Oil pump structure, methanol engine and vehicle

Abstract

The utility model relates to the technical field of engines, and discloses an oil pump structure, a methanol engine and a vehicle. The bushing is arranged outside the plunger in a sleeving manner and is in clearance fit with the plunger, and an annular caulking groove is formed in the inner wall of the bushing; and the sealing ring is embedded in the L-shaped embedding groove and is in interference fit with the plunger. The annular caulking groove is formed in the inner wall of the bushing, the sealing ring is embedded in the annular caulking groove, the sealing ring is in a static state in the working process of the oil pump, compared with the mode that the sealing ring is arranged in the caulking groove of the plunger and moves along with the plunger in the related technology, the sealing ring does not move relative to the bushing any more, abrasion to the bushing is avoided, and the oil supply efficiency is effectively improved; and the alcohol resistance of the high-pressure oil pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an oil pump structure, a methanol engine and a vehicle. Background Art

[0002] At present, methanol vehicles use the technical solution of multi-point injection in the intake manifold. However, as users have higher and higher requirements for fuel economy and emission regulations are becoming more and more stringent, the technical innovation of the methanol supply system is becoming more urgent. The direct injection technology has been verified in the field of gasoline engines and has obvious effects on economy and emission improvement. Therefore, the direct injection methanol engine is a development direction with great development prospects.

[0003] The methanol high-pressure oil pump provides the methanol injector with methanol at the required pressure to meet the engine performance requirements. The structure of the high-pressure oil pump in the related technology is as follows Figure 1-Figure 4 As shown, the bushing 200 is sleeved on the plunger 100, and the plunger 100 is provided with an embedding groove for installing the sealing ring 300. The sealing ring 300 is arranged in the embedding groove and reciprocates with the plunger 100. The sealing ring 300 and the bushing 200 are interference-fitted and move along the inner wall of the bushing 200 throughout the entire stroke, and motion friction is generated with the entire inner wall surface of the bushing 200 during the process. Due to the special physical and chemical properties of methanol, the lubricity is worse than that of gasoline, and it has a certain degree of corrosiveness. Therefore, when the methanol high-pressure oil pump is working, the bushing 200 will be severely worn, resulting in a decrease in the oil supply efficiency of the high-pressure oil pump. Utility Model Content

[0004] In view of this, the utility model provides an oil pump structure, a methanol engine and a vehicle to solve the problem that methanol has corrosiveness and low lubricity, which causes the bushing of the methanol high-pressure oil pump to be easily worn.

[0005] In a first aspect, the utility model provides an oil pump structure, comprising:

[0006] Plunger;

[0007] A bushing is sleeved outside the plunger and is in clearance fit with the plunger, and an annular groove is provided on the inner wall of the bushing;

[0008] The sealing ring is embedded in the annular embedding groove and has an interference fit with the plunger.

[0009] Beneficial effect: an annular groove is provided on the inner wall of the bushing, and the sealing ring is embedded in the annular groove. During the operation of the oil pump, the sealing ring is in a stationary state. Compared with the method in the related art in which the sealing ring is arranged in the groove of the plunger and moves with the plunger, the sealing ring no longer moves relative to the bushing, thereby avoiding wear on the bushing, effectively improving the oil supply efficiency, and improving the alcohol resistance of the high-pressure oil pump.

[0010] In an optional embodiment, the interference fit between the plunger and the sealing ring is 0.03 mm to 0.15 mm.

[0011] Beneficial effect: If the interference is too large, the wear of the sealing ring will increase and the sealing reliability will be affected. If the interference is too small, the tightness of the fit between the sealing ring and the plunger will be affected, and leakage may occur during the reciprocating motion of the plunger. Setting the interference within a reasonable range of 0.03mm to 0.15mm can not only ensure the smooth movement of the plunger and reduce the wear on the sealing ring, but also ensure the tightness of the fit between the sealing ring and the plunger, thereby ensuring the reliability of the sealing ring.

[0012] In an optional embodiment, the fitting clearance between the plunger and the bushing is in the range of 0.002 mm to 0.009 mm.

[0013] Beneficial effect: The plunger and the bushing are matched one-to-one and honed to ensure the matching clearance between the plunger and the bushing. If the clearance between the two is too large, there may be a risk of leakage, and if the clearance is too small, it will affect the assembly. The matching clearance between the plunger and the bushing is controlled within the range of 0.002mm to 0.009mm, which ensures the matching clearance while avoiding leakage.

[0014] In an optional embodiment, the annular groove is opened at the upper part or the lower part of the bushing.

