Powershift Transmission with Intermediate Gear Multiplication
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Solution Overview
Problem
Existing powershift transmissions for motor vehicles have a limited number of powershiftable gears, which restricts their versatility and efficiency, especially in applications requiring a high number of gear shifts without interrupting torque.
Innovation Solution
A multiple powershift intermediate transmission is introduced, which multiplies the number of powershiftable gears by using a synchromesh transmission group and an intermediate group with multiple clutches, allowing seamless switching between gear stages without interrupting torque, and can be operated manually or electrohydraulically, with the option of using a hydraulic pump driven by the motorized drive shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional powershift transmission is used, then the structure remains simple, but the number of powershiftable gears is limited
Solution Approach 1:
The transmission is divided into multiple independent groups: a split group with multiple powershift stage transmissions, a synchromesh transmission group with multiple gear stages, and an intermediate group. Each group can be switched independently, allowing the number of powershiftable gears to be multiplied (e.g., 4 stages in split group × 3 stages in synchromesh group = 12 powershiftable gears) without creating a single complex monolithic structure.
2Adaptability or versatility
If more gear stages are added to increase the number of powershiftable gears, then versatility improves, but the risk of tensile force interruption increases
Solution Approach 1:
The transmission design ensures continuous tensile force transmission through multiple overlapping clutch arrangements. Each gear stage has associated clutches that can be engaged/disengaged in sequence, and the intermediate group provides additional clutch combinations that maintain continuous power flow. This allows seamless switching between gear stages without interrupting torque transmission to the output shaft.
3Device complexity
If manual switching of clutches is used, then the structure remains simple, but the ease of operation decreases
Solution Approach 1:
A hydraulic actuation system is provided with a hydraulic pump (driven by the drive shaft) and hydraulic cylinders that can automatically engage and disengage the multiple clutches in the transmission groups. This electrohydraulic switching mechanism simplifies operator input while managing the complexity of coordinating multiple clutch operations across the split group, synchromesh group, and intermediate group.
Data Source
AI summary
A powershift transmission of a motor vehicle has a split group with a plurality of powershift stages. An input shaft can be rotatably driven by a drive shaft of a motorized drive and transmits rotational movement in a stepped-up manner to an output shaft of the split group corresponding to one of several powershiftable stage transmissions. The powershiftable stage transmissions can be rotatably driven in a stepped-up manner by the output shaft of the split group via an intermediate group located therebetween, and via an input shaft of a synchromesh transmission group having a plurality of gear stages. A vehicle axle transmission can be rotatably driven by the output shaft of the synchromesh transmission group. The intermediate group has a multiple powershift intermediate transmission, in which each switching position the input shaft of the synchromesh transmission group can be rotatably driven by means of an associated transmission.