German Mobac brakes, Mobac models, Mobac prices

Mobac brakes are connectors that transmit torque from the driving side to the driven side. They can be freely engaged, disengaged, or braked as required, offering advantages such as compact structure, simple operation, sensitive response, long service life, reliable use, and ease of remote control. Electromagnetic brakes are ideal automation actuators in modern industry, primarily serving to transmit power and control motion in mechanical transmission systems.

Mobac brake classification

1) Friction brakes, which can be divided into disc brakes, external shoe brakes, internal expanding shoe brakes, band brakes, combined band brakes, double-shoe brakes, multi-shoe brakes, simple band brakes, single-disc brakes, multi-disc brakes, fixed caliper brakes, floating caliper brakes, etc. 2) Non-friction brakes, which can be divided into magnetic powder brakes, magnetic eddy current brakes, water eddy current brakes, etc.

Mobac brake working principle

The general working principle of a braking system is to prevent wheel rotation or the tendency to rotate by using friction between non-rotating elements connected to the vehicle body (or frame) and rotating elements connected to the wheels (or drive shaft). A simple schematic diagram of a hydraulic braking system can illustrate the working principle. A metal brake drum, with its inner cylindrical surface as the working surface, is fixed to the wheel hub and rotates with the wheel. On the stationary brake backing plate, two anchor pins support the lower ends of two arc-shaped brake shoes. Friction linings are installed on the outer cylindrical surfaces of the brake shoes. The brake backing plate is also equipped with hydraulic wheel cylinders, connected via oil pipes 5 to the hydraulic master cylinder mounted on the frame. The piston 3 in the master cylinder can be operated by the driver through the brake pedal mechanism. When the driver presses the brake pedal, compressing the brake fluid, the wheel cylinder pistons press the brake shoes against the brake drum under hydraulic pressure, reducing the rotational speed of the brake drum or keeping it stationary. When learning about the braking system of a specific car model, you may often hear the term "front disc, rear drum." What does this mean? Some readers have emailed questions about automotive braking systems, such as the differences between disc brakes and drum brakes, and the differences between ventilated discs and solid discs. Many mid-to-low-end vehicles with smaller engine displacements in the auto market mostly adopt a "front disc, rear drum" configuration, meaning disc brakes are used on the front wheels and drum brakes on the rear wheels. Examples include the common FAW-Volkswagen Jetta, Changan Suzuki Alto and Antelope, BYD Folaier, Dongfeng Yueda Kia Qianlima, and Shanghai GM Sail, among others. Let us first briefly understand the drum brakes commonly used on rear wheels. The practical difference is significant; disc brakes are better than drum brakes. Both drum and disc brakes have their pros and cons. In terms of braking effect, the difference between disc and drum brakes is not substantial, as braking relies on converting kinetic energy into heat. If the vehicle is small and lightweight, drum brakes on the rear wheels are sufficient. In terms of heat dissipation, disc brakes dissipate heat faster than drum brakes, with ventilated disc brakes offering even better performance. In terms of sensitivity, disc brakes are higher; however, in rainy or muddy conditions, if mud and sand adhere to the drum brake, the braking effect is significantly reduced, which is a disadvantage of drum brakes. In terms of cost, drum brakes are cheaper than disc brakes and have a longer service life, so many mid-to-low-end cars use drum brakes, while mid-to-high-end models basically adopt four-wheel disc brakes. From an economic and practical perspective, automotive designers generally adopt a hybrid form for sedans: disc brakes on the front wheels and drum brakes on the rear wheels. During the braking process of a four-wheel sedan, due to inertia, the load on the front wheels usually accounts for 70% to 80% of the total vehicle load, so the front wheel load is greater than the rear wheel load. To save costs, car manufacturers adopt front disc brakes and rear drum brakes. For mid-to-high-end sedans with four-wheel disc brakes, ventilated disc brakes are used on the front wheels for better heat dissipation, while non-ventilated disc brakes are used on the rear wheels, also due to cost considerations. After all, the manufacturing process for ventilated discs is much more complex, making them relatively more expensive. With the development of materials science and reduced costs, disc brakes are gradually replacing drum brakes in the sedan sector. Brakes apply braking torque to rotating elements via fixed elements within them, reducing the angular velocity of the latter. Simultaneously, relying on the adhesion between the wheels and the ground, road resistance generates braking force on the wheels to decelerate the vehicle. Any brake that generates braking torque through friction between the working surfaces of fixed and rotating elements is called a friction brake. Friction brakes used in automobiles can be divided into two main categories: drum and disc. Brakes where the rotating element is fixed to the wheel or half-shaft, meaning the braking torque acts directly on the wheels on both sides, are called wheel brakes. Brakes where the rotating element is fixed to the transmission shaft of the drivetrain, and its braking torque is distributed to the wheels on both sides via the drive axle, are called central brakes.

Mobac brake self-adjusting device

When the brake shoes are in their original non-operating position, there should be an appropriate gap between the friction lining and the brake drum. This setting value is specified by the automobile manufacturer, generally between 0.25 and 0.5mm. If this gap (hereinafter referred to as brake clearance) in any brake friction pair is too small, it is difficult to ensure complete release of the brake, causing dragging of the friction pair; if it is too large, the brake pedal travel will be too long, causing inconvenience for the driver and delaying the onset of braking action. However, during brake operation, continuous wear of the friction lining leads to a gradual increase in brake clearance. In severe cases, even pressing the brake pedal to its lowest limit position will not generate sufficient braking torque. Most sedans are equipped with brake clearance self-adjusting devices, while some trucks still use manual adjustment. Brake clearance adjustment is an important item in automobile maintenance and repair. Depending on the working process, it can be divided into one-time adjustment and stepwise adjustment types. The figure on the right shows a friction-limiting type clearance self-adjusting device located inside the brake wheel cylinder. The limiting friction ring 2, which limits the inner limit position of the brake shoes when not braking, is installed in the ring groove at the inner end of the wheel cylinder piston 3. The width of the ring groove or spiral groove on the piston is greater than the thickness of the limiting friction ring. The maximum axial displacement of the piston relative to the friction ring is the gap between them. This gap should equal the wheel cylinder piston stroke required to achieve full braking when the brake clearance is at the set standard value. During braking, the wheel cylinder piston moves outward. If the brake clearance increases beyond the set value due to various reasons, the piston moves outward to 0 but still cannot achieve full braking. However, the wheel cylinder continues to push the piston together with the friction ring until full braking is achieved. Thus, when the brake is released, the brake shoes can only return to the point where they contact the limiting friction ring in its new position, meaning the brake clearance is reset to the specified value.

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