Wear-resistant plunger and barrel assembly

Abstract

The wear-resistant plunger and barrel assembly comprises a plunger sleeve, an outer clamping groove is formed in the outer wall of the top of the plunger sleeve in a surrounding mode, a first mounting hole is vertically formed in the edge of the bottom of the plunger sleeve in a penetrating mode, and a second mounting hole is vertically formed in the bottom of the plunger sleeve in a penetrating mode. An upper positioning hole is formed in the upper portion of the center of the plunger sleeve, the bottom end of the upper positioning hole is connected with the top end of a lower positioning hole, the lower positioning hole is formed in the bottom of the center of the plunger sleeve, the bottom end of the lower positioning hole is communicated with the top end of a bottom mounting groove, and the bottom mounting groove is formed in the bottom end of the plunger sleeve. And plunger bodies are mounted in the upper positioning holes and the lower positioning holes. According to the wear-resistant plunger and barrel assembly, the novel structural design is adopted, all components of the plunger and the plunger sleeve are greatly optimized, it is guaranteed that the plunger sleeve can be stably installed, the plunger can stably and linearly move in the plunger sleeve, and through the two-section design, pressurization of fuel and a certain lubricating gap are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pairs, and particularly relates to a wear-resistant plunger pair. Background Technique

[0002] The plunger pair, also known as the combination of a plunger and a plunger sleeve, is a pair of precision parts in a fuel injection pump composed of a plunger and a plunger sleeve. The main function of the plunger pair is to increase the diesel pressure to meet the requirements of the injection pressure of the injector nozzle, and to control the fuel quantity and the fuel supply time. In addition to increasing the fuel pressure, the plunger and the plunger sleeve also need to accurately control the fuel supply quantity and the injection time. Therefore, there is a strict clearance between them to ensure fuel pressurization and a certain lubrication clearance.

[0003] The overall diameter of the existing plunger pair is relatively small. After installation, the pressure per unit area in contact with the installation base during operation is relatively large, which is likely to cause deformation of the installation part, resulting in a slight deviation of the plunger sleeve, leading to abnormal friction between the plunger and the plunger sleeve, and affecting the service life of the plunger pair. In view of the above problems, it is urgent to innovate and design on the basis of the original plunger pair. Content of the Utility Model

[0004] The purpose of the utility model is to provide a wear-resistant plunger pair to solve the problems in the above background technique that the overall diameter of the existing plunger pair is relatively small, the pressure in contact with the installation base during operation after installation is relatively large, which is likely to cause deformation of the installation part, resulting in a slight deviation of the plunger sleeve, leading to abnormal friction between the plunger and the plunger sleeve, and affecting the service life of the plunger pair.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a wear-resistant plunger pair, including a plunger sleeve. An outer card slot is circumferentially opened on the outer wall of the top of the plunger sleeve. A first installation hole is vertically penetrated through the bottom edge of the plunger sleeve. A second installation hole is vertically penetrated through the bottom of the plunger sleeve. An upper positioning hole is opened in the upper part of the center of the plunger sleeve. The bottom end of the upper positioning hole is connected to the top end of the lower positioning hole. The lower positioning hole is opened at the bottom of the center of the plunger sleeve. The bottom end of the lower positioning hole is communicated with the top end of the bottom installation groove. The bottom installation groove is opened at the bottom end of the plunger sleeve. A plunger body is installed in the upper positioning hole and the lower positioning hole.

[0006] Preferably, the plunger sleeve includes an upper sleeve and a lower support plate. The upper sleeve is arranged above the lower support plate. The diameter of the upper sleeve is smaller than that of the lower support plate.

[0007] Preferably, the first installation holes are equiangularly distributed about the center of the lower support plate at the edge of the lower support plate. The diameter of the first installation hole is larger than that of the second installation hole. The second installation holes are symmetrically distributed about the center of the lower support plate.

[0008] Preferably, the diameter of the upper positioning hole is larger than that of the lower positioning hole, and the diameter of the upper positioning hole is smaller than that of the bottom mounting groove.

[0009] Preferably, the plunger body includes an upper cylinder and a lower cylinder, and the diameter of the upper cylinder is larger than that of the lower cylinder.

