CN106989143B - Planetary reduction gear - Google Patents
Planetary reduction gear Download PDFInfo
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- CN106989143B CN106989143B CN201710342438.1A CN201710342438A CN106989143B CN 106989143 B CN106989143 B CN 106989143B CN 201710342438 A CN201710342438 A CN 201710342438A CN 106989143 B CN106989143 B CN 106989143B
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- 230000009467 reduction Effects 0.000 title claims abstract description 59
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 49
- 230000007246 mechanism Effects 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 230000007704 transition Effects 0.000 claims description 12
- 230000013011 mating Effects 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
A planetary reduction device, comprising: an inner gear ring having an upstream end and a downstream end disposed along an axis thereof, and inner teeth extending parallel to the axis; an input shaft radially centered along the ring gear axis and axially fixedly and rotatably connected to an upstream end of the ring gear for receiving high-speed rotational movement; an output shaft radially centered along the ring gear axis and axially fixedly and rotatably connected to the downstream end of the ring gear for outputting low-speed rotational motion; at least one stage of planetary reduction mechanism comprising a planetary axle for fitting the planetary wheels; and at least one centering device which is annular and which is arranged radially centrally and axially fixed relative to the ring gear and is in rolling radial contact with one end of the planetary wheel shaft for radial positioning of the planetary reduction mechanism.
Description
Technical Field
The present invention relates to a planetary reduction device, and more particularly, to a planetary reduction device having axial and radial positioning functions.
Background
The planetary reducer is provided with an annular gear or a planet carrier in a floating structure in design, so that an integral component comprising the planet gears and the planet carrier can generate radial floating due to unbalanced stress in use, and therefore, in the operation process, particularly in the initial starting process, extremely uneven static friction force is generated, very obvious noise is generated in the high-speed operation process, friction loss is increased for the planetary reducer, efficiency is reduced, and the service life of main working parts is shortened.
The discussion above is merely provided for general background information and is not intended to be used as an aid in determining the scope of the claimed subject matter.
Disclosure of Invention
The present invention is directed to solving at least one of the above-mentioned problems and disadvantages of the prior art.
In one aspect of the present invention, there is provided a planetary reduction device including: an inner gear ring having an upstream end and a downstream end disposed along an axis thereof, and inner teeth extending parallel to the axis; an input shaft radially centered along the ring gear axis and axially fixedly and rotatably connected to an upstream end of the ring gear for receiving high-speed rotational movement; an output shaft (8) radially centered along the ring gear axis and axially fixedly and rotatably connected to the downstream end of the ring gear for outputting low-speed rotational motion; at least one stage of planetary reduction mechanism comprising a planetary axle for fitting the planetary wheels; and at least one centering device which is annular and which is arranged radially centrally and axially fixed relative to the ring gear and is in rolling radial contact with one end of the planetary wheel shaft for radial positioning of the planetary reduction mechanism.
In one embodiment according to the invention, the input shaft may have an input section, a transition section and an output section in the axial direction, wherein the input section receives a high-speed rotational movement; each stage of planetary reduction mechanism may further include: a sun gear; two or more planetary axles having a length extending in an axial direction and having an upstream section, a midstream section, and a downstream section in the axial direction; two or more planetary gears fitted on the midstream section of the planetary gear shaft and meshed with the sun gear and the internal teeth simultaneously; and a planet carrier having a proximal portion, an intermediate portion and a distal portion in an axial direction, and the proximal portion thereof being secured to a downstream section of the planet axle; the first-stage centering device is axially and fixedly assembled on the transition section of the input shaft, and the second-stage centering device and the upper-stage centering devices are axially and fixedly assembled on the middle part of the planet carrier of the upper stage; the sun gear of the first-stage planetary reduction mechanism is axially fixedly sleeved on the output section of the input shaft, and the second-stage sun gear and the above sun gear are axially fixedly sleeved on the far end part of the planet carrier of the upper stage; the last stage planet carrier is connected to or integrally formed with the output shaft; the upstream segments of the two or more planet axles are disposed circumferentially about and in rolling radial contact with the centering device to achieve radial positioning.
