JP4749843B2 - Tooth surface measurement method for toothed belt - Google Patents

Description

  The present invention relates to a method for controlling the friction coefficient of a toothed belt tooth surface by accurately measuring the surface state of the toothed belt tooth surface, and reducing the meshing interference with the pulley, and particularly in office equipment and the like. The present invention relates to a method for controlling the friction coefficient of the toothed surface of a urethane toothed belt to be used, reducing the sound generation and improving the meshing with the pulley, and reducing the printing unevenness in the printer.

In a toothed belt, the belt is rotated around a toothed pulley, and a phenomenon in which the belt generates a sound due to interference between the belt and the pulley is generally known. There are various theories about the detailed examination of this sound generation phenomenon, and as one of them, the sound becomes more pronounced when the frictional force between the belt tooth surface and the pulley is large.

Therefore, in order to control the friction coefficient of the belt tooth surface, it is necessary to quantitatively grasp the friction coefficient of the belt tooth surface. Therefore, the tooth of the toothed belt is placed on a plate made of such a material, such as a resin such as tetrafluoropolyethylene, or a metal such as iron or aluminum, as the material of the pulley with which the belt teeth come into contact. A toothed belt is installed so that the surface abuts, a weight of a predetermined load is placed on the back of the toothed belt, the toothed belt is pulled at a predetermined speed, and the tooth surface of the belt is determined from the relationship between the toothed belt tension and the load. The coefficient of friction was calculated.

However, with this method, if the mating material is a material that tends to increase the frictional force of the belt, stick slip is likely to occur when the toothed belt is pulled, and the belt pulling force does not show a constant value, resulting in a measurement error. Was getting bigger. On the other hand, if the mating material is a material that tends to reduce the frictional force of the belt, the friction coefficient of the belt becomes extremely small, and it is difficult to specify the difference with a low friction coefficient regardless of the material of the belt. It was very difficult.

Conventionally, as to the method for producing a polyurethane elastomer molded product having a reduced friction coefficient only on the surface, as described in Japanese Patent No. 2998106, a polyurethane elastomer molded product is prepared by centrifugal molding, and the molding material is rotated. After being injected into the molding drum, a silicone oil having a terminal hydroxyl group is added to the surface of the molding material in the initial stage of curing of the molding material, and a thin layer of polyurethane elastomer having a siloxane bond is formed on the surface of the polyurethane elastomer, While maintaining the inherent properties of polyurethane elastomers, the coefficient of friction could be reduced. (For example, patent document 1).

Patent No. 0998106

  In the polyurethane molded product described in Patent Document 1, in order to release the polyurethane molded product from the mold, it is necessary to first apply a release agent to the mold, and the molding material and the silicone oil are added separately. It was necessary and time-consuming. Furthermore, in the method described in Patent Document 1, centrifugal molding has to be adopted, and equipment such as a large motor for centrifugal molding has been required. Further, when the mold is detached from the centrifugal molding machine for molding at a high rotation speed, it becomes dangerous and there is a problem in safety. Furthermore, it has been difficult to reduce the coefficient of friction on any one or both sides.

  Further, when a friction coefficient reducing agent is added in advance during the blending of the polyurethane molded product, it is dispersed throughout the polyurethane blend, resulting in a decrease in hardness and physical properties.

  Therefore, it was possible to provide a polyurethane belt that can be molded in a stationary state without the need to rotate a mold and that can reduce the surface friction coefficient of one of the belts, and a method for manufacturing the same. (For example, patent document 2).

Japanese Patent Application No. 2003-406922

However, although a polyurethane belt capable of reducing the friction coefficient of the belt tooth surface and a manufacturing method thereof could be provided, the surface condition of the tooth surface could not be measured by a reliable method.

As a conventional measurement method, a resin such as tetrafluoropolyethylene or a metal such as iron or aluminum, which is a material of the pulley with which the belt teeth come into contact, is used as a counterpart material. Install the toothed belt so that the toothed surface of the toothed belt comes into contact, place the weight of the specified load on the back of the toothed belt, pull the toothed belt at the specified speed, and the relationship between the toothed belt tension and load From the above, the friction coefficient of the belt tooth surface was calculated.

However, with this method, if the mating material is a material that tends to increase the frictional force of the belt, stick slip is likely to occur when the toothed belt is pulled, and the belt pulling force does not show a constant value, resulting in a measurement error. Was getting bigger. On the other hand, when the mating material is a material that can easily reduce the frictional force of the belt, the friction coefficient of the belt becomes extremely small, and any belt of any material does not cause a difference with a low friction coefficient, so the material can be selected. I could not.

