Wind power constant brake yaw cycloid gear box
[technical field] the present invention relates to wind power yawing braking technique field, a kind of wind power constant brake yaw cycloid gear box.
[background technique] is mainly level Four planetary structure:
1. Nanjing high gear company " wind power generation yaw gearbox " ZL200410064930; 2. Chongqing gear company " drift reduction gearbox of power generation " 200620111262; 3. group of ACE Semi " wind-power generating yaw speed reducer " 200910034525; 4. Yinchuan power speed reducer company " high-power wind power generation yawing speed reducer " 20112065216; 5. Tianjin speed reducer company " for yawing speed reducer for wind power generation " 200820075290; ⑥Hua Rui wind-powered electricity generation scientific & technical corporation " drift reduction gearbox of power generation " (200820014549).
Existing problems: (1) existing gear-box safety coefficient is lower, easily early stage spot corrosion when bearing fatigue load.Easily there is microcrack in gear hobbing in addition, heat treatment and roll flute stress concentration point tooth root place, does not have a high reliability; (2) only have three planet wheels, obvious overload capacity can not be too high; (3) axially length, complex structure, price are very high.
In addition also have: (1) Tianjin speed reducer company " for yawing speed reducer for wind power generation " 200320111939.2 is cycloid+secondary planet structure, shortcoming is: efficiency reduces 2 percentage points, the two fulcrum needle pin structure of high speed level cycloid, thus low, the poor reliability of overload capacity; (2) University Of Chongqing " a kind of secondary envelope ... " 200920127322.7 is cycloid+gerotor structure, and shortcoming is: efficiency reduces 4 percentage points, output shaft two be only placed in end plate and hypocycloid take turns between bearing larger than routine go out a 2-3 model, valency is very high; (3) " wind power three-cycloid yawing reducer " (201010174547.5) are cycloid+three-disk cycloid structure, shortcoming is: 1. " cycloid+three cycloid " structure makes efficiency reduce by 4 percentage points, and three wheel phase differences 120 ° cannot realize dynamic balancing; 2. pinhole grinder static balancing adjustment trouble, pin-and-hole precision is unstable and can affect retarder working life; 3. roller bearing radial clearance is large, produces click, click micro-vibration during cycloid wheel translation, and appearance of a specified duration is impacted, and causes capacity eccentric bearing to damage retarder and breaks down.
[summary of the invention] is that " wind power three-cycloid yawing reducer " (201010174547.5) are improved, and provides the large and efficiency of a kind of high reliability, overload power and level Four phase of planets wind power constant brake yaw cycloid gear box together.Improvement opportunity scheme is as follows:
(A), in three pieced cycloidal gear, breast wheel thickness is both sides uniform thickness wheel twices, and the two phase shifting 180 °, can realize dynamic balancing;
(B) adopt back-to-back tapered roller capacity eccentric bearing, radial clearance is transferred to and is bordering on zero, produces vibration when eliminating cycloid wheel translation;
(C) adopt after cycloid wheel rim roll flute with cast iron spoke workpiece package assembly, wherein the uniform pin-and-hole of cast iron spoke can adopt right boring in vertical machining centre and obtain enough highi degree of accuracy.For improving the working life of low hardness pin bore surface, sliding in pin-and-hole and joining wear-resisting ring.Tradition cycloid wheel pin-and-hole must grinding on pin-and-hole special purpose grinder, because now cycloid wheel is in large eccentricity position, and pin-and-hole is little must adjust to very high static balancing and could obtain designing requirement, work efficiency is extremely low, and need configure all size pin-and-hole special purpose grinder;
(D) present invention employs the structure innovation of two group steel ball V-type slot device, friction pair and spring assembly, wherein: two groups of steel ball V-type slot devices improve (seeing Ruan Zhongtang " mechanical stepless transmission " 90 pages) according to steel ball V-type groove automatic pressurizing device in mechanical stepless transmission: first group is made up of active V-type slotted disk, the driven V-type slotted disk in telophragma side and the steel ball occupy in the middle of two dish V-type groove faces, and wherein telophragma connects with cone dish; Second group is made up of telophragma opposite side active V-type slotted disk, the second driven V-type slotted disk and the steel ball occupy in the middle of two dish V-type groove faces, and steel ball is distributed on retainer.Working principle: during energising, first group of active V-type groove face produces positive pressure to steel ball, and its axial thrust load promotes the driven V-type slotted disk of telophragma makes friction pair be separated, and braking moment disappears, and its circumferential component drives the output shaft work done connected with second group of driven V-type slotted disk; During power-off, input shaft stop, resisting moment makes the second driven V-type groove face produce positive pressure to steel ball, and its axial thrust load makes friction pair compress, and braking moment will muchly have much.
[beneficial effect] is embodied according to patent of invention " Yaw gearbox for wind power generator " (ZL200410064930.X) its creativeness:
(1) single-stage speed reducing ratio can up to 143, and compact structure, easy to maintenance, axial dimension is short;
(2) cycloidal gear teeth can not break, and thus large than only there being three planet wheel bearing capacitys, reliability is high;
(3) lightweight, low cost of manufacture 45-55%.
Each wind field variable propeller gearbox is worth (132 × 50,000/platform) 6,600,000 yuan, thus can save 3,300,000 yuan, is enough to pay wind field 7-8 name employee compensation by this interest of 3,300,000.Announce according to Wind Energy In China association, within 2010, newly-increased installed capacity of wind-driven power is 189GW, and be equivalent to 380 (33 × 1.5MW) wind fields, Yaw gearbox is worth 25 hundred million, thus 12.5 hundred million can be saved, well beyond China's three large wind power gear corporate profit summations.
