of a valve, the variable valve timing camshaft comprising:
a non-control camshaft coupled to the continuous variable valve timing apparatus, having a first drive gear rotating together with the rotor and a second drive gear rotating together with the stator, the non-control camshaft rotating according to rotation of an engine;
a control camshaft having an outer shaft rotating according to one of the first drive gear or the second drive gear, an inner shaft rotatably inserted into the outer shaft and rotating according to the other of the first drive gear or the second drive gear, an outer cam fixed to the outer shaft, and an inner cam fixed to the inner shaft, wherein a phase along a circumferential direction is varied between the outer shaft and the inner shaft according to relative rotation of the rotor and the stator; and
a limiting device limiting end play of the inner shaft, wherein the limiting device includes:
a locking pin penetrating the outer shaft along a radial direction and to be inserted into the inner shaft;
a locking groove formed along an external circumference of the inner shaft such that the locking pin is inserted thereto; and
a locking pin hole formed at the outer shaft such that the locking pin penetrates the outer shaft.

2. The variable valve timing camshaft of claim 1 , wherein the locking pin is fixed to the locking pin hole.

3. The variable valve timing camshaft of claim 2 , wherein a diameter of the locking pin hole is formed to be smaller than a diameter of the locking pin, and the locking pin is forcibly inserted into the locking pin hole.

4. The variable valve timing camshaft of claim 1 , wherein an axial direction width of the locking groove is formed to be approximately in size to a diameter of the locking pin.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Hyounghyoun

Classifications

• F01L2001/34456

  Locking in only one position · CPC title

• F01L2001/0537

  Double overhead camshafts [DOHC] · CPC title

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title

• F01L1/026

  Gear drive · CPC title

• F01L2001/0473

  Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod · CPC title