End cover sealing device of brushless direct current motor

Abstract

The utility model discloses an end cover sealing device of a brushless direct current motor. The device comprises a motor shell and a motor end cover which are sequentially connected, a plurality of fixing assemblies are circumferentially fixed to the peripheral wall of the motor shell at intervals, a fixing block is fixed to the peripheral wall of the upper portion of the motor shell, a butt joint block is fixed to the peripheral wall of the motor end cover, the fixing block and the butt joint block coincide in the axial direction, and a positioning rod is fixedly connected to the bottom face of a connecting block. The lower end of the positioning rod penetrates into the fixing block and penetrates out of a positioning groove formed in the middle of the fixing block, the lower end of the positioning rod is fixedly connected to the motor shell through a connecting piece arranged below the positioning groove, and a first sealing ring used for sealing is arranged at the joint of the connecting piece and the motor shell. The sealing performance between the motor shell and the motor end cover is ensured through the tensioning bolt and the second sealing ring, the whole device is convenient to disassemble, assemble and maintain, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless DC motors, in particular to an end cover sealing device of a brushless DC motor. Background Art

[0002] Brushless DC motors (Brushless DC motors) are booming due to their unique advantages and are widely used in fields such as electric vehicles, aerospace, home appliances, and office automation. Within the automotive industry, the development of electric vehicles is undoubtedly the biggest revolution since the new century, and many countries around the world are eager to seize this opportunity to gain a new foothold. As a core component of electric vehicle drive systems, permanent magnet brushless DC motors (PMBCs) offer advantages such as high power density and high starting torque. They are also compact, have a long lifespan, and possess a simple and robust structure. They are well suited to the frequent starting / braking, acceleration, and hill climbing requirements of electric vehicles, as well as high efficiency and lightweight design. They are one of the most promising motors in the electric vehicle industry. Furthermore, PMBCs can also be used to drive other auxiliary components such as wipers, airbags, power windows, power seats, and power doors.

[0003] Problems with existing technologies: Brushless DC motors often require end cap sealing devices in complex application environments to prevent dust from entering the motor. Existing brushless DC motors often use screw holes in the end caps for sealing, and bolts are used to secure the end caps directly to the motor housing. Rusting the bolts in humid environments can make disassembly and maintenance of the end caps difficult, causing significant trouble for subsequent repairs and maintenance, and affecting work efficiency. Utility Model Content

[0004] To address the problems described in the prior art, the present invention provides a brushless DC motor end cap sealing device. A second, easily assembled sealing ring ensures tightness between the motor end cap and the motor housing. The first sealing ring ensures tightness at the interface between the bolt and the screw hole, resolving the issue of rusting at the bolt due to moisture, which can make disassembly and maintenance difficult.

[0005] The technical solution adopted in this utility model is:

[0006] The utility model includes a motor housing and a motor end cover connected in sequence, and a plurality of groups of fixing components are fixed on the outer peripheral wall of the motor housing at circumferential intervals; the fixing components include a fixing block, a docking block, a positioning rod and a connecting piece, the fixing block is fixed to the outer peripheral wall of the upper part of the motor housing, the docking block is fixed to the outer peripheral wall of the motor end cover, the fixing block and the docking block are arranged to overlap in the axial direction, the bottom surface of the docking block is fixedly connected with the positioning rod, the lower end of the positioning rod penetrates into the fixing block and passes out of the positioning groove opened in the middle of the fixing block, the lower end of the positioning rod is fixedly connected to the motor housing via a connecting piece provided below the positioning groove, and a first sealing ring for sealing is provided at the connection between the connecting piece and the motor housing.

[0007] The connecting member includes a bolt and a tensioning bolt, the tensioning bolt is arranged at the bottom end of the positioning rod, a positioning hole is formed on the lower side end surface of the positioning rod, a threaded hole is formed on the outer peripheral wall of the motor housing and is coaxially arranged with the positioning hole, and the first sealing ring is arranged on the outer peripheral wall of the motor housing and is coaxially arranged with the threaded hole;

[0008] One end of the bolt is sequentially inserted into the positioning hole, the first sealing ring and the threaded hole, and one end of the tensioning bolt passes through the bottom surface of the positioning rod and enters the positioning hole on the lower side end surface of the positioning rod and is tightly connected with the outer peripheral surface of the bolt.

[0009] One end face of the first sealing ring is bonded to the outer peripheral wall of the motor housing, and the other end face is located directly below the positioning groove. The first sealing ring is provided with a toggle block for compressing the first sealing ring so that the positioning rod passes through the positioning groove.

[0010] A plurality of hook assemblies are circumferentially spaced apart on the outer peripheral wall of the middle portion of the motor housing. The hook assembly is composed of a hook, an elastic rope and a protrusion connected in sequence. The protrusion is fixed to the outer wall of the motor housing.

[0011] The bolt and the tensioning bolt are arranged perpendicular to each other.

