CN201487049U

CN201487049U - Tapered roller bearing with high strength and low frictional moment

Info

Publication number: CN201487049U
Application number: CN2009201375108U
Authority: CN
Inventors: 陈其南; 陈德富
Original assignee: Fujian Yongan Bearing Co Ltd
Current assignee: Fujian Yongan Bearing Co Ltd
Priority date: 2009-04-09
Filing date: 2009-04-09
Publication date: 2010-05-26
Anticipated expiration: 2019-04-09

Abstract

The utility model relates to a tapered roller bearing with high strength and low frictional moment. The tapered roller bearing comprises an outer ring, an inner ring, a plurality of rollers which are arranged between the inner ring and the outer ring, play a supporting role and achieve relative rotation, and a retainer which separates the rollers and guides the rollers to move, wherein a large flange of the inner ring is an outward convex curve flange; the root width of the large flange of the inner ring is greater than 6.47 mm, and the axial depth dimension of an oil groove is less than 0.5 mm; the raceway buses and roller buses of the inner ring and the outer ring are in convexity shapes of logarithmic curves; the quantity of the rollers is less than 16, the length of the rollers is less than 24 mm and the semidiameter of a raceway convex surface is small; and the semidiameter of a cardinal plane of a roller ball is less than 136 mm, and the diameter of the rollers is greater than 21.671 mm. The tapered roller bearing has the advantages of long service life, energy conservation and consumption reduction.

Description

Tapered roller bearing with high strength and low friction torque

Technical field

The utility model relates to a kind of tapered roller bearing, particularly relates to the tapered roller bearing with high strength and low friction torque that is used on the truck ransaxle main reducing gear.

Background technique

Tapered roller bearing is a kind of mechanical basic part of standard, also is general part.The boundary dimension of each model is standard, and the size of its each part also is constant substantially.Theoretically, the bearing of same model all can be used for various operating modes as long as boundary dimension, rated load and limit speed satisfy usage requirement.Yet some special operation conditions are still distinguished to some extent to the requirement of bearing.For example, truck ransaxle main reducing gear main cone tapered roller bearing (inner bearing) is because of it bears very big thrust load, adopts general bearing often under the operating mode of overload, road conditions difference, causes the bearing inner race large-flange to break damage of bearings easily.In addition, common shaft is honoured the reduction friction torque and is not also taked special measure, and therefore, under to the more and more higher situation of the energy-conservation and environmental requirement of automobile, the friction torque that reduces bearing also is very important.

The model utility content

The purpose of this utility model is to provide a kind of tapered roller bearing with high strength and low friction torque of energy-saving durable.

The utility model comprises outer ring, inner ring, be located in and play a supportive role between them and realize counterrotating a plurality of roller and separate and the retainer of guide rolls motion that the large-flange of inner ring is the convex outer curve rib; Inner ring large-flange root width is greater than 6.47mm, and oil duct axial depth size is less than 0.5mm; Inside and outside circle raceway bus and roller bus are the logarithmic curve protuberance shape; It is little less than 24mm and raceway convex surface radius that roller quantity is less than 16, roller length; Roller ball basal plane radius is less than 136mm, and roller diameter is greater than 21.671mm.

The utlity model has following advantage: 1, bearing boundary dimension is identical with former general bearing, has satisfied the installation requirement of automobile; 2 by strengthening inner ring large-flange root width, reduces oil duct axial depth size, thereby increase rib intensity, improves axial carrying capacity, prevents that large-flange from breaking; 3 inside and outside raceways and roller bus are changed into the logarithmic curve protuberance shape and are strengthened the convexity amount by original straight line, effectively eliminate " edge stress ", improve the life-span; 4, reduce roller quantity, roller length and raceway convex surface radius (big convexity amount), reduce the rolling area of contact, reduce the viscous rolling resistance, reduce friction torque; 5, reduce roller ball basal plane radius, the inner ring large-flange is changed into the convex outer curve rib by original straight rib, improve lubricating condition, help forming hydrodynamic lubrication (oil film), alleviate sliding friction between inner ring large-flange and roller ball basal plane, reduce friction torque, and the danger of avoiding the bearing running hot running and killing, bearing life improved; 6, increase the less roller diameter of friction torque influence, remedy the decline that causes dynamic load rating because of the minimizing of roller quantity.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the sectional view of the general bearing tapered roller bearing of prior art.

Fig. 2 is the common shaft bearing outer-ring parts drawing of prior art.

Fig. 3 is the general bearing inner race parts drawing of prior art.

Fig. 4 is the common shaft bearing roller parts drawing of prior art.

Fig. 5 is a sectional view of the present utility model.

Fig. 6 is a bearing outer ring parts drawing of the present utility model.

Fig. 7 is the utility model bearing inner race parts drawing.

Fig. 8 is a bearing roller parts drawing of the present utility model.

Among Fig. 1 and Fig. 5: 1-outer ring, 2-inner ring, 3-roller, 4-retainer.

