Machine tool device

Patent metadata

Field	Value
Publication number	US-11607792-B2
Application number	US-201816649922-A
Country	US
Kind code	B2
Filing date	Sep 14, 2018
Priority date	Sep 21, 2017
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

A machine tool device for a portable machine tool in one embodiments includes at least one coupling unit which couples a machining tool and at least one drive unit configured to drive the coupling unit. The machine tool device includes a recuperation unit which provides, in at least one deactivated state of the drive unit, electrical energy which supplies at least one functional unit from a kinetic energy of at least the coupling unit.

First claim

The invention claimed is:

1. A power tool device for a portable power tool, comprising:
at least one coupling unit configured to couple a work tool;
at least one drive unit configured to drive the at least one coupling unit;
a recuperation unit that is configured, in at least one deactivated state of the drive unit, to provide electrical energy to supply at least one function unit using kinetic energy at least of the coupling unit;
a switching unit designed (i) for phase angle control, (ii) for switching over between alternating-current operation wherein mains electric power is supplied to the power tool device, and direct-current operation wherein mains electric power is not supplied to the power tool device, and (iii) as a main switch: and
a current sensor unit designed to measure a motor current in at least one activated state of the drive unit, to measure a braking current in the at least one deactivated state of the drive unit, and for diagnosis of the switching unit, wherein:
the switching unit includes a first triac positioned in electrical series between the current sensor unit and at least one field winding of the at least one drive unit;
the switching unit includes a second triac positioned in electrical series between the at least one field winding and a first mains power connection of the power tool device;
the power tool device comprises a third triac positioned in electrical series between an armature of the at least one drive unit and the at least one field winding; and
the power tool device comprises a fourth triac positioned in electrical series between the at least one field winding and the current sensor unit.

2. The power tool device as claimed in claim 1 , wherein the at least one function unit is configured to provide at least one function in the deactivated state of the at least one drive unit.

3. The power tool device as claimed in claim 2 , wherein the at least one function comprises at least one of a safeguard function and a convenience function.

4. The power tool device as claimed in claim 2 , wherein the at least one function unit comprises a braking unit configured to brake at least one of the coupling unit and the work tool.

5. The power tool device as claimed in claim 4 , wherein the function unit has a control unit configured for at least one of partial automatic open-loop and closed-loop control of an adaptable braking function of the braking unit.

6. The power tool device as claimed in claim 4 , wherein the drive unit and the braking unit are realized at least partially as one piece with each other.

7. The power tool device as claimed in claim 1 , wherein the drive unit and the recuperation unit are realized at least partially as one piece with each other.

8. The power tool device as claimed in claim 1 , wherein the recuperation unit is configured to provide the electrical energy independently of an external energy supply.

9. The power tool device as claimed in claim 8 , further comprising:
a monitoring unit configured to determine a loss of the external energy supply.

10. The power tool device as claimed in claim 1 , further comprising:
a voltage transformer unit, wherein the power tool device is configured, in at least one activated state of the drive unit, to supply electrical energy from an external alternating-current power supply system to the voltage transformer unit and configured, in the at least one deactivated state of the drive unit, to supply electrical energy to the voltage transformer unit using the recuperation unit.

11. A portable power tool, comprising:
at least one power tool device, the at least one power tool device including
at least one coupling unit configured to couple a work tool,
at least one drive unit configured to drive the at least one coupling unit,
a recuperation unit that, in at least one deactivated state of the drive unit, provides electrical energy to supply at least one function unit using kinetic energy at least of the coupling unit, and
a switching unit designed (i) for phase angle control, (ii) for switching over between alternating-current operation wherein mains electric power is supplied to the power tool device, and direct-current operation wherein mains electric power is not supplied to the power tool device, and (iii) as a main switch, wherein:

the switching unit includes a first triac positioned in electrical series between a current sensor unit and at least one field winding of the at least one drive unit;
the switching unit includes a second triac positioned in electrical series between the at least one field winding and a first mains power connection of the power tool device
the power tool device comprises a third triac positioned in electrical series between an armature of the at least one drive unit and the at least one field winding; and
the power tool device comprises a fourth triac positioned in electrical series between the at least one field winding and the current sensor unit.

12. A method for operating a power tool device, comprising at least one coupling unit configured to couple a work tool, and at least one drive unit configured to drive the at least one coupling unit the method comprising;
providing phase angle controlled electrical energy to the at least one drive unit using a switching unit as a main switch, the switching unit providing the phase angle control;
storing kinetic energy in at least one of the at least one coupling unit and the work tool; and
controlling switching over between alternating-current operation and direct-current operation using the switching unit, thereby
terminating the provision of mains electrical energy to the at least one drive unit after storing the kinetic energy, and
supplying at least one function unit with energy from a recuperation device using the stored kinetic energy after terminating the provision of electrical energy to the at least one drive unit, wherein:

providing phase angle controlled electrical energy to the at least one drive unit comprises providing phase angle controlled electrical energy to the at least one drive unit through (i) a first triac of the switching unit positioned in electrical series between a current sensor unit and at least one field winding of the at least one drive unit, and (ii) a second triac of the switching unit positioned in electrical series between the at least one field winding and a first mains power connection of the power tool device; and
supplying the at least one function unit with energy from the recuperation device using the stored kinetic energy comprises supplying the at least one function unit with energy from the recuperation device through (i) a third triac positioned in electrical series between an armature of the at least one drive unit and the at least one field winding, and (ii) a fourth triac positioned in electrical series between the at least one field winding and the current sensor unit.

Assignees

• Bosch Gmbh Robert

Inventors

• Wiker Juergen
• Dennis Daniel
• Schneider Matthias

Classifications

• B25F5/001 Primary

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• H02P3/06

  for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter · CPC title

• B25F5/02 Primary

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• H02P25/14

  Universal motors (H02P25/12 takes precedence) · CPC title

• H02P3/12

  by short-circuit or resistive braking · CPC title