Fuel injection pump convenient to assemble

Abstract

The utility model belongs to the technical field of combustion engines, and particularly relates to supply of combustible mixtures of common combustion engines or components of the combustible mixtures, in particular to a fuel injection pump convenient to assemble, which comprises a pump body and a fuel outlet valve fastening seat, the fuel outlet valve fastening seat is arranged on the fuel outlet side of the pump body, and the outer wall of the fuel outlet valve fastening seat is attached to the inner wall of the pump body. The pressurizing mechanism is arranged in the pump body and is suitable for pushing oil in the pump body to be sprayed out from the oil outlet valve tight seat; the guide groove is formed in the assembly area of the pump body and the oil outlet valve fastening seat, so that the sealing ring assembled on the outer wall of the oil outlet valve fastening seat can be conveniently installed, and when the oil outlet valve fastening seat is installed, the sealing ring is attached to the side wall of the guide groove and sinks to the groove bottom of the guide groove. The oil outlet valve holder with the sealing ring is convenient to mount, so that the oil injection pump is convenient to mount.

Description

Technical Field

[0001] The utility model belongs to the technical field of combustion engines, and particularly relates to the supply of combustible mixtures for general combustion engines or components thereof, and more particularly to a fuel injection pump that is convenient for assembly. Background Art

[0002] Air-cooled diesel engines have many advantages such as low operating cost, environmental protection, and flexibility, and are increasingly attracting people's attention and being widely used in fields such as agriculture, construction, industry, ships, and vehicles, such as water pumps, micro-tillers, compressors, vibrators, and generators. With the development of technology and the improvement of environmental protection requirements, the technological development of air-cooled diesel engines is also constantly advancing. New materials, advanced technologies, and manufacturing processes enable new engines to be more efficient, have a longer service life, and at the same time can reduce exhaust gas emissions and environmental pollution. In the existing fuel injection pumps of diesel engines, in order to avoid leakage in the low-pressure chamber, a sealing ring is used to seal between the pump body and the valve seat of the delivery valve. Generally, the sealing ring is compressed to seal the gap between the pump body and the valve seat of the delivery valve, which makes it difficult to install the valve seat of the delivery valve.

[0003] In order to solve the technical problem of difficult installation of the valve seat of the delivery valve in the fuel injection pump, a fuel injection pump that is convenient for assembly needs to be designed.

[0004] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute the prior art. Summary of the Utility Model

[0005] This disclosure embodiment provides at least a fuel injection pump that is convenient for assembly.

[0006] In a first aspect, this disclosure embodiment provides a fuel injection pump that is convenient for assembly, including: a pump body,

[0007] a valve seat of the delivery valve, which is arranged on the oil outlet side of the pump body, and the outer wall of the valve seat of the delivery valve fits with the inner wall of the pump body;

[0008] a pressurizing mechanism, which is arranged in the pump body and is adapted to push the oil in the pump body to spray out from the valve seat of the delivery valve;

[0009] a sealing ring, which is sleeved outside the valve seat of the delivery valve and is adapted to seal the gap between the valve seat of the delivery valve and the pump body; wherein

[0010] the pump body is provided with a guiding groove, and the guiding groove is located in the assembly area between the pump body and the valve seat of the delivery valve;

[0011] When the valve seat of the delivery valve is installed, the guiding groove is adapted to provide a space for the sealing ring to be installed.

[0012] In an alternative embodiment, a tightening ring is threadedly connected to the outer sidewall of the fuel outlet valve seat, and a plurality of tightening pieces are provided on the tightening ring;

[0013] Each of the tightening pieces faces the sealing ring; wherein

[0014] After the fuel outlet valve seat is installed in place, rotate the tightening ring so that the tightening pieces move towards the sealing ring and tighten it.

[0015] In an alternative embodiment, a limiting groove is provided on the outer sidewall of the fuel outlet valve seat, and the sealing ring is sleeved in the limiting groove; and

[0016] The fuel outlet valve seat is provided with a plurality of vertical through holes, and each of the vertical through holes corresponds to one of the tightening pieces; wherein

[0017] The tightening piece passes through the vertical through hole and then tightens the sealing ring.

[0018] In an alternative embodiment, the tightening pieces are evenly distributed along the circumferential direction of the tightening ring.

[0019] In an alternative embodiment, the pump body is provided with a chamfer at the top of the guiding groove, which is adapted to guide the sealing ring into the guiding groove.

[0020] In an alternative embodiment, the fuel outlet valve seat has an oil storage cavity, and the oil storage cavity is adapted to communicate with the inner cavity of the pump body; and

[0021] The fuel outlet valve seat is provided with an oil injection port; wherein

[0022] The pressurizing mechanism is adapted to push the oil in the oil storage cavity out from the oil injection port.

