CN110826162A - 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
A design method of a cage with double-half inner ring ball bearing inner and outer double-locking structure belongs to the field of bearing manufacture, and mainly aims to solve the problem that the prior cage structure can not lock steel balls in the cage to form a cage-steel ball combination body, so that when bulk bearings are disassembled and reassembled, a steel ball rotor can not ensure one-to-one correspondence with a ferrule and the cage, the invention improves and processes the prior bearing cage mainly by the width dimension B1 of an inner locking platform, the width dimension B2 of an outer locking platform, the dimension E1 of an inner locking port, the dimension E2 of the outer locking port, the dimension D4 of the bottom diameter of the outer diameter groove of the cage and the dimension D2 of the inner diameter locking platform, thereby realizing the effect that the cage can lock each steel ball in two directions, further ensuring the combination matching of the cage and the bearing, and avoiding the problem that the steel balls and the cage can not correspond when being reassembled after the bulk bearings, and the accuracy of assembly after the bearing is transported is ensured.
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-locking 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-lock structure retainer inside and outside a double-half inner ring ball bearing, aiming at solving the problem that when the prior retainer structure cannot lock a steel ball in the retainer to form a retainer-steel ball combination body and leads to batch bearing sleeve loosening and recombination, 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 an inner land width dimension B1 and an outer land width dimension B2;
step two: calculating an inner keyhole size E1 and an outer keyhole size E2;
step three: calculating the groove width dimension A2 of the outer diameter surface of the retainer
Step four: calculating the diameter D4 of the outer diameter groove bottom of the retainer;
step five: after all the size parameters in the first step and 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, the step one of calculating the inner locking step width dimension B1 and the outer locking step width dimension B2 comprises the following steps:
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 inner locking notch size E1 and the outer locking notch size E2 are calculated 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 cage pocket diameter size;
further, the step four includes the step of calculating the diameter dimension D4 of the outer diameter groove bottom of the cage 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;
further, in the fifth step, the calculation step of the diameter dimension D2 of the locking platform in the retainer 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 a locking notch in the retainer to O1O2, O4 steel ball and a contact point of the locking notch in the retainer, O1O4 as half the diameter size of a locking platform in the retainer (namely D2/2), O2O5 as half the diameter size of the steel ball (namely DW/2), O3O4 as half the diameter size of the locking notch in the retainer (namely E1/2), and O1O6 as half 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 distance from the center of the steel ball to the contact point of the steel ball and the locking opening in the retainer, namely O2O 3:
step five and step three: calculating the dimension O1O3 between the distance from the center of the retainer to the contact point of the steel ball and the locking opening in the retainer:
O1O3＝O1O6-O5O6-O2O5-O2O3 (8)
the formula (8) can be substituted with the formulae (6) and (7):
step five and four: dimension D2 for calculating the diameter of the locking platform in the cage:
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 mode 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 retarding 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
In a first specific embodiment, as shown in fig. 3 to 5, an outer diameter D1 and an inner diameter D3 of the cage are given dimensions, an inner lock opening angle α 1 is 30 degrees, an outer lock opening angle α 2 is 60 degrees, a straight line section length C of an outer lock platform can be 0.5, and the design method of the double-half inner ring ball bearing inner and outer double-locking structure cage is implemented according to the following steps:
the method comprises the following steps: calculating an inner land width dimension B1 and an outer land width dimension B2;
step two: calculating an inner keyhole size E1 and an outer keyhole size E2;
step three: calculating the groove width dimension A2 of the outer diameter surface of the retainer
Step four: calculating the diameter D4 of the outer diameter groove bottom of the retainer;
step five: after all the size parameters in the first step and 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: and (4) carrying out 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 inner lock platform width dimension B1, the outer lock platform width dimension B2, the inner lock opening dimension E1, the outer lock opening dimension E2, the retainer outer diameter surface groove width dimension A2, the retainer outer diameter groove bottom diameter dimension D4 and the retainer inner lock platform diameter dimension D2 are calculated to obtain the related inner and outer lock opening dimensions, so that the steel ball can realize a limiting effect in the lock opening, and cannot be separated from the retainer and influence the free running of the bearing.
The second embodiment is as follows: the present embodiment is 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 abutment width dimension B1 and the outer abutment 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 inner locking platform width dimension B1 and the outer locking platform width dimension B2 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 that the steel ball is prevented 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 step two described in the first embodiment, and in the present embodiment, the step of calculating the inner bezel dimension E1 and the outer bezel dimension E2 in the step two is 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.
