CN212360665U - Combined speed reducer - Google Patents

Abstract

The utility model discloses a combined speed reducer, which comprises a planet wheel speed reducing unit and a prepressing speed reducing unit; the planet gear speed reducing unit comprises a first input shaft, a first shell, a planet speed reducing mechanism and an output disc; the first input shaft is rotatably connected to the first shell, the planetary reduction mechanism is positioned inside the first shell, and the planetary reduction mechanism is connected to the first input shaft and the output disc; the output disc is connected with the input end of the pre-pressing speed reducing unit; the pre-pressing speed reducing unit comprises a second input shaft, a first shell, a second shell, a speed reducing mechanism, a ball mechanism, an output shaft and an adjusting mechanism; the utility model aims at providing a modular decelerator can carry out the second grade through the cooperation of planet speed reduction unit and pre-compaction speed reduction unit and slow down, improves the bearing moment of torsion, and transmission efficiency is high, and the deceleration ratio is high, and the wearing and tearing loss is little, and the error is little.

Description

Combined speed reducer

Technical Field

The utility model relates to a speed reduction bearing field especially relates to a modular decelerator.

Background

In the production process of mechanical equipment, the two-stage rotation speed ratio needs to be adjusted through a speed reduction bearing, and the high-speed rotation of superior equipment is reduced, so that the low-speed output with larger torque is obtained. The existing speed reduction bearing generally adopts a gear meshing mode for transmission, the speed reduction effect is realized through the tooth difference generated between gears, the noise is large, the vibration is large, and the teeth of the gears are easy to wear or damage in the transmission process, so that the mechanical equipment is broken.

The existing planetary reducer has low transmission efficiency, large transmission ratio error and low reduction ratio, and can not meet the requirements of modern production.

The bearing play is the clearance between the bearing rolling elements and the bearing inner and outer race shells. After the speed reduction bearing works for a period of time, because the working clearance between the ball of the bearing and the inner ring and the outer ring is increased, the increase of the working clearance can cause the rise of temperature rise, the increase of noise and vibration and the shortening of the rolling fatigue life of the bearing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a modular decelerator can carry out the second grade through the cooperation of planet speed reduction unit and pre-compaction speed reduction unit and slow down, improves the bearing moment of torsion, and transmission efficiency is high, and the deceleration ratio is high, and the wearing and tearing loss is little, and the error is little.

To achieve the purpose, the utility model adopts the following technical proposal: a combined speed reducing device comprises a planet wheel speed reducing unit and a prepressing speed reducing unit; the planet gear speed reducing unit comprises a first input shaft, a first shell, a planet speed reducing mechanism and an output disc; the first input shaft is rotatably connected to the first shell, the planetary reduction mechanism is positioned inside the first shell, and the planetary reduction mechanism is connected to the first input shaft and the output disc; the output disc is connected with the input end of the pre-pressing speed reducing unit; the pre-pressing speed reducing unit comprises a second input shaft, a first shell, a second shell, a speed reducing mechanism, a ball mechanism, an output shaft and an adjusting mechanism; the second input shaft is rotatably connected in the first shell and is connected with the output disc; the output shaft is rotationally connected in the second shell; the speed reducing mechanism is rotationally connected with the second input shaft and the output shaft, and the second input shaft drives the output shaft to rotate through the speed reducing mechanism; the ball mechanism is disposed between the speed reduction mechanism and the first housing; the adjusting mechanism is arranged between the output shaft and the second shell and used for adjusting axial play.

Preferably, the planetary reduction mechanism comprises a planetary carrier, a straight-tooth planetary gear, a sun gear and an inner gear ring; the planet carrier is rotatably sleeved on the periphery of the first input shaft; the output disc is rotatably sleeved on the periphery of the first input shaft and is arranged at intervals with the planet carrier; the sun gear is arranged on the periphery of the first input shaft, and the sun gear is positioned between the planet carrier and the output disc; the number of the straight-tooth planet gears is multiple, each straight-tooth planet gear is rotationally connected with the planet carrier and the output disc, and each straight-tooth planet gear is uniformly distributed on the periphery of the sun gear along the circumferential direction and is meshed with the sun gear; the inner gear ring is arranged on the inner wall of the first shell and is meshed with each straight-tooth planet gear; the first input shaft, the planet carrier, the sun gear and the output disc are coaxially arranged.

