Gearshift Sleeve and Clutch Pack for Load-Shiftable Transmission
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Solution Overview
Problem
Existing transmissions for motor vehicles struggle to be both load-shiftable and energy efficient, as frictional clutches require constant high pressing forces for torque transmission, while interlocking clutches are not load-shiftable.
Innovation Solution
A transmission design featuring a hydraulically or electrically operable gearshift sleeve, a clutch pack, and ramp elements that allow the gearshift sleeve to move from an initial position to a first position for axial force transfer and then to a second position for interlocking coupling, reducing the need for large pressing forces by using a clutch pack with an open and closed position for efficient torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frictional clutches are used for torque transmission, then load-shiftable capability is improved, but energy consumption increases due to constant high pressing forces
Solution Approach 1:
The transmission system dynamically switches between two operational modes: using the clutch pack (frictional clutch) during shifting operations to enable load-shiftable capability, and using the interlocking claw clutch for normal torque transmission to minimize energy consumption. This dynamic mode switching resolves the contradiction by applying the appropriate mechanism based on operational requirements.
Solution Approach 2:
The transmission is segmented into two distinct torque transmission paths: a frictional clutch path (clutch pack with multiple disks) for load-shiftable operations, and an interlocking clutch path (claw clutch) for energy-efficient torque transmission. This segmentation allows each subsystem to optimize for its specific function, resolving the energy consumption issue while maintaining load-shiftable capability.
2Use of energy by moving object
If interlocking clutches are used for torque transmission, then energy efficiency is improved, but load-shiftable capability is lost
Solution Approach 1:
The transmission merges two previously separate clutch concepts (frictional clutch and interlocking clutch) into a single integrated system. The clutch pack and claw clutch are combined such that the clutch pack handles synchronization during shifting, while the claw clutch provides the final interlocking connection. This merging allows the system to achieve both energy efficiency and load-shiftable capability simultaneously.
Solution Approach 2:
The clutch pack performs preliminary action by synchronizing the rotational speeds of the input and output shafts before the final interlocking engagement. This preliminary speed equalization enables the subsequent claw clutch engagement to occur under load conditions, thereby achieving load-shiftable capability while maintaining energy efficiency during normal operation.
3Adaptability or versatility
If frictional clutches are used for synchronization, then load-shiftable capability is achieved, but large pressing forces are required
Solution Approach 1:
The clutch pack applies partial frictional action only during the shifting process to achieve synchronization, rather than requiring continuous high pressing forces. Once synchronization is achieved and the claw clutch engages, the pressing forces on the clutch pack can be reduced or eliminated, as the interlocking mechanism takes over for torque transmission.
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 enables load-shiftable and energy-efficient torque transmission by synchronizing rotary speeds under load without requiring large pressing forces, combining the advantages of multi-plate and claw clutches for efficient torque handling.
Implementation Method 1
the gearshift sleeve transfers an axial force by means of the first ramp element and the second ramp element to the clutch pack for synchronization of the disks
Implementation Method 2
the disks can be adapted under load... in that the rotary speed of the input shaft and the rotary speed of the output shaft can be equalized by an axial force under load
Implementation Method 3
the gearshift sleeve claw is connected to the output claw interlockingly in the direction of rotation and thus the input shaft and the output shaft are interlockingly coupled
Data Source
AI summary
A transmission for a motor vehicle is provided. The transmission has a hydraulically or electrically operable gearshift sleeve, a clutch pack, an input shaft, and an output shaft, a gearshift sleeve, a gearshift sleeve claw, and an opposing output claw associated with the output shaft. The gearshift sleeve can be moved from an initial position into a first position, in which the gearshift sleeve transfers an axial force by way of the first ramp element and the second ramp element to the clutch pack for synchronization of the disks, and into a second position, in which the gearshift sleeve claw is connected to the output claw interlockingly in the direction of rotation and thus the input shaft and the output shaft are interlockingly coupled. A method for shifting such a transmission is also provided.