Speed reducer with small tooth difference

Abstract

The utility model belongs to the technical field of speed reducers, and particularly relates to a small-tooth-difference speed reducer. Comprising a speed reducer shell and a speed reducer end cover which is arranged on one side of the speed reducer shell and used for sealing the speed reducer shell, a transmission assembly which is matched with the speed reducer shell is arranged in the speed reducer shell, and the transmission assembly comprises an eccentric input shaft, a torque conduction balance wheel, a fixed gear and an output gear meshed with the torque conduction balance wheel; when the eccentric input shaft rotates, the torque transmission balance wheel can be driven to perform cycloid rotation along the fixed wheel, and an outer gear ring on the torque transmission balance wheel performs cycloid rotation along with the torque transmission balance wheel, so that the output gear meshed with the torque transmission balance wheel in a small tooth difference manner is driven to rotate; the tooth profile shapes of the inner gear ring, the outer gear ring, the inner gear ring and the outer gear ring are the same and are all in a double-arc tooth shape, and the reduction ratio of the small tooth difference speed reducer is obtained by subtracting the tooth number of the inner gear ring from the tooth number of the outer gear ring of the torque conduction balance wheel and dividing the tooth number of the fixed gear or the output gear.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of speed reducer, and particularly relates to a few-tooth-difference speed reducer. BACKGROUND

[0002] Speed reducer is a device for matching rotation speed and transmitting torque between prime mover and working machine or actuator, and its main purpose is to reduce rotation speed of prime mover and increase torque to output power required by working machine. Commonly used speed reducers include gear reducer, worm reducer, harmonic reducer, cycloidal pin wheel reducer and few-tooth-difference speed reducer.

[0003] Few-tooth-difference speed reducer is a mechanical device for realizing high-efficiency transmission through gear meshing, and its core principle is to realize rotation speed reduction and torque increase through gear combination with few teeth on input shaft and output shaft.

[0004] However, the few-tooth-difference speed reducer on the market has a complex structure. In CN101893063A, a few-tooth-difference planetary speed reducer is mentioned, which improves the existing internal meshing planetary gear transmission device. The components are supported on the housing through a power output structure, the gear meshing pair has the characteristics of multi-tooth meshing and double-line contact, which improves the carrying capacity and lubrication characteristics. However, at least two planetary gears are still required for transmission, and multiple sets of gears and gear shafts need to be arranged in the radial direction, which has a complex structure and is difficult to assemble. The reduction ratio is very large, and it is difficult to calculate and adjust the reduction ratio.

[0005] Therefore, there is a need for a few-tooth-difference speed reducer with a simple structure, coaxial input and coaxial output, easy installation, and long service life. SUMMARY

[0006] The utility model aims at providing a few-tooth-difference speed reducer with a simple structure, coaxial input and coaxial output, easy installation, and long service life.

[0007] The utility model is characterized in that:

[0008] A few-tooth-difference speed reducer, characterized by comprising a speed reducer shell and a speed reducer end cover arranged on one side of the speed reducer shell for closing the speed reducer shell, a transmission assembly arranged in the speed reducer shell and matched with each other, the transmission assembly comprising an eccentric input shaft, a torque transmission pendulum, a fixed gear, and an output gear meshed with the torque transmission pendulum.

