JP2007040446A - Rolling bearing for automobile electric equipment/accessory - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent flaking on a rolling/sliding surface caused by hydrogen embrittlement. <P>SOLUTION: A grease composition filled in a rolling bearing for automobile electric equipment/accessory is obtained by mixing an additive into a base grease comprising a base oil and a thickener. The additive comprises at least one bismuth additive selected out of inorganic bismuth and organic bismuth containing no sulfur component, and the mixing ratio of the bismuth additive is 1.05-10 pts.wt. to 100 pts.wt. of the base grease. The inorganic bismuth is at least one inorganic bismuth selected out of bismuth trioxide, bismuth powder and bismuth carbonate, and the organic bismuth is organic acid bismuth. The thickener is a urea-based thickener, and the base oil is at least one oil selected out of alkyl diphenyl ether oil and poly-α-olefin oil. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a rolling bearing for automobile electrical equipment / auxiliary machinery, and more particularly, to a motor electrical component such as a fan coupling device, an alternator, an idler pulley, an electromagnetic clutch for a car air conditioner, an electric fan motor, and a rolling bearing for auxiliary machinery.

In recent years, along with demands for miniaturization, weight reduction and quietness improvement of automobiles, miniaturization, weight reduction and sealing of engine compartments have been attempted for the electrical parts and auxiliary parts. The demand for high output and high efficiency is increasing in the performance of the engine itself, and in the electrical equipment in the engine room, a method is used to compensate for the decrease in output caused by downsizing by rotating at high speed. .
Hereinafter, outlines of a rolling bearing for a fan coupling device, a rolling bearing for an alternator for an automobile, and a rolling bearing for an idler pulley will be described as examples of the rolling bearing for an electric vehicle / auxiliary machine.

A fan coupling device for automobiles has a housing in which viscous fluid is sealed inside and a fan for blowing air on the outer peripheral surface is connected to a rotor directly connected to the engine via a bearing, and increases or decreases in response to the ambient temperature. It is a device that performs optimum ventilation corresponding to the engine temperature by controlling the amount of drive torque transmitted from the engine and the rotational speed of the fan using the shearing resistance of the viscous fluid.
For this reason, the rolling bearings for fan coupling devices have a rotational speed of 10000 rpm at a high temperature of 180 ° C or higher during high-speed operation in summer, in addition to uneven rotation that varies from 1000 rpm to 10000 rpm as the engine temperature fluctuates. Heat resistance, grease sealability, and durability that can withstand extremely harsh environments such as high-speed rotation at rpm or higher are required.

The alternator for automobiles has a function of generating power by receiving rotation of an engine with a belt, supplying electric power to an electric load of the vehicle, and charging a battery. For this reason, rolling bearings for alternators are required to have heat resistance, grease sealability and durability that can withstand extremely harsh environments such as high-speed rotations of 10,000 rpm or higher at high temperatures of 180 ° C or higher.
By adopting a terpolymer of vinylidene fluoride-tetrafluoroethylene-propylene or a binary copolymer of tetrafluoroethylene-propylene as an elastic body of a seal member that requires heat resistance and durability, In this combination, a method for improving the durability of the rolling bearing is known (see Patent Document 1).

  Further, the present applicant uses grease containing a urea compound as a rolling bearing for a fan coupling device and a rolling bearing for an alternator, and a rubber molded body that comes into contact with at least the grease as a seal member for sealing the grease And the rubber molded body contains tetrafluoroethylene, propylene, and a crosslinking monomer comprising a unsaturated monomer having 2 to 4 carbon atoms in which some of the hydrogen atoms are substituted with fluorine atoms. An application has been filed for rolling bearings using a vulcanizable fluororubber molded body composed of a coalescence (Japanese Patent Application Nos. 2004-7084 and 2004-67092).

The idler pulley for automobiles is used as a belt tensioner for a drive belt that transmits engine rotation to the auxiliary equipment of the automobile, and is used to apply tension as a tensioner to the belt when the center distance is fixed. The function as a pulley is combined with the function as an idler that is used to change the running direction of the belt or to avoid an obstacle to reduce the volume of the engine compartment.
For this reason, idler pulley rolling bearings are required to have heat resistance, grease sealability, and durability that can withstand extremely harsh environments such as high-speed rotations of 10,000 rpm or higher at high temperatures of 180 ° C or higher.
As a grease composition suitable for rolling bearings used at high temperature and high speed, an amide wax having a melting point of 80 ° C or higher, which has an antioxidant ability for base oil, is blended in the grease composition at 0.5 to 10% by weight, and 40 ° C. Grease formulated with a base oil with a kinematic viscosity of 20 to 150 mm ² / sec and a thickener of the grease composition is a urea thickener, and 5 to 30% by weight based on the total grease composition A composition is known (see Patent Document 2).

