A motor brush fixing device

Abstract

The patent discloses a motor brush fixing device, which comprises a motor shell, an installation frame is sleeved in the motor shell, through holes are arranged in the left and right side walls of the motor shell and the installation frame, circular grooves are arranged at the left and right ends of the outer side wall of the motor shell, square tubes are attached to the inner left and right side walls of the installation frame, springs are fixedly installed in the square tubes, and the end portions of the springs are fixedly installed with brushes, the end portion of the square tube is installed with a threaded column, the end portion of the threaded column can sequentially penetrate through the installation frame and the motor shell and is fixed with a nut, the end portion of the square tube is inserted into a positioning groove in the installation frame through a positioning column, and the position of the square tube is positioned, the above-mentioned connecting mode can simultaneously assemble the square tube, the installation frame and the motor shell, thereby greatly reducing the assembly time, improving the assembly efficiency, facilitating the assembly of large quantities of motors and improving the practicability.

Description

Technical Field

[0001] This patent relates to the field of brush fixing technology, specifically a motor brush fixing device. Background Technology

[0002] Motor brushes are devices that transmit energy or signals between the stationary and rotating parts of rotating machinery such as motors or generators. They are also known as carbon brushes. Existing brushes are fixed in a square tube by springs, the square tube is fixed in a mounting frame, and the mounting frame is fixed inside the motor housing. When assembling motors in large quantities, the above assembly method will reduce the installation efficiency and make it inconvenient to assemble the motor. Therefore, we propose a motor brush fixing device. Utility Model Content

[0003] The purpose of this patent is to provide a motor brush fixing device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this patent provides the following technical solution: a motor brush fixing device, comprising a motor housing, an installation frame fitted inside the motor housing, through holes provided on the left and right sidewalls of both the motor housing and the installation frame, circular grooves provided at both ends of the outer sidewall of the motor housing, square tubes fitted to the inner left and right sidewalls of the installation frame, a spring fixedly installed inside the square tube, a brush fixedly installed at the end of the spring, the end of the brush tightly fitted to the inner rotating shaft of the motor housing, a threaded post fixedly installed at the outer end of the square tube, a nut screwed through the through hole at the outer end of the threaded post, and the inner side of the nut tightly fitted to the inner sidewall of the circular groove; The mounting frame has positioning grooves on its inner left and right side walls, and the square tube has positioning posts integrally formed on its outer upper and lower sides, with the positioning posts inserted into the positioning grooves.

[0005] Preferably, the sidewall of the threaded post does not contact the inner sidewall of the through hole.

[0006] Preferably, the end of the positioning post is provided with a tapered surface, and the end of the positioning post has a frustum-shaped structure.

[0007] Preferably, the nut includes a nut body and a pressure ring. The nut body is screwed to the end of the threaded post. A first rubber ring is fixedly installed on the outer side of the pressure ring, and a second rubber ring is fixedly installed on the inner side of the pressure ring. The inner side of the nut body is tightly fitted to the first rubber ring, and the inner side of the second rubber ring is tightly fitted to the inner wall of the circular groove.

[0008] Preferably, the threaded column has sliding grooves at both the upper and lower ends of its sidewall, and the pressure ring has sliders integrally formed at both the upper and lower ends of its inner sidewall, with the two sliders slidably installed in the two sliding grooves respectively.

[0009] Preferably, the outer side of the nut body is provided with a cross groove in the middle.

[0010] Compared with the prior art, the beneficial effects of this patent are as follows: This patent installs a threaded post at the end of the square tube. The end of the threaded post can pass through the mounting frame and the motor housing in sequence and be fixed with a nut. The end of the square tube is inserted into the positioning groove in the mounting frame through a positioning post, thereby positioning the position of the square tube. The above connection method allows the square tube, mounting frame and motor housing to be assembled at the same time, thereby greatly reducing the assembly time, improving the assembly efficiency, facilitating the assembly of large batches of motors and improving practicality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall patent.

[0012] Figure 2 This is a partial structural diagram of this patent.

