Wear-resistant plunger and barrel assembly of fuel injection pump

Abstract

The utility model discloses a wear-resistant plunger and barrel assembly of a fuel injection pump, and relates to the technical field of fuel injection pump equipment. Comprising a plunger sleeve mechanism and a plunger mechanism arranged in the plunger sleeve mechanism, the plunger sleeve mechanism comprises a plunger sleeve, an insertion groove is formed in the upper portion of the plunger sleeve, a wear-resistant sleeve assembly is arranged in the insertion groove, and an oil injection assembly is arranged on the outer side of the plunger sleeve. Lubricating oil is injected into an oil storage cavity in a fixing ring through an oil injection hole, the lubricating oil enters a second through hole, an oil inlet hole and a first through hole, when a plunger rod moves upwards, a rotating ball is driven to move in the first through hole, and the rotating ball drives part of the lubricating oil in the first through hole to adhere to a spring lower baffle; the friction between the spring lower baffle and the wear-resistant sleeve is reduced, the wear is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel injection pump equipment, in particular to a wear-resistant plunger pair of a fuel injection pump. Background Art

[0002] A fuel injection pump is a device used to inject fuel into the engine at high pressure. It is mainly used in the fuel supply system of an internal combustion engine. The fuel injection pump plays a vital role in internal combustion engine equipment such as automobiles, diesel generators, and ships. The fuel injection pump is an extremely important component in the engine fuel system, providing the fuel system with appropriate fuel pressure and fuel source to enable it to operate efficiently. When the fuel injection pump is working, it supplies fuel through the reciprocating motion of the internal plunger. Long-term reciprocating motion will cause wear on the plunger sleeve, affecting working stability and shortening its service life. Utility Model Content

[0003] The utility model aims to provide a wear-resistant plunger pair of a fuel injection pump to solve the technical problem that the long-term reciprocating motion of the plunger inside the fuel injection pump causes the plunger sleeve to wear, affects the working stability and shortens the service life.

[0004] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows: a wear-resistant plunger pair of an injection pump, including a plunger sleeve mechanism and a plunger mechanism arranged in the plunger sleeve mechanism, the plunger sleeve mechanism including a plunger sleeve, a spring upper baffle is fixedly connected to the lower outer side of the plunger sleeve, a slot is arranged above the plunger sleeve, a wear-resistant sleeve assembly is arranged in the slot, and an oil injection assembly is arranged on the outer side of the plunger sleeve.

[0005] Preferably, the plunger sleeve mechanism further comprises two oil inlet holes arranged on the outside of the plunger sleeve, and an oil inlet is arranged above the outside of the plunger sleeve.

[0006] Preferably, the wear-resistant sleeve assembly includes a connecting ring, two grooves are arranged above the connecting ring, bolts are arranged in the grooves, the wear-resistant sleeve is fixedly connected to the lower end of the connecting ring, a through groove is arranged above the outer side of the wear-resistant sleeve, two first through holes are arranged below the outer side of the wear-resistant sleeve, and a rotating ball is movably arranged in the first through hole.

[0007] Preferably, thread grooves are provided on the connecting ring and the plunger sleeve.

[0008] Preferably, the oil injection assembly comprises a fixing ring fixedly connected to the outside of the plunger sleeve, an oil injection hole is arranged above the outside of the fixing ring, an oil storage cavity is arranged inside the fixing ring, and two second through holes are arranged below one side of the inside of the fixing ring.

[0009] Preferably, the plunger mechanism comprises a plunger rod slidably connected in the wear-resistant sleeve, the lower end of the plunger rod is fixedly connected to a connecting rod, the lower end of the connecting rod is fixedly connected to a spring lower baffle, and a spring is arranged between the spring lower baffle and the spring upper baffle.

