Automatic compression release mechanism

Abstract

An automatic compression release mechanism for implementation in an internal combustion engine, and a method of assembling such a mechanism, are disclosed. The mechanism includes a camshaft assembly including a cam gear (320), a cam lobe (360) with a notch positioned along a first side of the gear (320), a tube (550) passing through the gear (320) and aligned with the notch (580), and a support on a second side of the gear. The mechanism additionally includes an arm (510) including a weight (530) and shaft (540) coupled to one another, where an end of the shaft (540) includes a recess (620), and where the shaft is rotatably positioned within the tube and the end of the shaft with the recess extends into the notch. The mechanism further includes a retaining member positioned onto the support so that the weight is positioned between the retaining member and the tube and retained with respect to the gear.

Description

Technical field [0001] The present invention relates to internal combustion engines, and more particularly to automatic compression and release mechanical devices used in internal combustion engines. Background technique [0002] Automatic compression and release mechanisms are used in internal combustion engines to improve engine performance at various engine speeds. Such a mechanical device typically includes a component driven based on the speed of the internal combustion engine, which continuously changes the characteristic outer surface of the cam lobe, and a push rod controls the exhaust valve of the engine along the cam lobe. Specifically, when the engine is at a low speed, such as during the start of the engine, a protrusion is generated on the cam lobe so that the exhaust valve tends to open slightly during the compression stroke of the engine, which facilitates the engine Start. However, when the engine is at a higher speed, such as during normal operation of the engine...

AI Technical Summary

Problems solved by technology

Thus, retention of the counterweight shaft on this cam arrangement can become problematic

In particular, a shackle or other simple means of attaching to the end of the shaft to hold the shaft in position relative to the cam arrangement cannot be effectively utilized unless the shaft extends beyond the cam lobe, which would make the shaft too Long and fragile, and increases manufacturing cost (especially where powdered metal techniques are required to machine the shaft)

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