JP2006300211A - Built-in one-way clutch type rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a built-in one-way clutch type rotation transmitting device capable of preventing separation and fretting abrasion on a rolling face of the one-way clutch and rolling faces of inner and outer rings of a rolling bearing, and having superior heat-proof abrasion-proof performances. <P>SOLUTION: In this built-in one-way clutch type rotation transmitting device comprising a minor diameter-side rotating member and a cylindrical major diameter-side rotating member concentrically arranged, the one-way clutch connecting a major diameter face of the minor diameter-side rotating member and a minor diameter face of the major diameter-side rotating member only when the major diameter-side rotating member is rotated at a speed higher than the minor diameter-side rotating member, and the rolling bearing for relatively rotating both rotating members, grease is filled in a clutch internal space provided with a plurality of rollers and a bearing space provided with a plurality of rolling elements, the grease includes a base oil, a thickener and an additive agent, and inorganic bismuth of 0.01 to 15 wt.% is included as the additive agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The one-way clutch built-in type rotation transmission device of the present invention is used by being mounted on, for example, a rotating shaft of an automobile alternator or a driving shaft of a starter motor for starting a traveling engine of an automobile including an idling stop vehicle. The present invention relates to a rotation transmission device with a built-in one-way clutch used for such various applications, and more particularly to a device characterized by a grease composition sealed in the device.

With the widespread use of FF (front engine / front drive) vehicles aimed at miniaturization and weight reduction, and further expansion of living space, automobiles are being forced to reduce their engine rooms. For this reason, electrical equipment accessories for automobiles are further reduced in size and weight, and higher performance and higher output are increasingly required.
As a typical automotive electrical accessory, a fan coupling device that blows air optimally according to the engine temperature and power generated by receiving the rotation of the engine with a belt, supplying power to the vehicle's electrical load and charging the battery There are alternators to be used. These are used to efficiently use the rotational torque of the engine through a one-way clutch that is connected only when the engine is in a predetermined output state. A one-way clutch built-in type rotation transmission device mounted on an electrical accessory for automobiles is frequently loaded and removed because it is frequently attached to and detached from the engine output shaft and the rotation speed when connected to the engine output shaft is high. With increasing performance and output of automobiles such as increased heat and vibration, usage conditions have become stricter.

  On the other hand, when the use conditions of the rotation transmission device with a built-in one-way clutch become severe, the rolling surfaces and inner rings of the balls constituting each rolling bearing at the time of rotation of each rolling bearing, that is, at the time of overrun of the roller clutch, Peeling accompanied by a change in white structure due to hydrogen embrittlement tends to occur on each rolling surface of the outer ring. Further, when each rolling bearing is not rotated, that is, when the roller clutch is locked, fretting wear may easily occur at the contact portion between the rolling surface of each ball and each rolling surface of the inner ring and the outer ring. For this reason, it is desired to use grease that can prevent the occurrence of peeling and fretting wear as the grease sealed in the space where each ball is installed.

  In addition, automotive electrical accessories equipped with a one-way clutch built-in rotation transmission device are often installed in the lower part of the engine room. Is easy to penetrate. When such rainwater or the like enters the space where the balls of each rolling bearing are installed, the rolling surfaces of these balls and the rolling surfaces of the inner and outer rings are likely to corrode. For this reason, it is necessary to use a grease with better rust prevention performance than grease used in other locations as the grease to be sealed in the space where each ball is installed.

Conventionally, in a one-way clutch with a built-in one-way clutch for an alternator, a grease that uses ether oil as a base oil is used (see Patent Document 1), and grease that has a viscosity-pressure coefficient of a predetermined value or more is used. (See Patent Document 2), or those using grease based on synthetic oil having a kinematic viscosity at 40 ° C. of 60 mm ² / s or less (see Patent Document 3).
However, as disclosed in Patent Document 1, the one using ether oil as a base oil has a problem that the low friction wear characteristic when the one-way clutch is in an overrun state is not sufficient. In Patent Document 2, the viscosity pressure coefficient being equal to or greater than a predetermined value is effective for reliably realizing the locked state, but there is a problem that wear in the overrun state cannot be sufficiently suppressed. Further, as in Patent Document 3, when a synthetic oil having a low kinematic viscosity is used as the grease base oil, there is a problem that heat resistance is generally insufficient and long-term use becomes difficult.
JP 11-82688 A JP 2000-234638 A JP 2000-253620 A

  The present invention has been made to cope with such a problem, and can prevent the occurrence of separation and fretting wear on the rolling surface of the roller of the one-way clutch and the rolling surface of the inner and outer rings of the rolling bearing. An object of the present invention is to provide a rotation transmission device with a built-in one-way clutch that has excellent wear resistance.

