CN205371555U - Accurate speed reducer and eccentric shaft drive mechanism thereof - Google Patents
Accurate speed reducer and eccentric shaft drive mechanism thereof Download PDFInfo
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- CN205371555U CN205371555U CN201620125100.1U CN201620125100U CN205371555U CN 205371555 U CN205371555 U CN 205371555U CN 201620125100 U CN201620125100 U CN 201620125100U CN 205371555 U CN205371555 U CN 205371555U
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- bearing
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- eccentric shaft
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- rib
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Abstract
The utility model provides an accurate speed reducer and eccentric shaft drive mechanism thereof, the eccentric shaft drive mechanism include: have the eccentric shaft of eccentric circle, eccentric bearing and support bearings, eccentric bearing jacket establishes on the eccentric circle, and support bearings cover is established on the eccentric shaft and be adjacent with the eccentric circle, support bearings includes: bearing inner race, cover bearing inner race outside bearing inner race and be located bearing inner race and bearing inner race between a plurality of rolling elements, be equipped with flange towards the one end of eccentric circle at bearing inner race along the axial, keep off ring edge and wind eccentric shaft and all rolling elements of backstop, flange and eccentric bearing along axial contact. This technical scheme guide ring wearability is good, can bear the friction of eccentric bearing and is difficult for suffering wearing and tearing, promotes accurate speed reducer and eccentric shaft drive mechanism thereof's life -span.
Description
Technical field
This utility model relates to a kind of accurate retarding machine and eccentric shaft drive mechanism thereof.
Background technology
Accurate retarding machine, is a kind of power transmission mechanism, for the rotating speed by reducing motor, and obtains bigger output torque.
Current accurate retarding machine is with Japan's RV reductor for representative, and it is little that it has volume, and anti-impact force is strong, and moment of torsion is big, positioning precision is high, vibrates little, the plurality of advantages such as speed reducing ratio is big, thus is widely used in industrial robot, lathe, medical treatment detection device, the field such as satellite receiving system.
RV reductor includes two support plates, arrange along power direction of transfer planetary gear set and cycloidal-pin wheel assembly.It is connected by eccentric shaft drive mechanism between planetary gear set with cycloidal-pin wheel assembly.Wherein, the number of eccentric shaft drive mechanism is identical with planetary gear, and connects one to one with planetary gear.
Eccentric shaft drive mechanism includes the eccentric shaft with two off-centre operations, and one end of eccentric shaft connects planetary gear, and planetary gear connects input.Being arranged with capacity eccentric bearing outside two off-centre operations respectively, cycloidal-pin wheel assembly includes Cycloidal Wheel, and Cycloidal Wheel is set in outside capacity eccentric bearing, and Cycloidal Wheel connects outfan.
Being respectively arranged at two ends with two block bearings at eccentric shaft, two capacity eccentric bearings are between two block bearings, and two block bearings are separately mounted in the axis holes of two support plates.The rotary motion of eccentric shaft is played a supporting role by block bearing.
In the prior art, between adjacent block bearing and capacity eccentric bearing, it is provided with the packing ring being set on eccentric shaft.When capacity eccentric bearing rotates generation axial displacement, packing ring plays the effect of axial limiting.Gasket construction is succinct.But, owing to packing ring is relatively thin, it is impossible to enough carry out integral quenching process, but after adopting mild steel stamping, do Surface hardening treatment (nitrogenize or nitrocarburizing etc.) again, cause wearing no resistance of packing ring.Especially, when capacity eccentric bearing rotates and packing ring is produced larger axis to power, packing ring can suffer Fast Wearing, and then reduces the life-span of accurate retarding machine and eccentric shaft drive mechanism thereof.
Utility model content
The problem that this utility model solves is that the life-span of existing accurate retarding machine and eccentric shaft drive mechanism thereof is shorter.
