A waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake

Abstract

The present invention provides a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake, comprising a first sealing structure installed on the rear side of the permanent magnet DC motor, the first sealing structure being used to seal a carbon brush replacement window on the permanent magnet DC motor; the first sealing structure comprising a sealing ring and a friction pad, the friction pad being fixedly connected to a rear axle seat on the rear side of the permanent magnet DC motor, and the sealing ring being slidably installed on the rear axle seat; a first sealing component being installed on a joint surface between the sealing ring and the rear axle seat, and a second sealing component matching the first sealing component being installed on a joint surface between the sealing ring and the friction pad; the waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake provided by the present invention overcomes the defect that the protection level of existing permanent magnet DC motors and their normally closed electromagnetic brakes is too low.

Description

Technical Field

[0001] The invention relates to the field of permanent magnet DC motors, in particular to a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake. Background Art

[0002] The existing permanent magnet DC motor for traction of electric drive wheels generally has a carbon brush replacement window on its rear axle seat due to the need to replace the brushes. The carbon brush replacement window is usually just a simple shield protection. Due to the need for parking safety, the rear output shaft of the permanent magnet DC motor is provided with a normally closed electromagnetic brake. The normally closed electromagnetic brake is just a simple rubber sheath protection and can only achieve simple dustproof. As a result, the protection level of the permanent magnet DC motor with a normally closed electromagnetic brake can only reach IP31 at most.

[0003] With the advancement of battery technology and the improvement of environmental protection requirements, electric drive technology has been increasingly widely used, and the application environment of electric drive has also shifted from indoors to complex outdoor environments. The protection level of the permanent magnet DC motor and normally closed electromagnetic brake, which are the power output source of the electric drive wheel, restricts its application environment. Changes in the application environment require that the overall protection level of the permanent magnet DC motor with a normally closed electromagnetic brake be increased to IP67 to meet the use requirements. Since the permanent magnet DC motor is a brushed motor that requires regular replacement of carbon brushes, the overall fully enclosed design of the permanent magnet DC motor will cause the motor to be completely disassembled when replacing the carbon brushes, which increases the maintenance cost and maintenance time. Therefore, it is necessary to design a method that can easily replace the carbon brushes of the permanent magnet DC motor while taking into account the protection level. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The problem to be solved by the present invention is to provide a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake, so as to overcome the defect that the protection level of the existing permanent magnet DC motor and its normally closed electromagnetic brake is too low.

[0006] (II) Technical solution

[0007] In order to solve the technical problem, the present invention provides a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake, including a first sealing structure installed on the rear side of the permanent magnet DC motor, the first sealing structure is used to seal the carbon brush replacement window on the permanent magnet DC motor; the first sealing structure includes a sealing ring and a friction pad, the friction pad is fixedly connected to the rear axle seat on the rear side of the permanent magnet DC motor, and the sealing ring is slidably installed on the rear axle seat; a first seal is installed on the joint surface between the sealing ring and the rear axle seat, and a second seal matching the first seal is installed on the joint surface between the sealing ring and the friction pad.

[0008] Furthermore, the waterproof sealing structure also includes a second sealing structure for sealing the electromagnetic brake, and the rear end of the friction pad is connected to the electromagnetic brake; the second sealing structure includes a sealing cover and a third sealing member, the sealing cover is installed in the center hole of the electromagnetic brake, and the third sealing member is installed on the joint surface between the friction pad and the electromagnetic brake. The second sealing structure also includes a fourth sealing member, and the fourth sealing member is installed on the joint surface between the sealing cover and the electromagnetic brake.

[0009] Furthermore, a shaft wire retaining ring is installed on one side of the friction pad close to the sealing ring, and one end of the sealing ring rests on the shaft wire retaining ring; when the shaft wire retaining ring is removed, the sealing ring can slide along the axial direction, thereby opening the carbon brush replacement window to replace the carbon brush.

[0010] Furthermore, the waterproof sealing structure also includes a third sealing structure for sealing the electromagnetic brake, and the friction pad is fixedly connected to the electromagnetic brake by a plurality of screws; the third sealing structure includes a fifth sealing component, and the fifth sealing component is installed on the joint surface between the screw and the electromagnetic brake.

[0011] Furthermore, the waterproof sealing structure also includes a fourth sealing structure for sealing the front end of the permanent magnet DC motor, and the fourth sealing structure includes a sixth sealing component, and the sixth sealing component is installed on the outer circumferential surface of the front end of the permanent magnet DC motor.

[0012] Furthermore, the first seal and the second seal are both O-rings, and the rear axle seat and the friction pad are respectively provided with grooves for placing the O-rings. The third seal and the fourth seal are both O-rings, and the friction pad and the sealing cover are respectively provided with grooves for placing the O-rings. The fifth seal is a metal skeleton combined washer, and the metal skeleton combined washer is sleeved on the screw. The sixth seal is an O-ring, and the front end of the permanent magnet DC motor is provided with a groove for placing the O-ring.

