CN103791044A

CN103791044A - Special planetary gear box with bearings lubricated by grease for high-power tubular pump

Info

Publication number: CN103791044A
Application number: CN201210443611.4A
Authority: CN
Inventors: 吴声震
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-30
Filing date: 2012-10-30
Publication date: 2014-05-14

Abstract

The invention relates to the technical field of speed reducing gear boxes for water pumps, and discloses a special planetary gear box with bearings lubricated by grease for a high-power tubular pump. The special planetary gear box comprises a box and a single-stage planetary gear train. The box comprises a front box, an inner gear ring and a rear box, and the inner gear ring and the rear box are sequentially connected with each other. The special planetary gear box is characterized in that journals on two sides of a planetary carrier are respectively supported in an inner hole of the front box and an inner hole of the rear box by a first bearing and a second bearing, a first sealing part and a second sealing part are arranged on two sides of the first bearing, and a third sealing part and a fourth sealing part are arranged on two sides of the second bearing; a planetary gear is supported on a planetary shaft by a first sealed bearing; the sealed bearing is a contact radial sealed bearing and can be a single-lip sealed bearing or a double-lip sealed bearing; the sealing parts are lip-shaped sealing rings with rotary shafts or Ju's combination seals comprising thin-lip serrated slide rings and O-shaped rings. The special planetary gear box has the advantages that the bearings can run reliably, and accordingly a speed reducer is long in service life and low in noise.

Description

The high-power through-flow pump planetary gear box specially of grease lubrication for bearing

[technical field]

The present invention relates to water pump reduction gear box technical field, the high-power through-flow pump planetary gear box specially of grease lubrication for a kind of bearing, its novelty is in casing that rolling bearing bearing grease lubricates, the gear oil pressure lubrication of gear engagement pair.

[background technique]

The present invention is background technique " planetary gear box specially for great power bidirectional submersed three-flow pump " innovation (ZL200710068047.1).

Planetary gear box specially is able to a large amount of being used as the main device of key equipment one bidirectional submersed three-flow pump of water conservancy construction, and this is because the application of epicyclic gearbox in submersed three-flow pump can significantly reduce the investment of whole hydraulic engineering.

Background technique subject matter: adopt gear oil lubricating bearings and gear simultaneously in gear-box, the fine iron filings that produce when gear engagement enter lubricant oil, and lubricated oil degenerates gradually, causes bearing damage gear-box because of disorderly closedown.Its theoretical foundation is as follows:

(1) " wind-driven generator group wheel box lubricant oil select guide " is pointed out: " machine halt trouble of domestic wind-powered electricity generation unit 80% is because gear-box problem, and the gear-box probability that breaks down is respectively: bearing 81%, gear 14% ... "

(2) " insufficient lubrication is the main cause that causes bearing early damage " (891 pages of Liu Zejiu " rolling bearing application manual ")

(3) " ... bearing early failue is not often the fatigue ruption that material causes, but pollutant enter bearing inside afterwards lubricated oil degenerate gradually, on rolling surface of contact, produce due to impression." (" sealing technique of seal deep groove ball bearing " bearing 2009.05)

Radial ball bearing contact stress σ jmax=5000MPa (р. д. not " the rolling bearing handbook " 134 pages of prompt Germania) be gear pair σ jmax=1450MPa 3-4 doubly, therefore the turbidity test of bearing grease (oil) should be far away higher than the lubricant oil of gear.

(4) the gear expert of largest domestic type wind turbine gearbox enterprise---Nanjing High-speed Gear Manufacturing Co., Ltd explicitly points out in patent of invention " input end of wind-driven generator wheel-box " (201110062373.8) application specification:

The iron filings and the impurity that in the running of existing wind-driven generator pitching or Yaw gearbox, produce enter in bearing with lubricant oil, directly affect gear-box working life,

(5) 94 pages of Zhu Xiaolu " Gear Transmission Design handbook ": in power gear transmission, tooth surface is because skimming wear, burn into are overheated etc., thereby occurs that flank of tooth loss is inevitable;

Require in theory grease lubrication for bearing (or not containing additive mineral oil), gear additive lubricating oil:

(1) 893 pages of Liu Zejiu " rolling bearing application manual ": " when run up or high temperature under the bearing of working; in the time cannot using grease lubrication or when the contiguous another part (as gear) of bearing uses oil lubrication, bearing is just used oil lubrication.”