In another embodiment according to the present invention, the outer surfaces of the upstream and downstream sections of the planetary axle may include a first arcuate surface extending in an axial direction and a second planar surface extending in an axial direction, such that the upstream and downstream sections have a "D" shape in cross section; and the cross section of the middle upstream section of the planetary wheel shaft is circular so as to form a radial expansion part relative to the upstream section and the downstream section of the planetary wheel shaft, and the thickness of the middle upstream section along the axial direction is equal to or larger than the larger thickness in the thicknesses of the sun wheel and the planet wheel, and the radius of curvature of the first cambered surfaces of the upstream section and the downstream section is equal to the radius of the middle upstream section.
In another embodiment according to the invention, the second and upper stage centering devices may each comprise a first radial positioning bearing, the inner ring of which is axially fixedly fitted to the middle of the planet carrier of the upper stage, and the second plane of the upstream section of the second and upper stage planetary axles radially abuts against the outer ring of the positioning bearing, so that the upstream sections of the plurality of planetary axles tightly surround the first radial positioning bearing to radially position the second and upper stage planetary reduction mechanism.
In another embodiment according to the present invention, the first stage centering device may comprise: the inner ring of the second radial positioning bearing is axially and fixedly assembled on the transition section of the input shaft; and the inner wall of the positioning collar is in interference fit with the outer ring of the second radial positioning bearing, a plurality of fastening threaded holes are formed in the circumferential direction, and a circular concave part is formed in the surface of the positioning collar facing the output shaft.
In another embodiment according to the invention, the upstream section of any one of the first stage planetary axles is in rolling radial contact with the side wall of the circular recess to achieve radial positioning of the first stage planetary reduction mechanism.
In another embodiment according to the invention, the upstream section of any one of the first stage planetary axles is sleeved with a rolling bearing, the outer wall of the outer ring of which can be in rolling radial contact with the side wall of the circular recess to radially position the first stage planetary reduction mechanism, and the rolling bearing can be axially abutted against the bottom of the circular recess.
In another embodiment according to the present invention, the upstream end of the ring gear may be provided with a fitting screw hole corresponding to the fastening screw hole in a circumferential direction, so that the ring gear and the positioning collar are fastened together by screwing in a screw.
In another embodiment according to the invention, the two axial end faces of the radial expansion of the midstream section of the second and higher stage planetary wheel shafts may abut against the outer ring of the corresponding radial positioning bearing and the proximal end of the corresponding planet carrier, respectively, to achieve axial positioning of the second and higher stage planetary reduction mechanism.
In another embodiment according to the invention, the two axial end faces of the radial expansion of the midstream section of the first stage planetary axle may abut against the proximal end portions of the rolling bearing and first stage planet carrier, respectively, to achieve axial positioning of the first stage planetary reduction mechanism.
In another embodiment according to the invention, the diameters of the input section, the transition section and the output section of the input shaft may be sequentially reduced; and diameters of the proximal, intermediate and distal portions of the carrier decrease in sequence.
In another embodiment according to the invention, the first and second radial positioning bearings may be deep groove ball bearings.
In another embodiment according to the present invention, a bearing may be fitted between the output shaft and the downstream end of the ring gear to axially fixedly and rotationally connect the output shaft to the ring gear.
Drawings
FIG. 1a shows an exploded side view of a planetary reducer according to the present invention;
fig. 1b shows an exploded perspective view of a planetary reducer according to the invention;
fig. 2 shows an assembled perspective view of the planetary reducer according to the invention, with the ring gear and the positioning collar omitted to better show the components located inside thereof;
Fig. 3 shows an exploded perspective view of the other components of the planetary gear set according to the invention than the ring gear, seen from the input shaft side; and
Fig. 4A and 4B show an end view and a partial cross-sectional view, respectively, of a planetary reduction mechanism of a second stage and above of a planetary reduction gear according to the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in the drawings in order to simplify the drawings.
According to one aspect of the present invention, there is provided a planetary reduction device having a function of radially and axially positioning a planetary reduction mechanism inside thereof with respect to an inner ring gear.
