Angular Bolt Gear Mechanism With Pretensioned Low-Backlash Carriers
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Solution Overview
Problem
Bolt type angular gear mechanisms face inadequate torsion resistance and excessive guide play or circumferential backlash when transmitting rotational movement between shafts oriented at an angle, limiting their effectiveness.
Innovation Solution
The mechanism employs angular bolts with receiving members arranged on multiple reference circles with varying diameters and angular spacings, connected by bolt carriers with conical front sides, allowing for pretensioning and reduced play through differential torsion and angular offset, enhancing torsion resistance and minimizing backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional angular bolts are used in bolt type angular gear mechanisms, then the mechanism can transmit rotational movement between angled shafts, but the torsion resistance is inadequate
Solution Approach 1:
The receiving members are arranged with asymmetric angular spacings on reference circles, where at least two different angular spacings are used. This asymmetric arrangement creates differential torsion in the angular bolts, generating pretension forces that significantly improve torsion resistance and eliminate guide play and circumferential backlash.
2Reliability
If conventional receiving member arrangement is used, then the structure is simple, but excessive guide play and circumferential backlash occur
Solution Approach 1:
Different receiving members are arranged on reference circles with different angular spacings, creating local variations in the bolt carrier structure. This local quality differentiation enables selective pretensioning of specific angular bolts, effectively reducing guide play and circumferential backlash in critical areas without requiring complete structural redesign.
3Strength
If equal angular spacings are used for receiving members, then the manufacturing is easier, but the torsion resistance remains insufficient
Solution Approach 1:
The angular spacings between receiving members are varied as a design parameter, with at least two different angular spacing values used on the reference circles. This parameter change transforms the uniform bolt loading into differential torsion loading, generating the pretension forces necessary for high torsion resistance while maintaining manufacturability through standard machining practices.
Data Source
AI summary
Bolt type angular gear mechanism (1) for transmitting a rotational movement from a first shaft to a second shaft which is orientated at an angle with respect to the first shaft, comprising a plurality of angular bolts (31, 32) each having two members, a first bolt carrier (21) which can be rotated about a first axis and which has receiving members (4) for the first members of the angular bolts (31, 32) in each case, a second bolt carrier (22) which can be rotated about a second axis and which has receiving members (4) for the second members of the angular bolts (31, 32) in each case so that the bolt carriers (21, 22) are connected by means of the angular bolts (31, 32), wherein the axes define an angle, and wherein the members of the angular bolts (31, 32) are each constructed in a cylindrical manner as far as a plane of the angle bisector between the axes.