JP5090844B2 - Manufacturing method of driving force transmission pulley - Google Patents

Description

  The present invention relates to a method of manufacturing a driving force transmission pulley that can suspend an endless belt to transmit a driving force of a vehicle.

  As shown in FIG. 23, a centrifugal clutch generally employed in a scooter type motorcycle includes a driven pulley 101 that suspends a V-belt from a driving pulley (not shown) that rotates by driving an engine, and the driven pulley. A drive plate 104 connected to the pulley 101, a clutch member 105 formed on the outer peripheral surface of the drive plate 104 and movable laterally by centrifugal force during rotation, and a clutch member 105 moved laterally And an output housing 106 that rotates together with the drive plate 104, and a shaft 107 that extends from the center of the output housing 106 and is connected to the rear wheel of the vehicle via a speed reducer.

  Of these, the driven pulley 101 (driving force transmission pulley) includes a fixed sheave 102 having a fixed taper surface 102a and a movable side facing the fixed taper surface 102a of the fixed sheave 102, as shown in FIG. It has a tapered surface 103a and is rotatable with the fixed sheave 102 while suspending an endless belt (V-belt) between the fixed side tapered surface 102a and the movable side tapered surface 103a. The movable sheave 103 is mainly composed of a movable sheave 103 that can be moved toward or away from the movable sheave 103, and the shift of the vehicle is performed by moving the movable sheave 103 toward or away from the fixed sheave 102.

  One end of a cylindrical shaft member 108 and a shaft member 109 is welded to the fixed sheave 102 and the movable sheave 103, and the fixed sheave 102 and the movable sheave 103 are rotatable about the shaft members 108 and 109. However, conventionally, the end portions of the shaft members 108 and 109 are raised in an annular shape, and the opening edges of the fixed sheave 102 and the movable sheave 103 corresponding thereto are also raised in an annular shape. It was welded by plasma welding or Tig welding. In addition, since this prior art does not relate to the literature known invention, there is no prior art document information to be described.

  However, in the conventional driving force transmission pulley, the fixed sheave 102 and the movable sheave 103 and the shaft members 108 and 109 are welded by plasma welding to the projecting ends of the rising portions formed respectively. Therefore, it is necessary to operate the welding torch in an annular shape, which requires a long time for the welding operation and increases the cycle time. Therefore, if a long time is required for the welding operation, heat input to the fixed sheave 102 and the movable sheave 103 becomes excessive, which may cause a problem that the fixed-side tapered surfaces 102a and 103a are distorted, for example.

  In order to solve the above problem, the present applicant presses the shaft members 108 and 109 into the openings of the fixed sheave 102 and the movable sheave 103, respectively, and contacts the electrodes with the edges of the openings to energize the fixed sheave 102. And the shaft member 108, and the movable sheave 103 and the shaft member 109 were examined for welding. However, in this case, a notch shape is generated at the corners of the welded portion of the fixed sheave 102 and the movable sheave 103 with the shaft members 108 and 109, and therefore stress is concentrated on the notch shape during use. There was a possibility that it might be damaged and the strength was reduced.

  The present invention has been made in view of such circumstances, and allows the fixed sheave or the movable sheave and the shaft member to be welded in a short time and well, shortening the cycle time during manufacture and improving the assembling accuracy. Provided is a driving force transmission pulley manufacturing method that can reduce the stress concentration and improve the strength by removing the notch shape in the welded portion between the fixed sheave or the movable sheave and the shaft member. There is to do.

