JP5305876B2 - Manufacturing method of driven side rotating body, driven side rotating body, clutch device including the driven side rotating body, and manufacturing method of the clutch device - Google Patents

Description

The present invention relates to a method of manufacturing a driven-side rotating body that is disposed between a prime mover and a driven body that is rotationally driven by the prime mover, and that constitutes a clutch device that transmits or interrupts the driving force of the prime mover to the driven body. The present invention relates to a body, a clutch device provided with the driven-side rotating body, and a method of manufacturing the clutch device .

  Generally, in a vehicle such as a four-wheeled vehicle or a two-wheeled vehicle, a clutch device that transmits or interrupts a driving force of a prime mover such as an engine to a driven body such as a wheel is used. The clutch device transmits or blocks the driving force of the prime mover to the driven body by bringing the driven side rotational body into contact with or separating from the driven rotational body that rotates by driving the prime mover. In this case, the contact surface of the driving-side rotator that rotates by driving the prime mover with the driven-side rotator has a friction characteristic that improves the frictional force against the driven-side rotator while suppressing the occurrence of vibration and noise due to friction. A friction material is provided for the purpose. Further, the contact surface of the driven-side rotating body with the friction material is subjected to a surface hardening process for the purpose of improving the wear resistance against the friction material and maintaining the friction characteristics.

Conventionally, as the surface hardening process of the driven-side rotator constituting the clutch device, for example, as shown in Patent Document 1 below, a nitriding process or a quenching process is used. In the nitriding treatment, nitrogen is infiltrated into the contact surface of the driven- side rotator to form a nitride compound layer made of a nitride compound, and the contact surface is cured. On the other hand, in the quenching treatment, carbon is infiltrated into the contact surface in the driven side rotating body to form a carburized layer, and the heated carburized layer is rapidly cooled to martensite transform and harden. (Carburizing and quenching). Of these surface hardening treatments, the quenching treatment has a large dimensional change after the quenching treatment, and therefore, generally, nitriding treatment (gas soft nitriding treatment) is frequently used for the surface hardening treatment in the driven-side rotating body.

  However, in the nitriding treatment in the driven-side rotator, a porous layer made of ultrafine particles is formed on the surface of the nitride compound layer formed on the surface layer of the driven-side rotator. Since this porous layer is brittle, the driven-side rotating body is gradually crushed and disappears when it contacts the driving-side rotating body for a long time, and the contact surface of the driven-side rotating body with the driving-side rotating body (friction material) Becomes mirrored. In particular, in a wet clutch device having a structure in which the driving side rotating body and the driven side rotating body are immersed in oil, the inside of the minute oil groove formed to hold the oil on the contact surface of the driven side rotating body. In addition, the brittle fractured porous layer particles enter to mirror the contact surface. For this reason, there has been a problem that the frictional characteristics of the driving side rotating body and the driven side rotating body change, and the power transmission characteristics in the clutch device change over time.

  In addition, since the nitriding treatment (gas soft nitriding treatment) frequently used for the surface hardening treatment of the driven side rotating body requires 90 to 150 minutes only by the nitriding treatment, the driven side rotating body, and thus the clutch device which is a finished product There was a problem of lowering the production efficiency.

SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and an object of the present invention is to manufacture a driven rotor for a clutch device that can maintain power transmission characteristics in the clutch device for a long period of time and can be efficiently produced. The present invention provides a method, a driven-side rotator, a clutch device including the driven-side rotator, and a method for manufacturing the clutch device .

In order to achieve the above object, a feature of the present invention according to claim 1 is that a driving side rotating body that rotates by driving a prime mover, and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material. A driven-side rotating body in a clutch device that transmits or cuts the driving force of a prime mover to or from a driven body connected to the driven-side rotating body, the ammonia heated to 720 ° C. or higher and 760 ° C. or lower and the nitrogen-containing layer forming step of forming a nitrogen-containing layer with no porous layer impregnated with nitrogen in the surface layer in the driven-side rotating body disposed driven rotating member in an atmosphere containing no free Mikatsu oxygen, nitrogen-containing layer A quenching process in which the nitrogen-containing layer is transformed into a martensite structure by rapidly cooling the driven-side rotating body in which the liquid is formed in the cooling liquid, and the driven-side rotating body taken out from the cooling liquid is dried in a drying furnace. While in that and a drying step to recover the toughness.

