ferris wheel bearing Wheel bearings History

Car wheel bearings are used in pairs over a maximum single row tapered roller or ball bearings. With the development of technology, the car has been widely used car wheel unit. The growing scope and use of hub bearing unit has now developed to the miniature ball bearings‍ third generation:

The first generation is a double row angular contact bearing components.

The second generation of the outer raceway for bearing a fixed flange bearing sleeve may simply be fixed with a nut on the axle. Makes the car maintenance becomes easy.

The third generation wheel hub bearing units are using a bearing unit and ABS anti-lock brake system compatible. Wheel hub unit designed to have the inner flange thin wall bearings‍ and an outer flange, the flange is bolted to the drive shaft, the outer flange of the bearing mounted together.

ferris wheel bearing Wheel bearing

Wheel bearings can withstand a large axial load, radial load and overturning moment, comprehensive load, set support, large bearing rotation, transmission, fixed and other functions in one particular structure. Wheel bearings

Single-row four point contact mobile crane bearing‍ ball

Single-row four point contact ball bearing turntable from the inner ring, outer ring, ball, isolated block of four major components, compact, light weight, ball four point contact with the circular rolling road, can withstand the axial force, radial forces. Rotary conveyors, welding operation machine, small cranes and excavators and other construction machinery can be selected. Double-row ball bearing turntable has three races, ball and isolation block can be directly discharged into the upper and lower worm gear speed reducer‍ raceway, according to the situation by force, arranged up and down two rows of balls of different diameters. This assembly is very convenient, carrying angle of both the upper and lower circular raceway is 90 °, can withstand large axial forces and tilting moments. When the axial force is greater than 0.1 times the radial force, roller must be specially designed. Double-row ball slewing bearing axial, radial dimension than the larger, structural tightening. Especially for applications that require above average diameter of tower cranes, truck cranes and other handling machinery. Single row cross roller wheel bearings, composed by two seat, compact, light weight, high manufacturing precision, Deep groove ball bearing‍ small assembly space for installation high precision roller 1: a cross arrangement, can withstand axial force, tipping moment and larger radial force, is widely on lifting the transport, engineering machinery and military products are used.

mobile crane bearing Light Series wheel bearings

Light slewing

Lightweight wheel bearings slewing ring has the same general structure, light weight, flexible rotation. Widely used in food machinery, filling ferris wheel bearing‍ machinery, environmental protection machinery and other fields.

HS Series mobile crane bearing‍‍

Single-row four point contact ball bearing turntable composed by two races, compact and circular raceway ball four point contact. Mainly used truck cranes, tower cranes, excavators, hammers, engineering vehicles, radar scanning equipment to withstand the overturning moment, wind power bearing‍ vertical axial force, the level of mechanical inclination force.

HJ Series wheel bearings

Single row cross roller wheel bearings, composed by two seat, compact structure, high manufacturing precision, small assembly space for installation high precision roller 1: a cross arrangement, can withstand the axial force, dumping turning torque and greater radial force, which is Taper roller bearings‍ widely on transport, engineering machinery and military products are used.                                                                                                                                    

ship loader bearing Wheel bearings code representation

Code of composition

Bearing Code by simply code and post code form.

Fundamental component code

Fundamental code is divided into slim ball bearing‍ three parts, the first part of the code structure types and drive types, central rolling diameter (for more than two rows of rolling element ship loader bearings for maximum rolling element diameter), heart weight rear rolling circle diameter (for two rows above the rolling bearing body weight for maximum heart rolling circle diameter)

1, structure type code according to the rules in Table 1.

01 four-point contact ball slewing bearing‍ bearings; 02 double Reducing ball bearings; 11 interspersed cylindrical roller bearings; 13 with three-row cylindrical roller bearings.

2, transmission type code according to the rules in Table 2.

0 Toothless; an outer involute cylindrical gear teeth smaller modulus; 2 involute cylindrical gear outer teeth larger modulus; 3 involute cylindrical gear teeth within a smaller modulus; 4 involute cylindrical gears inner teeth larger modulus.

3, the fundamental rules of the code compiled

Fundamental code layout, the structure type code and Taper roller bearings‍ transmission type code writing for the front, middle and rear with between. "" Separated.             

ferris wheel bearing Parameter Description

 Tolerances, clearance

Turntable bearing tolerances and clearance in line with JB / T 10471 "Rolling wheel bearings," wind turbines with turntable bearing tolerances slewing rings‍ and clearance in line with JB / T 10705 "Rolling wind turbine bearings."