[0010] Preferably, a top connection hole and a bottom connection hole are respectively formed at the top end and the bottom end of the plunger body. The centers of the top connection hole and the bottom connection hole are both on the same vertical line as the center of the plunger body, and the diameter of the top connection hole is smaller than that of the bottom connection hole.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: The wear-resistant plunger couple adopts a new structural design, greatly optimizes each component of the plunger and the plunger sleeve, ensures the stable installation of the plunger sleeve, enables the plunger to perform stable linear movement within the plunger sleeve, and through the two-stage design, ensures the pressurization of the fuel and a certain lubrication gap;

[0012] 1. Through the structural design of the upper sleeve and the lower support plate, on the premise of ensuring the overall stable installation of the plunger couple, the bottom end of the plunger sleeve can be stably connected to the installation base over a large area, reducing the pressure per unit area during operation, preventing the plunger sleeve from shifting, and ensuring that there is no abnormal friction between the plunger and the plunger sleeve, thereby extending the overall service life of the plunger couple;

[0013] 2. Through the upper cylinder, lower cylinder, upper positioning hole and lower positioning hole with different diameters, the clearance between the plunger and the plunger sleeve is ensured, thereby ensuring the pressurization of the fuel and a certain lubrication gap, and enabling the plunger couple to have better use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a front view structural schematic diagram of the present utility model;

[0015] Figure 2 is a front view sectional structural schematic diagram of the upper positioning hole and the lower positioning hole of the present utility model;

[0016] Figure 3 is a front view sectional structural schematic diagram of the plunger sleeve of the present utility model;

[0017] Figure 4 is a front view sectional structural schematic diagram of the plunger body of the present utility model;

[0018] Figure 5 is a top view structural schematic diagram of the plunger sleeve of the present utility model.

[0019] In the figure: 1, plunger sleeve; 101, upper sleeve; 102, lower support plate; 2, outer card slot; 3, first mounting hole; 4, second mounting hole; 5, upper positioning hole; 6, lower positioning hole; 7, bottom mounting groove; 8, plunger body; 801, upper cylinder body; 802, lower cylinder body; 9, top connection hole; 10, bottom connection hole. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1-5 , the present invention provides a technical solution: a wear-resistant plunger pair, including a plunger sleeve 1, an upper sleeve 101, a lower support plate 102, an outer card slot 2, a first mounting hole 3, a second mounting hole 4, an upper positioning hole 5, a lower positioning hole 6, a bottom mounting groove 7, a plunger body 8, an upper cylinder body 801, a lower cylinder body 802, a top connection hole 9 and a bottom connection hole 10. An outer card slot 2 is circumferentially opened on the outer wall of the top of the plunger sleeve 1. A first mounting hole 3 is vertically penetrated through the bottom edge of the plunger sleeve 1. A second mounting hole 4 is vertically penetrated through the bottom of the plunger sleeve 1. An upper positioning hole 5 is opened in the upper part of the center of the plunger sleeve 1. The bottom end of the upper positioning hole 5 is connected to the top end of the lower positioning hole 6. The lower positioning hole 6 is opened at the bottom of the center of the plunger sleeve 1. The bottom end of the lower positioning hole 6 is communicated with the top end of the bottom mounting groove 7. The bottom mounting groove 7 is opened at the bottom end of the plunger sleeve 1. A plunger body 8 is installed in the upper positioning hole 5 and the lower positioning hole 6.

[0022] The plunger sleeve 1 in this example includes an upper sleeve 101 and a lower support plate 102. The upper sleeve 101 is arranged above the lower support plate 102. The diameter of the upper sleeve 101 is smaller than the diameter of the lower support plate 102. The above structural design enables the lower support plate 102 to be in large-area contact connection with the installation base.

[0023] The first mounting holes 3 are equiangularly distributed about the center of the lower support plate 102 at the edge of the lower support plate 102. The diameter of the first mounting holes 3 is larger than the diameter of the second mounting holes 4. The second mounting holes 4 are symmetrically distributed about the center of the lower support plate 102. The above structural design ensures that the installation tool can stably connect the plunger sleeve 1 with the installation base through the first mounting holes 3 and the second mounting holes 4.