For solving the problems referred to above, this utility model provides a kind of eccentric shaft drive mechanism for accurate retarding machine, this eccentric shaft drive mechanism includes: have the eccentric shaft of off-centre operation, capacity eccentric bearing and block bearing, described capacity eccentric bearing is set on described off-centre operation, and described block bearing is set on described eccentric shaft and adjacent with described off-centre operation；Described block bearing includes: bearing inner race, the bearing outer ring being enclosed within outside described bearing inner race and the some rolling elements between described bearing inner race and bearing outer ring, being provided with rib at described bearing inner race axially towards one end of described off-centre operation, described rib surrounds described eccentric shaft all described rolling elements of backstop；Wherein said rib and described capacity eccentric bearing axially in contact with.
Alternatively, in two end faces that described capacity eccentric bearing contacts with described rib, at least one end face is smooth flat.
Alternatively, described capacity eccentric bearing is retainer roller bearing, and described retainer roller bearing includes retainer, and described rib contacts at least partly with described retainer.
Alternatively, the external diameter of described rib is not less than twice and the retainer internal diameter sum of the eccentric throw corresponding to described off-centre operation.
Alternatively, described rib and described bearing inner race are formed in one.
Alternatively, described off-centre operation is two, described capacity eccentric bearing is two, two described capacity eccentric bearings are respectively fitted over outside two described off-centre operations, described block bearing is two, two described capacity eccentric bearings are between two described block bearings, and the described rib of each described block bearing contacts vertically at least partly with adjacent described capacity eccentric bearing.
Alternatively, described block bearing is taper roll bearing.
This utility model also provides for a kind of accurate retarding machine, and accurate retarding machine includes any of the above-described described eccentric shaft drive mechanism.
Compared with prior art, the technical solution of the utility model has the advantage that
Rib to bear the friction of some rolling elements for a long time, has preferably wearability.Compared to packing ring, rib can bear the friction of capacity eccentric bearing and not be subject to abrasion, even if capacity eccentric bearing rotates and rib is produced larger axis to power, rib can keep good and obtain wearability, there is long service life, and then promote the life-span of accurate retarding machine and eccentric shaft drive mechanism thereof.
Moreover, it is contemplated that, rolling element is also carried out axial stop to prevent rolling element axial float by rib, and therefore rib has thicker degree compared to plain washer.Therefore, it can rib is carried out integral quenching process so that rib wearability is good, this can ensure that accurate retarding machine and eccentric shaft drive mechanism thereof have long service life.
Further, packing ring given up by the eccentric shaft drive mechanism of the technical program, and the rib of bearing inner race is improved, and increases its external diameter so that rib can contact vertically at least partly with capacity eccentric bearing.Which reduce the amount of parts of eccentric shaft drive mechanism, simplify the internal structure of an organization, convenient for assembly.
Accompanying drawing explanation
Fig. 1 is the exploded view of the accurate retarding machine of this utility model specific embodiment, wherein illustrate only eccentric shaft drive mechanism and first support plate and second support plate；
Fig. 2 is the profile of the accurate retarding machine of this utility model specific embodiment；
Fig. 3 is the axonometric chart of eccentric shaft drive mechanism in accurate retarding machine shown in Fig. 2；
Fig. 4 is the side view of eccentric shaft drive mechanism in accurate retarding machine shown in Fig. 2；
Fig. 5 is the Fig. 4 profile along CC direction；
Fig. 6 is the profile of block bearing in eccentric shaft drive mechanism shown in Fig. 4.
Detailed description of the invention
Understandable for enabling above-mentioned purpose of the present utility model, feature and advantage to become apparent from, below in conjunction with accompanying drawing, specific embodiment of the utility model is described in detail.
Seeing figures.1.and.2, accurate retarding machine includes: first support plate 1 and second support plate 2；Eccentric shaft drive mechanism 3.
With reference to Fig. 3 and Fig. 4 and in conjunction with Fig. 5, eccentric shaft drive mechanism 3 includes: have 30, two capacity eccentric bearings 32 of eccentric shaft of two off-centre operations 31 and two block bearings 33, two block bearings 33 are all set in the two ends of eccentric shaft 30, two off-centre operations 31 are between two block bearings 33, and two capacity eccentric bearings 32 are respectively sleeved on two off-centre operations 31.