Preferably, the adjusting mechanism comprises a pressure plate and a prepressing bearing; the pre-pressing bearing is rotatably connected between the output shaft and the second shell, and the pressing plate is arranged on the inner wall of the second shell; one end of the outer ring of the pre-pressing bearing abuts against the pressing plate or the output shaft, and one end of the inner ring of the pre-pressing bearing abuts against the output shaft or the pressing plate.

Preferably, the outer wall of the pressing plate is provided with external threads, the inner wall of the second shell is provided with internal threads, and the pressing plate is in threaded connection with the internal threads through the external threads and the internal threads which are matched with each other.

Preferably, a first connecting platform is formed on the lower end face of the pressing plate, a second connecting platform is formed on the outer wall of the output shaft, the upper end face of the outer ring of the pre-pressing bearing abuts against the lower end face of the first connecting platform, and the lower end face of the inner ring of the pre-pressing bearing abuts against the upper end face of the second connecting platform.

Preferably, the second input shaft comprises a first mounting part, an eccentric part and a second mounting part which are sequentially connected along the axial direction; the first installation part is movably connected with the inner wall of the first shell, the eccentric part is connected with the speed reducing mechanism, and the second installation part is movably connected with the inner wall of the second shell.

Preferably, a linkage ring is formed at one end of the output shaft close to the speed reducing mechanism; the speed reducing mechanism comprises a connecting bearing, a driving disc, an outer swinging wire groove, an inner swinging wire groove and a first ball; the connecting bearing is sleeved on the periphery of the eccentric part, the driving disc is of an annular structure, and the driving disc is sleeved on the periphery of the connecting bearing; the inner cycloid groove is formed in the lower end face of the linkage ring, the outer cycloid groove is formed in the upper end face of the driving disc, a plurality of first balls are arranged, and each first ball is arranged between the inner cycloid groove and the outer cycloid groove.

Preferably, the inner cycloid groove comprises a plurality of first arc-shaped grooves bent towards the inner side of the second shell, the plurality of first arc-shaped grooves are sequentially connected end to end along the circumferential direction to form a ring shape, and the inner bottom surface of each first arc-shaped groove is of an arc-shaped groove structure; the epicycloidal groove comprises a plurality of second arc-shaped grooves which are bent towards the outer side of the driving disc, the plurality of second arc-shaped grooves are sequentially connected end to end along the circumferential direction to form a ring shape, and the inner bottom surfaces of the second arc-shaped grooves are of arc-shaped groove structures; the number of the first arc-shaped grooves is larger than that of the second arc-shaped grooves.

Preferably, the number of the first arc-shaped grooves is N +2, the number of the second arc-shaped grooves is N, the number of the first balls is N +1, and N is an integer greater than zero.

Preferably, a connecting part is formed on the upper end surface of the first shell; the ball mechanism comprises a first mounting groove, a second ball and a second mounting groove; the first mounting grooves are arranged in a plurality and are distributed on the lower end surface of the driving disc along the circumferential direction; the second mounting grooves are arranged in a plurality and are distributed on the upper end face of the connecting part along the circumferential direction, and the second mounting grooves correspond to the first mounting grooves one to one; the second ball bearings are arranged in a plurality and are respectively clamped between the corresponding first mounting groove and the corresponding second mounting groove; the first mounting groove is of a first spherical crown type structure, and the diameter of a ball where the first spherical crown type structure is located is matched with that of the second ball; the second mounting groove is of a second spherical crown type structure, and the diameter of a ball in which the second spherical crown type structure is located is larger than that of the second ball; the sum of the height of the first spherical cap structure and the height of the second spherical cap structure is smaller than the diameter of the second ball.