In this case, in the method for manufacturing the driven rotor, the nitrogen-containing layer forming step may be configured to infiltrate nitrogen at a concentration of 0.1 to 1.0% in the surface layer of the driven rotor. In this case, in the method for manufacturing the driven-side rotator, the nitrogen-containing layer forming step may form the nitrogen-containing layer at a depth of 20 to 50 μm from the surface of the driven-side rotator. In this case, in the method for manufacturing the driven-side rotator, the nitrogen-containing layer forming step may be performed by treating the driven-side rotator for 30 to 60 minutes in the atmosphere to form a nitrogen-containing layer. In this case, in the method for manufacturing the driven-side rotator, the drying step may be performed by processing the driven-side rotator at a temperature of about 140 ° C. In this case, the driven-side rotating body manufacturing method may further include a deep cooling process step of cooling the driven-side rotating body cooled to room temperature to 0 ° C. or lower after the quenching step.

According to the characteristic of the present invention according to claim 1 configured as described above, the clutch-side device that transmits or interrupts the driving force of the prime mover to the driven body is brought into contact with the driving side rotary body that is rotated by the driving of the prime mover via the friction material. In the driven side rotating body, a nitrogen-containing layer in which nitrogen is dissolved in a surface layer in contact with the friction material is formed by a martensite structure. In this case, according to the present inventor, no porous layer was confirmed on the surface of the nitrogen-containing layer formed on the surface layer of the driven rotor. For this reason, the contact surface of the driven-side rotator due to the driven-side rotator being in contact with the drive-side rotator for a long time is prevented from being mirror-finished. In this case, the nitrogen-containing layer is formed in 30 to 60 minutes. As a result, it is possible to suppress the time-dependent change in the friction characteristics between the driving-side rotating body and the driven-side rotating body, and to maintain the power transmission characteristics in the clutch device for a long period of time. Can efficiently produce a clutch device.

Furthermore, the present invention can be implemented not only as an invention of a manufacturing method of a driven side rotating body, but also of an invention of a driven side rotating body, an invention of a clutch device including the driven side rotating body, and a manufacturing method of the clutch device. It can also be implemented as an invention.

Specifically, as shown in claim 7, a drive-side rotator that rotates by driving the prime mover and a driven-side rotator that rotates by contacting the drive-side rotator via a friction material are provided. 7. The driven-side rotating body in the clutch device that transmits or interrupts the driving force of the prime mover to the driven body connected to the side rotating body, wherein the driven-side rotating body is any one of claims 1 to 6. It is good to manufacture using the manufacturing method of the driven side rotary body made.

In other words, a driving side rotating body that rotates by driving the prime mover, and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material, the driven body connected to the driven side rotating body is connected to the driving machine. In the driven-side rotating body in the clutch device that transmits or cuts the driving force of the driven-side rotating body, a nitrogen-containing layer in which nitrogen is dissolved in a surface layer that contacts the driving-side rotating body in the driven-side rotating body is formed with a martensite structure. May be. In this case, in the driven side rotating body, a nitrogen-containing layer is formed on the surface layer of the driven side rotating body by disposing the driven side rotating body in an atmosphere containing ammonia heated to 720 ° C. or higher and 760 ° C. or lower, It is preferable to transform the nitrogen-containing layer into a martensite structure by putting the driven-side rotor on which the containing layer is formed into a cooling liquid and quenching it.

According to another aspect of the present invention, there is provided a driving side rotating body that rotates by driving the prime mover, and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material. 7. A clutch device for transmitting or interrupting a driving force of a prime mover to a driven body connected to the driven body, wherein the driven side rotating body is a manufacture of the driven side rotating body according to any one of claims 1 to 6. It may be manufactured using a method.

According to a ninth aspect of the present invention, there is provided a driving side rotating body that rotates by driving the prime mover, and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material. A driven-side rotating body according to any one of claims 1 to 6, wherein the driven-side rotating body is a method for manufacturing a clutch device that transmits or interrupts the driving force of the prime mover to a driven body connected to the driven body. It is good to manufacture using this manufacturing method. Also by these, the same effect as the invention according to claim 1 can be expected.