[0015] Beneficial effect: compared with the method of opening the annular groove in the middle of the bushing, the annular groove is opened at the upper or lower part of the bushing, and the processing is more convenient and the production efficiency is higher when it is close to the edge of the bushing.

[0016] In an optional embodiment, a lubricating layer is provided on the outer surface of the plunger.

[0017] Beneficial effect: After the lubricating layer is provided on the outer surface of the plunger, the smooth contact surface reduces the movement friction between the plunger and the sealing ring, reduces the wear of the plunger on the sealing ring, and further improves the reliability of the sealing ring.

[0018] In an optional embodiment, the plunger includes a mating segment corresponding to the bushing, and the lubricating layer is coated on at least an outer surface of the mating segment.

[0019] Beneficial effect: The lubricating layer is coated at least on the matching section of the plunger, ensuring that the part of the plunger in contact with the sealing ring during movement is provided with the lubricating layer, thereby minimizing the wear on the sealing ring and ensuring the sealing performance.

[0020] In an optional embodiment, the lubricating layer is a DLC coating or a ta-C coating.

[0021] Beneficial effects: Both DLC coating and ta-C coating have good lubricity and high hardness. When DLC coating or ta-C coating is applied on the contact surface between the plunger and the sealing ring, the lubricating layer reduces friction when the plunger moves relative to the sealing ring.

[0022] In a second aspect, the utility model further provides a methanol engine, comprising the oil pump structure described in any one of the above items.

[0023] Beneficial effect: After the methanol engine is provided with the oil pump structure of the utility model, the sealing ring no longer moves relative to the bushing during the operation of the oil pump, thereby avoiding wear on the bushing and effectively improving the oil supply efficiency. Such a setting improves the alcohol resistance of the high-pressure oil pump, improves the economy of the methanol engine, and improves the emission effect.

[0024] In an optional embodiment, the engine is a direct injection methanol engine.

[0025] Beneficial effects: The use of direct-injection methanol engines effectively improves the economy of methanol engines, improves the emissions of methanol engines, and creates conditions for the widespread application of methanol engines.

[0026] In a third aspect, the utility model also provides a vehicle, comprising the above-mentioned methanol engine.

[0027] Beneficial effect: The vehicle includes a methanol engine, which has the same technical effect as the methanol engine, and will not be described in detail here. After the economy of the methanol engine is improved and the emission effect is improved, the overall performance of the methanol fuel vehicle is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the related technologies, the drawings required for use in the specific implementation methods or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a cross-sectional structural diagram of an oil pump structure in the related art;

[0030] Figure 2 for Figure 1 Schematic diagram of the matching state of the middle plunger and the sealing ring;

[0031] Figure 3 It is a cross-sectional view of the assembly structure of a high-pressure oil pump in the related art;

[0032] Figure 4 for Figure 3A partial enlarged structural diagram of part A;

[0033] Figure 5 A cross-sectional structural diagram of an oil pump structure according to an embodiment of the utility model;

[0034] Figure 6 for Figure 5 Schematic diagram of the matching state of the middle bushing and the sealing ring;

[0035] Figure 7 A cross-sectional view of the assembly structure of a high-pressure oil pump according to an embodiment of the utility model;

[0036] Figure 8 for Figure 7 A partial enlarged structural diagram of part B.

[0037] Description of reference numerals:

[0038] 100. Plunger;

[0039] 200, bushing;

[0040] 300, sealing ring;

[0041] 400, pump body;

[0042] 500, oil outlet;

[0043] 600, thrust frame;

[0044] 1. Plunger;

[0045] 2. Bushing;

[0046] 3. Sealing ring;

[0047] 4. Pump body;

[0048] 5. Oil outlet;

[0049] 6. Thrust bracket. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0051] In the description of the utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply 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 limiting the utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0053] Combine the following Figures 5 to 8 , describing an embodiment of the utility model.

[0054] According to an embodiment of the present utility model, on the one hand, as Figure 5 As shown, an oil pump structure is provided, comprising:

[0055] Plunger 1;

[0056] The bushing 2 is sleeved outside the plunger 1 and is loosely matched with the plunger 1, and an annular groove is formed on the inner wall of the bushing 2;

[0057] The sealing ring 3 is embedded in the annular groove and has an interference fit with the plunger 1 .

[0058] The matching state of the sealing ring 3 and the bushing 2 is shown in Figure 6 .

