Bogie Shaft End Structure Integrating Speed Measurement and Grounding
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Solution Overview
Problem
The design of low-floor vehicle bogie shaft ends faces challenges in integrating speed measurement and grounding functions due to compact space and increased functional requirements, leading to complexity and poor lubrication issues.
Innovation Solution
The proposed solution optimizes the bogie shaft end structure by integrating speed measurement and grounding functions using a speed measuring gear with speed measuring teeth and a friction disc, combined with a shaft end front cover that includes speed sensor and grounding device interfaces, effectively utilizing the limited space and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are arranged on different bogie shaft ends, then speed measurement and grounding functions are achieved, but the bogie complexity and wiring difficulty increase
Solution Approach 1:
The patent combines the speed sensor interface and grounding device interface into a single integrated shaft end structure. The speed measuring gear with teeth engages with a speed sensor, while a friction disc provides grounding contact, both housed within the same shaft end assembly. This merging eliminates the need for separate sensor arrangements on different shaft ends, reducing bogie complexity and wiring difficulty while maintaining functional reliability
Solution Approach 2:
The shaft end structure serves multiple functions simultaneously: it provides speed measurement through the gear-tooth interface, grounding through the friction disc contact, and structural support. This multi-functionality allows a single component to replace what would traditionally require multiple separate components and wiring connections, directly addressing the complexity issue
2Volume of moving object
If the shaft end structure is made compact to save space, then space utilization improves, but the layout of sensors and grounding devices becomes difficult
Solution Approach 1:
The patent utilizes radial and axial dimensions efficiently within the compact shaft end structure. The speed measuring gear is positioned radially outward from the axle, while the friction disc is arranged axially adjacent to it. This multi-dimensional arrangement allows both sensing and grounding functions to coexist in a compact volume without interfering with each other's layout and installation
3Ease of operation
If the shaft end bearing is exposed to the environment, then access and maintenance are easier, but foreign dust and water contaminate the grease causing poor lubrication
Solution Approach 1:
The patent employs a sealed shaft end structure with a front cover that encloses the bearing, speed measuring gear, and friction disc. This sealing barrier prevents foreign dust and water from entering the bearing grease while maintaining a compact design. The sealed structure protects lubrication performance without significantly complicating access and maintenance procedures
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 integration simplifies the bogie design, reduces wiring complexity, ensures accurate assembly, and maintains good lubrication performance by preventing external contaminants from entering the shaft end bearing, thus enhancing the reliability and efficiency of the low-floor vehicle.
Implementation Method 1
an outer end face of the speed measuring gear is provided thereon with multiple speed measuring teeth that are evenly distributed in the circumferential direction; the shaft end front cover is provided thereon with a speed sensor interface and a brush interface that are arranged corresponding to the speed measuring teeth and the friction disc respectively
Implementation Method 2
the friction disc is fixedly connected to the speed measuring gear, and is specifically arranged on the outer end face, outside the speed measuring teeth in a radial direction, of the speed measuring gear; the shaft end front cover is provided thereon with a speed sensor interface and a brush interface that are arranged corresponding to the speed measuring teeth and the friction disc respectively
Data Source
Figure 1
Figure 2
AI summary
A low-floor vehicle, a bogie and a shaft end structure thereof, the shaft end structure comprising a speed measuring gear (1) and a friction disc (2), wherein the speed measuring gear (1) that has a central through hole (11) is used to fixedly connect to an end face of a vehicle wheel (10), and an outer end face of the speed measuring gear (1) is provided thereon with several speed measuring teeth (121) that are uniformly distributed in the circumferential direction; the friction disc (2) is fixedly connected to the speed measuring gear (1), and is specifically arranged on the outer end face of the speed measuring gear (1) on the radial outer periphery of the speed measuring teeth (121); a shaft end front cover (3) is mounted on an outer side of the speed measuring gear (1) and the friction disc (2), and a central part of the body of the shaft end front cover (3) is used to traverse the central through hole (11) of the speed measuring gear (1) and fixedly connect to a shaft end of an axle (20); and the shaft end front cover (3) is provided thereon with a speed sensor interface (31) and a brush interface (31) that are arranged corresponding to the speed measuring teeth (121) and the friction disc (2) respectively. The shaft end structure of the bogie is optimized, making full use of the space of the shaft end to integrate grounding and speed measuring functions into one bogie shaft end. The structure is simple and reliable, which reduces the degree of complexity of the bogie design and further reduces the difficulty of wiring.