  The present invention ameliorates such problems, and there is little error in the measured coefficient of friction, the coefficient of friction is constant, and a toothed belt that can detect a significant difference depending on the material and surface condition of the toothed belt tooth surface. An object of the present invention is to provide a method for measuring the surface condition of a tooth surface.

  The present invention has a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded, and teeth having tooth portions and tooth grooves alternately arranged at equal pitches in the belt length direction. A method for measuring the surface state of a belt tooth surface with a belt, wherein the belt teeth of the same belt face each other and the tooth portions are fitted into the tooth grooves facing each other, so that the friction coefficient of the belt tooth surface in an overlapped state. In the method for measuring the surface state of the toothed belt tooth surface.

  The invention according to claim 2 has a plurality of tooth portions arranged along the length direction and a back portion in which the core wire is embedded, and the tooth portions and the tooth grooves are alternately arranged at equal pitches in the belt length direction. This is a method for measuring the surface condition of the toothed belt tooth surfaces provided side by side, and as a counterpart material for measuring the surface condition of the toothed belt tooth surfaces, a tooth groove having substantially the same shape as the belt teeth is engraved on the plate. The belt teeth are fitted into the tooth gaps of the plate-like object, the tooth portions are moved along the tooth gaps, and the tensile force in the moving direction is measured, whereby the friction from the frictional force of the belt tooth surfaces is measured. It is in the surface state measuring method of the toothed belt tooth surface for calculating the coefficient.

  The invention according to claim 3 is the surface condition measurement of the tooth belt surface of the toothed belt according to claim 1 or 2, wherein the friction force is a friction force between tooth pressure surfaces extending in the tooth width direction of the toothed belt. Is the method.

  According to a fourth aspect of the present invention, the toothed belt is a helical toothed belt formed such that a direction in which the belt teeth extend forms a predetermined angle with respect to the belt width direction. It is the surface state measuring method of a toothed belt tooth surface as described in above.

  The invention according to claim 5 is the method for measuring the surface condition of a toothed belt tooth surface according to any one of claims 1 to 4, wherein the material of the toothed belt is polyurethane elastomer.

  The invention according to claim 6 is the method for measuring the surface condition of a toothed belt tooth surface according to claims 2 to 5, wherein the plate-like material is made of the same composition as the elastomer constituting the toothed belt.

  The invention according to claim 7 has a plurality of tooth portions arranged along the length direction and a back portion in which the core wire is embedded, and the tooth portions and the tooth grooves are alternately arranged at equal pitches in the belt length direction. A toothed belt provided side by side, in which a polyurethane layer having a siloxane bond is formed on a tooth surface of a urethane belt using a polyurethane elastomer as a base material and a urethane elastic body embedded with a tensile body Surface condition measuring method, wherein the tooth teeth of the same belt are opposed to each other, the tooth portions are fitted in the opposed tooth grooves, the tooth portions are moved along the tooth grooves, and the tensile force in the moving direction is measured. This is a method for measuring the surface condition of a toothed belt tooth surface made of urethane, in which the coefficient of friction is calculated from the friction force of the belt tooth surface in a superposed state.

  The invention according to claim 8 has a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded, and the tooth portions and the tooth grooves are alternately arranged at equal pitches in the belt length direction. A toothed belt provided side by side, in which a polyurethane layer having a siloxane bond is formed on a tooth surface of a urethane belt using a polyurethane elastomer as a base material and a urethane elastic body embedded with a tensile body As a counterpart material for measuring the surface state of a toothed belt tooth surface, a tooth-like groove having substantially the same shape as a belt tooth is formed in a plate-like body, and the belt tooth is formed on the plate-like body. A toothed belt tooth surface made of urethane that calculates the coefficient of friction from the friction force of the belt tooth surface by measuring the tensile force in the moving direction by moving the tooth portion along the tooth groove and This is a surface state measurement method.

  The invention according to claim 9 is the surface of the tooth surface of the toothed belt made of urethane according to claim 1 or 2, wherein the friction force is a friction force between tooth pressure surfaces extending in the tooth width direction of the toothed belt. It is a state measurement method.

  The invention according to claim 10 is the helical toothed belt, wherein the toothed belt is formed such that a direction in which the belt teeth extend forms a predetermined angle with respect to the belt width direction. It is the surface state measuring method of a toothed belt tooth surface as described in above.

