Construction hoisting vehicle with reduction motor

Abstract

The application discloses a construction climbing vehicle reduction motor, belonging to the technical field of reduction motors, comprising a motor shell and a main body mechanism, and a reduction mechanism for reducing the motor rotor and a brake mechanism for braking the motor rotor are further arranged in the motor shell. The two-stage reduction mechanism composed of the inner planetary gear set and the outer planetary gear set in series can realize a larger reduction ratio in a compact space, and improve the low-speed large-torque characteristics of the output rotating shaft. The brake mechanism is controlled by the electromagnetic iron to move the brake disc, and the elastic force of the compression spring and the inner spring is switched, so that the outer brake tooth, the right brake tooth, the left brake tooth and the inner brake tooth are in close contact and are clamped and pressed in sequence after the motor is powered off, the multi-surface synchronous braking of the middle brake disc, the inner brake disc and the brake disc is realized, and the operation safety is improved.

Description

Technical Field

[0001] This invention relates to the field of geared motor technology, and in particular to a geared motor for a construction aerial work platform. Background Technology

[0002] In construction, decoration, warehousing, and logistics scenarios, aerial work platforms are essential equipment used to lift workers, tools, or materials to a certain height for operations. The lifting, moving, and platform adjustment of aerial work platforms typically rely on electric motors. Among these, the geared motor, as the core drive component, directly affects the operational safety, stability, and work efficiency of the aerial work platform.

[0003] Currently, the basic structure of geared motors used in construction aerial work platforms typically includes a motor body and a reduction gear mechanism. Motors generate a significant amount of heat during operation; poor heat dissipation can lead to excessive temperature rise, affecting insulation life and output efficiency. In existing technologies, some motors dissipate heat by directly blowing air onto the stator and rotor windings with fan blades, but this method easily introduces external dust and moisture into sensitive internal components, increasing the risk of failure. Other methods use external heat sinks for natural cooling, but their effectiveness is limited under continuous heavy loads or frequent start-stop conditions of the aerial work platform.

[0004] Furthermore, aerial work platforms place high demands on the braking performance of their motors. When the platform reaches a designated height or encounters an emergency, the motor needs to have a fast and reliable braking function to prevent the platform from sliding or slipping, ensuring the safety of personnel and equipment. Some existing geared motors use electromagnetic brakes, but these suffer from problems such as complex structure, slow braking response, large braking impact, or reduced braking force due to brake pad wear after long-term use. Meanwhile, common reduction mechanisms often use single-stage planetary gear reduction, which has limited reduction ratio and torque output capacity, making it difficult to meet the requirements of low-speed, high-torque, and smooth operation of aerial work platforms during heavy-duty lifting.

[0005] Therefore, developing a geared motor for construction aerial work platforms that has good heat dissipation performance, avoids airflow directly eroding internal electrical components, can achieve two-stage speed reduction and torque increase, and has fast and reliable braking function has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention adopts the following technical solution: a geared motor for a construction aerial work platform, comprising a motor housing and a main body mechanism, wherein the main body mechanism comprises a motor rotor, and the motor housing is further provided with a deceleration mechanism for decelerating the motor rotor and a braking mechanism for braking the motor rotor.

[0007] Furthermore, the main body also includes a protective end cover fixedly installed at the end of the motor housing, the protective end cover is provided with multiple air inlets, multiple external heat sinks are provided on the outside of the motor housing, the motor stator is fixedly installed inside the motor housing, the rotor support is fixedly installed inside the motor housing, the motor rotor is rotatably installed in the rotor support through rolling bearings, and the motor rotor rotates inside the motor stator.

[0008] Furthermore, the main body also includes a fan blade disposed inside the motor housing, multiple end air outlets are provided at the end of the motor housing, a heat dissipation duct is disposed inside the motor housing, the heat dissipation duct is connected to the outside through the cover air inlet, and the heat dissipation duct is connected to the outside through the end air outlets.

[0009] After the motor is turned on, the motor stator is energized, which drives the motor rotor to rotate through electromagnetic induction. When the motor is working, the fan blades start, which causes airflow to enter the heat dissipation duct from the air inlet of the cover. Then the airflow is discharged from the end air outlet. The airflow carries away the heat inside the motor. At the same time, the airflow does not flow directly through the motor rotor and motor stator. It also provides auxiliary heat dissipation through the external heat sink.

