JP4128926B2 - Method for manufacturing movable flange of pulley for continuously variable transmission - Google Patents

Description

  The present invention relates to a method for manufacturing a movable flange constituting a pulley used in a continuously variable transmission such as an automobile.

  As shown in FIG. 3, a continuously variable transmission 21 such as an automobile includes a driving pulley 22, a driven pulley 23, and an endless metal belt 24 wound between the pulleys 22 and 23. ing.

  The driving pulley 22 includes a stationary flange 26 fixed to the rotating shaft 25 and a movable flange 27 that can reciprocate along the axial direction of the rotating shaft 25. The movable flange 27 is attached to the rotating shaft 25 through an insertion hole 28a formed in the cylindrical sliding member 28, and is slidable along the axial direction of the rotating shaft 25. It is designed to rotate together. The flanges 26 and 27 include inclined flange surfaces 26a and 27a on opposite surfaces, and the endless metal belt 24 is disposed between the flange surfaces 26a and 27a.

  The movable flange 27 includes a cylinder portion 29 provided in a cylindrical shape along the outer peripheral edge on the side opposite to the flange surface 27a. The cylinder part 29 is slidably accommodated in a cylindrical partition wall 30 attached to a bearing part 25 a of the rotating shaft 25, and a pressure chamber 31 is formed by the cylinder part 29 and the partition wall 30. The movable flange 27 is capable of reciprocating along the axial direction of the rotary shaft 25 by pressure such as hydraulic pressure applied to the pressure chamber 31.

  On the other hand, the driven pulley 23 includes a stationary flange 33 fixed to the rotating shaft 32 and a movable flange 34 that can reciprocate along the axial direction of the rotating shaft 32. The movable flange 34 is attached to the rotary shaft 32 through an insertion hole 35a drilled in a cylindrical sliding member 35, and is slidable along the axial direction of the rotary shaft 32. It is designed to rotate together. The flanges 33 and 34 include inclined flange surfaces 33a and 34a on opposite surfaces, and the endless metal belt 24 is disposed between the flange surfaces 33a and 34a. The movable flange 34 of the driven pulley 23 is urged by a coil spring 36 or the like and is pressed toward the stationary flange 33.

  In the continuously variable transmission 21 having the above-described configuration, the movable flange 27 is moved along the axial direction of the rotary shaft 25 by changing the pressure applied to the pressure chamber 31 when changing the gear ratio. In this way, the distance between the flange surfaces 26a, 27a of the drive side pulley 22 is changed, and accordingly, the winding position of the endless metal belt 24 is changed to the diameter of the drive side pulley 22 along the flange surfaces 26a, 27a. Move in direction. Further, in the driven pulley 23, the interval between the flange surfaces 33a, 34a is changed with the change in the interval between the flange surfaces 26a, 27a of the drive pulley 22, and the winding position of the endless metal belt 24 is set to the flange surface 33a. , 34a along the diameter direction of the driven pulley 23. As a result, the continuously variable transmission 21 can change the gear ratio steplessly.

  In the continuously variable transmission 21, the endless metal belt 24 slides along the flange surfaces 26 a and 27 a in the driving pulley 22 and along the flange surfaces 33 a and 34 a in the driven pulley 23 due to the change in the gear ratio. Therefore, it is necessary to increase the hardness of at least the flange surfaces 26a, 27a, 33a, and 34a. Usually, the hardness is increased by carburizing and quenching the flanges 26, 27, 33, and 34. .

  By the way, in the movable flange 27 of the driving pulley 22, the cylinder part 29 can also be formed by fitting a separately manufactured cylindrical member to the outer peripheral edge of the movable flange 27. However, if it does in this way, the fitting part of the said cylindrical member and the movable flange 27 must be thickened, and a weight increase cannot be avoided. Further, in order to combine the cylindrical member and the movable flange 27, it is necessary to process both with high accuracy, and an increase in manufacturing cost is inevitable.

  Therefore, conventionally, a technique for forming the cylinder portion 29 integrally with the movable flange 27 has been proposed. As the technique, for example, first, a movable flange material having a rough shape of the movable flange 27 and an annular preliminary shape portion for forming the cylinder portion 29 is formed on the outer peripheral edge, and then the movable flange material is carburized. A technique is known in which the cylinder portion 29 is formed by performing hardening to increase the hardness and then spinning the preliminary shape portion into a cylindrical shape (see, for example, Patent Document 1).

