CN207421264U - A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mold for producing the gear ring body - Google Patents
A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mold for producing the gear ring body Download PDFInfo
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- CN207421264U CN207421264U CN201720693360.3U CN201720693360U CN207421264U CN 207421264 U CN207421264 U CN 207421264U CN 201720693360 U CN201720693360 U CN 201720693360U CN 207421264 U CN207421264 U CN 207421264U
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- gear ring
- ring body
- gear
- grinding tooth
- punch
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Abstract
The utility model is related to a kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the molds for producing the gear ring body, the gear ring body includes the ring body of single type entirety, the first gear ring and the second gear ring that are formed in the ring body surface is made by powdered metallurgical material, and first gear ring, the second gear ring are arranged along the axial direction of the ring body；The density of the gear ring body is less than 92% theoretical density, and every cubic millimeter of quality is 6.0~8.0 grams.Implement the utility model, the gear ring body can with one-pass molding with two-stage gear ring, two-stage gear ring has preferable concentricity.
Description
【Technical field】
The utility model is related to gear technique field more particularly to a kind of gear ring body and mechanical reduction gears.
【Background technology】
The ring gear of the first order epicyclic train of traditional two-stage mechanical reduction gear and second level epicyclic train
Ring gear is typically what is be fabricated separately, usually first carries out two-stage gear ring body respectively, is then added respectively by way of turning again
Work, which goes out, couples position, connects two-stage gear ring body by connector such as attachment screw or connecting pin etc. again afterwards.This kind of mode system
The ring gear made need to carry out secondary operation and subsequent mechanical connection, of high cost, and easily occur in making or assembling process
Eccentric phenomena.
【The content of the invention】
One purpose of the utility model is the concentricity for improving gear ring body.
The utility model first aspect provides a kind of gear ring body, including sintering single type entirety by powdered metallurgical material
Ring body, the first gear ring and the second gear ring for being formed in the ring body surface, first gear ring, the second gear ring edge
The axial direction arrangement of the ring body；92% of the density of the gear ring body less than theoretical density, and every cubic millimeter
Quality is 6.0~8.0 grams.
As a kind of improvement of the utility model, the quality of every cubic millimeter of the gear ring body is 6.2~7.2 grams.
As a kind of improvement of the utility model, first gear ring and the second gear ring are all located at the ring body
Inner peripheral surface or the outer surface for being all located at the ring body；First gear ring has the first grinding tooth, second tooth
Circle has the second grinding tooth.
As a kind of improvement of the utility model, first grinding tooth is helical teeth, and second grinding tooth is straight-tooth.
As a kind of improvement of the utility model, first grinding tooth is straight-tooth, and second grinding tooth is helical teeth.
As a kind of improvement of the utility model, the spiral angle of the helical teeth is 10 ° -30 °, is preferably 20 degree.
As a kind of improvement of the utility model, first grinding tooth and the second grinding tooth are all helical teeth, and inclined direction phase
Instead.
As a kind of improvement of the utility model, first grinding tooth and the second grinding tooth are all helical teeth, and inclined direction phase
Together.
As a kind of improvement of the utility model, the space width of first grinding tooth and the space width of the second grinding tooth not phase
Deng.
Alternatively, the space width of first grinding tooth and the space width of the second grinding tooth can also be equal.
As a kind of improvement of the utility model, the number of teeth and the number of teeth of the second grinding tooth of first grinding tooth differ.
Alternatively, the number of teeth of first grinding tooth and the number of teeth of the second grinding tooth can also be identical.
As a kind of improvement of the utility model, the tooth of first grinding tooth is high unequal with the tooth height of the second grinding tooth.
Alternatively, the tooth of first grinding tooth is high can also be equal with the tooth height of the second grinding tooth.
As a kind of improvement of the utility model, the inner peripheral surface of the end of the gear ring body is integrally formed with installation
Recess, the recess offer connecting hole, and the connecting hole runs through the side wall of the ring body, the recess and described first
Grinding tooth and/or the second grinding tooth are least partially overlapped in the axial direction of the ring body.
As a kind of improvement of the utility model, the axial end portion of the recess and first grinding tooth and/or second
The axial end portion of grinding tooth is concordant.
