CN103791030A

CN103791030A - Rail transit gear box with bearings lubricated by grease

Info

Publication number: CN103791030A
Application number: CN201210443580.2A
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 gear boxes, and discloses a rail transit gear box with bearings lubricated by grease. The rail transit gear box comprises a base, an input gear shaft, a driven gear, a shaft gear, an output shaft and an output gear wheel, and is characterized in that journals on two sides of the input gear shaft are respectively supported in corresponding holes of two side walls of the base by a first bearing and a second bearing, a first sealing part and a second sealing part are respectively arranged between the first bearing and the gears and the second bearing and the gears, and a third sealing part is further arranged on the other side of the second bearing; two ends of the shaft gear are respectively supported in corresponding holes of the two side walls of the base by a third bearing and a fourth bearing, and a fourth sealing part and a fifth sealing part are respectively arranged between the third bearing and the gears and the fourth bearing and the gears; two sides of the output shaft are respectively supported in corresponding holes of the two side walls of the base by a fifth bearing and a sixth bearing, a sixth sealing part and a seventh sealing part are respectively arranged on two sides of the fifth bearing, and an eighth sealing part and a ninth sealing part are respectively arranged on two sides of the sixth bearing; the first bearing, the second bearing, the third bearing, the fourth bearing, the fifth bearing and the sixth bearing are filled with the bearing lubricating grease or sealed when assembled. The rail transit 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

Bearing grease lubrication rail traffic gear box

[technical field]

The present invention relates to gear-box technical field, a kind of bearing grease lubrication rail traffic gear box.

[background technique]

The present invention is the innovation of following background technique.

" a kind of gear-box for rail traffic vehicles " (ZL201010136767.9);

" rail traffic gear box " (201210134013.9);

" bearing lubricating structure of driving gear shaft of gear box for urban rail traffic vehicle " (ZL201120484386.X)

Paper " Fatigue failure of heavy-duty gear surface and prevention " is pointed out: " bearing wheels tooth surface is bearing multi-form effect of stress everywhere; the flank of tooth and subcutaneous metal may produce fine crack and form tired source; stress-number of cycles increases thereupon; crackle will constantly be expanded so that be connected with each other and form biscuit metal and come off; the flank of tooth occurs that spot corrosion peels off, and gear teeth face produces fatigue damage.”

Paper " the destruction reasons and management method of mine speed reducer " is pointed out: " decelerator trouble accounts for 40% in coal mine equipment fault.Bearing is the another part that is very easy to damage in retarder.Bearing mode of failure: bearing scratches, bearing is adhered, bearing is invaded impurity, retainer fracture etc.Reason: in lubricant oil, large granular impurity content is higher, increases the weight of bearing wear degree.”

(1) causing the principal element of decelerator trouble is bearing fault, and the basic reason of bearing fault is:

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

" ... bearing early failue 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." (" sealing technique of seal deep groove ball bearing " bearing 2009.05)

(a) 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;

(b) upper 103 pages of Shanghai Machinery College " Fundamentals of Machine Design ": " transmission equipment can be found tooth surface wear trace after using a period of time, is lubricating under poor or the impure condition of lubricant oil especially, and wear phenomenon is more obvious.Wearing and tearing are owing to having active force and relative sliding to cause between surface of contact.”

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

(a) 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 ";

(b) 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/T0017-1990 L-FC Grade A bearing oil kinematical viscosity is 90-100; Be that 288-352 is much smaller than gear oil viscosity.Conclusion: the basic reason that rate of fault is high is gear oil oilgear and bearing simultaneously.Thereby the essential stuffing box bearing that adopts.

Theoretical foundation is as follows:

1. 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.”

2. 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.”

3. 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.”

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

[summary of the invention]

Provide that a kind of bearing grease is lubricated, the bearing grease lubrication rail traffic gear box of gear gear oil lubrication.

