CN104482181A - Box body interlayer air-cooled type planetary gear reducer box of heavy duty plate feeder - Google Patents
Box body interlayer air-cooled type planetary gear reducer box of heavy duty plate feeder Download PDFInfo
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- CN104482181A CN104482181A CN201410332118.4A CN201410332118A CN104482181A CN 104482181 A CN104482181 A CN 104482181A CN 201410332118 A CN201410332118 A CN 201410332118A CN 104482181 A CN104482181 A CN 104482181A
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- box body
- casing
- bearing
- shaft
- inner cylinder
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
- F16H57/0416—Air cooling or ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02069—Gearboxes for particular applications for industrial applications
- F16H2057/02073—Reduction gearboxes for industry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02086—Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention relates to the improvement of DT type feeder reducers, particularly to a box body interlayer air-cooled type planetary gear reducer box of a heavy duty plate feeder. The box body interlayer air-cooled type planetary gear reducer box comprises a box body, an input shaft, a transmission mechanism and an output shaft, wherein the input shaft, the transmission mechanism and the output shaft are arranged in the box body. The box body interlayer air-cooled type planetary gear reducer box is characterized in that a connecting part of an inner cylinder and a circular end cover is arranged in the box body; the inner cylinder is connected with an output end of the box body; an outer circle of an input end of the circular end cover is in interference fit with an inner hole formed at an input end of the box body; the input end of the circular end cover is connected with the input end of the box body through a circular casing in a sealing mode; the inner wall of the box body and the outer wall of the connecting part of the inner cylinder and the circular end cover form into an interlayer; the lateral side of the box body is provided with a fan; the top of the box body is provided with an air outlet; the input shaft and the output shaft are supported in the circular end cover and the inner cylinder through a bearing respectively; the transmission mechanism comprises a planetary gear, an inner gear ring, an eccentric bearing and a cylindrical pin; an inner meshing pair is arranged in the circular casing. According to the box body interlayer air-cooled type planetary gear reducer box of the heavy duty plate feeder, the heat in the interlayer is discharged from an exhaust window and simultaneously transmitted to the box body to be emitted out of the box body and accordingly the integral box body is cooled, the thermal power is high, the structure is simple, the cost is low, and the inner meshing ratio can be changed to obtain a series of products.
Description
[technical field]
The present invention relates to the improvement of prior art DT heavy-duty plate feeder combined hanging speed reducer dedicated (being called for short DT type distributor retarder), be specifically related to a kind of casing interlayer air-cooled heavy-duty plate feeder star-wheel speed reducer.
[background technique]
Apron feeder is widely used in the broken classification workshop of mammoth mill, as use that is continuous to primary breaker from material stock storehouse or even feeding, also can be used as the short distance conveying of reprinting.Such as slip mountain bottom for mine and directly ore to be fed large vehicle, for from raw material cabin to each joint lorry continuous uniform ground feed entrucking.
DT type distributor retarder, is that gearing research institute of northern heavy industry group designs successfully speed reducer dedicated with reference to the technology of German Fleder company, adopts three grades of orthogonal speed reducers and compound epicyclic reduction gear two housings bolt to be integrally connected structure.
DT type distributor retarder is for high-power heavy plate, there are four series: DT35 (239000Nm, i=360 ~ 840), DT36 (240000Nm, i=330 ~ 840), DT37 (170000Nm, i=270 ~ 610), DT38 (80000Nm, i=270 ~ 610).
Except. except northern heavy industry group, such as the enterprises such as Jiangsu Guo Mao group and Jing Zhou, Hubei Ju Jing gearing company of famous speed reducer enterprise of China also produce DT type four series product.The advanced design scheme that have employed Germany is also called oneself by Ju Jing gearing company.
2006, north heavy industry group development and Design DT39 (60000Nm, i=280 ~ 500) and DT40 (30000Nm, i=280 ~ 440) medium-sized product, its structure characteristic is: two retarders are made of one, adopt the transmission of secondary orthogonal to add the structure that two-stage Gear Planet Transmission is total to level Four, lower margin jointing type, alleviate weight, solve the leakage of oil of two housings junction.
