Multi-layer oil pump structure of pedal motorcycle

Abstract

The utility model provides a multilayer oil pump structure of a pedal motorcycle. The multilayer oil pump structure mainly comprises a shell I (1), a shell II (2), a shell III (3), a bottom cover (4), a driven chain wheel (5), an oil pump shaft (6), an inner rotor (7) and an outer rotor (8), the oil pump structure is characterized by being divided into three layers, each layer is provided with a shell (1-3), each shell (1-3) is provided with a pump cavity (9), each pump cavity (9) is internally provided with a group of eccentric inner and outer rotors (7 and 8) which are meshed and fixed in the pump cavity (9) and a bottom cover (4) for fixing the inner and outer rotors (7 and 8) at the bottommost layer in the pump cavity (9), and each layer of shell (1-3) and the bottom cover (4) are concentric according to a shaft hole (10), are provided with a positioning pin I (11) for positioning and are longitudinally and sequentially mounted. The shell I (1) is connected with the bottom cover (4) through a locking bolt (13) penetrating through the shell (1-3) and the bottom cover (4), and the locking bolt (13) is connected and locked with a matched internal threaded hole (14) formed in the shell I (1); an oil pump shaft (6) penetrates between the shell (1-3) and the bottom cover (4), each layer of meshing rotors (7 and 8) are connected in series, three pin holes (15) are formed in the shaft (6), a first cylindrical pin (16) passes through the pin holes (15), a rectangular groove (17) is formed in the center of each inner rotor (7), and the first cylindrical pins (16) penetrate through the oil pump shaft (6) to be installed in the rectangular grooves (17); each layer of shell is provided with a corresponding oil outlet channel (18) and an oil inlet channel (19) which are connected with different oil ways of an engine; five working cavities (20) are formed between the inner rotor (7) and the outer rotor (8), and the volumes of the five working cavities (20) change continuously. In the cavity on one side of the oil inlet cavity, as the rotors (7 and 8) are disengaged, the volume is gradually increased, the pressure is gradually reduced, and engine oil is sucked in. The engine oil rotates and flows along with the rotors (7 and 8) and is brought to one side of an oil outlet cavity, at the moment, the rotors (7 and 8) are in an engaged state, the volume is reduced, the oil pressure is increased, and the engine oil is extruded out of working cavities (20) of the rotors (7 and 8), enters the oil outlet cavity and is sent out.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle oil pumps, in particular to a multi-layer oil pump structure for a pedal motorcycle. Background Art

[0002] With the development of technology, the structure of scooter engines is becoming more and more complex and the technology is becoming more and more advanced. There are structures and technologies such as dry crankshaft chambers and gear chambers connected to the engine case oil circuit. The oil pump is required to not only realize the function of supplying oil to the oil circuit, that is, to continuously deliver sufficient, clean and temperature-appropriate lubricating oil to the working surface of the friction parts at a certain pressure when the engine is working. It is also necessary to quickly pump the oil in the crankshaft chamber into the case oil pool to make the crankshaft chamber in a dry state. After the gear chamber is connected to the engine case oil circuit, the gear chamber is continuously sprayed with oil. At this time, a group of oil pumps is required to pump the increasing oil in the gear chamber back to the case oil pool, and then circulate it through the lubrication system. In order to realize the above three functions at the same time, three independent oil pumps are required to work at the same time. Three independent single-layer oil pumps require three sets of drive mechanisms to drive the oil pumps to work, which not only generates greater power consumption, but also requires a larger and more complex assembly space. Make the engine larger and more difficult to layout. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a multi-layer oil pump structure for a scooter, which has a large oil flow rate and a compact structure, and connects different oil circuits of the engine in layers to achieve precise point-to-point lubrication, cooling and cleaning.

