Anti-swing oil laser radar outer rotor motor and laser radar

Abstract

The application discloses an oil-throwing-preventing outer rotor motor of a laser radar and the laser radar. The outer rotor motor comprises a motor shaft, one end of which is provided with an upper shell and the other end of which is provided with a bottom shell. A rotor assembly comprises a bearing arranged on an outer circumferential wall of the motor shaft close to the upper shell and a rotor yoke arranged on an outer ring of the bearing. The rotor yoke has a first end close to the upper shell and a second end close to the bottom shell. A gap is formed between the first end and the upper shell. The upper shell has a ring part arranged around the outer circumferential wall of the first end. A stator assembly is arranged on the outer circumferential wall of the motor shaft close to the bottom shell. An oil storage groove comprises a first oil storage groove arranged on an inner wall of the first end of the rotor yoke and located on the outer circumferential wall of the bearing position and a second oil storage groove arranged on an inner wall of the ring part. The first oil storage groove is arranged on the inner wall of the rotor yoke corresponding to the outer circumferential wall of the bearing position, and the second oil storage groove is arranged on the inner wall of the ring part of the upper shell arranged around the outer circumferential wall of the rotor yoke. The first oil storage groove and the second oil storage groove are used for receiving oil leakage to the prism when the bearing fails, so that the point cloud failure is avoided.

Description

Technical Field

[0001] This invention relates to the field of lidar technology, and more specifically to a lidar external rotor motor with anti-oil-slinging capability and a lidar having the external rotor motor. Background Technology

[0002] Laser radar (LiDAR) is a radar system that uses laser beams to detect the position, velocity, and other characteristics of a target. Its working principle involves emitting a detection signal (laser beam) towards the target, then comparing the received signal reflected back from the target (target echo) with the emitted signal. After appropriate processing, information about the target can be obtained, such as its distance, azimuth, altitude, velocity, attitude, and even shape, thereby enabling target detection, tracking, and identification.

[0003] A lidar system mainly consists of a housing, a motor, and prisms. The motor is typically an external rotor motor, comprising a motor shaft, a stator assembly fixedly mounted on the shaft, a rotor assembly rotatably mounted on the shaft, and base shells fixed at both ends of the shaft. The rotor assembly includes bearings mounted on the shaft and a rotor housing or yoke mounted outside the bearings. The prisms are mounted on the outer periphery of the rotor assembly. When the bearings fail, oil leaks onto the outer prisms during rotor rotation, causing point cloud corruption and resulting in inaccurate or inability to detect, track, and identify targets. Although existing lidar systems employ relevant protective measures, further improvements are still needed. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this invention is to provide an oil-resistant external rotor motor and a lidar, which solves the problem that existing lidar external rotor bearings will leak oil into the prism when the bearings fail, leading to point cloud failure.

[0005] The technical solution of this invention is: One objective of this invention is to provide an external rotor motor for laser radar that prevents oil splattering, comprising: The motor shaft has an upper housing at one end and a bottom housing at the other end. A rotor assembly includes a bearing disposed on the outer peripheral wall of the motor shaft near one end of the upper housing and a rotor yoke disposed on the outer ring of the bearing. The rotor yoke has a first end near the upper housing and a second end near the bottom housing. There is a gap between the first end and the upper housing. The upper housing has an annular portion surrounding the outer periphery of the first end. The stator assembly is located on the outer peripheral wall of the motor shaft near the bottom housing. The oil reservoir includes a first oil reservoir located on the inner wall of the first end of the rotor yoke and on the outer periphery of the bearing position, and a second oil reservoir located on the inner wall of the ring portion.

[0006] Optionally, the first oil storage tank and / or the second oil storage tank are both annular grooves circumferentially arranged on their respective inner walls.

[0007] Optionally, the upper position of the second oil storage tank is higher than the upper position of the first oil storage tank.

[0008] Optionally, a radially inwardly extending convex ring is provided on the inner wall of the first end of the rotor yoke. The convex ring is located on the axial outer side of the first oil reservoir, and there is a gap between the inner peripheral wall of the convex ring and the outer ring of the bearing.

[0009] Optionally, the number of bearings is two, and the first oil reservoir is located on the tangent or extension of the tangent of the outer ring of the bearing near the first end of the rotor yoke.

[0010] Optionally, the inner peripheral wall of the rotor yoke is provided with a radially protruding bearing stop, and the facing end faces of the two bearings respectively abut against the two axial surfaces of the bearing stop.

