Railway Bogie Primary Suspension with Longitudinal Elastic Element
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Solution Overview
Problem
Conventional railway vehicle bogies are bulky in the direction of elevation due to the primary suspension design, which limits the ability to have two floors in line with the bogie, compromising passenger comfort and space, especially in double-deck vehicles.
Innovation Solution
The primary suspension device incorporates a force transmission rod and lever arrangement that articulates the elastic element to extend in a longitudinal direction, reducing bulk above the axle box and allowing the elastic element to absorb forces without increasing the bogie's vertical height, thereby reducing the overall bulk and enabling a lower profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic element is arranged to extend vertically between the axle box and the spar, then the primary suspension can effectively dampen deformations, but the bogie becomes bulky in the direction of elevation
Solution Approach 1:
The elastic element is reoriented from a vertical arrangement to a longitudinal arrangement, changing its orientation from the elevation direction to the longitudinal direction. This dimensional change allows the elastic element to maintain its damping function while reducing the bogie's height in the elevation direction, directly resolving the technical contradiction between damping capability and bogie bulk.
2Volume of moving object
If the bogie height is reduced to enable two floors in line with the bogie, then passenger space and comfort are improved, but the elastic element must be relocated to maintain suspension functionality
Solution Approach 1:
The elastic element is repositioned from a vertical arrangement to a longitudinal arrangement, extending in the longitudinal direction of the bogie rather than the elevation direction. This reorientation reduces the bogie's overall height, enabling two floors to be positioned in line with the bogie and increasing passenger compartment volume, while the force transmission rod and lever maintain the suspension functionality through articulated connections.
3Reliability
If the elastic element is extended in length to improve force absorption, then the damping performance is enhanced, but the bogie bulk in the elevation direction increases
Solution Approach 1:
The elastic element is oriented to extend in the longitudinal direction rather than the elevation direction, allowing it to achieve greater length for improved force absorption capability without increasing the bogie's height in the elevation direction. The force transmission rod and lever system transmits the forces effectively, maintaining suspension performance while reducing vertical bulk.
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 reduces the bogie's height by 200-450 mm, allowing for a lower floor profile in railway vehicles, enhancing passenger comfort and space utilization by enabling two floors in line with the bogie without compromising volume, particularly suitable for double-deck vehicles.
Implementation Method 1
an elastic element fixed on the one hand to the spar and on the other part to the axle box and arranged to allow movement in a direction of elevation
Data Source
Figure 1~2
Figure 3
AI summary
The bogie (10) comprises a frame (12) including a longeron (16) extending and at least one wheel (14), said wheel (14) being mounted on an axle box (18) and being rotatable relative to said axle box (18) about an axis of rotation (A), said axle box (18) being fixed to the longeron (16) by a primary suspension device (20) including an elastic element (28). The primary suspension device (20) includes at least one force-carrying connecting rod (34) articulated on one side to the axle box (18) and on the other side to a lever (36) articulated on the longeron (16), said lever (36) being further articulated to the elastic element (28) such that the elastic element (28) is fixed to the axle box (18) via the lever (36) and the connecting rod (34).