Vehicle Drive Unit Mount Bracket Layout for Lower Height and Weight
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Solution Overview
Problem
Existing vehicle driving devices require larger mount brackets when the coupling portion between the mount bracket and the vehicle body is located above the rotating electrical machine and power transmission mechanism, necessitating increased size to maintain strength.
Innovation Solution
The mount bracket is attached to a second case portion positioned above a first case portion, which houses the rotating electrical machine and power transmission mechanism, allowing for a reduction in the mount bracket's vertical dimension while maintaining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the mount bracket is designed to support the rotating electrical machine and power transmission mechanism when the coupling portion is located above them, then the strength is sufficient to reduce shaking, but the dimension of the mount bracket in the up-down direction increases
Solution Approach 1:
The patent repositions the coupling portion from above the rotating electrical machine to the side surface of the case, changing the spatial dimension of connection. This allows the mount bracket to achieve sufficient strength through lateral support rather than vertical extension, reducing the up-down dimension while maintaining anti-shaking performance
Solution Approach 2:
Instead of having the coupling portion above the rotating electrical machine as in conventional designs, the patent inverts the arrangement by positioning it on the side surface of the case. This inversion enables the mount bracket to be shorter in the up-down direction while still providing adequate support strength
2Stability of the object's composition
If the mount bracket is increased in size to ensure strength when coupling portion is above the rotating electrical machine, then the shaking of vehicle driving device is reduced, but the weight of the mount bracket increases
Solution Approach 1:
By moving the coupling portion to the side surface of the case, the patent changes the support geometry from vertical to lateral. This allows the mount bracket to achieve stability through a different spatial configuration, reducing the need for increased size and weight while maintaining anti-shaking effectiveness
Solution Approach 2:
The patent changes the spatial parameters of the mount bracket by repositioning the coupling portion. This parameter change enables the bracket to achieve the required stability with reduced dimensions and weight, as the lateral support configuration is more efficient than vertical extension
Data Source
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AI summary
A vehicle driving device (10) includes: a rotating electrical machine (MG); an output member configured to be drivingly coupled to a wheel (W1, W2); a power transmission mechanism (GT) configured to transmit a driving force between the rotating electrical machine and the output member; an inverter module (INV) configured to drive and control the rotating electrical machine; a power source module (PWR) including at least one of a voltage conversion circuit (31) electrically connected to an on-vehicle battery (B2) and configured to perform voltage conversion of the on-vehicle battery, a charging circuit (32) configured to charge the on-vehicle battery from an external power source (30), and a power supply circuit (32) configured to supply power from the on-vehicle battery to an outside; a first case portion (21) in which the rotating electrical machine and the power transmission mechanism are accommodated; a second case portion (22) in which at least one of the inverter module and the power source module are accommodated; and a mount bracket (72) configured to be coupled to a vehicle body (80) of a vehicle (8) in an on-vehicle state that is a state of being mounted on the vehicle. In the on-vehicle state, the second case portion is disposed on an upper side (Z1) with respect to the first case portion. The mount bracket is attached to the second case portion.