  The invention according to claim 11 is the method for measuring the surface condition of a toothed belt tooth surface according to claims 2 to 4, wherein the plate-like material is made of the same composition as the polyurethane elastomer constituting the toothed belt.

  According to the present invention, it has a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded, and the tooth portions and the tooth grooves are alternately arranged at equal pitches in the belt length direction. It is a method for measuring the surface state of a toothed belt tooth surface, the belt teeth of the same belt are opposed to each other, the tooth portions are fitted into the opposed tooth grooves, and the tooth portions are moved along the tooth grooves, This is a method for measuring the surface state of a toothed belt tooth surface by calculating the friction coefficient from the friction force of the belt tooth surface in a superposed state by measuring the tensile force in the moving direction, so that there is less deformation of the belt tooth tip. As a result, stick slip is less likely to occur during the measurement of the friction force, and there is an effect that reliable friction coefficient data can be obtained without any measurement error.

  According to invention of Claim 2, it has a several tooth part arrange | positioned along a length direction, and the back part which embed | buried the core wire, and a tooth part and a tooth space are alternated at equal pitches in a belt length direction. The tooth surface of the toothed belt tooth surface provided side by side is a method for measuring the surface state of the toothed belt tooth surface, as a counterpart material for measuring the surface state of the toothed belt tooth surface, a tooth groove having substantially the same shape as the belt teeth. By engraving, fitting the belt teeth into the tooth gap of the plate-like object, moving the tooth portion along the tooth gap, and measuring the tensile force in the moving direction, from the frictional force of the belt tooth surface Since this is a method for measuring the surface condition of a toothed belt tooth surface that calculates the friction coefficient, deformation of the belt tooth tip is reduced, stick slip is less likely to occur during friction force measurement, and there is no measurement error and reliable friction. Coefficient data can be obtained and the counterpart material is always the same. Ri, the surface state of the belt teeth may be relatively evaluated.

  According to a third aspect of the invention, the frictional force is a frictional force between tooth pressure surfaces extending in the tooth width direction of the toothed belt. Therefore, since no pressure is applied to the tooth tip surface, there is an effect that the tooth tip is not deformed and stick slip does not occur and more reliable friction coefficient data can be obtained.

  According to the invention described in claim 4, the tooth according to claim 1, wherein the toothed belt is a helical toothed belt formed such that the extending direction of the belt teeth forms a predetermined angle with respect to the belt width direction. Since this is a method for measuring the surface state of a toothed belt tooth surface, it is particularly effective for a helical toothed belt that easily interferes with a pulley flange.

  According to invention of Claim 5, since the material of the said toothed belt is a polyurethane elastomer, since it is the surface state measuring method of the toothed belt tooth surface in any one of Claim 1 to 3, it is especially polyurethane elastomer. Since the friction coefficient is high and the sound is easily generated by interference with the flange, the method for measuring the surface condition of the belt tooth surface of the present invention is effective.

  According to the invention described in claim 6, since the plate-like material is made of the same composition as the elastomer constituting the toothed belt, it is the method for measuring the surface condition of the toothed belt tooth surface according to claims 2 to 5. The friction coefficient of the toothed belt and the plate-like object is almost the same, stick slip does not occur, the toothed belt slips too much on the plate-like object, and the measured value of the friction coefficient of the belt tooth surface becomes extremely small There is no.

  According to invention of Claim 7, it has several tooth parts arrange | positioned along a length direction, and the back part which embed | buried the core wire, and a tooth part and a tooth space are alternated at equal pitches in the belt length direction. A toothed belt arranged side by side with a polyurethane elastomer as a base material and a urethane belt in which a tensile body is embedded in a urethane elastic body, and a polyurethane layer including a siloxane bond formed on the tooth surface of the urethane belt A method for measuring the surface condition of a belt, wherein the belt teeth of the same belt are opposed to each other, the tooth portions are fitted into the opposed tooth grooves, the tooth portions are moved along the tooth grooves, and the tensile force in the moving direction is increased. Since this is a method for measuring the surface condition of a toothed belt tooth surface made of urethane that calculates the coefficient of friction from the frictional force of the belt tooth surface in a superposed state, the deformation of the belt tooth tip is reduced and the friction is reduced. Stick-slip is hardly generated during the force measurement, the measurement error is also an effect that can be obtained without a reliable friction coefficient data.