[0023] In an alternative embodiment, the pressurizing mechanism includes an oil outlet valve spring, an oil outlet valve pair, a plunger pair, a plunger spring, a spring lower seat and a tappet body that are sequentially abutted from top to bottom; wherein

[0024] Both the oil outlet valve pair and the plunger pair are of a hollow structure, and a plunger body is sleeved inside them; and

[0025] The bottom of the plunger body abuts against the spring lower seat, and the top of the plunger body extends into the oil storage cavity;

[0026] The oil outlet valve spring is arranged in the oil storage cavity;

[0027] When the tappet body is pushed, the plunger body pushes the oil in the oil storage cavity out from the oil injection port.

[0028] In an alternative embodiment, there is an abutting surface within the pump body, which is located below the plunger pair; and

[0029] The fuel outlet valve holder is threadedly connected to the pump body; wherein

[0030] When the fuel outlet valve holder is tightened, the plunger pair abuts against the abutting surface.

[0031] In an alternative embodiment, rollers are provided on the tappet body.

[0032] In a second aspect, an embodiment of the present disclosure further provides a fuel injection pump that is easy to assemble, including:

[0033] A pump body, the material of the pump body (1) is aluminum alloy, and the aluminum alloy is national standard aluminum ADC12,

[0034] A fuel outlet valve holder, the fuel outlet valve holder is arranged on the fuel outlet side of the pump body, and the outer wall of the fuel outlet valve holder fits with the inner wall of the pump body;

[0035] A pressurizing mechanism, the pressurizing mechanism is arranged within the pump body, and is adapted to push the oil within the pump body to spray out from the fuel outlet valve holder;

[0036] A sealing ring, which is adapted to seal the gap between the fuel outlet valve holder and the pump body;

[0037] A limiting groove is provided on the outer side wall of the fuel outlet valve holder, and the sealing ring is sleeved within the limiting groove; wherein

[0038] A guiding groove is provided in the pump body at the assembly area with the fuel outlet valve holder;

[0039] When the fuel outlet valve holder is installed, the guiding groove is adapted to provide a space for the sealing ring to be inserted.

[0040] The beneficial effect of the present utility model is that by providing a guiding groove in the pump body at the assembly area with the fuel outlet valve holder, it is convenient for the sealing ring assembled on the outer wall of the fuel outlet valve holder to be inserted. When the fuel outlet valve holder is installed, the sealing ring fits against the side wall of the guiding groove and sinks to the bottom of the guiding groove, achieving the effect of facilitating the installation of the fuel outlet valve holder with a sealing ring, and thus facilitating the installation of the fuel injection pump.

[0041] Other features and advantages of the present utility model will be described in the subsequent specification, and will, in part, be obvious from the specification, or can be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings.

[0042] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and detailed descriptions are as follows. Description of the Drawings

[0043] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 The structural schematic diagram of a fuel injection pump that is convenient for assembly provided by an embodiment of the present disclosure.

[0045] In the figure:

[0046] Pump body 1, guiding groove 11, chamfer 12, abutting surface 13;

[0047] Delivery valve holder 2, tightening ring 21, tightening piece 22, limiting groove 23, vertical through hole 24, oil storage cavity 25, fuel injection port 26, rotating ring 27;

[0048] Pressurizing mechanism 3, delivery valve spring 31, delivery valve pair 32, plunger pair 33, plunger spring 34, spring lower seat 35, tappet body 36, plunger body 37, roller 38;

[0049] Sealing ring 4. Specific Embodiments

[0050] To make the objects, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0051] Through research, it is found that for the fuel injection pump in the existing diesel engine, in order to avoid leakage of the low-pressure chamber, a sealing ring is used to seal between the pump body and the delivery valve holder. Generally, the sealing ring is compressed to seal the gap between the pump body and the delivery valve holder, which makes it difficult to install the delivery valve holder.