[0011] Optionally, the motor shaft is a stepped shaft, with the other end face of the bearing away from the first end of the rotor yoke abutting against the stepped surface of the motor shaft.

[0012] Optionally, a pressure spring is fitted on the motor shaft, with the two ends of the pressure spring abutting against the upper end face of the bearing near the first end of the rotor yoke and the bottom end face of the upper shell, respectively.

[0013] Optionally, the outer ring of the bearing corresponding to the motor shaft is provided with a radially inwardly recessed annular groove, and an O-ring is provided in the annular groove. The outer circumference of the O-ring is pressed against the inner ring of the corresponding bearing.

[0014] Another object of the present invention is to provide a lidar, including a prism and an anti-oil-slinging lidar external rotor motor as described in any of the above claims, wherein the prism is fixed to the outer periphery of the rotor assembly.

[0015] Compared with the prior art, the advantages of the present invention are: The present invention provides an oil-slinging-proof external rotor motor for lidar. This motor features a first oil reservoir on the inner wall of the rotor yoke corresponding to the outer periphery of the bearing, and a second oil reservoir on the inner wall of the ring surrounding the outer periphery of the rotor yoke on the upper shell. When the bearing fails, oil will fly out tangentially from the bearing's outer ring and fall into the first and second oil reservoirs. This effectively prevents oil from slinging out and leaking onto the prism through the gap between the rotor yoke and the upper shell, thus avoiding point cloud failure. This invention solves the problem of existing lidar external rotor motors causing oil leakage onto the prism and resulting in point cloud failure when the bearing fails, thereby improving the safety of the radar. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a cross-sectional structural diagram of the anti-oil-slinging lidar external rotor motor according to an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A of the external rotor motor of the laser radar for preventing oil spillage.

[0017] The components are: 1. Motor shaft; 2. Upper housing; 20. Second oil reservoir; 21. Ring; 3. Bottom housing; 4. Rotor yoke; 40. First oil reservoir; 41. Convex ring; 42. Bearing stop; 5. Stator assembly; 6. Bearing; 7. Rotor magnet; 8. Prism; 9. Ring groove; 10. O-ring; 11. Pressure spring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0019] Example: See Figures 1 to 2As shown, this embodiment of an anti-oil-slinging lidar external rotor motor includes a motor shaft 1, an upper shell 2, a bottom shell 3, a rotor assembly, a stator assembly 5, a rotor magnet 7, and a pressure spring 11. The motor shaft 1 is a stepped shaft, meaning one end has a larger diameter and the other end has a smaller diameter. The upper shell 2 and the bottom shell 3 are respectively fixed to both ends of the motor shaft 1. Specifically, the upper shell 2 is fixed to the end of the motor shaft 1 with a smaller diameter, and the bottom shell 3 is fixed to the end of the motor shaft 1 with a larger diameter. More specifically, the end of the motor shaft 1 with a larger diameter is fixed to the bottom shell 3 by an interference fit. A blind hole is provided on the end of the motor shaft 1 with a smaller diameter, and the upper shell 2 is fixedly connected to the blind hole of the motor shaft 1 by screws. The rotor assembly includes a bearing 6, a rotor yoke 4, and a rotor magnet 7. The bearing 6 is sleeved on the end of the motor shaft 1 with a smaller diameter, and the rotor yoke 4 is fixed to the outer periphery of the bearing 6. The rotor yoke 4 has a first end and a second end, with the first end positioned close to the upper shell 2. Figure 1 The upper end of the rotor yoke 4, the second end, is located near the bottom shell 3, i.e., as shown in the figure. Figure 1 The rotor yoke 4 has its lower end fixed to the inner wall of its second end, where the rotor magnet 7 is fixed. The stator assembly 5 is fixed to the larger diameter end of the motor shaft 1 and located on the inner circumference of the rotor magnet 7. The rotor yoke 4 is directly driven to reflect laser light from the periphery of the stator assembly 5. The inner end face of the upper shell 2 is also as described above. Figure 1 The lower end face of the upper shell 2 shown has a downwardly protruding ring 21. The ring 21 surrounds the outer periphery of the first end of the rotor yoke 4, and there is a gap between the inner wall of the ring 21 and the outer wall of the first end of the rotor yoke 4, and between the inner end face of the upper shell 2 and the end face of the first end of the rotor yoke 4, that is, the upper end face of the rotor yoke 4. A first oil reservoir 40 is provided on the inner wall of the first end of the rotor yoke 4, and a second oil reservoir 20 is provided on the inner wall of the ring 21. The first oil reservoir 40 is located on the outer periphery of the bearing 6. When bearing 6 ages or fails, oil will fly out tangentially from the outer ring of bearing 6. By setting a first oil reservoir 40 above the outer ring of bearing 6, oil can be collected when bearing 6 ages or fails. The first oil reservoir 40 can collect most of the oil. Then, a second oil reservoir 20 is set on the inner wall of the downward protruding ring 21 at the bottom of the upper shell 2 of the outer periphery of rotor yoke 4 to collect oil from the gap between motor shaft 1 and the first end of rotor yoke 4 and the gap between the inner end face of upper shell 2 and the end face of the first end of rotor yoke 4. This can further improve the oil collection capacity and effectively prevent oil from leaking through the gap between rotor yoke 4 and upper shell 2 onto the prism 8 on the outer periphery of rotor yoke 4, causing point cloud failure, thus improving the safety of lidar.

