Oil pump

Abstract

The utility model relates to the technical field of oil pumps, and discloses an oil pump which comprises a pump shell. The pump cover covers the lower end of the pump shell, and an oil inlet and an oil outlet are formed in the pump cover; the bottom shell is in a groove shape, the inner wall of the bottom shell is in sealed connection with the outer wall of the pump shell, a dustproof cavity is formed between the inner wall of the bottom shell and the outer wall of the pump shell, a gas channel is formed in the bottom shell, one end of the gas channel is communicated with the dustproof cavity, and the other end of the gas channel is communicated to an inner cavity of the oil bottom shell. The dustproof cavity is formed between the inner wall of the bottom shell and the outer wall of the pump shell, and external dust and other impurities can be prevented from entering the pump shell through the dustproof cavity; the gas channel for communicating the dustproof cavity with the inner cavity of the oil pan is formed in the pan, so that the gas pressure in the dustproof cavity and the gas pressure in the inner cavity of the oil pan are balanced, and the problem that the oil pump is difficult to disassemble and assemble due to unbalanced pressure is solved; and gas separated out of the oil liquid flows into the dustproof cavity and is discharged through the gas channel.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to an engine oil pump. Background Art

[0002] The oil pump is an important part of the three-in-one oil-cooled electric drive system, providing the oil required for cooling and lubrication for the three-in-one electric drive assembly. The existing oil pump assembly generally includes a pump housing, a pump cover and a bottom housing. The pump cover is arranged on the pump housing, and the pump housing is sealed and connected to the bottom housing. The pump housing is provided with an oil inlet chamber, an oil outlet chamber and corresponding oil channels. When the oil pump is working, the oil inlet chamber forms a low-pressure area, and the oil outlet chamber forms a high-pressure area. When the oil pump is sucked empty, bubbles will precipitate from the oil in the oil outlet chamber under the action of the pressure difference. The bubbles cannot be discharged, resulting in an increase in the gas content in the oil and affecting the seal. In addition, if the air pressure inside and outside the oil pump is unbalanced, it will cause the oil pump to be difficult to disassemble and assemble. For example, if the external air pressure is greater than the internal air pressure, the oil pump will be difficult to disassemble or retract. For example, when assembling the oil pump, the pump housing needs to be pressed into the bottom housing. During the press-fitting, the gas in the sealing part is squeezed, resulting in an imbalance in the internal and external air pressures, which can easily cause the sealing ring to be dislocated or sheared. Utility Model Content

[0003] The purpose of the utility model is to provide an oil pump to at least partially solve the technical problems mentioned in the background technology part.

[0004] In order to achieve the above object, the utility model provides an oil pump, comprising:

[0005] Pump housing;

[0006] A pump cover, which is arranged at the lower end of the pump housing and is provided with an oil inlet and an oil outlet; and

[0007] The bottom shell is groove-shaped, the inner wall of the bottom shell is sealed with the outer wall of the pump shell, a dustproof cavity is formed between the inner wall of the bottom shell and the outer wall of the pump shell, a gas channel is opened in the bottom shell, one end of the gas channel is connected to the dustproof cavity, and the other end of the gas channel is connected to the inner cavity of the oil pan.

[0008] Preferably, the oil inlet is arranged on the lower end surface of the pump cover, and the oil outlet is arranged on the side surface of the pump cover.

[0009] Preferably, an oil inlet cavity is formed between the inner wall of the bottom shell and the lower end surface of the pump cover, and an oil outlet cavity is formed between the inner wall of the bottom shell and the side surface of the pump cover.

[0010] Preferably, the outer wall of the pump cover is provided with a first annular groove, and the outer wall of the pump housing is provided with a second annular groove and a third annular groove, the first annular groove is located between the oil inlet chamber and the oil outlet chamber in the vertical direction, the second annular groove is located between the oil outlet chamber and the dustproof chamber in the vertical direction, and the third annular groove is located above the dustproof chamber, and seals are provided in the first annular groove, the second annular groove and the third annular groove.

[0011] Preferably, the sealing element is a rubber sealing ring.

[0012] Preferably, a gas permeable plug is provided in the gas channel.

[0013] Preferably, the gas passage is curved or straight.