The major defect of prior art DT distributor retarder is:
(1) Pyatyi of DT35 ~ 38 type is slowed down, and the level Four of DT39,40 types is slowed down, and long the brought problem of Transmitted chains is: structure can complicated, cost can raise, complete machine can be heavier and axial dimension is large;
(2) because the two-stage planet (NBD retarder) of prior art fails to adopt cooling measure, natural heat dissipation is only relied on to cause thermal power low, user is had to increasing one, two types number carry out type selecting, many mechanical theory monographs are exactly specify so, its result necessarily increases expense, power is larger, expense increase is more: as specified type NBD800 type (5000kg, valency 13.75 ten thousand yuan, thermal power 204kW), now strengthen two types number and select NBD1000 (8100kg, valency 230,000 yuan, thermal power 335kW), result: price increases 90,000 yuan, weight increases 3000kg, thermal power only increases 130kW.
As can be seen here, the structure for increasing thermal power prior art also must be improved.
Thermal power be enclosed retarder under lubricant oil balanced temperature conditions the peak output that can transmit continuously.Thermal power should equal or be bordering on the power that real work is transmitted.(" Gear Transmission Design handbook " 972 pages)
Input power when thermal power refers to that under natural cool condition lubricating oil temperature is no more than allowable temperature.Thermal power is the important parameter of design lubrication system, is the important evidence selecting retarder.(" design and manufaction of Planetary Involute Gear " 230 pages)
High oil temperature is one of speed reducer fault very major reason, this is because: oil temperature high viscosity declines, oil film breakdown, and lubrication failure causes On Gear Scoring, spot corrosion and inordinate wear; The high gear anomalies that causes of oil temperature is worn and torn, and wearing and tearing make oil temperature raise, and vicious circle like this, makes speed reducer premature breakdown.The highest allowable temperature of reduction gear box lubricating oil sump is about 70 DEG C, and it is according to having three:
(1) German PPSC1290-MY type wind turbine gearbox: lubricating oil sump maximum temperature is 70 DEG C;
(2) the highest oil temperature 70 DEG C (" thermal power of gear of wind power speed-increasing gearbox calculates case " wind-power electricity generation 2003.3) of gear of wind power speed-increasing gearbox expectation
(3) certain 1.25MW unit oil temperature supervisory system domestic: when gearbox lubrication oil temperature is more than 75 DEG C, supervisory system sends alarm signal.(" wind-driven generator group wheel box lubricating oil temperature supervisory system " Shanghai Dian Ji University journal 2008.12)
[summary of the invention]
The object of the invention is to solve the defect that prior art Transmitted chains is long and thermal power is low, planet gearing addition modular internal gear pair is provided, Transmitted chains shortens to two-stage, with alternative natural heat dissipation air-cooled in casing interlayer, enable thermal power close to or reach specified mechanical output, a kind of casing interlayer air-cooled heavy-duty plate feeder star-wheel speed reducer.
For achieving the above object, implementer's case system of taking of the present invention according to:
(1) primary wheel speed reducer is constant, changes modularization internal gear pair speed ratio, just can obtain a series of deceleration product; Planetary-gear speed reducer (JB/T8712-1998) is exactly Reducer With Involute Gear of Less-tooth Difference in fact, has higher transmission efficiency: " gear handbook " upper 7-126 calculated example: η=0.944 (Z
d=2); The routine result of calculation of inventor 100: η=0.934 (Z
d=2), 0.96 (Z
d=3), 0.97 (Z
d=4), thus single-stage can replace secondary planet transmission, shortens Transmitted chains;
(2) propose according to the following discussion that thermal power can be made to be not less than mechanical output about cooling heat radiator:
" Gear Transmission Design handbook " 973 pages: the size of thermal power is relevant with cooling measure, if adopt circulating oil lubrication, cooler and externally mounted fuel tank enough large, thermal power can be not less than mechanical output;
" Gear Transmission Design handbook " 1048 pages: adopt outer circulation radiation system: lubricant oil → oil pump in fuel tank → consider oily device → fan cooled → oil to enter fuel tank, as long as fuel delivery and pectinid amount are enough large, retarder even can not be heated Power Limitation;
Research thermal power correction formula P=B
refb
vb
ab
tp
q(kW) find: adopt enough high wind speed by casing Oil-temperature control about 70 DEG C time, retarder thermal power P can improve 1.5 times, this is because:
(A) as air velocity v >=3.8m/s, correction factor Bv=1.90, improves nearly one times than Bv=1.0 during v=0.5-1.4m/s, that is thermal power P improves nearly one times.As: little axial-flow blower 150FZY type wind speed v=7.6m/s;
(B) during reduction gear box oil temperature 70 DEG C, oil temperature coefficient B
t=0.667, make thermal power improve 50%.
