External oil pump for general gasoline engine

Abstract

The utility model relates to the technical field of gasoline engine accessories, in particular to an external oil pump for a general gasoline engine. According to the technical scheme, the oil pump comprises an oil pump middle cover located in the middle, the two ends of the oil pump middle cover are connected with a pump body and an oil pump rear cover respectively, and the pump body, the oil pump middle cover and the oil pump rear cover are fixedly connected together through main body fastening bolts. A hypocycloidal gear is installed between the interior of the pump body and the oil pump middle cover, the hypocycloidal gear and the pump body are connected together through an oil seal, a transmission pin is arranged at the central connecting position of the hypocycloidal gear and the oil pump middle cover, and a main body rotating shaft is arranged at the central position of the transmission pin. The utility model has the advantages that the structure stability is better, the matching requirement during the external use of the gasoline engine can be met, the external cooling circulation can be realized by matching with an engine oil pipeline of the gasoline engine, and the overall combination tightness during production and processing is better.

Description

Technical Field

[0001] The utility model relates to the technical field of gasoline engine accessories, in particular to an external oil pump used in a general gasoline engine. Background Art

[0002] Small general-purpose gasoline engines are usually air-cooled. In certain operating environments, the cooling effect of simple air cooling is subject to certain limitations, and the gasoline engine needs to be further cooled. The crankcase of existing small general-purpose gasoline engines uses splash lubrication, and there is no oil pump to drive the engine oil, and there is no oil pump interface, so it is impossible to output the engine oil to the outside for cooling.

[0003] The oil pumps used in small diesel engines and motorcycle engines have the same structure, but are both installed inside the crankcase. The joint surface between the pump body, pump cover and rotating shaft allows slight leakage of oil. The sealing between the connection structures is relatively poor and cannot be applied to the outside of the whole. Utility Model Content

[0004] The purpose of the utility model is to provide an external oil pump for general gasoline engines, which has a smaller overall volume and better structural stability. When in use, it can meet the coordination requirements of the gasoline engine when in external use, can cooperate with the oil pipeline of the gasoline engine to realize external cooling circulation, has better overall assembly tightness during production and processing, is more durable when in use, can ensure higher coordination efficiency during the circulation and transportation of the oil, and higher cooling efficiency.

[0005] The technical solution of the utility model is as follows:

[0006] An external oil pump for a general gasoline engine is characterized in that it includes an oil pump middle cover located in the middle position, the two ends of the oil pump middle cover are respectively connected to the pump body and the oil pump rear cover, the pump body, the oil pump middle cover and the oil pump rear cover are fixed together by main body fastening bolts, an inner cycloid wheel is installed between the interior of the pump body and the oil pump middle cover, the inner cycloid wheel and the pump body are connected together by an oil seal, a transmission pin is provided at the center connection position between the inner cycloid wheel and the oil pump middle cover, and the transmission pin is fixed together by the inner cycloid wheel and the oil pump middle cover. A main rotating shaft is provided at the center position, and the main rotating shaft passes through the center position of the pump body. The outer ring of the inner cycloid wheel and the interior of the pump body are connected and matched together through the outer cycloid wheel and the middle cover sealing gasket. The inner cycloid wheel is sleeved inside the outer cycloid wheel. A rear cover sealing gasket is provided between the oil pump middle cover and the oil pump rear cover. The outer side of the oil pump rear cover is connected to the oil outlet pipe and the oil inlet pipe through the oil pipe sealing gasket. The oil outlet pipe and the oil inlet pipe are fixed together with the oil pump rear cover by hollow bolts.

[0007] Furthermore, the outer side of the inner cycloid wheel is a cross-shaped combined structure, which is connected to the cross-shaped matching groove inside the outer cycloid wheel through the cross-shaped combined structure.

[0008] Furthermore, the oil outlet pipe and the oil inlet pipe can rotate.

[0009] Furthermore, the oil pump middle cover is provided with a positioning matching column that cooperates with the rear cover sealing gasket.

[0010] Furthermore, the rear cover sealing gasket is provided with two combined oil delivery matching holes, the oil delivery matching holes are arc-shaped structures, and the width of the middle position of the arc-shaped structure is greater than the width of the two end positions.

[0011] Beneficial effects of the utility model:

[0012] The utility model has a smaller overall volume and better structural stability. When in use, it can meet the coordination requirements of the gasoline engine during external use, and can cooperate with the oil pipeline of the gasoline engine to realize external cooling circulation. The overall combination tightness during production and processing is better, and the durability during use is stronger. It can ensure higher coordination efficiency during the circulation and transportation of the oil and higher cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 This is an overall explosion diagram of the utility model;

[0015] Figure 3 This is a schematic diagram of the oil flow of the utility model when in use;

[0016] In the figure: 1. Main body fastening bolts, 2. Pump body, 3. Oil seal, 4. Inner cycloid wheel, 5. Main body rotating shaft, 6. Transmission pin, 7. Outer cycloid wheel, 8. Middle cover gasket, 9. Oil pump middle cover, 10. Rear cover gasket, 11. Oil pump rear cover, 12. Oil pipe sealing gasket, 13. Oil outlet pipe, 14. Oil inlet pipe, 15. Hollow bolt. DETAILED DESCRIPTION