In order to achieve the above-mentioned object, a drive-side rotator that rotates by driving the prime mover and a driven-side rotator that rotates by contacting the drive-side rotator via a friction material are provided. In the driven-side rotating body in the clutch device that transmits or cuts the driving force of the prime mover to the connected driven body, a nitrogen-containing layer in which nitrogen is dissolved in the surface layer in contact with the driving-side rotating body in the driven-side rotating body is martensite. It can also be formed by an organization.
  In this case, in the driven side rotating body, a nitrogen-containing layer is formed on the surface layer of the driven side rotating body by disposing the driven side rotating body in an atmosphere containing ammonia heated to 720 ° C. or higher and 760 ° C. or lower, It is preferable to transform the nitrogen-containing layer into a martensite structure by putting the driven-side rotor on which the containing layer is formed into a cooling liquid and quenching it.
  According to this, in the clutch device that transmits or cuts the driving force of the prime mover to the driven body, the driven rotational body that contacts the driving rotary body that rotates by driving the prime mover via the friction material contacts the friction material. A nitrogen-containing layer in which nitrogen is dissolved in the surface layer is formed by a martensite structure. In this case, according to the present inventor, no porous layer was confirmed on the surface of the nitrogen-containing layer formed on the surface layer of the driven rotor. For this reason, the contact surface of the driven-side rotator due to the driven-side rotator being in contact with the drive-side rotator for a long time is prevented from being mirror-finished. In this case, the nitrogen-containing layer is formed in 30 to 60 minutes. As a result, it is possible to suppress the time-dependent change in the friction characteristics between the driving-side rotating body and the driven-side rotating body, and to maintain the power transmission characteristics in the clutch device for a long period of time. Can efficiently produce a clutch device.
  A driving side rotating body that rotates by driving of the prime mover; and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material; the driven body coupled to the driven side rotating body; In the clutch device that transmits or cuts off the driving force, the driven-side rotator may include a nitrogen-containing layer in which nitrogen is dissolved in a surface layer that is in contact with the drive-side rotator in a martensite structure.
  In this case, in the clutch device, the driven-side rotating body has a nitrogen-containing layer on the surface layer of the driven-side rotating body by disposing the driven-side rotating body in an atmosphere containing ammonia heated to 720 ° C. or more and 760 ° C. or less. It is preferable to transform the nitrogen-containing layer into a martensite structure by rapidly cooling the driven rotor on which the nitrogen-containing layer is formed in the cooling liquid.
  A driving side rotating body that rotates by driving of the prime mover; and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material; the driven body coupled to the driven side rotating body; A method for manufacturing a driven-side rotator in a clutch device that transmits or interrupts the driving force of the driven-side rotator by disposing the driven-side rotator in an atmosphere containing ammonia heated to 720 ° C. or higher and 760 ° C. or lower. A nitrogen-containing layer forming step for forming a nitrogen-containing layer on the surface layer in the step, and a quenching step for transforming the nitrogen-containing layer into a martensite structure by rapidly cooling the driven rotor on which the nitrogen-containing layer is formed in the cooling liquid. Can be included.
  A driving side rotating body that rotates by driving of the prime mover; and a driven side rotating body that rotates by contacting the driving side rotating body via a friction material; the driven body coupled to the driven side rotating body; Manufacturing method of a clutch device for transmitting or interrupting the driving force of the motor, wherein the driven side rotating body is arranged in an atmosphere containing ammonia heated to 720 ° C. or higher and 760 ° C. or lower, and the surface layer of the driven side rotating body contains nitrogen It is preferable to include a nitrogen-containing layer forming step for forming a layer and a quenching step for transforming the nitrogen-containing layer into a martensite structure by rapidly cooling the driven rotor on which the nitrogen-containing layer is formed in a cooling liquid. .
  Also by these, the same effect as the invention according to claim 1 can be expected.

  Hereinafter, an embodiment of a driven-side rotator according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an overall configuration of a clutch device 10 including a clutch plate 17 as a driven side rotating body according to the present invention. The clutch device 10 is a mechanical device for transmitting or blocking a driving force of an engine (not shown) as a prime mover in a two-wheeled vehicle (motorcycle) to a wheel (not shown) as a driven body. It arrange | positions between transmissions (transmission) (not shown). The clutch device 10 is a so-called wet multi-plate clutch device that transmits driving force in a state where a large number of clutch plates 17 are immersed in oil filled in the clutch device 10.

(Configuration of clutch device)
The clutch device 10 includes a housing 11. The housing 11 is formed in a bottomed cylindrical shape, and is a member that constitutes a part of the casing of the clutch device 10. An input gear 12 is fixed to the outer surface of the bottom of the housing 11 by a rivet 12b via a torque damper 12a. The input gear 12 is rotationally driven in mesh with a drive gear (not shown) that is rotationally driven by driving of the engine. A plurality (six in this embodiment) of drive plates 13 can be displaced along the axial direction of the housing 11 and can be rotated together with the housing 11 by spline fitting on the inner peripheral surface of the housing 11. Each is held.

