CN110826162B - Design method of double-half inner ring ball bearing inner and outer double-locking structure retainer - Google Patents
Design method of double-half inner ring ball bearing inner and outer double-locking structure retainer Download PDFInfo
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Abstract
The invention relates to a design method of a retainer with an internal and external double-locking structure of a double-half inner ring ball bearing, which belongs to the field of bearing manufacturing and mainly aims to solve the problem that a retainer-steel ball combination cannot be formed by locking steel balls in the retainer by the existing retainer structure, so that when bulk bearings are disassembled and assembled, a steel ball rotor, a ferrule and the retainer cannot be in one-to-one correspondence.
Description
Technical Field
The invention belongs to the field of bearing manufacturing, and particularly relates to a design method of a double-half inner ring ball bearing inner and outer double-lock structure retainer.
Background
The double-half inner ring ball bearing is widely applied to a main shaft of a high-speed turbine and bears bidirectional axial load and radial load, and is structurally characterized in that the bearing consists of two halves of separable ferrules, and the bearing capacity can be designed in a matching manner according to a bearing contact angle. The retainer in the bearing mainly serves to separate the rolling bodies and avoid mutual extrusion, collision and abrasion of the rolling bodies, the high-speed turbine main shaft thrust double-half inner ring ball bearing adopts an inner guide or outer guide solid retainer, and the retainer is simple and reasonable in structure and can meet the requirement of the bearing operation function.
The double-half inner ring ball bearing belongs to a separable bearing, bearing inspection, transportation, process turnover and assembly are easy to loose, particularly after bearing loose sleeves are batched, because the surfaces of steel balls cannot be numbered and cannot correspond to a ferrule and a retainer one by one, the probability of mixed loading after the bearing loose sleeves is extremely high, and after the steel balls with different groups are mixed, the contact stress of individual steel balls is too large, so that the bearing is too early peeled off and fails, and the use reliability of the bearing is influenced. The existing retainer structure cannot lock the steel ball in the retainer to form a retainer-steel ball assembly, and cannot meet the requirement that a user can correspondingly assemble the double-half inner ring ball bearing again according to part numbers after separating.
Disclosure of Invention
The invention provides a design method of a double-half inner ring ball bearing inner and outer double-lock structure retainer, which aims to solve the problem that when the prior retainer structure cannot lock a steel ball in the retainer to form a retainer-steel ball combined body, so that batch bearing loose sleeve recombination is caused, the steel ball, a ferrule and the retainer cannot be ensured to be in one-to-one correspondence;
the design method of the double-half inner ring ball bearing inner and outer double-locking structure retainer is realized according to the following steps:
the method comprises the following steps: calculating the width dimension B1 of the inner locking platform and the width dimension B2 of the outer locking platform;
step two: calculating the size E1 of the inner lock opening and the size E2 of the outer lock opening;
step three: calculating the groove width dimension A2 of the outer diameter surface of the retainer
Step four: calculating the diameter D4 of the bottom of the outer diameter groove of the retainer;
step five: after all the size parameters in the first step to the third step are determined, calculating the diameter D2 of the locking platform in the retainer;
step six: processing the retainer according to the parameter size obtained in the first step to the fifth step;
step seven: the processed retainer is subjected to quality inspection, installation and working condition simulation test;
further, in the first step, the calculation of the width dimension B1 of the inner locking platform and the width dimension B2 of the outer locking platform is as follows:
B1＝B2＝(0.35～0.4)×DW (1)
in the formula, DW is the diameter size of the steel ball in the double-half inner ring ball bearing;
further, in the second step, the calculation steps of the inner lock opening size E1 and the outer lock opening size E2 are as follows:
E1＝DW-ε1 (2)
E2＝DW-ε2 (3)
in the formula, the locking amount of an epsilon 1-inner lock opening is selected from 0.1-0.2;
epsilon 2-locking amount of the outer locking notch, and 0.02-0.04 is selected;
further, the step of calculating the groove width dimension A2 of the outer diameter surface of the cage in the step three is as follows:
A2＝A1+1.5 (4)
wherein A1 is the diameter size of the cage pocket;
further, the step four includes the following steps of calculating the diameter D4 of the outer diameter groove bottom of the retainer:
D4＝D1-s (5)
wherein s is the allowance after processing and is selected to be 1.5-1.7;
d1 is the outer diameter of the retainer;
further, in the fifth step, the calculation of the diameter D2 of the locking platform in the holding frame is as follows:
