JPH04162933A - Manufacture of v-pulley - Google Patents

Abstract

PURPOSE:To easily manufacture a V pulley applicable to several kinds of V belts, large and small, by welding a pair of two circular plates concentrically on an axial body and forcing an inverted V-shaped rotary roll between the circular plates to form the V pulley. CONSTITUTION:The axial body 1 is inserted into holes of two doughnut shaped circular plates 2, 2' and the circular plates are welded to the axial body 1. When a rotary roll 3 having an inverted V-shaped cross section is inserted forcedly between the circular plates 2, 2' from the outer peripheral direction to the axial direction, the circular plates 2, 2' are opened forcedly in a V-shaped angle of the rotary roll 3 and deformed plastically to form a V groove A. Consequently, it is possible to manufacture the V pulley with a small number of dies, without correcting and finishing the V groove A and inexpensively.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to (1) a method for manufacturing a pulley;

(Conventional technology) Conventionally, pulley manufacturing methods include casting, die-casting, or press-forming.Casting and die-casting are finished by cutting, and press-forming involves pressing two discs together. This was a manufacturing method in which a groove was formed by molding and welding the two pieces together.

(Problems to be Solved by the Invention) In the conventional (1) pulley mentioned above, first of all, in the case of casting, a wooden mold is required, uneven thickness occurs during casting, the dynamic balance is poor, and furthermore, it is difficult to use in the foundry. Due to the extremely poor working environment, the number of employees has been severe in recent years, resulting in a chronic labor shortage, resulting in a decline in productivity and a rise in the price of cast metal products.Therefore, there is a tendency for the benefits of using cast metal pulleys to disappear. . Next, in the case of aluminum die casting, although it is advantageous for mass production, it requires expensive drawing dies, and the resulting product is softer than iron.
When used in a drive system with large transmission, it is subject to severe wear and slippage, making it particularly unsuitable for use in automobiles, agricultural machinery, etc. In particular, these casting and aluminum die-casting methods cannot be used as they are and require mechanical finishing, which increases labor and cost. In addition, the press forming method generates distortion due to heat because it is welded later, requires machining and rehoming to remove runout, and requires a mold every time the pulley dimensions change. there was.

The present invention aims to solve the problems mentioned above. 5. In other words, it eliminates the need for manufacturing equipment such as expensive molds and subsequent machining, and improves dynamic balance. The purpose is to provide

(Means for Solving the Problems) Means for solving the above problems will be explained with reference to figures corresponding to the embodiments.2 In the present invention, on the outer periphery of the shaft body (1) of a cylinder or a round bar, A small pair of donut-shaped hollow disks (2) 12°) are welded concentrically to the shaft (1), and then rotated around the shaft (1), A rotating roll (3) having an inverted V-shaped cross section is attached to the disc (2).
This is a manufacturing method in which the discs (2) and (2'1) are pushed in from the outer radial direction toward the axial center, and the discs (2) and (2'1) are opened in a V-shape.

(Function) A pair of discs (2 discs) concentrically welded to the outer periphery of the shaft (11)
21i2') is rotated around the shaft body (1), and on that day, a rotating roll (3) with an inverted V-shaped cross section is pushed between i(2+ and (2'l) from the outer radial direction toward the axial center. Then, while the rotary roll (3) is also rotated by the disc (21 (2M), the discs (2), (2
') is pushed open left and right and plastically deformed to form ■ groove (A). At this time, by adjusting the amount of push of the rotating roll (3), the relationship between the depth and width of the groove (A), or the size of the V groove (A), can be freely changed. roll(
In 3), it is possible to manufacture several types of V-pulleys with different sizes of grooves (A). In addition, since the rotating roll (3) rotates, even if it presses strongly against the discs (2+, (2')), there is no local wear (the wear is distributed over a wide range of the entire circumference, and the degree of wear is extremely reduced). .

(Example) Embodiments of the present invention will be described below with reference to the drawings.

First, prepare a cylindrical or round rod shaft (1) and two donut-shaped disks (2+, (2'). These two disks f2), (2') are usually As shown in the diagram, thickness, outer diameter,
and the inner diameters of the central holes (2al, (2°a) are the same size, and the inner diameter of the holes (2al, (2'al) is slightly thicker than the outer diameter of the integral (1). , insert the shaft (1) into the holes (2a) and (2°a) of this disc (2)i2°).
Insert the disk (2) into the outer periphery of the shaft (1).

