BALANCER DEVICE FOR INTERNAL COMBUSTION ENGINE AND ITS ASSEMBLY METHOD

摘要

A balancer device for an internal combustion engine includes upper and lower housings made of aluminum alloy. The upper housing includes a leg part fixed to the engine. The lower housing is coupled to the upper housing by tightening bolts. A pair of balancer shafts are rotatably supported by the upper and lower housings. A positioning pin is disposed at a distal end portion of the leg part for positioning the upper housing with respect to the engine by positional correspondence to a positioning hole of the engine when the tightening bolts are tightened. The leg part is inclined outwardly with respect to a body of the upper housing such that a distal end of the positioning pin is located outside of a proximal end of the leg part with respect to the body of the upper housing when the tightening bolts are loosened.

主权项

1. A balancer device for an internal combustion engine, the balancer device comprising:
an upper housing including a plurality of leg parts configured to be fixed to the internal combustion engine, wherein the upper housing is made of aluminum alloy; a lower housing configured to be coupled to the upper housing by a plurality of tightening bolts, wherein the lower housing is made of aluminum alloy; a pair of balancer shafts disposed in an internal space formed between the upper housing and the lower housing, and rotatably supported through bearings with respect to the upper housing and the lower housing; and a positioning pin disposed at a distal end portion of a corresponding one of the leg parts, and configured to extend longitudinally of the corresponding leg part, and position the upper housing with respect to the internal combustion engine by positional correspondence to a positioning hole of the internal combustion engine under a first condition that the tightening bolts are tightened to couple the lower housing to the upper housing; wherein the corresponding leg part is inclined outwardly with respect to a body of the upper housing such that a distal end portion of the positioning pin is located outside of a proximal end portion of the corresponding leg part with respect to the body of the upper housing under a second condition that the tightening bolts are loosened.