However, due to severe usage conditions, specific peeling accompanied with white structure change occurs early on the rolling surface of the rolling bearing, which is a problem.
This specific exfoliation is different from the exfoliation from the inside of the rolling contact surface caused by normal metal fatigue, and is a fracture phenomenon that occurs from a relatively shallow portion of the surface of the rolling contact surface and is considered to be hydrogen embrittlement caused by hydrogen.
As a method for preventing such a specific peeling phenomenon accompanied by a white tissue change that occurs at an early stage, for example, a method of adding a passivating agent to a grease composition or a method of adding bismuth dithiocarbamate is known ( (See Patent Document 3 and Patent Document 4).
However, with the recent increase in the usage conditions of rolling bearings used in automobile electrical equipment and accessories, it has become impossible to take sufficient measures with the method of adding a passivating agent.
JP 2001-66578 A JP 2003-105366 A JP-A-3-210394 JP-A-2005-42102

  The present invention has been made to cope with such a problem, and an automobile capable of effectively preventing separation on a rolling surface due to hydrogen embrittlement under the use conditions of a rolling bearing used in automobile electrical equipment and auxiliary equipment. The purpose is to provide rolling bearings for electrical equipment and auxiliary equipment.

  An automotive electrical equipment / auxiliary rolling bearing according to the present invention is an automotive electrical equipment / auxiliary rolling bearing that rotatably supports a rotating shaft driven by an engine output on a stationary member, and the rolling bearing includes an inner ring and an outer ring. A plurality of rolling elements interposed between the inner ring and the outer ring, and seal members for sealing the grease composition around the rolling elements are provided at both axial opening ends of the inner ring and the outer ring, The grease composition is a grease composition in which an additive is added to a base grease composed of a base oil and a thickener, and the additive is selected from inorganic bismuth and organic bismuth that does not contain a sulfur component. Further, it contains at least one bismuth-based additive, and the blending ratio of the bismuth-based additive is 0.05 to 10 parts by weight with respect to 100 parts by weight of the base grease.

The inorganic bismuth is at least one inorganic bismuth selected from bismuth trioxide, bismuth powder and bismuth carbonate.
The organic bismuth is bismuth organic acid.
The thickener is a urea-based thickener.
The base oil is at least one oil selected from alkyl diphenyl ether oil and poly-α-olefin oil.

  The grease composition enclosed in rolling bearings for automobile electrical equipment and auxiliary equipment is a grease comprising a base oil and a thickener, and at least one bismuth selected from inorganic bismuth and organic bismuth containing no sulfur component. Since the agent is blended, the occurrence of peculiar delamination due to hydrogen embrittlement seen in bearings used in automobiles and industrial machines can be suppressed, and the life of rolling bearings for automobile electrical equipment and auxiliary equipment can be extended.

FIG. 1 shows an example of a rolling bearing for automobile electrical equipment and auxiliary equipment that rotatably supports a rotating shaft that is driven to rotate by engine output on a stationary member. FIG. 1 is a cross-sectional view of a deep groove ball bearing in which a grease composition is enclosed.
In the deep groove ball bearing 1, an inner ring 2 having an inner ring rolling surface 2a on the outer peripheral surface and an outer ring 3 having an outer ring rolling surface 3a on the inner peripheral surface are arranged concentrically, and the inner ring rolling surface 2a and the outer ring rolling surface 3a. A plurality of rolling elements 4 are arranged between the two. Sealers 6 that are fixed to the cage 5, the outer ring 3, and the like that hold the plurality of rolling elements 4 are provided in the axially opposite end openings 8a, 8b of the inner ring 2 and the outer ring 3, respectively. A grease composition 7 is enclosed at least around the rolling element 4.

