1. The utility model provides a little tooth difference cycloid reduction gear of miniature high accuracy which characterized in that: the planetary gear type planetary gear transmission mechanism comprises an output disc, a first planetary gear, a second planetary gear, a sun gear, a cycloidal gear, a pin gear shell, an input shaft, a first connecting pin and a second connecting pin;

two pin shafts are arranged on the inner side of the output disc at equal eccentric distance of 180 degrees, a central hole and an eccentric hole are respectively formed in the two planet wheels, the eccentric distances of the eccentric holes in the two planet wheels are equal and are deviated to the same side, and the two planet wheels are respectively in rotating fit with the two pin shafts on the output disc through the respective central holes;

the sun wheel is integrally processed at the inner end of the input shaft or fixedly arranged at the inner end of the input shaft, the sun wheel is meshed with the two planet wheels, and the outer end of the input shaft is a power input end;

two eccentric holes which are equal in eccentric distance and are arranged at an angle of 180 degrees are formed on the cycloid wheel; one end of the first connecting pin is in running fit with an eccentric hole on the first planet wheel, and the other end of the first connecting pin is in running fit with one eccentric hole on the cycloidal gear; one end of the second connecting pin is in running fit with an eccentric hole on the second planet wheel, and the other end of the second connecting pin is in running fit with another eccentric hole on the cycloidal gear;

the pin gear shell is a fixed part, and pin gear pins are uniformly arranged on the inner ring of the pin gear shell along the circumferential direction; the cycloid wheel is embedded in the needle gear shell and forms cycloid motion fit with the needle gear shell through the needle gear pin;

the output disc, the input shaft and the pin gear shell are coaxially arranged.

2. The miniature high-precision small-tooth-difference cycloidal reducer according to claim 1, characterized in that: the two output discs are respectively a front output disc and a rear output disc, the two output discs are respectively embedded at the front end and the rear end of the needle gear shell, the two output discs are fixedly connected through screws, a central shaft hole is formed in the rear output disc, and the outer end of the input shaft penetrates through the central shaft hole in the rear output disc and extends out of the rear side of the rear output disc.

3. The miniature high-precision small-tooth-difference cycloidal reducer according to claim 1, characterized in that: the first planet wheel is arranged on the front side and the rear side of the cycloidal gear and is connected through a first connecting pin, the first planet wheel positioned on the front side is rotatably supported on the front output disc, and the first planet wheel positioned on the rear side is rotatably supported on the rear output disc; no. two planet wheels are two around, and two No. two planet wheels in front and back set up in the front and back both sides of cycloid wheel to through No. two connecting pin connection, be located the No. two planet wheels of front side and rotate and support on preceding output dish, be located the No. two planet wheels of rear side and rotate and support on back output dish.

Background

With the continuous development of science and technology, in the transmission field, the miniaturization and the lightweight of reduction gear are an important trend, and in the miniature reduction gear field at present, conventional planetary reducer occupies main role, but its realization big drive ratio often needs complicated multilevel structure, brings not little degree of difficulty for manufacturing and assembly, and the cost is high or low.

The cycloid transmission is a structure easy to realize large transmission ratio, is mainly applied to the field of small and medium-sized speed reducers at present, and is not widely applied to the field of miniature speed reducers because part of components of the existing cycloid speed reducer structure are complex in shape and high in process difficulty, and is not beneficial to miniaturization due to the limitation of processing bottlenecks.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a miniature high-precision cycloid speed reducer with small tooth difference, which has the advantages of few internal structural components, easiness in processing, convenience in assembly, large transmission ratio and light weight.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a little tooth difference cycloid reduction gear of miniature high accuracy which characterized in that: the planetary gear type planetary gear transmission mechanism comprises an output disc, a first planetary gear, a second planetary gear, a sun gear, a cycloidal gear, a pin gear shell, an input shaft, a first connecting pin and a second connecting pin;

two pin shafts are arranged on the inner side of the output disc at equal eccentric distance of 180 degrees, a central hole and an eccentric hole are respectively formed in the two planet wheels, the eccentric distances of the eccentric holes in the two planet wheels are equal and are deviated to the same side, and the two planet wheels are respectively in rotating fit with the two pin shafts on the output disc through the respective central holes;