  The invention according to claim 1 has a fixed sheave formed with a fixed taper surface, and a movable taper surface facing the fixed taper surface of the fixed sheave, the fixed taper surface and the movable taper surface A movable sheave that can be rotated together with the fixed sheave while suspending an endless belt between the movable sheave and a circular opening at a substantially center of the fixed sheave and the movable sheave. It has an opening and a cylindrical shaft member that is welded to the opening of the fixed sheave and the movable sheave and protrudes from each of them to form the rotation shaft of the fixed sheave and the movable sheave, and transmits the driving force of the vehicle In the manufacturing method of the driving force transmission pulley for performing, the edge portion of the opening of the fixed sheave or the movable sheave is bent outwardly in the radial direction of the fixed sheave or the movable sheave. A bending step of forming the shaft member, and an electrode is brought into contact with the bent portion while the shaft member is press-fitted into the opening portion and energized to weld the shaft member to the fixed sheave or It has the welding process welded to a movable sheave, and the removal process which removes the said bending part after this welding process.

  According to a second aspect of the present invention, in the method for manufacturing a driving force transmitting pulley according to the first aspect, the bending step includes the opening edge of the fixed sheave or the movable sheave, and the fixed sheave or the movable sheave. A burring process that rises in the axial direction to form a rising part, a curling process that folds the rising part formed by the burring process outward in the radial direction, and a part that is bent by the curling process is further bent outward in the radial direction. And a flatting process for forming the bent portion.

  The invention according to claim 3 is the manufacturing method of the pulley for driving force transmission according to claim 1 or claim 2, wherein the bent portion formed in the bending step is cut and then the welding step. In this case, the electrodes are brought into contact with each other.

  According to a fourth aspect of the present invention, in the method for manufacturing a driving force transmitting pulley according to any one of the first to third aspects, the removing step includes removing the bent portion by cutting. Features.

  According to the first aspect of the present invention, the shaft member is pressed into the opening while the electrode is brought into contact with the bent portion and energized, whereby the electric resistance is welded in an annular shape, and the shaft member is fixed to the fixed sheave or the movable sheave. Since welding is performed, the fixed sheave or the movable sheave and the shaft member can be welded in a short time and satisfactorily, and the cycle time during manufacture can be shortened and the assembling accuracy can be improved.

  In addition, since the bent portion with which the electrode abuts is formed in the bending process, it is possible to form a bent portion of an arbitrary size, and more reliably perform welding by energization, and weld Since the bent portion is removed after the process, the stress concentration can be suppressed and the strength can be improved by removing the notch shape in the welded portion between the fixed sheave or the movable sheave and the shaft member.

  According to the invention of claim 2, the bending step includes a burring process in which the opening edge of the fixed sheave or the movable sheave is raised in the axial direction of the fixed sheave or the movable sheave to form a rising portion, and the burring Since it has curling process that bends the rising part formed by machining outward in the radial direction and flatting process that further bends the part bent by the curling process radially outward to form the bent part, more reliably And a bending part can be formed easily.

  According to invention of Claim 3, since the electrode is contact | abutted by the welding process, after the bending part formed in the bending process is cut, welding and press-fit in the said welding process are more reliable and It can be performed with high accuracy.

  According to invention of Claim 4, since a removal process removes a bending part by cutting, the location where the notch shape in the welding part produced | generated can be removed more reliably.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The driving force transmission pulley according to this embodiment is applied to a driven pulley of a centrifugal clutch device in a scooter type motorcycle. Such a centrifugal clutch device is for transmitting and interrupting engine driving force in a scooter type motorcycle. As shown in FIG. 1, a driven pulley 1, a drive plate 4, a clutch member 7, and an output It is mainly composed of a housing 6 and a shaft 7.

  The driven pulley 1 is configured such that a resin V belt 10 (endless belt) can be suspended between a driven pulley (not shown) that is rotated by driving a motorcycle engine. The driven pulley 1 is composed of a fixed sheave 2 and a movable sheave 3 made of a metal molded product, and a taper surface (fixed side taper surface 2a and movable side taper surface 3a) is formed at a space between the fixed sheave 2 and the movable sheave 3. Is formed. The V belt 10 is fitted into these opposing tapered surfaces, and the V belt 10 is suspended between the drive pulleys.

