CN217502466U

CN217502466U - Planetary gear speed reducer

Info

Publication number: CN217502466U
Application number: CN202221797765.9U
Authority: CN
Inventors: 姚文龙; 关放柳
Original assignee: Zhejiang Sankai Mechanical And Electrical Co ltd
Current assignee: Zhejiang Sankai Mechanical And Electrical Co ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2022-09-27
Anticipated expiration: 2032-07-12

Abstract

The utility model provides a planetary gear speed reducer belongs to mechanical technical field. It has solved the problem of current speed reducer processing difficulty. The planetary gear reducer comprises a box body, an output shaft and a planet carrier, wherein the output shaft and the planet carrier are both rotatably arranged in the box body; the two eccentric sleeves are matched with the rotating shaft through a flat key, and the rotating shaft is provided with a limiting structure for simultaneously limiting the two eccentric sleeves in the axial direction; the two eccentric sleeves are all provided with gears through one rotation of the bearing, the two gears are respectively meshed with the upper side and the lower side of the gear ring, the two gears are fixedly connected through a circle of roller pins, a supporting seat is circumferentially fixed to one end, close to the planet carrier, of the output shaft, and one end, far away from the planet carrier, of each roller pin is fixed to the supporting seat. The planetary gear reducer is low in processing difficulty.

Description

Planetary gear speed reducer

Technical Field

The utility model belongs to the technical field of machinery, a speed reducer, especially a planetary gear speed reducer are related to.

Background

The existing precision planetary gear reducer has part of application working conditions which require the precision planetary gear reducer to realize large speed ratio output and shorten the length of the reducer, and meanwhile, the transmission precision is ensured. The single-stage reduction ratio of a conventional planetary reducer is generally 1:10 at most, a larger reduction ratio needs to be realized by increasing the number of transmission stages, so the length is increased, and each stage of transmission is provided with 3 planet wheels and 1 sun wheel, so the cost is increased, and for this reason, a planetary gear reducer with small tooth difference is invented.

The existing planetary gear reducer with small tooth difference is like a planetary gear reducer with small tooth difference (application number: 201310152648.6) disclosed in Chinese patent library, and comprises a rack and a power input shaft, wherein the power input shaft is rotatably arranged on the rack through a first bearing, two eccentric shaft sections in opposite directions are fixedly arranged on the input shaft, gears are respectively arranged on the two eccentric shaft sections through second bearings, the two gears are same in shape, the outer parts of the two gears are respectively meshed with an inner gear, the meshing parts of the two gears and the inner gear are positioned on two opposite side surfaces of an inner gear, a plurality of through holes are uniformly distributed on the periphery of the two gears, a positioning pin is arranged in each through hole, the positioning pin is fixedly arranged on the rack, a sliding pin sleeve is sleeved on the positioning pin, and the positioning pin forms a rotating fit with the through holes of the gears through holes through the sliding pin sleeve.

In the speed reducer, the power input shaft is of an integrated structure, and two eccentric shaft sections with opposite directions are formed at two ends of the same power input shaft, so that the processing difficulty is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a planetary gear speed reducer, the technical problem of solution is how to reduce the processing degree of difficulty.

The purpose of the utility model can be realized by the following technical proposal: the planetary gear reducer is characterized in that two eccentric sleeves are sleeved on the rotating shaft and axially distributed along the rotating shaft, and the central axes of the two eccentric sleeves are respectively positioned at the upper side and the lower side of the central axis of the rotating shaft; the two eccentric sleeves are rotationally matched with the rotating shaft through a flat key, and the rotating shaft is provided with a limiting structure which can limit the two eccentric sleeves in the axial direction; a gear is rotatably arranged outside each of the two eccentric sleeves through a bearing, the two gears are respectively meshed with the upper side and the lower side of the gear ring, the two gears are fixedly connected through a circle of roller pins uniformly distributed along the circumferential direction of the rotating shaft, and the axes of the roller pins and the rotating shaft are arranged in parallel; the supporting seat is circumferentially fixed at one end, close to the planet carrier, of the output shaft, and one end, far away from the planet carrier, of the rolling needle is fixed on the supporting seat.

The eccentric sleeves with two same structures are sleeved on the rotating shaft, the input shaft structure in the prior art is realized by changing the installation directions of the two eccentric sleeves, the split type structure of the input shaft is formed by the eccentric sleeves and the rotating shaft, the eccentric sleeves and the rotating shaft are independently machined, and the machining difficulty is effectively reduced.

