Commercial Vehicle Disc Brake Pad Retention With One-Sided Hold-Down
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Solution Overview
Problem
Existing disc brake systems for commercial vehicles, particularly sliding caliper brakes, face challenges in achieving good braking behavior with complex designs and require efficient methods for securing and mounting brake pads, which can lead to increased weight, cost, and potential issues with oblique wear.
Innovation Solution
A disc brake design featuring a sliding caliper with a central caliper opening, allowing for easy insertion and secure radial locking of brake pads using a hold-down bracket that only secures the reaction-side pad, reducing material usage and weight, and employing a pad spring for the application-side pad to enhance radial positioning and prevent oblique wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hold-down bracket is used to secure brake pads radially in the pad shaft, then the brake pad positioning is improved and oblique wear is prevented, but the device complexity and material usage increase
Solution Approach 1:
The brake system is segmented by applying the hold-down bracket only to the reaction-side brake pad, while the application-side brake pad uses a different securing method (projection and recess engagement). This segmentation reduces overall device complexity while maintaining reliable positioning for both pads.
Solution Approach 2:
Instead of securing both brake pads with hold-down brackets, the invention applies the bracket partially - only to the reaction-side brake pad. This partial action is sufficient to prevent oblique wear and ensure proper positioning, thereby reducing material usage and device complexity while maintaining the necessary reliability.
2Reliability
If both brake pads are secured radially with hold-down brackets, then radial positioning is improved, but weight and cost increase due to additional material usage
Solution Approach 1:
The hold-down bracket is applied partially - only to the reaction-side brake pad - rather than to both pads. This partial application provides sufficient radial securing to prevent oblique wear and ensure proper positioning, while reducing the total material usage, weight, and cost of the brake system.
Solution Approach 2:
The brake system is divided into two different securing approaches: the reaction-side pad uses a hold-down bracket for radial securing, while the application-side pad uses projection-recess engagement. This segmentation allows the system to achieve reliable radial positioning with reduced material usage compared to securing both pads with brackets.
3Ease of operation
If a central caliper opening is provided for easy brake pad insertion, then ease of operation is improved, but a pad retaining bracket is required which increases device complexity
Solution Approach 1:
The brake pad securing approach is segmented based on position: the reaction-side brake pad uses a hold-down bracket for radial securing, while the application-side brake pad uses projection-recess engagement. This segmentation allows the central caliper opening to remain useful for easy insertion while reducing the need for complex retaining structures across the entire system.
Solution Approach 2:
Instead of using hold-down brackets for both brake pads, the invention applies the bracket partially - only to the reaction-side pad. Combined with the projection-recess engagement on the application-side pad, this partial application provides sufficient retaining function while simplifying the overall pad retaining structure and reducing device complexity.
4Device complexity
If projection and recess engagement is used to secure the application-side brake pad, then radial securing is achieved without hold-down bracket, but the mounting precision requirements increase
Solution Approach 1:
The brake system uses different securing methods for different pads: the application-side pad uses projection-recess engagement to reduce device complexity, while the reaction-side pad uses a hold-down bracket to compensate for the higher precision requirements of the projection-recess method. This segmentation balances the trade-off between complexity and precision requirements.
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
The design simplifies the mounting process, reduces weight and cost, and minimizes oblique wear by securely positioning brake pads with a lightweight and cost-effective solution that maintains effective braking performance.
Implementation Method 1
a pad spring (130) on the reaction side, which is secured in a load-transmitting manner in the brake carrier (3) and has a free end which resiliently supports the brake pad (200) in its inner pad shaft (12)
Implementation Method 2
the application-side brake pad (100) is secured radially in the brake carrier (3) in its pad shaft (11) by means of a form fit
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
The invention relates to a disc brake (100) for a commercial vehicle, comprising: a brake calliper (1), preferably in the form of a sliding calliper, straddling a brake disc (2), being arranged on a fixed backing plate (3), and having an application device for applying the brake; two brake pads (100, 200), each having a pad carrier (110, 210) and an affixed friction pad (120, 220), and each being inserted into a pad shaft (11, 12) of the backing plate (3); wherein the brake calliper has a central calliper opening (1d) over the disc brake (2); and wherein a hold-down bar (250) is provided, designed in such a way that, of the two brake pads (100, 200), it radially secures only the reaction-side brake pad in its lining shaft (11, 12) in the backing plate, the hold-down bar (250) being held on the brake calliper (1) by its end facing away from the brake pad (200); wherein additionally the application-side brake pad (100) is radially interlockingly secured in its pad shaft in the backing plate; and wherein the application-side brake pad (100) has a brake pad spring (130), which is held on the application-side brake pad (100) and comprises ends (133, 134) which rest resiliently on horns (13, 14) of the backing plate (3).