Oil-cooled motor bearing protection structure

Abstract

The utility model belongs to the technical field of motor cooling, and provides an oil-cooled motor bearing protection structure, which comprises a motor shell, a motor shaft and an input shaft, wherein the motor shaft is arranged along the axial direction of the motor shell, and a plurality of bearings are mounted on the surface of the motor shaft; the input shaft is coaxially arranged in the motor shaft; the motor housing is provided with an oil cooling channel, and the oil cooling channel is communicated with a part of the bearing. A detachable filter element is arranged in the oil cooling channel, and cooling lubricating oil flows through the filter element and then reaches part of the bearings. According to the utility model, the detachable filter element is arranged in the oil cooling channel, so that oil is filtered by the filter element when reaching the bearing, and the cleanness of the oil for cooling and lubricating the bearing is ensured; the carbon fiber conductive brush is added in the rotor of the position sensor, equivalently, a low-impedance path is connected in parallel at two ends of the inner ring of the bearing, so that the voltage of the inner ring and the outer ring of the bearing cannot be overlarge, the problem of instantaneous discharge is solved, and the service life of the bearing is further protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor cooling, and in particular relates to an oil-cooling motor bearing protection structure. Background Art

[0002] As the new energy vehicle market continues to demand higher performance from electric vehicle powertrains, the volume and power density requirements for electric drive systems are also increasing, requiring the powertrain structure to be as compact and lightweight as possible. Water-cooled motors are gradually being replaced by oil-cooled motors. The bearings in oil-cooled motors are no longer traditional, independently greased bearings, but are now lubricated and cooled with transmission oil. Due to the inherent impurities generated by the entire electric drive during manufacturing and operation, these impurities flow into the bearing raceways with the oil. The rolling contact of the balls can severely damage the bearing life. In the short term, this can cause abnormal vehicle noise and customer complaints. In the long term, this can damage the powertrain and prevent it from outputting power. Furthermore, the voltage generated by the switching of new energy variable-frequency electric drives can lead to electrical corrosion of the bearings, shortening their lifespan. Utility Model Content

[0003] In view of the problems in the background technology, the present invention proposes an oil-cooled motor bearing protection structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An oil-cooled motor bearing protection structure comprises: a motor housing, a motor shaft and an input shaft;

[0006] The motor shaft is arranged along the axial direction of the motor housing, and a plurality of bearings are installed on the surface;

[0007] The input shaft is coaxially arranged inside the motor shaft and is used to transmit power to the motor shaft;

[0008] The motor housing is provided with an oil cooling channel, and the oil cooling channel is connected to part of the bearing;

[0009] A detachable filter element is provided in the oil cooling channel. Along the flow direction of the cooling lubricating oil in the oil cooling channel, the cooling lubricating oil flows through the filter element and reaches part of the bearings.

[0010] Preferably, the motor housing includes a motor casing and a motor end cover;

[0011] The motor housing is connected to the motor end cover in the axial direction and is connected to the bearings at corresponding positions in the radial direction;

[0012] The motor end cover is radially connected to the bearing at the corresponding position.

[0013] Preferably, the oil cooling channel includes:

[0014] The housing oil inlet channel is opened in the motor housing and arranged along the axial direction of the motor housing;

[0015] The housing oil outlet channel is provided in the motor housing and is radially away from the housing oil inlet channel and is arranged along the axial direction of the motor housing;

[0016] The housing oil inlet channel and the housing oil outlet channel are both connected to the inner cavity of the motor housing;

[0017] The end cover oil inlet channel is provided in the motor end cover, the inlet of the end cover is axially connected to the housing oil inlet channel, and the outlet of the end cover is radially connected to the first oil outlet channel and the second oil outlet channel;

[0018] The ends of the first oil outlet channel and the second oil outlet channel away from the first end cover oil inlet channel are both connected to the corresponding bearings;

[0019] The sum of the diameters of the first oil outlet channel and the second oil outlet channel is smaller than or equal to the diameter of the oil inlet channel of the end cover.

[0020] Preferably, the filter element is fixedly connected with a detachable bolt, and the detachable bolt is installed along the radial direction of the motor end cover, and is used to install the filter element end cover at the intersection of the axial and radial directions of the oil inlet channel.

[0021] Preferably, the filter element is provided with a filter element sealing ring along the circumference, and the filter element sealing ring is used to seal the detachable bolt along the radial direction.