[0009] The fixed gear is fixed on the reducer shell or reducer end cover, an outer gear ring is formed on the fixed gear, the torque transmission balance wheel is provided with an inner gear ring and an outer gear ring with different gear numbers, the inner gear ring is located outside the outer gear ring, the inner gear ring and the outer gear ring are oppositely arranged with the tooth tips, the number of gear teeth of the inner gear ring of the torque transmission balance wheel is greater than the number of gear teeth of the outer gear ring of the fixed gear, and the two are engaged with a small gear difference; the eccentric input shaft is rotationally arranged in the reducer shell, the outer ring of the eccentric input shaft is arranged on the eccentric disc, the torque transmission balance wheel is provided with a mounting hole matched with the eccentric disc, the eccentric disc is arranged in the mounting hole, and the eccentric input shaft can drive the torque transmission balance wheel to perform a trochoid rotation around the fixed gear; the output gear is rotationally arranged in the reducer shell, an inner gear ring is formed on the output gear, the number of gear teeth of the inner gear ring of the output gear is greater than the number of gear teeth of the outer gear ring of the torque transmission balance wheel, and the two are engaged with a small gear difference; the number of gear teeth of the fixed gear is the same as the number of gear teeth of the output gear; when the eccentric input shaft rotates, the torque transmission balance wheel can be driven to perform a trochoid rotation along the fixed gear, the outer gear ring on the torque transmission balance wheel performs a trochoid rotation, thereby driving the output gear engaged with the torque transmission balance wheel to perform a rotary rotation; the tooth profile shapes of the inner gear ring, the outer gear ring, the inner gear ring and the outer gear ring are the same, and are all double circular arc tooth profiles; the reduction ratio of the small gear difference reducer is the number of gear teeth of the outer gear ring of the torque transmission balance wheel minus the number of gear teeth of the inner gear ring divided by the number of gear teeth of the fixed gear or the output gear.

[0010] Further, the output gear is fixedly connected with an output flange, a transmission part is protrudingly formed on the output flange, a plurality of transmission holes are formed on the transmission part, a transmission opening is formed on the reducer end cover, and the reducer can transmit torque to an external component through the output flange.

[0011] Further, an annular connecting part is formed on one side of the fixed gear, a plurality of connecting holes are formed on the annular connecting part, a plurality of connecting openings are formed on the reducer end cover, and the fixed gear can be connected with the reducer end cover through a screw rod.

[0012] Further, the torque transmission balance wheel is provided with a receiving groove between the inner gear ring and the outer gear ring, the output gear and the fixed gear are partially clamped in the receiving groove, and the fixed gear is arranged on the outer side of the output gear.

[0013] Further, an input shaft mounting hole is formed in the middle of the reducer shell, the eccentric input shaft is rotationally arranged in the input shaft mounting hole, and a bearing is arranged between the eccentric input shaft and the input shaft mounting hole.

[0014] Compared with the prior art, the utility model has the advantages of the following:

[0015] The few-tooth-difference speed reducer of the utility model includes a speed reducer shell containing a transmission assembly and a speed reducer end cover, the transmission assembly includes an eccentric input shaft, a torque transmission pendulum, a fixed gear and an output gear, the few-tooth-difference cooperation of incomplete meshing between different gears is realized by the tooth number difference change between gears, so that the effect of high speed reduction ratio is achieved, the gears are tightly matched, the occupied space is small, and the overall volume of the speed reducer can be made smaller.

[0016] The specific matching mode includes a fixed gear fixedly arranged on the speed reducer end cover, an outer gear ring is formed on the outer circle of the fixed gear, the tooth number of the outer gear ring is Z2, an inner gear ring matched with the few-tooth-difference fixed gear is formed on the torque transmission pendulum, and the tooth number of the inner gear ring is Z1; the middle part of the torque transmission pendulum is provided with an eccentric input shaft for driving the torque transmission pendulum to swing along the outer gear ring of the fixed gear, the eccentric input shaft rotates, the torque transmission pendulum swings as a whole, correspondingly, the outer gear ring on the torque transmission pendulum also swings as a whole, the tooth number of the outer gear ring on the torque transmission pendulum is Z3; an inner gear ring is formed on the output gear, the tooth number of the inner gear ring is Z4, the output gear is matched with the outer gear ring on the torque transmission pendulum in the few-tooth-difference mode, the size order of the tooth numbers of the gears is Z1>Z2=Z4>Z3, Z2 and Z4 are intermediate numbers of Z1 and Z3, so that when the torque transmission pendulum swings along the fixed gear, the torque transmission pendulum can also reversely drive the output gear to rotate by the swing movement, the number of the gears is adjusted, so that the rotation input and the rotation output are achieved, the rotation output is not required to be adjusted by the multi-stage planetary gear, the structure design is simple, the occupied space is small, and the use requirement of many scenes can be met. Compared with the flexspline and the rigid gear of the harmonic gear, the gears in the speed reducer of the utility model all adopt the rigid gear, the few-tooth-difference cooperation is achieved without the deformed gear ring, the structural strength is higher, and the service life is longer. The calculation formula of the speed reduction ratio is (Z1-Z3):Z4, and the calculation of the speed reduction ratio is very simple. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the utility model.

