A light-weight sealed brush DC motor with a reduction gear

Abstract

The application relates to a light-weight sealed brush DC speed reduction motor and relates to the field of speed reduction motors. The brush DC motor is arranged in a cover shell, the brush DC motor is fixedly connected with the cover shell, a gear box is arranged at the head of the cover shell, an input gear shaft is rotatably arranged at the center of the gear box, the lower end of the input gear shaft is connected with the output end of the brush DC motor, an output shaft is rotatably arranged at the eccentric position of the gear box, and a primary transmission shaft and a secondary transmission shaft are further arranged in the gear box. The motor shell and the ring disc plate of the cover shell are integrally formed, the rubber lead tube is arranged, and the sealing structure of the gear box is designed, so that dust, moisture and the like are effectively prevented from entering the motor, the internal components of the motor are protected, and the service life of the motor is prolonged. The gear box adopts a plastic box body, the overall weight of the motor is reduced, the energy consumption is reduced, and the economy and applicability of the motor are improved.

Description

Technical Field

[0001] This application relates to the field of geared motor technology, and in particular to a lightweight, sealed brushed DC geared motor. Background Technology

[0002] As the core of the conveyor drive system, the performance of the drive motor directly affects the overall performance of the equipment. Currently, most drive motors used in conveyors on the market are of the traditional split design. The traditional motor housing and the ring plate that fixes the drive shaft are assembled separately, which easily leads to assembly gaps. The motor leads are sealed only by simple rubber seals, which are prone to aging and failure after long-term use. The gearbox relies on a single sealing gasket, which is easily worn under vibration and temperature changes. These defects allow dust, moisture, and other impurities to easily enter the motor, accelerating bearing wear and clogging gear clearances. Meanwhile, traditional motor gearboxes are often made of cast iron or cast steel to ensure strength, resulting in a large weight. This not only requires more robust brackets for motor installation, increasing manufacturing costs, but also increases the operating load during motor operation, generating greater inertial forces when the conveyor starts, stops, or changes speed, leading to increased motor energy consumption, which does not meet energy-saving requirements, and also reduces the applicability of the motor in mobile equipment or load-bearing-constrained scenarios. Utility Model Content To address the shortcomings of existing geared motors, such as poor sealing and heavy weight, this application provides a lightweight, sealed brushed DC geared motor.

[0003] The lightweight, sealed brushed DC geared motor provided in this application adopts the following technical solution: A lightweight, sealed brushed DC geared motor includes a housing, in which a brushed DC motor is disposed and fixedly connected. A gearbox is mounted at the head of the housing, and an input gear shaft is rotatably mounted at the center of the gearbox. The lower end of the input gear shaft is connected to the output end of the brushed DC motor. An output shaft is rotatably mounted at an eccentric position in the gearbox. A primary drive shaft and a secondary drive shaft are also mounted in the gearbox. The input gear shaft drives the output shaft to rotate synchronously through the primary and secondary drive shafts in sequence. The upper and lower ends of the primary and secondary drive shafts are rotatably connected to the gearbox.

[0004] By adopting the above technical solution, and by installing a brushed DC motor inside the housing and fixing it to the housing, the overall stability of the motor is ensured. The gearbox configuration and the transmission connection method of the input gear shaft, primary drive shaft, secondary drive shaft, and output shaft realize the reduction and transmission of the brushed DC motor's output power, enabling the motor to output power at a suitable speed and torque to meet the needs of corresponding working scenarios. This multi-stage transmission structure can effectively reduce the output shaft speed while increasing the torque, improving the motor's working efficiency and applicability. Furthermore, the housing and gearbox are made of lightweight materials (such as plastic), which can effectively reduce the overall weight and manufacturing cost.

[0005] Optionally, the housing includes a motor housing and an annular plate. The annular plate is installed at the head of the motor housing and is integrally formed with the motor housing. A rubber lead tube is also fixedly installed at the lower end of the motor housing.