The above structure is adopted in the utility model, planet wheel speed reduction unit has high rigidity, the high accuracy, high transmission efficiency, advantages such as high moment of torsion carry out the one-level through planet wheel speed reduction unit and slow down, reduce the rotational speed of output dish, improve the moment of torsion to carry out the second grade through pre-compaction speed reduction unit and slow down, further improve transmission efficiency.

This device plays the deceleration effect through planet wheel speed reduction unit and the cooperation of pre-compaction speed reduction unit, has improved transmission efficiency, has promoted the reduction ratio, has reduced the wearing and tearing loss, and the error is little, and the drive ratio error is little.

The rotation eccentric action of the ball mechanism release speed reducing mechanism is adopted, the traditional cross disc structure is removed, the structure of the device is simplified, the device can be processed and manufactured into smaller sizes, and the device accords with industrial production with higher precision.

Drawings

The accompanying drawings are provided to further illustrate the present invention, but the content in the accompanying drawings does not constitute any limitation to the present invention.

Fig. 1 is a schematic top view of the present invention;

FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a schematic perspective view of FIG. 2;

FIG. 4 is one of the schematic partial exploded views of the present invention;

fig. 5 is a second partially exploded view of the present invention;

fig. 6 is a third schematic view of the partially exploded structure of the present invention;

fig. 7 is a fourth schematic view of the partially exploded structure of the present invention.

Wherein: the device comprises a planet wheel speed reducing unit 1, a prepressing speed reducing unit 2, a first input shaft 3 and a first shell 4; the planetary reduction mechanism 5, a planet carrier 5a, a straight-tooth planet gear 5b, a sun gear 5c and an inner gear ring 5 d; an output tray 6;

a second input shaft 7, a first mounting portion 7a, an eccentric portion 7b, and a second mounting portion 7 c;

a first case 8, a connecting portion 8a, and a second case 9;

the device comprises a speed reducing mechanism 10, a connecting bearing 10a, a driving disc 10b, an outer swing groove 10c, an inner swing groove 10d and a first ball 10 e;

the ball mechanism 11, a first mounting groove 11a, a second ball 11b and a second mounting groove 11 c;

an output shaft 12, a second connecting table 12a and a linkage ring 12 b;

the adjusting mechanism 13, a pressure plate 13a, a pre-pressing bearing 13b and a first connecting platform 13 c.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

Referring to fig. 1 to 7, a combined speed reduction device of the present embodiment includes a planetary gear speed reduction unit 1 and a pre-pressing speed reduction unit 2.

The planetary reduction unit 1 includes a first input shaft 3, a first housing 4, a planetary reduction mechanism 5, and an output disc 6.

The first input shaft 3 is rotatably connected to the first housing 4, the planetary reduction mechanism 5 is located inside the first housing 4, and the planetary reduction mechanism 5 is connected to the first input shaft 3 and the output disc 6; the output disc 6 is connected with the input end of the prepressing speed reducing unit 2.

The pre-pressing deceleration unit 2 includes a second input shaft 7, a first housing 8, a second housing 9, a deceleration mechanism 10, a ball mechanism 11, an output shaft 12, and an adjustment mechanism 13.

The second input shaft 7 is rotatably connected in the first shell 8, and the second input shaft 7 is connected with the output disc 6; the output shaft 12 is rotatably connected in the second housing 9.

The speed reducing mechanism 10 is rotatably connected to the second input shaft 7 and the output shaft 12, and the second input shaft 7 drives the output shaft 12 to rotate through the speed reducing mechanism 10.

The ball mechanism 11 is provided between the speed reduction mechanism 10 and the first housing 8.

The adjusting mechanism 13 is disposed between the output shaft 12 and the second housing 9, and the adjusting mechanism 13 is used for adjusting the axial play.

By adopting the structure, the planet wheel speed reducing unit 1 has the advantages of high rigidity, high precision, high transmission efficiency, high torque and the like, primary speed reduction is carried out through the planet wheel speed reducing unit 1, the rotating speed of an output disc is reduced, the torque is improved, and the planet wheel speed reducing unit 1 is used as the power input of the prepressing speed reducing unit 2. The pre-pressing speed reducing unit 2 performs two-stage speed reduction, the transmission efficiency is further improved, friction in the transmission process of the pre-pressing speed reducing unit 2 is reduced through the matching of the speed reducing mechanism 10 and the ball bearing mechanism 11, and abrasion loss is reduced.

