Combined two-stage speed reducing mechanism

Abstract

The utility model discloses a combined type two-stage speed reducing mechanism which comprises a worm and gear speed reducing assembly and a cycloidal pin gear speed reducing assembly, the worm and gear speed reducing assembly comprises a motor, a worm connected with the motor and a worm gear meshed with the worm, the cycloidal pin gear speed reducing assembly comprises an angle sensor, a rotating shaft and a cycloidal gear, and the angle sensor is arranged at one end of the rotating shaft. The worm gear is connected with the rotating shaft in a fastening mode, the worm gear is located between the angle sensor and the cycloidal gear, and the angle sensor is electrically connected with the motor. The motor drives the worm gear to rotate through the worm, the worm gear drives the rotating shaft to rotate, the rotating shaft drives the cycloidal gear to rotate, and the angle sensor collects the angle change value of the rotating shaft and transmits information to the controller. The speed reducer has the characteristics of high bearing capacity, high transmission precision, self-locking, large speed ratio, high reliability and the like, and can meet the requirements of users.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile steering, and particularly relates to a combined two-stage speed reduction mechanism. BACKGROUND

[0002] The worm gear reducer is a power transmission mechanism, which utilizes the speed converter of the gear to reduce the rotation number of the wheel hub motor to the desired rotation number and obtain a mechanism with larger torque. Although the worm gear reducer has self-locking performance and a larger transmission ratio, the worm gear reducer has a larger volume and lower transmission efficiency. The cycloid pin wheel transmission machine is a transmission mechanism using a cycloid gear. The transmission frame is similar to the involute little-tooth-difference planetary gear. Compared with the worm gear reducer, the cycloid pin wheel transmission machine has the advantages of larger transmission efficiency, smaller transmission gap and smaller volume. However, the cycloid pin wheel transmission machine does not have self-locking performance and has a lower transmission ratio. In the automobile steering system, the speed reducer is a core key component, which is required to have the characteristics of high load capacity, high transmission precision, self-locking, large speed ratio, high reliability and the like. The single worm gear reducer and the single cycloid pin wheel transmission machine cannot meet the requirements. SUMMARY

[0003] In view of the above technical problems, the utility model provides a combined two-stage speed reduction mechanism, which has the advantages of both the worm gear reducer and the cycloid pin wheel reducer, the total transmission ratio can reach 464, the output torque can reach 1185Nm, and the combined two-stage speed reduction mechanism has the characteristics of high load capacity, high transmission precision, self-locking, high reliability and the like, and can meet the requirements of users.

[0004] The technical scheme adopted by the utility model is as follows: a combined two-stage speed reduction mechanism, which comprises a worm gear reducer and a cycloid pin wheel reducer. The worm gear reducer comprises a motor, a worm connected with the motor and a worm gear engaged with the worm. The cycloid pin wheel reducer comprises an angle sensor, a rotating shaft and a cycloid gear. The angle sensor is arranged at one end of the rotating shaft, and the cycloid gear is sleeved on the other end of the rotating shaft. The worm gear is tightly connected with the rotating shaft and located between the angle sensor and the cycloid gear. The angle sensor is electrically connected with the motor.

[0005] Optionally, the rotating shaft is provided with a clamping protrusion, and the inner wall of the worm gear is provided with a clamping groove matched with the clamping protrusion.

[0006] Optionally, the rotating shaft comprises a first connecting shaft, a second connecting shaft and a third connecting shaft connected in sequence. The diameter of the first connecting shaft is smaller than that of the second connecting shaft, and the diameter of the second connecting shaft is smaller than that of the third connecting shaft. The angle sensor is arranged on the first connecting shaft, the second connecting shaft is provided with the clamping protrusion, and the cycloid gear is arranged on the third connecting shaft.

[0007] Optionally, the second connecting shaft is provided with a ring groove, a check ring is installed in the ring groove, the check ring protrudes from the ring groove, one side of the worm wheel abuts against the check ring, and the other side of the worm wheel abuts against the third connecting shaft.

