CN213017521U - External-meshing duplex planet row speed reducer and driving device - Google Patents
External-meshing duplex planet row speed reducer and driving device Download PDFInfo
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- CN213017521U CN213017521U CN202021304367.XU CN202021304367U CN213017521U CN 213017521 U CN213017521 U CN 213017521U CN 202021304367 U CN202021304367 U CN 202021304367U CN 213017521 U CN213017521 U CN 213017521U
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Abstract
This specification discloses an external gearing pair planet row reduction gear and drive arrangement, the reduction gear includes: casing, planet frame, first sun gear, second sun gear, pair planetary gear, input shaft, output shaft, wherein: the first sun gear and the second sun gear are coaxially arranged in the center of the planetary frame in tandem, the second sun gear is rigidly connected with the input shaft, and the first sun gear is rigidly connected with the shell; the duplex planetary gear comprises a first planetary gear and a second planetary gear, and the first planetary gear and the second planetary gear are coaxially sleeved on a planetary gear shaft in the middle of the planetary frame in a front-back serial manner; the axes of the duplex planet gears are parallel to the main axis of the speed reducer, the first planet gears are externally meshed with the first sun gear, and the second planet gears are externally meshed with the second sun gear; the output shaft is in splined connection with the planet frame.
Description
Technical Field
The utility model relates to a reduction gear technical field particularly, relates to an external gearing duplex planet row reduction gear and drive arrangement.
Background
In the current industrial production, the demand on the speed reducer is higher and higher, and the requirements on the speed reducer of the new energy commercial vehicle mainly comprise large reduction ratio, light weight, strong bearing capacity, high precision, simple manufacture, moderate price and the like. The speed reducer used by the commercial vehicle with the new energy source at present mainly comprises a planetary gear speed reducer and a parallel shaft speed reducer. The planetary gear reducer is widely applied to the field of new energy commercial vehicles due to the advantages of small volume, high transmission efficiency, wide speed reduction range, high precision, long service life and the like. The traditional planetary gear reducer needs to process an inner gear ring, and the processing of the inner gear has the procedures of gear shaping, gear broaching, roll milling, forming grinding and the like, so that the cost is gradually increased. In addition, insufficient accuracy of the ring gear leads to a reduction in the life of the reduction gear and is prone to noise and vibration problems. Therefore, the cost performance of the existing internal tooth processing is not high.
In summary, it is an urgent need to solve the problem of developing a speed reducer to avoid the complicated process of processing the ring gear.
SUMMERY OF THE UTILITY MODEL
The present specification provides an externally meshed duplex planetary gear reducer and drive device to overcome at least one technical problem in the prior art.
According to a first aspect of embodiments herein, there is provided an externally meshed duplex planetary reduction gear comprising: casing, planet frame, first sun gear, second sun gear, pair planetary gear, input shaft, output shaft, wherein: the axis of the second sun gear is collinear with the axis of the first sun gear, the first sun gear and the second sun gear are arranged in tandem at the center of the planetary frame, the second sun gear is rigidly connected with the input shaft, and the first sun gear is rigidly connected with the shell; the planetary frame is of an annular hollow structure, and a plurality of planetary gear shafts are arranged between annular frame bodies of the planetary frame; the duplex planetary gear comprises a first planetary gear and a second planetary gear, the first planetary gear and the second planetary gear are coaxially sleeved on a planetary gear shaft in the middle of the planetary frame in a front-back tandem manner, the first planetary gear is rigidly linked with the second planetary gear, the first planetary gear and the second planetary gear rotate around the planetary gear shaft, and the first planetary gear and the second planetary gear revolve around the axis of the planetary frame; the axes of the duplex planet gears are parallel to the main axis of the speed reducer, the first planet gears are externally meshed with the first sun gear, and the second planet gears are externally meshed with the second sun gear; the output shaft is in splined connection with the planet frame; the diameter of the first sun gear is larger than that of the second sun gear, and the diameter of the first planetary gear is smaller than that of the second planetary gear.
Optionally, the number of the duplex planet gears is at least two.
Optionally, a plurality of the double planetary gears are evenly distributed in the middle space of the planetary frame along the circumferential direction.
Optionally, the reducer further comprises a tapered roller bearing, and the output shaft is mounted in the housing through the tapered roller bearing.
Optionally, the first sun gear is a helical gear, a plurality of bolt holes are formed in the first sun gear, and the first sun gear is rigidly connected to the housing through the plurality of bolt holes.
Optionally, a plurality of bolt holes are formed in the first sun gear, and the plurality of bolt holes are uniformly distributed in the first sun gear.
