Engine balancer apparatus

An engine balancer installed under a cylinder block, comprising:

• a crankshaft, the crankshaft being made of a material different from a material of the cylinder block;
• a balancer shaft, the balancer shaft being made of a material different from the material of the cylinder block;
• and
• a support portion extending from the cylinder block to support the balancer shaft, the support portion being made of a material having a substantially same coefficient of linear expansion as that of the material of the balancer shaft and the material of the crankshaft, the support portion comprising an upper end face coinciding with a horizontal line extending through an axis of the crankshaft, wherein
• said crankshaft further comprises a driving gear meshing with a driven gear of said balancer shaft, and
• said balancer apparatus comprising
• a first portion surrounding the balancer shaft,
• a second portion comprising an arm extending from the first portion in a first direction, and
• a third portion comprising an arm extending from the second portion in a second direction, the second and third portions being substantially perpendicular to the axis of the crankshaft.

An engine balancer apparatus installed under a cylinder block and having a crankshaft and balancer shaft that are made of material different from that of said cylinder block, wherein

• said crankshaft has a driving gear meshing with a driven gear of said balancer shaft,
• said balancer shaft has a support portion made of a material having substantially the same coefficient of linear expansion as that of said balancer shaft and said crankshaft, said support portion extending from said cylinder block corresponding to an axis of said crankshaft,
• an upper end face of said support portion being set to coincide with a horizontal straight line extending through the axis of said crankshaft,
• power transmitting means for transmitting power from said crankshaft to said balancer shaft is arranged on a flywheel side of an engine, and
• said balancer apparatus further comprises
• a first portion surrounding the balancer shaft,
• a second portion comprising an arm extending from the first portion in a first direction, and
• a third portion comprising an arm extending from the second portion in a second direction the second portion is substantially perpendicular to the third portion, the second and third portions being substantially perpendicular to the axis of the crankshaft.

An engine balancer apparatus installed under a cylinder block and having a crankshaft and balancer shaft that are made of materials different from that of said cylinder block, wherein

• said balancer shaft has a support portion made of a material having substantially the same coefficient of linear expansion as that of said balancer shaft and said crankshaft, said support portion extending from said cylinder block corresponding to an axis of said crankshaft,
• an upper end face of said support portion being set to coincide with a horizontal straight line extending through the axis of said crankshaft,
• said crankshaft has a driving gear meshing with a driven gear of said balancer shaft,
• said support portion of said balancer shaft forms a lubricant supply path to said balancer shaft, and
• said balancer apparatus comprising
• a first portion surrounding the balancer shaft,
• a second portion comprising an arm extending from the first portion in a first direction, and
• a third portion comprising an arm extending from the second portion in a second direction, the second and third portions being substantially perpendicular to the axis of the crankshaft.