JPH0394943A - Reinforced v-ribbed pulley and its manufacture - Google Patents

Abstract

PURPOSE:To reduce a distortion and a caulking shift and to improve the service life by assembling integrally a reinforcing plate to the bottom wall of a V-ribbed pulley by a bite action to a connecting hole part of a bulge thickness part. CONSTITUTION:When a movable board 46 is allowed to descend, a fixed part 48 of the upper die 44 is brought to descending actuation relatively against a movable part 50, and a punch 62 is protruded from the movable part 50. Subsequently, the part of the bottom wall 20 of a V-ribbed pulley 10 corresponding to a caulking hole 32 of a reinforcing plate 26 is brought to half blanking, and by an inrush portion of the punch 62, the thickness part of the part of the bottom wall 20 is bulged and rushed into the caulking hole 32 and bitten. Next, by a bite action to the caulking hole 32 of a bulge thickness part 70 of the bottom wall 20 of the V-ribbed pulley 10, the reinforcing plate 26 is assembled integrally to the bottom wall 20 of the V-ribbed pulley 10.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a reinforced V-ribbed pulley having a structure in which a reinforcing plate is integrally attached to the bottom wall of a bottomed cylindrical V-ribbed pulley manufactured by a rolling method. and its manufacturing method.

(Background technology) Conventionally, a preform with a bottomed cylindrical shape obtained by deep drawing a predetermined metal disc material is rolled, and a plurality of V IJs are formed on the outer peripheral surface of the cylinder wall. A V-ribbed pulley having a cylindrical shape with a bottom and a V-ribbed pulley portion has been manufactured. Conventionally, a reinforcing plate is integrally attached to the bottom wall of a V-ribbed pulley manufactured by such a rolling process to reinforce the bottom wall of the V-ribbed pulley.

By the way, when reinforcing the bottom wall of a V-ribbed pulley by integrally attaching a reinforcing plate to the bottom wall of a V-ribbed pulley manufactured by rolling, conventionally there are two methods as follows. has been adopted.

That is, one method is to align the reinforcing plate to the bottom wall of the V-ribbed pulley and integrate them by spot welding while overlapping them. A plurality of connection holes are formed in advance on either the bottom wall or the reinforcing plate, and a plurality of convex portions are formed in advance in one of them by half punching, corresponding to the connection holes. A V-ribbed pulley or reinforcing plate with a protruding connection hole formed therein and a reinforcing plate or V-ribbed pulley with a half-blanked convex part are aligned and overlapped, and from this overlapping state, a half-blanked convex part is formed. This is a method of integrally assembling the reinforcing plate to the bottom wall of the lifted boot by inserting the reinforcing plate into the connecting hole.

However, with the former method, there is a problem that not only does it cause a dent-like distortion at the spot where the spot is hit, but also the material at the spot where the spot hits changes and hardens. However, there are problems such as the generation of gaps between the two, and it is difficult to say that it is desirable. Also, even in the latter method,
Since it is required to accurately match the shape position of the connecting hole and the half punched convex part, there is a problem that high mold precision is required when punching them. There was a problem that the caulking displacement during assembly was relatively large, and the situation could hardly be called desirable.

(Problem to be solved) The present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is that the present invention is not manufactured using the conventional spot welding method or caulking method. The present invention provides an easy-to-manufacture reinforced V-ribbed pulley structure and manufacturing method that can effectively reduce or better eliminate defects such as distortion, caulking misalignment, and material deterioration and hardening compared to reinforced V-ribbed pulleys. It is about providing.

(Solution Means) In order to solve this problem, the reinforcement V according to the present invention
In the case of ribbed pulleys, the bottom wall of the V-ribbed pulley is inserted into a plurality of connection holes formed in either the bottom wall of the bottomed cylindrical V-ribbed pulley and the reinforcing plate, which are manufactured by rolling. The flesh of either the reinforcing plate or the reinforcing plate is made to bulge and protrude, and the protruding flesh part bites into each corresponding connection hole by the bulge and protrusion action,
Due to the biting action of the swollen meat part into the connection hole,
The feature is that the reinforcing plate is temporarily assembled to the bottom wall of the V-ribbed pulley.

In addition, in the method of the present invention, such structure reinforcement V
When manufacturing a ribbed pulley, the reinforcing plate 11 is superimposed on the bottom wall of the V-ribbed pulley with a plurality of connecting holes formed on one side of the bottom wall of the V-ribbed pulley and the reinforcing plate, and With the reinforcing plate set in a crimped shape and the V-ribbed pulley and reinforcing plate positioned, punch the flesh part of either the bottom wall of the ribbed pulley or the reinforcing plate that corresponds to the connecting hole. The reinforcing plate is inserted into the bottom of the V-ribbed pulley by half-blanking the reinforcing plate by making the flesh part bulge and protrude into the connection hole, and at the same time, the bulge part is bitten into each corresponding connection hole. Its distinctive feature is that it can be assembled integrally with the wall.

