CN208534827U - Gear shaft, rotating shaft assembly and compressor - Google Patents
Gear shaft, rotating shaft assembly and compressor Download PDFInfo
- Publication number
- CN208534827U CN208534827U CN201821286694.XU CN201821286694U CN208534827U CN 208534827 U CN208534827 U CN 208534827U CN 201821286694 U CN201821286694 U CN 201821286694U CN 208534827 U CN208534827 U CN 208534827U
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- axle portion
- installation position
- gear shaft
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- 238000009434 installation Methods 0.000 claims abstract description 36
- 230000013011 mating Effects 0.000 claims description 57
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000002146 bilateral effect Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 20
- 239000010687 lubricating oil Substances 0.000 description 4
- 241001400675 Sympodium Species 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model provides a gear shaft, pivot subassembly and compressor, wherein the gear shaft includes the axial region and sets up at an axial end of axial region and along the preceding bearing installation position, gear portion and the back bearing installation position that the axial of axial region arranged in proper order, gear portion and axial region integrated into one piece. The gear portion and the axial region integrated into one piece of gear shaft have reduced spare parts such as key, axial positioning piece, compare with prior art, the utility model discloses a stable transmission can be realized to two bearings of gear shaft only need be installed, has simplified the structure of gear shaft, has improved the assembly precision and the assembly efficiency of gear shaft simultaneously.
Description
Technical field
The utility model relates to rotate machinery equipment field, specifically, being to be related to a kind of gear shaft and there is the tooth
The runner assembly and compressor of wheel shaft.
Background technique
Determine frequency centrifugal compressor and generallys use what the gear wheel being fixed on motor shaft was engaged with the helical gear on gear shaft
Mode transmits torque.Centrufugal compressor impeller is fixed on gear shaft, is rotated with gear shaft, is done work to medium.Work as centrifugal compressed
When machine works normally, gear shaft will receive forward axial force, and helical teeth can provide axial force backward, to offset a part forward
Axial force.Under start and stop and different operating conditions, the axial force of gear shaft is of different sizes and direction is different.For example starting
When, in the case where not setting up pressure difference, gear shaft is mainly the axial force of helical teeth bring backward；After differential pressure is established, gear shaft
Axial resultant force is forward.So the existing radial force of gear shaft, have forward axial force or axial force backward again, in order to balance in this way
Power, generally use individual transverse bearing and individual thrust bearing, and at least need two transverse bearings and two thrusts
Bearing, therefore the gear shaft at least needs the installation of four bearings to cooperate, the structure of such gear shaft just becomes very complicated.
Summary of the invention
The main purpose of the utility model is to provide the gear that a kind of structure is simple, assembly precision is high and assembly efficiency is high
Axis.
The another object of the utility model is to provide a kind of rotating assembly with said gear axis.
A further object of the utility model is to provide a kind of compressor with above-mentioned rotating assembly.
To realize above-mentioned main purpose, the utility model provides a kind of gear shaft, including axle portion and axle portion is arranged in
One axial end and the fore bearing installation position being sequentially arranged along the axial direction of axle portion, gear part and rear bearing installation position, gear part
For helical teeth structure, gear part and axle portion are integrally formed.
By above scheme as it can be seen that the gear part of gear shaft and axle portion are integrally formed, reduce key, axially position part etc. zero
Part, compared with prior art, the gear shaft of the utility model, which only needs to install two bearings, can be realized the stable of gear shaft
Transmission, simplifies the structure of gear shaft, while improving the assembly precision and assembly efficiency of gear shaft.
One Preferable scheme is that, radial load mating surface before being provided on fore bearing installation position, preceding radial load cooperation
Face is used to be cooperatively connected with combined journal and thrust bearing.Rear radial load mating surface is provided on rear bearing installation position, it is rear radial
Load mating surface is used to be cooperatively connected with transverse bearing.
Further embodiment is that fore bearing installation position is extended radially outward by axle portion and two from the peripheral wall of axle portion
Boss surrounds, and the side wall of two boss towards fore bearing installation positions is respectively provided with main mating surface and secondary mating surface, preceding radial load
Mating surface is arranged in axle portion and is located between main mating surface and secondary mating surface.
