Planetary Gear Bearing Layout for Kitchen Motor Load Protection
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Solution Overview
Problem
Kitchen appliances with universal electric motors face reduced service life due to tilting moments from axial loads, which directly affect the motor and gear storage, particularly when tools are loaded with foodstuffs, leading to potential damage of plastic gear stages.
Innovation Solution
A kitchen appliance with a planetary gear drive system that incorporates a ball bearing to absorb axial and radial forces, distributing them to the transmission housing, thereby protecting the motor and eliminating the need for separate motor bearings, using a ball bearing with an inner and outer ring arrangement and guide grooves for force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a universal electric motor is used to power the kitchen appliance, then the appliance can achieve high speed and compact design, but the motor bearing is directly exposed to tilting moments from axial loads, reducing service life
Solution Approach 1:
The patent introduces a ball bearing as an intermediary component between the motor and the planetary gear. This ball bearing absorbs the tilting moments and axial loads, preventing them from being transmitted directly to the motor bearing. The ball bearing acts as a mediator that protects the motor while allowing the high-speed operation to continue.
2Ease of manufacture
If plastic gear stages are used in the planetary gear, then manufacturing cost is reduced, but the gears are vulnerable to damage from tilting moments and axial loads
Solution Approach 1:
The ball bearing serves as a protective intermediary that shields the plastic gear stages from harmful tilting moments. By absorbing these loads before they reach the plastic gears, the ball bearing enables the use of cost-effective plastic materials while preventing gear damage.
Solution Approach 2:
The ball bearing provides beforehand cushioning by being positioned to receive and absorb tilting moments before they can affect the plastic gear stages. This preventive measure protects the weaker plastic components from overload.
3Reliability
If additional motor bearings are added to protect against tilting moments, then motor service life is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the function of protecting against tilting moments into the existing ball bearing that is already part of the planetary gear structure. Instead of adding separate motor bearings, the design combines the load-absorbing function with the existing gear support structure, avoiding additional complexity.
Solution Approach 2:
The ball bearing in the planetary gear is given a dual function: it supports the planetary gear operation and simultaneously absorbs tilting moments to protect the motor. This multi-functionality eliminates the need for separate protective bearings.
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 absorbs and distributes tilting moments, enhancing the service life of the electric motor and planetary gear by transferring forces to the gearbox housing, reducing the risk of damage and allowing for cost-effective manufacturing without additional motor support.
Implementation Method 1
the planet carrier being arranged on a roller bearing in the transmission housing. According to the invention, the rolling bearing is a ball bearing
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a kitchen appliance (1), comprising a drive unit (2), wherein the drive unit (2) comprises a planetary gear (3), which comprises a sun gear (4), at least one planet wheel (5) disposed on a planet carrier (6), and a ring gear (7) disposed in a gear housing (8) of the planetary gear (3), wherein the planet carrier (6) drives an output shaft (17).