[0010] Furthermore, the reduction mechanism includes an outer support frame, a middle support frame, and an inner support frame fixedly installed inside the motor housing. An output shaft is rotatably mounted inside the outer support frame via rolling bearings. An outer planetary carrier is fixedly mounted on the output shaft. Multiple outer planetary gears are rotatably mounted on the outer planetary carrier. An outer internal gear ring is fixedly mounted inside the motor housing. An intermediate shaft is rotatably mounted inside the middle support frame via rolling bearings. An outer center gear is fixedly mounted on the intermediate shaft. The outer center gear meshes with the outer planetary gears, and the outer planetary gears mesh with the outer internal gear ring.

[0011] Furthermore, the reduction mechanism also includes an inner planetary carrier fixedly mounted on the intermediate rotating shaft, on which multiple inner planetary gears are rotatably mounted, an inner central gear is fixedly mounted on the motor rotor, and an inner gear ring is fixedly mounted inside the motor housing. The inner gear ring meshes with the inner planetary gears, and the inner planetary gears mesh with the inner central gear. The motor rotor is rotatably mounted inside the inner support frame via rolling bearings.

[0012] When the motor rotor rotates, it drives the inner central gear to rotate, which in turn drives the inner planetary gear to rotate. The inner planetary gear, in meshing with the inner ring gear, drives the inner planetary carrier and the intermediate shaft to rotate at a reduced speed. At this point, a reduction in speed occurs from the rotation of the motor rotor to the rotation of the intermediate shaft. Subsequently, the intermediate shaft drives the outer central gear to rotate, which in turn drives the outer planetary gear to rotate. The outer planetary gear, in meshing with the outer ring gear, drives the outer planetary carrier and the output shaft to rotate at a reduced speed. At this point, a second reduction in speed occurs from the rotation of the intermediate shaft to the rotation of the output shaft, thus achieving a two-stage reduction in speed for the output shaft.

[0013] Furthermore, the braking mechanism includes a brake oil tank fixedly installed inside the motor housing, an outer suction cup slidably installed inside the brake oil tank, the outer suction cup being made of magnetic material, an electromagnet fixedly installed inside the motor housing, a pop-out brake disc fixedly installed on the outer suction cup, and a compression spring provided between the pop-out brake disc and the brake oil tank. When the electromagnet is energized, the electromagnet attracts the outer suction cup, and the compression spring is in a compressed state. When the electromagnet is de-energized, the compression spring rebounds, and the outer suction cup separates from the electromagnet.

[0014] Furthermore, the braking mechanism also includes an inner brake disc fixedly mounted on the motor rotor, a middle brake disc slidably mounted on the inner brake disc, an inner spring between the inner brake disc and the middle brake disc, and a brake oil tank filled with oil.

[0015] Furthermore, the braking mechanism also includes multiple inner brake teeth on the inner brake disc, multiple left brake teeth on the side of the middle brake disc near the inner brake disc, multiple right brake teeth on the side of the middle brake disc near the ejector brake disc, and multiple outer brake teeth on the ejector brake disc. The surfaces of the inner brake teeth, left brake teeth, and right brake teeth are all provided with arc surfaces.

[0016] When the motor is powered on, the electromagnet is energized and attracts the outer suction cup, causing the ejector brake disc and the outer suction cup to move outward. This compresses the spring, causing the ejector brake disc to disengage from the middle brake disc. At this time, the inner spring, which is in a compressed state, rebounds, and the middle brake disc and the right brake tooth still do not contact the ejector brake disc or the outer brake tooth. When the motor rotor rotates, it drives the inner brake disc and the middle brake disc to rotate synchronously.

[0017] When the motor is powered off, the electromagnet loses power and no longer attracts the outer suction cup. The compressed spring rebounds, causing the outer suction cup and the ejector brake disc to move rapidly inward. This brings the outer brake tooth into contact with the middle brake disc, and the right brake tooth into contact with the ejector brake disc. Subsequently, the ejector brake disc, carrying the middle brake disc, moves towards the inner brake disc. The inner spring is compressed, and the inner brake disc comes into contact with the left brake tooth and the middle brake disc. The outer brake tooth presses and locks the right brake tooth and the middle brake disc, while the middle brake disc presses against the inner brake disc, causing the motor rotor and output shaft to brake rapidly.

