Direct-current brush motor resistant to axial impact

Abstract

The invention discloses a direct current brush motor resistant to axial impact. The direct current brush motor comprises a cylindrical shell, a first bearing, a second bearing, a stator assembly, a rotor assembly, a first bearing limiting part and a second bearing limiting part. The first end of the motor shaft is installed in the first shaft hole through the first bearing, and due to the fact that the first bearing limiting part is arranged on the side, facing the cylindrical machine shell, of the first shaft hole, when the motor shaft is subjected to impact force facing the second end of the motor shaft, the first bearing limiting part can prevent the motor shaft from moving towards the direction of the second end of the motor shaft. The second end of the motor shaft is installed in the second shaft hole through the second bearing, and when the motor shaft is subjected to impact force towards the first end of the motor shaft, the second bearing limiting part can prevent the motor shaft from moving towards the first end of the motor shaft. Therefore, the first bearing limiting part and the second bearing limiting part can prevent the axial movement of the motor shaft, thereby improving the axial impact resistance of the DC brush motor.

Description

Technical Field

[0001] The present application relates to the technical field of electric motors, and in particular to a DC brushed motor resistant to axial impact. Background Art

[0002] Brushed DC motors are widely used in industrial control due to their low cost and easy control.

[0003] Brushed DC motors are often used in steering gear systems. However, due to the special use environment of steering gear systems, axial impact force is usually generated on the motor shaft of brushed DC motors. Brushed DC motors in related technologies are not designed with axial impact force in mind. Therefore, when brushed DC motors in related technologies are applied to steering gear systems, the structural strength of brushed DC motors is low and they cannot effectively cope with high axial impact force. It is urgent to propose a brushed DC motor that is resistant to axial impact to ensure the normal operation of brushed DC motors in steering gear systems. Summary of the invention

[0004] The embodiment of the present application provides a DC brush motor resistant to axial impact, which can solve the technical problems of low structural strength and weak axial impact resistance of DC brush motors in the prior art. The technical solution is as follows:

[0005] A motor comprises: a cylindrical casing, wherein the first end of the cylindrical casing has a first opening, the first opening is provided with a first end cover for blocking the first opening, and the center of the first end cover has a first axial hole; the second end of the cylindrical casing has a second end cover connected to the cylindrical casing, and the center of the second end cover has a second axial hole; a first bearing is arranged in the first axial hole; a second bearing is arranged in the second axial hole; a stator assembly is fixedly connected to the inner wall of the cylindrical casing; a rotor assembly is rotatably connected to the stator assembly, and the rotor assembly includes a motor shaft, and a A rotor core is disposed outside the motor shaft, and a rotor winding is mounted on the rotor core, the first end of the motor shaft is interference fit with the inner ring of the first bearing, and the second end of the motor shaft passes through the first bearing and is interference fit with the inner ring of the second bearing; a first bearing limiting portion is disposed on the side of the first shaft hole facing the cylindrical casing, and is used to prevent the first bearing from moving in a direction close to the cylindrical casing; a second bearing limiting portion is disposed on the side of the second shaft hole facing the cylindrical casing, and is used to prevent the second bearing from moving in a direction close to the cylindrical casing.

[0006] Optionally, the first bearing limiting portion is a first protrusion extending from one end of the first shaft hole toward the cylindrical casing in the direction of the central axis of the first shaft hole; there are multiple first protrusions, and the multiple first protrusions are evenly distributed circumferentially along the central axis of the first shaft hole.

[0007] Optionally, the first bearing limiting portion is a limiting ring, the center of the limiting ring has a first through hole for the motor shaft to pass through, the diameter of the first through hole is larger than the diameter of the motor shaft and smaller than the diameter of the first bearing outer ring, and the limiting ring is connected to the first end cover.

[0008] Optionally, the second bearing limiting portion is a second protrusion extending from one end of the second shaft hole toward the cylindrical casing in the direction of the central axis of the second shaft hole.

[0009] Optionally, the second protrusion is an annular retaining ring, which is fixedly connected to the inner wall of the second axial hole and is located at one end of the second axial hole facing the cylindrical casing.