firstly, determining the following parameters O1 as the center of a retainer, O2 as the center of a steel ball, O3 as the foot of a connecting line from a contact point of the steel ball and an inner locking opening of the retainer to O1O2, O4 as the contact point of the steel ball and the inner locking opening of the retainer, O1O4 as half of the diameter size of an inner locking platform of the retainer (namely D2/2), O2O5 as half of the diameter size of the steel ball (namely DW/2), O3O4 as half of the size of the inner locking opening of the retainer (namely E1/2), and O1O6 as half of the outer diameter size of the retainer (namely D1/2);
step five, first: calculating the size O5O6 of the distance from the installed steel ball to the outer diameter of the retainer;
O5O6＝O1O6-X/2＝D1/2-X/2 (6)
when X is the internal locking of the steel ball, the back allowance between the outer compound circle of the steel ball and the outer diameter of the retainer is selected to be 2
Step five two: calculating the size O2O3 of the distance from the center of the steel ball to the contact point of the steel ball and the inner lock opening of the retainer:
step five and step three: calculating the size O1O3 from the center of the retainer to the distance between the steel ball and the contact point of the locking opening in the retainer:
O1O3＝O1O6-O5O6-O2O5-O2O3 (8)
substituting the formulas (6) and (7) into the formula (8) can obtain:
step five and four: calculating the diameter D2 of the inner lock platform of the retainer:
by substituting formula (9) for formula (10)
Compared with the prior art, the invention has the following beneficial effects:
the design method of the double-half inner ring ball bearing inner and outer double-locking structure retainer provided by the invention changes the existing retainer structure, and the inner and outer double-locking structure is added on the existing retainer, so that the steel balls and the retainer are inseparable combined bodies, and the risks of poor mixing and mixed loading of the steel balls when the bearing is re-assembled after being transported in a loose sleeve manner are avoided. Meanwhile, the relevant structure size of the retainer is reasonable, the steel ball and the newly added locking notch cannot interfere, and the problem of blocking the free running of the bearing cannot occur in the locking notch.
Drawings
FIG. 1 is a front cross-sectional view of a cage without a locking notch;
FIG. 2 is a side cross-sectional view of a non-cage retainer;
FIG. 3 is a side cross-sectional view of a cage design of the present invention;
FIG. 4 is a front cross-sectional view of a cage design of the present invention;
FIG. 5 is a schematic view of the contact between the steel ball and the inner locking notch of the retainer designed according to the present invention.
Detailed Description
The first embodiment is as follows: as shown in fig. 3 to 5, the outer diameter D1 and the inner diameter D3 of the retainer are given dimensions, the angle α 1 of the inner lock opening is 30 °, the angle α 2 of the outer lock opening is 60 °, the length C of the straight line segment of the outer lock platform is 0.5, and the method for designing the retainer with the double-half inner ring ball bearing inner and outer double-locking structure is implemented according to the following steps:
the method comprises the following steps: calculating the width dimension B1 of the inner locking platform and the width dimension B2 of the outer locking platform;
step two: calculating the size E1 of the inner lock opening and the size E2 of the outer lock opening;
step three: calculating the groove width dimension A2 of the outer diameter surface of the retainer
Step four: calculating the diameter D4 of the bottom of the outer diameter groove of the retainer;
step five: after all the size parameters in the first step to the third step are determined, calculating the diameter D2 of the inner locking platform of the retainer;
step six: processing the retainer according to the parameter size obtained in the first step to the fifth step;
step seven: and performing quality inspection, installation and working condition simulation test on the processed retainer.
In the embodiment, according to the known amounts of the inner diameter and the outer diameter of the existing retainer and the diameter of the steel ball, the width dimension B1 of the inner locking platform, the width dimension B2 of the outer locking platform, the dimension E1 of the inner locking opening, the dimension E2 of the outer locking opening, the width dimension A2 of the surface groove of the outer diameter of the retainer, the diameter dimension D4 of the bottom of the outer diameter groove of the retainer and the diameter dimension D2 of the inner locking platform of the retainer are calculated to obtain the dimensions of the inner locking opening and the outer locking opening, so that the steel ball can realize a limiting effect in the locking opening, and cannot be separated from the retainer and influence on the free running of the bearing.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 3 to 5, and the present embodiment further defines the first step of the first embodiment, and in the present embodiment, the steps of calculating the inner stage width dimension B1 and the outer stage width dimension B2 in the first step are as follows:
B1＝B2＝(0.35～0.4)×DW (1)
in the formula, DW is the diameter size of the steel ball in the double-half inner ring ball bearing.
