Rail Vehicle Traction Motor Mounting via Transverse Fastening
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Solution Overview
Problem
The existing designs for attaching traction motors to bogie frames in rail vehicles require significant transverse movement during assembly or disassembly, leading to space constraints and increased complexity, as the motor must be moved considerable distances to engage and disengage with the bogie frame, and this space is only needed during installation, wasting valuable installation space.
Innovation Solution
A chassis unit with a fastening element that forms a projection for captive fixing of the traction motor unit, allowing it to be moved along the shortest path by interacting via form-fitting mechanisms in the vertical and transverse directions, reducing the required assembly channel and simplifying the assembly process by minimizing evasive movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traction motor unit is hung from above in the bogie frame using a support arm with form-fit connections, then the motor is securely fixed to the bogie frame, but the motor must be moved by a considerable transverse distance during assembly or disassembly, requiring large installation space
Solution Approach 1:
The patent inverts the conventional assembly approach by moving the fastening element (projection) with the motor unit during assembly, rather than moving the entire motor unit along a complex transverse path. The projection is designed to be movable relative to the motor holding device, allowing the motor to be positioned first and then secured by bringing the projection into engagement, thereby reversing the sequence of operations to minimize space requirements
Solution Approach 2:
The fastening connection is segmented into two independent form-fit interactions: one between the fastening element and the motor holding device, and another between the fastening element and the traction motor unit. This segmentation allows the fastening element to move independently to engage with each component, eliminating the need for the motor unit to traverse a large transverse distance and reducing the required assembly channel to minimal dimensions
2Reliability
If the motor is securely fixed using form-fit connections in the assembled state, then the motor is held captive on the bogie frame, but the assembly channel must be kept clear of the projection during motor movement, increasing space requirements
Solution Approach 1:
The fastening element (projection) is designed with dynamic characteristics, allowing it to move relative to the motor holding device during assembly and then be secured in its locked position. This dynamic design enables the projection to clear the assembly channel during motor movement and then engage with the motor unit, simplifying the assembly path from a complex evasive route to a straightforward linear movement
3Device complexity
If the projection is used for both form-fit connection to the bogie frame and for motor engagement, then the structure is simplified, but the assembly path becomes complex requiring evasive movements
Solution Approach 1:
The patent segments the fastening function by providing separate form-fit interactions: one between the fastening element and the motor holding device, and another between the fastening element and the traction motor unit. This segmentation allows each component to have its own engagement path, enabling the motor to move along a simple linear assembly channel while the fastening element independently engages with both the holding device and the motor, thus simplifying both structure and operation
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 design allows for easy installation of the traction motor unit in confined spaces with reduced complexity and space requirements, enabling a straightforward linear movement during assembly and disassembly, thereby alleviating space constraints and simplifying the installation process.
Implementation Method 1
the fastening element in the locking position for supporting the traction motor unit in the height direction interacting with the motor holding device via a first form fit acting in the height direction and with the traction motor unit via a second form fit acting in the height direction
Data Source
AI summary
The invention relates to a chassis unit for a vehicle, in particular a rail vehicle, having a motor accommodating device (103), in particular a chassis frame, and an attachment device (105), which can be connected to the motor accommodating device (103), for a traction motor unit (104), wherein the motor accommodating device (103) defines a longitudinal direction, a lateral direction, a vertical direction and an upper side and an underside (103.4) in the vertical direction. The motor accommodating device (103) is designed to be supported in the vertical direction on at least one wheel unit which is to be driven by the traction motor unit (104). The attachment device (105) is designed to support the traction motor unit (104) in a substantially rigid fashion on the motor accommodating device (103) in the vertical direction by means of at least one positive engagement. The attachment device (105) is also embodied in such a way that, in order to mount the traction motor unit (104) on the motor accommodating device (103) on a mounting path (108), in particular from the underside (103.4) of the motor accommodating device (103), the traction motor unit (104) can be inserted into the motor accommodating device (103). The attachment device (105) has at least one attachment element (106) which can be engaged with the motor accommodating device (103) and the traction motor unit (104). This attachment element (106) can be moved into a locked position in a locking direction running transversely with respect to the mounting direction, when traction motor unit (104) is located in the region of the support position, wherein the attachment element (106) interacts in the locked position for supporting the traction motor unit (104) in the vertical direction with the motor accommodating device (103) via a first positive engagement acting in the vertical direction and with the traction motor unit (104) via a second positive engagement acting in the vertical direction.