[0010] Optionally, the first end of the rotor winding protrudes from the first end of the rotor core, and the second end of the rotor winding protrudes from the second end of the rotor core; the axial impact-resistant DC brushed motor also includes a buffer gasket, which has a second through hole for the motor shaft to pass through, and the buffer gasket is arranged between the first end of the rotor winding and the first end cover, and / or the buffer gasket is arranged between the second end of the rotor winding and the second end cover.

[0011] Optionally, the buffer gasket is a polyimide glass cloth plate, and the thickness of the polyimide glass cloth plate is 0.1-0.5 mm.

[0012] Optionally, the first end of the rotor winding is provided with an impact-resistant adhesive layer, and / or the second end of the rotor winding is provided with an impact-resistant adhesive layer; the impact-resistant adhesive layer is DG-2 adhesive, and the thickness of the DG-2 adhesive is 5-5.5 mm.

[0013] Optionally, the brushed DC motor has a commutator assembly, which includes a cylindrical insulating base and a plurality of pole pieces arranged on the insulating base in a circumferential array along the insulating base, wherein a ratio of a length L and a depth H of each pole piece embedded in the insulating base is ≥5.

[0014] Optionally, the first axial hole is a blind hole, and one end of the first axial hole facing away from the cylindrical casing is closed.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0016] A motor comprises: a cylindrical casing, a first bearing, a second bearing, a stator assembly, a rotor assembly, a first bearing stopper and a second bearing stopper. The first end of the motor shaft is installed in the first shaft hole through the first bearing, that is, the first end of the motor shaft is interference fit with the inner ring of the first bearing, and the outer ring of the first bearing is interference fit with the first shaft hole. Since the first bearing stopper is arranged on the side of the first shaft hole facing the cylindrical casing, when the motor shaft is subjected to an impact force toward the second end of the motor shaft, the first bearing stopper can block the motor shaft from moving in the direction of the second end of the motor shaft. Similarly, the second end of the motor shaft is installed in the second shaft hole through the second bearing, that is, the second end of the motor shaft is interference fit with the inner ring of the second bearing, and the outer ring of the second bearing is interference fit with the second shaft hole. Since the second bearing stopper is arranged on the side of the second shaft hole facing the cylindrical casing, when the motor shaft is subjected to an impact force toward the first end of the motor shaft, the second bearing stopper can block the motor shaft from moving in the direction of the first end of the motor shaft. In this way, when the motor shaft is subjected to an axial impact force, the first bearing stopper and the second bearing stopper can prevent the axial movement of the motor shaft, thereby improving the axial impact resistance performance of the DC brushed motor.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a cross-sectional view of a DC brushed motor resistant to axial impact provided by an embodiment of the present application;

[0020] Figure 2 is a longitudinal cross-sectional view of a cylindrical housing in a DC brushed motor resistant to axial impact provided in an embodiment of the present application;

[0021] Figure 3 is a cross-sectional view of a DC brushed motor resistant to axial impact provided by another embodiment of the present application;

[0022] Figure 4 yes Figure 3 A cross-sectional view of the first end cover;

[0023] Figure 5 yes Figure 4 A-direction view;

[0024] Figure 6 yes Figure 1or Figure 3 A cross-sectional view of the commutator assembly;

[0025] Figure 7 yes Figure 6 B view.

[0026] Description of Reference Numerals

[0027] 1-cylindrical casing; 101-first opening; 102-second end cover; 103-second protrusion; 104-second axial hole; 2-first bearing; 3-second bearing; 4-stator assembly; 5-rotor assembly; 501-motor shaft; 502-rotor core; 503-rotor winding; 6-first end cover; 601-first axial hole; 602-first protrusion; 7-buffer gasket; 8-impact-resistant rubber layer; 9-limiting ring; 11-commutator group; 1101-insulating substrate; 1102-pole piece. DETAILED DESCRIPTION

[0028] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0029] In the present disclosure, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the "upper" and "lower" of the corresponding parts in the use state relative to the direction of gravity, and "inside" and "outside" refer to the "inside" and "outside" relative to the corresponding parts' own contours. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements.

[0030] In the related art, the shaft of an ordinary brushed DC motor is usually used to output torque, so the axial impact force of the motor shaft is not considered too much in the design of the brushed DC motor. When an ordinary brushed DC motor is used in a steering gear system with a large axial impact force, the ordinary brushed DC motor cannot withstand the axial impact force and is easily damaged.