[0012] An annular groove is formed on the bottom surface of the motor end cover, and a second sealing ring for sealing is bonded in the annular groove.

[0013] The first sealing ring and the second sealing ring are both made of silicone.

[0014] The beneficial effects of the utility model are:

[0015] 1. This device uses the first sealing ring in the extruded state of the fixed assembly to greatly improve the sealing between the bolt and the threaded hole, reducing the possibility of rust on the bolt and the threaded hole. The tightening bolt presses the motor end cover tightly to the motor housing, so that the second sealing ring ensures the sealing between the motor housing and the motor end cover.

[0016] 2. As long as one of the bolts and tensioning bolts is not corroded, the motor end cover can be loosened. Moreover, the bolts and tensioning bolts are partially exposed, and even if they are corroded, they can be easily removed using a nut cutter, making the entire device easy to disassemble and maintain, greatly improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 The utility model is different from Figure 1 Schematic diagram of the structure under viewing angle.

[0019] Figure 3 It is an exploded view of the structure of the utility model.

[0020] Figure 4 for Figure 1 Schematic diagram of the locally enlarged structure at point A in the middle.

[0021] In the figure: 1. Motor housing; 2. Motor end cover; 3. Fixing block; 4. Positioning groove; 5. Docking block; 6. Positioning rod; 7. Positioning hole; 8. Bolt; 9. First sealing ring; 10. Threaded hole; 11. Toggle block; 12. Tensioning bolt; 13. Elastic rope; 14. Hook; 15. Annular groove; 16. Second sealing ring. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 and Figure 2 As shown, the end cover sealing device of the brushless DC motor includes a motor housing 1 and a motor end cover 2 connected in sequence, and a plurality of fixing components are fixed to the outer peripheral walls of the motor housing 1 and the motor end cover 2 at intervals in the circumferential direction.

[0024] The fixing assembly includes a fixing block 3, a docking block 5, a positioning rod 6 and a connecting piece. The fixing block 3 is fixed to the outer peripheral wall of the upper part of the motor housing 1, and the docking block 5 is fixed to the outer peripheral wall of the motor end cover 2. The fixing block 3 and the docking block 5 are arranged to overlap in the axial direction. The bottom surface of the docking block 5 is fixedly connected with the positioning rod 6. The lower end of the positioning rod 6 penetrates into the fixing block 3 and passes out of the positioning groove 4 opened in the middle of the fixing block 3. The lower end of the positioning rod 6 is fixedly connected to the motor housing 1 through a connecting piece provided below the positioning groove 4. A first sealing ring 9 is provided at the connection between the connecting piece and the motor housing 1.

[0025] like Figure 3 and Figure 4As shown, the connecting part includes a bolt 8 and a tensioning bolt 12. The tensioning bolt 12 is arranged at the bottom end of the positioning rod 6. A positioning hole 7 is provided on the lower side end face of the positioning rod 6. The positioning hole 7 is a rectangular hole groove with a diameter slightly larger than the bolt 8, so that the bolt 8 can pass through the positioning hole 7. The outer peripheral wall of the motor housing 1 is provided with a threaded hole 10 coaxially arranged with the positioning hole 7. The first sealing ring 9 is provided on the outer peripheral wall of the motor housing 1 and coaxially arranged with the threaded hole 10. One end face of the first sealing ring 9 is bonded to the outer peripheral wall of the motor housing 1, and the other end face is located directly below the positioning groove 4. The first sealing ring 9 is provided with two toggle blocks 11 for compressing the first sealing ring 9 so that the positioning rod 6 passes through the positioning groove 4. Specifically, the two toggle blocks 11 are respectively connected to the two sides of the annular end face of the first sealing ring 9 to form an integrated structure.

[0026] One end of the bolt 8 is sequentially inserted into the positioning hole 7, the first sealing ring 9 and the threaded hole 10. One end of the tensioning bolt 12 passes through the threaded hole on the bottom surface of the positioning rod 6 and enters the positioning hole 7 on the lower side end surface of the positioning rod 6 and is tightly connected with the outer peripheral surface of the bolt 8. The tensioning bolt 12 pulls the positioning rod 6 downward by squeezing the bolt 8, so that the motor end cover 2 and the motor housing 1 are fixed. The head of the tensioning bolt 12 is provided with a ring, which can be screwed with any rod-shaped tool.

