CN213064575U - Efficient lubricating mechanism of gear speed reducer - Google Patents
Efficient lubricating mechanism of gear speed reducer Download PDFInfo
- Publication number
- CN213064575U CN213064575U CN202021557310.0U CN202021557310U CN213064575U CN 213064575 U CN213064575 U CN 213064575U CN 202021557310 U CN202021557310 U CN 202021557310U CN 213064575 U CN213064575 U CN 213064575U
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- Prior art keywords
- gear reducer
- gear
- lubricating oil
- oil storage
- storage box
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- Expired - Fee Related
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 74
- 230000007246 mechanism Effects 0.000 title claims abstract description 50
- 230000001050 lubricating effect Effects 0.000 title abstract description 10
- 239000010687 lubricating oil Substances 0.000 claims abstract description 61
- 239000003921 oil Substances 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 8
- 238000005461 lubrication Methods 0.000 claims description 10
- 239000003129 oil well Substances 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- 230000009471 action Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model discloses a gear reducer's high-efficient lubricated mechanism, including mounting plate, the equal fixed welding in the left and right sides at mounting plate top has the bearing curb plate, the fixed welding in top of two sets of bearing curb plates has gear reducer casing, the backward flow hole that runs through gear reducer casing bottom is seted up on gear reducer casing bottom right side, the equidistant fixed mounting in top position that just is located mounting plate has a supporting bench between two sets of bearing curb plates, three sets of supporting benches's top position is provided with the lubricating oil storage box, the upper end fixed mounting of lubricating oil storage box left side lateral wall has the first cylinder that extends to lubricating oil storage box inner chamber, the upper end fixed mounting that just is located the inner chamber left and right sides wall of lubricating oil storage box in first. This gear reducer's high-efficient lubricating mechanism makes iron fillings and lubricated oil separation through filter screen filtering action, and first cylinder drives the second magnet board and passes through second coasting mechanism horizontal slip and then automatic absorption iron fillings.
Description
Technical Field
The utility model relates to a gear reducer technical field specifically is a gear reducer's high-efficient lubricated mechanism.
Background
Gear reducer relies on the gear of different diameters to carry out the equipment that slows down, thereby gear reducer need rely on lubricating oil to lubricate the gear when using and reduce its rate of wear and improve transmission stability, and traditional gear reducer's high-efficient lubricated mechanism can satisfy people's user demand basically, but still has certain problem, and specific problem is as follows:
1. scrap iron is generated due to the mutual meshing action between gears when most gear reducers in the current market are used, the scrap iron is mixed in lubricating oil to accelerate the abrasion of the gears, and the high-efficiency lubricating mechanisms of most gear reducers in the current market cannot remove the scrap of the used lubricating oil;
2. most gear reducer's high-efficient lubricated mechanism is not convenient for dismantle the change and be unfavorable for changing lubricated oil in the existing market.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-efficient lubricated mechanism of gear reducer to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a high-efficiency lubricating mechanism of a gear reducer comprises an installation bottom plate, wherein bearing side plates are fixedly welded on the left side and the right side of the top of the installation bottom plate, gear reducer shells are fixedly welded on the tops of two groups of bearing side plates, a backflow hole penetrating through the bottom of the gear reducer shell is formed in the right side of the bottom of the gear reducer shell, supporting tables are fixedly installed between the two groups of bearing side plates and located at the top of the installation bottom plate at equal intervals, lubricating oil storage boxes are arranged above the three groups of supporting tables, a first air cylinder extending to the inner cavity of the lubricating oil storage boxes is fixedly installed at the upper end of the left side wall of each lubricating oil storage box, a second sliding mechanism is fixedly installed above the first air cylinder and located at the upper end of the left side wall and the right side wall of the inner cavity of each lubricating oil storage box, and a filter screen is fixedly arranged at the middle position below the second magnet plate and positioned on the left side wall and the right side wall of the inner cavity of the lubricating oil storage box.
Preferably, in the efficient lubricating mechanism for the gear reducer, the second sliding mechanism includes sliding rods and sliding rings, the two groups of sliding rods are respectively and fixedly installed at the front side and the rear side of the upper end of the left side wall and the right side wall of the inner cavity of the lubricating oil storage box, and the sliding rings fixed to the tops of the second magnet plates are sleeved outside the two groups of sliding rods.
Based on the technical characteristics, the scrap iron mixed with lubricating oil materials can be conveniently removed.