As a kind of improvement of the utility model, gear ring body one-pass molding in same die cavity, so that described
The ring body of gear ring body is in corresponding first gear ring and the junction gapless of the second gear ring.
As a kind of improvement of the utility model, gear ring body one-pass molding in same die cavity, so that described
The outer surface of gear ring body is smooth.
As a kind of improvement of the utility model, there is hole, the hole between the powder metallurgy particle of the gear ring body
The longest edge of gap is away from no more than 0.2 millimeter.
Mechanical reduction gear can be used in the gear ring body that the utility model first aspect provides, which includes
Mounted on the in vivo first order epicyclic train of gear ring and second level epicyclic train, the first order epicyclic train includes the
One sun gear, around first sun gear the first planetary gear set and driven by the revolution of first planetary gear set
First pivoted frame；The planetary gear of first planetary gear set simultaneously with first sun gear, the first tooth of gear ring body inner peripheral surface
Circle is meshed.The second level epicyclic train includes the second sun gear, the second planetary gear set around second sun gear
And the second pivoted frame driven by the revolution of second planetary gear set；The planetary gear of second planetary gear set simultaneously with institute
State the second sun gear, the second gear ring of gear ring body is meshed.
The utility model also provide it is a kind of for producing the mold of gear ring body as described above, the mold include middle mould, on
Punch die and lower punch, for middle mold there are one die cavity, lower punch includes next punch die and the following two punch being set in next punch die
Mould, upper trimming die include a upper punch die and upper two punch die being set in a punch die, the outer diameter of next punch die and a upper punch die
Outer diameter matched with the internal diameter of the die cavity of middle mould, the outer diameter of the outer diameter of following two punch mould and upper two punch die is equal, following two punch mould and upper
External-toothing is respectively provided on two punch dies.
As a kind of improvement of the utility model, the outer surface of upper two punch die and the inner surface of a upper punch die are set tiltedly
Tooth, the outer surface of the following two punch mould and the inner surface of next punch die set straight-tooth.
The gear ring body of the utility model is by the disposable compacting sintering of powdered metallurgical material into the entirety of single type, the first gear ring
It is not required to be assembled with the second gear ring, is not required to carry out secondary operation, reduces cost, improve the first gear ring and the second gear ring
Concentricity.
【Description of the drawings】
Fig. 1 is a kind of schematic diagram for gear ring body that the utility model first embodiment provides；
Fig. 2 is the schematic cross-sectional view of gear ring body shown in Fig. 1；
Fig. 3 is a kind of schematic cross-sectional view for gear ring body that the utility model second embodiment provides；
Fig. 4 is a kind of schematic cross-sectional view for gear ring body that the utility model 3rd embodiment provides；
Fig. 5 is a kind of schematic cross-sectional view for gear ring body that the utility model fourth embodiment provides；
Fig. 6 is the schematic diagram for the gear ring body that the 5th embodiment of the utility model provides, the first gear ring of the gear ring body and the
Two gear rings are respectively integrally formed with connecting flange position；
Fig. 7 is the first gear ring of gear ring body shown in Fig. 6 and the second gear ring cuing open integrally formed with connecting flange position respectively
Depending on schematic diagram；
Fig. 8 is the first gear ring of gear ring body shown in Fig. 6 and the schematic cross-sectional view of the second gear ring difference connecting flange；
Fig. 9 is the schematic diagram of the first gear ring shown in Fig. 8 and the flange of the second gear ring connection；
Figure 10 is the schematic cross-sectional view of the body formed mold of gear ring shown in Fig. 1；
Figure 11 is the schematic cross-sectional view using the mechanical reduction gear of the gear ring body of the utility model.
【Specific embodiment】
The utility model will be further described with reference to the accompanying drawings and examples.
