Segmented Vehicle Seat Hinge Shaft Isolates Welding Heat
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Solution Overview
Problem
The viscous damping performance of oil dampers in vehicle seat hinge mechanisms decreases due to welding heat generated when the rotating shaft is welded to the frame, affecting the assembly of heat-sensitive components.
Innovation Solution
The rotating shaft is divided into a first shaft portion and a second shaft portion, allowing the heat-affected member to be assembled without being affected by welding heat, with the spiral spring and heat-affected member accommodated between inner side plate portions for a compact arrangement and high structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rotating shaft is welded to the frame, then the structural strength is improved, but the viscous damping performance of the oil damper deteriorates due to welding heat
Solution Approach 1:
The rotating shaft is divided into a first shaft portion and a second shaft portion. The first shaft portion is welded to the frame to provide structural strength, while the second shaft portion accommodates the oil damper without being subjected to welding heat, thereby preserving viscous damping performance.
Solution Approach 2:
The oil damper is extracted from the welded region and positioned in the second shaft portion, which is not subjected to welding heat. This separation allows the welding operation to proceed without compromising the oil damper's viscous damping performance.
2Ease of manufacture
If the heat affected member is assembled after welding, then the assembly process is simplified, but the viscous damping performance deteriorates due to heat exposure
Solution Approach 1:
The shaft is segmented into welded and non-welded portions, allowing the oil damper to be assembled into the non-welded second shaft portion after the welding operation is completed on the first shaft portion. This maintains manufacturing simplicity while protecting the oil damper from heat damage.
Solution Approach 2:
The welding of the first shaft portion to the frame is performed as a preliminary action before assembling the oil damper into the second shaft portion. This sequence ensures that the welding heat does not affect the oil damper while maintaining an efficient manufacturing process.
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 configuration prevents the degradation of viscous damping performance by isolating the heat-affected member from welding heat and ensures a strong, compact assembly that maintains the vehicle seat's rotatable functionality.
Implementation Method 1
a spiral spring which is passed through the rotating shaft and applies a rotational urging force to the movable portion
Implementation Method 2
a rotating shaft which is passed through the movable portion and the base portion in a horizontal direction and is welded to one of the movable portion and the base portion
Implementation Method 3
a rotary type oil damper which restrains a rotation speed of the flipping
Data Source
AI summary
A vehicle seat hinge mechanism includes:a base portion that is fixed to a vehicle body;a movable portion that is fixed to a vehicle seat;a rotating shaft that is passed through the movable portion and the base portion and is welded to one of the movable portion and the base portion;a spiral spring that is passed through the rotating shaft and applies a rotational urging force to the movable portion; anda heat affected member that is passed through the rotating shaft and arranged with the spiral spring,wherein the rotating shaft is divided into a first shaft portion and a second shaft portion, andthe first shaft portion includes an assembling portion that is capable of setting the heat affected member such that the heat affected member is passed from the one side.