Shandong Kuangwei International Trade Co., Ltd. was established in 2020. The company is located in the factory of Sinotruk - Jinan City, Shandong Province. From 2010 to 2020, focus on the sales of truck parts in China, and then expand business abroad.There is many years of experience in parts sales.
Why Choose Us
Global shipping
Our products support global shipping and the logistics system is complete, so our customers are all over the world.
Quality assurance
We have 100% quality guarantee to customers. We will be responsible for any quality problem.
Reasonable price
Our products are complete in variety, good in quality, reasonable in price.
Best services
Excellent after-sales service, handling the customer complaint and solve problem for customers.
A brake drum is a cylindrical drum that is attached top the inside of a car’s wheel, and so rotates at the same speed as the wheel. The drum surrounds a set of brake shoes that are coated in materials that generate friction.
When the brake pedal is pressed, these shoes are pushed outwards against the inner surface of the brake drum, generating friction and so slowing the car down.
A brake drum is usually made of iron, rendering it resistant to wear.
An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the centers of the two gears and rotates, to carry the planet gear(s) around the sun gear. The planet and sun gears mesh so that their pitch circles roll without slip. If the sun gear is held fixed, then a point on the pitch circle of the planet gear traces an epicycloid curve.
Benefits of Shacman Hande 25T Brake Drum DZ9112342059
Durability: Since drum brakes have an increased friction contact area, they last longer.
Low cost: Drum brakes are cheaper to manufacture, hence they are more widely used on almost all types of vehicles.
Low input force: Some drum brakes require low input force to get them activated, meaning less push on the brake pedal, this can be done through various means like hydraulic pressure.
Low maintenance: Due to better corrosion resistance, as they are inside of a housing, they are slightly easier to maintain.
Benefits of Hande Planetary Gear 81.35609.0008
High power density: Power density is the amount of power (time rate of energy transfer) per unit volume. In case of planetary gears the load is shared by several planets instead of single gear like in other types of gearing, More the planets more the sharing of load and more the power density. As a result of which planetary gear box provide high power density in comparison to standard parallel axis gearboxes. Reduction due to high volume of planet gears, Multiple kinematic combinations, Purely torsional reactions, and coaxial shafting are the main parameters for high power density of planetary gears.
Compact size: Due to high power density and coaxial shaft arrangement, the planetary gearboxes are more compact. In case of planetary gear system, driving member and driven member are concentric and therefore driving and driven equipments could be installed in same line which will result space saving. More on use of multiple planet gears helps to achieve high gear ratios in small space. Due to this planetary gearboxes are more suitable to the applications which demand high speed reduction in compact space.
Light weight: High power density and compact size results into very light weight, due to which for same gear ratio or torque the planetary gearbox is more lighter as compared to other traditional (parallel shaft) kind of gearbox.
High efficiency: Less power losses (upto 3% each stage) results in to high efficiency of planetary gearboxes. The gearing arrangement of planetary gears tends to transfer maximum of input energy to desired output, due to which efficiency as high as up to 97% can be achieved for first stage of planetary gearbox.
Higher Gear reduction(in small space): In planetary gearbox the drive through prime mover is given to the sun. The sun gear then drives the planetary gears assembled within the external ring gear which is fixed. The whole set of planetary gears revolves along its own axis and along the ring gear where the output shaft is connected to the planetary carrier. Therefore by increasing the number of planet gears operating within the same ring gear very high reduction ratios can be achieved within small space.
High torque transmitting capacity: As the load in a planetary gear box is shared among multiple planets; therefore, torque transmitting capacity of planetary gearbox is very high. The torque transmission capacity can be further increased substantially by increasing the number of planet gears.
Highly stable: The planetary gear box is highly stable due to an even distribution of mass and increased rotational stiffness. Torque applied radially onto the gears of a planetary gear box is transferred radially by the gear, without lateral pressure on the gear teeth.
