Product Description

Small House Power 25HP 2WD Agricultural Tractor with Lowest Price

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

Technical Parameters

Production Workshop

Certificate

Business Partners

FAQ

Q1. How to ship the Tractors?
A:    By container, bulk ship, RORO.

Q2. Do you have different horsepower tractors?
A:   Yes,we supply different model tractors and exported to many countries.

Q3. What is your payment term?
A: We usually accept T/T or L/C depends on the quantity. 
     T/T, deposit in advance, and balance paid before delivery from factory.

Q4. Which model tractors do you supply?
A:  We supply all kinds of tractors such as walking tractors, wheel tractors etc,.

Q5. What is your terms of delivery?
A:    FOB, CIF.

Q6. How about your delivery time?
A:   Generally, it will take 35 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.

Q7. Do you test all your goods before delivery?
A:   Yes, we have 100% test before delivery

Q8: What can you guarantee to your business partner?
A:   Best price with good quality. We guarantee quality and after sale service to satisfy our business partners.

How to Calculate Stiffness, Centering Force, Wear and Fatigue Failure of Spline Couplings

There are various types of spline couplings. These couplings have several important properties. These properties are: Stiffness, Involute splines, Misalignment, Wear and fatigue failure. To understand how these characteristics relate to spline couplings, read this article. It will give you the necessary knowledge to determine which type of coupling best suits your needs. Keeping in mind that spline couplings are usually spherical in shape, they are made of steel.
splineshaft

Involute splines

An effective side interference condition minimizes gear misalignment. When 2 splines are coupled with no spline misalignment, the maximum tensile root stress shifts to the left by 5 mm. A linear lead variation, which results from multiple connections along the length of the spline contact, increases the effective clearance or interference by a given percentage. This type of misalignment is undesirable for coupling high-speed equipment.
Involute splines are often used in gearboxes. These splines transmit high torque, and are better able to distribute load among multiple teeth throughout the coupling circumference. The involute profile and lead errors are related to the spacing between spline teeth and keyways. For coupling applications, industry practices use splines with 25 to 50-percent of spline teeth engaged. This load distribution is more uniform than that of conventional single-key couplings.
To determine the optimal tooth engagement for an involved spline coupling, Xiangzhen Xue and colleagues used a computer model to simulate the stress applied to the splines. The results from this study showed that a “permissible” Ruiz parameter should be used in coupling. By predicting the amount of wear and tear on a crowned spline, the researchers could accurately predict how much damage the components will sustain during the coupling process.
There are several ways to determine the optimal pressure angle for an involute spline. Involute splines are commonly measured using a pressure angle of 30 degrees. Similar to gears, involute splines are typically tested through a measurement over pins. This involves inserting specific-sized wires between gear teeth and measuring the distance between them. This method can tell whether the gear has a proper tooth profile.
The spline system shown in Figure 1 illustrates a vibration model. This simulation allows the user to understand how involute splines are used in coupling. The vibration model shows 4 concentrated mass blocks that represent the prime mover, the internal spline, and the load. It is important to note that the meshing deformation function represents the forces acting on these 3 components.
splineshaft

Stiffness of coupling

The calculation of stiffness of a spline coupling involves the measurement of its tooth engagement. In the following, we analyze the stiffness of a spline coupling with various types of teeth using 2 different methods. Direct inversion and blockwise inversion both reduce CPU time for stiffness calculation. However, they require evaluation submatrices. Here, we discuss the differences between these 2 methods.
The analytical model for spline couplings is derived in the second section. In the third section, the calculation process is explained in detail. We then validate this model against the FE method. Finally, we discuss the influence of stiffness nonlinearity on the rotor dynamics. Finally, we discuss the advantages and disadvantages of each method. We present a simple yet effective method for estimating the lateral stiffness of spline couplings.
The numerical calculation of the spline coupling is based on the semi-analytical spline load distribution model. This method involves refined contact grids and updating the compliance matrix at each iteration. Hence, it consumes significant computational time. Further, it is difficult to apply this method to the dynamic analysis of a rotor. This method has its own limitations and should be used only when the spline coupling is fully investigated.
The meshing force is the force generated by a misaligned spline coupling. It is related to the spline thickness and the transmitting torque of the rotor. The meshing force is also related to the dynamic vibration displacement. The result obtained from the meshing force analysis is given in Figures 7, 8, and 9.
The analysis presented in this paper aims to investigate the stiffness of spline couplings with a misaligned spline. Although the results of previous studies were accurate, some issues remained. For example, the misalignment of the spline may cause contact damages. The aim of this article is to investigate the problems associated with misaligned spline couplings and propose an analytical approach for estimating the contact pressure in a spline connection. We also compare our results to those obtained by pure numerical approaches.