Preferably, among the above-mentioned high-efficient lubricating mechanism of gear reducer, gear reducer casing inner chamber front side wall upper end is rotated through the bearing and is connected with the first connecting axle that runs through gear reducer casing back side wall, the outside intermediate position department that just is located gear reducer casing inner chamber of first connecting axle is fixed to be cup jointed the second gear, the bottom meshing of second gear is connected with first gear, the inside second connecting axle that runs through gear reducer casing front side wall that is provided with of first gear, the outside rear side position that just is located first gear of second connecting axle is rotated through bearing and gear reducer casing inner chamber back side wall and is connected, the diameter size of second gear is greater than the diameter size of first gear.
Based on the technical characteristics, the speed reduction is convenient.
Preferably, among the high-efficient lubricated mechanism of above-mentioned gear reducer, the lubricating oil storage box left and right sides and the bottom position symmetry that is located the gear reducer casing install first coasting mechanism, and are two sets of the fixed welding in bottom of first coasting mechanism has the layer board of hanging, and is two sets of hang the lower extreme fixed mounting that the layer board is close to one side lateral wall each other and have first magnet board, the equal fixed welding in lubricating oil storage box left and right sides wall bottom has with first magnet board assorted iron metal sheet, and is two sets of the upper end fixed mounting that the bearing curb plate is close to one side lateral wall each other has the second cylinder, and is two sets of the output that the second cylinder is close to one side each other is.
Based on above-mentioned technical characteristic, be convenient for installation dismantlement lubricating oil storage box.
Preferably, in the efficient lubricating mechanism of the gear reducer, the first sliding mechanism comprises a sliding block and two groups of sliding frames, the two groups of sliding frames are fixedly installed on the left side and the right side of the bottom of the gear reducer shell respectively, and the inner cavities of the two groups of sliding frames are provided with sliding blocks which are welded and integrated with the tops of the two groups of hanging support plates respectively.
Based on above-mentioned technical characteristic, be convenient for installation dismantlement lubricating oil storage box.
Preferably, among the above-mentioned high-efficient lubricated mechanism of gear reducer, lubricating oil storage box top sets up to the opening form, the right side fixed mounting of lubricating oil storage box inner chamber bottom has the oil-well pump, oil-well pump top output end fixed mounting runs through filter screen and backward flow hole and extends to the defeated oil pipe of gear reducer casing inner chamber, the left side fixed mounting at defeated oil pipe top has the fuel sprayer, interval size between fuel sprayer top and the gear reducer casing inner chamber bottom is less than the height size of a supporting bench.
Based on above-mentioned technical characteristic, be convenient for installation dismantlement lubricating oil storage box.
Preferably, in the efficient lubricating mechanism for the gear reducer, a flow guide block is fixedly mounted at the bottom of an inner cavity of the gear reducer housing on the left side of the backflow hole, and the flow guide block is set to be in a shape of being high on the left and low on the right.
Based on the technical characteristics, the guide toilet is convenient for recycling the lubricating oil.
Compared with the prior art, the beneficial effects of the utility model are that:
firstly, through the design of the technical scheme, the used lubricating oil material is filtered by the filter screen to separate the mixed scrap iron from the lubricating oil material, and the first cylinder is started to drive the second magnet plate to slide left and right through the second sliding mechanism so as to automatically absorb the scrap iron;
second, through the design of this technical scheme, thereby start the second cylinder shrink of both sides and drive the layer board that hangs of both sides and slide and make it break away from the lubricating oil storage box, then make it and the separation then the downstream lubricating oil storage box that moves down drive defeated oil pipe and oil nozzle and return opening between the brace table to the lubricating oil storage box that slides of front side, conveniently dismantle and change the lubricating oil storage box and change the lubricating oil material.
Drawings
FIG. 1 is a front view of the cross-sectional structure of the present invention;
fig. 2 is a left side sectional structural view of the gear reducer housing, the first gear, the lifting support plate, the second gear and the lubricating oil storage box of the present invention;
FIG. 3 is a schematic diagram of a right sectional view of the lubricating oil storage tank of the present invention;
fig. 4 is an enlarged schematic view of a portion a of fig. 1 according to the present invention.
