CN210265711U

CN210265711U - Cycloidal gear speed reducer

Info

Publication number: CN210265711U
Application number: CN201921162713.2U
Authority: CN
Inventors: 陈涵
Original assignee: Wenzhou Rikang Smoking Set Factory
Current assignee: Wenzhou RIKANG Machinery Technology Factory
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-04-07
Anticipated expiration: 2029-07-23

Abstract

A cycloidal gear speed reducer. The method is characterized in that: the outer circumference of the cycloidal gear is provided with a plurality of cycloidal bearings which are uniformly distributed in the circumferential direction, a cycloidal gear profile curve which is in an arc tooth shape is formed on the inner wall of the shell at a position corresponding to the cycloidal bearings, and the cycloidal bearings are attached to the cycloidal gear profile curve to form rolling fit. The cycloidal gear has the advantages that by adopting the scheme, the structure of the bearing is adopted to realize the matching between the cycloidal gear and the shell, the existing sliding matching is changed into rolling matching, and the friction is greatly reduced, so that the transmission efficiency is improved, the abrasion is reduced, and the service life is prolonged; meanwhile, the cycloid bearing is arranged on the cycloid wheel, the inner wall of the shell correspondingly forms a cycloid contour, and compared with the existing structure that the needle teeth are arranged on the needle tooth shell and the outline of the cycloid wheel forms a cycloid contour curve, under the same size requirement, the force arm is longer, so that the point stress is reduced, the transmission efficiency is further improved, and the use performance of the cycloid wheel speed reducer is improved.

Description

Cycloidal gear speed reducer

Technical Field

The utility model relates to a reduction gear, concretely relates to cycloid wheel reduction gear.

Background

With the development of industrial technology, the requirements of factory automation and intellectualization on the performance of mechanical equipment transmission are higher and higher. The development trend of the speed reducer is towards the development of high precision, light weight, high bearing capacity and miniaturization. At present, the types of the speed reducers on the market are various, and common planetary speed reducers, gear speed reducers, cycloid pin wheel speed reducers and the like are available. The cycloidal pin gear speed reducer is a novel structure, is a planetary gear transmission device with small tooth difference, is engaged by a plurality of teeth simultaneously, has the advantages of higher transmission capacity, compact structure, small volume, light weight, high efficiency and the like, and is widely applied to the industries of mines, metallurgy, chemical industry, national defense, hoisting transportation and the like.

At present, most cycloidal pin gear speed reducers have the following structures: the input shaft is connected with the motor to drive the whole speed reducer to operate. The input shaft rotates centrifugally at a high speed to drive the cycloidal gears to rotate, the two cycloidal gears are arranged eccentrically by 180 degrees and are meshed with the needle teeth through the rolling needles, so that speed reduction transmission is realized, and the motion is transmitted out through the output disc.

How to further achieve high precision, light weight, high bearing capacity and miniaturization of the cycloidal gear speed reducer is a direction which needs to be researched by technicians in the field.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of background art, the utility model provides a cycloid wheel reduction gear of brand-new structure makes its precision higher, bearing capacity stronger.

The utility model discloses the technical scheme who adopts: a cycloidal gear speed reducer comprises a shell, an eccentric shaft, an output shaft and two cycloidal gears, wherein the two cycloidal gears are arranged on the eccentric shaft and are arranged eccentrically by 180 degrees, a plurality of pin shaft holes distributed circumferentially are formed in the cycloidal gears, a plurality of pin shafts are correspondingly arranged on the output shaft, the pin shafts penetrate through the pin shaft holes of the two cycloidal gears, the pin shafts and the pin shaft holes are arranged eccentrically, and the outer walls of the pin shafts are attached to the inner walls of the pin shaft holes; the outer circumference of the cycloidal gear is provided with a plurality of cycloidal bearings which are uniformly distributed in the circumferential direction, a cycloidal gear profile curve which is in an arc tooth shape is formed on the inner wall of the shell at a position corresponding to the cycloidal bearings, and the cycloidal bearings are attached to the cycloidal gear profile curve to form rolling fit.

