Galvanometer motor and bearing thereof

Abstract

The invention relates to the technical field of optical scanning galvanometers, in particular to a galvanometer motor and a bearing thereof. Comprising an outer ring, and the inner wall of the outer ring is movably sleeved with a middle ring; an outer raceway is arranged between the inner wall of the outer ring and the outer wall of the middle ring; and a plurality of groups of outer ring balls are distributed in the outer raceway in an annular array. When the galvanometer motor works, the inner ring of the bearing swings back and forth at a high frequency within a corresponding angle range, and at the moment, the middle ring is driven to rotate at a low speed and a constant speed relative to the galvanometer motor, so that the outer ring balls and the inner ring balls are respectively in uniform rolling friction in an outer raceway formed by the outer ring and the middle ring and an inner raceway formed by the inner ring and the middle ring; the problem of abrasion caused by non-uniform rolling friction of the balls when a deep groove ball bearing is adopted for small-angle high-frequency swing of an existing galvanometer motor is solved, so that the service life of the bearing is prolonged, and the service life of the galvanometer motor is further prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of optical scanning galvanometers, and in particular relates to a galvanometer motor and a bearing thereof. Background Art

[0002] A galvanometer motor is a motor that converts electrical energy into vibration energy. It is mainly used in laser burners, scanners and other equipment. The galvanometer motor changes the optical path and scanning range through high-speed vibration and reflection of the mirror.

[0003] After searching, in the prior art, Chinese patent announcement number: CN118157391 B, announcement date: 2024-07-05, discloses a galvanometer motor, including: a stator assembly; a rotor assembly; a lens; a fixing frame, the fixing frame is an integrated structure; one end of the fixing frame is nested with the output end of the rotor assembly, and the locking member passes through the first connecting hole and the second connecting hole to lock the fixing frame and the rotor assembly together; the other end of the fixing frame is nested with the lens, and the lens is inserted into the first notch along the fixing protrusion, so that the fixing frame limits the front, back, left, and right sides of the lens. The fixing frame of the invention adopts an integrated structure, which reduces accessories, thereby reducing the use of adhesive and improving the stability of the connection; at the same time, the lens is inserted into the first notch along the fixing protrusion, so that the fixing frame limits the front, back, left, and right sides of the lens, avoiding radial displacement of the lens along the first notch during repeated swinging.

[0004] However, the galvanometer motor still has the following defects:

[0005] The traditional galvanometer motor uses two conventional deep groove ball bearings as rotating supports. This is because the galvanometer motor needs to swing back and forth at a high frequency within a small angle range when working. This small-angle and high-frequency swing will cause uneven rolling friction between the inner and outer rings of the bearing and the ball, thereby aggravating the wear of the bearing, shortening the service life of the bearing, and resulting in a short life of the galvanometer motor. Summary of the invention

[0006] In view of the above problems, the present invention provides a bearing, comprising an outer ring, a middle ring being movably sleeved on the inner wall of the outer ring; an outer raceway is provided between the inner wall of the outer ring and the outer wall of the middle ring; a plurality of groups of outer ring balls are distributed in an annular array in the outer raceway;

[0007] The inner ring is movably sleeved on the inner wall of the middle ring; an inner raceway is arranged between the inner wall of the middle ring and the outer wall of the inner ring; a plurality of groups of inner race balls are arranged in a circular array in the inner raceway;

[0008] The inner ring swings back and forth at a high frequency within the corresponding angle range, and by driving the middle ring to rotate at a low and uniform speed relative to the galvanometer motor, the outer ring balls and the inner ring balls roll and rub evenly in the outer and inner raceways respectively.

[0009] Furthermore, an outer ring retainer is provided in the outer raceway; each group of outer ring balls moves through the outer ring retainer.

[0010] Furthermore, an inner ring retainer is provided in the inner raceway; each group of inner ring balls moves through the inner ring retainer.