In the figure: 1. a gear reducer housing; 2. a first gear; 3. a flow guide block; 4. a load-bearing side plate; 5. a first cylinder; 6. a second cylinder; 7. a first magnet plate; 8. a support table; 9. hoisting a supporting plate; 10. mounting a bottom plate; 11. a ferrous metal plate; 12. a first skid mechanism; 1201. a slider; 1202. a sliding frame; 13. an oil delivery pipe; 14. an oil jet; 15. a second gear; 16. a first connecting shaft; 17. a return orifice; 18. a lube oil storage tank; 19. a second connecting shaft; 20. a second skid mechanism; 2001. a slide rod; 2002. a slip ring; 21. a second magnet plate; 22. a filter screen; 23. an oil well pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides an embodiment: a high-efficiency lubricating mechanism of a gear reducer comprises a mounting base plate 10, wherein bearing side plates 4 are fixedly welded on the left side and the right side of the top of the mounting base plate 10, gear reducer housings 1 are fixedly welded on the tops of two groups of bearing side plates 4, a return hole 17 penetrating through the bottoms of the gear reducer housings 1 is formed in the right sides of the bottoms of the gear reducer housings 1, supporting tables 8 are fixedly arranged between the two groups of bearing side plates 4 and located at the top of the mounting base plate 10 at equal intervals, lubricating oil storage tanks 18 are arranged above the three groups of supporting tables 8, a first air cylinder 5 extending to the inner cavity of the lubricating oil storage tank 18 is fixedly arranged at the upper end of the left side wall of the lubricating oil storage tank 18, the type of the first air cylinder 5 can be ACQ50X5, a switch button of the first air cylinder 5 is arranged at a proper position, and second sliding mechanisms 20 are fixedly arranged above the, a second magnet plate 21 fixed with the bottom of the second slide mechanism 20 is fixedly installed at the right output end of the first cylinder 5, and a filter screen 22 is fixedly installed below the second magnet plate 21 and in the middle of the left side wall and the right side wall of the inner cavity of the lubricating oil storage box 18.
Please refer to fig. 3 and 4 in the drawings of the specification: the second slide mechanism 20 includes slide rods 2001 and slide rings 2002, the two sets of slide rods 2001 are respectively and fixedly installed on the front and rear sides of the upper end of the left and right side walls of the inner cavity of the lubricant oil storage box 18, and the slide rings 2002 fixed with the top of the second magnet plate 21 are sleeved outside the two sets of slide rods 2001.
Please refer to fig. 1 and 2 in the drawings of the specification: the upper end of the front side wall of the inner cavity of the gear reducer housing 1 is rotatably connected with a first connecting shaft 16 penetrating through the back side wall of the gear reducer housing 1 through a bearing, the middle position of the outer part of the first connecting shaft 16 and positioned in the inner cavity of the gear reducer housing 1 is fixedly sleeved with a second gear 15, the bottom of the second gear 15 is meshed with a first gear 2, a second connecting shaft 19 penetrating through the front side wall of the gear reducer housing 1 is arranged inside the first gear 2, the outer part of the second connecting shaft 19 is positioned at the rear side of the first gear 2 and is rotatably connected with the back side wall of the inner cavity of the gear reducer housing 1 through a bearing, and the diameter size of the second gear 15 is larger than that of the first gear.
Please refer to fig. 1 in the drawings of the specification: first coasting mechanism 12 is installed to the lubricating oil storage box 18 left and right sides and the bottom position symmetry that is located gear reducer casing 1, the fixed welding in bottom of two sets of first coasting mechanism 12 has and hangs layer board 9, the lower extreme fixed mounting that two sets of hanging layer boards 9 are close to one side lateral wall each other has first magnet board 7, the equal fixed welding in lubricating oil storage box 18 left and right sides wall bottom has with first magnet board 7 assorted iron metal sheet 11, the upper end fixed mounting that two sets of bearing curb plates 4 are close to one side lateral wall each other has second cylinder 6, the model of this second cylinder 6 can be SC200-25, and the shift knob setting of this second cylinder 6 is in suitable position department, the output that two sets of second cylinders 6 are close to one side each other is connected with hanging layer board 9.
Please refer to fig. 1 and 2 in the drawings of the specification: the first sliding mechanism 12 comprises sliding blocks 1201 and sliding frames 1202, the two groups of sliding frames 1202 are respectively and fixedly installed on the left side and the right side of the bottom of the gear reducer shell 1, and the sliding blocks 1201 which are respectively welded and integrated with the tops of the two groups of hanging support plates 9 are respectively arranged in the inner cavities of the two groups of sliding frames 1202.
