Belt wheel speed reducing mechanism

Abstract

The utility model discloses a belt wheel speed reducing mechanism which comprises a motor, a speed reducing shell, a first synchronous wheel, a second synchronous wheel and a synchronous belt, the output end of the motor is coaxially connected with the first synchronous wheel, the synchronous belt is wound on the peripheral wall of the first synchronous wheel and the peripheral wall of the second synchronous wheel, and the second synchronous wheel is provided with an output shaft. The first synchronous wheel, the second synchronous wheel and the synchronous belt are all arranged in the speed reduction shell, the speed reduction shell is provided with a first strip-shaped groove, and the first synchronous wheel is movably matched with the first strip-shaped groove through a first screw. An output shaft of the second synchronizing wheel can penetrate out of the speed reduction shell to be coaxially connected with a steering screw rod or connected with a second-stage speed reduction mechanism, when the tensile force of the synchronous belt needs to be adjusted, the position of the second synchronizing wheel is kept unchanged, the first screw drives the first synchronizing wheel to move along the first strip-shaped groove, and the second synchronizing wheel is driven to move along the second strip-shaped groove. The purpose of adjusting the tension force of the synchronous belt is achieved by adjusting the distance between the first synchronous wheel and the second synchronous wheel.

Description

Technical Field

[0001] This utility model relates to the field of belt tension adjustment technology, specifically to a pulley reduction mechanism. Background Technology

[0002] With the major trends of EVs and intelligent driving, commercial vehicles have a demand for EPS (Electric Power Steering) systems. EPS can solve the persistent problems of large free play, high-speed drift, and poor steering precision inherent in traditional hydraulic power steering systems, and support the expansion of advanced driving functions, such as lane keeping assist (LKA), automatic parking assist (APA), and autonomous driving. To obtain these "additional" functions, an EPS system is essential. While integrating a motor control unit into a recirculating ball mechanical steering gear achieves power assistance, the motor uses a worm gear reduction transmission. Due to sliding meshing, the transmission efficiency is low, requiring grease lubrication. With increased usage frequency, grease loss is severe, leading to rapid wear and significant performance degradation. Furthermore, the use of cyclone milling in the manufacturing process results in high product costs. Belt drives, however, experience belt loosening over long periods, causing pulley slippage and failing to meet the demands of practical use. Utility Model Content

[0003] To address the technical problem of belt slippage, this invention proposes a belt reduction mechanism that adjusts the tension of the synchronous belt by adjusting the distance between the first and second synchronous pulleys.

[0004] The technical solution adopted by this utility model is as follows: A pulley reduction mechanism includes a motor, a reduction housing, a first synchronous pulley, a second synchronous pulley, and a synchronous belt. The output end of the motor is coaxially connected to the first synchronous pulley. The synchronous belt is wound around the outer peripheral wall of the first and second synchronous pulleys. The second synchronous pulley is provided with an output shaft. The first synchronous pulley, the second synchronous pulley, and the synchronous belt are all located inside the reduction housing. The reduction housing is provided with a first strip groove. The first synchronous pulley is movably engaged with the first strip groove by a first screw.

[0005] Optionally, the reduction housing includes an annular plate, a first sealing plate that mates with one side of the annular plate, and a second sealing plate that mates with the other side of the annular plate. The annular plate, the first sealing plate, and the second sealing plate together form a cavity that accommodates the first synchronous pulley, the second synchronous pulley, and the synchronous belt. The motor output end passes through the second sealing plate and is coaxially connected to the first synchronous pulley. The first sealing plate is provided with the first strip groove.

[0006] Optionally, the second sealing plate has multiple first protrusions and a through hole through which the motor output end passes. The multiple first protrusions are arranged circumferentially along the through hole, and the motor has multiple second protrusions circumferentially. The first protrusions and the second protrusions are arranged in a one-to-one correspondence. The first protrusions are provided with a second groove, or the second protrusions are provided with a second groove. The second groove is for the second screw to pass through.

[0007] Optionally, the first screw includes a limiting part, a threaded part, and a smooth part connected in sequence. A first nut is sleeved on the outer peripheral wall of the threaded part. The limiting part and the first nut are respectively located on both sides of the first strip groove. The smooth part is rotatably connected to the first synchronous pulley.

[0008] Optionally, it also includes a bearing, wherein the outer ring of the bearing is fastened to the inner peripheral wall of the first synchronous pulley, and the inner ring of the bearing is fastened to the smooth part.