In the planetary gear reducer, the limiting structure comprises a first ring body and a second ring body which are sleeved on the rotating shaft, the second ring body is fixedly connected with the rotating shaft, two adjacent ends of the two eccentric sleeves are tightly pressed on the first ring body, and two ends, far away from each other, of the two eccentric sleeves are tightly pressed on the planet carrier and the second ring body respectively. Only set up ring body one and ring body two alright two eccentric sleeves of synchronous positioning, not only can further reduce the processing degree of difficulty, the structure is also comparatively simple moreover.

As another scheme, in the above planetary gear reducer, the rotating shaft and the planet carrier are of a split structure, the limiting structure includes an annular seat integrally formed on the rotating shaft and a limiting ring sleeved on and fixed on the rotating shaft, two adjacent ends of the two eccentric sleeves are both pressed tightly on the annular seat, and two ends of the two eccentric sleeves away from each other are respectively pressed tightly on the planet carrier and the limiting ring.

In the planetary gear reducer, the output shaft is hollow, the rotating shaft extends into the output shaft, the second rotating shaft is rotatably supported on the output shaft through the second bearing, and at least two of the second bearings are axially distributed along the rotating shaft. In the actual product, the planet carrier is rotatably supported in the box body through the matching of the rotating shaft and the output shaft, so that the distance between each part can be effectively reduced, the whole structure becomes compact, and the occupied space is reduced.

In foretell planetary gear reducer, the output shaft has seted up annular step on being close to the tip inner wall of planet carrier, and annular step comprises annular lateral wall and annular diapire, and the inner circle and the outer lane of this bearing two that are close to the planet carrier setting are sticis respectively on ring body two and annular diapire, and in this application promptly, ring body two is used for spacing eccentric bushing of axial and bearing two simultaneously to further simplify the structure, convenient equipment.

In foretell planetary gear reducer, the supporting seat is cyclic annularly and overlaps and establish outside the output shaft, and supporting seat and output shaft pass through parallel key or splined connection, realizes under supporting seat and the fixed prerequisite of output shaft circumference, makes both connections again and need not be with the help of other spare parts, reaches the effect of further simplifying the structure.

In the planetary gear reducer, the two gears are respectively provided with a round hole which is axially penetrated and provided for the roller pin to penetrate through, the aperture of the round hole is larger than the outer diameter of the roller pin, the number of the round holes on each gear is the same as that of the roller pin, the positions of the round holes are in one-to-one correspondence, and each round hole is provided with a section of inner wall which is in close contact with the side wall of the roller pin so as to stably connect the two gears in series and improve the working and structural stability.

In the planetary gear reducer, the supporting seat is provided with the jacks which are arranged in a penetrating manner along the axial direction of the rolling needles, the jacks and the rolling needles are the same in number and are in one-to-one correspondence in position, and one ends of the rolling needles are inserted and embedded in the corresponding jacks, so that the planetary gear reducer has the advantages of simple structure and convenience in assembly.

In foretell planetary gear reducer, the output shaft both ends all rotate through three bearings and support in the box, all overlap on every kingpin and establish and be fixed with the clamping ring, and the clamping ring sticiss on one of them terminal surface of supporting seat, and another terminal surface of supporting seat sticiss on three inner races of bearing to further strengthen supporting seat location effect, improve job stabilization nature.

In the planetary gear reducer described above, the number of teeth is smaller than that of the ring gear, so that the reduction ratio is further increased.

Compared with the prior art, the planetary gear speed reducer has the following advantages:

1. the eccentric sleeves with two same structures are sleeved on the rotating shaft, and the input shaft structure in the prior art is realized by changing the installation directions of the two eccentric sleeves, so that the input shaft is split into a split structure consisting of the eccentric sleeves and the rotating shaft, the eccentric sleeves and the rotating shaft are independently processed, and the processing difficulty is effectively reduced.

2. Only the first ring body and the second ring body are arranged, so that the two eccentric sleeves can be synchronously positioned, the processing difficulty can be further reduced, and the structure is simpler.

3. In this application, ring body two is used for spacing eccentric bushing and bearing two axially simultaneously to further simplify the structure, convenient equipment.

Drawings

Fig. 1 is a schematic structural view of a planetary gear reducer.

