Power transmission system for working machine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYoshitaka Ohta, Tomoaki Ishikawa
Life of this patent
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Abstract
A power transmission system for a working machine, wherein drive power is transmitted from an engine to a work-tool holding drive shaft via a reduction mechanism is provided. The reduction mechanism includes an input shaft having a first gear, and an output shaft having a second gear. The second gear has a gear portion and a cylindrical boss segment press fitted thereto, forming a torque limiter. As a result, the reduction mechanism, which has the torque limiter, has a simplified structure, enabling easy assemblage.
Claims19
A power transmission system for a working machine wherein drive power is transmitted from a prime mover to a work-tool holding drive shaft via a reduction mechanism for driving a work tool mounted on the work-tool holding drive shaft in a working condition thereof, the reduction mechanism comprising:
- an input shaft;
- a first gear mounted on the input shaft;
- an output shaft;
- a second gear mounted on the output shaft and meshing with the first gear;
- and
- a gear case for accommodating the first and second gears;
- wherein the second gear has a torque limiter comprising a gear portion and a cylindrical boss press fitted to the gear portion, the boss having at one end an annular flange and the gear portion having an annular recess to accommodate the annular flange.
A transmission mechanism for an internal combustion engine for transmitting rotation of an output shaft of the engine to rotation of a driven mechanism, comprising:
- an input shaft having a worm gear provided thereon for undergoing rotation with the output shaft of the engine;
- a gear wheel in meshing engagement with the worm gear and comprised of a gear portion having a central opening therethrough and a boss press fitted to a peripheral mating surface of the central opening;
- and an output shaft extending through an opening formed in the boss to undergo rotation therewith to drive the driven mechanism;
- wherein the boss undergoes rotation independent of the gear portion in response to an excessive torque caused by a reversed input from the driven mechanism, at least one of a press-fit surface of the gear portion and a press-fit surface of the boss portion is subjected to a sulphurizing process, and a boss has an annular flange at one end and the gear portion has an annular recess to accommodate the annular flange.
Dependencies are inferred from the claim text.