Two-stage deceleration belt wheel steering gear

Abstract

A first transmission wheel is coaxially connected with the output end of a motor, a first synchronous belt is wound around the peripheral walls of the first transmission wheel and a first belt wheel, the first belt wheel is coaxially connected with a second transmission wheel, and a second synchronous belt is wound around the peripheral walls of the second transmission wheel and a second belt wheel. And the second belt wheel is coaxially connected with the steering screw rod. During use, a motor drives a first belt wheel to rotate synchronously through a first transmission wheel and a first synchronous belt, and the first belt wheel drives a second belt wheel to rotate synchronously through a second transmission wheel and a second synchronous belt, so that the second belt wheel drives a steering screw rod to rotate; two-stage belt wheel transmission formed by the first transmission wheel and the first belt wheel and two-stage belt wheel transmission formed by the second transmission wheel and the second belt wheel have a larger transmission speed ratio and higher transmission efficiency, and compared with worm and gear transmission, a motor of a belt wheel speed reducer and a steering screw are arranged in parallel, so that the split space of the steering gear is reduced, and interference with other parts during assembly is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile, concretely relates to two stage reduction pulley steering gear. BACKGROUND

[0002] At present, the electric power steering system used on various vehicles is mostly realized by installing a worm gear reducer on a steering column, with the development of the times and the progress of technology, the worm gear reducer transmission mechanism gradually exposes the following problems: small transmission ratio, low transmission efficiency, and when installing the power motor, the output shaft of the power motor needs to be perpendicular to the steering column and installed on the side of the steering column, which occupies a larger space in the cab, because the space of the vehicle cab is compact, therefore, the existing worm gear type electric steering column often interferes with other parts during assembly, increasing the labor intensity of the operator. SUMMARY

[0003] In view of the technical problems of small transmission ratio and low transmission efficiency of the existing worm gear transmission mechanism, the utility model provides a two stage reduction pulley steering gear, the two stage pulley transmission formed by the first transmission wheel and the first pulley and the second transmission wheel and the second pulley has a larger transmission ratio and higher transmission efficiency, and interference with other parts during assembly is avoided.

[0004] The technical scheme adopted by the utility model is as follows: a two stage reduction pulley steering gear, comprising a motor, a first transmission wheel, a second transmission wheel, a first pulley, a second pulley, a first synchronous belt, a second synchronous belt and a steering screw, the first transmission wheel is coaxially connected with the output end of the motor, the first synchronous belt is wound on the outer peripheral wall of the first transmission wheel and the first pulley, the first pulley is coaxially connected with the second transmission wheel, the second synchronous belt is wound on the outer peripheral wall of the second transmission wheel and the second pulley, and the second pulley is coaxially connected with the steering screw.

[0005] Optionally, it also comprises a shell with a cavity, the shell is provided with a partition plate, the partition plate divides the cavity into a first chamber and a second chamber, the first transmission wheel, the first pulley and the first synchronous belt are located in the first chamber, the second transmission wheel, the second pulley and the second synchronous belt are located in the second chamber, the output end of the motor enters the first chamber and is coaxially connected with the first transmission wheel, and the steering screw passes through the partition plate and enters the second chamber and is coaxially connected with the second pulley.

[0006] Optionally, a transmission rod is arranged between the second transmission wheel and the first pulley, one end of the transmission rod is fixedly connected with the second transmission wheel, the other end of the transmission rod is fixedly connected with the first pulley, and the transmission rod is rotatably connected with the partition plate.

[0007] Optionally, the partition plate is provided with a through hole for the transmission rod to pass through, a bearing is mounted in the through hole, and the inner ring of the bearing is sleeved on the outer circumferential wall of the transmission rod, and the outer ring of the bearing abuts against the inner circumferential wall of the through hole.

[0008] Optionally, the inner circumferential wall of the second transmission wheel and the inner circumferential wall of the first belt wheel are respectively provided with grooves, and the two ends of the transmission rod are respectively provided with protrusions matched with the grooves.

[0009] Optionally, the shell comprises a first protective shell and a second protective shell, the first protective shell and the second protective shell are respectively located on the two sides of the partition plate, the first protective shell surrounds the first cavity, and the second protective shell surrounds the second cavity.

[0010] Optionally, the first protective shell is matched with the first synchronous belt in shape, and the second protective shell is matched with the second synchronous belt in shape.

