CN201301896Y - Improved tapered roller bearing with convex capped edge - Google Patents

Abstract

The utility model relates to an improved tapered roller bearing with a convex capped edge, which comprises an inner ring, an outer ring, a roller and a retainer, wherein, a large capped edge in contact with the roller is arranged on the inner ring and comprises a transition area and a working area, wherein, the working area is of a circular arc convex shape with the requirement of linearity, and the numerical value B ranges from 0 to 0.0025 mm. The usable width of the working area to the entire capped edge surface is two thirds, and the transition area accounts for one third. The utility model has the advantages that the contact position is analyzed for optimization, the friction torque between the capped edge and the base surface of the roller ball is reduced, and the temperature rise of the bearing and the negative factors caused by vibration are reduced; furthermore, the bending resistance of the capped edge is also enhanced due to the optimization calculation of the contact position; and in addition, the oil film is easily formed on the convex profile, therefore, the friction and the lubricating environment between the capped edge and the base surface of the roller ball are improved, and the incidence of excessively quick temperature rise of the bearing is reduced.

Description

The modified model tapered roller bearing of band convex rib

Technical field

The utility model relates to the tapered roller bearing field, especially a kind of modified model tapered roller bearing with the convex rib.

Background technique

Tapered roller bearing is made up of four parts such as inner ring, outer ring, roller, retainers.Roller is that line contacts with raceway, can bear bigger radial and axial connected load, also can bear pure thrust load.The general sphere that adopts contacts with the conical surface between roller large end face and the large-flange, as shown in Figure 1.

At present, the rib contour shape of conical bearing generally adopts straight line type in the bearing industry.Situations such as stressed, lubricated, the friction the during work of the contour shape of rib and rib, heating are closely related, that is to say, the choose reasonable of rib shape is very useful to the life-span of bearing.In view of the easier formation oil film of evagination rib, and because the reducing of friction torque when stressed, the bearing heating situation also can make moderate progress, and the contour shape of rib adopts a kind of novel convex shape.

In actual design is produced, run into following problem through regular meeting:

(1) bearing edge guard and roller ball basal plane contacting points position design

Since bearing size in design or manufacture process, produce deviation, the contact position that can cause roller large end face and rib rib profile upstream and downstream from, even the big end ball of roller basal plane occurs and enter situation in the oil groove.The position of point of contact has directly influenced the bending resistance of rib, and for example contact position is too by increasing the moment of flexure that rib bears on the rib.This just requires the design of concrete size must consider the variation of contact position.

(2) friction torque problem

In fact, of the effective contact of ball basal plane be must guarantee, excessive friction and heat just are unlikely to produce with rib.It is effective method that roller ball basal plane and large-flange Contact Pair are designed to contact.In fact, owing to the error that manufactures and designs of rib and roller ball basal plane contact position, to such an extent as in the bearing operation process, the excessive situation of bearing frictional torque appears,

Temperature rise improves too fast, has a strong impact on the performance of lubricant oil, fat.The roller deflection that is caused by excessive friction torque directly causes bearing roller-raceway contact stress concentration problem in addition.This just requires the convex design of roller ball basal plane and rib rationally necessary.

(3) lubrication circumstances and Calculation of Oil Film Thickness problem

The roller ball basal plane contacts with point of contact between inner ring rib, helps forming oil film.Because roller-rib load ratio roller-raceway is much smaller, and is bigger than roller-raceway oil slick thickness usually at the oil slick thickness of rib-roller ball basal plane.But under mal-condition, under situations such as roller deflection, roller-rib can produce scratch and trickle welding phenomena.By analysis, this is relevant with roller ball basal plane fuel feeding deficiency with oil viscosity, load type and rib, need carry out computational analysis to oil slick thickness.

Summary of the invention

The utility model will solve the shortcoming of above-mentioned prior art, a kind of modified model tapered roller bearing with the convex rib is provided, to reducing sliding friction, the lubricated environment of the actual rib of improvement between roller ball basal plane and the inner ring large-flange, there is very obviously effect in the raising tapered roller bearing life-span.

The utility model solves the technological scheme that its technical problem adopts: the modified model tapered roller bearing of this band convex rib, mainly comprise inner ring, outer ring, roller and retainer, inner ring is provided with the large-flange that contacts with roller, described large-flange is made up of transition zone and working area two-part, wherein the straightness accuracy shape need of working area is the circular arc convex, and numerical value B is 0～0.0025mm.

Described working area accounts for whole rib face Effective face width 2/3, and transition zone accounts for 1/3.

The effect that the utility model is useful is: generally adopt linear rib profile at conical bearing in the industry, from the practical application angle design a kind of novel convex rib profile.Contact position is optimized analysis, makes rib and roller ball basal plane friction torque reduce, reduced the unfavorable factor that bearing temperature rise and vibration etc. produce; In addition, the computation optimization of contact position makes the bending resistance of rib also get a promotion.In addition, this convex profile forms oil film easily, has improved the friction between rib and the roller ball basal plane, lubricated environment, and the temperature rise that has reduced bearing improves too fast situation.

Description of drawings

Fig. 1 is a tapered roller bearing assembly schematic representation in the prior art;

Fig. 2 is the utility model master TV structure schematic representation;

Fig. 3 is the structure for amplifying schematic representation of A part among the utility model Fig. 2;

Fig. 4 is large-flange of the present utility model-roller ball basal plane point of action schematic representation;

Fig. 5 is that inner ring large-flange face fuel feeding of the present utility model is analyzed schematic representation;

Description of symbols: inner ring 1, outer ring 2, roller 3, retainer 4, large-flange 5, transition zone 5-1, working area 5-2, the outer chamfering 6 of large-flange, large-flange face 7, large-flange oil duct 8.