Other components and connection modes are the same as those of the first embodiment.
In the embodiment, the diameter ratio of the width dimension B1 of the inner locking platform and the width dimension B2 of the outer locking platform to the diameter ratio of the steel ball in the double-half inner ring ball bearing is selected to be 0.35-0.4, so that the steel ball is effectively locked, the weight of the bearing is reduced as much as possible on the premise of preventing the steel ball from falling off from the inner diameter and the outer diameter, the running resistance of the bearing steel ball-retainer combination is reduced, the lubricating flow performance inside the bearing is improved, and the internal scattering of the bearing is facilitated.
The third concrete implementation mode: the present embodiment will be described with reference to fig. 3 to 5, and the present embodiment further defines the second step described in the first embodiment, and in the present embodiment, the calculation steps of the inner bezel dimension E1 and the outer bezel dimension E2 in the second step are as follows:
E1＝DW-ε1 (2)
E2＝DW-ε2 (3)
wherein epsilon 1-inner lock locking quantity is selected to be 0.1-0.2;
epsilon 2-locking amount of the outer locking notch, and is selected from 0.02-0.04.
Other components and connection modes are the same as those of the first embodiment.
In the embodiment, the locking amount of the inner lock opening is selected to be 0.1-0.2, so that the steel ball is well limited and cannot fall off from the inner lock opening, the locking amount of the outer lock opening is selected to be 0.02-0.04, so that the steel ball can be embedded from the outer lock opening, and when the bearing works, the steel ball keeps a certain distance from the lock opening, so that the steel ball is ensured not to interfere with the position of the lock opening of the retainer when in operation.
The fourth concrete implementation mode is as follows: the present embodiment will be described with reference to fig. 3 to 5, and the present embodiment further defines the step three described in the first embodiment, and in the present embodiment, the step A2 of calculating the outer diameter surface groove width dimension of the cage in the step three is as follows:
A2＝A1+1.5 (4)
wherein A1 is the diameter size of the cage pocket;
other components and connection modes are the same as those of the first embodiment.
The fifth concrete implementation mode is as follows: the present embodiment will be described with reference to fig. 3 to 5, and the present embodiment further defines the step four described in the first embodiment, and in the present embodiment, the step of calculating the dimension of the outer diameter groove bottom diameter D4 of the cage in the step four is as follows:
D4＝D1-s (5)
wherein s is the allowance after processing and is selected to be 1.5-1.7;
d1 is the outer diameter of the retainer.
Other components and connection modes are the same as those of the first embodiment.
In the embodiment, s is selected to be 1.5-1.7 for the allowance after machining, so that the deformation of the pocket hole of the retainer caused by the whole machining resistance borne by the outer diameter surface in the machining process is avoided, and the formation of the outer locking platform is ensured.
The sixth specific implementation mode: the present embodiment will be described with reference to fig. 3 to 5, and the present embodiment is further limited to the step five described in the first embodiment, and in the present embodiment, the step of calculating the diameter dimension D2 of the lock bed in the holder in the step five is as follows:
firstly, determining the following parameters O1 as the center of the retainer, O2 as the center of the steel ball, O3 as the foot of the connection line from the contact point of the steel ball and the inner locking opening of the retainer to O1O2, O4 as the contact point of the steel ball and the inner locking opening of the retainer, O1O4 as the half of the diameter size of the inner locking platform of the retainer (namely D2/2), O2O5 as the half of the diameter size of the steel ball (namely DW/2), O3O4 as the half of the size of the inner locking opening of the retainer (namely E1/2), and O1O6 as the half of the outer diameter size of the retainer (namely D1/2)
Step five, first: calculating the size O5O6 of the distance from the installed steel ball to the outer diameter of the retainer;
O5O6＝O1O6-X/2＝D1/2-X/2 (6)
when X is the internal locking of the steel ball, the back allowance between the outer compound circle of the steel ball and the outer diameter of the retainer is selected to be 2
Step five two: calculating the size O2O3 of the distance from the center of the steel ball to the contact point of the steel ball and the inner lock opening of the retainer:
step five, step three: calculating the size O1O3 from the center of the retainer to the distance between the steel ball and the contact point of the locking opening in the retainer:
O1O3＝O1O6-O5O6-O2O5-O2O3 (8)
substituting the formulas (6) and (7) into the formula (8) can obtain:
step five and four: calculating the diameter D2 of the inner lock platform of the retainer:
by substituting formula (9) for formula (10)
Other components and connection modes are the same as those of the first embodiment.
