A high-pressure injection pipe connection structure

Abstract

This utility model relates to a special structural design for a high-pressure injection pipe. A guide damping ring is added between the outer circle of the long nut and the mounting hole of the engine cover. The long nut is made of 45# steel or equivalent material, with an inner diameter of 10mm~45mm, an outer diameter of 14mm~50mm, and a height of 50mm~200mm. The guide damping ring is made of nylon or PTFE material, with a Shore hardness of 45°~65°, an inner diameter of 13mm~49mm, an outer diameter of 16mm~55mm, and a height of 5~50mm. The bottom of the inner circle of the damping ring is open to facilitate insertion into the outer circle of the long nut of the high-pressure pipe. Compared with the prior art, the positive effects of this utility model are that the guide damping ring can effectively control the gap between the outer circle of the long nut and the mounting hole of the engine cover, effectively avoiding the long nut causing the injector interface angle to deflect when torque is applied during the installation of the high-pressure pipe, improving the concentricity of the high-pressure oil pipe and the injector interface, and reducing the installation stress of the oil pipe; after the long nut is tightened, it is constrained by the engine cover through the damping ring, reducing the vibration of the long nut itself, thereby preventing the long nut from vibrating and loosening, which would lead to oil leakage.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure oil pipe connection technology, specifically a novel high-pressure injection pipe anti-vibration structure. Background Technology

[0002] In some diesel engines, the fuel injector interface is located inside the cylinder head cover, and the high-pressure injection pipe uses a long nut design for connection. In engines operating under harsh vibration conditions, the long nut itself often vibrates significantly, frequently causing misalignment between the fuel line and the cylinder head cover mounting hole during installation. When engine layout constraints prevent changes to the cylinder head cover design or the addition of clamps to restrain the fuel line, the challenge lies in resolving the interference between the outer diameter of the long nut and the cylinder head cover mounting hole, and improving the vibration resistance of the high-pressure injection pipe. Utility Model Content

[0003] The purpose of this invention is to overcome the problems of insufficient vibration resistance and poor installation process of existing high-pressure injection pipe long nuts that penetrate cylinders, and to provide a new type of high-pressure injection pipe long nut structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A special structural design for a high-pressure injection pipe includes a guide damping ring between the outer circle of a long nut and the mounting hole in the engine cover. The long nut is made of 45# steel or equivalent material, with an inner diameter of 10mm to 45mm, an outer diameter of 14mm to 50mm, and a height of 50mm to 200mm. The guide damping ring is made of nylon or PTFE material, with a Shore hardness of 45° to 65°, an inner diameter of 13mm to 49mm, an outer diameter of 16mm to 55mm, and a height of 5mm to 50mm. The bottom of the inner circle of the damping ring has a guide angle of 30° to 120° to facilitate insertion into the outer circle of the long nut of the high-pressure pipe.

[0006] The guide anti-vibration ring is tightened and fixed to the outer circle of the long nut on the high-pressure oil pipe.

[0007] Compared with the prior art, the positive effects of this utility model are:

[0008] The guide damping ring effectively controls the gap between the outer circle of the long nut and the mounting hole of the engine cover, effectively preventing the long nut from causing the injector interface angle to deflect when torque is applied during the installation of the high-pressure pipe. This improves the concentricity of the high-pressure oil pipe and the injector interface and reduces the installation stress of the oil pipe. After the long nut is tightened, it is constrained by the engine cover through the damping ring, reducing the vibration of the long nut itself, thereby preventing the long nut from vibrating and loosening, which could lead to oil leakage. Attached Figure Description

[0009] Figure 1 Half-section view of a long nut;

[0010] Figure 2 Half-section view of the flange vibration damping ring;

[0011] Figure 3 High-pressure injection pipe assembly;

[0012] Figure 4 A schematic diagram of the structure of this application;

[0013] The markings in the attached diagram are: 1 engine cover, 2 high-pressure injection pipe, 3 long nut, 4 guide shock absorber ring. Detailed Implementation

[0014] The following provides a specific embodiment of a high-pressure injection pipe structure according to this utility model.

[0015] Example 1

[0016] Please refer to the attached diagram. A high-pressure injection pipe structure is characterized by the addition of a guide damping ring to the outer circumference of a long nut. The outer circumference of the nut has an installation diameter of φ19mm, a height of 26mm, a hexagonal face diagonal distance of 22mm, and a total height of 119mm. The high-pressure injection pipe has an outer diameter of φ8mm and an extended length of 306mm. The guide damping ring is made of PTFE material, with a total height of 34mm, an inner diameter of φ18.5mm, an outer diameter of 23.6mm, a height of 13.5mm, and a 30° chamfer on the bottom surface of the cylinder.

[0017] The guide damping ring is tightened and fixed to the outer circle of the nut, and wrapped around the outer wall of the long nut.

[0018] When installing the high-pressure fuel line, first align the injector-side fuel line head with the conical surface of the matching component. Insert the damping ring into the cover mounting hole, and then screw the nut fully into the matching component's thread. On the other end of the fuel line, use the same method to pre-tighten the rail-side nut, then apply the specified torque to tighten it. The tightening sequence is: first the injector-side nut, then the rail-side nut. During installation, the guide damping ring effectively prevents the injector interface from deflecting when torque is applied to the tail end of the long nut, while ensuring the alignment of the long nut with the engine cover mounting hole. After the fuel line is installed, the long nut is in close contact with the engine cover via the damping ring. During service, even under significant vibration, the damping ring effectively restrains the long nut of the high-pressure fuel line, reducing the vibration of the long nut itself and preventing it from loosening due to vibration and causing oil leakage.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-pressure injection pipe connection structure, characterized in that, A guide damping ring is provided between the outer circle of the long nut and the mounting hole of the engine cover. The guide damping ring is made of nylon or PTFE material, with an inner diameter of 13mm~49mm, an outer diameter of 16mm~55mm, and a height of 5~50mm.

2. The high-pressure injection pipe connection structure as described in claim 1, characterized in that, The long nuts are made of 45# steel, with an inner diameter of 10mm~45mm, an outer diameter of 14mm~50mm, and a height of 50mm~200mm.

3. The high-pressure injection pipe connection structure as described in claim 1, characterized in that, The bottom of the inner circle of the shock-absorbing ring has a guide angle of 30°~120° to facilitate insertion into the outer circle of the high-pressure pipe long nut.

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