[technological scheme]

Input gear axle two side shaft journals are bearing in the respective aperture of support two side with first and second bearing respectively, and first and second Sealing is housed respectively between first and second bearing and gear, and the opposite side of the second bearing also has the 3rd Sealing; Shaftgear two ends are bearing in the respective aperture of support two side with third and fourth bearing respectively, and fourth, fifth Sealing is housed respectively between third and fourth bearing and gear, in order to prevent that the lubricant oil in support from entering bearing; Output shaft both sides are bearing in the respective aperture of support two side with the 5th, six bearings respectively, and there are respectively the 6th, seven Sealings the 5th bearing both sides, and there are respectively the 6th, seven Sealings the 6th bearing both sides; First fills out bearing grease in during to the 6th bearing assemble, or generation is with stuffing box bearing.

[beneficial effect]

Technique effect is that bearing operation is reliable, thereby retarder long service life, noise are low.

[attached have a talk about bright]

Fig. 1. be structural representation of the present invention

[embodiment]

With reference to Fig. 1. a kind of bearing grease lubrication rail traffic gear box, comprise support 5, input gear axle 1, driven gear 11, shaftgear 4, output shaft 7 and output gearwheel 8, described driven gear 11 is connected on shaftgear 4 axle journals and forms duplicate gear, described output gearwheel 8 is connected on output shaft 7, it is characterized in that:

1 liang of side shaft journal of described input gear axle is bearing in the respective aperture of support 5 two sides with first, second bearing 13,2 respectively, and first,

second Sealing

131,21 is housed respectively between gear part and first, second bearing, in order to prevent that the lubricant oil in support from entering bearing, the opposite side of described the second bearing 2 also has the 3rd Sealing 22;

Described shaftgear 4 two ends are bearing in support 5 two side respective aperture with the 3rd, the 4th bearing 12,3 respectively, between described the 3rd, the 4th bearing and two gears placed in the middle, the 4th, the

5th Sealing

121,31 are housed respectively, prevent that in support, lubricant oil enters bearing;

Described output shaft 7 both sides are bearing in support 5 two side respective aperture with the 5th, six bearings 9,6 respectively, and there are respectively the 6th, seven

Sealings

91,92 described the 5th bearing 9 both sides, and there are respectively the 8th, nine Sealings 61,62 described the 6th bearing 6 both sides;

Described first fills out bearing grease in during to the 6th bearing assemble, or stuffing box bearing, and described stuffing box bearing is contact-type radial seal bearing, as RK type or RS type or HMS (A) type or MHS (A) type, has two kinds of single lip and lips.

Described Sealing is rotating shaft lip-shaped sealing or Che Shi combination seal.The crown of Che Shi combination seal profile of tooth slip ring is bordering on line with surface of revolution and contacts, and has greatly reduced high speed rotary grinding heat.Thick 0.001～the 0.0025mm of slip surface oil film, a lubricate and unlikely be scraped into drip (leakage), O type circle makes line contact sealing surface wear be able to auto-compensation.Che Shi sealing: pressure 0～30MPa, 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. a bearing grease lubrication rail traffic gear box, comprise support (5), input gear axle (1), driven gear (11), shaftgear (4), output shaft (7), output shaft (7) and gearwheel (8), described driven gear (11) is connected on shaftgear (4) axle journal, it is upper that described gearwheel (8) is connected in output shaft (7), it is characterized in that:

Described input gear axle (1) two side shaft journal uses respectively first, second bearing (13,2) to be bearing in the respective aperture of support (5) two side, and first, second Sealing (131,21) is housed respectively between gear part and first, second bearing, in order to prevent that the lubricant oil in support from entering bearing, the opposite side of described the second bearing (2) also has the 3rd Sealing (22);

Described shaftgear (4) two ends use respectively the 3rd, the 4th bearing (12,3) to be bearing in the respective aperture of support (5) two side, between described the 3rd, the 4th bearing and two gears placed in the middle, the 4th, the 5th Sealing (121,31) is housed respectively, in order to prevent that the lubricant oil in support from entering bearing;

Described output shaft (7) both sides use respectively the 5th, the 6th bearing (9,6) to be bearing in the respective aperture of support (5) two side, there is respectively the 6th, the 7th Sealing (91,92) described the 5th bearing (9) both sides, and there is respectively the 6th, the 7th Sealing (61,62) described the 6th bearing (6) both sides;

Described first fills out bearing grease in during to the 6th bearing assemble, or Dai Yiyi fills out the stuffing box bearing of bearing grease, described stuffing box bearing is contact-type radial seal bearing, as RK type or RS type or HMS (A) type or MHS (A) type;

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