Specifically, in one exemplary embodiment according to the present invention, referring to the exploded view as shown in fig. 1a and 1b, the planetary reduction device 100 includes: an inner gear ring 1 having an upstream end 1a and a downstream end 1b disposed along an axis A-A thereof, and inner teeth 11 extending parallel to the axis; the internal teeth 11 extend over substantially the entire inner wall of the ring gear; an input shaft 2 radially centrally and axially fixedly and rotatably connected to the upstream end 1a of the ring gear 1 along the ring gear axis A-A for receiving high-speed rotational movement; an output shaft 3 radially centrally and axially fixedly and rotatably connected to the downstream end 1b of the ring gear along the ring gear axis A-A for outputting low speed rotational movement, wherein reference herein to "axially fixed" means that the input shaft 2 and the output shaft 3 are fixed to the ring gear 1 so as to be axially immovable relative to the ring gear 1, thereby providing a positioning basis for axial positioning of a planetary reduction mechanism described below; at least one stage of planetary reduction mechanism 4 comprising planetary axles 42 for fitting planetary wheels 41; and at least one centering device 5, the centering device 5 being annular, the centering device 5 being radially centered and axially fixedly disposed with respect to the ring gear 1 and being in rolling radial contact with one end of the planetary axle 42, respectively, for radial positioning of the planetary reduction mechanism 4. By "rolling radial contact" is meant that the radially outer circumferential surface of the planetary axle 42 is in rolling contact with the radially outer circumferential surface of the centering device 5, so that no friction exists between them, which are able to roll relative to each other. Furthermore, since the centering device 5 is radially centered with respect to the ring gear and therefore cannot float radially with respect to the ring gear, and since the radially outer circumferential surface of the planetary axle 42 remains in radial contact with the radially outer circumferential surface of the centering device 5 at all times, it is possible to ensure that the position of the planetary axle 42 and other components connected to the planetary axle 42 in the radial direction is fixed, i.e., radially positioned.
Specifically, in one exemplary embodiment according to the present invention, as shown in fig. 1a and 1B, and 3 and fig. 4A and 4B, the input shaft 2 has an input section 2a, a transition section 2B, and an output section 2c in the axial direction, wherein the input section 2a receives a high-speed rotational movement. Each stage of planetary reduction mechanism 4 further includes: a sun gear 43; two or more planetary axles 42 having a length extending in an axial direction and having an upstream section 421, a midstream section 422, and a downstream section 423 in the axial direction; two or more planetary gears 41 fitted on the midstream section 422 of the planetary gear shaft 42 and meshed with the sun gear 43 and the internal teeth 11 simultaneously; and a carrier 44 having a proximal end portion 441, an intermediate portion 442, and a distal end portion 443 in the axial direction, and the proximal end portion 441 thereof is fastened to the downstream section 423 of the planetary axle 42. In this embodiment, as shown in fig. 3, the first stage centering device 5 is axially fixedly fitted to the transition section 2b of the input shaft 2, and the second and higher stage centering devices 5 are axially fixedly fitted to the intermediate portion 442 of the carrier 44 of the previous stage. The sun gear 43 of the first-stage planetary reduction mechanism 4 is axially fixedly fitted over the output section 2c of the input shaft 2, and the second-stage and higher-stage sun gears 43 are axially fixedly fitted over the distal end portion 443 of the carrier 44 of the preceding stage, and high-speed rotational motion of the input shaft through such connection is transmitted to the first-stage planetary gears 41 through the first-stage sun gears 43, then to the planetary wheel shafts 42 connected to the planetary gears 41, and then to the carrier 44 of the following stage connected to the planetary wheel shafts 42, whereby the rotation of the first stage is transmitted to the second stage at a reduced speed. Further, the final stage carrier 44 is connected to the output shaft 3 or is integrally formed with the output shaft 3, whereby the rotational movement of the input shaft 2 is transmitted to the output shaft 3. The final stage planet carrier may be part of the output shaft 3, thereby reducing the connection means between them, and the planet axle is mounted directly on the flange of the output shaft. The upstream sections 421 of the two or more planet axles 42 are arranged circumferentially around the centering device 5 and are in rolling radial contact with the centering device 5 for radial positioning. In this way, by radial contact of the upstream section 421 of the planetary axle 42 with the circumferential surface of the radially fixed centering device 5, radial positioning of the planetary axle 42, the planetary wheels 41 mounted on the planetary axle 42 and the planet carrier 44 connected to the downstream section 423 of the planetary axle 42 can be achieved, thus achieving radial positioning of the entire planetary reduction mechanism.