  The one-way clutch built-in type rotation transmission device of the present invention includes an inner diameter side rotation member, a cylindrical outer diameter side rotation member disposed concentrically with the inner diameter side rotation member, and outer diameter surfaces of these inner diameter side rotation members. The outer diameter surface and the outer diameter of the inner diameter side rotating member are disposed only between the inner diameter surface of the outer diameter side rotating member and the outer diameter side rotating member rotates at a higher speed than the inner diameter side rotating member. A one-way clutch that connects the inner diameter surface of the side rotation member, and a radial load that is placed between the inner diameter side rotation member and the outer diameter side rotation member. A rotation transmission device with a built-in one-way clutch comprising a rolling bearing that allows relative rotation between the two rotating members while installing a plurality of rollers constituting the one-way clutch. In the inner space of the clutch and the above rolling bearing Grease is enclosed in a space where a plurality of rolling elements are formed, and the grease includes a base oil, a thickener, and an additive, and the additive adds inorganic bismuth to the entire grease. It is characterized by containing 0.01 to 15% by weight.

The inorganic bismuth is at least one substance selected from bismuth sulfate, bismuth trioxide, and bismuth.
The base oil is a poly-α-olefin oil (hereinafter referred to as PAO oil) and has a kinematic viscosity at 40 ° C. of 30 to ²⁰⁰ mm ² / s.

(式中、Ｒ₁およびＲ₃ は、炭素原子数 6〜20 の炭化水素基であり、Ｒ₁およびＲ₃ は、同一であっても異なっていてもよい。Ｒ₂ は、炭素原子数 6〜15 の芳香族系炭化水素基である。) The thickener is a urea compound represented by the following formula (1).

(In the formula, R ₁ and R ₃ are hydrocarbon groups having 6 to 20 carbon atoms, and R ₁ and R ₃ may be the same or different. R ₂ has 6 carbon atoms. ˜15 aromatic hydrocarbon groups.)

  The one-way clutch built-in type rotation transmission device of the present invention uses a grease blended with inorganic bismuth having excellent heat resistance and durability for the one-way clutch and the rolling bearing, so that the extreme pressure effect can be maintained for a long time. it can. Therefore, it is possible to prevent the occurrence of separation and fretting wear on the rolling surface of the roller of the one-way clutch and the rolling surface of the inner and outer rings of the rolling bearing, thereby improving the wear resistance and durability of the rotation transmission device with a built-in one-way clutch. Can be maintained for a long time.

  As a result of examining a rotation transmission device with a built-in one-way clutch filled with grease containing extreme pressure agent, a rotation transmission with a built-in one-way clutch filled with grease containing 0.01 to 15 wt% of inorganic bismuth as an additive to the entire grease. It was found that the device had less wear under high load and sliding motion and improved long-term durability compared to a one-way clutch built-in type rotation transmission device containing grease containing additives other than inorganic bismuth. This is presumably because inorganic bismuth has better heat resistance and durability than substances other than inorganic bismuth and is difficult to thermally decompose, so that the extreme pressure effect can be sustained for a long time. The present invention is based on such knowledge.

The one-way clutch built-in type rotation transmission device of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a rotation transmission device with a built-in one-way clutch. This one-way clutch built-in type rotation transmission device includes a pulley 10 (an outer diameter side rotation member) and a sleeve 9 (an inner diameter side rotation member) as a pair of rotation members arranged concentrically with each other. A pair of rolling bearings 1 and 1 and a roller clutch 11 which is a one-way clutch are provided between the inner diameter surface of the pulley 10 and the outer diameter surface of the sleeve 9.
The pulley 10 is formed in a cylindrical shape as a whole, and a part of an annular belt called a poly-V belt can be freely passed over with the cross-sectional shape of the outer diameter surface in the width direction as a waveform. On the other hand, the sleeve 9 is formed in a cylindrical shape as a whole, and is fitted and fixed to a rotating shaft of an auxiliary machine such as an alternator, and is rotatable together with the rotating shaft. The rolling bearings 1 and 1 are installed at positions where the roller clutch 11 is sandwiched from both sides in the axial direction at both ends in the axial direction of the cylindrical space located between the inner diameter surface of the pulley 10 and the outer diameter surface of the sleeve 9. The roller clutch 11 is installed in the middle portion in the axial direction of the cylindrical space.

