JPS5825826A - Manufacture of double v-pulley - Google Patents

Abstract

PURPOSE:To obtain a double V-pulley having good water draining property and convenient for superposition by giving an inclination angle to the circumferential part that connects a large-diameter V-groove and a small diameter V-groove in a double V-pulley. CONSTITUTION:In a double pulley, a small-diameter V-groove 8 is formed by rims 6, 7, and a large-diameter V-groove 16 is formed by rims 17, 18. A inclination of alpha degrees is given to the circumferential part 9 that connects the small- diameter V-groove 8 side and large-diameter V-groove 16 side slightly opening from the horizontal direction to large-diameter V-groove 16 side. By this way, the drainage of water of the product is improved, and pulleys can be superposed as shown by alternate long and short dash lines. Further, the dimensional accuracy of the product is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a two-stage V-pulley, and more specifically, a two-stage V-pulley made of sheet metal (squeezed from a single plate) having two V-grooves with different diameters on the same axis. ) relates to the method of manufacturing pulleys.

Sheet metal pulleys are made by pressing a single plate such as JLLM, etc., and take advantage of their light weight and low cost.
It is now widely used in place of traditional cast iron pulleys.

However, the two-stage V pulley currently in common use is
A longitudinal sectional view of the center front view is shown in FIG. 4. In other words, a vertical disk (b) with a boss hole (a) in the center has a branch line (c) extending diagonally to the right on the outer periphery as shown in Figure 4, which is folded back), and conversely, a branch line extending diagonally to the left as shown in Figure 4. Extending branch line (
A small-diameter ■groove (H) is formed by (E), while a large-diameter V-groove (H) is formed by a branch line (G) that extends diagonally to the left, and conversely, a branch line (G) that extends diagonally to the right. and this branch line (
The feature was that the branch line (E) was connected to the branch line (E) through a folded-back branch line (E) and a circumferential portion (4) extending horizontally on the same axis.

However, there was a problem in forming the V-groove of the horizontal two-stage pulley on the circumferential portion (c) of the lower end as shown in FIG. Fifth
The figure is an enlarged cross-sectional view of a main part of the two-stage V pulley shown in FIG. 4, showing a state where the large diameter V#le is formed and then the small diameter V@ is formed.

Press the convex lower die (the convex upper die 9, which is not shown but is attached to a rotating shaft and is rotatably attached to the rotating shaft, also not shown) and move it up and down. Compress. At this time, although not shown in the drawings, a so-called rotational molding method is generally used in which a rotatable V molding funnel is pressed from the side to form a V groove.

However, in the semi-finished product used for the molding shown in Fig. 5, since the circumferential part at the child end is horizontal, when attaching it to the convex lower mold (→),
The convex lower mold (circumferential part at the terminal end) could not be fitted unless it was the same or larger size.As a result, the deflection due to the eccentricity of the product varied, and this drawback was caused by the force f Also, when pushing the V-groove molding roller, the upper mold (2) and lower mold (the molded product is compressed vertically in the field, so the small diameter V-groove branch line (to) ) and the part of the corner (to) of the ridge line leading to ) had a tendency to swell outward and overhang.

On the other hand, when performing dipping painting or plating surface treatment, etc., if the pulley is hung to dry, the large diameter folded recess (7) shown in Figure 4 should be inserted into the However, at this time, there was a drawback that moisture remained in a part of the corner (9), which caused rust. Furthermore, when storing the pulleys, they cannot be stacked on top of each other, resulting in bulky pulleys, which is a major problem.

In view of the above-mentioned circumstances, the present invention provides a method for manufacturing a two-stage V-pulley that has good dimensional accuracy, good drainage of products, ease of stacking, and improved quality and accuracy as a V-pulley. This is something newly created here for the purpose of benevolence.

In the present invention, this means that the interval connecting the V-grooves is about the same or larger than the width of the small-diameter V-groove.

The present invention will be described in detail below based on the drawings of FIGS. 1 to 3.

Figure 5 shows a state in which a single steel plate is drawn into a stepped camp-shaped cylindrical body, and the semi-finished product, which has been formed into a small diameter V groove, is being formed into a large diameter V#lI. FIG. 2 is an enlarged sectional view of main parts.

elf) A concave lower mold that rotates under axial pressure from the rotating shaft (not shown). Although not shown in the figure, (2) is a convex upper mold rotatably attached to the shaft.

Like the Q3Vi, it is a rotatable V-groove forming roller, although not shown in the drawings. The upper mold (2) and the lower mold (2) are compressed vertically and at the same time, a V-groove molding roller is pushed in from the side to form a V-groove, and this is the manufacturing method according to the present invention.

Fig. 1 is a front view of the two-stage ■ pulley of the present invention manufactured in this way, seen from the small diameter V@ side, and Fig. 2 is a central longitudinal section taken along line A-A' in Fig. 1. It is a diagram.

(1) C is the central guide hole, and (2) is the first vertical disk. (3) C. There are four mounting holes (3), (3), (3), and (3) drilled in the first vertical disk +21.

First vertical disc (2) C first outer corner (4)
From this position, a branch line (5) extends diagonally to the right as shown in Figure 2, which is folded back to become a standing edge (6), and this branch line (6) and a standing edge (7) which extends diagonally to the left form a branch line (5). A small diameter V-groove (8) is configured.