  As shown in detail in FIG. 2, the drive plate 13 is configured by forming a thin plate material in a substantially ring shape. On both side surfaces of the drive plate 13, substantially rectangular friction materials 13a are fixed at equal intervals along the circumferential direction. The friction material 13a improves the frictional force against the clutch plate 17, which will be described later, and is made of a paper material. In addition, if the friction material 13a is comprised with the material which can improve the frictional force of the drive plate 13 and the clutch plate 17, materials other than paper materials, for example, a cork material, a rubber material, or a glass material etc. will be used. It can also be used. The drive plate 13 corresponds to a drive side rotator according to the present invention. In FIG. 2, two drive plates 13 are shown.

  A clutch plate holder 14 formed in a substantially cylindrical shape is disposed concentrically with the housing 11 inside the housing 11. A number of spline grooves are formed in the clutch plate holder 14 along the axial direction of the clutch plate holder 14 on the inner peripheral surface, and a shaft 15 is spline-fitted with the spline grooves. The shaft 15 is a shaft body formed in a hollow shape, and rotatably supports the input gear 12 and the housing 11 via a needle bearing 15a on one end side (the right side in the figure), and engages with the spline. The clutch plate holder 14 is fixedly supported by the nut 15b. That is, the clutch plate holder 14 rotates integrally with the shaft 15. On the other hand, the other end (left side in the figure) of the shaft 15 is connected to a transmission in a two-wheeled vehicle.

  In the hollow portion of the shaft 15, an axial push rod 16 is disposed so as to protrude from the one end (right side in the drawing) of the shaft 15. The push rod 16 is connected to a clutch operating lever (not shown) in the two-wheeled vehicle on the opposite side of the end protruding from one end (right side in the drawing) of the shaft 15, and the inside of the hollow portion of the shaft 15 is operated by the operation of the clutch operating lever. Is slid along the axial direction of the shaft 15.

  On the outer peripheral surface of the clutch plate holder 14, a plurality (seven in this embodiment) of clutch plates 17 are arranged along the axial direction of the clutch plate holder 14 with the drive plates 13 held by the housing 11 being sandwiched therebetween. And are held by spline fitting so as to be able to rotate integrally with the clutch plate holder 14.

  As shown in detail in FIG. 2, the clutch plate 17 is configured by forming a thin plate material made of a SPCC (cold rolled steel plate) material into a substantially ring shape. On both side surfaces (front and back surfaces) of the clutch plate 17 facing the drive plate 13 (friction material 13a), a depth of several μm to several tens μm for holding oil for immersing the clutch plate 17 is not shown. An oil groove is formed. Further, each side surface (front and back surfaces) of the clutch plate 17 where the oil grooves are formed is subjected to surface hardening treatment. This surface hardening process will be described later. In FIG. 2, two clutch plates 17 are shown.

  In addition, a plurality of cylindrical support pillars 14a are formed inside the clutch plate holder 14 so as to protrude outward in the axial direction (right side in the figure) of the clutch plate holder 14 (only one is shown in the figure). Yes. A press cover 19 disposed concentrically with the clutch plate holder 14 is assembled to these cylindrical support columns 14a via bolts 18a, receiving plates 18b, and coil springs 18c. The pressing cover 19 is formed in a substantially disc shape having an outer diameter substantially the same as the outer diameter of the clutch plate 17 and is pressed toward the clutch plate holder 14 by the coil spring 18c.

  In addition, a relay bearing 19a is provided at the inner center portion of the pressing cover 19 at a position facing the right end portion of the push rod 17 in the figure. That is, the pressing cover 19 presses the drive plate 13 by the elastic force of the coil spring 18c when the push rod 17 is retracted and the tip of the push rod 17 is not pressing the relays bearing 19a. Therefore, the drive plate 13 and the clutch plate 17 are pressed against each other while being displaced toward the receiving portion 14b formed in a flange shape on the outer peripheral surface of the clutch plate holder 14, and are in a frictionally connected state. Thereby, the driving force of the engine transmitted to the input gear 12 is transmitted to the transmission via the drive plate 13, the clutch plate 17 and the shaft 15.