[0052] Therefore, there is an urgent need to design a fuel injection pump that is convenient for assembly to solve the technical problem that it is difficult to install the delivery valve holder with a sealing ring into the pump body.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, in the drawings, for the purpose of effectively describing the technical content, the thickness of components may be exaggerated or reduced. The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0054] Based on the above research, to solve the above technical problems, please refer to Figure 1 , an embodiment of the present disclosure provides a fuel injection pump that is easy to assemble, including a pump body 1, an outlet valve holder 2 installed on the oil outlet side of the pump body 1, and a pressurizing mechanism 3 installed in the pump body 1. After the outlet valve holder 2 is installed on the pump body 1, the outer side wall of the outlet valve holder 2 fits with the inner side wall of the pump body 1. The oil in the pump body 1 is sprayed out through the outlet valve holder 2. The pressurizing mechanism 3 provides power for the oil in the pump body 1, and it can push the oil in the pump body 1 to be sprayed out through the outlet valve holder 2 to achieve fuel injection of the fuel injection pump. A sealing ring 4 is sleeved outside the outlet valve holder 2. By providing a guiding groove 11 at the installation position of the outlet valve holder 2 with the sealing ring 4, that is, on the pump body 1, and the guiding groove 11 is in the assembly area of the outlet valve holder 2, so that when the outlet valve holder 2 is installed, the guiding groove 11 provides space for the installation of the sealing ring 4, facilitating the installation of the outlet valve holder 2, that is, achieving the effect of facilitating the installation of the fuel injection pump.

[0055] In some embodiments, the pump body 1 is cast from aluminum alloy, achieving the effects of small weight, good cleanliness, and low price. The aluminum alloy is the national standard aluminum ADC12, which is a copper-aluminum alloy. The composition of the aluminum alloy, by weight: Si: 9.6 - 12; Cu: 1.5 - 3.5; Fe: <1.2; Mg: <0.3: Mn: <0.5: Zn: <1.0; Pb: <0.1: Ti: <0.1, and the balance is Al.

[0056] To ensure the installation stability of the sealing ring 4, in some embodiments, after the fuel outlet valve seat 2 is installed in place, the sealing ring 4 is tightly pressed from top to bottom to avoid the problem of sealing failure caused by the displacement of the sealing ring 4 during the oil blocking process. The specific pressing method is as follows. A pressing ring 21 is threadedly connected to the outer side wall of the fuel outlet valve seat 2. The pressing ring 21 is located above the installation position of the sealing ring 4. As the pressing ring 21 is loosened and tightened, the pressing ring 21 can slide along the fuel outlet valve seat 2 to approach or move away from the sealing ring 4. At the same time, a number of pressing pieces 22 are provided on the pressing ring 21, and each pressing piece 22 faces the sealing ring 4, that is, each pressing piece 22 can approach or move away from the sealing ring 4. After the fuel outlet valve seat 2 with the sealing ring 4 is installed in place on the pump body 1, the pressing ring 21 is rotated so that the pressing pieces 22 move towards the sealing ring 4 following the pressing ring 21. After the pressing pieces 22 move to press the sealing ring 4, the rotation of the pressing ring 21 is paused, thereby realizing the pressing of the sealing ring 4, ensuring the position reliability of the sealing ring 4, and thus ensuring the sealing effect of the sealing ring 4.

[0057] To install the sealing ring 4, generally a step is formed on the outer wall of the fuel outlet valve seat 2, and a limiting groove 23 is opened on the outer side wall of the step. The sealing ring 4 is sleeved in the limiting groove 23 to install the sealing ring 4, so as to ensure that when the sealing ring 4 follows the fuel outlet valve seat 2 and is inserted into the pump body 1, the sealing ring 4 will not fall off.

[0058] It should be noted that due to the existence of the step, it interferes with the pressing of the sealing ring 4 by the pressing pieces 22. Therefore, a number of vertical through holes 24 are opened on the fuel outlet valve seat 2. Specifically, the vertical through holes 24 extend from the top end surface of the step into the limiting groove 23, and the vertical through holes 24 form a communication channel between the top end surface of the step and the limiting groove 23. Each vertical through hole 24 corresponds to each pressing piece 22. Specifically, the tops of the pressing pieces 22 are installed on a rotating ring 27, and the rotating ring 27 is rotatably connected to the pressing ring 21. During the rotation of the pressing ring 21, the rotating ring 27 will not rotate, so that the pressing pieces 22 will not rotate accordingly, so that the pressing pieces 22 can pass through the vertical through holes 24 and then press the sealing ring 4.

[0059] In some embodiments, the pressing pieces 22 are evenly distributed circumferentially along the pressing ring 21, that is, the vertical through holes 24 are also evenly distributed circumferentially. In this way, each pressing ring 21 presses the sealing ring 4 with uniform force, further ensuring the position reliability of the sealing ring 4 and achieving a better sealing effect.

[0060] To facilitate the sealing ring 4 to enter the guiding groove 11, a chamfer 12 is provided at the top of the pump body 1 where the guiding groove 11 is located. The top opening of the guiding groove 11 is enlarged through this chamfer 12. Thus, when installing the oil outlet valve holder 2 with the sealing ring 4, the chamfer 12 plays a guiding role in sliding the sealing ring 4 into the guiding groove 11, further facilitating the installation of the oil outlet valve holder 2 to achieve the effect of quickly installing the fuel injection pump.