921 pages: " ... the lubricated general mineral oil with not containing additive of rolling bearing ";

(2) 1087 pages of Zhu Xiaolu " Gear Transmission Design handbook ": the gear under boundary lubrication condition, should use the lubricant oil containing extreme pressure anti-wear additives (additive).

SH/T0017-1990L-FC Grade A bearing oil kinematical viscosity is 90-100; Be that 288-352 is much smaller than gear oil viscosity.

Conclusion: the main cause that gear-box produces fault is that iron filings and the impurity producing in gear-box running enters in bearing with lubricant oil, and bearing damage causes gear-box to break down and shuts down, even if having filter and magnetic plug.

Stuffing box bearing can prevent that iron filings and impurity from entering in bearing with lubricant oil, guarantees the reliability that gear-box uses.Select the theoretical foundation of stuffing box bearing as follows:

1. " sealing technique of seal deep groove ball bearing " bearing 2009.05: " seal deep groove ball bearing has antipollution, anti-dust, simplifies main machine structure, is convenient to the advantages such as installation and maintenance, is widely used in the field such as motor, Aeronautics and Astronautics.In some matched host machine, the early failue of bearing is not often the fatigue ruption that material causes, but pollutant enter bearing inside afterwards lubricated lipid degenerate gradually, on rolling surface of contact, produce due to impression.”

2. 593 pages of Liu Ze nine " rolling bearing application manual ": " stuffing box bearing both can have an excellent sealing to lubricate environment, also saved complicated lubrication system simultaneously.So at compact structure, the strict position of seal request, all suggestion is used stuffing box bearing.Bearing self seal is good dustproof except having, sealing effect, can also in bearing operation process, not need supply oiling agent and keep good operation state, has reduced maintenance expenses.”

3. 95 pages of Bu Yan " practical bearing technology handbook ": " those compact structures, axial dimension require little, seal request strict, safeguard repairing difficulty, inconvenience adopts the place of additional seal device, can preferentially select stuffing box bearing.”

4. 221 pages of Ai Siman " rolling bearing design and application manual ": " in the time of compact structure, preferably use the radial ball bearing that two sides sealing is housed.The radial ball bearing that two sides seal ring is housed has packed the lubricating grease of the whole life time of enough bearings into.”

1096 pages of Zhu Xiaolu " Gear Transmission Design handbook ": " gear lubricant and gear and other another parts the same working life that has it, the working life of oil product is closely related with applying working condition and maintenance technology again.General industry gear normal operation 2500h. or must change oil for 6 months." 913 pages of Liu Zejiu " rolling bearing application manual " provide Fig. 7-3 bearing and change fat cycle experience curve, for ease of applying the existing following fitting formula that is transformed to:

T＝1.475·10 ⁶K ^-0.9908～1.025·10 ⁶K ^-0.8626(h.)

In formula: COEFFICIENT K=K _fnDm (rmm/s) (ball bearing K _f=0.9～1.1), Dm=(D+d)/2, result of calculation: the fat cycle of changing > 2500 (h.) of stuffing box bearing, thereby proved that stuffing box bearing has packed the lubricating grease of the whole life time of enough bearings into.

Motor n ₁=1000rpm, NAD:i=6.3, n=158.7rpm, NBD:i=40, n=25rpm change the fat cycle

And for example: ZJ2240 cement ball mill planetary reducer: planet wheel bearing 22352:260 × 540 × 165

Thereby K=K _fnDm (rmm/s)=1.0 × 43.6 ÷ 60 × 400=290.7

Therefore change the fat cycle be: T=1.475106K-0.9908～1.025106K-0.8626=5346～7688 (h.)

Rotating speed is lower, changes the fat cycle longer.Motor rotor shaft adopts stuffing box bearing exactly.

