Accessory mounting structure for internal combustion engine

摘要

In an accessory mounting structure for an internal combustion engine, an accessory unit block detachably supporting an engine accessory is attached to the side of the body of the engine. The accessory unit block has an upper portion of a flat shape, and a lower portion extending away from the engine body to terminate in a water pump housing. An upper fixing boss is formed on an upper part of the upper portion, while a lower fixing boss is formed on an end, remote from the engine body, of an upper-side edge of the water pump housing. The engine accessory is fixedly mounted on the unit block by attaching fixing brackets to the upper and lower fixing bosses. The engine accessory is thus compactly accommodated.

主权项

1. An accessory mounting structure for an internal combustion engine comprising a body having two ends and a side, and an accessory unit block supporting an engine accessory, the accessory unit block being detachably attached to the planar side surface of the body of the internal combustion engine, the side surface extending along a crankshaft of the engine:
wherein the accessory unit block comprises: an upper portion having a flat shape extending along the side surface of the engine body and including a cooling water supply part communicating with a cooling water inlet in the engine body; a middle portion extending in a curved shape from a lower part of the upper portion to protrude in a direction away from and perpendicular to the side surface of the engine body, and a lower portion extending downward from the middle portion and further away from the engine body and disposed more remote from the side surface of the engine body than the middle portion, in such a manner that the lower portion is offset relative to the upper portion to protrude in a direction further away from and perpendicular to the side surface of the engine body, the lower portion integrally having a water pump housing defining a pump chamber and a thermostat housing enclosing a thermostat; wherein the upper portion, the middle portion and the lower portion are shaped to form an L-shaped recessed space in which the engine accessory is accommodated, said L-shaped recessed space having opposite arms, one of the arms extending out of the planar side surface of the body of the engine; wherein the accessory unit block is formed therein with a cooling water discharge passage extending from the pump chamber in the water pump housing through the curved middle portion and the upper portion into the cooling water supply part of the accessory unit block, and the accessory unit block includes an upper fixing boss formed on an upper end part of the upper portion of the unit block, an upper-side edge extending in a direction away from and perpendicular to the planar side surface of the engine body on an upper side of the water pump housing of the lower portion, and a lower fixing boss formed on a remote end of the upper-side edge of the water pump housing; and wherein the engine accessory is formed with fixing brackets attached and fixed to the upper and lower fixing bosses of the unit block, respectively, and the engine accessory is fixedly mounted on the unit block by means of the fixing brackets.