Still include the rotating circular disk, the rotating circular disk can rotatably set up in the shell, and with the end connection of round pin axle.

The eccentric shaft is characterized in that a first bearing is arranged between the eccentric shaft and the inner wall of the shell, a first limiting step is formed on the inner wall of the shell, an outer ring of the first bearing is placed on the first limiting step to be in limiting fit with the first limiting step, and a first limiting boss is formed on an outer ring of the eccentric shaft and is placed on an inner ring of the first bearing to be in limiting fit with the first limiting boss.

The rotary disc is characterized in that a second bearing is arranged between the rotary disc and the inner wall of the shell, a second limiting step is formed on the inner wall of the shell, an outer ring of the second bearing is placed on the second limiting step and is in limiting fit with the second limiting step, a second limiting boss is formed on the outer ring of the rotary disc and is placed on an inner ring of the second bearing and is in limiting fit with the second limiting step, and the inner diameter of the second limiting step is larger than that of the first limiting step.

And a third bearing is arranged between the eccentric shaft and the cycloidal gear, a third limiting step is formed on the outer wall of the eccentric shaft, an inner ring of the third bearing is placed on the third limiting step and is in limiting fit with the third limiting step, and a third limiting boss is formed on the inner wall of the cycloidal gear and is placed on an outer ring of the third bearing and is in limiting fit with the third limiting boss.

The end part of the output shaft is provided with a positioning counter bore, the eccentric shaft extends into the positioning counter bore, a fourth bearing is arranged between the eccentric shaft and the inner wall of the positioning counter bore, the end part of the eccentric shaft extending into the positioning counter bore is provided with a fourth limiting step, the inner ring of the fourth bearing is placed on the fourth limiting step and is in limiting fit with the fourth limiting step, and the inner wall of the positioning counter bore is provided with a fourth limiting boss and is placed on the outer ring of the fourth limiting step and is in limiting fit with the fourth limiting step.

The bearing is characterized in that a fifth bearing is arranged between the output shaft and the inner wall of the shell, a fifth limiting step is further formed on the outer wall of the output shaft, an inner ring of the fifth bearing is placed on the fifth limiting step and is in limiting fit with the fifth limiting step, and a gland fixedly connected with the shell is further arranged at the upper end of the fifth limiting step.

The gland is matched with the shell through threads.

And a sixth bearing matched with the pin shaft is also arranged in the pin shaft hole.

The outer ring of the cycloid wheel is arc-shaped and toothed, an annular groove is formed in the middle of the outer wall of the cycloid wheel, the cycloid bearing is installed in the annular groove, and an arc-shaped groove matched with the cycloid bearing is formed in the inner wall of the annular groove at a position corresponding to the position of the cycloid bearing.

The utility model has the advantages that: by adopting the scheme, the structure of the bearing is adopted to realize the matching between the cycloid wheel and the shell, the existing sliding matching is changed into rolling matching, and the friction is greatly reduced, so that the transmission efficiency is improved, the abrasion is reduced, and the service life is prolonged; meanwhile, the cycloid bearing is arranged on the cycloid wheel, the inner wall of the shell correspondingly forms a cycloid contour, and compared with the existing structure that the needle teeth are arranged on the needle tooth shell and the outline of the cycloid wheel forms a cycloid contour curve, under the same size requirement, the force arm is longer, so that the point stress is reduced, the transmission efficiency is further improved, and the use performance of the cycloid wheel speed reducer is improved.

Drawings

Fig. 1 is a schematic structural view of a cycloid gear speed reducer with a motor according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the cycloidal gear speed reducer according to the embodiment of the present invention.

Fig. 3 is a longitudinal sectional view of the cycloidal gear speed reducer according to the embodiment of the present invention.

Fig. 4 is a transverse sectional view of the cycloidal gear speed reducer according to the embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a housing according to an embodiment of the present invention.

Fig. 6 is a schematic structural view of an eccentric shaft according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of the output shaft with the pin and the rotating disk according to the embodiment of the present invention.

