JP2008202769A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmitting device which is excellent in lubricant holding force and can restrict a movement of the lubricant and supply the lubricant over a long period of time to a member such as roller clutch section or the like which needs the lubricant. <P>SOLUTION: The rotation transmitting device formed by enclosing a porous solid lubricant 11 is characterized in that it relatively and rotatably supports an internal member 3 and external member 5 in such a manner of coaxially arranging, in that it incorporates an engaging element 12 inside a pocket of retainer 10 incorporated between its both members, in that it engages this engaging element 12 with a periphery of the internal member 3 and inner periphery of the external member 5, and in that it transmits rotation torque between the internal member 3 and external member 5. Additionally, the porous solid lubricant 11 is formed by containing lubrication component in resin processed in porous property by foaming and curing, and filled up between the internal member 3 and external member 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation transmission device, for example, a two-way clutch, for switching between driving force transmission and interruption in a driving system path of a vehicle or the like, and more particularly, to a spatial volume including / excluding a frictional engagement surface of an engagement element. The present invention relates to a rotation transmission device enclosing a solid lubricant.

  As a rotation transmission device, a rotation transmission device of a type in which a roller clutch is locked using an electromagnetic clutch as a switch mechanism is known (see Patent Document 1). In this rotation transmission device, when the field is energized, the armature is attracted to the rotor, and the rotational force of the rotor fixed to the rotor guide fixed to the outer ring is transmitted to the armature. A connecting plate is connected to the armature, and the rotation of the armature is transmitted to the cage through the connecting plate, and the cage is rotated relative to the inner ring by bending the switch spring inserted in the cage and the inner ring. The roller held in the pocket of the cage engages with the wedge space formed by the inner diameter of the outer ring and the outer diameter surface of the inner ring, so that torque is transmitted.

However, when grease is sealed in such a rotation transmission device, the parts that require the grease are the roller clutch part and the bearing part. With respect to the bearing, although the grease can be secured in the bearing internal space by the bearing seal, the roller clutch Since the part cannot be completely sealed due to the coupling with the electromagnetic clutch part, etc., the grease enclosed in the roller clutch part flows toward the electromagnetic clutch part during operation and the grease in the roller clutch part decreases. was there. In addition, there is a problem in that the grease is sealed inside more than necessary in order to sufficiently secure the grease in the roller clutch portion, which increases costs.
JP 2003-90356 A

  The present invention has been made in order to cope with such problems, it has excellent lubricant retention, can suppress the movement of the lubricant, in parts that require a lubricant such as a roller clutch portion, An object of the present invention is to provide a rotation transmission device that can supply a lubricant over a long period of time.

  In the rotation transmission device of the present invention, the inner member and the outer member are coaxially arranged and relatively rotatably supported, and the engagement element is incorporated in the pocket of the cage incorporated between the two members. The engaging element is engaged with the outer periphery of the inner member and the inner periphery of the outer member, and rotational torque is transmitted between the inner member and the outer member. A rotation transmission device in which a porous solid lubricant is sealed between the outer members, wherein the porous solid lubricant has a lubricating component and a resin component as essential components, and the resin component is foamed and cured. It is characterized by being a porous solid.

  The engaging element is prevented from rotating with respect to the retainer via a connecting plate and axially moves a rotor attached to the inner member or the outer member with respect to an armature movable in the axial direction. The armature is attracted to the rotor by an electromagnet provided on the fixed member and the phase of the retainer is changed to engage the outer periphery of the inner member and the inner periphery of the outer member. Features.

The porous solid lubricant is characterized by comprising a resin component made of a resin having rubber elasticity or rubber and having a leaching property of the lubricant component due to deformation by an external force.
The resin component is a polyurethane resin.
Moreover, the open cell ratio of the solid is 50% or more.

  Since the rotation transmission device of the present invention is formed by enclosing a porous solid lubricant as a lubricant between the inner member and the outer member, even if centrifugal force or the like occurs, the movement of the lubricant is minimized, It is possible to sufficiently fill a wide space volume with a small amount, and the amount of lubricant used can be reduced as compared with the case of only grease lubrication. In addition, during operation of the rotation transmission device, the lubrication component is gradually released from the porous solid lubricant around the sliding part that requires lubrication due to centrifugal force, etc., enabling stable operation for a long period of time. It is. As a result, compared to conventional grease lubrication, both cost and environmental conservation are superior.