(Example) Hereinafter, in order to clarify the present invention more specifically,
Typical embodiments thereof will be described in detail based on the drawings. Here, the structure of the reinforced V-ribbed pulley according to the present invention will be specifically clarified while explaining its manufacturing method.

That is, when manufacturing a reinforced V-ribbed pulley, first, by rolling a bottomed cylindrical preform obtained by deep drawing a predetermined metal disc material,
In the same manner as before, a V-ribbed pulley 10 having a cylindrical shape with a bottom
Create. FIG. 1 shows an example of a V-ribbed pulley 10 manufactured by such a rolling method, and here, two V-ribbed pulleys each having a plurality of V-ribs 14 are formed on the outer peripheral surface of the cylinder wall l2. A V-ribbed pulley portion 16.18 is formed.

As shown in FIGS. 2 and 3, the bottom wall 20 of the ribbed pulley 10 manufactured by this rolling process has a central hole 22 of a predetermined diameter in the center, and a central hole 22 in the center thereof. A plurality of positioning holes 24 are punched out to surround the hole 22. Here, as shown in FIGS. 2 and 3, the positioning holes 24 are usually formed in an appropriate number (four in this case) at equal intervals in the circumferential direction on the concentric circle of the center hole 22. ing.

On the other hand, apart from the V-ribbed pulley 10, the V-ribbed pulley 1
A reinforcing plate 26 is prepared which is attached to the bottom wall 20 of the V-ribbed pulley 10 to reinforce the bottom wall of the A center hole 28 and a plurality of (four in this case) positioning holes 3o are punched out to correspond to the center hole 22 and positioning hole 24 of the wall 20, respectively. In addition, at the same time as punching out the center hole 28 and the positioning hole 30, the caulking hole 32 as a connecting hole is punched out.
An appropriate number of holes are punched out to surround the central hole 28. Note that, similar to the positioning hole 30, the caulking holes 32 are also formed on a concentric circle of the center hole 28 at regular intervals in the circumferential direction. As is clear, the four caulking holes 32 are located at the center of each circumferentially adjacent positioning hole 30, 30 on a concentric circle having approximately the same diameter as the circle in which the positioning holes 30 are arranged. It is stamped and formed.

The V-ribbed pulley 10 and the reinforcing plate 26, which have been subjected to the punching process as described above, are then placed one on top of the other so that the respective positioning holes 24 and 30 are aligned, as shown in FIG. So, the bottom mold 3 of the caulking mold
Set to 4.

That is, as shown in FIG. 5, the caulking-type lower mold 34 includes a lower mold main body 38 fixed to a fixed platen 36, and is arranged so as to surround the upper surface of the lower mold main body 38. V
It consists of an annular guide member 40 for guiding the bottom wall 20 of the ribbed pulley 10 to the caulking position on the upper surface of the lower wooden body 38, and is opposed to each other across the center hole 22 of the bottom wall 20 of the V-ribbed pulley 10. Two pilot bins 42, 42 are provided which extend upward and are located in the lower mold body 38 at the positions corresponding to the formation positions of the pair of positioning holes 24, 24.

When the V-ribbed pulley 10 and the reinforcing plate 26, which have been subjected to the punching process as described above, are prepared, the V-ribbed pulley 10 and the reinforcing plate 26 face each other with the respective center holes 22 and 28 in between. In each pair of positioning holes 24.24 and 30.30, the reinforcing plate 26 is placed first, that is, with the reinforcing plate 26 on the bottom side, and the pyronotch bin 42.42 is fitted into the lower die 34. It is.

Note that the diameter of the pilot bin 42.42 is set slightly smaller than that of the positioning hole 24.2'4 (30.3(1)), and when set in the lower die 34, , (2) The ribbed pulley 10 and the reinforcing plate 26 are roughly aligned.

Incidentally, the upper die 44, which together with the lower die 34 constitutes a caulking die, is a fixed die fixed to a movable platen 46 that is moved up and down with respect to a fixed platen 36, as shown in FIGS. 6 and 7. It consists of a portion 48 and a movable portion 50 disposed below the fixed portion 48. The movable part 50 is held by a cylindrical holding member 54 hanging from the movable platen 46 at an outward flange part 52 at its upper end, and the outward flange part 52 is held at the inner part of the lower end of the holding member 54. The lower end position that engages with the direction flange portion 56 and the upper surface of the fixed portion 4
It is configured such that it can move up and down a certain distance with respect to the fixing part 48 between the rising end position where it abuts the lower surface of the fixing part 8 . Further, a spring 58 is disposed between the outward flange portion 52 of the movable portion 50 and the movable platen 46, and urges the movable platen 46 in a direction to separate them from each other.
The movable portion 50 is always urged downward by the urging force 8.