(in formula: B
ref, B
v, B
aand B
tbe respectively ambient temperature, air velocity, altitude and the highest oil temperature correction factor, wherein: B
t=0.00236C
1.32845=0.667 (70 DEG C).(" Gear Transmission Design handbook " 979 pages)
SSX planetary reducer (N=500kW) does not have water source due to underground coal mine, adopts following measure: radiating fin established by increasing casing, casing; Input shaft dress fan.(" design of SSX series Hardened gear face plane table thermoconductivity meter cooling system and application " coal mine machinery 2008.09)
For achieving the above object, implementer's case of taking of the present invention is as follows:
The link of inner cylinder and nose circle lid is provided with in described casing, described inner cylinder flange is connected with casing output end face, the input end cylindrical of described nose circle lid and casing input end endoporus close-fitting, described nose circle lid input end face is connected with round casing end face seal with the nose circle face of casing input end simultaneously, and the outer surface of described inner cylinder and nose circle lid attachments is provided with radiating fin;
The outer wall of described inner cylinder and nose circle lid attachments and the inwall of casing enclose and connect formation closed interlayer, and described casing top is provided with the exhausting window of UNICOM's closed interlayer, and the side of described casing is provided with the axial-flow blower with closed interlayer UNICOM;
The body of described casing and inner cylinder is wall thickness δ=(1.1 ~ 1.3) (T
2)
0.25(mm) even thin-wall circular cylindrical shell;
Described input, first and second bearing of shaft are bearing in nose circle lid endoporus and inner cylinder output terminal endoporus respectively;
Further, described driving mechanism comprises two planet wheels of phase difference 180 °, first ring gear, be located at capacity eccentric bearing and fixed frame on input shaft, left disk and nose circle lid to be connected and fixed with four uniform pillars and to form by described fixed frame, described two planet wheel clutch shaft bearings are bearing on the eccentric segment of double-eccentric shaft, double-eccentric shaft is uniform, the two ends of described double-eccentric shaft are bearing in left disk and nose circle lid respective aperture with the second bearing respectively, described first ring gear is connected on the disk of output shaft, described two planet wheel centre bearing aperture capacity eccentric bearings are installed on the axle stretch end of input shaft, described two planet wheels and the first ring gear engagement driving.
Again further, device internal gear pair in described modularization round casing, comprise the second ring gear and small gear, described second ring gear is connected on the input end of input shaft, described small gear is located at high speed shaft axle stretch end, described high speed shaft bearing is bearing in end cap endoporus, and end cap is connected on modularization round casing end face.When primary wheel speed reducer is constant, and changes the reduction speed ratio of modularization internal gear pair, just can obtain a series of deceleration product, the advantage of internal gear pair be compact structure, the second ring gear quenching with Subsequent tempering, needn't roll flute low cost of manufacture.
Although each independent technical characteristics of the present invention is completely known, support each other, and can following Advantageous Effects be produced:
(1) outer wall of inner cylinder and nose circle lid encloses and connects formation closed interlayer, heat in closed interlayer is discharged by exhausting window on the one hand, the even thin walled cylinder passing to box-like body is on the other hand dispersed into outside casing, cold wind capacity is large, heat diffusion area is large throughout whole casing, thermal power, structure is simple, controls, reliability is high, low cost of manufacture;
(2) thermal power can be made to be not less than the discussion of mechanical output according to cooling heat radiator, the present invention, by the correct calculating to air quantity, wind speed, can accomplish that thermal power is not less than mechanical output;
(3) when Oil-temperature control is at about 70 DEG C, the unlikely decline of oil temperature high viscosity, oil film is not damaged, thus ensures that cycloidal gear teeth and needle pin engagement pair run well under being in good lubrication state always, makes speed reducer have long useful life period;
(4) when primary wheel speed reducer is constant, and change the reduction speed ratio of modularization internal gear pair, just can obtain a series of deceleration product, the advantage of internal gear pair be compact structure, ring gear quenching with Subsequent tempering, needn't roll flute low cost of manufacture.