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: 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 of calculating the cage outer diameter surface groove width dimension a2 in the step three is as follows:
A2＝A1+1.5 (4)
wherein A1 is the cage pocket diameter size;
other components and connection modes are the same as those of the first embodiment.
The fifth concrete 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 four described in the first embodiment, and in the present embodiment, the step of calculating the dimension D4 of the outer diameter groove bottom diameter 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 cage outside diameter dimension.
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 allowance after machining, so that deformation of the pocket of the retainer caused by machining resistance of the whole 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 intra-holder locking step D2 in the step five is as follows:
firstly, the following parameters O1 are determined as the center of a retainer, O2 is the center of a steel ball, O3 is the foot of a connecting line from a contact point of the steel ball and a locking notch in the retainer to O1O2, O4 steel ball and a contact point of the locking notch in the retainer, O1O4 is half of the diameter size of a locking platform in the retainer (namely D2/2), O2O5 is half of the diameter size of the steel ball (namely DW/2), O3O4 is half of the diameter size of the locking notch in the retainer (namely E1/2), and O1O6 is 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 distance from the center of the steel ball to the contact point of the steel ball and the locking opening in the retainer, namely O2O 3:
step five and step three: calculating the dimension O1O3 between the distance from the center of the retainer to the contact point of the steel ball and the locking opening in the retainer:
O1O3＝O1O6-O5O6-O2O5-O2O3 (8)
the formula (8) can be substituted with the formulae (6) and (7):
step five and four: dimension D2 for calculating the diameter of the locking platform in the cage:
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 assembly cannot be carried out, 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 combination of the retainer and the steel ball is retarded, and the locking opening of the retainer and the raceway of the inner ring of the bearing can be interfered.
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 (6)
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 an inner land width dimension B1 and an outer land width dimension B2;
step two: calculating an inner keyhole size E1 and an outer keyhole size E2;
step three: calculating the groove width dimension A2 of the outer diameter surface of the retainer;
step four: calculating the diameter D4 of the outer diameter groove bottom of the retainer;
step five: after all the size parameters in the first step and 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: and (4) carrying out quality inspection, installation and working condition simulation test on the processed retainer.
2. The method for designing the cage with the double-half inner ring ball bearing and the double-lock structure comprises the following steps: in the first step, the calculation steps of the inner locking step width dimension B1 and the outer locking step width dimension B2 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.
3. The method for designing the cage with the double-half inner ring ball bearing and the double-lock structure comprises the following steps: 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.
4. The method for designing the cage with the double-half inner ring ball bearing and the double-lock structure comprises the following steps: the step three is that the groove width dimension A2 of the outer diameter surface of the retainer is calculated as follows:
A2＝A1+1.5 (4)
where A1 is the cage pocket diameter size.
5. The method for designing the cage with the double-half inner ring ball bearing and the double-lock structure comprises the following steps: 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 cage outside diameter dimension.
6. The method for designing the cage with the double-half inner ring ball bearing and the double-lock structure comprises the following steps: in the fifth step, the diameter D2 of the inner locking platform of the retainer is calculated as follows:
firstly, the following parameters O1 are determined as the center of a retainer, O2 is the center of a steel ball, O3 is the foot of a connecting line from a contact point of the steel ball and a locking notch in the retainer to O1O2, O4 steel ball and a contact point of the locking notch in the retainer, O1O4 is half of the diameter size of a locking platform in the retainer (namely D2/2), O2O5 is half of the diameter size of the steel ball (namely DW/2), O3O4 is half of the diameter size of the locking notch in the retainer (namely E1/2), O1O6 is half of the outer diameter size of the retainer (namely D1/2),
step five, first: calculating the distance between the installed steel ball and the outer diameter of the retainer, namely O5O 6:
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 distance from the center of the steel ball to the contact point of the steel ball and the locking opening in the retainer, namely O2O 3:
step five and step three: calculating the dimension O1O3 between the distance from the center of the retainer to the contact point of the steel ball and the locking opening in the retainer: (ii) a
O1O3＝O1O6-O5O6-O2O5-O2O3 (8)
The formula (8) can be substituted with the formulae (6) and (7):
step five and four: calculating the diameter dimension D2 of the inner locking platform of the retainer:
by substituting formula (9) for formula (10)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112211900A (en) * | 2020-10-29 | 2021-01-12 | 中国航发哈尔滨轴承有限公司 | Ball bearing capable of preventing transient start-stop impact scratch damage |
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