[0018] Figure 2 is a front view of the utility model.

[0019] Figure 3 is a side view of the utility model.

[0020] Figure 4 is Figure 3 a sectional view.

[0021] Figure 5 is Figure 2 a sectional view.

[0022] Figure 6It is one of internal structure schematic views of the utility model.

[0023] Figure 7 It is two of internal structure schematic views of the utility model.

[0024] Figure 8 It is structure schematic view of eccentric input shaft and torque transmission balance wheel in the utility model.

[0025] Figure 9 It is sectional view of eccentric input shaft and torque transmission balance wheel in the utility model.

[0026] Figure 10 It is structure schematic view of fixed gear and output gear in the utility model.

[0027] Figure 11 It is front view of fixed gear and output gear in the utility model.

[0028] Figure 12 It is structure schematic view of output gear in the utility model.

[0029] Figure 13 It is explosion view of the utility model.

[0030] Meaning represented by the reference numeral in the drawing:

[0031] 1-reducer shell;2-reducer end cover;3-eccentric input shaft;4-torque transmission balance wheel;

[0032] 5-fixed gear;6-output gear;7-outer gear ring;8-inner gear ring;9-outer gear ring;10-eccentric disc;11-mounting hole;12-inner gear ring;13-output flange;14-transmission part;15-transmission hole;16-transmission port;17-annular connecting part;18-connecting hole;19-connecting port;20-receiving groove;21-input shaft mounting hole;22-bearing. DETAILED DESCRIPTION

[0033] The utility model will be further described in connection with specific embodiment:

[0034] A few tooth difference speed reducer, its characterized in being: including reducer shell and the reducer end cover for closing the reducer shell of setting in one side of the reducer shell, the transmission assembly that is set up with each other in the reducer shell, the transmission assembly includes eccentric input shaft, torque transmission balance wheel, fixed gear and the output gear of engaging with torque transmission balance wheel;

[0035] The fixed gear is fixed on the reducer shell or reducer end cover, an outer gear ring is formed on the fixed gear, the torque transmission balance wheel is provided with an inner gear ring and an outer gear ring with different teeth, the inner gear ring is located outside the outer gear ring, the tooth tips of the inner gear ring and the outer gear ring are oppositely arranged, the number of teeth of the inner gear ring of the torque transmission balance wheel is greater than that of the outer gear ring of the fixed gear and the two are engaged with a small tooth difference; the eccentric input shaft is rotatably arranged in the reducer shell, the outer ring of the eccentric input shaft is arranged on the eccentric disc, the torque transmission balance wheel is provided with a mounting hole matched with the eccentric disc, the eccentric disc is arranged in the mounting hole, the eccentric input shaft can drive the torque transmission balance wheel to perform a trochoid rotation around the fixed gear, the output gear is rotatably arranged in the reducer shell, an inner gear ring is formed on the output gear, the number of teeth of the inner gear ring of the output gear is greater than that of the outer gear ring of the torque transmission balance wheel and the two are engaged with a small tooth difference; the number of teeth of the gear of the fixed gear is the same as that of the output gear; when the eccentric input shaft rotates, the torque transmission balance wheel can be driven to perform a trochoid rotation along the fixed gear, the outer gear ring on the torque transmission balance wheel follows to perform a trochoid rotation, thereby driving the output gear engaged with a small tooth difference to perform a rotary rotation; the tooth profile shapes of the inner gear ring, the outer gear ring, the inner tooth ring and the outer tooth ring are the same, and are all double circular arc tooth shapes, compared with the transmission involute tooth shape, the number of engaged teeth is more, and the load capacity is stronger, the double circular arc tooth shape does not need to leave a side gap, and the transmission precision is greatly improved; the reduction ratio of the small tooth difference reducer is the number of teeth of the outer gear ring of the torque transmission balance wheel minus the number of teeth of the inner gear ring divided by the number of teeth of the fixed gear or the output gear.