[0006] By adopting the above technical solution, the casing features an integrated design of the motor housing and the ring plate, enhancing the overall strength and sealing performance of the casing. The installation of the rubber lead tube not only facilitates motor wiring but also seals and protects the lead wires, preventing dust and moisture from entering the motor through the lead wire holes, further improving the motor's protective performance. Simultaneously, the integrated design reduces gaps between components, lowers assembly difficulty, and improves production efficiency.

[0007] Optionally, the gearbox includes a plastic housing, a housing cover, and a cover that mates with the motor housing. The housing cover is fastened to the upper end face of the plastic housing and is sealed and fixedly connected to the plastic housing. The cover is integrally formed and disposed on the lower end face of the plastic housing.

[0008] By adopting the above technical solution, the gearbox uses a combination structure of a plastic housing, a housing cover, and a machine cover. The plastic housing has the advantage of being lightweight, which can effectively reduce the overall weight of the motor and reduce energy consumption. The housing cover is sealed and fixedly connected to the plastic housing, and the machine cover is integrally molded and set on the lower end face of the plastic housing. This structural design ensures the gearbox's airtightness, prevents oil leakage during gear transmission, and also prevents external dust and moisture from entering the gearbox, affecting the normal transmission of the gears, and extending the service life of the gears.

[0009] Optionally, the inner side of the bottom surface of the plastic housing is provided with a bearing seat for mounting the primary drive shaft, the secondary drive shaft and the output shaft, and the bearing seat is integrally formed with the plastic housing.

[0010] By adopting the above technical solution, the one-piece molded bearing seat on the inner side of the bottom surface of the plastic housing provides precise installation positions for the primary drive shaft, secondary drive shaft, and output shaft, ensuring the installation accuracy and stability of each drive shaft. The one-piece molding design avoids assembly errors between the bearing seat and the plastic housing, reduces vibration and noise during transmission, and improves the smoothness of motor operation. At the same time, the bearing seat facilitates the installation and disassembly of each drive shaft, making motor maintenance and repair easier.

[0011] Optionally, the inner side of the bearing seat is provided with several sets of arc-shaped bosses evenly arranged along the circumferential direction. The arc-shaped bosses are integrally formed with the bearing seat, and an oil-impregnated bearing is also installed in the bearing seat. The oil-impregnated bearing is engaged and fixed with the arc-shaped bosses.

[0012] By adopting the above technical solution, the arc-shaped boss on the inner side of the bearing seat engages and is fixed with the oil-impregnated bearing. On the one hand, the arc-shaped boss can optimize the negative transmission effects caused by the low machining precision of the bearing (approximately circular, not perfectly circular), allowing the oil-impregnated bearing to rotate more stably within the bearing seat, thus improving the stability and reliability of the transmission. On the other hand, the arc-shaped boss and the oil-impregnated bearing have similar coefficients of thermal expansion, avoiding adverse effects caused by excessive differences in the coefficients of thermal expansion between the arc-shaped boss and the plastic parts, such as gap changes and jamming caused by inconsistent thermal expansion, ensuring the normal operation of the motor under different temperature environments.

[0013] Optionally, the input gear shaft includes a main shaft and a drive helical gear. The main shaft is rotatably mounted at the center of the plastic housing, and the drive helical gear is fixedly mounted at the head of the main shaft.

[0014] By adopting the above technical solution, the main shaft of the input gear shaft is rotatably mounted at the center of the plastic housing, ensuring the rotational stability of the input gear shaft. The drive helical gear is fixedly mounted at the head of the main shaft. Through the transmission method of the helical gear, smoother power transmission can be achieved, reducing impact and noise during transmission, and improving the efficiency and quality of power transmission.

[0015] Optionally, the primary drive shaft includes a primary spindle, a mating helical gear, and a top spur gear. The mating helical gear meshes with the driving helical gear, and the top spur gear is disposed on the upper end of the mating helical gear. Both the mating helical gear and the top spur gear are sleeved and fixed on the primary spindle.

