Vehicle Door Actuator Spindle Nut Rotation Constraint
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing door opening and closing device for vehicles experiences inefficiencies in converting rotational movement of the threaded spindle into linear movement due to relative rotation of the spindle nut with respect to the guide tube, caused by separate components and processing variations.
Innovation Solution
A door opening and closing device that incorporates a spindle drive mechanism with a push rod fixed to the spindle nut and a guide tube featuring a guide groove to restrict relative rotation, ensuring the rotational movement is converted into relative movement of the spindle nut and push rod with respect to the guide tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spindle nut, spindle tube, and wiper are formed as separate bodies, then the ease of manufacture is improved, but the reliability of preventing relative rotation deteriorates
Solution Approach 1:
The spindle nut and wiper are integrated into a single unitary structure. The wiper is formed as an integral part of the spindle nut, eliminating the need for separate mounting operations and ensuring precise positional relationship between the wiper and the guide tube's axial slot, thereby preventing relative rotation while maintaining manufacturing efficiency.
Solution Approach 2:
The wiper is positioned within the axial slot of the guide tube, with the wiper's protruding end fitting into the slot to prevent relative rotation. This nested arrangement ensures that the wiper and guide tube work together as a coordinated system, maintaining reliable rotational constraint.
2Reliability
If the wiper protrudes through the axial slot to prevent relative rotation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The wiper and spindle nut are combined into a single component, reducing the total number of parts. This integration eliminates the need for separate mounting operations and ensures precise positional relationship, thereby preventing relative rotation while simplifying the overall device structure.
Solution Approach 2:
The spindle nut serves multiple functions: it converts rotational motion to linear motion through threading with the spindle, and it prevents relative rotation through the integrated wiper that engages with the guide tube's axial slot. This multi-functionality reduces the need for additional components.
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
Effectively prevents relative rotation of the spindle nut with respect to the guide tube, ensuring efficient conversion of rotational movement into linear movement, thereby improving the operational efficiency of the door opening and closing mechanism.
Implementation Method 1
a spindle nut (60) screwed with the spindle (50)
Data Source
AI summary
A door opening and closing device for vehicles of the present invention includes: a motor drive mechanism; a first housing that accommodates the motor drive mechanism; a spindle drive mechanism connected to the motor drive mechanism; and a second housing that is arranged coaxially with the first housing and relatively moves with respect to the first housing by the spindle drive mechanism. The spindle drive mechanism includes: a spindle connected to the motor drive mechanism; a spindle nut screwed with the spindle; a push rod fixed so as not to rotate relative to the spindle nut and provided with a protrusion on its outer periphery; and a guide tube in which a guide groove guiding the protrusion of the push rod in an axial direction is formed.