A cooling fan includes: a hub; a plurality of cooling vanes provided along an outer circumference of the hub; and an annular connector for connecting the cooling vanes. The hub is provided with a through hole that axially penetrates the hub. A first cover on a case for covering an outward side of th
A cooling fan includes: a hub; a plurality of cooling vanes provided along an outer circumference of the hub; and an annular connector for connecting the cooling vanes. The hub is provided with a through hole that axially penetrates the hub. A first cover on a case for covering an outward side of the cooling fan is provided with a first outer-air intake. A second cover for partitioning between the cooling fan and a crankcase and for covering an inward side of the cooling fan is provided with a second outer-air intake. With this arrangement, even when one outer-air intake (for instance, the first outer-air intake) adjacent to where the cooling vanes are provided is clogged by a large amount of dust generated during operations, the cooling vanes can breathe from the non-clogged other outer-air intake (for instance, the second outer-air intake) through the through hole, thereby restraining reduction in air flow.
대표청구항▼
1. A chain saw, comprising: an engine;a cooling fan which is disposed on a lateral side of a crankcase of the engine, and which is rotationally driven by the engine; anda case that accommodates the engine and the cooling fan,wherein the cooling fan includes: a hub fixed on a crankshaft of the engine
1. A chain saw, comprising: an engine;a cooling fan which is disposed on a lateral side of a crankcase of the engine, and which is rotationally driven by the engine; anda case that accommodates the engine and the cooling fan,wherein the cooling fan includes: a hub fixed on a crankshaft of the engine;a plurality of cooling vanes provided along an outer circumference of the hub; andan annular connector that connects the cooling vanes,wherein the case includes: a first cover that covers an outer side of the cooling fan; anda second cover that covers an inner side of the cooling fan,wherein the first cover is provided with a first outer-air intake that feeds outer air to the outer side of the cooling fan, and the second cover is provided with a second outer-air intake that feeds outer air to the inner side of the cooling fan,wherein the hub is provided with a through hole that axially penetrates the hub and intercommunicates the outer side and the inner side of the cooling fan,wherein the hub comprises spoke portions which extend radially outward from a center of the hub, the spoke portions being provided as structures different from the annular connector and the cooling vanes, the through hole being provided between two adjacent spoke portions,wherein the connector includes: an annular first connector that connects substantially central portions of the cooling vanes; andan annular second connector which is located axially closer to the inner side of the cooling fan than the first connector,wherein the first connector and the second connector are both ring-shaped,wherein the first connector and the second connector are connected to radially distal ends of the spoke portions of the hub, andwherein the cooling vanes are connected to the second connector such that radially proximal ends of the cooling vanes closest to the center of the hub extend toward the center of the hub not farther than a radially proximal end of the second connector which is closest to the center of the hub. 2. The chain saw according to claim 1, wherein the inner side of the first connector is provided with a pair of thick portions formed to be thick, an ignition magnet is accommodated in a first one of the pair of thick portions, and the first connector extends between the pair of thick portions while being flexed to outwardly bulge. 3. The chain saw according to claim 1, wherein the hub is provided with a plurality of the through holes that axially penetrate the hub and intercommunicate the outer side and the inner side of the cooling fan. 4. The chain saw according to claim 1, wherein the first connector is located substantially at an axial center of the cooling fan,wherein the first and second connectors have different diameters, andwherein a plurality of radial circumferential holes for radially ejecting cooling air therethrough are defined by the cooling vanes and the first and second connectors. 5. The chain saw according to claim 1, wherein the first connector connects the cooling vanes at a position which is radially different from a position at which the second connector connects the cooling vanes. 6. The chain saw according to claim 2, wherein the first connector is flexed to outwardly bulge such that at a portion thereof furthest from a radial center of the cooling fan, an axial position of the first connector is closest to the inner side of the fan at a circumferential position of either of the pair of thick portions, and is closest to the outer side of the fan at a circumferential position corresponding to a midpoint between the pair of thick portions in a circumferential direction. 7. The chain saw according to claim 5, wherein the first connector connects the cooling vanes at a position farther from a radial center of the cooling fan than a position at which the second connector connects the cooling vanes. 8. The chain saw according to claim 1, wherein the cooling vanes each include: a first cooling vane provided on an outer side of the first connector; anda second cooling vane provided on an inner side of the first connector. 9. The chain saw according to claim 8, wherein the second cooling vanes are connected to the second connector at radially proximal ends thereof, and the second cooling vanes are not in contact with the second connector at radial distal ends thereof. 10. The chain saw according to claim 9, wherein all of a portion of the second cooling vanes in a radial direction thereof at an axial position of the first connector are in contact with the first connector. 11. The chain saw according to claim 4, wherein the spoke portions include axially extending portions which extend between radially distal end portions of the second connector and radially proximal portions of the first connector.
Hazzard Harry Irvin (Culver City CA) Moore Harold Edward (Torrance CA), Apparatus for removing entrained matter from the inlet air of a chain saw internal combustion engine.
Hoppner Klaus (Marbach DEX) Forderer Karl (Schwaikheim DEX) Lohse Georg (Waiblingen DEX) Uhl Klaus-Martin (Baltmannsweiler DEX), Portable handheld work apparatus having a filter case.
Landwehr Goetz (Berglen-Rettersburg DEX) Lux Helmut (Waiblingen DEX) Duemmel Karl-Heinz (Lossburg DEX), Silencer, especially for portable motor chain saws.
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