Types of Shacman Hande 25T Brake Drum DZ9112342059
Mechanical drum brakes: These are the most common type of drum brakes and are actuated by mechanical means, such as a brake pedal or a hand lever. When the driver presses the brake pedal, a mechanical linkage causes the brake shoes to press against the inside of the drum, creating friction and slowing down the vehicle.
Hydraulic drum brakes: In hydraulic drum brakes, hydraulic pressure is used to actuate the brake shoes against the drum. When the driver presses the brake pedal, hydraulic fluid is sent from the master cylinder to the wheel cylinders, which then push the brake shoes against the drum to create friction and slow down the vehicle.
Vacuum-assisted drum brakes: Vacuum-assisted drum brakes are similar to hydraulic drum brakes but use vacuum pressure instead of hydraulic pressure to actuate the brake shoes against the drum. A vacuum booster is used to amplify the force applied by the driver on the brake pedal, making it easier to apply the brakes and providing better braking performance.
Types of Hande Planetary Gear 81.35609.0008
Single-stage planetary gear set
Single-stage planetary gear set has a sun gear, three planet gears, a carrier, and the ring gear. Speed and torque of the output can be modified with the different size of gears and numbers of teeth.
Multi-stage planetary gear set
Multi-stage planetary gear sets have two or more planetary gears to have the required speed and torque. They have the same architecture as single-stage planetary gear sets.
In-line planetary gear set
Input and output shafts are in a straight line and contain a single sun gear and multiple planet gears contained in a ring gear in in-line planetary gear set.
Offset planetary gear set
Offset planetary gear sets are known as parallel shaft planetary gears. They have the input and output shafts placed in an offset or parallel position.
Right-angle planetary gear set
Input and output shafts are arranged at right angles with each other in right-angle planetary gear sets. Rotation of the planet gears transfers power to a right-angle bevel gear set that is connected to the output shaft.
Harmonic drive planetary gear set
Harmonic drive planetary gear sets are also known as strain wave gearboxes and wave generator gearboxes. Harmonic drive planetary gear sets have zero backlash, high precision, and high torque density.
Simpson planetary gear set
Simpson planetary gear set has a single sun gear and two or three sets of planetary carriers that are related in a series. It has a structure with three forward gears, one reverse gear, and a neutral.
Ravigneaux planetary gear set
This gear set is an advancement of the Simpson planetary gear set and includes two sun gears, two ring gears, and two sets of planet gears on a single carrier.
Differential planetary gear set
This gear set has a large ring gear, a carrier, two planet gears, and a sun gear. The ring gear is connected to the shaft of one of the wheels while the sun gear is attached to the other wheel, which makes it possible to change the rotation of the drive shaft to drive the wheels.
Application of Shacman Hande 25T Brake Drum DZ9112342059
Cars: Drum brakes are commonly found in the rear wheels of many cars. They offer reliable braking performance, especially in lighter vehicles where the braking demands may not be as extreme as in heavy-duty applications.
Motorcycles: Drum brakes have been traditionally used in motorcycles, particularly in older models. While disc brakes are now more common in modern motorcycles, drum brakes are still used in certain applications due to their simplicity, cost-effectiveness, and adequate braking performance.
Heavy-duty vehicles: Drum brakes are widely utilized in heavy-duty vehicles, such as trucks, buses, and commercial vehicles. These vehicles often require robust braking systems capable of handling higher loads and braking demands. Drum brakes provide the necessary braking force and durability required in these applications.
As well as uses for transmissions in vehicles, planetary gearboxes are used in many trades for different uses. They offer high exactness and high torque-to-volume ratio making them well suited to applications which involve; increasing torque, reducing speed, precise positioning and controlling reproducible machinery. Applications include;
- AGV’s
- Wheel drives
Winch drives
Slew drives
Track drives
Mixing
Pumps
Cutter heads
Renewable energy
Medical scanners
Operating tables
Petrochemical
Components of Shacman Hande 25T Brake Drum DZ9112342059
Drum
It is a metal part, usually made of cast iron, that rotates with the wheel. It is mounted on the wheel hub with lug studs. The inner surface of the drum forms the friction surface of the pads.