[accompanying drawing explanation]
Fig. 1. embodiment of the present invention structural representation
Fig. 2 .. embodiment of the present invention casing 1 top establishes air outlet window P and side to establish air inlet fan F structural representation
DT35 ~ DT38 plate-type distributor combination retarder appearance schematic diagram of Fig. 3 .. north heavy industry group
Fig. 4,5,6 is respectively. northern heavy industry group, Guo Mao group and Ju Jing transmission company DT35 ~ DT38 type product photo
DT39, DT40 plate-type distributor combination retarder appearance schematic diagram of Fig. 7 .. north heavy industry group
[embodiment]
Below in conjunction with accompanying drawing, the present invention is encyclopaedized:
With reference to Fig. 1. casing interlayer air-cooled heavy-duty plate feeder star-wheel speed reducer comprises casing 1 and is arranged at the input shaft 14 of also transmission successively in casing 1, driving mechanism and output shaft 5, it is characterized in that:
The link of inner cylinder 3 and nose circle lid 7 is provided with in described casing 1, described inner cylinder 3 flange is connected with casing 1 output end face, the input end cylindrical of described nose circle lid 7 and casing 1 input end endoporus close-fitting, both described nose circle lid 7 and casing 1 input end end face is connected with modularization round casing 15 end face seal simultaneously, described inner cylinder 3 and nose circle lid 7 link peripheral hardware radiating fin;
Described inner cylinder 2 encloses with the outer wall of nose circle lid 5 link and the inwall of casing 1 and connects formation closed interlayer, and described casing 1 top is provided with the exhausting window P of UNICOM's closed interlayer, and the side of described casing 1 is provided with the axial-flow blower F with closed interlayer UNICOM;
The body of described casing and inner cylinder is wall thickness δ=(1.1 ~ 1.3) (T
2)
0.25(mm) even thin-wall circular cylindrical shell ironcasting (T
2speed reducer output torque, Nm) (Cheng great Xian " mechanical design handbook " rolls up 3.14-485 page), cylindrical body has high mechanical properties and excellent heat dispersion performance;
Described input, first and second bearing 13,4 of shaft 14,5 are bearing in nose circle lid 7 respectively with in inner cylinder 2 output terminal;
Described driving mechanism comprises two planet wheels 6 of phase difference 180 °, first ring gear 18, be located at the capacity eccentric bearing 10 on input shaft 14 and fixed frame, left disk 2 to be connected and fixed with nose circle lid 7 with four uniform pillars 17 and to form by described fixed frame, described two planet wheels 6 are bearing in clutch shaft bearing on the eccentric segment of double-eccentric shaft 8, described double-eccentric shaft 8 four is uniform, the two ends of described double-eccentric shaft 9 are bearing in left disk 2 with nose circle lid 7 respective aperture respectively with the second bearing, described first ring gear 18 is connected on the disk of output shaft 5, described two planet wheel 6 centre bearing aperture capacity eccentric bearings 10 are installed on the axle stretch end of input shaft 14, described two planet wheel 6 and the first ring gear 18 engagement driving.
Device internal gear pair in described modularization round casing 15, comprise the second ring gear 16 and small gear 11, described second ring gear 16 is connected on the input end of input shaft 14, described small gear 11 is located at high speed shaft 12 axle stretch end, described high speed shaft 12 bearing is bearing in end cap endoporus, and end cap is connected on modularization round casing 15 end face.When primary wheel speed reducer is constant, and changes the reduction speed ratio of modularization internal gear pair, just can obtain a series of deceleration product, the advantage of internal gear pair be compact structure, ring gear 15 quenching with Subsequent tempering, needn't roll flute low cost of manufacture.
Above-described embodiment is to explanation of the present invention, is not limitation of the invention, anyly all belongs to protection scope of the present invention to the scheme after simple transformation of the present invention.
