Electromechanical gear selection device comprising an actuator

Patent metadata

Field	Value
Publication number	US-11598413-B2
Application number	US-201816624646-A
Country	US
Kind code	B2
Filing date	Jun 20, 2018
Priority date	Jun 29, 2017
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A method for setting a gear in a transmission of a power tool, the power tool including an electric motor as well as a controller for setting the rotational speed of the electric motor. A transmission includes an operating device for selecting a gear in the transmission, a shift fork as well as an actuator, the operating device including a signal transmitter as well as a sensor for receiving a signal of the signal transmitter. The method includes: setting the operating device from a first position to a second position for selecting a gear in the transmission; detecting a signal by the at least one sensor according to the second position of the operating device; transmitting a signal to the controller; setting the rotational speed of the electric motor from a first value to a second value by the controller; positioning the operating device from the second position into a third position; detecting a signal by the sensor according to the third position of the operating device; transmitting a signal to the actuator; and setting the shift fork from a first position to a second position with the aid of the actuator for the purpose of changing from a first gear into a second gear.

First claim

What is claimed is:

1. A method for setting a gear in a transmission of a power tool, the power tool including an electric motor for generating and transmitting a torque to the transmission as well as a controller for setting a rotational speed of the electric motor, and the transmission including an operating device for selecting the gear in the transmission, a shift fork as well as an actuator for converting a first signal into a mechanical movement of the shift fork, the operating device including at least one signal transmitter as well as at least one sensor for receiving at least one signal of the at least one signal transmitter, the method comprising the steps of:
setting the operating device from a first operating device position to a second operating device position for selecting the gear;
detecting the at least one signal by the at least one sensor according to the second position of the operating device;
transmitting at least one sensor signal to the controller;
setting the rotational speed of the electric motor from a first value to a second value with the aid of the controller;
positioning the operating device from the second operating device position to a third operating device position;
detecting the at least one signal via the at least one sensor according to the third operating device position;
transmitting a first signal corresponding to the at least one sensor signal to the actuator; and
setting the shift fork with the aid of the actuator from a first shift fork position to a second shift fork position for changing from a first gear to a second gear.

2. A power tool for carrying out the method as recited in claim 1 , the power tool comprising the transmission, the electric motor for generating and transmitting the torque to the transmission, the controller for setting the rotational speed of the electric motor, the operating device for selecting the gear in the transmission, the shift fork for engaging the gear in the transmission and the actuator for converting the first signal into a mechanical movement of the shift fork, the operating device including the at least one signal transmitter and the at least one sensor for receiving the at least one signal of the at least one signal transmitter.

3. The power tool as recited in claim 2 wherein the signal transmitter is designed in the form of a magnet, and the sensor is designed in the form of a Hall sensor.

4. The power tool as recited in claim 2 wherein a shifting energy store is contained in the transmission, a force appliable to a shift fork of the transmission to pretension the shift fork for a transition from a first position into a second position.

5. A transmission for a power tool having an electric motor for generating and transmitting a torque to the transmission as well as a controller for setting a rotational speed of the electric motor, the transmission comprising:
an operating device for selecting a gear in the transmission, a shift fork as well as an actuator for converting a first signal into a mechanical movement of the shift fork, the operating device including at least one signal transmitter as well as at least one sensor for receiving at least one signal of the at least one signal transmitter, the transmission for the power tool being capable of carrying out the steps of:
setting the operating device from a first operating device position to a second operating device position for selecting the gear;
detecting the at least one signal by the at least one sensor according to the second position of the operating device;
transmitting at least one sensor signal to the controller;
setting the rotational speed of the electric motor from a first value to a second value with the aid of a controller;
positioning the operating device from the second operating device position to a third operating device position;
detecting the at least one signal via the at least one sensor according to the third operating device position;
transmitting a first signal corresponding to the at least one sensor signal to the actuator; and
setting the shift fork with the aid of the actuator from a first shift fork position to a second shift fork position for changing from a first gear to a second gear.

6. A core drill comprising the transmission as recited in claim 5 .

7. A core drill comprising the power tool as recited in claim 2 .

8. The method as recited in claim 1 wherein the power tool is a core drill.

Assignees

• Hilti Ag

Inventors

• Hanslmeier Xaver
• Van Taack-Trakranen John

Classifications

• B25F5/001 Primary

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

• F16H61/2807

  using electric control signals for shift actuators, e.g. electro-hydraulic control therefor  (F16H61/30, F16H61/32 take precedence) · CPC title

• F16H63/32

  Gear shift yokes, {e.g. shift forks} · CPC title

• F16H59/041 Primary

  consisting of a final output mechanism, e.g. ratio selector being directly linked to a shift fork · CPC title

• F16H61/0006

  Electronic control units for transmission control, e.g. connectors, casings or circuit boards · CPC title