Temperature control oil cooling gearbox oil pump structure

Abstract

A temperature control oil cooling gearbox oil pump structure is characterized in that a partition plate is formed in a pump body, a stator assembly and a rotor assembly which are matched with each other are arranged at the position, above the partition plate, in the pump body, the rotor assembly is connected with a center shaft, and the center shaft penetrates through the partition plate to be connected with an eccentric gear located on the lower portion of the pump body; a containing groove is formed in the lower portion of the partition plate, and an oil passing hole is further formed in the partition plate. The oil passing hole is located below a stator coil of the stator assembly. A bimetallic strip temperature control switch is arranged in the containing groove. The oil passing hole is covered with the bimetallic strip temperature control switch, and the bimetallic strip temperature control switch is used for controlling oil in the pump body to enter a stator coil of the stator assembly through the oil passing hole for heat exchange. The oil pump can rapidly enter the optimal temperature range and keep the optimal temperature range, the starting difficulty of the oil pump is reduced, and after the temperature changes, the heat dissipation mode can be adjusted according to the actual situation, and it is guaranteed that the oil pump is in the optimal heat dissipation state all the time.

Description

Technical Field

[0001] The utility model relates to a temperature-controlled oil-cooled gearbox oil pump structure, belonging to the technical field of gearbox cooling systems. Background Art

[0002] At present, the requirements for the oil pump cooling system of electric vehicles are relatively high. Generally, housing cooling or oil cooling is adopted. Housing cooling is to use a circuit board to conduct heat to the cast aluminum housing through a heat-conducting adhesive, and the housing is then cooled by air. Oil cooling is to use flowing oil to pass through the edge of the stator winding in the oil pump to dissipate heat for the heated winding. After the winding is cooled, the heat cannot be conducted to the circuit board, and the circuit board thus achieves the purpose of indirect heat dissipation.

[0003] However, at extremely low temperatures, such as -40°C, the oil is very viscous, which leads to difficult starting of the oil pump, resulting in a large starting current of the circuit board and requiring a long time to operate normally. And after the temperature changes, it still dissipates heat in the same mode all the time, unable to dissipate heat according to the actual situation, thus causing the oil pump not to be in the best heat dissipation state all the time. Summary of the Utility Model

[0004] Therefore, the utility model provides a temperature-controlled oil-cooled gearbox oil pump structure to solve the problems that the gearbox oil pump is difficult to start at extremely low temperatures and cannot dissipate heat according to the actual situation.

[0005] To achieve the above object, the utility model provides the following technical solution: A temperature-controlled oil-cooled gearbox oil pump structure includes a pump body. A partition is formed inside the pump body. Above the partition in the pump body, a stator assembly and a rotor assembly that cooperate with each other are provided. The rotor assembly is connected with a central shaft, and the central shaft passes through the partition and is connected with an eccentric gear located at the lower part of the pump body. A receiving groove is formed below the partition, and an oil passing hole is also provided on the partition. The oil passing hole is below the stator coil of the stator assembly. A bimetallic thermostatic switch is provided inside the receiving groove. The bimetallic thermostatic switch covers the oil passing hole, and the bimetallic thermostatic switch is used to control the oil in the pump body to enter the stator coil of the stator assembly through the oil passing hole for heat exchange.

[0006] As a preferred scheme of the temperature-controlled oil-cooled gearbox oil pump structure, a end cover is connected to the top of the pump body. The end cover is provided with an exhaust valve and heat dissipation columns, and the exhaust valve is used for discharging the high-temperature gas inside the pump body.

[0007] As a preferred scheme of the temperature-controlled oil-cooled gearbox oil pump structure, a stator winding cavity is connected to the upper part of the stator assembly. A plurality of fixing columns are also distributed at the upper end of the stator winding cavity, and the fixing columns are connected with an oil pump control circuit board.

[0008] As a preferred solution for the structure of the temperature-controlled oil-cooled gearbox oil pump, a motor three-phase connector is connected to the upper end of the stator winding cavity; a power connector is connected to the side of the pump body, and the power connector and the motor three-phase connector are electrically connected.