With reference to figure 1 and Fig. 2, a kind of gear ring body 100 made of powdered metallurgical material provided by the utility model, gear ring body
There is thin-and-long hole, the longest edge of the thin-and-long hole is away from no more than 0.2 millimeter between 100 powder metallurgy particle.Institute
Stating gear ring body 100 includes ring body, the first gear ring 10 and the second gear ring 20 for being connected to 10 one end of the first gear ring.The ring
Shape body, the first gear ring 10 and the second gear ring 20 are integrally formed, the first gear ring 10 and the second gear ring 20 include several grinding tooths 11,
21, the grinding tooth 11,21 of two-stage gear ring is formed in the inner peripheral surface of the ring body.First gear ring 10 and second of this kind design
Gear ring 20 is not required to be assembled, and on the one hand can avoid the secondary operation of the first gear ring 10 and the second gear ring 20, reduce gear ring body
100 axial length, reduces cost, on the other hand avoids in the production process or the bias that occurs of when assembly defect shows
As ensure that the concentricity of the first gear ring 10 and the second gear ring 20.
Preferably, the 92% of the theoretical density that the density of gear ring body 100 is less than, every cubic millimeter of quality for 6.0~
8.0 grams, more preferably between 6.2~7.2 grams.
The inner peripheral surface of first gear ring 10 is integrally formed with the first grinding tooth 11.The inner peripheral surface of second gear ring 20 is integrally formed
There is the second grinding tooth 21.Preferably, the inner end of the first grinding tooth 11 is connected with the inner end of the second grinding tooth 21, the outer end of the first grinding tooth 11 with
The end of first gear ring 10 is concordant, and the outer end of the second grinding tooth 21 is concordant with the end of the second gear ring 20.Alternatively,
The inner end of first grinding tooth 11 can not also be connected with the inner end of the second grinding tooth 21, but be spaced a distance in the axial direction, i.e., and
One section of not toothed step is additionally provided between the inner end of one grinding tooth 11 and the inner end of the second grinding tooth 21, the inner surface of the step is
Smooth surface.
In the present embodiment, the first grinding tooth 11 is identical with the number of teeth of the second grinding tooth 21, space width is equal and tooth is high equal.It can
With understanding, the number of teeth of the first grinding tooth 11 and the second grinding tooth 21 can also be that different or space width can also be not phase
Deng or tooth height can also be unequal.It can be made choice according to actual conditions.The cross sectional shape of first grinding tooth 11
And/or second the cross sectional shape of grinding tooth 21 be involute or such as triangle, rectangle, trapezoidal.
In the present embodiment, the first grinding tooth 11 is helical teeth.The spiral angle of helical teeth is 10 ° -30 °, is preferably 20 °；Second nibbles
Tooth 21 is straight-tooth, and the axial length of the first grinding tooth 11 is less than the axial length of the second grinding tooth 21.
It is to be appreciated that the first grinding tooth 11 and the second grinding tooth 21 also have other configurations scheme.
As shown in figure 3, in the present embodiment, the first grinding tooth 11 is straight-tooth.Second grinding tooth 21 is helical teeth.The spiral angle of helical teeth
It it is preferably 20 ° for 10 ° -30 °, the axial length of the first grinding tooth 11 is less than the axial length of the second grinding tooth 21.
As shown in figure 4, in the present embodiment, the first grinding tooth 11 and the second grinding tooth 21 are all helical teeth, the helical angle of two helical teeth
The identical and hand of spiral is spent on the contrary, the axial length of the first grinding tooth 11 is less than the axial length of the second grinding tooth 21.It is appreciated that
Ground, the axial length of the first grinding tooth 11 can also be more than the axial length of the second grinding tooth 21.
As shown in figure 5, in the present embodiment, the first grinding tooth 11 and the second grinding tooth 21 are all helical teeth, two helical teeth inclined directions
Identical, simply spiral angle differs.The spiral angle of first grinding tooth 11 is more than the spiral angle of the second grinding tooth 21, and first nibbles
The axial length of tooth 11 is less than the axial length of the second grinding tooth 21.It should be understood that the spiral angle of the first grinding tooth 11 can also
Less than the spiral angle of the second grinding tooth 21, the axial length of the first grinding tooth 11 can also be more than the axial length of the second grinding tooth 21.
It is to be appreciated that the first gear ring 10, the second gear ring 20 can be all disposed within the outer surface of ring body；Or point
Outer surface, the inner peripheral surface of ring body are not arranged on.
It is to be appreciated that the first grinding tooth 11, the quantity of the second grinding tooth 21, tooth height can be identical or differ.First tooth
The tooth socket of circle 10 can be alignd with the tooth socket of the second grinding tooth 21, connected, and can not also be alignd or not connected.
