Frameless Motor Dynamic Balancer for Tire Balance Measurement
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Solution Overview
Problem
Existing dynamic balancers face challenges in accurately determining tire balance due to radial forces introduced by side-mounted motors and unbalanced suspension systems, which complicate force measurements and tire securing mechanisms.
Innovation Solution
A dynamic balancer utilizing a frameless motor drive to rotate the tire, coupled with a chucking assembly that securely grips the tire using a non-circular locking shaft and wedge jaw mechanism, and a spring-biased return cylinder for precise tire engagement and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a side-mounted motor is used to rotate the tire, then the tire can be rotated at high speed for balance measurement, but radial forces are introduced to the spindle assembly that adversely affect sensor measurements
Solution Approach 1:
The patent removes the side-mounted motor from the system and replaces it with a frameless motor integrated into the spindle assembly. This extraction of the harmful external motor eliminates the radial forces that were adversely affecting sensor measurements, while the frameless motor provides the necessary rotation capability without introducing measurement errors.
Solution Approach 2:
The frameless motor acts as an intermediary between the control system and the tire rotation mechanism. It is directly coupled to the spindle assembly, providing precise rotational control without introducing harmful radial forces. The motor's direct integration allows it to serve as a clean intermediary that drives rotation while maintaining measurement integrity.
2Ease of operation
If opposed suspension springs are used in the motor housing, then the motor can be supported, but the springs become unbalanced after minimal use and introduce forces into the spindle assembly that distort load cell measurements
Solution Approach 1:
The patent eliminates the opposed suspension springs from the system by using a frameless motor design that does not require such springs for support. This removal of the springs eliminates the source of unbalanced forces that were distorting load cell measurements, while the frameless motor structure provides inherent support without compromising measurement accuracy.
3Reliability
If ball bearings are used in the chuck locking mechanism, then the tire can be held in place during rotation, but the bearings are easily misaligned and the sleeves do not engage properly
Solution Approach 1:
The patent replaces the ball bearing-based chuck locking mechanism with a magnetic field-based system. Magnets are used to hold the tire bead securely during rotation, eliminating the mechanical alignment issues associated with ball bearings and sleeves. This substitution of magnetic fields for mechanical components simplifies the locking mechanism and improves reliability.
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 configuration minimizes extraneous forces on the spindle assembly, enhances the accuracy of force measurements, and ensures secure tire engagement, leading to improved detection of tire balance conditions.
Implementation Method 1
a frameless motor assembly connected to selected components of the spindle assembly
Implementation Method 2
a chucking assembly receiving a locking member to capture a tire therebetween
Implementation Method 3
a spring-biased return cylinder for precise tire engagement and release
Data Source
Figure 1
Figure 1A
Figure 2
AI summary
A dynamic balancer (20) includes an outer housing (24) and a spindle assembly (34) rotatably mounted to the outer housing (24). A frameless motor assembly (40) is connected to selected components of the spindle assembly (34). A chucking assembly (32) receives a locking member (30) to capture a tire therebetween. The chucking assembly (32) and the locking member (30) are captured in the spindle assembly (34) and rotated by the frameless motor assembly (40). A spring-biased return cylinder may be used with the dynamic balancer (20) to assist in capturing and releasing the locking member (30) with respect to the chucking assembly (32). An adjustable encoder assembly may be associated with the motor assembly to monitor a rotational position of the tire and/or spindle assembly.