[0061] In some embodiments, the oil outlet valve holder 2 has an oil storage cavity 25, and the oil storage cavity 25 is adapted to communicate with the inner cavity of the pump body 1; and an oil injection port 26 is provided on the oil outlet valve holder 2; the pressurizing mechanism 3 is adapted to push the oil in the oil storage cavity 25 out through the oil injection port 26. This oil storage cavity 25 forms a low-pressure cavity to facilitate oil injection from the oil injection port 26.

[0062] The specific structure of the pressurizing mechanism 3 is described below. The pressurizing mechanism 3 includes an oil outlet valve spring 31, an oil outlet valve pair 32, a plunger pair 33, a plunger spring 34, a spring lower seat 35, and a tappet body 36 that are sequentially abutted from top to bottom; both the oil outlet valve pair 32 and the plunger pair 33 are hollow structures, and a plunger body 37 is sleeved inside them; the bottom of the plunger body 37 abuts against the spring lower seat 35, and the top of the plunger body 37 extends into the oil storage cavity 25; the oil outlet valve spring 31 is arranged in the oil storage cavity 25; when the tappet body 36 is pushed, the plunger body 37 pushes the oil in the oil storage cavity 25 out through the oil injection port 26.

[0063] To ensure the installation reliability of the oil outlet valve pair 32 and the plunger pair 33, a butting surface 13 is provided in the pump body 1, and this butting surface 13 is located below the plunger pair 33. When installing the oil outlet valve holder 2, the oil outlet valve holder 2 pushes the oil outlet valve pair 32 and the plunger pair 33 until the plunger pair 33 abuts against the butting surface 13 to ensure the installation reliability of the oil outlet valve pair 32 and the plunger pair 33.

[0064] In some embodiments, the oil outlet valve holder 2 is threadedly connected to the pump body 1. During the process of screwing the oil outlet valve holder 2 tightly, the oil outlet valve holder 2 pushes the plunger pair 33 through the oil outlet valve pair 32 until it abuts against the butting surface 13.

[0065] In some embodiments, a roller 38 is provided on the tappet body 36, and the roller 38 contacts the inner wall of the pump body 1. Through the setting of the roller 38, the tappet body 36 makes rolling friction with the inner wall of the pump body 1 to reduce the friction between the tappet body 36 and the inner wall of the pump body 1 and ensure the smooth movement of the plunger body 37.

[0066] In addition, at least one embodiment provides a fuel injection pump that is convenient for assembly, including a pump body 1, an outlet valve holder 2 installed on the oil outlet side of the pump body 1, and a pressurizing mechanism 3 installed in the pump body 1. After the outlet valve holder 2 is installed on the pump body 1, the outer side wall of the outlet valve holder 2 fits against the inner side wall of the pump body 1, and the oil in the pump body 1 is ejected through the outlet valve holder 2. The pressurizing mechanism 3 provides power for the oil in the pump body 1, and it can push the oil in the pump body 1 to be ejected from the outlet valve holder 2 to achieve fuel injection of the fuel injection pump. A limiting groove 23 is provided on the outer wall of the outlet valve holder 2, and a sealing ring 4 is arranged in the limiting groove 23. By providing a guiding groove 11 on the pump body 1 at the installation position of the outlet valve holder 2 with the sealing ring 4, that is, in the assembly area of the outlet valve holder 2, when the outlet valve holder 2 is installed, the guiding groove 11 provides space for the installation of the sealing ring 4, so as to facilitate the installation of the outlet valve holder 2, that is, to achieve the effect of facilitating the installation of the fuel injection pump.

[0067] All the defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed by the present disclosure for the above problems in the following text should be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0068] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0069] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0070] Based on the drawings, the components marked in the claims and in the drawings are described, and some terms in the claims are necessarily explained with reference to the drawings, especially functional names or self-defined terms, or data ranges. For example, when a temperature threshold is mentioned, the specific value should be stated in the specification.

[0071] The purpose of the explanation is to clarify the technical features, to cover the protection scope of equivalent technical features, and to highlight the working process and specific technical effects of the core utility model.