Optionally, the second sun gear is a helical gear.
Optionally, the second sun gear is integrally formed with the input shaft.
According to a second aspect of the embodiments herein, there is provided a drive apparatus including the above-described externally meshing duplex planetary reduction gear and a drive source for transmitting a drive force to the reduction gear.
The beneficial effects of the embodiment of the specification are as follows:
in the embodiment of the present disclosure, the external-meshing duplex planetary reduction gear uses the second sun gear as a power input end, when a driving force is transmitted from a driving source through the input shaft, the input shaft drives the second sun gear integrally formed therewith to rotate, the second sun gear drives the second planetary gear externally meshed therewith to rotate, the second planetary gear is rigidly connected to the first planetary gear, the first planetary gear is driven by the second planetary gear to rotate around the first sun gear externally meshed therewith, and the first sun gear is rigidly connected to the housing to serve as a transmission fixing end. The first planetary gear and the second planetary gear rotate around a planetary gear shaft of the planetary frame and revolve around the central axis of the planetary frame, the planetary frame rotates under the driving of the duplex planetary gear, and the planetary frame is used as a power output end and connected with the output shaft through splines to transmit power. The diameter of the first sun gear is larger than that of the second sun gear, the diameter of the first planetary gear is smaller than that of the second planetary gear, driving force is transmitted through the second sun gear, and the expected speed reduction effect is achieved according to the preset gear ratio of each planetary gear to the corresponding sun gear. In the embodiment, through the combined transmission design of the two sun gears and the multiple groups of duplex planetary gears, the internal meshing of the planetary gear and the inner gear ring is converted into the external meshing of the duplex planetary gear and the first sun gear, so that the processing of the planetary gear reducer on the inner gear ring in the prior art is avoided, the complexity of production procedures caused by the processing of the inner gear ring is overcome, and the cost of the planetary gear reducer is reduced; the processing of the external teeth is beneficial to improving the processing precision of the tooth surface of the gear, so that the gear meshing is stable, the heat loss of the planetary gear reducer is reduced, the service life of the reducer is prolonged, the probability of noise, vibration and the like is reduced, the use advantage of the planetary gear reducer is reserved, the problem of low processing cost performance of the inner gear ring is solved, the technical progress is achieved, and the performance of the planetary gear reducer is improved.
The innovation points of the embodiment of the specification comprise:
1. in this embodiment, the external-meshing duplex planetary reduction gear uses the second sun gear as a power input end, when a driving force is transmitted from the driving source through the input shaft, the input shaft drives the second sun gear integrally formed therewith to rotate, the second sun gear drives the second planetary gear externally meshed therewith to rotate, the second planetary gear is rigidly connected to the first planetary gear, the first planetary gear is driven by the second planetary gear to rotate around the first sun gear externally meshed therewith, and the first sun gear is rigidly connected to the housing to serve as a transmission fixing end. The first planetary gear and the second planetary gear rotate around a planetary gear shaft of the planetary frame and revolve around the central axis of the planetary frame, the planetary frame rotates under the driving of the duplex planetary gear, and the planetary frame is used as a power output end and connected with the output shaft through splines to transmit power. The diameter of the first sun gear is larger than that of the second sun gear, the diameter of the first planetary gear is smaller than that of the second planetary gear, driving force is transmitted through the second sun gear, and the expected speed reduction effect is achieved according to the preset gear ratio of each planetary gear to the corresponding sun gear. In the embodiment, through the combined transmission design of the two sun gears and the multiple groups of duplex planetary gears, the internal meshing of the planetary gear and the inner gear ring is converted into the external meshing of the duplex planetary gear and the first sun gear, the processing of the planetary gear reducer on the inner gear ring in the prior art is avoided, the complexity of production procedures caused by the processing of the inner gear ring is overcome, and the cost of the planetary gear reducer is reduced; the processing of the external teeth is beneficial to improving the processing precision of the tooth surface of the gear, so that the gear meshing is stable, the heat loss of the planetary gear reducer is reduced, the service life of the reducer is prolonged, the probability of noise, vibration and the like is reduced, the use advantages of the planetary gear reducer are reserved, the problem of low cost performance of the processing of the inner gear ring is solved, the technical progress is achieved, the performance of the planetary gear reducer is improved, and the method is one of the innovation points of the embodiment of the specification.
