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Switchable cam follower for valve train of internal combustion engine

A technology of internal combustion engine and cam, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc. It can solve problems such as sudden pressure drop and unexpected switching of locking pistons, and achieve the effect of saving space

Active Publication Date: 2019-08-16
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Strong pressure drops can occur due to other consumers in the oil circuit, which lead to undesired switching of the locking piston

Method used

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  • Switchable cam follower for valve train of internal combustion engine
  • Switchable cam follower for valve train of internal combustion engine
  • Switchable cam follower for valve train of internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0034] figure 1 A switchable rocker arm 1 is shown in perspective as a cam follower for an internal combustion engine. The pendulum rocker has an outer rocker 2 , the middle part of which expands into two arms 3 . Between these arms 3 an inner rocker arm 4 extends in a pivotable manner relative to the outer rocker arm. The inner rocker arm has a roller 6 on its middle section 5 , which serves as a running surface for a camshaft, not further shown, likewise a cam, not further shown. Depending on the design of the camshaft, it is also possible to provide a cam that cooperates with the camming surface on one or both arms 3 of the outer rocker arm 2 when the inner rocker arm 4 is unlocked from the outer rocker arm 2 .

[0035] The inner rocker arm 4 has a cross member 16 at the end, which is connected to a box-like open middle section 5 delimited by two rod-shaped arms 17 . The arms 17 merge strongly towards each other towards the end 15 opposite the transverse beam into a mean...

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PUM

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Abstract

A switchable cam follower for a valve train of an internal combustion engine, comprises an outer rocker arm having two arms between which an inner rocker arm is mounted, which can be pivoted relativeto the outer rocker arm by means of a pivot axis, at least the inner rocker arm having a cam running surface on its upper side; the cam follower has on one end on its underside a contact surface for cooperation with the gas exchange valve and on its other end a contact surface for the support element. The cam follower is also provided with a pot-shaped housing opposite the pivot axis on the outerrocker arm, wherein a spring-loaded locking piston is mounted in such a way that it can be displaced essentially perpendicular to the pivot axis, which in the unlocking position separates the inner rocker arm from the outer rocker arm in terms of movement and connects them in the locking position; the cam follower is also provided with an operating mechanism for moving the locking piston. The actuating mechanism comprises an electrically operated actuator and a control shaft which is arranged on the pot-shaped housing parallel to the pivot axis and moves the locking piston into a locking or unlocking position.

Description

technical field [0001] The invention relates to a switchable cam follower for a valve drive of an internal combustion engine, in particular a pendulous rocker arm, which cam follower has an outer rocker arm with two arms between which a an inner rocker arm pivotally movable via a pivot axis relative to the outer rocker arm, wherein at least the inner rocker arm has a camming surface for at least one cam of the camshaft on its upper side, and the cam follower is on a The end has on its underside an abutment surface that cooperates with the gas exchange valve, and on its other end a contact surface for the support element, in addition, the cam follower is provided on the outer rocker arm opposite to the pivot axis In the pot-shaped housing placed, the spring-loaded locking piston is supported in the pot-shaped housing in a manner that can move substantially perpendicular to the pivot axis, and the locking piston moves the inner rocker arm in the unlocking position. Separate fro...

Claims

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Application Information

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IPC IPC(8): F01L1/18F01L13/00
CPCF01L1/185F01L13/0021F01L2001/186F01L2001/467F01L13/0005F01L2013/101F01L2800/03F01L2305/00
Inventor 拉雷什·卢杜桑安德烈·马雷什阿德里安·胡苏多鲁·格罗扎
Owner SCHAEFFLER TECH AG & CO KG