CN201250678Y - Injection pipe of diesel engine cooling jet - Google Patents

Abstract

The utility model discloses an injection pipe for cooling nozzles of diesel engines. The variable diameter part of the injection pipe is in the shape of smooth and continuous necking, so the inner wall transitions smoothly without turning lines, and the resistance when lubricating oil circulates is small, and the internal metal microstructure is not damaged, and the plasticity is excellent. Good roundness when bending and deforming, no cracking, etc., and the small end of the injection pipe is reamed to maintain sharp edges, so that the divergence is reduced when the injection pipe injects oil, and the piston of the internal combustion engine in the internal cooling oil passage is fully cooled and lubricated.

Description

Diesel engine cooling nozzle injection pipe

technical field

The utility model relates to a lubricating oil injection pipe for an internal cooling oil channel of an internal combustion engine.

Background technique

At present, the lubricating oil injection pipe of the internal combustion engine generally adopts a thick-walled pipe turning into an injection pipe without a variable diameter pipe, as shown in Figure 1 and Figure 2. The injection pipe processed by this method has a small amount of injection oil, and the injection oil diverges greatly, which is only suitable for the injection of lubricating oil in the external cooling oil passage, and greatly reduces the service life of the internal combustion engine in the internal cooling oil passage.

The injection tube adopts the process of turning the thick-walled tube into a variable-diameter tube. The manufacturing method is complicated, and a special tapered tool is required to process the variable-diameter part of the inner hole. The processing is easy to cause internal steps or penetration, and because of After processing, the pipe wall pattern makes the injection pipe easy to crack or ellipticity ≥ 10% when bending, as shown in Fig. 3, Fig. 4 and Fig. 5. The injection tube processed by this method has a large surface roughness due to the machining inside the tube. If the roughness of the inner wall is reduced, the processing cost is high and the processing is very difficult. The injection characteristics of lubricating oil require that the inner wall of the injection pipe be smooth and uniform in diameter, so as to reduce the adhesion of the inner wall of the lubricating oil and reduce the formation of eddy currents.

However, ordinary diameter reduction processing (such as rotary compression diameter reduction, electromagnetic diameter reduction), due to the compression and deformation behavior of the blank in the circumferential direction, instability and wrinkling are prone to occur during the deformation process, which makes the subsequent forming process impossible. Restricted, and this method of diameter reduction is generally suitable for the processing of large-diameter pipes. This method is used on thin-walled thin pipes, which will easily cause the port of the diameter reduction pipe to become thinner and crack, causing the injection pipe to spray oil and diverge.

Utility model content

The technical problem to be solved by the utility model is to provide a diesel engine cooling nozzle injection pipe with large injection oil volume and small injection oil divergence.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is: the diesel engine cooling nozzle injection pipe, including the injection pipe body, the injection pipe body is provided with an oil injection channel, and the oil injection pipe end of the oil injection channel is smooth and continuous Necked.

As an improvement, the end edge of the reduced-diameter fuel injection pipe is a sharp edge.

Due to the adoption of the above-mentioned technical scheme, the diameter-changing part of the injection pipe of the utility model is smooth and continuously necked, so the inner wall transition is smooth, without turning lines, the resistance when the lubricating oil circulates is small, and the internal metal microstructure is not damaged, and the plasticity is good and the bending deformation is good. It has the advantages of good roundness, no cracking, etc., and the small end of the injection pipe is reamed to maintain a sharp edge, so that the divergence is reduced when the injection pipe sprays oil, and the piston of the internal combustion engine in the internal cooling oil passage is fully cooled and lubricated.

Description of drawings

Fig. 1 is the pipe material of common internal combustion engine injection pipe;

Figure 2 is a commonly used internal combustion engine injection pipe;

Fig. 3 is the schematic diagram of the nozzle processing of domestic machining variable-diameter internal combustion engine oil injection pipe;

Fig. 4 is domestic machining variable diameter internal combustion engine oil injection pipe;

Fig. 5 is A-A to sectional view among Fig. 4;

Fig. 6 is a schematic diagram of the nozzle processing of the internal combustion engine oil injection pipe of the present embodiment;

Fig. 7 is the structural representation of present embodiment;

Fig. 8 is a sectional view taken along line A-A in Fig. 7 .

Detailed ways

As shown in Fig. 6, Fig. 7 and Fig. 8, the injection pipe of the cooling nozzle of the diesel engine includes the injection pipe body 3, and the fuel injection channel is arranged in the said injection pipe body, and the fuel injection pipe end 31 of the said oil injection channel is smooth and continuous. Necked. Wherein, the edge of the reduced-diameter fuel injection pipe end 31 is a sharp edge.

The utility model uses thin-wall thin tubes to be clamped once, and the necking is formed multiple times, and the remaining material is removed by machining. The deformed part inside the tube does not need secondary processing, the necking is formed naturally, and it is formed by one stamping and bending. Due to the good plasticity of the thin-walled tube, the deformation is small during bending, and the roundness is greater than 92%.

Compared with the nozzle without variable diameter, the spray pipe produced by the utility model can increase the amount of oil sprayed by the nozzle to the piston hole by 40-50%, and the processing procedure is simple and the cost is low.

Claims (2)

1. Diesel engine cooling nozzle injection pipe, including injection pipe body (3), said injection pipe body is provided with fuel injection passage, characterized in that: the fuel injection pipe end (31) of said fuel injection passage is smooth and continuously necked shape. 2. The diesel engine cooling nozzle injection pipe according to claim 1, characterized in that: the edge of the reduced-diameter fuel injection pipe end (31) is a sharp edge.

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