90° Geared Universal Joint With Cross-Axle Vibration Control
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Solution Overview
Problem
Existing constant velocity joints face issues with maintaining a 90° diffraction angle without straining and preventing vibrations or gear skipping, especially at high torques, due to variable spring tension and limited angularity, which restricts their ability to transmit rotational movements uniformly and vibration-free.
Innovation Solution
The use of rotatably arranged joint forks connected by a cross-axle, decoupled from torque and speed transmission, allows for flexible movement up to 90° without tensile forces, ensuring smooth operation of spur- and bevel gears at varying speeds and angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If axially spring-loaded tension bolts are used to hold joint halves together, then the joint can maintain connection at high torques, but the joint tends to take a stretched position and vibrations or skipping of teeth can occur
Solution Approach 1:
The patent removes the spring-loaded tension bolts from the system entirely, replacing them with a cross-axle and bearing mechanism. This extraction eliminates the source of variable spring tension that caused the joint to strive for a stretched position and the resulting vibrations and tooth skipping.
Solution Approach 2:
The patent introduces a cross-axle with bearings as an intermediary mechanism between the joint halves. This intermediary allows the joint halves to be connected and rotate relative to each other without the need for spring-loaded tension bolts, providing stable connection without the stretched position tendency.
2Device complexity
If only one-dimensional angularity is provided by hinge-like bearing, then the joint structure is simple, but the bending movement is blocked in unfavorable positions and it is difficult to bring the joint out of stretched position
Solution Approach 1:
The patent transitions from one-dimensional angularity (single hinge axis) to two-dimensional angularity by providing the cross-axle with two perpendicular bearing axes. This allows the joint to deflect in multiple directions and prevents blocking in unfavorable positions while maintaining relatively simple structure.
3Power
If variable spring tension is applied to hold joint halves together, then the joint can transmit torque, but the joint constantly strives to move back from flexed position to stretched position
Solution Approach 1:
The patent removes the spring-loaded tension mechanism entirely, replacing it with a bearing-based connection on the cross-axle. This eliminates the variable spring tension that caused the joint to constantly strive to return to a stretched position, allowing the joint to remain stable in any angular position.
Solution Approach 2:
The patent replaces the spring-mechanical system with a bearing-mechanical system. The bearings on the cross-axle provide the necessary support and rotation capability without introducing elastic restoring forces, substituting a non-elastic mechanical connection for the spring-loaded one.
4Strength
If joint halves are held together by axially spring-loaded tension bolts, then connection is maintained, but the joint halves can shift to each other at high torque causing vibrations
Solution Approach 1:
The patent removes the spring-loaded tension bolts that caused the joint halves to shift under high torque. The cross-axle with bearings provides a more stable connection that prevents relative shifting between joint halves, eliminating the source of vibrations and tooth skipping.
Solution Approach 2:
The cross-axle with bearings acts as an intermediary that provides a stable, low-friction connection between joint halves. This intermediary mechanism prevents the direct contact and shifting that occurs with spring-loaded bolts, thereby eliminating vibrations and tooth skipping.
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 solution enables uniform rotational movement transmission up to 90° in any direction, preventing the joint from returning to a stretched position, and allows for continuous torque and speed transmission without vibration, even at high speeds, by decoupling the joint forks from the drive-train and using grease-filled lubrication for maintenance-free operation.
Implementation Method 1
using grease-filled lubrication for maintenance-free operation
Data Source
AI summary
Constant velocity joints or homokinetic joints are used for the continuous transmission of rotational movements and torques. They transmit the rotational movement of a driving shaft to a shaft to be driven without changing the speed or torque. The transmission takes place independently of the speed, torque, or the value of a diffraction angle and independently of the speed at which this diffraction angle changes. Constant velocity joints with a diffraction angle of 90° are equipped with specially shaped gear pairs, which are held together by a spring-loaded inner joint. In this joint transmission, a diffraction angle of 90° is achieved while the shafts to be connected to fixedly mounted bevel- and spur gear pairs are connected to each other, so that no spring-loaded inner joint is needed. Therefore, high engine speeds and high torques can be transmitted.