[accompanying drawing explanation] Fig. 1. embodiment of the present invention structural representation
Fig. 2. be respectively steel ball and V-type groove face at power-off (braking) and Force principle figure during energising (work done) with 3.
[embodiment] encyclopaedizes the present invention below in conjunction with accompanying drawing:
With reference to Fig. 1. a kind of wind power constant brake yaw cycloid gear box, by planetary part, cycloid parts and brake component composition, described planetary part comprises sun wheel shaft 27, sun gear W, planet wheel G, internal gear N, planet carrier 4 and middle support 19, wherein internal gear N is connected on middle support 19 interior edge face, sun gear W is contained in sun wheel shaft 27 axle stretch end, sun wheel shaft 27 bearing 24 is bearing in end cap 23 endoporus, end cap 23 connects with front support 28, front support 28 connects with middle support 19, and described planet carrier shaft 4 both sides are bearing in output shaft 3 and middle support 19 endoporus with bearing respectively, and described hypocycloid parts comprise support 1, cycloid wheel assembly, be contained in the capacity eccentric bearing on planet carrier shaft 4 axle stretch end, pin wheel housing 22, needle pin 36 and pin axle type output mechanism, described pin axle type output mechanism comprises output shaft 3, pin 16, column sleeve 8, 13 and first, two all carry ring 11, 17, described output shaft 3 clutch shaft bearing 2 is bearing in support 1 endoporus, described support 1, pin wheel housing 22 and middle support 19 are integrally togather in turn, described first all carries ring 11 is placed between cycloid wheel, and second all carries ring 17 is contained in pin 16 end and is bearing on middle support 19 medial flange cylindrical with the second bearing 18, and pin is freely supported structure, improve the crooking ability of pin, it is characterized in that:
(I) described cycloid wheel assembly is that cycloid wheel rim junction of the edges of two sheets of paper pin connects cast iron spoke, wherein: the cycloid wheel rim (10) of both sides connects the first cast iron spoke (7), middle cycloid wheel rim (21) connects the builtup member of the second cast iron spoke (20), thus uniform on cast iron spoke pin-and-hole can in vertical machining centre right boring, more traditional pin-and-hole grinding accuracy on special purpose grinder is high, middle cycloid wheel rim (21) thickness is the twice of both sides uniform thickness cycloid wheel rim (10), thus middle cycloid wheel rim (21) can realize dynamic balancing with both sides cycloid wheel rim (10) phase difference 180 ° makes transmission more steady, slide in the upper uniform pin-and-hole of first cast iron spoke (7) and join the first wear-resisting ring (9), slide in the upper uniform pin-and-hole of second cast iron spoke (20) and join the second wear-resisting ring (14), theory calculate shows, because the equivalent radius of wear-resisting ring and pin-and-hole is very little, the contact stress between wear-resisting ring and pin-and-hole is made to be only 1/20th of allowable value, thus low hardness pin-and-hole can not premature abrasion, described cast iron spoke material is spheroidal graphite cast iron or high-strength gray cast iron, this is because the two technology capability is good, absorbing and good casting property,
(II) described planet carrier shaft (4) axle stretch end is provided with capacity eccentric bearing, capacity eccentric bearing comprises the eccentric bushing (5) of the first tapered roller bearing (6) and endoporus close-fitting, the eccentric bushing (12) of the second tapered roller bearing (15) and endoporus close-fitting, tapered roller bearing is two bearing pack back-to-back, radial clearance is controlled to and be bordering on zero during assembling;
(III) in described brake component, input shaft 29 bearing is bearing in front support 28 endoporus, the endoluminal means Shuan ZuVXing slotted disk mechanism that front support 28 connects with middle support 19, friction pair and Returnning spring 26, wherein:
(III-1) described friction pair comprises internal cones (32) and cone dish (31), wherein internal cones (32) is connected in front support (28) endoporus, and cone dish (31) connects with the telophragma (33) of Shuan ZuVXing slotted disk mechanism;
(III-2) in described Shuan ZuVXing slotted disk mechanism, first active V-type slotted disk 30 is connected on input shaft 29, telophragma 33 side is the first driven V-type slotted disk, first initiatively has the first steel ball 341 between V-type slotted disk 30 and the first driven V-type slotted disk, second driven V-type slotted disk 35 is slidably connected with sun wheel shaft 27 external splines axle stretch end, telophragma 33 opposite side is the second active V-type slotted disk, second initiatively has the second steel ball 34 between V-type slotted disk and the second driven V-type slotted disk 35, and uniform steel ball quantity is equal with V-type groove number;
(III-3) described Returnning spring 26 one end is close to the end in cup type spring seat 25, the other end is close to the second driven V-type slotted disk 35 end face, Returnning spring 26 makes cone dish (31) and internal cones 32 friction pair compress, described cup type spring seat 25 exterior edge face is close on the shaft shoulder of sun wheel shaft 27, and cup type spring seat 25 opening end and the second driven V-type slotted disk 35 end face have gap.
Working principle: during energising, the first active V-type slotted disk V-type groove face connected with input shaft produces positive pressure to steel ball: axial thrust load promotes telophragma makes friction pair be separated, and braking moment disappears; Circumference component drives and rotates work done with the sun wheel shaft of the second driven V-type slotted disk splined.Obvious first group of steel ball V-type slot device function is clutch, and second group of steel ball V-type slot device function is coupling; When power is off, input shaft stop, resisting moment makes the V-type groove face of the second driven V-type slotted disk produce positive pressure to steel ball, its axial thrust load makes friction pair compress, thus braking moment will muchly have much, as long as friction pair has enough large specific pressure p allowable, ensures that gear-box is in highly reliable braking state.