[0004] The utility model discloses a multi-layer oil pump structure for a scooter, mainly comprising a housing 1, a housing 2, a housing 3, a bottom cover 4, a driven sprocket 5, an oil pump shaft 6, an inner rotor 7, and an outer rotor 8; the characteristic is that the oil pump structure is divided into three layers; each layer is provided with housings 1-3, each housing 1-3 is provided with a pump cavity 9, each pump cavity 9 is provided with a group of eccentrically arranged inner rotors 7, outer rotors 8 meshing and fixed in the pump cavity 9, and the bottom cover 4 that fixes the inner rotor 7 and outer rotor 8 of the bottom layer in the pump cavity 9, each layer of housings 1-3 is concentric with the bottom cover 4 according to the shaft hole 10, is provided with a positioning pin 11 for positioning, and is installed in sequence longitudinally, through The locking bolt 13 passing through the housing 1-3 and the bottom cover 4 is connected, and the locking bolt 13 is connected and locked with the matching internal threaded hole 14 provided in the housing 1; the oil pump shaft 6 passes through the housing 1-3 and the bottom cover 4, and is connected in series with each layer of meshing rotors. Three pin holes 15 are provided on the shaft 6 to pass through the cylindrical pin 16, and a rectangular groove 17 is provided in the center of each of the three inner rotors 7. The cylindrical pin 16 passes through the oil pump shaft 6 and is installed in the rectangular groove 17; each layer of the housing is provided with a corresponding oil outlet 18 and an oil inlet 19 to connect different oil circuits of the engine; five working chambers 20 are formed between the inner rotor 7 and the outer rotor 8, and the volume of the five working chambers 20 changes continuously. The cavity on one side of the oil inlet chamber gradually increases and the pressure gradually decreases as the rotor disengages from the meshing, and the oil is sucked in. The oil flows with the rotation of the rotor and is brought to the side of the oil outlet chamber. At this time, the rotor is in the meshing state, the volume decreases, the oil pressure increases, and the oil is squeezed out of the rotor working chamber 20 and sent out into the oil outlet chamber.

[0005] The multi-layer oil pump structure of the scooter is characterized in that: the oil pump structure is divided into three layers, each layer is provided with a pair of inner rotor 7 and outer rotor 8 that mesh with each other. The multi-layer oil pump structure of the scooter is characterized in that: the oil pump housing 1-3 is provided with a pump cavity 9, the housing 1-3 and the bottom cover 4 together form a three-layer surrounding pump cavity 9, and the meshing rotor group is installed in the pump cavity 9.

[0006] The multi-layer oil pump structure of the scooter is characterized in that the three-layer shell 1-3 is concentric with the bottom cover 4 through the axial hole 10, the positioning pin 11 is positioned, and they are installed in sequence longitudinally. The shell 1 is provided with an internal threaded hole 14, and the multi-layer shell 1-3 is locked by the locking bolt 13 that runs through the bottom cover 4 and the shell 1-3.

[0007] The multi-layer oil pump structure of the scooter is characterized in that the housing 1-3 and the bottom cover 4 are provided with an oil outlet passage 18 and an oil inlet passage 19, which are directly connected to the box oil passage and the main oil pool. The volume of the working chamber changes through the movement of the rotor, and the oil passage transports the oil in and out of the oil pump.

[0008] The multi-layer oil pump structure of the scooter is characterized in that the housing 1-3 and the bottom cover 4 are provided with a through hole for the shaft of the driving rotor group to pass through the housing 1-3 and the bottom cover 4.

[0009] The multi-layer oil pump structure of the scooter is characterized in that: a through hole for passing the shaft of the driving rotor group is provided in the center of the three inner rotors 7, and each is provided with a rectangular groove 17, a cylindrical pin 16 passes through the oil pump shaft 6 and is installed in the rectangular groove 17, and the oil pump shaft 6 passes through the shaft hole 10 to connect the three inner rotors 7.

[0010] The multi-layer oil pump structure of the scooter is characterized in that the oil pump shaft 6 runs through the housing 1-3 and the bottom cover 4, and the shaft body 6 is provided with three pin holes 15 for driving the rotor groups 7 and 8 to move through a cylindrical pin 16.

[0011] The multi-layer oil pump structure of the scooter is characterized in that a positioning pin 12 and a rubber sealing ring 22 are provided at the connection between the housing 1-3 and the oil passage of the engine case for positioning the oil passage installation and sealing the oil passage.

[0012] The multi-layer oil pump structure of the scooter is characterized in that the oil pump is directly connected to the crankshaft through the driven sprocket 5 which is interference-fitted with the shaft 6, and the oil pump chain is directly connected to the crankshaft and driven directly by the crankshaft. This pump has a simple structure and high oil pumping efficiency, and can provide the engine with sufficient pressurized oil to ensure the lubrication of the engine. Secondly, the structure of the inner rotor 7 and the outer rotor 8 adopts an internal meshing gear transmission structure with a difference of one tooth, and there is a certain eccentricity between the inner rotor 7 and the outer rotor 8. No matter what angle the rotor rotates to, point contact can always be formed on the tooth profile line of each tooth of the inner rotor 7 and the outer rotor 8. Because the oil inflow is sufficient, and the centrifugal force generated by the high-speed rotation of the rotor not only does not hinder the oil inflow, but on the contrary increases the oil filling between the teeth, avoids the occurrence of cavitation, and reduces the power consumption loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic structural diagram of a multi-layer oil pump for a scooter described in an embodiment of the utility model.