[0011] A galvanometer motor comprises a housing; a stator is arranged on the inner wall of the housing; a rotating shaft is arranged inside the stator; a first shaft diameter and a second shaft diameter are arranged at two ends of the rotating shaft respectively; a group of bearings are sleeved on the outer walls of the first shaft diameter and the second shaft diameter respectively; a lens fixture is drivingly connected to one end of the second shaft diameter away from the rotating shaft; a lens is arranged at one end of the lens fixture away from the second shaft diameter;

[0012] A driving motor is arranged in the housing; a driving shaft and a lower driving shaft diameter are arranged at two ends of the driving motor respectively; an upper driving shaft diameter is arranged at one end of the driving shaft away from the driving motor;

[0013] The housing is provided with a first transmission belt and a second transmission belt; the upper drive shaft diameter and the lower drive shaft diameter are respectively connected to a corresponding set of bearings through the first transmission belt and the second transmission belt;

[0014] By adjusting the preload force of the second transmission belt in advance, a group of bearings on the outer wall of the second shaft diameter can be subjected to the preload force toward the upper drive shaft diameter, thereby eliminating the clearance generated by the clearance fit.

[0015] Furthermore, a winding is sleeved on the outer wall of the rotating shaft; an elastic body is provided on the end of the bearing located at the second shaft diameter close to the rotating shaft; and a position sensor is provided on the inner wall of the housing on one side close to the first shaft diameter.

[0016] Furthermore, a first pulley is sleeved on the outer wall of the bearing located at the first shaft diameter; a second pulley is sleeved on the outer wall of the bearing located at the second shaft diameter; a third pulley is sleeved on the outer wall of the lower drive shaft diameter; a fourth pulley is sleeved on the outer wall of the upper drive shaft diameter; the first transmission belt is sleeved on the outer walls of the first pulley and the third pulley; the second transmission belt is sleeved on the outer walls of the second pulley and the fourth pulley.

[0017] Furthermore, the lens clamp includes a connecting column; the connecting column is connected to the second shaft diameter; a plurality of distance sensors are arranged in a circular array at the bottom of the connecting column; and a limiting column is arranged at one end of the connecting column away from the second shaft diameter.

[0018] Furthermore, a compensation groove is provided on one side wall of the connecting column close to the limiting column; four groups of electric push rods are distributed in a rectangular array on the inner wall of the compensation groove away from the limiting column; the output end of each group of electric push rods is ball-connected to the side wall of the limiting column close to the connecting column.

[0019] Furthermore, two groups of slide grooves are symmetrically provided on one side wall of the limit column away from the connecting column; two groups of clamping plates are symmetrically provided in the two groups of slide grooves; a plurality of reset rollers are distributed in a rectangular array on the opposite side walls of the two groups of clamping plates; a lens placement groove is provided on one side wall of the limit column away from the connecting column; two groups of grooves are symmetrically provided on the inner walls on both sides of the lens placement groove; a group of lens resistance sheets are provided on the opening of each group of grooves.

[0020] Furthermore, a plurality of groups of extrusion springs are arranged in a rectangular array on the opposite side walls of the two groups of lens contact plates; the other end of each group of extrusion springs is connected to the inner wall of one side of the corresponding group of grooves; an adjustment cavity is arranged in the limit column; a lens baffle is arranged in the adjustment cavity; the lens baffle is located directly below the lens placement groove; a plurality of groups of sensing touch pads are arranged at equal intervals on the top of the lens baffle; a group of pressure sensors is arranged between each group of sensing touch pads and the lens baffle.

[0021] The beneficial effects of the present invention are:

[0022] 1. When the galvanometer motor is working, the inner ring of the bearing swings back and forth at a high frequency within the corresponding angle range. At this time, the middle ring is driven to rotate at a low and uniform speed relative to the galvanometer motor, so that the outer ring balls and the inner ring balls roll and rub evenly in the outer raceway formed by the outer ring and the middle ring, and the inner raceway formed by the inner ring and the middle ring, respectively, avoiding the wear problem caused by the uneven rolling friction of the balls when the existing galvanometer motor uses deep groove ball bearings to swing at a small angle and high frequency, thereby improving the life of the bearing and then the life of the galvanometer motor.