[0014] Preferably, the inner wall of the bottom shell and the outer wall of the pump shell are loosely matched.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) A dustproof cavity is formed between the inner wall of the bottom shell and the outer wall of the pump shell, through which external dust and other impurities can be prevented from entering the pump shell, thereby preventing the adverse effects of external impurities on the oil pump;

[0017] (2) A gas passage is provided in the bottom shell, and the dustproof chamber is connected with the inner cavity of the oil pan through the gas passage, so that the air pressure in the dustproof chamber is balanced with the air pressure in the inner cavity of the oil pan, thereby avoiding the problem of difficulty in disassembling and assembling the oil pump due to pressure imbalance, and also avoiding the problem of shearing or misalignment of the seal during assembly of the oil pump due to pressure imbalance;

[0018] (3) The bubbles in the oil in the oil outlet cavity will precipitate under the action of the pressure difference and rise to the dustproof cavity. The gas in the dustproof cavity is then discharged into the inner cavity of the oil pan through the gas channel opened in the bottom shell, thereby effectively discharging the bubbles in the oil and reducing the gas content in the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an oil pump in an embodiment;

[0020] The reference numerals are described as follows:

[0021] 101-pump housing; 102-pump cover; 103-oil inlet; 104-oil outlet; 105-bottom shell; 106-dustproof chamber; 107-gas channel; 108-oil inlet chamber; 109-oil outlet chamber; 110-first annular groove; 111-second annular groove; 112-third annular groove; 200-inner cavity of oil pan. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" 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 direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present invention, unless otherwise stated, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0026] Reference Figure 1 , an oil pump provided by an embodiment includes:

[0027] Pump housing 101;

[0028] A pump cover 102, which is disposed on the lower end of the pump housing 101 and is provided with an oil inlet 103 and an oil outlet 104; and

[0029] The bottom shell 105 is groove-shaped, the inner wall of the bottom shell 105 is sealed and connected to the outer wall of the pump housing 101, a dustproof cavity 106 is formed between the inner wall of the bottom shell 105 and the outer wall of the pump housing 101, and a gas channel 107 is opened in the bottom shell 105, one end of the gas channel 107 is connected to the dustproof cavity 106, and the other end of the gas channel 107 is connected to the inner cavity 200 of the oil pan.

[0030] The oil pump forms a dustproof cavity 106 between the inner wall of the bottom shell 105 and the outer wall of the pump housing 101, through which dust and other impurities can be prevented from entering the pump housing 101, thereby preventing the adverse effects of external impurities on the oil pump; a gas channel 107 is opened in the bottom shell 105, and the dustproof cavity 106 is connected to the oil pan cavity 200 through the gas channel 107, so that the air pressure in the dustproof cavity 106 is balanced with the air pressure in the oil pan cavity 200, and the air pressure in the oil pan cavity 200 is balanced. The pressure is equal to the atmospheric pressure, thereby avoiding the problem of difficulty in disassembling and assembling the oil pump due to pressure imbalance, and at the same time avoiding the problem of shearing or misalignment of the seal during assembly of the oil pump due to pressure imbalance; the bubbles in the oil in the oil outlet chamber 109 will precipitate under the action of the pressure difference and rise to the dustproof chamber 106, and the gas in the dustproof chamber 106 will be discharged into the oil pan inner chamber 200 through the gas channel 107 opened in the bottom shell 105, thereby effectively discharging the bubbles in the oil and reducing the gas content in the oil.

[0031] In one embodiment, the oil inlet 103 is disposed on the lower end surface of the pump cover 102, and the oil outlet 104 is disposed on the side surface of the pump cover 102. Further, an oil inlet cavity 108 is formed between the inner wall of the bottom shell 105 and the lower end surface of the pump cover 102, and an oil outlet cavity 109 is formed between the inner wall of the bottom shell 105 and the side surface of the pump cover 102. The oil in the oil inlet cavity 108 and the oil outlet cavity 109 can realize self-sealing of the interior of the pump housing 101. Furthermore, the outer wall of the pump cover 102 is provided with a first annular groove 110, and the outer wall of the pump housing 101 is provided with a second annular groove 111 and a third annular groove 112. The first annular groove 110 is located between the oil inlet chamber 108 and the oil outlet chamber 109 in the vertical direction, the second annular groove 111 is located between the oil outlet chamber 109 and the dustproof chamber 106 in the vertical direction, and the third annular groove 112 is located above the dustproof chamber 106. Seals are provided in the first annular groove 110, the second annular groove 111 and the third annular groove 112. By providing seals in the first annular groove 110, the second annular groove 111 and the third annular groove 112, three seals are formed inside the pump housing 101, thereby improving the sealing effect; in particular, since the oil outlet chamber 109 is prone to have sealing problems caused by changes in air pressure, the seal in the third annular groove can be used as a retention measure when the seal in the second annular groove 111 has sealing problems, so as to further improve the reliability of the seal and reduce the risk of oil leakage. Exemplarily, the sealing member may be a rubber sealing ring, and the elasticity of the rubber sealing cavity enables the sealing connection to form a tight fit, thereby ensuring a sealing effect.

