CN113280085A

CN113280085A - Zero-tooth-difference transmission power unit

Info

Publication number: CN113280085A
Application number: CN202110729920.7A
Authority: CN
Inventors: 房卫东; 俞俊海; 周志坚; 段悠扬
Original assignee: Hefei Bolin Advanced Materials Co ltd
Current assignee: Hefei Bolin Advanced Materials Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-08-20

Abstract

The invention discloses a zero-tooth-difference transmission power unit which comprises an output shaft, a duplicate gear and an eccentric shaft which are coaxially arranged, wherein the duplicate gear comprises a first gear and a second gear which are coaxially and fixedly connected and have tooth differences; the periphery of the first gear is sleeved with a fixed inner gear ring which is meshed with the first gear and has a gear difference; the eccentric shaft penetrates through the center of the duplicate gear, and the top of the eccentric shaft is arranged in the accommodating cavity; and a motor for driving the eccentric shaft to rotate is arranged at the bottom of the eccentric shaft. The motor and the controller of the motor are integrated into the speed reducing mechanism, the structure is compact and small, the purpose of reducing the return clearance is realized, the application flexibility of the product is greatly increased, and the speed reducing mechanism has the advantages of large speed reducing ratio and high transmission precision.

Description

Zero-tooth-difference transmission power unit

Technical Field

The invention relates to the technical field of reduction gears of speed reducers, in particular to a zero-tooth-difference transmission power unit.

Background

The speed reducer is used for matching the rotating speed and transmitting torque between the prime mover and the working machine, and the main purpose of the speed reducer is to reduce the rotating speed and increase the torque. The existing speed reducer can be divided into a worm speed reducer, a cycloidal pin gear speed reducer, a planetary speed reducer, a harmonic speed reducer and the like according to different transmission structures, and the existing speed reducer is respectively suitable for different places.

The planetary speed reducer with small tooth number difference is one kind of planetary speed reducer, and has mainly meshed gear pair comprising outer gear and inner gear with different tooth number difference to reduce rotation speed and increase torque. The traditional planetary reduction ratio with small tooth difference is formed by overlapping a plurality of stages of planetary reduction mechanisms, an external motor is also required to provide power, and the corresponding space and efficiency have great defects.

Disclosure of Invention

The invention aims to provide a zero-tooth-difference transmission power unit, which solves the problems in the prior art, reduces the overall size of a speed reducer, increases a speed reduction ratio, reduces a return clearance and improves transmission precision.

In order to achieve the purpose, the invention provides the following technical scheme:

a zero-tooth-difference transmission power unit comprises an output shaft, a duplicate gear and an eccentric shaft which are coaxially arranged, wherein the duplicate gear comprises a first gear and a second gear which are coaxially and fixedly connected and have tooth differences; the periphery of the first gear is sleeved with a fixed inner gear ring which is meshed with the first gear and has a gear difference; the eccentric shaft penetrates through the center of the duplicate gear, and the top of the eccentric shaft is arranged in the accommodating cavity; and a motor for driving the eccentric shaft to rotate is arranged at the bottom of the eccentric shaft.

As a further scheme of the invention: the motor comprises a motor shell, a stator and a rotor which are coaxially sleeved from outside to inside in sequence; the eccentric shaft penetrates through the center of the rotor and is fixedly connected with the rotor, and the stator is fixedly connected with the motor shell.

As a further scheme of the invention: the motor also comprises a controller, wherein the controller is arranged at the bottom of the eccentric shaft and comprises a controller seat and a controller body accommodated in the controller seat.

As a further scheme of the invention: the motor further comprises a heat dissipation cover, and the heat dissipation cover is arranged at the bottom of the controller seat.

As a further scheme of the invention: the motor further comprises a motor blocking cover, and the motor blocking cover is sleeved on the periphery of the eccentric shaft between the duplicate gear and the stator.

As a further scheme of the invention: and a skeleton oil seal is arranged at the joint of the motor blocking cover and the eccentric shaft.

As a further scheme of the invention: and a retainer ring groove is formed in the top end of the fixed inner gear ring, and a retainer ring for a hole is accommodated in the retainer ring groove.

Compared with the prior art, the invention has the beneficial effects that:

the motor and the controller of the motor are integrated into the speed reducing mechanism, the structure is compact, the size is small, the purpose of reducing the return clearance is realized, and the application flexibility of the product is greatly improved. The eccentric shaft drives the first gear of the duplicate gear, the fixed inner gear ring is meshed with the first gear in small tooth difference to generate speed reduction, the second gear of the duplicate gear is meshed with the inner gear ring of the output shaft in zero tooth difference to transmit the reduced rotating speed and torque, and the dual-gear transmission device has the advantages of large speed reduction ratio and high transmission precision.