[0059] An annular groove is provided on the inner wall of the bushing 2, and the sealing ring 3 is embedded in the annular groove. During the operation of the oil pump, the sealing ring 3 is in a stationary state. Compared with the method in the related art in which the sealing ring 3 is arranged in the groove of the plunger 1 and moves with the plunger 1, the sealing ring 3 no longer moves relative to the bushing 2, thereby avoiding wear on the bushing 2, effectively improving the oil supply efficiency, and improving the alcohol resistance of the high-pressure oil pump.

[0060] In an optional embodiment, the interference fit between the plunger 1 and the sealing ring 3 is 0.03 mm to 0.15 mm.

[0061] It should be noted that if the interference is too large, the wear of the sealing ring 3 will increase and the sealing reliability will be affected, while if the interference is too small, the tightness of the fit between the sealing ring 3 and the plunger 1 will be affected, and fuel leakage may occur during the reciprocating motion of the plunger 1. Setting the interference within a reasonable range of 0.03mm to 0.15mm can not only ensure the smooth movement of the plunger 1 and reduce the wear on the sealing ring 3, but also ensure the tightness of the fit between the sealing ring 3 and the plunger 1, thereby ensuring the sealing reliability of the sealing ring 3.

[0062] In an optional embodiment, the gap between the plunger 1 and the bushing 2 is in the range of 0.002 mm to 0.009 mm.

[0063] The plunger 1 and the bushing 2 are honed and matched one-to-one to ensure the matching clearance between the plunger 1 and the bushing 2. If the clearance between the two is too large, there may be a risk of leakage, and if the clearance is too small, it will affect the assembly. The matching clearance between the plunger 1 and the bushing 2 is controlled within the range of 0.002mm to 0.009mm to ensure the matching clearance and avoid leakage.

[0064] Specifically, the annular embedding groove is opened at the upper part or the lower part of the bushing 2 .

[0065] The annular groove is opened at the upper part or the lower part of the bushing 2. Compared with the method of opening it in the middle part of the bushing 2, it is more convenient to process when it is close to the edge of the bushing 2 and the production efficiency is higher.

[0066] In an optional embodiment, the outer surface of the plunger 1 is provided with a lubricating layer.

[0067] After the lubricating layer is provided on the outer surface of the plunger 1 , the smooth contact surface reduces the movement friction between the plunger 1 and the sealing ring 3 , reduces the wear of the plunger 1 on the sealing ring 3 , and further improves the reliability of the sealing ring 3 .

[0068] In an optional embodiment, the plunger 1 includes a matching section corresponding to the bushing 2, and the lubricating layer is coated on at least the outer surface of the matching section.

[0069] A lubricating layer is coated at least on the fitting section of the plunger 1 to ensure that the part of the plunger 1 in contact with the sealing ring 3 during movement is provided with the lubricating layer, thereby minimizing the wear on the sealing ring 3 and ensuring the sealing performance.

[0070] If the lubricating layer is only applied to the fitting section of the plunger 1, the processing efficiency can be improved while materials can be saved, thereby reducing costs.

[0071] In an optional embodiment, the lubricating layer is a DLC coating or a ta-C coating.

[0072] Both the DLC coating and the ta-C coating have good lubricity and high hardness. The DLC coating or the ta-C coating is applied to the contact mating surface between the plunger 1 and the sealing ring 3. When the plunger 1 moves relative to the sealing ring 3, the lubricating layer plays a role in reducing friction.

[0073] DLC (Diamond Like Carbon) coating, that is, diamond-like carbide coating, has both the high hardness of diamond and the lubricity of graphite. It is an amorphous coating film composed of carbon and hydrogen. DLC is mainly synthesized at a temperature of 100℃ to 300℃ using PVD (Physical Vapor Deposition, a physical vapor deposition technology, mainly used in surface treatment, including coating, etc.) process or PACVD (Plasma-Assisted Chemical Vapor Deposition, plasma-assisted chemical vapor deposition) process. It has good wear resistance, lubricity, electrical insulation, chemical stability and light transmittance. The coating can cover iron or non-ferrous metals, plastics, ceramics, etc.

[0074] ta-C (Tetrahedral Amorphaous Carbon) coating, also known as hydrogen-free DLC coating. Compared with other DLC coatings, ta-C coating has higher hardness and temperature resistance, and can significantly reduce the friction coefficient.

[0075] like Figure 1-Figure 4 In the related art shown, when the oil pump is working, the sealing ring 300 moves with the plunger 100 in interference relative to the bushing 200. The sealing ring 300 and the bushing 200 reciprocate in the interference state in the methanol environment. Due to the poor lubricity of methanol, the bushing 200 wears and causes the oil supply efficiency of the high-pressure oil pump to drop significantly during operation.