[0013] (III) Beneficial effects

[0014] The waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake provided by the present invention has the following advantages compared with the prior art:

[0015] 1) The waterproof sealing structure of the permanent magnet DC motor with a normally closed electromagnetic brake improves the protection level of the electric drive wheel without making any changes to the existing permanent magnet DC motor or the existing normally closed electromagnetic brake, while taking into account the problem of replacing the carbon brush of the permanent magnet DC motor;

[0016] 2) The waterproof sealing structure of the permanent magnet DC motor with normally closed electromagnetic brake has no impact on the client model. The client model is easy to upgrade, and the working environment is improved from indoor or outdoor non-water wading use to outdoor water wading complex working conditions, which is conducive to the sustainable development of product models. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake according to the present invention;

[0018] Figure 2 It is a schematic structural diagram of a partial waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake according to the present invention;

[0019] Figure 3 It is a structural schematic diagram of a first sealing structure of a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake according to the present invention;

[0020] Figure 4 It is a structural schematic diagram of a second sealing structure and a third sealing structure of a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake according to the present invention;

[0021] Figure 5 It is a structural schematic diagram of a fourth sealing structure of a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake according to the present invention;

[0022] The names of the components corresponding to the various reference numerals in the figure are: 1. permanent magnet DC motor; 2. sealing ring; 3. friction pad; 4. rear axle seat; 5. first seal; 6. second seal; 7. electromagnetic brake; 8. sealing cover; 9. third seal; 10. fourth seal; 11. wire retaining ring for shaft; 12. screw; 13. fifth seal; 14. sixth seal; 15. fastening screw. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] See also Figures 1 to 5The present invention provides a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake, comprising a first sealing structure installed at the rear side of the permanent magnet DC motor 1, the first sealing structure being used to seal the carbon brush replacement window on the permanent magnet DC motor 1; the first sealing structure comprising a sealing collar 2 and a friction pad 3, the friction pad 3 being fixedly connected to the rear axle seat 4 at the rear side of the permanent magnet DC motor 1 by a fastening screw 15, the sealing collar 2 being slidably mounted on the rear axle seat 4; a first sealing member 5 being mounted on the joint surface between the sealing collar 2 and the rear axle seat 4, and a second sealing member 6 cooperating with the first sealing member 5 being mounted on the joint surface between the sealing collar 2 and the friction pad 3. By providing the first sealing structure, sand and water can be prevented from entering the interior of the permanent magnet DC motor from the carbon brush replacement window of the rear axle seat of the permanent magnet DC motor, thereby improving the sealing performance.

[0025] See also Figure 2 and Figure 3 A shaft steel wire retaining ring 11 is installed on the side of the friction pad 3 close to the sealing ring 2, and one end of the sealing ring 2 abuts against the shaft steel wire retaining ring 11; after the shaft steel wire retaining ring 11 is removed, the sealing ring 2 can slide along the axial direction, thereby opening the carbon brush replacement window to replace the carbon brush. Among them, the first seal 5 and the second seal 6 are both O-rings, and grooves for placing O-rings are respectively provided on the rear axle seat 4 and the friction pad 3.

[0026] See also Figure 2 and Figure 4 The waterproof sealing structure also includes a second sealing structure for sealing the electromagnetic brake 7. The rear end of the friction pad 3 is connected to the electromagnetic brake 7. The friction plate and the armature disc of the electromagnetic brake 7 are partially installed in the inner hole of the friction pad 3. The second sealing structure includes a sealing cover 8, a third sealing member 9 and a fourth sealing member 10. The sealing cover 8 is installed in the central hole of the electromagnetic brake 7. The third sealing member 9 is installed on the joint surface between the friction pad 3 and the electromagnetic brake 7. The fourth sealing member 10 is installed on the joint surface between the sealing cover 8 and the electromagnetic brake 7. Among them, the third sealing member 9 and the fourth sealing member 10 are both O-rings, and grooves for placing O-rings are respectively provided on the friction pad 3 and the sealing cover 8. By setting the second sealing structure, sand and water can be prevented from entering the interior of the normally closed electromagnetic brake to affect the life and braking ability of the friction plate and the armature disc of the normally closed electromagnetic brake. At the same time, sand and water can be prevented from passing through the normally closed electromagnetic brake and then entering the interior of the permanent magnet DC motor, thereby improving the sealing performance.

[0027] See also Figure 2 and Figure 4The waterproof sealing structure also includes a third sealing structure for sealing the electromagnetic brake 7. The friction pad 3 is fixedly connected to the electromagnetic brake 7 by a plurality of screws 12. The third sealing structure includes a fifth sealing member 13. The fifth sealing member 13 is installed on the joint surface between the screw 12 and the electromagnetic brake 7. The fifth sealing member 13 is a metal skeleton combined washer, which is sleeved on the screw 12. By setting the third sealing structure, sand and water can be prevented from entering the interior of the normally closed electromagnetic brake through the mounting hole where the screw is connected to the normally closed electromagnetic brake, thereby improving the sealing performance.