  On the other hand, in a state where the push rod 17 moves forward and the push rod 17 presses the relay bearing 19a, the press cover 19 is displaced to the right in the figure while resisting the elastic force of the coil spring 18c, and the press cover 19 and the drive plate 13 Are separated. For this reason, the drive plate 13 and the clutch plate 17 are pressed against each other while being displaced toward the pressing cover 19, and the connected state is released and separated from each other. Thereby, transmission of the driving force from the driving plate 13 to the clutch plate 17 is not performed, and transmission of the driving force of the engine transmitted to the input gear 12 to the transmission is interrupted.

(Manufacturing method of clutch plate)
Next, a manufacturing method including the surface hardening process of the clutch plate 17 in the clutch device 10 configured as described above will be described with reference to FIG. An operator who manufactures the clutch plate 17 first forms the clutch plate 17 as a first step. Specifically, the operator punches out the shape of the clutch plate 17 (plate thickness of about 2.3 mm) from the plate-like SPCC material using a press machine (not shown). Then, the operator performs deburring of the punched clutch plate 17 and correction of planar accuracy, and then processes the oil groove. Specifically, the operator forms a groove by grinding the front surface (front and back surfaces) of the clutch plate 17 by belt polishing using a polishing belt having a lapping (polishing) surface.

  Next, the operator performs a surface hardening process on the clutch plate 17. The surface hardening treatment of the clutch plate 17 includes a second step in which nitrogen is mainly dissolved on the surface of the clutch plate 17 to form a nitrogen-containing layer, and a third step in which the clutch plate 17 in which nitrogen is dissolved is quenched. It is composed of Of these, the second step of forming a nitrogen-containing layer by solidly dissolving nitrogen on the surface of the clutch plate 17 is performed using a heat treatment furnace (not shown). First, the operator cleans the clutch plate 17 to be treated to remove the deposits, and then accommodates the clutch plate 17 in a heat treatment furnace with an appropriate interval.

Next, the operator removes the air in the heat treatment furnace by evacuation. This is performed in order to exclude gas components (mainly oxygen) that affect the formation of the nitrogen-containing layer on the clutch plate 17 from the heat treatment furnace . Next, the operator introduces an inert gas (for example, nitrogen gas or hydrogen gas) that does not affect the formation of the nitrogen-containing layer to the clutch plate 17 into the heat treatment furnace so that the atmospheric pressure in the heat treatment furnace is maintained. Return to pressure. Then, the operator heats the temperature in the heat treatment furnace to the heat treatment temperature of the clutch plate 17. Specifically, the worker heats the temperature in the heat treatment furnace to about 740 ° C.

  Next, an operator introduce | transduces ammonia gas in the heat processing furnace heated at about 740 degreeC. In this case, the flow rate of the ammonia gas introduced into the heat treatment furnace is set to a flow rate necessary for dissolving nitrogen in the surface of the clutch plate 17 at a concentration of about 0.1 to 1.0%. In the present embodiment, the operator introduces ammonia gas into the heat treatment furnace at a flow rate of 1 l / min. The ammonia gas introduced into the heat treatment furnace is immediately pyrolyzed to generate nitrogen. The generated nitrogen starts to dissolve from the surface of the clutch plate 17. The operator maintains the temperature in the heat treatment furnace at about 740 ° C., and causes the ammonia gas concentration in the heat treatment furnace to dissolve nitrogen at a concentration of about 0.1 to 1.0% on the surface of the clutch plate 17. Keep at the required concentration. As a result, nitrogen sequentially permeates the surface layer of the clutch plate 17 to form a nitrogen-containing layer.

In this case, the time required for nitrogen to penetrate into the surface layer of the clutch plate 17 to form the nitrogen-containing layer corresponds to the depth at which nitrogen is desired to be dissolved. In the present embodiment, it takes about 30 minutes to form a nitrogen-containing layer in which nitrogen is dissolved from the surface of the clutch plate 17 to a depth of about 20 to 50 μm. In the surface layer of the clutch plate 17 to the nitrogen-containing layer is formed is reduced to the A ₁ transformation (eutectoid transformation) around the point of about 600 ° C. in a steel according to the nitrogen-containing concentration by nitrogen have infiltrated . For this reason, the nitrogen-containing layer of the clutch plate 17 in the heat treatment furnace maintained at a temperature of about 740 ° C. changes to an austenite structure. On the other hand, the inner layer of the clutch plate 17 than the nitrogen-containing layer maintains a ferrite structure because nitrogen does not permeate sufficiently.

  Further, in this case, the nitrogen concentration in the heat treatment furnace for infiltrating nitrogen into the surface of the clutch plate 17 is 1/10 or less as compared with the nitrogen concentration in the conventional nitriding treatment of the clutch plate 17. Therefore, a nitride compound layer combined with nitrogen is not formed on the surface layer of the clutch plate 17 in which nitrogen has penetrated.

