Screw-in Device Rolling Element Torque Transmission
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Solution Overview
Problem
Existing screwing devices experience wear and friction issues due to torque transmission between contact surfaces, particularly when impact is applied in the longitudinal direction, leading to surface destruction over time.
Innovation Solution
A screwing device with an outer rotor and armature connected by rolling elements in grooves, allowing for relative movement and torque transmission, featuring a design that minimizes friction through the use of spherical or cylindrical rolling elements and a damping element to absorb recoil, and a seal to prevent dust ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If contact surface pairs are arranged on a large diameter to reduce mechanical load, then torque transmission is improved, but friction between contact surfaces increases leading to surface destruction
Solution Approach 1:
The patent replaces flat contact surfaces with spherical rolling elements (balls) that roll between the drive shaft and motor shaft. This curvature transformation converts sliding friction into rolling friction, dramatically reducing wear while maintaining torque transmission capability at large diameters
Solution Approach 2:
The patent substitutes a direct friction-based contact surface torque transmission system with a rolling element bearing system. The rolling elements mediate the torque transfer, replacing the harmful sliding contact mechanism with a rolling contact mechanism that generates minimal friction and wear
2Productivity
If impact force is applied in the longitudinal direction simultaneously with torque in the circumferential direction, then screwing efficiency is improved, but friction between contact surfaces increases destroying the surface
Solution Approach 1:
The spherical rolling elements accommodate both axial impact loads and circumferential torque loads simultaneously. The ball geometry allows free rolling motion that handles multi-directional forces without generating sliding friction, enabling simultaneous impact and torque application without surface destruction
Solution Approach 2:
The patent changes the fundamental parameter of contact interaction from sliding friction to rolling friction by introducing spherical elements. This parameter change enables the system to handle combined axial and circumferential loads without the surface destruction that would occur with traditional flat contact surfaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device reduces wear and enhances torque transmission efficiency while protecting components from damage, resulting in a more durable and effective screwing mechanism.
Implementation Method 1
The armature is mounted in the outer rotor by means of rolling elements arranged circumferentially on the armature in such a way that a relative movement between the armature and the outer rotor can be carried out in the direction of the axis of rotation and a torque about the axis of rotation can be applied to the armature by the outer rotor. The torque can be transmitted via the rolling elements.
Implementation Method 2
a device for installing screw foundations in the ground. The device comprises a rotary device for screwing in the screw foundation and an impact device for generating an impact force in the direction of insertion of the screw foundation.
Data Source
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AI summary
The invention relates to a screw-in device, in particular a screw foundation screw-in device, comprising an armature with a rotational axis for receiving a screw-in tool, an outer rotor which is arranged concentrically to the rotational axis of the armature and can be driven rotaryally by a motor, and a striking device from which impact energy can be introduced into the armature. The armature is mounted in the outer rotor by means of rolling elements arranged circumferentially on the armature in such a way that a relative movement between the armature and the outer rotor is possible in the direction of the rotational axis and a torque about the rotational axis can be introduced onto the armature from the outer rotor via the rolling bearings.