Damper Valve Seat Geometry for Load-Responsive Braking Force
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Solution Overview
Problem
Existing damper devices lack good load responsiveness, as the valve body is difficult to enter a narrow groove, affecting the adjustment of damping forces based on the weight of items in the glove box.
Innovation Solution
A damper device with a valve seat having an inclined surface and a vent groove that allows the valve body to elastically deform along the surface, widening the contact area and preventing entry into the groove, thereby adjusting damping forces based on load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the groove width is made fine to adjust damping force, then damping force adjustment is possible, but the valve body becomes difficult to enter the groove, reducing load responsiveness
Solution Approach 1:
The invention changes the geometric parameters of the groove, specifically making the groove width larger than the valve body diameter, and introduces an inclined surface that guides the valve body into the groove. This parameter change allows the valve body to easily enter the groove while still enabling damping force adjustment through the vent hole, thereby improving load responsiveness without sacrificing damping control.
2Force
If the valve body enters the groove to narrow the orifice opening, then larger damping force is generated, but the fine groove width prevents easy entry, reducing responsiveness to load changes
Solution Approach 1:
The inclined surface acts as an intermediary that facilitates the entry of the valve body into the groove. By providing a gradual transition surface, it mediates between the valve body and the groove, enabling easy entry even with a relatively wide groove, thus ensuring reliable load responsiveness while maintaining the damping force generation mechanism.
Solution Approach 2:
The groove width is changed from a fine width to a width larger than the valve body diameter, and an inclined surface is introduced with a specific angle. These parameter changes enable the valve body to easily enter the groove in response to load changes, improving reliability of load responsiveness while still allowing damping force adjustment when the valve body is in the groove.
3Force
If the groove has a fine width for precise damping control, then damping force can be adjusted, but the valve body contact area is reduced, making entry difficult
Solution Approach 1:
The groove width parameter is changed to be larger than the valve body diameter, and an inclined surface is introduced with a extended length. This increases the valve body contact area with the groove, facilitating easy entry while maintaining the ability to adjust damping force through the vent hole when the valve body is positioned in the groove.
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 damper device improves load responsiveness by adjusting damping forces appropriately based on the weight of items, ensuring stable braking forces at the right timing.
Implementation Method 1
an elastically deformable valve body is provided at the other end portion of the cylinder and abuts against the valve seat before and when the piston moves in a damper braking direction, and at least a part of the valve body separates from the valve seat when the piston moves in a return direction opposite to the damper braking direction
Data Source
AI summary
A damper device includes: a cylinder having a vent hole and a valve seat; and a piston. An elastically deformable valve body abuts against the valve seat before and when the piston moves in a damper braking direction. The valve seat is formed with a vent groove. A protrusion amount of an inclined surface gradually decreases from a side of an outer periphery of the valve seat toward the vent hole. The vent groove includes a first groove that extends from an outer periphery of the inclined surface toward the vent hole such that a depth thereof with respect to the inclined surface gradually decreases. When the piston moves in the damper braking direction, the valve body comes into contact with the inclined surface and is elastically deformed, and a contact area with the inclined surface widens.