Positioning pin structure of fuel injection pump driving shaft

Abstract

The utility model discloses a fuel injection pump drive shaft locating pin structure which comprises a drive main shaft and a locating pin, a balancing weight is arranged in the middle of the drive main shaft, a gear shaft, a first supporting shaft and an eccentric shaft are sequentially arranged at the left end of the balancing weight from left to right, and a second supporting shaft, a sealing shaft and a drive shaft are sequentially arranged at the right end of the balancing weight from left to right. A positioning hole is formed in the side part of the driving shaft; a center hole is formed in the middle of the positioning pin, and a deformation groove penetrating through the center hole is formed in the side of the positioning pin. The compressible circular positioning pin is arranged on the driving shaft, so that the stress of a gear train can be reduced, the deformation of the driving shaft in the assembling process is prevented, the noise of the fuel injection pump is reduced, the product reliability is improved, and the overall failure rate of the fuel injection pump is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of engine, in particular to a fuel injection pump drive shaft positioning pin structure. BACKGROUND

[0002] The fuel injection pump is connected with the gear train through the cone surface of the drive shaft, provides the power source, compresses the plunger, and changes the low-pressure oil into high-pressure oil. At present, the upper positioning pin structure of the cone surface of the drive shaft is a semicircular key structure, and the semicircular key is in interference fit with the pin hole on the drive shaft. The drive shaft transmits power by pressing the cone surface, and high precision is required. When assembling the semicircular key, the semicircular key is a solid structure due to the interference fit, which causes deformation of the cone surface, reduces the precision of the cone surface after assembly, and even reduces the area of the cone surface, generates abnormal noise, has high failure rate, and seriously affects the work of the fuel injection pump.

[0003] The disclosure of the above background art content is only used to assist in understanding the utility model concept and technical scheme of the utility model, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a fuel injection pump drive shaft positioning pin structure, which can reduce the force of the gear train, prevent deformation of the drive shaft during assembly, reduce the noise of the fuel injection pump, improve the reliability of the product, and reduce the failure rate of the fuel injection pump as a whole.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A fuel injection pump drive shaft positioning pin structure, characterized in that it comprises a drive spindle and a positioning pin, the middle part of the drive spindle is a counterweight, the left end of the counterweight is sequentially provided with a gear shaft, a first support shaft and an eccentric shaft from left to right, the right end of the counterweight is sequentially provided with a second support, a sealing shaft and a drive shaft from left to right, and a positioning hole is formed in the side part of the drive shaft; the middle part of the positioning pin is a center hole, and a deformation groove is formed in the side part of the positioning pin and penetrates the center hole.

[0007] Further, the drive shaft is conical.

[0008] Further, the positioning hole is a circular hole.

[0009] Further, the positioning pin is circular.

[0010] Further, the deformation groove is curved.

[0011] Further, a chamfer is arranged at the hole opening of the positioning hole.

[0012] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0013] This utility model relates to a positioning pin structure for a fuel injection pump drive shaft. By opening a positioning hole on the drive shaft and engaging a compressible circular positioning pin, only the positioning pin deforms during assembly, while the positioning hole remains undeformed. This significantly reduces the stress on the positioning hole, eliminates the impact of the positioning pin on the accuracy of the conical surface, reduces the stress on the gear train, prevents deformation of the drive shaft during assembly, reduces fuel injection pump noise, improves product reliability, and lowers the overall failure rate of the fuel injection pump. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0015] Fig. 2 This is a schematic diagram of the structure of the drive spindle of this utility model;

[0016] Fig. 3 This is a schematic diagram of the positioning pin of this utility model;

[0017] Fig. 4 This is a top view of the positioning pin of this utility model. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments. 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.

[0019] like Figs. 1-4 As shown, a positioning pin structure for a fuel injection pump drive shaft is characterized by comprising a drive shaft 1 and a positioning pin 2, wherein the positioning pin 2 is circular. A counterweight 3 is located in the middle of the drive shaft 1, serving to balance the entire drive shaft 1. From left to right, the left end of the counterweight 3 comprises a gear shaft 4, a first support shaft 5, and an eccentric shaft 6. From left to right, the right end of the counterweight 3 comprises a second support 7, a sealing shaft 8, and a drive shaft 9. The drive shaft 9 is conical and is driven to rotate by an external power device, thereby driving the fuel pump to draw in fuel. A positioning hole 10, which is circular, is provided on the side of the drive shaft 9. The positioning hole 10 has a chamfer 13 at its opening; the positioning pin 2 has a central hole 11 in the middle, and a deformation groove 12 on its side that passes through the central hole 11. The deformation groove is curved; the positioning pin 2 is assembled in the positioning hole 10. When the positioning pin 2 is assembled, because the positioning pin 2 has a deformation groove 12 on its side, only the positioning pin 2 deforms during the interference fit installation, and the positioning hole 10 does not deform. The force on the positioning hole 10 is greatly reduced, eliminating the influence of the positioning pin 2 on the accuracy of the conical surface. This can reduce the force on the gear train, prevent the drive shaft 9 from deforming during assembly, reduce the noise of the fuel injection pump, improve product reliability, and reduce the overall failure rate of the fuel injection pump.

[0020] The above is a further detailed description of the present application in combination with specific / preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, they can make several substitutions or modifications to the described embodiments, and these substitutions or modifications shall be regarded as falling within the protection scope of the present application.

Claims

1. An oil injection pump drive shaft positioning pin structure, characterized by, Including drive spindle and positioning pin, the middle part of the drive spindle is a counterweight, the left end of the counterweight is sequentially gear shaft, first support shaft, eccentric shaft from left to right, the right end of the counterweight is sequentially second support, sealing shaft, drive shaft from left to right, the side of the drive shaft is provided with positioning hole; The middle part of the positioning pin is a center hole, and the side thereof is provided with a deformation groove penetrating the center hole.

2. An oil injection pump drive shaft positioning pin structure according to claim 1, characterized in that: The drive shaft is conical.

3. An oil injection pump drive shaft positioning pin structure according to claim 1, characterized in that: The positioning hole is a round hole.

4. An oil injection pump drive shaft positioning pin structure according to claim 1, characterized in that: The positioning pin is circular.

5. An oil injection pump drive shaft positioning pin structure according to claim 1, characterized in that: The deformation groove is curved.

6. An oil injection pump drive shaft positioning pin structure according to claim 1, characterized in that: The positioning hole is provided with a chamfer at the hole opening.

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