Control Shaft Assembly with Hybrid Press-Fit and Thermal Jointing
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Solution Overview
Problem
Existing devices for jointing multiple functional elements with cutouts on a shaft either require high force for press-fit or low force for thermal jointing, limiting their flexibility in application.
Innovation Solution
A hybrid device using an electrical spindle drive and a pneumatic piston to displace a traversable guide carriage, allowing for both thermal jointing and press-fit assembly by adjusting the drive systems to accommodate varying force requirements, with additional features like stop contours and detection devices for precise control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pneumatic piston is used to displace the guide carriage, then thermal jointing with low force is achieved, but high-force press-fit jointing cannot be performed
Solution Approach 1:
The patent combines a pneumatic piston and an electrical spindle drive in a hybrid drive system. The pneumatic piston provides high-speed, low-force movement for thermal jointing, while the electrical spindle drive provides high-force capability for press-fit jointing. Both drives are merged to act on the same guide carriage, enabling the system to perform both thermal and press-fit jointing operations with a single device.
Solution Approach 2:
The guide carriage is designed with a universal interface that can be driven by either the pneumatic piston or the electrical spindle drive. This multi-functionality allows the same carriage to perform both thermal jointing (using pneumatic drive) and press-fit jointing (using electrical spindle drive), eliminating the need for separate specialized devices.
2Adaptability or versatility
If an electrical spindle drive is used to displace the guide carriage, then high-force press-fit jointing is achieved, but low-force thermal jointing becomes excessive
Solution Approach 1:
The drive system is designed to be dynamic and adaptable, allowing the operator to select between pneumatic and electrical drives based on the specific jointing task. The system can dynamically switch between high-force mode (electrical spindle for press-fit) and low-force mode (pneumatic piston for thermal jointing), optimizing force application for each operation type.
Solution Approach 2:
The drive function is segmented into two independent drive systems: a pneumatic piston for low-force applications and an electrical spindle drive for high-force applications. Each drive system is optimized for its specific force range, and they operate independently on the same guide carriage, allowing selective use based on jointing requirements.
3Adaptability or versatility
If a single drive system is used for the guide carriage, then device simplicity is maintained, but both thermal jointing and press-fit cannot be performed
Solution Approach 1:
The guide carriage serves as a universal platform that can interface with both pneumatic and electrical drive systems. This universal design allows a single carriage structure to support multiple drive types, enabling the system to perform both thermal and press-fit jointing without requiring separate carriages or complex transmission mechanisms.
Solution Approach 2:
The guide carriage acts as an intermediary element between the two different drive systems (pneumatic piston and electrical spindle drive) and the shaft assembly. It translates the motion from either drive type into the required linear movement for jointing, mediating between the different drive mechanisms and the workpiece.
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
Enables flexible assembly of functional elements with both low-force thermal jointing and high-force press-fit capabilities, enhancing the device's applicability and precision by dynamically adjusting to different force needs and preventing damage from excessive force.
Implementation Method 1
electrical spindle drive (6), by means of which the shaft (3) can be displaced in a traversable guide carriage (5)
Implementation Method 2
pneumatic piston (7), by means of which a maximum first press-in force can be applied onto the guide carriage (5)
Data Source
AI summary
A method for jointing elements, each having a cutout, on a shaft by a device for producing a control shaft, comprises disposing the elements vertically above one another, aligned, and fixed. The method also comprises pushing the shaft in vertically from above though the cutouts of the elements by a traversable guide carriage of the device and displacing by a pneumatic piston of the device the traversable guide carriage and the shaft attached thereto until a maximum first press-in force is reached. The method further comprises displacing by at least two spindles of an electric spindle drive of the device the traversable guide carriage and the shaft when the maximum first press-in force is exceeded.