Screw Foundation Driving Device Rolling Body Torque Transmission
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Solution Overview
Problem
Existing screw foundation driving devices experience surface destruction due to friction between contact-surface pairs, particularly when impact and torque are applied simultaneously, leading to wear issues.
Innovation Solution
A driving device with an outer rotor and anchor featuring rolling bodies in grooves that allow for relative movement and torque transmission, minimizing friction through the use of rolling-bearing cages and a damping element to absorb shocks, and a seal to prevent dust and dirt ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If contact-surface pairs are used for torque transmission in impact devices, then torque can be transmitted from motor shaft to drive shaft, but friction arises that destroys the surface of the contact-surface pairs over time
Solution Approach 1:
The patent replaces flat contact-surface pairs with spherical rolling bodies (balls) that roll between the motor shaft and drive shaft. This curvature transformation converts sliding friction into rolling friction, dramatically reducing surface wear while maintaining torque transmission capability. The rolling bodies move along curved paths defined by grooves in both shafts.
Solution Approach 2:
The rolling bodies serve as intermediary elements between the motor shaft and drive shaft. Instead of direct contact between the two shafts, the rolling bodies mediate the torque transmission, allowing relative movement while minimizing friction. This intermediary mechanism protects both shaft surfaces from direct frictional damage.
2Force
If the diameter of contact-surface pairs is increased to reduce mechanical load, then friction load is reduced, but the device complexity and space requirements increase
Solution Approach 1:
By using spherical rolling bodies, the patent achieves torque transmission with significantly reduced frictional load compared to flat contact surfaces. The rolling mechanism concentrates the contact force at a point rather than distributing it across a large area, allowing for more compact designs without increasing mechanical load on the surfaces.
Solution Approach 2:
The patent introduces a new dimension of motion by using rolling bodies that can both rotate on their axes and translate along grooves. This adds a rotational degree of freedom that enables torque transmission while reducing the need for large diameters, as the rolling action provides mechanical advantage through the radius of the rolling bodies themselves.
3Reliability
If rolling bodies are used for torque transmission, then friction is minimized and wear is reduced, but the device complexity increases due to additional components
Solution Approach 1:
The rolling bodies perform multiple functions simultaneously: they transmit torque from the motor shaft to the drive shaft, accommodate relative axial movement between the shafts, and minimize friction through rolling contact. This multi-functionality reduces the need for separate components for each function, offsetting the added complexity of introducing rolling bodies.
Solution Approach 2:
The patent combines the torque transmission function with the relative movement accommodation function into a single integrated mechanism using rolling bodies in grooves. The grooves themselves serve dual purposes: guiding the rolling bodies and enabling axial displacement. This merging of functions reduces the number of separate components needed compared to traditional designs.
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 solution reduces wear and enhances torque transmission while maintaining durability, allowing for efficient and impact-resistant operation of screw foundations and drilling tools.
Implementation Method 1
The torque can be transmitted via the rolling bodies. The rolling bodies are preferably arranged in grooves, in particular a plurality of grooves both in the outer rotor and in the anchor. The friction is thus minimised.
Implementation Method 2
an impact device from which an impact energy can be introduced into the anchor
Implementation Method 3
The driving device has an outer rotor, which is arranged concentrically to the rotational axis of the anchor and can be rotationally driven by a motor
Data Source
AI summary
The invention relates to a driving device, in particular a screw foundation driving device, having an anchor with a rotational axis for receiving a driving tool, an outer rotor, which is arranged concentrically to the rotational axis of the anchor and can be rotationally driven by a motor, and an impact device from which an impact energy can be introduced into the anchor. By means of rolling bodies arranged circumferentially on the anchor, the anchor is mounted in the outer rotor in such a way that a relative movement between the anchor and the outer rotor can be executed in the direction of the rotational axis and a torque about the rotational axis can be introduced from the outer rotor to the anchor via the rolling bearings.