Next, the operator quenches the clutch plate 17 as a third step. Specifically, the operator removes the clutch plate 17 formed with the nitrogen-containing layer from the heat treatment furnace and immediately puts it in the cooling oil by allowing a certain time (about 30 minutes in the present embodiment) to elapse in the heat treatment furnace. throw into. In this case, the temperature of the cooling oil to which the clutch plate 17 is put is set to about 85 ° C. in the present embodiment. Thereby, the austenite structure of the nitrogen-containing layer formed on the surface layer of the clutch plate 17 is transformed into a martensite structure by martensite transformation by rapid cooling. In this hardening of the clutch plate 17, the clutch plate 17 to be introduced into the cooling oil, the distortion at the time of quenching for being transformed into austenitic structure at about 740 ° C. by reduction of A ₁ transformation point due to penetration of the nitrogen generator It is possible to increase the surface hardness while suppressing.

  Next, as a fourth step, the operator takes out the quenched clutch plate 17 from the cooling oil and removes the oil adhering to the surface of the clutch plate 17 to dry it. In this case, the temperature of the clutch plate 17 when taking out from the cooling oil is suitably about 150 ° C. or less. Thereby, the clutch plate 17 which performed the surface hardening process is completed. The clutch plate 17 taken out from the cooling oil is dried in a drying furnace at about 140 ° C., so that the clutch plate 17 can be quickly dried and the clutch plate 17 (more specifically, a nitrogen-containing layer). A so-called tempering effect for restoring toughness can be provided. In addition, after cooling the quenched clutch plate 17 to room temperature, a so-called deep-cooling process (sub-zero process) is performed in which the quenched clutch plate 17 is cooled to 0 ° C. or less, thereby causing the transformation of residual austenite in the nitrogen-containing layer to progress and stabilize the structure. And the surface hardness of the nitrogen-containing layer can be increased by about 20 to 100 HV.

  The clutch plate 17 completed through the above steps is incorporated into the clutch device 10 through the same steps as those of the conventional clutch plate. Since the step of incorporating the clutch plate 17 into the clutch device 10 is not related to the present invention, the description thereof is omitted.

  According to the analysis of the clutch plate 17 manufactured in this way by using the electron microscope, the surface of the nitride compound layer is conventionally obtained by performing nitriding treatment (gas soft nitriding treatment) on the clutch plate 17. It was confirmed that the formed porous layer was not formed on the surface of the nitrogen-containing layer of the clutch plate 17 manufactured according to this embodiment. Thereby, the contact surface with the friction material 13a in the clutch plate 17 due to brittle fracture of the porous layer does not occur. In particular, in the clutch plate 17 having an oil groove, since a porous layer that has been brittlely broken does not enter the oil groove, it is possible to prevent mirroring due to the disappearance of the oil groove. Thereby, durability of the clutch plate 17 improves and the power transmission characteristic of the clutch apparatus 10 can be maintained over a long period of time.

  Further, the surface hardness of the nitrogen-containing layer of the clutch plate 17 manufactured according to the present embodiment is about 800 to 900 HV, compared with the surface hardness (about 500 to 600 HV) of the clutch plate 17 by the conventional technique (gas nitriding treatment). hard. Thereby, durability of the clutch plate 17 improves and the power transmission characteristic of the clutch apparatus 10 can be maintained over a long period of time. Furthermore, the time required for forming the nitrogen-containing layer on the surface layer of the clutch plate 17 in this embodiment is about 30 minutes, and the surface layer of the clutch plate 17 similar to that of this embodiment is obtained by the conventional technique (gas nitriding treatment). The time required for forming the nitride compound layer is extremely short compared to the time required for forming the nitride compound layer (about 120 minutes). Thereby, the clutch plate 17 and by extension, the clutch apparatus 10 can be manufactured economically and efficiently.

