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Low-creep-noise friction material, brake pad and preparation method of brake pad

A friction material and brake pad technology, applied in the field of brake pads, can solve problems such as reducing the driving comfort of drivers, and achieve the effects of improving driving comfort, reducing the coefficient of dynamic and static friction, and stabilizing the coefficient of friction

Active Publication Date: 2020-03-13
SHANDONG GOLD PHOENIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The frequency of creeping noise is about 250Hz-500Hz, and it is a typical structural sound transmission. People inside the car can hear it more clearly than people outside the car, so it will seriously reduce the driving comfort of the driver.

Method used

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Examples

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Effect test

preparation example Construction

[0031] In order to achieve the above purpose and other related purposes, one embodiment of the present invention provides a method for preparing a brake pad with low creep noise, comprising the steps of:

[0032] The components of the friction material are weighed according to their proportions and stirred evenly to obtain a mixture; the stirring time is 11-13 minutes; if the time is too short, the stirring will be uneven; if the time is too long, the fibers will be crushed to affect the effect.

[0033] In a certain embodiment, the stirring time is 12 minutes.

[0034] Adding the mixed material into the mold cavity and flattening, then adding the cushion material and flattening, performing compression molding and demoulding to obtain a semi-finished product;

[0035] The semi-finished product is ground and sprayed to obtain the brake pad.

[0036] In a certain embodiment, the step of adding the cushion material and leveling it includes: weighing 11% of the mass of the mixtur...

Embodiment 1

[0049] Raw material formula of low creep noise metal brake pad friction material: 4% phenolic resin, 1% hydroxyl-terminated hyperbranched polyester, 1% terpene resin, 2% aramid pulp, 20% steel fiber, 10% mineral fiber, oxidation Magnesium 4%, zirconium silicate 5%, antimony sulfide 5%, tungsten sulfide 3%, superfine conductive graphite powder 2%, coke particles 8%, flake graphite 4%, fluororubber 5%, barite 26%.

[0050] Brake pad preparation method:

[0051] (1) Mixing: Add the above-mentioned raw materials into a high-speed mixer and stir for 12 minutes to make all raw materials mix evenly;

[0052] (2) Hot press molding: first add the mixture in step (1) to the mold cavity, flatten it with tools, then add cushion material, and flatten it with tools; the pressing temperature is 165°C, and the pressing pressure is 420kg / cm 2 , the pressing time is 6 minutes, demoulding after hot pressing to obtain a semi-finished product;

[0053] (3) Grinding: Grind the heat-treated brak...

Embodiment 2

[0057] Raw material formula of low creep noise metal brake pad friction material: 6% phenolic resin, 2% hydroxyl-terminated hyperbranched polyester, 1% terpene resin, 2% aramid pulp, 20% steel fiber, 10% mineral fiber, oxidation Magnesium 4%, zirconium silicate 5%, antimony sulfide 5%, tungsten sulfide 3%, superfine conductive graphite powder 2%, coke particles 7%, flake graphite 4%, fluororubber 5%, barite 25%.

[0058] Brake pad preparation method:

[0059] (1) Mixing: Add the above-mentioned raw materials into a high-speed mixer and stir for 12 minutes to make all raw materials mix evenly;

[0060] (2) Hot press molding: first add the mixture in step (1) to the mold cavity, flatten it with tools, then add cushion material, and flatten it with tools; the pressing temperature is 165°C, and the pressing pressure is 420kg / cm 2 , the pressing time is 6 minutes, demoulding after hot pressing to obtain a semi-finished product;

[0061] (3) Grinding: Grind the heat-treated brak...

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Abstract

The invention discloses a low-creep-noise friction material, a brake pad and a preparation method of the brake pad. The material comprises the following components in percentage by mass: 4-10% of phenolic resin, 1-2% of hydroxyl-terminated hyperbranched polyester, 1-2% of terpene resin, 1-3% of aramid pulp, 12-25% of steel fibers, 8-15% of mineral fibers, 3-8% of magnesium oxide, 4-8% of zirconiumsilicate, 3-7% of antimony sulfide, 2-4% of tungsten sulfide, 4-8% of crystalline flake graphite, 1-2% of superfine conductive graphite powder, 4-8% of coke particles, 2-5% of fluororubber and 25-35%of barite. The brake pad comprises a steel backing and a friction block matched with the steel backing for use, and the friction block is made of the friction materials. The preparation method comprises the following steps: weighing the components of the friction material according to a proportion, and performing uniform stirring to obtain a mixture; adding the mixture into a mold cavity, performing flattening, then adding a cushion material, performing flattening, and carrying out mold pressing and demolding to obtain a semi-finished product; and subjecting the semi-finished product to grinding and spraying so as to obtain the brake pad. The purpose of the present invention is to reduce creep and noise existing in a vehicle.

Description

technical field [0001] The invention relates to the technical field of brake pads, in particular to a friction material with low creep noise, a brake pad and a preparation method thereof. Background technique [0002] Creeping noise is a persistent problem in existing automatic transmission driving vehicles. Creep noise is also called start-up noise. Due to the existence of the hydraulic torque converter unique to automatic transmission vehicles, creep noise appears on almost all automatic transmission models. As long as the coupling point of the brake pedal is released, creep noise will appear in theory. It cannot be completely eliminated, it can only be suppressed or weakened. When the brake pedal is slowly released, the form of friction between the discs changes from static friction to dynamic friction, and the difference in the coefficient of dynamic and static friction Δμ is too large, causing the discs to vibrate and produce creeping noises such as "cuckoo" or "cluck"...

Claims

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Application Information

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IPC IPC(8): F16D69/02B29C43/02
CPCB29C43/02F16D69/02F16D2200/0021F16D2200/0052F16D2200/0065F16D2200/0086F16D2250/0046
Inventor 甄明晖王傅巍孙海燕
Owner SHANDONG GOLD PHOENIX
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