[0016] By adopting the above technical solution, the helical gear of the primary drive shaft meshes with the driving helical gear of the input gear shaft, realizing the primary transmission of power. The top spur gear is located above the helical gear, and both the helical gear and the top spur gear are sleeved and fixed on the primary main shaft. This structural design ensures the overall stability and transmission efficiency of the primary drive shaft. Through the combined transmission of helical and spur gears, different transmission requirements can be better adapted to, achieving smooth power conversion and transmission.

[0017] Optionally, the secondary transmission shaft includes a secondary main shaft, a mating spur gear, and a bottom spur gear. The mating spur gear meshes with a top spur gear. The mating spur gear is located above the bottom spur gear, and both the mating spur gear and the bottom spur gear are sleeved and fixed on the secondary main shaft. A driven gear that meshes with the bottom spur gear is sleeved and fixed on the output shaft.

[0018] By adopting the above technical solution, the spur gear of the secondary transmission shaft meshes with the top spur gear of the primary transmission shaft, and the bottom spur gear meshes with the driven gear on the output shaft, realizing two-stage power transmission and final output. This multi-stage transmission structure can adjust the transmission ratio as needed to obtain appropriate speed and torque for the output shaft. At the same time, the precise meshing between the gears ensures the accuracy and stability of the transmission, improving the working performance of the motor.

[0019] In summary, this application includes at least one of the following beneficial technical effects: Through the integrated molding of the motor housing and the ring plate, the installation of rubber lead tubes, and the sealed structure design of the gearbox, this application effectively prevents dust and moisture from entering the motor, protecting the internal components and extending the motor's service life. The gearbox uses a plastic housing, reducing the overall weight of the motor, lowering energy consumption, and improving the motor's economy and applicability. Furthermore, through the integrated molding design of the shaft seat, the cooperation between the arc-shaped boss and the oil-impregnated bearing, and the multi-stage gear transmission structure, the stability and reliability of the motor transmission are ensured, vibration and noise during transmission are reduced, and the motor's working efficiency and quality are improved. Attached Figure Description

[0020] Figure 1 This is a perspective view of the overall structure in the embodiments of this application.

[0021] Figure 2 yes Figure 1 A cross-sectional view of the device shown.

[0022] Figure 3 This is an exploded structural diagram of the housing and gearbox in an embodiment of this application.

[0023] Figure 4 This is a perspective view of the gearbox in the embodiments of this application.

[0024] Figure 5 yes Figure 1 The diagram shows the device without the gearbox installed.

[0025] Figure 6 yes Figure 5 Front view of the device shown.

[0026] Explanation of reference numerals in the attached drawings: 1. Cover; 11. Motor housing; 111. Rubber lead tube; 12. Ring plate; 2. Brushed DC motor; 3. Gearbox; 31. Plastic housing; 311. Shaft seat; 312. Arc-shaped boss; 313. Oil-impregnated bearing; 32. Housing cover; 33. Machine cover; 4. Input gear shaft; 41. Main shaft; 42. Drive helical gear; 5. First-stage transmission shaft; 51. First-stage main shaft; 52. Matching helical gear; 53. Top spur gear; 6. Second-stage transmission shaft; 61. Second-stage main shaft; 62. Matching spur gear; 63. Bottom spur gear; 7. Output shaft; 71. Driven gear. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the accompanying drawings.

[0028] This application discloses a lightweight, sealed brushed DC geared motor.