01
Wheel brake cylinder
This is also called the brake center in the industry (not the brake master center), the brake hose is connected to the brake cylinder with a union. By converting the hydraulic pressure into a thrust with the pistons inside, it presses the pads to the drum.
02
Brake shoes
It is a half-moon shaped metal piece on which the pads are riveted or glued. The piston brakes by pushing the shoes forward, and the return spring retracts the shoes.
03
Brake pads
It is the part on the shoes that opens outward with the shoe when the brake is pressed and rubs the drum, has a high friction coefficient and creates the braking effect.
04
Return springs
These are the springs that open outwards when the brake pedal is pressed and bring the brake shoes in contact with the drum back to their normal position by pulling back when the brake is released.
05
Components of Hande Planetary Gear 81.35609.0008
Ring gears
The ring gear components are located on the outside of the planetary gear. This component plays a very important role, namely as a lever for all components. The ring gear is connected to the pinion gear which is also connected to the central gear. That is why the performance of the ring gear is also affected by the central gear.
Sun gear
In the planetary gear there is also a sun gear which has fewer teeth when compared to the ring gear. Sun gear as the name suggests acts like the sun as the center of the solar system, namely the center of the planetary gear. Sun gear is the axis of all planetary gear components. Sun gear consists of 2 types, namely helical gear and spur gear.
Planetary pinion gear
The third component of the planetary gear is the planetary pinion gear. These are the components that surround the shaft or hub and are interconnected with the other gears. The planetary pinion gear has a smaller diameter and is mounted around the sun gear and is surrounded by a ring gear.
Drum brakes typically use cast iron as the common material for the brake drum. Cast iron is favored for its durability, heat resistance, and ability to dissipate heat effectively during braking. The brake shoes inside the drum are lined with friction material, commonly made of materials like asbestos, organic compounds, or semi-metallic compounds, which create the necessary friction to slow down or stop the vehicle when the brakes are applied. However, it's worth noting that asbestos has been phased out due to health and environmental concerns, and modern brake linings are typically made from safer materials.
Safety first
Replacing brakes shoes can release dusty hazardous materials into the air, especially if you are changing shoes on a car pre-1990’s with very old shoes. Wear a mask, work in a ventilated area, and make sure no one else approaches the vehicle during brake maintenance.
Prep your vehicle. Remove the wheel covers, then loosen the lug nuts. You want to do this before you lift the vehicle. Use a jack and stands to safely raise and support the vehicle. Also, the parking brake must be disengaged so the brake drum can be removed. For information on how to safely use a jack and stands, read our guide.
Remove and inspect the brake drum
To get to the brake shoes, you’ll need to remove the wheel and brake drum. The brake drum may be stuck on the axle hub. You may need to apply penetrant to get the drum off, or in worse cases, use a hammer on the face of the drum to break it loose. In really severe cases, the drum will need to be cut off, but this is a rare case. Keep in mind that some brake drums on front-wheel-drive cars have a hub with traditional cone bearings in it, and they can be removed with the spindle nut like traditional, older rotors, hub-and-drum altogether.
Remove any drum retaining screws or wheel stud retaining clips and slide the drum off. The retaining screws should be reinstalled later, but the clips may be removed permanently as these were used on the assembly line of the vehicle to keep a brake drum from falling off and bonking someone in the head. If you do see these clips, the chances are the brake shoes have never been serviced before. If the brake shoes are in tight contact with the inside of the drum, the brake adjustor screw will need to be shortened to relieve the pressure. This is accomplished by removing the small, rubber access port on the backing plate, and sticking a drum adjuster or large flathead screwdriving into the hole and turning the star wheel on the adjuster. Turning it one way will tighten the shoes against the drum. Turning it the other way will loosen the shoes. The drum should slide freely over the shoes for removal but often times will need the coaxing of a tap of a hammer, or gently pry from several pry bars.
