CN113983154A

CN113983154A - Constant back clearance type planetary speed reducing mechanism

Info

Publication number: CN113983154A
Application number: CN202111358862.8A
Authority: CN
Inventors: 安利书
Original assignee: Newstart Gear Transmission Co ltd
Current assignee: Newstart Gear Transmission Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-01-28

Abstract

The invention discloses a constant back clearance similar planetary reduction mechanism, which relates to the field of speed reducers and comprises an input unit, a parallel reduction unit and a similar planetary reduction unit, wherein the similar planetary reduction unit consists of a planetary transmission unit and an adjusting unit; the parallel speed reduction unit and the planetary transmission unit comprise a common central shaft; the gland of the planetary transmission unit is fixedly connected with the output flange and is rotationally connected with the central shaft; the gear of the planet gear shaft is meshed with the gear ring; the gears and the gear rings of the planetary gear shafts adopt bevel gears; the adjusting unit comprises an adjusting bolt and an adjusting threaded hole arranged on the input flange; the adjusting bolt is provided with double-end threads, one end of the adjusting bolt is screwed into the adjusting threaded hole, the other end of the adjusting bolt is screwed into the planetary gear shaft, and a pressure spring is arranged between the adjusting bolt and the planetary gear shaft. The invention pushes the planet gear shaft to move along the axial direction through the pressure spring, reduces the clearance between the planet gear shaft and the two gears of the gear ring, and proves constant back clearance and high output precision.

Description

Constant back clearance type planetary speed reducing mechanism

Technical Field

The invention relates to the field of speed reducers, in particular to a constant back clearance type planetary speed reducing mechanism.

Background

The planetary reducer is composed of parts such as a sun gear, a plurality of planet gears, a gear ring, an input shaft and an output shaft, and has the advantages of compact structure, small volume, small back clearance, high precision, wide speed reduction range, high transmission efficiency, large output torque and the like, but after long-time operation, the teeth of each gear are worn, so that the back clearance is gradually increased, the noise is increased, the precision is reduced, the adjustment cannot be realized, only the parts can be replaced, and the product cost is increased; the parallel shaft gear reducer achieves the purpose of reducing speed by mutual meshing of all parallel gears, has the advantages of large bearing capacity, low temperature rise and convenience in assembly and disassembly, but has huge structure and lower precision, and cannot be suitable for small and precise working condition environments.

The increase of the back clearance of the gear of the existing planetary reducer cannot be reduced, so a constant back clearance type planetary reducing mechanism needs to be designed urgently to solve the problems of the existing planetary reducer.

Disclosure of Invention

The invention aims to provide a constant back clearance type planetary speed reducing mechanism to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a constant back clearance similar planetary reduction mechanism comprises an input unit, a parallel reduction unit and a similar planetary reduction unit, wherein the similar planetary reduction unit consists of a planetary transmission unit and an adjusting unit; the parallel speed reduction unit and the planetary transmission unit comprise a common central shaft, and the parallel speed reduction unit drives the planetary transmission unit through the central shaft; the planetary transmission unit also comprises a second driving gear, a second driven gear, a gland, a gear ring, a planetary gear shaft and an output flange; the gland and the output flange are respectively arranged on two sides of the gear ring and fixedly connected through bolts, and are respectively in rotating connection with the central shaft through a first bearing and a third bearing; the gland and the output flange are also respectively in rotary connection with the gear ring through an integrated bearing; the gland and the output flange are uniformly provided with a plurality of mutually corresponding slotted holes along the axis, the slotted holes are rotatably provided with planetary gear shafts through second bearings, and gears of the planetary gear shafts are meshed with the gear ring; the gears and the gear rings of the planetary gear shafts adopt bevel gears, and the large ends of the gears and the gear rings of the planetary gear shafts are close to the output flange; the second driving gear is fixedly arranged on the central shaft in a key connection mode, a plurality of second driven gears matched with the planetary gear shaft are arranged on the outer circumference of the second driving gear, the second driven gears are connected with the input end of the planetary gear shaft through connecting bolts, and the second driven gears are meshed with the second driving gear; the adjusting unit comprises an adjusting bolt and an adjusting threaded hole arranged on the input flange, and the adjusting bolt and the adjusting threaded hole are matched with the planetary gear shaft; the adjusting bolt is provided with double-end threads, one end of the adjusting bolt is screwed into the adjusting threaded hole, the other end of the adjusting bolt is screwed into the planetary gear shaft, and a pressure spring is arranged between the adjusting bolt and the planetary gear shaft.