Fig. 8 is a schematic structural view of a cycloid wheel according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be further explained with reference to the accompanying drawings:

as shown in the figure, a cycloidal gear speed reducer comprises a shell 1, an eccentric shaft 2, an output shaft 3 and two cycloidal gears 4.

The eccentric shaft 2 is rotatably installed in the housing 1, one end of the eccentric shaft is connected with an output shaft of the motor, the other end of the eccentric shaft is provided with two eccentric wheel parts 21, and the two eccentric wheel parts 21 are arranged in a way of being opposite to each other and eccentric by 180 degrees.

The two cycloidal gears 4 are respectively installed on two eccentric wheel parts 21 of the eccentric shaft 2, a plurality of pin shaft holes 41 which are distributed in the circumferential direction are formed in the cycloidal gears 4, a plurality of cycloidal bearings 6 which are uniformly distributed in the circumferential direction are arranged on the outer circumference of each cycloidal gear 4, a cycloidal gear profile curve 101 which is in the shape of an arc tooth is formed in the position, corresponding to the cycloidal bearings 6, of the inner wall of the shell 1, and the cycloidal bearings 6 are attached to the cycloidal gear profile curve 101 to form rolling fit.

The output shaft 3 is rotatably arranged in the shell 1, a plurality of pin shafts 5 corresponding to the pin shaft holes 41 are arranged on the output shaft 3, the pin shafts 5 penetrate through the pin shaft holes 41 of the two cycloidal gears 4, the pin shafts 5 and the pin shaft holes 41 are eccentrically arranged, and the outer walls of the pin shafts 5 are attached to the inner walls of the pin shaft holes 41.

During operation, the motor drives the eccentric shaft 2 to rotate, the eccentric shaft 2 drives the two cycloidal gears 4 to revolve, the two cycloidal gears 4 are matched with the cycloidal profile curve 101 through the cycloidal bearing 6 to form reverse thrust, and further form moment opposite to the revolution direction of the cycloidal gears 4 to push the two cycloidal gears 4 to reversely rotate, the two cycloidal gears 4 are mutually offset by 180 degrees and drive the output shaft 3 to do fixed-axis rotation output through the eccentrically arranged pin shaft hole 41 and the pin shaft 5, and the rotating speed is consistent with the rotating speed of the cycloidal gears 4, so that the speed reduction function is realized.

In the cycloid gear speed reducer, the structure of the bearing is adopted to realize the matching between the cycloid gear 4 and the shell 1, the existing sliding matching is changed into rolling matching, and the friction is greatly reduced, so that the transmission efficiency is improved, the abrasion is reduced, and the service life is prolonged. Meanwhile, the cycloid bearing 6 is arranged on the cycloid wheel 4, the inner wall of the shell 1 correspondingly forms a cycloid outline, and compared with the existing structure that the needle teeth are arranged on the needle tooth shell and the outline of the cycloid wheel forms a cycloid outline curve, under the same size requirement, the force arm is longer, so that the point stress is reduced, the transmission efficiency is further improved, and the use performance of the cycloid wheel speed reducer is improved.

As shown in the figure, still include rotating circular disk 7, rotating circular disk 7 rotatably sets up in shell 1, and with the end connection of round pin axle 5 for round pin axle 5 both ends all receive the injecing, when cycloid wheel 4 drives output shaft 3 rotatory output through round pin axle 5, work is more reliable and more stable.

In order to further ensure the transmission performance of the cycloidal gear reducer and reduce abrasion, a first bearing 8 is arranged between the eccentric shaft 2 and the inner wall of the shell 1, a second bearing 9 is arranged between the rotating disc 7 and the inner wall of the shell 1, a third bearing 10 is arranged between the eccentric shaft 2 and the cycloidal gear 4, a positioning counter bore 31 is formed at the end part of the output shaft 3, the eccentric shaft 2 extends into the positioning counter bore 31, a fourth bearing 11 is arranged between the eccentric shaft 2 and the inner wall of the positioning counter bore 31, a fifth bearing 12 is arranged between the output shaft 3 and the inner wall of the shell 1, and a sixth bearing 13 matched with the pin shaft 5 is further arranged in the pin shaft hole 41.