[0024] The diameter of the upper positioning hole 5 is larger than the diameter of the lower positioning hole 6. The diameter of the upper positioning hole 5 is smaller than the diameter of the bottom mounting groove 7. The above structural design and the plunger body 8 can ensure the fitting clearance.

[0025] The plunger body 8 includes an upper cylinder body 801 and a lower cylinder body 802. The diameter of the upper cylinder body 801 is greater than that of the lower cylinder body 802. The above structural design, in cooperation with the upper positioning hole 5 and the lower positioning hole 6, can ensure the pressurization of fuel and a certain lubrication clearance.

[0026] A top connection hole 9 and a bottom connection hole 10 are respectively formed at the top end and the bottom end of the plunger body 8. The centers of the top connection hole 9 and the bottom connection hole 10 are both on the same vertical line as the center of the plunger body 8. The diameter of the top connection hole 9 is smaller than that of the bottom connection hole 10. The above structural design facilitates the connection of the top end and the bottom end of the plunger body 8 to other components respectively.

[0027] Working principle: During installation, an existing tool is used to pass through the first installation hole 3 and the second installation hole 4 to stably connect the plunger sleeve 1 to the installation base. The plunger body 8 is inserted into the first installation hole 3 and the second installation hole 4, and the top connection hole 9 and the bottom connection hole 10 formed at the top end and the bottom end of the plunger body 8 are respectively connected to the matching components;

[0028] During operation, due to the diameter difference between the first installation hole 3 and the second installation hole 4, and the diameter difference between the upper cylinder body 801 and the lower cylinder body 802, when the plunger body 8 moves linearly within the plunger sleeve 1, it can ensure the pressurization of fuel and a certain lubrication clearance. This is the working principle of this wear-resistant plunger pair.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant plunger pair, comprising a plunger sleeve (1), characterized in that: An outer groove (2) is provided around the outer wall of the top of the plunger sleeve (1); a first mounting hole (3) is vertically penetrated through the bottom edge of the plunger sleeve (1); a second mounting hole (4) is vertically penetrated through the bottom of the plunger sleeve (1); an upper positioning hole (5) is provided at the center upper part of the plunger sleeve (1); the bottom end of the upper positioning hole (5) is connected to the top end of the lower positioning hole (6); the lower positioning hole (6) is provided at the center bottom of the plunger sleeve (1); the bottom end of the lower positioning hole (6) is connected to the top end of the bottom mounting groove (7); the bottom mounting groove (7) is provided at the bottom end of the plunger sleeve (1); and a plunger body (8) is installed in the upper positioning hole (5) and the lower positioning hole (6).

2. A wear-resistant plunger pair according to claim 1, characterized in that: The plunger sleeve (1) comprises an upper sleeve (101) and a lower support disk (102); the upper sleeve (101) is arranged above the lower support disk (102); and the diameter of the upper sleeve (101) is smaller than the diameter of the lower support disk (102).

3. A wear-resistant plunger pair according to claim 2, characterized in that: The first mounting holes (3) are distributed at equal angles on the edge of the lower support plate (102) with respect to the center of the lower support plate (102); the diameter of the first mounting holes (3) is greater than the diameter of the second mounting holes (4); and the second mounting holes (4) are distributed symmetrically with respect to the center of the lower support plate (102).

4. A wear-resistant plunger pair according to claim 1, characterized in that: The diameter of the upper positioning hole (5) is greater than the diameter of the lower positioning hole (6), and the diameter of the upper positioning hole (5) is smaller than the diameter of the bottom mounting groove (7).

5. The wear-resistant plunger pair according to claim 1, characterized in that: The plunger body (8) comprises an upper cylinder (801) and a lower cylinder (802), and the diameter of the upper cylinder (801) is greater than the diameter of the lower cylinder (802).

6. The wear-resistant plunger pair according to claim 1, characterized in that: A top connecting hole (9) and a bottom connecting hole (10) are respectively formed at the top and bottom ends of the plunger body (8); the centers of the top connecting hole (9) and the bottom connecting hole (10) are both located on the same vertical line as the center of the plunger body (8); and the diameter of the top connecting hole (9) is smaller than the diameter of the bottom connecting hole (10).

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