In one embodiment according to the present invention, as shown in fig. 4B, the outer surfaces of the upstream section 421 and the downstream section 423 of the planetary axle 42 include first cambered surfaces 421a, 423a extending in the axial direction and second flat surfaces 421p, 423p extending in the axial direction, so that the cross sections of the upstream section 421 and the downstream section 423 take a "D" shape as shown in the end view of fig. 4A. As shown in fig. 4B, the cross section of the midstream section 422 of the planetary axle 42 is circular to form a radially enlarged portion 422 with respect to the upstream section 421 and the downstream section 423 of the planetary axle 42, and the thickness of the midstream section 422 in the axial direction is equal to or greater than the greater thickness of the sun gear 43 and the planetary wheel 41, and the radius of curvature of the first cambered surfaces of the upstream section and the downstream section is equal to the radius of the midstream section. In this embodiment, due to the presence of the radially enlarged portion 422, as shown in fig. 4B, in the reduction mechanism 4 of the second stage and above, the right end face of the radially enlarged portion abuts against the outer peripheral face of the orienting device 5, and the left end face abuts against the proximal end portion 441 of the carrier 44, so that the axial positioning of the reduction mechanism 4 of the second stage and above is achieved. Furthermore, since the thickness of this midstream section 422 is slightly greater than the greater of the thicknesses of the sun wheel 43 and the planet wheel 41, it is ensured that during rotation the planet wheel or sun wheel does not come into frictional contact with the centring device 5 and the planet carrier 44.
In an exemplary embodiment according to the present invention, as shown in fig. 4B, the second-stage and higher-stage centering devices 5 respectively include first radial positioning bearings 51, an inner ring of which is axially fixedly fitted to an intermediate portion 442 of the carrier 44 of the upper stage, and a second plane 421p of the upstream segments 421 of the second-stage and higher-stage planetary axles 42 radially abuts against an outer ring of the positioning bearings 51, so that the upstream segments 421 of the plurality of planetary axles 42 closely surround the first radial positioning bearings 5, that is, the plurality of upstream segments 421 are axially arranged around and closely contact with the outer ring of the first radial positioning bearings 51, so that the plurality of upstream segments 421 can be rollably radially positioned with respect to the inner ring of the first radial positioning bearings 51, thereby radially positioning the second-stage and higher-stage planetary reduction mechanism 4, in particular how radial positioning is achieved, as will be described in detail below.
In an exemplary embodiment according to the present invention, as shown in fig. 3, the first stage centering device 5 includes: a second radial positioning bearing 52, the inner ring of the second radial positioning bearing 52 being axially fixedly fitted to the transition section 2b of the input shaft 2; and a positioning collar 53, the inner wall of which is interference fit with the outer ring of the second radial positioning bearing 52, and is provided with a plurality of fastening screw holes 53h in the circumferential direction, and the surface thereof facing the output shaft 3 is provided with a circular recess 53r, as shown in fig. 3.
In an exemplary embodiment according to the present invention, as shown in fig. 3, the upstream segment 421 of any one of the first-stage planetary axles 42 is in rolling radial contact with the side wall 53rs of the circular recess 53r to achieve radial positioning of the first-stage planetary reduction mechanism 4.
