Two-Part Bearing Bridge Layout for Hydromechanical Transmissions
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Solution Overview
Problem
Conventional hydromechanical transmissions in agricultural machines, such as tractors, face challenges with weight, installation space, and design flexibility due to the solid design of bearing bridges, which restrict the arrangement and design of other transmission components.
Innovation Solution
The hydromechanical transmission is designed with a two-part bearing bridge, where the first part includes channels for the adjusting device to change the hydrostatic units' delivery and displacement volume, and the second part connects the hydrostatic units for drive power transmission, reducing weight and complexity, allowing for more flexible component arrangement and simplified assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robust bearing bridge is used to support hydrostatic units and provide fluid circuit functions, then structural strength and reliability are improved, but weight increases and installation space requirements increase
Solution Approach 1:
The bearing bridge is divided into two separate bearing bridge elements: a first bearing bridge element that supports the pump hydrostatic unit and a second bearing bridge element that supports the motor hydrostatic unit. This segmentation allows each element to be optimized independently, reducing the overall weight while maintaining the required structural strength for supporting the hydrostatic units and withstanding hydraulic pressures.
2Reliability
If a robust bearing bridge is used to support hydrostatic units and provide fluid circuit functions, then structural strength and reliability are improved, but installation space requirements increase
Solution Approach 1:
The bearing bridge is divided into two separate bearing bridge elements: a first bearing bridge element that supports the pump hydrostatic unit and a second bearing bridge element that supports the motor hydrostatic unit. This segmentation allows each element to be optimized independently, reducing the overall installation space requirements while maintaining the required structural strength for supporting the hydrostatic units and withstanding hydraulic pressures.
3Reliability
If a robust bearing bridge is used to support hydrostatic units and provide fluid circuit functions, then structural strength is improved, but design flexibility and ease of manufacturing are worsened
Solution Approach 1:
The bearing bridge is divided into two separate bearing bridge elements: a first bearing bridge element that supports the pump hydrostatic unit and a second bearing bridge element that supports the motor hydrostatic unit. This segmentation allows each element to be manufactured independently using different manufacturing processes optimized for their specific requirements, then assembled together, thereby improving ease of manufacture and design flexibility while maintaining structural strength.
4Reliability
If a robust bearing bridge is used to support hydrostatic units and provide fluid circuit functions, then structural strength is improved, but accessibility for maintenance is worsened
Solution Approach 1:
The bearing bridge is divided into two separate bearing bridge elements: a first bearing bridge element that supports the pump hydrostatic unit and a second bearing bridge element that supports the motor hydrostatic unit. This segmentation improves accessibility for maintenance by allowing the pump and motor units to be accessed and serviced independently, reducing the need to disassemble the entire bearing bridge structure while maintaining structural strength.
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 reduces weight, minimizes installation space requirements, enhances design flexibility, and improves accessibility for maintenance, leading to a more efficient and durable hydromechanical transmission system.
Implementation Method 1
The first bearing bridge element (22.1) comprises channels or bores (31) which are hydraulically connected to an actuating device (23) of the hydrostatic transmission (4) for changing the delivery and/or absorption volume of the hydrostatic units (13, 14)
Implementation Method 2
The second bearing bridge element (22.2) comprises channels (32) which hydraulically connect the hydrostatic units (13, 14) to one another for transmitting the drive power
Implementation Method 3
The hydrostatic transmission (4) comprises a hydrostatic unit (13) acting as a pump and a hydrostatic unit (14) acting as a motor, which are hydraulically connected to one another to transmit drive power
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
The present invention relates to a hydromechanical transmission (2) comprising a mechanical transmission (3) and a continuously variable hydrostatic transmission (4) that interacts with the mechanical transmission (3), wherein the mechanical transmission (3) and the hydrostatic transmission (4) are housed in a transmission housing of the hydromechanical transmission (2), wherein the hydrostatic transmission (4) comprises a hydrostatic unit (13; 14) acting as a pump and a hydrostatic unit (14; 13) acting as a motor, which are hydraulically connected to each other for the transmission of drive power, and wherein the hydrostatic transmission (4) comprises a bearing bridge (22) in which the hydrostatic units (13, 14) are rotatably mounted. The hydromechanical transmission (2) is characterized in that the bearing bridge (22) is divided into two parts, a first bearing bridge element (22.1) and a second bearing bridge element (22.2).2) comprising, the first bearing bridge element (22.1) includes channels (31) which are hydraulically connected to an actuating device (23) of the hydrostatic transmission (4) for changing a delivery and/or swallowing volume of the hydrostatic units (13, 14) and the second bearing bridge element (22.2) includes channels (32) which hydraulically connect the hydrostatic units (13, 14) to each other for the transmission of the drive power.