[0031] refer to Figures 1 to 7 An embodiment of the present application provides a motor, which may include: a cylindrical casing 1, a first bearing 2, a second bearing 3, a stator assembly 4, a rotor assembly 5, a first bearing stopper, and a second bearing stopper.

[0032] refer to Figure 2 , Figure 4 and Figure 5, wherein the first end of the cylindrical casing 1 has a first opening 101, the first opening 101 is provided with a first end cover 6 for blocking the first opening 101, and the center of the first end cover 6 has a first axial hole 601; Figure 1 and Figure 2 The second end of the cylindrical casing 1 has a second end cover 102 connected to the cylindrical casing 1 , and the second end cover 102 has a second axial hole 104 at its center.

[0033] The first bearing 2 is disposed in the first shaft hole 601. The second bearing 3 is disposed in the second shaft hole 104; the stator assembly 4 is fixedly connected to the inner wall of the cylindrical housing 1. The rotor assembly 5 is rotatably connected to the stator assembly 4, and the rotor assembly 5 includes a motor shaft 501, a rotor core 502 disposed outside the motor shaft 501, and a rotor winding 503 mounted on the rotor core 502. The first end of the motor shaft 501 is interference-fitted with the inner ring of the first bearing 2, and the second end of the motor shaft 501 passes through the first bearing 2 and is interference-fitted with the inner ring of the second bearing 3.

[0034] The first bearing stopper is disposed on the side of the first shaft hole 601 facing the cylindrical casing 1, and is used to prevent the first bearing 2 from moving in a direction close to the cylindrical casing 1. The second bearing stopper is disposed on the side of the second shaft hole 104 facing the cylindrical casing 1, and is used to prevent the second bearing 3 from moving in a direction close to the cylindrical casing 1.

[0035] In the above embodiment, the first end of the motor shaft 501 is installed in the first shaft hole 601 through the first bearing 2, that is, the first end of the motor shaft 501 is interference fit with the inner ring of the first bearing 2, and the outer ring of the first bearing 2 is interference fit with the first shaft hole 601. Since the first bearing limit portion is provided on the side of the first shaft hole 601 facing the cylindrical casing 1, when the motor shaft 501 is subjected to an impact force toward the second end of the motor shaft 501, the first bearing limit portion can prevent the motor shaft 501 from moving toward the second end of the motor shaft 501. Similarly, the second end of the motor shaft 501 is installed in the second shaft hole 104 through the second bearing 3, that is, the second end of the motor shaft 501 is interference fit with the inner ring of the second bearing 3, and the outer ring of the second bearing 3 is interference fit with the second shaft hole 104. Since the second bearing stopper is provided on the side of the second shaft hole 104 facing the cylindrical housing 1, when the motor shaft 501 is subjected to an impact force toward the first end of the motor shaft 501, the second bearing stopper can block the motor shaft 501 from moving toward the first end of the motor shaft 501. In this way, when the motor shaft 501 is subjected to an axial impact force, the first bearing stopper and the second bearing stopper can prevent the axial movement of the motor shaft 501, thereby improving the performance of the DC brush motor in resisting axial impact force.

[0036] In one embodiment of the present application, reference Figure 1 , Figure 4 and Figure 5 The first bearing stopper is a first protrusion 602 extending toward the central axis direction of the first shaft hole 601 at one end of the first shaft hole 601 facing the cylindrical housing 1. In actual production, the first bearing 2 can be first installed in the first shaft hole 601, and then the first protrusion 602 can be arranged at one end of the first shaft hole 601 facing the cylindrical housing 1. Figure 5 , the number of the first protrusions 602 is multiple, and the multiple first protrusions 602 are evenly distributed along the central axis of the first shaft hole 601. The form of the first protrusion 602 is not limited. For example, the first protrusion 602 can be a welding point set at one end of the first shaft hole 601 facing the cylindrical casing 1, or a protrusion formed by using a punch to impact and extrude the material of the inner side surface of the first end cover 6 toward the central axis direction of the first shaft hole 601.

[0037] In another embodiment of the present application, reference Figure 3 , the first bearing limiting part can be a limiting ring 9, the limiting ring 9 has a first through hole at its center, the diameter of the first through hole is larger than the diameter of the motor shaft 501 and smaller than the diameter of the outer ring of the first bearing 2, and the limiting ring 9 is connected to the first end cover 6. For example, the limiting ring 9 can be connected to the inner side of the first end cover 6 by bolts, or can be welded to the inner side of the first end cover 6.

