Vehicle Sliding Door Arm With Cycloidal Rail Motion
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Solution Overview
Problem
The existing sliding door devices for vehicles require excessive space for the door arm to penetrate into the side sill, necessitating an increased vehicle height due to a fixed sliding door arm structure.
Innovation Solution
A sliding door device utilizing a cycloidal curvilinear motion with a door arm that includes a lower slider and a lower arm plate, which performs cycloidal rotation and rectilinear movement along a rail system, reducing the need for the door arm to penetrate deeply into the side sill by using rollers and rails with varying heights and paths to facilitate smooth opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed sliding door arm structure is used, then the door can be opened and closed, but the space required for door arm penetration into the side sill becomes excessively large
Solution Approach 1:
The door arm structure is transformed from a fixed configuration to a dynamic one that changes its trajectory during operation. The lower arm plate performs cycloidal rotation combined with rectilinear movement, allowing the door arm to adapt its path and reduce penetration depth into the side sill while maintaining opening and closing functionality.
Solution Approach 2:
The door arm movement is extended from simple rectilinear sliding to a two-dimensional cycloidal curvilinear path. By adding the rotational dimension through the lower arm plate's cycloidal motion, the system achieves the same door opening function with reduced linear penetration space into the side sill.
2Ease of operation
If excessive space is allocated for door arm penetration, then the door operation is facilitated, but the vehicle floor height must be increased
Solution Approach 1:
The dynamic cycloidal motion of the lower arm plate allows the door arm to clear the side sill with minimal penetration depth. The combined rotational and rectilinear movement creates an optimized trajectory that reduces the vertical space requirement, thereby maintaining a lower vehicle floor height while ensuring smooth door operation.
Solution Approach 2:
The movement parameters of the door arm are changed from simple linear translation to cycloidal curvilinear motion. This parameter change in the motion trajectory allows the door arm to achieve the necessary clearance and operational range with reduced penetration depth, thus reducing the required vehicle floor height.
3Volume of moving object
If a cycloidal curvilinear motion mechanism is implemented, then the door arm penetration space is reduced, but the device complexity increases
Solution Approach 1:
The complex cycloidal motion is achieved by segmenting the door arm into multiple components: the door arm itself, the lower arm plate, and the lower slider. Each component performs a simpler motion (rotation or rectilinear movement), and their combination produces the desired cycloidal curvilinear trajectory, reducing overall system complexity while achieving the space reduction goal.
Solution Approach 2:
The lower arm plate acts as an intermediary component that translates the simple rectilinear movement of the lower slider into the complex cycloidal rotation required for space-efficient door arm penetration. This intermediary mechanism enables the conversion of simple to complex motion without requiring the entire system to be inherently complex.
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 solution allows for a flat vehicle body structure and reduces the vehicle height by minimizing the space required for door arm penetration, enhancing operational efficiency and aesthetics.
Implementation Method 1
a lower arm plate connecting the second end portion of the door arm and the lower slider and configured to perform a cycloidal rotation and a rectilinear movement when the lower slider moves along the side sill
Implementation Method 2
A plurality of first rollers may protrude from the lower arm plate and be spaced from one another at predetermined intervals, and the first rollers may be inserted into the first rail and move
Data Source
AI summary
A sliding door device for a vehicle includes a door configured to open or close a door opening portion formed in a vehicle body; a door arm including a first end portion rotatably connected to an end portion of the door, and a second end portion configured to be movable along a side sill of the vehicle body; a lower slider coupled to the second end portion of the door arm and configured to be rectilinearly movable along the side sill of the vehicle body; a lower arm plate connecting the second end portion of the door arm and the lower slider and configured to perform a cycloidal rotation and a rectilinear movement when the lower slider moves along the side sill; and a first rail providing a route through which the lower arm plate performs the cycloidal rotation and the rectilinear movement when the lower slider moves along the side sill.