If the customer dimensions, tolerances, clearance has other special requirements, can provide the appropriate product based on use conditions and user requirements.

Cage

Wheel bearings are used to keep the cage type has a whole shelf, segmented hold different types of aircraft structures or isolated cage and so on. Where the reali slim bearings‍ whole cage or segmented cage using the 20th ZL102 cast steel or aluminum alloy. Isolated cage polyamide 1010 resin, ZL102 cast aluminum or aluminum bronze QA110-3-1.5.                                                                                                                                                                        

mobile crane bearing Applied Materials

Rings and rolling elements with material

Under normal circumstances, turntable bearing rolling elements with the overall hardened carbon chromium bearing steel. Or GCr15SiMn GCr15 high speed bearing‍ steel grades for manufacturing; turntable bearing surface hardened steel ferrule is used when a user without special requirements, generally used in 50Mn steel, but sometimes in order to meet the needs of some special applications, the host can also be based on user-supplied specific conditions of use choose other brands Deep groove ball bearing‍ of surface hardened steel, such as 42CrMo, 5CrMnMo so on.

Cage materials

Turntable bearing retainer integral structural form, segmented, isolated block and so on. Where overall style and segmented cage with the 20th ZL102 cast steel or aluminum alloy. Isolated block polyamide 1010 resin, ZL102 cast aluminum and other manufacturing.

Seal materials

Mobile crane bearing‍ seals with oil and rubber material worm gear speed reducer‍ or materials used nitrile rubber material manufacturing....                                                    

ship loader bearing Turntable bearing material

Under normal circumstances, turntable bearing rings chosen 50Mn, but sometimes in order to meet the needs of a particular application host selection 42CrMo. Rolling element generally used GCr15SiMn. The holder of the type with integral type, sub-type, isolation marine crane bearing‍ block, such as different structural types. Monolithic or segmented retainer using 20 # steel or ZL102 cast aluminum. Isolated block holder 1010 polyamide resin, ZL102 QA110-3-1.5 cast aluminum or aluminum bronze. Seal material: oil and rubber, fluoro rubber, nitrile rubber oil.

Turntable bearing structures commonly used form of a single row, double row four point contact ball slewing bearings, double row angular contact thrust ball slewing bearing, cross roller and cross tapered roller wheel bearings, three-row cylindrical roller wheel ship loader bearing‍s, ball column hybrid high precision bearings‍ wheel bearings, such as different structural forms. According to the distribution of the above types of bearing parts and whether toothed gears are divided into different structure without gear, external gear type, and the tooth.                                                               

ferris wheel bearing Bearing lubrication

Bearings

Most wheel bearings under heavy low-speed operating conditions of work, in general, the use of lubricating grease filling type of bearing lubrication can be subjected to extremely satisfied with the results achieved, the commonly used calcium-based grease grease, ship loader bearing‍ lithium-based lubricating grease, aluminum grease, and high temperature grease, etc., the user can choose the most suitable grease depending on the circumstances.

Bearing seal

Hand wheel bearings are sealed to prevent leakage of grease has been filled out, the other is to prevent outside dust, impurities and moisture intrusion inside the ferris wheel bearing‍ and affect their normal work. Since the wheel bearings are mostly low-speed operation is under heavy load, it is sealed with rubber seals type bearings and labyrinth seals two structures. single direction thrust ball bearing‍ The rubber seal structure itself has a simple structure, small footprint, reliable sealing performance advantages and has been widely used, but the downside is that when the high temperature rubber lip seal is easy to lose early aging, so the temperature wheel bearings under working conditions should work labyrinth seal.

Three-row combination roller wheel bearings (slewing ring)

Three-row roller slewing ring has three seat down and radial raceways separately from each other, so that each row roller load can be Slewing drives‍ determined exactly, can withstand all kinds of loads, is the carrying capacity of the four products the largest one, axial and radial dimensions are larger firm structure, particularly for applications that require larger diameter heavy machinery, such as bucket wheel excavators, wheeled cranes, ship cranes, ladle turret and large-tonnage truck cranes and other machinery on.

