CN110296151B - Design and verification method of injection molding snap ring bearing - Google Patents
Design and verification method of injection molding snap ring bearing Download PDFInfo
- Publication number
- CN110296151B CN110296151B CN201910514903.4A CN201910514903A CN110296151B CN 110296151 B CN110296151 B CN 110296151B CN 201910514903 A CN201910514903 A CN 201910514903A CN 110296151 B CN110296151 B CN 110296151B
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- China
- Prior art keywords
- bearing
- injection molding
- snap ring
- deep groove
- groove ball
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/073—Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/12—Force, load, stress, pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/42—Groove sizes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/70—Diameters; Radii
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses a design and verification method of an injection molding snap ring for a deep groove ball bearing, which comprises the following steps: (1) confirming the outer diameter of a bearing injection molding snap ring and the torque of a bearing input shaft according to the working condition of the selected bearing model; (2) obtaining the friction force between the injection molding snap ring and the bearing seat according to a moment balance equation, and obtaining the pressure F generated by interference after the bearing is installed through Hooke's law; (3) and (3) obtaining the width b of the injection molding groove according to the parameters in the step (2). The method has the advantages that the effective wall thickness calculation concept of the deep groove ball bearing is innovatively provided, and the rationality of the depth and the width of the injection molding snap ring is verified in an effective wall thickness mode; the application of the product in the market feeds back that the wall thickness under the parameter can meet the service life requirement of the bearing, the empirical parameters t and h are obtained, injection molding snap rings with different groove depths and groove widths are designed for deep groove ball bearings with different specifications, and the design standard is unified.
Description
Technical Field
The invention relates to the field of bearing manufacturing, in particular to the field of deep groove ball injection molding bearing manufacturing.
Background
With the rapid development of Chinese economy, the demand of bearings as key parts of various machines is rapidly increasing, thereby driving the rapid development of the bearing manufacturing industry in China. The original bearing enterprises in China continuously enlarge the production scale, new enterprises continuously emerge, and world famous bearing manufacturers also spend time investing in China to build plants to participate in market share competition and export. Bearing production and export rates have increased annually in China over the last decade, and the market has put higher demands on bearing performance and processing. The original single-row radial ball bearing of a deep groove ball bearing (GB/T276-1994) is a rolling bearing which is most widely applied. The basic deep groove ball bearing is composed of an outer ring, an inner ring, a group of steel balls and a group of retainers. The injection molding snap ring is arranged between the deep groove ball bearing and the rotating shaft to prevent the deep groove ball bearing from axially moving, the structure, particularly the depth and the width of the injection molding snap ring have important influence on the installation quality of the deep groove ball bearing, the determination of the depth and the width of the existing injection molding snap ring is completely empirical, a unified standard is not met, and qualitative calculation is not carried out.
Disclosure of Invention
The invention provides a design and verification method of an injection snap ring for a deep groove ball bearing, aiming at solving the technical problem that the groove width and the groove depth of the injection snap ring are not calculated qualitatively in the design and installation of the existing deep groove ball bearing.
The technical scheme of the invention is as follows: a design method of an injection molding snap ring for a deep groove ball bearing comprises the following steps: (1) confirming the outer diameter of a bearing injection molding snap ring and the torque of a bearing input shaft according to the working condition of the selected bearing model; (2) obtaining the friction force between the injection molding snap ring and the bearing seat according to a moment balance equation, and obtaining the pressure F generated by interference after the bearing is installed through Hooke's law; (3) and (3) obtaining the width b of the injection molding groove according to the parameters in the step (2).
In the scheme, the torque of the bearing input shaft is obtained according to a moment balance equation
In the formula: mTransfusion systemIs the torque of the input shaft; f1Injecting friction between a clamping ring and a bearing seat for the bearing; d is the outer diameter of the bearing injection molding snap ring; the conditions that the injection molding snap ring does not lose efficacy in the using process are as follows: f1Not more than mu F, the elastic modulus of the injection molding snap ring is E, and the interference magnitude E during bearing installation can be obtained according to Hooke's law:
in the formula: sigma is the stress, epsilon is the strain,
f is the pressure generated by the interference between the injection-molded snap ring and the bearing seat, the contact area S of the injection-molded snap ring is 2 pi bD,
the width of the injection molding groove is
d2The diameter of the outer ring flange and the width a of the injection molding groove from the end face are rmax+0.5，rmaxThe bearing outer ring is the largest chamfer angle.