The rotation transmission device of the present invention is a porous solid lubrication having a foam as a lubricant and having a large number of pores in the space volume including / not including the friction engagement surface of the engagement member between the inner member and the outer member. The agent is enclosed. As a result, the lubrication performance can be maintained and a wide space volume can be filled with a small amount, so that the amount of lubricant used can be reduced compared to the case of using only grease lubrication, and the environment is also maintained in terms of cost. Even the entire surface is advantageous.
This porous solid lubricant is a solid material in which a lubricating component and a resin component are essential components, and the resin component is made porous by foaming and curing, and the lubricating component is occluded inside the resin. The lubrication component occluded in the resin component and pores is easily supplied to the lubrication surface due to centrifugal force, temperature rise, capillary action, bending, etc. Surely done. Moreover, since it is a foam and can take a large amount of deformation, a reliable sealing property is ensured by elasticity, but since the foam has a high elastic modulus, it does not lead to an increase in torque due to high contact.
In the present invention, “occlusion” means that a liquid / semi-solid lubricating component does not react with other compounding components and is contained in a solid resin without becoming a compound.

The rotation transmission device of the present invention will be specifically described with reference to the drawings. FIG. 1 is a sectional view showing a rotation transmission device (electromagnetic clutch) as an example of an embodiment of the present invention.
As shown in FIG. 1, in the rotation transmission device, a rotation shaft 2 is inserted into a housing 1, and an inner member 3 is fitted to a shaft end portion of the rotation shaft 2. The rotating shaft 2 and the inner member 3 are coupled by a serration 4. A cylindrical outer member 5 is coaxially provided outside the inner member 3, and the inner member 3 and the outer member 5 are attached by a bearing 6 attached to the cylindrical portion 3 a at one end of the inner member 3. It is supported relatively rotatably. The outer member 5 is rotatably supported by a bearing 7 attached to the inner diameter surface of the housing 1.

  A cage 10 is assembled between the inner member 3 and the outer member 5, and the outer periphery of the inner member 3 is moved into a pocket formed in the cage 10 by relative rotation of the inner member 3 and the cage 10. An engaging element 12 is incorporated which engages with the cam surface 8 formed on the inner surface of the outer member 5 and the cylindrical surface 9 formed on the inner periphery of the outer member 5. A porous solid lubricant 11 is enclosed in a space surrounded by the inner member 3, the outer member 5, and the cage 10.

  As shown in FIGS. 1 and 2, a spring fitting recess 13 is formed on the other end surface of the inner member 3, and a switch spring 14 is incorporated in the spring fitting recess 13. The switch spring 14 has a pair of bent pieces 14 a, and each of the bent pieces 14 a is formed from a window 15 formed on the peripheral wall of the spring fitting recess 13 and a pair of opposed notches 16 formed at the end of the cage 10. Is inserted into one of the two, and the opposite end faces in the circumferential direction of the notch 16 are pressed in opposite directions, and the retainer 10 causes the engagement element 12 to be non-contacted against the cam surface 8 and the cylindrical surface 9 by the pressing. The neutral position of the engagement is maintained.

As shown in FIG. 3, the connecting plate 17 and the armature 18 are sequentially fitted to the cylindrical portion 3 b at the other end of the inner member 3, and the rotor 22 and the electromagnet 19 are opposed to the armature 18 in the axial direction. Has been placed.
The armature 18 is prevented from rotating with respect to the retainer 10 via the connecting plate 17 and is movable in the axial direction.
The electromagnet 19 includes a field core 23 facing the rotor 22 in the axial direction and an electromagnetic coil 24 accommodated in the field core 23.

In the rotation transmission device configured as described above, the cage 10 is held in a neutral position by the switch spring 14 in a state where the energization of the electromagnet 19 to the electromagnetic coil 24 is interrupted, and the engagement element 12 held by the cage 10 is the inner The cam surface 8 of the side member 3 and the cylindrical surface 9 of the outer member 5 are not engaged.
For this reason, the rotation of the inner member 3 that rotates together with the rotating shaft 2 is not transmitted to the outer member 5, and the inner member 3 rotates idle.