This device plays the deceleration effect through the cooperation of planet wheel speed reduction unit 1 and pre-compaction speed reduction unit 2, has improved transmission efficiency, has promoted the reduction ratio, has reduced the wearing and tearing loss, and the error is little, and the drive ratio error is little.

The second input shaft 7 is used as a power input end and connected with the output disc 6, the first shell 8 and the second shell 9 are fixedly connected with an external frame, and the output shaft 12 is used as a power output end and connected with an external connecting device. When the external driving device drives the second input shaft 7 to rotate, under the speed reducing action of the speed reducing mechanism 10, the rotating speed of the output shaft 12 is smaller than that of the second input shaft 7, so that the speed reducing action of the device is realized, the transmission efficiency is improved, the speed reducing ratio is improved, the abrasion loss is reduced, the error is small, and the transmission ratio error is small.

The rotation eccentric action of the speed reducing mechanism 10 is released through the ball mechanism 11, and the traditional cross plate structure is removed, so that the device is more simplified in structure, can be processed and manufactured into smaller sizes, and accords with industrial production with higher precision.

Preferably, the planetary reduction mechanism 5 includes a planetary carrier 5a, a straight-tooth planetary gear 5b, a sun gear 5c, and an inner ring gear 5 d.

The planet carrier 5a is rotatably sleeved on the periphery of the first input shaft 3; the output disc 6 is rotatably sleeved on the periphery of the first input shaft 3 and is arranged at an interval with the planet carrier 5 a.

The sun gear 5c is disposed on the periphery of the first input shaft 3, and the sun gear 5c is located between the carrier 5a and the output disc 6.

Straight-tooth planet wheel 5b is provided with a plurality ofly, and each straight-tooth planet wheel 5b all rotate connect in planet carrier 5a with output disc 6, each straight-tooth planet wheel 5b is in along the circumference equipartition sun gear 5c the periphery and with the meshing of sun gear 5 c.

The inner gear ring 5d is disposed on the inner wall of the first housing 4, and the inner gear ring 5d is engaged with each of the straight-tooth planetary gears 5 b.

The first input shaft 3, the carrier 5a, the sun gear 5c, and the output disc 6 are coaxially disposed.

By adopting the structure, the first input shaft 3 is connected with the external driving end, the first input shaft 3 drives the sun gear 5c to rotate, the sun gear 5c and the inner gear ring 5d are matched to enable each straight-tooth planet gear 5b to rotate, the straight-tooth planet gear 5b drives the output disc 6 to rotate while rotating, and because the sun gear 5c, the straight-tooth planet gears 5b and the inner gear ring 5d have gear difference, therefore, the speed difference exists between the first input shaft 3 and the output disc 6, and the rotating speed of the first input shaft 3 is greater than that of the output disc 6, thereby playing a role in primary speed reduction. The planet carrier 5a keeps each straight-tooth planet wheel 5b rotating synchronously and stably, and the straight-tooth planet wheel 5b is prevented from falling off.

In order to enable the parts to maintain flexible and stable rotation, first rotation bearings are arranged between the planet carrier 5a and the first housing 4, between the first input shaft 3 and the planet carrier 5a, between the first input shaft 3 and the output disc 6, between the respective spur planet gears 5b and the planet carrier 5a, and between the respective spur planet gears 5b and the output disc 6.

Preferably, the adjusting mechanism 13 includes a pressure plate 13a and a preload bearing 13 b; the preload bearing 13b is rotatably connected between the output shaft 12 and the second housing 9, and the pressing plate 13a is disposed on the inner wall of the second housing 9.

One end of the outer ring of the pre-pressing bearing 13b abuts against the pressure plate 13a or the output shaft 12, and one end of the inner ring of the pre-pressing bearing 13b abuts against the output shaft 12 or the pressure plate 13 a.

