Caterpillar 108-6428 bypass valve

Basic information

Brand: Caterpillar

The application scenario: is widely used in all types of mechanical engineering equipment, in the engine system and the Carter hydraulic system, for example, in the hydraulic system and fuel system of Carter excavators, bulldozers and other equipment.

Type of product

Spring valve of pressure discharge: to control the opening and closing of the valve, the elastic force of the spring is used. Когда давление в системе превышает заданное давление пружины, пружина сжимается и клапан открывается для сброса давления; After reducing the pressure, the spring returns to the original state and the valve closes.

The pneumatic valve of the pressure of pressure: is controlled by a gas source, when the pressure in the system is an abnormal, electromagnetic valve turns on, and the cylinder pushes the valve to open and drop the pressure; After the pressure comes back to normal, the electromagnetic valve is de -energized, and the cylinder returns the valve to a closed state.

Working parameters

The pressure range: the operating pressure range is wide, from low pressure to thousands of pounds per square inch, may comply with the requirements for pressure in various equipment systems.

The consumption coefficient: in accordance with various models, the flow rate in a certain range may guarantee that the pressure discharge can be quickly discharged in the appropriate environmental consumption in order to effectively reduce the pressure in the system.

The accuracy of opening pressure: usually can achieve a high degree of accuracy, as a rule, in the range of a given pressure for accurate opening.

Production process

The choice of material: the valve body is often made of high -strength cast iron, cast steel or stainless steel to ensure resistance to pressure and corrosion; The valve spool and other key parts are made of a special alloy to increase wear resistance and tightness.

The accuracy of processing: the use of precision processing technology to ensure the accuracy of the sizes of the components and surface decoration, so that the sealing characteristics of the valve and the reliability of the action are better.

The assembly process: Assembly is carried out in strict accordance with the assembly process and standards to guarantee that the components are installed in place after strict commissioning and testing to guarantee that the dumping of the pressure of the factory quality.

Details of spare parts of the Carter engine

1. The main components and spare parts

(I) piston node

Piston: usually made of high -strength aluminum alloy, has characteristics of lightweight and good thermal conductivity. It can effectively reduce the power of inertia during engine operation and improve fuel economy. The upper part of the piston can have a different shape, for example, flat, concave, convex, etc., depending on various models of engines and requirements for combustion of fuel to optimize the combustion process and increase the output power. For example, in some engines of Carter excavators with higher power requirements, a piston with a concave upper part is used, which allows you to increase the volume of combustion chamber, improve the compression degree and make combustion more complete.

Piston ring: divided into a gas ring and an oil ring. The gas ring is mainly made of alloy cast iron and goes through special surface processing processes, such as chromium and nitrogen, to increase its wear resistance and sealing, effective preventing gas leakage and ensuring the power characteristics of the engine. The oilfold ring is responsible for removing excess oil from the cylinder walls, preventing oil from entering the combustion chamber, reducing the oil consumption and the formation of soot. Its unique design allows you to maintain a good oil distribution, while ensuring the effect of sucking the oil, which guarantees the lubrication of the engine.

Piston finger: made of low -carbon alloy steel, is subjected to cementation and hardening. It has high surface hardness, strong wear resistance and good internal strength. It can withstand the pressure of the gas and the power of inertia transmitted by the piston, connect the piston and the connecting rod and provide stable power transmission.

(ii) crankshaft and connecting rod

Kolenous shaft: made of medium -carbon steel or mid -carbon alloyed steel method. The surface of the neck is subjected to high -frequency hardening or nitrogen to increase wear resistance and fatigue strength. Formation processing is used to eliminate the concentration of stresses. A taller rolls to increase structural strength. He converts the reciprocating linear movement of the piston into rotational movement, gives out torque for the engine and drives other auxiliary devices. Its structure includes the front end of the crankshaft, a connecting rod neck, a radical neck, a crookedwood, a balancing block and the rear flange of the crankshaft. Each part works together to ensure stable engine operation.

Shatun: made of high-quality alloy steel, the connecting rod body has a i-shaped cross section to reduce weight and inertia, while ensuring strength. The large end of the connecting rod is connected to the connecting rod of the crankshaft through the connecting rod bearing to ensure relative rotation; The smaller end of the connecting rod is connected to the piston through the piston finger to transmit the piston to the crankshaft. The high -precision processing technology and strict quality control ensure the accuracy of the mating with the crankshaft and guarantee the output power of the engine.