With the brake drum off, clean and inspect it for heat stress cracks, hot spots, or deep gouging. Measure the inside diameter of the drum with a brake micrometer. The diameter specification should be stamped visibly on the outside of the drum. A brake drum with heat cracks, gouges severe hot spots, or that exceeds the specification limit should be discarded and replaced with a new drum. If you are within spec, these drums can be machined or “turned” at a machine shop.
Remove the brake shoes and hardware
The brake shoes are held in place by hold down and return springs. Specialty brake tools may be needed to make removal and reinstallation easier. The return springs have extreme tension. Use caution while removing and installing them.
It’s a great idea to either use a specific repair manual for your vehicle, or take detailed pictures of exactly how the springs go on, their orientation, and how the self-adjusting cables and springs go on. Everything has a specific way and orientation, so make sure you have it right! Another good practice is to do one side at a time, and leave the other in tact as a reference for how the items all work and go on.
Inspect and clean the remaining brake components
With the shoes and related system components removed, clean and inspect each item. It’s always a good idea to install new brake springs. Wheel cylinder replacement is also recommended if you see any wetness around the rubber ends, or the rubber seals are cracked. A wheel cylinder may develop a leak after the brake job is completed, so if you choose to replace them, now is the time to do it. If a wheel cylinder fails, the brake system fluid will become low and soak the brake components. Replacement of these items will ensure smooth, reliable braking performance.
Clean and inspect the parking brake components and the self-adjustor assembly. The adjustment screw will need to be cleaned, and lubricated with anti-seize. You will notice several small raised portions of the backing plate where the brake shoes pivot and rest against the backing plate. Clean these areas with a wire brush, and apply brake grease or anti-seize to these areas. Before doing this, if outside, you can chose to clean the entire backing plate with degreaser and a hose to remove old brake dust.
Re-install the brake shoes and components
Now it’s time to reassemble the brake parts.
First, lay out your brake shoes. You will notice that on the brake friction material, two of the shoes have a shorter piece of friction material and/or are thinner. Two of them have a longer piece of material and/or are thicker. This is what is known as a PRIMARY and SECONDARY shoe. The SECONDARY brake shoe, or the one that is thinner with less length of material always is the leading shoe, or the shoe pointing towards the front of the vehicle. The PRIMARY shoe is the tailing shoe, going towards the rear. Do not mix these up! This is one of the most common mistakes made when replacing brake shoes.
Start by installing the brake shoes with their hold-down springs, and the bottom adjuster wheel, noting it’s correct orientation. Now, you can begin to install the springs and self-adjusting hardware, making sure to follow your manual or photos carefully. Be very careful with tensioning and installing new springs, as many can be very difficult to re-install.
After assembly, you will need access to the brake adjustor star wheel when the brake drum is installed. It can be accessed through the backing plate or brake drum, depending on your vehicle – the same hole used to adjust the shoes when you removed them.
Install the brake drum
Make sure the brake shoes are clean and free of contamination. Slide the new or re-machined drum over the wheel studs and shoes onto the hub. If the drum won’t fit, adjust the star wheel to collapse the shoes farther in, so the drum slides over. If you replaced the wheel cylinders, bleed them now.
Now, use a brake adjusting tool or large flathead screwdriver now to adjust the brakes. To do so, reinstall the wheel and tire with several lug nuts.
Now, spin the wheel slowly. You will be adjusting the star wheel through the backing plate until you just feel the brake shoes lightly contact the brake drum. Do not overtighten. You should barely hear, and feel the shoes contact the drum, and there should be a very small amount of resistance over the wheel free-spinning.
Once you’ve accomplished this, your wheel/tire is ready for final lug nut torque. Once both sides are done, check brake fluid in the master cylinder, and prepare for a test drive.