The axial play of the pre-pressing bearing 13b is adjusted by the matching of the pressing plate 13a and the output shaft 12, the axial play of the pre-pressing bearing 13b is adjusted through the pressing plate 13a, meanwhile, the position of the pressing plate 13a is continuously adjusted, and the pre-pressing bearing 13b drives the output shaft 12 to move axially, so that the clearance of the speed reducing mechanism 10 is adjusted, the rigidity of the bearing is improved, the operation noise is reduced, the guide precision of the second input shaft 7 and the output shaft 12 is improved, the service life is prolonged, and meanwhile, the abrasion in operation can be compensated.

In this embodiment, the first housing 8 and the second housing 9 are fixedly connected by a connecting screw, an inner end surface of the first housing 8 and an inner end surface of the second housing 9 are matched to form an installation space, and the second input shaft 7, the speed reduction mechanism 10, the ball mechanism 11, the output shaft 12, the pressure plate 13a, and the pre-pressing bearing 13b are installed in the installation space.

Preferably, the outer wall of the pressing plate 13a is provided with external threads, the inner wall of the second shell 9 is provided with internal threads, and the pressing plate 13a is in threaded connection with the internal threads through the external threads and the internal threads which are matched with each other.

By adopting the structure, the outer threads and the inner threads are matched with the rotating pressing plate 13a, and the rotating pressing plate 13a presses the pre-pressing bearing 13b, so that the purpose of adjusting the axial clearance of the pre-pressing bearing 13b is realized. The outer threads and the inner threads are matched to enable the pressure plate 13a to achieve high adjusting precision, the adjusting precision can reach 0.02, the running noise of the bearing can be reduced, and the stable transmission of the device is kept.

Preferably, a first connecting platform 13c is formed on a lower end surface of the pressing plate 13a, a second connecting platform 12a is formed on an outer wall of the output shaft 12, an upper end surface of an outer ring of the pre-pressing bearing 13b abuts against a lower end surface of the first connecting platform 13c, and a lower end surface of an inner ring of the pre-pressing bearing 13b abuts against an upper end surface of the second connecting platform 12 a.

In this embodiment, support the outer lane and the inner circle of pre-compaction bearing 13b respectively through first connection platform 13c and the cooperation of second connection platform 12a, when using one section back, pre-compaction bearing 13 b's axial play grow, through rotating clamp plate 13a, can improve pre-compaction bearing 13 b's rigidity with adjusting pre-compaction bearing 13 b's axial play, reduce the operation noise, improve output shaft 12's guide precision, increase of service life, simultaneously can also compensate the wearing and tearing in the operation.

Preferably, the second input shaft 7 includes a first mounting portion 7a, an eccentric portion 7b, and a second mounting portion 7c connected in this order in the axial direction.

The first installation part 7a is movably connected with the inner wall of the first shell 8, the eccentric part 7b is connected with the speed reducing mechanism 10, and the second installation part 7c is movably connected with the inner wall of the second shell 9.

The second input shaft 7 further comprises a collar formed between the first mounting portion 7a and the eccentric portion 7 b. By adopting the structure, the shaft collar can play a good limiting role on the bearing, and the bearing is prevented from deviating in the transmission process.

In this embodiment, the first mounting portion 7a, the collar, the eccentric portion 7b, and the second mounting portion 7c are integrally formed, so that the transmission effect is good, the processing and the production are convenient, each portion and the corresponding component are kept stable in rotation, the operation noise is reduced, and the service life is prolonged.

Preferably, a coupling ring 12b is formed at one end of the output shaft 12 close to the speed reducing mechanism 10; the reduction mechanism 10 includes a connection bearing 10a, a drive plate 10b, an outer cycloid groove 10c, an inner cycloid groove 10d, and a first ball 10 e.

The connecting bearing 10a is sleeved on the periphery of the eccentric portion 7b, the driving disc 10b is of an annular structure, and the driving disc 10b is sleeved on the periphery of the connecting bearing 10 a.

The inner swing groove 10d is arranged on the lower end face of the linkage ring 12b, the outer swing groove 10c is arranged on the upper end face of the driving disc 10b, the first balls 10e are arranged in a plurality, and each first ball 10e is arranged between the inner swing groove 10d and the outer swing groove 10 c.

