Product Description

 

Product Description

Working principle of drum brake: Drum brake is mainly composed of brake base plate, brake drum, brake shoe, return spring, compression wheel and other parts. When braking, by stepping on the foot pedal and using the lever principle, the force of the push rod is applied to the brake master cylinder. After the pressure of the brake fluid is amplified and pushed the brake slave cylinder, the pistons at both ends of the brake slave cylinder will simultaneously push the same force to the shoe ends of the left and right brake shoes, and the other ends of the 2 brake shoes are supported by the support rod. At this time, the 2 brake shoes expand outward and fit with the inner surface of the brake drum to form friction, so as to achieve the purpose of braking. As the wheel is a rotating brake drum, the pressure acting on the brake shoe is asymmetric from left to right, resulting in self increasing and self reducing force. The friction torque of the force increasing brake shoe is 2 ~ 2.5 times that of the force reducing brake shoe, resulting in different wear degree of the 2 brake shoes

Specification

Product name:	Wheel Hub
Truck Model:	Sinotruk
Place of Origin:	ZheJiang , China
Model Number:	31FH-04015-B 3601S1
Key Words:	Sinotruk Piston
Size:	OEM Standard
Size:	OEM Standard
Certificate:	ISO9001:2008
Payment:	T/T,L/C ,Western Union

Certifications

Packaging & Shipping

1.To better ensure the safety of your goods, professional, environmentally friendly, convenient and efficient packaging services will be provided.details1. Our packing uses export wooden cases, plastic boxes, cartons or pallets. All the package are very strong, the wooden box is firmly bound, the package is covered with a waterproof film to prevent water or damage during transportation.Before packing, we can also stick corresponding labels and shipping marks according to your needs. All our goods are well packed.
2. According to the quantity, we can use express delivery, air transportation or CZPT transportation, automobile transportation, railway transportation, etc. we have our own freight forwarders, and we can also use the designated freight forwarders of customers, which can meet various delivery requirements of customers, such as EXW, FOB, CIF, etc.It can also be exported from many ports in China. Such as HangZhou port, HangZhou port, HangZhou port, ZheJiang port, HangZhou River and HangZhou in China.
3. We can also send the goods by express if the customers have less goods. According to customer’s request, we can use
express.such as DHL, TNT, EMS, FedEx, etc. the delivery time is 3-7. Safe, fast and convenient. It’s also a good choice for you.

Company Profile

Carman International Trade Co, Ltd. Ia an import and export company that founed in 2013, setting up with the approcal of Ministry of Commerce. Based on good faith and pursuit of mutual benefit, we supply Diesel engine spare parts for many domestic retailers and wholesalers, what’s more, our products are sold well to Japan, Korean, Malaysia, Indonesia, Germany, Russian, Turkey, Iran, Brazil, Peru, as well as other countries in the Middle East, and Africa etc.
The company has a number of diligent and advanced marketing and management experience of employees, for our customers to provide more professional, humane services. At the same time, the company vigorously develop advantageous products, integration and optimization of sales channels, in order to ensure quality at the same time, but also for dealers to retain a more careful profit margins. The company has innovative sales concept, high standards of product quality management as the basis, market as a guide, customer satisfaction as the criterion, the implementation of standardized customer service, forming a unique culture of high-quality service, customer service will fully implement the “customer guide, service value-added” strategy, in line with people-oriented, abide by the credibility, brand management, quality first, user first principle, so that more customers enjoy intimate service.
Our company focuses on auto parts quality and safety and service assurance, through China’s heavy vehicle and auto parts manufacturers excellent brand, the establishment of standardized, standardized sales and service system. Implementation of the “honesty-oriented, CZPT cooperation” concept, in a professional, efficient, systematic form, to provide customers with standardized consumer service platform. Our high-quality and excellent professional services from the product, variety, inventory, sales network perfect. Welcome to call to order accessories. Company to “quality-oriented, do fine and strong, sustainable development” as the quality policy, to “for the community, employees, customers, partners and enterprises themselves to seek reasonable interests” as the pursuit of the goal, warmly welcome business people from all walks of life to visit the guidance, business negotiations.