[0029] Reference Figure 1 , Figure 2 and Figure 3A lightweight, sealed brushed DC geared motor includes a housing 1, within which a brushed DC motor 2 is fixedly connected. A gearbox 3 is mounted at the head of the housing 1, and an input gear shaft 4 is rotatably mounted at the center of the gearbox 3. The lower end of the input gear shaft 4 is connected to the output end of the brushed DC motor 2. An output shaft 7 is rotatably mounted at an eccentric position in the gearbox 3. A primary drive shaft 5 and a secondary drive shaft 6 are also mounted within the gearbox 3. The input gear shaft 4 drives the output shaft 7 to rotate synchronously via the primary drive shaft 5 and the secondary drive shaft 6. Both the upper and lower ends of the primary drive shaft 5 and the secondary drive shaft 6 are rotatably connected to the gearbox 3. By housing the brushed DC motor 2 within the housing 1 and fixing it to the housing 1, the overall stability of the motor is ensured. The gearbox 3 and the transmission connection method of the input gear shaft 4, primary drive shaft 5, secondary drive shaft 6, and output shaft 7 achieve the reduction and transmission of the output power of the brushed DC motor 2, enabling the motor to output power at appropriate speeds and torques to meet the needs of corresponding working scenarios. This multi-stage transmission structure effectively reduces the speed of the output shaft 7 while increasing torque, thus improving the motor's efficiency and applicability. Furthermore, the use of lightweight materials (such as plastic) for the housing 1 and gearbox 3 effectively reduces overall weight and manufacturing costs. The housing 1 includes a motor housing 11 and an annular plate 12. The annular plate 12 is mounted on the head of the motor housing 11 and is integrally formed with it. A rubber lead tube 111 is also fixedly installed at the lower end of the motor housing 11. The integrated design of the motor housing 11 and the annular plate 12 enhances the overall strength and sealing of the housing 1. The installation of the rubber lead tube 111 not only facilitates motor wiring but also seals and protects the leads, preventing dust and moisture from entering the motor through the lead holes, further improving the motor's protective performance. Simultaneously, the integrated design reduces gaps between components, lowers assembly difficulty, and improves production efficiency.

[0030] Reference Figure 3 and Figure 4The gearbox 3 includes a plastic housing 31, a cover 32, and a cover 33 that mates with the motor housing 11. The cover 32 is fastened to the upper surface of the plastic housing 31 and is sealed and fixedly connected to the plastic housing 31. The cover 33 is integrally formed and located on the lower surface of the plastic housing 31. The gearbox 3 adopts a combined structure of the plastic housing 31, cover 32, and cover 33. The plastic housing 31 has the advantage of being lightweight, which can effectively reduce the overall weight of the motor and reduce energy consumption. The cover 32 is sealed and fixedly connected to the plastic housing 31, and the cover 33 is integrally formed and located on the lower surface of the plastic housing 31. This structural design ensures the airtightness of the gearbox 3, prevents oil leakage during gear transmission, and also prevents external dust and moisture from entering the interior of the gearbox 3, affecting the normal transmission of the gears and extending the service life of the gears. The inner bottom surface of the plastic housing 31 is provided with a bearing seat 311 for mounting the primary drive shaft 5, the secondary drive shaft 6, and the output shaft 7. The bearing seat 311 is integrally formed with the plastic housing 31. The integrally formed bearing seat 311 on the inner bottom surface of the plastic housing 31 provides a precise mounting position for the primary drive shaft 5, the secondary drive shaft 6, and the output shaft 7, ensuring the installation accuracy and stability of each drive shaft. The integral design avoids assembly errors between the bearing seat 311 and the plastic housing 31, reduces vibration and noise during transmission, and improves the smoothness of motor operation. At the same time, the bearing seat 311 also facilitates the installation and disassembly of each drive shaft, making it easier for motor maintenance and repair. Several sets of arc-shaped bosses 312 are evenly arranged along the circumferential direction on the inner surface of the bearing seat 311. The arc-shaped bosses 312 are integrally formed with the bearing seat 311, and an oil-impregnated bearing 313 is also installed in the bearing seat 311, which engages and is fixed with the arc-shaped bosses 312. The arc-shaped boss 312 on the inner side of the bearing seat 311 engages and is fixed to the oil-impregnated bearing 313. On the one hand, the arc-shaped boss 312 can alleviate and optimize the negative transmission effects caused by the lower machining precision of the bearing (approximately circular, not perfectly circular), allowing the oil-impregnated bearing 313 to rotate more stably within the bearing seat 311, thus improving the stability and reliability of the transmission. On the other hand, the arc-shaped boss 312 and the oil-impregnated bearing 313 have similar coefficients of thermal expansion, avoiding adverse effects caused by excessive differences in the coefficients of thermal expansion between the two parts, such as gap changes and jamming due to inconsistent thermal expansion, ensuring the normal operation of the motor under different temperature environments.