Double row angular contact ball slewing bearing (slewing ring)

Double row slewing bearing has three seat, must be specially designed raceways. Double row slewing bearing axial, radial size was relatively large, solid structure, particularly bearing‍ suitable to the requirements of the above average diameter of tower cranes, truck cranes and other handling machinery.

mobile crane bearing The size of load

Deep groove ball bearings generally consists of a pair of rings a retainer, a group of rigid ball and a group of cage, deep groove ball bearing type code 6 is most popular, the most widely used one kind of bearing, deep groove ball bearing has the advantages of simple structure, mobile crane bearing‍ convenient use, is the largest production volume, bearing a certain axial load. When the bearing radial clearance increased, with the function of angular contact ball bearings, can bear large axial load. ,

Deep groove ball bearings are mainly used to withstand pure radial load, also can bear radial load and axial load, when the only subject to pure radial load, the contact angle is zero. When deep groove ball bearings with a larger radial clearance, with angular contact bearing performance, can bear large axial load. Deep groove ball bearing friction coefficient is small, the limit speed is very high, especially in the high speed operating condition of large axial load, deep groove ball bearing thrust ball bearings are more advantages Other bearing‍ than. The other kind of bearing with the same size, such bearing small friction coefficient, high limiting speed. In high speed should not adopt the thrust ball bearings are available in case the axial load of bearing, deep groove ball bearings mounted on the shaft, the axial displacement of the shaft or housing restrictions in bearing axial clearance range. At the same time the shell, when the hole and shaft (or outer ring of the inner ring) relative to tilt, (not more than 8-16 according to play determination) can still work properly. However, that is inclined to exist, it is necessary to reduce the service life of bearing.

Compared with other types of bearings, deep groove reali slim bearings‍ ball bearings of the same size, friction loss, high limit speed, should not be used in high speed thrust ball bearing case, available such bearings subjected to pure axial load. If we improve the manufacturing precision, and the bakelite, bronze, aluminum and other materials of the solid cage.                                                            

ship loader bearing Bearing use and coordination

To prevent corrosion of bearings, the direct use of hands to take bearings, should wash hands sweat, and coated with high quality mineral oil before operation, during the rainy season and summer with particular attention to anti rust.

Bearings with

Coordination ship loader bearing‍ selection

Inner diameter and outer diameter of rolling bearings are manufactured according to the standard tolerance, bearing inner ring and shaft, tolerance of outer ring and the seat hole degree can only through tolerance and seat hole control shaft neck to achieve. With the bearing inner ring and shaft using the basic hole system, combined with the outer ring of the bearing seat hole of the shaft.

The correct choice of cooperation, must know the actual load conditions of bearing, the working temperature and other requirements, but in fact it is very difficult. Therefore, in most truck mounted crane bearing‍ cases it is used according to the selection of fine grinding.

The size of load

The ring and the shaft or housing between the win depends on the size of the load, heavy load by win larger, lighter load by winning the smaller amount.                                                                           ‍

ferris wheel bearing The use of bearing

conditions: environmental conditions refer to the work environment and the surrounding medium lubrication points, such as air humidity, dust and corrosive medium. In contact with water or damp environment condition, can choose the grease of water resistance. Such as calcium, lithium base; harsh conditions, should be used with grease and rust, but should not use sodium base grease water resistance is poor; ferris wheel bearing‍ in the lubrication points with strong chemical medium environment, should be chemical resistant selection of fluorine element grease; in the environment with more dust, grease containing graphite thick optional; to seal with special requirements, should use sodium base grease.

5 cost factors: in the selection of grease, but also consider the economic use, comprehensive analysis using this grease is extending the lubrication cycle, charging times, fat consumption, bearing failure rate and repair cost.                                                             ‍

Use the matters needing attention

Rolling bearings Slewing drives‍ make precision parts, and therefore requested the use of the corresponding support cautious attitude, not only changing bearing high performance, if used improperly, can not achieve the expected performance, so, use of the bearing that should pay attention to the following items:

Keep the bearings and the surrounding environment clean. Even the eyes can not see the smile dirt into the bearing, also increase the bearing wear, vibration and noise.

Use the installation carefully, do not allow powerful punch, bearing‍ does not allow direct percussion bearing with a hammer, not allowed to pass through the rolling pressure.

