JP2021196031A - Torsional damper and method for manufacturing the same - Google Patents

Abstract

To provide a method for manufacturing a torsional damper that can acquire a torsional damper that has high slip torque.SOLUTION: A method for manufacturing a torsional damper includes: a preheating process of preheating an unprocessed vibration ring and an unprocessed hub and providing a post-preheated vibration ring and a post-preheated hub having temperature of 50-130°C; an application step of applying torque improvement liquid to the post-preheated vibration ring and the post-preheated hub, and then drying them to provide a post-dried vibration ring and a post-dried hub; and a fitting step of fitting a rubber ring applied with fitting liquid to a part between the post-dried vibration ring and the post-dried hub.SELECTED DRAWING: Figure 1

Description

The present invention relates to a torsional damper and a method for manufacturing the same.

A torsional damper (hereinafter, also referred to as TVD) is a product in which a rubber ring is fitted between a hub and a vibration ring. This product is attached to the tip of the crankshaft and has the function of reducing the torsional vibration of the crank as a dynamic damper and transmitting power to auxiliary equipment (alternator, air conditioner, water pump) via the belt.
Therefore, torque is generated in the rubber ring between the hub and the vibrating ring, but in order to maintain the function, the rubber ring must not slip even when a certain torque is generated. Therefore, a silane coupling type torque improving liquid is applied between the hub and the rubber ring and between the vibration ring and the rubber ring to improve the torque.

As a conventional method relating to this, for example, the method described in Patent Document 1 can be mentioned.
In Patent Document 1, an adhesive obtained by adding an organic phosphorus compound to a mercapto group-containing silane coupling agent is applied to the outer peripheral surface of the rim portion and the inner peripheral surface of the annular mass, dried, and then the annular rubber is applied to the rim portion. A method for manufacturing a torsional damper is described, which comprises press-fitting from the axial side between the outer peripheral surface and the inner peripheral surface of the annular mass (see claim 6). Then, according to such a manufacturing method, an annular rubber is press-fitted between the facing peripheral surfaces of the metal hub and the metal annular mass arranged on the outer peripheral side of the hub, and heat treatment after fitting is not always necessary. It is stated that it is possible to provide a torsional damper having a sliding torque equal to or higher than that provided with an adhesive layer containing only a conventional mercapto group-containing silane coupling agent. ing.

Japanese Unexamined Patent Publication No. 2005-16655

The sliding torque of the torsional damper is preferably higher. An object of the present invention is to provide a method for manufacturing a torsional damper capable of obtaining a torsional damper having a high sliding torque, and a torsional damper obtained by the manufacturing method.

The present inventor has diligently studied to solve the above problems and completed the present invention.
The present invention is the following (1) to (3).
(1) A preheating step of preheating the untreated vibrating ring and the untreated hub to obtain the preheated vibrating ring and the preheated hub at 50 to 130 ° C.
A coating step of applying a torque improving solution to the preheated vibration ring and the preheated hub and then drying to obtain a dried vibrating ring and a dried hub.
A fitting step of fitting a rubber ring coated with a fitting liquid between the dried vibrating ring and the dried hub.
A method of manufacturing a torsional damper.
(2) The method for manufacturing a torsional damper according to (1) above, wherein in the preheating step, the untreated vibration ring and the untreated hub are degreased and then preheated.
(3) A torsional damper manufactured by the method for manufacturing a torsional damper according to the above (1) or (2).

According to the present invention, it is possible to provide a method for manufacturing a torsional damper capable of obtaining a torsional damper having a high sliding torque, and a torsional damper obtained by the manufacturing method.

It is a schematic perspective view which illustrates the embodiment of the torsional damper obtained by the manufacturing method of this invention. It is a schematic cross-sectional perspective view of the torsional damper shown in FIG. It is a schematic cross-sectional perspective view which illustrates the embodiment of the post-drying vibration ring, the post-drying hub and the rubber ring used in the manufacturing method of this invention. It is a graph which shows the result of Experiment 1.