With reference to Fig. 5 and Fig. 6, block bearing 33 includes: bearing inner race 331, the bearing outer ring 332 being enclosed within outside bearing inner race 331 and the rolling element 333 between bearing inner race 331 and bearing outer ring 332.Bearing inner race 331 is provided with rib 334 axially towards one end of off-centre operation 31, and rib 334 is around eccentric shaft 30 all rolling elements 333 of backstop.
With reference to Fig. 5, capacity eccentric bearing 32 is retainer roller bearing, and including retainer 320 and some rollers 321, wherein retainer 320 circumferentially includes the plurality of pockets (in figure non-label) of holding some rollers 321.
Wherein, rib 334 and adjacent retainer 320 axially in contact with, rib 334 is applied axial compressive force and comes in contact friction with rib 334 by retainer 320 when rotated.Now, rib 334 radially exceedes the endoporus of retainer 320 and axially contact with retainer 320.The endoporus of retainer 320 refers to the retainer 320 through hole by 30 traverses of eccentric shaft.
Rib 334 to bear the friction of some rolling elements 333 for a long time, has preferably wearability.Packing ring given up by the eccentric shaft drive mechanism 3 of the technical program, the rib 334 of bearing inner race 331 is improved, increases its external diameter so that rib 334 can contact vertically at least partly with retainer 320.Compared to packing ring, rib 334 can bear the friction of retainer 320 and not be subject to abrasion, even if capacity eccentric bearing 32 rotates and rib 334 produces larger axis to power, rib 334 can keep good wearability, there is long service life, and then promote the life-span of accurate retarding machine and eccentric shaft drive mechanism 3 thereof.
Moreover, it is contemplated that, rolling element 333 is also carried out axial stop to prevent rolling element 333 play vertically by rib 334, and therefore rib 334 has thicker degree compared to plain washer.Therefore, it can rib 334 is carried out integral quenching process so that rib 334 wearability is good, this can ensure that accurate retarding machine and eccentric shaft drive mechanism 3 thereof have long service life.
Further, the technical program has given up packing ring, decreases the amount of parts of eccentric shaft drive mechanism 3, simplifies the internal structure of an organization, convenient for assembly.
For reducing the coefficient of friction between rib 334 and retainer 320 adjacent thereto, rib 334 can be smooth flat towards the end face (in figure non-label) of adjacent retainer 320；Or,
Retainer 320 is smooth flat towards the end face (in figure non-label) of adjacent rib 334；Or, two end faces (in figure non-label) that rib 334 contacts with adjacent retainer 320 are smooth flat.Smooth flat can reduce the coefficient of friction between retainer 320 and adjacent rib 334, rib 334 and retainer 320 and all be not easy to be worn and torn, and improves whole accurate retarding machine and the service life of eccentric shaft drive mechanism 3 thereof.
Eccentric shaft 30 has axis O, and off-centre operation 31 (in Fig. 5, the off-centre operation 31 of top is example) has centrage O', has eccentric throw h between the two.The external diameter of the rib 334 adjacent with this off-centre operation 31 is not less than twice and the retainer 320 internal diameter sum of eccentric throw h.Off-centre operation 31 has the far-end A away from axis O and the near-end B near axis O.
When external diameter at rib 334 is equal to the twice of the eccentric throw h corresponding to adjacent off-centre operation 31 with retainer 320 internal diameter sum, rib 334 at least can radially exceed far-end A and contact with retainer 320.Further, when twice more than the eccentric throw h corresponding to adjacent off-centre operation 31 of the external diameter of rib 334 is with retainer 320 internal diameter sum, rib 334 can and far-end A corresponding to retainer 320 between there is large contact area, axial float when retainer 320 can be rotated by rib 334 forms significantly more efficient stop.
But while it is noted that, the maximum outside diameter of rib 334 can set that as: rib 334 radially without departing from the retainer 320 of near-end B location, and to avoid rib 334 to conflict with miscellaneous part, this can be determined according to concrete installation environment.