  The roller clutch 11 freely transmits the rotational force between the pulley 10 and the sleeve 9 only when the pulley 10 is rotated relative to the sleeve 9 in a predetermined direction. The roller clutch 11 includes a clutch inner ring 12, a clutch outer ring 13, a plurality of rollers 14, a clutch retainer 15, and a spring (not shown). Among these, the outer ring for clutch 13 is fitted and fixed to the inner diameter surface of the intermediate portion of the pulley 10 and the inner ring for clutch 12 is fixed to the outer diameter surface of the intermediate portion of the sleeve 9 by interference fitting. Further, the intermediate inner diameter surface of the clutch outer ring 13 is a simple cylindrical surface, and the outer diameter surface of the clutch inner ring 12 is a cam surface 16. That is, a plurality of recesses 17 called ramp portions are provided at equal intervals in the circumferential direction of the outer diameter surface of the clutch inner ring 12, and the outer diameter surface of the clutch inner ring 12 is used as the cam surface 16.

  Also, a plurality of rollers 14 are supported between the intermediate inner diameter surface of the clutch outer ring 13 and the cam surface 16, and each of the rollers 14 is supported corresponding to a slight displacement in the rolling and circumferential directions. A clutch retainer 15 is provided. The clutch retainer 15 is entirely made of synthetic resin, and its inner peripheral edge is engaged with a part of the cam surface 16 to prevent relative rotation with respect to the clutch inner ring 12. At the same time, in the illustrated example, a convex portion 18 formed on the inner diameter surface of the end portion of the clutch retainer 15 is provided between the step surface 19 provided on the outer diameter surface of the sleeve 9 and the axial end surface of the inner ring 12 for clutch. The clutch cage 15 is positioned in the axial direction. Further, a spring (not shown) is provided between each roller 14 and the clutch retainer 15 for pressing each roller 14 in the same direction as the circumferential direction (direction in which each concave portion 17 becomes shallow). Is provided.

  When the above-described roller clutch 11 is configured, the cylindrical surface and the cam surface 16 in contact with the plurality of rollers 14 may be directly formed on the inner diameter surface of the pulley 10 and the outer diameter surface of the sleeve 9, respectively. Further, the arrangement of the cam surface 16 and the cylindrical surface in the radial direction may be reversed from the above-described structure.

  In addition, the pair of rolling bearings 1, 1 allow the sleeve 9 and the pulley 10 to rotate freely while supporting a radial load applied to the pulley 10. As such rolling bearings 1 and 1, in FIG. 1, deep groove type ball bearings are used. That is, each of these rolling bearings 1, 1 has a deep groove type inner ring rolling surface 2 a on the outer diameter surface as shown in detail in FIG. 2, which is a cross-sectional view of a deep groove type ball bearing. The inner ring 2 fitted and fixed to the inner part, the outer ring 3 having a deep groove type outer ring rolling surface 3a on the inner diameter surface and fitted and fixed to both ends of the pulley 10, the inner ring rolling surface 2a and the outer ring rolling surface 3a, and a plurality of balls 4 provided so as to be able to roll while being held by a cage 5. Further, both end openings of the space provided with each ball 4 existing between the outer diameter surface of the inner ring 2 and the inner diameter surface of the outer ring 3 are sealed with seal members 6, respectively. This prevents the grease 7 enclosed in the space in which the balls 4 are provided from leaking to the outside, and prevents foreign matters such as dust from entering the space.

  In the one-way clutch built-in rotation transmission device having the above-described configuration, the sleeve 9 is fitted and fixed to the end of the rotating shaft of an automotive electrical accessory such as an alternator, and the outer diameter surface of the pulley 10 is hung by an annular belt. Passed. This annular belt is stretched over a driving pulley fixed to an end portion of an engine crankshaft or the like, and is driven by the rotation of the driving pulley. The one-way clutch built-in type rotation transmission device assembled in such a state allows the relative rotation between the pulley 10 and the rotating shaft when the traveling speed of the annular belt decreases, and conversely the annular belt. When the traveling speed is constant or increases, the rotational force can be transmitted from the pulley 10 to the rotating shaft. As a result, even when the rotational angular velocity of the crankshaft fluctuates, the pulley 10 and the annular belt are prevented from rubbing, and the life of the annular belt due to the generation of abnormal noise called abrasion and wear is prevented. A decrease in power generation efficiency can be prevented.