[0038] In one embodiment of the present application, reference Figures 1 to 3 The second bearing stopper is a second protrusion 103 extending from one end of the second shaft hole 104 toward the cylindrical housing 1 toward the central axis direction of the second shaft hole 104. In actual production, the form of the first protrusion 602 of the second protrusion 103 is not limited. Figure 2 , the second protrusion 103 is an annular retaining ring, which is fixedly connected to the inner wall of the second shaft hole 104 and is located at the end of the second shaft hole 104 facing the cylindrical casing 1. The second protrusion 103 can also be in other forms, for example, the second protrusion 103 can be a welding point set at the end of the second shaft hole 104 facing the cylindrical casing 1, or it can be a protruding point formed by using a punch to impact and extrude the material of the inner side surface of the second end cover 102 toward the central axis direction of the first shaft hole 601 at the end of the second shaft hole 104 facing the cylindrical casing 1, and the present disclosure does not limit this.

[0039] In one embodiment of the present application, reference Figure 1 or Figure 3, the first end of the rotor winding 503 protrudes from the first end of the rotor core 502, and the second end of the rotor winding 503 protrudes from the second end of the rotor core 502; the DC brushed motor resistant to axial impact further includes a buffer gasket 7, the buffer gasket 7 has a second through hole for the motor shaft 501 to pass through, the buffer gasket 7 is arranged between the first end of the rotor winding 503 and the first end cover 6, and / or, the buffer gasket 7 is arranged between the second end of the rotor winding 503 and the second end cover 102. In this way, when the motor shaft 501 is subjected to axial impact force, the buffer gasket 7 can absorb the axial impact force, thereby reducing the damage caused by the impact and collision between the rotor winding 503 and the first end cover 6 or the second end cover 102. The buffer gasket 7 is a polyimide glass cloth plate, and the thickness of the polyimide glass cloth plate is 0.1-0.5mm.

[0040] In one embodiment of the present application, reference Figure 1 or Figure 3 The first end of the rotor winding 503 is provided with an impact-resistant adhesive layer 8, and / or the second end of the rotor winding 503 is provided with an impact-resistant adhesive layer 8. The impact-resistant adhesive layer 8 can further protect the rotor winding 503 and absorb the axial impact force from the motor shaft 501. The impact-resistant adhesive layer 8 is DG-2 adhesive, and the thickness of the DG-2 adhesive is 5-5.5 mm.

[0041] In the examples of this application, reference is made to Figure 1 , Figure 6 and Figure 7 The brushed DC motor has a commutator assembly 11, which includes a cylindrical insulating substrate 1101 and a plurality of pole pieces 1102 arranged on the insulating substrate 1101 along a circumferential array of the insulating substrate 1101, wherein the ratio of the length L and the depth H of each pole piece 1102 embedded in the insulating substrate 1101 is ≥5.

[0042] In actual production, the insulating matrix 1101 is usually bakelite powder, and the pole piece 1102 is formed with the insulating matrix 1101 at one time by molding. In ordinary motors, the ratio of the length and depth of the pole piece embedded in the insulating matrix is ​​about 4. In the present application, by increasing the size of the pole piece 1102 along the motor shaft 501, the structural strength of the pole piece 1102 and the insulating matrix 1101 can be greatly improved, thereby improving the axial impact resistance of the DC brush motor.

[0043] In one embodiment of the present application, reference Figure 1 or Figure 3The first shaft hole 601 is a blind hole, and one end of the first shaft hole 601 away from the cylindrical housing 1 is closed. In the steering gear system, the impact force on the first end of the motor shaft 501 is greater than the impact force on the second end of the motor shaft 501. Thus, when the motor shaft 501 is subjected to a greater impact force on the first end of the motor shaft 501, the motor shaft 501 can be pressed against the closed first end cover 6, thereby preventing the DC brush motor from being damaged.

