China Standard 3V Series Cast Iron Eight-Groove Sheaves Pulley with Split Taper Bushings pulley design

Product Description

Product Description

3V series eight-groove taper bushed sheaves are manufactured for 3V, 3VX, banded 3V, and banded 3VX belts. They range from 4.75″ to 33.50″ in diameter. Depending on the sheave size, they are made to use a Q2, R1, or S1 split-taper bushing, which we also stock. Most of our eight-groove 3V split taper sheaves are manufactured from a high-strength grade 35 cast iron, are phosphate-coated, and are painted for anti-corrosion. All of them are balanced at the factory for smooth machinery operation.

Product Parameters



Bushing Type

Pitch Diameter

Outside Diameter











Sheave Weight (LBS)

8Q3V47 Q2 4.70″ 4.75″ 5 4 9/16 3 1/2 3/4 25/32 4 1/8 3 17/32 2 3/4 9/32 7.3
8Q3V50 Q2 4.95″ 5.00″ 5 4 9/16 3 1/2 3/4 25/32 4 1/8 3 17/32 2 3/4 9/32 8.6
8Q3V53 Q2 5.25″ 5.30″ 5 4 9/16 3 1/2 3/4 25/32 4 1/8 3 17/32 2 3/4 9/32 10.3
8Q3V56 Q2 5.55″ 5.60″ 15 3 25/32 3 1/2 1/32 0 4 1/8 3 17/32 3/4 2 3/4 9/32 12.3
8Q3V60 Q2 5.95″ 6.00″ 15 3 25/32 3 1/2 1/32 0 4 1/8 3 17/32 3/4 2 3/4 9/32 15.1
8Q3V65 Q2 6.45″ 6.50″ 13 4 11/64 3 1/2 23/64 25/64 4 1/8 3 17/32 3/4 2 3/4 9/32 18.3
8Q3V69 Q2 6.85″ 6.90″ 13 4 11/64 3 1/2 23/64 25/64 4 1/8 3 17/32 3/4 2 3/4 9/32 21.4
8R3V80 R1 7.95″ 8.00″ 13 3 59/64 3 1/2 7/64 49/64 5 3/8 3 17/32 7/8 2 9/32 23.3
8R3V106 R1 10.55″ 10.60″ 13 3 59/64 2 7/8 7/64 49/64 5 3/8 3 17/32 7/8 2 9/32 24.5
8R3V140 R1 13.95″ 14.00″ 13 3 59/64 2 7/8 7/64 49/64 5 3/8 3 17/32 7/8 2 9/32 39.0
8R3V190 R1 18.95″ 19.00″ 13 3 59/64 2 7/8 7/64 49/64 5 3/8 3 17/32 7/8 2 9/32 49.0
8R3V250 R1 24.95″ 25.00″ 13 3 59/64 2 7/8 7/64 49/64 5 3/8 3 17/32 7/8 2 9/32 76.0
8S3V335 S1 33.45″ 33.50″ 13 4 55/64 4 3/8 61/64 7/64 6 3/8 3 17/32 1 1/16 3 5/16 3/8 128.0


Company Profile

HZPT is a professional manufacturer of mechanical parts. Our main products are belt pulleys, sprockets, taper sleeves, coupling, and other transmission parts. Its products are mainly exported to Germany, Britain, France, and other European countries, with an annual export value of 18 million US dollars, accounting for more than 65% of the total output. The annual output value reached 200 million yuan.

Our products all adopt international, European, and American advanced industrial standards, use precise and good processing equipment, develop reasonable production technology, apply efficient and flexible management systems, and improve the quality management system to ensure that the product quality is good and the price is affordable.

Our factory adheres to the enterprise concept of “quality: the basis of enterprise survival, integrity: the basis of enterprise development, service: the source of enterprise development, low price: the instrument of enterprise development.” We are always looking CZPT to the presence of customers at home and abroad, seeking CZPT benefits and joint cause development.

Warehouse Stock

The warehouse covers an area of 5000 square CZPT and can provide all kinds of standard models A/B/C/Z, with complete quantity and large quantity in stock. Meanwhile, it accepts all sorts of non-standard customization for drawing production. The daily production capacity is 10 tons, and the delivery time is short.