2. In this embodiment, the first sun gear is rigidly connected to the housing, and the first sun gear serves as a fixed end of transmission to replace an inner gear ring in the prior art; and the inner meshing of the planet gears and the inner gear ring in the prior art is replaced by the outer meshing of the first planet gears and the first sun gear. Therefore, the complex processing of the inner teeth in the prior art is ingeniously avoided through the structural improvement, the production process of the planetary gear reducer is optimized, the heat loss, the running noise and the running vibration of the planetary gear reducer are effectively reduced, the production cost of the planetary gear reducer is reduced, the service life of the planetary gear reducer is prolonged, and the planetary gear reducer is one of the innovation points of the embodiment of the specification.
3. In this embodiment, the planetary frame adopts a circular hollow structure, a plurality of planetary gear shafts are arranged between circular ring frame bodies of the planetary frame, the second sun gear is arranged at the center of the planetary frame, the duplex planetary gear sleeve is arranged on the planetary gear shaft in the middle of the planetary frame, and the planetary frame is connected with the output shaft through a spline. The planetary frame is used as a power output end, the structure of the planetary frame is different from that of a planetary frame in the prior art, the planetary frame is matched with the design of the duplex planetary gear in the scheme, the complex processing of internal teeth in the prior art is ingeniously avoided, the purpose of utilizing the duplex planetary gear and the fixed first sun gear to replace an internal gear ring in the prior art is achieved, and the planetary frame is one of innovation points of the embodiment of the specification.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an angular cross-sectional view of an internal structure of a housing of an externally-meshed duplex planetary reducer according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of an angle of an externally meshed duplex planetary reduction gear set in an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a transmission form of an external-meshing duplex planetary reducer in the embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a first sun gear of an external-meshing duplex planetary reduction gear set according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a second sun gear of an external-meshing double-linkage planetary reducer in the embodiment of the specification.
Description of reference numerals: 102-planet carrier, 104-first sun gear, 106-second sun gear, 108-first planet gear, 110-second planet gear, 112-output shaft, 114-input shaft, 202-tapered roller bearing.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
At present, in the field of speed reducers, planetary gear speed reducers are widely applied to new energy commercial vehicles due to the advantages of small size, high transmission efficiency, wide speed reduction range, high precision, long service life and the like. The traditional planetary gear reducer needs to process an inner gear ring, and the processing of the inner gear has the procedures of gear shaping, gear broaching, roll milling, forming grinding and the like, so that the cost is gradually increased. In addition, insufficient accuracy of the ring gear leads to a reduction in the life of the reduction gear and is prone to noise and vibration problems. Therefore, it is an urgent problem to design a planetary gear reducer to reduce the cost of manufacturing and production.
The embodiment of the specification discloses an external-meshing duplex planet row speed reducer and a driving device. The following are detailed below.
FIG. 1 is an angular cross-sectional view of an internal structure of a housing of an external-mesh twin planetary reduction gear according to an embodiment of the present disclosure. FIG. 2 is a schematic cross-sectional view of an angle of an externally meshed duplex planetary reduction gear in an embodiment of the present disclosure.
In fig. 1, 102-planet frame, 104-first sun, 106-second sun, 108-first planet, 110-second planet, 112-output shaft, 114-input shaft. In FIG. 2, 202-tapered roller bearing.
As shown in fig. 1, the axis of the second sun gear 106 is collinear with the axis of the first sun gear 104, the first sun gear 104 and the second sun gear 106 are arranged in tandem in the center of the planetary frame 102, the second sun gear 106 is rigidly connected to the input shaft 114, and the first sun gear 104 is rigidly connected to the housing (not shown in fig. 1); the planetary frame 102 is of an annular hollow structure, and a plurality of planetary gear shafts are arranged between annular frame bodies of the planetary frame 102, and are arranged to be sleeved with the second planetary gears 110.
The duplex planetary gear comprises a first planetary gear 108 and a second planetary gear 110, the first planetary gear 108 and the second planetary gear 110 are coaxially sleeved on a planetary gear shaft in the middle of the planetary frame 102 in tandem, the first planetary gear 108 is rigidly linked with the second planetary gear 110, the first planetary gear 108 and the second planetary gear 110 rotate around the planetary gear shaft, and the first planetary gear 108 and the second planetary gear 110 revolve around the axis of the planetary frame 102; the axes of the double planetary gears are parallel to the main axis of the reducer, the first planetary gears 108 are in external mesh with the first sun gear 104, and the second planetary gears 110 are in external mesh with the second sun gear 106; the output shaft 112 is splined to the planet carrier 102; the diameter of the first sun gear 104 is larger than the diameter of the second sun gear 106, and the diameter of the first planet gears 108 is smaller than the diameter of the second planet gears 110.
The rigid linkage between the first planetary gears 108 and the second planetary gears 110 means that the first planetary gears 108 and the second planetary gears 110 are welded.
