Oil pump structure, generator and automobile

Abstract

The embodiment of the utility model provides an oil pump structure, generator and car, relate to the field of car. This oil pump structure includes oil pump seat and oil pump casing, oil pump casing is connected with oil pump seat and forms with each other interval oil suction chamber and pump oil chamber, is equipped with pressure relief groove between oil suction chamber and pump oil chamber, pressure relief groove links oil suction chamber with pump oil chamber. Oil pump can reduce the pressure difference between oil suction chamber and pump oil chamber through pressure relief groove when working, avoid the pressure difference of oil suction chamber and pump oil chamber too big, can solve the problem of big pressure pulsation and whistling. The embodiment of the utility model provides a kind of generator, including oil pump structure. The embodiment of the utility model provides a kind of oil car, including the generator.

Description

Technical Field

[0001] This utility model relates to the automotive field, specifically to an oil pump structure, a generator, and an automobile. Background Technology

[0002] In new energy vehicles, generators typically use mechanical oil pumps for oil cooling to achieve better thermal stability compared to water cooling. Currently, most generators on the market use cycloidal mechanical oil pumps, which have meshing inner and outer rotors within the pump chamber. The pump chamber also includes an oil suction chamber and a pumping chamber. As the inner and outer rotors rotate, oil is pumped from the suction chamber into the pumping chamber and then flows into the generator.

[0003] When the generator operates in a low-temperature environment, the viscosity of the oil is high, the torque of the inner rotor fluctuates greatly, and the pressure pulsation in the oil suction chamber and the oil pump chamber is large, which can easily cause the oil pump to whistle. Utility Model Content

[0004] This invention provides an oil pump structure, a generator, and an automobile, which can solve problems such as large pressure pulsation in the oil pump suction chamber and the oil pumping chamber, and oil pump whistling.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides an oil pump structure, which includes: Oil pump base; The oil pump housing is connected to the oil pump base and forms an oil suction chamber and an oil pumping chamber that are spaced apart from each other. A pressure reducing groove is provided between the oil suction chamber and the oil pumping chamber, and the pressure reducing groove connects the oil suction chamber and the oil pumping chamber.

[0006] Optionally, the pressure relief groove is a circular arc groove, which corresponds to the contact circle when the inner and outer rotors mesh.

[0007] Optionally, the cross-sectional shape of the pressure relief groove is rectangular, trapezoidal, semi-circular, semi-elliptical, or U-shaped.

[0008] Optionally, there may be multiple pressure relief tanks.

[0009] Optionally, the width of the pressure reducing tank is 0.5~1.5mm, and the depth of the pressure reducing tank is 0.3~0.8mm.

[0010] Optionally, the oil pump base is symmetrically provided with a first half-groove and a second half-groove along its own center, and the oil pump housing is symmetrically provided with a third half-groove and a fourth half-groove along its own center. The first half-groove and the third half-groove are adapted to form an oil suction chamber, and the second half-groove and the fourth half-groove are adapted to form a pump oil chamber.

[0011] Optionally, the oil pump base is sealed to the oil pump housing.

[0012] Optionally, the oil pump base is provided with an annular groove, and a sealing ring is arranged in the annular groove, which is in a sealing fit with the oil pump housing.

[0013] An embodiment of this utility model also provides a generator, including the oil pump structure described above.

[0014] An embodiment of this utility model also provides a car that includes the generator described above.

[0015] The beneficial effects of this utility model embodiment: The oil pump structure includes a pump base and a pump housing. The pump housing is connected to the pump base and forms an oil suction chamber and a pumping chamber spaced apart from each other. A pressure-reducing groove is provided between the oil suction chamber and the pumping chamber, connecting the two chambers. When the oil pump is working, the pressure-reducing groove can reduce the pressure difference between the oil suction chamber and the pumping chamber, preventing the pressure difference from being too large, thereby solving the problems of large pressure pulsation and whistling.

[0016] The generator includes an oil pump structure, which has all the functions of an oil pump structure.

[0017] The vehicle includes a generator, which has all the functions of an oil pump structure. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first-view schematic diagram of the oil pump seat structure provided in an embodiment of the present utility model; Figure 2 This is a second-view schematic diagram of the oil pump seat structure provided in an embodiment of the present invention; Figure 3 This is a first-view schematic diagram of the oil pump housing structure provided in an embodiment of the present utility model; Figure 4 This is a second-view schematic diagram of the oil pump housing structure provided in an embodiment of the present invention.

[0020] Icons: 1- Oil pump base; 101- First half-groove; 102- Second half-groove; 103- Annular groove; 2- Oil pump housing; 201- Third half-groove; 202- Fourth half-groove; 301- Oil suction inlet; 302- Oil suction guide groove; 303- Oil suction outlet; 401- Pump oil inlet; 402- Pump oil guide groove; 403- Pump oil outlet; 5- Pressure reducing groove; 6- Oil return chamber; 601- Oil return guide groove; 602- Oil return outlet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] Unless otherwise explicitly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, "connection" 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; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0029] In order to improve the cooling effect, generators in new energy vehicles typically use mechanical oil pumps for oil cooling. Oil cooling has better thermal stability than water cooling, which can improve the reliability and power density of the generator.

