Rear Enlarged Car Brake Disc 370*22mm Black Bell For BMW G38

Jekit Car Brake Rear Enlarged Disc 370*22mm Fit For BMW G38

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Fixed caliper disc brake
The structure diagram of the fixed caliper disc brake is shown in the figure on the right. The brake caliper body 5 straddled on the brake disc 1 is fixedly installed on the axle 6, and it cannot rotate or move along the axis of the brake disc. side. When braking, the brake fluid enters the two connected hydraulic chambers in the caliper body from the brake master cylinder (brake master cylinder) through the oil inlet 4, and presses the brake pads 3 on both sides to be fixedly connected to the wheels. the brake disc 1 to generate braking.
This kind of brake has the following shortcomings: there are many oil cylinders, which makes the structure of the brake caliper complex; the oil cylinders are located on both sides of the brake disc, and must be connected by the inner oil passage or external oil pipe of the caliper spanning the brake disc, which makes the brake The size of the caliper is too large to be installed in the rim of a modern car; when the thermal load is large, the brake fluid in the oil cylinder and the oil pipe or oil passage across the brake disc is easily vaporized by heat; if it is to be used as a parking brake, it must be Add a mechanically actuated parking brake caliper.
Floating Caliper Disc Brakes
The brake caliper body 2 is connected to the axle 7 through the guide pin 6 and can move axially relative to the brake disc 1 . The brake caliper body is only provided with oil cylinders on the inner side of the brake disc, while the outer brake pads are attached to the caliper body. When braking, the hydraulic oil enters the brake cylinder through the oil inlet 5, pushes the piston 4 and the friction block on it to move to the right, and presses it on the brake disc, so that the cylinder and the brake caliper body as a whole move to the left along the pin. Move until the friction pad on the right side of the disc also presses onto the disc, grips the disc and brakes it.
In contrast to fixed-caliper disc brakes, floating-caliper disc brakes have smaller axial and radial dimensions and less chance of the brake fluid being heated and vaporized. In addition, when the floating caliper disc brake is used as both the service and the parking brake, it is only necessary to install some parking brake mechanical transmission parts near the service brake caliper cylinder to push the cylinder piston. Therefore, since the 1970s, floating caliper disc brakes have gradually replaced fixed caliper disc brakes.
Features of Disc Brakes
Compared with drum brakes, disc brakes have the following advantages: Generally, there is no friction boosting effect, so the brake performance is less affected by the friction coefficient, that is, the performance is more stable; the performance is less reduced after immersion in water, and only one or two passes are required. It can be restored to normal after only one braking operation; under the condition of the same output braking torque, the size and mass are generally small; the thermal expansion of the brake disc along the thickness direction is extremely small, and the brake clearance will not be obvious like the thermal expansion of the brake drum. The brake pedal travel is too large due to the increase; it is easier to realize the automatic adjustment of the gap, and other maintenance and repair operations are also simpler. For caliper disc brakes, because the brake disc is exposed, there is also the advantage of good heat dissipation. The disadvantage of disc brakes is that their efficiency is low, so when they are used in hydraulic braking systems, the brake actuation line pressure is relatively high, and servo devices are generally used.

At present, disc brakes have been widely used in cars, but in addition to being used for all wheels on some high-performance cars, most of them are only used as front wheel brakes, and cooperate with the drum brakes of the rear wheels, so that the car has a higher standard. directional stability when moving. In trucks, disc brakes are also used, but there is still a considerable distance from popularization.