[0009] As a preferred solution for the structure of the temperature-controlled oil-cooled gearbox oil pump, a filter assembly is further connected to the bottom of the pump body, and the eccentric gear is located between the filter assembly and the partition.

[0010] As a preferred solution for the structure of the temperature-controlled oil-cooled gearbox oil pump, the filter assembly includes a filter mounting seat, a filter body, and a filter fixing pressure ring; the upper end of the filter mounting seat is connected to the bottom of the pump body; a filtered oil through-hole is formed in the center of the filter mounting seat; the filter body is fixed between the filter mounting seat and the filter fixing pressure ring.

[0011] As a preferred solution for the structure of the temperature-controlled oil-cooled gearbox oil pump, the eccentric gear includes an outer gear ring and an inner gear; the inner gear is arranged inside the outer gear ring, the inner gear is in an eccentric position of the outer gear ring, and the center of the inner gear is connected to the central shaft.

[0012] As a preferred solution for the structure of the temperature-controlled oil-cooled gearbox oil pump, an oil passing gap is formed between the outer gear ring and the inner gear.

[0013] The utility model has the following advantages: a partition is formed inside the pump body, a stator assembly and a rotor assembly which cooperate with each other are arranged above the partition inside the pump body, the rotor assembly is connected with a central shaft, the central shaft passes through the partition and is connected with an eccentric gear located at the lower part of the pump body; a receiving groove is formed at the lower part of the partition, and an oil passing hole is further arranged on the partition; the oil passing hole is located below the stator coil of the stator assembly; a bimetal temperature control switch is arranged inside the receiving groove; the bimetal temperature control switch covers the oil passing hole, and the bimetal temperature control switch is used for controlling the oil liquid in the pump body to enter the stator coil of the stator assembly through the oil passing hole for heat exchange. The utility model can enable the oil pump to quickly enter the optimal temperature range and maintain the optimal temperature range, reduce the starting difficulty of the oil pump, and can adjust the heat dissipation mode according to the actual situation after the temperature changes, so as to ensure that the oil pump is always in the best heat dissipation state. Description of the Drawings

[0014] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained according to the provided drawings without creative efforts.

[0015] The structures, ratios, sizes, etc. shown in this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the ratio relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0016] Figure 1 It is a three-dimensional structure schematic diagram of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0017] Figure 2 It is a sectional view schematic diagram of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0018] Figure 3 It is a schematic diagram of the bimetallic temperature switch of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0019] Figure 4 It is a schematic diagram of the inside of the pump body of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0020] Figure 5 It is a combined schematic diagram of the central shaft and the rotor assembly of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0021] Figure 6 It is a schematic diagram of the stator assembly of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0022] Figure 7 It is a schematic diagram of the filter screen assembly of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model;

[0023] Figure 8 It is a schematic diagram of the eccentric gear of the temperature-controlled oil-cooled gearbox oil pump structure provided in the embodiment of the present utility model.

[0024] In the figure, 1, pump body; 2, partition board; 3, stator assembly; 4, rotor assembly; 5, central shaft; 6, eccentric gear; 7, receiving groove; 8, oil passing hole; 9, bimetallic temperature switch; 10, end cover; 11, exhaust valve; 12, heat dissipation column; 13, stator winding cavity; 14, fixing column; 15, oil pump control circuit board; 16, motor three-phase connector; 17, power supply connector; 18, filter screen assembly; 19, filter screen mounting seat; 20, filter screen body; 21, filter screen fixing pressing ring; 22, filtered oil through hole; 23, outer gear ring; 24, inner gear; 25, oil passing gap. Detailed implementation manners

[0025] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , an oil temperature controlled oil-cooled gearbox oil pump structure is provided in an embodiment of the present utility model, which includes a pump body 1. A partition 2 is formed inside the pump body 1. An interacting stator assembly 3 and rotor assembly 4 are provided above the partition 2 inside the pump body 1. The rotor assembly 4 is connected with a central shaft 5. The central shaft 5 passes through the partition 2 and is connected with an eccentric gear 6 located at the lower part of the pump body 1. A receiving groove 7 is formed below the partition 2. An oil passing hole 8 is further provided on the partition 2. The oil passing hole 8 is located below the stator coil of the stator assembly 3. A bimetallic thermostatic switch 9 is provided inside the receiving groove 7. The bimetallic thermostatic switch 9 covers the oil passing hole 8. The bimetallic thermostatic switch 9 is used to control the oil in the pump body 1 to enter the stator coil of the stator assembly 3 through the oil passing hole 8 for heat exchange.

