High-flow cycloid rotor pump

Abstract

The utility model provides a high-flow cycloid rotor pump. The rotor pump comprises a motor, a middle body, a pump shell, an outer rotor, an inner rotor and a driving shaft, a working cavity is formed between the inner rotor and the outer rotor, an oil inlet hole is formed in the end, away from the motor, of the pump shell, an oil outlet hole is formed in the middle of the pump shell, and an oil inlet groove and an oil outlet groove which are communicated with the oil inlet hole and the oil outlet hole respectively are formed in the inner wall of the pump shell. A first groove and a second groove which are respectively communicated with the oil inlet groove and the oil outlet groove are correspondingly arranged on one side of the middle body adjacent to the oil pump body; and the first groove and the second groove are communicated with a working cavity between the inner rotor and the outer rotor. The oil outlet hole is formed in the middle of the pump body, the oil inlet groove and the oil outlet groove are additionally formed in the middle of the pump body, the purposes of feeding oil from the two ends of the rotor and discharging oil from the middle of the pump body are achieved, and the oil pump flow is improved.

Description

Technical Field

[0001] The utility model relates to a hydraulic oil pump, in particular to a large-flow cycloid rotor pump, which is an electronic oil pump body used for automobile lubrication systems or cooling systems, machine tool lubrication systems or other hydraulic systems. Background Art

[0002] The automotive industry is rapidly developing. As vehicles evolve towards safer, more reliable, more stable, fully automated, intelligent, environmentally friendly, and energy-efficient performance, electronic oil pumps are widely used in automotive lubrication and / or cooling systems, effectively meeting market demands. Electronic oil pumps primarily provide power for these systems.

[0003] Cycloidal rotor pumps are widely used in the lubrication systems of vehicles and marine equipment due to their many advantages, including compact structure, smooth operation, low pulsation, and high volumetric efficiency. Currently, electronic oil pumps used in the new automotive market, such as those with Chinese Patent Application No. 202010969091.5 and Chinese Patent Application No. 201810519275.4, generally adopt a single-sided oil inlet. After the oil enters the pump housing through the oil inlet, it enters between the inner and outer rotors from one end. The oil inlet flow is relatively small. During the speed change process of the internal combustion engine, the oil pump changes with the speed, and the oil supply and pressure will also change accordingly, resulting in some unstable factors. The oil supply is usually insufficient, which cannot meet the rapid cooling and lubrication needs of the new automotive market. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the utility model provides a large-flow cycloid rotor pump. After the cycloid rotor pump enters the oil pump housing through the oil inlet hole, the oil is divided into two paths and simultaneously enters the oil through the two ends of the inner and outer rotors, thereby increasing the oil flow channel and reducing the flow resistance. At the same time, the difference between the maximum area and the minimum area of ​​the closed cavities of the inner and outer rotors is increased, thereby increasing the displacement of the pump, improving the oil pump flow, and achieving the effect of rapid cooling and lubrication.

[0005] and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end.

[0006] A better technical solution of the present utility model is as follows: the inner wall of the pump housing at one end of which the oil inlet hole is provided is provided with a third groove connected to the oil outlet groove.

[0007] The better technical solution of the present utility model is as follows: the oil inlet hole is an arc-shaped hole with the drive shaft as the center, the oil inlet groove is located on the outer arc surface of one end of the oil inlet hole, and a first outward-expanding groove is provided at the position of the oil inlet hole corresponding to the oil inlet groove, and is connected to the oil inlet groove through the outward-expanding groove; the first groove has the same shape as the oil inlet hole and corresponds to the position.

[0008] The better technical solution of the present utility model is: the second groove is arranged in an arc shape, and the oil outlet groove is located on the outer arc surface of one end of the second groove, and a second outward-expanding groove is provided at the position of the second groove corresponding to the oil outlet groove, and is connected to the oil outlet groove through the second outward-expanding groove.

[0009] A better technical solution of the present utility model is as follows: the first groove and the second groove are distributed on both sides of the drive shaft, and the oil inlet hole and the third groove are distributed on both sides of the drive shaft.

[0010] A better technical solution of the present utility model is that the oil outlet hole is arranged in a waist-shaped shape.

[0011] A further technical solution of the present invention is that the pump housing is provided with a sealing ring adjacent to the oil inlet end.