  A cylindrical shaft member 8 protrudes from the substantially center of the fixed sheave 2, and a needle bearing B1 and a ball bearing B2 are disposed on the inner peripheral surface 8b of the shaft member 8 to rotate the shaft 7. It can be inserted freely. A movable sheave 3 is assembled on the outer periphery of the fixed sheave 2 by spline fitting. Both sheaves can be rotated along with the rotation of the V-belt 10, and the movable sheave 3 can be moved closer to or away from the fixed sheave 2. It is said that.

  Specifically, the movable sheave 3 is constantly urged by the spring SP in the direction approaching the fixed sheave 2 (that is, the direction in which the fixed taper surface and the movable taper surface are close to each other), and the driven pulley. When the diameter-reducing operation of the V-belt 10 in 1 is applied, the V-belt 10 can move in a direction away from the fixed sheave 2 (left direction in the figure) against the urging force of the spring SP. As with the fixed sheave 2, a cylindrical shaft member 9 is formed on the movable sheave 3 so as to protrude from substantially the center thereof, and the shaft member 8 of the fixed sheave 2 extends along the inner peripheral surface 9 b of the shaft member 9. Can slide.

  Accordingly, when the rotational speed of the engine is increased, the insertion portion of the V-belt 10 on the drive pulley side is narrowed and the diameter thereof is widened. Accordingly, the V-belt 10 on the driven pulley 1 side is shown by the arrow in FIG. In response to this action, the movable sheave 3 moves to the left (in the direction in which the diameter of the fitting portion of the V-belt 10 decreases) and shifts up. As described above, the centrifugal clutch device of the present embodiment is configured such that a shift change is automatically made according to the vehicle speed.

  The drive plate 4 is connected to the fixed sheave 2 of the driven pulley 1 and can rotate together with the driven pulley 1. The outer peripheral surface of the drive plate 4 is a clutch made of a friction material movable in the radial direction (the vertical direction in the figure). A member 5 and a weight 11 are provided. That is, when the number of rotations of the driven pulley 1 exceeds a predetermined value, the clutch member 5 moves in the direction of expanding the diameter by the centrifugal force, and can contact the inner peripheral surface of the flange portion of the output housing 6 so that the output The housing 6 is rotated around.

  The output housing 6 is formed in an umbrella shape having an insertion hole 6a formed substantially at the center and covering the outer peripheral surface of the drive plate 4. The tip of the shaft 7 is inserted into the insertion hole 6a. It is configured to be able to. Further, a cylindrical member 6b extending toward the driven pulley 1 is integrally formed (for example, fixed by welding or the like) from the peripheral edge of the inner peripheral surface of the insertion hole 6a, and formed on the inner peripheral surface of the cylindrical member 6b. The assembled spline is assembled so as to mesh with a spline formed on the shaft 7 side.

  The tip of the shaft 7 is connected to the output housing 6 by a tightening nut N and can rotate with the output housing 6. A reduction gear (configured by a reduction gear or the like) (not shown) is connected to the base end side of the shaft 7 so that the rear wheels of the motorcycle can be driven. That is, when the driven pulley 1 reaches a predetermined number of revolutions, the clutch member 5 comes into contact with the output housing 6 by the centrifugal force, and the rotational force of the driven pulley 1 and the drive plate 4 passes through the output housing 6. And transmitted to the shaft 7 to drive the rear wheels of the motorcycle.

  As shown in FIG. 2, the fixed sheave 2 in the present embodiment has an opening A formed in a circular shape at the substantially center thereof, and one end (in the radial direction) of the cylindrical shaft member 8 is formed in the opening A. The thick-walled portion 8a) formed by bulging is welded to project the shaft member 8 from the fixed sheave 2. Thus, the fixed sheave 2 is rotatable about the shaft member 8 as a rotation shaft in a state where the fixed sheave 2 is assembled to the driven pulley 1 (pulley for driving force transmission).