Drawings

FIG. 1 is a side cross-sectional view of the present invention;

FIG. 2 is an exploded view of the present invention;

in the figure: 1-output shaft, 11-containing cavity, 2-duplicate gear, 21-first gear, 22-second gear, 3-eccentric shaft, 4-fixed inner gear ring, 41-retainer groove, 42-retainer ring for hole, 5-motor, 51-motor shell, 52-stator, 53-rotor, 54-motor retainer cover, 55-skeleton oil seal, 56-heat dissipation cover, 57-controller, 571-controller seat, 572-controller body, 6-gear bearing, 7-output shaft bearing, 8-inner gear ring bearing, 9-controller bearing and 10-shaft end retainer ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, in an embodiment of the present invention, a zero-tooth-difference transmission power unit includes an output shaft 1, a duplicate gear 2, and an eccentric shaft 3, which are coaxially disposed, where the duplicate gear 2 includes a first gear 21 and a second gear 22, which are coaxially fixed and have tooth differences, and the diameter of the first gear 21 is larger than that of the second gear 22. The bottom of the output shaft 1 is axially provided with an accommodating cavity 11, the second gear 22 is accommodated in the accommodating cavity 11, the accommodating cavity 11 is provided with an inner gear ring profile matched with an outer gear ring of the second gear 22, and the inner gear ring is meshed with the outer gear ring of the second gear 22 in a zero-tooth-difference mode; the first gear 21 is peripherally sleeved with a fixed ring gear 4 meshed with the first gear. The eccentric shaft 3 penetrates through the center of the duplicate gear 2, and the top of the eccentric shaft 3 is arranged in the accommodating cavity 11; the bottom of the eccentric shaft 3 is provided with a motor 5 for driving the eccentric shaft to rotate.

Where i represents the gear ratio, Z1 represents the number of teeth of the first gear 21, and Z2 represents the number of teeth of the fixed ring gear 4.

It should be noted that, as shown in fig. 2, the diameter of the first gear 21 is set to be larger than that of the second gear 22 in the present embodiment, but the small-diameter gear is not limited to be a zero-teeth-difference transmission gear in the zero-teeth-difference transmission of the present invention.

Further, the motor 5 comprises a motor housing 51, a stator 52 and a rotor 53 which are coaxially sleeved together from outside to inside in sequence; wherein, the eccentric shaft 3 passes through the center of the rotor 53 and is fixedly connected with the rotor, the stator 52 is fixedly connected with the motor shell 51, and the motor shell 51 is fixedly connected with the fixed inner gear ring 4; the controller 57 is disposed at the bottom of the eccentric shaft 3, the controller 57 includes a controller seat 571 and a controller body 572 accommodated in the controller seat 571, and the controller seat 571 is fixedly connected to the motor housing 51. The eccentric shaft 3 is equivalent to an input shaft, the rotor 53 is driven to rotate at a high speed by the controller 57, the high-speed rotation of the rotor 53 provides power for the eccentric shaft 3 to drive the eccentric shaft 3 to rotate, the eccentric shaft 3 drives the dual gear 2 to rotate, and then the dual gear 2 drives the output shaft 1 to rotate.

Further, the sealing and heat dissipation of the two ends of the motor 5 are realized through the heat dissipation cover 56 and the motor blocking cover 54, wherein the heat dissipation cover 56 is arranged at the bottom of the controller seat 571 in a covering manner; the motor blocking cover 54 is sleeved on the periphery of the eccentric shaft 3 between the duplicate gear 2 and the stator 52, and a skeleton oil seal 55 is arranged at the joint of the motor blocking cover 54 and the eccentric shaft 3. The top end of the fixed ring gear 4 is provided with a retainer groove 41, and a retainer ring 42 for a hole is accommodated in the retainer groove 41. The circlip 42 serves to axially fix the overall structure.

Further, as shown in fig. 1, the controller seat 571, the motor housing 51, and the fixed ring gear 4 are sequentially fixed along a direction close to the output end of the output shaft 1 to realize circumferential fixation, and the two ends are axially limited by the heat dissipation cover 56 and the retainer ring 42 for hole, so as to form an approximately closed whole, which is compact and small in structure.

The installation sequence of the invention is as follows:

firstly, assembling a zero-tooth-difference speed reducing mechanism:

1. one of the two output shaft bearings 7 is pressed into the periphery of the output shaft 1, and the other output shaft bearing is pressed into a counter bore of the output shaft 1; 2. pressing the inner gear ring bearing 8 into the fixed inner gear ring 4;

3. pressing an output shaft 1 provided with 2 output shaft bearings 7 into a fixed inner gear ring 4 provided with an inner gear ring bearing 8 by using a tool;

4. the retainer ring 42 for a hole is fitted into a retainer groove of the fixed ring gear 4;

5. and pressing the two gear bearings 6 into the inner ring of the duplicate gear 2 to form the duplicate gear assembly.