[summary of the invention] provides the bearing grease lubrication that a kind of bearing grease is lubricated, gear oil is lubricated high-power through-flow pump planetary gear box specially.

[technological scheme] described planet carrier two side shaft journals are bearing in front casing and rear box endoporus with first, second bearing respectively, and there is first, second Sealing described clutch shaft bearing both sides, and there is the 3rd, the 4th Sealing described the second bearing both sides; Described planet wheel is bearing on spider gear shaft with the first stuffing box bearing.

[beneficial effect] technique effect is that bearing operation is reliable, thereby retarder long service life, noise are low.

[accompanying drawing explanation] Fig. 1. embodiment of the present invention structural representation

[embodiment] encyclopaedizes the present invention below in conjunction with accompanying drawing:

With reference to Fig. 1. the high-power through-flow pump planetary gear box specially of grease lubrication for a kind of bearing, comprise casing and planetary gear train, described casing comprises front casing 11 and the ring gear 7 and rear box 10 that connect in turn, described planetary gear train comprises sun gear 1, planet carrier 2, planet wheel 6, spider gear shaft 5 and ring gear 7, described spider gear shaft 5 is fixed on the two side of planet carrier 2, described sun gear 1 and input shaft 9 splined, gearing down route: power is passed to the sun gear 1 connecting with it by input shaft 9, by engaging with uniform planet wheel 6 and ring gear 7, finally by planet carrier 2 output of slowing down, it is characterized in that:

2 liang of side shaft journals of described planet carrier are bearing in forward and backward casing 11,10 endoporus with first and second bearing 4,3 respectively, and there is first and second Sealing 41,42 described clutch shaft bearing 4 both sides, and there is the 3rd, the

4th Sealing

31,32 described the second bearing 3 both sides;

Described planet wheel 6 use the first stuffing box bearings 8 are bearing on spider gear shaft 5;

Stuffing box bearing is contact-type radial seal bearing RK or RS or HMS (A) or MHS (A) type, has two kinds of single lip and lips (593 pages of Liu Zejiu " rolling bearing application manual ");

Described Sealing is rotary shaft lip seal or the Che Shi combination seal that is made up of thin lips and teeth shape slip ring+O type circle.

The crown of Che Shi combination seal profile of tooth slip ring is bordering on line with surface of revolution and contacts, and has reduced frictional heat.Thick 0.001～the 0.0025mm of slip surface oil film, unlikely being scraped into dripped (leakage), and O type circle makes sealing surface wear auto-compensation.Pressure operating temperature-55～250 ℃.The extensive Ying Yu of excellent specific property such as Che Shi sealing automatic elastic compensating, long lifetime, low friction, nothing leakage are in space flight, metallurgy, field of petrochemical industry (referring to into large elder generation " mechanical design handbook " volume 2 and the relevant paper of Che Shi sealing).

Claims

1. the high-power through-flow pump planetary gear box specially of grease lubrication for bearing, comprise casing and planetary gear train, described casing comprises front casing (11) and the ring gear (7) and rear box (10) that connect in turn, described planetary gear train comprises sun gear (1), planet carrier (2), planet wheel (6), spider gear shaft (5) and ring gear (7), described spider gear shaft (5) is fixed on the two side of planet carrier (2), described sun gear (1) and input shaft (9) splined, the route of gearing down: power is passed to the sun gear (1) connecting with it by input shaft (9), by engaging with uniform planet wheel (6) and ring gear (7), finally slow down and export by planet carrier (2), it is characterized in that:

Described planet carrier (2) two side shaft journals use respectively first, second bearing (4,3) to be bearing in front casing (11) and rear box (10) endoporus, there is first, second Sealing (41,42) described clutch shaft bearing (4) both sides, and there is the 3rd, the 4th Sealing (31,32) described the second bearing (3) both sides;

Described planet wheel (6) is bearing on spider gear shaft (5) with the first stuffing box bearing (8);

Described stuffing box bearing is contact-type radial seal bearing, as RK or RS or MHS (A) or MHS (A) type;

Described Sealing is rotary shaft lip seal or Che Shi combination seal.