It can be seen that gear shaft is gone forward, radial load mating surface, rear radial load mating surface and main mating surface and pair are matched
The setting in conjunction face, so that gear shaft is simple and compact for structure.
One Preferable scheme is that, be respectively arranged with fixation hole on the front end face of axle portion and the rear end face of axle portion.
It can be seen that fixation hole is for lifting gear shaft.
To realize above-mentioned another object, the utility model provides a kind of rotating assembly, and rotating assembly includes that radial thrust is multiple
Sympodium holds, transverse bearing and gear shaft, and gear shaft includes axle portion and the axial end that axle portion is arranged in and along axle portion
Axial direction the fore bearing installation position, gear part and the rear bearing installation position that are sequentially arranged, gear part is helical teeth structure, gear part and axis
Portion is integrally formed, and combined journal and thrust bearing is mounted on fore bearing installation position, and transverse bearing is mounted on rear bearing installation position.
By above scheme as it can be seen that the gear part of gear shaft and axle portion are integrally formed, reduce key, axially position part etc. zero
Part, compared with prior art, the gear shaft of the utility model, which only needs to install two bearings, can be realized stable transmission, simplify
The structure of gear shaft, while improving the assembly precision and assembly efficiency of gear shaft.
One Preferable scheme is that, combined journal and thrust bearing includes Main thrust face, secondary thrust face and radial load carrying
Face.Fore bearing installation position is surrounded by axle portion and two from the boss that the peripheral wall of axle portion extends radially outward, two boss courts
Main mating surface and secondary mating surface are respectively provided with to the side wall of fore bearing installation position.Main mating surface and Main thrust face cooperate, pair cooperation
Face and secondary thrust face cooperate, and axle portion has the preceding radial load mating surface cooperated with radial load loading end, and preceding radial load is matched
Conjunction face is arranged in axle portion and is located between main mating surface and secondary mating surface.
It can be seen that gear shaft is gone forward, radial load mating surface, rear radial load mating surface and main mating surface and pair are matched
The setting in conjunction face, so that gear shaft is simple and compact for structure.
Further embodiment is the bilateral total backlash of preceding radial load mating surface and combined journal and thrust bearing radial fit
Width within the scope of 0.06 millimeter to 0.3 millimeter, between Main thrust face and main mating surface have the first gap, secondary thrust face and
There is the second gap, the sum of the width in the first gap and the second gap is in 0.06 millimeter to 0.4 millimeter range between secondary mating surface
It is interior.
It can be seen that the setting of each gap size will guarantee to form certain thickness oil film, to guarantee shaft group
Part being capable of stable operation.
One Preferable scheme is that, offer oil film wedge slot on Main thrust face, secondary thrust face and radial load loading end.
It can be seen that being arranged in the structure on axis relative to oil film wedge slot, Lubrication Film Thickness can be made to increase, bearing temperature drop
It is low, hold dirty ability and greatly promote, is conducive to rotor and runs steadily in the long term.Lubricating oil utilization rate improves, and improves thrust face confession
Oily ability.Bearing is not easy to be scratched and wear.
One Preferable scheme is that, combined journal and thrust bearing includes bearing body and fixing piece, and bearing body includes phase
To the upper half-and-half bearing and bottom half-bearing of setting, fixing piece links together upper half-and-half bearing and bottom half-bearing.
Further embodiment is that fixing piece includes screw and pin.Upper half-and-half bearing has and connects in bottom half-bearing split
Conjunction face, offers pin hole and upper bolt aperture on upper joint surface, upper pin hole and upper bolt aperture from upper joint surface vertically to
Upper extension.Bottom half-bearing has the lower joint surface with upper half-and-half bearing split, and upper joint surface and lower joint surface are adjacent, on lower joint surface
Lower pin hole and lower screw hole are offered, lower pin hole and lower screw hole extend from lower joint surface straight down, upper pin hole
It is oppositely arranged with lower pin hole, upper bolt aperture and lower screw hole are oppositely arranged.The ground setting of pin interference fit in upper pin hole and
In lower pin hole, screw sequentially passes through upper bolt aperture and lower screw hole and upper half-and-half bearing and bottom half-bearing links together.