[0032] In one embodiment, a vent plug is provided in the gas channel 107 , which can ensure the circulation of gas in the dustproof cavity 106 and gas in the inner cavity of the oil pan, and at the same time prevent dust and other impurities and oil in the inner cavity of the oil pan from entering the dustproof cavity 106 through the gas channel 107 .

[0033] The shape of the gas passage 107 can be designed as required, for example, the gas passage 107 is curved or straight. Preferably, the gas passage 107 is curved, and the curved gas passage 107 can further prevent dust and other impurities and oil in the inner cavity of the oil pan from entering the dustproof cavity 106 through the gas passage 107.

[0034] In one embodiment, the inner wall of the bottom shell 105 and the outer wall of the pump housing 101 are gap-matched, so that the bubbles in the oil outlet cavity 109 can flow into the dustproof cavity 106 along the tiny gap between the inner wall of the bottom shell 105 and the outer wall of the pump housing 101. Furthermore, when the pump housing 101 is press-fitted into the bottom shell 105, the gas squeezed at the sealing part during press-fitting can flow into the dustproof cavity 106 through the tiny gap, thereby avoiding dislocation or shearing of the seal.

[0035] The pump housing 101 is provided with a pump housing inner cavity, and a pump shaft and a transmission mechanism are conventionally provided in the inner cavity of the pump housing 101. For example, in one embodiment, the pump shaft passes through the inner cavity of the pump housing, an inner rotor is provided outside the pump shaft, and an outer rotor is provided outside the inner rotor, and the outer rotor and the inner rotor are provided in the same direction of the pump shaft radially outward. A mounting seat is provided outside the pump housing 101, and an axial hole is provided on the pump housing 101. One end of the pump shaft passes through the pump housing 101 through the axial hole, and an oil-free bearing is provided on the axial hole, and the oil-free bearing is sleeved outside the pump shaft.

[0036] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. An oil pump, characterized in that: include: Pump housing (101); A pump cover (102), the pump cover (102) being arranged on the lower end of the pump housing (101), and the pump cover (102) being provided with an oil inlet (103) and an oil outlet (104); and A bottom shell (105), wherein the bottom shell (105) is in a groove shape, the inner wall of the bottom shell (105) is sealedly connected to the outer wall of the pump shell (101), a dustproof cavity (106) is formed between the inner wall of the bottom shell (105) and the outer wall of the pump shell (101), and a gas channel (107) is opened in the bottom shell (105), one end of the gas channel (107) is connected to the dustproof cavity (106), and the other end of the gas channel (107) is connected to the inner cavity (200) of the oil pan.

2. The oil pump according to claim 1, characterized in that: The oil inlet (103) is arranged on the lower end surface of the pump cover (102), and the oil outlet (104) is arranged on the side surface of the pump cover (102).

3. The oil pump according to claim 2, characterized in that: An oil inlet chamber (108) is formed between the inner wall of the bottom shell (105) and the lower end surface of the pump cover (102), and an oil outlet chamber (109) is formed between the inner wall of the bottom shell (105) and the side surface of the pump cover (102).

4. The oil pump according to claim 3, characterized in that: The outer wall of the pump cover (102) is provided with a first annular groove (110), and the outer wall of the pump housing (101) is provided with a second annular groove (111) and a third annular groove (112); the first annular groove (110) is located between the oil inlet chamber (108) and the oil outlet chamber (109) in the vertical direction; the second annular groove (111) is located between the oil outlet chamber (109) and the dustproof chamber (106) in the vertical direction; the third annular groove (112) is located above the dustproof chamber (106); and sealing elements are provided in the first annular groove (110), the second annular groove (111) and the third annular groove (112).

5. The oil pump according to claim 4, characterized in that: The sealing element is a rubber sealing ring.

6. The oil pump according to claim 1, characterized in that: A gas permeable plug is arranged in the gas channel (107).

7. The oil pump according to claim 1, characterized in that: The gas channel (107) is curved or straight.

8. The oil pump according to claim 1, characterized in that: The inner wall of the bottom shell (105) is loosely matched with the outer wall of the pump shell (101).

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