Please refer to fig. 1 and 3 in the drawings of the specification: the top of the lubricating oil storage box 18 is set to be open, the right side fixed mounting of the bottom of the inner cavity of the lubricating oil storage box 18 is provided with an oil well pump 23, the model of the oil well pump 23 can be JL-12, a switch button of the oil well pump 23 is arranged at a proper position, an output end of the top of the oil well pump 23 is fixedly provided with an oil delivery pipe 13 which penetrates through a filter screen 22 and a return hole 17 and extends to the inner cavity of the gear reducer housing 1, the left side of the top of the oil delivery pipe 13 is fixedly provided with an oil nozzle 14, and the distance between the top of the oil nozzle 14 and the bottom of the inner.
Please refer to fig. 1 in the drawings of the specification: the bottom of the inner cavity of the gear reducer shell 1 on the left side of the return hole 17 is fixedly provided with a flow guide block 3, and the flow guide block 3 is arranged in a shape of being high on the left and low on the right.
The working principle is as follows: when the efficient lubrication mechanism of the gear speed reducer is used, the efficient lubrication mechanism is firstly installed and fixed at a proper position, then the second connecting shaft 19 is installed and fixed on the driving mechanism, and the first connecting shaft 16 is installed and fixed on the working mechanism, so that the second connecting shaft 19 drives the first gear 2 to rotate and further drives the second gear 15 to rotate until the first connecting shaft 16 is driven to rotate, the rotation speed of the first connecting shaft 16 is smaller than that of the second connecting shaft 19 due to the fact that the diameter size of the first gear 2 is smaller than that of the second gear 15, and the purpose of speed reduction is achieved, when the efficient lubrication mechanism of the gear speed reducer is used, the oil pump 23 is started, lubricating oil in the bottom space of the inner cavity of the lubricating oil storage box 18 is sprayed into a contact space between the first gear 2 and the second gear 15 through the oil conveying pipe 13 and the oil nozzle 14, and the used lubricating oil returns to the lubricating oil storage box again through the backflow hole 17 under the flow guiding effect of the flow guide block 18, the heat of the first gear 2 and the second gear 15 is quickly taken away by the lubricating oil material in the process of recycling, so that the heat can be conveniently dissipated during lubrication, the used lubricating oil material is filtered by the filter screen 22 to separate the mixed iron filings from the lubricating oil material, the first air cylinder 5 is started to drive the second magnet plate 21 to slide left and right outside the slide rod 2001 through the slide ring 2002 so as to automatically absorb the iron filings, when the lubricating oil storage box 18 needs to be disassembled, the second air cylinders 6 on two sides are started to shrink so as to drive the lifting support plates 9 on two sides to slide outside the slide frame 1202 through the slide block 1201 so as to separate from the lubricating oil storage box 18, then the lubricating oil storage box 18 is slid forwards to separate from the support platform 8, then the lubricating oil storage box 18 is moved downwards to drive the oil delivery pipe 13 and the oil nozzle 14 to separate from the return hole 17, so that the lubricating oil storage box 18 is conveniently disassembled, the above is the whole working principle of the utility model.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. 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.
Claims (7)
1. The utility model provides a high-efficient lubricated mechanism of gear reducer, includes mounting plate (10), its characterized in that: bearing side plates (4) are fixedly welded on the left side and the right side of the top of the mounting bottom plate (10), gear reducer housings (1) are fixedly welded on the top of two groups of bearing side plates (4), backflow holes (17) penetrating through the bottom of the gear reducer housings (1) are formed in the right side of the bottom of each gear reducer housing (1), supporting tables (8) are fixedly mounted between the two groups of bearing side plates (4) and located at the top of the mounting bottom plate (10) at equal intervals, lubricating oil storage tanks (18) are arranged above the three groups of supporting tables (8), first air cylinders (5) extending to inner cavities of the lubricating oil storage tanks (18) are fixedly mounted at the upper ends of the left side walls of the lubricating oil storage tanks (18), and second sliding mechanisms (20) are fixedly mounted above the first air cylinders (5) and at the upper ends of the left side wall and the right, the right side output end of the first air cylinder (5) is fixedly provided with a second magnet plate (21) fixed with the bottom of the second sliding mechanism (20), and a filter screen (22) is fixedly arranged at the middle position of the left side wall and the right side wall of the inner cavity of the lubricating oil storage box (18) below the second magnet plate (21).