  More specifically, a thick-walled portion 8a bulging in a radial direction from the outer peripheral surface of the shaft member 8 is formed at the welded portion of the shaft member 8 with the fixed sheave 2, and the thick-walled portion 8a. Is pressed into the opening A of the fixed sheave 2 and energized between the edges of the opening to weld the shaft member 8 to the fixed sheave 2. That is, the inner diameter dimension of the opening A of the fixed sheave 2 is set to be slightly smaller than the outer diameter dimension of the thick part 8a, and the thick part is formed in the opening A by an annular electric resistance welding apparatus to be described later. While 8a is press-fitted, it is energized and welded.

  As a result, the fixed sheave 2 and the shaft member 8 can be welded in a shorter time and better than the conventional plasma welding or Tig welding using a welding torch, shortening the cycle time during manufacture and assembling accuracy. Can be improved. That is, according to the annular electric resistance welding as in the present embodiment, the welding work is shorter in comparison with the plasma welding, and the fixed sheave 2 and the shaft member 8 are reduced while suppressing the distortion by reducing the heat input. Welding can be performed.

  Here, in the present embodiment, a bending step of bending the opening edge portion of the fixed sheave 2 outwardly in the radial direction of the fixed sheave 2 to form a bending portion, and the shaft member 8 is press-fitted into the opening portion. While the electrode is brought into contact with the bent portion and energized, an annular electric resistance welding is performed, and a welding step of welding the shaft member 8 to the fixed sheave 2 is removed, and the bent portion is removed after the welding step. The manufacturing method has a process. Hereinafter, the bending process will be described in detail with reference to FIGS.

  First, a blank material having an opening A ′ at the approximate center is prepared (see FIG. 3A), and press processing is performed to obtain a predetermined shape (see FIG. 3B). Then, the edge of the opening A ′ of the fixed sheave 2 is raised in the axial direction of the fixed sheave 2 (downward in the drawing) to form a rising portion A′a (burring process: see FIG. 5C). After the rising portion A′a formed by the burring process is bent outward in the radial direction (left and right direction in the figure) (curling process: see FIG. 4D), the bent part is further formed by the curling process. A bent portion 2b ′ is formed by bending outward in the radial direction (flatting process: see FIG. 5E).

  In addition, the press work with respect to a blank material is performed by the 1st press apparatus P1 as shown in FIG. 4, and the workpiece | work press-formed by this press apparatus P1 is performed by the 2nd press apparatus P2 shown in FIG. Burring is performed. Then, the workpiece subjected to the burring process is curled by a third press device P3 shown in FIG. 6, and then flattened by a fourth press device P4 shown in FIG. 'Will be formed.

  As shown in FIG. 8, the fourth press apparatus P4 for performing the flatting process has a convex part t on its upper die P4a. During the flatting process, the shape of the convex part t is a workpiece. Pressurized by being transferred to the side. As a result, as shown in FIG. 9, the material flows well to the corner s of the portion (opening A ″ edge) processed by the flatting process, and the bent portion 2b ′ with high accuracy is obtained. And the opening A ″ can be formed.

  Thereafter, the hatched portion shown in FIG. 9 (the surface of the bent portion 2b ′ and the opening A ″ in the workpiece) is cut by cutting, and as shown in FIG. 3 (f) and FIG. Forming the portion 2b and the opening A. By forming the bent portion 2b in this way, the contact area of the electrode can be increased during the subsequent welding step, and the current-carrying efficiency can be improved. The pressure receiving area at the time of press fitting can be secured.

  Thereafter, as shown in FIG. 11, the shaft member 8 is press-fitted into the opening A of the fixed sheave 2 that has undergone the bending process as described above, and the electrode is brought into contact with the bent portion 2b to be energized. An annular electrical resistance welding is performed, and a welding process is performed in which the shaft member 8 is welded to the fixed sheave 2. As shown in FIG. 12, the welding by the welding process results in notched shapes ka and kb in the welded portion. In this embodiment, the surface on the notched shape ka side (that is, the bent portion). The portion on the 2b side, which is shaded in the figure, is removed by cutting (removal process) to have a shape as shown in FIG.