[0072] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Based on the ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A fuel injection pump convenient for assembly, characterized in that, Comprising: A pump body (1), An oil outlet valve seat (2) which is arranged on the oil outlet side of the pump body (1), and the outer wall of the oil outlet valve seat (2) fits with the inner wall of the pump body (1); A pressurizing mechanism (3) which is arranged inside the pump body (1) and is adapted to push the oil inside the pump body (1) to spray out from the oil outlet valve seat (2); A sealing ring (4) which is sleeved outside the oil outlet valve seat (2) and is adapted to seal the gap between the oil outlet valve seat (2) and the pump body (1); wherein The pump body (1) is provided with a guiding groove (11), and the guiding groove (11) is located in the assembly area between the pump body (1) and the oil outlet valve seat (2); When the oil outlet valve seat (2) is installed, the guiding groove (11) is adapted to provide a space for the sealing ring (4) to be inserted.

2. The fuel injection pump convenient for assembly according to claim 1, It is characterized in that; A tightening ring (21) is threadedly connected to the outer side wall of the oil outlet valve seat (2), and a plurality of tightening pieces (22) are arranged on the tightening ring (21); Each of the tightening pieces (22) faces the sealing ring (4); wherein After the oil outlet valve seat (2) is installed in place, rotate the tightening ring (21) so that the tightening pieces (22) move towards the sealing ring (4) and tighten it.

3. The fuel injection pump convenient for assembly according to claim 2, It is characterized in that; A limiting groove (23) is formed on the outer side wall of the oil outlet valve seat (2), and the sealing ring (4) is sleeved in the limiting groove (23); and The oil outlet valve seat (2) is provided with a plurality of vertical through holes (24), and each of the vertical through holes (24) corresponds to one of the tightening pieces (22); wherein The tightening piece (22) passes through the vertical through hole (24) and then tightens the sealing ring (4).

4. The fuel injection pump convenient for assembly according to claim 2, wherein ； Each of the tightening pieces (22) is evenly distributed circumferentially along the tightening ring (21).

5. The fuel injection pump convenient for assembly according to claim 1, wherein ； A chamfer (12) is provided at the top of the pump body (1) where the guiding groove (11) is located, and it is adapted to guide the sealing ring (4) to slide into the guiding groove (11).

6. The fuel injection pump convenient for assembly according to claim 1, It is characterized in that; The oil outlet valve seat (2) has an oil storage cavity (25), and the oil storage cavity (25) is adapted to communicate with the inner cavity of the pump body (1); and The oil outlet valve seat (2) is provided with an oil injection port (26); wherein The pressurizing mechanism (3) is adapted to push the oil in the oil storage cavity (25) to spray out from the oil injection port (26).

7. The fuel injection pump convenient for assembly according to claim 6, characterized in that; The pressurizing mechanism (3) includes an oil outlet valve spring (31), an oil outlet valve pair (32), a plunger pair (33), a plunger spring (34), a spring lower seat (35) and a tappet body (36) which are sequentially abutted from top to bottom; wherein Both the oil outlet valve pair (32) and the plunger pair (33) are of a hollow structure, and a plunger body (37) is sleeved inside them; and The bottom of the plunger body (37) abuts against the spring lower seat (35), and the top of the plunger body (37) extends into the oil storage cavity (25); The oil outlet valve spring (31) is arranged in the oil storage cavity (25); When the holding body (36) is pushed, the plunger body (37) pushes the oil in the oil storage chamber (25) to spray out from the oil injection port (26).

8. The fuel injection pump convenient for assembly according to claim 7, wherein ； The pump body (1) has an abutting surface (13) therein, which is located below the plunger pair (33); and The fuel injection valve seat (2) is threadedly connected to the pump body (1); wherein When the fuel injection valve seat (2) is tightened, the plunger pair (33) abuts against the abutting surface (13).

9. The fuel injection pump convenient for assembly according to claim 7, characterized in that ； A roller (38) is provided on the holding body (36).

10. A fuel injection pump that is convenient for assembly, characterized in that, Comprising: A pump body (1), the material of the pump body (1) is aluminum alloy, and the aluminum alloy is national standard aluminum ADC12, A fuel injection valve seat (2), the fuel injection valve seat (2) is arranged on the oil outlet side of the pump body (1), and the outer wall of the fuel injection valve seat (2) fits with the inner wall of the pump body (1); A pressurizing mechanism (3), the pressurizing mechanism (3) is arranged in the pump body (1), and is adapted to push the oil in the pump body (1) to spray out from the fuel injection valve seat (2); A sealing ring (4), which is adapted to seal the gap between the fuel injection valve seat (2) and the pump body (1); A limiting groove (23) is formed on the outer side wall of the fuel injection valve seat (2), and the sealing ring (4) is sleeved in the limiting groove (23); wherein A guiding groove (11) is formed in the pump body (1) in the assembly area with the fuel injection valve seat (2); When the fuel injection valve seat (2) is installed, the guiding groove (11) is adapted to provide a space for the sealing ring (4) to be inserted.

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