| 摘要 |
<p>In an internal combustion engine (E) of a vehicle there is provided a balance shaft assembly (11) connected to the crankshaft support member (2). There are aligned fixing apertures in the crankshaft support member (2) and the cylinder block by which the member and block may be connected together. The balance shaft assembly (11) comprises a pair of rotary balance shafts (14) supported in a housing that has fixing apertures aligned with those in the crankshaft support member and the cylinder block. The longitudinal axis defined by certain aligned apertures (25, 26) intersects the swept volume of rotation described in rotational operation by at least one of the balance shafts (14) and so at least one balance shaft is provided with a recess so that in a predetermined orientation it allows access to the aligned apertures so as to permit insertion of a fixing member into the apertures with the balance shafts (14) in situ. The design allows a balance shaft assembly to be fitted with only minor modification to the engine block and without providing an increase in noise.</p> |