[0011] Optionally, the first protective shell is provided with a first sealing plate on the side away from the partition plate, the second protective shell is provided with a second sealing plate on the side away from the partition plate, and the output end of the motor is coaxially connected with the first transmission wheel through the first sealing plate.

[0012] The utility model discloses a beneficial effect is: when using, the motor is driven synchronous rotation through the first transmission wheel and the first synchronous belt, and the first synchronous belt is driven synchronous rotation through the second transmission wheel and the second synchronous belt, and the second synchronous belt drives the steering screw rod to rotate, and the two-stage belt wheel transmission formed by the first transmission wheel and the first synchronous belt, the second transmission wheel and the second synchronous belt has greater transmission ratio, and the transmission efficiency is higher, and compared with the worm and the worm gear transmission, the motor of the belt speed reducer and the steering screw rod are parallelly arranged, the space of the steering device is reduced, and the interference with other components during assembly is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 The structure diagram of the two-stage speed reduction belt wheel steering device is provided for the utility model embodiment.

[0014] Fig. 2 The structure diagram of the two-stage speed reduction belt wheel steering device is provided for the utility model embodiment.

[0015] Fig. 3 The structure diagram of the two-stage speed reduction belt wheel steering device is provided for the utility model embodiment.

[0016] The labels in the attached figures are as follows: 1. Motor; 2. First transmission wheel; 3. Second transmission wheel; 4. First pulley; 5. Second pulley; 6. First synchronous belt; 7. Second synchronous belt; 8. Steering screw; 9. Housing; 10. Partition plate; 11. Transmission rod; 12. Bearing; 13. Groove; 14. Protrusion; 15. First protective shell; 16. Second protective shell; 17. First sealing plate; 18. Second sealing plate. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0018] like Figs. 1 to 3 As shown, this embodiment discloses a two-stage reduction belt pulley steering gear, including a motor 1, a first transmission wheel 2, a second transmission wheel 3, a first pulley 4, a second pulley 5, a first synchronous belt 6, a second synchronous belt 7, and a steering screw 8. The first transmission wheel 2 is coaxially connected to the output end of the motor 1. The first synchronous belt 6 is wound around the outer peripheral wall of the first transmission wheel 2 and the first pulley 4. The first pulley 4 is coaxially connected to the second transmission wheel 3. The second synchronous belt 7 is wound around the outer peripheral wall of the second transmission wheel 3 and the second pulley 5. The second pulley 5 is coaxially connected to the steering screw 8. In use, motor 1 drives first pulley 4 to rotate synchronously through first transmission wheel 2 and first synchronous belt 6. First pulley 4 drives second pulley 5 to rotate synchronously through second transmission wheel 3 and second synchronous belt 7, causing second pulley 5 to drive steering screw 8 to rotate. The two-stage pulley transmission formed by first transmission wheel 2 and first pulley 4, and second transmission wheel 3 and second pulley 5 has a larger speed ratio and higher transmission efficiency. Compared with worm gear transmission, the motor 1 of the pulley reducer is arranged parallel to steering screw 8, which reduces the space of the steering gear and avoids interference with other parts during assembly.

[0019] In this embodiment, as Fig. 2 As shown, the device also includes a housing 9 with a cavity. The housing 9 has a partition 10 that divides the cavity into a first chamber and a second chamber. The first drive wheel 2, the first pulley 4, and the first synchronous belt 6 are located inside the first chamber. The second drive wheel 3, the second pulley 5, and the second synchronous belt 7 are located inside the second chamber. The output end of the motor 1 enters the first chamber and is coaxially connected to the first drive wheel 2. The steering screw 8 passes through the partition 10 and enters the second chamber, coaxially connecting to the second pulley 5. The output end of the motor 1 is interference-fitted with the first drive wheel 2, and the second pulley 5 is interference-fitted with the steering screw 8.

[0020] like Fig. 2As shown, the second transmission wheel 3 and the first pulley 4 are provided with a transmission rod 11, one end of the transmission rod 11 is fixedly matched with the second transmission wheel 3, the other end of the transmission rod 11 is fixedly matched with the first pulley 4, and the transmission rod 11 is rotationally matched with the partition plate 10. The partition plate 10 is provided with a through hole for the transmission rod 11 to pass through, a bearing 12 is mounted in the through hole, the inner ring of the bearing 12 is sleeved on the outer circumferential wall of the transmission rod 11, and the outer ring of the bearing 12 abuts against the inner circumferential wall of the through hole. The bearing 12 supports the transmission rod 11. The inner circumferential wall of the second transmission wheel 3 and the inner circumferential wall of the first pulley 4 are respectively provided with grooves 13, and the two ends of the transmission rod 11 are respectively provided with protrusions 14 matched with the grooves 13. The transmission rod 11 is matched with the grooves 13 and the protrusions 14, so that the first pulley 4 drives the second transmission wheel 3 to rotate through the transmission rod 11.