Preferably, the density of gear ring body 100 is less than 92% theoretical density, and every cubic millimeter of quality is 6.0~8.0
Gram, in order to one-pass molding gear ring body, i.e. the first gear ring 10 and its first grinding tooth 11, the second gear ring 20 and its second grinding tooth 21
Single type is formed in single treatment whole, so as to accelerate manufacture efficiency, and ensured the first gear ring 10, the second gear ring 20
Concentricity.The density of gear ring body 100 can be uniform or non-uniform.
With reference to figure 6 and Fig. 7, in another embodiment of the utility model, the first gear ring 10 and the second gear ring 20 are also distinguished
Integrally formed with the position of connecting flange.Specifically, the inner peripheral surface of the first gear ring 10 is also integrally formed with multiple first recess
12.First recess 12 extends to the end of the first gear ring 10.Tooth socket of the bottom of first recess 12 preferably with the first grinding tooth 11
Bottom is concordant.First through hole 13 can be opened up in the first recess 12, first through hole 13 runs through the side wall of the first gear ring 10.Similarly,
The other end of gear ring body 100 i.e. the second gear ring 20 sets the second recess 22 and the second through hole 23.Preferably, the first recess 12 and second
The cross sectional shape of recess 22 is all small trapezoidal, the convenient and flange assembling of outer imperial palace.In the present embodiment, the first recess 12 and
Two recess 22 are all four, and four the first recess, 12, four the second recess 22 are uniformly distributed circumferentially.
First gear ring 10 and the second gear ring 20 are in specific connecting flange, as shown in Figure 8 and Figure 9, will be with the first gear ring 10
The flange of connection is defined as first flange 30, and the flange being connected with the second gear ring 20 is defined as second flange 40.
First flange 30 includes first flange body 31 and the first mounting portion for being formed in 31 one end of first flange body
32, the first mounting portion 32 can be tucked into the opening of gear ring body 100.First flange body 31 has the first axial centre bore
311, it is passed through for drive shaft or driven shaft.First mounting portion 32 is preferably ring-type, and outer surface is equipped with multiple first convex blocks
33.Each first convex block 33 is adapted with corresponding first recess 12 of the first gear ring 10.First convex block 33 is equipped with shrinkage pool 34 and the
The first through hole 13 of one recess 12 is alignd, so that pin member passes through to link together the first gear ring 10, first flange 30.
It, may there are burrs because first through hole 13 drills out.For this purpose, the first convex block 33 is at corresponding shrinkage pool 34
It is interfered equipped with depressed area to avoid burr and the first convex block 33, in the present embodiment, which is a vertical slots 331.
When first flange 30 is connected with the first gear ring 10, due to the vertical slots 331 set on the first convex block 33, the first gear ring 10
Bottom of the burr of first through hole 13 not with vertical slots 331 contacts, so that the burr in first through hole 13 is located at vertical slots 331
It is interior, will not be exposed, the installation of the fasteners such as pin member is not interfered with, is firmly installed.
The structure of second flange 40 is similar with first flange 30, including second flange body 41 and is formed in second flange
Second mounting portion 42 of 41 one end of body.Second flange body 41 has the second axial centre bore 411, is passed through for driven shaft.
Second mounting portion 42 is preferably ring-type, and outer surface is equipped with multiple second convex blocks 32.Second convex block 32 is logical corresponding second
The position in hole 23 is additionally provided with depressed area, such as vertical slots 431.
Figure 10 is the mold 200 used in the gear ring body 100 of shaping the utility model.The mold 200 includes middle mould 50, upper punching
Mould and lower punch.There are one die cavitys for the middle tool of mould 50.Under lower punch includes next punch die 51 and is set in next punch die 51
Two punch dies 52.Upper trimming die includes a upper punch die 53 and upper two punch die 54 being set in a punch die 53.Next punch die 51
Outer diameter, the outer diameter of a upper punch die 53 are matched with the internal diameter of the die cavity 501 of middle mould 50.The outer diameter of following two punch mould 52 and upper two punch die
54 outer diameter is equal.External-toothing is respectively provided on following two punch mould 52 and upper two punch die 54.Gear ring body 100 is the die cavity in middle mould 50
Powder compression moulding is disposably filled out in 501.Molding temperature can be room temperature or a little higher than room temperature (<200℃).