[0017] like Figures 1 to 3As shown, an external oil pump for a general gasoline engine includes an oil pump middle cover 9 located in the middle position, and the two ends of the oil pump middle cover 9 are respectively connected to the pump body 2 and the oil pump rear cover 11. The pump body 2, the oil pump middle cover 9 and the oil pump rear cover 11 are fixed together by the main body fastening bolts 1. A hypocycloid wheel 4 is installed between the interior of the pump body 2 and the oil pump middle cover 9. The hypocycloid wheel 4 and the pump body 2 are connected together by an oil seal 3. A transmission pin 6 is provided at the center connection position of the hypocycloid wheel 4 and the oil pump middle cover 9. The center position of the transmission pin 6 is set There is a main rotating shaft 5, which passes through the center of the pump body 2. The outer ring of the inner cycloid wheel 4 is connected to the interior of the pump body 2 through the outer cycloid wheel 7 and the middle cover gasket 8. The inner cycloid wheel 4 is mounted inside the outer cycloid wheel 7. A rear cover gasket 10 is provided between the oil pump middle cover 9 and the oil pump rear cover 11. The outer position of the oil pump rear cover 11 is connected to the oil outlet pipe 13 and the oil inlet pipe 14 through the oil pipe sealing gasket 12. The oil outlet pipe 13 and the oil inlet pipe 14 are fixed to the oil pump rear cover 11 by hollow bolts 15. It has a smaller overall volume and better structural stability. When used, it can meet the requirements of external use of gasoline engines and can cooperate with the oil pipeline of gasoline engines to realize external cooling circulation. The overall assembly is more compact during production and processing, and the durability is stronger during use. It can ensure higher coordination efficiency and higher cooling efficiency during oil circulation and transportation. When in use, the rotating shaft 5 rotates so that the volume of the tooth space where the dynamic inner cycloid wheel 4 and the outer cycloid wheel 7 mesh with each other changes, so that the pressure of the space A of the oil pump cover 9 is greater than the pressure of the space B, driving the oil into the oil pump from the oil inlet pipe 14 and out of the oil pump from the oil outlet pipe (13), thereby realizing the flow of oil in the entire pipeline system.

[0018] Preferably, the outer side of the inner cycloid wheel 4 is a cross-shaped combination structure, which is connected to the cross-shaped matching groove inside the outer cycloid wheel 7 through the cross-shaped combination structure. The matching stability during use is better, the mutual matching bearing capacity during rotation is stronger, and the durability during use is better.

[0019] Preferably, the oil outlet pipe 13 and the oil inlet pipe 14 can rotate, which makes the installation and connection operations more convenient during use, and is more convenient when combined, which can ensure higher matching efficiency during assembly, and can be moved as needed during use, thereby improving safety during transportation.

[0020] Preferably, the oil pump middle cover 9 is provided with a positioning matching column that cooperates with the rear cover sealing gasket 10, which has better sealing performance during assembly, higher matching efficiency during connection and installation, and can further improve the connection strength between them.

[0021] Preferably, two combinations of oil circuit delivery matching holes are provided on the rear cover sealing gasket 10. The oil circuit delivery matching holes are arc-shaped structures, and the width of the middle position of the arc-shaped structure is greater than the width of the two end positions. When the oil circuit is delivered, the smoothness of the delivery process can be ensured to be better, and at the same time, the structural strength of this component can be higher and the durability during use can be stronger.

[0022] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements or substitutions can be made without departing from the principles described in the present invention. These improvements or substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An external oil pump for a general gasoline engine, characterized by: The invention comprises an oil pump middle cover (9) located in the middle position, wherein the two ends of the oil pump middle cover (9) are respectively connected to a pump body (2) and an oil pump rear cover (11), wherein the pump body (2), the oil pump middle cover (9) and the oil pump rear cover (11) are fixedly connected together by a main body fastening bolt (1), an inner cycloid wheel (4) is installed between the interior of the pump body (2) and the oil pump middle cover (9), and the inner cycloid wheel (4) and the pump body (2) are connected together by an oil seal (3), a transmission pin (6) is provided at the center connection position of the inner cycloid wheel (4) and the oil pump middle cover (9), and a main body rotating shaft (5) is provided at the center position of the transmission pin (6), and the main body The rotating shaft (5) passes through the center position of the pump body (2), the outer ring of the inner cycloid wheel (4) and the interior of the pump body (2) are connected and matched together through the outer cycloid wheel (7) and the middle cover sealing gasket (8), the inner cycloid wheel (4) is sleeved inside the outer cycloid wheel (7), a rear cover sealing gasket (10) is provided between the oil pump middle cover (9) and the oil pump rear cover (11), the outer position of the oil pump rear cover (11) is connected to the oil outlet pipe (13) and the oil inlet pipe (14) through the oil pipe sealing gasket (12), and the oil outlet pipe (13) and the oil inlet pipe (14) are fixed together with the oil pump rear cover (11) through a hollow bolt (15).

2. The external oil pump for a general gasoline engine according to claim 1, characterized in that: The outer side of the inner cycloid wheel (4) is a cross-shaped combined structure, and the cross-shaped combined structure and the cross-shaped matching groove inside the outer cycloid wheel (7) are matched and connected together.

3. The external oil pump for a general gasoline engine according to claim 1, characterized in that: The oil outlet pipe (13) and the oil inlet pipe (14) can rotate.

4. The external oil pump for a general gasoline engine according to claim 1, characterized in that: The oil pump middle cover (9) is provided with a positioning matching column that matches the rear cover sealing gasket (10).

5. The external oil pump for a general gasoline engine according to claim 1, characterized in that: The rear cover sealing gasket (10) is provided with two combined oil channel delivery matching holes, the oil channel delivery matching holes are arc-shaped structures, and the width of the middle position of the arc-shaped structure is greater than the width of the two end positions.

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