[0021] In this embodiment, as shown in the figure, Fig. 2 As shown, the shell 9 includes a first protective shell 15 and a second protective shell 16, the first protective shell 15 and the second protective shell 16 are respectively located on both sides of the partition plate 10, the first protective shell 15 surrounds the first chamber, and the second protective shell 16 surrounds the second chamber. The shape of the first protective shell 15 matches the first synchronous belt 6, and the shape of the second protective shell 16 matches the second synchronous belt 7. The overall volume of the shell 9 is simplified as much as possible, and the occupied area of the steering gear is reduced.

[0022] In this embodiment, as shown in the figure, Fig. 3 As shown, the first protective shell is provided with a first sealing plate 17 on the side away from the partition plate 10, the second protective shell is provided with a second sealing plate 18 on the side away from the partition plate 10, and the output end of the motor 1 is coaxially connected with the first transmission wheel 2 through the first sealing plate 17.

[0023] It can be understood that the above-described specific embodiments are only used to explain the related utility model, and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for convenience of description. The multiple technical solutions in the same embodiment and the multiple technical solutions in different embodiments can be arranged and combined to form new technical solutions without contradiction or conflict. Any equivalent structural transformation, direct or indirect application in other related technical fields, and the like are also included in the protection scope of the utility model.

Claims

1. A two-stage reduction belt pulley turner characterized by, The motor, the first transmission wheel, the second transmission wheel, the first belt wheel, the second belt wheel, the first synchronous belt, the second synchronous belt and the steering screw, the first transmission wheel is coaxial with the output end of the motor, the first synchronous belt is arranged on the outer peripheral wall of the first transmission wheel and the first belt wheel, the first belt wheel is coaxial with the second transmission wheel, the second synchronous belt is arranged on the outer peripheral wall of the second transmission wheel and the second belt wheel, and the second belt wheel is coaxial with the steering screw.

2. The two-stage reduction belt-pulley steering gear of claim 1, wherein, The housing with a cavity is further provided with a partition plate, the partition plate separates the cavity into a first chamber and a second chamber, the first transmission wheel, the first belt wheel and the first synchronous belt are located in the first chamber, the second transmission wheel, the second belt wheel and the second synchronous belt are located in the second chamber, the output end of the motor enters the first chamber and is coaxial with the first transmission wheel, and the steering screw passes through the partition plate and enters the second chamber and is coaxial with the second belt wheel.

3. The two-stage reduction belt-pulley steering gear of claim 2, wherein, The transmission rod is provided between the second transmission wheel and the first belt wheel, one end of the transmission rod is fixedly matched with the second transmission wheel, the other end of the transmission rod is fixedly matched with the first belt wheel, and the transmission rod is rotationally matched with the partition plate.

4. The two-stage reduction belt-pulley steering gear of claim 3 wherein, The partition plate is provided with a through hole through which the transmission rod passes, a bearing is mounted in the through hole, an inner ring of the bearing is sleeved on the outer peripheral wall of the transmission rod, and an outer ring of the bearing abuts against the inner peripheral wall of the through hole.

5. The two-stage reduction belt-pulley steering gear of claim 3 wherein, The inner peripheral wall of the second transmission wheel and the inner peripheral wall of the first belt wheel are respectively provided with grooves, and the transmission rod is provided with convex strips at both ends and matched with the grooves.

6. The two-stage reduction belt-pulley steering gear of claim 2 wherein, The housing comprises a first protective shell and a second protective shell, the first protective shell and the second protective shell are respectively located on both sides of the partition plate, the first protective shell surrounds the first chamber, and the second protective shell surrounds the second chamber.

7. The two-stage reduction belt-pulley steering gear of claim 6 wherein, The shape of the first protective shell matches the first synchronous belt, and the shape of the second protective shell matches the second synchronous belt.

8. The two-stage reduction belt-pulley steering gear of claim 6 wherein, The first protective shell is provided with a first sealing plate on the side away from the partition plate, the second protective shell is provided with a second sealing plate on the side away from the partition plate, and the output end of the motor passes through the first sealing plate and is coaxial with the first transmission wheel.

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