[0013] Figure 3 This is a three-dimensional view of the threaded column of this patent.

[0014] In the diagram: 1. Motor housing, 2. Mounting frame, 3. Circular groove, 4. Square tube, 5. Spring, 6. Brush, 7. Threaded post, 8. Nut, 9. Positioning groove, 10. Positioning post, 11. Conical surface, 12. Nut body, 13. Pressure ring, 14. First rubber ring, 15. Second rubber ring, 16. Slide groove, 17. Slider, 18. Cross groove. Detailed Implementation

[0015] The technical solutions of this patent embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this patent, and not all of them. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0016] Please see Figure 1 , Figure 2 and Figure 3This patent provides a technical solution: a motor brush fixing device, including a motor housing 1, an installation frame 2 is sleeved inside the motor housing 1, through holes are provided on the left and right side walls of the motor housing 1 and the installation frame 2, circular grooves 3 are provided at both ends of the outer side wall of the motor housing 1, square tubes 4 are attached to the inner left and right side walls of the installation frame 2, springs 5 ​​are fixedly installed inside the square tubes 4, brushes 6 are fixedly installed at the ends of the springs 5, the ends of the brushes 6 are tightly attached to the inner rotating shaft of the motor housing 1, threaded columns 7 are fixedly installed at the outer end of the square tubes 4, and nuts 8 are screwed through the through holes at the outer end of the threaded columns 7, and the inner side of the nuts 8 is tightly attached to the inner side wall of the circular grooves 3. The material of spring 5 has been changed from ordinary carbon spring steel to chromium vanadium spring steel (50CrVA), with a tensile strength ≥1275MPa and a yield strength ≥1130MPa, and has better fatigue resistance and high temperature resistance (working temperature can reach 150℃).

[0017] like Figure 1 , 2 As shown, the square tube 4, mounting frame 2 and motor housing 1 can be assembled simultaneously through the threaded post 7 and nut 8.

[0018] The inner left and right side walls of the mounting frame 2 are provided with positioning grooves 9, and the upper and lower sides of the outer end of the square tube 4 are integrally formed with positioning posts 10, which are inserted into the positioning grooves 9.

[0019] By setting the positioning post 10 to be inserted into the positioning groove 9, the installation positions of the square tube 4 and the mounting frame 2 are positioned, and the square tube 4 can also be prevented from rotating around the threaded post 7 as the axis.

[0020] The positioning pin 10 and the positioning groove 9 are interference fit, and the interference is controlled within 0.02-0.05mm.

[0021] Specifically, the sidewall of the threaded column 7 does not contact the inner sidewall of the through hole.

[0022] Specifically, the end of the positioning post 10 is provided with a tapered surface 11, and the end of the positioning post 10 has a frustum-shaped structure.

[0023] The tapered surface 11 reduces the size of the end of the positioning post 10, making it easier for the positioning post 10 to be inserted into the positioning groove 9.

[0024] Specifically, the nut 8 includes a nut body 12 and a pressure ring 13. The nut body 12 is screwed to the end of the threaded post 7. A first rubber ring 14 is fixedly installed on the outer side of the pressure ring 13, and a second rubber ring 15 is fixedly installed on the inner side of the pressure ring 13. The inner side of the nut body 12 is tightly fitted to the first rubber ring 14, and the inner side of the second rubber ring 15 is tightly fitted to the inner wall of the circular groove 3.

[0025] By setting the first rubber ring 14 and the second rubber ring 15, the sealing effect of the through hole in the circular groove 3 can be increased, preventing dust from entering.

[0026] The first rubber ring 14 and the second rubber ring 15 can be made of a composite material of silicone rubber and polytetrafluoroethylene (PTFE). Silicone rubber has good resistance to high and low temperatures (-60℃ - 250℃) and aging resistance, while PTFE has a low coefficient of friction and excellent chemical stability. The hardness of the rubber rings is selected to be Shore A 70-80 degrees, which can ensure good elastic deformation capacity and provide sufficient sealing pressure.

