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Cam follower unit

A cam and retainer technology, which is applied to cam followers, engine components, valve drives, etc., can solve problems such as complex operations, and achieve rapid manufacturing results

Inactive Publication Date: 2016-01-27
AB SKF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Caulking solutions thus imply complex operations

Method used

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  • Cam follower unit
  • Cam follower unit
  • Cam follower unit

Examples

Experimental program
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Embodiment Construction

[0020] Cam follower unit 2 is shown in the Figure 1 to Figure 3 superior. The cam follower unit 2 comprises a tappet 20 adapted to move in a translational movement along a longitudinal axis X20 in a housing not shown. The cam follower unit 2 also comprises rollers 22 adapted to cooperate with cams, not shown, for example in valve control systems or in fuel pumps for internal combustion engines. The roller 22 is rotatably mounted on a cylindrical pin 24 which is inserted into a central hole 220 of the roller 22 . The roller 22 is adapted to rotate about an axis X22 substantially perpendicular to the axis X20.

[0021] The tappet 20 comprises two side lugs 200 and 202 extending parallel to the axis X20 and perpendicular to the axis X22. Each ear 200 and 202 includes a circular hole 204 into which a pin 24 is inserted.

[0022] In order to retain the pin 24 in the ears 200 and 202 along the axis X22 corresponding to the longitudinal direction of the pin 24 , the cam follower...

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PUM

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Abstract

The invention provides a new cam follower unit in which the axial retaining of the pin is realized with simpler and less costly means than in the prior art. The cam follower unit comprising a tappet, a roller adapted to cooperate with a cam, the roller being mounted rotatably on a pin which is mounted in holes provided on two lateral ears of the tappet, the pin being retained in the tappet, in the longitudinal direction of the pin, by elastic spring retainers mounted against the ends of the pin, inside the holes of the lateral ears. The elastic spring retainers comprise a central portion adapted to be in contact with ends of the pin, the central portion defining a plane perpendicular to the central axis of the pin, and a peripheral portion adapted to exert a radial elastic force against an internal wall of the circular holes. The peripheral portion extends outwardly from the central portion and away from the pin along directions inclined with respect to the plane defined by the central portion.

Description

technical field [0001] The present invention relates to a cam follower unit. Background technique [0002] The cam follower unit comprises a tappet and a roller adapted to cooperate with the cam, said roller being rotatably mounted on a pin mounted in a hole provided in a side ear of the tappet. [0003] It is known to retain the pin in the tappet in the longitudinal direction of said pin with elastic rings or circlips fitted in grooves provided on the inner wall of the hole of the side lug. Such grooves are difficult to obtain by turning and therefore involve high costs. [0004] It is also known to retain the pin in the tappet by caulking. This technique requires deformation to be performed on the end of the pin that abuts against the tappet lug, which is also deformed and can be damaged. Furthermore, when a pin is subjected to an induction hardening treatment, such treatment must be performed only on a localized portion of the pin in order to allow deformation of its e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/04F01L1/14F02M59/10
CPCF01L1/14F01L1/46F02M59/102F16H53/06F01L2305/02Y10T74/2107
Inventor B.豪维斯普雷S.维奥尔特N.贝鲁特F.尚帕洛
Owner AB SKF