As a further scheme of the invention: the central shaft of the central shaft adopts a hollow shaft.

As a still further scheme of the invention: the integrated bearing adopts a cylindrical roller bearing.

As a still further scheme of the invention: the central shaft is positioned between the second driving gear and the first bearing and is sleeved with a shaft sleeve matched with the inner ring of the first bearing, and the second driving gear abuts against the inner ring of the first bearing through the shaft sleeve.

As a still further scheme of the invention: and the output end of the central shaft is further in threaded sleeve connection with a locking nut matched with the inner ring of the third bearing.

As a still further scheme of the invention: parallel speed reduction unit includes intermeshing's first driving gear and first driven gear, and first driven gear passes through key-type connection mode fixed mounting at the center pin input, the output of input unit and the input key-type connection of first driving gear.

As a still further scheme of the invention: and an elastic check ring for the shaft matched with the first driven gear is also embedded in the central shaft, and the output end of the first driven gear is abutted against the input end of the second driving gear.

As a still further scheme of the invention: the first driving gear, the first driven gear and the second driving gear are helical gears.

As a still further scheme of the invention: the protective shell is fixedly connected with the input end of the gear ring through a bolt, the first driving gear, the first driven gear, the second driving gear, the second driven gear and the gland are all positioned in the protective shell, and an opening for the central shaft and the first driving gear to pass through is formed in the protective shell; the input unit is fixedly arranged on the outer side of the protective shell.

As a still further scheme of the invention: the utility model discloses a hydraulic pressure oil seal, including protective housing, output flange, gear ring, output flange, first oil blanket, second oil blanket and third oil blanket, protective housing outer wall inlays to establish to install with center pin complex, the outer end inlays respectively to establish installs and installs with center pin and gear ring complex second oil blanket and third oil blanket.

Compared with the prior art, the invention has the following beneficial effects:

1. the parallel speed reduction unit and the planetary transmission unit are simultaneously arranged in one speed reduction mechanism, and the characteristics of the parallel speed reduction unit and the planetary transmission unit are combined, so that the planetary speed reduction mechanism has the advantages of large bearing capacity, low temperature rise, high precision, wide speed reduction range, high transmission efficiency, large output torque and the like;

2. the speed reducing mechanism only comprises a central shaft which penetrates from the input end to the output end, and the hollow shaft can be used for threading, so that the wiring is more convenient;

3. through the cooperation between multiple spacing mode and spare part for first driven gear, second driving gear, gland, ring gear and output flange are fixed for the axial position of center pin, effectively improve speed reduction transmission's stability, improve the transmission precision, and the mechanism motion nature is steady more and noise reduction.

4. The adjusting unit is arranged for adjustment, in the operation process, the planetary gear shaft and the gear ring are meshed for a long time for transmission, so that gear teeth are abraded, the return clearance is increased, the pressure spring arranged between the adjusting bolt and the planetary gear shaft pushes the planetary gear shaft to move along the axial direction, the clearance between the planetary gear shaft and the two gears of the gear ring is reduced, the clearance between the two gears is kept constant all the time, the constant back clearance is further ensured, and the output precision is high.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic diagram of an explosive structure according to an embodiment of the present invention.

Fig. 3 is a schematic front view of the embodiment of the invention.

Fig. 4 is a schematic front view of a cross-sectional structure according to an embodiment of the invention.

Notations for reference numerals: 1-input unit, 2-protective shell, 21-first oil seal, 3-first driving gear, 4-first driven gear, 41-shaft circlip, 5-second driving gear, 6-second driven gear, 61-connecting bolt, 7-first bearing, 71-shaft sleeve, 8-gland, 9-integrated bearing, 10-gear ring, 11-central shaft, 12-planetary gear shaft, 13-second bearing, 14-output flange, 141-second oil seal, 142-third oil seal, 15-adjusting threaded hole, 16-adjusting bolt, 17-pressure spring, 18-third bearing and 181-locking nut.