Specifically, in one exemplary embodiment according to the present invention, as shown in fig. 3, the upstream section 421 of any one of the first-stage planetary axles 42 is fitted with a rolling bearing 54, as shown in the assembled state of fig. 2, the outer ring of the rolling bearing 54 is in rolling radial contact with the side wall 53rs of the circular recess 53r to radially position the first-stage planetary reduction mechanism 4, and the rolling bearing 54 is axially capable of abutting against the bottom 53rb of the circular recess 53 r. Further, as shown in fig. 1a and 1b, the upstream end 1a of the ring gear 1 is provided with fitting screw holes 1h corresponding to the fastening screw holes 53h in the circumferential direction, so that the ring gear 1 and the positioning collar 53 are fastened together by screwing in screws. In this embodiment, due to the screw tightening of the ring gear 1 and the positioning collar 53 and the interference fit of the inner ring thereof and the outer ring of the second radial positioning bearing 52, both the axial and radial positions of the positioning collar 53 are fixed, so that both the input shaft 1 and the planetary axle 42 can rotate relative to the positioning collar 53, and the planetary axle 42 is positioned radially relative to the positioning collar 53, that is, cannot float freely in the radial direction, due to the intermediation of the rolling bearing 54. Further, since the rolling bearing 54 is capable of abutting against the bottom 53rb of the circular recess 53r in the axial direction, the axial position of the planetary axle 42, which is interference-fitted with the rolling bearing 54, with respect to the bottom 53rb of the circular recess 53r reaches the bottom 53rb of the circular recess 53r furthest toward the input side. Further, both axial end surfaces of the radially enlarged portion of the midstream section 422 of the first-stage planetary gear shaft 42 abut against the rolling bearing 54 and the proximal end portion 441 of the first-stage carrier 44, respectively, to achieve axial positioning of the first-stage planetary reduction mechanism 4, how this is achieved will be described in detail below.
In summary, as shown in fig. 3 and 4B, the upstream sections 421 of the plurality of first-stage planetary axles 42 (for example, three planetary axles 42 are circumferentially disposed at 120 ° intervals to abut the side walls of the circular recess 53 r) are circumferentially disposed at angular intervals to abut the side walls of the circular recess 53r, and the circular recess 53r is not floatable in the radial direction. Furthermore, the downstream sections 423 of the plurality of first stage planetary axles 42 are held against relative movement with respect to each other by the planet carrier 44, so that the positions of the upstream sections 421 with respect to each other are also fixed, so that the plurality of planetary axles 42 as a whole or in one piece can only roll along the side walls of the circular recess 53r, thus defining a float of the planetary axles 42 in the radial direction. Because the first stage planet axle 42 is also unable to float in the radial direction. The planet carrier 44 connected to the first stage planet axle 42 is therefore also unable to float in the radial direction, and the position of the first radial positioning bearing 51, which is in close fit with the first stage planet carrier 44, is also fixed in the radial direction, so that the integrated second stage planet axle 42 is also fixed in the radial position since it can only roll along the outer ring of the first radial positioning bearing 51. By analogy, the radial position of the planetary reduction above the second stage is also fixed. It will be appreciated by those skilled in the art that due to the existence of manufacturing tolerances, all of the components are allowed to float radially within the scope of the manufacturing tolerances.
In summary, as shown in fig. 3 and 4B, since the input side end face of the midstream section 422 of the first stage planetary gear shaft 42 abuts against the rolling bearing 54 further contacting the positioning collar 53, the output side end face abuts against the first stage planetary carrier 42, and the input side end face of the midstream section 422 of the second stage planetary gear shaft 42 abuts against the first radial positioning bearing 51 fixed to the first stage planetary carrier 44, and the output side end face abuts against the second stage planetary carrier 42, and so on, the output side end face of the last stage planetary gear shaft 42 abuts directly or indirectly against the output shaft 3. Because the axial position of the positioning collar 53 is fixed and the axial position of the output shaft 3 is also fixed, the axial position of each component is fixed due to the abutment of the two end faces of the midstream section 422 of the planetary axle 42 with the corresponding component, and therefore the entire reduction mechanism cannot float at will in the axial direction, but can float within a certain tolerance range in view of manufacturing tolerances.
In a preferred embodiment according to the invention, the diameters of the input section 2a, the transition section 2b and the output section 2c of the input shaft 2 decrease in sequence; and the diameters of the proximal portion 441, the intermediate portion 442 and the distal portion 443 of the carrier 44 decrease in order, whereby the centering device and the sun gear can be better disposed.
In a preferred embodiment according to the invention, the first and second radial positioning bearings 51, 52 are deep groove ball bearings. The deep groove ball bearing is capable of withstanding a certain axial force and is therefore preferred.
In a preferred embodiment according to the present invention, a bearing 32 is fitted between the output shaft 3 and the downstream end 1b of the ring gear 1 to axially fixedly and rotationally connect the output shaft to the ring gear 1. The inner ring of the bearing 32 is in interference fit with the output shaft 3, and the outer ring is in interference fit with the annular gear 1, so that the axial position of the output shaft 3 relative to the annular gear 1 is fixed, and the output shaft can rotate relative to the annular gear 1.