[0010] The utility model provides a wear-resistant plunger pair for a fuel injection pump, which has the following advantages:

[0011] The wear-resistant plunger pair of the fuel injection pump can be quickly replaced and repaired after the wear-resistant sleeve assembly is worn through the arrangement of the slot, the wear-resistant sleeve assembly and the oil injection assembly, thereby saving time. The arrangement of the oil injection assembly enables the device to drive the lubricating oil in the oil injection assembly during operation to lubricate the oil injection assembly and the plunger mechanism, thereby reducing wear and prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

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

[0014] Figure 2 This is a schematic diagram of the structure of the plunger sleeve mechanism of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the wear-resistant sleeve assembly of the utility model;

[0016] Figure 4 This is a schematic diagram of the first through hole structure of the utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the oil injection assembly of the utility model;

[0018] Figure 6 It is a schematic diagram of the structure of the plunger mechanism of the utility model.

[0019] Explanation of marks in the figure: 1. plunger sleeve mechanism; 11. plunger sleeve; 12. spring upper baffle; 13. slot; 14. wear-resistant sleeve assembly; 141. connecting ring; 142. groove; 143. bolt; 144. through groove; 145. wear-resistant sleeve; 146. first through hole; 147. rotating ball; 15. oil inlet hole; 16. oil filling assembly; 161. fixing ring; 162. oil filling hole; 163. second through hole; 17. oil inlet; 2. plunger mechanism; 21. spring lower baffle; 22. spring; 23. connecting rod; 24. plunger rod. DETAILED DESCRIPTION

[0020] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0021] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0024] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0025] In order to better understand the purpose, structure and function of the utility model, the wear-resistant plunger pair of the fuel injection pump of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1 and Figure 2 As shown, the utility model is a wear-resistant plunger pair of a fuel injection pump, comprising a plunger sleeve mechanism 1 and a plunger mechanism 2 arranged in the plunger sleeve mechanism 1, the plunger sleeve mechanism 1 comprising a plunger sleeve 11, a spring upper baffle 12 is fixedly connected to the lower outer side of the plunger sleeve 11, a slot 13 is arranged above the plunger sleeve 11, a wear-resistant sleeve assembly 14 is arranged in the slot 13, the arrangement of the wear-resistant sleeve assembly 14 allows the wear-resistant sleeve assembly 14 to be disassembled and replaced after it is worn, and an oil injection assembly 16 is arranged on the outer side of the plunger sleeve 11.

[0027] like Figure 2 As shown, the plunger sleeve mechanism 1 further includes two oil inlet holes 15 arranged on the outside of the plunger sleeve 11 . The positions of the oil inlet holes 15 correspond to the oil injection assembly 16 . An oil inlet port 17 is arranged on the upper outside of the plunger sleeve 11 .

[0028] like Figure 3 and Figure 4 As shown, the wear-resistant sleeve assembly 14 includes a connecting ring 141, two grooves 142 are arranged above the connecting ring 141, bolts 143 are arranged in the grooves 142, a wear-resistant sleeve 145 is fixedly connected to the lower end of the connecting ring 141, a through groove 144 is arranged above the outer side of the wear-resistant sleeve 145, and the position of the through groove 144 corresponds to the position of the oil inlet 17, two first through holes 146 are arranged below the outer side of the wear-resistant sleeve 145, a rotating ball 147 is movably arranged in the first through hole 146, and the position of the first through hole 146 corresponds to the oil inlet 15.

[0029] The connecting ring 141 and the plunger sleeve 11 are provided with thread grooves, and the bolt 143 is threadedly connected with the connecting ring 141 and the plunger sleeve 11 through the thread grooves.

[0030] like Figure 5 As shown, the oil filling assembly 16 includes a fixed ring 161 fixedly connected to the outside of the plunger sleeve 11, an oil filling hole 162 is arranged on the upper outside of the fixed ring 161, an oil storage chamber is arranged inside the fixed ring 161, the oil storage chamber is used to store lubricating oil, two second through holes 163 are arranged at the lower side of the inside of the fixed ring 161, the second through holes 163 correspond to the oil inlet hole 15, the lubricating oil in the oil storage chamber in the fixed ring 161 enters the oil inlet hole 15 through the second through holes 163 and then enters the first through hole 146, and is blocked by the rotating ball 147, so that the lubricating oil cannot actively flow into the wear-resistant sleeve 145.