With this structure, the first connecting table 13c is formed on the lower end surface of the interlocking ring 12 b. The cooperation of interior cycloid groove 10d, first ball 10e and outer cycloid groove 10c realizes rolling transmission motion, utilizes interior cycloid groove 10d and outer cycloid groove 10c to produce the motion of poor tooth, makes the rotational speed of output shaft 12 reduce, realizes the deceleration effect of bearing, has improved transmission efficiency, has promoted the reduction ratio, has reduced the wearing and tearing loss, and the error is little, and the drive ratio error is little.

When adjusting the axial internal clearance of bearing, rotate clamp plate 13a, clamp plate 13a drives pre-compaction bearing 13b along axial displacement, pre-compaction bearing 13b drives output shaft 12 along axial displacement, thereby realize adjusting pre-compaction bearing 13 b's axial internal clearance, adjust the clearance between outer cycloid groove 10c and the interior cycloid groove 10d simultaneously, make first ball 10e can roll steadily between outer cycloid groove 10c and interior cycloid groove 10d, realize good transmission effect, improve the rigidity of this device, reduce the running noise, improve the guide precision, prolong life, simultaneously can also compensate the wearing and tearing in service.

Preferably, the inner cycloid groove 10d includes a plurality of first arc-shaped grooves bent toward the inner side of the second housing 9, the plurality of first arc-shaped grooves are sequentially connected end to end along the circumferential direction to form a ring shape, and the inner bottom surface of each first arc-shaped groove is of an arc-shaped groove structure; the outer cycloid groove 10c comprises a plurality of second arc-shaped grooves which are bent towards the outer side of the driving disc 10b, the plurality of second arc-shaped grooves are sequentially connected end to end along the circumferential direction to form a ring shape, and the inner bottom surfaces of the second arc-shaped grooves are of arc-shaped groove structures; the number of the first arc-shaped grooves is larger than that of the second arc-shaped grooves.

By adopting the structure, the first arc-shaped grooves are connected into the annular inner swing line groove 10d, the second arc-shaped grooves are connected into the annular outer swing line groove 10c, the inner swing line groove 10d and the outer swing line groove 10c are matched to clamp the first ball 10e, the first ball 10e is conveniently driven by rolling in the inner swing line groove 10d and the outer swing line groove 10c, sliding friction is converted into rolling friction, and friction loss between the driving disc 10b and the output shaft 12 is reduced.

The outer cycloid groove 10c, the first ball 10e and the inner cycloid groove 10d are matched to play a good transmission role, and the rotation of the driving disc 10b is transmitted to the rotation of the linkage ring 12 b.

The eccentric distance between the eccentric portion 7b and the second input shaft 7 is set to be a, the diameter of the pitch circle is set to be b, the contour of the inner cycloid groove 10d is a circular line having an amplitude of a and inscribed in a circle having a pitch circle diameter of b, and the contour of the outer cycloid groove 10c is a circular line having an amplitude of a and circumscribed about a circle having a pitch circle diameter of b.

Preferably, the number of the first arc-shaped grooves is N +2, the number of the second arc-shaped grooves is N, the number of the first balls 10e is N +1, and N is an integer greater than zero.

Adopt this kind of structure, adopt N +2 first arc wall, N +1 first ball 10e, the mode that sets up of N second arc wall makes first arc wall, first ball 10e and the cooperation of second arc wall produce the difference tooth motion, reaches speed reduction's purpose, and simultaneously, keep good transmission effect between driving-disc 10b and the output shaft 12 can be guaranteed to N +1 ball, avoid producing the transmission clearance, cause the card to die or rotate inflexible phenomenon.

Preferably, a connecting portion 8a is formed on an upper end surface of the first housing 8.

The ball mechanism 11 includes a first mounting groove 11a, a second ball 11b, and a second mounting groove 11 c.

The first mounting grooves 11a are provided in plurality and distributed on the lower end surface of the drive disk 10b in the circumferential direction.