In a preferred embodiment according to the invention, the multi-stage planetary reduction mechanism comprises three-stage planetary reduction mechanisms, each comprising three planetary wheel shafts, three planetary wheels, and one sun wheel.
Those skilled in the art will appreciate that the embodiments described above are exemplary and that modifications may be made by those skilled in the art, and that the structures described in the various embodiments may be freely combined without conflict in terms of structure or principle.
Although the present invention has been described with reference to the accompanying drawings, the examples disclosed in the drawings are intended to illustrate preferred embodiments of the invention and are not to be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
It should be noted that the word "comprising" does not exclude other elements or steps, and that the word "a" or "an" does not exclude a plurality. In addition, any element numbers of the claims should not be construed as limiting the scope of the invention.
Claims (12)
1. A planetary reduction device, comprising:
an inner gear ring having an upstream end and a downstream end disposed along an axis thereof, and inner teeth extending parallel to the axis;
an input shaft radially centered along the ring gear axis and axially fixedly and rotatably connected to an upstream end of the ring gear for receiving high-speed rotational movement;
An output shaft radially centered along the ring gear axis and axially fixedly and rotatably connected to the downstream end of the ring gear for outputting low-speed rotational motion;
At least one stage of planetary reduction mechanism comprising a planetary axle for fitting the planetary wheels; and
At least one centering device which is annular and which is arranged radially centrally and axially fixed relative to the ring gear and is in rolling radial contact with one end of the planetary wheel shaft for radial positioning of the planetary reduction mechanism,
The input shaft is axially provided with an input section, a transition section and an output section, wherein the input section receives high-speed rotary motion;
Each stage of planetary reduction mechanism further comprises:
A sun gear;
two or more planetary axles having a length extending in an axial direction and having an upstream section, a midstream section, and a downstream section in the axial direction;
Two or more planetary gears which are fitted on the midstream section of the planetary gear shaft and meshed with the sun gear and the ring gear simultaneously; and
A planet carrier having a proximal portion, an intermediate portion and a distal portion in an axial direction, and the proximal portion thereof being secured to a downstream section of the planet axle;
The first-stage centering device is axially and fixedly assembled on the transition section of the input shaft, and the second-stage centering device and the upper-stage centering devices are axially and fixedly assembled on the middle part of the planet carrier of the upper stage;
The sun gear of the first-stage planetary reduction mechanism is axially and fixedly sleeved on the output section of the input shaft, and the second-stage sun gear and the upper-stage sun gears are axially and fixedly sleeved on the far end part of the planet carrier of the upper stage;
the last stage planet carrier is connected to or integrally formed with the output shaft;
the upstream sections of the two or more planet axles are circumferentially arranged around the centering device and are in rolling radial contact with the centering device to achieve radial positioning,
Wherein a bearing is fitted between the output shaft and the downstream end of the ring gear to axially fixedly and rotationally connect the output shaft to the ring gear.
2. The planetary reduction device according to claim 1, wherein,
The outer surfaces of the upstream section and the downstream section of the planetary axle comprise a first cambered surface extending along the axial direction and a second plane extending along the axial direction, so that the cross sections of the upstream section and the downstream section are in a D shape; and
The cross section of the midstream section of the planetary axle is circular to form a radial expansion relative to the upstream and downstream sections of the planetary axle, and the thickness of the midstream section in the axial direction is equal to or greater than the greater thickness of the sun and planet wheels, and the radius of curvature of the first cambered surfaces of the upstream and downstream sections is equal to the radius of the midstream section.
3. The planetary reduction device according to claim 2, wherein the second-stage and higher-stage centering devices each include a first radial positioning bearing whose inner ring is axially fixedly fitted to an intermediate portion of a carrier of a higher stage, and a second plane of an upstream section of a second-stage and higher-stage planetary wheel shaft radially abuts against an outer ring of the first radial positioning bearing, so that upstream sections of a plurality of planetary wheel shafts tightly surround the first radial positioning bearing to radially position the second-stage and higher-stage planetary reduction mechanism.