  When the electromagnetic coil 24 of the electromagnet 19 is energized, the rotor 22 attracts the armature 18 against the elasticity of the elastic member 30. Due to the suction, the retainer 10 is prevented from rotating by the outer member, and the engagement member 12 is caused to rotate by the relative rotation of the inner member 3 with respect to the retainer 10 and the cylindrical surface 9 of the outer member 5. The rotation of the inner member 3 is transmitted to the outer member 5 via the engagement element 12.

In the present invention, the resin component constituting the porous solid lubricant is preferably a resin component having rubber-like elasticity after foaming and curing, and having a leaching property of the lubricant component due to deformation.
Foaming / curing may be in a form in which foaming / curing is performed at the time of resin production, or in a form in which a foaming agent is added to the resin component and foaming / curing is performed in molding. Here, curing means a cross-linking reaction and / or a phenomenon in which a liquid is solidified. The rubber-like elasticity means rubber elasticity and means that deformation applied by an external force returns to the original shape by eliminating the external force.

In the present invention, examples of the resin component include rubber and resin.
Examples of the rubber include various rubbers such as natural rubber, butadiene rubber, styrene butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, silicone rubber, urethane elastomer, fluorine rubber, and chlorosulfone rubber.
Examples of the resin include general-purpose plastics such as polyurethane resin, polyethylene resin, polypropylene resin, polystyrene resin, polyvinyl chloride resin, polyacetal resin, polyamide 4,6 resin, polyamide 6,6 resin, polyamide 6T resin, and polyamide 9T resin. Engineering plastics.
Among the above resins, a polyurethane resin that is easily foamed and cured to be porous is preferable.

  The polyurethane resin that can be used in the present invention is a foamed / cured product obtained by a reaction between an isocyanate and a polyol, and is preferably a foamed / cured product of a urethane prepolymer having an isocyanate group (—NCO) in the molecule. This isocyanate group may be blocked by other substituents. The isocyanate group contained in the molecule may be at the end of the molecular chain or may be contained at the end of the side chain branched from the molecular chain. The urethane prepolymer may have a urethane bond in the molecular chain.

The urethane prepolymer can be obtained by reacting a compound having an active hydrogen group with a polyisocyanate.
Examples of the compound having an active hydrogen group include low molecular polyols, polyether polyols, polyester polyols, and castor oil polyols. These can be used alone or as a mixture of two or more. Examples of the low molecular polyol include divalent ones such as ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, hydrogenated bisphenol A, etc. (3- to 8-valent ones) For example, glycerin, trimethylolpropane, hexanetriol, pentaerythritol, sorbitol, shoelace and the like.

  Examples of the polyether polyol include alkylene oxide (alkylene oxide having 2 to 4 carbon atoms, for example, ethylene oxide, propylene oxide, butylene oxide) adducts of the above low molecular polyols and ring-opening polymers of alkylene oxides. Includes polyethylene glycol, polypropylene glycol, and polytetramethylene ether glycol.

Examples of polyester polyols include polyester polyols, polycaprolactone polyols, and polyether ester polyols. Polyester polyols are carboxylic acids (aliphatic saturated or unsaturated carboxylic acids such as adipic acid, azelaic acid, dodecanoic acid, maleic acid, fumaric acid, itaconic acid, dimerized linoleic acid and / or aromatic carboxylic acids such as phthalic acid. , Isophthalic acid) and a polyol (the above low molecular polyol and / or polyether polyol).
Polycaprolactone polyol is a polymerization initiator for glycols and triols such as ε-caprolactone, α-methyl-ε-caprolactone, ε-methyl-ε-caprolactone, etc. as organometallic compounds, metal chelate compounds, fatty acid metal acylates, etc. Obtained by addition polymerization in the presence of a catalyst. The polyether ester polyol can be obtained by addition reaction of a polyester having a carboxyl group and / or a hydroxyl group at the terminal with an alkylene oxide such as ethylene oxide or propylene oxide. As the castor oil-based polyol, castor oil and castor oil or castor oil fatty acid and the above low molecular polyol, polyether polyol, and polyester polyol are transesterified or esterified polyol.