The second mounting grooves 11c are arranged in a plurality of numbers and distributed along the circumferential direction on the upper end face of the connecting portion 8a, and the second mounting grooves 11c correspond to the first mounting grooves 11a in a one-to-one mode.

The second balls 11b are provided in plurality, and each of the second balls 11b is interposed between the corresponding first mounting groove 11a and the corresponding second mounting groove 11 c.

The first mounting groove 11a is of a first spherical crown type structure, and the diameter of a ball where the first spherical crown type structure is located is matched with that of the second ball 11 b.

The second mounting groove 11c is of a second spherical crown type structure, and the diameter of a ball in which the second spherical crown type structure is located is larger than that of the second ball 11 b; the sum of the height of the first spherical cap type structure and the height of the second spherical cap type structure is smaller than the diameter of the second ball 11 b.

With this structure, the first mounting groove 11a and the second mounting groove 11c cooperate to clamp the second ball 11b, the driving disk 10b and the first housing 8 roll via the second ball 11b, and the eccentric action of the driving disk 10b is released during the rolling of the second ball 11 b.

The diameter of the ball of the first spherical cap structure is matched with that of the second ball 11b, the diameter of the ball of the second spherical cap structure is larger than that of the second ball 11b, and the second mounting groove 11c provides enough deflection space for the second ball 11b, so that the second ball 11b can release the rotating eccentric action of the eccentric part 7 b; the sum of the height of the first spherical cap structure and the height of the second spherical cap structure is smaller than the diameter of the second ball 11b, so that sliding friction generated by contact of the driving disc 10b and the first shell 8 is avoided, and friction loss is reduced.

The first mounting groove 11a, the second ball 11b and the second mounting groove 11c are matched to have higher transmission efficiency, so that the friction force in the transmission process can be effectively reduced, and the mechanical power is improved; the traditional cross plate structure is removed, so that the device is more simplified in structure, can be processed and manufactured into smaller size, and accords with industrial production with higher precision.

In order to keep the parts flexible and stable to rotate, second rotating bearings are arranged between the first mounting portion 7a and the inner wall of the first shell 8, and between the second mounting portion 7c and the inner wall of the linkage ring 12 b.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. A combined speed reducer is characterized by comprising a planet wheel speed reducing unit and a prepressing speed reducing unit;

the planet gear speed reducing unit comprises a first input shaft, a first shell, a planet speed reducing mechanism and an output disc;

the first input shaft is rotatably connected to the first shell, the planetary reduction mechanism is positioned inside the first shell, and the planetary reduction mechanism is connected to the first input shaft and the output disc; the output disc is connected with the input end of the pre-pressing speed reducing unit;

the pre-pressing speed reducing unit comprises a second input shaft, a first shell, a second shell, a speed reducing mechanism, a ball mechanism, an output shaft and an adjusting mechanism;

the second input shaft is rotatably connected in the first shell and is connected with the output disc; the output shaft is rotationally connected in the second shell;

the speed reducing mechanism is rotationally connected with the second input shaft and the output shaft, and the second input shaft drives the output shaft to rotate through the speed reducing mechanism;

the ball mechanism is disposed between the speed reduction mechanism and the first housing;

the adjusting mechanism is arranged between the output shaft and the second shell and used for adjusting axial play.

2. The combined reduction gear of claim 1, wherein the planetary reduction mechanism comprises a planet carrier, a spur planetary gear, a sun gear, and an inner ring gear;

the planet carrier is rotatably sleeved on the periphery of the first input shaft; the output disc is rotatably sleeved on the periphery of the first input shaft and is arranged at intervals with the planet carrier;

the sun gear is arranged on the periphery of the first input shaft, and the sun gear is positioned between the planet carrier and the output disc;

the number of the straight-tooth planet gears is multiple, each straight-tooth planet gear is rotationally connected with the planet carrier and the output disc, and each straight-tooth planet gear is uniformly distributed on the periphery of the sun gear along the circumferential direction and is meshed with the sun gear;

the inner gear ring is arranged on the inner wall of the first shell and is meshed with each straight-tooth planet gear;

the first input shaft, the planet carrier, the sun gear and the output disc are coaxially arranged.