The manufacturing method of the present invention will be described with reference to the drawings.
The manufacturing method of the present invention comprises a preheating step of preheating an untreated vibration ring and an untreated hub to obtain a preheated vibration ring and a preheated hub having a temperature of 50 to 130 ° C., and a preheated vibration ring and the preheated hub. A rubber ring coated with a fitting liquid is provided between the post-drying vibration ring and the post-drying hub in a coating step of applying a torque improving solution to the product and then drying it to obtain a post-drying vibration ring and a post-drying hub. It is a method of manufacturing a torsional damper including a fitting step of fitting.

First, the torsional damper obtained by the manufacturing method of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a schematic perspective view illustrating an embodiment of the torsional damper obtained by the manufacturing method of the present invention, and FIG. 2 is a schematic sectional perspective view of the torsional damper shown in FIG.

The torsional damper 1 of the embodiment illustrated in FIGS. 1 and 2 can be used by being attached to the tip of the crankshaft of an engine of a vehicle or the like. The torsional damper 1 has a function of absorbing the torsional resonance of the shaft of the crank shaft and suppressing engine vibration and noise. It also acts as a drive pulley that transmits the rotation of the crankshaft to the auxiliary equipment via the belt.
The torsional damper 1 has a hub 3, a vibration ring 5, and a rubber ring 7.

The hub 3 includes a boss portion 31, a stay portion 33, and a rim portion 35.
The boss portion 31 is provided at the center portion in the radial direction of the hub 3. The boss portion 31 is fastened to the tip of the crankshaft, and the hub 3 is rotationally driven around the central axis X.
The stay portion 33 extends radially from the boss portion 31.
The rim portion 35 is provided on the outer peripheral side of the stay portion 33. The rim portion 35 has a cylindrical shape, and the vibration ring 5 is connected to the outer peripheral side of the rim portion 35 via the rubber ring 7.
Each of the boss portion 31, the stay portion 33, and the rim portion 35 can be formed by using a metal material such as cast iron as a raw material.

The vibration ring 5 is arranged on the radial outer side of the hub 3, and a pulley groove 51 on which a belt is hooked is provided on the outer peripheral surface thereof. The pulley groove 51 functions as a pulley for power transmission.
The vibrating ring 5 can be formed by using a metal material such as cast iron as a raw material.

The rubber ring 7 is inserted in the gap between the outer peripheral surface of the hub 3 and the inner peripheral surface of the vibrating ring 5. The rubber ring 7 plays a role of reducing torsional vibration of the crankshaft generated during traveling of a vehicle or the like to prevent damage, and reducing noise and vibration of engine vibration.

The rubber ring 7 is made by vulcanizing a rubber composition containing ethylene / propylene / diene ternary copolymer (EPDM) as a main component, preferably carbon black or process oil, for example, into a cylindrical shape by a conventionally known method. Can be obtained by doing. Here, the rubber composition may contain zinc oxide, stearic acid, an antioxidant, a peroxide, a cross-linking agent and the like.
Natural rubber, blended rubber of natural rubber and styrene-butadiene copolymer, butadiene rubber, blended rubber of natural rubber and butadiene rubber, styrene-butadiene copolymer rubber, chloroprene rubber, acrylonitrile-butadiene copolymer rubber, hydrogenated A rubber composition can also be obtained by using acrylonitrile-butadiene copolymer rubber, ethylene-acrylate copolymer rubber, fluororubber, acrylic rubber or the like as a rubber material.

In the manufacturing method of the present invention, for example, the torsional damper 1 illustrated in FIGS. 1 and 2 can be obtained.
However, the torsional damper that can be obtained by the manufacturing method of the present invention is a rubber fitting type manufactured by press-fitting a rubber ring that has been vulcanized in advance between the outer peripheral surface of the hub and the inner peripheral surface of the vibration ring. If it is a torsional damper, it does not have to be the mode shown in FIGS. 1 and 2. According to the manufacturing method of the present invention, for example, a torsional damper having a conventionally known shape and material can be obtained.