[0020] According to some preferred embodiments of the present invention, the first oil reservoir 40 and the second oil reservoir 20 are both annular grooves circumferentially arranged on their respective inner walls. In some alternative embodiments, the first oil reservoir 40 and / or the second oil reservoir 20 may also be multiple grooves circumferentially spaced on their respective inner walls.

[0021] According to some preferred embodiments of the present invention, such as Figure 2 As shown, the upper position of the second oil storage tank 20 is higher than the upper position of the first oil storage tank 40. In this embodiment, for ease of description, the upper end of the oil storage tank is described as the upper position, and the lower end of the oil storage tank is described as the lower position. Figure 1 As shown, the upper position of the first oil storage tank 40 is located between the upper and lower positions of the second oil storage tank 20. The purpose of this design is to shorten the travel path of the oil spill and further reduce oil spill leakage.

[0022] To further reduce oil spillage, such as Figure 1 As shown, a radially inwardly protruding ring 41 is provided on the inner wall of the first end of the rotor yoke 4. The ring 41 is located on the axial outer side of the first oil reservoir 40, and there is a gap between the inner circumferential wall of the ring 41 and the outer ring of the bearing 6. The ring 41 serves as a barrier, effectively preventing oil leakage from the first oil reservoir 40 and also effectively preventing oil leakage caused by the bearing 6 aging or failing and the oil inside the bearing 6 flying out tangentially from the outer ring of the bearing 6.

[0023] like Figure 1 and Figure 2 As shown, in this embodiment, there are two bearings 6, which are separated by a radially inwardly protruding bearing stop 42 provided on the inner wall of the rotor yoke 4. That is to say, the bearing 6 closer to the first end is... Figure 1 The lower end face of the upper bearing 6 and the bearing 6 near the second end are also shown as... Figure 1 The upper end face of the lower bearing 6 shown abuts against the two axial end faces of the bearing stop 42, respectively. Figure 1 The bearing 6 is shown on its upper and lower end faces. According to some preferred embodiments of the invention, the first oil reservoir 40 is located on the tangent or extension of the tangent of the outer ring of the bearing 6 near the first end of the rotor yoke 4. A specific embodiment, such as... Figure 1 As shown, the projection of the upper portion of the outer ring of the upper bearing 6 onto the inner wall of the rotor yoke 4 falls on the first oil reservoir 40. This means that a portion of the upper bearing 6 extends into the opening of the first oil reservoir 40, allowing oil to flow into the first oil reservoir 40 through the tangent of the bearing's outer ring during operation. Figure 1As shown, the lower end face of the bearing 6 abuts against the stepped surface of the motor shaft 1. Regarding the structure of the bearing stop 42, it can be an annular bearing stop 42 circumferentially arranged on the inner wall of the rotor yoke 4, or it can be composed of multiple baffles spaced circumferentially along the inner wall of the rotor yoke 4. As for the bearing 6, it can be a conventional ball bearing 6, without further detailed description or limitation.

[0024] According to a preferred embodiment of the present invention, such as Figure 1 As shown, annular grooves 9 are formed on the outer peripheral wall of the smaller diameter end of the motor shaft 1, corresponding to the positions of the inner rings of the two bearings 6. An O-ring 10 is provided in the annular groove 9. The O-ring 10 has a certain amount of compression and is a conventional O-ring 10 known to those skilled in the art, such as a rubber ring. The outer wall of the O-ring 10 is pressed against the inner ring of the corresponding bearing 6, which has the functions of self-aligning and absorbing vibration.