Re-install the wheels and properly torque the wheel lug nuts. Reattach the wheel covers. Re-check the brake fluid level in the brake master cylinder. Prepare for test drive.
How to Maintain Shacman Hande 25T Brake Drum DZ9112342059
Check that the brake drum does not rust
Regular care of the brake drum to prevent it from rusting is one of the most important tips, as this part must be free of scratches and cracks on the friction side of the drum in order for the vehicle to brake. You don’t know how to keep brake drums from rusting? Here are very useful methods that will help you to properly clean the rust of the drum brake.
If it is necessary to replace the brake drum, this component must be replaced on both sides of the axle to avoid irregular functioning of the braking system.
Choosing a complete rear kit
If we are going to replace the components of the drum brake of our car, it is essential to always choose a quality rear kit that has all the necessary components for its correct repair.
Maintain a prudent speed
If we drive incorrectly, we press the brake pedal carelessly, this will have a negative effect on the wear of our vehicle's drum brakes.
In this regard, if you notice a vibration, shaking or noise when braking, you should go to the technical service or a workshop specialising in brake system repairs.
Check brake fluid
It is also important to monitor the brake fluid in your vehicle. It is therefore advisable to replace it every two years and always use a fluid recommended by the manufacturer.
Go to a reliable workshop
In the event that some of the aforementioned tips occur in the drum brake of our vehicle, it is necessary to visit a trusted workshop to check the condition of our braking system, as this is a fundamental component that guarantees our safety when driving.
How to Maintain Hande Planetary Gear 81.35609.0008
One of the most common failure modes of a planetary gear system is wear and tear, which occurs due to friction, load, and environmental factors. Wear and tear can cause the gears to lose their shape, alignment, and lubrication, resulting in noise, vibration, and reduced efficiency. To prevent wear and tear, you should regularly inspect the gears for signs of damage, such as cracks, pitting, spalling, or scoring. You should also replace the lubricant according to the manufacturer's recommendations, and use the appropriate type and amount of lubricant for your application.
Another common failure mode of a planetary gear system is overload and fatigue, which occurs when the gears are subjected to excessive stress, shock, or vibration. Overload and fatigue can cause the gears to deform, crack, or break, leading to catastrophic failure or loss of function. To prevent overload and fatigue, you should design the planetary gear system according to the expected load and speed conditions, and avoid sudden changes in torque or direction. You should also install protective devices, such as clutches, brakes, or sensors, to limit the maximum load and detect any abnormal conditions.
A third common failure mode of a planetary gear system is misalignment and backlash, which occurs when the gears are not properly aligned or have excessive clearance between them. Misalignment and backlash can cause the gears to skip, slip, or jam, resulting in noise, vibration, and reduced accuracy. To prevent misalignment and backlash, you should ensure that the gears are mounted on rigid and concentric shafts, and that the bearings and housings are in good condition. You should also adjust the backlash according to the specifications, and check it periodically for any changes.
A fourth common failure mode of a planetary gear system is corrosion and contamination, which occurs when the gears are exposed to moisture, dust, or other foreign particles. Corrosion and contamination can cause the gears to rust, erode, or wear out faster, affecting their strength and durability. To prevent corrosion and contamination, you should protect the planetary gear system from harsh environments, such as high humidity, temperature, or acidity. You should also clean the gears regularly, and use filters, seals, or covers to prevent any ingress of dirt or debris.
A fifth common failure mode of a planetary gear system is thermal expansion and contraction, which occurs when the gears experience significant changes in temperature. Thermal expansion and contraction can cause the gears to change their size, shape, or fit, resulting in stress, distortion, or interference. To prevent thermal expansion and contraction, you should design the planetary gear system with sufficient thermal clearance, and use materials that have similar coefficients of thermal expansion. You should also monitor the temperature of the gears, and avoid overheating or overcooling them.
How Brake Drums Work
Hydraulic wheel cylinders, brake shoes, and a brake drum make up a drum brake system. When the brake pedal is depressed, hydraulic wheel cylinders force two curved brake shoes with a friction material lining against the inner surface of a revolving brake drum.