In this embodiment, power is input from the input shaft 114 to drive the second sun gear 106 to rotate, and the second sun gear 106 drives the second planetary gear 110 engaged therewith to rotate, so that the duplex planetary gear revolves around the axis of the sun gear, and then drives the planetary frame 102 to rotate, and further drives the output shaft 112 rigidly connected to the planetary frame 102 to rotate. The diameter relation and the gear ratio among the gears meet the speed reduction requirement of the design of the speed reducer, and the required transmission speed reduction effect can be realized. The external meshing of the first sun gear 104 and the first planet gear 108 is used for replacing the internal meshing of the planet gear and the inner gear ring in the prior art, so that the processing of the inner gear in the production process is avoided, the complicated working procedures caused by the processing of the inner gear ring are overcome, and the cost of the planetary gear reducer is reduced; the processing of the external teeth is beneficial to improving the processing precision of the tooth surface of the gear, so that the gear is meshed stably, the heat loss of the planetary gear reducer is reduced, the service life of the reducer is prolonged, and the probability of noise, vibration and other problems is reduced.
In one embodiment, the number of the double planetary gears (the first planetary gear 108 and the second planetary gear 110) is at least two. When the number of the duplex planetary gears is two or more, the stability of the whole gear system can be effectively improved.
In a specific embodiment, a plurality of the double planetary gears (the first planetary gear 108 and the second planetary gear 110) are evenly distributed in the intermediate space of the planetary frame 102 in the circumferential direction. The plurality of duplex planetary gears are uniformly distributed in the intermediate space of the planetary frame 102, so that the rotating speed of the planetary frame 102 is stable when the speed reducer operates, and the stability of the speed reducer is improved.
As shown in fig. 2, an external-meshing duplex planetary reduction gear further includes: a tapered roller bearing 202.
In a specific embodiment, the reducer further comprises a tapered roller bearing 202, and the output shaft 112 is mounted in the housing through the tapered roller bearing 202. The tapered roller bearing 202 enables the output shaft 112 to be firmly mounted inside the housing, increasing the stability of the reducer.
As shown in fig. 3, in the transmission form of the externally meshed duplex planetary gear reducer in the embodiment of the present disclosure, power is input from the input shaft 114 to rotate the second sun gear 106, the second sun gear 106 rotates the second planetary gear 110 meshed therewith, the first sun gear 104 is fixed to the housing as a transmission fixed end, the first planetary gear 108 is externally meshed with the first sun gear 104, so that the duplex planetary gears (the first planetary gear 108 and the second planetary gear 110) revolve around the axis of the planetary frame 102 to rotate the planetary frame 102, and the planetary frame 102 is rigidly connected to the output shaft 112 to output power from the output shaft 112. The diameter of the first sun gear 104 is larger than that of the second sun gear 106, the diameter of the first planet gears 108 is smaller than that of the second planet gears 110, and the gear ratio between the above gears meets the requirement of the transmission ratio of the speed reducer, power is input through the input shaft 114, and is transmitted out through the speed reducer in a speed reducing way, so that the speed reducing effect with preset requirement is obtained.
As shown in fig. 4, a first sun gear 104 of an external-meshing double planetary reduction gear in the embodiment of the present disclosure is schematically shown. The first sun gear 104 is used as a fixed end of transmission and is rigidly connected with the shell, and the external meshing of the first sun gear 104 and the first planetary gear 108 is used for replacing the internal meshing of an inner gear ring and a planetary gear in the prior art, so that the complex processing of the inner gear in the prior art is avoided, the production process of the planetary gear reducer is optimized, the heat loss and the running noise and vibration of the planetary gear reducer are effectively reduced, and the production cost of the planetary gear reducer is reduced.
In a specific embodiment, the first sun gear 104 is a helical gear, a plurality of bolt holes are disposed on the first sun gear 104, and the first sun gear 104 is rigidly connected to the housing through the plurality of bolt holes. The first sun gear 104 is fixed to the housing by a bolt, so that the first sun gear 104 serves as a fixed end for transmission.
In one embodiment, the first sun gear 104 has a plurality of bolt holes disposed thereon, and the bolt holes are uniformly distributed on the first sun gear 104. The distribution of the bolt holes is based on the specific connection requirements between the housing and the first sun gear 104, and the uniform distribution of the plurality of bolt holes is beneficial to stably and fixedly connecting the first sun gear 104 to the housing.
