阅读说明：本技术 一种少齿差行星齿轮传动结构 (Planetary gear transmission structure with small tooth difference ) 是由 卜庆团 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种少齿差行星齿轮传动结构,包括箱体、偏心输入轴套、外齿轮、曲轴和内齿圈架；内齿圈架包括自左至右依次同轴设置的内齿圈、架体和输出轴；偏心输入轴套包括轴套部分和设置在轴套部分上的偏心凸起部分,轴套部分的左端架设安装在左端盖上、右端架设安装在架体上；外齿轮对应内齿圈的位置通过转臂轴承同轴架设安装在偏心输入轴套的偏心凸起部分上、且外齿轮与内齿圈啮合配合连接；曲轴沿外齿轮的周向方向均布设置为多件,曲轴的两端分别通过曲轴轴承架设安装在左端盖和外齿轮的端面上。本少齿差行星齿轮传动结构简化整机结构、降低零件个数、提高减速机的整机传动效率,不仅可以实现降低成本、而且可以实现便于加工与装配。(The invention discloses a small tooth difference planetary gear transmission structure, which comprises a box body, an eccentric input shaft sleeve, an external gear, a crankshaft and an internal ring gear frame, wherein the box body is provided with a plurality of planetary gear sets; the inner gear ring frame comprises an inner gear ring, a frame body and an output shaft which are coaxially arranged from left to right in sequence; the eccentric input shaft sleeve comprises a shaft sleeve part and an eccentric bulge part arranged on the shaft sleeve part, wherein the left end of the shaft sleeve part is erected and installed on the left end cover, and the right end of the shaft sleeve part is erected and installed on the frame body; the position of the external gear corresponding to the inner gear ring is coaxially erected and installed on an eccentric convex part of the eccentric input shaft sleeve through a rotating arm bearing, and the external gear is in meshed fit connection with the inner gear ring; the bent axle sets up to many along the circumference direction equipartition of external gear, and the both ends of bent axle are installed on the terminal surface of left end cover and external gear through bent axle bearing frame respectively. The small-tooth-difference planetary gear transmission structure simplifies the whole structure, reduces the number of parts, improves the whole transmission efficiency of the speed reducer, and not only can realize cost reduction, but also can realize convenient processing and assembly.)

1. A small-tooth-difference planetary gear transmission structure comprises a box body (1), wherein the box body (1) is of a cylindrical structure with a cylindrical inner cavity, and the left end and the right end of the cylindrical structure comprise a left end cover (11) and a right end cover (12) which are fixedly installed and connected; it is characterized in that the preparation method is characterized in that,

the small-tooth-difference planetary gear transmission structure also comprises an eccentric input shaft sleeve (2), an external gear (3), a crankshaft (4) and an internal gear ring rack (5);

the inner gear ring frame (5) and the cylindrical structure of the box body (1) are coaxially arranged, and the inner gear ring frame (5) comprises an inner gear ring (51), a frame body (52) and an output shaft (53) which are coaxially arranged from left to right in sequence; the outer surface of the inner gear ring (51) along the radial direction is erected and installed on the inner surface of the cylindrical structure of the box body (1) through a second bearing (13), and a tooth part structure is arranged on the inner surface of the inner gear ring (51) along the radial direction; the frame body (52) is erected and installed on the right end cover (12) through a third bearing (14);

the eccentric input shaft sleeve (2) comprises a shaft sleeve part and an eccentric bulge part arranged on the shaft sleeve part, the axial lead of the eccentric bulge part is parallel to the axial lead of the shaft sleeve part, the left end of the shaft sleeve part is erected and installed on the left end cover (11) through a bearing I (15), the right end of the shaft sleeve part is erected and installed on the frame body (52) through a bearing II (21), and the shaft sleeve part is coaxially sleeved and installed with the power input shaft;

the position of the external gear (3) corresponding to the internal gear ring (51) is coaxially erected and installed on the eccentric convex part of the eccentric input shaft sleeve (2) through a tumbler bearing (31), and the external gear (3) is meshed and matched with the internal gear ring (51);

the crankshafts (4) are uniformly distributed and arranged into a plurality of parts along the circumferential direction of the external gear (3), and two ends of the crankshafts (4) are respectively installed on the end surfaces of the left end cover (11) and the external gear (3) through crankshaft bearing frames.

2. The planetary gear transmission structure with small tooth difference according to claim 1, wherein the crankshaft (4) comprises a left large diameter section and a right small diameter section which are eccentrically arranged, the left large diameter section is mounted on the left end cover (11) in an erected mode through a crankshaft bearing I (41), and the right small diameter section is mounted on the end face of the external gear (3) in an erected mode through a crankshaft bearing II (42).

3. A small tooth difference planetary gear transmission structure according to claim 1 or 2, characterized in that the rocker bearings (31) are arranged in a double row in the left-right direction.