  When one of the electric motor and the engine of the automotive electrical accessory is in the operating state and the other is in the stopped state using the one-way clutch built-in rotation transmission device, the pulley 10 It is possible to freely transmit the rotational force to and to prevent the other rotating shaft from rotating. For example, a rotation transmission device with a built-in one-way clutch can be used as an auxiliary device drive device during idling stop of an engine by mounting it on the end of an electric motor of an automotive electrical accessory and a drive shaft of a crankshaft. .

  The inorganic bismuth that can be added to the grease enclosed in the one-way clutch built-in rotation transmission device of the present invention includes bismuth powder, bismuth carbonate, bismuth chloride, bismuth nitrate and hydrates thereof, bismuth sulfate, bismuth fluoride, Bismuth bromide, bismuth iodide, bismuth oxyfluoride, bismuth oxychloride, bismuth oxybromide, bismuth oxyiodide, bismuth oxide and its hydrates, bismuth hydroxide, bismuth selenide, bismuth telluride, bismuth phosphate, oxy Examples thereof include bismuth perchlorate, bismuth oxysulfate, sodium bismuth, bismuth titanate, bismuth zirconate, and bismuth molybdate. Particularly preferred in the present invention are bismuth powder, bismuth sulfate and bismuth trioxide, which are excellent in heat resistance and resistant to thermal decomposition, and thus have a high extreme pressure effect.

  Bismuth is a silver-white metal with the lowest thermal conductivity of all metals except mercury, a specific gravity of 9.8, and a melting point of 271.3 ° C. Bismuth powder is a relatively soft metal and tends to form a film when subjected to extreme pressure. Therefore, the particle size of the powder may be any particle size that can be dispersed in the grease. The bismuth powder used in the grease for a one-way clutch built-in type rotation transmission device of the present invention is preferably 5 to 500 μm.

It is essential to add inorganic bismuth as an extreme pressure agent to the grease for a rotation transmission device with a built-in one-way clutch of the present invention. One kind of inorganic bismuth or a mixture of two or more kinds may be added to the grease.
The amount of inorganic bismuth added is 0.01 to 15% by weight based on the entire grease. Preferably, it is 1 to 10% by weight. If the amount added is less than 0.01% by weight, the effect of improving wear resistance will not be exhibited. If the amount added exceeds 15% by weight, the torque during rotation will increase, heat generation will increase, and rotation trouble will occur. .

  Examples of the base oil that can be used in the grease for the one-way clutch built-in type rotation transmission device of the present invention include mineral oil, PAO oil, ester oil, phenyl ether oil, fluorine oil, and synthetic hydrocarbon synthesized by Fischer-Tropsch reaction. Oil (GTL base oil) and the like. Among these, it is preferable to use at least one selected from PAO oil, mineral oil, ester oil and ether oil. The PAO oil is usually an α-olefin or an isomerized α-olefin oligomer or polymer mixture. Specific examples of the α-olefin include 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1 -Nonadecene, 1-eicocene, 1-docosene, 1-tetracocene and the like can be mentioned, and usually a mixture thereof is used. Moreover, as mineral oil, what is normally used in the field | areas of normal lubricating oil and grease, such as a paraffinic mineral oil and a naphthenic mineral oil, can be used, for example.

The base oil that can be used in the grease for a rotation transmission device with a built-in one-way clutch of the present invention preferably has a kinematic viscosity at 40 ° C. of 30 to 500 mm ² / s. If it is less than 30 mm ² / s, the amount of evaporation increases and the heat resistance decreases, which is not preferable, and if it exceeds 500 mm ² / s, the rotational torque increases, and the rolling surfaces of the clutch rollers and This is not preferable because the temperature rise on the rolling surface of the ball of the rolling bearing becomes large.

式中、Ｒ₁およびＲ₃ は、炭素原子数 6〜20 の炭化水素基であり、Ｒ₁およびＲ₃ は、同一であっても異なっていてもよい。Ｒ₂ は、炭素原子数 6〜15 の芳香族系炭化水素基である。また、Ｒ₁ およびＲ₃ は、炭素原子数 6〜12 の芳香族炭化水素基または炭素原子数 6〜20 の脂環族炭化水素基または炭素原子数 6〜20 の脂肪族炭化水素基であることが好ましい。 Thickeners that can be used in the grease for a one-way clutch built-in type rotation transmission device of the present invention include metal soap thickeners such as aluminum, lithium, sodium, composite lithium, composite calcium, composite aluminum, and the following formula (1) The diurea compound of this is mentioned. Preferably, it is a diurea compound or lithium soap. These thickeners may be used alone or in combination of two or more.