An example of an automobile electrical equipment / auxiliary machine is shown in FIG. FIG. 2 is a cross-sectional view of the structure of the fan coupling device. The fan coupling device includes an oil chamber 11 in which a viscous fluid such as silicone oil is filled in a case 10 that supports a cooling fan 9 and a stirring chamber 12 in which a drive disk 18 is incorporated. A port 14 is formed in the partition plate 13 provided therebetween, and an end of a spring 15 that opens and closes the port 14 is fixed to the partition plate 13.
A bimetal 16 is attached to the front surface of the case 10, and a piston 17 of a spring 15 is provided on the bimetal 16. The bimetal 16 becomes flat when the temperature of the air that has passed through the radiator is below a set temperature, for example, 60 ° C., the piston 17 presses the spring 15, and the spring 15 closes the port 14. When the air temperature exceeds the set temperature, the bimetal 16 is bent outward as shown in FIG. 2B, the piston 17 releases the pressure of the spring 15, and the spring 15 is elastically deformed. Port 14 is opened.
When the temperature of the air that has passed through the radiator is lower than the set temperature of the bimetal 16 in the operating state of the fan coupling device configured as described above, the port 14 is closed by the spring 15, so that the viscous fluid in the oil chamber 3 is Does not flow into the stirring chamber 12, and the viscous fluid in the stirring chamber 12 is sent into the oil chamber 11 from the circulation hole 19 provided in the partition plate 13 by the rotation of the drive disk 18.
For this reason, the amount of viscous fluid in the stirring chamber 12 becomes small, and the shear resistance due to the rotation of the drive disk 18 becomes small. Therefore, the transmission torque to the case 10 decreases, and the fan 9 rotates at a low speed.

When the temperature of the air that has passed through the radiator exceeds the set temperature of the bimetal 16, the bimetal 16 is bent outward as shown in FIG. 2B, and the piston 17 releases the pressure of the spring 15. At this time, since the spring 15 is elastically deformed in a direction away from the partition plate 13, the port 14 is opened, and the viscous fluid in the oil chamber 11 flows from the port 14 into the stirring chamber 12.
For this reason, the shear resistance of the viscous fluid due to the rotation of the drive disk 18 increases, the rotational torque to the case 10 increases, and the fan 9 supported by the rolling bearing rotates at high speed.
In the fan coupling device, the rotation speed of the fan 9 changes according to the temperature change, so that the warm-up can be accelerated and the cooling water can be prevented from being overcooled, thereby effectively cooling the engine. When the engine temperature is low, the fan 9 is equivalent to being disconnected from the drive shaft 20, and when the engine temperature is high, it is equivalent to being connected. Thus, the rolling bearing 1 is used in a wide temperature range and a wide rotation range from a low temperature to a high temperature.

An example of an alternator for automobile electrical equipment and auxiliary equipment is shown in FIG. FIG. 3 is a sectional view of the structure of the alternator. The alternator includes a pair of frames 21 a and 21 b that form a stationary member housing, and a rotor rotating shaft 23 having a rotor 22 mounted thereon is rotatably supported by a pair of ball bearings 1. A rotor coil 24 is attached to the rotor 22, and a three-turn stator coil 26 is attached to a stator 25 disposed on the outer periphery of the rotor 22 with a phase of 120 °.
The rotor rotating shaft 23 is rotationally driven with a rotational torque transmitted by a belt (not shown) to a pulley 27 attached to the tip thereof. Since the pulley 27 is attached to the rotor rotating shaft 23 in a cantilever state and vibration is also generated as the rotor rotating shaft 23 rotates at high speed, the ball bearing 1 that supports the pulley 27 side in particular receives a severe load. .

FIG. 4 shows an example of an idler pulley used as a belt tensioner for an accessory driving belt of an automobile. FIG. 4 is a sectional view of the structure of the idler pulley.
The pulley includes a pulley body 28 made of a steel plate press and a single row deep groove ball bearing 1 fitted to the inner diameter of the pulley body 28. The pulley main body 28 includes an inner diameter cylindrical portion 28a, a flange portion 28b extending from one end of the inner diameter cylindrical portion 28a to the outer diameter side, an outer diameter cylindrical portion 28c extending in the axial direction from the flange portion 28b, and the other end of the inner diameter cylindrical portion 28a. This is an annulus composed of a flange portion 28d extending to the inner diameter side. The outer ring 3 of the ball bearing 1 is fitted to the inner diameter of the inner cylindrical portion 28a, and a pulley peripheral surface 28e that contacts the belt driven by the engine is provided on the outer diameter of the outer cylindrical portion 28c. By bringing this pulley peripheral surface 28e into contact with the belt, the pulley serves as an idler.