4. A planetary gear transmission structure with small tooth difference according to claim 1 or 2, characterized in that the sleeve part of the eccentric input sleeve (2) is connected with the power input shaft by a flat key structure.

Technical Field

The invention relates to a gear transmission structure, in particular to a small tooth difference planetary gear transmission structure, and belongs to the technical field of speed reducers.

Background

The planetary gear transmission with small tooth difference is a form of planetary gear transmission, and is a pair of internal gear pairs consisting of an external gear and an internal gear, and adopts involute tooth form, and the tooth number difference of internal and external gears is less, and generally 1-4 teeth are different, so that the transmission with small tooth difference is called small tooth difference transmission for short. The transmission of the planetary gear with small tooth difference has the advantages of large transmission ratio, small volume, light weight, convenient processing and the like, and is widely applied to various industries at present.

At present, a few-tooth-difference planetary gear transmission structure generally has two structural forms, one is an N-type planetary gear transmission structure, and the other is an NN-type planetary gear transmission structure. The output modes of the N-type planetary gear transmission structure mainly pass through independent output mechanisms such as a double universal coupling type, a cross-shaped sliding block type, a floating disc type, a hole pin type, a zero tooth difference type and the like, the output modes are not only complicated in structure and increase in part processing and assembly, but also the singly added primary output mechanism inevitably consumes partial power and reduces the overall output efficiency of the speed reducer to different degrees; the NN type planetary gear transmission structure can be divided into an external gear output and an internal gear output, but two pairs of internal gear pairs are required to be arranged in the NN type planetary gear transmission, so that the number of parts of the speed reducer is increased, the structure tends to be complex, the overall output efficiency of the speed reducer is reduced, the size and the weight of the speed reducer are increased, and the production and assembly are not facilitated.

Disclosure of Invention

Aiming at the problems, the invention provides a planetary gear transmission structure with small tooth difference, which can simplify the structure of the whole machine, reduce the number of parts and improve the transmission efficiency of the whole machine of a speed reducer, not only can reduce the cost, but also can be convenient to process and assemble.

In order to achieve the purpose, the small-tooth-difference planetary gear transmission structure comprises a box body, an eccentric input shaft sleeve, an external gear, a crankshaft and an internal ring gear frame;

the box body is of a cylindrical structure with a cylindrical inner cavity, and the left end and the right end of the cylindrical structure comprise a left end cover and a right end cover which are fixedly installed and connected;

the inner gear ring frame is coaxially arranged with the cylindrical structure of the box body, and comprises an inner gear ring, a frame body and an output shaft which are coaxially arranged from left to right in sequence; the outer surface of the inner gear ring along the radial direction of the inner gear ring is erected and installed on the inner surface of the cylindrical structure of the box body through a second bearing, and a tooth part structure is arranged on the inner surface of the inner gear ring along the radial direction of the inner gear ring; the frame body is erected and installed on the right end cover through a bearing III;

the eccentric input shaft sleeve comprises a shaft sleeve part and an eccentric bulge part arranged on the shaft sleeve part, the axial lead of the eccentric bulge part is parallel to the axial lead of the shaft sleeve part, the left end of the shaft sleeve part is erected and mounted on the left end cover through a bearing I, the right end of the shaft sleeve part is erected and mounted on the frame body through a bearing IV, and the shaft sleeve part is coaxially connected with the power input shaft in a sleeved mode;

the position of the external gear corresponding to the inner gear ring is coaxially erected and installed on an eccentric bulge part of the eccentric input shaft sleeve through a rotating arm bearing, and the external gear is in meshed fit connection with the inner gear ring;

the crankshaft is uniformly distributed into a plurality of parts along the circumferential direction of the outer gear, and two ends of the crankshaft are respectively erected and installed on the end surfaces of the left end cover and the outer gear through crankshaft bearings.

As a further improvement of the invention, the crankshaft comprises a left large-diameter section and a right small-diameter section which are eccentrically arranged, the left large-diameter section is erected and installed on the left end cover through a crankshaft bearing I, and the right small-diameter section is erected and installed on the end face of the external gear through a crankshaft bearing II.

As a further development of the invention, the pivot arm bearing is arranged in two rows in the left-right direction.

As an embodiment of the invention, the shaft sleeve part of the eccentric input shaft sleeve is connected with the power input shaft in a mounting mode through a flat key structure.