Here, the fixed part 48 fixed to the movable platen 46 is opposed to the center hole 22 of the bottom wall 20 of the V-ribbed pulley 10 in a direction perpendicular to the arrangement direction of the pyrosotobins 42 and 42 of the lower die 34. A pair of positioning holes 24.24
Two pilot bins 60 and 60 are installed so as to extend downward and are located at positions corresponding to the formation positions of the movable part 50.
The movable portion 50 is slidably penetrated therethrough and protruded by a predetermined distance below the movable portion 50 .

Furthermore, four bunches 62 are implanted in the fixing portion 48 at positions corresponding to the formation positions of the caulking holes 32 of the reinforcing plate 26 so as to extend downward. 62 is slidably inserted into a through hole 64 formed in the movable part 50 and is normally accommodated in the through hole 64, but when the movable part 48 is at its upper end position, That is, when the punches 62 are relatively raised to a position where they come into contact with the fixed part 46, the tips of the punches 62 move downward from the lower surface of the movable part 50 by approximately half the thickness of the bottom wall 20 of the rifted pulley 10. It is designed to stand out.

In addition, as is clear from FIGS. 6 and 7, the lower mold 3
The movable part 50 of the lower mold main body 38 and the upper mold 44 of 4 has a pair of pylon pin housing holes each capable of accommodating the pilot bins 60, 60 on the upper mold 44 side and the pilot bins 42, 42 on the lower mold 34 side, respectively. 66.66 and 68.6
8 is formed.

When the perforated V-ribbed pulley 10 and the reinforcing plate 26 are placed on the lower mold 34 as described above, the movable platen 46 is moved downward and the upper mold 44
is forced to descend. When the upper die 44 is lowered, the biro pins 60.60 are first inserted into the corresponding positioning holes 24.30 formed in the bottom wall 20 and reinforcing plate 26 of the V-ribbed pulley 10. Then, accurate positioning of the ribbed pulley lO and the reinforcing plate 26 is performed, and then the lower surface of the movable part 50 is brought into contact with the bottom wall 20 of the V-ribbed pulley 10, and the upper die 4
The bottom wall 20 of the V-ribbed pulley 10 and the reinforcing plate 26 are pinched between the movable part 50 of No. 4 and the lower mold body 38 of the lower mold 34. FIGS. 6 and 7 show the state at this time.

The bottom wall 2o of the V-ribbed boot IJ10 and the reinforcing plate 26 are connected between the movable part 50 of the upper mold 44 and the lower mold main body 38 of the lower mold 34.
When the movable platen 46 is further lowered from the state where the two are pressed together, the fixed part 48 of the upper die 44 is moved downward relative to the movable part 50, and the bunches 62 are ejected from the movable part 50. As shown in FIG. 8, a portion of the bottom wall 20 of the V-ribbed pulley 10 corresponding to the caulking hole 32 of the reinforcing plate 26 is half-blanked, and the bottom wall 20 is cut in half by the amount that the bunch 62 enters. The flesh portion of the wall 2o bulges out and protrudes into the caulking hole 32, and is bitten into the caulking hole 32. Then, the protruding flesh portion 70 of the bottom wall 20 of the V-ribbed pulley 1o
By biting into the caulking hole 32, the reinforcing plate 26 is integrally assembled to the bottom wall 20 of the V-ribbed pulley 10 (see FIG. 9). In other words, a half-blanking caulking process is performed, thereby obtaining the intended reinforced V-ribbed pulley whose bottom wall portion is reinforced with the reinforcing plate 26.

In addition, the reinforced V-ribbed IJ manufactured in this way is
After the movable part 50 of the upper mold 44 is pulled out from the V-ribbed pulley 10 by the upward movement of the movable platen 46, it is taken out from the mold.

As described above, in the reinforced V-ribbed pulley manufactured according to the method of this embodiment, the attachment of the reinforcing plate 26 to the bottom wall 20 of the V-ribbed pulley 1o is as follows. Because this is done by half-cut caulking, there is almost no dent-like distortion at the connecting part, unlike reinforced V-ribbed pulleys manufactured using conventional spot welding methods.
The bottom wall 20 of the knobby boot 10 and the reinforcing plate 26 can be integrated in an extremely well-adhered state,
Furthermore, the material of these connecting parts will not undergo any deterioration or hardening.

In addition, since the half punching process is performed using the caulking hole 32 of the reinforcing plate 26 as a die, when punching and forming the caulking hole 32, the caulking hole and the half punching convex portion are formed in advance on the V-ribbed pulley 10 and the reinforcing plate 26, respectively. If you combine them and fix them by caulking,
Mold precision is not required, and there is no need for crimping.■
Misalignment between the ribbed boot 10 and the reinforcing plate 26 is also extremely well suppressed.