<Preheating process>
The preheating step in the manufacturing method of the present invention will be described.
In the preheating step, the untreated vibrating ring and the untreated hub are preheated by heating them to a temperature of 50 to 130 ° C.
The untreated vibrating ring and the untreated hub refer to those having the same shape and the same material as the vibrating ring 5 and the hub 3 as exemplified in FIGS. 1 and 2, but in a state before preheating.

The method for preheating the untreated vibrating ring and the untreated hub is not particularly limited. For example, the untreated vibrating ring and the untreated hub can be preheated by heating the untreated vibrating ring and the untreated hub to a temperature of 50 to 130 ° C. by a conventionally known method. For example, it can be heated by placing the inside in a heating furnace adjusted to 50 to 130 ° C. The temperature in the heating furnace is preferably 70 to 130 ° C.

Here, the temperature of the untreated vibrating ring and / or the untreated hub means the surface temperature of the untreated vibrating ring and / or the untreated hub measured by a non-contact infrared thermometer.

Adjusting the untreated vibrating ring and untreated hub to the above temperature and applying the torque improver before the temperature drops too much, that is, while the temperature is between 50 and 130 ° C, will improve the applied torque. The present invention is used because the liquid sufficiently reacts with the untreated vibration ring and the untreated hub to firmly adhere to the untreated vibration ring, and in addition, the torque improving liquid sufficiently reacts with the rubber ring fitted in the fitting step described later. The present inventor has found that the sliding torque of the torsional damper obtained by the manufacturing method of the above is further improved. In addition, the present inventor has confirmed that the effect is weakened if the temperature is too high or too low.

Here it is preferred to degreas the untreated vibrating ring and / or the untreated hub before preheating.
The method of degreasing is not particularly limited, and for example, degreasing can be performed by a conventionally known method. For example, it can be degreased by an alkaline degreasing method using an alkaline chemical or the like.

By such a preheating step, a preheated oscillating ring and a preheated hub having a temperature of 50 to 130 ° C. can be obtained.

<Applying process>
The coating process in the production method of the present invention will be described.
In the coating process, the torque improving liquid is applied to the preheated vibration ring and the preheated hub.
The preheated ring and the preheated hub have the same shape and the same material as the vibrating ring 5 and the hub 3 as exemplified in FIGS. 1 and 2, and are in a state of being preheated by the above-mentioned preheating step. ..

As the torque improving liquid, a solution in which a silane coupling agent is mainly dissolved in a hydrocarbon solution (solvent) such as toluene or xylene can be used.
As the silane coupling agent, a urethane-based silane coupling agent, an epoxy-based silane coupling agent, or a vinyl-based silane coupling agent can be used, but an amino group-containing silane coupling agent or a mercapto group-containing silane coupling agent is used. Is preferable. This is because the torque improving effect is high.
Examples of the amino group-containing silane coupling agent include γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, and γ- (2-aminoethyl). ) Aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltriethoxysilane, γ- (2-aminoethyl) aminopropylmethyldiethoxysilane, Examples thereof include γ-ureidopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-benzyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-γ-aminopropyltriethoxysilane and the like.
Examples of the mercapto group-containing silane coupling agent include γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxysilane, and γ-mercaptopropylmethyldiethoxysilane.
A plurality of types of silane coupling agents may be mixed and used.

The torque improving solution mainly contains a silane coupling agent (preferably an amino group-containing silane coupling agent or a mercapto group-containing silane coupling agent), and more preferably contains a titanium acetylacetonate compound or an organic phosphorus compound.
Examples of the organic phosphorus compound include an organic phosphine compound, a quaternary phosphonium salt, an organic phosphoric acid compound and the like.
In the torque improving solution, the titanium acetylacetonate compound is preferably contained in an amount of 5 to 100 parts by mass with respect to 100 parts by mass of the amino group-containing silane coupling agent.
Further, in the torque improving solution, the organic phosphorus compound is preferably contained in an amount of 1 to 100 parts by mass with respect to 100 parts by mass of the mercapto group-containing silane coupling agent.