At each movable fit junction, all set up the structure of bearing, the wearing and tearing that the transmission cooperation that will significantly reduce brought guarantee high transmission efficiency, guarantee high life.

As shown in the figure, the inner wall of the housing 1 is formed with a first limit step 102, the outer ring of the first bearing 8 is placed on the first limit step 102 and is in limit fit with the first limit step 102, and the outer ring of the eccentric shaft 2 is formed with a first limit boss 22 and is placed on the inner ring of the first bearing 8 and is in limit fit with the first limit boss.

A second limiting step 103 is formed on the inner wall of the housing 1, the outer ring of the second bearing 9 is placed on the second limiting step 103 and is in limiting fit with the second limiting step 103, a second limiting boss 71 is formed on the outer ring of the rotating disc 7 and is placed on the inner ring of the second bearing 9 and is in limiting fit with the second limiting boss, and the inner diameter of the second limiting step 103 is larger than that of the first limiting step 102.

The outer wall of the eccentric shaft 2 is provided with a third limiting step 23, the inner ring of the third bearing 10 is placed on the third limiting step 23 and is in limiting fit with the third limiting step 23, the inner wall of the cycloid wheel 4 is provided with a third limiting boss 42 and is placed on the outer ring of the third bearing 10 and is in limiting fit with the third limiting step, and certainly, for convenience of installation, the inner diameter sizes of the two cycloid wheels 4 are different, and the sizes of the two corresponding cycloid wheels, such as the two eccentric wheel portions 21, the third limiting step 23 and the third bearing 10, on the eccentric shaft 2 are also different correspondingly.

The end part of the eccentric shaft 2 extending into the positioning counter bore 31 is formed with a fourth limiting step 24, the inner ring of the fourth bearing 11 is placed on the fourth limiting step 24 and is in limiting fit with the fourth limiting step 24, and the inner wall of the positioning counter bore 31 is formed with a fourth limiting boss 32 and is placed on the outer ring of the fourth limiting step 24 and is in limiting fit with the fourth limiting step.

A fifth limiting step 25 is further formed on the outer wall of the output shaft 3, an inner ring of the fifth bearing 12 is placed on the fifth limiting step 25 and is in limiting fit with the fifth limiting step 25, and a gland 14 fixedly connected with the shell 1 is further arranged at the upper end of the fifth limiting step 25.

When the cycloidal gear speed reducer is installed, the first bearing 8, the eccentric shaft 2, the second bearing 9, the rotating disc 7, the third bearing 10, the cycloidal gear 4, the fourth bearing 11, the output shaft 3 and the fifth bearing 12 are sequentially placed into the shell 1, the gland 13 is covered and fixed, the cycloidal gear speed reducer is simple in structure, convenient to assemble and assemble, stable and reliable in structure, and parts are in mutual limit fit.

Furthermore, the gland 14 is matched with the shell 1 through threads, so that the assembly is further facilitated.

In addition, the outer ring of the cycloid gear 4 is arc-shaped and toothed, the middle part of the outer wall of the cycloid gear is provided with an annular groove 43, the cycloid bearing 6 is installed in the annular groove 43, and an arc-shaped groove 44 matched with the inner wall of the annular groove 43 is formed at the position corresponding to the cycloid bearing 6, so that the cycloid bearing 6 is installed more firmly and reliably, the overall installation space is reduced, and the structural compactness is further ensured.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.

Claims

1. A cycloidal gear speed reducer comprises a shell (1), an eccentric shaft (2), an output shaft (3) and two cycloidal gears (4), wherein the two cycloidal gears (4) are installed on the eccentric shaft (2) and are arranged eccentrically by 180 degrees, a plurality of pin shaft holes (41) distributed circumferentially are formed in the cycloidal gears (4), a plurality of pin shafts (5) are correspondingly arranged on the output shaft (3), the pin shafts (5) penetrate through the pin shaft holes (41) of the two cycloidal gears (4), the pin shafts (5) and the pin shaft holes (41) are eccentrically arranged, and the outer walls of the pin shafts (5) are attached to the inner walls of the pin shaft holes (41);

the method is characterized in that: the outer circumference of the cycloidal gear (4) is provided with a plurality of cycloidal bearings (6) which are uniformly distributed in the circumferential direction, a cycloidal gear outline curve (101) which is in the shape of a circular arc tooth is formed on the inner wall of the shell (1) corresponding to the position of the cycloidal bearing (6), and the cycloidal bearings (6) are attached to the cycloidal gear outline curve (101) to form rolling fit.