[0076] The utility model provides a high-pressure oil pump structure, see Figure 5-Figure 8 The high-pressure oil pump includes a pump body 4 and a plunger 1, a bushing 2 and a sealing ring 3 arranged in the pump body 4. The pump body 4 has an oil inlet and an oil outlet 5. A thrust frame 6 is arranged on the bottom side of the plunger 1. The bushing 2 sleeved on the plunger 1 is installed in the cavity of the pump body 4 with interference fit, and the sealing ring 3 is installed in the annular groove of the bushing 2. During the operation of the high-pressure oil pump, the sealing ring 3 is in a stationary state, and the plunger 1 and the sealing ring 3 move relative to each other with interference fit. The DLC coating is added to the surface of the plunger 1 to reduce the wear of the plunger 1 on the sealing ring 3. The sealing ring 3 and the plunger 1 maintain an interference amount of 0.05mm to 0.15mm, and the bushing 2 and the plunger 1 maintain a gap of 0.002mm to 0.009mm.

[0077] The methanol high-pressure oil pump (oil pump before optimization) in the related art and the methanol high-pressure oil pump (oil pump after optimization) of the utility model were subjected to the 600H engine bench methanol durability test under the same test conditions. The performance test showed that the fuel supply efficiency of the high-pressure oil pump before optimization at 3000rpm decreased by nearly 8%, and the fuel supply efficiency of the high-pressure oil pump after optimization decreased by 1%. The fuel supply efficiency of the high-pressure oil pump after optimization increased by 7% after durability compared with the high-pressure oil pump before optimization. The pressure building capacity of the high-pressure oil pump after optimization was tested 6 times at 70rpm compared with the high-pressure oil pump before optimization, and the pressure building capacity increased by 6%, see Table 1.

[0078] Table 1

[0079]

[0080] It should be noted that the new oil pump in Table 1 refers to a new oil pump that has just been put into use, and the durable oil pump refers to an oil pump that has been used for a period of time.

[0081] It can be seen that the use of the high-pressure oil pump of the utility model effectively improves the oil supply efficiency.

[0082] According to an embodiment of the present utility model, on the other hand, a methanol engine is provided, including an oil pump structure.

[0083] After the methanol engine is provided with the oil pump structure of the utility model, the sealing ring 3 no longer moves relative to the bushing 2 during the operation of the oil pump, thereby avoiding wear on the bushing 2 and effectively improving the oil supply efficiency. Such a setting improves the alcohol resistance of the high-pressure oil pump, improves the economy of the methanol engine, and improves the emission effect.

[0084] It should be noted that the engine is a direct-injection methanol engine.

[0085] The use of direct-injection methanol engines has effectively improved the economy of methanol engines, improved the emissions of methanol engines, and created conditions for the widespread application of methanol engines.

[0086] According to an embodiment of the present utility model, in another aspect, a vehicle is provided, comprising a methanol engine.

[0087] The vehicle includes a methanol engine, which has the same technical effects as the methanol engine, and will not be described in detail here. After the economy of the methanol engine is improved and the emission effect is improved, the overall performance of the methanol fuel vehicle is improved.

[0088] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An oil pump structure, characterized in that: include: Plunger (1); A bushing (2) is sleeved outside the plunger (1) and is clearance-matched with the plunger (1), and an annular embedding groove is provided on the inner wall of the bushing (2); A sealing ring (3) is embedded in the annular groove and has an interference fit with the plunger (1); The outer surface of the plunger (1) is provided with a lubricating layer, and the lubricating layer is a DLC coating or a ta-C coating.

2. The oil pump structure according to claim 1, characterized in that: The interference fit between the plunger (1) and the sealing ring (3) is 0.03 mm to 0.15 mm.

3. The oil pump structure according to claim 1, characterized in that: The matching clearance between the plunger (1) and the bushing (2) is in the range of 0.002 mm to 0.009 mm.

4. The oil pump structure according to claim 1, characterized in that: The annular embedding groove is provided at the upper part or the lower part of the bushing (2).

5. The oil pump structure according to any one of claims 1 to 4, characterized in that: The plunger (1) comprises a matching section corresponding to the bushing (2), and the lubricating layer is coated on at least the outer surface of the matching section.

6. A methanol engine, characterized in that: The invention comprises the oil pump structure according to any one of claims 1 to 5.

7. The methanol engine according to claim 6, characterized in that: The engine is a direct-injection methanol engine.

8. A vehicle, characterized in that: Including the methanol engine as described in claim 6 or 7.

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