Use tools appropriate, accurate, as far as possible the use of special tools, the use of fabric and fiber or something to avoid.             ‍

mobile crane bearing The need to use grease understanding several indexes

When the selection of products of a kind of grease when needed, we should first make clear the grease the role: antifriction, silencing, protection, sealing etc.. Antifriction grease, should consider the range of high and low temperature, load and speed; the silencing of grease, should consider mobile crane bearing‍ the adhesion, temperature range, load and speed and so on; protective grease, consideration should be given to the metal, non protective compatibility with metal; sealing grease, should consider the compatibility and seal material. Also should be selected according to the structure and environmental products grease lubricating parts of different working conditions, comprehensive up the following main indicators:

Working temperature: 1 by low temperature limit the lowest temperature of lubricating parts should be higher than the grease, otherwise it will reali slim bearings‍ increase the resistance of the highest temperature should be below the temperature limit; grease, otherwise it will lose because of grease lubrication capacity loss; the highest applicable temperature grease should be below the drop point 20 ~ 30 ℃.

2 speed: lubricating parts of the operation speed is higher, the shear stress of the lubricating grease is bigger, and the high speed dynamic mechanical temperature to rise quickly, easy to make the lubricant thinning and erosion, so we should select the consistency grease bigger.                                                                                                                                                                       3: according to the load bearing load is the key to ensure Series super thin section bearings‍ the selection of grease lubrication, lubrication points should be used for heavy load of base oil with high viscosity, thickened grease agent content is high; if can bear heavy load and shock load, should choose high extreme pressure and anti grinding grease resistance, such as the grease containing molybdenum disulfide.                                                                                        

ship loader bearing The sequential step bearing finishing

Bearing order superfinishing can generally be divided into three steps: cutting, cutting, semi finishing machining.

The first step: Bearing cutting

Convex peak surface contact surface and rough rolling stone, due to a smaller contact area, a force per unit area is larger, in certain pressure, stone first by ship loader bearing‍ bearing workpiece "anti cutting" role, the stone surface of abrasive loss and fragmentation, showing some new sharp grinding grain and edge. At the same time, surface asperity bearing workpiece by fast cutting, the cutting and anti cutting to remove the bearing surface of the workpiece and the grinding affected layer of convex peak. This stage is called the cutting stage, at this stage most of removed metal allowance.

The second step: cutting bearing

As the process continues, bearing the workpiece surface has been polished. At this time, a contact with the workpiece surface area increased, the truck mounted crane bearing‍ unit area pressure decreases, the cutting depth decreases, the cutting ability is abate. At the same time, hole stone surface is blocked, stone in the half cutting state. This stage is called semi cutting stage bearing finishing, half cutting stage cutting workpiece surface bearing traces of shallow, and the emergence of dark luster.

The third step: the finishing stage

This is the last step in ultra precision machining of bearing. With the workpiece surface to be gradually removed, the contact area of stone and workpiece surface is further increased, and, stone and bearing surface gradually by the lubricating oil film isolation, the force per unit area is very small, the cutting effect Thrust Roller Bearings‍ decreases, then automatically stop cutting. At this stage we call the finishing stage. The whole stage light surface workpiece without cutting mark, SKF bearing appears bright finished luster.

mobile crane bearing The need to use grease understanding several indexes

When the selection of products of a kind of grease when needed, we should first make clear the grease the role: antifriction, silencing, protection, sealing etc.. Antifriction grease, should consider the range of high and low temperature, load and speed; the silencing of grease, should consider mobile crane bearing‍ the adhesion, temperature range, load and speed and so on; protective grease, consideration should be given to the metal, non protective compatibility with metal; sealing grease, should consider the compatibility and seal material. Also should be selected according to the structure and environmental products grease lubricating parts of different working conditions, comprehensive up the following main indicators:

Working temperature: 1 by low temperature limit the lowest temperature of lubricating parts should be higher than the grease, otherwise it will increase the resistance of the highest temperature should be below the temperature limit; grease, otherwise it will lose because of grease lubrication capacity loss; the highest applicable temperature grease should be below the drop point 20 ~ 30 ℃.

2 speed: lubricating parts of the operation speed is higher, the shear stress of the lubricating grease is bigger, and the high speed dynamic mechanical temperature to rise quickly, easy to make the lubricant thinning and erosion, so we should select the consistency grease bigger.‍

ferris wheel bearing bearing installation

How to improve the matching precision bearing installation.