Further scheme is that the quantity at least two of screw, multiple screws are separately positioned on the axis of bearing body
The left and right sides of line, pin is between multiple screws.
It can be seen that combined journal and thrust bearing uses split type structure, convenient for combined journal and thrust bearing to be assembled into
On gear shaft, while the high accuracy positioning of combined journal and thrust bearing is realized, to guarantee entire bearing sagittal plane cylindricity and two
The flatness of a thrust face.
To realize above-mentioned a further object, the utility model provides a kind of compressor, which includes above-mentioned shaft group
Part.
By above scheme as it can be seen that the gear part of gear shaft and axle portion are integrally formed, reduce key, axially position part etc. zero
Part, compared with prior art, the gear shaft of the utility model, which only needs to install two bearings, can be realized stable transmission, simplify
The structure of gear shaft, while improving the assembly precision and assembly efficiency of gear shaft.
Detailed description of the invention
Fig. 1 is the structure chart of the utility model gear shaft embodiment.
Fig. 2 is the cross-sectional view in Fig. 1 at A-A.
Fig. 3 is the cross-sectional view in Fig. 1 at B-B.
Fig. 4 is the cross-sectional view of the utility model rotating assembly embodiment.
Fig. 5 is the structural exploded view of combined journal and thrust bearing in the utility model rotating assembly embodiment.
Fig. 6 is the structure chart of combined journal and thrust bearing in the utility model rotating assembly embodiment.
The following is a further explanation of the present invention with reference to the accompanying drawings and embodiments.
Specific embodiment
Referring to Fig. 1 to Fig. 4, on the compressor, which includes radial thrust for the rotating assembly application of the present embodiment
Composite bearing 2, transverse bearing 3 and gear shaft 1.Gear shaft 1 includes axle portion 11 and the axial end that axle portion 11 is arranged in
And be sequentially arranged along the axial direction of axle portion 11, fore bearing installation position 12, gear part 13 and rear bearing installation position 14, gear shaft is also
Part fixed bit 10 including another axial end of axle portion 11 is arranged in, part fixed bit 10 are used to install the leaf of compressor
Wheel.Combined journal and thrust bearing 2 is mounted on fore bearing installation position 12, and transverse bearing 3 is mounted on rear bearing installation position 14.Tooth
Wheel portion 13 and axle portion 11 are integrally formed, and gear part 13 is helical teeth structure.When the helical teeth of gear wheel and gear part 13 on motor shaft
After engagement, gear shaft 1 can be offset a part of forward axial force by a component backward.
Combined journal and thrust bearing 2 includes Main thrust face 21, secondary thrust face 22 and radial load loading end 23.Fore bearing peace
The boss 15,16 that dress position 12 is extended radially outward by axle portion 11 and two from the peripheral wall of axle portion 11 surrounds, 15 direction of boss
There is main mating surface 151, boss 16 is towards having pair on the side wall of fore bearing installation position 12 on the side wall of fore bearing installation position 12
Mating surface 161.Main mating surface 151 cooperates with Main thrust face 21, and secondary mating surface 161 cooperates with secondary thrust face 22, and axle portion 11 also has
There is the preceding radial load mating surface 17 with the cooperation of the radial load loading end 23 of combined journal and thrust bearing 2, preceding radial load is matched
Conjunction face 17 is arranged on the fore bearing installation position 12 of axle portion 11 and is located between main mating surface 151 and secondary mating surface 161.Main cooperation
The diameter d3 of radial load mating surface 17 before the diameter d1 in the face 151 and diameter d2 of secondary mating surface 161 is all larger than, diameter d1 and straight
The size of diameter d2 can be the same or different, and diameter d1 and diameter d2 are in the range of 60 millimeters to 200 millimeters, diameter d3
In the range of 30 millimeters to 120 millimeters.