In pressing process, upper two punch die 54 can enter to the inner default position of die cavity 501 of middle mould 50 and by following two punch
Mould 52 ejects a distance outward, a upper punch die 53 can be threaded into during powder metallurgy pressing in die cavity 501 from
And the powder metallurgy of filling is suppressed, upper trimming die and lower punch are demoulded successively respectively after the completion of compacting, gear ring body
100 i.e. shaping completes.
Preferably, the outer surface of upper two punch die 54 can set helical teeth, and tooth form is corresponding with the first grinding tooth 11.A upper punch die 53
Inner surface can also set helical teeth and be engaged with the helical teeth on upper two punch die 54.
The inner surface of next punch die 51 can set straight-tooth or helical teeth, and the outer surface of following two punch mould 52 can set straight-tooth or helical teeth.
Gear ring body 100 in the utility model, using powder metallurgy in a die cavity compression moulding, production technology
It is simple and reliable；Moreover, the ring body of the gear ring body come is suppressed in the junction of corresponding first gear ring and the second gear ring without connecing
Trace, the outer surface of ring body is smooth surface, and there is no lines of demarcation.
Gear ring body can be pressed into next time in relatively low temperature (such as less than 200 degree) condition, in the case of this kind, sintering
The longest edge of hole between the powder metallurgy particle of gear ring body 100 afterwards is away from no more than 0.2 millimeter, the density of gear ring body 100
Less than the 92% of theoretical density.
With reference to figure 11, for the mechanical reduction gear 300 of the gear ring body of application the utility model.The mechanical reduction gear 300
Including gear ring body 100, first order epicyclic train 210 and second level epicyclic train 220.210 He of first order epicyclic train
Second level epicyclic train 220 is located in gear ring body 100.Gear ring body 100 includes the first gear ring 10 and the second gear ring 20.First
The inner peripheral surface of gear ring 10 has the first grinding tooth 11.The inner peripheral surface of second gear ring 20 has the second grinding tooth 21.
First order epicyclic train 210 includes the first sun gear 211, the first planetary gear set 212 and the first pivoted frame 213.
The outer surface of first sun gear 211 has the first external tooth.Each planetary gear of first planetary gear set 212 simultaneously with outside first
Tooth, the first grinding tooth 11 be meshed.In this way, when the first sun gear 211 rotates, each planetary gear of the first planetary gear set 212 will be certainly
Turn, and revolve round the sun generally about the first sun gear 211 to drive the first pivoted frame 213.
Second level epicyclic train 220 includes the second sun gear 221, the second planetary gear set 222 and the second pivoted frame 223.
Second sun gear 221 is fixedly installed in the first pivoted frame 213 and can be rotated integrally with the first pivoted frame 213.Outside second sun gear 221
Perimeter surface has the second external tooth.Each planetary gear of second planetary gear set 222 is nibbled simultaneously with the second external tooth, 21 phase of the second grinding tooth
It closes.When second sun gear 221 rotates, each planetary gear of the second planetary gear set 222 is by rotation, and generally about second sun
Wheel 221 revolves round the sun to drive the second pivoted frame 223.Due to applying the gear ring body 100 of the utility model, the mechanical reduction gear
300 axial dimension reduces, and concentricity is preferable, compact-sized, and work efficiency is high.
Above example only expresses the preferred embodiment of the utility model, and description is more specific and detailed, but simultaneously
Cannot the limitation to the utility model patent scope therefore be interpreted as.It should be pointed out that the ordinary skill for this field
For personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, such as to each implementation
Different characteristic in example is combined, these belong to the scope of protection of the utility model.
Claims (11)
1. a kind of gear ring body, which is characterized in that including the ring body of single type entirety is made of powdered metallurgical material, is formed in
First gear ring and the second gear ring on the ring body surface, first gear ring, the second gear ring are along the ring body
Axial alignment；The density of the gear ring body is less than the 92% of theoretical density, and every cubic millimeter of quality is 6.0~8.0 grams.