In order to improve the matching precision bearing installation, must use the measurement methods and tools do not make the bearing deformation, ferris wheel bearing‍ precision measurement of bearing inner and outer circle with the surface size of the actual project, the measurement can be related to the inner and outer diameters of all be measured, and make a comprehensive analysis of the measured data, the according to precision bearings, matching with the shaft and hole of installation parts. The distribution of shaft and hole in the actual measurement of the corresponding size and geometry, temperature and measurement should be carried out in the bearing under the same.

To guarantee the higher Single Row Ball Slewing Bearing‍ actual tie effect, the shaft and hole matched with a bearing surface, the roughness should be as small as possible.

In the above measurement, should be in the outer circle and bearing inner hole, and the corresponding surface of the shaft and the seat hole, on both sides near the assembly chamfer, respectively two groups of marker can show the maximum deviation direction, so that in the actual assembly, the match two party of maximum deviation of the same orientation so, in the assembly, the deviation can be partially offset.

The purpose of making two sets of directional signs, is the Taper roller bearings‍ deviation compensation can be considered, even supported at both ends of each rotating accuracy improved, and between the two bearing seat hole and the trunnion coaxiality error on both ends are partially eliminated. The mating surface to surface strengthening measures, such as sandblasting, precision plunger diameter slightly larger plug a hole, are beneficial to improve matching precision.                                             

ship loader bearing ball bearing

2) roller bearings, roller roller. Roller bearing press roller variety, can be divided into: cylindrical roller bearing.

The rolling bearing cylindrical roller, cylindrical roller and the length of the straight

The ratio of diameter less than ship loader bearing‍ or equal to 3; needle roller bearings, needle roller bearing is a rolling body, the needle length to diameter ratio

In 3, but the diameter is less than or equal to 5mm; tapered roller bearing

- the rolling bearings worm gear speed reducer‍ tapered roller; roller bearings by the rolling bearing spherical roller.

(3) aligning whether according to their task, divided into:

1) aligning bearings, raceway is spherical shape, can adapt to Other bearing‍ the two bearing raceway deviation angle between the axis lines and angular motion;

2) non self-aligning bearing (rigid bearing) - bearing raceway between the axis line impedance angle offset.                                        ‍

ferris wheel bearin Common classification methods of rolling bearing

1 according to the rolling bearing structure type classification

(1) according to the loading direction which can bear or nominal contact angle is different, is divided into:

1) radial bearings - important for rolling ferris wheel bearing‍ bearings bear radial load, the nominal contact angle from 0 to 45. According to nominal

The contact angle is different, can be divided into: radial bearings - Nominal

The contact angle for radial Taper roller bearings‍ bearing 0: angular contact radial bearings - nominal contact angle is larger than the radial bearings 0 to 45.

2) - an important thrust bearing used in rolling bearing under axial load, the nominal contact angle greater than 45 to 90. According to the public

Said contact angle different is divided reali slim bearings‍ into: axial contact bearing, male

Said contact angle for thrust bearing 90: thrust angular contact bearings, nominal contact angle greater than 45 but less than 90 of the thrust shaft

Bearing. ‍

mobile crane bearing off the dynamic load

off the dynamic load effect for the synthesis of radial load vector bearing ring raceway of along the circumferential direction of the rotation, are borne by the various parts of the various parts of the raceway, and accordingly passed to the shaft casing hole appearance. This is called off load dynamic mobile crane bearing‍ load, also called cyclic loading. Off the unique local dynamic load is relative to the rotating synthetic radial load vector and the ring. Take off the reproduced bearing ring and shaft or housing holes should choose clearance or interference fit. Synthesis of radial load vectors to the bearing ring raceway in the ring within a given area relative rocking, undertaken slewing rings‍ for the raceway certain region, and transmitted to the shaft or housing bore the appearance of certain region, or the effect is used for load bearing is the impact load, oscillating load, the the loading direction or digital often changes, the load is called rocking load, also called truck mounted crane bearing‍ ‍‍not the direction of load. Bearing rocking load, especially in the bear the heavy shoulder the burden, inside and outside the circle of which shall be deemed appropriate and use the interference fit. The inner rocking rotation, general inner ring that uses off the dynamic load.