[0015] Figure 2 It is a schematic diagram of the exploded structure of a multi-layer oil pump for a scooter described in an embodiment of the utility model.

[0016] Figure 3 It is a schematic diagram of the structure of a multi-layer oil pump rotor for a scooter described in an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The specific structure of the embodiment of the utility model is further described below in conjunction with the accompanying drawings.

[0018] Referring to the accompanying drawings, a multi-layer oil pump structure for a scooter includes a housing 1, a housing 2, a housing 3, a bottom cover 4, a driven sprocket 5, an oil pump shaft 6, an inner rotor 7, an outer rotor 8, a thrust washer 23, a cylindrical pin 16, a cylindrical pin 24, a positioning pin 11, and a positioning pin 22; its characteristics include: the oil pump structure is divided into three layers; each layer is provided with housings 1-3, the housings 1-3 are provided with pump chambers 9, the pump chambers 9 are provided with a group of eccentrically arranged inner rotors 7, outer rotors 8 meshing and fixed in the pump chambers 9, and the bottom cover 4 that fixes the inner rotors 7 and outer rotors 8 in the bottom layer in the pump chambers 9, and each layer of the housings 1-3 and the bottom cover 4 are provided. The cover 4 is concentric with the shaft hole 10, and is provided with a locating pin 11 and a locating pin 2 12 for positioning. It is installed longitudinally in sequence and connected by a locking bolt 13 that passes through the housing 1~3 and the bottom cover 4. The bolt 13 is connected and locked with a matching internal threaded hole 14 provided in the housing 1; the oil pump shaft 6 passes through the housing 1~3 and the bottom cover 4, and each layer of meshing rotors is connected in series. Three pin holes 15 are provided on the shaft 6 through which a cylindrical pin 16 passes. A rectangular groove 17 is provided in the center of each of the three inner rotors 7. The cylindrical pin 16 passes through the oil pump shaft 6 and is installed in the rectangular groove 17; each layer of the housing 1~3 is provided with a corresponding oil outlet and oil inlet, which connects different oil circuits of the engine.

[0019] Five working chambers 20 are formed between the inner and outer rotors. As the volumes of the five working chambers 20 change continuously, the cavity on the oil inlet side is empty. As the rotors are disengaged, the volume gradually increases, a vacuum is generated, and the oil is sucked in. As the rotors rotate and flow, the oil is brought to the oil outlet side. At this time, the rotors are in meshing state, the volume decreases, the oil pressure increases, and the oil is squeezed out of the rotor working chamber 20 and sent out into the oil outlet.

[0020] The multi-layer oil pump structure of the scooter is characterized in that the oil pump structure is divided into three layers, and each layer is provided with a pair of inner rotor 7 and outer rotor 8 that work in meshing.

[0021] The multi-layer oil pump structure of the scooter is characterized in that the three-layer shell 1-3 is concentric with the bottom cover 4 through the axial hole 10, the positioning pin 11 is positioned, and they are installed in sequence longitudinally. The shell 1 is provided with an internal threaded hole 14, and the multi-layer shell 1-3 is locked by the locking bolt 13 that runs through the bottom cover 4 and the shell 1-3.

[0022] The multi-layer oil pump structure of the scooter is characterized in that the housing 1-3 and the bottom cover 4 are provided with an oil outlet passage 18 and an oil inlet passage 19, which are directly connected to the box oil passage and the main oil pool. The volume of the working chamber 20 changes through the movement of the rotor, and the oil passage transports the oil in and out of the oil pump.

[0023] The multi-layer oil pump structure of the scooter is characterized in that: a through hole for passing the shaft of the driving rotor group is provided in the center of the three inner rotors 7, and each is provided with a rectangular groove 17, a cylindrical pin 16 passes through the oil pump shaft 6 and is installed in the rectangular groove 17, and the oil pump shaft 6 passes through the shaft through hole to connect the three inner rotors 7.

