Product Description

China 25hp 4wd small farm tractors

Product features
Advantages and Characteristics of this series tractor:

Power: 25hp to 35hp
Engine: CZPT 3/ 4 cylinder diesel engine
Drive type: 2 / 4 wheel drive
Steering type: Hydraulic power steering
Clutch: Dual function clutch
Transmission type: F8+R2 collar shift gear or F16+R4 creeper gears
Instrument panel: Combined instrument panel or seperated instrument panel
Linkage: Category 1 rear-mounted 3-point linkage
Lifter: Draft and Positional adjustable
Front tyre: 6.00-16 Rear tyre: 9.5-24 (big tyre for optional)

Optional Devices

Cabin
Roll bar
Sun-shade
Front ballast(8pcs)
Air brake
Multi-way valve
Heater
Combination instrument

Features of HH254 25hp small farm tractor.
A). HH254 25hp small farm tractor with the characteristics of compact structure, mini size, reasonable power, various function, easy operation, reliable performance and environment protected, it is a right tractor for family and farm for agriculture and gardening.

B). HH254 25hp small farm tractor with front loader and back hoe, this series tractor can do various kind of job engineering

C). HH254 25hp small farm tractor with the fluid driving on whole structure, it has characteristics as compact structure and agile operation, which leads it work freely in incommodious field where large machine can not achieve.

D). HH254 25hp small farm tractor the working implements are connected with tractor in quick linkage type, and hydraulic pipes are connected by quick coupling, which are easy for assembly.

E). HH254 25hp small farm tractor the tractor hydraulic system affords power to front loader, back hoe and tractor lift equipments. Hydraulic oil tank is designed according to the international standard, which is easy for maintenance.

Remark:
The hp we can supply is 25-145hp, if you need 1 of them, please contact with us.

Technical parameter for 25hp 4wd tractor

Basic configuration 
Model HH-250/254
Dimensions Length×Width×Height(mm) 3200×1500×1880
Wheel Tread(mm) Front Wheel(mm) 1065
Rear  Wheel(mm) 1200
Min.Ground Clearance(mm) 265(4WD)     330(2WD)
Dry Mass Complete tractor weight(KG) 1330(4WD)    1100(2WD)
Engine Trade Mark or Brand XIHU (WEST LAKE) DIS.HU (WEST LAKE) DIS.
Engine Model Vertical Water Cooled 3-stroke
Directly Injection
Number of Cylinder 3
Cooling System Type Water Cooled
Rated Power(kw) 18.4KW
Fuel Tank Volume(L) 41.3
Transmission System Clutch Single,Dry,Single Stage Type
Gear Box F8+R2
Differential Closed 4-planetary Gears
Differential Lock Mechanical Sliding Sleeve
Braking System Mechanical,dry type  
Running System Tyre Model F/R(2WD) 5.5_16/9.5_24
F/R(4WD) 6.0_16/9.5_24
Steering System Mechanical for 2wd tractor, and Hydraulic steering for 4wd tractor
Working Device Hydraulic System Type Partial seperated lifter
Linkage Type I Rear Mount 3-point Linkage
PTO(Standard) Φ35×6
PTO Speed(r/min) 720
Drawbar Type Fixed Drawbar
Optional configuration 
Cab with Heater Cab with AC ROPS Sunvisor
Adjustable Comfort Seat Multiple Unit Valve Hydraulic steering for 2WD Dual-stage clutch
Double PTO Speed(r/min):  540/720   540/1000  720/1000
Bob-weight Frontballest 6×10=60kg  10kg/pcs  
Rearballast  2×25=50kg  25kg/pcs

The Benefits of Spline Couplings for Disc Brake Mounting Interfaces

Spline couplings are commonly used for securing disc brake mounting interfaces. Spline couplings are often used in high-performance vehicles, aeronautics, and many other applications. However, the mechanical benefits of splines are not immediately obvious. Listed below are the benefits of spline couplings. We’ll discuss what these advantages mean for you. Read on to discover how these couplings work.