[0012] The better technical solution of the present utility model is as follows: the shape of the third groove is an arc-shaped groove similar to the oil inlet hole, the oil outlet groove is located on the outer arc surface of one end of the third groove, and a third outward-expanding groove is provided at the position of the third groove corresponding to the oil outlet groove, and is connected to the oil outlet groove through the third outward-expanding groove.

[0013] Beneficial effects of the utility model:

[0014] (1) The utility model provides an oil inlet groove and an oil outlet groove on the inner wall of the oil pump housing, the oil inlet groove is connected to the oil inlet, and an oil inlet groove connected to the oil inlet groove and an oil outlet groove connected to the oil outlet groove are correspondingly provided on the intermediate body base. A part of the oil entering the oil pump housing through the oil inlet hole directly enters between the inner and outer rotors through the end of the oil inlet hole, and the other part flows into the oil inlet groove at the bottom through the oil inlet groove on the inner wall of the oil pump housing, and then enters between the inner and outer rotors from the other end; the purpose of oil supply at both ends is achieved, thereby increasing the oil supply amount.

[0015] (2) The oil outlet of the utility model is set in the middle of the pump body. By adding an oil inlet groove and an oil outlet groove in the middle of the pump body, the purpose of oil entering from both ends of the rotor and discharging from the middle of the pump body is achieved. Under the condition of the same volume, the flow rate is increased, the oil flow channel is increased to reduce the flow resistance, the oil pump flow rate is improved, and the effect of rapid cooling and lubrication is achieved, which solves the demand for large-flow electronic oil pumps in the new automobile market. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the oil outlet portion of the utility model;

[0017] Figure 2 It is a cross-sectional view of the oil inlet groove of the utility model;

[0018] Figure 3 This is a structural diagram of the oil inlet end face of the utility model;

[0019] Figure 4 This is a schematic diagram of the oil inlet end face of the oil pump body of the utility model;

[0020] Figure 5 yes Figure 3 Middle AA section;

[0021] Figure 6 It is a schematic diagram of the intermediate structure of the utility model;

[0022] Figure 7 It is a schematic diagram of the pump casing structure of the present utility model.

[0023] In the figure: 1—pump housing, 2—outer rotor, 3—inner rotor, 4—drive shaft, 5—oil outlet hole, 6—oil inlet hole, 600—first outward-expanding groove, 7—oil inlet groove, 8—intermediate body, 9—motor, 10—oil outlet groove, 11—first groove, 12—second groove, 1200—second outward-expanding groove, 13—sealing ring, 14—third groove, 1400—third outward-expanding groove. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 7The accompanying drawings are simplified examples and are intended solely to clearly and concisely illustrate the embodiments of the present invention. The technical solutions presented in the accompanying drawings are specific examples of the present invention and are not intended to limit the scope of the claimed invention. All other examples derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the present invention is typically placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] The embodiment provides a large flow cycloid rotor pump, such as Figures 1 to 7 As shown, it includes an oil pump body and a motor 9, and an intermediate body 8 is provided at one end of the oil pump body adjacent to the motor 9, and the drive shaft 4 of the motor 9 passes through the intermediate body 8 and is rotatably connected to the oil pump body; the oil pump body includes a pump casing 1, an outer rotor 2 and an inner rotor 3, and the pump casing 1 is a circular structure, and its end adjacent to the motor 9 is an open pile, the intermediate body 8 is connected to the open surface of the pump casing 1, and a rotor cavity is formed between the intermediate body 8 and the pump casing 1, and the drive shaft 4 extends into the middle of the rotor cavity; the outer rotor 2 and the inner rotor 3 are rotatably installed in the rotor cavity, the inner rotor 3 is sleeved on the outside of the drive shaft 4, the outer rotor 2 is sleeved on the outside of the inner rotor 3, and a working cavity is formed between the inner rotor 3 and the outer rotor 2.

[0027] The embodiment provides a large flow cycloid rotor pump, such as Figures 1 to 7 As shown, an oil inlet hole 6 is provided at one end of the pump housing 1 away from the motor 9. The oil inlet hole 6 is connected to the working chamber. A portion of the oil entering through the oil inlet hole 6 can be transported to the working chamber between the inner and outer rotors through one end of the oil inlet hole 6. An oil outlet hole 5 is provided in the middle of the pump housing 1. An oil inlet groove 7 connected to the oil inlet hole 6 and an oil outlet groove 10 connected to the oil outlet hole 5 are provided on the inner wall of the pump housing 1. The oil inlet hole 6 is an arc-shaped hole, and the inner concave surface of the arc faces the drive shaft 4 and is the center of the circle with the drive shaft 4. The oil inlet groove 7 is located on the outer arc surface of one end of the oil inlet hole 6, and a first outward-expanding groove 600 is provided at the position of the oil inlet hole 6 corresponding to the oil inlet groove 7, and is connected to the oil inlet groove 7 through the outward-expanding groove 600. The oil outlet hole 5 is configured to be oval in shape.