In the formula, R ₁ and R ₃ are hydrocarbon groups having 6 to 20 carbon atoms, and R ₁ and R ₃ may be the same or different. R ₂ is an aromatic hydrocarbon group having 6 to 15 carbon atoms. R ₁ and R ₃ are an aromatic hydrocarbon group having 6 to 12 carbon atoms, an alicyclic hydrocarbon group having 6 to 20 carbon atoms, or an aliphatic hydrocarbon group having 6 to 20 carbon atoms. It is preferable.

The urea compound represented by the formula (1) is obtained, for example, by reaction of diisocyanate and monoamine. Diisocyanates include phenylene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, 2,4-tolylene diisocyanate, 3,3-dimethyl-4,4-biphenylene diisocyanate, octadecane diisocyanate, decane diisocyanate, hexane diisocyanate. Examples of monoamines include octylamine, dodecylamine, hexadecylamine, stearylamine, oleylamine, aniline, p-toluidine, and cyclohexylamine.
A urea compound is obtained by reacting an isocyanate compound and 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 urea 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. In addition to urea compounds, polyurea compounds can also be used.

  The penetration of the one-way clutch built-in rotation transmission device grease that can be used in the present invention is preferably in the range of 200 to 400. If it is less than 200, the lubrication performance at low temperature is deteriorated, and if it exceeds 400, the grease composition tends to leak, which is not preferable.

  The grease for a rotation transmission device with a built-in one-way clutch of the present invention can contain a known additive in the grease as necessary. Examples of the additives include organic zinc compounds, amine-based, phenol-based and sulfur-based antioxidants, metal deactivators such as benzotriazole and sodium nitrite, and viscosity index improvers such as polymethacrylate and polystyrene. Examples thereof include solid lubricants such as molybdenum sulfide and graphite. These can be added alone or in combination of two or more.

In the grease for a rotation transmission device with a built-in one-way clutch according to the present invention, the blending ratio of the additive is preferably 0.01 to 15 parts by weight with respect to 100 parts by weight of the total amount of the base oil and the thickener. The effect is small when the blending ratio of the additive is less than 0.01 parts by weight. If the amount exceeds 15 parts by weight, the heat will increase and the temperature will rise.
The blending ratio of the base oil is preferably 50 to 95 parts by weight with respect to 100 parts by weight of the total amount of the base oil and the thickener. When the blending ratio of the base oil is less than 50 parts by weight, the lubricating oil is small and lubrication is likely to be poor. If it exceeds 95 parts by weight, the grease will tend to soften and leak easily.

Examples 1 to 5
In a reaction vessel, add a thickener to the base oil, homogenize it with a three-roll mill, and use the urea / PAO oil grease (40 ° C base oil viscosity 46 mm ² / s) shown in Table 1 Obtained. Furthermore, inorganic bismuth as an extreme pressure agent and an amine antioxidant (manufactured by Ouchi Shinsei Chemical Co., Ltd., NOCRACK AD-F) as additives are added to the grease in the proportions shown in Table 1, and each Example A grease was prepared. The obtained grease was subjected to the following extreme pressure evaluation test and high-temperature high-speed test. The results are also shown in Table 1.

Comparative Examples 1 to 7
In a reaction vessel, add a thickener to the base oil, homogenize it using a three-roll mill, and use the Li soap / mineral oil grease (40 ° C base oil viscosity 100 mm ² / s) shown in Table 2. A urea / PAO oil-based grease (40 ° C. base oil viscosity 46 mm ² / s) was obtained. Furthermore, inorganic bismuth as an extreme pressure agent and an amine antioxidant (manufactured by Ouchi Shinsei Chemical Co., Ltd., NOCRACK AD-F) as additives are added to the grease in the proportions shown in Table 2, and each comparative example A grease was prepared. The obtained grease was subjected to an extreme pressure evaluation test and a high temperature high speed test in the same manner as in the example. The results are shown in Table 2.

Extreme pressure evaluation test:
An extreme pressure evaluation test apparatus is shown in FIG. The evaluation test apparatus is composed of a φ40 × 10 ring-shaped test piece 21 fixed to the rotating shaft 20, and a ring-shaped test piece 22 in which the end faces are rubbed together at the end face 23. The roller bearing grease was applied to the end face 23 portion, and the extreme pressure property was evaluated by applying the axial load 490 N and the radial load 392 N in the right direction A in FIG. For extreme pressure, the vibration of the rotating shaft 20 caused by increased frictional wear at the sliding parts of both test pieces was measured with a vibration sensor, the test was performed until the vibration value was double the initial value, and the time was measured.
The longer the time it takes for the vibration value of the rotating shaft 20 to be twice the initial value, the greater the extreme pressure effect, and the better the heat resistance and durability. Therefore, the heat resistance durability of the grease was evaluated by comparing each example with each comparative example for the measured length of time.