[0008] Optionally, the first connecting shaft comprises a first connecting part and a second connecting part detachably connected with the first connecting part, the angle sensor is installed on the first connecting part through a first bearing, and the second connecting part is connected with the second connecting shaft.

[0009] Optionally, the shell comprises an end cover, a first shell, a second shell and a third shell, the first shell is provided with a first cavity for accommodating the angle sensor, the second shell is provided with a second cavity for accommodating the worm wheel and the cycloid gear, and the third shell is provided with a third cavity for accommodating the worm.

[0010] Optionally, the second connecting part is provided with a second bearing, an outer ring of the second bearing abuts against an inner circumferential wall of the first shell, the second connecting part is provided with a wave-shaped elastic sheet, one side of the wave-shaped elastic sheet abuts against the second bearing, and the other side of the wave-shaped elastic sheet abuts against the second connecting shaft.

[0011] Optionally, the gap adjusting assembly comprises a pressing block, a pressing plug and a spring, one end of the worm away from the motor is provided with a third bearing, one end of the pressing block abuts against an outer ring of the third bearing, the other end of the pressing block is provided with a first groove, the pressing plug is provided with a second groove, the first groove and the second groove are correspondingly arranged to form a cavity for accommodating the spring, and the pressing plug is tightly connected with the third shell.

[0012] The motor drives the worm to rotate, the worm drives the worm wheel to rotate, the worm wheel drives the rotating shaft to rotate, the rotating shaft drives the cycloid gear to rotate, the angle sensor collects the angle change value of the rotating shaft, and information is transmitted to the controller, the controller controls the rotating speed of the motor, the combined two-stage speed reduction mechanism has the advantages of both the worm and gear speed reduction assembly and the cycloid pin gear speed reduction assembly, the total transmission ratio can reach 464, the output torque can reach 1185Nm, the combined two-stage speed reduction mechanism has the characteristics of high bearing capacity, high transmission precision, self-locking, high reliability and the like, and can meet the needs of users. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A structure diagram of the combined two-stage speed reduction mechanism is provided for the embodiment of the utility model;

[0014] Figure 2 A structure diagram of the combined two-stage speed reduction mechanism is provided for the embodiment of the utility model;

[0015] Figure 3The utility model discloses a combined two-stage speed reduction mechanism's pivot's schematic diagram for the embodiment of the utility model.

[0016] Figure 4 The utility model discloses a combined two-stage speed reduction mechanism's gap adjusting assembly's schematic diagram for the embodiment of the utility model.

[0017] The mark in each drawing is: 1, motor;2, worm;3, worm wheel;4, angle sensor;5, pivot;6, cycloidal gear;7, first connecting shaft;8, second connecting shaft;9, third connecting shaft;10, clamping convex;11, wave spring;12, check ring;13, first connecting portion;14, second connecting portion;15, end cover;16, first shell;17, second shell;18, third shell;19, second bearing;20, pressing block;21, pressing plug;22, spring. Specific implementation

[0018] The application will be further explained in detail below in connection with the drawings and embodiments.

[0019] As Figure 1 The utility model discloses a combined two-stage speed reduction mechanism, including worm wheel 3 worm 2 speed reduction subassembly and cycloidal gear speed reduction subassembly, worm wheel 3 worm 2 speed reduction subassembly includes motor 1, with motor 1 connects the worm 2 and with the meshing of worm 2 worm wheel 3, the cycloidal gear speed reduction subassembly includes angle sensor 4, pivot 5 and cycloidal gear 6, the angle sensor is located pivot 5 one end, the cycloidal gear 6 is set up in pivot 5 the other end, the worm wheel 3 is fastened connection with pivot 5, the worm wheel 3 is located between angle sensor and cycloidal gear 6, angle sensor 4 with motor 1 electricity is connected. Motor 1 drives worm wheel 3 rotation through worm 2, and worm wheel 3 drives pivot 5 rotation, and pivot 5 drives wheel cycloidal gear 6 rotation, and angle sensor 4 gathers pivot 5's angle change value, and will information delivery for controller, and controller controls motor 1's rotating speed, and combined two-stage speed reduction mechanism has the both of worm wheel 3 worm 2 speed reduction subassembly and cycloidal gear speed reduction subassembly's point, and total transmission ratio can reach 464, and output torque can reach 1185Nm, has high bearing capacity, transmission precision is high, can be self-locking, and reliability is high and so on, can satisfy the user required. Controller can be integrated in the inside of motor 1.