the sun wheel is integrally processed at the inner end of the input shaft or fixedly arranged at the inner end of the input shaft, the sun wheel is meshed with the two planet wheels, and the outer end of the input shaft is a power input end;

two eccentric holes which are equal in eccentric distance and are arranged at an angle of 180 degrees are formed on the cycloid wheel; one end of the first connecting pin is in running fit with an eccentric hole on the first planet wheel, and the other end of the first connecting pin is in running fit with one eccentric hole on the cycloidal gear; one end of the second connecting pin is in running fit with an eccentric hole on the second planet wheel, and the other end of the second connecting pin is in running fit with another eccentric hole on the cycloidal gear;

the pin gear shell is a fixed part, and pin gear pins are uniformly arranged on the inner ring of the pin gear shell along the circumferential direction; the cycloid wheel is embedded in the needle gear shell and forms cycloid motion fit with the needle gear shell through the needle gear pin;

the output disc, the input shaft and the pin gear shell are coaxially arranged.

Further: the two output discs are respectively a front output disc and a rear output disc, the two output discs are respectively embedded at the front end and the rear end of the needle gear shell, the two output discs are fixedly connected through screws, a central shaft hole is formed in the rear output disc, and the outer end of the input shaft penetrates through the central shaft hole in the rear output disc and extends out of the rear side of the rear output disc.

Further, the method comprises the following steps: the first planet wheel is arranged on the front side and the rear side of the cycloidal gear and is connected through a first connecting pin, the first planet wheel positioned on the front side is rotatably supported on the front output disc, and the first planet wheel positioned on the rear side is rotatably supported on the rear output disc; no. two planet wheels are two around, and two No. two planet wheels in front and back set up in the front and back both sides of cycloid wheel to through No. two connecting pin connection, be located the No. two planet wheels of front side and rotate and support on preceding output dish, be located the No. two planet wheels of rear side and rotate and support on back output dish.

The invention has the advantages and positive effects that:

1. according to the invention, the eccentric pin hole is directly processed on the planet wheel, and the planet wheel is connected with the cycloid wheel through the connecting pin, so that the structure is simplified and compact, and the requirement of small size of the miniature high-precision speed reducer can be better met.

2. The functional parts are 7-8 parts, and the functional parts are mainly connected together through tooth meshing and pin joint, so that the whole weight is light, and the multifunctional electric heating cooker has the advantages of easiness in processing and convenience in assembly.

3. The invention combines the planet transmission and the cycloid transmission well, the transmission ratio can reach 50 to 150, and the invention has larger transmission ratio.

4. The overall volume of the speed reducer can be within 4CM in diameter, and the size requirement of the miniature speed reducer is met.

Drawings

FIG. 1 is a simplified three-dimensional explosion schematic diagram of a miniature small tooth difference cycloidal reducer of the present invention;

fig. 2 is a schematic diagram of the optimized scheme three-dimensional explosion of the miniature small-tooth-difference cycloidal reducer.

Detailed Description

The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It is to be understood that this embodiment is illustrative and not restrictive.

A miniature high-precision cycloid speed reducer with small tooth difference is disclosed, please refer to FIGS. 1-2, and the invention points are as follows: mainly include output dish 1, planet wheel 2, sun gear 8, cycloid wheel 3, pin gear shell 4, input shaft 6, connecting pin 7, wherein, the planet wheel includes a planet wheel and No. two planet wheels, and the connecting pin includes a connecting pin and No. two connecting pins.

Two pin shafts 1.1 are arranged on the inner side of the output disc, and the two pin shafts are arranged at equal eccentric distance of 180 degrees. Two planet wheels are provided with a central hole 2.2 and an eccentric hole 2.1, and the eccentric distances of the eccentric holes on the two planet wheels are equal and are deviated to the same side. The two planet wheels are respectively in running fit with the two pin shafts on the output disc through mounting bearings through respective central holes.

