Multi-Backhoe Linkage Mechanism for Large-Angle Rotation
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Solution Overview
Problem
Existing linkage mechanisms for achieving large rotating motions in construction equipment and industrial robots face challenges such as high weight, friction, wear, and the need for complex gear transmissions, which limit their efficiency and durability.
Innovation Solution
A backhoe linkage mechanism comprising multiple closed kinematic chains that amplify the angle of rotation of an output link, allowing for a large range of motion with minimal moving mass and localized friction and wear in machine elements, eliminating the need for heavy gear transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gear transmission is used to achieve large rotation, then unlimited rotation is possible, but weight and cost increase significantly
Solution Approach 1:
The patent extracts the gear transmission component entirely from the system, replacing it with a direct linkage mechanism that achieves large rotation through geometric arrangement of links and joints rather than through gear ratios. This eliminates the heavy gear wheels while maintaining the ability to achieve unlimited rotation.
Solution Approach 2:
The patent substitutes the traditional gear-based mechanical transmission system with a linkage-based mechanical system. Instead of using toothed gears to multiply rotation, the invention uses a series of connected links and joints that transmit motion through geometric constraints, achieving the same functional result with significantly reduced weight.
2Adaptability or versatility
If gear transmission is used to achieve rotation amplification, then rotation ratio is achieved, but friction and wear increase
Solution Approach 1:
The patent removes the gear teeth and their associated friction surfaces from the system. The rotation amplification is achieved through the mechanical advantage of the linkage geometry rather than through tooth engagement, eliminating the scuffing motion and wear that plague gear systems.
Solution Approach 2:
The invention replaces the gear transmission mechanism with a linkage mechanism that uses pin joints and linkages instead of meshing teeth. This substitution eliminates the high-friction contact surfaces of gear teeth while maintaining the ability to achieve rotation amplification through mechanical advantage.
3Adaptability or versatility
If gear transmission components are used, then rotation is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts the complex gear train components (multiple gear wheels, shafts, and mounting structures) and replaces them with a simpler linkage system consisting of connected links and joints. This reduction in component count and structural complexity directly lowers manufacturing cost while maintaining rotation capability.
Solution Approach 2:
The invention substitutes the complex gear transmission system with a simpler linkage system. Instead of multiple gear wheels mounted on shafts with precise alignment requirements, the patent uses a series of connected links with pin joints, which are simpler to manufacture, assemble, and maintain.
4Force
If gear teeth are used for torque transmission, then torque is transferred, but surface wear requires complete gear replacement
Solution Approach 1:
The patent removes the gear teeth from the system, eliminating the wear problem entirely. Torque is transmitted through the linkage members in compression and tension rather than through tooth contact, allowing individual linkages to be replaced if needed without replacing an entire gear assembly.
Solution Approach 2:
The invention replaces the gear tooth contact mechanism with a linkage mechanism that transmits torque through axial forces in the linkages. This substitution changes the failure mode from surface wear requiring complete gear replacement to potential linkage wear that can be addressed by replacing individual linkages or pins.
Data Source
Figure 1~2b
Figure 3a~4a
Figure 4b~5
AI summary
A multi-backhoe linkage mechanism, operable for rotating an output link (10) around an output axis of rotation (A6) of an output joint (J6) at a base (B0), includes a first closed kinematic chain (L0), including the output link (10), a connecting link (14), and an input link (12). The output link (10) is connected via the output joint (J6) to the base (B0) and via a connecting joint (J10) to the connecting link (14). The connecting link (14) is connected via a bridging joint (J14) to the input link (12). The first closed kinematic chain (L0) additionally includes a base link (8) connected to the base (B0) and to the input link (12). One or more additional closed kinematic chains (La, Lb, Lc) are connected in a series after the first closed kinematic chain (L0). Each additional closed kinematic chain (La, Lb, Lc) is connected to the previous closed kinematic chain (L0, La, Lb) such that actuation of the additional closed kinematic chain (La, Lb, Lc) amplifies the angle of rotation of the output link (10) around the output axis of rotation (A6).