Detailed Description

The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by like reference numerals throughout the several views, and wherein the shape, thickness or height of the various elements may be expanded or reduced in practice. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention. Any obvious modifications or variations can be made to the present invention without departing from the spirit or scope of the present invention.

Examples

Referring to fig. 1 to 4, in an embodiment of the present invention, a constant backlash planetary reduction mechanism includes an input unit 1, a parallel reduction unit, and a planetary reduction unit, where the planetary reduction unit includes a planetary transmission unit and an adjustment unit;

the parallel speed reduction unit and the planetary transmission unit comprise a common central shaft 11, the parallel speed reduction unit drives the planetary transmission unit through the central shaft 11, and the parallel speed reduction unit and the planetary transmission unit are simultaneously arranged in one speed reduction mechanism, so that the characteristics of the parallel speed reduction unit and the planetary transmission unit are combined, and the parallel speed reduction mechanism has the advantages of large bearing capacity, low temperature rise, high precision, wide speed reduction range, high transmission efficiency, large output torque and the like; the central shaft 11 can adopt a hollow shaft or a solid shaft according to customer demands, preferably, the central shaft 11 adopts a hollow shaft, the speed reducing mechanism only comprises the central shaft 11 which is arranged from the input end to the output end in a penetrating mode, the hollow shaft can be used for threading, and wiring is more convenient.

The planetary transmission unit further comprises a second driving gear 5, a second driven gear 6, a gland 8, a gear ring 10, a planetary gear shaft 12 and an output flange 14; the gland 8 and the output flange 14 are respectively installed on two sides of the gear ring 10 and fixedly connected through bolts, and the gland 8 and the output flange 14 are respectively in rotary connection with the central shaft 11 through the first bearing 7 and the third bearing 18; the gland 8 and the output flange 14 are also respectively in rotary connection with the gear ring 10 through an integrated bearing 9, preferably, the integrated bearing 9 adopts a cylindrical roller bearing, the anti-overturning capacity of the output flange 14 is enhanced, and the radial bearing capacity and the bending bearing capacity are improved; the gland 8 and the output flange 14 are uniformly provided with a plurality of mutually corresponding slotted holes along the axis, the slotted holes are rotatably provided with a planet gear shaft 12 through a second bearing 13, and a gear of the planet gear shaft 12 is meshed with the gear ring 10, so that the gland 8 and the output flange 14 are used as a planet carrier; the gears of the planetary gear shafts 12 and the gear rings 9 are bevel gears, and the large ends of the gears of the planetary gear shafts 12 and the gear rings 9 are close to the output flange 14, so that the planetary gear shafts 12 can slide axially conveniently, and the effect of constant return clearance is achieved;

the second driving gear 5 is fixedly arranged on the central shaft 11 in a key connection mode, a plurality of second driven gears 6 matched with the planetary gear shaft 12 are arranged on the outer circumference of the second driving gear 5, the second driven gears 6 are connected with the input end of the planetary gear shaft 12 through connecting bolts 61, and the second driven gears 6 are meshed with the second driving gear 5; the second driving gear 5 rotates to drive the second driven gear 6, the gland 8, the planet gear shaft 12 and the output flange 14 to integrally rotate in a speed reduction way; the central shaft 11 is positioned between the second driving gear 5 and the first bearing 7 and is sleeved with a shaft sleeve 71 matched with the inner ring of the first bearing 7, and the second driving gear 5 props against the inner ring of the first bearing 7 through the shaft sleeve 71, so that the gland 8 is limited to move towards the input end along the axial direction; the output end of the central shaft 11 is further in threaded sleeve connection with a locking nut 181 matched with the inner ring of the third bearing 18, so that the output flange 18 moves towards the output end along the axial direction, and therefore the axial positions of the gland 8, the gear ring 10 and the output flange 14 relative to the central shaft 11 are fixed, and the stability of planetary speed reduction transmission is improved;

