Valve drive for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10473003-B2
Application number	US-201815942391-A
Country	US
Kind code	B2
Filing date	Mar 30, 2018
Priority date	Mar 31, 2017
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A valve drive for an internal combustion engine may include a cam shaft, at least one cam follower, and at least one adjusting device. The at least one adjusting device may include a first adjustable engagement element and a second adjustable engagement element. The first engagement element may not contact a first guide in an initial position, and may cooperate with the first guide in a switching position. The second engagement element may not contact a second guide of a slide guide in an initial position, and may cooperate with the second guide in a switching position. The at least one adjusting device may further include a switching arrangement that may include a first control element mounted to the first engagement element and a second control element mounted to the second engagement element. The first control element and the second control element may be controllable via the switching arrangement.

First claim

The invention claimed is:

1. A valve drive for an internal combustion engine, the valve drive comprising:
a cam shaft and at least one cam follower;
the cam shaft including at least one cam group mounted to the cam shaft in a rotationally fixed manner, the at least one cam group including a first cam and a second cam disposed axially adjacent to the first cam;
the at least one cam follower being drivingly connected to the first cam when in a first position and drivingly connected to the second cam when in a second position;
at least one adjusting device including a first adjustable engagement element and a second adjustable engagement element arranged next to one another at a distance on the at least one cam follower;
the first engagement element comprising a pin cooperating with a first guide of a slide guide arranged on the cam shaft, and the second engagement element comprising a pin cooperating with a second guide of the slide guide;
wherein the first engagement element and the second engagement element alternately adjust between an initial position and a switching position;
wherein the first engagement element does not contact the first guide when in the initial position, and the first engagement element cooperates with the first guide when in the switching position;
wherein the second engagement element does not contact the second guide when in the initial position, and the second engagement element cooperates with the second guide when in the switching position;
wherein the at least one adjusting device further includes a switching arrangement including a first control element mounted to the first engagement element and a second control element mounted to the second engagement element, the first control element and the second control element each including a radially outwardly extending portion that interacts with a first stop area and a second stop area of the switching arrangement, respectively, wherein the first control element and the first engagement element are controlled via the first stop area of the switching arrangement, and the second control element and the second engagement element are controlled via the second stop area of the switching arrangement such that the first engagement element and the second engagement element adjust from the initial position to the switching position; and
wherein the at least one cam follower includes at least one guide recess, in which at least one of the first control element and the second control element is arranged and guided parallel to a longitudinal axis of a corresponding one of the first engagement element and the second engagement element.

2. The valve drive according to claim 1 , wherein the at least one adjusting device includes a fastener and a counter fastener structured and arranged complementary to the fastener, and wherein at least one of the first control element and the second control element are mounted to a respective one of the first engagement element and the second engagement element via the fastener and the counter fastener.

3. The valve drive according to claim 2 , wherein:
the fastener is a through groove extending one of parallel and perpendicular to the longitudinal axis of the respective one of the first engagement element and the second engagement element; and
the counter fastener is a formation disposed complementary and integral to the through groove, the counter fastener disposed on the at least one of the first control element and the second control element.

4. The valve drive according to claim 2 , wherein one of:
the fastener is arranged on the at least one of the first control element and the second control element, and the counter fastener is arranged on e respective one of the first engagement element and the second engagement element; and
the counter fastener is arranged on the at least one of the first control element and the second control element, and the fastener is arranged on the respective one of the first engagement element and the second engagement element.

5. The valve drive according to claim 2 , wherein the fastener and the counter fastener are structured and arranged to provide a screw connection.

6. The valve drive according to claim 1 , wherein at least one of the first control element and the second control element is one of s-shaped and c-shaped.

7. The valve drive according to claim 1 , wherein the slide guide includes at least one resetting arrangement configured to adjust at least one of the first engagement element and the second engagement element into the initial position.

8. The valve drive according to claim 1 , wherein the switching arrangement is structured and arranged to pivot about an angle to control the first control element through the first stop area and to control the second control element through the second stop area in an alternating manner.

9. The valve drive according to claim 1 , wherein the switching arrangement is structured and arranged to shift along a longitudinal axis of the at least one cam follower to control the first control element and the second control element via a displacement through the first stop area and through the second stop area, respectively, in an alternating manner.

10. The valve drive according to claim 1 , wherein the switching arrangement is activated via an actuator such that at least one of the first control element and the second control element is controlled via activation of the switching arrangement.

11. The valve drive according to claim 10 , wherein the actuator is one of a hydraulic actuator, an electromagnetic actuator, and a pneumatic actuator.

12. The valve drive according to claim 1 , wherein the switching arrangement is mounted to a cylinder head.

13. The valve drive according to claim 1 , wherein the at least one guide recess includes a first guide recess structured and arranged to guide the first control element and a second guide recess structured and arranged to guide the second control element.

14. The valve drive according to claim 1 , further comprising a rocker arm rotatably mounted on a rocker arm shaft, and wherein the at least one cam follower is operatively connected to the rocker arm.

15. The valve drive according to claim 1 , wherein the switching arrangement is arranged radially between the cam shaft and the at least one cam follower relative to a rotation axis of the cam shaft.

16. A valve drive for an internal combustion engine, the valve drive comprising:
a cam shaft including at least one cam group rotationally arranged on the cam shaft, the at least one cam group including a first cam and a second cam disposed axially adjacent the first cam;
at least one cam follower being drivingly connected to the first cam when in a first position and drivingly connected to the second cam when in a second position; and
at least one adjusting device including a first engagement element and a second engagement element arranged on the at least one cam follower at a distance from one another, the first engagement element comprising a pin interacting with a first guide of a slide guide arranged on the cam shaft when in a switching position and not contacting the first guide when in an initial position, the second engagement element comprising a pin interacting with a second guide of the slide guide when in the switching position and not contacting the second guide when in the initial position;
the at least one adjusting device further including a switching arrangement including a first control element mounted to the first engagement element and a second control element mounted to the second engagement element, the fi

Assignees

• Mahle Int Gmbh

Inventors

• Altherr Patrick
• Ihne Thorsten
• Walch Markus
• Raible Silas

Classifications

• F01L2013/106

  Pneumatic motors · CPC title

• F01L1/053

  overhead type · CPC title

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L1/20

  Adjusting or compensating clearance · CPC title

• F01L13/0036

  the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction · CPC title