Sealing structure of end cover of fuel injection pump

Abstract

A sealing structure of a fuel injection pump end cover comprises a pump body and an end cover, the periphery of the end cover is installed on the pump body through screws, a shaft hole is machined in the pump body, a first sealing groove is machined in the periphery of the shaft hole, a sealing piece is arranged in the first sealing groove, pressing faces are machined on the two sides of the sealing piece, and a compression hole is machined in the middle of the sealing piece. A sealing face is machined on the outer ring of the sealing piece, a second sealing groove corresponding to the first sealing groove is machined in the surface of the end cover, and pressing heads are evenly distributed in the second sealing groove and press the pressing face of the sealing piece. Compared with the prior art, according to the sealing structure of the end cover of the fuel injection pump, the sealing piece is arranged in the sealing groove to enable the end cover and the pump body to be sealed, the sealing groove is formed together when the pump body and the end cover are cast, and machining cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of fuel injection pump technology, specifically to a sealing structure for a fuel injection pump end cover. Background Technology

[0002] An end cover is installed on the end face of the fuel injection pump body, and the end cover is sealed to the pump body by a sealing ring, such as... Figure 3 As shown, a boss is machined around the shaft hole in the middle of the end cover. A sealing ring 100 is connected to the outside of the boss. The sealing ring 100 seals with the pump body. In order to achieve the sealing requirements, the external dimensions of the boss need to be guaranteed. If the external dimensions are too large, the sealing ring may not be able to be installed into the pump body. If the external dimensions are too small, the sealing may be poor. Therefore, the area around the boss needs to be precision milled. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a sealing structure for the end cover of a fuel injection pump, which addresses the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A sealing structure for an injection pump end cover includes a pump body and an end cover. The end cover is mounted on the pump body by screws around its periphery. The pump body has a shaft hole machined on it, and a first sealing groove is machined around the shaft hole. A sealing element is disposed in the first sealing groove. The sealing element has pressing surfaces machined on both sides and a compression hole machined in the middle. The outer ring of the sealing element has a sealing surface. The surface of the end cover has a second sealing groove machined corresponding to the first sealing groove. Pressing heads are evenly distributed in the second sealing groove, and the pressing heads press against the pressing surfaces of the sealing element.

[0006] Furthermore, the side of the seal is machined with a "W"-shaped sealing surface.

[0007] Furthermore, an installation ring is placed in the second sealing groove, and a stud is provided on the installation ring. The clamping head is screwed onto the stud.

[0008] Furthermore, the first sealing groove on the pump body and the second sealing groove on the end cover are formed during casting.

[0009] Furthermore, a positioning pin is connected to each of the upper and lower ends of the end cover, and a positioning pin hole is machined on the end face of the pump body.

[0010] Compared with the prior art, the sealing structure of the fuel injection pump end cover of this utility model has a sealing element set in the sealing groove to seal the end cover with the pump body. The sealing groove is formed together when the pump body and the end cover are cast, which saves processing costs. Attached Figure Description

[0011] Figure 1This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 This is a schematic diagram of the original end cover and pump body installation structure;

[0014] The components are: 1. Pump body, 2. End cover, 3. Positioning pin, 4. First sealing groove, 5. Seal, 6. Compression hole, 7. Second sealing groove, 8. Pressing head, 9. Mounting ring, 10. Stud. Detailed Implementation

[0015] The technical solutions in the embodiments of this utility model will be clearly and completely described below.

[0016] like Figure 1 and Figure 2 As shown, a sealing structure for an injection pump end cover includes a pump body 1 and an end cover 2. The end cover 2 is mounted on the pump body 1 with screws around its periphery. A positioning pin 3 is connected to the top and bottom of the end cover 2. A positioning pin hole is machined on the end face of the pump body 1. The positioning pin 3 is inserted into the positioning pin hole to enable quick positioning and installation between the end cover 2 and the pump body 1. A shaft hole is machined on the pump body 1. A first sealing groove 4 is machined around the shaft hole. A sealing element 5 is provided in the first sealing groove 4. A pressing surface is machined on both sides of the sealing element 5. A compression hole 6 is machined in the middle of the sealing element. A sealing surface is machined on the outer ring of the sealing element 5. A second sealing groove 7 is machined on the surface of the end cover 2 corresponding to the first sealing groove 4. Pressing heads 8 are evenly distributed in the second sealing groove 7. The pressing heads 8 can be extended and adjusted. The pressing heads 8 press the pressing surface of the sealing element 5, causing the compression hole 6 to be compressed under force, thereby causing the sealing surface on the outer side of the sealing element 5 to expand and seal the joint between the end cover 2 and the pump body 1.

[0017] In this embodiment, the first sealing groove 4 on the pump body 1 is formed simultaneously during the pump body casting process, and the second sealing groove 7 on the end cover 2 is formed simultaneously during the end cover 2 casting process. This eliminates the need for machining the side of the boss, thus saving machining costs.

[0018] In this embodiment, an installation ring 9 is placed in the second sealing groove 7, and a stud 10 is provided on the installation ring 9. The clamping head 8 is screwed onto the stud 10. The side of the sealing element 5 is machined with a "W"-shaped sealing surface. After adjusting the extension distance of the clamping head 8, the installation ring 9 is placed into the second sealing groove 7. The clamping head 8 presses against the clamping surface of the sealing element 5, causing the middle of the "W"-shaped sealing surface to expand and deform, sealing the joint between the end cover 2 and the pump body 1.

[0019] This utility model is not limited to the embodiments described. Those skilled in the art can still make some modifications or changes without departing from the spirit and scope of this utility model. Therefore, the scope of protection of this utility model shall be determined by the scope defined in the claims.

Claims

1. A sealing structure of an oil injection pump end cover, comprising a pump body and an end cover, the periphery of the end cover being mounted on the pump body by means of a screw, characterized in that: The pump body is provided with a shaft hole, and a first sealing groove is formed around the shaft hole. A sealing element is arranged in the first sealing groove. Two pressing surfaces are formed on both sides of the sealing element. A compression hole is formed in the middle of the sealing element. A sealing surface is formed on the outer ring of the sealing element. The surface of the end cover is provided with a second sealing groove corresponding to the first sealing groove. The second sealing groove is uniformly provided with a pressing head which presses the pressing surface of the sealing element.

2. The sealing structure of an oil injection pump end cover according to claim 1, characterized in that: The side surface of the sealing element is provided with a "W"-shaped sealing surface.

3. The sealing structure of an oil injection pump end cover according to claim 1, characterized in that: An installation ring is placed in the second sealing groove. The installation ring is provided with a stud. The pressing head is screwed on the stud.

4. The sealing structure of an oil injection pump end cover according to claim 1, characterized in that: The first sealing groove on the pump body and the second sealing groove on the end cover are formed during casting.

5. The sealing structure of an oil injection pump end cover according to claim 1, characterized in that: A positioning pin is connected to the upper and lower surfaces of the end cover. A positioning pin hole is formed on the end surface of the pump body.

Images