Polyisocyanates include aromatic diisocyanates, aliphatic or alicyclic and polyisocyanate compounds.
Aromatic diisocyanates include, for example, diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate and mixtures thereof, 1,5-naphthylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate Is mentioned.
Aliphatic or alicyclic diisocyanates include, for example, 1,6-hexamethylene diisocyanate, 1,12-dodecane diisocyanate, 1,3-cyclobutane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isopropane diisocyanate. 2,4-hexahydrotoluylene diisocyanate, 2,6-hexahydrotoluylene diisocyanate, 1,3-hexahydrophenyl diisocyanate, 1,4-hexahydrophenyl diisocyanate, 2,4′perhydrodiphenylmethane diisocyanate, 4, 4'-perhydrodiphenylmethane diisocyanate is mentioned.
Examples of the polyisocyanate compound include 4,4 ′, 4 ″ -triphenylmethane triisocyanate, 4,6,4′-diphenyl triisocyanate, 2,4,4′-diphenyl ether triisocyanate, and polymethylene polyphenyl polyisocyanate. It is done.
Moreover, what modified | denatured some of these isocyanate to biuret, allophanate, carbodiimide, oxazolidone, amide, imide, etc. is mentioned.

Examples of the urethane prepolymer suitable for the present invention include polypolymer ester polyol and prepolymer obtained by addition polymerization of polyisocyanate to polyether polyol, which are known as casting urethane prepolymers.
The polylactone ester polyol is preferably a urethane prepolymer obtained by addition polymerization of a polyisocyanate in the presence of a short-chain polyol to a polylactone ester polyol obtained by ring-opening reaction of caprolactone.
Examples of the polyether polyol include alkylene oxide addition products or ring-opening polymerization products, and urethane prepolymers obtained by addition polymerization of these with polyisocyanates are preferable.

  If the commercial item of the urethane prepolymer which can be used conveniently for this invention is illustrated, the brand name Plaxel EP by Daicel Chemical Industries may be mentioned. Plaxel EP is a white solid urethane prepolymer having a melting point above room temperature. As an example of polyether polyol, trade name Preminol manufactured by Asahi Glass Co., Ltd. may be mentioned. Preminol is a polyether polyol having a molecular weight of 5000-12000.

  Curing agents for curing the urethane prepolymer include 3,3′-dichloro-4,4′-diaminodiphenylmethane (hereinafter referred to as MOCA) and 4,4′-diamino-3,3′-diethyl-5. 5'-dimethyldiphenylmethane, trimethylene-bis- (4-aminobenzoate), bis (methylthio) -2,4-toluenediamine, bis (methylthio) -2,6-toluenediamine, methylthiotoluenediamine, 3,5- Aromatic polyamines typified by diethyltoluene-2,4-diamine, 3,5-diethyltoluene-2,6-diamine, the above polyisocyanates, low molecular polyols typified by 1,4-butane glycol and trimethylolpropane , Polyether polyol, castor oil-based polyol, polyester-based polyol, hydroxyl-terminated liquid polybutadiene A liquid rubber having two or more hydroxyl groups represented by hydroxyl group-terminated liquid polyisoprene, hydroxyl-terminated polyolefin-based polyols, and compounds in which the terminal hydroxyl groups of these compounds are modified with an isocyanate group or an epoxy group. Can be used. Among these, an aromatic polyamine which can achieve both foamability and rubbery elasticity and is easily available industrially is preferable for curing a urethane prepolymer obtained by addition polymerization of polylactone ester polyol and polyisocyanate.

  As a means for foaming the resin component, a well-known foaming means may be employed. For example, a chemical foaming method that generates a volatile gas by a chemical reaction, an organic solvent having a relatively low boiling point such as water, acetone, hexane, or the like. Heat treatment such as physical methods for heating and vaporization, mechanical foaming method in which an inert gas such as nitrogen or air is blown from the outside, azobisisobutyronitrile (AIBN), azodicarbonamide (ADCA), etc. Examples include a method of using a decomposable foaming agent that is chemically decomposed by light irradiation to generate nitrogen gas or the like.

  Since the urethane prepolymer used in the present invention has an isocyanate group in the molecule, it is preferable to use a chemical foaming method using carbon dioxide generated by a chemical reaction between the isocyanate group and the water molecule using water as a foaming agent. This method is preferable because open cells are easily generated.