[0020] In the embodiment, as Figure 3As shown, the rotating shaft 5 has a locking protrusion 10, and the inner circumferential wall of the worm gear 3 has a locking groove that mates with the locking protrusion 10. This prevents circumferential relative sliding between the worm gear 3 and the rotating shaft 5. The rotating shaft 5 includes a first connecting shaft 7, a second connecting shaft 8, and a third connecting shaft 9 connected in sequence. The diameter of the first connecting shaft 7 is smaller than the diameter of the second connecting shaft 8, and the diameter of the second connecting shaft 8 is smaller than the diameter of the third connecting shaft 9. The angle sensor 4 is located on the first connecting shaft 7, the second connecting shaft 8 has the locking protrusion 10, and the cycloidal wheel 6 is located on the third connecting shaft 9. The second connecting shaft 8 forms a step on the first connecting shaft 7, and the third connecting shaft 9 forms a step on the second connecting shaft 8. The second connecting shaft 8 has an annular groove, and a retaining ring 12 is installed in the annular groove. The retaining ring 12 protrudes from the annular groove. One side of the worm gear 3 abuts against the retaining ring 12, and the other side of the worm gear 3 abuts against the third connecting shaft 9. The retaining ring 12 and the third connecting shaft 9 are located on both sides of the worm gear 3, limiting the movement of the worm gear 3 and preventing it from moving axially.

[0021] In this embodiment, the first connecting shaft 7 includes a first connecting portion 13 and a second connecting portion 14 detachably connected to the first connecting portion 13. The angle sensor 4 is mounted on the first connecting portion 13 via a first bearing, and the second connecting portion 14 is connected to the second connecting shaft 8. The second connecting portion 14, the second connecting shaft 8, and the third connecting shaft 9 are integrated into one piece. The first connecting portion 13 and the second connecting portion 14 are connected by screws, facilitating sensor assembly and disassembly. The second connecting portion 14 is fitted with a second bearing 19, the outer ring of which abuts against the inner peripheral wall of the first housing 16. The second connecting portion 14 is also fitted with a wave spring 11, one side of which abuts against the second bearing 19, and the other side abuts against the second connecting shaft 8. The wave spring 11 is a wave spring 22. The wave spring 11 has a large stiffness range and strong damping and vibration absorption capacity, enabling axial clearance compensation for the rotating shaft 5.

[0022] like Figure 2 As shown, the system also includes a housing, which comprises an end cap 15, a first housing 16, a second housing 17, and a third housing 18. The first housing 16 has a first cavity for accommodating the angle sensor 4. The second housing 17 has a second cavity for accommodating the worm gear 3 and the cycloidal wheel 6. The third housing 18 has a third cavity for accommodating the worm 2. The first, second, and third cavities are sequentially connected. The end cap 15 is connected to the first housing 16. The second housing 17 and the third housing 18 can be integrally formed. The end cap 15 has a retaining post along its circumference. One end of the first housing 16 has a retaining groove along its circumference that is interference-fitted with the retaining post. The other end of the first housing 16 has a screw hole that mates with the second housing 17. The first housing 16 can be connected to the second housing 17 by screws, or by retaining posts and grooves.

