China supplier Small Mini Tractor House and Tractor Parts Diesel Engine 490 354 454 404 504 wholesaler

Product Description

Crown A series tractor, exquisite appearance, amphibious, adopting side transmission shifting systems with 9 forward gears and 3 reverse; equipped with high quality engine, more powerful, fast speed, more fuel-efficient, domestically leading in the similar tractors; widely meet the needs of ploughing, rotary tillage,transportation and irrigation.

SPECIFICATION  CROWN A SERIES 25-35hp
Model CFA254 CFA304 CFA354
Horse power 25 30 35
Engine Changfa 390
Fuel tank L 25
Type Amphibious tractor/Four-wheel drive
Specified traction kN 6.5
PTO power kW 15.6 18.8 21.9
Overall dimensions mm Length (With front ballast) 3206
Width (Without rear ballast) 1440
Height (To the top of exhaust pipe) 1980
Wheelbase (mm)  1595
Wheel tread mm Front wheel 1150, Optional1000
Rear wheel Stepped adjustment: 1035-1406 (1200 in common use)
Optional stepless adjustment: 1000-1530 (1200 in common use) 
The minimum ground clearance mm 310
Structure Mass kg 1571
Minimum using Mass kg 1220
Steering Circle radius m Unilateral braking 3.2
Unilateral braking 2.85

ZheJiang CZPT Agricultural Equipment Co.,Ltd, 1 of the 3 subsidiaries of Changfa Group, is a large agricultural equipment manufacturing enterprise engaged in research and development, production and sales of agricultural equipment. Its headquarter is located in No. 555, Xihu (West Lake) Dis.n East Road, Lijia town ,HangZhou city, ZheJiang province. The company has 8 divisions, 5 subsidiaries. It covers an area of over 130 hectares and has more than 4000 employees and over 500 technicians.
The company adheres to the development concept of “market-orientation” and “mainstream products transcending”, so the company focuses on the R&D of core technologies and basic theories. Now the company has independent design ability of tractor, harvester, rice transplanter, CZPT dryer, diesel engine with 4 cylinders and below. The company is now developing its product mufti-functionality and intelligence step by step. At present, the company has in total 203  patents in force, including 21 patents for invention.
As a comprehensive agricultural machinery manufacturing enterprise, “Bring up high-quality employees, produce high-quality products, create high level enterprise, and build up a well-known brand” is our business philosophy. Relying on a strong technical force and advanced technology, we have designed and produced a lot of high quality agricultural products at home and abroad including diesel engine, transplanter, tractor, crawler type combine harvester, wheeled type combine harvester, CZPT dryer, generator and implements etc..
Changfa  Agricultural Equipment Co.,Ltd adheres to the concept of “customer satisfaction comes first” and has set up a complete sales-service network system of more than 600  first-level dealers, over 2000 second-level dealers throughout large and medium-sized cities all around China, and of more than 1500 trained professional service staff (full-time and part-time). A complete, well-developed parts supply system and e-commerce platform has also been set up for a multi-faceted service.
Changfa has diversified distribution channel in domestic market and also has a long-term plan for overseas market distribution channel.10% of all CZPT products have been sold to over 60 countries across South America, Africa, Middle East and Southeast Asia.
The Party and country leaders have paid high attention to and have given high recognition on the rapid development of our company.  Premier Wen Jiabao and vice premier Li Keqiang visited CZPT in early 2009. Premier Wen deeply encouraged CZPT staff: ” China is the world’s most populous country, also the country with the largest population of farmers. The best agricultural machinery in the world should be produced in China. I hope, you can produce the best agricultural equipment here”.

 

How to Select a Worm Shaft and Gear For Your Project

You will learn about axial pitch PX and tooth parameters for a Worm Shaft 20 and Gear 22. Detailed information on these 2 components will help you select a suitable Worm Shaft. Read on to learn more….and get your hands on the most advanced gearbox ever created! Here are some tips for selecting a Worm Shaft and Gear for your project!…and a few things to keep in mind.
worm shaft

Gear 22

The tooth profile of Gear 22 on Worm Shaft 20 differs from that of a conventional gear. This is because the teeth of Gear 22 are concave, allowing for better interaction with the threads of the worm shaft 20. The worm’s lead angle causes the worm to self-lock, preventing reverse motion. However, this self-locking mechanism is not entirely dependable. Worm gears are used in numerous industrial applications, from elevators to fishing reels and automotive power steering.
The new gear is installed on a shaft that is secured in an oil seal. To install a new gear, you first need to remove the old gear. Next, you need to unscrew the 2 bolts that hold the gear onto the shaft. Next, you should remove the bearing carrier from the output shaft. Once the worm gear is removed, you need to unscrew the retaining ring. After that, install the bearing cones and the shaft spacer. Make sure that the shaft is tightened properly, but do not over-tighten the plug.
To prevent premature failures, use the right lubricant for the type of worm gear. A high viscosity oil is required for the sliding action of worm gears. In two-thirds of applications, lubricants were insufficient. If the worm is lightly loaded, a low-viscosity oil may be sufficient. Otherwise, a high-viscosity oil is necessary to keep the worm gears in good condition.
Another option is to vary the number of teeth around the gear 22 to reduce the output shaft’s speed. This can be done by setting a specific ratio (for example, 5 or 10 times the motor’s speed) and modifying the worm’s dedendum accordingly. This process will reduce the output shaft’s speed to the desired level. The worm’s dedendum should be adapted to the desired axial pitch.