[0031] like Figure 6As shown, the plunger mechanism 2 includes a plunger rod 24 slidably connected in the wear-resistant sleeve 145, the lower end of the plunger rod 24 is fixedly connected to a connecting rod 23, the lower end of the connecting rod 23 is fixedly connected to a spring lower baffle 21, a spring 22 is arranged between the spring lower baffle 21 and the spring upper baffle 12, and when the plunger rod 24 moves upward, it drives the rotating ball 147 to rotate in the first through hole 146, and the rotating ball 147 drives part of the lubricating fluid in the first through hole 146 to adhere to the plunger rod 24, so as to lubricate the plunger rod 24.

[0032] To sum up: when the wear-resistant sleeve assembly 14 needs to be replaced, twist the bolt 143 to separate the connecting ring 141, the wear-resistant sleeve 145 and the plunger sleeve 11, pull out the wear-resistant sleeve assembly 14, so that the wear-resistant sleeve assembly 14 is disengaged from the slot 13, and then place the new wear-resistant sleeve assembly 14 in the slot 13, fix the connecting ring 141, the wear-resistant sleeve 145 and the plunger sleeve 11 by the bolt 143, and inject lubricating oil into the oil storage cavity in the fixing ring 161 through the oil filling hole 162, and the lubricating oil enters the second through hole 163 and the oil inlet hole 15 and the first through hole 146. When the plunger rod 24 moves upward, it drives the rotating ball 147 to move in the first through hole 146, and the rotating ball 147 drives part of the lubricating oil in the first through hole 146 to adhere to the spring lower baffle 21, so that the friction between the spring lower baffle 21 and the wear-resistant sleeve 145 is reduced, the wear is reduced, and the service life is increased.

[0033] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A wear-resistant plunger pair of a fuel injection pump, comprising a plunger sleeve mechanism (1) and a plunger mechanism (2) arranged in the plunger sleeve mechanism (1), characterized in that: The plunger sleeve mechanism (1) comprises a plunger sleeve (11), a spring upper baffle (12) is fixedly connected to the lower outer side of the plunger sleeve (11), a slot (13) is arranged above the plunger sleeve (11), a wear-resistant sleeve assembly (14) is arranged in the slot (13), and an oil injection assembly (16) is arranged on the outer side of the plunger sleeve (11); The plunger sleeve mechanism (1) further comprises two oil inlet holes (15) arranged on the outside of the plunger sleeve (11), and an oil inlet port (17) is arranged above the outside of the plunger sleeve (11); The wear-resistant sleeve assembly (14) comprises a connecting ring (141), two grooves (142) are arranged on the top of the connecting ring (141), bolts (143) are arranged in the grooves (142), a wear-resistant sleeve (145) is fixedly connected to the lower end of the connecting ring (141), a through groove (144) is arranged on the upper outer side of the wear-resistant sleeve (145), two first through holes (146) are arranged on the lower outer side of the wear-resistant sleeve (145), and a rotating ball (147) is movably arranged in the first through hole (146).

2. The wear-resistant plunger pair of a fuel injection pump according to claim 1, characterized in that: The connecting ring (141) and the plunger sleeve (11) are provided with thread grooves, and the bolt (143) is threadedly connected to the connecting ring (141) and the plunger sleeve (11) through the thread grooves.

3. The wear-resistant plunger pair of a fuel injection pump according to claim 2, characterized in that: The oil injection assembly (16) comprises a fixing ring (161) fixedly connected to the outside of the plunger sleeve (11), an oil injection hole (162) is provided above the outside of the fixing ring (161), and two second through holes (163) are provided at the bottom of one side of the inside of the fixing ring (161).

4. The wear-resistant plunger pair of a fuel injection pump according to claim 3, characterized in that: The plunger mechanism (2) comprises a plunger rod (24) slidably connected in a wear-resistant sleeve (145); the lower end of the plunger rod (24) is fixedly connected to a connecting rod (23); the lower end of the connecting rod (23) is fixedly connected to a spring lower baffle (21); and a spring (22) is provided between the spring lower baffle (21) and the spring upper baffle (12).

5. The wear-resistant plunger pair of a fuel injection pump according to claim 4, characterized in that: One end of the spring (22) is fixedly connected below the spring upper baffle (12), and the other end of the spring (22) is fixedly connected above the spring lower baffle (21).

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