[0018] The beneficial effects of this invention compared with the prior art are: (1) This invention achieves indirect heat dissipation by setting up fan blades, covering the air inlet, end air outlet and independent heat dissipation duct, and cooperating with the external heat dissipation fins on the outer shell, so that the airflow does not directly blow on the stator and rotor. This can quickly remove the heat inside the motor and prevent the temperature rise from being too high. It can also avoid the direct corrosion of the motor rotor and stator coil by external dust and water vapor, effectively improving the reliability and service life of the motor in harsh construction environments; (2) This invention adopts a two-stage reduction mechanism composed of an internal planetary gear set and an external planetary gear set connected in series. The high speed of the motor rotor first passes through the internal central gear and the internal planetary gear set. The wheel and the inner gear ring reduce speed once, and then the speed is reduced again through the middle shaft to the outer center gear, outer planet gear and outer inner gear ring. This can achieve a large reduction ratio in a compact space, improve the low speed and high torque characteristics of the output shaft, and meet the smooth driving requirements of the construction platform vehicle when lifting under heavy load; (3) The brake mechanism set in this invention uses the electromagnet to control the movement of the pop-out brake disc by switching the power of the compression spring and the inner spring. After the motor is de-energized, the outer brake tooth, right brake tooth, left brake tooth and inner brake tooth can be made to contact each other tightly and press against each other in sequence, so as to realize the multi-face synchronous braking of the middle brake disc, inner brake disc and pop-out brake disc. The mechanical self-locking structure responds quickly and has a large braking force, which can effectively prevent the aerial work platform from accidentally sliding when stopped or in an emergency, thus improving the safety of operation; (4) The inner brake teeth, left brake teeth and right brake teeth of the present invention are all set as arc surfaces, which can reduce stress concentration and friction impact when the brakes are in contact, reduce the wear on the brake disc and brake teeth. At the same time, the brake oil tank is filled with oil, which can lubricate and buffer the internal moving parts, making the braking process more gentle and wear-resistant, extending the maintenance cycle of the brake mechanism and the whole machine, and is suitable for the working conditions of frequent start-stop and intermittent braking of the aerial work platform. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention (internal).

[0021] Figure 3 This is a schematic diagram of the main structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the deceleration mechanism of the present invention. Figure 1 .

[0023] Figure 5 This is a schematic diagram of the deceleration mechanism of the present invention. Figure 2 .

[0024] Figure 6 This is a schematic diagram of the deceleration mechanism of the present invention. Figure 3 .

[0025] Figure 7 This is a schematic diagram of the braking mechanism structure of the present invention. Figure 1 .

[0026] Figure 8 This is a schematic diagram of the braking mechanism structure of the present invention. Figure 2 .

[0027] Figure 9 This is a schematic diagram of the braking mechanism structure of the present invention. Figure 3 .

[0028] Reference numerals: 101-Motor housing; 102-Protective end cover; 103-Fan blade; 104-Rotor bracket; 105-Motor rotor; 106-Motor stator; 107-Air inlet cover; 108-Cooling duct; 109-End outlet; 110-Outer heat sink; 201-Inner gear ring; 202-Outer gear ring; 203-Output shaft; 204-Outer planetary carrier; 205-Outer planetary gear; 206-Outer center gear; 207-Inner planetary carrier; 2 08-Inner planetary gear; 209-Inner center gear; 210-Intermediate shaft; 211-Outer support frame; 212-Middle support frame; 213-Inner support frame; 301-Brake oil tank; 302-Electromagnet; 303-Inner brake disc; 304-Middle brake disc; 305-Pop-up brake disc; 306-Compression spring; 307-Outer suction cup; 308-Inner brake tooth; 309-Left brake tooth; 310-Right brake tooth; 311-Outer brake tooth; 312-Inner spring. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0030] Example: Reference Figures 1-9 A geared motor for a construction aerial work platform includes a motor housing 101 and a main body mechanism. The main body mechanism includes a motor rotor 105. The motor housing 101 is also provided with a speed reduction mechanism for slowing down the motor rotor 105 and a braking mechanism for braking the motor rotor 105.

