High-Friction Locking Device for Wind Turbine Braking Systems
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Summary
Problems
Conventional braking systems for wind turbines, such as pitch and azimuth brakes, face challenges with low coefficient of friction, which are further reduced by environmental factors like dirt, oil, and temperature, requiring stronger actuators and increased manufacturing and maintenance costs, and are unable to precisely lock components at varying angles for optimal wind energy utilization.
Innovation solutions
The development of a locking device with a braking surface featuring wedge-shaped cutting edges or cylindrical section-shaped brake beads arranged in a V-shape or transverse to the direction of movement, providing a high coefficient of friction that is independent of environmental influences and capable of locking components from different and changing directions, with features like longitudinally displaceable cutting edges and resiliently mounted sliding strips to enhance locking efficacy and reduce wear.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional brake pads are used with frictional engagement, then the braking system can lock rotating or linearly moving components, but the coefficient of friction is low (0.6) and decreases with dirt, oil, and lower temperatures, requiring stronger and more expensive actuators
Why choose this principle:
The invention changes the physical state and geometry of the braking surface by providing wedge-shaped cutting edges instead of conventional flat brake pads. These cutting edges mechanically engage with the braking partner surface, transforming the friction mechanism from surface friction to geometric interlocking, thereby achieving a significantly increased coefficient of friction that is independent of environmental influences like dirt, oil, and temperature
Principle concept:
If conventional brake pads are used with frictional engagement, then the braking system can lock rotating or linearly moving components, but the coefficient of friction is low (0.6) and decreases with dirt, oil, and lower temperatures, requiring stronger and more expensive actuators
Why choose this principle:
The braking surface combines the base brake pad material with integrated wedge-shaped cutting edges made of wear-resistant material. This composite structure allows the softer base material to provide friction while the harder cutting edges provide mechanical engagement, creating a multi-functional braking surface that achieves high friction coefficients without requiring proportionally higher actuator forces
Application Domain
Data Source
AI summary:
The development of a locking device with a braking surface featuring wedge-shaped cutting edges or cylindrical section-shaped brake beads arranged in a V-shape or transverse to the direction of movement, providing a high coefficient of friction that is independent of environmental influences and capable of locking components from different and changing directions, with features like longitudinally displaceable cutting edges and resiliently mounted sliding strips to enhance locking efficacy and reduce wear.
Abstract
The invention relates to a clamping jaw for locking devices for components which are arranged in a rotatable and/or displaceable manner, the locking device having a brake rail (9), wherein either the brake rail (9) or the clamping jaw (12) is fixedly connected to the component which is arranged in a rotatable and/or displaceable manner. The clamping jaw (12) has a braking surface (13), which faces the brake rail (9) and has a braking profile that extends substantially transversely to the direction of movement of the component, is in operative connection with an actuator (11) and can be moved by the latter against the brake rail (9), whereby the braking profile exerts a locking effect on the surface of the brake rail (9). According to the invention, the braking profile that extends substantially transversely to the direction of movement of the component is composed of blades (14) that engage into the brake rail (9) or of a plurality of cylinder portions (23) which are arranged one behind the other in the direction of movement of the component and emerge in a bead-like manner from the braking surface (13), wherein the blades (14) or cylinder portions (23) are arranged in a V-shape on the braking surface (13) of the clamping jaw (12). The braking profile can also be arranged on the brake rail which in this case is made of a harder material than that of the braking surface of the clamping jaws.