However, the movable flange 27 includes a sliding member 28 extending on the opposite side of the flange surface 27a, and the sliding member 28 protrudes on the opposite side of the flange surface 27a. Accordingly, when a plurality of movable flange materials are to be accommodated in the carburizing furnace when carburizing and quenching is performed, the movable flange material itself is bulky due to the protruding sliding member 28, and it is difficult to accommodate the materials closely. There is.
JP 2000-310305 A

  An object of the present invention is to provide a method for manufacturing a movable flange of a pulley for a continuously variable transmission, which can eliminate such disadvantages and efficiently perform carburizing and quenching of the movable flange material.

In order to achieve such an object, the present invention is formed on one surface of a shaft hole through which a rotating shaft is inserted and a disk-like body that has been subjected to carburizing and quenching treatment extending in the outer circumferential direction of the shaft hole. A carburizing and quenching process is provided which includes a flange surface and a hole portion having the same inner diameter as the shaft hole, extends to the opposite side to the flange surface of the disk-like body, and slides along the axial direction of the rotating shaft. a cylindrical slide member which is pressure to reciprocate the flange surface opposite integrally provided with the disc-shaped body side the disc-like body of the disc-shaped body in the axial direction of the rotary shaft In a manufacturing method of a movable flange of a continuously variable transmission pulley comprising a cylinder portion forming a chamber, the cylinder portion is formed on the shaft hole, the flange surface , and a surface opposite to the flange surface . a pre-shaped portion, a disk-shaped body and a bottom portion formed on the inner peripheral side of the pre-shaped portion Applying a step of forming by hot forging, and the flange surface and the pre-shaped portion formed on the opposite side and bottom portions of the disc-like body, the carburizing agent and one end surface of said sliding member A step of carburizing and quenching the disk-shaped body provided with the preliminary-shaped portion coated with the carburizing agent, and the sliding member coated with the carburizing agent, and the carburizing and quenching process. The carburizing agent is removed from the disk-shaped body and the sliding member applied, and the sliding member is disposed on the surface of the disk-shaped body on the opposite side to the flange surface. Comprises a step of friction welding so that the shaft hole of the disk-like body and the inner peripheral surfaces thereof coincide with each other.

  In the manufacturing method of the present invention, first, a disk-like body including the shaft hole, the flange surface, and a preliminary shape portion for forming the cylinder portion is formed as the flange material by hot forging. Then, after carburizing and quenching the disc-like body as the flange material and the sliding member, the sliding member is placed on the surface opposite to the flange surface of the disc-like body. Friction welding is performed so that the hole portion of the member and the shaft hole of the disk-like body coincide with each other.

  Therefore, according to the manufacturing method of the present invention, at the stage of the carburizing and quenching treatment, the disk-shaped body and the sliding member are separated, and a plurality of the disk-shaped body and the sliding member are combined. It can be densely accommodated in a carburizing furnace, and the carburizing and quenching process can be performed efficiently.

  By the way, since the hardness of the disk-shaped body and the sliding member that have been subjected to the carburizing and quenching treatment as described above is increased, there is a concern that the joining by friction welding becomes poor. Therefore, in the manufacturing method of the present invention, after applying a carburizing agent to the surface opposite to the flange surface of the disk-like body to be subjected to friction welding and one end surface of the sliding member, The carburizing and quenching process is performed on the shaped body and the sliding member. Then, after removing the carburizing agent from the disk-shaped body and the sliding member subjected to the carburizing and quenching treatment, on the surface of the disk-shaped body opposite to the flange surface, The end surfaces from which the carburizing agent has been removed are joined by friction welding.

  When doing so, in the disk-like body and the sliding member, the portion that is subject to friction welding is protected by the carburizing agent, and carburization does not occur even if the carburizing and quenching treatment is performed, and the hardness Escape the rise. Therefore, the disk-shaped body and the sliding member can be favorably joined by the friction welding.

  In the manufacturing method of the present invention, the cylinder part may be formed by subjecting the sliding member to friction welding to a surface opposite to the flange surface of the disk-like body and then spinning the preliminary shape part. Further, after the preliminary shape portion is subjected to spinning processing to form the cylinder portion, the friction welding may be performed.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory cross-sectional view showing the steps of the manufacturing method of the present embodiment, and FIG. 2 is an explanatory cross-sectional view showing the configuration of the movable flange obtained by the manufacturing method of the present embodiment.

  In the manufacturing method of the present embodiment, first, a material such as case-hardened steel having a predetermined composition is hot forged to form the flange material 1 shown in FIG. At the same time, a cylindrical sliding member 2 made of the material is formed.