  As can be understood from the above description of the manufacturing process, according to the above-described embodiment, the clutch device 10 that transmits or cuts the driving force of the engine to the wheels is connected to the driving side plate 13 that rotates by driving the engine via the friction material 13a. In the contacting clutch plate 17, a nitrogen-containing layer in which nitrogen is dissolved is formed in a martensite structure in a surface layer portion in contact with the friction material 13a. In this case, according to the present inventors, no porous layer was confirmed on the surface of the nitrogen-containing layer formed on the surface layer portion of the clutch plate 17. Therefore, the contact surface of the clutch plate 17 is prevented from being mirror-finished due to the clutch plate 17 being in contact with the drive side plate 13 for a long time. In this case, the nitrogen-containing layer is formed in 30 to 60 minutes. As a result, it is possible to suppress a change with time in the friction characteristics between the drive side plate 13 and the clutch plate 17 and to maintain the power transmission characteristics in the clutch device 10 for a long period of time. The clutch device 10 can be produced efficiently.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above embodiment, an SPCC material is used as a material constituting the clutch plate 17. However, the material constituting the clutch plate 17 is a material that can permeate nitrogen and can be quenched, that is, a material other than the SPCC material as long as it is a steel material containing carbon. . Also by this, the same effect as the above-mentioned embodiment can be expected.

  In the above embodiment, in order to form a nitrogen-containing layer on the surface layer of the clutch plate 17, ammonia gas is introduced into the heat treatment furnace at a flow rate of 1 l / min. However, the flow rate of the ammonia gas introduced into the heat treatment furnace allows nitrogen to penetrate into the surface of the clutch plate 17 at a concentration of about 0.1 to 1.0% depending on the temperature of the heat treatment furnace and the shape of the clutch plate 17. The flow rate required for the flow rate is specifically set within a range of about 0.5 to 5 l / min. In this case, according to the experiment of the present inventor, a sufficient surface can be obtained without forming a porous layer in the prior art by allowing nitrogen to penetrate the surface of the clutch plate 17 at a concentration of about 0.1 to 1.0%. A nitrogen-containing layer having hardness can be formed. Therefore, the flow rate of the ammonia gas introduced into the heat treatment furnace may be appropriately set to a flow rate necessary for permeating nitrogen at a concentration of about 0.1 to 1.0% on the surface of the clutch plate 17. In this case, the temperature of the heat treatment furnace is preferably 720 ° C. or more and 760 ° C. or less. According to this, the same effect as the above-described embodiment can be expected.

  Moreover, in the said embodiment, nitrogen was dissolved to the depth of about 20-50 micrometers from the surface of the clutch plate 17, and the nitrogen containing layer was formed. The thickness of the nitrogen-containing layer can be controlled by the temperature in the heat treatment furnace, the concentration of ammonia gas introduced into the heat treatment furnace, and the indwelling time of the clutch plate 17 in the heat treatment furnace. According to the present inventors, it is considered that a practically suitable clutch plate can be obtained as a clutch plate used in the clutch device by forming the thickness of the nitrogen-containing layer in the range of about 20 to 50 μm.

  Moreover, in the said embodiment, oil was used for hardening of the clutch plate 17 in which the nitrogen containing layer was formed. However, the coolant used for quenching the clutch plate 17 does not necessarily need to be oil, and other liquids other than oil, such as water, may be used. In this case, the temperature of the coolant is appropriately set according to the type of coolant. For example, when oil is used as the coolant, 70 to 90 ° C. is suitable, whereas when water is used as the coolant, 60 ° C. or less is suitable. In addition, it is desirable to use a coolant for quenching the clutch plate 17. According to the present inventor, in order to prevent the formation of a porous layer on the surface of the nitrogen-containing layer formed on the surface layer of the clutch plate 17, it is necessary to form and quench the nitrogen-containing layer in a state where it is not exposed to oxygen as much as possible. This is because there is thought to be.

  Moreover, in the said embodiment, this invention was applied to the clutch plate 17 in the clutch apparatus 10 which is what is called a wet multi-plate clutch apparatus. However, the present invention can be widely applied to a driven-side rotating body that comes into contact with a driving-side rotating body that rotates by driving of the prime mover via a friction material in a clutch device that transmits or interrupts the driving force of the prime mover to the driven body. The wet multi-plate clutch device according to the above embodiment is not limited. For example, a driven-side rotating body in a so-called centrifugal clutch device (for example, an inner circumference of a bottomed cylindrical body) in which driving force is transmitted by the driving-side rotating body coming into contact with the driven-side rotating body due to an increase in the rotational speed of the prime mover. The present invention can also be applied to a clutch outer configured such that the drive-side rotating body contacts the surface. Further, the present invention can also be applied to a so-called dry clutch device in which the driving-side rotator and the driven-side rotator in the clutch device are arranged in the air without being immersed in oil. In these cases, the numbers of drive-side rotators and driven-side rotators included in each clutch device are not necessarily limited to the above-described embodiments. For example, the drive-side rotator and the driven-side rotator are each 1 You may be comprised by the sheet. According to this, the same effect as the above-described embodiment can be expected. In the above embodiment, an engine (internal combustion engine) is used as a prime mover, but the engine is not necessarily required. For example, an electric motor (motor) may be used.