[0028] In the embodiment, Figures 1 to 7 As shown, a first groove 11 and a second groove 12 are provided on one side of the intermediate body 8 adjacent to the oil pump body. The first groove 11 and the second groove 12 are distributed on both sides of the drive shaft 4, and the first groove 11 and the second groove 12 are arranged approximately symmetrically. The first groove 11 and the second groove 12 evenly connect the working chamber between the inner rotor 3 and the outer rotor 2. The first groove 11 is located at a position matching the oil inlet hole 6 and has the same shape as the oil inlet hole 6. The first groove 11 is connected to the oil inlet groove 7 on the inner wall of the pump housing 1. The oil inlet hole 6 and the first groove 11 are respectively located at both ends of the oil inlet groove and are connected through the oil inlet groove 7. Another portion of the oil entering through the oil inlet hole 6 enters the first groove 11 through the oil inlet groove 7, and then enters the working chamber between the inner and outer rotors from the other end, thereby achieving two-way oil supply. The second groove 12 is connected to the oil outlet groove 10 on the inner wall of the pump casing 1, and the oil outlet groove 10 leads to the oil outlet hole 5; the second groove 12 is also arranged in an arc shape, and the oil outlet groove 10 is located on the outer arc surface at one end of the second groove 12, and the second groove 12 is provided with a second outward-expanding groove 1200 at a position corresponding to the oil outlet groove 10, and is connected to the oil outlet groove 10 through the second outward-expanding groove 1200; the pump casing 1 is provided with a third groove 14 on the inner wall at one end of the oil inlet hole 6, which is connected to the oil outlet groove 10, and the third groove 14 and the oil inlet hole 6 are distributed on both sides of the drive shaft 4, and the third groove 14 and the oil inlet hole 6 are arranged approximately symmetrically, and the shape of the third groove 14 is an arc groove similar to the oil inlet hole, and the oil outlet groove 10 is located on the outer arc surface at one end of the third groove 14, and the third groove 14 is provided with a third outward-expanding groove 1400 at a position corresponding to the oil outlet groove 10, and is connected to the oil outlet groove 10 through the third outward-expanding groove 400. The second groove 12 and the third groove 14 are respectively located at the two ends of the oil outlet groove 10 and are connected through the oil outlet groove 10. The oil in the working chamber between the inner and outer rotors can enter the oil outlet groove 10 through the second groove 12 and the third groove 14 respectively, and then flow out through the oil outlet hole 5.

[0029] The oil pump body in the embodiment, such as Figure 1 and Figure 2 As shown, a sealing ring 13 is provided near the oil inlet end of the pump housing 1. When the oil pump body is in use, it is installed in a housing, and the sealing ring is used to seal the pump housing and the housing so that the oil can enter the oil pump body through the oil inlet hole 6.

[0030] The shapes of the first groove 11, the second groove 12, the third groove 14 and the oil inlet hole 6 in the embodiment are similar and can be set to an irregular arc shape, similar to an arc shape. Because of the setting of the outward-expanding groove, each groove and the oil inlet hole forms a special-shaped structure with one end narrow and the other end wide.

[0031] The working process of this utility model is as follows: Figure 5As shown, the engine oil enters the pump casing 1 through the oil inlet hole 6 at the end of the pump casing 1. A portion of the oil entering the pump casing 1 directly enters the working chamber between the inner rotor 3 and the outer rotor 2 from the end of the oil inlet hole 6, and the other portion enters the oil inlet groove 7 connected to the oil inlet hole 6, and then flows into the first groove 11 at the bottom of the oil inlet groove 7. During the rotation of the inner and outer rotors, the oil inlet port of the working chamber will become larger, and then the oil in the first groove 11 will also enter the working chamber. At the same time, the oil outlet side of the working chamber will become smaller, and the oil on the oil outlet side will be squeezed to the second groove 12 and the third groove 14, and then enter the oil outlet groove 10 through the second groove 12 and the third groove 14, and finally flow out through the oil outlet hole 5, completing the whole process.

