Seat Suspension Link Hook Elastic Member Load Adaptation
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Solution Overview
Problem
Existing seat suspension systems for work vehicles, such as those disclosed in JP 9-123817 A, face challenges in maintaining suspension function under varying loads, particularly when the seat receives a large load, and often require additional cushions to prevent sinking, which complicates the design and comfort of the ride.
Innovation Solution
A seat suspension system comprising a base, seat platform, first and second links, a link hook, and an elastic member, where the elastic member is latched to the base and link hooks, allowing the link hook to be pulled toward the base hook, increasing the angle between the elastic member's contraction direction and rotation direction as it expands, effectively managing seat sinking under different load conditions without the need for additional cushions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional cushions are added to prevent seat sinking, then the suspension function under large loads is improved, but the device complexity increases
Solution Approach 1:
The patent merges the suspension function and the load-adaptation function into a single integrated mechanism. The parallel links work together with the elastic member to provide both suspension and automatic adjustment for varying loads. The base hook and link hook are positioned to create a geometric relationship that inherently provides load-dependent suspension characteristics, eliminating the need for separate cushions or additional adjustment mechanisms.
Solution Approach 2:
The parallel link mechanism serves multiple functions simultaneously: it provides suspension support, automatically adapts to varying load conditions, and maintains effective suspension force across different operating ranges. The elastic member not only provides restoring force but also its configuration to increase the first angle during expansion adds a mechanical advantage that enhances performance under large loads, making the system universally effective across all load conditions.
2Reliability
If the elastic member is configured to increase the first angle during expansion, then the suspension effectiveness under small loads is improved, but the link hook rotation mechanism becomes more complex
Solution Approach 1:
The patent applies asymmetry in the positioning of the rotational axes and the configuration of the links. The first rotational axis and second rotational axis are positioned at different locations on the base, and similarly the third and fourth rotational axes are positioned differently on the seat platform. This asymmetric arrangement creates the geometric condition where the first angle naturally increases during elastic member expansion, providing enhanced suspension effectiveness under small loads without requiring complex active control mechanisms.
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
The system provides a comfortable ride by effectively utilizing tension to maintain suspension function even under small loads and preventing excessive sinking under large loads, eliminating the need for additional cushions and simplifying the design.
Implementation Method 1
absorb vibration of a machine body by means of elastic force of the tension spring
Data Source
AI summary
A seat suspension includes a base including a base hook and a seat platform provided with a seat. A first link couples a first rotational axis of the base and a third rotational axis of the seat platform and is configured to be rotatable about the first rotational axis and the third rotational axis. A second link couples a second rotational axis of the base and a fourth rotational axis of the seat platform and is configured to be rotatable about the second rotational axis and the fourth rotational axis. A link hook is provided on the second link. An elastic member is latched to the base hook and the link hook and is configured to pull the link hook toward the base hook. A first angle between a contracting direction of the elastic member and a rotation direction of the link hook increases as the elastic member expands.