The temperature of the diesel engine and the cooling water is high, and the over-temperature "opening" is one of the most frequent failures in the rack-and-rail vehicle, and many accidents such as the cylinder head rupture are caused.
The mechanical scaffolding car grasps the main contradiction. The wear-resistant hammer first adopts the automobile water tank with double the heat-dissipating area, and secondly, because there is no main hydraulic system, there is no hydraulic oil cooling box like the hydraulic car. The wear-resistant hammer head is arranged in front of the cooling fan in parallel with the cooling water cooling box, and the two boxes are heated together. In addition, the high-speed part of the locomotive has a clutch to achieve no-load idling of the diesel engine, so the temperature of the diesel engine and the cooling water can always be operated within the specified temperature. There has never been a "crowding" of the cooling water. The locomotive can be long under the rated load. Time running, the purpose of running Dora fast running.
Because the mechanical rack gear has no complicated high-pressure main hydraulic transmission system, it not only consumes the expensive anti-wear hydraulic oil, but also the oil leakage phenomenon is basically suppressed.
In addition, the external part of the diesel engine can achieve no-load idling due to high-speed clutch, and the temperature is not over-limit. Therefore, the total consumption of diesel oil and oil can be reduced by about 1/4. Furthermore, the five gearboxes of the locomotive are mostly in low-speed running state. Not high, the seal can be guaranteed, so the gear oil consumption is also very small.
Valves is one of the key components that affect engine reliability and safety. It's mainly used to start and shut down the intake and exhaust passages during engine operation, to control the intake of fuel mixture or air and the discharge of exhaust gases. . The working environment of the valve and Valve Seat is very harsh. In addition to the corrosion of high temperature gas, it also bears the impact of the burst pressure in the cylinder.
The material of the valve is usually divided into 40Cr, 4Cr9Si2, 4Cr10Si2Mo, 21-4N and 23-8N in China. 5Cr8Si2, 4Cr9Si3, 21-2N, 21-12N, 23-8N, XB, etc. have been used in large quantities on some imported models. High-temperature nickel-based alloys are also being used on high-load diesel exhaust valves.
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