Vehicle Axle Drive Device with Merged Brake Planetary Transmission
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Solution Overview
Problem
Existing drive devices for vehicle axles require significant installation space due to complex arrangements of planetary gears and brakes, limiting functional expansion and driving dynamics.
Innovation Solution
A drive device with two planetary gears, an input Ravigneaux wheel set and an output simple planetary gear set, integrated with an axle differential, allowing for hybrid and torque distribution modes with reduced installation space and increased efficiency, using a combination of hybrid and torque distribution gears that eliminate power splitting for enhanced driving dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three planetary gears with two brakes are used to provide hybrid mode and torque distribution mode, then functional versatility is improved, but installation space requirement increases
Solution Approach 1:
The patent combines multiple brake functions into a single brake unit that can control both planetary gear sets. The single brake is designed to selectively immobilize either the first or second planetary gear set, thereby achieving both hybrid mode and torque distribution mode functionality without requiring separate brake mechanisms for each mode.
Solution Approach 2:
The single brake unit is designed with multi-functionality to perform multiple roles: it can control the first planetary gear set for hybrid mode operation, control the second planetary gear set for torque distribution mode operation, and potentially operate in combination modes. This universal component replaces what would traditionally require multiple specialized brakes.
2Ease of operation
If complex planetary gear arrangements with multiple brakes are used, then driving dynamics are improved, but device complexity increases
Solution Approach 1:
The patent merges the control functions of multiple brakes into a single brake mechanism. This single brake is designed to selectively engage with different planetary gear sets, thereby simplifying the overall device architecture while maintaining the capability to achieve complex driving dynamics through programmed engagement sequences.
Solution Approach 2:
The system employs dynamic control of the single brake to achieve different operational modes. By programmatically controlling when and how the single brake engages with different planetary gear sets, the system can dynamically switch between hybrid mode, torque distribution mode, and potential combination modes, thereby achieving versatile driving dynamics without static mechanical complexity.
Data Source
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AI summary
The invention relates to a drive device for a vehicle axle, in particular a rear axle (HA), of a two-track vehicle. The vehicle axle (HA) has an axle differential (3) which can be connected to a primary drive machine on the input side and to vehicle wheels (9) of the vehicle axle (HA) on the output side via flange shafts (5, 7) arranged on both sides. The vehicle axle (HA) is paired with an additional drive machine (26) and a shiftable superimposing transmission (25) that can be shifted into a torque distribution gear stage (TV) in which a drive torque generated by the additional drive machine (26) is generated, wherein a torque distribution to the two vehicle wheels (9) can be changed depending on the magnitude and the rotational direction of the drive torque, and into a hybrid mode in which the drive torque generated by the additional drive machine (26) can be coupled into the two flange shafts (5, 7) of the vehicle wheels (9) in a uniformly distributed manner via the axle differential (3). According to the invention, the superimposing transmission (25) has precisely two planetary transmissions (PG1, PG2), an input planetary transmission (PG1) of which is designed as a Ravigneaux gear set that can be drivingly connected to the additional drive machine (26) on the input side and an output planetary transmission (PG2) of which is designed as a simple planetary transmission gear set.