Packaging & Shipping


Experienced Workers Packing Pulleys Carefully, safe wooden cases keep parts from being injured or damaged during sea or air shipment.


QD bushing pulley
The manufacturing tolerance of the QD bushing pulley is accurate. They have different diameters and can be statically or dynamically balanced. These pulleys are made of grey cast iron from GG 25 to GG 30. They have a strength of 207 Mpa and a hardness of 187 to 241.
One side of the QD housing has a fully split flange and a straight flange around the outside diameter. The flange fits closely and requires a hex head screw to install the component. When the screws are tightened, the flange compresses and draws the identification part on the bushing.
Why choose the QD bushing pulley?
The QD bushing pulley has many advantages over the traditional V-pulley. They are more cost-effective and ideal for use with non-critical ratio drives. It is characterized by a cylindrical CZPT with a radial shape, which can reduce friction in the hole and limit the movement of mechanical parts. They fit well with the hub in the sprocket.

Warehouse inventory
The warehouse covers an area of 5000 square CZPT and can provide various A/B/C/Z standard models with total quantities and a large inventory. At the same time, different non-standard customized drawings are accepted. The daily output is 10 tons, and the delivery time is short.

Company Information



Type: Agricultural
Usage: Agricultural Products Processing, Farmland Infrastructure, Tillage, Harvester, Planting and Fertilization, Grain Threshing, Cleaning and Drying
Material: Iron
Power Source: Electricity
Weight: 6kg
After-sales Service: Installation Guide 3-Year Warranty


The Mechanical Advantage of a Pulley

A pulley is an important tool for many tasks. The advantage that it offers over a hand-held mechanism is its mechanical advantage. In this article, we’ll discuss the types of pulleys and their applications. We’ll also look at the types of compound pulleys. And, of course, there’s a little bit about the mechanical advantage of a pulley. This article will help you decide whether this tool is right for your needs.

Mechanical advantage of a pulley

A pulley has a mechanical advantage over a lever because it is able to produce more force over longer distances. The mechanical advantage of a pulley sounds brilliant and could produce energy. But what exactly is this mechanical advantage? Let’s take a look. First, consider how a pulley works. A rope supports a 100kg mass, which requires 500 newtons of force to lift. If the rope supports a 100kg mass, two sections of rope can support that load. Using a pulley, you can lift the same weight with half the force.
A pulley’s ideal mechanical advantage is the ratio of the force applied to the total length of the rope. The larger the radius, the greater the mechanical advantage. A pulley made up of four rope segments has an ideal mechanical advantage of four. Therefore, a four-segment pulley would multiply the force applied by four. As the numbers on the rope segments are smaller than the total length of the rope, it would be better to use a compound pulley.
The mechanical advantage of a pulley can be calculated by using the T-method. The first step in calculating the mechanical advantage of a pulley is defining the force you need to lift. Then, divide that force by two to calculate the amount of force you need to lift the load. Once you know this amount, you can design a pulley to meet your needs. That way, you can achieve the perfect balance between the two types of pulleys.

Types of pulleys

The main function of the pulley is to change the direction of the force. The mechanical advantages of a single pulley are two. Ideally, two pulleys should have two or more mechanical advantages. The mechanical advantage of compound pulleys can be increased to two or more. The number of pulleys that make up the composite pulley will determine the mechanical advantage. Certain types of pulleys are combined in one housing.
A stepped pulley is a set of pulleys with stepped surfaces. Each face is anchored to the mid-axis in an ordered sequence. This design gives these pulleys their name. They are used to increase and decrease the speed of the driven pulley. Step pulleys are usually used in pairs. They can be straight or stepped, but usually come in pairs.
The three main types of pulleys are pulleys, rope pulleys, and chain pulleys. Pulley Pulley systems use mechanics to lift and lower heavy objects. The Greek historian Plutarch credits the invention of the pulley to Archimedes of ancient Sicily. The Mesopotamians used rope pulleys to lift water around 1500 BC, and Stonehenge is said to have been built using a rope pulley system.