[0027] In this embodiment, a end cover 10 is connected to the top of the pump body 1. The end cover 10 is provided with an exhaust valve 11 and heat dissipation columns 12. The exhaust valve 11 is used to discharge the high-temperature gas inside the pump body 1.

[0028] Specifically, the end cover 10 is installed above the pump body 1 to protect the internal circuit of the pump body 1 and for heat dissipation. The design of the heat dissipation columns 12 improves the heat dissipation efficiency. If the air pressure inside the pump body 1 is relatively high, it can be exhausted through the exhaust valve 11 on the end cover 10, thereby avoiding damage to the inside of the pump body 1.

[0029] In this embodiment, an upper part of the stator assembly 3 is connected with a stator winding cavity 13. A plurality of fixing columns 14 are further distributed at the upper end of the stator winding cavity 13. The fixing columns 14 are connected with. The oil pump control circuit board 15 plays a role in controlling the oil pump. The oil pump control circuit board 15 is fixed through the fixing columns 14. The oil pump control circuit board 15 itself belongs to the prior art and will not be elaborated herein. Among them, the stator winding cavity 13 is where the stator assembly 3 of the motor generates the torque of the motor. The thin holes in the winding are channels through which the oil passes and can dissipate heat for the oil.

[0030] In this embodiment, the upper end of the stator winding cavity 13 is connected to the motor three-phase connector 16; the side of the pump body 1 is connected to the power supply connector 17, and the power supply connector 17 and the motor three-phase connector 16 are electrically connected. The internal rotor assembly 4 and stator assembly 3 are powered through the power supply connector 17 and the motor three-phase connector 16, and the rotor assembly 4 and the stator assembly 3 cooperate to realize the operation of the central shaft 5. The rotor assembly 4 and the stator assembly 3 themselves belong to the prior art and will not be elaborated here.

[0031] See Figure 7 , in this embodiment, the bottom of the pump body 1 is further connected with a filter screen assembly 18, and the eccentric gear 6 is located between the filter screen assembly 18 and the partition plate 2; the filter screen assembly 18 includes a filter screen mounting seat 19, a filter screen body 20 and a filter screen fixing pressing ring 21; the upper end of the filter screen mounting seat 19 is connected to the bottom of the pump body 1; a filter oil through hole 22 is formed in the center of the filter screen mounting seat 19; the filter screen body 20 is fixed between the filter screen mounting seat 19 and the filter screen fixing pressing ring 21.

[0032] Specifically, the filter screen assembly 18 is installed below the pump body 1, which functions to filter the oil fluid and seal the eccentric gear 6. After being filtered by the filter screen assembly 18, the oil fluid enters the eccentric gear 6 through the filter oil through hole 22. During rotation, the eccentric gear sucks the oil fluid from the filter screen assembly 18 and transports it to the pump body 1 for discharge.

[0033] See Figure 8 , in this embodiment, the eccentric gear 6 includes an outer gear ring 23 and an inner gear 24; the inner gear 24 is arranged inside the outer gear ring 23, the inner gear 24 is at an eccentric position of the outer gear ring 23, and the center of the inner gear 24 is connected to the central shaft 5; an oil passing gap 25 is formed between the outer gear ring 23 and the inner gear 24.

[0034] Specifically, during the operation of the eccentric gear 6, the central shaft 5 drives the inner gear 24 and the outer gear ring 23 to rotate. Since the inner gear 24 is at an eccentric position of the outer gear ring 23 and an oil passing gap 25 is formed between the outer gear ring 23 and the inner gear 24, the filtered oil fluid can be transported.