Next, on the same axis line, which is a feature of the present invention, the peripheral part (9) K is connected to the lower end inclined by φ degrees (9) K is connected to the V-groove side with a larger diameter than the horizontal direction. The (b) degree in the example is 15 degrees.° Also, the circle in Figure 1 (+01 is the circumference of the first folded corner (10a) in Figure 2 and the child end from the branch line (7) +91 First bending corner leading to VC (1
0b).

The interval between the circumferential parts (9) expands to the second vertical disk O2 through the corner part 01 of the twill line, and becomes a branch line 0I that extends diagonally to the right again from the second outer circumferential corner (position 131). , this branch line Q31H is folded back at the second folded corner (15a) and formed into a large diameter V groove (16
Branch line 0' that forms one side of 1? It is l. This branch line α'71 has the diameter of the branch line 08) extending diagonally to the left, which is another side of the larger diameter V-groove Q61, and ends at the outer peripheral end (15c) from the second bending corner (15b). . Therefore, the circumference of Fig. 1 (previously, the second folded corner (15a), second folded corner (15b) of Fig. 2)
) and the outer peripheral end (15c) are shown.

In the two-stage V pulley of the above embodiment, the large-diameter V-groove stop has a larger belt size than the small-diameter V-groove (8).

After the two-stage V pulley of the above example has been subjected to surface treatment such as painting or plating, the pulley is hung by hooking the large diameter folded recess (■) in Figure 2 with a nozzle (not shown). After drying, since the flat circumferential portion (9) is inclined, no moisture remains in the corner portion 09, and the cause of rusting can be eliminated. In addition, the pulleys can be stacked one on top of the other as shown by the two-dot broken line in FIG. 2, allowing for stable storage and transportation in a low bulk state. This is the flat circumferential part (9)
Since it is slanted, it can be attached and detached freely.

If the flat end (5) extends in the horizontal direction as in the conventional example with 6 digits, even if the pulleys could be overlapped, the pulleys would not have a taper and would become wedged in each other, making it difficult to remove them. the removable angle of inclination;
The range is preferably 0 degrees or more and 20 degrees or less.

Corner (4) and αJ in the above embodiment may also be part of the same ridgeline corner as 01). Furthermore, both V grooves (8), G'6
Of course, it is also possible to use belts 1 of the same size.

As mentioned above, the two-stage V pulley produced by the method of the present invention has good drainage, etc., and can be stacked on top of each other, which was previously impossible, so the volume during transportation can be reduced, and there is no need to use wrapping paper in the middle. In addition to the unprecedented new function and effect of not causing paint peeling even when the paint is applied, one of the major features of the present invention is that the frequency of occurrence of defective products with high accuracy is low, as described below.

That is, in the two-stage pulley manufactured from a single plate as in the above embodiment, first the first Vllll (81) is molded, and then the second V111061 is molded, and these two grooves are simultaneously molded. Therefore, if the reference position when molding the first groove (8) and the second Vlll061 are not the same, both l1lI
VC eccentricity occurs and the pulley mounting hole +31 +3+
If this reference position is not the same when drilling +3+ +3+ or the center guide hole (1), eccentricity will cause runout and the accuracy of the product will deteriorate.

However, in the case of the conventional example mentioned above, the flat end circumferential part (6) in Fig. 4 is horizontal, so when forming the first V groove (H), the flat end circumferential part (6) is ), the corner of the twill line tends to bulge outward,
The flat end circumferential part (c) must be the same or larger in diameter than the convex lower part (c). Therefore, the flat end circumferential part (
The conventional manufacturing method based on (c) increases the error and causes eccentricity. However, when manufacturing a two-stage pulley by the method of the present invention having a configuration like the above embodiment, a taper (partially By compressing and manufacturing with a concave-convex mold to absorb variations in semi-finished products and make them highly accurate with the same dimensions, it is possible to absorb variations in semi-finished products with a taper.

Therefore, when comparing the runout of the belt contact surface, the average runout was 0.55 am and the maximum runout was 0.86mm in the conventional example, but the two-stage V pulley manufactured by the method according to the embodiment of the present invention has a It is now possible to manufacture with an accuracy range of average 033n and maximum runout 041mm. This has a new and highly accurate effect that it can pass the automobile industry standard that the runout of the belt contacting surface is 0.5n or less. A two-stage V pulley is manufactured using a novel method.

[Brief explanation of drawings]

Figures 1, 2, and 5 show an embodiment of the two-stage pulley of the present invention; Figure 1 is a front view, and Figure 2 is a
Figure 5 is a cross-sectional view of the main part showing the state in which a large-diameter groove is being formed by the method of the present invention; Figures 4 and 5 are two-stage cross-sectional views taken along line A'; FIG. 5 is a front center longitudinal sectional view showing an example of a conventional V pulley.
FIG. 3 is a cross-sectional view of a main part showing a state in which a groove is being formed. (8)...Small diameter groove, (9)...Small end circumferential part,
(11)...Aya L Pa Figure 4

Claims (1)

[Claims] L In the manufacturing method of the two-stage V pulley, in which the two-stage pulley is manufactured from a single plate, the two V grooves are separately molded and processed. 'The spacing between the circumferential parts is relatively large, and the circumferential parts are opened and tilted slightly toward the larger diameter V groove side from the horizontal direction, so that the outer circumferential part is shaped like a dog V groove. A manufacturing method for a two-stage V pulley.