Patent ID: 8935856
Filing Date: 2015-01-20
Classification: B27B,F02F

Abstract:
1. A chain saw comprising: an engine having: a housing; and a guide bar, around which a saw chain is to be wound so as to be rotated by the engine, the guide bar being attached to the housing at an attaching position, wherein a center axis of the cylinder is inclined with respect to a plane passing through the crank shaft and a center portion of the guide bar in a width direction of the guide bar in such a manner that a rear part of the engine is disposed downwardly with respect to a front part of the engine, wherein the housing is integrally formed with a side surface where the guide bar is attached to the attaching position, and upper and lower surfaces which are adjacent to the side surface, wherein the housing includes an engine receiving portion that (i) defines an opening to a second side surface which is opposite to the side surface where the guide bar is attached to the attaching position and (ii) is configured to receive the engine through the opening, wherein the engine is arranged in the housing so that the crankshaft of the engine protrudes from the side surface, wherein the engine has two surfaces substantially parallel to a longitudinal axis direction of the crankshaft and a central axis direction of the cylinder, the two surfaces being covered with and fixed to a respective one of the upper and lower surfaces of the housing, wherein the upper surface of the housing includes an upper fixing portion by which an upper surface of the engine is fixed to the upper surface of the housing and the lower surface of the housing includes a lower fixing portion by which a lower surface of the engine is fixed to the lower surface of the housing, the upper fixing portion and the lower fixing portion being configured such that the upper fixing portion is disposed closer to the crank shaft in the center axis of the cylinder than the lower fixing portion, wherein the engine is further fixed to the housing with a fixing member at the side surface at a fixing position, and the fixing position is located between the attaching position of the guide bar to the housing and the crankshaft in a longitudinal direction of the guide bar, and wherein, as viewed from the longitudinal axis direction of the crankshaft, the fixing member is positioned inside a rotational path of the saw chain defined by the guide bar.