Reciprocating Mower Unit, System and Methods
AssigneeHusqvarna AB
InventorsNaoki Souri, Hiroyuki Miyazawa
Life of this patent
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Abstract
A reciprocating mower unit (14) comprises a reduction gear (54) and a crank mechanism (56) arranged within a housing (24). The reduction gear (54) receives input rotary motion from a transmission shaft at a first, relatively higher, rotation speed, and deliver an output rotary motion to a gear output shaft (58) at a second, relatively lower, rotation speed, whereas the crank mechanism (56) converts the output rotary motion of the gear output shaft (58) to an oscillating, anti-phase motion of a pair of mowing blades (32a, 32b) about a common oscillation axis (A1). The reciprocating mower unit (14) comprises an input shaft (48) provided with a coupling interface (49) for releasably coupling the input shaft (48) to the transmission shaft.
Claims18
A reciprocating mower unit configured to be driven by a drive unit via a transmission shaft arranged within a transmission tube, the reciprocating mower unit comprising:
- a housing;
- a reduction gear arranged within the housing, the reduction gear being configured to receive an input rotary motion from the transmission shaft at a first, relatively higher, rotation speed, and deliver an output rotary motion to a gear output shaft at a second, relatively lower, rotation speed;
- and
- a crank mechanism arranged within the housing, the crank mechanism being configured to convert the output rotary motion of the gear output shaft to an oscillating motion of a pair of mowing blades oscillating in mutual anti-phase about a common oscillation axis, wherein the reciprocating mower unit comprises an input shaft for receiving said input rotary motion from the transmission shaft, wherein the input shaft is provided with a coupling interface for releasably coupling the input shaft to the transmission shaft.
The reciprocating mower unit according to claim 18, wherein the coupling interface comprises splines for axially sliding into rotational engagement with mating splines of the transmission shaft.
The reciprocating mower unit according to claim 18, wherein the housing comprises a clamping arrangement for clamping the housing to the transmission tube.
A vegetation cutter system comprising:
- the drive unit comprising a motor and the transmission shaft of claim 18 arranged within the transmission tube;
- the reciprocating mower unit of claim 18;
- and
- a clearing saw unit configured to rotate a clearing saw blade, wherein the reciprocating mower unit and the clearing saw unit are configured to be alternatingly connected to the transmission shaft.
A method of operating a reciprocating mower unit comprising:
- driving a pair of mowing blades to oscillate in a guided mutual anti-phase motion about a common oscillation axis;
- and
- allowing a grounding body, axially held by the reciprocating mower unit at a bottom face thereof, to remain stationary.
A method of operating a reciprocating mower, comprising:
- operating a motor of a drive unit at a rotation speed of more than 8000 revolutions per minute;
- operating a transmission shaft having a length of at least 1 meter at the rotation speed of the motor;
- driving a first reduction gear step with an output rotary motion of the transmission shaft;
- driving a second reduction gear step with an output rotary motion of the first reduction gear step;
- and
- converting output rotary motion of the second reduction gear step to an oscillating motion of a pair of mowing blades.
Dependencies are inferred from the claim text.