Hilti Aktiengesellschaft

Hilti Akiengesellschaft

Jochen Erhardt

Helmut Burger

Uto Plank

Reinhard Riedl

Peter Gerold

Ernst-Rudolf Lübkert

Wolfgang Schreiber

Thomas Reichenberger

Michael Hinterstoisser

An electropneumatic impact mechanism for an electric hand-held power tool, in particular a hammer drill and/or chipping hammer, wherein the impact mechanism has a transmission housing, a guide tube arranged at least partially in the transmission housing, an exciter piston that is movable in the guide tube, a connecting rod coupled to the exciter piston, and an eccentric wheel which is designed as an externally toothed gearwheel and is coupled to the connecting rod on one side and is mounted so as to be rotatable with respect to the transmission housing about an axis of rotation on the other side, an axial gap, preferably for optionally receiving at least part of a lubrication space separating element, is provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel.

Electropneumatic impact mechanism

A portable power toolhas a tool holderfor retaining a tool, a handle, an electric motor, and a drive train. The drive train couples the electric motorto the tool holder. The drive traincontains a planetary transmissionwith a planet carrierand a plurality of planet gears. At least one of the planet gearshas a cylindrical cutoutand the planet carrierhas a collarin the form of a circular arc that protrudes into the cutout

Portable power tool

A drive shaft for a machine tool, for example a core drilling machine, able to be connected to a drilling tool, in particular a core bit, is disclosed. The drive shaft contains a cavity which substantially extends over the whole length of the drive shaft and along the rotational axis. The cavity contains at least one inflow opening where, through the at least one inflow opening, water can be fed along the drive shaft into the drilling tool. In the drive shaft, an insertion device is provided in the cavity, through which water is guided for cooling the drive shaft, firstly, in a first direction and then in a second direction, where the water comes into direct contact with the inner side of the cavity at least in the first direction.

Drive shaft with insertion device for guiding cooling water

A rotor () for an electric motor (). The rotor () has a rotor shaft () and a rotor core () attached onto the rotor shaft (). The rotor core has a plurality of core laminations () arranged along an axis (A) of the rotor core (), and has a plurality of poles of at least one pole pair, the core lamination () having: a central recess () through which the rotor shaft () passes and which has a contour () as well as adjacent areas (AF), and a plurality of receiving structures arranged at peripheral angular positions in order to each form a receiving element for a pole-forming element on the rotor core (). In this context, it is provided according to the invention that the rotor core has a surface (OF) facing the rotor shaft () that is formed together with the adjacent areas (AF) of the central recess () of the plurality of core laminations (), and that has uneven areas crosswise to the axis (A) of the rotor core () that are formed by the contours () of the central recesses () of the plurality of core laminations (). The contours () of the central recesses () of at least a first core lamination and a second core lamination of the plurality of core laminations () are arranged so as not to be congruent with each other.

Rotor for an electric motor, an electric motor and a production process for an electric motor

A hand-held electric power tool () includes a switching gear unit () which has at least two switching stages, including an impact mechanism () which can be switched on, and a mode switch () with which the switching gear unit () can be switched back and forth between the switching stages. The impact mechanism () can be switched on and off, and the mode switch () is movement-coupled with a gear unit switching mechanism () of the switching gear unit () and with an impact mechanism switching mechanism () of the impact mechanism (). The impact mechanism switching mechanism () has a swiveling mechanism which can be swiveled by the mode switch () between an active position, in which the impact mechanism () can be activated, and a passive position in which the impact mechanism () is deactivated.

Hand-held electric power tool

A combined electrical hand tool having an operating mode selection switch ( ) with additional special functions that can be switched using a displaceable linkage ( ) that can be displaced by the operating mode selection switch arranged between a lubricated assembly ( ) having a coupling ( ) and the external housing ( ), wherein in at least two separate lubricant-tight assemblies ( ) at least one switchable coupling ( ) is present, which can be moved over an outwardly extending actuator ( ) that is mounted lubricant-tight.

Growing community of inventors

Klosterlechfeld, Germany

Jochen Erhardt