[0023] 2. Driven by an external circuit, the rotating shaft can drive the lens to rotate back and forth relative to the galvanometer body through the second shaft diameter and the lens clamp, thereby changing the path of the light beam after reflection by the lens and realizing the control of the light beam. Since a group of bearings on the outer wall of the second shaft diameter are gap-connected with the outer shell and have radial clearance, by adjusting the preload force of the second transmission belt between the second pulley and the fourth pulley in advance, a group of bearings on the outer wall of the second shaft diameter can be subjected to a preload force in the direction of the fourth pulley, which can eliminate the clearance caused by the gap fit and thus improve the working accuracy of the galvanometer motor.

[0024] 3. By placing the lens in the lens placement groove, the lens contact pieces on both sides contact the two side walls of the lens under the elastic force of the corresponding extrusion springs, and then the bottom of the lens contacts the top of several groups of sensing contact pieces, and then the two groups of clamping plates are controlled to clamp the lens and make several groups of reset rollers contact the two side walls of the lens. When the pressure sensors at the bottom of several groups of sensing contact pieces detect that the lens is deflected, the lens can be reset by the several groups of reset rollers on the corresponding side, avoiding continuous deviation of the lens and improving the working stability of the galvanometer motor.

[0025] 4. By arranging several groups of distance sensors in a circular array at the bottom of the connecting column, the distance sensors can monitor the gap between the lens fixture and the second shaft diameter. When the monitoring data of several groups of distance sensors change, it indicates that the central axis of the lens fixture and the second shaft diameter is offset from the overlapping state. At this time, compensation and reset can be performed by individually controlling the extension and retraction of four groups of electric push rods, and the lens angle in the initial state can be adjusted by individually controlling the four groups of electric push rods, thereby increasing the working range of the galvanometer motor and improving the use effect of the galvanometer motor.

[0026] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces 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 creative work.

[0028] Figure 1 A schematic diagram of the structure of a galvanometer motor according to an embodiment of the present invention is shown;

[0029] Figure 2 A cross-sectional schematic diagram of a galvanometer motor according to an embodiment of the present invention is shown;

[0030] Figure 3 A schematic structural diagram of a lens clamp according to an embodiment of the present invention is shown;

[0031] Figure 4 A cross-sectional schematic diagram of a lens clamp according to an embodiment of the present invention is shown;

[0032] Figure 5 The embodiment of the present invention is shown Figure 4 An enlarged schematic diagram of point A;

[0033] Figure 6 A schematic structural diagram of a first bearing according to an embodiment of the present invention is shown;

[0034] Figure 7 A schematic cross-sectional view of a first bearing according to an embodiment of the present invention is shown.

[0035] In the figure: 1, housing; 2, lower housing; 3, upper housing; 4, lens fixture; 5, lens; 6, stator; 7, rotating shaft; 8, first shaft diameter; 9, second shaft diameter; 10, bearing; 11, limiting pin; 12, winding; 13, elastic body; 14, driving motor; 15, driving shaft; 16, upper driving shaft diameter; 17, lower driving shaft diameter; 18, position sensor; 19, first pulley; 20, second pulley; 21, third pulley; 22, fourth pulley; 23, first transmission belt; 24, second transmission belt; 401, connecting column; 402, limiting column; 403, distance sensor; 404, slide groove; 405, clamping plate; 406, reset roller; 407, lens placement groove; 408, lens resistance plate; 409, compensation groove; 410, electric push rod; 411, groove; 412, extrusion spring; 413, adjustment chamber; 414, double-ended motor; 415, lead screw; 416, slider; 417, lens baffle; 418, induction contact plate; 419, pressure sensor; 1001, outer ring; 1002, middle ring; 1003, inner ring; 1004, outer ring retainer; 1005, outer ring ball; 1006, inner ring retainer; 1007, inner ring ball. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0037] The embodiment of the present invention provides a galvanometer motor and a bearing thereof, including a housing 1. For example, Figure 1 and Figure 2As shown, a lower cover shell 2 is provided at the bottom of the shell 1; an upper cover shell 3 is provided at the top of the shell 1; a lens fixture 4 is provided at the top center of the upper cover shell 3; a lens 5 is provided at the end of the lens fixture 4 away from the upper cover shell 3; a stator 6 is provided on the inner wall of the shell 1; a rotating shaft 7 is provided in the stator 6; a first shaft diameter 8 and a second shaft diameter 9 are provided at both ends of the rotating shaft 7 respectively; a group of bearings 10 are sleeved on the outer walls of the first shaft diameter 8 and the second shaft diameter 9 respectively; the end of the second shaft diameter 9 away from the rotating shaft 7 is connected to the lens fixture 4, and a limiting pin 11 is provided at the connection; a winding 12 is sleeved on the outer wall of the rotating shaft 7; an elastic body 13 is provided at the end of the bearing 10 located at the second shaft diameter 9 close to the rotating shaft 7; a driving motor 14 is provided in the shell 1; the two ends of the driving motor 14 are respectively A driving shaft 15 and a lower driving shaft diameter 17 are provided; an upper driving shaft diameter 16 is provided at one end of the driving shaft 15 away from the driving motor 14; a position sensor 18 is provided on the inner wall of the housing 1 on one side close to the first shaft diameter 8; a first pulley 19 is sleeved on the outer wall of the bearing 10 located at the first shaft diameter 8; a second pulley 20 is sleeved on the outer wall of the bearing 10 located at the second shaft diameter 9; a third pulley 21 is sleeved on the outer wall of the lower driving shaft diameter 17; a fourth pulley 22 is sleeved on the outer wall of the upper driving shaft diameter 16; a first transmission belt 23 is sleeved on the outer wall of the first pulley 19; the first transmission belt 23 is sleeved on the outer wall of the third pulley 21; a second transmission belt 24 is sleeved on the outer wall of the second pulley 20; the second transmission belt 24 is sleeved on the outer wall of the fourth pulley 22.