There is the first gap between Main thrust face 21 and main mating surface 151, offer oil film wedge slot 211 on Main thrust face 21,
Multiple oil film wedge slots 211 radial arrangement centered on the central axis of combined journal and thrust bearing 2 is stored in oil film wedge slot 211
Lubricating oil, for forming oil film on Main thrust face 21, the oil film is for bearing forward axial force.Secondary thrust face 22 and pair are matched
There is the second gap between conjunction face 161, oil film wedge slot 221 is offered on secondary thrust face 22, multiple oil film wedge slots 221 are multiple with radial thrust
Sympodium holds radial arrangement centered on 2 central axis, and the lubricating oil in oil film wedge slot 221 is used to form oil on secondary thrust face 22
Film, the oil film are used to bear axial force backward.The sum of the width in the first gap and the second gap is at 0.06 millimeter to 0.4 millimeter
In range.
Transverse bearing 3 has radial load loading end 31, is provided with and radial load loading end on rear bearing installation position 14
The rear radial load mating surface 18 of 31 cooperations.The radial load loading end 23 of combined journal and thrust bearing 2 and the diameter of transverse bearing 3
Oil film wedge slot 231 is offered on load-bearing face 31, the lubricating oil in oil film wedge slot 231 is used in 23 He of radial load loading end
Oil film is formed on radial load loading end 31, which can be that simgle oil wedge structure can also for bearing radial force, oil film wedge slot 231
Think multi-oil wedge floating-ring structure.
Preceding radial load mating surface 17 and the width t1 of the bilateral total backlash of 2 radial fit of combined journal and thrust bearing exist
Within the scope of 0.06 millimeter to 0.3 millimeter, the width of rear radial load mating surface 18 and the bilateral total backlash of 3 radial fit of transverse bearing
T2 is spent within the scope of 0.06 millimeter to 0.3 millimeter, and width t1 and the size of width t2 can be the same or different.
Fixation hole is respectively arranged on the front end face of axle portion 11 and the rear end face of axle portion 11.Preferably, which is spiral shell
Pit 19.Threaded hole 19 is for lifting gear shaft 1.
Referring to fig. 4 to Fig. 6, combined journal and thrust bearing 2 uses split type structure.Combined journal and thrust bearing 2 includes axis
Holding ontology, two pins 5 and two screws 4, two screws 4 are separately positioned on the left and right sides of the axis of bearing body, and two
Pin 5 is also set, respectively on the left and right sides of the axis of bearing body.Two pins 5 are mutual along a diameter of bearing body
Parallel is arranged in juxtaposition, and each pin 5 extends perpendicularly to the diameter.Bearing body axis is being parallel in the present embodiment
Direction on, pin 5 is located at the middle position of bearing body.Two pins 5 are located between two screws 4.
Bearing body includes the upper half-and-half bearing 201 and bottom half-bearing 202 being oppositely arranged.Upper half-and-half bearing 201 has and lower half
The upper joint surface 2010 of 202 split of bearing offers pin hole 2011 and upper bolt aperture 2012, upper pin on upper joint surface 2010
Nail hole 2011 and upper bolt aperture 2012 extend from upper joint surface 2010 straight up.Bottom half-bearing 202 has and upper half-and-half bearing
The lower joint surface 2020 of 201 splits, upper joint surface 2010 is adjacent with lower joint surface 2020, offers lower pin on lower joint surface 2020
Nail hole 2021 and lower screw hole 2022, lower pin hole 2021 and lower screw hole 2022 prolong from lower joint surface 2020 straight down
It stretches, upper pin hole 2011 and lower pin hole 2021 are oppositely arranged, and upper pin hole 2011 and lower pin hole 2021 are blind hole.It is excellent
Selection of land, pin use outer diameter for 6 millimeters or 8 millimeters or 10 millimeters or 12 millimeters or 16 millimeters or 20 millimeters of internal screw thread cylinder
Pin.The interference fit of pin 5 ground is arranged in upper pin hole 2011 and lower pin hole 2021.