2. The cycloidal gear reducer of claim 1 wherein: the rotary disc type motor is characterized by further comprising a rotary disc (7), wherein the rotary disc is rotatably arranged in the shell (1) and is connected with the end portion of the pin shaft (5).

3. The cycloidal gear reducer of claim 2 wherein: a first bearing (8) is arranged between the eccentric shaft (2) and the inner wall of the shell (1), a first limiting step (102) is formed on the inner wall of the shell (1), the outer ring of the first bearing (8) is placed on the first limiting step (102) to be in limiting fit with the first limiting step, and a first limiting boss (22) is formed on the outer ring of the eccentric shaft (2) and is placed on the inner ring of the first bearing (8) to be in limiting fit with the first limiting step.

4. The cycloidal gear reducer of claim 3 wherein: be equipped with second bearing (9) between rotating disc (7) and shell (1) inner wall, shell (1) inner wall is formed with second spacing step (103), the outer loop of second bearing (9) is placed on second spacing step (103) rather than spacing cooperation, rotating disc (7) outer lane is formed with second spacing boss (71) to place on the inner ring of second bearing (9) rather than spacing cooperation, just the internal diameter of second spacing step (103) is greater than first spacing step (102).

5. The cycloidal gear reducer of claim 4 wherein: a third bearing (10) is arranged between the eccentric shaft (2) and the cycloidal gear (4), a third limiting step (23) is formed on the outer wall of the eccentric shaft (2), an inner ring of the third bearing (10) is placed on the third limiting step (23) and is in limiting fit with the third limiting step, and a third limiting boss (42) is formed on the inner wall of the cycloidal gear (4) and is placed on an outer ring of the third bearing (10) and is in limiting fit with the third limiting step.

6. The cycloidal gear reducer of claim 4 wherein: the end part of the output shaft (3) is provided with a positioning counter bore (31), the eccentric shaft (2) extends into the positioning counter bore (31), a fourth bearing (11) is arranged between the eccentric shaft (2) and the inner wall of the positioning counter bore (31), a fourth limiting step (24) is formed at the end part of the eccentric shaft (2) extending into the positioning counter bore (31), an inner ring of the fourth bearing (11) is placed on the fourth limiting step (24) and is in limiting fit with the fourth limiting step, and a fourth limiting boss (32) is formed on the inner wall of the positioning counter bore (31) and is placed on an outer ring of the fourth limiting step (24) and is in limiting fit with the fourth limiting step.

7. The cycloidal gear reducer of claim 6 wherein: be equipped with fifth bearing (12) between output shaft (3) and shell (1) inner wall, output shaft (3) outer wall still is formed with fifth spacing step (25), the inner ring of fifth bearing (12) is placed at fifth spacing step (25) and is rather than spacing cooperation, fifth spacing step (25) upper end still is equipped with gland (14) with shell (1) fixed connection.

8. The cycloidal gear reducer of claim 7 including: the gland (14) is matched with the shell (1) through threads.

9. The cycloidal gear reducer of claim 1 wherein: and a sixth bearing (13) matched with the pin shaft (5) is also arranged in the pin shaft hole (41).

10. The cycloidal gear reducer of claim 1 wherein: the outer ring of the cycloidal gear (4) is in the shape of an arc tooth, an annular groove (43) is formed in the middle of the outer wall of the cycloidal gear, the cycloidal bearing (6) is installed in the annular groove (43), and an arc-shaped groove (44) matched with the annular groove is formed in the inner wall of the annular groove (43) corresponding to the position of the cycloidal bearing (6).