[0009] Optionally, the bearing is provided at one end of the inner peripheral wall of the first synchronous pulley, and an internal spline is provided at the other end of the inner peripheral wall of the first synchronous pulley. The output end of the motor is provided with an external spline that mates with the internal spline. The smooth part does not contact the output end of the motor.

[0010] Optionally, the shape of the reduction gear housing is matched to the timing belt.

[0011] Optionally, a second nut is also included, wherein the second screw passes through the first protrusion and the second protrusion in sequence and then engages with the second nut.

[0012] The beneficial effects of this utility model are: the output shaft of the second synchronous pulley can pass through the reduction housing and be coaxially connected to the steering screw, or be connected to the secondary reduction mechanism. When it is necessary to adjust the tension of the synchronous belt, the position of the second synchronous pulley remains unchanged, and the first screw drives the first synchronous pulley to move along the first strip groove. The tension of the synchronous belt can be adjusted by adjusting the distance between the first synchronous pulley and the second synchronous pulley. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the pulley reduction mechanism proposed in an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the second strip groove of the pulley reduction mechanism proposed in an embodiment of the present invention.

[0015] The markings in the attached figures are as follows: 1. Motor; 11. Second protrusion; 2. Reduction housing; 21. First groove; 22. Annular plate; 23. First sealing plate; 24. Second sealing plate; 241. First protrusion; 242. Through hole; 243. Second groove; 3. First synchronous pulley; 4. Second synchronous pulley; 5. Synchronous belt; 6. First screw; 61. Limiting part; 62. Threaded part; 7. First nut; 8. Second screw. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 and Figure 2 As shown, this embodiment discloses a pulley reduction mechanism, including a motor 1, a reduction housing 2, a first synchronous pulley 3, a second synchronous pulley 4, and a synchronous belt 5. The output end of the motor 1 is coaxially connected to the first synchronous pulley 3. The synchronous belt 5 is wound around the outer peripheral wall of the first synchronous pulley 3 and the second synchronous pulley 4. The second synchronous pulley 4 has an output shaft. The first synchronous pulley 3, the second synchronous pulley 4, and the synchronous belt 5 are all located inside the reduction housing 2. The reduction housing 2 has a first strip groove 21. The first synchronous pulley 3 is movably engaged with the first strip groove 21 by a first screw 6. The output shaft of the second synchronous pulley 4 can extend out from the reduction housing 2 and be coaxially connected to a steering screw, or connected to a secondary reduction mechanism. When it is necessary to adjust the tension of the synchronous belt 5, the position of the second synchronous pulley 4 remains unchanged, and the first screw 6 drives the first synchronous pulley 3 to move along the first strip groove 21. The tension of the synchronous belt 5 is adjusted by adjusting the distance between the first synchronous pulley 3 and the second synchronous pulley 4.

[0018] In this embodiment, as Figure 1 As shown, the deceleration housing 2 includes an annular plate 22, a first sealing plate 23 that cooperates with one side of the annular plate 22, and a second sealing plate 24 that cooperates with the other side of the annular plate 22. The annular plate 22, the first sealing plate 23, and the second sealing plate 24 together form a cavity that accommodates the first synchronous pulley 3, the second synchronous pulley 4, and the synchronous belt 5. The output end of the motor 1 passes through the second sealing plate 24 and is coaxially connected to the first synchronous pulley 3. The first sealing plate 23 is provided with the first strip groove 21.

[0019] like Figure 2As shown, the second sealing plate 24 has multiple first protrusions 241 and a through hole 242 for the output end of the motor 1. The multiple first protrusions 241 are arranged circumferentially along the through hole 242. The motor 1 has multiple second protrusions 11 circumferentially, with each first protrusion 241 corresponding to the second protrusion 11. Each first protrusion 241 or each second protrusion 11 has a second groove 243, through which a second screw 8 passes. When the first screw 6 drives the first synchronous pulley 3 to move along the first groove 21, the second screw 8 drives the motor 1 to move along the second groove 243, ensuring that the first synchronous pulley 3 and the output end of the motor 1 remain coaxial. A second nut is also included, with the second screw 8 passing through the first protrusion 241 and the second protrusion 11 sequentially before engaging with the second nut. The second screw 8, through its engagement with the second nut, securely connects the motor 1 to the reduction housing 2.