  The ball bearing 1 includes an outer ring 3 fitted to the inner diameter of the inner cylindrical portion 28a of the pulley body 28, an inner ring 2 fitted to a fixed shaft (not shown), and the transfer surfaces 2a, 3a of the inner / outer rings 2, 3. It is comprised of a plurality of incorporated rolling elements 4, a cage 5 that holds the rolling elements 4 at equal circumferential intervals, and a pair of seal members 6 that seal grease. The inner ring 2 and the outer ring 3 are integrally formed. .

  By blending at least one bismuth-based additive selected from inorganic bismuth and organic bismuth that does not contain sulfur components into the grease composition used for the above-mentioned automotive electrical equipment / auxiliaries, it is exposed by frictional wear or wear. The bismuth compound reacts with the newly formed metal surface, and a bismuth compound film is formed on the bearing rolling surface together with iron oxide. The iron oxide and bismuth compound coating formed on the bearing rolling surface can suppress the generation of hydrogen due to the decomposition of the grease and prevent the specific peeling due to hydrogen embrittlement.

Examples of inorganic bismuth that can be used in the grease composition of the present invention include bismuth powder, bismuth carbonate, bismuth chloride, bismuth nitrate and hydrates thereof, bismuth sulfate, bismuth fluoride, bismuth bromide, bismuth iodide, oxyfluoride. Bismuth iodide, bismuth oxychloride, bismuth oxybromide, bismuth oxyiodide, bismuth oxide and its hydrate, bismuth hydroxide, bismuth selenide, bismuth telluride, bismuth phosphate, bismuth oxyperchlorate, bismuth oxysulfate, Examples thereof include sodium bismuth, bismuth titanate, bismuth zirconate, and bismuth molybdate. In the present invention, particularly preferable is bismuth trioxide, which is excellent in heat resistance and resistant to thermal decomposition, and has a high extreme pressure effect. Bismuth powder and bismuth carbonate.
These inorganic bismuths may be added to grease by mixing one or two types.

Examples of the organic bismuth of the present invention include bismuth organic acid and phenyl bismuth, and those containing no sulfur component in the composition can be used. If the sulfur content is included, corrosion progresses and hydrogen penetration into the steel is accelerated, which is not preferable. Among the above organic bismuth, organic acid bismuth having excellent lubricity is preferable.
As the organic acid constituting the bismuth organic acid, any aromatic organic acid, aliphatic organic acid, or alicyclic organic acid can be used.

Specific examples of organic acids include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, heptanoic acid, 2-ethylhexylic acid, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid, tridecylic acid Monovalent saturated fatty acids such as myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, monounsaturated fatty acids such as acrylic acid, crotonic acid, undecylenic acid, oleic acid, gadreic acid, Malonic acid, methylmalonic acid, succinic acid, methylsuccinic acid, dimethylmalonic acid, ethylmalonic acid, glutaric acid, adipic acid, dimethylsuccinic acid, pimelic acid, tetramethylsuccinic acid, suberic acid, azelaic acid, sebacic acid, brassic acid Divalent saturated fatty acids such as fumaric acid, maleic acid, oleic acid, etc. Examples thereof include fatty acid derivatives such as Japanese fatty acid, tartaric acid and citric acid, aromatic organic acids such as benzoic acid, phthalic acid, trimellitic acid and pyromellitic acid, and alicyclic organic acids such as naphthenic acid.
Of these, 2-ethylhexylic acid and naphthenic acid having excellent lubricity and heat resistance are preferably used. These can be used alone or as a mixture.

Base oils that can be used in the present invention include mineral oils such as spindle oil, refrigerating machine oil, turbine oil, machine oil, dynamo oil, highly refined mineral oil, liquid paraffin, GTL oil synthesized by the Fischer-Tropsch process, polybutene, poly- Hydrocarbon synthetic oil such as α-olefin oil, alkylnaphthalene, alicyclic compound, or natural oil, polyol ester oil, phosphate ester oil, polymer ester oil, aromatic ester oil, carbonate ester oil, diester oil, Non-hydrocarbon synthetic oils such as polyglycol oil, silicone oil, polyphenyl ether oil, alkyldiphenyl ether oil, alkylbenzene oil, and fluorinated oil can be used.
Among these, it is preferable to use alkyl diphenyl ether oil and poly-α-olefin oil which are excellent in heat resistance and lubricity.

