Compact Gear Motor with Rotor-Integrated Planetary Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing geared motors in the automotive industry face challenges in achieving a reduced size while maintaining sufficient output torque, as the implementation of reduction gears often increases the motor's size and complexity.
Innovation Solution
A geared motor design incorporating a brushless motor with a planetary reduction gear integrated into the motor, where the reduction gear is housed within the rotor and aligned with the motor's axis, utilizing a single centering axis for rotational guidance and reducing wear, and made partially of plastic materials to minimize size and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a reduction gear is connected to the output of an electric motor, then the output torque is increased and the speed is reduced, but the size of the assembly significantly increases
Solution Approach 1:
The planetary reduction gear is integrated within the rotor structure of the electric motor, merging two separate components (motor and reducer) into a single unified assembly. This integration eliminates the need for separate mounting and reduces the overall volume of the geared motor while maintaining the torque multiplication function.
Solution Approach 2:
The reduction gear elements (sun gear, planet gears, ring gear) are nested within the rotor structure, with the sun gear positioned at the center and planet gears orbiting around it. This nested arrangement maximizes space utilization and minimizes the external dimensions of the geared motor.
2Force
If a planetary reduction gear is implemented, then the output torque is increased, but the complexity of the device increases
Solution Approach 1:
The rotor structure serves multiple functions: it acts as both the rotating component of the electric motor and as the housing for the planetary reduction gear. The planet carrier is integrated into the rotor structure, allowing it to perform both rotational and carrier functions simultaneously, thereby reducing overall device complexity.
3Weight of moving object
If reducer elements are made of plastic material, then the weight is reduced and manufacturing is simplified, but the durability and load capacity may be compromised
Solution Approach 1:
The reduction gear utilizes composite material construction, with plastic gears integrated into a metal rotor structure. This combination allows the lightweight plastic components to reduce overall weight while the metal structure provides the necessary strength and durability to handle operational loads.
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 design achieves a compact size, reduced wear, and increased efficiency by integrating the reduction gear within the rotor, allowing for a smaller footprint while maintaining sufficient torque and rotational speed, suitable for applications in motor vehicles and fluid management systems.
Implementation Method 1
a brushless electric motor, a planetary gearbox and an output shaft integral in rotation with the planetary gearbox, said electric motor comprising a stator, a rotor disposed in the stator
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
The invention relates to a gear motor comprising a brushless electric motor, a planetary reduction gear (R), and an output shaft (A) rotationally connected to the planetary reduction gear (R), said electric motor (M) comprising a stator (8) and a rotor (10) disposed inside the stator (8). According to the invention, the rotor (10) can be rotated about a longitudinal axis (X) by the rotor (10). The reduction gear (R) is housed at least partially inside the rotor (10) and comprises at least one first sun gear (24), at least one first planet gear (27) engaging with the first sun gear (24), and an outer ring gear (34) disposed inside the rotor (10) and engaged by the first planet gear (27). The first sun gear (24) and the first planet gear (27) are driven in rotation by the rotor (10). In addition, the gear motor comprises a centring spindle (38) extending along the longitudinal axis (X) and passing through the stator (8) and the rotor (10), and guiding the rotation of the rotor (10), the first sun gear (24) and the first planet gear (27), and the output shaft (A).