[0020] like Figure 1 As shown, the first screw 6 includes a limiting part 61, a threaded part 62, and a smooth part connected in sequence. A first nut 7 is sleeved on the outer peripheral wall of the threaded part 62. The limiting part 61 and the first nut 7 are respectively located on both sides of the first strip groove 21. The smooth part is rotatably connected to the first synchronous pulley 3. It also includes a bearing. The outer ring of the bearing is fastened to the inner peripheral wall of the first synchronous pulley 3, and the inner ring of the bearing is fastened to the smooth part. The bearing is located at one end of the inner peripheral wall of the first synchronous pulley 3, and an internal spline is located at the other end. The output end of the motor 1 has an external spline that mates with the internal spline. The smooth part and the output end of the motor 1 do not contact each other. When it is necessary to adjust the tension of the timing belt 5, the second screw 8 is removed, the motor 1 is separated from the reduction housing 2, the first screw 6 is loosened, the first timing pulley 3 is moved along the first strip groove 21, and the tension of the first timing belt 5 is adjusted. When it is adjusted to a suitable position, the first nut 7 is tightened through the through hole 242, so that the limiting part 61 of the first screw 6 and the first nut 7 clamp the two sides of the first strip groove 21. Then, the output end of the motor 1 is coaxially assembled with the first timing pulley 3 through the cooperation of the external spline and the internal spline.

[0021] like Figure 1 As shown, the shape of the reduction housing 2 matches the synchronous belt 5. The overall volume of the reduction housing 2 is simplified as much as possible to reduce the area occupied by the pulley reduction mechanism.

[0022] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A pulley reduction mechanism, characterized in that, The device includes a motor, a reduction housing, a first synchronous pulley, a second synchronous pulley, and a synchronous belt. The output end of the motor is coaxially connected to the first synchronous pulley. The synchronous belt is wound around the outer peripheral walls of the first and second synchronous pulleys. The second synchronous pulley is provided with an output shaft. The first synchronous pulley, the second synchronous pulley, and the synchronous belt are all located inside the reduction housing. The reduction housing is provided with a first strip groove. The first synchronous pulley is movably engaged with the first strip groove by a first screw.

2. The pulley reduction mechanism according to claim 1, characterized in that, The deceleration housing includes an annular plate, a first sealing plate that mates with one side of the annular plate, and a second sealing plate that mates with the other side of the annular plate. The annular plate, the first sealing plate, and the second sealing plate together form a cavity that accommodates the first synchronous pulley, the second synchronous pulley, and the synchronous belt. The motor output end passes through the second sealing plate and is coaxially connected to the first synchronous pulley. The first sealing plate is provided with the first strip groove.

3. The pulley reduction mechanism according to claim 2, characterized in that, The second sealing plate has multiple first protrusions and a through hole for the output end of the motor to pass through. The multiple first protrusions are arranged circumferentially along the through hole. The motor has multiple second protrusions circumferentially. The first protrusions and the second protrusions are arranged in a one-to-one correspondence. The first protrusions are provided with a second groove, or the second protrusions are provided with a second groove. The second groove is for the second screw to pass through.

4. The pulley reduction mechanism according to claim 1, characterized in that, The first screw includes a limiting part, a threaded part, and a smooth part connected in sequence. A first nut is sleeved on the outer peripheral wall of the threaded part. The limiting part and the first nut are respectively located on both sides of the first strip groove. The smooth part is rotatably connected to the first synchronous pulley.

5. The pulley reduction mechanism according to claim 4, characterized in that, It also includes a bearing, wherein the outer ring of the bearing is fastened to the inner peripheral wall of the first synchronous pulley, and the inner ring of the bearing is fastened to the smooth part.

6. The pulley reduction mechanism according to claim 5, characterized in that, The bearing is provided at one end of the inner peripheral wall of the first synchronous pulley, and an internal spline is provided at the other end of the inner peripheral wall of the first synchronous pulley. The output end of the motor is provided with an external spline that mates with the internal spline. The smooth part does not contact the output end of the motor.

7. The pulley reduction mechanism according to claim 1, characterized in that, The shape of the speed reduction housing is matched with that of the timing belt.

8. The pulley reduction mechanism according to claim 3, characterized in that, It also includes a second nut, which is engaged with the second screw after passing through the first protrusion and the second protrusion in sequence.

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