Fig. 2 is an enlarged schematic view of a structure in fig. 1.

Fig. 3 is a schematic view showing the connection of the needle roller and the corresponding two circular holes.

Fig. 4 is a schematic view showing a state in which a gear connected to an eccentric sleeve at a low position is engaged with a ring gear.

Fig. 5 is a schematic view showing the meshing state of the gear connected to the eccentric sleeve at a high position and the ring gear.

In the figure, 1, a box body; 1a, a gear ring; 2. an input shaft; 3. an output shaft; 3a, an annular step; 4. a sun gear; 5. a planet carrier; 5a, a rotating shaft; 6. a planet wheel; 7. a second bearing; 8. an eccentric sleeve; 9. a first bearing; 10. a gear; 10a, a round hole; 11. rolling needles; 12. a supporting seat; 13. a ring body I; 14. a second ring body; 15. a third bearing; 16. and (5) pressing a ring.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1, the planetary gear reducer includes a case 1, and an input shaft 2 and an output shaft 3 both horizontally and rotatably disposed in the case 1, and the input shaft 2 and the output shaft 3 are coaxially arranged.

In particular, in the case of a system,

a planetary reduction mechanism is arranged between the input shaft 2 and the output shaft 3, and the planetary reduction mechanism is in the prior art and comprises a sun gear 4 fixed on the input shaft 2, a gear ring 1a formed in the box body 1 and a planet carrier 5 rotatably arranged in the box body 1. Wherein the planet carrier 5 is arranged between the input shaft 2 and the output shaft 3; be equipped with the planet wheel 6 of 2 circumference equipartitions of round edge input shaft between sun gear 4 and the ring gear 1a, planet wheel 6 all meshes with sun gear 4 and ring gear 1a, and planet wheel 6 is connected with planet carrier 5 through the round pin axle, makes input shaft 2 drive planet carrier 5 rotate.

In the present embodiment, the carrier 5 is mounted as follows: the side of the planet carrier 5 close to the output shaft 3 has a rotating shaft 5a coaxial with the output shaft 3, and the rotating shaft 5a and the planet carrier 5 are preferably of an integral structure. The output shaft 3 is hollow, and the rotating shaft 5a extends into the output shaft 3. The rotating shaft 5a is rotatably supported on the output shaft 3 through a second bearing 7, and at least two second bearings 7 are axially distributed along the rotating shaft 5 a. In the actual product, planet carrier 5 rotates through pivot 5a and output shaft 3 cooperation and supports in box 1, can effectively reduce the distance between each spare part, makes the compactness that whole structure becomes, and the reduction space occupies. The number of the second bearing 7 is preferably 2.

As shown in fig. 1, fig. 2, fig. 4 and fig. 5, two eccentric sleeves 8 are sleeved on the rotating shaft 5a, the two eccentric sleeves 8 are distributed along the axial direction of the rotating shaft 5a, and the central axes of the two eccentric sleeves 8 are respectively located at the upper side and the lower side of the central axis of the rotating shaft 5 a. The two eccentric sleeves 8 are in running fit with the rotating shaft 5a through flat keys, and the rotating shaft 5a is provided with a limiting structure which can limit the two eccentric sleeves 8 in the axial direction. The two eccentric sleeves 8 are respectively provided with a gear 10 outside in a rotating way through a bearing I9, the two gears 10 are respectively meshed with the upper side and the lower side of the gear ring 1a, namely, the gear 10 connected with the eccentric sleeve 8 at the high position is meshed with the upper side of the gear ring 1a, and the gear 10 connected with the eccentric sleeve 8 at the low position is meshed with the lower side of the gear ring 1 a. The two gears 10 are fixedly connected through a circle of roller pins 11 uniformly distributed along the circumferential direction of the rotating shaft 5a, and the axes of the roller pins 11 and the rotating shaft 5a are arranged in parallel; one end of the output shaft 3 close to the planet carrier 5 is circumferentially fixed with a support seat 12, and one end of the needle roller 11 far away from the planet carrier 5 is fixed on the support seat 12.

The rotating shaft 5a is sleeved with the two eccentric sleeves 8 with the same structure, and the structure of the input shaft 2 in the prior art is realized by changing the installation direction of the two eccentric sleeves 8, so that the input shaft 2 is split into a split structure consisting of the eccentric sleeves 8 and the rotating shaft 5a, the independent processing of the eccentric sleeves 8 and the rotating shaft 5a is realized, and the processing difficulty is effectively reduced.