[0036] The small tooth difference reducer comprises a reducer shell and a reducer end cover for accommodating a transmission assembly, the transmission assembly comprises an eccentric input shaft, a torque transmission balance wheel, a fixed gear and an output gear, the number of teeth of each gear is different, and the gears are engaged with a small tooth difference, so that the small tooth difference reducer has a high reduction ratio, the gears are tightly matched, the space occupied by the gears is small, and the overall size of the reducer can be smaller.

[0037] The specific matching mode comprises a fixed gear fixed on the reducer end cover, an outer gear ring is formed on the outer ring of the fixed gear, the number of teeth of the outer gear ring is Z2, an inner gear ring with a small tooth difference matched with the fixed gear is formed on the force moment conducting swing wheel, the number of teeth of the inner gear ring is Z1, a eccentric input shaft driving the force moment conducting swing wheel to swing along the outer gear ring of the fixed gear is arranged at the middle part of the force moment conducting swing wheel, the eccentric input shaft rotates, the force moment conducting swing wheel swings as a whole, correspondingly, the outer gear ring on the force moment conducting swing wheel also swings as a whole, the number of teeth of the outer gear ring on the force moment conducting swing wheel is Z3, an inner gear ring is formed on the output gear, the number of teeth of the inner gear ring is Z4, the output gear is matched with the outer gear ring on the force moment conducting swing wheel with a small tooth difference, the number of teeth of each gear is arranged in the order of Z1>Z2=Z4>Z3, and Z2 and Z4 are the intermediate numbers of Z1 and Z3, so that when the force moment conducting swing wheel swings along the fixed gear, the force moment conducting swing wheel can also reversely drive the output gear to rotate by the swing movement, the number of teeth of each gear is adjusted, so that the rotation movement input and the rotation movement output are realized, the rotation output is not required to be adjusted through the multi-stage planetary gear, the structure design is simple, the occupied space is small, and the use requirement of many scenes can be met. Compared with the flexspline and the rigid wheel matched with the harmonic gear, the gears in the reducer of the utility model are all rigid gears, the small tooth difference matching is not required to be realized through the deformed gear ring, the structural strength is higher, and the service life is longer. The calculation formula of the reduction ratio is (Z1-Z3):Z4, and the reduction ratio calculation is very simple.

[0038] As a preferred scheme, when the number of teeth Z1 of the inner gear ring and the number of teeth Z3 of the outer gear ring on the force moment conducting swing wheel are 31 and 29 respectively, the number of teeth Z2 of the outer gear ring of the fixed gear and the number of teeth Z4 of the inner gear ring of the output gear are both 30, at this time, the reduction ratio of the reducer is 1:15 through calculation; when the reduction ratio needs to be adjusted according to the use scene, gears with different numbers of teeth can be used, Z1 and Z3 are 32 and 28 respectively, Z2 and Z4 are both 30, at this time, the reduction ratio is 1:7.5.

[0039] Preferably, the output gear is fixedly connected with an output flange, a transmission part is protrusively formed on the output flange, a plurality of transmission holes are formed on the transmission part, and a transmission opening is formed on the reducer end cover, so that the reducer can transmit the torque to an external component through the output flange.