the adjusting unit comprises an adjusting bolt 16 and an adjusting threaded hole 15 arranged on the input flange 14, and the adjusting bolt 16 and the adjusting threaded hole 15 are matched with the planet gear shaft 12; the adjusting bolt 16 is provided with double-end threads, one end of the adjusting bolt is screwed into the adjusting threaded hole 15, the other end of the adjusting bolt is screwed into the planet gear shaft 12, and a pressure spring 17 is arranged between the adjusting bolt 16 and the planet gear shaft 12; in the operation process, the planet gear shaft 12 and the gear ring 9 are in meshing transmission for a long time, so that gear teeth are abraded, the return clearance is increased, the pressure spring 17 arranged between the adjusting bolt 16 and the planet gear shaft 12 pushes the planet gear shaft 12 to move along the axial direction, the clearance between the two gears of the planet gear shaft 12 and the gear ring 9 is reduced, the clearance between the two gears is always kept constant, the constant backlash is further ensured, and the output precision is high.

The parallel speed reduction unit comprises a first driving gear 3 and a first driven gear 4 which are meshed with each other, the first driven gear 4 is fixedly arranged at the input end of a central shaft 11 in a key connection mode, a shaft elastic retainer ring 41 matched with the first driven gear 4 is further embedded on the central shaft 11, so that the first driven gear 4 is prevented from moving axially, the output end of the first driven gear 4 is abutted against the input end of a second driving gear 5, so that the second driving gear 5 is prevented from moving axially, and the transmission stability of the parallel speed reduction unit and the planetary transmission unit is ensured; preferably, the first driving gear 3, the first driven gear 4, the second driving gear 5 and the second driven gear 6 are helical gears, so that the meshing degree is increased, the motion is more stable and the noise is reduced.

The output of input unit 1 and the input key-type connection of first driving gear 3, input unit 1 can adopt planet to reduce the speed unit according to the customer's demand and connect, and the coupling joint takes multiple forms such as lock ring connection, and preferably, input unit 1 adopts planet to reduce the speed unit, thereby can adjust the holistic reduction ratio of structure according to the demand, and application scope is wider.

The mechanism further comprises a protective shell 2, the protective shell is fixedly connected with the input end of the gear ring 10 through a bolt, the first driving gear 3, the first driven gear 4, the second driving gear 5, the second driven gear 6 and the gland 8 are all located in the protective shell 2, and an opening for the central shaft 1 and the first driving gear 3 to pass through is formed in the protective shell 2; the input unit 1 is fixedly arranged on the outer side of the protective shell 2, and the parts are protected by the protective shell 2, so that the input unit 1 is convenient to install and is more convenient and safer;

a first oil seal 21 matched with the central shaft 11 is embedded in the outer wall of the protective shell 2, and a second oil seal 141 and a third oil seal 142 matched with the central shaft 11 and the gear ring 10 are respectively embedded in the inner end and the outer end of the output flange 14; through setting up the leakproofness that improves the mechanism, prevent that the dust from getting into and fluid is excessive.

The motor is connected at the 1 input of input unit, the 1 output of input unit drives first driving gear 3 and rotates, first driving gear 3 rotates with first driven gear 4 intermeshing, it rotates to drive second driving gear 5, second driven gear 6 rotates with second driving gear 5 intermeshing, second driven gear 6 and planetary gear axle 12 bolted connection, second driven gear 6 drives planetary gear axle 12 and rotates around ring gear 9, planetary gear axle 12 passes through adjusting bolt with output flange 14 and is connected, planetary gear axle 12 drives output flange 14 and rotates, realize speed reduction transmission.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A constant back clearance similar planetary reduction mechanism is characterized by comprising an input unit (1), a parallel reduction unit and a similar planetary reduction unit, wherein the similar planetary reduction unit consists of a planetary transmission unit and an adjusting unit;

the parallel speed reduction unit and the planetary transmission unit comprise a common central shaft (11), and the parallel speed reduction unit drives the planetary transmission unit through the central shaft (11);