[0023] In this embodiment, as shown in Figure 4 The gap adjusting assembly includes a pressing block 20, a pressing plug 21 and a spring 22. The worm 2 is provided with a third bearing at the end away from the motor 1. The pressing block 20 abuts against the outer ring of the third bearing at one end. The other end of the pressing block 20 is provided with a first recess. The pressing plug 21 is provided with a second recess. The first recess and the second recess are correspondingly arranged to form a cavity for accommodating the spring 22. The pressing plug 21 is fastened to the third housing 18. The spring 22 is adjusted to press the pressing block 20, which in turn presses the third bearing, so as to adjust the meshing gap between the worm 2 and the worm wheel 3.

[0024] It can be understood that the specific embodiments described above are only used to explain the related utility model, but not limit the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings. The multiple technical solutions in the same embodiment, and the multiple technical solutions between 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, are also included in the protection scope of the utility model.

Claims

1. A combined two-stage reduction mechanism, characterized in that, The device includes a worm gear reducer assembly and a cycloidal pinwheel reducer assembly. The worm gear reducer assembly includes a motor, a worm connected to the motor, and a worm wheel meshing with the worm. The cycloidal pinwheel reducer assembly includes an angle sensor, a rotating shaft, and a cycloidal wheel. The angle sensor is located at one end of the rotating shaft, and the cycloidal wheel is sleeved at the other end of the rotating shaft. The worm wheel is fastened to the rotating shaft and is located between the angle sensor and the cycloidal wheel. The angle sensor is electrically connected to the motor.

2. The combined two-stage reduction mechanism according to claim 1, characterized in that, The rotating shaft is provided with a locking protrusion, and the inner peripheral wall of the worm gear is provided with a locking groove that mates with the locking protrusion.

3. The combined two-stage reduction mechanism according to claim 2, characterized in that, The rotating shaft includes a first connecting shaft, a second connecting shaft, and a third connecting shaft connected in sequence. The diameter of the first connecting shaft is smaller than the diameter of the second connecting shaft, and the diameter of the second connecting shaft is smaller than the diameter of the third connecting shaft. The angle sensor is located on the first connecting shaft, the second connecting shaft has the locking protrusion, and the cycloidal wheel is located on the third connecting shaft.

4. The combined two-stage reduction mechanism according to claim 3, characterized in that, The second connecting shaft is provided with an annular groove, and a retaining ring is installed in the annular groove. The retaining ring protrudes from the annular groove, and one side of the worm gear abuts against the retaining ring, while the other side of the worm gear abuts against the third connecting shaft.

5. The combined two-stage reduction mechanism according to claim 3, characterized in that, The first connecting shaft includes a first connecting part and a second connecting part detachably connected to the first connecting part. The angle sensor is mounted on the first connecting part via a first bearing, and the second connecting part is connected to the second connecting shaft.

6. The combined two-stage reduction mechanism according to claim 5, characterized in that, It also includes a housing, which includes an end cap, a first housing, a second housing, and a third housing. The first housing has a first cavity for accommodating the angle sensor, the second housing has a second cavity for accommodating the worm gear and the cycloidal wheel, and the third housing has a third cavity for accommodating the worm. The first cavity, the second cavity, and the third cavity are connected in sequence, and the end cap is connected to the first housing.

7. The combined two-stage reduction mechanism according to claim 6, characterized in that, The second connecting part is fitted with a second bearing, the outer ring of the second bearing abuts against the inner peripheral wall of the first housing, and the second connecting part is fitted with a wave spring, one side of the wave spring abuts against the second bearing, and the other side of the wave spring abuts against the second connecting shaft.

8. The combined two-stage reduction mechanism according to claim 1, characterized in that, It also includes a gap adjustment assembly, which includes a pressure block, a pressure plug, and a spring. The end of the worm gear away from the motor is provided with a third bearing. One end of the pressure block abuts against the outer ring of the third bearing, and the other end of the pressure block is provided with a first groove. The pressure plug is provided with a second groove. The first groove and the second groove are correspondingly arranged to form a cavity to accommodate the spring. The pressure plug is fastened to the third housing.

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