[0024] The multi-layer oil pump structure of the scooter is characterized in that the oil pump is directly connected to the crankshaft through the driven sprocket 5 which is interference-fitted with the shaft 6, and the oil pump chain is directly connected to the crankshaft and driven directly by the crankshaft. This pump has a simple structure and high oil pumping efficiency, and can provide the engine with sufficient pressurized oil to ensure the lubrication of the engine. Secondly, the structure of the inner rotor 7 and the outer rotor 8 adopts an internal meshing gear transmission structure with a difference of one tooth, and there is a certain eccentricity between the inner rotor 7 and the outer rotor 8. No matter what angle the rotor rotates to, point contact can always be formed on the tooth profile line of each tooth of the inner rotor 7 and the outer rotor 8. Because the oil inflow is sufficient, and the centrifugal force generated by the high-speed rotation of the rotor not only does not hinder the oil inflow, but on the contrary increases the filling between the teeth, avoids the occurrence of cavitation, and reduces the power consumption loss.

[0025] The above is only a preferred embodiment of the utility model, and does not limit the structure of the utility model in any form. Any simple modification and equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model still fall within the scope of the technical solution of the utility model.

Claims

1. A multi-layer oil pump structure for a scooter, comprising a housing 1, a housing 2, a housing 3, a bottom cover, a driven sprocket, an oil pump shaft, an inner rotor, an outer rotor, a thrust washer, a cylindrical pin 1, a cylindrical pin 2, a positioning pin 1, a positioning pin 2, and a locking bolt, wherein: The oil pump structure is divided into three layers, each layer is provided with a shell, the shell is provided with a pump cavity, the pump cavity is provided with a group of eccentrically arranged inner and outer rotors meshing and fixed in the pump cavity, and a bottom cover is provided to fix the inner and outer rotors of the bottom layer in the pump cavity, each layer of the shell and the bottom cover are provided with an axial hole, and a positioning pin is provided concentrically with the axial hole for positioning, and they are installed longitudinally in sequence, connected by locking bolts that pass through the shell and the bottom cover, and the bolts are connected and locked with matching internal threaded holes provided in the shell; the oil pump shaft passes through between the shell and the bottom cover, and is connected in series with each layer of meshing rotors, and three through holes are provided on the shaft to pass through cylindrical pins , a rectangular groove is provided in the center of each of the three inner rotors, and a cylindrical pin passes through the oil pump shaft and is installed in the rectangular groove; each layer of the shell is provided with corresponding oil outlet and oil inlet channels to connect different oil circuits of the engine; five working chambers are formed between the inner and outer rotors, and the volumes of the five working chambers change continuously; in the cavity on one side of the oil inlet chamber, the volume gradually increases due to the disengagement of the rotors, a vacuum is generated, and the oil is sucked in; the oil flows with the rotation of the rotor and is brought to the side of the oil outlet chamber. At this time, the rotor is in a meshing state, the volume decreases, the oil pressure increases, and the oil is squeezed out of the rotor working chamber and enters the oil outlet channel and is sent out.

2. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: The oil pump structure is divided into three layers, and each layer is provided with a pair of inner and outer rotors that mesh and work together.

3. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: The oil pump housing is provided with a pump cavity, and the housing and the bottom cover together form a three-layer surrounding pump cavity, and a meshing rotor group is provided in the cavity.

4. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: The shell and the bottom cover are provided with a through hole for the shaft of the driving rotor group to pass through the shell and the bottom cover; the three-layer shell and the bottom cover are concentric through the shaft hole, positioned by a locating pin, and installed longitudinally in sequence. The shell is provided with a threaded hole, and the multi-layer shell is locked by a locking bolt that passes through the bottom cover and the shell.

5. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: A through hole for the shaft of the driving rotor group is provided at the center of the three inner rotors, and each is provided with a rectangular groove. A cylindrical pin passes through the oil pump shaft and is installed in the rectangular groove. The oil pump shaft passes through the shaft through hole to connect the three inner rotors.

6. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: The housing and the bottom cover are provided with an oil outlet and an oil inlet, which are directly connected to the box oil channel and the main oil pool. The volume of the working chamber changes through the movement of the rotor, and the oil channel transports the engine oil in and out of the oil pump.

7. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: The oil pump shaft passes through the housing and the bottom cover, and the shaft body is provided with three pin holes for driving the rotor assembly to move through cylindrical pin 1.

8. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: A second positioning pin and a rubber sealing ring are provided at the connection between the shell and the oil passage of the engine case, which are used for positioning the oil passage for installation and docking and sealing the oil passage.

9. The multi-layer oil pump structure for a scooter according to claim 1, characterized in that: A wear-resistant thrust washer is provided at the bottom of the second housing, which effectively prevents the axial movement of the oil pump shaft and avoids the wear of the housing caused by the axial movement of the oil pump shaft.

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