[0022] Preferably, the bearing comprises a motor bearing and an output shaft bearing sequentially installed along the axial direction of the motor shaft;

[0023] The motor bearing corresponds to the first oil outlet channel;

[0024] The output shaft bearing corresponds to the second oil outlet channel.

[0025] Preferably, a motor oil seal and an output shaft oil seal are further provided along the axial direction of the motor shaft;

[0026] The motor oil seal is located between the motor bearing and the output shaft bearing and is located on the motor shaft;

[0027] The output shaft oil seal is located on a side of the output shaft bearing away from the motor bearing and is located on the motor shaft.

[0028] Preferably, a motor rotor is mounted on the motor shaft, and a motor stator connected to the inner wall of the motor housing is provided on the circumference of the motor rotor.

[0029] Preferably, a position sensor stator and a position sensor rotor are also mounted on the motor shaft;

[0030] The position sensor stator is fixedly arranged relative to the motor shaft;

[0031] The position sensor rotor moves synchronously with the motor shaft and is rotationally connected to the position sensor stator.

[0032] Preferably, conductive fibers are embedded in the surface of the position sensor rotor facing the position sensor stator.

[0033] Beneficial effects of the utility model:

[0034] 1. The utility model sets a detachable filter element in the oil cooling channel, so that the oil is filtered through the filter element before reaching the bearing, ensuring that the oil for cooling and lubricating the bearing is clean;

[0035] 2. The utility model adds a carbon fiber conductive brush to the rotor of the position sensor, which is equivalent to connecting a low-impedance path in parallel at both ends of the inner ring of the bearing, ensuring that the voltage between the inner and outer rings of the bearing is not too large, solving the problem of instantaneous discharge and thus protecting the bearing life.

[0036] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures indicated in the description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic diagram of an oil-cooled motor bearing protection structure according to the present invention is shown;

[0039] Figure 2 Shown Figure 1 Magnified view of area A in the middle;

[0040] Figure 3 Shown Figure 1 Magnified view of area B in the middle;

[0041] Figure 4 Shows a schematic structural diagram of the position sensor stator / rotor.

[0042] In the figure: 1. Oil-cooled motor; 2. Motor housing; 201. Housing oil inlet channel; 202. Housing oil outlet channel; 3. Motor end cover; 301. End cover oil inlet channel; 3011. First oil outlet channel; 3012. Second oil outlet channel; 302. Removable bolts; 303. Filter element; 3031. Filter element sealing ring; 4. Motor stator; 5. Motor rotor; 6. Motor bearing; 7. Motor oil seal; 8. Output shaft bearing; 9. Output shaft oil seal; 10. Position sensor stator; 11. Position sensor rotor; 1101. Conductive fiber; 12. Motor shaft; 13. Input shaft. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] An oil-cooled motor bearing protection structure includes a motor housing, a motor shaft 12 and an input shaft 13; the motor shaft 12 is arranged along the axial direction of the motor housing and has a plurality of bearings installed on the surface; the input shaft 13 is coaxially arranged inside the motor shaft 12, and can transmit power to the motor shaft 12, driving the motor shaft 12 to rotate; the motor housing is provided with an oil cooling channel, and the oil cooling channel is connected to the bearings; a filter element 303 is provided in the oil cooling channel, and along the flow direction of the cooling lubricating oil in the oil cooling channel, the cooling lubricating oil flows through the filter element 303 and reaches some bearings.

[0045] In the above structure, a special oil cooling channel is designed to ensure that the bearing has sufficient oil for lubrication and cooling, ensuring the normal operation of the bearing. At the same time, a removable high-precision filter element 303 is added at the oil inlet of the bearing to ensure that the oil for cooling and lubricating the bearing is absolutely clean.

[0046] The following combination Figures 1-4 The oil-cooled motor bearing protection structure of the present invention is further described.

[0047] like Figure 1As shown, in an oil-cooled motor 1, the motor housing comprises a motor case 2 and a motor end cap 3. The motor case 2 is tightly connected to the motor end cap 3 axially and radially to corresponding bearings, thereby stabilizing the corresponding bearings and ensuring the stability of the motor structure. The motor end cap 3 is also radially connected to corresponding bearings. The motor shaft 12 is located axially of the motor case 2, and a motor rotor 5 is mounted on its surface. The motor stator 4, which is connected to the inner wall of the motor case 2, is mounted on the circumference of the motor rotor 5, together driving the motor's rotational motion.