  Note that only the surface on the notch shape Ka side is removed by cutting, but both sides may be cut to remove both the notch shapes Ka and Kb. However, when the fixed sheave 2 is assembled and functions as a driving force transmission pulley, the load applied to the welded portion from the V-belt 10 (see FIG. 1) applies a tensile stress to the notch shape Ka side, and the cut Since compressive stress is applied to the notch shape Kb side, it is sufficient to remove only the notch shape Ka side (only the bent portion 2b side) to which tensile stress is applied. This is because when the tensile stress is applied to the notch shape, there is not much adverse effect such as breakage due to the stress concentration than when the compressive stress is applied.

  On the other hand, as shown in FIG. 14, the movable sheave 3 according to the present embodiment has an opening B formed in a circular shape at substantially the center thereof. The shaft member 9 is formed to protrude from the movable sheave 3 by welding the right end portion in the drawing. Thus, the movable sheave 3 is rotatable about the shaft member 9 as a rotation shaft in a state where the movable sheave 3 is assembled to the driven pulley 1 (pulley for driving force transmission).

  More specifically, like the welding of the shaft member 8 and the fixed sheave 2, the end of the shaft member 9 is pressed into the opening B of the movable sheave 3 and energized between the edges of the opening B. Thus, the ring-shaped electric resistance welding is performed, and the shaft member 9 is welded to the movable sheave 3. That is, the inner diameter dimension of the opening B of the movable sheave 3 is set to be slightly smaller than the outer diameter dimension at one end of the shaft member 9, and the shaft member 9 is inserted into the opening B with an annular electric resistance welding apparatus. It is welded by energizing while pressing. As a result, similar to the welding of the shaft member 8 and the fixed sheave 2, the welding operation can be completed in a shorter time than the plasma welding, and the welding of the movable sheave 3 and the shaft member 9 while suppressing distortion by reducing the amount of heat input. It can be performed.

  Here, similarly to the fixed sheave 2, a bending step of bending the opening edge of the movable sheave 3 to the outside in the radial direction of the movable sheave 3 to form a bent portion, and the shaft member 9 is press-fitted into the opening. While the electrode is brought into contact with the bent portion while being energized, an annular electric resistance welding is performed, and a welding step of welding the shaft member 9 to the movable sheave 3 is removed, and the bent portion is removed after the welding step. The manufacturing method has a process. Hereinafter, the bending process will be described in detail with reference to FIGS.

  First, a blank material having an opening B ′ at the approximate center is prepared (see FIG. 15A), and press processing is performed to obtain a predetermined shape (see FIG. 15B). Then, the edge of the opening B ′ of the movable sheave 3 is raised in the axial direction (downward in the figure) of the movable sheave 3 to form a rising part B′a (burring process: see FIG. 10C). Further, after bending the rising portion B′a formed by the burring process outward in the radial direction (left and right direction in the figure) (curling process: refer to the figure (d)), the portion bent by the curling process is further A bent portion 3b ′ is formed by bending outward in the radial direction (flatting process: see FIG. 5E).

  The blank material is pressed by a fifth press apparatus P5 as shown in FIG. 16, and the workpiece press-formed by the press apparatus P5 is processed by a sixth press apparatus P6 shown in FIG. Burring is performed. Then, the workpiece subjected to the burring process is curled by a seventh press apparatus P7 shown in FIG. 18, and then flattened by an eighth press apparatus P8 shown in FIG. 'Will be formed.

  In the eighth press apparatus P8 for performing the flatting process, similarly to the fourth press apparatus P4 of the fixed sheave 2, the upper die P8a has a convex portion (not shown). The shape of the convex portion is transferred to the workpiece side so as to be pressurized. As a result, the material can be favorably flown to the corner of the portion (opening B ″ edge portion) processed by the flatting process, and a highly accurate bent portion 3b ′ and opening B ″ can be formed. It is said.

