Vehicle Window Shade Rack and Bevel Gear Transmission
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Solution Overview
Problem
Existing window shade devices for vehicles face layout constraints and unreliable operation due to the requirement for aligned winding shafts and the risk of the tension spring being caught, leading to potential issues with sheet drawing reliability.
Innovation Solution
A window shade device with a guide and support mechanism featuring a rack member and intermediate transmission mechanism, including bevel gears and a spur gear, allowing for flexible layout and reliable operation by transmitting rotation forces along a guide path member, enabling the second window shade to be drawn reliably without alignment constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the other winding shaft and threaded spindle are disposed in the same straight line, then the sheet can be drawn reliably, but the layout flexibility is severely constrained
Solution Approach 1:
The patent introduces a rack member as an intermediary component between the threaded spindle and the second winding shaft. The rack member translates the linear motion from the threaded spindle into rotational motion of the second winding shaft, eliminating the need for direct alignment between the shafts and spindles while ensuring reliable sheet drawing operation.
2Ease of operation
If the tension spring is used to draw the sheet, then the sheet can be drawn automatically, but the operation becomes unreliable when the spring portion is caught
Solution Approach 1:
The patent replaces the tension spring mechanism with a rack and pinion gear system. The rack member engages with the bevel gear to convert rotational motion into linear motion for drawing the sheet, eliminating the reliability issues associated with tension springs being caught while maintaining automatic operation.
3Device complexity
If the first winding shaft and rack member are directly connected, then the structure is simple, but the layout is constrained by alignment requirements
Solution Approach 1:
The patent uses bevel gears to transmit motion between intersecting axes, allowing the first winding shaft and rack member to be positioned in different spatial orientations. This enables flexible layout arrangements while maintaining a relatively simple transmission structure through three-dimensional gear engagement.
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 provides flexibility in layout and ensures reliable operation by transmitting rotation forces through bevel gears and a spur gear, preventing the rack member from being caught and allowing for easy adjustment of the moving directions of the windup shaft and rack member, thus enhancing the reliability of the sheet drawing mechanism.
Implementation Method 1
an intermediate transmission mechanism including a first bevel gear connected to the windup shaft member of the first windup device to rotate in association therewith and a second bevel gear disposed to mesh with the first bevel gear
Implementation Method 2
a rack member connected with the movable member, disposed to be movable along the guide path member, and moving the movable member along the guide path member
Data Source
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AI summary
A window shade device for vehicles covers a first window and a second window provided adjacent to each other to be shielded and opened. The window shade device for vehicles includes: a guide and support mechanism including a guide rail disposed along a drawing/housing direction of the second window shade and a movable member movable along the guide rail; a rack member connected with the movable member and configured to move along the guide rail; and an intermediate transmission mechanism including a first bevel gear and a second bevel gear and transmitting the rotation of a windup shaft member of the first windup device as a force for moving the rack member along the guide rail, the first bevel gear being connected to the windup shaft member so as to rotate in association therewith, the second bevel gear being disposed to mesh with the first bevel gear.