Transaxle Brake Relay Arm Preventing Link Interference
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Solution Overview
Problem
Conventional transaxles for zero-turn vehicles face interference issues between brake operation mechanisms and non-component members, such as drive belts, due to the placement of link members and brake arms, which can disrupt proper rotational direction and functionality.
Innovation Solution
Incorporating a relay arm mechanism that pivots outside the transaxle casing, parallel to the brake operation shaft, to convert the movement direction of link members and prevent interference with obstructive members, ensuring proper rotational alignment and reducing component count by utilizing existing trunnion shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the link member and brake arm are disposed on the proximal side of the transaxle casing, then the brake operation mechanism is compact and easy to operate, but non-component members (such as drive belts) may interfere with the link member or brake arm
Solution Approach 1:
A relay arm is introduced as an intermediary component between the link member and the brake arm. The relay arm pivots on a pivot shaft that is disposed on the distal side of the transaxle casing, while the relay arm itself extends to connect with the brake arm on the proximal side. This intermediary structure allows the brake operation mechanism to remain compact and accessible while preventing interference with non-component members such as drive belts.
2Object-affected harmful factors
If the brake arm is positioned on the distal side of the transaxle casing, then interference with non-component members is avoided, but the brake operation mechanism becomes more complex and harder to operate
Solution Approach 1:
The relay arm serves as a mediator that bridges the distal side pivot shaft and the proximal side brake arm position. By pivoting the relay arm on the distal side (avoiding interference zones) while extending it to connect the brake arm on the proximal side (maintaining operability), the system achieves both protection from interference and ease of operation.
3Object-affected harmful factors
If additional components (relay arm and pivot shaft) are added to prevent interference, then interference with non-component members is prevented, but the device complexity increases
Solution Approach 1:
The relay arm and pivot shaft are designed to serve multiple functions: they prevent interference with non-component members, maintain proper rotational direction for brake operation, and integrate with the existing transaxle structure. The pivot shaft is disposed on the distal side where it does not interfere with drive belts, while the relay arm connects to the brake arm on the proximal side, making the added components multi-functional rather than purely additive.
Data Source
AI summary
A transaxle comprises a transaxle casing, axle, brake, brake arm, first and second link members, and relay arm. The brake includes a brake operation shaft pivotally supported by the transaxle casing for shifting between brake activation and inactivation states. A starting end of the first link member is connected to a manipulator, and a terminal end of the second link member is connected to the brake arm. The relay arm is pivotally centered on a first pivotal axis outside of the transaxle casing, and includes a first arm portion extended from the first pivotal axis to a first end and a second arm portion extended from the first pivotal axis to a second end. A terminal end of the first link member is connected to the first arm portion, and a starting end of the second link member is connected to the second arm portion.