Upper bolt aperture 2012 and lower screw hole 2022 are oppositely arranged, and screw 4 sequentially passes through upper bolt aperture 2012 and lower screw
Hole 2022 links together upper half-and-half bearing 201 and bottom half-bearing 202.Sliding bearing further includes two washers (not shown), and two
A washer is respectively sleeved on two screws 4 and is separately mounted in two upper bolt apertures 2012, it is preferable that washer is spring pad
Circle.
Upper half-and-half bearing 201 also has upper half sagittal plane, upper half Main thrust face and upper half pair thrust face, and bottom half-bearing 202 is also
With lower half sagittal plane, lower half Main thrust face and lower half pair thrust face.Upper half-and-half bearing 201 is assemblied in axle portion with bottom half-bearing 202
Fore bearing installation position 12 on, realize axial high accuracy positioning and lateral high accuracy positioning using pin 5, upper half-and-half bearing 201 with
The faying face of bottom half-bearing 202 realizes radial high accuracy positioning, then using spring washer, screw 4 by upper half-and-half bearing 201, under
Half-and-half bearing 202 is locked together.After locking, the upper half sagittal plane of upper half-and-half bearing 201 is enclosed with the lower half sagittal plane of bottom half-bearing 202
At complete radial load loading end 23；The upper half pair thrust face of upper half-and-half bearing 201 and the lower half pair thrust face of bottom half-bearing 202
Piece together complete secondary thrust face 22；The upper half Main thrust face of upper half-and-half bearing 201 and the lower half Main thrust face of bottom half-bearing 202 are spelled
Synthesize complete Main thrust face 21.
The compressor of the present embodiment includes the rotating assembly of the present embodiment.
Therefore the gear part of gear shaft and axle portion are integrally formed, and reduce the components such as key, axially position part, with
The prior art is compared, and the gear shaft of the utility model, which only needs to install two bearings, can be realized stable transmission, simplifies tooth
The structure of wheel shaft, while improving the assembly precision and assembly efficiency of gear shaft.Oil film wedge slot is arranged in radial thrust composite shaft
On the Main thrust face that holds and secondary thrust face, and be arranged suitable axial thrust gap Lubrication Film Thickness can be made to increase, bearing temperature
Degree reduces, and holds dirty capability improving, guarantees that rotor can be run steadily in the long term, bearing thrust face is not easy to be scratched, wear.Sliding bearing
Bearing is made by installing pin in the upper pin hole of upper half-and-half bearing and the lower pin hole of bottom half-bearing using split type structure
Then two half-and-half bearings are locked together, to guarantee entire bearing by the high accuracy positioning on tri- directions X, Y, Z by screw
Sagittal plane cylindricity, the flatness of two thrust faces.
Finally, it should be noted that the utility model is not limited to above-mentioned embodiment, if the ordinary skill of this field
Personnel are enlightened by it, without deviating from the purpose of the present invention, are not inventively designed and the technical side
The similar frame mode of case and embodiment, should all fall within the claims of the utility model.
Claims (12)
1. gear shaft, it is characterised in that: including axle portion and an axial end of the axle portion is arranged in and along the axle portion
Axial direction the fore bearing installation position, gear part and the rear bearing installation position that are sequentially arranged, the gear part is helical teeth structure, the tooth
Wheel portion and the axle portion are integrally formed.
2. gear shaft according to claim 1, it is characterised in that:
Radial load mating surface before being provided on the fore bearing installation position, the preceding radial load mating surface are used to push away with radial
Power composite bearing is cooperatively connected；
Rear radial load mating surface is provided on the rear bearing installation position, the rear radial load mating surface is used for and radial axle
Hold mating connection.
3. gear shaft according to claim 2, it is characterised in that:
It is enclosed by the boss that the axle portion and two are extended radially outward from the peripheral wall of the axle portion fore bearing installation position
At, two boss towards being respectively provided with main mating surface and secondary mating surface on the side wall of the fore bearing installation position, before described
Radial load mating surface is arranged in the axle portion and is located between the main mating surface and the secondary mating surface.
4. gear shaft according to any one of claims 1 to 3, it is characterised in that:
Fixation hole is respectively arranged on the front end face of the axle portion and the rear end face of the axle portion.