[0035] The principle of the present utility model to achieve different opening degrees according to different temperatures is as follows:

[0036] When the oil is in an environment with extremely low temperature (e.g., -40°C), the oil will become very viscous. At this time, the resistance of the rotor assembly 4 is very large, and the current passing through the coil of the stator assembly 3 is very large, causing the stator assembly 3 to become very hot. The heat is conducted to the bimetallic thermostatic switch 9, causing the bimetallic thermostatic switch 9 to open the passage of the oil hole 8, and the oil will enter the coil of the stator assembly 3 for circulation. The heat of the coil of the stator assembly 3 will quickly heat the oil, making the oil become thinner in a short time, reducing the resistance of the rotor assembly 4, and then reducing the current of the stator assembly 3. When the oil temperature is normal, the bimetallic thermostatic switch 9 closes, and the oil will not enter the stator assembly 3.

[0037] When the oil temperature is very high, the temperature of the stator assembly 3 and the upper oil pump control circuit board 15 will be even higher. The bimetallic thermostatic switch 9 will open again, and the oil will enter the coil of the stator assembly 3 for circulation to maintain the temperature at the oil temperature (generally about 105°C), so that the oil pump control circuit board 15 will not be overheated and damaged. In case of special circumstances where the temperature is higher than 120°C, the oil pump control circuit board 15 itself will activate automatic protection to avoid burning. Among them, the high-temperature protection of the oil pump control circuit board 15 relies on the existing thermal protection circuit. The thermal protection circuit can protect electronic devices and circuits from overheating damage. Based on the combination of a temperature sensor and a controller, when the temperature exceeds the set safe range, the controller will trigger a protection mechanism to take measures to reduce the temperature or cut off the power supply, thereby protecting the circuit board and the electronic components on it from damage.

[0038] In summary, a partition 2 is formed inside the pump body 1 of the present utility model. Above the partition 2 inside the pump body 1, a stator assembly 3 and a rotor assembly 4 that cooperate with each other are provided. The rotor assembly 4 is connected to a central shaft 5, and the central shaft 5 passes through the partition 2 and is connected to an eccentric gear 6 located at the lower part of the pump body 1. A receiving groove 7 is formed at the lower part of the partition 2, and an oil passage hole 8 is also provided on the partition 2. The oil passage hole 8 is located below the stator coil of the stator assembly 3. A bimetallic thermostatic switch 9 is provided inside the receiving groove 7. The bimetallic thermostatic switch 9 covers the oil passage hole 8, and the bimetallic thermostatic switch 9 is used to control the oil in the pump body 1 to enter the stator coil of the stator assembly 3 through the oil passage hole 8 for heat exchange. When the oil is in an environment with extremely low temperature (such as -40 °C), the oil will become very viscous. At this time, the resistance of the rotor assembly 4 is very large, and the current passing through the coil of the stator assembly 3 is very large, causing the stator assembly 3 to become very hot. The heat is conducted to the bimetallic thermostatic switch 9, causing the bimetallic thermostatic switch 9 to open the passage of the oil passage hole 8, and the oil will enter the coil of the stator assembly 3 for circulation. The heat of the coil of the stator assembly 3 will quickly heat up the oil, making the oil become thinner in a short time, reducing the resistance of the rotor assembly 4, and thus reducing the current of the stator assembly 3. When the oil temperature is normal, the bimetallic thermostatic switch 9 closes, and the oil will not enter the stator assembly 3. When the oil temperature is very high, the temperature of the stator assembly 3 and the upper oil pump control circuit board 15 will be even higher. The bimetallic thermostatic switch 9 opens again, and the oil enters the coil of the stator assembly 3 for circulation, maintaining the temperature at the oil temperature (generally about 105 °C), so that the oil pump control circuit board 15 will not be damaged by overheating. In case of special circumstances, when the temperature is higher than 120 °C, the oil pump control circuit board 15 itself will start automatic protection to avoid burning. Among them, the high-temperature protection of the oil pump control circuit board 15 depends on the existing thermal protection circuit. The thermal protection circuit can protect electronic devices and circuits from damage caused by overheating. Based on the combination of a temperature sensor and a controller, when the temperature exceeds the set safe range, the controller will trigger a protection mechanism to take measures to reduce the temperature or cut off the power supply, thereby protecting the circuit board and the electronic components on it from damage. The present utility model can enable the oil pump to quickly enter the optimal temperature range and maintain the optimal temperature range, reduce the starting difficulty of the oil pump, and after the temperature changes, the heat dissipation method can be adjusted according to the actual situation to ensure that the oil pump is always in the best heat dissipation state.