2. gear ring body according to claim 1, which is characterized in that the quality of every cubic millimeter of the gear ring body for 6.2~
7.2 gram.
3. gear ring body according to claim 1, which is characterized in that first gear ring and the second gear ring are all located at described
The inner peripheral surface of ring body or the outer surface for being all located at the ring body, first gear ring have the first grinding tooth,
Second gear ring has the second grinding tooth.
4. gear ring body according to claim 3, which is characterized in that first grinding tooth is helical teeth, and second grinding tooth is
Straight-tooth, the spiral angle of the helical teeth is 10 ° -30 °.
5. gear ring body according to claim 3, which is characterized in that first grinding tooth and the second grinding tooth are all helical teeth, and
Inclined direction is opposite or identical.
6. gear ring body according to claim 3, which is characterized in that the inner peripheral surface of the end of the gear ring body is integrally formed
There is the recess of installation, the recess offers connecting hole, and the connecting hole runs through the side wall of the ring body, the recess
It is least partially overlapped in the axial direction of the ring body with first grinding tooth and/or the second grinding tooth.
7. gear ring body according to claim 6, which is characterized in that the axial end portion of the recess and first grinding tooth
And/or second grinding tooth axial end portion it is concordant.
8. gear ring body according to claim 1, which is characterized in that gear ring body one-pass molding in same die cavity,
So that the ring body of the gear ring body is in corresponding first gear ring and the junction gapless of the second gear ring.
9. a kind of mechanical reduction gear, including first order epicyclic train and second level epicyclic train, the first order planet
Gear train includes the first sun gear, around the first planetary gear set of first sun gear and by first planetary gear set
The first pivoted frame for revolving round the sun and driving；The second level epicyclic train includes the second sun gear, around second sun gear
Second planetary gear set and the second pivoted frame driven by the revolution of second planetary gear set, which is characterized in that further include power
Profit requires the gear ring body described in 1, and the first order epicyclic train and second level epicyclic train are located in the gear ring body；Institute
It states the planetary gear of the first planetary gear set while is meshed with the first gear ring of first sun gear, gear ring body inner peripheral surface, institute
It states the planetary gear of the second planetary gear set while is meshed with the second gear ring of second sun gear, gear ring body.
It is 10. a kind of for producing the mold of gear ring body as described in claim 1, which is characterized in that the mold include middle mould, on
Punch die and lower punch, for middle mold there are one die cavity, lower punch includes next punch die and the following two punch being set in next punch die
Mould, upper trimming die include a upper punch die and upper two punch die being set in a punch die, the outer diameter of next punch die and a upper punch die
Outer diameter matched with the internal diameter of the die cavity of middle mould, the outer diameter of the outer diameter of following two punch mould and upper two punch die is equal, following two punch mould and upper
External-toothing is respectively provided on two punch dies.
11. mold according to claim 10, which is characterized in that the outer surface of upper two punch die and a upper punch die it is interior
Surface sets helical teeth, and the outer surface of the following two punch mould and the inner surface of next punch die set straight-tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720693360.3U CN207421264U (en) | 2017-06-14 | 2017-06-14 | A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mold for producing the gear ring body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720693360.3U CN207421264U (en) | 2017-06-14 | 2017-06-14 | A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mold for producing the gear ring body |
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| CN207421264U true CN207421264U (en) | 2018-05-29 |
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| CN201720693360.3U Active CN207421264U (en) | 2017-06-14 | 2017-06-14 | A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mold for producing the gear ring body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763171A (en) * | 2016-08-22 | 2018-03-06 | 德昌电机(深圳)有限公司 | A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mould for producing the gear ring body |
| CN112392921A (en) * | 2020-12-03 | 2021-02-23 | 福建思普计量检测科技有限公司 | Variable-speed transmission mechanism |
-
2017
- 2017-06-14 CN CN201720693360.3U patent/CN207421264U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763171A (en) * | 2016-08-22 | 2018-03-06 | 德昌电机(深圳)有限公司 | A kind of gear ring body, the mechanical reduction gear comprising the gear ring body and the mould for producing the gear ring body |
| CN112392921A (en) * | 2020-12-03 | 2021-02-23 | 福建思普计量检测科技有限公司 | Variable-speed transmission mechanism |
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