[0038] When the galvanometer motor is working, driven by an external circuit, the rotating shaft 7 can drive the lens 5 to rotate back and forth relative to the galvanometer body through the second shaft diameter 9 and the lens clamp 4, thereby changing the path of the light beam after reflection by the lens, and realizing the control of the light beam. Since a group of bearings 10 on the outer wall of the second shaft diameter 9 is gap-connected with the outer shell 1 and has a certain radial clearance, by adjusting the preload force of the second transmission belt 24 between the second pulley 20 and the fourth pulley 22 in advance, the group of bearings 10 on the outer wall of the second shaft diameter 9 can be subjected to a preload force in the direction of the fourth pulley 22, which can eliminate the clearance caused by the gap fit, thereby improving the working accuracy of the galvanometer motor.

[0039] For example, Figure 3 , Figure 4 and Figure 5As shown, the lens clamp 4 includes a connecting column 401; the connecting column 401 is connected to the second shaft diameter 9; a plurality of distance sensors 403 are arranged in a circular array at the bottom of the connecting column 401; a limiting column 402 is arranged at one end of the connecting column 401 away from the second shaft diameter 9; a compensation groove 409 is opened on a side wall of the connecting column 401 close to the limiting column 402; four groups of electric push rods 410 are arranged in a rectangular array on the inner wall of the side of the compensation groove 409 away from the limiting column 402; each group of the electric push rods 410 The output ends are all ball-connected with the side wall of the limiting column 402 close to the connecting column 401; two groups of slide grooves 404 are symmetrically opened on the side wall of the limiting column 402 away from the connecting column 401; two groups of clamping plates 405 are symmetrically arranged in the two groups of slide grooves 404; a plurality of groups of reset rollers 406 are distributed in a rectangular array on the side walls opposite to the two groups of clamping plates 405; a lens placement groove 407 is opened on the side wall of the limiting column 402 away from the connecting column 401; two groups of grooves 407 are symmetrically opened on the inner walls on both sides of the lens placement groove 407 11; a group of lens abutment sheets 408 are provided on the opening of each group of the grooves 411; a plurality of groups of extrusion springs 412 are arranged in a rectangular array on the opposite side walls of the two groups of the lens abutment sheets 408; the other end of each group of the extrusion springs 412 is connected to the inner wall of one side of the corresponding group of grooves 411; an adjustment cavity 413 is provided in the limit column 402; a double-end motor 414 is provided at the center of the bottom inner wall of the adjustment cavity 413; a group of screw rods 415 are respectively connected to the two ends of the double-end motor 414; the adjustment Two groups of sliders 416 are slidably connected to the inner wall at the bottom of the section cavity 413; each group of the sliders 416 is threadedly connected to a corresponding group of screw rods 415; each group of the sliders 416 is transmission-connected to a corresponding group of clamping plates 405; a lens baffle 417 is provided in the adjustment cavity 413; the lens baffle 417 is located directly below the lens placement groove 407; a plurality of groups of sensing touch pieces 418 are evenly spaced at the top of the lens baffle 417; a group of pressure sensors is provided between each group of the sensing touch pieces 418 and the lens baffle 417.

