Lead Screw Motor Coupling Using Heat-Sealed Elastic Pin
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Solution Overview
Problem
The existing screw joint coupling structure for vehicle head lamp adjustment devices is inefficient due to a 2-step assembly process involving heat sealing and spring pin press-fitting, leading to potential misalignment and decreased operation efficiency, especially under repetitive shock loads.
Innovation Solution
A motor with a lead screw and ball-shaped joint member using a tube-shaped elastic pin for secure coupling, where the coupling member is inserted through communicating first and second coupling holes and sealed using heat and pressure to prevent disengagement, simplifying the assembly and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball-shaped joint member is coupled to a lead screw using a spring pin with heat sealing and press-fitting, then the coupling is secured, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent combines the heat sealing process and spring pin press-fitting process into a single integrated operation. The spring pin is inserted through aligned holes in the lead screw and ball-shaped joint member, then heat sealing is applied to secure the coupling in one continuous step, eliminating the need for separate assembly operations while maintaining coupling reliability
Solution Approach 2:
The coupling structure is divided into distinct components (lead screw, ball-shaped joint member, spring pin, and coupling holes) that can be independently manufactured and then assembled through a simplified process. The first and second coupling holes are positioned to align with the spring pin, allowing for easy insertion and securing
2Reliability
If a spring pin is press-fitted into coupling holes, then the joint member is secured, but misalignment and operational inefficiency occur under repetitive shock loads
Solution Approach 1:
The spring pin is designed with elastic properties to absorb and cushion repetitive shock loads before they can cause misalignment or damage to the coupling. The elastic deformation of the spring pin under load prevents rigid failure and maintains coupling integrity during dynamic operation
Solution Approach 2:
The patent changes the physical parameters of the coupling system by using an elastic spring pin instead of a rigid fastener, and by positioning multiple coupling holes to distribute loads. This allows the coupling to accommodate dynamic loads while maintaining operational precision
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 ensures accurate reciprocal feeding of the lead screw and improves assembly efficiency by preventing disengagement even under shock loads, thereby enhancing the productivity and reliability of the head lamp direction adjustment system.
Implementation Method 1
a coupling member (130) inserted into the first and second coupling holes (111, 121) to connect the joint member (120) to the lead screw (110), wherein a distal end of the coupling member (130) is heat-sealed to close the second coupling hole (121)
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed is a motor having a lead screw, the motor including a motor body (10), a lead screw (110) connected to an output axis of the motor body (10) to reciprocally move to a horizontal direction, a ball-shaped joint member (120) connected to a distal end of the lead screw (110), and a coupling member (130) coupling the lead screw (110) to the ball-shaped joint member (120), whereby the coupling member (130) is prevented from being disengaged by heat-sealing a surface insertedly coupled by the coupling member (130) of the joint member (120).