2. The efficient lubrication mechanism of a gear reducer according to claim 1, wherein: the second sliding mechanism (20) comprises sliding rods (2001) and sliding rings (2002), the two groups of sliding rods (2001) are fixedly installed on the front side and the rear side of the upper end of the left side wall and the right side wall of the inner cavity of the lubricating oil storage box (18) respectively, and the sliding rings (2002) fixed with the tops of the second magnet plates (21) are sleeved outside the two groups of sliding rods (2001).
3. The efficient lubrication mechanism of a gear reducer according to claim 1, wherein: gear reducer casing (1) inner chamber openly lateral wall upper end is connected with first connecting axle (16) of running through gear reducer casing (1) back lateral wall through the bearing rotation, the fixed cover of intermediate position department that first connecting axle (16) outside just is located gear reducer casing (1) inner chamber has second gear (15), the bottom meshing of second gear (15) is connected with first gear (2), first gear (2) inside is provided with second connecting axle (19) of running through gear reducer casing (1) openly lateral wall, the outside rear side position that just is located first gear (2) of second connecting axle (19) is passed through the bearing and is connected with gear reducer casing (1) inner chamber back lateral wall rotation, the diameter size of second gear (15) is greater than the diameter size of first gear (2).
4. The efficient lubrication mechanism of a gear reducer according to claim 1, wherein: lubricating oil storage box (18) the left and right sides just is located the bottom position symmetry of gear reducer casing (1) and installs first coasting mechanism (12), and is two sets of the fixed welding in bottom of first coasting mechanism (12) has and hangs layer board (9), and is two sets of hang the lower extreme fixed mounting that layer board (9) are close to one side lateral wall each other and have first magnet board (7), the equal fixed welding in lubricating oil storage box (18) left and right sides wall bottom has with first magnet board (7) assorted iron metal sheet (11), and is two sets of upper end fixed mounting that bearing curb plate (4) are close to one side lateral wall each other has second cylinder (6), and is two sets of second cylinder (6) are close to the output of one side each other and hang layer board (9) and are connected.
5. The efficient lubrication mechanism of a gear reducer according to claim 4, wherein: the first sliding mechanism (12) comprises sliding blocks (1201) and sliding frames (1202), the two groups of sliding frames (1202) are fixedly installed on the left side and the right side of the bottom of the gear reducer shell (1) respectively, and the sliding blocks (1201) which are welded and integrated with the tops of the two groups of hanging support plates (9) respectively are arranged in inner cavities of the two groups of sliding frames (1202).
6. The efficient lubrication mechanism of a gear reducer according to claim 1, wherein: lubricating oil storage box (18) top sets up to the opening form, the right side fixed mounting of lubricating oil storage box (18) inner chamber bottom has oil-well pump (23), oil-well pump (23) top output fixed mounting has defeated oil pipe (13) that run through filter screen (22) and return-flow hole (17) and extend to gear reducer casing (1) inner chamber, the left side fixed mounting at defeated oil pipe (13) top has oil nozzle (14), interval size between oil nozzle (14) top and gear reducer casing (1) inner chamber bottom is less than the height dimension of brace table (8).
7. The efficient lubrication mechanism of a gear reducer according to claim 1, wherein: the gear reducer shell on the left side of the backflow hole (17) is characterized in that a flow guide block (3) is fixedly installed at the bottom of an inner cavity of the gear reducer shell (1), and the flow guide block (3) is arranged in a shape of being high on the left side and low on the right side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021557310.0U CN213064575U (en) | 2020-07-30 | 2020-07-30 | Efficient lubricating mechanism of gear speed reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021557310.0U CN213064575U (en) | 2020-07-30 | 2020-07-30 | Efficient lubricating mechanism of gear speed reducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213064575U true CN213064575U (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021557310.0U Expired - Fee Related CN213064575U (en) | 2020-07-30 | 2020-07-30 | Efficient lubricating mechanism of gear speed reducer |
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| Country | Link |
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| CN (1) | CN213064575U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278721A (en) * | 2021-12-31 | 2022-04-05 | 浙江炜粒传动有限公司 | Multistage cooling type planetary reducer |
-
2020
- 2020-07-30 CN CN202021557310.0U patent/CN213064575U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278721A (en) * | 2021-12-31 | 2022-04-05 | 浙江炜粒传动有限公司 | Multistage cooling type planetary reducer |
| CN114278721B (en) * | 2021-12-31 | 2023-09-26 | 浙江炜粒传动有限公司 | Multistage cooling type planetary reducer |
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Granted publication date: 20210427 |