[0040] By placing the lens 5 in the lens placement groove 407, the lens contact pieces 408 on both sides are in contact with the two side walls of the lens under the elastic force of the corresponding extrusion springs 412, and then the bottom of the lens is in contact with the top of several groups of sensing contact pieces 418, and then the double-end motor 414 is controlled to drive the two groups of lead screws 415 to rotate. Under the threaded connection relationship between the two groups of lead screws 415 and the two groups of sliders 416, the two groups of sliders 416 move toward the opposite side, thereby driving the two groups of clamping plates 405 to clamp the lens 5 and making the several groups of reset rollers 406 contact the two side walls of the lens 5. Since the lens is in a high-frequency swinging state for a long time, when the pressure sensor 419 at the bottom of the several groups of sensing contact pieces 418 detects that the lens is deflected, the lens 5 can be reset by the several groups of reset rollers 406 on the corresponding side, thereby avoiding continuous deviation of the lens 5 and improving the working stability of the galvanometer motor. By arranging a plurality of groups of distance sensors 403 in a circular array at the bottom of the connecting column 401, the distance sensors 403 can monitor the gap between the lens clamp 4 and the second shaft diameter 9. When the monitoring data of the plurality of groups of distance sensors 403 change, it indicates that the central axis of the lens clamp 4 and the second shaft diameter 9 is offset from the overlapping state. At this time, compensation and reset can be performed by individually controlling the extension and retraction of four groups of electric push rods 410. In addition, the lens angle in the initial state can be adjusted by individually controlling the four groups of electric push rods 410, thereby increasing the working range of the galvanometer motor and improving the use effect of the galvanometer motor.

[0041] For example, Figure 6 and Figure 7 As shown, the bearing 10 comprises an outer ring 1001; a middle ring 1002 is movably sleeved on the inner wall of the outer ring 1001; an outer raceway is provided between the inner wall of the outer ring 1001 and the outer wall of the middle ring 1002; an inner ring 1003 is movably sleeved on the inner wall of the middle ring 1002; an inner raceway is provided between the inner wall of the middle ring 1002 and the outer wall of the inner ring 1003; the first pulley 19 and the second pulley 20 are respectively sleeved on the outer walls of a corresponding set of middle rings 1002; the first shaft diameter 8 and the second shaft diameter 8 are respectively sleeved on the outer walls of the ... The diameter 9 is respectively sleeved on the inner wall of a corresponding group of inner rings 1003; an outer ring retainer 1004 is arranged in the outer raceway; a plurality of groups of outer ring balls 1005 are arranged in a circular array in the outer raceway; each group of the outer ring balls 1005 are movable through the outer ring retainer 1004; an inner ring retainer 1006 is arranged in the inner raceway; a plurality of groups of inner ring balls 1007 are arranged in a circular array in the inner raceway; each group of the inner ring balls 1007 are movable through the inner ring retainer 1006.

[0042] During the operation of the galvanometer motor, the rotating shaft 7 and the lens 5 swing back and forth at a high frequency within a corresponding angle range relative to the housing 1, and the lower driving shaft diameter 17 and the upper driving shaft diameter 16 of the driving motor 14 respectively drive the middle rings 1002 of the two sets of bearings 10 to rotate at a low speed and uniform speed relative to the housing 1, so that the outer ring balls 1005 and the inner ring balls 1007 respectively roll and rub evenly in the outer raceway formed by the outer ring 1001 and the middle ring 1002 and the inner raceway formed by the inner ring 1003 and the middle ring 1002, thereby improving the life of the bearing 10 and further improving the life of the galvanometer motor.

