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Switchable cam follower

An adjustable, external rocker arm technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve problems such as high wear and tear, and achieve the effect of reducing wear and saving costs

Active Publication Date: 2013-07-31
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in an undesirably high wear of the winding in the region of the segment-shaped contact on the bushing

Method used

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Examples

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Embodiment Construction

[0021] An adjustable rocker arm 1 of a valve train of an internal combustion engine is shown with an elongated outer rocker arm part 3 , the inner rocker arm part 2 being distributed between the arms of the outer rocker arm part 3 .

[0022] The rocker arm 1 has an abutment 6 for a gas exchange valve on the underside 4 of one end 5 . At the other end 7 the outer rocker part 3 has on the underside 4 a complementary surface 8 for bearing on the head of the support element.

[0023] The rocker arm 1 has, on its upper side 9 of the inner rocker arm part 2 , a running surface 10 designed here as a roller for the large-stroke cam. In contrast, the running surface 11 for the short-stroke cam, which is designed as a sliding surface, is arranged on the outer rocker arm part 4 . In the region of the other end 7 a coupling mechanism 12 which is displaceable longitudinally and not further described is used.

[0024] Furthermore, it can be seen that the rocker parts 2 , 3 are distributed...

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PUM

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Abstract

A switchable cam follower (1) of a valve train of an internal combustion engine is proposed. The switchable cam follower (1) has an inner lever and an outer lever (2, 3), wherein the levers (2, 3) can be connected to each other via coupling means (12) and run on a common pin (15) such that they can be moved pivotably relative to each other; the pin (15) is projected around by at least one group of turns (16) of a swivel pin spring (17) as cam restoring spring; a first limb (19) which protrudes from an end side (18) of the group of turns (16) acts on a first clamping point (20) of the outer lever (3) and a second limb (22) which protrudes from another end side (21) of the group of turns (16) acts on a second clamping point (23) of the inner lever (2), in the rotational direction in such a way that the levers (2, 3) are present such that they are stressed towards each other; the pin (15) runs in a ''floating'' manner with respect to the holes (13, 14); the group of turns (16) comprises a bush (24) with play; axial fixing of the pin (15) is produced via the offset contact of the group of turns (16) on the bush (24), wherein offset contact is brought about by the system stressing, and therefore the offset contact of said bush (24) on the pin (13); in order to reduce a resulting contact force (FR) in the region of the contact of the group of turns (16) on the bush (24), the clamping points (20, 23) of the two limbs (19, 22) of the group of turns (16) are positioned in such a way that an angle (a) which is enclosed by intersecting force vectors at the clamping points (20, 23) [direction of action of the two contact forces (F1, F2)] lies in the range (90 DEG<alpha < 180 DEG ).

Description

technical field [0001] The invention relates to an adjustable rocker arm of a valve train of an internal combustion engine with an inner rocker part and an outer rocker part, wherein the rocker has an abutment for a gas exchange valve on the underside of one end, Whereas at the other end there is a complementary face for the support element, and one of the rocker parts has a running face on the upper side for a large-stroke cam and the other rocker part has a running face for a small-stroke or zero-stroke cam , wherein the rocker arm parts are connectable to one another via a coupling mechanism and are distributed pivotably relative to one another on a common shaft via a bore, the shaft being surrounded by at least one winding of a rotary torsion spring as a cam return spring, wherein the winding is composed of A first leg protruding at the end side acts on a first locking point of the outer rocker part and a second leg protruding from the other end of the winding acts on a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/18F01L13/00
CPCF01L1/185F01L1/181F01L13/0005Y10T74/2107Y10T74/20882
Inventor 罗尼·京内尔诺伯特·尼茨
Owner SCHAEFFLER TECH AG & CO KG
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