JPWO2020099178A5

JPWO2020099178A5 -

Info

Publication number: JPWO2020099178A5
Application number: JP2021524412A
Authority: JP
Publication date: 2022-11-04

Claims

A handheld power tool (10) comprising a motor, an output shaft (20), and a gearing (30) disposed between the output shaft and a drive shaft coupled to the motor, the gearing comprising ,
a gear input shaft (4) configured to be driven by said motor;
a gear output shaft (1) configured to engage said output shaft;
a gearing subassembly;
wherein the gearing subassembly comprises:
a sun gear (4a) disposed on and cooperating with said input shaft (4);
an outer element (2) comprising an internal gear (2a);
at least one planetary gear (3) arranged between said sun gear and said internal gear and configured to transmit rotary motion therebetween;
a planet carrier (7);
with
The gear train further comprises a first freewheel clutch mechanism (5) and a second freewheel clutch mechanism (6) each configured to selectively transmit torque to the gear output shaft. ,
The first freewheel clutch mechanism (5) is arranged to selectively provide a first torque transmission coupling between the gear input shaft and the gear output shaft bypassing the gearing subassembly. ,
said second freewheel clutch mechanism (6) is arranged to selectively provide a second torque transmission coupling between said drive shaft and said gear output shaft through said gearing subassembly;
The first freewheel clutch mechanism provides the torque transfer coupling when the driveshaft rotates in a first direction and the second freewheel clutch mechanism provides the driveshaft rotation in a second opposite direction. providing said second torque transfer coupling when rotating;
A power tool characterized by:

said first freewheel mechanism (5) is arranged to engage said input shaft (4) and said gear output shaft (1);
The power tool according to claim 1.

Said first freewheel mechanism (5) comprises a cylindrical element (5) having a cylindrical outer surface (5a) and at least one motion transmission element (5b) arranged to engage the cylindrical element (5). ), wherein said cylindrical outer surface fits onto an output shaft (1) and said at least one motion transmission element is further configured to engage an outer surface of an input shaft (4);
The power tool according to claim 1 or 2.

said second freewheel mechanism (6) is arranged to engage said outer element (2) and said output shaft (1);
The power tool according to any one of claims 1 to 3.

Said second freewheel mechanism (6) comprises a cylindrical element (6) having a cylindrical outer surface (6a) and at least one motion transmission element (6) arranged to engage said cylindrical element (6). 6b), wherein said cylindrical outer surface (6a) is fitted to said outer element (2) and said at least one motion transmission element is further adapted to engage the outer surface of said output shaft (1). has been
The power tool according to claim 4.

at least one of the first and second freewheel mechanisms is a roller clutch;
The power tool according to any one of claims 1 to 5.

further comprising a housing enclosing at least said motor and said gearing, the rotational movement of said planet carrier (7) being fixed with respect to said housing;
The power tool according to any one of claims 1 to 6.

Said gearing further comprises an outer sleeve, said outer sleeve being fixedly arranged in said housing, the rotational movement of said planet carrier (7) being fixed with respect to said outer sleeve,
The power tool according to claim 7.

the first and second freewheel mechanisms are coaxially arranged;
The power tool according to any one of claims 1 to 8.

the first and second freewheel mechanisms are arranged such that there is at least partial axial overlap between the first and second freewheel mechanisms;
The power tool according to claim 7.

when the drive shaft rotates in the first direction, the gearing has a gear ratio of 1:1;
A power tool according to any one of claims 1 to 10.

when the drive shaft rotates in the second opposite direction, the gear ratio is different from 1:1;
The power tool according to claim 11.

wherein the power tool is a power tool selected from the group consisting of screwdrivers, nutrunners, drills, and grinders;
A power tool according to any one of claims 1 to 12.

A gearing for use in a hand-held power tool comprising a motor, an output shaft (20), and a gearing (30) disposed between the output shaft and a drive shaft coupled to the motor, comprising:
a gear input shaft (4) configured to be driven by said motor;
a gear output shaft (1) configured to engage said output shaft;
a gearing subassembly;
wherein the gearing subassembly comprises:
a sun gear (4a) disposed on and cooperating with said input shaft (4);
an outer element (2) comprising an internal gear (2a);
at least one planetary gear (3) arranged between said sun gear and said internal gear and configured to transmit rotary motion therebetween;
a planet carrier (7),
The gear train further comprises a first freewheel clutch mechanism (5) and a second freewheel clutch mechanism (6) each configured to selectively transmit torque to the gear output shaft. ,
The first freewheel clutch mechanism (5) is arranged to selectively provide a first torque transmission coupling between the gear input shaft and the gear output shaft bypassing the gearing subassembly. ,
said second freewheel clutch mechanism (6) is arranged to selectively provide a second torque transmission coupling between said drive shaft and said gear output shaft through said gearing subassembly;
The first freewheel clutch mechanism provides the torque transfer coupling when the driveshaft rotates in a first direction and the second freewheel clutch mechanism provides the driveshaft rotation in a second opposite direction. A gearing that provides said second torque transmission coupling when rotating.