[0043] When the galvanometer motor is working, the inner ring 1003 swings back and forth at a high frequency within the corresponding angle range. At this time, the middle ring 1002 is driven to rotate at a low and uniform speed relative to the galvanometer motor, so that the outer ring balls 1005 and the inner ring balls 1007 roll and rub evenly in the outer raceway formed by the outer ring 1001 and the middle ring 1002 and the inner raceway formed by the inner ring 1003 and the middle ring 1002, respectively, avoiding the wear problem caused by the uneven rolling friction of the balls when the existing galvanometer motor uses deep groove ball bearings to swing at a small angle and high frequency, thereby improving the life of the bearing 10 and further improving the life of the galvanometer motor.

[0044] Driven by an external circuit, the rotating shaft 7 can drive the lens 5 to rotate back and forth relative to the galvanometer body through the second shaft diameter 9 and the lens clamp 4, thereby changing the path of the light beam after reflection by the lens and realizing the control of the light beam. Since a group of bearings 10 on the outer wall of the second shaft diameter 9 are gap-connected with the outer shell 1 and have radial clearance, by adjusting the preload force of the second transmission belt 24 between the second pulley 20 and the fourth pulley 22 in advance, the group of bearings 10 on the outer wall of the second shaft diameter 9 can be subjected to a preload force in the direction of the fourth pulley 22, which can eliminate the clearance caused by the gap fit and thus improve the working accuracy of the galvanometer motor.

[0045] By placing the lens 5 in the lens placement groove 407, the lens contact pieces 408 on both sides are in contact with the two side walls of the lens under the elastic force of the corresponding extrusion springs 412, and then the bottom of the lens is in contact with the top of several groups of sensing contact pieces 418, and then the two groups of clamping plates 405 are controlled to clamp the lens 5 and make several groups of reset rollers 406 contact the two side walls of the lens 5. When the pressure sensors 419 at the bottom of several groups of sensing contact pieces 418 detect that the lens is deflected, the lens 5 can be reset by the several groups of reset rollers 406 on the corresponding side, so as to avoid continuous deviation of the lens 5 and improve the working stability of the galvanometer motor.

[0046] By arranging a plurality of groups of distance sensors 403 in a circular array at the bottom of the connecting column 401, the distance sensors 403 can monitor the gap between the lens clamp 4 and the second shaft diameter 9. When the monitoring data of the plurality of groups of distance sensors 403 change, it indicates that the central axis of the lens clamp 4 and the second shaft diameter 9 is offset from the overlapping state. At this time, compensation and reset can be performed by individually controlling the extension and retraction of four groups of electric push rods 410. In addition, the lens angle in the initial state can be adjusted by individually controlling the four groups of electric push rods 410, thereby increasing the working range of the galvanometer motor and improving the use effect of the galvanometer motor.

[0047] 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 substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bearing, comprising an outer ring (1001), characterized in that: The inner wall of the outer ring (1001) is movably sleeved with a middle ring (1002); an outer raceway is provided between the inner wall of the outer ring (1001) and the outer wall of the middle ring (1002); a plurality of groups of outer ring balls (1005) are distributed in a circular array in the outer raceway; An inner ring (1003) is movably sleeved on the inner wall of the middle ring (1002); an inner raceway is provided between the inner wall of the middle ring (1002) and the outer wall of the inner ring (1003); a plurality of groups of inner ring balls (1007) are distributed in a circular array in the inner raceway; The inner ring (1003) swings back and forth at a high frequency within a corresponding angle range, and drives the middle ring (1002) to rotate at a low and uniform speed relative to the galvanometer motor, so that the outer ring balls (1005) and the inner ring balls (1007) roll and rub evenly in the outer raceway and the inner raceway respectively.

2. A bearing according to claim 1, characterized in that: An outer ring retainer (1004) is arranged inside the outer raceway; each group of outer ring balls (1005) is movable and penetrates the outer ring retainer (1004).

3. A bearing according to claim 1, characterized in that: An inner ring retainer (1006) is provided in the inner raceway; each group of inner ring balls (1007) is movable and penetrates the inner ring retainer (1006).

