L-Shaped Vehicle Chassis Runners with Recessed Lift Cylinder Support
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Solution Overview
Problem
Prior vehicle chassis designs are limited by oversized and heavy construction due to the need for welds or bolts to support lift cylinders, leading to stress concentrations, reduced load capacity, and susceptibility to metal fatigue.
Innovation Solution
The vehicle chassis features L-shaped runners with a recessed lift cylinder support, forming a continuous integral wall without welds or bolts, optimizing load transfer and reducing stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a lift cylinder support housing is welded to a runner of the vehicle chassis, then the connection provides structural support, but the welded connection area experiences stress concentrations and metal fatigue leading to reduced reliability
Solution Approach 1:
The patent merges the lift cylinder support housing with the runner by making them integrally formed as a single piece, eliminating the welded connection between these components. This integration removes the stress concentration point that would otherwise exist at the weld joint, thereby improving reliability while maintaining structural support strength.
2Strength
If the lift cylinder support housing and runner are oversized in size and weight, then the load capacity increases, but the vehicle chassis weight increases leading to higher energy consumption
Solution Approach 1:
The patent applies local quality by providing reinforcement only in the specific area where the lift cylinder support housing is integrally formed with the runner, rather than oversizing the entire runner. This localized reinforcement approach increases load capacity at the critical support point while minimizing the overall weight increase of the chassis.
3Ease of manufacture
If bolts or through holes are used to connect the bracket and frame member, then the connection can be assembled, but the repeated loading and unloading causes metal fatigue and potential failure
Solution Approach 1:
The patent eliminates the need for bolts or through holes by integrally forming the lift cylinder support housing with the runner. This merging of components removes the mechanical fasteners that would otherwise be subjected to repeated loading and unloading, thereby eliminating the metal fatigue issue while maintaining assembly feasibility through integral forming processes.
Data Source
Figure 1
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AI summary
The present invention relates to a vehicle chassis, comprising: - two essentially parallel runners that extend in a longitudinal direction; - wherein a plane is defined by a bottom surface of the longitudinal direction of the parallel runners; - a lift cylinder support that is recessed relative to the plane defined by the runners; - wherein the runners comprise an L-shaped cross section in the longitudinal direction thereof, said L-shape comprising a short leg that extends from one of the parallel runners inward toward the other of the parallel runners, and a long leg that forms a side piece of the runner; - wherein the bottom surface of the runners is defined by the short legs; and - wherein a side piece of the lift cylinder support is integrally formed by a part of the side piece of the runner that extends beyond the plane defined by the bottom surface of the longitudinal direction of the parallel runners to thereby form a continuous integral wall of both the runner and the lift cylinder support. The invention further relates to a vehicle comprising such a vehicle chassis and a lift cylinder that is supported by the lift cylinder support.