Balancer device for internal combustion engines
AssigneeHitachi Astemo, Ltd.
InventorMasashi Sawada
Life of this patent
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Abstract
Disclosed is a balancer device for an internal combustion engine, wherein: a pump mounting fixing part to which an oil pump is fixed is formed on an end surface of a lower housing member; a gear accommodation part in which a pump driving gear and a reduction gear are accommodated is provided between the oil pump and the pump mounting fixing part; a rigidity-reinforcing part in which an oil discharge passage is defined in communication with a discharge port of the oil pump is formed on the lower housing member so as to extend in a direction of extension of first and second balancer shafts on an outer side of the lower housing member; and a portion of the pump mounting fixing part formed on the end surface of the lower housing member and the rigidity-reinforcing part are made integral with each other.
Claims12
A balancer device for an internal combustion engine, comprising:
- a first balancer shaft having mounting thereon a first transmission gear and a first balancer weight and to which a rotational force is transmitted from the internal combustion engine;
- a second balancer shaft having mounting thereon a second transmission gear in mesh with the first transmission gear, a reduction gear and a second balancer weight;
- a housing accommodating therein at least portions of the first and second balancer shafts;
- an oil pump having a pump driving gear in mesh with the reduction gear and a pump body configured to discharge oil upon transmission of a rotational force from the pump driving gear;
- a pump mounting fixing part formed on the housing and having a surface to which the oil pump is fixed;
- a gear accommodation part accommodating therein the pump driving gear, the pump mounting fixing part being formed so as to include a portion of the gear accommodation part;
- and
- a first rigidity-reinforcing part extending on an outer side of the housing in a direction of extension of the first and second balancer shafts and having defined therein a discharge passage connected to and opened to a discharge port of the oil pump,
- the first rigidity-reinforcing part being formed integrally with the housing including a portion of the pump mounting fixing part opposite from the surface to which the oil pump is fixed in the direction of extension of the first and second balancer shafts.
A balancer device for an internal combustion engine, comprising:
- a balancer shaft having mounted thereon a reduction gear and a balancer weight, the reduction gear being configured to rotationally drive a pump driving gear of an oil pump;
- a lower housing member accommodating therein at least a portion of the balancer shaft including the balancer weight;
- a pump mounting fixing part formed on an end surface of the lower housing member and having a surface to which the oil pump is fixed;
- a gear accommodation part provided between the oil pump and the pump mounting fixing part and accommodating therein the pump driving gear of the oil pump and the reduction gear, the pump mounting fixing part being formed so as to include a portion of the gear accommodation part;
- and
- a rigidity-reinforcing part extending on an outer side of the lower housing member in a direction of extension of the balancer shaft and having a discharge passage defined therein in communication with a discharge port of the oil pump,
- the rigidity-reinforcing part being formed integrally with the lower housing member including a portion of the pump mounting fixing part opposite from the surface to which the oil pump is fixed.
Dependencies are inferred from the claim text.