Yunnan Xintianli Machinery Manufacturing Co.

Kunming, China

Yunnan Xintianli Machinery Manufacturing Co.

Kunming, China
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Lei J.,Kunming University of Science and Technology | Shen L.,Kunming University of Science and Technology | Chen Z.,Kunming University of Science and Technology | Bi Y.,Kunming University of Science and Technology | Chen J.,Yunnan Xintianli Machinery Manufacturing Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2011

According to the structural characteristics of new-type horizontal diesel engine, the cooling jacket of forced cooling closed-loop system was designed, the temperature and pressure of inlet position and key points of cooling jacket were measured and analyzed under different working conditions. Computational fluid dynamics (CFD) software was utilized to study the fluid flow and the flow field, the pressure field and heat transfer coefficient distribution were analyzed and optimized. The results indicated that the mean flow velocity, average heat transfer coefficient and whole pressure loss of the original cooling jacket were 1.00 m/s, 7767 W/(m2·K) and 0.027 MPa respectively. They met the requirements of engineering design. But the cooling water flow velocity and average heat transfer coefficient between two cylinder bore were non-uniform. There were big swirls in the central region in public cavity and the top region in the second cylinder block water jacket and dead flow region in the bridge of the nose area of the second cylinder head and the local area below two exhaust port. After optimization, the mean flow velocity and average heat transfer coefficient came up to 1.35 m/s and 9826 W/(m2·K), increased by 35% and 26.5% respectively than the original design. The mean flow velocity of cooling water came up to 1.33 m/s, increased by 41.5% and the average heat transfer coefficient was greater than 5000 W/(m2·K) in the bridge of the nose area of cylinder head. Compared to the original design, there was no dead flow region, no big swirls existed in new cooling jacket.


Lei J.-L.,Kunming University of Science and Technology | Shen L.-Z.,Kunming University of Science and Technology | Bi Y.-H.,Kunming University of Science and Technology | Jia D.-W.,Kunming University of Science and Technology | Chen J.-M.,Yunnan Xintianli Machinery Manufacturing Co.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2013

According to the structure features of off-road horizontal diesel engine, a gantry type cylinder block was developed independently on the basis of analyzing existing problems of tunnel type cylinder block. By combination with the free modal test, a finite element analysis model of cylinder block components was established and used to calculate and analyze structure stiffness and strength of the gantry type cylinder block. Results indicate that the new gantry type cylinder block of the horizontal diesel engine is of compact structure and light weight. It has short lubricating passage, high cooling efficiency and easy casting and machining processes. Its low-order natural frequency is higher and overall rigid is good, natural frequencies of all order modals are more than 500Hz. Under the three calculated preloading conditions, i.e. max. torque, 1st and 2nd cylinder combustion, the cylinder block does not show high stress concentration and large deformation situations, calculated safety factor is greater than 1.5. Its structural rigidity and strength meet actual use requirements for off-road diesel engine.


Lei J.-L.,Kunming University of Science and Technology | Shen L.-Z.,Kunming University of Science and Technology | Cheng D.-D.,Kunming University of Science and Technology | Bi Y.-H.,Kunming University of Science and Technology | Chen J.-M.,Yunnan Xintianli Machinery Manufacturing Co.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2012

Based on measurement of temperature filed of piston and cylinder liner, the dynamic model of piston set in model 2D25 diesel engine was established using AVL Excite Piston and Rings. On the basis the effects of radial clearance between piston and cylinder inner wall, convex position and ovality of piston skirt profile, offset of piston pin and piston head profile on the piston secondary motion were analyzed, and these structural parameters were optimized by using orthogonal experimental design. The results indicate that the piston knock energy and friction power loss are the mainly evaluation indicators of piston secondary motion and their effects are opposite each other. Of them, the radial clearance between piston and cylinder inner wall gives the greatest impact on the piston secondary motion, followed by the offset of piston pin, then the piston skirt ovality, the least is convex position of piston skirt profile. Piston head profile mainly affects piston knock energy, hardly affects the friction power loss.


Lei J.-L.,Kunming University of Science and Technology | Lei J.-L.,Chendu Galaxy Power Co. | Wen J.,Chendu Galaxy Power Co. | Song G.-F.,Yunnan Xintianli Machinery Manufacturing Co. | And 2 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2015

Based on the measurements of the temperature field of piston and cylinder sleeve, the dynamic model of 2D25 diesel piston assembly was established. The effect of piston structural parameters on lube-oil consumption was analyzed by orthogonal experimental design method and conventional method respectively. The results indicate that the radial clearance between piston skirt and cylinder inner wall is the greatest impact on the lube-oil consumption, then the piston head radial clearance and the piston pin offset. The convex position of piston skirt profile, and the stiffness and ovality of piston skirt have little impact on the oil consumption. The lube-oil consumption is independent from the radial clearance between piston skirt and inner wall within the range from 0.06 mm to 0.09 mm, but increases rapidly with the increase of the radial clearance between piston skirt and inner wall within the range from 0.09 mm to 0.15 mm. The lube-oil consumption has a little increment with an increase of the piston head radial clearance. The lube-oil consumption has the lowest value when the piston pin offset to main bearing surface is 0.5 mm, and increases with the increase of the piston pin offset but in a small range of variation. ©, 2015, Chinese Society for Internal Combustion Engines. All right reserved.

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