Moreover, when using the chemical foaming method with such a reaction, it is preferable to use a catalyst as needed, for example, a tertiary amine catalyst or an organometallic catalyst is used. Examples of the tertiary amine catalyst include monoamines, diamines, triamines, cyclic amines, alcohol amines, ether amines, imidazole derivatives, and acid block amine catalysts.
Examples of organometallic catalysts include stanaoctate, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin mercaptide, dibutyltin thiocarboxylate, dibutyltin maleate, dioctyltin dimercaptide, dioctyltin thiocarboxylate, octenoate, etc. Is mentioned. Moreover, you may mix and use these multiple types for the purpose of adjusting the balance of reaction.

  Without being limited to the above resin components, various adhesives such as urethane adhesives, cyanoacrylate adhesives, epoxy adhesives, polyvinyl acetate adhesives, polyimide adhesives can be used by foaming and curing. .

  In the present invention, various additives can be used in the resin component as necessary. Additives include antioxidants typified by hindered phenols, reinforcing agents (carbon black, white carbon, colloidal silica, etc.), inorganic fillers (calcium carbonate, barium sulfate, talc, clay, meteorite powder, etc.) Examples include anti-aging agents, flame retardants, metal deactivators, antistatic agents, antifungal agents, fillers, and coloring agents.

The lubricating component that can be used in the present invention can be used without any choice as long as it does not dissolve the resin component that forms the foam. As the lubricating component, for example, lubricating oil, grease, wax and the like can be used alone or in combination.
Examples of the lubricating oil include paraffinic and naphthenic mineral oils, ester synthetic oils, ether synthetic oils, hydrocarbon synthetic oils, GTL base oils, fluorine oils, and silicone oils. These can be used alone or as a mixed oil.
If the resin material and the lubricating oil do not dissolve or disperse due to chemical compatibility such as polarity, it is easier to physically mix and prevent segregation of the lubricant by using a lubricating oil with close viscosity. It becomes.

  The grease is obtained by adding a thickener to a base oil, and examples of the base oil include the above-described lubricating oil. Thickeners include, but are not limited to, soaps such as lithium soap, lithium complex soap, calcium soap, calcium complex soap, aluminum soap, aluminum complex soap, and urea-based compounds such as diurea compounds and polyurea compounds. It is not a thing.

The diurea compound is obtained, for example, by reaction of diisocyanate and monoamine. Examples of the diisocyanate include phenylene diisocyanate, diphenyl diisocyanate, phenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, and hexane diisocyanate.
Examples of the monoamine include octylamine, dodecylamine, hexadecylamine, octadecylamine, oleylamine, aniline, p-toluidine, cyclohexylamine and the like.

  The polyurea compound is obtained, for example, by reacting diisocyanate with monoamine and 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, and xylenediamine. Is mentioned.

  The blending ratio of the base oil in the grease is 1 to 98% by weight, preferably 5 to 95% by weight, based on the whole grease component. If the base oil is less than 1% by weight, it will be difficult to sufficiently supply the lubricating oil to the necessary locations. On the other hand, when it is more than 98% by weight, it does not solidify even at low temperatures and remains liquid.

  Examples of waxes used in the present invention include hydrocarbon synthetic waxes, polyethylene waxes, fatty acid ester waxes, fatty acid amide waxes, ketones / amines, hydrogenated oils, and the like. As oil components that may be used by mixing oil with these waxes, the same oil components as those described above can be used.

  The lubricating components described above further include solid lubricants such as molybdenum disulfide and graphite, friction modifiers such as organic molybdenum, oily agents such as amines, fatty acids, and fats, antioxidants such as amines and phenols, Rust inhibitors such as petroleum sulfonate, dinonylnaphthalene sulfonate, sorbitan ester, extreme pressure agents such as sulfur and sulfur-phosphorus, organic zinc, phosphorus and other antiwear agents, metals such as benzotriazole and sodium nitrite Various additives such as viscosity index improvers such as an inert agent, polymethacrylate, and polystyrene may be included.