Although one embodiment of the present invention has been described in detail above, this is a literal illustration, and the present invention is not limited to such a specific example, and within the scope of the spirit thereof,
It goes without saying that the present invention can be implemented with various changes, modifications, improvements, etc.

For example, in the embodiment described above, a caulking hole 32 as a connection hole is formed on the reinforcing plate 26 side, and the flesh part of the bottom wall 20 of the V-ribbed pulley 10 bulges and protrudes into the caulking hole 32 to provide reinforcement. Although the plate 26 was designed to be integrally attached to the bottom wall 20 of the V-ribbed pulley 10,
As shown in FIG. 10, the bottom wall 20 of the V-ribbed pulley 10
By forming a caulking hole 32 on the side and making the flesh part on the side of the reinforcing plate 26 bulge and protrude into the caulking hole 32, the reinforcing plate 26 is attached to the bottom wall 20 of the ribbed pulley lO.
Depending on the situation, the reinforcing plate 26 may also be superimposed on the inner surface of the bottom wall 20 of the V-ribbed pulley 10 and fixed integrally therewith. be.

(Effects of the Invention) As is clear from the above description, the reinforced V-ribbed pulley having the structure according to the present invention is more susceptible to distortion and crimping than the reinforced V-IJ ribbed pulley manufactured by conventional spot welding and crimping methods. In addition to being able to significantly reduce misalignment, the material does not undergo deterioration or hardening, so the rotational characteristics, mechanical strength, and lifespan can be greatly improved compared to reinforced V-ribbed pulleys of conventional structure. According to the method of the present invention, a reinforced V-ribbed pulley having such a structure can be manufactured easily and satisfactorily.

[Brief explanation of drawings]

1 to 9 are explanatory diagrams for explaining one embodiment of the method of the present invention, and FIG. 1 is a sectional view showing an example of a V-ribbed pulley manufactured by the rolling method. 2 is a half-cut sectional view showing the bottom wall of the V-ribbed pulley shown in FIG.
FIG. 4 is a bottom view showing the V-ribbed pulley in the state shown in the figure, FIG. 4 is a plan view showing the reinforcing plate with holes punched, and FIG. It is a sectional view showing a state set in a lower mold,
FIG. 6 is a cross-sectional view showing a state in which the V-ribbed pulley and the reinforcing plate are clamped between the lower mold and the upper mold, and FIG. 7 is a cross-sectional view showing the same state as in FIG. 6 but different in cross-section. FIG. 8 is a sectional view corresponding to FIG. 6 showing a state in which the V-ribbed pulley and the reinforcing plate are crimped and fixed by a lower mold and an upper mold, and FIG. FIG. 3 is an enlarged cross-sectional view showing main parts of the V-ribbed pulley and the reinforcing plate. FIG. 10 is a sectional view corresponding to FIG. 9 of another embodiment of the present invention. 10: V-ribbed pulley 20; Bottom plate 24, 30: Positioning hole 26: Reinforcement plate: Caulking hole: Lower mold: Upper mold: Movable part: Bunch (connection hole) 42, 60: Byronto pin 48: Fixed part 58: Spring 70: Swollen meat part

Claims (2)

[Claims] (1) A reinforced V-ribbed pulley having a structure in which a reinforcing plate is integrally attached to the bottom wall of a bottomed cylindrical V-ribbed pulley manufactured by rolling, the bottom wall of the V-ribbed pulley and the reinforcement. The flesh of either the bottom wall of the V-ribbed pulley or the reinforcing plate bulges out and protrudes into the plurality of connection holes formed in either one of the plates, and the bulge becomes The reinforcing plate is integrally assembled to the bottom wall of the V-ribbed pulley by the bulging and thrusting action of the reinforcing plate, which bites into the corresponding connecting hole, and by the biting action of the bulging flesh part into the connecting hole. Reinforced V-ribbed pulley. (2) When a reinforcing plate is integrally attached to the bottom wall of a bottomed cylindrical V-ribbed pulley manufactured by rolling, a plurality of connections are made to either the bottom wall of the V-ribbed pulley and the reinforcing plate. With the holes formed, the reinforcing plate is superimposed on the bottom wall of the V-ribbed pulley, the V-ribbed pulley and the reinforcing plate are set in a crimped shape, and with the V-ribbed pulley and reinforcing plate positioned, When the flesh part of either the bottom wall of the V-ribbed pulley or the reinforcing plate corresponding to the connection hole is half punched using a punching means, and the flesh part bulges and protrudes into the connection hole. A method for manufacturing a reinforced V-ribbed pulley, characterized in that, at the same time, the reinforcing plate is integrally assembled to the bottom wall of the V-ribbed pulley by biting its bulging flesh into each corresponding connection hole.