[0030] Currently, most oil pumps in oil-cooled generators are cycloidal mechanical oil pumps. Cycloidal mechanical oil pumps are efficient and compact positive displacement pumps. Structurally, they consist of an inner rotor, an outer rotor, and a pump chamber. The pump chamber is further designed with a suction chamber and a pumping chamber. The inner and outer rotors mesh with each other, and as they rotate, they pump oil from the suction chamber into the pumping chamber, and then into the generator to cool it down. When an oil-cooled generator operates in a low-temperature environment, the viscosity of the oil increases (e.g., at -40℃, the viscosity is 70 to 150 times that at 20℃), leading to increased suction resistance, large torque fluctuations in the inner rotor, and large pressure pulsations in the suction and pumping chambers. This can easily cause pump whistling, thus affecting the overall NVH performance of the vehicle.

[0031] In view of the above problems, embodiments of this utility model provide an oil pump structure, a generator, and a vehicle that can solve the above problems, and will be described in detail below.

[0032] Please refer to Figures 1 to 4The oil pump structure includes an oil pump base 1 and an oil pump housing 2. The oil pump housing 2 is connected to the oil pump base 1 and forms an oil suction chamber and a pumping chamber spaced apart from each other. A pressure reducing groove 5 is provided between the oil suction chamber and the pumping chamber, and the pressure reducing groove 5 connects the oil suction chamber and the pumping chamber. When the oil pump is working, the pressure reducing groove 5 can reduce the pressure difference between the oil suction chamber and the pumping chamber, avoid excessive pressure difference between the oil suction chamber and the pumping chamber, solve the problem of large pressure pulsation between the oil suction chamber and the pumping chamber, and reduce the probability of oil pump whistling.

[0033] Specifically, the oil pump base 1 is symmetrically provided with a first half-groove 101 and a second half-groove 102 along its own center, and the first half-groove 101 and the second half-groove 102 are arc-shaped grooves. The oil pump housing 2 is symmetrically provided with a third half-groove 201 and a fourth half-groove 202 along its own center, and the third half-groove 201 and the fourth half-groove 202 are also arc-shaped grooves. The third half-groove 201 is adapted to the first half-groove 101. When the oil pump housing 2 and the oil pump base 1 are connected together, the third half-groove 201 and the first half-groove 101 are connected to form an oil suction chamber; the fourth half-groove 202 is adapted to the second half-groove 102, and the fourth half-groove 202 and the second half-groove 102 are connected to form a pump oil chamber. The oil suction chamber and the oil pumping chamber are separated from each other. At the same time, the cavity between the oil pump base 1 and the oil pump housing 2 can also be equipped with an inner rotor and an outer rotor. The outer rotor is sleeved on the outside of the inner rotor and meshes with the inner rotor. When the inner rotor rotates, the gears of the inner rotor and the tooth grooves of the outer rotor form a gap, thereby pumping the oil in the oil suction chamber to the oil pumping chamber.

[0034] refer to Figure 4 The oil pump housing 2 is also provided with an oil suction inlet 301, an oil suction guide groove 302, and an oil suction outlet 303. The oil suction inlet 301 and the oil suction outlet 303 are respectively located at both ends of the oil suction guide groove 302. The oil suction guide groove 302 is opened on the oil pump housing 2 and is located on the opposite side of the side where the third half groove 201 is located. The oil suction outlet 303 is connected to the oil suction chamber. The oil pump housing 2 is also provided with an oil pump inlet 401, an oil pump guide groove 402, and an oil pump outlet 403. The oil pump inlet 401 and the oil pump outlet 403 are respectively located at both ends of the oil pump guide groove 402. The oil pump guide groove 402 and the oil suction guide groove 302 are on the same side of the oil pump housing 2. The oil pump inlet 401 is connected to the oil pump chamber. The oil pump housing 2 is also provided with an oil return chamber 6, an oil return guide groove 601 and an oil return outlet 602. The oil return chamber 6 is on the same side as the pump oil chamber, the oil return guide groove 601 is on the same side as the suction guide groove 302, one end of the oil return guide groove 601 is connected to the oil return chamber 6, and the other end of the oil return guide groove 601 is connected to the oil return outlet 602.

[0035] When the oil pump structure of this embodiment is used in conjunction with the generator, the oil pump structure is installed on the rear end cover, and the end of the motor spindle passes through the rear end cover and extends to the oil return chamber 6 of the oil pump structure. When the generator is working, the oil enters the pre-inlet channel on the rear end cover, and then enters the suction chamber through the suction inlet hole 301, suction guide groove 302 and suction outlet hole 303. The high-speed rotating inner and outer rotors pump the oil in the suction chamber into the pumping chamber. The oil from the pumping chamber enters the post-outlet channel on the rear end cover through the pumping inlet hole 401, pumping guide groove 402 and pumping outlet hole 403. The oil discharged from the post-outlet channel flows into the oil cooler to cool down the oil. The cooled oil enters the pre-return channel on the rear end cover, and then enters the return chamber 6 through the return outlet hole 602 and return guide groove 601. The oil enters the generator from the return chamber 6 to cool down the generator. The oil after heat exchange flows back to the pre-inlet channel on the rear end cover, realizing the circulation of the oil.