  The case-hardened steel can obtain a desired hardness by the carburizing and quenching process described later, and 0.15 to 0.20% by weight of carbon and 0.35 manganese to prevent cracking and the like by the spinning process described later. -0.81% by weight, silicon 0.05-0.15% by weight, phosphorus 0.015% by weight, sulfur 0.02% by weight, titanium 0.03-0.2% by weight, the balance being iron The carbon equivalent is preferably in the range of 0.44 to 0.54, and further preferably 0.001 to 0.002% by weight of boron.

  In the case-hardened steel, if the carbon content is less than 0.15% by weight, the desired hardness may not be obtained, and if it exceeds 0.20% by weight, the hardness becomes excessive and the steel is easily cracked. Further, if the manganese content is less than 0.35% by weight, sufficient hardness may not be obtained by carburizing and quenching treatment, and if it exceeds 0.81% by weight, inclusions such as MnS are formed and cracks easily occur. Further, if the silicon content is less than 0.05% by weight, the effect of strengthening the ferrite phase and increasing the tempering resistance may not be obtained. If the silicon content exceeds 0.15% by weight, inclusions such as SiS may be obtained. It becomes easy to crack. On the other hand, if the phosphorus content exceeds 0.015% by weight, it combines with manganese or the like to form inclusions and easily break. On the other hand, when the sulfur content exceeds 0.02% by weight, it combines with manganese, silicon and the like to form inclusions and easily break. Further, if the titanium content is less than 0.03% by weight, the effect of refining crystal grains may not be obtained, and if it exceeds 0.2% by weight, carbon may be fixed and age hardening may not be obtained. is there. Further, if the boron content is less than 0.001% by weight, the effect of refining the crystal grains may not be obtained, and if it exceeds 0.002% by weight, the crystal grains become large and are liable to crack.

  As case hardening steel having the above composition, for example, TMAXJ1B (trade name), TMAXJ2B (trade name) manufactured by Sanyo Special Steel Co., Ltd., ALFA steel (trade name) manufactured by Daido Special Steel Co., Ltd., Super-ALFA steel (trade name), etc. Can be mentioned.

  The flange material 1 has a flange surface 5 inclined from the outer peripheral edge toward the shaft hole 3 on one surface of a disk-like body 4 extending in the outer peripheral direction of the shaft hole 3 through which the rotation shaft is inserted. The preliminary shape part 6 for cylinder part formation is provided in the opposite side to the flange surface 5 of the disk-shaped body 4. The preliminary shape portion 6 has a thick cylindrical shape, and a bottom surface portion 7 is formed on the inner peripheral side thereof. After the hot forging, the flange material 1 is polished on the flange surface 5 and the bottom surface portion 7 on the opposite side. However, since the sliding member 2 is not joined to the bottom surface portion 7, it can be easily polished. it can.

  On the other hand, the sliding member 2 is provided with a hole portion 8 having the same inner diameter as the shaft hole 3 of the flange material 1 in the center portion, and polishes one end portion to reduce the diameter from the outer peripheral edge toward the hole portion 8. Thus, the boss 9 is formed.

  Next, in the manufacturing method of this embodiment, a carburizing agent is apply | coated to the preliminary shape part 6 and the bottom face part 7 of the flange raw material 1, and the end surface in which the boss | hub 9 of the sliding member 2 is formed. A commercially available product can be used as the carbon-proofing agent and is not particularly limited.

  And the flange raw material 1 and the sliding member 2 to which the said carburizing agent was apply | coated are accommodated in the carburizing furnace which is not shown in figure, and a carburizing quenching process is performed. At this time, the flange material 1 does not protrude to the opposite side of the flange surface 5 because the sliding member 2 is not joined to the bottom surface portion 7. Therefore, the plurality of flange materials 1 and the sliding member 2 can be densely accommodated in the carburizing furnace, and the carburizing and quenching process can be performed efficiently. The carburizing and quenching treatment can be performed according to a method known per se, and the hardness of the flange material 1 and the sliding member 2 where the carburizing agent is not applied can be improved.

  When the carburizing and quenching process is completed, after removing the carburizing agent, the flange material 1 is mounted on a spinning machine (not shown). On the other hand, the sliding member 2 has the boss 9 opposed to the bottom surface portion 7 of the flange material 1 and the hole 8 is the shaft of the flange material 1 as shown in FIG. It is mounted on a friction welding apparatus (not shown) so as to be coaxial with the hole 3.