A method for verifying the design of injection-moulded snap ring for deep-groove ball bearing features that the effective wall thickness H ═ t × D of deep-groove ball bearing is setWDw is the diameter of the steel ball, t is an empirical parameter, and the depth of the injection molding snap ring is selected through calculation of the effective wall thickness of the deep groove ball bearing
Simultaneously verifying whether H satisfies that D-De-H is larger than or equal to H, and if not, adjusting, wherein De is the diameter of the groove bottom of the outer ring, D is the outer diameter of the injection molding snap ring of the bearing, and D is2Is the diameter of the outer ring flange.
In the scheme, the effective wall thickness parameter t is 0.28, 0.26, 0.25, 0.3 and 0.3 for deep groove ball bearings with diameters of 0, 2, 3, 18 and 19 series respectively.
The method has the advantages that the effective wall thickness calculation concept of the deep groove ball bearing is innovatively provided, and the rationality of the depth and the width of the injection molding snap ring is verified in an effective wall thickness mode; the application of the product in the market feeds back that the wall thickness under the parameter can meet the service life requirement of the bearing, the empirical parameters t and h are obtained, injection molding snap rings with different groove depths and groove widths are designed for deep groove ball bearings with different specifications, and the design standard is unified.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below by combining the embodiment. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments based on the embodiments in the present invention, without any inventive work, will be apparent to those skilled in the art from the following description.
(1) Confirming the outer diameter of a bearing injection molding snap ring and the torque of a bearing input shaft according to the working condition of the selected bearing model;
(2) obtaining the friction force between the injection molding snap ring and the bearing seat according to a moment balance equation, and obtaining the pressure generated by interference after the bearing is installed through Hooke's law;
(3) selecting the depth of the injection molding snap ring through the calculation of the effective wall thickness of the deep groove ball bearing;
(4) the condition that the bearing does not lose efficacy in the using process is that the bearing is subjected to external force and is smaller than the maximum static friction force of the bearing, and the minimum width of the injection molding snap ring of the bearing is obtained by using dynamic friction force instead of static friction force.
The effective wall thickness of the deep groove ball bearing is not calculated in the bearing design theory, and the method is used for analyzing a large amount of dataThe effective wall thickness of the deep groove ball bearings of different models is related to the steel balls, and effective wall thickness parameters t of the deep groove ball bearings are introduced, wherein the effective wall thickness H of the deep groove ball bearings is as follows: h ═ t × DWAnd obtaining the value of the effective wall thickness parameter t of the deep groove ball bearing through data analysis as follows:
taking 0.28, 0.26, 0.25, 0.3 and 0.3 as effective wall thickness parameters t of deep groove ball bearings with diameters of 0, 2, 3, 18 and 19 series respectively; the design life requirement of the deep groove ball bearing can be met when the wall thickness of the deep groove ball bearing is larger than the effective wall thickness, and the deep groove ball bearing has great risk and is fatigue failure when the wall thickness is smaller than the effective wall thickness.
The injection molding deep groove ball bearing meets the following requirements when the injection molding groove depth h is taken as a value: D-DeH is more than or equal to H, because the strength of the grooved position is reduced after the bearing is provided with the injection molding groove, and the residual wall thickness of the outer ring of the bearing except the grooved thickness is not less than the effective wall thickness of the bearing in order to ensure that the bearing can reach the designed fatigue life. The depth h of the injection molding groove is as follows:
and (5) verifying whether h meets the effective wall thickness calculation of the deep groove ball, and if not, adjusting.