Claims (1)
1. a casing interlayer air-cooled heavy-duty plate feeder star-wheel speed reducer, comprise casing (1) and to be arranged in casing (1) and the input shaft (14) of transmission successively, driving mechanism and output shaft (5), it is characterized in that:
The link of inner cylinder (3) and nose circle lid (7) is provided with in described casing (1), described inner cylinder (3) flange is connected with casing (1) output end face, the input end cylindrical of described nose circle lid (7) and casing (1) input end endoporus close-fitting, described nose circle lid (7) and casing (1), the two input end nose circle face same modularization round casing (15) end face seal connects, and described inner cylinder (3) is provided with radiating fin with the outer surface of nose circle lid (7) link;
Described inner cylinder (2) encloses to connect with the outer wall of nose circle lid (5) link and the inwall of casing (1) and forms airtight interlayer, described casing (1) top is provided with the exhausting window (P) of UNICOM's closed interlayer, and the side of described casing (1) is provided with and the axial-flow blower of closed interlayer UNICOM (F);
Described casing (1) is wall thickness δ=(1.1 ~ 1.3) (T with the body of inner cylinder (2)
2)
0.25(mm) even thin-wall circular cylindrical shell ironcasting (T
2for speed reducer output torque, Nm);
Described input, shaft (14,5) first and second bearing (13,4) are bearing in nose circle lid (7) endoporus and inner cylinder (2) output terminal endoporus respectively;
Described driving mechanism comprises two planet wheels (6) of phase difference 180 °, first ring gear (18), be located at the capacity eccentric bearing (10) on input shaft (14) and fixed frame, left disk (2) and nose circle lid (7) to be connected and fixed with four uniform pillars (17) and to form by described fixed frame, described two planet wheels (6) are bearing in clutch shaft bearing on the eccentric segment of double-eccentric shaft (8), described double-eccentric shaft (8) four is uniform, the two ends of described double-eccentric shaft (9) are bearing in left disk (2) with nose circle lid (7) respective aperture respectively with the second bearing, described first ring gear (18) is connected on the disk of output shaft (5), the bearing hole at described two planet wheels (6) center is installed on the axle stretch end of input shaft (14) through capacity eccentric bearing (10), described two planet wheels (6) and the first ring gear (18) engagement driving.
The interior device internal gear pair of described modularization round casing (15), comprise the second ring gear (16) and small gear (11), described second ring gear (16) is connected on the input end of input shaft (14), described small gear (11) is located at high speed shaft (12) axle stretch end, described high speed shaft (12) is bearing in end cap endoporus with bearing, and end cap is connected on modularization round casing (15) end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410332118.4A CN104482181A (en) | 2014-07-06 | 2014-07-06 | Box body interlayer air-cooled type planetary gear reducer box of heavy duty plate feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410332118.4A CN104482181A (en) | 2014-07-06 | 2014-07-06 | Box body interlayer air-cooled type planetary gear reducer box of heavy duty plate feeder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104482181A true CN104482181A (en) | 2015-04-01 |
Family
ID=52756759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410332118.4A Pending CN104482181A (en) | 2014-07-06 | 2014-07-06 | Box body interlayer air-cooled type planetary gear reducer box of heavy duty plate feeder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104482181A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872502A (en) * | 1987-09-25 | 1989-10-10 | The Falk Company | Air cooling of enclosed gear drives |
| CN2415209Y (en) * | 1999-11-23 | 2001-01-17 | 陶刚 | Jacket water-cooled continuous casting withdrawal straightening machine speed reducer |
| CN102889342A (en) * | 2011-07-17 | 2013-01-23 | 吴小杰 | Novel pinwheel output cycloid speed reducer |
| CN102996780A (en) * | 2012-10-09 | 2013-03-27 | 吴小杰 | Grease lubricated star wheel speed reducer for bearing |
-
2014
- 2014-07-06 CN CN201410332118.4A patent/CN104482181A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872502A (en) * | 1987-09-25 | 1989-10-10 | The Falk Company | Air cooling of enclosed gear drives |
| CN2415209Y (en) * | 1999-11-23 | 2001-01-17 | 陶刚 | Jacket water-cooled continuous casting withdrawal straightening machine speed reducer |
| CN102889342A (en) * | 2011-07-17 | 2013-01-23 | 吴小杰 | Novel pinwheel output cycloid speed reducer |
| CN102996780A (en) * | 2012-10-09 | 2013-03-27 | 吴小杰 | Grease lubricated star wheel speed reducer for bearing |
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Application publication date: 20150401 |
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