As a result of this contact, friction is created, allowing the vehicle to slow or stop.
Pneumatic brake fluid is forced through the brake lines and into the brake cylinder when you press the brake pedal. A pair of springs in the cylinder is forced against a piston at each end of the cylinder.
Each piston is forced against one of the long, curved brake shoes attached to the wheel via the lug nuts. The shoe comprises a metal base and a friction-material pad that contact the drum, slowing and stopping the wheel.
How Do Planetary Gears Work?
Planetary gearboxes can be used in conjunction with internal combustion engines, electric motors, or hydraulic motors and are used because of their durability, efficiency, and ability to handle high torque loads. As mentioned above, the central “sun” gear is usually the input gear. Around it, two or more planet gears rotate within an outside ring gear and are connected to the output shaft via a carrier.
An example of how this can work is when the sun gear rotates and planet gears are held in place. As the sun gear turns, it causes the planet gears to rotate in place along the inside of the ring. This motion, in turn, rotates the output shaft in a reverse direction.
Drum Brakes vs Disc Brakes
|
Aspect |
Drum Brakes |
Disc Brakes |
|
Mechanism |
Friction generated by brake shoes pressing against the inside of a rotating drum. |
Friction generated by brake pads clamping against a rotating disc. |
|
Cooling |
Less effective cooling due to enclosed design and less air circulation. |
More effective cooling due to open design and better heat dissipation. |
|
Heat Dissipation |
Tends to retain heat, potentially leading to brake fade under heavy use. |
Efficient heat dissipation reduces the risk of brake fade even during prolonged heavy use. |
|
Braking Performance |
Can generate less initial bite and braking force |
Offers stronger initial bite and superior |
|
- |
under certain conditions. |
Overall braking performance. |
|
Maintenance |
Typically require less frequent maintenance. |
Generally require more maintenance due to exposed components. |
|
Weight |
Often heavier than disc brakes. |
Generally lighter than drum brakes. |
|
Complexity |
Simpler design with fewer parts. |
More complex design with additional components. |
|
Cost |
Often less expensive to manufacture and replace. |
Generally more expensive to manufacture |
|
Wet Conditions |
Can be less effective in wet conditions as water can accumulate inside the drum. |
More effective in wet conditions due to water dispersal and improved grip. |
|
Application |
Commonly used in rear wheels of vehicles. |
Commonly used in front wheels of vehicles. |
What Are the Signs That Indicate the Need for a Drum Brake Replacement?
The efficiency of a vehicle’s braking system is significant for on-road safety. So, you must pay close attention to any warning signs to see if there is a problem with the vehicle's drum brakes.
Mentioned below are the major signs that indicate the need for a drum brake replacement.
Noises from the vehicle: Noise from the vehicle's rear end while braking is a vital sign of bad drum brakes. The vehicle may also witness a reduced braking performance.
Loose parking brakes: If your vehicle has loose parking brakes that are not engaging, it can indicate a major issue with the drum brakes.
Trouble stopping the vehicle: When the drum brakes start to wear, the stopping time of a vehicle will increase and will not halt quickly.
Brake pedal vibration: You may notice performance issues with the brake pedal if the drum brakes are not functioning properly.
Our Factory
Shandong Kuangwei International Trade Co., Ltd. was established in 2020. The company is located in the factory of Sinotruk - Jinan City, Shandong Province. From 2010 to 2020, focus on the sales of truck parts in China, and then expand business abroad.There is many years of experience in parts sales.
Our Certificate
FAQ
We're well-known as one of the leading shacman chassis parts manufacturers and suppliers in China. Please feel free to buy original shacman chassis parts at competitive price from our factory. Good service and quality products are available.
Blocking pad SQ3002030KG01, Brake chamber assembly left SQ3519110KG10, Tie rod assembly SQ3003050KG01