[0031] Reference Figure 5 and Figure 6The input gear shaft 4 includes a main shaft 41 and a driving helical gear 42. The main shaft 41 is rotatably mounted at the center of the plastic housing 31, and the driving helical gear 42 is fixedly mounted at the head of the main shaft 41. The rotatable mounting of the main shaft 41 at the center of the plastic housing 31 ensures the rotational stability of the input gear shaft 4. The fixed mounting of the driving helical gear 42 at the head of the main shaft 41, through the helical gear transmission method, enables smoother power transmission, reduces impact and noise during transmission, and improves the efficiency and quality of power transmission.

[0032] Reference Figure 5 and Figure 6 The primary drive shaft 5 includes a primary main shaft 51, a mating helical gear 52, and a top spur gear 53. The mating helical gear 52 meshes with a driving helical gear 42, and the top spur gear 53 is positioned above the mating helical gear 52. Both the mating helical gear 52 and the top spur gear 53 are fitted and fixed onto the primary main shaft 51. The mating helical gear 52 of the primary drive shaft 5 meshes with the driving helical gear 42 of the input gear shaft 4, realizing the primary transmission of power. The top spur gear 53 is positioned above the mating helical gear 52, and both the mating helical gear 52 and the top spur gear 53 are fitted and fixed onto the primary main shaft 51. This structural design ensures the overall stability and transmission efficiency of the primary drive shaft 5. Through the combined transmission of helical and spur gears, different transmission requirements can be better adapted to, achieving smooth power conversion and transmission.

[0033] Reference Figure 5 and Figure 6 The secondary transmission shaft 6 includes a secondary main shaft 61, a mating spur gear 62, and a bottom spur gear 63. The mating spur gear 62 meshes with a top spur gear 53 and is positioned above the bottom spur gear 63. Both the mating spur gear 62 and the bottom spur gear 63 are fitted and fixed onto the secondary main shaft 61. A driven gear 71, meshing with the bottom spur gear 63, is fitted and fixed onto the output shaft 7. The mating spur gear 62 of the secondary transmission shaft 6 meshes with the top spur gear 53 of the primary transmission shaft 5, and the bottom spur gear 63 meshes with the driven gear 71 on the output shaft 7, thus realizing the two-stage transmission and final output of power. This multi-stage transmission structure allows for adjustment of the transmission ratio as needed, enabling the output shaft 7 to obtain appropriate speed and torque. Simultaneously, the precise meshing between the gears ensures the accuracy and stability of the transmission, improving the motor's performance.

[0034] The implementation principle of a lightweight, sealed brushed DC geared motor according to an embodiment of this application is as follows: When the power is turned on in actual use, the brushed DC motor 2 starts to run. The motor's output shaft drives the main shaft 41 of the input gear shaft 4 to rotate, which in turn drives the helical gear 42 to rotate. The driving helical gear 42 meshes with the cooperating helical gear 52 of the primary transmission shaft 5, transmitting power to the primary transmission shaft 5, causing the primary main shaft 51 to rotate, and simultaneously the top spur gear 53 also rotates. The top spur gear 53 of the primary transmission shaft 5 meshes with the cooperating spur gear 62 of the secondary transmission shaft 6, transmitting power to the secondary transmission shaft 6, causing the secondary main shaft 61 to rotate, and the bottom spur gear 63 also rotates. The bottom spur gear 63 of the secondary transmission shaft 6 meshes with the driven gear 71 on the output shaft 7, transmitting power to the output shaft 7. The output shaft 7 rotates at a suitable speed and torque, driving the conveyor rollers of the conveying device to rotate, thus realizing the conveying of items.

