Torque Transmission System for Mobile Crane Power Distribution
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Solution Overview
Problem
Current mobile cranes face performance losses and leakage issues due to hydraulic energy transmission systems, which are inefficient and non-compliant with stringent axle load and emission regulations.
Innovation Solution
A drive motor powers both the undercarriage and superstructure through a torque transmission system, eliminating the need for a hydraulic rotary union and allowing for efficient power distribution between the two, using a drive motor on the undercarriage and a bevel gear or gear unit for torque conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic energy transmission system is used to power the superstructure from the undercarriage, then the drive motor can provide power for both the undercarriage and superstructure, but performance losses occur during energy transmission and leakage problems arise
Solution Approach 1:
The patent replaces the hydraulic energy transmission system with a direct mechanical torque transmission system. A torque transmission device is arranged between the drive motor and the superstructure, eliminating the hydraulic transmission path that caused energy losses and leakage problems while maintaining the capability to power both undercarriage and superstructure from a single drive motor.
Solution Approach 2:
The invention extracts and removes the hydraulic transmission components from the power transmission path. By eliminating the hydraulic system entirely and using direct mechanical coupling through the torque transmission device, the source of energy losses and leakage is removed while the dual power distribution function is preserved.
2Adaptability or versatility
If a hydraulic rotary union is used to transmit torque between undercarriage and superstructure, then power can be transmitted between rotating and stationary parts, but leakage losses and reliability issues occur
Solution Approach 1:
The patent substitutes the hydraulic rotary union with a purely mechanical torque transmission device. This device includes a drive shaft connected to the drive motor and a torque converter that transmits torque mechanically without requiring hydraulic seals or rotary unions, thereby eliminating leakage risks and improving reliability while maintaining torque transmission capability.
3Power
If multiple diesel engines are used to power both undercarriage and superstructure, then sufficient power is available, but emission regulations and axle load limitations are violated
Solution Approach 1:
The patent merges the power sources by using a single drive motor on the undercarriage to power both the undercarriage and the superstructure. The torque transmission device enables this single motor to distribute power to both systems, eliminating the need for multiple diesel engines and thereby reducing emissions while maintaining sufficient total power output.
Solution Approach 2:
The drive motor on the undercarriage is designed with multi-functionality to serve dual purposes: powering the undercarriage movement and powering the superstructure operations. The torque transmission device enables this universal power source to adaptively distribute power to different systems based on operational requirements, replacing multiple specialized engines with one versatile motor.
4Object-generated harmful factors
If a single drive motor is used to power both undercarriage and superstructure, then emission regulations are met, but torque transmission between undercarriage and superstructure is required
Solution Approach 1:
The patent introduces a torque transmission device as an intermediary component between the drive motor and the superstructure. This device includes a drive shaft and torque converter that efficiently transmit torque from the undercarriage-mounted motor to the superstructure, enabling single-motor operation and emission compliance without creating excessive system complexity.
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 solution enhances the reliability and energy efficiency of mobile cranes while adhering to axle load and emission regulations, reducing performance losses and leakage issues.
Implementation Method 1
A bevel gear into which a torque is introduced on the motor side and from which a torque is discharged on the rotary bearing side is particularly preferred here
Data Source
AI summary
The machine has a drive device (3) with a drive motor (4) arranged on an undercarriage (1) to deliver power to a distribution gearbox (9) over a non-designated transmission and a drive shaft. The drive device comprises a torque transmission unit (5) formed between upper and lower carriages to transmit the delivered power in the form of torque between the upper and lower carriages by the drive motor. The torque transmission unit comprises a shaft extending between the upper and lower carriages and includes an angular gear box (8).