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Valve operating mechanism with roller rocker arm, 4-cycle engine, and motorcycle having 4-cycle engine mounted thereon

A transmission mechanism and valve technology, applied in the direction of engine lubrication, machine/engine, engine components, etc., can solve the problem of increased exhaust rocker load

Active Publication Date: 2006-09-13
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, the force of the cam tip pushing the roller support upward causes the exhaust rocker arm shaft to buckle (seat flexed), thereby increasing the load on the exhaust rocker arm

Method used

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  • Valve operating mechanism with roller rocker arm, 4-cycle engine, and motorcycle having 4-cycle engine mounted thereon
  • Valve operating mechanism with roller rocker arm, 4-cycle engine, and motorcycle having 4-cycle engine mounted thereon
  • Valve operating mechanism with roller rocker arm, 4-cycle engine, and motorcycle having 4-cycle engine mounted thereon

Examples

Experimental program
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Embodiment Construction

[0050] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0051] figure 1 A motorcycle 100 according to an embodiment of the present invention is shown. The motorcycle 100 includes a frame 101 . The frame 101 includes a top tube 102, left and right main frames 103 (only one of them is shown), and left and right rear arm supports 104 (only one of them is shown).

[0052]A top tube 102 is located at the front end of the frame 101 to support a front wheel 106 via a front fork 105 . The main frame 103 extends rearward of the top tube 102 and also slopes downward as it extends rearward of the top tube 102 . The main frame 103 supports a fuel tank 107 .

[0053] The rear arm bracket 104 protrudes downward from the rear end of the main frame 103 . The rear arm bracket 104 pivotably supports a rear arm 108 . The rear arm 108 extends to the rear of the rear arm support 104 . The rear wheel 109 is supported on the rear en...

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PUM

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Abstract

The invention relates to a valve operating mechanism with roller rocker arm, a 4-cycle engine, and a motorcycle having 4-cycle engine mounted thereon. A valve operating mechanism (17) comprises a cam shaft (18) having valve operating cams (25, 26), first and second rocker shafts (30, 38), a first rocker arm (19) supported by the first rocker shaft (30), and a second rocker arm (20) supported by the second rocker shaft (38). The valve operating cams (25, 26) have cam noses (27b, 28b) projecting from base circles (27a, 28a), respectively, and the first rocker shaft (30) supporting the first rocker arm (19) is positioned more forwardly of the direction of rotation of the cam shaft (18) than a centerline (O1) extending axially of a cylinder (4) through the center of the cam shaft (18). When the roller bearing (34) of the first rocker arm (19) is in contact with the base circle (27a) of the valve operating cam (25), the first rocker shaft (30) is more offset than the center of rotation (X2) of a roller bearing (34) as seen in the direction in which the cam shaft (18) is approached.

Description

technical field [0001] The invention relates to a valve train / valve train comprising a rocker arm provided with a roller support at its contact with the valve train cam; Cam-type four-stroke engine. Furthermore, the invention relates to a motorcycle on which a four-stroke engine is mounted. Background technique [0002] Four-stroke engines of the so-called SOHC (Single Overhead Camshaft) type are known, in which a single camshaft drives the exhaust and intake valves. This four-stroke engine includes an exhaust rocker arm that transmits the motion of the exhaust cam to the exhaust valves and an intake rocker arm that transmits the motion of the intake cam to the intake valves. [0003] The exhaust rocker arm and the intake rocker arm are each pivotally supported on the rocker shaft. The two rocker shafts are arranged parallel to each other with respect to the camshaft between them. Therefore, the exhaust rocker arm extends from the exhaust cam over the rocker shaft to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/18F01L1/12F01M9/08F01L1/053F01L1/08F01L1/26F01M9/10
CPCF01L1/022F01L2105/00F01L2001/0535F01L1/26F01L1/053F01M9/101F01L1/182Y10T74/2107F01L2305/00
Inventor 樱井干记
Owner YAMAHA MOTOR CO LTD
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