In the present embodiment, it is preferred that,

as shown in fig. 2, the limiting structure includes a first ring body 13 and a second ring body 14, which are both sleeved on the rotating shaft 5a, and the second ring body 14 is fixedly connected with the rotating shaft 5a, two adjacent ends of the two eccentric sleeves 8 are both tightly pressed on the first ring body 13, and two ends of the two eccentric sleeves 8, which are far away from each other, are respectively tightly pressed on the planet carrier 5 and the second ring body 14. The two eccentric sleeves 8 can be synchronously positioned only by arranging the first ring body 13 and the second ring body 14, so that the processing difficulty can be further reduced, and the structure is simpler.

Further, an annular step 3a is formed in the inner wall of the end portion, close to the planet carrier 5, of the output shaft 3, the annular step 3a is formed by an annular side wall and an annular bottom wall, and an inner ring and an outer ring of the second bearing 7, close to the planet carrier 5, are respectively and tightly pressed on the second ring body 14 and the annular side wall, that is, in the present application, the second ring body 14 is used for axially limiting the eccentric sleeve 8 and the second bearing 7 at the same time, so that the structure is further simplified, and the assembly is convenient.

As shown in fig. 2 and 3, the needle roller 11 and the gear 10 are mounted as follows: all be equipped with on two gears 10 and be the axial and run through the round hole 10a that sets up and supply kingpin 11 to pass, and the round hole 10a aperture is greater than kingpin 11 external diameter, and the round hole 10a quantity on every gear 10 is the same and the position one-to-one with kingpin 11, all has one section inner wall and kingpin 11 lateral wall in close contact with on every round hole 10a to two gears 10 of stable series connection improve work and structural stability.

The needle roller 11 and the support seat 12 are connected in the following way: be equipped with on the supporting seat 12 along 11 axial penetrations of kingpins jacks that set up, jacks and 11 quantity of kingpins are the same and the position one-to-one, and 11 one end of kingpins are inserted and are inlayed in corresponding jacks, have simple structure, the convenient advantage of equipment. Further, two ends of the output shaft 3 are rotatably supported in the box body 1 through a bearing III 15, a press ring 16 is sleeved and fixed on each needle roller 11, the press ring 16 is tightly pressed on one end face of the supporting seat 12, and the other end face of the supporting seat 12 is tightly pressed on an inner ring of the bearing III 15, so that the positioning effect of the supporting seat 12 is further enhanced, and the working stability is improved.

The support seat 12 and the output shaft 3 are connected in the following way: the supporting seat 12 is annular and is sleeved outside the output shaft 3, and the supporting seat 12 and the output shaft 3 are connected through a flat key or a spline, so that the supporting seat 12 and the output shaft 3 are connected in the circumferential direction without other parts, and the effect of further simplifying the structure is achieved.

In an actual product, the distance between the central axes of the eccentric sleeve 8 and the rotating shaft 5a is 0.5-5.5 mm, so that the reduction ratio of 1: 20-1: 200 is realized. To explain further, the gear 10 has fewer teeth than the ring gear 1a to further enlarge the reduction ratio. In an actual product, the distance between the central axes of the eccentric sleeve 8 and the rotating shaft 5a is 0.85mm, and the number of teeth of the gear 10 is 2 less than that of the gear ring 1a, so that the reduction ratio of 1:50 is realized.