3. The combined reduction gear of claim 1, wherein the adjustment mechanism includes a pressure plate and a preload bearing; the pre-pressing bearing is rotatably connected between the output shaft and the second shell, and the pressing plate is arranged on the inner wall of the second shell;

one end of the outer ring of the pre-pressing bearing abuts against the pressing plate or the output shaft, and one end of the inner ring of the pre-pressing bearing abuts against the output shaft or the pressing plate.

4. The combined speed reducer according to claim 3, wherein the outer wall of the pressing plate is provided with external screw threads, the inner wall of the second casing is provided with internal screw threads, and the pressing plate is screwed by the external screw threads and the internal screw threads which are engaged with each other.

5. A combined speed reducer according to claim 3, wherein a first connecting table is formed on a lower end surface of the pressing plate, a second connecting table is formed on an outer wall of the output shaft, an upper end surface of an outer race of the pre-pressure bearing abuts against a lower end surface of the first connecting table, and a lower end surface of an inner race of the pre-pressure bearing abuts against an upper end surface of the second connecting table.

6. The combined reduction gear according to claim 1, wherein the second input shaft includes a first mounting portion, an eccentric portion, and a second mounting portion connected in this order in the axial direction;

the first installation part is movably connected with the inner wall of the first shell, the eccentric part is connected with the speed reducing mechanism, and the second installation part is movably connected with the inner wall of the second shell.

7. The combined speed reducing device of claim 6, wherein a coupling ring is formed at an end of the output shaft adjacent to the speed reducing mechanism; the speed reducing mechanism comprises a connecting bearing, a driving disc, an outer swinging wire groove, an inner swinging wire groove and a first ball;

the connecting bearing is sleeved on the periphery of the eccentric part, the driving disc is of an annular structure, and the driving disc is sleeved on the periphery of the connecting bearing;

the inner cycloid groove is formed in the lower end face of the linkage ring, the outer cycloid groove is formed in the upper end face of the driving disc, a plurality of first balls are arranged, and each first ball is arranged between the inner cycloid groove and the outer cycloid groove.

8. The combined speed reducer according to claim 7, wherein the inner cycloid groove comprises a plurality of first arc-shaped grooves which are bent towards the inner side of the second shell, the plurality of first arc-shaped grooves are sequentially connected end to end in a circumferential direction to form a ring shape, and the inner bottom surfaces of the first arc-shaped grooves are of an arc-shaped groove structure; the epicycloidal groove comprises a plurality of second arc-shaped grooves which are bent towards the outer side of the driving disc, the plurality of second arc-shaped grooves are sequentially connected end to end along the circumferential direction to form a ring shape, and the inner bottom surfaces of the second arc-shaped grooves are of arc-shaped groove structures; the number of the first arc-shaped grooves is larger than that of the second arc-shaped grooves.

9. The combined speed reducer according to claim 8, wherein the number of the first arc-shaped grooves is N +2, the number of the second arc-shaped grooves is N, the number of the first balls is N +1, and N is an integer greater than zero.

10. The combined speed reducing device of claim 7, wherein the upper end surface of the first casing is formed with a connecting portion;

the ball mechanism comprises a first mounting groove, a second ball and a second mounting groove;

the first mounting grooves are arranged in a plurality and are distributed on the lower end surface of the driving disc along the circumferential direction;

the second mounting grooves are arranged in a plurality and are distributed on the upper end face of the connecting part along the circumferential direction, and the second mounting grooves correspond to the first mounting grooves one to one;

the second ball bearings are arranged in a plurality and are respectively clamped between the corresponding first mounting groove and the corresponding second mounting groove;

the first mounting groove is of a first spherical crown type structure, and the diameter of a ball where the first spherical crown type structure is located is matched with that of the second ball;

the second mounting groove is of a second spherical crown type structure, and the diameter of a ball in which the second spherical crown type structure is located is larger than that of the second ball; the sum of the height of the first spherical cap structure and the height of the second spherical cap structure is smaller than the diameter of the second ball.

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