  According to invention of Claim 8, it has a several tooth part arrange | positioned along a length direction, and the back part which embed | buried the core wire, and a tooth part and a tooth space are alternated at equal pitches in a belt length direction. A toothed belt arranged side by side with a polyurethane elastomer as a base material and a urethane belt in which a tensile body is embedded in a urethane elastic body, and a polyurethane layer including a siloxane bond formed on the tooth surface of the urethane belt A method for measuring the surface state of a belt, wherein as a counterpart material for measuring the surface state of a toothed belt tooth surface, a tooth groove having substantially the same shape as a belt tooth is formed in a plate-like body, and the belt tooth is formed into the plate shape. A toothed belt tooth made of urethane that fits the tooth gap of the body, calculates the friction coefficient from the friction force of the belt tooth surface by moving the tooth portion along the tooth gap and measuring the tensile force in the moving direction Surface state measurement method Therefore, deformation of the belt tooth tip is reduced, stick slip is less likely to occur at the time of friction force measurement, and reliable friction coefficient data can be obtained without measurement error, and the counterpart material is always the same, The surface condition of the belt teeth can be relatively evaluated.

  According to the invention described in claim 9, the surface condition measuring method for the tooth belt surface of the toothed belt according to claim 7, wherein the friction force is a friction force between tooth pressure surfaces extending in a tooth width direction of the toothed belt. Therefore, since no pressure is applied to the tooth tip surface, there is an effect that the tooth tip is not deformed and stick slip does not occur and more reliable friction coefficient data can be obtained.

  According to the invention described in claim 10, the tooth according to claim 7, wherein the toothed belt is a helical toothed belt formed such that the extending direction of the belt teeth forms a predetermined angle with respect to the belt width direction. Since this is a method for measuring the surface state of a toothed belt tooth surface, it is particularly effective for a helical toothed belt that easily interferes with a pulley flange.

  According to the invention described in claim 11, the surface state measuring method of the tooth surface of the toothed belt according to any one of claims 8 to 10, wherein the plate-like body is made of the same composition as the polyurethane elastomer constituting the toothed belt. Therefore, the friction coefficient of the toothed belt and the plate-like body is almost the same, stick slip does not occur, the toothed belt slips too much on the plate-like body, and the measured value of the friction coefficient of the belt tooth surface is extremely It never gets smaller.

Hereinafter, the best mode for carrying out the present invention will be described.
FIG. 1 is an overall perspective schematic view of a toothed belt according to an embodiment of the present invention. Figure 1 is a toothed belt 1, the belt tooth portion 10 at a predetermined pitch P ₁ is provided in the belt length direction. Here, a polyurethane elastomer is mainly used for the belt body. Further, a core wire 13 as a tensile body is provided between the belt tooth portion 10 and the belt back portion 12 so as to extend substantially in the belt length direction and form a pitch in the belt width direction. As the core wire 13, glass fiber, aramid fiber, polyester fiber, steel strand twisted yarn, etc., which has been subjected to adhesion treatment with resorcin / formalin / latex solution or the like is used.

FIG. 2 is an overall perspective schematic view of another toothed belt according to the embodiment of the present invention. Figure 2 is a helical toothed belt 2, and the belt tooth portion 10 at a predetermined pitch P ₁ is provided in the belt length direction, the direction of extension of the teeth 10 of the belt prescribed to the belt width direction The angle α is formed. Here, a polyurethane elastomer is mainly used for the belt body. Further, a core wire 13 as a tensile body is provided between the belt tooth portion 10 and the belt back portion 12 so as to extend substantially in the belt length direction and form a pitch in the belt width direction. As the core wire 13, glass fiber, aramid fiber, polyester fiber, steel strand twisted yarn, etc., which has been subjected to adhesion treatment with resorcin / formalin / latex solution or the like is used.

The polyurethane cured product forming the polyurethane belt is obtained by casting and heating and curing a liquid polyurethane resin composition. Generally, as a molding method, a premix in which a polyol catalyst, a chain extender, a pigment and the like are mixed is used. A one-shot method in which a liquid and a solution containing an isocyanate component are mixed and cast and cured, and a prepolymer in which isocyanate and polyol are reacted in advance and a part of the isocyanate is modified with polyol, There is a prepolymer method in which a catalyst is added to this and cast, followed by a curing reaction. In the present invention, the prepolymer method is preferably employed.