The porous solid lubricant used in the present invention is obtained as a solid material which is made porous by foaming and curing a mixture in which a lubricating component and a resin component are essential components and a curing agent and a foaming agent are blended therein.
The blending ratio of the lubricating component is 1 to 90% by weight, preferably 5 to 80% by weight, based on the entire mixture. When the lubricating component is less than 1% by weight, the supply amount of the lubricating component is so small that it cannot function as a solid lubricant, and when it exceeds 90% by weight, it does not solidify.
The blending ratio of the resin is 8 to 98% by weight, preferably 20 to 80% by weight, based on the entire mixture. When it is less than 8% by weight, it does not solidify, and when it is more than 98% by weight, the supply amount of the lubricating component is so small that it cannot function as a solid lubricant.

  The blending ratio of the curing agent is determined depending on the blending ratio of the resin and the foaming ratio, and the blending ratio of the foaming agent is determined in relation to the foaming ratio described later.

The method of mixing the mixture containing the lubricating component and the resin component as essential components is not particularly limited. For example, mixing is performed using a commonly used stirrer such as a Henschel mixer, a ribbon mixer, a juicer mixer, a mixing head, or the like. Can do.
The mixture preferably uses a surfactant such as a commercially available silicone foam stabilizer, and each raw material molecule is preferably dispersed uniformly. Further, the surface tension can be controlled by the type of the foam stabilizer, and the type of the generated bubbles can be controlled to open cells or closed cells. Examples of such surfactants include anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, silicone surfactants, and fluorine surfactants.

The porous solid lubricant used in the rotation transmission device of the present invention has a lubricating component and a resin component as essential components, and supplies lubricating oil to the outside by external forces such as compression, bending, centrifugal force, and expansion of bubbles accompanying a temperature rise. Is possible.
In order to occlude the lubricating component inside the resin, it is desirable to employ a reactive impregnation method in which a foaming reaction and a curing reaction are simultaneously performed in the presence of the lubricating component. In this way, it is possible to highly fill the inside of the resin with the lubricant, and thereafter, the post-impregnation step of impregnating and replenishing the lubricant can be omitted.
On the other hand, a foam solid body is molded in advance, and only a post-impregnation method in which the solid is impregnated with a lubricant does not allow a sufficient amount of liquid lubricant to penetrate into the resin. If the lubricating oil is released in a short time and used for a long time, the lubricating oil may be insufficiently supplied. For this reason, the post-impregnation step is preferably employed as an auxiliary means for the reactive impregnation method.

  It is preferable that the bubbles to be generated when foamed by foaming at the time of foaming / curing are open cells that communicate with each other, and the lubricating component can be directly removed from the surface of the resin via the open cells by external stress. This is to supply. In the case of closed cells where the bubbles do not communicate with each other, the entire amount of lubricating oil in the solid component is temporarily isolated in the closed cells, making it difficult to move between the bubbles. May not be.

  In the present invention, the open cell ratio of the porous solid lubricant is preferably 50% or more, more preferably 70% or more. When the open cell ratio is less than 50%, the ratio of the lubricating oil in the resin component temporarily taken up into the closed cells increases and may not be supplied to the outside when necessary.

The open cell ratio of the porous solid lubricant used in the present invention can be calculated by the following procedure.
(1) The foam solidified porous solid lubricant is cut into an appropriate size to obtain sample A. The weight of sample A is measured.
(2) A is soxhlet washed (solvent: petroleum benzine) for 3 hours. Thereafter, the sample is left in a thermostatic bath at 80 ° C. for 2 hours to completely dry the organic solvent, and sample B is obtained. The weight of sample B is measured.
(3) The open cell ratio is calculated by the following procedure.
Open cell ratio = (1− (weight of resin component of sample B−weight of resin component of sample A) / weight of lubricating component of sample A) × 100
The resin component weight and the lubrication component weight of Samples A and B are calculated by multiplying the weights of Samples A and B by the composition charge ratio.
Lubricating components taken into discontinuous closed cells are not released to the outside by Soxhlet cleaning for 3 hours, so the weight of sample B is not reduced. The open cell ratio can be calculated as a result of the release of the lubricating component.

  The expansion ratio of the porous solid lubricant used in the present invention is preferably 1.1 to 100 times. More preferably, it is 1.1 to 10 times. This is because when the foaming ratio is less than 1.1 times, the bubble volume is small, and deformation is not allowed when external stress is applied, or the solid matter is too hard and cannot be deformed following external stress. If it exceeds 100 times, it will be difficult to obtain the strength to withstand external stress, which may lead to damage or destruction.