Disc brake mounting interfaces are splined

There are 2 common disc brake mounting interfaces – splined and six-bolt. Splined rotors fit on splined hubs; six-bolt rotors will need an adapter to fit on six-bolt hubs. The six-bolt method is easier to maintain and may be preferred by many cyclists. If you’re thinking of installing a disc brake system, it is important to know how to choose the right splined and center lock interfaces.
splineshaft

Aerospace applications

The splines used for spline coupling in aircraft are highly complex. While some previous researches have addressed the design of splines, few publications have tackled the problem of misaligned spline coupling. Nevertheless, the accurate results we obtained were obtained using dedicated simulation tools, which are not commercially available. Nevertheless, such tools can provide a useful reference for our approach. It would be beneficial if designers could use simple tools for evaluating contact pressure peaks. Our analytical approach makes it possible to find answers to such questions.
The design of a spline coupling for aerospace applications must be accurate to minimize weight and prevent failure mechanisms. In addition to weight reduction, it is necessary to minimize fretting fatigue. The pressure distribution on the spline coupling teeth is a significant factor in determining its fretting fatigue. Therefore, we use analytical and experimental methods to examine the contact pressure distribution in the axial direction of spline couplings.
The teeth of a spline coupling can be categorized by the type of engagement they provide. This study investigates the position of resultant contact forces in the teeth of a spline coupling when applied to pitch diameter. Using FEM models, numerical results are generated for nominal and parallel offset misalignments. The axial tooth profile determines the behavior of the coupling component and its ability to resist wear. Angular misalignment is also a concern, causing misalignment.
In order to assess wear damage of a spline coupling, we must take into consideration the impact of fretting on the components. This wear is caused by relative motion between the teeth that engage them. The misalignment may be caused by vibrations, cyclical tooth deflection, or angular misalignment. The result of this analysis may help designers improve their spline coupling designs and develop improved performance.
CZPT polyimide, an abrasion-resistant polymer, is a popular choice for high-temperature spline couplings. This material reduces friction and wear, provides a low friction surface, and has a low wear rate. Furthermore, it offers up to 50 times the life of metal on metal spline connections. For these reasons, it is important to choose the right material for your spline coupling.
splineshaft

High-performance vehicles

A spline coupler is a device used to connect splined shafts. A typical spline coupler resembles a short pipe with splines on either end. There are 2 basic types of spline coupling: single and dual spline. One type attaches to a drive shaft, while the other attaches to the gearbox. While spline couplings are typically used in racing, they’re also used for performance problems.
The key challenge in spline couplings is to determine the optimal dimension of spline joints. This is difficult because no commercial codes allow the simulation of misaligned joints, which can destroy components. This article presents analytical approaches to estimating contact pressures in spline connections. The results are comparable with numerical approaches but require special codes to accurately model the coupling operation. This research highlights several important issues and aims to make the application of spline couplings in high-performance vehicles easier.
The stiffness of spline assemblies can be calculated using tooth-like structures. Such splines can be incorporated into the spline joint to produce global stiffness for torsional vibration analysis. Bearing reactions are calculated for a certain level of misalignment. This information can be used to design bearing dimensions and correct misalignment. There are 3 types of spline couplings.
Major diameter fit splines are made with tightly controlled outside diameters. This close fit provides concentricity transfer from the male to the female spline. The teeth of the male spline usually have chamfered tips and clearance with fillet radii. These splines are often manufactured from billet steel or aluminum. These materials are renowned for their strength and uniform grain created by the forging process. ANSI and DIN design manuals define classes of fit.
splineshaft

Disc brake mounting interfaces

A spline coupling for disc brake mounting interfaces is a type of hub-to-brake-disc mount. It is a highly durable coupling mechanism that reduces heat transfer from the disc to the axle hub. The mounting arrangement also isolates the axle hub from direct contact with the disc. It is also designed to minimize the amount of vehicle downtime and maintenance required to maintain proper alignment.
Disc brakes typically have substantial metal-to-metal contact with axle hub splines. The discs are held in place on the hub by intermediate inserts. This metal-to-metal contact also aids in the transfer of brake heat from the brake disc to the axle hub. Spline coupling for disc brake mounting interfaces comprises a mounting ring that is either a threaded or non-threaded spline.
During drag brake experiments, perforated friction blocks filled with various additive materials are introduced. The materials included include Cu-based powder metallurgy material, a composite material, and a Mn-Cu damping alloy. The filling material affects the braking interface’s wear behavior and friction-induced vibration characteristics. Different filling materials produce different types of wear debris and have different wear evolutions. They also differ in their surface morphology.
Disc brake couplings are usually made of 2 different types. The plain and HD versions are interchangeable. The plain version is the simplest to install, while the HD version has multiple components. The two-piece couplings are often installed at the same time, but with different mounting interfaces. You should make sure to purchase the appropriate coupling for your vehicle. These interfaces are a vital component of your vehicle and must be installed correctly for proper operation.
Disc brakes use disc-to-hub elements that help locate the forces and displace them to the rim. These elements are typically made of stainless steel, which increases the cost of manufacturing the disc brake mounting interface. Despite their benefits, however, the high braking force loads they endure are hard on the materials. Moreover, excessive heat transferred to the intermediate elements can adversely affect the fatigue life and long-term strength of the brake system.

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