China's railway wagon without axle box double row tapered roller bearing seal form
China's railway wagon without axle box double row tapered roller bearing seal form profile, 2018 -
09 of the rolling bearing sealing device is to prevent the bearing internal lubricant leaked into the bearing internal and external foreign materials, to prevent the loose seal cover, oil seal, seal should be resistant, ageing resistance, long service life, good sealing performance, stable and reliable characteristics.
One, the development of our country railway freight car rolling bearings is used initially in the contact seal, by vice lip and sealing oil seal main producing interference fit between and achieve the purpose of the contact seal, the sealing structure in use has exposed some problems, in addition to the 197720 type bearing still use, other bearing is no longer used.
In January 1997 in railway truck axle box double row circular cone roller bearings jacket with a labyrinth seal and labyrinth seal principle is to increase the axial and radial channels, change flow direction and enlarge a space, make the sealing grease or external foreign body through a small gap, long process, curved road, when air chamber increases the flow resistance and energy consumption, so as to achieve the bidirectional sealing role.
Seal form should be selected according to types of conditions of use, lubricants bearings.
To reduce the temperature because the temperature of the sealing contact friction influence on railway transport order, China's railway wagon bearing basic choose labyrinth seal.
Two, sealing form 1, contact sealing principle of sealing contact seal from the oil film lubrication theory to boundary lubrication theory, at present, the more accepted is alternate lubrication theory, namely the lip contact surface and the seal seat both dry contact, and boundary lubrication and oil film lubrication, alternations between the three.
Our country started to use on the railway freight car rolling bearings is contact seal, depends on the oil seal main lip and sealing and producing interference fit between and achieve the goal of contact seal.
The sealing structure has exposed some problems in using: due to the interference fit sealing lip and the seal seat, caused by friction when rotating bearing operating temperature is too high, oil seal lip aging.
Due to lower elasticity, abrasion and accelerated the oil seal lip.
Although spring produce hold force, seal are still falling, causing the inside of the bearing oil leak, can enter the bearing internal external foreign materials, resulting in bearing early faults.
In addition to the 197720 type bearing still use, other bearing is no longer used.
2, labyrinth seal principle of labyrinth seal device is to increase the axial and radial channels, change flow direction and enlarge a space, make the sealing grease or external foreign body through a small gap, long process, curved road, when air chamber increases the flow resistance and energy consumption, so as to achieve the bidirectional sealing role.
The sealing structure of small torque, low friction, low temperature, sealed performance is stable.
1) fission labyrinth seal a)
Rubber fission labyrinth seal in January 1997 in 197726 to use the rubber bearing fission labyrinth sealing device, with metal skeleton oil seal and oil seal, oil seal inside and outside the oil seal, respectively, in the form of interference fit on the sealing seat and the seal cover installation;
Then in 352226 x2 -
Type 2 rz and x2-353130
Type 2 rz bearing.
Fission labyrinth seal rubber and metal in 353130 a type bearing in July 2005 started using fission labyrinth seal, rubber and metal by being connected in the rubber pieces on the seal cover and front cover, back mixing of labyrinth seal device.
(2) combination of labyrinth seal a)
LL labyrinth seal LL seal for lip seal, its structure is rubber vulcanization directly in the seal cover is pressed on the relatively static bearing outer ring, and being connected in the bearing inner ring guard outside diameter (
Or seal seat)
Metal stamping parts of seal.
In October 2005 and SKF353130 SKF197726 type
2 start using rs type bearing.
In 2006, 353130 b type bearing.
HDL type seal HDL type labyrinth seal for lip seal structure, the structure is low torque of rubber vulcanization directly in the seal cover and pressed on the relatively static bearing outer ring, metal stamping parts and pressed on the seal seat seal, seal in lip has a special pump structure design, the lip specially designed with a certain Angle of inclined plane, oil can be returned to the oil-rich area and oil seal lip, reduce oil leakage, used on AP150 type, AP130 type bearing.
Railway vehicle resource platform)