The diameter D2 of the inner lock platform of the retainer calculated in the embodiment is particularly important, the diameter D2 of the inner lock platform of the retainer directly influences the locking effect of the bearing, the diameter D2 of the inner lock platform of the retainer calculated in the step is a critical optimal value, if the diameter D2 of the inner lock platform of the retainer is too large, a steel ball directly protrudes out of the outer diameter surface, the bearing cannot be assembled, if the diameter D2 of the inner lock platform of the retainer is too small, the weight of the retainer is directly too large, the operation of the retainer-steel ball assembly is retarded, and the interference between a lock opening of the retainer and a raceway of an inner ring of the bearing can be possibly caused.
The present invention is not limited to the above embodiments, and any person skilled in the art can make many modifications and equivalent variations by using the above-described structures and technical contents without departing from the scope of the present invention.
Claims (1)
1. The design method of the double-half inner ring ball bearing inner and outer double-locking structure retainer is characterized in that: the method is realized according to the following steps:
the method comprises the following steps: calculating the width dimension B1 of the inner locking platform and the width dimension B2 of the outer locking platform;
the calculation steps of the width dimension B1 of the inner locking platform and the width dimension B2 of the outer locking platform in the first step are as follows:
B1＝B2＝(0.35～0.4)×DW (1)
in the formula, DW is the diameter size of the steel ball in the double-half inner ring ball bearing;
step two: calculating the size E1 of the inner lock opening and the size E2 of the outer lock opening;
in the second step, the calculation steps of the inner lock opening size E1 and the outer lock opening size E2 are as follows:
E1＝DW-ε1 (2)
E2＝DW-ε2 (3)
in the formula, the locking amount of an epsilon 1-inner lock opening is selected from 0.1-0.2;
epsilon 2-locking amount of the outer locking notch, and 0.02-0.04 is selected;
step three: calculating the groove width dimension A2 of the outer diameter surface of the retainer;
the step three is that the calculation steps of the groove width A2 of the outer diameter surface of the retainer are as follows:
A2＝A1+1.5 (4)
wherein A1 is the diameter size of the cage pocket;
step four: calculating the diameter D4 of the bottom of the outer diameter groove of the retainer;
the step four is that the calculation of the diameter D4 of the outer diameter groove bottom of the retainer comprises the following steps:
D4＝D1-s (5)
wherein s is the allowance after processing and is selected to be 1.5-1.7;
d1 is the outer diameter of the retainer;
step five: after all the size parameters in the first step to the third step are determined, calculating the diameter D2 of the locking platform in the retainer;
in the fifth step, the diameter D2 of the inner locking platform of the retainer is calculated as follows:
firstly, determining the following parameters O1 as the center of a retainer, O2 as the center of a steel ball, O3 as the foot of a connecting line from a contact point of the steel ball and an inner locking opening of the retainer to O1O2, O4 as the contact point of the steel ball and the inner locking opening of the retainer, O1O4 as half of the diameter size of an inner locking platform of the retainer, namely D2/2, O2O5 as half of the diameter size of the steel ball, namely DW/2, O3O4 as half of the size of the inner locking opening of the retainer, namely E1/2, O1O6 as half of the outer diameter size of the retainer, namely D1/2,
step five: calculating the size O5O6 of the distance from the installed steel ball to the outer diameter of the retainer:
O5O6＝O1O6-X/2＝D1/2-X/2 (6)
when X is the internal locking of the steel ball, the back allowance between the outer compound circle of the steel ball and the outer diameter of the retainer is selected to be 2
Step two: calculating the size O2O3 of the distance from the center of the steel ball to the contact point of the steel ball and the inner lock opening of the retainer:
step five and step three: calculating the size O1O3 from the center of the retainer to the distance between the steel ball and the contact point of the locking opening in the retainer:
O1O3＝O1O6-O5O6-O2O5-O2O3 (8)
substituting the formulas (6) and (7) into the formula (8) can yield:
step five four: calculating the diameter D2 of the inner locking platform of the retainer:
by substituting formula (9) for formula (10)
Step six: processing the retainer according to the parameter size obtained in the first step to the fifth step;
step seven: and (4) carrying out quality inspection, installation and working condition simulation test on the processed retainer.
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