[0044] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0046] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A DC brushed motor resistant to axial impact, characterized in that: include: A cylindrical casing (1), wherein a first end portion of the cylindrical casing (1) has a first opening (101), the first opening (101) is provided with a first end cover (6) for blocking the first opening (101), the first end cover (6) having a first axial hole (601) at its center; a second end portion of the cylindrical casing (1) has a second end cover (102) connected to the cylindrical casing (1), the second end cover (102) having a second axial hole (104) at its center; A first bearing (2) is disposed in the first shaft hole (601); A second bearing (3) is disposed in the second shaft hole (104); A stator assembly (4) fixedly connected to the inner wall of the cylindrical casing (1); A rotor assembly (5) rotatably connected to the stator assembly (4), the rotor assembly (5) comprising a motor shaft (501), a rotor core (502) arranged outside the motor shaft (501), and a rotor winding (503) mounted on the rotor core (502), the first end of the motor shaft (501) being interference fit with the inner ring of the first bearing (2), and the second end of the motor shaft (501) passing through the first bearing (2) and being interference fit with the inner ring of the second bearing (3); A first bearing stopper, arranged on a side of the first shaft hole (601) facing the cylindrical housing (1), and used to prevent the first bearing (2) from moving in a direction close to the cylindrical housing (1); The second bearing stopper is arranged on the side of the second shaft hole (104) facing the cylindrical casing (1) and is used to prevent the second bearing (3) from moving in a direction close to the cylindrical casing (1).

2. The axial impact-resistant DC brushed motor according to claim 1, characterized in that: The first bearing stopper is a first protrusion (602) extending from one end of the first shaft hole (601) toward the cylindrical housing (1) in the direction of the central axis of the first shaft hole (601); There are multiple first protrusions (602), and the multiple first protrusions (602) are evenly distributed circumferentially along the central axis of the first axial hole (601).

3. The axial impact-resistant DC brushed motor according to claim 1, characterized in that: The first bearing limiting portion is a limiting ring (9), the limiting ring (9) has a first through hole at its center for the motor shaft (501) to pass through, the diameter of the first through hole is larger than the diameter of the motor shaft (501) and smaller than the diameter of the outer ring of the first bearing (2), and the limiting ring (9) is connected to the first end cover (6).

4. The axial impact-resistant DC brushed motor according to claim 1, characterized in that: The second bearing limiting portion is a second protrusion (103) extending from one end of the second shaft hole (104) toward the cylindrical casing (1) in the direction of the central axis of the second shaft hole (104).

5. The axial impact-resistant DC brushed motor according to claim 4, characterized in that: The second protrusion (103) is an annular retaining ring, which is fixedly connected to the inner wall of the second axial hole (104) and is located at one end of the second axial hole (104) facing the cylindrical casing (1).

6. The axial impact-resistant DC brushed motor according to claim 1, characterized in that: The first end of the rotor winding (503) protrudes from the first end of the rotor core (502), and the second end of the rotor winding (503) protrudes from the second end of the rotor core (502); The axial impact-resistant DC brushed motor further comprises a buffer gasket (7), wherein the buffer gasket (7) has a second through hole for the motor shaft (501) to pass through, and the buffer gasket (7) is arranged between the first end of the rotor winding (503) and the first end cover (6), and / or the buffer gasket (7) is arranged between the second end of the rotor winding (503) and the second end cover (102).

7. The axial impact-resistant DC brushed motor according to claim 6, characterized in that: The buffer gasket (7) is a polyimide glass cloth plate, and the thickness of the polyimide glass cloth plate is 0.1-0.5 mm.

8. The axial impact-resistant DC brushed motor according to claim 6, characterized in that: The first end of the rotor winding (503) is provided with an impact-resistant adhesive layer (8), and / or the second end of the rotor winding (503) is provided with an impact-resistant adhesive layer (8); the impact-resistant adhesive layer (8) is DG-2 adhesive, and the thickness of the DG-2 adhesive is 5-5.5 mm.

9. The axial impact-resistant DC brushed motor according to claim 1, characterized in that: The brushed DC motor has a commutator assembly (11), the commutator assembly (11) comprising a cylindrical insulating substrate (1101), and a plurality of pole pieces (1102) arranged on the insulating substrate (1101) in an array along the circumference of the insulating substrate (1101), wherein the ratio of the length L and the depth H of each pole piece (1102) embedded in the insulating substrate (1101) is ≥5.

10. The axial impact-resistant DC brushed motor according to claim 1, characterized in that: The first axial hole (601) is a blind hole, and one end of the first axial hole (601) facing away from the cylindrical casing (1) is closed.

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