Compared with the prior art, the small-tooth-difference planetary gear transmission structure adopts the mode that the power is directly output through the output shaft of the inner gear ring carrier, and an additional power output mechanism is not arranged, so that the transmission efficiency, the stability and the transmission precision of the whole speed reducer can be improved; the internal structure is simplified, the structure of the whole machine is simple, the design and calculation are convenient, meanwhile, the number of internal parts is small, the production and assembly of the speed reducer are convenient, and the production cost is reduced; the tumbler bearing with a double-row structure ensures the stability of eccentric movement and the service life of the tumbler bearing; the crankshaft is used for decomposing the transmission force of the tumbler bearing, so that the eccentric input shaft sleeve and the tumbler bearing are in a better stress state, and further, the transmission of larger power can be realized.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: 1. the device comprises a box body 11, a left end cover 12, a right end cover 13, a second bearing, a third bearing, a 15 bearing, a first bearing, a second bearing, a 2 eccentric input shaft sleeve 21, a fourth bearing, a 3 bearing, an external gear 31, a rocker arm bearing 4, a crankshaft 41, a first crankshaft bearing 42, a second crankshaft bearing 5, an internal gear ring frame 51, an internal gear ring 52, a frame body 53 and an output shaft.

Detailed Description

The present invention will be further explained with reference to the drawings (hereinafter, the right side direction of fig. 1 will be described as the right direction).

As shown in fig. 1, the present small tooth difference planetary gear transmission structure includes a case 1, an eccentric input sleeve 2, an external gear 3, a crankshaft 4, and an internal ring gear 5.

The box body 1 is a cylindrical structure with a cylindrical inner cavity, and the left end and the right end of the cylindrical structure comprise a left end cover 11 and a right end cover 12 which are fixedly installed and connected through box cover screws.

The inner ring gear frame 5 is coaxially arranged with the cylindrical structure of the box body 1, and the inner ring gear frame 5 comprises an inner ring gear 51, a frame body 52 and an output shaft 53 which are coaxially arranged from left to right in sequence; the outer surface of the inner gear ring 51 along the radial direction is mounted on the inner surface of the cylindrical structure of the box body 1 in an erecting mode through a bearing II 13, and the inner surface of the inner gear ring 51 along the radial direction is provided with a tooth structure; the frame body 52 is mounted on the right end cover 12 by a bearing three 14.

The eccentric input shaft sleeve 2 comprises a shaft sleeve part and an eccentric bulge part arranged on the shaft sleeve part, the axial lead of the eccentric bulge part is parallel to the axial lead of the shaft sleeve part, the left end of the shaft sleeve part is mounted on the left end cover 11 in an erected mode through a bearing I15, the right end of the shaft sleeve part is mounted on the frame body 52 in an erected mode through a bearing II 21, and the shaft sleeve part is coaxially sleeved with the power input shaft and is mounted and connected through a flat key or a spline structure.

The position of the external gear 3 corresponding to the internal gear 51 is coaxially mounted on the eccentric convex part of the eccentric input shaft sleeve 2 through the tumbler bearing 31 in an erecting way, the external gear 3 is in meshed fit connection with the internal gear 51, and the tumbler bearing 31 can be arranged in double rows to ensure the stability of eccentric movement and the service life of the tumbler bearing 31.

The crankshaft 4 is uniformly distributed into a plurality of parts along the circumferential direction of the outer gear 3, the crankshaft 4 comprises a left large-diameter section and a right small-diameter section which are eccentrically arranged, the left large-diameter section is mounted on the left end cover 11 in an erected mode through a crankshaft bearing I41, and the right small-diameter section is mounted on the end face of the outer gear 3 in an erected mode through a crankshaft bearing II 42.

When the planetary gear transmission structure with small tooth difference is used, after a motor is started, a power input shaft connected with an eccentric input shaft sleeve 2 drives the eccentric input shaft sleeve 2 to rotate, the eccentric input shaft sleeve 2 transmits power and motion to an external gear 3 through a tumbler bearing 31, because the external gear 3 and a left end cover 11 are respectively connected with a crankshaft 4 through a crankshaft bearing I41 and a crankshaft bearing II 42, under the eccentric rotation action of the eccentric input shaft sleeve 2, the external gear 3 can only do forced plane swing in two vertical directions of an X axis and a Y axis of the plane of the end surface of the external gear 3, because the external gear 3 and an inner gear ring 51 are always engaged with teeth and exist a certain gear engaging gap, and an inner gear ring frame 5 is respectively connected with the inner surface of a cylindrical structure of a box body 1 and a right end cover 12 through a bearing II 13 and a bearing III 14, the inner gear ring frame 5 can only do self rotary motion, thereby realizing the reduction of the rotational motion of the power input shaft into the rotational motion of the output shaft 53, and completing the whole transmission process of the power. The crankshaft 4 is arranged to limit the rotation of the external gear 3, ensure the external gear 3 to swing according to a preset track, and ensure the stress balance and stability of the external gear 3. Through carrying out atress analysis and structural dimension design to external gear 3, can rationally set up the quantity of bent axle 4 and the diameter of distribution circumference, and then realize better stress balance nature and the stability of external gear 3.