Although it does not limit as isocyanate, Aromatic polyisocyanate, aliphatic polyisocyanate, alicyclic polyisocyanate, and those modified substances can be used. Specific examples include toluene diisocyanate (TDI), methylene diisocyanate (MDI), xylylene diisocyanate (XDI), naphthalene diisocyanate (NDI), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPDI). And MDI are preferably used.

  Examples of the polyol include ester polyols, ether polyols, acrylic polyols, polybutadiene polyols, and mixed polyols thereof. Examples of ether polyols include polyethylene ether glycol (PPG) and polytetramethylene ether glycol (PTMG). Examples of ester polyols include polyethylene adipate (PEA), polybutylene adipate (PBA), and polyhexamethylene adipate ( PHA), poly-ε-caprolactone (PCL) and the like. Among them, polytetramethylene ether glycol (PTMG) is preferably used because it is excellent in moisture resistance and water resistance and can give a molded product having tough physical properties and small hysteresis loss.

In the present invention, the amine-based curing agent is not particularly limited, but 1,4-phenylenediamine, 2,6-diaminotoluene, 1,5-naphthalenediamine, 4,4′-diaminodiphenylmethane, 3 , 3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 3,3'-dimethyl-4,4'-diaminodiphenylmethane, 1-methyl-3,5-bis (methylthio) -2,6-diamino Benzene, 1-methyl-3,5'-diethyl-2,6-diaminobenzene, 4,4'-methylene-bis- (3-chloro-2,6-diethylaniline), 4,4'-methylene-bis -(3-chloro-2,6-diethylaniline), 4,4'-methylene-bis- (ortho-chloroaniline), 4,4'-methylene-bis- (2,3-dichloro) Nilin), trimethylene glycol-di-para-aminobenzoate, 4,4'-methylene-bis- (2,6-diethylaniline), 4,4'-methylene-bis- (2,6-diisopropylaniline), Examples include primary amine, secondary amine, tertiary amine amine compounds such as 4,4'-diaminodiphenylsulfone. The compounding amount of the amine curing agent is preferably such that the α value (NH ₂ / NCO), which is the ratio of the number of moles of NH ₂ in the amine curing agent to the number of moles of NCO in the isocyanate, is about 1. It is good to set it in the range of 0.90 to 1.10. Generally, the physical property of the cured product is the best when the α value is around 0.95, and when the α value is out of the above range, the physical property of the cured product tends to decrease.

  In the present invention, a silicone oil having an active hydrogen uniformly at the terminal end, for example, a silicone oil represented by the structural formula 1 can be used on the surface of the mold used.

  Such silicone oils are also called silicone diols, and those having a hydroxyl value of 20 to 120 and an average molecular weight of about 1000 to 6000 can be obtained as commercial products (for example, KF-6003 manufactured by Shin-Etsu Chemical Co., Ltd.). it can.

Below, an example of the manufacturing method of the urethane belt of this invention is shown.
First, an outer mold and an inner mold are prepared, and the outer mold is exemplified by a flat one. Further, if the inner mold is a toothed belt, a groove for forming a tooth portion of the belt is formed in the longitudinal direction of the mold, and a protrusion called a nose is also provided in the longitudinal direction.

FIG. 3 is an example of a sectional view of a mold used in the method for producing a urethane belt of the present invention. According to this, the mold 51 includes an outer mold 54 and an inner mold 55 that is inserted into the outer mold 54, and the space portion 56 that fills the casting elastomer is provided between the outer mold 54 and the inner mold 55. is doing.
Although the inner die 55 has a flat outer peripheral surface, it may be a die for a toothed belt provided with a groove extending in the axial direction.
And the mold release agent containing the silicone oil which has an active hydrogen at the said terminal is apply | coated to the metal mold | die which forms the surface which needs to reduce a friction coefficient continuously in use to the metal mold | die 51 prepared above. Further, the inner die 55 is mechanically fixed to a spinning device (not shown) installed above the outer die 54 by a fixing member such as a screw, and the core wire 13 is spiraled on the outer peripheral surface while the inner die 55 is rotated. Wrap around. At the time of spinning, the inner die 55 is positioned directly above the outer die 54 while being suspended from the spinning device.
As the core wire 13 to be used, any of para-type aramid fiber (trade name: Twaron, Kevlar, Technora), glass fiber (E glass, high-strength glass), or polyester fiber may be used. Its configuration, thickness, number of twists It is not influenced by etc.

