JPH03108806U

JPH03108806U -

Info

Publication number: JPH03108806U
Application number: JP1617490U
Authority: JP
Priority date: 1990-02-22
Filing date: 1990-02-22
Publication date: 1991-11-08
Anticipated expiration: 2005-02-22
Also published as: JP2590701Y2

Description

[Brief explanation of drawings]

第１〜３図は本考案の第一実施例を示しており
、第１図は全体構成を示す、第１１図のＡ−Ａ断
面に相当する図、第２図は第１図のＢ−Ｂ断面図
、第３図は軸とローラとの分解斜視図、第４図は
潤滑性能に影響するスライスレベルと負荷比との
関係を示す線図、第５図は負荷比を説明する為、
表面の凹凸を拡大して示す断面図、第６〜７図は
本考案の第二実施例を示しており、第６図はロー
ラの斜視図、第７図はローラの内径面の拡大図、
第８図は本考案の第三実施例を示す、第１図と同
様の方向から切断した断面図、第９図はワツシヤ
の１例を示す斜視図、第１０図はエンジンの動弁
機構の１例を示す斜視図、第１１図は第１０図に
示した動弁機構に組み込んだカムフオロア装置の
側面図、第１２図は第１１図のＣ−Ｃ断面図であ
る。１……クランクシヤフト、２……カムシヤフト
、３……ロツカーアーム、４……吸気弁、５……
排気弁、６……カム、７……支持壁部、８……軸
、９……ころ、１０……ローラ、１１……通孔、
１２……内径面、１３……外径面、１４……ワツ
シヤ、１５……切り欠き。 1 to 3 show a first embodiment of the present invention, FIG. 1 shows the overall configuration and corresponds to the AA cross section in FIG. 11, and FIG. 2 shows the B-- B sectional view, Figure 3 is an exploded perspective view of the shaft and roller, Figure 4 is a diagram showing the relationship between the slice level and load ratio, which affects lubrication performance, and Figure 5 is a diagram to explain the load ratio.
6 and 7 are cross-sectional views showing enlarged surface irregularities; FIGS. 6 and 7 show a second embodiment of the present invention; FIG. 6 is a perspective view of the roller; FIG. 7 is an enlarged view of the inner diameter surface of the roller;
Fig. 8 is a sectional view taken from the same direction as Fig. 1, showing a third embodiment of the present invention, Fig. 9 is a perspective view showing an example of the washer, and Fig. 10 is a diagram of the valve mechanism of the engine. FIG. 11 is a side view of the cam follower device incorporated in the valve mechanism shown in FIG. 10, and FIG. 12 is a sectional view taken along line C-C in FIG. 11. 1...Crankshaft, 2...Camshaft, 3...Rotzker arm, 4...Intake valve, 5...
Exhaust valve, 6... cam, 7... support wall, 8... shaft, 9... roller, 10... roller, 11... through hole,
12... Inner diameter surface, 13... Outer diameter surface, 14... Washer, 15... Notch.

Claims

[Claims for Utility Model Registration] (1) A cam fixed to a camshaft that rotates in synchronization with the engine crankshaft, and a member provided opposite to this cam that receives the movement of this cam with an interval between them. a pair of supporting walls formed;
By caulking the unhardened portions at both ends toward the inner diameter surface of the through hole formed in the pair of support walls,
A cam follower device for an engine valve mechanism consisting of a steel shaft fixed across the pair of support walls and a ceramic roller rotatably supported around the shaft. The inner surface of the roller is a smooth surface with a surface roughness of 0.2 μmRa or less, and the outer surface of the shaft facing the inner surface of the roller is quenched and hardened, and at least this portion is provided with a barrel. An engine valve train that improves the oil retention performance between the outer diameter surface of the shaft and the inner diameter surface of the roller by forming fine irregularities with a surface roughness of 0.08 μmRa to 0.3 μmRa through processing. Cam follower device for mechanisms. (2) The inner surface of the roller has a surface roughness of 0.2μmR.
Instead of making it a smooth surface with a diameter of less than a, fine irregularities with a surface roughness of 0.05 to 0.8 μmRa are formed on this inner diameter surface, and on the part of the outer diameter surface of the shaft that faces the inner diameter surface of the roller, Surface roughness is 0.08μmRa~0.
2. The cam follower device for a valve train of an engine according to claim 1, wherein instead of forming fine irregularities of 3 μmRa, this portion is a smooth surface with a surface roughness of 0.2 μmRa or less. (3) The inner surface of the roller has a surface roughness of 0.2μmR.
2. The cam follower device for a valve train of an engine according to claim 1, wherein instead of having a smooth surface with a roughness of 0.05 to 0.8 μm Ra, fine irregularities are formed on the inner diameter surface. (4) The cam follower device for a valve mechanism of an engine according to any one of claims 1 to 3, further comprising washers provided between both end surfaces of the roller and inner surfaces of the pair of support walls. (5) Both end surfaces of the roller have a surface roughness of 0.2 μm.
The cam follower device for a valve train of an engine according to claim 4, wherein the cam follower device has a smooth surface with an Ra or less. (6) The cam follower device for a valve train of an engine according to any one of claims 4 to 5, wherein the washer is rotatably supported about the shaft. (7) The cam follower device for an engine valve mechanism according to claim 6, wherein a notch is provided on the inner peripheral edge of the washer. (8) The cam follower device for an engine valve mechanism according to any one of claims 4 to 7, wherein the washer is hardened by quenching. (9) The cam follower device for a valve train of an engine according to claim 8, wherein fine irregularities with a surface roughness of 0.08 μmRa to 0.3 μmRa are formed on the surface of the washer by barrel processing.