  Thickeners that can be used in the present invention include benton, silica gel, fluorine compounds, lithium soap, lithium complex soap, strong lucium soap, calcium complex soap, aluminum soap, aluminum complex soap, and other soaps, diurea compounds, polyurea compounds, etc. These urea compounds are mentioned. In consideration of heat resistance, cost, and the like, a urea compound is desirable.

The urea compound is obtained by reacting an isocyanate compound with an amine compound. In order not to leave a reactive free radical, the isocyanate group of the isocyanate compound and the amino group of the amine compound are preferably blended so as to be approximately equivalent.
Base grease for blending various compounding agents by blending a base compound with a base oil can be obtained. The base grease is produced by reacting an isocyanate compound and an amine compound in a base oil.

  A diurea compound is obtained by reaction of a diisocyanate and a monoamine, for example. Examples of the diisocyanate include phenylene diisocyanate, tolylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, hexane diisocyanate, etc., and monoamines include octylamine, dodecylamine, hexadecylamine, stearylamine, Examples include oleylamine, aniline, p-toluidine, cyclohexylamine and the like. The polyurea compound can be obtained, for example, by reacting diisocyanate with a monoamine or diamine. Examples of the diisocyanate and monoamine include those similar to those used for the production of the diurea compound. Examples of the diamine include ethylenediamine, propanediamine, butanediamine, hexanediamine, octanediamine, phenylenediamine, tolylenediamine, xylenediamine, And diaminodiphenylmethane.

  The blending ratio of the thickener to the base grease is 1 to 40 parts by weight, preferably 3 to 25 parts by weight, based on 100 parts by weight of the base grease. If the content of the thickener is less than 1 part by weight, the thickening effect will be reduced, making it difficult to make grease, and if it exceeds 40 parts by weight, the resulting base grease will be too hard and the desired effect will not be obtained. Become.

The blending ratio of at least one bismuth-based additive selected from inorganic bismuth and organic bismuth containing no sulfur component is 0.05 to 10 parts by weight with respect to 100 parts by weight of the base grease. That is, (1) When the bismuth-based additive is only inorganic bismuth, 0.05 to 10 parts by weight of inorganic bismuth with respect to 100 parts by weight of the base grease, and (2) When the bismuth-based additive is only organic bismuth, 0.05 to 10 parts by weight of organic bismuth with respect to 100 parts by weight of grease (3) When the bismuth-based additive is inorganic bismuth and organic bismuth, inorganic bismuth and organic bismuth with respect to 100 parts by weight of base grease Combine 0.05 to 10 parts by weight.
If the blending ratio of the bismuth-based additive is less than the above blending range, peeling on the rolling surface due to hydrogen embrittlement cannot be effectively prevented. If the above range is exceeded, abnormal wear occurs.

  In addition to the bismuth-based additive, a known grease additive may be included as necessary. Examples of the additives include antioxidants such as organic zinc compounds, amines, and phenolic compounds, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, molybdenum disulfide, and graphite. Examples thereof include solid lubricants, metal sulfonates, antirust agents such as polyhydric alcohol esters, friction reducing agents such as organic molybdenum, oily agents such as esters and alcohols, and antiwear agents such as phosphorus compounds. These can be added alone or in combination of two or more.

Examples 1-13
In half of the base oil shown in Table 1, 4,4-diphenylmethane diisocyanate (trade name Millionate MT manufactured by Nippon Polyurethane Industry Co., Ltd., hereinafter referred to as MDI) is dissolved in the proportion shown in Table 1, and the remaining half In this base oil, a monoamine that was twice the equivalent of MDI was dissolved. The respective blending ratios and types are shown in Table 1.
A solution in which monoamine was dissolved was added while stirring the solution in which MDI was dissolved, and then the reaction was continued for 30 minutes at 100 to 120 ° C. to produce a diurea compound in the base oil.
Bismuth-based additives and antioxidants were added to the mixture at the blending ratios shown in Table 1, and the mixture was further stirred at 100 to 120 ° C. for 10 minutes. Thereafter, the mixture was cooled and homogenized with three rolls to obtain a grease composition.