4. A galvanometer motor, comprising a housing (1); characterized in that: A stator (6) is provided on the inner wall of the housing (1); a rotating shaft (7) is provided inside the stator (6); a first shaft diameter (8) and a second shaft diameter (9) are provided at both ends of the rotating shaft (7); a group of bearings (10) are sleeved on the outer walls of the first shaft diameter (8) and the second shaft diameter (9); a lens fixture (4) is drivingly connected to one end of the second shaft diameter (9) away from the rotating shaft (7); a lens (5) is provided at one end of the lens fixture (4) away from the second shaft diameter (9); A driving motor (14) is arranged in the housing (1); a driving shaft (15) and a lower driving shaft diameter (17) are respectively arranged at two ends of the driving motor (14); an upper driving shaft diameter (16) is arranged at one end of the driving shaft (15) away from the driving motor (14); A first transmission belt (23) and a second transmission belt (24) are provided in the housing (1); the upper drive shaft diameter (16) and the lower drive shaft diameter (17) are respectively connected to a corresponding set of bearings (10) through the first transmission belt (23) and the second transmission belt (24); By adjusting the preload force of the second transmission belt (24) in advance, a group of bearings (10) on the outer wall of the second shaft diameter (9) can be subjected to a preload force toward the upper drive shaft diameter (16), thereby eliminating the clearance generated by clearance fit.

5. The galvanometer motor according to claim 4, characterized in that: A winding (12) is sleeved on the outer wall of the rotating shaft (7); an elastic body (13) is provided at one end of the bearing (10) located at the second shaft diameter (9) close to the rotating shaft (7); and a position sensor (18) is provided on the inner wall of the housing (1) on one side close to the first shaft diameter (8).

6. The galvanometer motor according to claim 5, characterized in that: A first pulley (19) is sleeved on the outer wall of the bearing (10) located at the first shaft diameter (8); a second pulley (20) is sleeved on the outer wall of the bearing (10) located at the second shaft diameter (9); a third pulley (21) is sleeved on the outer wall of the lower drive shaft diameter (17); a fourth pulley (22) is sleeved on the outer wall of the upper drive shaft diameter (16); the first transmission belt (23) is sleeved on the outer walls of the first pulley (19) and the third pulley (21); and the second transmission belt (24) is sleeved on the outer walls of the second pulley (20) and the fourth pulley (22).

7. The galvanometer motor according to claim 4, characterized in that: The lens clamp (4) comprises a connecting column (401); the connecting column (401) is connected to the second axial diameter (9); a plurality of groups of distance sensors (403) are arranged in a circular array at the bottom of the connecting column (401); and a limiting column (402) is arranged at one end of the connecting column (401) away from the second axial diameter (9).

8. The galvanometer motor according to claim 7, characterized in that: A compensation groove (409) is provided on a side wall of the connecting column (401) close to the limiting column (402); four groups of electric push rods (410) are distributed in a rectangular array on the inner wall of the compensation groove (409) away from the limiting column (402); the output end of each group of the electric push rods (410) is ball-connected to a side wall of the limiting column (402) close to the connecting column (401).

9. The galvanometer motor according to claim 8, characterized in that: Two groups of slide grooves (404) are symmetrically provided on a side wall of the limiting column (402) away from the connecting column (401); two groups of clamping plates (405) are symmetrically provided in the two groups of slide grooves (404); a plurality of groups of reset rollers (406) are distributed in a rectangular array on the side walls opposite to each other of the two groups of clamping plates (405); a lens placement groove (407) is provided on a side wall of the limiting column (402) away from the connecting column (401); two groups of grooves (411) are symmetrically provided on the inner walls on both sides of the lens placement groove (407); and a group of lens abutment sheets (408) are provided on the opening of each group of grooves (411).

10. The galvanometer motor according to claim 9, characterized in that: A plurality of groups of extrusion springs (412) are arranged in a rectangular array on opposite side walls of the two groups of lens contact pieces (408); the other end of each group of extrusion springs (412) is connected to an inner wall of one side of a corresponding group of grooves (411); an adjustment cavity (413) is arranged in the limiting column (402); a lens baffle (417) is arranged in the adjustment cavity (413); the lens baffle (417) is located directly below the lens placement groove (407); a plurality of groups of sensing touch pieces (418) are arranged at equal intervals on the top of the lens baffle (417); and a group of pressure sensors is arranged between each group of sensing touch pieces (418) and the lens baffle (417).

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