[0031] like Figure 3 As shown, the main structure also includes a protective end cover 102 fixedly installed at the end of the motor housing 101. The protective end cover 102 is provided with multiple air inlets 107. Multiple external heat sinks 110 are provided on the outside of the motor housing 101. The motor stator 106 is fixedly installed inside the motor housing 101. The rotor support 104 is fixedly installed inside the motor housing 101. The motor rotor 105 is rotatably installed in the rotor support 104 through rolling bearings. The motor rotor 105 rotates inside the motor stator 106.

[0032] like Figure 3As shown, the main structure also includes a fan blade 103 disposed inside the motor housing 101. The motor housing 101 has multiple end air outlet holes 109 at its end. The motor housing 101 has a heat dissipation duct 108 disposed inside the motor housing 101. The heat dissipation duct 108 is connected to the outside through the cover air inlet 107 and the heat dissipation duct 108 is connected to the outside through the end air outlet holes 109.

[0033] After the motor is turned on, the motor stator 106 is energized, which drives the motor rotor 105 to rotate through electromagnetic induction. When the motor is working, the fan blades 103 start, so that the airflow enters the heat dissipation duct 108 from the air inlet 107 on the cover. Then the airflow is discharged from the end air outlet 109. The airflow carries away the heat inside the motor. At the same time, the airflow does not flow directly through the motor rotor 105 and the motor stator 106. The external heat sink 110 provides auxiliary heat dissipation.

[0034] like Figures 4-6 As shown, the reduction mechanism includes an outer support frame 211, a middle support frame 212, and an inner support frame 213 fixedly installed inside the motor housing 101. An output shaft 203 is rotatably installed inside the outer support frame 211 via rolling bearings. An outer planetary carrier 204 is fixedly installed on the output shaft 203. Multiple outer planetary gears 205 are rotatably installed on the outer planetary carrier 204. An outer internal gear ring 202 is fixedly installed inside the motor housing 101. An intermediate shaft 210 is rotatably installed inside the middle support frame 212 via rolling bearings. An outer center gear 206 is fixedly installed on the intermediate shaft 210. The outer center gear 206 meshes with the outer planetary gears 205, and the outer planetary gears 205 mesh with the outer internal gear ring 202.

[0035] like Figures 4-6 As shown, the reduction mechanism also includes an inner planetary carrier 207 fixedly mounted on the intermediate rotating shaft 210. Multiple inner planetary gears 208 are rotatably mounted on the inner planetary carrier 207. An inner central gear 209 is fixedly mounted on the motor rotor 105. An inner gear ring 201 is fixedly mounted inside the motor housing 101. The inner gear ring 201 meshes with the inner planetary gears 208. The inner planetary gears 208 mesh with the inner central gear 209. The motor rotor 105 is rotatably mounted in the inner support frame 213 through rolling bearings.

[0036] When the motor rotor 105 rotates, it drives the inner central gear 209 to rotate, which in turn drives the inner planetary gear 208 to rotate. Under the meshing action of the inner internal gear ring 201, the inner planetary carrier 207 and the intermediate shaft 210 are driven to rotate at a reduced speed. At this time, the rotation of the motor rotor 105 to the rotation of the intermediate shaft 210 has undergone a first reduction. Subsequently, the intermediate shaft 210 drives the outer central gear 206 to rotate, which in turn drives the outer planetary gear 205 to rotate. Under the meshing action of the outer internal gear ring 202, the outer planetary carrier 204 and the output shaft 203 are driven to rotate at a reduced speed. At this time, the rotation of the intermediate shaft 210 to the rotation of the output shaft 203 has undergone a second reduction, thus realizing the second-stage reduction of the output shaft 203.

[0037] like Figures 7-9 As shown, the braking mechanism includes a brake oil tank 301 fixedly installed inside the motor housing 101. An outer suction cup 307 is slidably installed inside the brake oil tank 301. The outer suction cup 307 is made of magnetic material. An electromagnet 302 is fixedly installed inside the motor housing 101. A pop-out brake disc 305 is fixedly installed on the outer suction cup 307. A compression spring 306 is provided between the pop-out brake disc 305 and the brake oil tank 301. When the electromagnet 302 is energized, the electromagnet 302 attracts the outer suction cup 307, and the compression spring 306 is in a compressed state. When the electromagnet 302 is de-energized, the compression spring 306 rebounds, and the outer suction cup 307 separates from the electromagnet 302.