A predetermined amount of liquid elastomer is injected into the outer mold 54 installed on the movable table 65 in advance, and then the table 65 is moved directly above to insert the outer mold 54 into the inner mold 55. The inner die 55 is placed in the outer die 54, and the inner die 55 is separated from a fixing member such as a screw of the spinning device. Thereafter, the upper lid 66 is closed and the inside of the mold is sealed and decompressed to remove bubbles in the liquid elastomer, and then the liquid elastomer is allowed to flow upward.
In addition, since the moving direction of the outer mold 54 is set and the inner mold 55 is fixed in position, the deviation of the center position between the outer mold 54 and the inner mold 55 is small, and the thickness of the belt molded body 58 is uniform. .
Further, it is not necessary to cast the liquid elastomer into the outer mold 54 in advance, and after the inner mold 55 is installed on the outer mold 54, the liquid elastomer is cast into the space 56 between the outer mold 54 and the inner mold 55. May be.

  When the liquid elastomer finishes rising, the upper lid 66 is removed, air is introduced into the mold and pressurized, and the liquid elastomer is cured at a predetermined temperature. The mold temperature at this time is adjusted to 80 to 150 ° C. The mold temperature can be adjusted by passing a heat medium such as steam or oil through the outer mold 54 or by arranging a jacket through which the heat medium passes outside the outer mold 54.

  After the curing, as shown in FIG. 4, the outer mold 54 is moved right below to remove the outer mold 54 fitted with the belt molded body 58 from the inner mold 55, and after this is completed, the belt molded body 58 is removed from the outer mold 54.

  The endless belt molded body is cut to a predetermined width to form a urethane belt. The present invention relates to a method for measuring the surface condition of the tooth surface of the toothed belt of FIG.

As shown in FIG. 5, the toothed pulley 3 that meshes with the helical toothed belt is provided with pulley grooves 21 that mesh with the toothed portion 10 of the helical toothed belt at a predetermined pitch P < _b > _2. The extending direction of the pulley groove 21 forms a predetermined angle β with respect to the pulley width direction, which is the same as the angle formed by the extending direction of the belt tooth portion 10 with respect to the belt width direction. The outer diameter of the drive pulley 2 is set to be larger than the outer diameter when the pitch of the tooth portion 10 of the belt and the pitch of the pulley groove 21 are the same. Therefore, the pitch of the tooth portion 10 of the belt is set. towards the pitch P ₂ of the pulley groove 21 of the drive pulley 2 is slightly larger than P _1.

As shown in FIGS. 6 and 7, the toothed belt tooth surface measurement method of the present invention performs measurement by overlapping the tooth surfaces within one belt. That is, by causing the belt teeth of the same belt to face each other and fitting the tooth portion 10 to the facing tooth groove 11, moving the tooth portion 10 along the tooth groove 11, and measuring the tensile force in the moving direction. This is a method for measuring the surface state of a toothed belt tooth surface, in which the friction coefficient is calculated from the friction force of the belt tooth surface in a superposed state. Specifically, a weight having a load WN is placed on the back surface of the belt meshing the tooth surfaces, and one belt is pulled at a constant speed in the belt width direction. The tensile force FN at this time is obtained, and the friction coefficient of the belt tooth surface is calculated by F / W.

In another embodiment of the present invention, a plate-like body 41 as shown in FIG. 8 having a tooth groove 43 engraved thereon is used as a counterpart material, and the tooth portion 10 of the toothed belt 1 is attached to the toothed belt 1 as shown in FIG. The friction coefficient is calculated from the frictional force of the belt tooth surface by fitting the toothed portion 43 of the plate-like body 41, moving the tooth portion 10 along the toothed portion 43, and measuring the tensile force in the moving direction. This is a method for measuring the surface condition of a toothed belt tooth surface.

The material of the plate-like body is preferably the same as the material of the tooth surface of the toothed belt. For example, the material of the plate-like body is made of the same composition as the elastomer constituting the toothed belt. Specifically, for example, the plate-like body is formed with the same composition as the polyurethane elastomer of the toothed belt, and tooth grooves having substantially the same shape as the tooth portions of the toothed belt are engraved on the plate-like body.