As shown in fig. 5, a second sun gear 106 of the external gearing duplex planetary reduction gear in the embodiment of the present disclosure is schematically shown. The second sun gear 106 is integrally formed with the input shaft 114 and is externally engaged with the second planetary gears 110. The second sun gear 106 is integrally formed with the input shaft 114 as a power input end, ensuring stable supply of driving power to the speed reducer; the second sun gear 106 is externally engaged with the second planetary gears 110, and a desired speed reduction effect is achieved by setting a predetermined gear ratio.
In one embodiment, the second sun gear 106 is a helical gear. The helical gear has the advantages of stable transmission, high bearing capacity and the like, and the second sun gear 106 is the helical gear, so that the speed reducer has better transmission performance.
In one embodiment, the second sun gear 106 is integrally formed with the input shaft 114. The second sun gear 106 is connected with the input shaft stably, so that the performance of the speed reducer is stable.
To sum up, in the embodiment of the present specification, through the combined transmission design of two sun gears and multiple sets of duplex planetary gears, the internal engagement of the planetary gear and the inner gear ring is replaced by the external engagement of the duplex planetary gear and the first sun gear 104, so that the processing of the planetary gear reducer on the inner gear ring in the prior art is avoided, the problems of complicated processes caused by the processing of the inner gear ring and noise, vibration and the like caused by insufficient precision of the inner gear ring are solved, the use advantages of the planetary gear reducer are retained, the problem of low cost performance of the processing of the inner gear ring is solved, the technical progress is achieved, the performance of the planetary gear reducer is improved, the cost of the planetary gear reducer is reduced, and the service life of the planetary gear reducer is prolonged.
Those of ordinary skill in the art will understand that: the figures are schematic representations of one embodiment, and the blocks or processes in the figures are not necessarily required to practice the present invention.
Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (9)
1. An external gearing duplex planet row speed reducer, comprising: casing, planet frame, first sun gear, second sun gear, pair planetary gear, input shaft, output shaft, wherein:
the axis of the second sun gear is collinear with the axis of the first sun gear, the first sun gear and the second sun gear are arranged in tandem at the center of the planetary frame, the second sun gear is rigidly connected with the input shaft, and the first sun gear is rigidly connected with the shell;
the planetary frame is of an annular hollow structure, and a plurality of planetary gear shafts are arranged between annular frame bodies of the planetary frame;
the duplex planetary gear comprises a first planetary gear and a second planetary gear, the first planetary gear and the second planetary gear are coaxially sleeved on a planetary gear shaft in the middle of the planetary frame in a front-back tandem manner, the first planetary gear is rigidly linked with the second planetary gear, the first planetary gear and the second planetary gear rotate around the planetary gear shaft, and the first planetary gear and the second planetary gear revolve around the axis of the planetary frame;
the axes of the duplex planet gears are parallel to the main axis of the speed reducer, the first planet gears are externally meshed with the first sun gear, and the second planet gears are externally meshed with the second sun gear;
the output shaft is in splined connection with the planet frame;
the diameter of the first sun gear is larger than that of the second sun gear, and the diameter of the first planetary gear is smaller than that of the second planetary gear.
2. An externally meshed duplex planetary reduction gear according to claim 1, wherein the number of duplex planetary gears is at least two.
3. An externally meshed duplex planetary gear set reducer according to claim 1, wherein a plurality of the duplex planetary gears are evenly distributed in the intermediate space of the planetary frame in the circumferential direction.
4. An externally geared duplex planetary gear set reducer according to claim 1 further including a tapered roller bearing through which said output shaft is mounted within said housing.
5. An externally meshed twin planetary gear reducer according to claim 1 in which the first sun gear is a helical gear, the first sun gear is provided with a plurality of bolt holes, and the first sun gear is rigidly connected to the housing by the plurality of bolt holes.
6. An externally meshed duplex planetary gear set reducer according to claim 1, wherein a plurality of bolt holes are provided on the first sun gear, and a plurality of the bolt holes are evenly distributed on the first sun gear.
7. An externally meshed duplex planetary reduction gear according to claim 1, wherein the second sun gear is a helical gear.
8. An externally meshed twin planetary gear reducer according to claim 1 in which the second sun gear is formed integrally with the input shaft.
9. A drive apparatus comprising the double planetary gear set reducer as defined in any one of claims 1 to 8 and a drive source for transmitting a drive force to the reducer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113335042A (en) * | 2021-07-15 | 2021-09-03 | 奇瑞汽车股份有限公司 | Power driving system, control method thereof and automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113335042A (en) * | 2021-07-15 | 2021-09-03 | 奇瑞汽车股份有限公司 | Power driving system, control method thereof and automobile |
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