Worm Shaft 20

When selecting a worm gear, consider the following things to consider. These are high-performance, low-noise gears. They are durable, low-temperature, and long-lasting. Worm gears are widely used in numerous industries and have numerous benefits. Listed below are just some of their benefits. Read on for more information. Worm gears can be difficult to maintain, but with proper maintenance, they can be very reliable.
The worm shaft is configured to be supported in a frame 24. The size of the frame 24 is determined by the center distance between the worm shaft 20 and the output shaft 16. The worm shaft and gear 22 may not come in contact or interfere with 1 another if they are not configured properly. For these reasons, proper assembly is essential. However, if the worm shaft 20 is not properly installed, the assembly will not function.
Another important consideration is the worm material. Some worm gears have brass wheels, which may cause corrosion in the worm. In addition, sulfur-phosphorous EP gear oil activates on the brass wheel. These materials can cause significant loss of load surface. Worm gears should be installed with high-quality lubricant to prevent these problems. There is also a need to choose a material that is high-viscosity and has low friction.
Speed reducers can include many different worm shafts, and each speed reducer will require different ratios. In this case, the speed reducer manufacturer can provide different worm shafts with different thread patterns. The different thread patterns will correspond to different gear ratios. Regardless of the gear ratio, each worm shaft is manufactured from a blank with the desired thread. It will not be difficult to find 1 that fits your needs.
worm shaft

Gear 22’s axial pitch PX

The axial pitch of a worm gear is calculated by using the nominal center distance and the Addendum Factor, a constant. The Center Distance is the distance from the center of the gear to the worm wheel. The worm wheel pitch is also called the worm pitch. Both the dimension and the pitch diameter are taken into consideration when calculating the axial pitch PX for a Gear 22.
The axial pitch, or lead angle, of a worm gear determines how effective it is. The higher the lead angle, the less efficient the gear. Lead angles are directly related to the worm gear’s load capacity. In particular, the angle of the lead is proportional to the length of the stress area on the worm wheel teeth. A worm gear’s load capacity is directly proportional to the amount of root bending stress introduced by cantilever action. A worm with a lead angle of g is almost identical to a helical gear with a helix angle of 90 deg.
In the present invention, an improved method of manufacturing worm shafts is described. The method entails determining the desired axial pitch PX for each reduction ratio and frame size. The axial pitch is established by a method of manufacturing a worm shaft that has a thread that corresponds to the desired gear ratio. A gear is a rotating assembly of parts that are made up of teeth and a worm.
In addition to the axial pitch, a worm gear’s shaft can also be made from different materials. The material used for the gear’s worms is an important consideration in its selection. Worm gears are usually made of steel, which is stronger and corrosion-resistant than other materials. They also require lubrication and may have ground teeth to reduce friction. In addition, worm gears are often quieter than other gears.

Gear 22’s tooth parameters

A study of Gear 22’s tooth parameters revealed that the worm shaft’s deflection depends on various factors. The parameters of the worm gear were varied to account for the worm gear size, pressure angle, and size factor. In addition, the number of worm threads was changed. These parameters are varied based on the ISO/TS 14521 reference gear. This study validates the developed numerical calculation model using experimental results from Lutz and FEM calculations of worm gear shafts.
Using the results from the Lutz test, we can obtain the deflection of the worm shaft using the calculation method of ISO/TS 14521 and DIN 3996. The calculation of the bending diameter of a worm shaft according to the formulas given in AGMA 6022 and DIN 3996 show a good correlation with test results. However, the calculation of the worm shaft using the root diameter of the worm uses a different parameter to calculate the equivalent bending diameter.
The bending stiffness of a worm shaft is calculated through a finite element model (FEM). Using a FEM simulation, the deflection of a worm shaft can be calculated from its toothing parameters. The deflection can be considered for a complete gearbox system as stiffness of the worm toothing is considered. And finally, based on this study, a correction factor is developed.
For an ideal worm gear, the number of thread starts is proportional to the size of the worm. The worm’s diameter and toothing factor are calculated from Equation 9, which is a formula for the worm gear’s root inertia. The distance between the main axes and the worm shaft is determined by Equation 14.
worm shaft

Gear 22’s deflection

To study the effect of toothing parameters on the deflection of a worm shaft, we used a finite element method. The parameters considered are tooth height, pressure angle, size factor, and number of worm threads. Each of these parameters has a different influence on worm shaft bending. Table 1 shows the parameter variations for a reference gear (Gear 22) and a different toothing model. The worm gear size and number of threads determine the deflection of the worm shaft.
The calculation method of ISO/TS 14521 is based on the boundary conditions of the Lutz test setup. This method calculates the deflection of the worm shaft using the finite element method. The experimentally measured shafts were compared to the simulation results. The test results and the correction factor were compared to verify that the calculated deflection is comparable to the measured deflection.
The FEM analysis indicates the effect of tooth parameters on worm shaft bending. Gear 22’s deflection on Worm Shaft can be explained by the ratio of tooth force to mass. The ratio of worm tooth force to mass determines the torque. The ratio between the 2 parameters is the rotational speed. The ratio of worm gear tooth forces to worm shaft mass determines the deflection of worm gears. The deflection of a worm gear has an impact on worm shaft bending capacity, efficiency, and NVH. The continuous development of power density has been achieved through advancements in bronze materials, lubricants, and manufacturing quality.
The main axes of moment of inertia are indicated with the letters A-N. The three-dimensional graphs are identical for the seven-threaded and one-threaded worms. The diagrams also show the axial profiles of each gear. In addition, the main axes of moment of inertia are indicated by a white cross.

China supplier Small Mini Tractor House and Tractor Parts Diesel Engine 490 354 454 404 504     wholesaler China supplier Small Mini Tractor House and Tractor Parts Diesel Engine 490 354 454 404 504     wholesaler