As Example 1, as a toothed belt molding die, an inner die in which grooves for forming belt teeth are formed on the outer circumferential surface in the longitudinal direction of the die, and the inner circumferential surface is a normal circumferential surface. A casting method was used in which a belt sleeve was obtained by casting liquid polyurethane into a cavity formed by an outer mold and an inner mold.
A silicone oil composed of a low-viscosity silicone oil D having a viscosity of 90 cp and a silicone oil B having a viscosity of 1 × 10 ³ cp, a component as a release agent in the inner mold, and a terminal having active hydrogen at the terminal, fluorine An aqueous release agent (FRX-M52) containing a compound and a wax was used. At this time, silicone oil B was blended less than silicone oil D. The release agent was uniformly applied to the inner mold. Next, a core wire made of aramid fibers is spirally spun into the inner mold with a predetermined tension, and then a predetermined amount of liquid polyurethane raw material (100 parts by mass of prepolymer, 3,3′-dicyclo-4,4′aminodiphenylmethane The outer mold in which 12 parts by mass of a certain curing agent and 0.2 parts by mass of the catalyst were cast was moved and inserted into the inner mold. The space was sealed with an upper lid, depressurized and defoamed to raise the liquid polyurethane, and then the liquid polyurethane was cured at 110 ° C. for 20 minutes. Thereafter, the urethane sheet was removed from the outer mold and aged at an atmospheric temperature of 60 ° C. to obtain a belt sleeve. The belt sleeve was cut to a width of 5 mm to produce a urethane toothed belt. The belt size was 700ST1.0. Then, the tooth surfaces of the belt are engaged with each other and placed on a friction measuring machine TR type slide table manufactured by Toyo Seiki Seisakusho, and the lower belt is placed on the back of the belt so that the belt width direction matches the table moving direction. A 200 gf weight was placed as a load and fixed to the table. And the wire connected with the load measuring machine was fixed to the upper belt with a hook, and the table was moved at a speed of 24 mm / min. And the frictional force for 40 seconds was measured from the time of the table movement start by the method as shown in FIG.6 and FIG.7 at this time. Also, a dynamic friction coefficient as shown in FIG. 10 was calculated.

Next, as Example 2, a silicone compound having no active hydrogen at the terminal and an aqueous release agent comprising a fluorine compound, a wax, an emulsifier, and water were used, and the release agent was uniformly formed in the same inner shape as in Example 1. It was applied to. Then, a toothed belt was produced by the same method as in Example 1, and the friction coefficient was calculated under the same conditions as in Example 1. Also, a dynamic friction coefficient as shown in FIG. 10 was calculated.

Next, as a conventional example 1, a tetrafluoropolyethylene plate is fixed to the table of the same friction coefficient measuring machine as in the example by the method shown in FIG. A belt having a length of 50 mm was placed on the plate so that the belt width direction coincided with the table moving direction, and a wire connected to the load converter was connected to the belt with a hook. A 180 g weight was placed on the back of the belt and fixed to the table. Then, the table was moved at a speed of 100 mm / min. The frictional force for 30 seconds was measured from the start of table movement at this time. Also, a dynamic friction coefficient as shown in FIG. 11 was calculated.

  Next, as Conventional Example 2, a tetrafluoropolyethylene plate was fixed to the table of the same friction coefficient measuring machine as in the Example, and the friction coefficient of the belt of Example 2 was measured under the same conditions as in Conventional Example 1. Also, a dynamic friction coefficient as shown in FIG. 11 was calculated.

From FIGS. 10 and 11, there is a clear difference between the dynamic friction coefficients of Examples 1 and 2, but there is no significant difference in the dynamic coefficient of friction between the conventional examples 1 and 2. In Examples 1 and 2, the effect of improving the surface condition of the belt can be clearly confirmed.

It is the whole perspective schematic diagram of a toothed belt which can use the measuring method of the present invention effectively. 1 is an overall perspective schematic view of a helical toothed belt in which the measuring method of the present invention can be used effectively. It is an example of sectional drawing of the metal mold | die used for the manufacturing method of the urethane belt which concerns on this invention. It is sectional drawing which shows the state which has released the inner type | mold and the outer type | mold in the manufacturing method of the urethane belt which concerns on this invention. It is the partial schematic diagram which showed the pulley which meshes with the helical toothed belt which can use the measuring method of this invention effectively. It is the schematic which showed the surface state measuring method of the toothed belt tooth surface of this invention. It is the schematic which showed the surface state measuring method of the toothed belt tooth surface of this invention. It is the schematic which showed the other party material used in other embodiment of this invention. It is the schematic which showed the surface state measuring method of the other toothed belt tooth surface of this invention. It is the graph which measured the dynamic friction coefficient of the belt tooth surface by the measuring method of the present invention. It is the graph which measured the dynamic friction coefficient of the belt tooth surface by the conventional measuring method. It is the schematic which showed the surface state measuring method of the conventional toothed belt tooth surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toothed belt 2 Lotus toothed belt 3 Toothed pulley 10 Tooth part 11 Tooth groove 12 Back part 13 Core wire 21 Pulley groove 31 Opposite material 33 Weight 41 Plate body 43 Tooth groove F Pulling force P ₁ Belt tooth pitch P ₂ Pulley groove pitch of pulley α Angle formed by the belt teeth extending direction with belt length β Angle formed by pulley pulley groove extending direction with pulley shaft direction