High temperature high speed test:
Rolling bearings (bearing dimensions: inner diameter φ 20 mm × outer diameter φ 47 mm × width 14 mm) were filled with 1.8 g of the grease obtained in each of the examples and comparative examples, and the outer diameter of the outer ring of the bearing was 150 ° C. Under a radial load of 67 N and an axial load of 67 N, it was rotated at a rotational speed of 10000 rpm, and the time until burning was measured.

In Tables 1 and 2, the urea / PAO oil-based grease and Li soap / mineral oil-based grease data are compared for each example and each comparative example. Zurea / PAO oil-based grease showed heat resistance more than 10 times that of Li soap / mineral oil-based grease.
About the kind of extreme pressure agent, each Example using inorganic bismuth surpassed extreme pressure property compared with the comparative example 3 and the comparative example 5 which used organic bismuth, and showed the outstanding heat-resistant durability.
As shown in Examples 1 to 3, among bismuth powder, bismuth sulfate and bismuth trioxide, bismuth powder showed the best heat resistance and durability.

  The grease for a one-way clutch built-in type rotation transmission device and the one-way clutch built-in type rotation transmission device of the present invention uses inorganic bismuth having excellent heat resistance and durability, so that the extreme pressure effect can be maintained for a long time. . Therefore, it can be suitably used for railway vehicles, construction machines, automobile electrical accessories and the like that are required to have long-term durability in addition to wear resistance.

It is sectional drawing which shows a one-way clutch built-in type rotation transmission apparatus. It is sectional drawing of a rolling bearing. It is a figure which shows an extreme pressure property evaluation test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 2a Inner ring rolling surface 3 Outer ring 3a Outer ring rolling surface 4 Roller 5 Cage 5a Pocket 6 Seal member 6a Elastic material 7 Grease 8 One-way clutch built-in type rotation transmission device 9 Sleeve 10 Pulley 11 Roller clutch 12 Clutch Inner ring for clutch 13 Outer ring for clutch 14 Roller 15 Cage retainer 16 Cam surface 17 Recessed portion 18 Convex portion 19 Step surface 20 Rotating shaft 21 Ring-shaped test piece 22 Ring-shaped test piece 23 End surface

Claims (4)

An inner diameter side rotating member, a cylindrical outer diameter side rotating member arranged concentrically with the inner diameter side rotating member, and an outer diameter surface of the inner diameter side rotating member and an inner diameter surface of the outer diameter side rotating member. A one-way clutch that connects the outer diameter surface of the inner diameter side rotation member and the inner diameter surface of the outer diameter side rotation member only when the outer diameter side rotation member rotates at a higher speed than the inner diameter side rotation member. The one-way clutch is disposed on both sides with respect to the axial direction, and supports the radial load applied between the inner-diameter side rotating member and the outer-diameter side rotating member, and the relative rotation between the two rotating members. A one-way clutch built-in rotation transmission device comprising a rolling bearing that allows
Grease is enclosed in a clutch internal space in which a plurality of rollers constituting the one-way clutch is installed and a space in which a plurality of rolling elements constituting the rolling bearing is installed,
The grease includes a base oil, a thickener, and an additive, and the additive includes 0.01 to 15% by weight of inorganic bismuth with respect to the entire grease. .   The one-way clutch built-in rotation transmission device according to claim 1, wherein the inorganic bismuth is at least one substance selected from bismuth sulfate, bismuth trioxide, and bismuth. The one-way clutch built-in type rotation transmission according to claim 1 or 2, wherein the base oil is a poly-α-olefin oil and has a kinematic viscosity at 40 ° C of 30 to ²⁰⁰ mm ² / s. apparatus. 4. The one-way clutch built-in rotation transmission device according to claim 1, wherein the thickener is a urea compound represented by the following formula (1).

(In the formula, R ₁ and R ₃ are hydrocarbon groups having 6 to 20 carbon atoms, and R ₁ and R ₃ may be the same or different. R ₂ has 6 carbon atoms. ˜15 aromatic hydrocarbon groups.)

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