Vehicle Seat Pump Lever Bracket Spacing Mechanism
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Solution Overview
Problem
Conventional seat pumping devices for vehicles experience excessive friction and poor manipulation feeling due to the compression of the lever bracket and housing during the welding process of the clutch cam, leading to malfunctioning and inefficient operation.
Innovation Solution
A seat pumping device design that includes a housing with a slit hole and a clutch cam with protrusions, allowing the lever bracket to be spaced apart from the housing by a predetermined distance through a coupling mechanism with different diameter holes and tapered surfaces, reducing friction and improving the manipulation feeling of the lever handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lever bracket and housing are compressed together during welding of the clutch cam, then the components are securely assembled, but excessive friction occurs and manipulation feeling deteriorates
Solution Approach 1:
The coupling hole is divided into two segments with different diameters: a first coupling hole with a smaller diameter and a second coupling hole with a larger diameter. This segmentation allows the lever bracket to be positioned at a predetermined distance from the housing, preventing excessive compression while maintaining secure assembly through the tapered surface engagement.
2Volume of moving object
If the lever bracket is positioned close to the housing, then the structure is compact, but friction increases and operation becomes difficult
Solution Approach 1:
The coupling mechanism employs local quality variation through tapered surfaces and differently sized coupling holes. The tapered surface provides a localized engagement zone that maintains the lever bracket at an optimal distance from the housing, ensuring smooth operation while preserving overall device compactness.
3Manufacturing precision
If the coupling holes have different diameters, then the lever bracket spacing is controlled, but manufacturing complexity increases
Solution Approach 1:
The coupling mechanism utilizes parameter changes by varying the diameter of coupling holes (first coupling hole with smaller diameter, second coupling hole with larger diameter) and incorporating tapered surfaces. This approach achieves precise spacing control of the lever bracket from the housing while maintaining manufacturability through standard machining operations.
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 solution effectively reduces friction and enhances the manipulation feeling of the lever handle by maintaining a predetermined distance between the lever bracket and the housing, resulting in improved operational efficiency and user experience.
Implementation Method 1
the return spring 12 is compressed by the lever arm 2 of the lever bracket 10, and provides an elastic restoring force to the lever bracket 10
Implementation Method 2
The brake device 40 includes a brake drum 42 having a T-shaped protrusion 43 formed on an outer circumferential surface of the brake drum 42, and multiple brake rollers 44 arranged between the wedge portion 33 and the protrusion 43 in a circumferential direction of the brake device. Accordingly, the brake device 40 can block torque input in reverse
Data Source
AI summary
A seat pumping device for a vehicle is mounted to a vehicle seat frame at a lower end part thereof, and may include: a housing having inner space provided therein and a slit hole provided in an upper end surface thereof; a clutch cam rotatably received into the inner space of the housing and having protrusions provided thereon, the protrusions protruding toward an outside of the housing by passing through the slit hole of the upper end surface thereof; and a lever bracket arranged at the outside of the housing to face the upper end surface of the housing, and having an insertion portion into which each of the protrusions of the clutch cam is inserted, so that the lever bracket is coupled to the clutch cam by coupling of the protrusion and the insertion portion to each other, and is rotated with the clutch cam.