  Thereafter, similarly to the fixed sheave 2, the bent portion 3b ′ and the surface of the opening B ″ of the workpiece are cut by cutting, and the substantially flat bent portion 3b and the opening are cut as shown in FIG. The portion B is formed in this way, and by forming the bent portion 3b in this way, it is possible to increase the contact area of the electrode and improve the current-carrying efficiency in the subsequent welding step, and to receive pressure during press-fitting An area can be secured.

  Thereafter, as shown in FIG. 20, the shaft member 9 is press-fitted into the opening B of the movable sheave 3 that has undergone the bending process as described above, and the electrode is brought into contact with the bent portion 3 b to be energized. An annular electrical resistance welding is performed, and a welding process is performed in which the shaft member 9 is welded to the movable sheave 3. As shown in FIG. 21, in this welding process, as shown in FIG. 21, notched shapes La and Lb are formed in the welded portion. In the present embodiment, the surface on the notched shape La side (that is, the bent portion). The part on the 3b side, which is shaded in the figure, is removed by cutting (removal process) to have a shape as shown in FIG.

  Although only the surface on the notch shape La side is cut and removed, a configuration may be adopted in which both the notch shapes La and Lb are removed by cutting both sides. However, when the movable sheave 3 is assembled and functions as a driving force transmission pulley, the load applied to the welded portion from the V-belt 10 (see FIG. 1) applies a tensile stress to the cutout shape La side. Since compressive stress is applied to the notch shape Lb side, it is sufficient to remove only the notch shape La side (only the bent portion 3b side) to which tensile stress is applied.

  According to the said embodiment, since the bending parts 2b and 3b which an electrode contact | abuts are formed in the bending process, the bending parts 2b and 3b of arbitrary dimensions can be formed, and welding by energization is more Since the bent portions 2b and 3b are removed after the welding process, the notched shape at the welded portion between the fixed sheave 2 or the movable sheave 3 and the shaft members 8 and 9 can be removed. Stress concentration can be suppressed and strength can be improved.

  In the bending step, the edges A and B of the fixed sheave 2 or the movable sheave 3 are raised in the axial direction of the fixed sheave 2 or the movable sheave 3 to form the rising portions A′a and B′a. Burring process, curling process for bending the rising parts A′a and B′a formed by the burring process radially outward, and further bending the part bent by the curling process to the radially outer side Therefore, the bent portions 2b and 3b can be formed more reliably and easily.

  Furthermore, according to the present embodiment, the bent portions 2b and 3b formed in the bending process are subjected to cutting and then the electrodes are brought into contact with each other in the welding process. Therefore, welding and press-fitting in the welding process are performed. The removal process can remove the bent portions 2b and 3b by cutting, so that the portion where the notch shape occurs in the welded portion can be more reliably removed. .

  Although the present embodiment has been described above, the present invention is not limited to this. For example, only one of the welding operation between the fixed sheave and the shaft member or the welding operation between the fixed sheave and the shaft member is described above. You may comprise so that it may pass through such a bending process, a welding process, and a removal process. In addition, if it is a driving force transmission pulley that can suspend an endless belt, the pulley of another form (a form different from that arranged corresponding to the drive pulley of the scooter type motorcycle as in this embodiment) You may apply to.

  Bending process of forming the bent portion by bending the opening edge of the fixed sheave or movable sheave radially outward of the fixed sheave or movable sheave, and the electrode at the bent portion while pressing the shaft member into the opening And welding the annular member by electrical resistance welding to weld the shaft member to the fixed sheave or the movable sheave, and the removing step of removing the bent portion after the welding step. If it is a manufacturing method of the pulley for a driving force transmission, it can apply also to the thing from which the external appearance differs or another function was added.