Misalignment

To determine the centering force, the effective pressure angle must be known. Using the effective pressure angle, the centering force is calculated based on the maximum axial and radial loads and updated Dudley misalignment factors. The centering force is the maximum axial force that can be transmitted by friction. Several published misalignment factors are also included in the calculation. A new method is presented in this paper that considers the cam effect in the normal force.
In this new method, the stiffness along the spline joint can be integrated to obtain a global stiffness that is applicable to torsional vibration analysis. The stiffness of bearings can also be calculated at given levels of misalignment, allowing for accurate estimation of bearing dimensions. It is advisable to check the stiffness of bearings at all times to ensure that they are properly sized and aligned.
A misalignment in a spline coupling can result in wear or even failure. This is caused by an incorrectly aligned pitch profile. This problem is often overlooked, as the teeth are in contact throughout the involute profile. This causes the load to not be evenly distributed along the contact line. Consequently, it is important to consider the effect of misalignment on the contact force on the teeth of the spline coupling.
The centre of the male spline in Figure 2 is superposed on the female spline. The alignment meshing distances are also identical. Hence, the meshing force curves will change according to the dynamic vibration displacement. It is necessary to know the parameters of a spline coupling before implementing it. In this paper, the model for misalignment is presented for spline couplings and the related parameters.
Using a self-made spline coupling test rig, the effects of misalignment on a spline coupling are studied. In contrast to the typical spline coupling, misalignment in a spline coupling causes fretting wear at a specific position on the tooth surface. This is a leading cause of failure in these types of couplings.
splineshaft

Wear and fatigue failure

The failure of a spline coupling due to wear and fatigue is determined by the first occurrence of tooth wear and shaft misalignment. Standard design methods do not account for wear damage and assess the fatigue life with big approximations. Experimental investigations have been conducted to assess wear and fatigue damage in spline couplings. The tests were conducted on a dedicated test rig and special device connected to a standard fatigue machine. The working parameters such as torque, misalignment angle, and axial distance have been varied in order to measure fatigue damage. Over dimensioning has also been assessed.
During fatigue and wear, mechanical sliding takes place between the external and internal splines and results in catastrophic failure. The lack of literature on the wear and fatigue of spline couplings in aero-engines may be due to the lack of data on the coupling’s application. Wear and fatigue failure in splines depends on a number of factors, including the material pair, geometry, and lubrication conditions.
The analysis of spline couplings shows that over-dimensioning is common and leads to different damages in the system. Some of the major damages are wear, fretting, corrosion, and teeth fatigue. Noise problems have also been observed in industrial settings. However, it is difficult to evaluate the contact behavior of spline couplings, and numerical simulations are often hampered by the use of specific codes and the boundary element method.
The failure of a spline gear coupling was caused by fatigue, and the fracture initiated at the bottom corner radius of the keyway. The keyway and splines had been overloaded beyond their yield strength, and significant yielding was observed in the spline gear teeth. A fracture ring of non-standard alloy steel exhibited a sharp corner radius, which was a significant stress raiser.
Several components were studied to determine their life span. These components include the spline shaft, the sealing bolt, and the graphite ring. Each of these components has its own set of design parameters. However, there are similarities in the distributions of these components. Wear and fatigue failure of spline couplings can be attributed to a combination of the 3 factors. A failure mode is often defined as a non-linear distribution of stresses and strains.

China Professional Small House Power 25HP 2WD Agricultural Tractor with Lowest Price     with Hot sellingChina Professional Small House Power 25HP 2WD Agricultural Tractor with Lowest Price     with Hot selling