Detent Fitting Layout for Overlapping Free-Pivoting Range
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Solution Overview
Problem
Conventional detent fittings with three locking pawls have limited pivoting ranges due to the periodic repetition of guiding contours, which restricts the angular movement and may lead to contact with the toothing, potentially causing damage.
Innovation Solution
Displacing free-pivoting sections and associated guiding contours in the axial and radial directions relative to the rotational axis allows for an overlapping angular range without interference, enabling a pivoting range larger than 120° by preventing locking pawls from engaging with the toothing during the free-pivoting range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If guiding contours with free-pivoting sections are periodically repeated for three locking pawls, then locking is prevented in free-pivoting ranges, but the pivoting range is limited to maximum 120°
Solution Approach 1:
The patent applies dimensional displacement by positioning free-pivoting sections at different axial and radial positions relative to the rotational axis. This spatial differentiation in multiple dimensions allows guiding contours to overlap angularly without interference, enabling the pivoting range to exceed 120° while maintaining the free-pivoting function for all three locking pawls
2Length of moving object
If only one locking pawl cooperates with free-pivoting sections, then larger pivoting range is achieved, but locking pawls may contact toothing and cause damage
Solution Approach 1:
The patent positions free-pivoting sections at different axial and radial positions for each locking pawl, creating spatially separated guiding contours that overlap angularly. This dimensional arrangement allows all three locking pawls to have free-pivoting sections, preventing any pawl from contacting the toothing during pivoting while achieving a pivoting range larger than 120°
Solution Approach 2:
The patent creates asymmetric positioning of free-pivoting sections relative to the rotational axis, with each section located at unique axial and radial coordinates. This asymmetric arrangement ensures that guiding contours for different locking pawls do not interfere with each other, allowing simultaneous free-pivoting functionality for all pawls without limiting the pivoting range
Data Source
AI summary
A detent fitting for locking two vehicle parts comprises a first vehicle part, a second vehicle part which is arranged pivotably about a rotational axis with respect to the first fitting part and three locking pawls which are arranged displaceably on the first fitting part, the locking pawls being designed and provided to be brought into engagement with a toothing of the second fitting part for locking the first fitting part with respect to the second fitting part and to be brought out of engagement with the toothing of the second fitting part for releasing the locking. Each locking pawl is associated with a free-pivoting section on the second fitting part, the locking pawl interacting with the free-pivoting section when turning the second fitting part relative to the first fitting part and the free-pivoting section being designed and provided to prevent an engagement of the locking pawl with the toothing of the second fitting part in a predefined angular range. According to the invention it is provided that at least one of the free-pivoting sections (62, 66, 72; 811, 821, 831) is displaced in the axial and/or radial direction with regard to the rotational axis (A) with respect to the other free-pivoting sections (62, 66, 72; 811, 821, 831). In this way a detent fitting comprising three locking pawls is provided which comprises a larger pivoting range.