The sun gear and the input shaft are of an integrated processing and forming structure, or the sun gear and the input shaft are fixed at the inner end of the output shaft after being processed and formed in a split mode. The sun gear is meshed with the two planet gears, and the outer end of the input shaft is a power input end which is in driving connection with the motor.

Two eccentric holes 3.1 are arranged on the cycloid wheel, and the two eccentric holes are arranged at equal eccentric distance and 180 degrees. One end of the first connecting pin is in running fit with an eccentric hole in the first planet wheel through a bearing, and the other end of the first connecting pin is in running fit with one eccentric hole in the cycloid wheel through a bearing. One end of the second connecting pin is in running fit with an eccentric hole in the second planet wheel through a bearing, and the other end of the second connecting pin is in running fit with another eccentric hole in the cycloid wheel through a bearing. During assembly and movement, the position of the eccentric hole on the first planet wheel and the position of the eccentric hole on the second planet wheel are required to be positioned on the same side.

The inner ring of the pin gear shell is uniformly provided with pin gear pins 5 along the circumferential direction, and the installation mode of the pin gear pins refers to the prior art and is not described herein again. The cycloid wheel is embedded in the needle gear shell and forms cycloid motion matching with the needle gear shell through the needle gear pin.

The output disc, the input shaft and the pin gear shell are coaxially arranged.

In the above structure, further: the two output discs are respectively a front output disc 1a and a rear output disc 1b, the two output discs are respectively embedded at the front end and the rear end of the needle gear shell, and the two output discs are fixedly connected through two screws 9. The front output disc is an actual power output disc of the speed reducer, the rear output disc is a rigid disc, the rigid disc is matched with the front output disc, the planet wheel, the sun wheel, the cycloidal wheel and the connecting pin are packaged in the pin gear shell, and bearings are mounted at two ends of the pin gear shell and are respectively in running fit with the front output disc and the rear output disc. And a central shaft hole is formed in the rear output disc, and the outer end of the input shaft penetrates through the central shaft hole in the rear output disc and extends out of the rear side of the rear output disc.

Further, the method comprises the following steps: the planet wheel is two around, and two front and back planet wheels set up in the front and back both sides of cycloid wheel to through a connecting pin connection, be located the round pin epaxial of output dish before planet wheel 2a of front side rotates the support, be located the round pin epaxial of output dish after planet wheel 2b of rear side rotates the support. The second planet wheel is two around, and two No. two front and back planet wheels set up in the front and back both sides of cycloid wheel to through No. two connecting pin connections, be located the round pin axle of output dish before the rotation of No. two planet wheels of front side supports, be located the round pin axle of output dish at the back after the rotation of No. two planet wheels of rear side supports. By adopting the arrangement mode of the two first planet wheels and the two first planet wheels, the bearing capacity and the operation stability of the speed reducing mechanism are improved.

In the above structure, the pin gear case is a fixed component of the speed reducer, and the central axis of the output disc is always coincident with the central axis of the pin gear case when the output disc moves, that is, the two components can rotate relatively. The center holes of the first planetary gear and the second planetary gear are matched with the two pin shafts on the output disc, and the relative rotation can be realized during movement; the connecting pin is matched with the eccentric hole on the planet wheel and the eccentric hole on the cycloidal gear at the same time, and the three can realize relative rotation during movement; the central axis of the input shaft is always coincident with the central axis of the output disc and the central axis of the needle gear shell when moving, and the sun gear at the inner end of the input shaft is meshed with the two planetary gears when moving.

The motion process of the miniature high-precision small-tooth-difference cycloid speed reducer is as follows:

the input torque of the input shaft is transferred to the two planet gears through the sun gear at the inner end of the input shaft; two planetary wheels rotate around two pin shafts on the output disc simultaneously; when the planet wheel rotates, the motion is transmitted to the cycloid wheel through the connecting pin; the cycloid wheel is meshed with the needle gear shell, and the needle gear shell has a reaction force on the cycloid wheel in the meshing process because the needle gear shell is fixed; the cycloid wheel transmits the motion to the output disc through the connecting pin and the planet wheel; the output disc outputs the motion by rotating.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the scope of the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.