Anti-loosening structure for high-pressure connector of oil injector

Abstract

The utility model discloses an oil sprayer high-pressure connector anti-loose structure which comprises an oil sprayer and a high-pressure connector assembly, a connector threaded hole is formed in the upper right end of the oil sprayer, the high-pressure connector assembly comprises a high-pressure connecting pipe, a locking nut and a pressure spring, a hexagon bolt face is arranged on the upper portion of the high-pressure connecting pipe, and two sets of threads are arranged on the lower portion of the high-pressure connecting pipe. The two threads are respectively a first thread and a second thread, the first thread is connected with the joint threaded hole, the locking nut is arranged on the second thread, and the pressure spring is sleeved in the high-pressure connecting pipe and is arranged between the hexagon bolt surface and the locking nut. The oil injector structure solves the problem that according to an existing oil injector structure, due to the fact that an engine vibrates, a nut at the lower end is loosened, and oil leakage of an oil injector is caused.

Description

Technical Field

[0001] The utility model relates to the field of engines, in particular to an anti-loosening structure of a high-pressure joint of a fuel injector. Background Art

[0002] At present, the high-pressure joint of the fuel injector is directly screwed on the fuel injector interface, or made into an integrated structure. Since both ends of the high-pressure joint are threaded and the thread specifications are the same, when the nut at the upper end is loosened during the disassembly and assembly process, sometimes the thread at the lower end is loosened first, causing the fuel injector to leak. Especially for the fuel injector arranged in the cylinder head cover, the hexagonal nut of the high-pressure joint cannot be tightened with tools, resulting in inability to disassemble and assemble. At the same time, the existing structure has the risk of the nut at the lower end loosening due to the vibration of the engine, which causes the fuel injector to leak.

[0003] The disclosure of the above background technology content is only used to assist in understanding the utility model concept and technical solution of the utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Utility Model Content

[0004] The utility model aims to provide an anti-loosening structure for a high-pressure joint of a fuel injector, which solves the problem that the nut at the lower end of the existing fuel injector structure may become loose due to the vibration of the engine, thereby causing oil leakage of the fuel injector.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A fuel injector high-pressure joint anti-loosening structure, characterized in that it includes a fuel injector and a high-pressure joint assembly, the fuel injector is provided with a joint threaded hole at the upper right end, the high-pressure joint assembly includes a high-pressure connecting pipe, a locking nut and a pressure spring, the upper part of the high-pressure connecting pipe is provided with a hexagonal bolt surface, and the lower part is provided with two groups of threads, namely a first thread and a second thread, the first thread is connected to the joint threaded hole, the locking nut is installed on the second thread, and the pressure spring is inserted into the high-pressure connecting pipe and installed between the hexagonal bolt surface and the locking nut.

[0007] Furthermore, the high-pressure connecting pipe is connected to the connector threaded hole of the fuel injector by matching the first thread to connect the high-pressure connector assembly to the fuel injector.

[0008] Furthermore, the locking nut is a hexagonal nut.

[0009] Furthermore, the spring force value of the pressure spring is 10kgf / mm to 25kgf / mm.

[0010] Furthermore, a high-pressure quick connector is provided on the top of the high-pressure connecting pipe.

[0011] Compared with the prior art, the advantages and beneficial effects of the utility model are:

[0012] The utility model mainly consists of an injector and a high-pressure joint assembly. Two groups of threads are arranged on the high-pressure connecting pipe. The first thread is used to connect the injector. A locking nut is arranged on the second thread to increase the loosening torque at the connection between the connecting pipe and the injector end, so as to ensure that the high-pressure interface is not loosened during the disassembly and assembly process. At the same time, a pressure spring is arranged between the hexagonal bolt surface and the locking nut. The spring provides pressure to prevent the locking nut from loosening, so as to play a protective role. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the high-voltage connector assembly of the utility model. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with specific implementations. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0016] like Figure 1 and 2 As shown, the anti-loosening structure of the high-pressure joint of the injector is characterized in that it includes a fuel injector 1 and a high-pressure joint assembly 2, the upper right end of the fuel injector 1 is provided with a joint threaded hole 3, due to the installation of the high-pressure joint assembly 2, the high-pressure joint assembly 2 includes a high-pressure connecting pipe 4, a locking nut 5 and a pressure spring 6, the upper part of the high-pressure connecting pipe is provided with a hexagonal bolt surface 7, which is convenient for connecting and installing using tools, and the lower part is provided with two groups of threads, namely a first thread 8 and a second thread 9, the first thread 8 is connected to the joint threaded hole 3, and the high-pressure connecting pipe 4 is connected to the injector 1 through the first thread 8. The threaded holes 3 of the connector are matched to connect the high-pressure connector assembly 2 as a whole to the injector 1. The locking nut 5 is installed on the second thread 9 to lock the high-pressure connecting pipe 4. The pressure spring 6 is inserted into the high-pressure connecting pipe 4 and installed between the hexagonal bolt surface 7 and the locking nut 5. The spring force value of the pressure spring 6 is 10kgf / mm~25kgf / mm, which is used to provide a pressure to the locking nut 5 to prevent it from loosening; the locking nut 5 is a hexagonal nut, which is convenient for connecting and installing using tools; a high-pressure quick connector 10 is provided on the top of the high-pressure connecting pipe 4 to connect the high-pressure oil pipe.

[0017] The above contents are further detailed descriptions of the present invention in combination with specific / preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can also make several substitutions or modifications to the described embodiments without departing from the concept of the present invention, and these substitutions or modifications should be deemed to belong to the protection scope of the present invention.

Claims

1. A fuel injector high pressure joint anti-loosening structure, characterized by: It includes a fuel injector and a high-pressure joint assembly, wherein the fuel injector is provided with a joint threaded hole at the upper right end, and the high-pressure joint assembly includes a high-pressure connecting pipe, a locking nut and a pressure spring, the upper part of the high-pressure connecting pipe is provided with a hexagonal bolt surface, and the lower part is provided with two groups of threads, namely a first thread and a second thread, the first thread is connected to the joint threaded hole, the locking nut is installed on the second thread, and the pressure spring is inserted into the high-pressure connecting pipe and installed between the hexagonal bolt surface and the locking nut.

2. The anti-loosening structure of the high-pressure joint of the fuel injector according to claim 1, characterized in that: The high-pressure connecting pipe is connected to the connector threaded hole of the fuel injector by matching with the first thread to connect the high-pressure connector assembly to the fuel injector.

3. The anti-loosening structure of a high-pressure joint of a fuel injector according to claim 1, characterized in that: The locking nut is a hexagonal nut.

4. The anti-loosening structure of a high-pressure joint of a fuel injector according to claim 1, characterized in that: The spring force value of the pressure spring is 10kgf / mm to 25kgf / mm.

5. The anti-loosening structure of a high-pressure joint of a fuel injector according to claim 1, characterized in that: A high-pressure quick connector is provided on the top of the high-pressure connecting pipe.

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