Overload Coupling Clamping Hub Torque Adjustment
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Solution Overview
Problem
Existing overload clutches in drive technology face issues with elastic deformations in clamping slots, leading to reduced clamping forces and potential breakage of clamping screws, and require complex spring layering changes for torque adjustments, which complicates torque range conversions and assembly/disassembly.
Innovation Solution
A two-part clamping hub design with a clamping ring and hub body, utilizing tempered steel and a non-rotatable connection between the hub and clamping ring, along with a specialized clamping screw lead angle, ensures backlash-free torque transmission and secure clamping forces, allowing for simpler spring changes and torque adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher tightening torques are applied to the clamping screw to increase clamping forces, then the security of the clamped connection is improved, but elastic deformations in the clamping slot occur leading to bending of the clamping screw and potential breakage
Solution Approach 1:
The hub is divided into a hub body and a separate clamping ring that can be independently replaced. The clamping ring absorbs the elastic deformations and bending stresses, protecting the clamping screw from breakage while maintaining high clamping forces on the shaft connection.
Solution Approach 2:
The lead angle of the clamping screw thread is optimized to minimize bending moments on the screw while maintaining high clamping forces. The geometric parameters of the thread and countersink are specifically designed to reduce elastic deformations in the clamping slot area.
2Weight of moving object
If a two-part hub design with clamping ring is used to achieve compact design and low mass moment of inertia, then the dynamics of the drive train is improved, but the complexity of assembly and disassembly increases
Solution Approach 1:
The hub is segmented into a hub body and a clamping ring that can be independently assembled and disassembled. The clamping ring with integrated clamping screw can be quickly installed and removed from the hub body, facilitating maintenance and torque adjustments without complex procedures.
Solution Approach 2:
The clamping ring is designed with a clamping screw that can be adjusted to different torque values, allowing dynamic adaptation of the clamping force. The scale and reference mark system enables quick visual verification of the set torque, simplifying the adjustment process.
3Ease of operation
If the scaling is arranged on the cylindrical surface of the clamping ring to enable convenient reading and changing of set torque, then the ease of adjustment is improved, but a non-rotatable connection between hub body and clamping ring is required increasing structural complexity
Solution Approach 1:
The scaling is integrated directly onto the cylindrical surface of the clamping ring, combining the measurement function with the structural component. The reference mark on the clamping ring aligns with the scale to provide direct visual feedback of the set torque, eliminating the need for separate measurement devices.
Solution Approach 2:
A non-rotatable connection element (such as a keyway or positioning feature) is introduced between the hub body and clamping ring to prevent relative rotation. This intermediary element ensures that the scale reading accurately reflects the clamping torque while maintaining the structural integrity of the assembly.
4Adaptability or versatility
If multiple plate springs are used to cover all torque ranges, then the adaptability to different torque requirements is improved, but the complexity of spring layering changes increases when torque adjustment is needed
Solution Approach 1:
Instead of changing the number or configuration of plate springs, the torque range is adjusted by modifying the preload force applied by the adjusting nut. The scale on the clamping ring provides direct reading of the set torque, allowing continuous adjustment within a wide range without reconfiguring the spring layering.
Solution Approach 2:
The adjusting nut mechanism serves multiple functions: it applies preload to the plate springs, sets the clamping torque, and provides a readable indication of the set torque value through the scale alignment. This multi-functional design eliminates the need for separate adjustment mechanisms for different torque ranges.
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 provides a compact, low-inertia coupling with higher clamping forces, minimizing screw bending moments and enabling precise torque adjustments, ensuring reliable and secure torque transmission in highly dynamic drives.
Implementation Method 1
the clamping force required for the frictional connection of shaft and hub is preferably generated with just one tangentially arranged clamping screw
Implementation Method 2
higher tightening torques of the clamping screw and thus higher clamping forces can be achieved by realizing a certain lead angle on the clamping ring or on the clamping hub between the thread and the through hole or head countersink for the clamping screw during manufacture. This minimizes the bending moments on the screw
Implementation Method 3
a non-rotatable connection between the hub body and the clamping ring, which is implemented in the overload clutch according to the invention by a screw or a pin, preferably a clamping sleeve, which is pressed into a radially arranged bore in the clamping ring and engages in a slot in the hub shoulder
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Overload coupling having a hub 1 having a hub clamping shoulder 1.1, having a clamping ring 2 which is arranged on the former, configured with a clamping slot 2.3 which is bridged by means of a clamping screw 7, and having a torque transmitting mechanism which operates in a form-fitting manner and the response torque of which can be changed by means of a prestress of disc springs 6 which can be set via the adjusting nut 3, wherein there is form-fitting fixing in the rotational direction between the hub 1 and the clamping ring 2, which form-fitting fixing is achieved by a pin 5 which engages in a longitudinal slot 1.2 of the hub shoulder 1.1 and is situated in the radial bore 2.6 of the clamping ring 2. As a result of the two-part clamping connection with fixing of the hub 1 with respect to the clamping ring 2, torque reading, form-fitting securing of the adjusting nut 3, simple mounting and dismantling and increased safety in the clamping connection are achieved (figure 2).