Claims (11)

  A toothed belt tooth surface having a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded and having tooth portions and tooth grooves alternately arranged at equal pitches in the belt length direction. In this method, the belt teeth of the same belt are opposed to each other, the tooth portions are fitted into the opposed tooth grooves, the tooth portions are moved along the tooth grooves, and the tensile force in the moving direction is measured. A method for measuring the surface condition of a toothed belt tooth surface, wherein the coefficient of friction is calculated from the friction force of the belt tooth surface in a superposed state by measuring.   A toothed belt tooth surface having a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded and having tooth portions and tooth grooves alternately arranged at equal pitches in the belt length direction. As a counterpart material for measuring the surface state of the toothed belt tooth surface, a tooth-like groove having substantially the same shape as the belt teeth is formed on the plate-like body, and the belt teeth are formed on the plate. The friction coefficient is calculated from the frictional force of the belt tooth surface by fitting in the tooth gap of the body, moving the tooth portion along the tooth gap, and measuring the tensile force in the moving direction. A method for measuring the surface condition of a toothed belt tooth surface.   The method for measuring the surface condition of a toothed belt tooth surface according to claim 1 or 2, wherein the frictional force is a frictional force between tooth pressure surfaces extending in a tooth width direction of the toothed belt.   The toothed belt tooth surface according to any one of claims 1 to 3, wherein the toothed belt is a helical toothed belt formed such that a direction in which the belt teeth extend forms a predetermined angle with respect to the belt width direction. Surface state measurement method.   The method for measuring the surface condition of a toothed belt tooth surface according to any one of claims 1 to 4, wherein a material of the toothed belt is polyurethane elastomer.   The method for measuring the surface condition of a toothed belt tooth surface according to claim 2, wherein the plate-like material is made of the same composition as the elastomer constituting the toothed belt.   A toothed belt having a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded, and having tooth portions and tooth grooves alternately arranged at equal pitches in the belt length direction. In a urethane belt having a polyurethane elastomer as a base material and a tensile body embedded in a urethane elastic body, a urethane belt surface state measuring method in which a polyurethane layer containing a siloxane bond is formed on the tooth surface of the urethane belt, In a superposed state, the belt teeth of the same belt face each other, the tooth portions are fitted into the facing tooth spaces, the tooth portions are moved along the tooth spaces, and the tensile force in the moving direction is measured. A method for measuring the surface condition of a toothed belt surface of a urethane tooth, wherein a friction coefficient is calculated from a frictional force of the belt tooth surface.   A toothed belt having a plurality of tooth portions arranged along the length direction and a back portion in which a core wire is embedded, and having tooth portions and tooth grooves alternately arranged at equal pitches in the belt length direction. In a urethane belt having a polyurethane elastomer as a base material and a tensile body embedded in a urethane elastic body, a urethane belt surface state measuring method in which a polyurethane layer containing a siloxane bond is formed on the tooth surface of the urethane belt, As a counterpart material for measuring the surface state of the toothed belt tooth surface, a tooth-like groove having substantially the same shape as the belt tooth is engraved on the plate-like body, the belt tooth is fitted into the tooth groove of the plate-like body, Measuring the surface condition of a toothed belt with a urethane tooth by moving the teeth along the tooth gap and calculating the friction coefficient from the friction force of the belt tooth surface by measuring the tensile force in the moving direction. Method.   The method for measuring the surface condition of a toothed belt surface of urethane according to claim 7 or 8, wherein the frictional force is a frictional force between tooth pressure surfaces extending in a tooth width direction of the toothed belt.   The urethane toothed belt tooth according to any one of claims 7 to 9, wherein the toothed belt is a helical toothed belt formed such that a direction in which the belt teeth extend forms a predetermined angle with respect to the belt width direction. Surface state measurement method. The method for measuring the surface condition of a tooth surface of a urethane toothed belt according to any one of claims 8 to 10, wherein the plate-like material is made of the same composition as the polyurethane elastomer constituting the toothed belt.

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