In this programme, rib 334 and bearing inner race 331 are formed in one.After bearing inner race 331 has manufactured, forge to obtain rib 334 to the respective end of bearing inner race 331.Forging includes mold pressing extrusion and turning.Mold pressing extrusion refers to inserts bearing inner race 331 in a mould and makes its one end to expose, and uses one end that bearing inner race 331 is exposed by metal forming machinery to forge afterwards, forms required rib 334.Turning refers to and bearing inner race 331 carries out circumference turning, and final bearing inner race 331 does not suffer that the one end of turning has bigger external diameter, as rib 334.
In other embodiments, capacity eccentric bearing can be the other kinds of capacity eccentric bearing outside retainer roller bearing.Now, the rib at least axially contact abrasion with the turning collar of capacity eccentric bearing.
Block bearing 33 can be taper roll bearing, and rolling element 333 is taper roller.Taper roll bearing can bear bigger axial load, to keep out the larger axis produced when adjacent capacity eccentric bearing 32 rotates to power.In other embodiments, block bearing can also be other standards bearing, such as angular contact ball bearing.
With reference to the profile that Fig. 2, Fig. 2 are accurate retarding machines, accurate retarding machine also includes:
Planetary gear set 4；
Cycloidal-pin wheel assembly 5, is positioned at the outfan of planetary gear set 4.
Planetary gear set 4 includes: the sun gear (not shown) coaxially connected with power shaft 6, the planetary gear 40 being arranged in around sun gear and engaging with sun gear, eccentric shaft 30 and planetary gear 40 one_to_one corresponding and coaxially connected, namely the number of eccentric shaft 30 is identical with the number of planetary gear 40.Wherein, in side, planetary gear 40 place, block bearing 33 is between planetary gear 40 and off-centre operation 31, and block bearing 33 and planetary gear 40 are installed in the axis hole of first support plate 1.
The pin wheel housing 51 that cycloidal-pin wheel assembly 5 includes Cycloidal Wheel 50, is sheathed on outside Cycloidal Wheel 50, and it is located at pin wheel housing 51 inner peripheral surface and gear pin 52 evenly arranged along the axial.Pin wheel housing 51 is coaxial with power shaft, and the tooth of Cycloidal Wheel 50 outer peripheral face contacts with gear pin 52 bias.Wherein, more than the number of tooth in Cycloidal Wheel 50 one of the number of gear pin 52.Cycloidal Wheel 50 has axially aligned two, and two Cycloidal Wheel 50 are radially symmetrical with the contact site of gear pin 52, so that two Cycloidal Wheel 50 are made as a whole, have the central shaft coaxial with power shaft 6.
Wherein, each Cycloidal Wheel 50 offers the same number of through hole with eccentric shaft 30, and with eccentric shaft 30 one_to_one corresponding, every eccentric shaft 30 is each passed through the through hole of correspondence.Every eccentric shaft 30 all has two off-centre operations 31, with Cycloidal Wheel 50 one_to_one corresponding.Two capacity eccentric bearings 32 are sheathed in the through hole of Cycloidal Wheel 50 of correspondence respectively.
Following is a brief introduction of the operation principle of accurate retarding machine.
First, driving mechanism is utilized to input certain rotating speed N0 to sun gear, planetary gear 40, and be transferred to eccentric shaft 30.Wherein, rotating speed N0 carries out first order deceleration via planetary gear set 4, is converted into one-level rotating speed N1.
Secondly, one-level rotating speed N1 is transferred to the Cycloidal Wheel 50 of cycloidal-pin wheel assembly 5 via the off-centre operation 31 of eccentric shaft 30, capacity eccentric bearing 32 (with reference to Fig. 5).Due to, off-centre operation 31 makes eccentric rotary relative to the central shaft of planetary gear 40.Here, the rotation around its central axis of off-centre operation 31 is called rotation.
When off-centre operation 31 time rotational, Cycloidal Wheel 50 makes eccentric rotary also relative to the central shaft of power shaft, and the rotation direction of Cycloidal Wheel 50 is contrary with the rotation direction of off-centre operation 31.Wherein, more than the tooth of Cycloidal Wheel 50 one of the number of gear pin 52 in pin wheel housing 51, when eccentric shaft 30 rotates one week, Cycloidal Wheel 50 can rotate the angle of a tooth in opposite direction.Meanwhile, rotating driving eccentric shaft 30 around the central axis of Cycloidal Wheel 50 of Cycloidal Wheel 50, it is called revolution.