Embodiment

Comprise outer ring, inner ring, be located in and play a supportive role between them and realize counterrotating a plurality of roller and separate and the retainer of guide rolls motion as Fig. 5～the utility model shown in Figure 8, compare with the corresponding part of prior art, in the utility model: the large-flange of inner ring is the convex outer curve rib; Inner ring large-flange root width is greater than 6.47mm, and oil duct axial depth size is less than 0.5mm; Inside and outside circle raceway bus and roller bus are the logarithmic curve protuberance shape; Roller quantity is less than 16, roller length and reduces less than 24mm and raceway convex surface radius; Roller ball basal plane radius is less than 136mm, and roller diameter is greater than 21.671mm.The large-flange roughness value is less than 0.4 μ m; The ball base surface roughness value of roller is less than 0.4 μ m.The boundary dimension of conical roller bearing with low friction moment and former general bearing and wrapping angle is identical and rated load is not less than the primary standard design load.

Fig. 1～Fig. 4 is the general bearing tapered roller bearing schematic representation of prior art.By with the utility model contrast as can be known, the boundary dimension of the utility model and former general bearing and wrapping angle is identical and rated load is not less than the primary standard design load has satisfied the installation requirement of automobile.The large-flange root width of inner ring 2 is reduced to the 0.3mm of Fig. 7 by 6.97mm, the oil duct axial depth that the 6.47mm of Fig. 3 increases to Fig. 7 by the 0.5mm of Fig. 3, thereby has increased rib intensity, improves the axial carrying capacity of bearing, prevents that large-flange from breaking.It is that 8～11 μ m (test through embodiment that to detect the convexity amount can be any number between 8～11 μ m that the raceway bus of the raceway of outer ring 1 and inner ring 2 is changed into the logarithmic curve protuberance shape of Fig. 6, Fig. 7 and convexity amount by the straight line of Fig. 2, Fig. 3, comprise 8 and 11 μ m), the bus of roller 3 by Fig. 4 straight line to change into the logarithmic curve protuberance shape of Fig. 8 and convexity amount be that 9～12 μ m (test through embodiment that to detect the convexity amount can be any number between 9～12 μ m, comprise 9 and 12 μ m), effectively eliminate " edge stress ", improve the life-span.The quantity of roller 3 is reduced to 15 of Fig. 5, roller length by 16 of Fig. 1 and is reduced to the 23.3mm of Fig. 8 by the 24mm of Fig. 4, reduces the rolling area of contact, reduces the viscous rolling resistance, reduces friction torque.The ball basal plane radius of roller 3 is reduced to the 128mm of Fig. 8 by the 136mm of Fig. 4, it is that 4～6 μ m (test through embodiment that to detect the convexity amount can be any number between 4～6 μ m that the large-flange shape of inner ring 2 is changed into the convex outer curve shape of Fig. 7 and convexity amount by the straight line of Fig. 3, comprise 4 and 6 μ m), the large-flange roughness is reduced to the 0.25 μ m of Fig. 7 by the 0.4 μ m of Fig. 3, the ball base surface roughness of roller 3 is reduced to the 0.20 μ m of Fig. 8 by the 0.4 μ m of Fig. 4, improve lubricating condition, alleviate sliding friction between inner ring large-flange and roller ball basal plane, reduce friction torque.Simultaneously, the diameter of roller 3 remedies the decline that causes dynamic load rating because of the minimizing of roller quantity by the 22.994mm that the 21.671mm of Fig. 4 is increased to Fig. 8.

The utility model uses through being installed on the EQ153 truck ransaxle main reducing gear of Dongfeng brand under confidential state, under confidential state, carry out product through the nearly 3 years supporting trucies of main frame, the bearing inner race large-flange does not take place to break, the fault that causes damage of bearings has satisfied the long lifetime requirement of automobile.Solved the defective that the general bearing of former employing exists, product obtains the approval of main engine factory.Simultaneously, through honouring than test with improving preceding common shaft, friction torque has reduced by 43%, and to improving bearing life, reducing the automobile energy consumption has bigger help.

Claims

1. tapered roller bearing with high strength and low friction torque, it comprises outer ring, inner ring, be located in and play a supportive role between them and realize counterrotating a plurality of roller and separate and the retainer of guide rolls motion that it is characterized in that: the large-flange of inner ring is the convex outer curve shape; Inner ring large-flange root width is greater than 6.47mm, and oil duct axial depth size is less than 0.5mm; Inside and outside circle raceway bus and roller bus are the logarithmic curve protuberance shape; It is little less than 24mm and raceway convex surface radius that roller quantity is less than 16, roller length; Roller ball basal plane radius is less than 136mm, and roller diameter is greater than 21.671mm.

2. tapered roller bearing with high strength and low friction torque according to claim 1 is characterized in that: described large-flange roughness value is less than 0.4 μ m; The ball base surface roughness value of roller is less than 0.4 μ m.

3. tapered roller bearing with high strength and low friction torque according to claim 2 is characterized in that: the convexity amount of the large-flange convex outer curve of described inner ring is 4～6 μ m, and the large-flange root width of inner ring is 6.97mm; The oil duct axial depth is 0.3mm; The convexity amount of the raceway bus of inner ring and the raceway bus of outer ring is 8～11 μ m; The convexity amount of the bus of roller is 9～12 μ m; The quantity of roller is 15, and roller length is 23.3mm; The ball basal plane radius of roller is 128mm; The diameter of roller is 22.994mm.

4. tapered roller bearing with high strength and low friction torque according to claim 3 is characterized in that: described large-flange roughness is 0.25 μ m, and the ball base surface roughness of roller is 0.20 μ m.