Parking Brake Grip Assembly for Sequential Pedal Locking
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Solution Overview
Problem
Conventional work vehicles require simultaneous operation of the brake pedal and parking brake lever, which is complex and cumbersome.
Innovation Solution
A parking brake system featuring a brake pedal with a notch structure, a grip assembly with a rod, collar, plain washer, and compression spring, allowing the grip assembly to be locked in place before stepping on the brake pedal, eliminating the need for simultaneous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conventional parking brake system is used, then the brake can be applied, but the operator must simultaneously operate the brake pedal and parking brake lever, making the operation complicated
Solution Approach 1:
The grip assembly is pulled out in advance to prepare the parking brake mechanism before applying the brake. This preliminary action positions the claw in readiness to engage with the notch, allowing the brake pedal to be stepped on subsequently without requiring simultaneous operations. The sequence is: pull grip assembly out → claw moves to engage with notch → step on brake pedal
Solution Approach 2:
The parking brake operation is divided into distinct sequential steps: first pulling the grip assembly to engage the claw with the notch, then stepping on the brake pedal. This segmentation of the operation into separate phases eliminates the complexity of simultaneous operations while maintaining effective brake application
2Reliability
If the grip assembly is pulled out to engage the claw with the notch, then the parking brake is locked, but the through-hole must have specific dimensional constraints to accommodate the collar and rod
Solution Approach 1:
The through-hole is designed with different regional characteristics: a first region with sufficient width for the collar to slide freely, and a second region with constrained dimensions (width shorter than collar outer diameter but longer than rod outer diameter) to lock the grip assembly in place. This local differentiation of hole geometry provides both reliable locking and smooth operation without requiring complex additional components
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
Simplifies the operation of the parking brake, improving ease of use and reducing the risk of accidental unlocking by allowing sequential operation, enhancing overall operability.
Implementation Method 1
a compression spring that interconnects the plain washer and the pin and that covers the outer periphery of the rod
Data Source
AI summary
In a work vehicle, a through-hole in a stay includes first and second regions. When a grip is pulled in an unlocked state in which a collar is located inside the first region and a grip assembly is not locked inside the through-hole, a state is transitioned into a locked state in which a compression spring is compressed by a pin and a plain washer, a brake lever rotates, a claw moves toward a notch, and a rod is located inside the second region and the grip assembly is locked inside the through-hole. When a brake pedal is stepped on in this locked state, the claw and the notch engage with each other, and the brake pedal is locked.