Toothed plunger and barrel assembly

Abstract

The utility model discloses a toothed plunger and barrel assembly which comprises a plunger sleeve, a mounting disc is arranged at the bottom of the plunger sleeve, an upper mounting hole is formed in the center of the top of the plunger sleeve, the bottom end of the upper mounting hole is communicated with the top end of a lower mounting hole, and a blocking ring is fixedly mounted on an upper plunger. Upper positioning teeth are arranged on the surface of the upper plunger at the bottom of the blocking ring, the upper positioning teeth are attached to upper tooth grooves, the upper tooth grooves are formed in the inner wall of the upper mounting hole, lower tooth grooves are formed in the surface of the lower plunger, the inner walls of the lower tooth grooves are attached to the lower positioning teeth, and the lower positioning teeth are arranged on the inner wall of the lower mounting hole. According to the toothed plunger and barrel assembly, the novel structural design is adopted, the plunger sleeve and the installation disc can be stably connected with an oil pump structure and are not prone to deflection, the plunger and the plunger sleeve can be stably attached through the upper tooth groove structure and the lower tooth groove structure, the contact area is increased, stability is improved, and meanwhile it is guaranteed that the plunger and the plunger sleeve cannot rotate relatively.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pairs, in particular to a plunger pair with teeth. Background Art

[0002] The plunger pair is a pair of precision parts in the fuel injection pump, consisting of a plunger and a plunger sleeve. The plunger can reciprocate up and down relative to the plunger sleeve. Under the action of the oil pump cam, the plunger reciprocates at high speed in the plunger sleeve. When the plunger moves upward, the fuel is compressed and pressurized. When the plunger moves downward, the fuel is released and supplied to the engine.

[0003] The existing plunger assembly features smooth curved surfaces on both the outer and inner walls of the plunger sleeve. While this allows for smooth linear relative movement, it is prone to rotation under high pressure, and the contact area needs to be improved, resulting in insufficient overall stability and reliability. To address these issues, an innovative design based on the existing plunger assembly is urgently needed. Utility Model Content

[0004] The purpose of the present invention is to provide a toothed plunger pair to solve the problems in the above background art that the existing plunger pair is prone to rotation under high pressure, the contact area needs to be improved, and the overall stability and reliability are insufficient.

[0005] The top end of the piston rod is connected with the piston rod of the piston rod and the bottom end of the piston rod is connected with the piston rod of the piston rod.

[0006] Preferably, the plunger sleeve and the mounting plate are an integrated structure, and the overall shape of the plunger sleeve and the mounting plate when viewed from the front is a "丄" shape.

[0007] Preferably, an assembly hole is provided on the mounting plate, and an outer mounting groove is provided on the edge of the mounting plate.

[0008] Preferably, the assembly holes and the outer mounting grooves are distributed at equal angles with respect to the center of the mounting plate, and the assembly holes and the outer mounting grooves are both through-hole designs.

[0009] Preferably, the diameter of the upper mounting hole is greater than that of the lower mounting hole, and equiangular upper tooth grooves are formed on the inner wall of the upper mounting hole, and equiangular lower positioning teeth are arranged on the inner wall of the lower mounting hole.

[0010] Preferably, the diameter of the upper plunger is greater than that of the lower plunger, equiangular upper positioning teeth are arranged on the surface of the upper plunger below the mounted blocking ring, and equiangular lower tooth grooves are formed on the surface of the lower plunger.

[0011] Preferably, the diameter of the blocking ring is smaller than the diameter of the top surface of the plunger sleeve, and the bottom surface of the blocking ring is connected with the top end of the upper positioning teeth.

[0012] Preferably, the length of the lower tooth groove is greater than that of the lower positioning teeth, the top end of the lower tooth groove is communicated with the bottom end of the upper mounting hole, and the bottom end opening of the lower tooth groove is located at the edge of the bottom surface of the lower plunger.

[0013] Compared with the prior art, the beneficial effects of the toothed plunger pair are as follows: the toothed plunger pair adopts a novel structure design, the plunger sleeve and the mounting disc can be stably connected with the oil pump structure and are not easy to deflect, the plunger and the plunger sleeve can be stably attached through the upper and lower tooth groove structures, the contact area is increased and the stability is improved, and the relative rotation of the plunger and the plunger sleeve is avoided.

[0014] 1. The plunger sleeve and the mounting disc can be stably connected with the mounting positions of the oil pump through the outer clamping grooves and the outer mounting grooves, the stable installation of the plunger sleeve as a whole is ensured, and the deflection of the plunger sleeve in the working process is avoided.

