Telescopic Screwdriving Transmission With Oblique Profile Toothing
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Solution Overview
Problem
Conventional screwdriving devices experience increased frictional forces between the hub and shaft, leading to feed motion inhibition and requiring larger, more costly feed drives due to high torque loads.
Innovation Solution
A screw device with an axially fixed rotary drive and a telescopic transmission unit featuring obliquely oriented profile toothing between the profile shaft and hub, which generates an axial feed force that counteracts frictional forces, allowing for a more compact and cost-effective feed drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional profile shaft and hub connection is used to transmit torque, then torque transmission is achieved, but frictional forces increase and inhibit feed motion
Solution Approach 1:
The patent changes the geometric parameters of the profile shaft and hub connection by introducing an oblique profile toothing with a specific inclination angle (beta). This parameter change transforms the force transmission characteristics, generating an axial feed force component that counteracts frictional forces during feed motion, thereby resolving the contradiction between torque transmission and feed motion ease.
Solution Approach 2:
The patent employs asymmetric profile toothing where the profile flanks are inclined at a specific angle relative to the axial direction. This asymmetric geometry creates different force components during rotation versus axial movement, enabling the system to transmit torque effectively while simultaneously generating feed force to overcome friction during feed operations.
2Power
If high torque loads are transmitted through the profile shaft and hub, then screwing capability is improved, but feed drive size and cost increase
Solution Approach 1:
By modifying the profile geometry with oblique toothing at a specific inclination angle, the patent enables the feed drive to utilize both the applied feed force and the axial component of torque transmission. This parameter change allows high screwing capability to be achieved without proportionally increasing feed drive size, as the oblique profile efficiently converts torque into useful feed force.
Solution Approach 2:
The oblique profile toothing serves multiple functions simultaneously: it transmits torque from the profile shaft to the hub and generates axial feed force to assist the feed drive. This multi-functionality reduces the burden on the feed drive system, allowing high power screwing operations with a more compact and cost-effective feed drive design.
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 oblique profile toothing reduces feed resistance, enabling a smaller and less expensive feed drive while maintaining efficient torque transmission, suitable for high-torque screwing operations.
Implementation Method 1
the frictional force also increases, thus inhibiting the feed motion
Implementation Method 2
the oblique profile toothing generates an axial feed force that counteracts frictional forces
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
The rotating tool, in particular a screw device (2) for screwing a screw element into a component, comprises a tool holder (16) for a screw tool (18), an axially fixed rotary drive (4) for generating a rotary motion and a torque, a feed drive (14) for generating a feed motion, and a telescopic transmission unit (10) with two components that are axially displaceable relative to each other (A), namely a profile shaft (6) and a hub (8) displaceable along this shaft with an internal profile corresponding to the profile shaft (6), wherein one component is connected to the rotary drive (4) and the other component is connected to the feed drive (14) and the tool holder (16), and the rotary motion generated by the rotary drive (4) is transmitted from one component to the other.To at least partially compensate for an axial frictional force (FRax) generated in this process which opposes the feed motion, the profile shaft (6) and the hub (8) are interlocked via a profile toothing (22) oriented obliquely to an axial direction (A).