Split assembled internal single cylinder diesel rear cover breather

Abstract

The invention discloses a split assembled internal single cover diesel rear cover breather which comprises a rear cover plate, a gas discharging element and a breather body. The breather body is arranged in an inner cavity of the rear cover plate, the breather body and the gas discharging element are fixed to the rear cover plate in a sealed mode through detachable structures, the gas discharging end of the gas discharging element is arranged on the outer side of the rear cover plate, and a gas exchange cavity in the breather body is communicated with the outside through the gas discharging element. Meanwhile, the invention discloses several typical structures of the breather and installation methods of the breather, the defects of the prior art are overcome, the negative pressure value of the breather can stably reach the height of a 19.5 cm water column or higher, the structure of an internal rear cover breather part is simplified, the use stability and reliability of the breather are improved, a welding sealing structure in the prior art is eliminated, an existing welding fixing structure is replaced by a split assembling structure, part production is facilitated, assembling is also facilitated, the first pass yield of product production is increased, the production cost can also be greatly reduced, and the requirement for production technologies is lowered.

Description

Technical field: [0001] The invention relates to a single-cylinder water-cooled diesel engine, in particular to a rear cover respirator part of the single-cylinder water-cooled diesel engine. Background technique: [0002] The rear cover respirator parts are arranged on single-cylinder water-cooled diesel engines with a bore diameter of less than 95 mm. At present, there are two types of rear cover respirator parts. The first is an external structure, which consists of a rear cover plate, a breathing The breathing piece, the breathing piece limiting plate, the breathing piece cover with the exhaust pipe, and the oil shield are provided with air outlet holes on the rear cover, the breathing piece is set on the air outlet restraining side, and the breathing piece limiting plate is set on the breathing The outer side of the breathing piece, the breathing piece cover tightly covers the breathing piece and the limit plate of the breathing piece, the oil deflector is set on the in...

AI Technical Summary

Problems solved by technology

[0003] First, since the respirator is arranged on the outside of the rear cover, the exhaust elbow must be welded on the top surface of the breathing piece cover, and the welding around the exhaust elbow will inevitably cause deformation of the connecting surface, which directly affects the breathing piece cover. The sealing performance between the shell and the rear cover leads to oil leakage. According to statistics, the leakage rate here is more than 85%.

[0004] Second, the effect of negative pressure is not good. After testing, the limit value of negative pressure difference can only reach 10 centimeters of water column height, while the design value of the diesel engine should be greater than 15 centimeters of water column height, otherwise it will not only affect the lubrication of the diesel engine, but also affect the performance of the diesel engine. Power output, fuel consumption rate of diesel and engine oil consumption rate;

[0006] Fourth, the product structure is complex and the cost is high, and it is only suitable for use on R170A and R175A diesel engines, and cannot be used on diesel engines with a cylinder diameter greater than 80 mm

[0009] First, there are as many as 16 parts, the structure is complex, the technical requirements for assembly and sealing welding are high, and the cost of the product is high;

[0010] Second, although the negative pressure effect is better than that of the external structure, it only reaches a height of 12 to 13 centimeters of water column;

[0011] Third, when the diesel engine is in an oblique working state, the respirator will still inject fuel, and it will be more serious when the inclination angle exceeds 30 degrees;

[0012] Fourth, it is difficult to ensure the welding sealing between the exhaust elbow and the rear cover, and between the rear cover lining and the rear cover, especially when only a few welding points are passed between the rear cover lining and the rear cover. Then use adhesive glue to coat the butt joint, so that only a false temporary seal can be formed. After the diesel engine has been working for a certain period of time, the glue joint will gradually be vibrated and gaps will be formed under the condition of constant vibration, resulting in damage to the back cover lining. A sealed cavity is formed between it and the rear cover, which directly affects the negative pressure performance index of the diesel engine until the negative pressure effect is lost

[0013] From the comparison of the design requirements of the diesel engine and the actual use effect, it can be seen that the built-in type is better than the external type, but because the existing built-in structure has the above-mentioned many defects, the production cost remains high, and the reliability and stability of use are poor, making the diesel engine Manufacturers have to replace the built-in type with external type, resulting in worse and worse quality of diesel engines

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