  Then, while the sliding member 2 is rotated at a high speed by the friction welding apparatus, the boss 9 is pressed against the bottom surface portion 7 of the flange material 1 while being moved in the direction of the flange material 1. If it does in this way, the boss | hub 9 of the sliding member 2 and the bottom face part 7 of the flange raw material 1 will fuse | melt by the heat of friction, and will be joined mutually. At this time, since the sliding member 2 is arranged so that the hole 8 is coaxial with the shaft hole 3 of the flange material 1, the inner peripheral surfaces of the hole 8 and the shaft hole 3 coincide with each other. As a result, as shown in FIG. 1C, the flange material 1 in which the sliding member 2 is joined to the bottom surface portion 7 is obtained.

  Next, in the manufacturing method of the present embodiment, the preliminary shape portion 6 of the flange material 1 is subjected to spinning processing. As a result, as shown in FIG. 2, the sliding member 2 is joined to the bottom surface portion 7 on the side opposite to the flange surface 5, and the cylinder provided integrally with the discoid body 4 on the side opposite to the flange surface 5. The movable flange 11 provided with the part 10 can be obtained.

  In this embodiment, the sliding member 2 is friction-welded to the bottom surface portion 7 opposite to the flange surface 5 of the disk-shaped body 4 and then the preliminary shape portion 6 is subjected to spinning processing to form the cylinder portion 10. However, the sliding member 2 may be friction-welded to the bottom surface portion 7 after forming the cylinder portion 10 by spinning the preliminary shape portion 6.

  In this embodiment, the boss 9 is formed at the end of the sliding member 2 on the side to be friction welded. However, the sliding member 2 may be configured to be capable of friction welding to the bottom surface of the flange material 1. The boss 9 may not be formed.

Explanatory sectional drawing which shows the process of the manufacturing method of this invention. Explanatory sectional drawing which shows the structure of the movable flange obtained by the manufacturing method of this invention. Explanatory sectional drawing which shows the example of 1 structure of a continuously variable transmission.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Sliding member, 3 ... Shaft hole, 4 ... Disk-shaped body, 5 ... Flange surface, 6 ... Preliminary shape part, 8 ... Hole part, 10 ... Cylinder part, 11 ... Movable flange.

Claims (3)

A shaft hole through which the rotating shaft is inserted, a flange surface formed on one surface of a disk-like body that has been subjected to carburizing and quenching treatment , extending in the outer circumferential direction of the shaft hole, and an inner diameter that is the same as that of the shaft hole A cylindrical sliding member that is provided with a hole portion and that is extended to the opposite side of the flange surface of the disk-like body and is subjected to carburizing and quenching treatment that slides along the axial direction of the rotating shaft, and the disk A continuously variable transmission provided with a cylinder portion that is provided integrally with the disc-like body on the opposite side of the flange surface of the rod-like body and forms a pressure chamber that allows the disc-like body to reciprocate in the axial direction of the rotating shaft. In the manufacturing method of the movable flange of the machine pulley,
A disk comprising the shaft hole, the flange surface , a preliminary shape portion for forming the cylinder portion on a surface opposite to the flange surface, and a bottom surface portion formed on the inner peripheral side of the preliminary shape portion Forming a body by hot forging;
Applying a carburizing agent to the pre-shaped portion and the bottom surface portion formed on the surface opposite to the flange surface of the disk-shaped body, and one end surface of the sliding member;
A step of carburizing and quenching the disc-like body having the preliminary shape portion coated with the carburizing agent , and the sliding member coated with the carburizing agent ;
The carburizing agent is removed from the disk-shaped body and the sliding member subjected to the carburizing and quenching treatment, and the sliding member is placed on the surface of the disk-shaped body opposite to the flange surface. A method of manufacturing a movable flange of a pulley for a continuously variable transmission, comprising: a step of friction welding the hole portion of the moving member so that the shaft hole of the disk-shaped body and the inner peripheral surface of each of the moving member coincide with each other.   The cylinder portion is formed by subjecting the preliminary shape portion to spinning processing after the sliding member is friction-welded to the surface of the disk-like body opposite to the flange surface. Manufacturing method of movable flange of pulley for continuously variable transmission. 2. The sliding member is friction-welded to a surface of the disc-shaped body opposite to the flange surface after the preliminary shape portion is subjected to spinning processing to form the cylinder portion. Manufacturing method of movable flange of pulley for continuously variable transmission.

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