[0036] In this embodiment, the pressure-reducing groove 5 is an arc-shaped groove. The position of the arc-shaped groove corresponds to the contact circle when the inner and outer rotors mesh. This allows the pressure-reducing groove 5 to intermittently connect the oil suction chamber and the oil pump chamber, reducing the pressure difference between the two chambers and mitigating pressure pulsation and oil pump whistling caused by the pressure difference. There are at least two pressure-reducing grooves 5. In this embodiment, there are two pressure-reducing grooves 5, one at each end of the oil suction chamber and the other at the oil pump chamber. Both pressure-reducing grooves 5 are located on the contact circle when the inner and outer rotors mesh. The cross-sectional shape of the pressure-reducing groove 5 can be rectangular, trapezoidal, semi-circular, semi-elliptical, or U-shaped. Of course, other cross-sectional shapes are also possible and are not limited thereto.

[0037] Optionally, the width of the pressure-reducing groove 5 is 0.5~1.5mm, for example, the groove width can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, or 1.5mm; the depth of the pressure-reducing groove 5 is 0.3~0.8mm, for example, the groove depth can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm.

[0038] It is worth mentioning that the oil pump base 1 and the oil pump housing 2 need to be sealed together. The oil pump base 1 is provided with an annular groove 103, and a sealing ring is arranged in the annular groove 103. The sealing ring is sealed to the inner wall of the oil pump housing 2. The oil suction chamber and the oil pumping chamber are both located inside the annular groove 103, thereby achieving oil sealing and preventing oil leakage.

[0039] The oil pump structure of this utility model has a pressure reducing groove 5 between the oil suction chamber and the oil pump chamber, which can reduce the pressure difference between the oil suction chamber and the oil pump chamber and avoid excessive pressure difference between the oil suction chamber and the oil pump chamber, thereby solving the problems of large pressure pulsation and oil pump whistling.

[0040] An embodiment of this utility model also provides a generator, including the aforementioned oil pump structure, and further including a rear end cover, a generator housing, a generator rotor, a generator stator, and a spindle. The generator rotor, generator stator, and spindle are disposed between the generator housing and the rear end cover. The generator rotor is mounted on the spindle, and the generator stator is mounted on the generator housing and the rear end cover. One end of the spindle extends to the oil return chamber 6 of the oil pump structure, thereby allowing the oil to cool the generator. The structure and arrangement of the generator rear end cover, generator housing, generator rotor, generator stator, and spindle are prior art and will not be described in detail here.

[0041] An embodiment of this utility model also provides a car including the above-described generator. For example, when using a generator with the above-described oil pump structure, the NVH performance of the entire vehicle can be significantly improved.

[0042] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An oil pump structure, characterized in that, include: Oil pump base (1); Oil pump housing (2), the oil pump housing (2) is connected to the oil pump seat (1) and forms an oil suction chamber and an oil pumping chamber spaced apart from each other. A pressure reducing groove (5) is provided between the oil suction chamber and the oil pumping chamber. The pressure reducing groove (5) connects the oil suction chamber and the oil pumping chamber.

2. The oil pump structure according to claim 1, characterized in that, The pressure relief groove (5) is a circular arc groove, which corresponds to the contact circle when the inner and outer rotors mesh.

3. The oil pump structure according to claim 1, characterized in that, The cross-sectional shape of the pressure relief groove (5) is rectangular, trapezoidal, semi-circular, semi-elliptical or U-shaped.

4. The oil pump structure according to claim 1, characterized in that, The number of pressure relief grooves (5) is multiple.

5. The oil pump structure according to claim 1, characterized in that, The pressure relief groove (5) has a groove width of 0.5~1.5mm and a groove depth of 0.3~0.8mm.

6. The oil pump structure according to claim 1, characterized in that, The oil pump base (1) is symmetrically provided with a first half-groove (101) and a second half-groove (102) along its own center. The oil pump housing (2) is symmetrically provided with a third half-groove (201) and a fourth half-groove (202) along its own center. The first half-groove (101) and the third half-groove (201) are adapted to form the oil suction chamber, and the second half-groove (102) and the fourth half-groove (202) are adapted to form the oil pumping chamber.

7. The oil pump structure according to any one of claims 1-6, characterized in that, The oil pump base (1) is sealed to the oil pump housing (2).

8. The oil pump structure according to claim 7, characterized in that, The oil pump base (1) is provided with an annular groove (103), and a sealing ring is arranged in the annular groove (103). The sealing ring is sealed to the oil pump housing (2).

9. A generator, characterized in that, Includes the oil pump structure described in any one of claims 1-8.

10. A car, characterized in that, Includes the generator as described in claim 9.

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