Example two

The structure and principle of the second embodiment are basically the same as those of the first embodiment, and different points are as follows: pivot 5a and planet carrier 5 are split type structure, and limit structure includes that integrated into one piece establishes and fixes the spacing ring on pivot 5a with the cover at the annular seat on pivot 5a, and the both ends that two eccentric sleeves 8 are adjacent all sticiss on the annular seat, and the both ends that two eccentric sleeves 8 kept away from mutually sticiss respectively on planet carrier 5 and spacing ring.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The planetary gear reducer comprises a box body (1), an output shaft (3) and a planet carrier (5) which are both rotatably arranged in the box body (1), wherein the output shaft (3) is horizontally arranged and is positioned on one side of the planet carrier (5), one side of the planet carrier (5) close to the output shaft (3) is provided with a rotating shaft (5a) which is coaxial with the output shaft (3), and a gear ring (1a) is formed in the box body (1), and the planetary gear reducer is characterized in that two eccentric sleeves (8) are sleeved on the rotating shaft (5a), the two eccentric sleeves (8) are axially distributed along the rotating shaft (5a), and the central axes of the two eccentric sleeves (8) are respectively positioned on the upper side and the lower side of the central axis of the rotating shaft (5 a); the two eccentric sleeves (8) are rotationally matched with the rotating shaft (5a) through flat keys, and the rotating shaft (5a) is provided with a limiting structure which can limit the two eccentric sleeves (8) in the axial direction; gears (10) are rotatably arranged outside the two eccentric sleeves (8) through a first bearing (9), the two gears (10) are respectively meshed with the upper side and the lower side of the gear ring (1a), the two gears (10) are fixedly connected through a circle of roller pins (11) which are uniformly distributed along the circumferential direction of the rotating shaft (5a), and the axes of the roller pins (11) and the rotating shaft (5a) are arranged in parallel; one end of the output shaft (3) close to the planet carrier (5) is circumferentially fixed with a supporting seat (12), and one end of the roller pin (11) far away from the planet carrier (5) is fixed on the supporting seat (12).

2. The planetary gear reducer according to claim 1, wherein the limiting structure comprises a first ring body (13) and a second ring body (14) which are both sleeved on the rotating shaft (5a), the second ring body (14) is fixedly connected with the rotating shaft (5a), two adjacent ends of the two eccentric sleeves (8) are both tightly pressed on the first ring body (13), and two ends of the two eccentric sleeves (8) which are far away from each other are respectively tightly pressed on the planet carrier (5) and the second ring body (14).

3. A planetary gear reducer according to claim 1, wherein the rotating shaft (5a) and the planet carrier (5) are of a split structure, the limiting structure comprises an annular seat integrally formed on the rotating shaft (5a) and a limiting ring sleeved on and fixed on the rotating shaft (5a), two adjacent ends of the two eccentric sleeves (8) are respectively pressed on the annular seat, and two ends of the two eccentric sleeves (8) far away from each other are respectively pressed on the planet carrier (5) and the limiting ring.

4. A planetary gear reducer according to claim 2, wherein the output shaft (3) is hollow, the rotating shaft (5a) extends into the output shaft (3), the rotating shaft (5a) is rotatably supported on the output shaft (3) through a second bearing (7), and at least two of the bearings (7) are axially distributed along the rotating shaft (5 a).

5. A planetary gear reducer according to claim 4, wherein the inner wall of the end of the output shaft (3) close to the planet carrier (5) is provided with an annular step (3a), the annular step (3a) is composed of an annular side wall and an annular bottom wall, and the inner ring and the outer ring of the second bearing (7) close to the planet carrier (5) are respectively pressed against the second ring (14) and the annular bottom wall.

6. A planetary gear reducer according to claim 1, wherein the support base (12) is annular and is fitted over the output shaft (3), and the support base (12) and the output shaft (3) are connected by a flat key or a spline.

7. A planetary gear reducer according to claim 6, wherein the two gears (10) are provided with circular holes (10a) axially penetrating through the two gears and allowing the roller pins (11) to pass through, the diameter of each circular hole (10a) is larger than the outer diameter of the roller pin (11), the number of the circular holes (10a) on each gear (10) is the same as that of the roller pins (11), the positions of the circular holes (10a) are in one-to-one correspondence, and each circular hole (10a) is provided with a section of inner wall closely contacting with the side wall of the roller pin (11).

8. A planetary gear reducer according to claim 6 or 7, wherein the support base (12) is provided with insertion holes which are arranged to penetrate through the roller pins (11) in the axial direction, the insertion holes are provided with the same number and the same positions as the roller pins (11), and one end of each roller pin (11) is inserted into the corresponding insertion hole.

9. The planetary gear reducer according to claim 8, wherein both ends of the output shaft (3) are rotatably supported in the housing (1) by a third bearing (15), a pressing ring (16) is sleeved and fixed on each needle roller (11), the pressing ring (16) is tightly pressed on one end face of the support base (12), and the other end face of the support base (12) is tightly pressed on an inner ring of the third bearing (15).

10. A planetary gear reducer according to claim 1, wherein the gear (10) has fewer teeth than the ring gear (1 a).