Embodiment

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

As shown in the figure, the modified model tapered roller bearing of this band convex rib, mainly comprise inner ring 1, outer ring 2, roller 3 and retainer 4, inner ring 1 is provided with the large-flange 5 that contacts with roller 3, described large-flange 5 is made up of transition zone 5-1 and working area 5-2 two-part, wherein the straightness accuracy shape need of working area 5-2 is the circular arc convex, and numerical value B is 0～0.0025mm.Described large-flange 5 plays extension 30% rib face place with the contact position of roller 3 ball basal planes at oil duct.Described working area 5-2 accounts for whole rib face Effective face width 2/3, and transition zone 5-1 accounts for 1/3.

Experiment shows, such rib structure can be effectively to the adverse effect that reduces even solution is caused by above variety of issue.

One, the contact position of guaranteeing bearing large-flange and roller ball basal plane plays extension 30% rib face place at oil duct.

With the bearing axis is transverse axis x, and the oil duct central vertical is in the straight line longitudinal axis y of transverse axis, and intersection point is an initial point.So, formula below the contact position design is adopted:

x＝tsinλ

$y=\frac{1}{2}{d}_i+\cos \mathrm{\λ}---\left(1\right)$

Wherein:

In the following formula, can optimize and revise, guarantee that contacting points position plays extension 30% rib face place at big oil duct angle parameter and roller ball radius surface.

Two, friction torque reduces.

The formula of friction torque calculates can utilize following formula:

In the formula: M---sliding friction torque between roller ball basal plane and rib

Sliding friction coefficient between μ---roller end face and rib;

e _f---the contact load point of action of roller and rib is to the distance of rib bottom;

---the semi-cone angle of tapered roller;

F _a---the axial load that bearing is subjected to.

The big oil duct of contact position of having determined rib and roller ball basal plane plays extension 30% rib face place, by formula (2) and Fig. 4 as can be known, when the contact load point of action of roller and rib to the rib bottom apart from e _fReduce, can effectively reduce the bearing frictional torque that sliding friction produced between roller ball basal plane and the rib, thereby the increasing degree of temperature rise can reduce also; In addition, the step-down of contacting points position, the moment that the rib reaction produces also can reduce, and has strengthened the bending resistance of rib.In a word, these factors all help the bearing raising in working life.

Three, the calculating of oil slick thickness

This model utility structure can effectively be controlled in the roller rotary course and produce deflection, guarantees the correct guide rolls rotation of retainer, thereby further slows down between roller and the retainer, the friction between roller and the rib.In the rolling bearing that runs up, last rolling element has just rolled across a certain position of lasso, and when oiling agent did not add to this position as yet, back one rolling element was rolled into this position again, i.e. the fuel feeding deficiency.From the tapered roller bearing structural analysis, the size of fuel delivery is relevant apart from m to the dimensionless that contacts the center with the transition zone edge, inner ring large-flange that relates in the utility model and roller ball basal plane working zone are the typical case, the size variation of the trickle shape reflection m value of rib face, large-flange face 7 two sides are respectively equipped with outer chamfering 6 of large-flange and large-flange oil duct 8.As shown in Figure 5.

When m was big, oil slick thickness was constant substantially, was decreased to a certain critical value m and work as m ^*The time, oil slick thickness begins to reduce.After the calculating of oil slick thickness finished, just can be to critical value m ^*Calculate with formula (3):

$m*=1+3.34{[{\left(\frac{\mathrm{Rx}}{b}\right)}^2\·H_{\min }]}^{0.56}---\left(3\right)$

In the formula: m ^*---the edge, lubricating oil inlet is to contacting center dimensionless distance

Rx---normal radius of curvature

B---contact ellipse semi-minor axis

H _Min---the dimensionless minimum oil film thickness

Transition zone in the utility model structure is exactly in order to have the lubricant film of bearing capacity in contacting point formation and to design.More than analyzing needs to finish by numerical analysis method, and analysis result shows that rib and roller ball basal plane contact position are lubricated good.Experimental result shows that bearing temperature rise do not occur and improves too fast phenomenon, and vibration, noise are also satisfied the criteria.Good is lubricated, has improved anti-superheat working and has stung the reliability of erosion wearing and tearing, effectively promotes bearing working life.This has actual directive significance to obtaining actual full film elastohydrodynamic lubrication.

In addition to the implementation, the utility model can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.

Claims (3)

1, a kind of modified model tapered roller bearing with the convex rib, mainly comprise inner ring (1), outer ring (2), roller (3) and retainer (4), inner ring (1) is provided with the large-flange (5) that contacts with roller (3), it is characterized in that: described large-flange (5) is made up of transition zone (5-1) and working area (5-2) two-part, wherein the straightness accuracy shape need of working area (5-2) is the circular arc convex, and numerical value B is 0～0.0025mm.

2, the modified model tapered roller bearing of band convex rib according to claim 1 is characterized in that: described large-flange (5) plays extension 30% rib face place with the contact position of roller (3) ball basal plane at oil duct.

3, the modified model tapered roller bearing of band convex rib according to claim 1 is characterized in that: described working area (5-2) accounts for whole rib face Effective face width 2/3, and transition zone (5-1) accounts for 1/3.

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