Secondly, assembling the motor component

6. Pressing the rotor 53 onto the eccentric shaft 3 of the motor;

7. pressing the stator 52 into the motor housing 51;

8. mounting the frame oil seal 55 into the motor cover 54;

9. pressing the controller bearing 9 into the controller seat 571;

10. inserting the eccentric shaft 3 with the rotor 53 into the motor housing 51 with the stator 52;

11. sleeving a motor baffle cover 54 provided with a framework oil seal 55 on the eccentric shaft 3 and installing the motor baffle cover into the motor shell 51;

12. the controller holder 571 having the controller bearing 9 mounted thereon is attached to the motor housing 51, and the rotation of the eccentric shaft 3 is smooth.

Thirdly, assembling the controller component

13. Fixing the controller body 572 to the heat dissipation cover 56 with screws, and filling a gap between the controller body 572 and the heat dissipation cover 56 with heat dissipation silicone;

14. the connecting motor cable is mounted to the controller body 572, and the power supply wire and the associated cable are led out of the controller seat 571;

15. the heat radiating cover 56 with the controller body 572 attached thereto is fixed to the controller base 571.

Fourthly, final assembly

16. Sleeving the duplex gear assembly on the eccentric shaft 3;

17. mounting the shaft end retainer ring 10 on the eccentric shaft 3;

18. installing the motor assembly component, the controller assembly component and the duplex gear component on the eccentric shaft 3 into the fixed inner gear ring 4 and the output shaft 1;

19. the motor assembly and the controller assembly are fixed to the fixed ring gear 4 with screws.

The working principle of the invention is as follows:

the invention integrates the speed reducing mechanism, the motor and the controller of the motor. The controller is matched with corresponding operation software, the motion parameters of the motor can be set in an interface of the operation software, a power supply is started after the setting is finished, and the eccentric shaft 3 provided with the rotor 53 rotates; the fixed inner gear ring 4 and the first gear 21 have a gear difference, so the duplicate gear 2 sleeved on the eccentric shaft 3 performs speed reduction rotation under the driving of the eccentric shaft 3 and the meshing action with the fixed inner gear ring 4; the second gear 22 is meshed with the inner gear ring of the output shaft 1 in a zero gear difference mode, and the output shaft 1 transmits the rotating speed of the duplicate gear in a ratio of 1: 1.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A zero-tooth-difference transmission power unit comprises an output shaft (1), a duplicate gear (2) and an eccentric shaft (3) which are coaxially arranged, and is characterized in that the duplicate gear (2) comprises a first gear (21) and a second gear (22) which are coaxially and fixedly connected and have tooth differences, the bottom of the output shaft (1) is axially provided with an accommodating cavity (11), the second gear (22) is accommodated in the accommodating cavity (11), and an outer gear ring of the second gear (22) is meshed with the inner wall of the output shaft (1) in a zero-tooth-difference mode; the periphery of the first gear (21) is sleeved with a fixed inner gear ring (4) which is meshed with the first gear and has a gear difference; the eccentric shaft (3) penetrates through the center of the duplicate gear (2), and the top of the eccentric shaft (3) is arranged in the accommodating cavity (11); and a motor (5) for driving the eccentric shaft (3) to rotate is arranged at the bottom of the eccentric shaft.

2. The zero-tooth-difference transmission power unit according to claim 1, characterized in that the motor (5) comprises a motor shell (51), a stator (52) and a rotor (53) which are coaxially sleeved from outside to inside in sequence; the eccentric shaft (3) penetrates through the center of the rotor (53) and is fixedly connected with the rotor, and the stator (52) is fixedly connected with the motor shell (51).

3. A zero tooth difference transmission power unit according to claim 2, characterized in that the motor (5) further comprises a controller (57), the controller (57) is arranged at the bottom of the eccentric shaft (3), and the controller (57) comprises a controller seat (571) and a controller body (572) accommodated in the controller seat (571).

4. The zero-backlash transmission power unit according to claim 3, wherein the motor (5) further comprises a heat dissipation cover (56), and the heat dissipation cover (56) is arranged at the bottom of the controller seat (571) in a covering manner.

5. The zero gear difference transmission power unit according to claim 2, characterized in that the motor (5) further comprises a motor blocking cover (54), and the motor blocking cover (54) is sleeved on the periphery of the eccentric shaft (3) between the duplicate gear (2) and the stator (52).

6. The zero-tooth-difference transmission power unit is characterized in that a framework oil seal (55) is arranged at the joint of the motor blocking cover (54) and the eccentric shaft (3).

7. The zero-tooth-difference transmission power unit is characterized in that a retainer groove (41) is formed in the top end of the fixed inner gear ring (4), and a hole retainer ring (42) is accommodated in the retainer groove (41).