According to the moment balance equation
In the formula: mTransfusion systemIs the torque of the input shaft; f1Injecting friction between a clamping ring and a bearing seat for the bearing; d is the outer diameter of the bearing injection molding snap ring; the conditions that the injection molding snap ring does not lose efficacy in the using process are as follows: f1Not more than mu F, the elastic modulus of the injection molding snap ring is E, and the interference magnitude E during bearing installation can be obtained according to Hooke's law:
in the formula: sigma is the stress, epsilon is the strain,
f is the pressure generated by the interference between the injection-molded snap ring and the bearing seat, the contact area S of the injection-molded snap ring is 2 pi bD,
the width of the injection molding groove is
d2The diameter of the outer ring flange and the width a of the injection molding groove from the end face are rmax+0.5，rmaxThe bearing outer ring is the largest chamfer angle.
Claims (3)
1. A design method of an injection molding snap ring for a deep groove ball bearing is characterized by comprising the following steps: (1) confirming the outer diameter of a bearing injection molding snap ring and the torque of a bearing input shaft according to the working condition of the selected bearing model; (2) obtaining the friction force between the injection molding snap ring and the bearing seat according to a moment balance equation, and obtaining the pressure F generated by interference after the bearing is installed through Hooke's law; (3) obtaining the width b of the injection molding groove according to the parameters in the step (2); the torque of the bearing input shaft is obtained according to a moment balance equation
In the formula: mTransfusion systemIs the torque of the input shaft; f1Injecting friction between a clamping ring and a bearing seat for the bearing; d is the outer diameter of the bearing injection molding snap ring; the conditions that the injection molding snap ring does not lose efficacy in the using process are as follows: f1Not more than mu F, the elastic modulus of the injection molding snap ring is E, and the interference magnitude E during bearing installation can be obtained according to Hooke's law:
in the formula: sigma is the stress, epsilon is the strain,
f is the pressure generated by the interference between the injection-molded snap ring and the bearing seat, the contact area S of the injection-molded snap ring is 2 pi bD,
h is the depth of the injection molded snap ringThe width of the plastic groove is
d2The diameter of the outer ring flange and the width a of the injection molding groove from the end face are rmax+0.5，rmaxThe bearing outer ring is the largest chamfer angle.
2. The design method of the injection molding snap ring for the deep groove ball bearing as claimed in claim 1, characterized in that: the verification method comprises the following steps: setting the effective wall thickness H ═ t × D of the deep groove ball bearingWDw is the diameter of the steel ball, t is an empirical parameter, and the depth of the injection molding snap ring is selected through calculation of the effective wall thickness of the deep groove ball bearing
Simultaneously verifying whether H satisfies that D-De-H is larger than or equal to H, and if not, adjusting, wherein De is the diameter of the groove bottom of the outer ring, D is the outer diameter of the injection molding snap ring of the bearing, and D is2Is the diameter of the outer ring flange.
3. The design method of the injection molding snap ring for the deep groove ball bearing as claimed in claim 2, characterized in that: the effective wall thickness parameter t is 0.28, 0.26, 0.25, 0.3 and 0.3 respectively for deep groove ball bearings with the diameters of 0, 2, 3, 18 and 19 series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910514903.4A CN110296151B (en) | 2019-06-14 | 2019-06-14 | Design and verification method of injection molding snap ring bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910514903.4A CN110296151B (en) | 2019-06-14 | 2019-06-14 | Design and verification method of injection molding snap ring bearing |
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| Publication Number | Publication Date |
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| CN110296151A CN110296151A (en) | 2019-10-01 |
| CN110296151B true CN110296151B (en) | 2021-03-16 |
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| CN201910514903.4A Active CN110296151B (en) | 2019-06-14 | 2019-06-14 | Design and verification method of injection molding snap ring bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3461280B1 (en) * | 2016-06-15 | 2022-02-16 | Ortadogu Rulman Sanayi Ve Ticaret Anonim Sirketi | A bearing which can be quickly assembled and disassembled |
| CN108317175A (en) * | 2017-12-20 | 2018-07-24 | 安徽日飞轴承有限公司 | Bearing outer ring, dustproof cover and its application in deep groove ball bearing |
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