Impact tool
AssigneeHitachi Koki Co., Ltd.
InventorsHironori MASHIKO, Tomomasa NISHIKAWA, Nobuhiro TAKANO
Life of this patent
Estimating the term…
Abstract
An impact tool including: a motor including, a rotor, a stator, and a detecting device that detects a rotation position of the rotor; a hammer driven by the motor so as to be rotated; an anvil configured to rotate relatively to the hammer and is struck by the hammer; and an output shaft connected to the anvil; wherein the anvil is struck by the hammer by rotating the hammer in a forward rotation direction by a second predetermined amount after rotating the hammer in a reverse rotation direction by a first predetermined amount, and wherein the first predetermined amount and the second predetermined amount are controlled based on a rotation angle that is obtained based on an output of the detecting device.
Claims18
An impact tool comprising:
- a motor including,
- a rotor,
- a stator, and
- a detecting device that detects a rotation position of the rotor;
- a hammer driven by the motor so as to be rotated;
- an anvil configured to rotate relatively to the hammer and is struck by the hammer;
- and
- an output shaft connected to the anvil;
- wherein the anvil is struck by the hammer by rotating the hammer in a forward rotation direction by a second predetermined amount after rotating the hammer in a reverse rotation direction by a first predetermined amount, and
- wherein the first predetermined amount and the second predetermined amount are controlled based on a rotation angle that is obtained based on an output of the detecting device.
An impact tool comprising:
- a motor;
- a hammer connected to the motor;
- an anvil rotated by the hammer;
- and
- a control section for controlling rotation of the motor,
- wherein the hammer strikes the anvil so as to rotate the anvil, and
- wherein the control section stops supply of a drive voltage to the motor near a timing when the hammer strikes the anvil.
An impact tool comprising:
- a motor;
- a hammer driven by the motor so as to be rotated;
- an anvil configured to rotate relatively to the hammer and is struck by the hammer;
- and
- an output shaft connected to the anvil,
- wherein the anvil is struck by the hammer by rotating the hammer in a forward rotation direction by a second predetermined amount after rotating the hammer in a reverse rotation direction by a first predetermined amount, and
- wherein a duty ratio of pulse-width modulation control is limited during a predetermined period immediately after a rotation direction of the motor is switched to rotate the hammer in the reverse rotation direction or in the forward rotation direction such that the duty ratio of the pulse-width modulation control gradually increases from 0%, and after the duty ratio has reached a limit value, the motor is driven during the predetermined period at a duty ratio of the limited value.
Dependencies are inferred from the claim text.