[0025] like Figure 1 As shown, a pressure spring 11 is fitted onto the smaller diameter end of the motor shaft 1. The two ends of the pressure spring 11 abut against the upper end face of the bearing 6, specifically the upper end face of the inner ring of the bearing 6 and the inner end face of the upper shell 2. The pressure spring 11 is used to float and connect the inner ring of the bearing 6.

[0026] This invention also provides a lidar, including a prism 8 and an anti-oil-slinging lidar external rotor motor as described in the above embodiment. The prism 8 is fixed to the outer periphery of the rotor assembly, specifically the rotor yoke 4. Figure 1 As shown, the outer periphery of the rotor yoke 4 is stepped; specifically, the outer periphery of the rotor yoke 4 has two stepped surfaces. The inner wall of the prism 8 has radially inwardly protruding overlapping portions for overlapping the lower stepped surface of the rotor yoke 4. The inner periphery of the upper end of the prism 8 is inverted conical, which can be used to install a pressure plate. Because the external rotor motor of the above embodiment is used, it at least has the beneficial effects of the external rotor motor of the above embodiment, namely, it can effectively prevent oil leakage from bearing 6 due to failure, avoid point cloud failure, and ensure the detection, tracking, and identification of the lidar.

[0027] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An external rotor motor for laser radar that prevents oil splattering, comprising: The motor shaft (1) has an upper shell (2) at one end and a bottom shell (3) at the other end; The rotor assembly includes a bearing (6) disposed on the outer peripheral wall of the motor shaft (1) near the upper shell (2) and a rotor yoke (4) disposed on the outer ring of the bearing (6). The rotor yoke (4) has a first end near the upper shell (2) and a second end near the bottom shell (3). There is a gap between the first end and the upper shell (2). The upper shell (2) has a ring portion (21) surrounding the outer periphery of the first end. The stator assembly (5) is located on the outer peripheral wall of the motor shaft (1) near the bottom shell (3); The oil reservoir includes a first oil reservoir (40) located on the inner wall of the first end of the rotor yoke (4) and on the outer periphery of the bearing (6), and a second oil reservoir (20) located on the inner wall of the ring portion (21). The first oil reservoir (40) is located on the tangent or extension of the tangent of the outer ring of the bearing (6) near the first end of the rotor yoke (4).

2. The anti-oil-slinging lidar external rotor motor according to claim 1, characterized in that, The first oil storage tank (40) and / or the second oil storage tank (20) are both annular grooves circumferentially arranged on their respective inner walls.

3. The anti-oil-slinging lidar external rotor motor according to claim 1 or 2, characterized in that, The upper position of the second oil storage tank (20) is higher than the upper position of the first oil storage tank (40).

4. The anti-oil-slinging lidar external rotor motor according to claim 1, characterized in that, The inner wall of the first end of the rotor yoke (4) is provided with a radially inwardly extending protruding ring (41). The protruding ring (41) is located on the axial outer side of the first oil reservoir (40), and there is a gap between the inner peripheral wall of the protruding ring (41) and the outer ring of the bearing (6).

5. The anti-oil-slinging lidar external rotor motor according to claim 1, characterized in that, The number of bearings (6) is two.

6. The anti-oil-slinging lidar external rotor motor according to claim 5, characterized in that, The inner circumferential wall of the rotor yoke (4) is provided with a radially protruding bearing stop (42), and the facing end faces of the two bearings (6) respectively abut against the two axial surfaces of the bearing stop (42).

7. The anti-oil-slinging lidar external rotor motor according to claim 6, characterized in that, The motor shaft (1) is a stepped shaft, and the other end face of the bearing (6) at the first end away from the rotor yoke (4) abuts against the stepped surface of the motor shaft (1).

8. The anti-oil-slinging lidar external rotor motor according to claim 5, characterized in that, A pressure spring (11) is sleeved on the motor shaft (1). The two ends of the pressure spring (11) abut against the upper end face of the bearing (6) near the first end of the rotor yoke (4) and the bottom end face of the upper shell (2), respectively.

9. The anti-oil-slinging lidar external rotor motor according to claim 5, characterized in that, The outer ring of the motor shaft (1) corresponding to the bearing (6) is provided with a radially inwardly recessed annular groove (9), and an O-ring (10) is provided in the annular groove (9). The outer circumference of the O-ring (10) is pressed against the inner ring of the corresponding bearing (6).

10. A lidar, characterized in that, The device includes a prism (8) and an anti-oil-slinging laser radar external rotor motor as described in any one of claims 1-9, wherein the prism (8) is fixed to the outer periphery of the rotor assembly.

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