Band Brake Actuator Layout for Compact Stepped Transmissions
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Solution Overview
Problem
There is a need to reduce the size of power transmission devices equipped with stepped transmission mechanisms that utilize a band brake, as existing designs are bulky and inefficient in space utilization.
Innovation Solution
The power transmission device incorporates a band brake and an actuator positioned adjacent to the outer circumference wall and side wall of the transmission mechanism, allowing for a compact design without increasing the device's size by utilizing the available space between these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a band brake is used in a stepped transmission mechanism, then the transmission can switch between low gear and high gear, but the device size increases
Solution Approach 1:
The actuator is positioned in the radial direction adjacent to the outer circumference wall, utilizing three-dimensional space arrangement to accommodate the band brake mechanism without increasing the overall axial length of the transmission device, thus resolving the contradiction between gear switching capability and device size
2Volume of moving object
If the actuator is positioned adjacent to the outer circumference wall and side wall, then the device size is minimized, but the available space for other components is reduced
Solution Approach 1:
The band brake mechanism is nested within the space formed by the outer circumference wall and side wall, with the actuator positioned in the radial direction to utilize otherwise wasted space, allowing compact arrangement without compromising the gear switching function
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 enables a more compact power transmission device with the band brake and actuator arrangement, maintaining performance while minimizing the device's size in both rotational and radial directions.
Implementation Method 1
a band brake (49), and an actuator (ACT) that drives the band brake (49)
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
A power transmission device (1) has: a motor (2); a transmission mechanism (3) connected downstream of the motor (2); a counter gear (5) disposed downstream of the transmission mechanism (3); and a body case (9) accommodating the motor (2), the transmission mechanism (3) and the counter gear (5). The transmission mechanism (3) has a band brake (49) and an actuator (ACT) for driving the band brake (49). The body case (9) has an outer peripheral wall (147) surrounding a radial outer periphery of the transmission mechanism (3), and a side wall (143) connected to the outer peripheral wall (147) and extending radially outward from the outer peripheral wall (147). The actuator (ACT) is adjacent to the outer peripheral wall (147) and is adjacent to the side wall (143).