1. An engine assembly comprising:
an air generating component that includes a radiator fan;
an air cleaner positioned to filter out debris carried by ambient incoming air prior to entry into an engine;
a scavenging conduit attached to the air cleaner and including a first end positioned to receive the debris from the air cleaner, and an exhaust end opening to an environment outside the engine for discharging the debris to the environment;
a duct extending between the air generating component and the scavenging conduit, and a second end of the duct opening into the scavenging conduit in a direction and at a location between the first end and the exhaust end to blow air from the air generating component toward the exhaust end of the scavenging conduit; and
wherein the blow air generates suction pressure at the first end of the scavenging conduit to pull the debris out of the air cleaner and push the debris out of the exhaust end into the environment.
2. The engine assembly of claim 1 wherein the second end of the duct is nearer the first end of the scavenging conduit than the exhaust end of the scavenging conduit.
3. The engine assembly of claim 2 wherein the duct is oriented at an acute angle with respect to the scavenging conduit such that the duct is tilted toward the exhaust end.
4. The engine assembly of claim 3 wherein the acute angle is between 30 and 80 degrees.
5. The engine assembly of claim 4 wherein the second end of the duct is configured as a nozzle so that the blow air enters the scavenging conduit at high velocity.
6. The engine assembly of claim 1 wherein the duct is oriented at an acute angle with respect to the scavenging conduit such that the duct is tilted toward the exhaust end.
7. The engine assembly of claim 6 wherein the acute angle is between 30 and 80 degrees.
8. The engine assembly of claim 7 wherein the second end of the duct is configured as a nozzle so that the blow air enters the scavenging conduit at high velocity.
9. The engine assembly of claim 1 wherein the second end of the duct is configured as a nozzle so that the blow air enters the scavenging conduit at high velocity.
10. The engine assembly of claim 9 wherein the second end of the duct is nearer the first end of the scavenging conduit than the exhaust end of the scavenging conduit.
11. A method of operating an engine assembly, comprising the steps of:
filtering out debris from ambient air with an air cleaner prior to entry into an engine;
positioning a first end of a scavenging conduit to receive the debris from the air cleaner;
discharging the debris through an exhaust end of the scavenging conduit into an environment outside the engine;
generating suction pressure at the first end of the scavenging conduit to pull the debris out of the air cleaner and into the scavenging conduit;
pushing the debris toward the exhaust end of the scavenging conduit with blow air supplied through a duct that opens into the scavenging conduit; and
generating the blow air with an air generating component that includes a radiator fan.
12. The method of claim 11 wherein the generating and pushing steps include orienting a second end of the duct at an acute angle tilted toward the exhaust end of the scavenging conduit.
13. The method of claim 12 wherein the generating and pushing steps further includes configuring the second end of the duct as a nozzle to deliver the blow air to the scavenging conduit at a high velocity.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electrical junction box comprising:
a casing made of a synthetic resin material;
a circuit board contained in said casing;
a heat generation part mounted on said circuit board; and
a heat radiation plate insert-molded in said casing, the heat radiation plate including:
an embedment section embedded in said casing by insert-molding; and
a connecting section exposed from said casing, wherein the connecting section is thermally connected to said heat generation part.
2. An electrical junction box according to claim 1, wherein an electrical conductive path is formed on said circuit board by means of a printed wiring process, a lead of said heat generation part is connected to said electrical conductive path, and said connecting section of said heat radiation plate is connected to said electrical conductive path near a position where said lead is connected to said electrical conductive path.
3. An electrical junction box according to claim 2, wherein a plurality of heat radiation plates are insert-molded in said casing, and said heat radiation plates are connected to said electrical conductive path connected to said lead of said heat generation part.
4. An electrical junction box according to claim 1, wherein said embedment section of said heat radiation plate is disposed in said casing at a position opposed to said heat generation part.
5. An electrical junction box according to claim 1, wherein a bus bar that is electrically connected to said circuit board is contained in said casing, and said bus bar is formed integrally to said heat radiation plate.
6. An electrical junction box according to claim 5, wherein said bus bar is disposed on said circuit board in a substantially vertical direction.
7. An electrical junction box according to claim 6, wherein a plurality of terminal metals are juxtaposed on said circuit board, and said bus bar is disposed in a clearance between said terminal metals.
8. An electrical junction box according to claim 4, wherein a plurality of connector housings are partitioned by bulkheads to be juxtaposed in said casing, each connector housing is adapted to be coupled to a mating connector, and said bus bar is insert-molded in said bulkhead.
9. An electrical junction box according to claim 4, wherein said bus bar and said heat radiation plate are thermally connected to said heat generation part.
10. An electrical junction box according to claim 4, wherein said bus bar constitutes an electrical power line for supplying an electrical power from an electrical power source to said circuit board.
11. An electrical junction box according to claim 1, wherein said casing is provided on an inner surface of a bottom wall with a slope, said slope is provided in the lowest part with a drainage port so that water in said casing is drained outside, and said casing is formed in a liquid-tight manner at an area different from said drainage port.
12. An electrical junction box according to claim 1, wherein said heat generation part is a semiconductor relay.