A porous solid lubricant may be foamed and cured after pouring a mixture containing a lubricating component and a resin component into a rotation transmission device. It can be post-processed and incorporated into the rotation transmission device.
In the present invention, it is possible to easily fill any part in the rotation transmission device having a complicated shape, and there is no need for a molding die or a grinding step for obtaining a foamed molded product. It is preferable to adopt a method of pouring the foam into a rotation transmission device before foaming / curing and foaming / curing in the device. By adopting this method, the manufacturing process is simplified and the cost can be reduced.

Example 1
Silicone foam stabilizers and urea grease were added to the urethane prepolymer in the amount (composition) shown in Table 1, and the mixture was well stirred at 120 ° C. An amine-based curing agent was added and stirred, and water as a foaming agent was added. The liquid material before curing / foaming was poured into the internal space of the two-way clutch, and left in a thermostat set at 120 ° C for 1 hour to foam / cure to obtain a rotation transmission device enclosing a porous solid lubricant. . Further, the open cell ratio of the foamed lubricant was measured based on the above-described method for calculating the open cell ratio. The results are also shown in Table 1.

Example 2 and Example 3
In the composition shown in Table 1, silicone-based foam stabilizer, lubricating oil, amine-based catalyst, and water as a blowing agent were added to polyether polyol, and the mixture was heated at 90 ° C. and stirred well. The isocyanate was added to this and stirred well. The liquid material before curing / foaming was poured into the internal space of the two-way clutch and allowed to cure in a thermostat set at 90 ° C for 15 minutes to obtain a rotation transmission device enclosing a porous solid lubricant. Further, the open cell ratio of the foamed lubricant was measured in the same manner as in Example 1. The results are also shown in Table 1.

  The rotation transmission device of the present invention is excellent in the lubricant holding force, can suppress the movement of the lubricant, and can supply the lubricant to a site requiring the lubricant such as a roller clutch portion over a long period of time. It can be suitably used as a rotation transmission device for various industrial machines such as a machine, an electric device, a printing machine, an automobile part, an electrical accessory, and a construction machine, particularly as an electromagnetic clutch for an automobile.

It is sectional drawing which shows the rotation transmission apparatus which is an example of embodiment of this invention. It is sectional drawing along the III-III line of FIG. It is sectional drawing which expands and shows the electromagnet and armature part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Rotating shaft 3 Inner member 4 Serration 5 Outer member 6 Bearing 7 Bearing 8 Cam surface 9 Cylindrical surface 10 Cage 11 Porous solid lubricant 12 Engagement element 13 Spring fitting recessed part 14 Switch spring 15 Window 16 Notch 17 connecting plate 18 armature 19 electromagnet 22 rotor 23 field core 24 electromagnetic coil 30 elastic member

Claims (5)

An inner member and an outer member are coaxially arranged and relatively rotatably supported, and an engagement element is incorporated into a pocket of a cage assembled between the two members, and the engagement element is inserted into the inner direction. It is engaged with the outer periphery of the member and the inner periphery of the outer member to transmit rotational torque between the inner member and the outer member, and is porous between the inner member and the outer member. A rotation transmission device enclosing a solid lubricant,
The rotation transmission device according to claim 1, wherein the porous solid lubricant is a solid material in which a lubricating component and a resin component are essential components, and the resin component is made porous by foaming and curing.   The engagement element is prevented from rotating with respect to the retainer via a connecting plate, and an axially movable rotor attached to the inner member or the outer member is axially moved with respect to an armature that is movable in the axial direction. The armature is attracted to the rotor by an electromagnet provided on the fixed member and the phase of the cage is changed to engage the outer periphery of the inner member and the inner periphery of the outer member. The rotation transmission device according to claim 1.   3. The rotation according to claim 1, wherein the porous solid lubricant has a resin component made of a rubber-like elastic resin or rubber, and has a leaching property of the lubricating component due to deformation by an external force. Transmission device.   The rotation transmission device according to claim 1, wherein the resin component is a polyurethane resin.   The rotation transmission device according to any one of claims 1 to 4, wherein an open cell ratio of the solid is 50% or more.

Images