[0028] See also Figure 1 and Figure 5 The waterproof sealing structure also includes a fourth sealing structure for sealing the front end of the permanent magnet DC motor 1. The fourth sealing structure includes a sixth sealing member 14. The sixth sealing member 14 is installed on the outer circumferential surface of the front end of the permanent magnet DC motor 1. The sixth sealing member 14 is an O-ring, and a groove for placing the O-ring is provided at the front end of the permanent magnet DC motor 1. By providing the fourth sealing structure, the sixth sealing member 14 can cooperate with the inner hole of the adapter product to form a seal, which can prevent sand and water from entering the permanent magnet DC motor from the front end, thereby improving the sealing performance.

[0029] The present embodiment provides a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake. Since all the joint surfaces between the permanent magnet DC motor and the electromagnetic brake are sealed with a rubber soft sealing material design and the sealing ring can move axially, the protection level of the permanent magnet DC motor and the electromagnetic brake is improved to IP67, and the problem of replacing the motor carbon brushes of the permanent magnet DC motor without disassembling is solved; this structural design greatly improves the life and reliability of the permanent magnet DC motor and the electromagnetic brake, avoids the damage caused by sand and water entering the permanent magnet DC motor and the electromagnetic brake, improves the adaptability of the permanent magnet DC motor and its supporting products in complex environmental conditions, and overcomes the defect that the protection level of the existing permanent magnet DC motor and its normally closed electromagnetic brake is too low.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake, characterized in that: The invention comprises a first sealing structure installed on the rear side of a permanent magnet DC motor (1), the first sealing structure being used to seal a carbon brush replacement window on the permanent magnet DC motor (1); the first sealing structure comprising a sealing ring (2) and a friction pad (3), the friction pad (3) being fixedly connected to a rear axle seat (4) on the rear side of the permanent magnet DC motor (1), and the sealing ring (2) being slidably installed on the rear axle seat (4); a first sealing member (5) being installed on the joint surface between the sealing ring (2) and the rear axle seat (4), and a second sealing member (6) cooperating with the first sealing member (5) being installed on the joint surface between the sealing ring (2) and the friction pad (3); The invention also comprises a second sealing structure for sealing the electromagnetic brake (7), wherein the rear end of the friction pad (3) is connected to the electromagnetic brake (7); the second sealing structure comprises a sealing cover (8) and a third sealing member (9), wherein the sealing cover (8) is installed in the central hole of the electromagnetic brake (7), and the third sealing member (9) is installed on the joint surface between the friction pad (3) and the electromagnetic brake (7); the second sealing structure also comprises a fourth sealing member (10), wherein the fourth sealing member (10) is installed on the joint surface between the sealing cover (8) and the electromagnetic brake (7); A shaft steel wire retaining ring (11) is installed on one side of the friction pad (3) close to the sealing ring (2), and one end of the sealing ring (2) abuts against the shaft steel wire retaining ring (11); when the shaft steel wire retaining ring (11) is removed, the sealing ring (2) can slide along the axial direction, thereby opening the carbon brush replacement window to replace the carbon brush; It also includes a third sealing structure for sealing the electromagnetic brake (7), wherein the friction pad (3) is fixedly connected to the electromagnetic brake (7) via a plurality of screws (12); the third sealing structure includes a fifth sealing member (13), and the fifth sealing member (13) is installed on the joint surface between the screws (12) and the electromagnetic brake (7).

2. The waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake as claimed in claim 1, characterized in that: It also comprises a fourth sealing structure for sealing the front end of the permanent magnet DC motor (1), the fourth sealing structure comprising a sixth sealing member (14), and the sixth sealing member (14) is mounted on the outer circumferential surface of the front end of the permanent magnet DC motor (1).

3. The waterproof sealing structure of the permanent magnet DC motor with electromagnetic brake according to claim 1, characterized in that: The first sealing member (5) and the second sealing member (6) are both O-rings, and grooves for accommodating the O-rings are respectively provided on the rear axle seat (4) and the friction pad (3).

4. The waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake as claimed in claim 1, characterized in that: The third sealing member (9) and the fourth sealing member (10) are both O-rings, and grooves for accommodating the O-rings are respectively provided on the friction pad (3) and the sealing cover (8).

5. The waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake as claimed in claim 1, characterized in that: The fifth sealing member (13) is a metal frame composite gasket, and the metal frame composite gasket is sleeved on the screw (12).

6. The waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake as claimed in claim 2, characterized in that: The sixth sealing member (14) is an O-ring, and a groove for accommodating the O-ring is provided at the front end of the permanent magnet DC motor (1).

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