[0048] In addition, if Figure 1 As shown, the oil cooling channel includes a housing oil inlet channel 201, a housing oil outlet channel 202, an end cover oil inlet channel 301, a first oil outlet channel 3011, and a second oil outlet channel 3012. Specifically, the housing oil inlet channel 201 is provided in the motor housing 2, axially extending from the motor housing 2 to the motor end cover 3. The housing oil outlet channel 202 is also provided in the motor housing 2, radially away from the housing oil inlet channel 201, and axially extending from the motor housing 2. Both the housing oil inlet channel 201 and the housing oil outlet channel 202 communicate with the inner cavity of the motor housing.

[0049] It should be noted that a branch is provided in the middle of the housing oil inlet channel 201 , and the branch is connected to the motor stator 4 , so that part of the cooling lubricating oil can reach the motor stator 4 through the branch.

[0050] like Figure 3 As shown, the end cover oil inlet channel 301 is opened in the motor end cover 3, the inlet is connected to the shell oil inlet channel 201 along the axial direction, and the outlet is provided with a fork in the radial direction, and the fork corresponds to the first oil outlet channel 3011 and the second oil outlet channel 3012 respectively; the first oil outlet channel 3011 and the second oil outlet channel 3012 are both connected to the corresponding bearings at one end away from the end cover oil inlet channel 301.

[0051] It should be noted that in Figure 1 In the oil cooling channel, the cooling lubricating oil enters the housing oil inlet channel 201, flows through the branch in the middle of the housing oil inlet channel 201 to the position of the motor stator 4, and the remaining portion enters the end cover oil inlet channel 301. At this time, the filter element 303 can filter the cooling lubricating oil, effectively improving the oil quality without leaking the oil. After the filter element 303 is processed, the cooling lubricating oil reaches the corresponding bearing through the first oil outlet channel 3011 and the second oil outlet channel 3012, providing lubrication. In addition, the sum of the diameters of the first oil outlet channel 3011 and the second oil outlet channel 3012 must be less than or equal to the diameter of the end cover oil inlet channel 301 to ensure that there is always oil in the first oil outlet channel 3011.

[0052] like Figure 2As shown, the filter element 303 is fixedly connected to a removable bolt 302. The removable bolt 302 is installed radially along the motor end cover 3 and is used to install the filter element 303 end cover at the intersection of the axial and radial directions of the end cover oil inlet passage 301. In addition, the filter element 303 is provided with a filter element sealing ring 3031 along the circumference, which is used to seal the removable bolt 302 radially.

[0053] It should be noted that through Figure 2 It can be seen that the oil inlet channel 301 of the end cover can be divided into an axial section and a radial section, wherein the filter element 303 is installed in the radial section.

[0054] like Figure 3 As shown, the bearings include a motor bearing 6 and an output shaft bearing 8, which are sequentially installed along the axial direction of the motor shaft 12. The motor bearing 6 corresponds to the first oil outlet channel 3011, and the output shaft bearing 8 corresponds to the second oil outlet channel 3012. Furthermore, a motor oil seal 7 and an output shaft oil seal 9 are also provided along the axial direction of the motor shaft 12. The motor oil seal 7 is located between the motor bearing 6 and the output shaft bearing 8, and is located on the motor shaft 12. The output shaft oil seal 9 is located on the side of the output shaft bearing 8 away from the motor bearing 6, and is also located on the motor shaft 12.

[0055] It should be noted that the motor oil seal 7 separates the motor bearing 6 and the output shaft bearing 8, which can prevent impurities in the cooling lubricating oil after passing through one bearing from contacting the other bearing, thereby ensuring the cooling and lubricating effect of the cooling lubricating oil.

[0056] It needs to be further explained that in Figure 3 Each bearing is equipped with an oil seal (motor oil seal 7 and output shaft oil seal 9) to store and prevent the oil used to lubricate and cool the bearings. The oil below the motor can flow out through the housing oil outlet channel 202, undergo storage (not shown), and undergo general filtration (not shown) before re-entering the housing oil inlet channel 201 for circulation.

[0057] Combine Figure 1 and Figure 4 The motor shaft 12 is also mounted with a position sensor stator 10 and a position sensor rotor 11. The position sensor stator 10 is fixed relative to the motor shaft 12. The position sensor rotor 11 moves synchronously with the motor shaft 12 and is rotationally connected to the position sensor stator 10. Furthermore, conductive fibers 1101 are embedded in the surface of the position sensor rotor 11 facing the position sensor stator 10.