[0027] Specifically, pressing the toggle block 11 causes the first sealing ring 9 to deform, and the positioning rod 6 on the bottom of the docking block 5 is inserted into and out of the positioning groove 4. When the positioning hole 7 at the lower part of the positioning rod 6 and the first sealing ring 9 are at the same height, the end faces of the docking block 5 and the fixing block 3 are tightly attached to each other. At this time, the threaded end of the bolt 8 is inserted into the threaded hole 10 through the positioning hole 7 and the first sealing ring 9 in sequence and threadedly connected with the threaded hole 10, and then the tensioning bolt 12 is tightened. One end of the tensioning bolt 12 passes through the threaded hole on the bottom surface of the positioning rod 6 and enters the positioning hole 7 on the lower side end face of the positioning rod 6 and is pressed and connected with the outer peripheral surface of the bolt 8, so that the motor end cover 2 and the motor housing 1 are fixed. Due to the rubber material of the first sealing ring 9, the first sealing ring 9 is in a compressed state, which greatly increases the sealing between the bolt 8 and the threaded hole 10, making the bolt 8 not easy to corrode and rust, and increasing the convenience during disassembly and maintenance.

[0028] Several hook assemblies are circumferentially spaced apart on the outer peripheral wall in the middle of the motor housing 1. The hook assembly is composed of a hook 14, an elastic rope 13 and a protrusion connected in sequence. The protrusion is fixed to the outer wall of the motor housing 1. The hook assembly facilitates installation.

[0029] An annular groove 15 is provided on the bottom surface of the motor end cover 2, and a second sealing ring 16 for sealing is bonded in the annular groove 15. The materials of the first sealing ring 9 and the second sealing ring 16 are both silicone. Since the first sealing ring 9 and the second sealing ring 16 are fixed by bonding, it is convenient to reassemble them more quickly when damaged.

[0030] Specifically, when the motor end cover 2 is covered on one end of the motor housing 1, the motor end cover 2 compresses the second sealing ring 16 located in the annular groove 15 on its bottom surface, so that the second sealing ring 16 is completely in the annular groove 15, ensuring the sealing of the joint between the motor end cover 2 and the motor housing 1.

Claims

1. An end cover sealing device for a brushless DC motor, characterized in that: The invention comprises a motor housing (1) and a motor end cover (2) connected in sequence, wherein the outer peripheral wall of the motor housing (1) is fixed with a plurality of groups of fixing components at intervals in the circumferential direction; the fixing components comprise a fixing block (3), a docking block (5), a positioning rod (6) and a connecting piece, wherein the fixing block (3) is fixed to the outer peripheral wall of the upper part of the motor housing (1), the docking block (5) is fixed to the outer peripheral wall of the motor end cover (2), the fixing block (3) and the docking block (5) are arranged to overlap in the axial direction, the bottom surface of the docking block (5) is fixedly connected with the positioning rod (6), the lower end of the positioning rod (6) penetrates the fixing block (3) and passes through a positioning groove (4) opened in the middle of the fixing block (3), the lower end of the positioning rod (6) is fixedly connected to the motor housing (1) via a connecting piece provided below the positioning groove (4), and a first sealing ring (9) for sealing is provided at the connection between the connecting piece and the motor housing (1).

2. The end cover sealing device of the brushless DC motor according to claim 1, characterized in that: The connecting member includes a bolt (8) and a tensioning bolt (12), the tensioning bolt (12) is arranged at the bottom end of the positioning rod (6), the lower side end surface of the positioning rod (6) is provided with a positioning hole (7), the outer peripheral wall of the motor housing (1) is provided with a threaded hole (10) coaxially arranged with the positioning hole (7), and the first sealing ring (9) is provided on the outer peripheral wall of the motor housing (1) and coaxially arranged with the threaded hole (10); One end of the bolt (8) is sequentially inserted into the positioning hole (7), the first sealing ring (9) and the threaded hole (10), and one end of the tensioning bolt (12) passes through the bottom surface of the positioning rod (6) and enters the positioning hole (7) on the lower side end surface of the positioning rod (6) and is pressed and connected with the outer peripheral surface of the bolt (8).

3. The end cover sealing device of the brushless DC motor according to claim 1, characterized in that: One end face of the first sealing ring (9) is bonded to the outer peripheral wall of the motor housing (1), and the other end face is located directly below the positioning groove (4). The first sealing ring (9) is provided with a toggle block (11) for compressing the first sealing ring (9) so that the positioning rod (6) passes through the positioning groove (4).

4. The end cover sealing device of the brushless DC motor according to claim 1, characterized in that: A plurality of hook assemblies are provided at circumferential intervals on the outer peripheral wall of the middle portion of the motor housing (1). The hook assemblies are composed of hooks (14), elastic ropes (13) and protrusions connected in sequence. The protrusions are fixed to the outer wall of the motor housing (1).

5. The end cover sealing device of the brushless DC motor according to claim 2, characterized in that: The bolt (8) and the tensioning bolt (12) are arranged perpendicular to each other.

6. The end cover sealing device of the brushless DC motor according to claim 1, characterized in that: An annular groove (15) is formed on the bottom surface of the motor end cover (2), and a second sealing ring (16) for sealing is bonded into the annular groove (15).

7. The end cover sealing device of the brushless DC motor according to claim 6, characterized in that: The materials of the first sealing ring (9) and the second sealing ring (16) are both silicone.

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