Our Advantages

auto parts are an important factor to support the healthy development of the automobile industry, especially construction machinery need to have higher requirements for different environments and different roads. The wear resistance, durability and tenacity of parts will have a direct impact on the safety of the vehicle itself and the driver. HangZhou CZPT International Trade Co., Ltd. has been committed to building excellent suppliers in the automobile industry for many years, providing high-quality vehicle and auto parts services for new and old customers. Our company was founded in 2013,Warehouse inventory is huge, and many kinds, to meet your various needs. The company has been adhering to the quality as the core,to serve customers as their responsibility, strict with themselves, has been China and the world a lot of quality inspection,china heavy truck spare parts has been exported to Russia, the United States, Europe and Southeast Asia and other countries.Our company is looking forward to your attention and visit.

FAQ

 

Q1. What is your spare parts packing?
A: We have cartons, wooden box, steel box and pallets for different spare parts to ensure safety of spare parts.
Q2. What is your terms of payment?
A: PayPal, Western Union, Money Gram, TT, LC. For Long-term business partners, we give credit payment terms as long as 6 months.
Q3. What is your terms of delivery?
A: EXW, FOB, CFR, CIF.
Q4. Is your spare parts genuine?
A: We trade original and genuine parts only! No copy spare parts can you get from us!
Q5. How about your delivery time?
A: Depending our order quantity, normally we can effect delivery within max. 10 days for even big quantities. We are based in ZheJiang and it is much easier and faster for courier and sea shipment.
Q6. What is your warranty for spare parts?
A: We guarantee all our spare parts are original and genuine, we offer 3 month to 12 months warranty for different spare parts.
Q7. Do you test all your spare parts before delivery?
A: Yes, our quality control staff will do PDI for each item we ship before delivery.
Q8. How do you ensure your package and shipment safety?
A: We will ensure all spare parts be in good condition by different packages. If any spare parts broken due to our package or shipment, we will compensate and send new spare parts!

How to Choose the Right Worm Shaft

You might be curious to know how to choose the right Worm Shaft. In this article, you will learn about worm modules with the same pitch diameter, Double-thread worm gears, and Self-locking worm drive. Once you have chosen the proper Worm Shaft, you will find it easier to use the equipment in your home. There are many advantages to selecting the right Worm Shaft. Read on to learn more.

Concave shape

The concave shape of a worm’s shaft is an important characteristic for the design of a worm gearing. Worm gearings can be found in a wide range of shapes, and the basic profile parameters are available in professional and firm literature. These parameters are used in geometry calculations, and a selection of the right worm gearing for a particular application can be based on these requirements.
The thread profile of a worm is defined by the tangent to the axis of its main cylinder. The teeth are shaped in a straight line with a slightly concave shape along the sides. It resembles a helical gear, and the profile of the worm itself is straight. This type of gearing is often used when the number of teeth is greater than a certain limit.
The geometry of a worm gear depends on the type and manufacturer. In the earliest days, worms were made similar to simple screw threads, and could be chased on a lathe. During this time, the worm was often made with straight-sided tools to produce threads in the acme plane. Later, grinding techniques improved the thread finish and reduced distortions resulting from hardening.
When a worm gearing has multiple teeth, the pitch angle is a key parameter. A greater pitch angle increases efficiency. If you want to increase the pitch angle without increasing the number of teeth, you can replace a worm pair with a different number of thread starts. The helix angle must increase while the center distance remains constant. A higher pitch angle, however, is almost never used for power transmissions.
The minimum number of gear teeth depends on the angle of pressure at zero gearing correction. The diameter of the worm is d1, and is based on a known module value, mx or mn. Generally, larger values of m are assigned to larger modules. And a smaller number of teeth is called a low pitch angle. In case of a low pitch angle, spiral gearing is used. The pitch angle of the worm gear is smaller than 10 degrees.