[0058] It should be noted that the position sensor rotor 11 is generally made of steel. Figure 1 and Figure 4Flexible conductive fibers 1101 are embedded in the surface of the position sensor rotor 11 to reduce the potential difference between the inner and outer rings of the bearing without affecting the operation of the position sensor, ensuring that the inner and outer rings of the motor bearing 6 do not generate excessive shaft voltage, thereby protecting the bearing.

[0059] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An oil-cooled motor bearing protection structure, characterized in that: include: a motor housing, a motor shaft (12) and an input shaft (13); The motor shaft (12) is arranged along the axial direction of the motor housing, and a plurality of bearings are mounted on the surface; The input shaft (13) is coaxially arranged inside the motor shaft (12) and is used to transmit power to the motor shaft (12); The motor housing is provided with an oil cooling channel, and the oil cooling channel is connected to part of the bearing; A detachable filter core (303) is provided in the oil cooling channel. Along the flow direction of the cooling lubricating oil in the oil cooling channel, the cooling lubricating oil flows through the filter core (303) and reaches part of the bearings.

2. The oil-cooled motor bearing protection structure according to claim 1, characterized in that: The motor housing comprises a motor casing (2) and a motor end cover (3); The motor housing (2) is connected to the motor end cover (3) in the axial direction and is connected to the bearings at corresponding positions in the radial direction; The motor end cover (3) is radially connected to the bearing at the corresponding position.

3. The oil-cooled motor bearing protection structure according to claim 2, characterized in that: The oil cooling channel includes: The housing oil inlet channel (201) is opened in the motor housing (2) and is arranged along the axial direction of the motor housing (2); A housing oil outlet passage (202) is provided in the motor housing (2) and radially away from the housing oil inlet passage (201), and is arranged axially along the motor housing (2); The housing oil inlet channel (201) and the housing oil outlet channel (202) are both in communication with the inner cavity of the motor housing; An end cover oil inlet channel (301) is provided in the motor end cover (3), the inlet of which is axially connected to the housing oil inlet channel (201), and the outlet of which is radially connected to the first oil outlet channel (3011) and the second oil outlet channel (3012); The ends of the first oil outlet channel (3011) and the second oil outlet channel (3012) away from the end cover oil inlet channel (301) are both connected to corresponding bearings; The sum of the diameters of the first oil outlet channel (3011) and the second oil outlet channel (3012) is less than or equal to the diameter of the end cover oil inlet channel (301).

4. The oil-cooled motor bearing protection structure according to claim 3, characterized in that: The filter element (303) is fixedly connected with a detachable bolt (302), and the detachable bolt (302) is installed along the radial direction of the motor end cover (3) and is used to install the filter element (303) end cover at the intersection of the axial and radial directions of the oil inlet channel (301).

5. The oil-cooled motor bearing protection structure according to claim 4, characterized in that: The filter element (303) is provided with a filter element sealing ring (3031) along the circumferential direction, and the filter element sealing ring (3031) is used to seal the detachable bolt (302) along the radial direction.

6. The oil-cooled motor bearing protection structure according to claim 3, characterized in that: The bearing comprises a motor bearing (6) and an output shaft bearing (8) which are sequentially installed along the axial direction of the motor shaft (12); The motor bearing (6) corresponds to the first oil outlet channel (3011); The output shaft bearing (8) corresponds to the second oil outlet channel (3012).

7. The oil-cooled motor bearing protection structure according to claim 6, characterized in that: A motor oil seal (7) and an output shaft oil seal (9) are also provided along the axial direction of the motor shaft (12); The motor oil seal (7) is located between the motor bearing (6) and the output shaft bearing (8), and is located on the motor shaft (12); The output shaft oil seal (9) is located on a side of the output shaft bearing (8) away from the motor bearing (6) and is located on the motor shaft (12).

8. The oil-cooled motor bearing protection structure according to any one of claims 1 to 7, characterized in that: A motor rotor (5) is mounted on the motor shaft (12), and a motor stator (4) connected to the inner wall of the motor housing (2) is provided on the circumference of the motor rotor (5).

9. The oil-cooled motor bearing protection structure according to claim 8, characterized in that: A position sensor stator (10) and a position sensor rotor (11) are also mounted on the motor shaft (12); The position sensor stator (10) is fixedly arranged relative to the motor shaft (12); The position sensor rotor (11) moves synchronously with the motor shaft (12) and is rotationally connected to the position sensor stator (10).

10. The oil-cooled motor bearing protection structure according to claim 9, characterized in that: Conductive fibers (1101) are embedded in the surface of the position sensor rotor (11) facing the position sensor stator (10).

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