[0015] 2. The plunger and the plunger sleeve are stably positioned from the upper and lower parts through the cooperation of the upper positioning teeth, the upper tooth grooves, the lower tooth grooves and the lower positioning teeth, the contact area of the plunger and the plunger sleeve is increased, the stability is improved, and the relative rotation of the plunger and the plunger sleeve is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the utility model;

[0017] Figure 2 It is a front view sectional structural schematic diagram of the utility model;

[0018] Figure 3 It is a front view structural schematic diagram of the upper plunger and the lower plunger of the utility model;

[0019] Figure 4 It is a front view sectional structural schematic diagram of the upper positioning teeth and the upper tooth grooves of the utility model;

[0020] Figure 5 It is a front view sectional structural schematic diagram of the lower tooth grooves and the lower positioning teeth of the utility model.

[0021] In the figure: 1. Plunger sleeve; 2. Mounting plate; 3. Upper mounting hole; 4. Lower mounting hole; 5. Assembly groove; 6. External slot; 7. Assembly hole; 8. External mounting groove; 9. Upper plunger; 10. Lower plunger; 11. Blocking ring; 12. Upper positioning tooth; 13. Upper tooth groove; 14. Lower tooth groove; 15. Lower positioning tooth. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-5 The utility model provides a technical solution: a toothed plunger pair, including a plunger sleeve 1, a mounting plate 2, an upper mounting hole 3, a lower mounting hole 4, an assembly groove 5, an outer card groove 6, an assembly hole 7, an outer mounting groove 8, an upper plunger 9, a lower plunger 10, a blocking ring 11, an upper positioning tooth 12, an upper tooth groove 13, a lower tooth groove 14 and a lower positioning tooth 15. The bottom of the plunger sleeve 1 is provided with a mounting plate 2, the top center of the plunger sleeve 1 is provided with an upper mounting hole 3, the bottom end of the upper mounting hole 3 is connected to the top end of the lower mounting hole 4, the lower mounting hole 4 is provided at the bottom center of the mounting plate 2, and the bottom end of the lower mounting hole 4 is provided with an assembly groove 5. The groove 5 is opened in the center of the bottom surface of the mounting plate 2, and an external card groove 6 is opened on the outer wall of the top of the plunger sleeve 1. An upper plunger 9 is provided in the upper mounting hole 3, and a lower plunger 10 is provided at the bottom end of the upper plunger 9. The lower plunger 10 is arranged in the lower mounting hole 4. A blocking ring 11 is fixedly mounted on the upper plunger 9. The surface of the upper plunger 9 at the bottom of the blocking ring 11 is provided with an upper positioning tooth 12, and the upper positioning tooth 12 is fitted with the upper tooth groove 13. The upper tooth groove 13 is opened on the inner wall of the upper mounting hole 3. A lower tooth groove 14 is opened on the surface of the lower plunger 10, and the inner wall of the lower tooth groove 14 is fitted with the lower positioning tooth 15. The lower positioning tooth 15 is provided on the inner wall of the lower mounting hole 4.

[0024] The plunger sleeve 1 and the mounting plate 2 of this example are an integrated structure, and the overall shape of the plunger sleeve 1 and the mounting plate 2 when viewed from the front is a "丄" shape. The above-mentioned structural design makes the plunger sleeve 1 and the mounting plate 2 have high structural strength and can be stably installed.

[0025] An assembly hole 7 is provided on the mounting plate 2, and an outer mounting groove 8 is provided on the edge of the mounting plate 2. The above structure is designed so that the mounting plate 2 can be stably connected to the oil pump installation position to ensure the overall stability of the device.

[0026] The assembly hole 7 and the outer mounting groove 8 are distributed at equal angles about the center of the mounting plate 2. The assembly hole 7 and the outer mounting groove 8 are both through-designed. The above structural design facilitates the assembly of the mounting plate 2 and also helps to improve the overall stability of the plunger sleeve 1 and the mounting plate 2.

[0027] The diameter of the upper mounting hole 3 is larger than the diameter of the lower mounting hole 4. An upper tooth groove 13 is provided at an equal angle on the inner wall of the upper mounting hole 3, and a lower positioning tooth 15 is provided at an equal angle on the inner wall of the lower mounting hole 4. The above structural design can ensure the stable installation and use of the upper plunger 9 and the lower plunger 10.

[0028] The diameter of the upper plunger 9 is larger than that of the lower plunger 10. Upper positioning teeth 12 are provided at equal angles on the surface below the blocking ring 11 installed on the upper plunger 9, and lower tooth grooves 14 are provided at equal angles on the surface of the lower plunger 10. The above-mentioned structural design is combined with the upper tooth grooves 13 and the lower positioning teeth 15 to increase the contact area between the upper plunger 9 and the lower plunger 10 and the upper mounting hole 3 and the lower mounting hole 4, which can effectively improve stability.

[0029] The diameter of the blocking ring 11 is smaller than the top diameter of the plunger sleeve 1, and the bottom surface of the blocking ring 11 is connected to the top of the upper positioning tooth 12. The above structural design can prevent the blocking ring 11 from hindering the installation of the plunger sleeve 1, and at the same time can limit the movement stroke of the upper plunger 9.

