Straddle-Type Vehicle Braking Apparatus with Segmented Hydraulic Mechanisms
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Solution Overview
Problem
Conventional straddle-type vehicle braking systems experience poor operation feeling due to high hydraulic pressure in the front wheel braking mechanism when the rear wheel braking mechanism is activated, making it difficult to strengthen the front wheel braking force.
Innovation Solution
The braking apparatus is designed with a first braking mechanism actuated only by the operating member and a second braking mechanism actuated only when no assist action is performed, allowing the assist action to increase liquid pressure in the second braking mechanism, thereby reducing pressure in the first mechanism and improving the operation feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the assist mechanism supplies auxiliary braking force to the front wheel when the rear wheel braking mechanism is activated, then the braking force of the rear wheel is improved, but the liquid pressure in the front wheel hydraulic passage becomes high making the operating lever hard to actuate
Solution Approach 1:
The front wheel braking mechanism is divided into two independent subsystems: a first braking mechanism (front master cylinder 21, first hydraulic passage 24, first caliper 23) that operates only when the operating member is actuated, and a second braking mechanism (second hydraulic passage 29, second caliper 28) that operates only when assist action is performed. This segmentation isolates the high-pressure assist operation from the manual operating lever, allowing the lever to remain soft while still enabling strong braking through the second mechanism during assist mode.
2Power
If the assist mechanism is activated to strengthen braking, then the braking effectiveness is improved, but the hardness of the operating member actuation increases due to high liquid pressure
Solution Approach 1:
The braking system is segmented into two independent mechanisms with separate hydraulic passages and calipers. The first braking mechanism handles manual operation only, while the second braking mechanism handles assist-only operation. This allows the system to achieve high braking power through the second mechanism during assist mode without increasing the complexity of the manual operation path.
Solution Approach 2:
Different parts of the front wheel braking system are assigned different functions: the first braking mechanism (with master cylinder) provides soft manual operation, while the second braking mechanism (without master cylinder) provides high-power assist braking. This local differentiation of quality allows each subsystem to optimize for its specific purpose without compromising the other.
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 reduces the hardness of the operating member's actuation and enhances the operation feeling by ensuring the assist action does not affect the first braking mechanism, resulting in a more responsive and sensitive braking experience.
Implementation Method 1
a first hydraulic passage (24) establishing communication and connection between the first caliper (23) and the front master cylinder (21)
Data Source
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AI summary
A braking apparatus provides improved operation feeling of an assisted braking action, and a straddle-type vehicle provided with the braking apparatus. A braking apparatus 16 is provided with a front wheel braking mechanism 17 braking a front wheel in response to operation of a front operating member 20, a rear wheel braking mechanism 18 braking a rear wheel in response to operation of a rear operating member 32, and assist mechanisms 19a, 19b assisting braking actions caused by the front wheel braking mechanism 17 and the rear wheel braking mechanism 18. At least one of the front wheel braking mechanism 17 and the rear wheel braking mechanism 18, for example, the front wheel braking mechanism 17 is provided with a first braking mechanism 17a and a second braking mechanism 17b. The first braking mechanism 17a is actuated only when the front operating member 20 is operated. The second braking mechanism 17b is actuated only when the front operating member 20 is operated in a case where no assist action is performed, and is actuated by the assist action in a case where the assist action is performed.