(2') are fitted concentrically at appropriate distances, and each is welded and fixed. As shown in Figure 3, the hole (2') in one disc (
The inner diameter of the hole (2a) of the other disk (2) is suitably larger than the inner diameter of the hole (2a) of the other disk (2), and the hole (2a) is formed into a substantially dish shape, and the holes (2a) are connected to each other when welding.

(Either weld both discs (2+, (2°) to the shaft (1) at the same time while in contact with the 2'al side (see Figure 3a), or weld the disc (2) to the shaft (1) ) to the disk (2°) and the disk (2°)
) may be welded.

After welding the discs (2+, (2'l) to the shaft (1), they are rotated on a lathe or a special machine with the shaft (1) as the center to form a rotating roll (with an inverted V-shaped cross section) as shown in Figure 4. 3) as circle i (2+
, l: 2'l, the discs (2+, (2') are pushed open to the V-shaped angle of the rotating roll (3) and plastically deformed. A groove (A) is formed. In this case, the discs (2+, (2') are made of steel plate, especially a finished steel plate. The V angle of (3) is set to be larger than the applicable ■angle of the belt (4), taking into account springback.Also, as shown in Fig. 5, the rotating roll (
An abutment * (3a) is formed at the inverted V-shaped base of 3),
By pressing the outer circumferential tip of the disk (21, (2'l) up to the abutting groove (3a), the outer circumferential tip is bent outward or the corner etch is rounded at the same time as the groove (A) is formed. The above V-pulley is for one pulley, but in the case of two or more pulleys, a pair of discs (2+, (
Two or more pairs of 2'1 may be provided on the shaft (1) and processed in the same manner as described above.

(Effect of the invention) The present invention has the following effects.

■Compared to aluminum die-casting and press molding, fewer molds are required, and a simple and inexpensive mold for punching or drawing a disc (2+, (2'l) is sufficient. It does not require any finishing work and can therefore be manufactured at low cost.

■The V-groove (A) is formed by the rotating roll (3), so you can freely change the size of the groove (A,) by simply changing the amount of pushing, and - the same angle with the rotating rolls (3). It is possible to manufacture V-pulleys that can be applied to belts (4) of several sizes.

■ For discs (2+, (2'l), finished steel plates with uniform plate thickness can be used, and after welding, V-grooves (Al processed) are used.
The groove (A) is formed into a disk (2).

Since the V-groove (A) is formed by rotating the V-groove (A) and pushing it in with the rotating roll (3), even if there is thermal distortion due to welding.
There is no eccentricity at all, the dynamic balance when rotating is extremely good, and there is almost no runout.

■By using a rotating roll (3) with a butting groove (3a), it is possible to form the ■groove (A) of the disc (2+12°) and at the same time bend the outer periphery outward and chamfer it. The finish is good, and the belt can be hung safely and easily.

[Brief explanation of drawings]

Fig. 1 shows the first embodiment of the present invention. Fig. 2 is a cross-sectional view of the pulley. Fig. 2 is a perspective view of the disc. Fig. 3 is a diagram of the mounting state of the disc during welding. Fig. 4 is a diagram of the groove. Explanatory diagram showing the processing method, No. 5
This is a cross-sectional view showing the machining of the outer periphery of the disc. (1)...Shaft body (2), (2゛l...Disc (A
')...■Groove (3)...Rotating roll (3a
)...above the abutting groove

Claims (1)

[Claims] 1) On the outer periphery of the cylindrical or round rod shaft (1), at least two paired donut-shaped discs (2) (2') are arranged concentrically with the shaft (1). Then, while rotating around the shaft (1), a rotating roll (with an inverted V-shaped cross section)
3) between the disks (2) and (2') from the outer radial direction toward the axial center, opening the disks (2) and (2') in a V-shape to form a V groove (A ) A method for manufacturing a V-pulley. 2) An abutment groove (3) is formed in the V-shaped base of the rotating roll (3).
The method for manufacturing a V-pulley according to claim 1, wherein the abutting groove (3a) is pressed up to the outer periphery of the disc (2), (2').