Application of pulley system

The advantages of using a pulley system are numerous. The ability to lift heavy objects is a good example. The pulley system makes it easy for people to lift blocks and other large objects. It can be used in many different applications, from utility elevators to construction cranes. In addition, it is widely used on sailing boats. If you want to learn more about the benefits of a pulley system, keep reading!
You can use the pulley system to water flowers or water plants. Some of them even lowered the pot to make cleaning easier. Pendant lights are another great place to install a pulley system. Climbing and fishing are just some of the activities that utilize the pulley. They are great for fishing and gardening. And since they are so versatile, you can use the pulley system anywhere.
To get the most out of your pulley system, you must choose a product that has all of the above attributes. A high-quality pulley must have a large pulley diameter and be made of sturdy materials. The cables must also be properly supported in the pulleys to ensure a long service life for your investment. A good cable should have minimal cracks and be lubricated. These factors are the most important considerations when choosing a pulley system for your needs.

composite pulley

Composite pulley systems combine two or more movable pulleys. These systems maximize the force to move the weight and can also change direction so they can be used to lift weights. Composite pulley systems can be as simple or as complex as your needs. For example, a pulley pulley system uses multiple pulleys on each axis. This method is often used for hoisting building materials.
A compound pulley system has two or more rope segments, each of which is pulled up on a load. It can increase lift by making objects move faster. These systems are common on large sailboats and construction sites. Composite pulleys are also available for larger boats. Due to their versatility, they are versatile tools for construction sites and large sailboats. If you have their app, you should consider buying one.
The main advantage of composite pulleys is their versatility. You can use them to lift weights or use them to save energy. Composite pulleys are especially useful for lifting heavy objects. For example, you can tie a paper clip to the end of the rope and pull it up. The flag is then lifted into the air with the help of compound pulleys. Composite pulleys are a great invention and they are often used in construction.

security considerations

There are several safety considerations to consider when using pulleys. The first is Secure Workload (SWL). This value is a general guideline for the maximum weight a pulley can safely handle. It varies according to the height and angle of the pulley. Besides SWL, there are some other factors to consider. Consider each one before deciding on the pulley that best suits your needs.
Another safety consideration is the weight of the load. Since the highs of the pulley are higher than the lows, it doubles in weight. The weight of the high point should not exceed 4 kN. The safety factor is calculated by multiplying the strength of the pulley by the weight of the load. Secondary COD has a safety factor of 10:1 and bulletproof primary anchors should be used with pulleys.
If using a chain hoist, you must be trained in the appropriate type of lifting. It is important not to hang on the top hooks of the structure, nor to overload or rig the hooks with multiple slings. You should also avoid corroded or damaged chains, as they can cause the crane to jam or overload. A worn chain can even cause the load to drop.

Components of a pulley system

Proper design of the pulley system can increase the life of the cables and pulleys. Larger diameter cables should be selected as they are more durable than smaller diameter cables. The cables should also be supported in the pulley grooves. The pulley must be designed to be compatible with the cable and its lubrication should be optimal. Proper lubrication of cables and pulleys will ensure maximum durability and longevity.
The first type of pulley is called a fast pulley. These pulleys are used for quick start and stop of the machine. These pulleys are usually mounted in pairs on the countershaft of the machine. One pulley is tightly mounted on the machine shaft, while the other pulley is fitted with a free-spinning mechanism. When the machine is running, the belt is mounted on the tensioner pulley, and when it is stopped, the belt slides on the independent pulley.
Composite pulley sets reduce the overall effort required by reducing the size of the pulley. These are usually attributed to Archimedes. Flat pulleys are often used in flat belt driven transmission systems. These are used in high-speed, low-power applications. Flat pulley idlers are also used on the back of traditional V-belts.

China Standard 3V Series Cast Iron Eight-Groove Sheaves Pulley with Split Taper Bushings   pulley design	China Standard 3V Series Cast Iron Eight-Groove Sheaves Pulley with Split Taper Bushings   pulley design
editor by CX