1 is a schematic cross-sectional view showing a centrifugal clutch device to which a driving force transmission pulley according to an embodiment of the present invention is applied. Sectional schematic diagram showing the fixed sheave and its shaft member in the pulley for driving force transmission Sectional drawing which shows the manufacturing process of the fixed sheave in the pulley for power transmission Longitudinal sectional view showing the first press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) Longitudinal sectional view showing the second press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) Longitudinal sectional view showing the third press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) Longitudinal sectional view showing the fourth press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) An enlarged schematic diagram showing a bent portion (state during press molding) formed in a fixed sheave in the power transmission pulley. An enlarged schematic diagram showing a bent portion (state after press molding) formed on a fixed sheave in the pulley for power transmission An enlarged schematic diagram showing a bent portion (state after cutting) formed on a fixed sheave in the pulley for power transmission Schematic diagram showing the welding process between the fixed sheave and the shaft member in the power transmission pulley An enlarged schematic diagram showing a state before the removal process in which the fixed sheave and the shaft member are welded in the pulley for power transmission The enlarged schematic diagram which shows the state after the removal process in the state which the fixed sheave and the shaft member in the pulley for power transmission were welded Sectional schematic diagram showing the movable sheave and its shaft member in the pulley for driving force transmission Sectional drawing which shows the manufacturing process of the movable sheave in the pulley for power transmission Longitudinal sectional view showing the fifth press device in the power transmission pulley (the left side of the center line is before processing and the right side is after processing) Longitudinal sectional view showing the sixth press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) Longitudinal sectional view showing the seventh press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) Longitudinal sectional view showing the eighth press device in the power transmission pulley (the left side from the center line is before processing and the right side is after processing) Schematic diagram showing the welding process between the movable sheave and the shaft member in the power transmission pulley An enlarged schematic diagram showing a state in which the movable sheave and the shaft member in the pulley for power transmission are welded and before the removal step An enlarged schematic diagram showing the state after the removal process in which the movable sheave and the shaft member are welded in the power transmission pulley. Sectional schematic diagram showing a centrifugal clutch device to which a conventional pulley for driving force transmission is applied

Explanation of symbols

1 Driven pulley (drive force transmission pulley)
2 fixed sheave 2b bent part 3 movable sheave 3b bent part 4 drive plate 5 clutch member 6 output housing 7 shaft 8 shaft member 8a thick part 9 shaft member 10 endless belt 11 weight A, B opening A'a , B'b Rising part

Claims (4)

A fixed sheave having a fixed-side tapered surface;
The movable sheave has a movable taper surface facing the fixed taper surface of the fixed sheave, and is rotatable with the fixed sheave while suspending an endless belt between the fixed taper surface and the movable taper surface. A movable sheave that can be moved close to or away from the fixed sheave;
An opening opening in a circular shape at substantially the center of the fixed sheave and the movable sheave;
A cylindrical shaft member welded to the opening portions of the fixed sheave and the movable sheave and projecting from each of them to form a rotation axis of the fixed sheave and the movable sheave;
In the manufacturing method of the driving force transmission pulley for transmitting the driving force of the vehicle,
A bending step of bending the opening edge of the fixed sheave or movable sheave to the outside in the radial direction of the fixed sheave or movable sheave;
A welding step of welding the shaft member to the fixed sheave or the movable sheave by press-fitting the shaft member into the opening and bringing the electrode into contact with the bent portion and energizing the shaft to weld the shaft member to the fixed sheave or the movable sheave. When,
After the welding step, a removing step for removing the bent portion;
A method for manufacturing a driving force transmitting pulley, comprising: The bending step includes
A burring process in which the opening edge of the fixed sheave or movable sheave is raised in the axial direction of the fixed sheave or movable sheave to form a rising portion;
Curling process for bending the rising part formed by the burring process outward in the radial direction;
A flatting process for forming the bent portion by further bending the portion bent by the curling process radially outward;
The method for manufacturing a driving force transmitting pulley according to claim 1, wherein:   3. The driving force transmitting pulley according to claim 1, wherein an electrode is contacted in the welding step after the bent portion formed in the bending step is cut. 3. Production method.   The said removal process removes the said bending part by cutting, The manufacturing method of the pulley for driving force transmission as described in any one of Claims 1-3 characterized by the above-mentioned.

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