4. The planetary reduction device according to claim 2, wherein the first stage centering device comprises:
the inner ring of the second radial positioning bearing is axially and fixedly assembled on the transition section of the input shaft; and
And the inner wall of the positioning lantern ring is in interference fit with the outer ring of the second radial positioning bearing, a plurality of fastening threaded holes are formed in the circumferential direction, and a circular concave part is formed in the surface of the positioning lantern ring, facing the output shaft.
5. The planetary reduction device of claim 4, wherein an upstream segment of any one of the first stage planetary axles is in rolling radial contact with a sidewall of the circular recess to effect radial positioning of the first stage planetary reduction mechanism.
6. The planetary reduction device according to claim 4, wherein an upstream section of any one of the first-stage planetary axles is fitted with a rolling bearing, an outer wall of an outer ring of which is in rolling radial contact with a side wall of the circular recess to radially position the first-stage planetary reduction mechanism, and the rolling bearing is axially abuttable against a bottom of the circular recess.
7. The planetary reduction device according to claim 4, wherein an upstream end of the ring gear is provided with mating screw holes corresponding to the fastening screw holes in a circumferential direction, so that the ring gear and the positioning collar are fastened together by screwing in screws.
8. A planetary reduction device according to claim 3, wherein the two axial end faces of the radial expansion of the midstream section of the second and superior planetary axles abut against the outer race of the corresponding first radial positioning bearing and the proximal end portion of the corresponding planet carrier, respectively, to effect axial positioning of the second and superior planetary reduction mechanism.
9. The planetary reduction device according to claim 6, wherein both axial end surfaces of the radially enlarged portion of the midstream section of the first-stage planetary axle abut against the rolling bearing and the proximal end portion of the first-stage carrier, respectively, to achieve axial positioning of the first-stage planetary reduction mechanism.
10. The planetary reduction device according to claim 1, wherein diameters of an input section, a transition section, and an output section of the input shaft are sequentially reduced; and
The diameters of the proximal, intermediate and distal portions of the carrier decrease in sequence.
11. A planetary reduction device according to claim 3, wherein the first radial positioning bearing is a deep groove ball bearing.
12. The planetary reduction device of claim 4, wherein the second radial positioning bearing is a deep groove ball bearing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710342438.1A CN106989143B (en) | 2017-05-16 | 2017-05-16 | Planetary reduction gear |
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| CN201710342438.1A CN106989143B (en) | 2017-05-16 | 2017-05-16 | Planetary reduction gear |
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| CN106989143A CN106989143A (en) | 2017-07-28 |
| CN106989143B true CN106989143B (en) | 2024-05-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5295925A (en) * | 1991-11-22 | 1994-03-22 | Harmonic Drive Systems, Inc. | Planetary gear transmission |
| CN101021245A (en) * | 2007-03-21 | 2007-08-22 | 重庆大学 | Coaxle contrarotating high-speed planetary gear transmission |
| CN203594772U (en) * | 2013-12-12 | 2014-05-14 | 江苏真绩机械制造有限公司 | Locating mechanism for first-gear planet carrier of loading machine gearbox |
| CN205678068U (en) * | 2016-06-13 | 2016-11-09 | 广东精铟海洋工程股份有限公司 | A kind of anti-leaping planetary reduction gear |
| CN207080558U (en) * | 2017-05-16 | 2018-03-09 | 北京一维弦科技有限责任公司 | Planetary reducer |
-
2017
- 2017-05-16 CN CN201710342438.1A patent/CN106989143B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5295925A (en) * | 1991-11-22 | 1994-03-22 | Harmonic Drive Systems, Inc. | Planetary gear transmission |
| CN101021245A (en) * | 2007-03-21 | 2007-08-22 | 重庆大学 | Coaxle contrarotating high-speed planetary gear transmission |
| CN203594772U (en) * | 2013-12-12 | 2014-05-14 | 江苏真绩机械制造有限公司 | Locating mechanism for first-gear planet carrier of loading machine gearbox |
| CN205678068U (en) * | 2016-06-13 | 2016-11-09 | 广东精铟海洋工程股份有限公司 | A kind of anti-leaping planetary reduction gear |
| CN207080558U (en) * | 2017-05-16 | 2018-03-09 | 北京一维弦科技有限责任公司 | Planetary reducer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106989143A (en) | 2017-07-28 |
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