Analysis of automobile fixed clamp parts

Fixed caliper (fixed brake caliper) is one of the core components of the automotive disc brake system, corresponding to the floating caliper. Its main components and functions are as follows:

Caliper body:

Solid metal shell (usually cast iron or aluminum alloy)

Core function: Carrying all other components, rigidly fixed on the steering knuckle or axle, and not moving itself.

Hydraulic cylinder holes are machined inside.

Brake slave cylinder (piston):

Located in the cylinder hole of the caliper body, usually made of heat-resistant and pressure-resistant materials (such as steel or phenolic resin).

Core function: Directly receive the hydraulic pressure from the master brake cylinder and extend outward under the pressure.

Key point: The fixed caliper usually has pistons arranged on both sides, acting symmetrically on both sides of the brake disc.

Friction pad (brake pad):

It is composed of friction material and back plate.

Core function: The piston pushes the friction pad to directly press the working surfaces on both sides of the rotating brake disc, and the vehicle is decelerated or stopped by friction.

In the fixed caliper structure, the friction pads on both sides are actively pushed and pressed against the brake disc by the corresponding pistons.

Dust seal & piston seal:

Installed between the piston and the cylinder wall.

Function: Prevent water and dust from entering the cylinder (dust seal), keep the hydraulic system sealed and assist the piston return (piston seal).

Friction plate retainer/guide (spring/pin/clip):

Various forms of metal sheets, springs, pins or circlips.

Function: Ensure that the friction plate is properly positioned in the caliper body, eliminate abnormal vibration noise (such as squeaking), and allow the friction plate to move smoothly during braking and return slightly after release.

Core working features:

Rigid fixation: The caliper body itself will not slide or float during braking.

Dual-side pressure: The hydraulic pressure drives the pistons on both sides at the same time, pressing the friction plates on both sides directly against the brake disc. This design has good rigidity and more direct response, and is often used in high-performance or large-size brake systems, but it is also more complex and more expensive.

In short, the automobile fixed caliper, with its rigid caliper body and bilaterally symmetrically driven piston, directly applies balanced clamping force to both sides of the brake disc, and is a key component for vehicles that pursue high-performance braking response.