Variable valve device for engine

Patent metadata

Field	Value
Publication number	US-2019178117-A1
Application number	US-201816001802-A
Country	US
Kind code	A1
Filing date	Jun 6, 2018
Priority date	Dec 12, 2017
Publication date	Jun 13, 2019
Grant date	—

Abstract

A variable valve device for an engine, may include a camshaft; a movable cam device fitted over the camshaft to be slidable in an axial direction of the camshaft, and configured such that cams with at least two different cam profiles and a guide protruding portion are disposed along the axial direction of the camshaft; at least one shaft groove linearly processed to have a predetermined cross-sectional shape in an external circumferential surface of the camshaft along the axial direction thereof; a cam groove provided in an internal circumferential surface of the movable cam device to communicate with the shaft groove; and an insertion member inserted into a communication space defined by the shaft groove and the cam groove such that a rotational displacement of the camshaft is transmitted to the movable cam device.

First claim

What is claimed is:

1 . A variable valve device for an engine, the variable valve device comprising:
a camshaft; a movable cam device including a movable camshaft fitted over the camshaft to be slidable in an axial direction of the camshaft, wherein cams with at least two different cam profiles and a guide protruding portion are disposed on the movable camshaft along the axial direction of the camshaft; at least one shaft groove linearly processed on the camshaft to have a predetermined cross-sectional shape in an external circumferential surface of the camshaft along the axial direction of the camshaft; at least one cam groove provided in an internal circumferential surface of the movable cam device to communicate with the at least one shaft groove; and an insertion member inserted into a communication space defined between the at least one shaft groove and the at least one cam groove, wherein a rotational displacement of the camshaft is transmitted to the movable cam device by the insertion member.

2 . The variable valve device of claim 1 ,
wherein each of the at least one shaft groove and the at least one cam groove has a semicircular cross section, and the communication space has a circular cross section; and wherein the insertion member includes a rod with a circular cross section and being inserted into the communication space.

3 . The variable valve device of claim 1 , wherein the at least one shaft groove and the at least one cam groove are configured to form the communication space having a polygonal cross section; and
wherein the insertion member includes a rod with a cross section corresponding to the polygonal cross section defined between the at least one shaft groove and the at least one cam groove and being inserted into the communication space having the polygonal cross section.

4 . The variable valve device of claim 1 , wherein the at least one shaft groove is provided in plural and spaced with each other around the external circumferential surface of the camshaft.

5 . A variable valve device for an engine, the variable valve device comprising:
a camshaft; a movable cam device including a movable camshaft fitted over the camshaft to be slidable in an axial direction of the camshaft, wherein cams with at least two different cam profiles and a guide protruding portion are disposed on the movable camshaft along the axial direction of the camshaft; a shaft protrusion protruding from the camshaft in a direction perpendicular to the axial direction of the camshaft; and a cam groove linearly provided in an internal circumferential surface of the movable cam device along an axial direction of the movable camshaft, wherein the shaft protrusion is inserted into the cam groove.

6 . The variable valve device of claim 5 ,
wherein the camshaft is provided with a shaft pit being grooved from an external circumferential surface of the camshaft, and wherein a first end portion of the shaft protrusion is inserted into the shaft pit and locked thereto; and wherein a second end portion of the shaft protrusion is inserted into the cam groove.

7 . The variable valve device of claim 6 ,
wherein the shaft pit is in plural, the cam groove is in plural, and the shaft protrusion is in plural, and wherein a correspond shaft protrusion is disposed between a corresponding shaft pit and a corresponding carrier groove.

8 . The variable valve device of claim 7 , wherein an angle between adjacent carrier grooves is 180 degree.

9 . The variable valve device of claim 5 , wherein the camshaft is provided with a shaft hole formed by penetrating through the camshaft, and wherein a middle portion of the shaft protrusion is inserted into the shaft hole and locked to the shaft hole; and
wherein the middle portion of the shaft protrusion is locked by the camshaft in the shaft hole and opposite end portions of the shaft protrusion protrude from an external circumferential surface of the camshaft.

10 . The variable valve device of claim 9 ,
wherein the carrier groove is in plural and wherein each of the opposite end portions of the shaft protrusion are coupled to a corresponding cam groove respectively.

11 . The variable valve device of claim 10 , wherein an angle between adjacent carrier grooves is 180 degree.

12 . A variable valve device for an engine, the variable valve device comprising:
a camshaft; a movable cam device including a movable camshaft fitted over the camshaft to be slidable in an axial direction of the camshaft, and wherein cams with at least two different cam profiles and a guide protruding portion are disposed on the movable camshaft along the axial direction of the camshaft; a shaft groove linearly processed to have a predetermined cross-sectional shape in an external circumferential surface of the camshaft along the axial direction of the camshaft; a cam slider, wherein a first end portion of the cam slider is slidably inserted into the shaft groove and wherein a second end portion of the cam slider is slidably inserted into the movable cam device to slide from the movable cam device along a direction perpendicular to the axial direction of the camshaft; and an elastic member configured to elastically support the cam slider toward the camshaft.

13 . The variable valve device of claim 12 ,
wherein the movable cam device is provided on an internal circumferential surface thereof with a cam pit into which the second end portion of the cam slider is slidably mounted, to guide linear sliding movement of the cam slider in the cam pit; and wherein the cam pit is provided in a nose of each of the cams forming the movable cam device.

14 . The variable valve device of claim 13 , wherein the elastic member is disposed between the cam slider and the cam pit.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Woo Soo Hyung
• Kim Back Sik
• Han Seung Kook

Classifications

• F01L2013/101

  Electromagnets · CPC title

• F01L2013/0052

  with cams provided on an axially slidable sleeve · CPC title

• F01L13/0042 Primary

  with cams being profiled in axial and radial direction · CPC title

• F01L1/0532 Primary

  the cams being directly in contact with the driven valve · CPC title

• F01L13/0015 Primary

  for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque · CPC title