Drive Transmission Device Gear Orientation Stabilization
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Solution Overview
Problem
Existing drive transmission devices in image forming apparatuses suffer from abnormal noise and vibration due to unstable gear orientation, increased component count, and high mounting costs, as the rotation sliding bosses are mounted separately, leading to precision issues and increased man-hours.
Innovation Solution
A drive transmission device with a motor mounting plate, a driving motor, a motor pinion gear, a transmission gear, and a compression spring that stabilizes the reduction gear's orientation, reducing noise and vibration by ensuring proper engagement between gears, and integrating rotation sliding bosses with a resin frame to reduce component count and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotation sliding bosses are mounted separately by caulk to a metallic motor mounting plate, then gear strength and abnormal noise restriction are improved, but the number of components increases and mounting operations require large numbers of man-hours
Solution Approach 1:
The rotation sliding bosses are integrally formed with the motor mounting plate as a single resin component, eliminating the need for separate mounting operations. This merging of previously separate parts (bosses and plate) into one integrated component reduces assembly steps and man-hours while maintaining the functional requirements for gear support and noise reduction through the resin material's inherent properties
Solution Approach 2:
The motor mounting plate is constructed from resin material that combines structural support functions with noise reduction properties. The resin material serves multiple functions simultaneously: providing the mounting plate structure, forming the rotation sliding bosses, and reducing abnormal noise through its material characteristics, thereby eliminating the need for separate metal plate and boss components
2Device complexity
If rotation sliding bosses are integrally formed at a resin housing side, then the number of components and mounting operations are reduced, but reduction gear and output shaft cannot be positioned with high precision with respect to each other
Solution Approach 1:
The resin motor mounting plate is pre-formed with precisely positioned rotation sliding bosses and positioning protrusions integrated into its structure before assembly. This preliminary formation of precise positioning features during resin molding ensures that when the reduction gear and motor are assembled, the output shaft and reduction gear are automatically positioned with high precision relative to each other, eliminating the need for subsequent precision adjustment operations
3Ease of manufacture
If clearance exists between inside diameters of gear bosses and rotation sliding bosses, then gear assembly is simplified, but gear orientations become unstable and adversely affect engagement
Solution Approach 1:
A positioning protrusion on the resin motor mounting plate acts as an intermediary element that fits into a corresponding positioning groove on the reduction gear. This intermediary positioning mechanism eliminates the harmful clearance between the gear boss and rotation sliding boss, stabilizing the gear orientation during engagement while maintaining ease of assembly through the simple protrusion-groove fitting structure
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 effectively prevents abnormal noise and vibration, reduces the number of components and man-hours required for assembly, and lowers costs by stabilizing gear orientation and integrating rotation sliding bosses with the resin frame, resulting in a silent and efficient operation.
Implementation Method 1
a compression spring disposed between the transmission gear and the motor mounting plate
Implementation Method 2
since the reduction gear is stably oriented by being urged in one direction by the compression spring
Data Source
AI summary
A drive transmission device includes a motor pinion gear provided at an output shaft of the driving motor and a-transmission gear engaging the motor pinion gear. In the drive transmission device, a sliding washer and a compression spring are disposed between the transmission-gear and the motor mounting plate. The sliding washer is pressed against a web of the transmission gear by the compression spring.