Finally, eccentric shaft 30 is connected with output shaft, and is revolved round the sun and pass to output shaft.Visible, the one-level rotating speed N1 of eccentric shaft 30 input carries out second level deceleration through cycloidal-pin wheel assembly 5, is converted into the revolution rotating speed of eccentric shaft 30 outfan, is called that Second-Stage Rotating Speed is N2, and is exported by output shaft, forms output speed.Owing to the rotary middle spindle of Cycloidal Wheel 50 is coaxial with power shaft, then the rotary middle spindle of eccentric shaft 30 revolution is also coaxial with power shaft.As long as output shaft is coaxial with power shaft, then output speed is coaxial with the motor speed N0 of input.
Although this utility model discloses as above, but this utility model is not limited to this.Any those skilled in the art, without departing from, in spirit and scope of the present utility model, all making various changes or modifications, therefore protection domain of the present utility model should be as the criterion with claim limited range.
Claims (8)
1. the eccentric shaft drive mechanism for accurate retarding machine, including: there is the eccentric shaft of off-centre operation, capacity eccentric bearing and block bearing, described capacity eccentric bearing is set on described off-centre operation, and described block bearing is set on described eccentric shaft and adjacent with described off-centre operation；
Described block bearing includes: bearing inner race, the bearing outer ring being enclosed within outside described bearing inner race and the some rolling elements between described bearing inner race and bearing outer ring, being provided with rib at described bearing inner race axially towards one end of described off-centre operation, described rib surrounds described eccentric shaft all described rolling elements of backstop；
It is characterized in that, described rib and described capacity eccentric bearing axially in contact with.
2. eccentric shaft drive mechanism as claimed in claim 1, it is characterised in that in two end faces that described capacity eccentric bearing contacts with described rib, at least one end face is smooth flat.
3. eccentric shaft drive mechanism as claimed in claim 1, it is characterised in that described capacity eccentric bearing is retainer roller bearing, and described retainer roller bearing includes retainer, and described rib contacts at least partly with described retainer.
4. eccentric shaft drive mechanism as claimed in claim 3, it is characterised in that the external diameter of described rib is not less than twice and the retainer internal diameter sum of the eccentric throw corresponding to described off-centre operation.
5. eccentric shaft drive mechanism as claimed in claim 1, it is characterised in that described rib and described bearing inner race are formed in one.
6. eccentric shaft drive mechanism as claimed in claim 1, it is characterized in that, described off-centre operation is two, described capacity eccentric bearing is two, two described capacity eccentric bearings are respectively fitted over outside two described off-centre operations, described block bearing is two, and two described capacity eccentric bearings are between two described block bearings, and the described rib of each described block bearing contacts vertically at least partly with adjacent described capacity eccentric bearing.
7. eccentric shaft drive mechanism as claimed in claim 1, it is characterised in that described block bearing is taper roll bearing.
8. an accurate retarding machine, it is characterised in that include the eccentric shaft drive mechanism described in any one of claim 1～7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620125100.1U CN205371555U (en) | 2016-02-17 | 2016-02-17 | Accurate speed reducer and eccentric shaft drive mechanism thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620125100.1U CN205371555U (en) | 2016-02-17 | 2016-02-17 | Accurate speed reducer and eccentric shaft drive mechanism thereof |
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| Publication Number | Publication Date |
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| CN205371555U true CN205371555U (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620125100.1U Active CN205371555U (en) | 2016-02-17 | 2016-02-17 | Accurate speed reducer and eccentric shaft drive mechanism thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529559A (en) * | 2018-05-25 | 2019-12-03 | 昆山光腾智能机械有限公司 | Needle tooth cycloidal reducer and industrial robot |
-
2016
- 2016-02-17 CN CN201620125100.1U patent/CN205371555U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529559A (en) * | 2018-05-25 | 2019-12-03 | 昆山光腾智能机械有限公司 | Needle tooth cycloidal reducer and industrial robot |
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