(III) cylinder block and cylinder head head

The cylinder block: as a assembly base for all engine parts, it is usually made of high -quality gray cast iron and has sufficient rigidity and strength to withstand the various loads that occur during the engine operation. The cylinder in the upper part directs the movement of the piston, and the box in the lower part supports the crankshaft. Its structural design and production process directly affect the reliability and durability of the engine. Different models of Carter engines have different designs and sizes of cylinders to comply with various working conditions.

Cylinders block head: installed on the top of the cylinder block, forms a combustion chamber along with a cylinder block. It is mainly made of aluminum alloy, which has low weight and good heat transfer. The head of the cylinder block is equipped with structures such as the inlet channel, the exhaust channel and the injector mounting holes. The inlet channel affects the smoothness of the inlet, the exhaust channel produces exhaust gases, and the installation holes of the injector determine the accuracy of the fuel injection. The reasonable design of the combustion chamber is jointly guaranteed by the cylinder block and the cylinder head head, which can improve the effectiveness of fuel combustion and improve the engine performance.

2. Spare parts for auxiliary systems

1. Fuel injection system

Injector: Being a key executive component, it sprays fuel under high pressure in the combustion chamber in the form of fog in accordance with the instructions of the engine control unit (ECU). The principle of its operation is to control the enable and off of the power of the electromagnetic valve of the injection through the ECU to achieve accurate control of the time and duration of the injection. Injector's injection accuracy and the reliability of the injector directly affect the combustion effect and performance of the engine. If there are problems such as blockage and dripping, this will lead to incomplete combustion of the mixture, which will lead to such malfunctions as insufficient power, increased fuel consumption and excessive emissions.

High pressure fuel pump: is responsible for transporting fuel from the fuel tank to the injector and provides sufficient pressure to spray fuel in the combustion chamber in the form of fog. It uses the improved plunger pump technology or the technology of the gear pump, and it is characterized by high output pressure and high -precision consumption, which ensures a stable fuel supply to the engine in various working conditions.

(II) Lubrication system

Oil pump: extracts oil from an oil pallet, escapes it and supplies to various parts of the engine that needs lubricant, such as crankshaft bearings, connecting rod bearings, camshaft bearings, etc. Usually a gear pump or rotary pump is usually used, which has characteristics that has characteristics compact design, reliable work and stable flow. It can provide sufficient oil pressure at various engine speeds in order to ensure the needs of the engine in grease.

Oil filter: filters impurities and metal particles from oil, preventing them from entering the engine lubrication system and leading to wear of parts. It uses a high -precision filter paper or a metal filter screen with high filtering efficiency, high dirtiness, good sealing and pressure resistance, which guarantees that the cleanliness of the filtered oil meets the requirements of the engine.

(III) cooling system

Water pump: forces the coolant to circulate in the engine, removing the heat released during the engine operation. Usually, a centrifugal water pump is used, which has the characteristics of a large consumption and high pressure. Its working wheel is driven by the crankshaft of the engine through the belt, and the speed is stable to ensure the effectiveness of coolant circulation.

Radiator: disperses heat absorbed in the coolant into the air, cooling it. It uses a highly effective material of aluminum alloy, and the radiator is designed in such a way as to increase the area of ​​heat dispersion and increase the efficiency of heat dispersion. At the same time, the radiator has a strong design, withstands a certain pressure and vibration, and also adapts to difficult working conditions.

3. Applicable models and areas of application

Spare parts for Caterpillar engines are widely used in various types of Caterpillar engineering equipment, such as excavators, loaders, bulldozers, taps, forklifts, etc. In the area of ​​excavators, for models such as Caterpillar 320 and 336D, various models of engine correspond to different combinations of spare parts; For loaders, spare parts of engines for models such as Caterpillar 950 provide stable operation of the equipment when performing heavy work. In addition, spare parts for Carter engines also play an important role in generator installations, ship power plants, industrial equipment, etc., ensuring the normal operation of equipment in various operating conditions.

4. Advantages of performance and quality guarantee

Advantages of operation: Spare parts for Carter engines use advanced design concepts and production processes that are ideal for Carter engines and effectively improve their power characteristics, fuel efficiency and reliability. For example, high -precision control of spare parts of the fuel injection system provides a more complete combustion of fuel and reduces its consumption; The optimized design of the piston group reduces engine wear and failure frequency.

Quality guarantee: strictly follow the quality standards and production processes of Caterpillar. From the purchase of raw materials to production and processing, quality testing, each link is strictly controlled. All spare parts have passed numerous tests of performance and reliability to guarantee long -term stable work in harsh working conditions, providing users with reliable protection during operation.