[0038] like Figures 7-9 As shown, the braking mechanism also includes an inner brake disc 303 fixedly mounted on the motor rotor 105, a middle brake disc 304 slidably mounted on the inner brake disc 303, an inner spring 312 between the inner brake disc 303 and the middle brake disc 304, and a brake oil tank 301 filled with oil.

[0039] like Figures 7-9 As shown, the braking mechanism also includes multiple inner brake teeth 308 disposed on the inner brake disc 303, multiple left brake teeth 309 disposed on the side of the middle brake disc 304 near the inner brake disc 303, multiple right brake teeth 310 disposed on the side of the middle brake disc 304 near the ejector brake disc 305, and multiple outer brake teeth 311 disposed on the ejector brake disc 305. The inner brake teeth 308, left brake teeth 309 and right brake teeth 310 are all provided with arc surfaces.

[0040] When the motor is powered on, the electromagnet 302 is energized and attracts the outer suction cup 307, causing the ejector brake disc 305 and the outer suction cup 307 to move outward, which compresses the compression spring 306, causing the ejector brake disc 305 to disengage from the middle brake disc 304. At this time, the inner spring 312, which is in a compressed state, rebounds, and the middle brake disc 304 and the right brake tooth 310 still do not contact the ejector brake disc 305 or the outer brake tooth 311. When the motor rotor 105 rotates, it drives the inner brake disc 303 and the middle brake disc 304 to rotate synchronously.

[0041] Working principle: After the motor is turned on, the motor stator 106 is energized, which drives the motor rotor 105 to rotate through electromagnetic induction. When the motor is working, the fan blades 103 start, so that the airflow enters the heat dissipation duct 108 from the air inlet 107 on the cover. Then the airflow is discharged from the end air outlet 109. The airflow carries away the heat inside the motor. At the same time, the airflow does not flow directly through the motor rotor 105 and the motor stator 106. The external heat sink 110 provides auxiliary heat dissipation. When the motor is powered on, the electromagnet 302 is energized and attracts the outer suction cup 307, causing the ejector brake disc 305 and the outer suction cup 307 to move outward, which compresses the compression spring 306, causing the ejector brake disc 305 to disengage from the middle brake disc 304. At this time, the inner spring 312, which is in a compressed state, rebounds, and the middle brake disc 304 and the right brake tooth 310 still do not contact the ejector brake disc 305 or the outer brake tooth 311. When the motor rotor 105 rotates, it drives the inner brake disc 303 and the middle brake disc 304 to rotate synchronously. When the motor rotor 105 rotates, it drives the inner central gear 209 to rotate, which in turn drives the inner planetary gear 208 to rotate. Under the meshing action of the inner internal gear ring 201, the inner planetary carrier 207 and the intermediate shaft 210 are driven to rotate at a reduced speed. At this time, the rotation of the motor rotor 105 to the rotation of the intermediate shaft 210 has undergone a first reduction. Subsequently, the intermediate shaft 210 drives the outer central gear 206 to rotate, which in turn drives the outer planetary gear 205 to rotate. Under the meshing action of the outer internal gear ring 202, the outer planetary carrier 204 and the output shaft 203 are driven to rotate at a reduced speed. At this time, the rotation of the intermediate shaft 210 to the rotation of the output shaft 203 has undergone a second reduction, thus realizing the second-stage reduction of the output shaft 203.

[0042] When the motor is powered off, the electromagnet 302 loses power and no longer attracts the outer suction cup 307. The compression spring 306 rebounds, causing the outer suction cup 307 and the ejector brake disc 305 to move rapidly inward. This causes the outer brake tooth 311 to contact the middle brake disc 304, and the right brake tooth 310 to contact the ejector brake disc 305. Subsequently, the ejector brake disc 305 moves the middle brake disc 304 toward the inner brake disc 303. The inner spring 312 is compressed, and the inner brake disc 303 contacts the left brake tooth 309 and the inner brake tooth 308 contacts the middle brake disc 304. The outer brake tooth 311 squeezes and locks the right brake tooth 310 and the middle brake disc 304, while the middle brake disc 304 squeezes the inner brake disc 303, causing the motor rotor 105 and the output shaft 203 to brake rapidly.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the present invention based on the technical solution and inventive concept of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A geared motor for a construction aerial work platform, comprising a motor housing (101) and a main body structure, characterized in that: The main structure includes a motor rotor (105), and the motor housing (101) is also provided with a deceleration mechanism for decelerating the motor rotor (105) and a braking mechanism for braking the motor rotor (105).