Multiple-thread worms

Multi-thread worms can be divided into sets of one, two, or 4 threads. The ratio is determined by the number of threads on each set and the number of teeth on the apparatus. The most common worm thread counts are 1,2,4, and 6. To find out how many threads you have, count the start and end of each thread and divide by two. Using this method, you will get the correct thread count every time.
The tangent plane of a worm’s pitch profile changes as the worm moves lengthwise along the thread. The lead angle is greatest at the throat, and decreases on both sides. The curvature radius r” varies proportionally with the worm’s radius, or pitch angle at the considered point. Hence, the worm leads angle, r, is increased with decreased inclination and decreases with increasing inclination.
Multi-thread worms are characterized by a constant leverage between the gear surface and the worm threads. The ratio of worm-tooth surfaces to the worm’s length varies, which enables the wormgear to be adjusted in the same direction. To optimize the gear contact between the worm and gear, the tangent relationship between the 2 surfaces is optimal.
The efficiency of worm gear drives is largely dependent on the helix angle of the worm. Multiple thread worms can improve the efficiency of the worm gear drive by as much as 25 to 50% compared to single-thread worms. Worm gears are made of bronze, which reduces friction and heat on the worm’s teeth. A specialized machine can cut the worm gears for maximum efficiency.

Double-thread worm gears

In many different applications, worm gears are used to drive a worm wheel. These gears are unique in that the worm cannot be reversed by the power applied to the worm wheel. Because of their self-locking properties, they can be used to prevent reversing motion, although this is not a dependable function. Applications for worm gears include hoisting equipment, elevators, chain blocks, fishing reels, and automotive power steering. Because of their compact size, these gears are often used in applications with limited space.
Worm sets typically exhibit more wear than other types of gears, and this means that they require more limited contact patterns in new parts. Worm wheel teeth are concave, making it difficult to measure tooth thickness with pins, balls, and gear tooth calipers. To measure tooth thickness, however, you can measure backlash, a measurement of the spacing between teeth in a gear. Backlash can vary from 1 worm gear to another, so it is important to check the backlash at several points. If the backlash is different in 2 places, this indicates that the teeth may have different spacing.
Single-thread worm gears provide high speed reduction but lower efficiency. A multi-thread worm gear can provide high efficiency and high speed, but this comes with a trade-off in terms of horsepower. However, there are many other applications for worm gears. In addition to heavy-duty applications, they are often used in light-duty gearboxes for a variety of functions. When used in conjunction with double-thread worms, they allow for a substantial speed reduction in 1 step.
Stainless-steel worm gears can be used in damp environments. The worm gear is not susceptible to rust and is ideal for wet and damp environments. The worm wheel’s smooth surfaces make cleaning them easy. However, they do require lubricants. The most common lubricant for worm gears is mineral oil. This lubricant is designed to protect the worm drive.

Self-locking worm drive

A self-locking worm drive prevents the platform from moving backward when the motor stops. A dynamic self-locking worm drive is also possible but does not include a holding brake. This type of self-locking worm drive is not susceptible to vibrations, but may rattle if released. In addition, it may require an additional brake to keep the platform from moving. A positive brake may be necessary for safety.
A self-locking worm drive does not allow for the interchangeability of the driven and driving gears. This is unlike spur gear trains that allow both to interchange positions. In a self-locking worm drive, the driving gear is always engaged and the driven gear remains stationary. The drive mechanism locks automatically when the worm is operated in the wrong manner. Several sources of information on self-locking worm gears include the Machinery’s Handbook.
A self-locking worm drive is not difficult to build and has a great mechanical advantage. In fact, the output of a self-locking worm drive cannot be backdriven by the input shaft. DIYers can build a self-locking worm drive by modifying threaded rods and off-the-shelf gears. However, it is easier to make a ratchet and pawl mechanism, and is significantly less expensive. However, it is important to understand that you can only drive 1 worm at a time.
Another advantage of a self-locking worm drive is the fact that it is not possible to interchange the input and output shafts. This is a major benefit of using such a mechanism, as you can achieve high gear reduction without increasing the size of the gear box. If you’re thinking about buying a self-locking worm gear for a specific application, consider the following tips to make the right choice.
An enveloping worm gear set is best for applications requiring high accuracy and efficiency, and minimum backlash. Its teeth are shaped differently, and the worm’s threads are modified to increase surface contact. They are more expensive to manufacture than their single-start counterparts, but this type is best for applications where accuracy is crucial. The worm drive is also a great option for heavy trucks because of their large size and high-torque capacity.