In Table 1, the kinematic viscosity 47 mm ² / sec of Nippon Steel Chemical Co., trade name of Shin fluid 801 in the synthetic hydrocarbon oil is 40 ° C. was used as the base oil, kinematic viscosity alkyl ether oil at 40 ℃ 97 mm ² / Moresco HighLube LB100, a trade name of Matsumura Oil Co., sec. Moreover, the hindered phenol by Sumitomo Chemical Co., Ltd. was used for antioxidant.

  The obtained grease composition was subjected to a rapid acceleration / deceleration test. Test methods and test conditions are shown below. The results are shown in Table 1.

Rapid Acceleration / Deceleration Test A rapid acceleration / deceleration test was performed on a rolling bearing with internal rotation that supports the rotating shaft of an alternator, which is an example of an electrical accessory. The rapid acceleration / deceleration test conditions were set such that the load applied to the pulley attached to the tip of the rotating shaft was 3234 N and the rotation speed was 0 to 18000 rpm. Then, abnormal peeling occurred in the bearing, and the time when the generator stopped when the vibration of the vibration detector exceeded the set value was measured.

Comparative Examples 1-7
By the method according to Example 1, the thickener and base oil were selected at the blending ratios shown in Table 2 to adjust the base grease, and further additives were blended to obtain a grease composition. The obtained grease composition was evaluated by performing the same test as in Example 1. The results are shown in Table 2.

  As shown in Tables 1 and 2, each example is excellent in a rapid acceleration / deceleration test because it can effectively prevent specific peeling accompanied by a white tissue change occurring on the rolling surface. All the rapid acceleration / deceleration tests in each example showed 300 hours or more.

  According to the rolling bearing for automobile electrical equipment and auxiliary equipment of the present invention, the grease composition enclosed in the rolling bearing can effectively prevent specific peeling accompanied with white structure change occurring on the rolling surface of the rolling bearing, and the bearing life can be improved. Since it is excellent, it can be used for automobile electric parts such as electromagnetic clutches for car air conditioners and electric fan motors, rolling bearings for auxiliary machines, and motor bearings.

It is sectional drawing of a deep groove ball bearing. It is sectional drawing of the structure of a fan coupling apparatus. It is sectional drawing of the structure of an alternator. It is sectional drawing of the structure of an idler pulley.

Explanation of symbols

1 Grease-filled bearing (rolling bearing)
2 Inner ring 3 Outer ring 4 Rolling element 5 Cage 6 Seal member 7 Grease composition 8a, 8b Opening 9 Cooling fan 10 Case 11 Oil chamber 12 Stirring chamber 13 Partition plate 14 Port 15 Spring 16 Bimetal 17 Piston 18 Drive disk 19 Distribution Hole 20 Drive shaft 21a, 21b Frame 22 Rotor 23 Rotor rotation shaft 24 Rotor coil 25 Stator 26 Stator coil 27 Pulley 28 Pulley body

Claims (5)

A rolling bearing for automobile electrical equipment and auxiliary equipment that rotatably supports a rotating shaft driven to rotate by engine output on a stationary member, the rolling bearing comprising an inner ring and an outer ring, and a plurality of intermediate rings interposed between the inner ring and the outer ring A rolling element and a seal member for sealing the grease composition around the rolling element are provided at both axial end openings of the inner ring and the outer ring. The grease composition comprises a base oil, a thickener, A grease composition comprising an additive and a base grease consisting of
The additive contains at least one bismuth-based additive selected from inorganic bismuth and organic bismuth not containing a sulfur component, and the blending ratio of the bismuth-based additive is 0.05 to 100 parts by weight of the base grease. Rolling bearings for automobile electrical equipment and auxiliary equipment, characterized by being 10 parts by weight.   2. The rolling bearing for automobile electrical equipment / auxiliary machinery according to claim 1, wherein the inorganic bismuth is at least one inorganic bismuth selected from bismuth trioxide, bismuth powder and bismuth carbonate.   The rolling bearing for automobile electrical equipment / auxiliary equipment according to claim 1, wherein the organic bismuth is bismuth organic acid.   4. A rolling bearing for automobile electrical equipment / auxiliary machinery according to claim 1, wherein the thickener is a urea-based thickener.   2. The rolling bearing for automobile electrical equipment / auxiliary machinery according to claim 1, wherein the base oil is at least one oil selected from alkyl diphenyl ether oil and poly-α-olefin oil.

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