[0030] The length of the lower tooth groove 14 is greater than the length of the lower positioning tooth 15. The top of the lower tooth groove 14 is connected to the bottom of the upper mounting hole 3. The bottom opening of the lower tooth groove 14 is located at the bottom edge of the lower plunger 10. The above structural design ensures that the lower positioning tooth 15 and the lower tooth groove 14 can move smoothly and in the same manner.

[0031] Working principle: When installing, align the assembly hole 7 and the outer mounting groove 8 with the oil pump station, use existing tools to connect, avoid the plunger sleeve 1 and the mounting plate 2 from deflecting during operation, and the upper plunger 9 and the lower plunger 10 as shown. Figure 2 As shown in the assembly, they are stably fitted with the upper mounting hole 3 and the lower mounting hole 4 respectively, and the bottom surface of the blocking ring 11 is fitted with the top surface of the plunger sleeve 1;

[0032] The stable fit between the upper positioning teeth 12 and the upper tooth grooves 13, as well as the lower tooth grooves 14 and the lower positioning teeth 15, ensures that the upper plunger 9 and the lower plunger 10 will not rotate during operation. At the same time, the contact area between the upper plunger 9 and the lower plunger 10 and the upper mounting holes 3 and the lower mounting holes 4 is increased, effectively improving stability. This is the working principle of the toothed plunger pair.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A toothed plunger pair, comprising a plunger sleeve (1), characterized in that: The bottom of the plunger sleeve (1) is provided with a mounting disc (2). The center of the top of the plunger sleeve (1) is provided with an upper mounting hole (3). The bottom end of the upper mounting hole (3) is communicated with the top end of a lower mounting hole (4). The lower mounting hole (4) is opened at the center of the bottom of the mounting disc (2). The bottom end of the lower mounting hole (4) is provided with an assembly groove (5). The assembly groove (5) is opened at the center of the bottom surface of the mounting disc (2). An outer clamping groove (6) is opened on the outer wall of the top of the plunger sleeve (1). An upper plunger (9) is arranged in the upper mounting hole (3). The bottom end of the upper plunger (9) is provided with a lower plunger (10). The lower plunger (10) is arranged in the lower mounting hole (4). A blocking ring (11) is fixedly installed on the upper plunger (9). Upper positioning teeth (12) are arranged on the surface of the upper plunger (9) at the bottom of the blocking ring (11). The upper positioning teeth (12) are in fit with upper tooth grooves (13). The upper tooth grooves (13) are opened on the inner wall of the upper mounting hole (3). Lower tooth grooves (14) are opened on the surface of the lower plunger (10). The inner wall of the lower tooth grooves (14) is in fit with lower positioning teeth (15). The lower positioning teeth (15) are arranged on the inner wall of the lower mounting hole (4).

2. The toothed plunger pair according to claim 1, characterized in that: The plunger sleeve (1) and the mounting disc (2) are of an integral structure. The overall front view shape of the plunger sleeve (1) and the mounting disc (2) is a "丄" shape.

3. The toothed plunger pair according to claim 1, characterized in that: Assembly holes (7) are opened on the mounting disc (2). An outer mounting groove (8) is opened at the edge of the mounting disc (2).

4. The toothed plunger pair according to claim 3, characterized in that: Both the assembly holes (7) and the outer mounting grooves (8) are distributed at equal angles with respect to the center of the mounting disc (2). Both the assembly holes (7) and the outer mounting grooves (8) are of a through design.

5. The toothed plunger pair according to claim 1, characterized in that: The diameter of the upper mounting hole (3) is larger than the diameter of the lower mounting hole (4). Upper tooth grooves (13) are opened at equal angles on the inner wall of the upper mounting hole (3). Lower positioning teeth (15) are arranged at equal angles on the inner wall of the lower mounting hole (4).

6. The toothed plunger pair according to claim 1, characterized in that: The diameter of the upper plunger (9) is larger than the diameter of the lower plunger (10). Upper positioning teeth (12) are arranged at equal angles on the surface below the blocking ring (11) installed on the upper plunger (9). Lower tooth grooves (14) are opened at equal angles on the surface of the lower plunger (10).

7. The toothed plunger pair according to claim 1, characterized in that: The diameter of the blocking ring (11) is smaller than the diameter of the top surface of the plunger sleeve (1). The bottom surface of the blocking ring (11) is connected to the top end of the upper positioning teeth (12).

8. The toothed plunger pair according to claim 1, characterized in that: The length of the lower tooth grooves (14) is larger than the length of the lower positioning teeth (15). The top end of the lower tooth grooves (14) is communicated with the bottom end of the upper mounting hole (3). The bottom end opening of the lower tooth grooves (14) is located at the bottom edge of the lower plunger (10).

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