Cylinder deactivation engine

Patent metadata

Field	Value
Publication number	US-2016160701-A1
Application number	US-201514724513-A
Country	US
Kind code	A1
Filing date	May 28, 2015
Priority date	Dec 9, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

A cylinder deactivation engine may include: one or more deactivation cylinders to be selectively deactivated; one or more non-deactivation cylinders not to be deactivated; cylinder deactivation apparatuses operably connected to the deactivation cylinders and operated by hydraulic pressure to selectively implement a zero lift of a valve or valves of the deactivation cylinders; one or more variable valve lift apparatuses operably connected to the non-deactivation cylinders and operated by the hydraulic pressure to selectively change a lift of a valve of the non-deactivation cylinders; a hydraulic pump that generates the hydraulic pressure for operating the variable valve lift apparatuses and the cylinder deactivation apparatuses; and one or more oil control valves that control the hydraulic pressure from the oil pump so that the hydraulic pressure is selectively supplied to the variable valve lift apparatuses and the cylinder deactivation apparatuses.

First claim

What is claimed is:

1 . A cylinder deactivation engine comprising:
one or more deactivation cylinders to be selectively deactivated; one or more non-deactivation cylinders not to be deactivated; cylinder deactivation apparatuses operably connected to the one or more deactivation cylinders and operated by hydraulic pressure to selectively implement a zero lift of a valve or valves of the one or more deactivation cylinders; one or more variable valve lift apparatuses operably connected to the one or more non-deactivation cylinders and operated by the hydraulic pressure to selectively change a lift of a valve of the one or more non-deactivation cylinders; a hydraulic pump that generates the hydraulic pressure for operating the one or more variable valve lift apparatuses and the cylinder deactivation apparatuses; and one or more oil control valves that control the hydraulic pressure from the oil pump so that the hydraulic pressure is selectively supplied to the one or more variable valve lift apparatuses and the cylinder deactivation apparatuses.

2 . The cylinder deactivation engine of claim 1 , wherein each cylinder deactivation apparatus is disposed at an intake part to operate an intake valve of a corresponding deactivation cylinder or at an exhaust part to operate an exhaust valve of the corresponding deactivation cylinder.

3 . The cylinder deactivation engine of claim 2 , wherein each variable valve lift apparatus is disposed at the intake part to operate the intake valve of a corresponding non-deactivation cylinder.

4 . The cylinder deactivation engine of claim 3 , wherein the oil control valve communicates with two cylinder deactivation apparatuses provided for each of the one or more deactivation cylinders and with one variable valve lift apparatus provided for each of the one or more non-deactivation cylinders.

5 . The cylinder deactivation engine of claim 3 , wherein the variable valve lift apparatus includes:
an outer body that selectively pivots with rotation of a cam, has a first end connected with the intake valve of the corresponding non-deactivation cylinder and a second end mounted with a pivot shaft, and has an internal space; an inner body that is disposed in the internal space of the outer body and has a first end rotatably connected with the first end of the outer body; a connecting shaft that is disposed through the first end of the outer body and the first end of the outer body and connects the outer body and the inner body to each other; and a lost motion spring that returns the inner body that has rotated about the connecting shaft relative to the outer body.

6 . The cylinder deactivation engine of claim 5 , wherein:
when the hydraulic pressure is supplied to the variable valve lift apparatus, the inner body is fixed to the outer body; when the cam rotates, the inner body pivots with the outer body on a pivot shaft of the outer body; when the hydraulic pressure supplied to the variable valve lift apparatus is removed, the inner body is unfixed from the outer body; and when the cam rotates, the inner body pivots on the connecting shaft.

7 . The cylinder deactivation engine of claim 6 , wherein:
the variable valve lift apparatus further includes a latching pin and a latching spring disposed in the outer body; when the hydraulic pressure is supplied to the variable valve lift apparatus, the inner body is fixed to the outer body by the latching pin; and when the hydraulic pressure supplied to the variable valve lift apparatus is removed, the latching pin is returned by the latching spring, and the inner body and the outer body are unfixed.

8 . The cylinder deactivation engine of claim 6 , wherein:
when the outer body pivots with the inner body, a high lift of the intake valve is implemented; and when the outer body pivots while being locked by the inner body that has pivoted on the connecting shaft, a normal lift of the intake valve is implemented.

9 . The cylinder deactivation engine of claim 5 , wherein:
the inner body is formed with an internal space of the inner body; and the variable valve lift apparatus further includes a roller that is disposed in the internal space of the inner body, is rotatably connected to the inner body, and is in rolling contact with the cam so that the inner body pivots with the rotation of the cam.

10 . The cylinder deactivation engine of claim 3 , wherein the cylinder deactivation apparatus includes:
an outer body that selectively pivots with rotation of a cam, has a first end connected with the intake or exhaust valve of the corresponding deactivation cylinder and a second end mounted with a pivot shaft, and has an internal space; an inner body that is disposed in the internal space of the outer body and has a first end rotatably connected with the first end of the outer body; a connecting shaft that is disposed through the first end of the outer body and the first end of the outer body and connects the outer body and the inner body to each other; and a lost motion spring that returns the inner body that has rotated about the connecting shaft relative to the outer body.

11 . The cylinder deactivation engine of claim 10 , wherein:
when the hydraulic pressure supplied to the cylinder deactivation apparatus is removed, the inner body is fixed to the outer body; when the cam rotates, the inner body pivots with the outer body on a pivot shaft of the outer body; when the hydraulic pressure is supplied to the cylinder deactivation apparatus, the inner body is unfixed from the outer body and only the inner body pivots on the connecting shaft with the rotation of the cam.

12 . The cylinder deactivation engine of claim 11 , wherein:
the cylinder deactivation apparatus further include a latching pin and a latching spring disposed in the outer body; when the hydraulic pressure supplied to the cylinder deactivation apparatus is removed, the latching pin pushed in a first direction by the latching spring fixes the outer body to the inner body; and when the hydraulic pressure is supplied to the cylinder deactivation apparatus, the latching pin is pushed in a second direction, and the inner body and the outer body are unfixed.

13 . The cylinder deactivation engine of claim 11 , wherein:
when the outer body pivots with the inner body, a normal lift of the valve is implemented; and when only the inner body pivots on the connecting shaft, a zero lift of the valve is implemented.

14 . The cylinder deactivation engine of claim 10 , wherein:
the inner body is formed with an internal space; and the cylinder deactivation apparatus further includes a roller that is disposed in the internal space of the inner body, is rotatably connected to the inner body, and is in rolling contact with the cam so that the inner body pivots with the rotation of the cam.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Choi Myungsik
• Kim Won Gyu
• Kwak Young Hong
• Kim Wootae

Classifications

• F01L1/18

  Rocking arms or levers · CPC title

• F02D17/02 Primary

  Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) · CPC title

• F01L13/00

  Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations · CPC title

• F01L13/0005 Primary

  Deactivating valves · CPC title

• F02D13/02

  during engine operation · CPC title