It is sectional drawing which shows the whole structure of a clutch apparatus provided with the clutch plate which concerns on one Embodiment of this invention. It is a perspective view which shows the drive plate assembled | attached to the clutch apparatus shown in FIG. 1, and the clutch plate which concerns on this invention. It is the process flowchart which showed the process of manufacturing the clutch plate which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Clutch apparatus, 11 ... Housing, 12 ... Input gear, 12a ... Torque damper, 13 ... Drive plate, 13a ... Friction material, 14 ... Clutch plate holder, 14a ... Cylindrical support pillar, 14b ... Receiving part, 15 ... Shaft, 15a ... Needle bearing, 15b ... Nut, 16 ... Push rod, 17 ... Clutch plate, 18a ... Bolt, 18b ... Receiving plate, 18c ... Coil spring, 19 ... Press cover, 19a ... Relays bearing.

Claims (9)

A driving side rotating body that rotates by driving a prime mover;
In a clutch device, comprising: a driven-side rotating body that rotates by contacting the driving-side rotating body via a friction material; and transmitting or interrupting a driving force of the prime mover to a driven body connected to the driven-side rotating body A method of manufacturing the driven side rotating body,
Nitrogen containing no porous layer impregnated with nitrogen in the surface layer at 720 ° C. or higher and 760 ° C. by placing the driven-side rotating member to heat ammonia in the atmosphere containing no free Mikatsu oxygen below the driven side rotational member and the nitrogen-containing layer forming step of forming the layer,
A quenching step of transforming the nitrogen-containing layer into a martensite structure by rapidly cooling the driven rotor on which the nitrogen-containing layer is formed in a cooling liquid;
And a drying step of recovering toughness while drying the driven-side rotating body taken out from the coolant in a drying furnace. In the manufacturing method of the driven side rotary body described in Claim 1,
The nitrogen-containing layer forming step, the manufacturing method of the driven-side rotating member, wherein Rukoto nitrogen is permeated with 0.1% to 1.0% of the concentration in the surface layer of the driven side rotational member. In the manufacturing method of the driven side rotary body described in Claim 1 or Claim 2,
The nitrogen-containing layer forming step includes forming the nitrogen-containing layer at a depth of 20 to 50 μm from the surface of the driven-side rotating body.

In the manufacturing method of the driven side rotary body as described in any one of Claims 1 thru | or 3,
The said nitrogen containing layer formation process processes the said driven side rotary body in the said atmosphere for 30 to 60 minutes, and forms the said nitrogen containing layer, The manufacturing method of the driven side rotary body characterized by the above-mentioned. In the manufacturing method of the driven side rotary body as described in any one of Claims 1 thru | or 4,
The said drying process processes the said driven side rotary body at the temperature of about 140 degreeC, The manufacturing method of the driven side rotary body characterized by the above-mentioned. In the manufacturing method of the driven side rotating body according to any one of claims 1 to 5,
After the quenching step, the method further includes a deep cooling process step of cooling the driven side rotating body cooled to room temperature to 0 ° C. or lower. A driving side rotating body that rotates by driving a prime mover;
In a clutch device, comprising: a driven-side rotating body that rotates by contacting the driving-side rotating body via a friction material; and transmitting or interrupting a driving force of the prime mover to a driven body connected to the driven-side rotating body In the driven side rotating body,
The driven-side rotator is manufactured using the method for manufacturing a driven-side rotator described in any one of claims 1 to 6. A driving side rotating body that rotates by driving a prime mover;
A clutch device for transmitting or interrupting the driving force of the prime mover to a driven body connected to the driven side rotating body, the driven side rotating body rotating by contacting the driving side rotating body via a friction material; ,
7. The clutch device according to claim 1, wherein the driven-side rotator is manufactured by using the driven-side rotator manufacturing method according to any one of claims 1 to 6. A driving side rotating body that rotates by driving a prime mover;
A clutch device that transmits or cuts off the driving force of the prime mover to a driven body connected to the driven-side rotating body. In the manufacturing method,
The method for manufacturing a clutch device, wherein the driven side rotating body is manufactured using the method for manufacturing a driven side rotating body according to any one of claims 1 to 6.

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