[0040] Preferably, an annular connecting part is formed on one side of the fixed gear, a plurality of connecting holes are formed on the annular connecting part, and a plurality of connecting openings are formed on the reducer end cover, so that the fixed gear can be connected with the reducer end cover through a screw rod.

[0041] Preferably, the inner ring gear and the outer gear of the torque transmission balance wheel have a receiving groove therebetween, the output gear and the fixed gear are partially clamped in the receiving groove, and the fixed gear is arranged outside the output gear.

[0042] Preferably, the middle part of the speed reducer housing is provided with an input shaft mounting hole, the eccentric input shaft is rotatably arranged in the input shaft mounting hole, and a bearing is arranged between the eccentric input shaft and the input shaft mounting hole.

[0043] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A small-difference reducer characterized by: The application relates to a speed reducer, which comprises a speed reducer shell and a speed reducer end cover arranged on one side of the speed reducer shell to close the speed reducer shell, and a transmission assembly arranged in the speed reducer shell. The fixed gear is fixed to the speed reducer shell or the speed reducer end cover, and an outer gear ring is formed on the fixed gear; the torque transmission pendulum gear is provided with an inner gear ring and an outer gear ring with different gear numbers, the inner gear ring is located outside the outer gear ring, the gear tips of the inner gear ring and the outer gear ring are oppositely arranged, the gear number of the inner gear ring of the torque transmission pendulum gear is greater than that of the outer gear ring of the fixed gear, and the two gears are engaged with a small gear difference; the eccentric input shaft is rotatably arranged in the speed reducer shell, and an eccentric disc is arranged on the outer ring of the eccentric input shaft; the torque transmission pendulum gear is provided with a mounting hole matched with the eccentric disc, and the eccentric disc is arranged in the mounting hole; the eccentric input shaft can drive the torque transmission pendulum gear to perform trochoidal rotation around the fixed gear; the output gear is rotatably arranged in the speed reducer shell, and an inner gear ring is formed on the output gear; the gear number of the inner gear ring of the output gear is greater than that of the outer gear ring of the torque transmission pendulum gear, and the two gears are engaged with a small gear difference; the gear number of the fixed gear is the same as that of the output gear; when the eccentric input shaft rotates, the torque transmission pendulum gear can be driven to perform trochoidal rotation along the fixed gear, the outer gear ring of the torque transmission pendulum gear performs trochoidal rotation, thereby driving the output gear engaged with the torque transmission pendulum gear to perform rotary rotation; the tooth profile shapes of the inner gear ring, the outer gear ring, the inner gear ring and the outer gear ring are the same, and are all double circular arc tooth shapes; the speed reduction ratio of the small gear difference speed reducer is the gear number of the outer gear ring of the torque transmission pendulum gear minus the gear number of the inner gear ring divided by the gear number of the fixed gear or the output gear.

2. A few-tooth reduction gear according to claim 1, characterized in that: An output flange is fixedly connected to the output gear, a transmission part is protrusively formed on the output flange, a plurality of transmission holes are formed in the transmission part, a transmission opening is formed in the speed reducer end cover, and the speed reducer can transmit torque to external components through the output flange.

3. A few-tooth reduction gear according to claim 1, characterized in that: An annular connecting part is formed on one side of the fixed gear, a plurality of connecting holes are formed in the annular connecting part, and a plurality of connecting openings are formed in the speed reducer end cover; the fixed gear can be connected to the speed reducer end cover through a screw rod.

4. A few-tooth reduction gear according to any one of claims 1-3, characterized in that: The torque transmission pendulum gear is provided with a containing groove between the inner gear ring and the outer gear ring, and the output gear and the fixed gear are partially clamped in the containing groove; the fixed gear is arranged on the outer side of the output gear.

5. A few-tooth reduction gear according to claim 4, characterized in that: An input shaft mounting hole is formed in the middle of the speed reducer shell, the eccentric input shaft is rotatably arranged in the input shaft mounting hole, and a bearing is arranged between the eccentric input shaft and the input shaft mounting hole.

Images