Vehicle Speed Sensor Clamping Sleeve Anti-Rotation Design
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Solution Overview
Problem
Existing rotary encoder arrangements face challenges in preventing rotation of the sensor head within the clamping sleeve without relying on a connection adapter that protrudes radially beyond the clamping sleeve, which can complicate the design and increase dimensions.
Innovation Solution
The sensor head features a non-cylindrically symmetrical cross-section with an orientation surface, interacting with inwardly pointing orientation elements in the clamping sleeve, allowing for torsion-proof axial displacement without the need for a radially protruding connection adapter, utilizing clamping and positioning elements like rigid domes and spring elements for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection adapter with radially protruding guide pins is used to prevent rotation of the sensor head, then the sensor head is securely positioned in terms of orientation, but the device complexity increases and the radial dimension is increased
Solution Approach 1:
The invention extracts the anti-rotation function from the connection adapter and relocates it to the clamping sleeve itself. The clamping sleeve incorporates outwardly bent tabs that engage with recesses in the holder bore, eliminating the need for radially protruding guide pins on the connection adapter. This reduces structural complexity while maintaining secure rotational positioning.
Solution Approach 2:
The invention merges the anti-rotation function with the clamping sleeve structure. The outwardly bent tabs on the clamping sleeve integrate the positioning and clamping functions into a single component, eliminating the need for separate guide pins on the connection adapter. This consolidation reduces the number of parts and simplifies the overall structure.
2Reliability
If a connection adapter with radially protruding guide pins is used to prevent rotation, then the sensor head orientation is fixed, but the radial dimension of the device increases
Solution Approach 1:
The invention removes the radially protruding guide pins from the connection adapter by extracting the anti-rotation function and implementing it within the clamping sleeve structure. The outwardly bent tabs on the clamping sleeve engage with the holder bore to provide the necessary rotational constraint without increasing the radial dimension.
3Adaptability or versatility
If the sensor head is made axially displaceable in the clamping sleeve, then the encoder can adjust to tolerances and thermal expansion, but the sensor head may rotate freely without proper orientation constraint
Solution Approach 1:
The sensor head is divided into two functional sections: a first section with a non-cylindrically symmetrical cross-section that engages with orientation elements in the clamping sleeve to prevent rotation, and a second cylindrically symmetrical section that allows axial displacement. This segmentation enables the sensor head to maintain proper orientation while accommodating axial movement for tolerance compensation.
Solution Approach 2:
The first section of the sensor head features a non-cylindrically symmetrical cross-section with an orientation surface that interacts with corresponding orientation elements in the clamping sleeve. This asymmetry ensures that the sensor head can only be inserted into the clamping sleeve in the correct rotational orientation, preventing free rotation while allowing axial displacement.
4Reliability
If outwardly bent tabs on the clamping sleeve are used for anti-rotation, then the sensor head is securely positioned, but the clamping sleeve structure becomes more complex
Solution Approach 1:
The outwardly bent tabs on the clamping sleeve combine the clamping and anti-rotation functions into a single integrated structure. These tabs engage with recesses in the holder bore to prevent rotation of the clamping sleeve, while the spring elements provide the necessary clamping force. This merging of functions eliminates the need for separate anti-rotation mechanisms.
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
This arrangement ensures the sensor head is held in a torsion-proof and axially displaceable manner, maintaining measurement accuracy while allowing for space-saving design and robust construction, suitable for various environmental conditions.
Implementation Method 1
at least one clamping and positioning element, in particular comprising at least one rigid dome and a spring element opposite it
Implementation Method 2
the rotary encoder with a sensor head is held axially displaceable in the clamping sleeve by frictional locking
Data Source
Figure 1
Figure 2a~2c
Figure 2b
AI summary
The invention relates to an arrangement of a rod-shaped vehicle speed sensor (20) and clamping sleeve (10) in a bore (2) of a holder (1) in order to sense the speed of rotation of a rotor (4), wherein the clamping sleeve (10) is secured against rotation in the bore (2) and a sensor head (22) of the vehicle speed sensor (20) is interlockingly retained in the clamping sleeve (10) so as to be axially movable. The invention is characterised in that the sensor head (22) has at least in some sections a cross-section that is not cylindrically symmetrical, and the clamping sleeve (10) comprises at least one inward-facing position-setting element (17), by means of which the sensor head (22) is secured against rotation in the clamping sleeve (10).