Transmission Bearing Preload Structure for Precise Bevel Gear Backlash
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transmission systems with bevel gears face challenges in precisely adjusting backlash due to manufacturing tolerances, requiring complex measurement and limited adjustment accuracy with traditional shim-based methods.
Innovation Solution
A transmission system with an adjustable roller bearing that allows axial adjustment of bevel gears via a fine thread arrangement, enabling precise backlash adjustment without the need for precise component measurement and improving assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional shim-based adjustment method is used, then assembly is simple, but adjustment precision is limited
Solution Approach 1:
The patent transitions from static shim-based adjustment to dynamic threaded adjustment, allowing continuous modification of backlash during operation. The threaded connection enables the bearing assembly to be adjusted axially by rotating the adjusting nut, providing dynamic control over gear mesh clearance.
Solution Approach 2:
The invention changes the adjustment parameter from discrete shim thickness to continuous threaded rotation. By using a fine-pitch thread (e.g., 1 mm pitch), small rotational movements translate to precise axial displacements, enabling fine-tuned backlash adjustment that overcomes the limited precision of shim thickness variations.
2Manufacturing precision
If threaded adjustment is used, then adjustment precision improves, but axial fixation becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-tensioning the threaded connection during assembly. The adjusting nut is tightened to create preload forces that lock the bearing assembly in the desired axial position before operation begins, preventing subsequent unintended rotation or displacement.
Solution Approach 2:
The invention implements preliminary anti-action by designing the threaded connection with inherent friction and preload that resist unintended rotation. The pre-tensioned state creates opposing forces that counteract operational loads attempting to change the axial position, maintaining stability without requiring additional locking mechanisms.
3Stability of the object's composition
If preload force is increased to prevent rotation, then position stability improves, but operating load capacity is reduced
Solution Approach 1:
The patent applies local quality by concentrating the preload function in the adjusting nut region while maintaining load-bearing capacity in the bearing and gear mesh regions. The threaded connection is designed with appropriate thread geometry and material properties to achieve high preload forces locally without compromising the overall load transmission path.
Solution Approach 2:
The invention utilizes the curved geometry of the thread profile to convert rotational motion into axial preload. The helical shape of the thread acts as an inclined plane, allowing moderate rotational forces to generate significant axial preload forces through mechanical advantage, thereby achieving high stability without excessive operating loads.
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 system achieves precise and simple backlash adjustment between bevel gears, enhancing the transmission's operational accuracy and reducing the risk of unwanted twisting through pre-tensioning and clamping mechanisms.
Implementation Method 1
The axial position of the outer ring of the rolling bearing is adjustable by means of a threaded arrangement, which has an internal thread fixed in the gearbox housing and an external thread cooperating with the internal thread, which is formed on an adjusting nut of the adjusting device
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a transmission (11) comprising a transmission housing (12), a drive shaft (13) rotatably mounted in the transmission housing (12) by means of a first bearing arrangement (14.1), and an output shaft (16) rotatably mounted in the transmission housing (12) by means of a second bearing arrangement (14.2), wherein the transmission (11) includes an adjusting nut (24.2) which has an end ring wall against which an outer ring (20.2) of a rolling bearing (18.2) of an adjusting device (17) for adjusting backlash in the transmission (11) is supported with its first end face, and a second end face of the outer ring (20.2) opposite the first end face is directed towards a shoulder (41) on the transmission housing (12), wherein a tension spring device (42) is inserted in an annular gap formed between the second end face of the outer ring (20.2) and the shoulder (41), which is designed to The outer ring (20.2) is to be clamped axially against the end ring wall of the adjusting nut (24.2).