the planetary transmission unit further comprises a second driving gear (5), a second driven gear (6), a gland (8), a gear ring (10), a planetary gear shaft (12) and an output flange (14); the gland (8) and the output flange (14) are respectively installed on two sides of the gear ring (10) and fixedly connected through bolts, and the gland (8) and the output flange (14) are respectively in rotating connection with the central shaft (11) through a first bearing (7) and a third bearing (18); the gland (8) and the output flange (14) are also respectively in rotary connection with the gear ring (10) through an integrated bearing (9); the gland (8) and the output flange (14) are uniformly provided with a plurality of mutually corresponding slotted holes along the axis, the slotted holes are rotatably provided with a planet gear shaft (12) through a second bearing (13), and a gear of the planet gear shaft (12) is meshed with the gear ring (10); the gears and the gear ring (9) of the planet gear shaft (12) adopt bevel gears, and the large ends of the gears and the gear ring (9) of the planet gear shaft (12) are close to the output flange (14); the second driving gear (5) is fixedly arranged on the central shaft (11) in a key connection mode, a plurality of second driven gears (6) matched with the planetary gear shafts (12) are arranged on the outer circumference of the second driving gear (5), the second driven gears (6) are connected with the input ends of the planetary gear shafts (12) through connecting bolts (61), and the second driven gears (6) are meshed with the second driving gear (5);

the adjusting unit comprises an adjusting bolt (16) and an adjusting threaded hole (15) formed in the input flange (14), and the adjusting bolt (16) and the adjusting threaded hole (15) are matched with the planetary gear shaft (12); the adjusting bolt (16) is provided with double-end threads, one end of the adjusting bolt is screwed into the adjusting threaded hole (15), the other end of the adjusting bolt is screwed into the planet gear shaft (12), and a pressure spring (17) is arranged between the adjusting bolt (16) and the planet gear shaft (12).

2. Constant-backlash planetary reduction mechanism according to claim 1, wherein the central shaft (11) of the central shaft (11) is a hollow shaft.

3. Constant backlash planetary reduction mechanism according to claim 1, wherein said integrated bearing (9) is a cylindrical roller bearing.

4. The constant-backlash planetary reduction mechanism according to claim 1, wherein a shaft sleeve (71) matched with the inner ring of the first bearing (7) is sleeved between the second driving gear (5) and the first bearing (7) on the central shaft (11), and the second driving gear (5) abuts against the inner ring of the first bearing (7) through the shaft sleeve (71).

5. The constant-backlash planetary reduction mechanism according to claim 4, wherein the output end of the central shaft (11) is further in threaded sleeve connection with a lock nut (181) which is matched with the inner ring of the third bearing (18).

6. The constant-back-clearance planetary reduction mechanism according to any one of claims 1 to 5, wherein the parallel reduction unit comprises a first driving gear (3) and a first driven gear (4) which are meshed with each other, the first driven gear (4) is fixedly arranged at the input end of the central shaft (11) in a key connection mode, and the output end of the input unit (1) is in key connection with the input end of the first driving gear (3).

7. The constant-backlash planetary reduction mechanism according to claim 6, wherein a shaft circlip (41) engaged with the first driven gear (4) is further embedded in the central shaft (11), and an output end of the first driven gear (4) abuts against an input end of the second driving gear (5).

8. The constant-backlash planetary reduction mechanism according to claim 6, wherein the first driving gear (3), the first driven gear (4), and the second driving gear (5) are helical gears, and the second driven gear (6) is a helical gear.

9. The constant back clearance type planetary reduction mechanism according to claim 6, further comprising a protective housing (2), wherein the protective housing is fixedly connected with an input end of the gear ring (10) through a bolt, the first driving gear (3), the first driven gear (4), the second driving gear (5), the second driven gear (6) and the gland (8) are all located in the protective housing (2), and an opening for the central shaft (1) and the first driving gear (3) to pass through is formed in the protective housing (2); the input unit (1) is fixedly arranged on the outer side of the protective shell (2).

10. The constant-backlash planetary reduction mechanism according to claim 9, wherein a first oil seal (21) fitted to the central shaft (11) is fitted to an outer wall of the protective housing (2), and a second oil seal (141) and a third oil seal (142) fitted to the central shaft (11) and the ring gear (10) are fitted to an inner end and an outer end of the output flange (14), respectively.