[0035] Throughout the entire operation, the motor of this invention has good sealing performance, light weight and stable transmission performance, which can ensure the stable operation of the transmission device and reduce maintenance costs and failure rate.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lightweight, sealed brushed DC geared motor, comprising a housing (1), characterized in that: A brushed DC motor (2) is provided in the housing (1). The brushed DC motor (2) is fixedly connected to the housing (1). A gearbox (3) is installed at the head of the housing (1). An input gear shaft (4) is rotatably installed at the center of the gearbox (3). The lower end of the input gear shaft (4) is connected to the output end of the brushed DC motor (2). An output shaft (7) is rotatably installed at an eccentric position in the gearbox (3). A primary drive shaft (5) and a secondary drive shaft (6) are also installed in the gearbox (3). The input gear shaft (4) drives the output shaft (7) to rotate synchronously through the primary drive shaft (5) and the secondary drive shaft (6) in sequence. The upper and lower ends of the primary drive shaft (5) and the secondary drive shaft (6) are rotatably connected to the gearbox (3).

2. The lightweight, sealed brushed DC geared motor according to claim 1, characterized in that: The cover (1) includes a motor housing (11) and an annular plate (12). The annular plate (12) is installed on the head of the motor housing (11) and is integrally formed with the motor housing (11). A rubber lead tube (111) is also fixedly installed at the lower end of the motor housing (11).

3. The lightweight, sealed brushed DC geared motor according to claim 2, characterized in that: The gearbox (3) includes a plastic housing (31), a housing cover (32), and a machine cover (33) that cooperates with the motor housing (11). The housing cover (32) is fastened to the upper end face of the plastic housing (31), and the housing cover (32) and the plastic housing (31) are sealed and fixedly connected. The machine cover (33) is integrally formed and disposed on the lower end face of the plastic housing (31).

4. A lightweight, sealed brushed DC geared motor according to claim 3, characterized in that: The plastic housing (31) has a bearing seat (311) on the inner side of its bottom surface for mounting the primary drive shaft (5), the secondary drive shaft (6) and the output shaft (7). The bearing seat (311) is integrally formed with the plastic housing (31).

5. A lightweight, sealed brushed DC geared motor according to claim 4, characterized in that: The inner side of the bearing seat (311) is provided with a number of arc-shaped bosses (312) evenly arranged along the circumferential direction. The arc-shaped bosses (312) are integrally formed with the bearing seat (311), and an oil-impregnated bearing (313) is also installed in the bearing seat (311). The oil-impregnated bearing (313) is engaged and fixed with the arc-shaped bosses (312).

6. A lightweight, sealed brushed DC geared motor according to claim 5, characterized in that: The input gear shaft (4) includes a main shaft (41) and a driving helical gear (42). The main shaft (41) is rotatably mounted at the center of the plastic housing (31), and the driving helical gear (42) is fixedly mounted at the head of the main shaft (41).

7. A lightweight, sealed brushed DC geared motor according to claim 6, characterized in that: The primary drive shaft (5) includes a primary main shaft (51), a mating helical gear (52), and a top spur gear (53). The mating helical gear (52) meshes with the driving helical gear (42). The top spur gear (53) is located at the upper end of the mating helical gear (52), and both the mating helical gear (52) and the top spur gear (53) are sleeved and fixed on the primary main shaft (51).

8. A lightweight, sealed brushed DC geared motor according to claim 7, characterized in that: The secondary transmission shaft (6) includes a secondary main shaft (61), a mating spur gear (62), and a bottom spur gear (63). The mating spur gear (62) meshes with the top spur gear (53). The mating spur gear (62) is located on the upper end of the bottom spur gear (63). Both the mating spur gear (62) and the bottom spur gear (63) are sleeved and fixed on the secondary main shaft (61). A driven gear (71) meshing with the bottom spur gear (63) is sleeved and fixed on the output shaft (7).

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