5. rotating assembly, which is characterized in that the rotating assembly includes combined journal and thrust bearing, transverse bearing and gear
Axis, the gear shaft include axle portion and the axial end that the axle portion is arranged in and are sequentially arranged along the axial direction of the axle portion
Fore bearing installation position, gear part and rear bearing installation position, the gear part is helical teeth structure, the gear part and the axle portion
It is integrally formed, the combined journal and thrust bearing is mounted on the fore bearing installation position, and the transverse bearing is mounted on described
On rear bearing installation position.
6. rotating assembly according to claim 5, it is characterised in that:
The combined journal and thrust bearing includes Main thrust face, secondary thrust face and radial load loading end；
It is enclosed by the boss that the axle portion and two are extended radially outward from the peripheral wall of the axle portion fore bearing installation position
At the side wall of two boss towards the fore bearing installation position is respectively provided with main mating surface and secondary mating surface；
The main mating surface and the Main thrust face cooperate, and the pair mating surface and the secondary thrust face cooperate, the axle portion tool
There is the preceding radial load mating surface with radial load loading end cooperation, the preceding radial load mating surface is arranged in the axis
In portion and it is located between the main mating surface and the secondary mating surface.
7. rotating assembly according to claim 6, it is characterised in that:
The width of the bilateral total backlash of the preceding radial load mating surface and the combined journal and thrust bearing radial fit exists
Within the scope of 0.06 millimeter to 0.3 millimeter, there is the first gap, the pair thrust between the Main thrust face and the main mating surface
There is the second gap, the sum of the width in first gap and second gap is in 0.06 milli between face and the secondary mating surface
Rice is within the scope of 0.4 millimeter.
8. rotating assembly according to claim 6 or 7, it is characterised in that:
Oil film wedge slot is offered on the Main thrust face, the secondary thrust face and the radial load loading end.
9. according to the described in any item rotating assemblies of claim 5 to 7, it is characterised in that:
The combined journal and thrust bearing includes bearing body and fixing piece, and the bearing body includes the upper semiaxis being oppositely arranged
It holds and bottom half-bearing, the fixing piece links together the upper half-and-half bearing and the bottom half-bearing.
10. rotating assembly according to claim 9, it is characterised in that:
The fixing piece includes screw and pin；
The upper half-and-half bearing has the upper joint surface with the bottom half-bearing split, offers pin hole on the upper joint surface
And upper bolt aperture, the upper pin hole and the upper bolt aperture extend from the upper joint surface straight up；
The bottom half-bearing has the lower joint surface with the upper half-and-half bearing split, and the upper joint surface and the lower joint surface are adjacent
It connects, offers lower pin hole and lower screw hole on the lower joint surface, the lower pin hole and the lower screw hole are described in
Lower joint surface extends straight down, and the upper pin hole and the lower pin hole are oppositely arranged, the upper bolt aperture and it is described under
Screw hole is oppositely arranged；
Pin interference fit ground is arranged in the upper pin hole and the lower pin hole, and the screw sequentially passes through described
Upper bolt aperture and the lower screw hole link together the upper half-and-half bearing and the bottom half-bearing.
11. rotating assembly according to claim 10, it is characterised in that:
The quantity at least two of the screw, multiple screws are separately positioned on the left and right sides of the axis of bearing body,
The pin is between multiple screws.
12. compressor, which is characterized in that the compressor includes the described in any item rotating assemblies of claim 5 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821286694.XU CN208534827U (en) | 2018-08-09 | 2018-08-09 | Gear shaft, rotating shaft assembly and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821286694.XU CN208534827U (en) | 2018-08-09 | 2018-08-09 | Gear shaft, rotating shaft assembly and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208534827U true CN208534827U (en) | 2019-02-22 |
Family
ID=65378016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821286694.XU Active CN208534827U (en) | 2018-08-09 | 2018-08-09 | Gear shaft, rotating shaft assembly and compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208534827U (en) |
-
2018
- 2018-08-09 CN CN201821286694.XU patent/CN208534827U/en active Active
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