2. The geared motor for a construction aerial work platform according to claim 1, characterized in that: The main structure also includes a protective end cover (102) fixedly installed at the end of the motor housing (101). The protective end cover (102) is provided with multiple air inlets (107). Multiple external heat sinks (110) are provided on the outside of the motor housing (101). The motor stator (106) is fixedly installed inside the motor housing (101). The rotor bracket (104) is fixedly installed inside the motor housing (101). The motor rotor (105) is rotatably installed in the rotor bracket (104) through rolling bearings. The motor rotor (105) rotates inside the motor stator (106).

3. The geared motor for a construction aerial work platform according to claim 2, characterized in that: The main structure also includes a fan blade (103) installed inside the motor housing (101). The motor housing (101) has multiple end air outlets (109) at its end. The motor housing (101) has a heat dissipation duct (108) installed inside its interior. The heat dissipation duct (108) is connected to the outside through the cover air inlet (107) and the heat dissipation duct (108) is connected to the outside through the end air outlets (109).

4. The geared motor for a construction aerial work platform according to claim 1, characterized in that: The reduction mechanism includes an outer support frame (211), a middle support frame (212), and an inner support frame (213) fixedly installed inside the motor housing (101). An output shaft (203) is rotatably installed inside the outer support frame (211) via rolling bearings. An outer planetary carrier (204) is fixedly installed on the output shaft (203). Multiple outer planetary gears (205) are rotatably installed on the outer planetary carrier (204). An outer internal gear ring (202) is fixedly installed inside the motor housing (101). An intermediate shaft (210) is rotatably installed inside the middle support frame (212) via rolling bearings. An outer center gear (206) is fixedly installed on the intermediate shaft (210). The outer center gear (206) meshes with the outer planetary gears (205), and the outer planetary gears (205) mesh with the outer internal gear ring (202).

5. A geared motor for a construction aerial work platform according to claim 4, characterized in that: The deceleration mechanism also includes an inner planetary carrier (207) fixedly mounted on an intermediate rotating shaft (210), a plurality of inner planetary gears (208) rotatably mounted on the inner planetary carrier (207), an inner central gear (209) fixedly mounted on the motor rotor (105), an inner gear ring (201) fixedly mounted inside the motor housing (101), the inner gear ring (201) meshing with the inner planetary gears (208), the inner planetary gears (208) meshing with the inner central gear (209), and the motor rotor (105) rotatably mounted inside the inner support frame (213) via rolling bearings.

6. A geared motor for a construction aerial work platform according to claim 1, characterized in that: The braking mechanism includes a brake oil tank (301) fixedly installed inside the motor housing (101). An outer suction cup (307) is slidably installed inside the brake oil tank (301). The outer suction cup (307) is made of magnetic material. An electromagnet (302) is fixedly installed inside the motor housing (101). A pop-out brake disc (305) is fixedly installed on the outer suction cup (307). A compression spring (306) is provided between the pop-out brake disc (305) and the brake oil tank (301). When the electromagnet (302) is energized, the electromagnet (302) attracts the outer suction cup (307), and the compression spring (306) is in a compressed state. When the electromagnet (302) is de-energized, the compression spring (306) rebounds, and the outer suction cup (307) separates from the electromagnet (302).

7. A geared motor for a construction aerial work platform according to claim 6, characterized in that: The braking mechanism also includes an inner brake disc (303) fixedly mounted on the motor rotor (105), a middle brake disc (304) slidably mounted on the inner brake disc (303), an inner spring (312) between the inner brake disc (303) and the middle brake disc (304), and the brake oil tank (301) is filled with oil.

8. A geared motor for a construction aerial work platform according to claim 7, characterized in that: The braking mechanism also includes multiple inner brake teeth (308) on the inner brake disc (303), multiple left brake teeth (309) on the side of the middle brake disc (304) near the inner brake disc (303), multiple right brake teeth (310) on the side of the middle brake disc (304) near the ejector brake disc (305), and multiple outer brake teeth (311) on the ejector brake disc (305). The inner brake teeth (308), left brake teeth (309) and right brake teeth (310) are all provided with arc surfaces.

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