Dual Hydraulic Motor Layout for Balanced Construction Machine Drive
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Solution Overview
Problem
Construction machines face issues with uneven load sharing in coupling portions due to phase differences in rotary actuators and speed reducers, leading to instability and uncontrollability in rotational forces.
Innovation Solution
A drive device comprising two fluid motors with a channel member that supplies pressure fluid to both motors through separated channels, ensuring balanced rotational forces by orienting the drive shafts parallel to each other and opposing them along the rotation axes, and using reduction units to decelerate rotation and transmit forces co-axially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If rotary actuators and speed reducers are mounted on both sides of the coupling portion in the rotation axis direction, then the rotational driving force can be transmitted to both sides, but a difference in load sharing occurs due to phase difference, resulting in uneven rotational forces
Solution Approach 1:
The pressure fluid supply channel is segmented into two separate supply channels that are spatially separated. Each supply channel independently supplies pressure fluid to one fluid motor, eliminating the phase difference that occurs in conventional single-channel systems. This segmentation of the supply path ensures that both fluid motors receive synchronized pressure fluid, achieving balanced load sharing while maintaining powerful rotational driving force transmission to both sides of the coupling portion.
2Power
If the drive shafts of the two fluid motors are oriented toward opposite sides along rotation axes, then the rotational driving force can be shared between both sides, but the structure becomes more complex
Solution Approach 1:
The channel member is designed to serve dual functions: it acts as both the supply channel for pressure fluid and as part of the casing structure for the fluid motors. By merging the supply channel function with the structural casing function, the patent reduces the number of separate components needed. This integration simplifies the overall structure while maintaining the drive shafts' opposite orientation configuration that enables balanced rotational driving force sharing between both sides.
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 configuration balances rotational driving forces between both sides, inhibiting load sharing differences and enhancing stability and efficiency in the operation of construction machine components.
Implementation Method 1
two fluid motors serving as drive sources for generating rotational forces... a motive power generating unit provided in the casing and configured to rotate the drive shaft with the pressure fluid
Implementation Method 2
The channel member includes two separated supply channels into which the supply channel on a common supply source side is separated
Implementation Method 3
two reduction units each including an input portion and an output shaft, the input portion being coupled to associated one of the two fluid motors, the output shaft being configured to decelerate rotation of the input portion and output the decelerated rotation
Data Source
Figure 1
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Figure 3
AI summary
The drive unit (1) according to the present invention includes two fluid motors (8A, 8B) serving as drive sources for generating rotational forces, and a channel member (9) having a supply channel (9c) for supplying a pressure fluid to the two fluid motors (8A, 8B). Each of the two fluid motors (8A, 8B) includes: a casing (81) having a supply port (91) and a discharge port (92) for the pressure fluid; a drive shaft (76a, 76b) rotatably supported to the casing (81); and a motive power generating unit (83) provided in the casing (81) and configured to rotate the drive shaft (76a, 76b) with the pressure fluid, the pressure fluid being supplied to the motive power generating unit (83) through the supply port (91) and discharged from the motive power generating unit (83) through the discharge port (92). The two fluid motors (8A, 8B) are arranged such that the respective drive shafts (76a, 76b) are disposed parallel to each other and oriented toward opposite sides along rotation axes (C1) of the drive shafts (76a, 76b). The supply channel (9c) supplies the pressure fluid to the supply ports (91) of the two fluid motors (8A, 8B). The channel member (9) includes two separated supply channels (9e) into which the supply channel (9c) on a common supply source side is separated at a separation portion (9a).