The working principle and maintenance of forklifts, forklift drum brakes

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The drum brake drum brake early design of the braking system, the design of the brake drum 1902 has been used

in the carriage, until around 1920 in the auto mobile industry wide application. The mainstream of drum brakes

are Zhang type, its brake block (brake shoe) is located in the wheel brake the inside of the brake when the

brake pads out there and the inside of the friction brake wheel to brake purpose.
From the floor, the typical drum brake, brake drums, brake shoes, wheel cylinder (brake wheel cylinders), the

return spring locating pin and other component parts. The plate is installed in a fixed position of the axle,

which is fixed, fitted with brake shoes, wheel cylinder, return spring, the pin, under the rotation torque

when the brake. Each drum with a pair of brake shoes, brake shoe linings. Brake drum installed in the wheel

hub, together with the wheel rotating parts, which is made by a certain amount of cast iron, shaped like a

garden drum. When braking, the wheel cylinder piston driven brake shoe compression brake drum, brake dru m

friction reducer, forcing the wheel to stop turning.skidsteer pallet forks

Drum brake - the advantages and disadvantages
Drum brakes, drum brakes, brake performance an d heat dissipation must be much worse, the poor stability of the

braking force of drum brakes, the braking force on a different road varies greatly,used skid steer buckets
not ea sy to control. Due

to poor heat dissipation, will gather a lot of heat during braking. Brake block and wheel drums are more prone

to high temperature under the influence of a very complex deformation, prone to brake recession and vibration

shaking phenomenon, causing decreased braking efficiency. In addition, the drum brakes in use for some time,

to regularly adjust the brake hoof gap, or even that the entire brake drum brake powder demolition, including

clean up accumulated. Of course, the drum brake was not completely useless, it cost cheaper, and in line with

the traditional design. Four cars during braking, due to the inertia of the role of front-wheel load typically

accounts for 70% -80% of all car load ** front wheel braking force than the rear wheel from the auxiliary

braking effect, so the car manufacturers in order to save costs, the braking Qianpanhougu.

Drum brake - How it works
Drum brakes in the car brake drum, generally only one wheel cylinder, wheel cylinder when the brake by force

from the master cylinder hydraulic cylinder at both ends of the piston top to the left and right brake shoe

hoof side equal . However, due to the wheel is rotating, the pressure of the brake shoe, brake drum role in

asymmetry, caused by their own by force or less force on their own. Therefore, the industry will increase

their own power side of the brake hoof known as the collar hoof, self-less force side of the brake shoe called

from the hoof, the friction torque collar hoof from the hoof of 2 to 2.5 times, the two brake shoes the degree

of wear of the friction linings are not the same.
In order to maintain a good braking efficiency, brake between the hoof and the brake drum to have a best

clearance values. With the friction lining wear, brake shoes and b rake drum clearance between the increases,

the need for an adjustment gap body. The drum brake in the past need for manual adjustment, adjust the gap

with a feeler. Now the car drum brakes are used to automatically adjust the friction lining wear will

automatically adjust the brake drum clearance. When the gap increases, the brake shoe launched more than a

certain range, adjust the clearance agencies will adjust lever (pawl) pulled and adjustment of the tooth under

a tooth bonding position, thereby increasing the length of the rod, so that the brake shoe The location of

displacement and return to normal clearance.

Car drum brakes are generally used for the rear wheels (front wheel disc brakes). Drum brakes in addition to

relatively low cost, One of the advantages is the ease of parking (parking) brake combination, who rear-wheel

drum brakes of the car, the parking brake combination on the rear brakes . This is a mechanical system, it is

completely car brake hydraulic system is separate: the use of hand joystick or pedal in cars (American cars)

taut steel cables, manipulation of drum brakes, bars extended brake shoe, play the role of parking brake, the

car will not slip move; release the steel cables, return spring and brake shoe back into place, the braking

force disappears.