In the coating process in the manufacturing method of the present invention, the torque improving liquid is applied to the preheated vibration ring and the preheated hub as described above.
The method of application is not particularly limited, and for example, it can be applied by a conventionally known method. For example, it can be applied by spraying, dipping, spraying or the like.

The torque improver is sufficiently applied to the part of the preheated vibration ring and the preheated hub that comes into contact with the rubber ring, that is, the inner peripheral surface of the preheated vibration ring and the outer peripheral side of the rim portion of the preheated hub. Is preferable. For example, it is preferable to apply the layer made of the torque improving liquid so that the thickness is 5 to 50 μm.

The torque improving liquid is applied to the preheated vibration ring and the preheated hub as described above, and then dried.

The method of drying the preheated vibration ring and the preheated hub coated with the torque improving liquid is not particularly limited. For example, it can be dried by heating by a conventionally known method.
For example, the preheated vibration ring and the preheated hub coated with the torque improving liquid can be heated and dried by placing the inside in a heating furnace adjusted to 40 to 130 ° C.
Further, for example, the torque improving liquid can be dried by storing the preheating vibration ring and the preheating hub coated with the torque improving liquid in a room at a specific temperature (for example, normal temperature) for a certain period (for example, one day or more). can.

By such a coating step, a post-drying vibrating ring and a post-drying hub can be obtained.

<Matching process>
The fitting process in the manufacturing method of the present invention will be described.
In the fitting step, a rubber ring coated with the fitting liquid is fitted between the post-drying vibration ring obtained by the coating step and the post-drying hub.

The fitting process will be described with reference to FIG.
FIG. 3 is a schematic cross-sectional perspective view for explaining a method of fitting a rubber ring between the post-drying vibration ring and the post-drying hub.
FIG. 3 shows a state in which the dried hub 30 and the dried vibrating ring 50 are arranged on a support (not shown) so that the boss portion 310 in the dried hub 30 is in the vertical direction.
In such a state, using a press-fitting jig such as a press machine, a rubber ring 70 is placed in the gap 80 between the outer peripheral surface of the rim portion 350 in the dried hub 30 and the inner peripheral surface of the dried vibrating ring 50. It can be press-fitted. Here, it is preferable that the width of the gap in the gap 80 is narrower than the thickness of the rubber ring 70. Specifically, the width of the gap of the gap 80 / the thickness of the rubber ring 70 is preferably about 0.6 to 0.9.

Here, it is preferable to apply the fitting liquid to the rubber ring 70 before fitting. The type of the fitting liquid and the method of applying the fitting liquid are not particularly limited, and for example, a conventionally known fitting liquid can be used. Further, the method of applying the fitting liquid is not particularly limited, and for example, a conventionally known fitting liquid can be used.

According to the manufacturing method of the present invention, it is not necessary to heat after fitting. It is possible to obtain a torsional damper having a sufficiently high sliding torque without heating.

It is preferable to perform alkaline cleaning after fitting the rubber ring between the vibration ring after drying and the hub after drying by the fitting step as described above. The method of alkaline cleaning is not particularly limited, and a conventionally known method, for example, a method of immersing in an alkaline solution can be applied.

Examples of the present invention will be described. The scope of the invention is not limited to the examples described below.

<Experiment 1>
Four sets of untreated vibrating rings and untreated hubs made of cast iron were prepared and degreased by an alkaline degreasing method using an alkaline chemical.
Then, three sets of these were placed one by one in the heating furnace and preheated to 70 ° C, 100 ° C, and 130 ° C, respectively, to obtain a preheated vibration ring and a preheated hub. .. In addition, the remaining one set was not preheated.
Immediately thereafter (before the temperature dropped), the torque improver was applied to the three sets of preheated vibrating rings and the preheated hub. Similarly, the torque improving liquid was applied to a set of untreated vibration rings and untreated hubs that had not been preheated.
Here, as the torque improving solution, a solution obtained by diluting 100 parts by mass of γ-mercaptopropyltrimethoxysilane and 20 parts by mass of tris (dichloropropyl) phosphate with 2000 parts by mass of toluene was used.