[0039] In the above text, the present utility model has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be understood that based on the technical concept of the present utility model, several conventional adjustments or further innovations can be made to these specific embodiments; but as long as they do not depart from the technical concept of the present utility model, the technical solutions obtained from these conventional adjustments or further innovations also fall within the protection scope of the claims of the present utility model.

Claims

1. A temperature-controlled oil-cooled transmission oil pump structure, comprising a pump body (1), wherein a partition (2) is formed inside the pump body (1), wherein a stator assembly (3) and a rotor assembly (4) that cooperate with each other are arranged above the partition (2) inside the pump body (1), wherein the rotor assembly (4) is connected to a central shaft (5), wherein the central shaft (5) passes through the partition (2) and is connected to an eccentric gear (6) located at the lower part of the pump body (1); characterized in that: A receiving groove (7) is formed at the lower part of the partition (2), and an oil through hole (8) is also provided on the partition (2); the oil through hole (8) is located below the stator coil of the stator assembly (3); a bimetallic temperature control switch (9) is provided inside the receiving groove (7); the bimetallic temperature control switch (9) covers the oil through hole (8), and the bimetallic temperature control switch (9) is used to control the oil in the pump body (1) to enter the stator coil of the stator assembly (3) through the oil through hole (8) for heat exchange.

2. A temperature-controlled oil-cooled transmission oil pump structure according to claim 1, characterized in that: The top end of the pump body (1) is connected to an end cover (10), and the end cover (10) is provided with an exhaust valve (11) and a heat dissipation column (12). The exhaust valve (11) is used to discharge high-temperature gas inside the pump body (1).

3. The temperature-controlled oil-cooled transmission oil pump structure according to claim 1, characterized in that: The upper part of the stator assembly (3) is connected to a stator winding cavity (13); a plurality of fixing columns (14) are distributed at the upper end of the stator winding cavity (13), and the fixing columns (14) are connected to an oil pump control circuit board (15).

4. A temperature-controlled oil-cooled transmission oil pump structure according to claim 3, characterized in that: The upper end of the stator winding cavity (13) is connected to a motor three-phase connector (16); the side of the pump body (1) is connected to a power connector (17), and the power connector (17) and the motor three-phase connector (16) are electrically connected.

5. The temperature-controlled oil-cooled transmission oil pump structure according to claim 1, characterized in that: The bottom of the pump body (1) is also connected to a filter assembly (18), and the eccentric gear (6) is located between the filter assembly (18) and the partition plate (2).

6. A temperature-controlled oil-cooled transmission oil pump structure according to claim 5, characterized in that: The filter assembly (18) comprises a filter mounting seat (19), a filter body (20) and a filter fixing pressure ring (21); the upper end of the filter mounting seat (19) is connected to the bottom of the pump body (1); a filter oil through hole (22) is formed at the center of the filter mounting seat (19); and the filter body (20) is fixed between the filter mounting seat (19) and the filter fixing pressure ring (21).

7. A temperature-controlled oil-cooled transmission oil pump structure according to claim 6, characterized in that: The eccentric gear (6) comprises an outer gear ring (23) and an inner gear (24); the inner gear (24) is arranged inside the outer gear ring (23), the inner gear (24) is located at an eccentric position of the outer gear ring (23), and the center of the inner gear (24) is connected to the central shaft (5).

8. The temperature-controlled oil-cooled transmission oil pump structure according to claim 7, characterized in that: An oil gap (25) is formed between the outer gear ring (23) and the inner gear (24).

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