Chain tensioning mechanism of chain saw and assembly method of chain saw with such mechanism

Abstract

The invention provides a chain tensioning mechanism of a chain saw. The chain tensioning mechanism comprises a housing, a chain saw guide plate, an adjusting bolt and a lever; a driving chain wheel is arranged in the housing; the chain saw guide plate is in slide fit with the housing, and a sliding direction of the chain saw guide plate is perpendicular to and intersects an axis of the driving chain wheel; the adjusting bolt is in threaded connection with the housing, and an axis of the adjusting bolt forms an included angle with the sliding direction of the chain saw guide plate; the lever is rotationally mounted in the housing; a head portion of the lever is connected with the adjusting bolt, while a tail portion of the lever is connected with the chain saw guide plate; and when the adjusting bolt is tightened, the lever pushes the chain saw guide plate to move towards a side far away from the driving chain wheel. Meanwhile, the present invention also provides an assembly method of a chain saw. The chain tensioning mechanism of the chain saw provided by the present invention is simple and compact in structure, convenient to operate, good in tensioning effect and reliability, and not prone to slip, thereby greatly improving the safety.

Description

technical field [0001] The invention relates to a chain saw, in particular to a chain saw chain tensioning mechanism and an assembly method of the chain saw with the mechanism. Background technique [0002] A chainsaw is a gardening tool that uses a chain with blades to drive the chain to rotate at high speed through power to cut wood or branches. If the chain is not properly tensioned, a loose chain may jump off the bar causing injury to the operator, and a chain that is too tight may cause high temperature failure due to excessive friction between the chain and the bar. Also during use, due to the wear and tear of the chain, the tension of the chain changes considerably. After a period of use, the length of the chain gradually increases and its tension decreases. [0003] At present, the existing known chain tensioning methods are roughly divided into two categories. One type requires the use of one or more special tools to directly or indirectly rotate the adjusting scre...

AI Technical Summary

Problems solved by technology

[0004] Including sprocket seat, cover plate, sprocket, guide plate, chain, adjustment knob, tooth condition, adjustment gear, the adjustment knob is limited on the cover plate and can rotate relative to the cover plate, the adjustment gear is fixed on the lower part of the adjustment knob, the bolt After going through the adjusting gear and the adjusting knob in turn, it is threadedly connected with a locking knob that can compress the adjusting knob. The upper surface of the adjusting knob has a recess, and the lower surface of the recess has a hole for the bolt to pass through. The lower part of the locking knob is accommodated in the In the concave part, it can be rotated relative to the adjusting knob. After the bolt passes through the hole on the concave part, it is threadedly connected with the locking knob. A locking insert is fixed at the lower part of the locking knob. hole, the lower part of the locking insert protrudes from the lower end surface of the locking knob, and the lower part of the locking insert enters the hole in the recess and can contact the upper end surface of the adjustment gear; when adjusting, first rotate the locking knob, and then rotate the adjustment The operation is too complicated, and it is often necessary to repeatedly adjust between the two knobs. It is necessary to check the manual or under the guidance of a professional to complete the locking. It is very easy to cause the saw chain to loosen and be damaged due to improper operation. Chainsaws even endanger personal safety

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