Next, the vibration ring and the hub coated with the torque improving liquid were dried by holding them in a heating furnace whose internal temperature was adjusted to 85 ° C. for 13 minutes to obtain a vibration ring after drying and a hub after drying.

Next, a rubber ring is prepared, a fitting liquid (phthalate ester-based plasticizer) is applied to the rubber ring, and as shown in FIG. 3, a press-fitting jig such as a press machine is used to dry the rubber ring on the hub. A rubber ring was press-fitted into the gap between the outer peripheral surface of the rim portion and the inner peripheral surface of the vibration ring after drying. Then, it was immersed in an alkaline cleaning solution to wash and remove the fitting solution.

As the rubber ring, a rubber composition containing EPDM as a main component was used, which was obtained by cross-linking and molding the following compound composition at 180 ° C. for 6 minutes.
EPDM (Sumitomo Chemical): 100 parts by mass HAF carbon black: 50 parts by mass Zinc flower: 5 parts by mass Stearic acid: 0.5 parts by mass Dicumyl peroxide: 3 parts by mass

In this way, the torsional dampers shown in FIGS. 1 and 2 were obtained.

Next, the sliding torque was measured for the four types of torsional dampers obtained.
In this measurement, after fixing the hub and the vibrating ring, a load in the circumferential direction is applied in increments of 20 Nm, and this state is held for 1 minute, and the relative torsional displacement of the hub and the vibrating ring is held within this holding time. If is less than 2 degrees, the load is further increased by 20 Nm and held for 1 minute, and the torque when the relative torsional displacement of the hub and the vibration ring becomes 2 degrees or more within the holding time is the slip torque value. And said.
The results are shown in FIG. In FIG. 4, a set of untreated vibration rings that were not preheated and a torquer damper (hereinafter, also referred to as “comparison target”) obtained from the untreated hub are used as a reference (1.0), and a relative value thereof is used. The slip torque value is shown as.

As shown in FIG. 4, the slip torque of the torsional damper when preheated at 70 ° C., 100 ° C., and 130 ° C. showed better values than the slip torque of the torsional damper to be compared.

<Experiment 2>
In Experiment 1, the vibrating ring and hub coated with the torque improving liquid were dried by holding them in a heating furnace adjusted to a specific internal temperature to obtain a vibrating ring after drying and a hub after drying. The vibration ring and the hub coated with the torque improving liquid were kept in a room adjusted to 23 ° C. for 24 hours to be dried to obtain a vibration ring after drying and a hub after drying.
Then, other than that, the same processing as in Experiment 1 was performed, and the same slip torque measurement was performed.

As a result, as in the case of Experiment 1, the sliding torque of the torsional damper when preheated at 70 ° C., 100 ° C., and 130 ° C. showed a better value than the sliding torque of the torsional damper to be compared. rice field.

1 Tortional damper 3 Hub 31 Boss 33 Stay 35 Rim 5 Vibration ring 51 Pulley groove 7 Rubber ring 30 Hub after drying 310 Boss 350 Rim 50 Vibration ring after drying 80 Gap

Claims (3)

A preheating step of preheating the untreated vibrating ring and the untreated hub to obtain the preheated vibrating ring and the preheated hub at 50 to 130 ° C.
A coating step of applying a torque improving solution to the preheated vibration ring and the preheated hub and then drying to obtain a dried vibrating ring and a dried hub.
A fitting step of fitting a rubber ring coated with a fitting liquid between the dried vibrating ring and the dried hub.
A method of manufacturing a torsional damper. The method for manufacturing a torsional damper according to claim 1, wherein in the preheating step, the untreated vibration ring and the untreated hub are degreased and then preheated. A torsional damper manufactured by the method for manufacturing a torsional damper according to claim 1 or 2.

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