[0032] The utility model realizes oil inlet and outlet from both ends of the working cavity between the inner and outer rotors, increases the oil flow channel and reduces the flow resistance, and at the same time increases the difference between the maximum area and the minimum area of ​​the closed cavity of the inner and outer rotors, increases the displacement of the pump, improves the oil pump flow, plays a role in rapid cooling and lubrication, and solves the demand for large-flow electronic oil pumps in the new automobile market.

[0033] The above is merely one embodiment of the present invention, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A large flow cycloid rotor pump, comprising an oil pump body and a motor (9), an intermediate body (8) is provided at one end of the oil pump body adjacent to the motor (9), a drive shaft (4) of the motor (9) passes through the intermediate body (8) and is rotatably connected to the oil pump body, the oil pump body comprising a pump housing (1), an outer rotor (2) and an inner rotor (3), the pump housing (1) being connected to the intermediate body (8), forming a rotor cavity therebetween, the outer rotor (2) and the inner rotor (3) being rotatably mounted in the rotor cavity, and a working cavity being formed between the inner rotor (3) and the outer rotor (2), an oil inlet hole (6) being provided at one end of the pump housing (1) away from the motor (9), the oil inlet hole (6) being communicated with the working cavity, and characterized in that: An oil outlet hole (5) is provided in the middle of the pump housing (1), an oil inlet groove (7) communicating with the oil inlet hole (6) and an oil outlet groove (10) communicating with the oil outlet hole (5) are provided on the inner wall of the pump housing (1), a first groove (11) and a second groove (12) are provided on one side of the intermediate body (8) adjacent to the oil pump body, the first groove (11) is arranged at a position matching the oil inlet hole (6) and communicating with the oil inlet groove (7) on the inner wall of the pump housing (1), the second groove (12) is communicated with the oil outlet groove (10) on the inner wall of the pump housing (1), and the oil outlet groove (10) leads to the oil outlet hole (5); the first groove (11) and the second groove (12) are evenly connected to the working chamber between the inner rotor (3) and the outer rotor (2).

2. A large flow cycloid rotor pump according to claim 1, characterized in that: The pump housing (1) is provided with an oil inlet hole (6) and an inner wall thereof at one end thereof is provided with a third groove (14) communicating with the oil outlet groove (10).

3. A large flow cycloid rotor pump according to claim 1 or 2, characterized in that: The oil inlet hole (6) is an arc-shaped hole with the drive shaft (4) as the center, the oil inlet groove (7) is located on the outer arc surface of one end of the oil inlet hole (6), and a first outward-expanding groove (600) is provided at a position of the oil inlet hole (6) corresponding to the oil inlet groove (7), and is connected to the oil inlet groove (7) as a whole through the outward-expanding groove (600); the first groove (11) has the same shape as the oil inlet hole (6) and corresponds to the position.

4. A large flow cycloid rotor pump according to claim 1 or 2, characterized in that: The oil outlet hole (5) is configured to be in a waist-shaped shape.

5. A large flow cycloid rotor pump according to claim 1 or 2, characterized in that: The pump housing (1) is provided with a sealing ring (13) adjacent to the oil inlet end.

6. A large flow cycloid rotor pump according to claim 2, characterized in that: The third groove (14) is an arc-shaped groove similar in shape to the oil inlet hole, the oil outlet groove (10) is located on the outer arc surface of one end of the third groove (14), and a third outward-expanding groove (1400) is provided at a position of the third groove (14) corresponding to the oil outlet groove (10), and is connected to the oil outlet groove (10) as a whole through the third outward-expanding groove (1400).

7. A large flow cycloid rotor pump according to claim 2, characterized in that: The first groove (11) and the second groove (12) are distributed on both sides of the drive shaft (4), and the oil inlet hole (6) and the third groove (14) are distributed on both sides of the drive shaft (4).

8. A large flow cycloid rotor pump according to claim 3, characterized in that: The second groove (12) is arranged in an arc shape, the oil outlet groove (10) is located on the outer arc surface of one end of the second groove (12), and a second outward-expanding groove (1200) is provided at a position of the second groove (12) corresponding to the oil outlet groove (10), and is connected to the oil outlet groove (10) as a whole through the second outward-expanding groove (1200).

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