[0027] Specifically, the upper and lower ends of the side wall of the threaded column 7 are provided with sliding grooves 16, and the upper and lower ends of the inner side wall of the pressure ring 13 are integrally formed with sliders 17, and the two sliders 17 are respectively slidably installed in the two sliding grooves 16.

[0028] By setting the slider 17 to slide within the groove 16, the movement trajectory of the pressure ring 13 can be limited, allowing it to move only left and right, ensuring the smooth movement of the two rubber rings. At the same time, the second rubber ring 15 is pressed in a straight line against the inner wall of the circular groove 3, ensuring a sealing effect.

[0029] Specifically, a cross groove 18 is provided in the middle of the outer side of the nut body 12.

[0030] A Phillips screwdriver can be inserted into the Phillips head slot 18 to facilitate rotation of the nut body 12.

[0031] Working principle: When assembling motors in large quantities, the mounting frame 2 is inserted into the motor housing 1, and then the threaded post 7 at the end of the square tube 4 extends through the through hole into the circular groove 3. At the same time, the positioning post 10 is inserted into the positioning groove 9, and then the nut 8 is screwed onto the end of the threaded post 7 and locked. This completes the simultaneous assembly of the square tube 4, the mounting frame 2 and the motor housing 1.

[0032] It should be noted that the device structure and accompanying drawings of this patent mainly describe the principle of this patent. In terms of the technical aspects of this design principle, the setting of the device's power mechanism, power supply system and control system is not fully described. However, those skilled in the art who understand the principle of the above patent can clearly understand the specifics of its power mechanism, power supply system and control system.

[0033] In the description of this patent, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. At the same time, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "fixed installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0034] Although embodiments of this patent have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this patent, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor brush fixing device, characterized in that: The device includes a motor housing (1), an installation frame (2) is fitted inside the motor housing (1), and through holes are provided on the left and right side walls of the motor housing (1) and the installation frame (2). Circular grooves (3) are provided at both ends of the outer side wall of the motor housing (1). Square tubes (4) are attached to the left and right side walls of the inner side walls of the installation frame (2). A spring (5) is fixedly installed inside the square tube (4). A brush (6) is fixedly installed at the end of the spring (5). The end of the brush (6) is tightly attached to the inner shaft of the motor housing (1). A threaded column (7) is fixedly installed at the outer end of the square tube (4). A nut (8) is screwed through the through hole at the outer end of the threaded column (7). The inner side of the nut (8) is tightly attached to the inner side wall of the circular groove (3). The mounting frame (2) has positioning grooves (9) on its inner left and right side walls, and the square tube (4) has positioning posts (10) integrally formed on its outer upper and lower sides. The positioning posts (10) are inserted into the positioning grooves (9).

2. The motor brush fixing device according to claim 1, characterized in that: The sidewall of the threaded column (7) does not contact the inner sidewall of the through hole.

3. The motor brush fixing device according to claim 1, characterized in that: The end of the positioning post (10) is provided with a tapered surface (11), and the end of the positioning post (10) presents a frustum-shaped structure.

4. The motor brush fixing device according to claim 1, characterized in that: The nut (8) includes a nut body (12) and a pressure ring (13). The nut body (12) is screwed to the end of the threaded post (7). A first rubber ring (14) is fixedly installed on the outer side of the pressure ring (13), and a second rubber ring (15) is fixedly installed on the inner side of the pressure ring (13). The inner side of the nut body (12) is tightly attached to the first rubber ring (14), and the inner side of the second rubber ring (15) is tightly attached to the inner wall of the circular groove (3).

5. The motor brush fixing device according to claim 4, characterized in that: The threaded column (7) has a sliding groove (16) at both the upper and lower ends of its sidewall, and the inner sidewall of the pressure ring (13) has a slider (17) integrally formed at both the upper and lower ends of its sidewall. The two sliders (17) are respectively slidably installed in the two sliding grooves (16).

6. The motor brush fixing device according to claim 4, characterized in that: The outer side of the nut body (12) is provided with a cross groove (18).

Images