JPH0694083A - Manufacture of block used in high load transmission belt - Google Patents

Abstract

PURPOSE:To make a block for a belt with a durable a structure and speedily simply manufacturable. CONSTITUTION:A metal plate serving as material for a block 2 constituting a high load transmission belt 1 and a part equivalent to a slot part 9 both are blanked by a press and then they are formed into almost block form by the press, and successively a lower end of a head 8 forming the slot part 9 and cross direction corner parts 9a, 9a, 9b, 9b at the upper end of a body 6 are deformed into convex curved surfaces by way of inserting two metal molds with the convex curved surfaces into the slot part 9 from both sides of the block, then shaving takes place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a block belt, and more particularly to a method of manufacturing a block used for a high load transmission belt used in a belt type speed change mechanism of vehicles such as automobiles and various machines.

[0002]

2. Description of the Related Art There are various types of continuously variable transmissions, some of which use a belt, and a belt type continuously variable transmission that changes a gear ratio by changing the width of a pulley around which the belt is wound. It is called a speed change mechanism.

An endless band made of a multi-layer steel band is inserted into the slots of a plurality of blocks and attached to the belt used in the belt type continuously variable transmission mechanism while the blocks are in contact with each other. There is a push transmission type belt having a structure in which an endless band is slidable in the longitudinal direction. For example, US Pat.
No. 720,113 and the like. This transmission system generally has a structure in which the block is not fixed to the endless band but is slidably arranged on the endless band.When the block is hung on both the driving and driven pulleys, the block is located on the loose side of the belt. This is to rotate the driven pulley by pushing the blocks gathered on the loose side of the belt from the blocks hanging on the drive pulley.

The problem of shortening the life of such a belt is the cutting of the endless band. One of the causes is that the corners of the slot portion into which the endless band is inserted are formed substantially at right angles. Therefore, when the belt is wound around the drive or driven pulley, the corners of the belt hit the endless band and the endless band is damaged.

In order to prevent the block from damaging the endless band, even if the corners of the slot portion of the block in the belt width direction are curved, the endless band is not damaged even if it comes into contact with the endless band. There is a way to In order to make the corners of the slot portion of the block in the belt width direction curved, conventionally, the block was molded and then the slot portion was polished.

[0006]

However, the conventional method of polishing to form a curved surface requires a lot of time and labor for polishing, which increases the cost of the belt and is not suitable for mass production. There was a drawback. The present invention solves the above-mentioned problems, and in a method of manufacturing a block used for a high load transmission belt of this type, a manufacturing method suitable for mass production that does not require much time and labor and is advantageous in cost. The challenge is to provide.

[0007]

In order to solve the above problems and to achieve the object, the present invention forms a head through a pillar in a main body of a block body, and forms a slot portion between the main body and the head. In a method of manufacturing a block used in a high load transmission belt in which a plurality of provided blocks are arranged in parallel with each other with a gap or in close contact with each other and an endless band is hung through a slot portion thereof, a metal as a material of the block After punching the part that hits the slot part from the plate with a press, mold it into a substantially block shape with a press, and then form a mold with concave curved corners in the block width direction at the lower end of the head and the upper end of the main body that form the slot part. It is characterized in that it is shaving after being deformed into a convex curved surface by inserting it into the slot portion from both sides of the block.

[0008]

According to the present invention, the block is first deformed by punching a portion corresponding to the slot portion from a metal plate which is a material with a press and pressing the slot portion using a die having a special shape having a concave curved surface. It can be said that shaving is performed, and the blocks are molded by pressing, not including a polishing step, which is suitable for mass production without much time and labor in each step. Further, the belt using the block obtained by the present invention has a curved slot portion and no corners, so that the belt having a long life can be obtained without damaging the endless band while the belt is running. it can.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a high load transmission belt of a push transmission type applied to the manufacturing method of the present invention. The high load transmission belt 1 shown in FIG. 1 is configured by arranging a plurality of blocks 2 slidably on an endless band 3, for example, a multi-layer steel band. Of course, the blocks 2 are arranged in close contact with each other and the endless band 3
May be pretensioned.

The block 2 includes a main body 6 having an inclined surface 5 that engages with the V pulley and abuts against the wall surface of the pulley, a pillar 7 located substantially in the center, a chevron head 8 and an endless band 3. It has a pair of slot portions 9 to hang. Further, a through hole 12 having a circular shape, an elliptical shape, a rectangular shape, a square shape, or the like is provided at a substantially central portion of the head 8 of the block, and the through hole 12 is provided between the through hole 12 and the R-shaped cutout portion 13. An oil groove 16 is arranged between the head top portion 14 and between the through hole 12 and the slot portion 9.

Lubricating oil supplied from below the block 2 in the vicinity of the driven pulley is stored in a space surrounded by the endless band 3 and the lower notches 17 at both corners of the pillar to form an oil sump, The oil groove 1 which moves from this portion to the upper notch 13 via the side wall 17 of the pillar and the end face 19 of the endless band, and is opened in the vicinity thereof by centrifugal force
It is accumulated in the through hole 12 while lubricating the head 8 while passing through 6. By passing through the oil groove 16 provided on the head top portion 14 from the through hole 12, the lubricating function is effectively exhibited.

In addition, the pillar 7 of the block body 2 is attached to the projection 1
Grooves 22 are arranged on the back surface of 5 and the same position. In the case of the block body 2 having the protrusion 15 and the groove 22, even if the block body enters the pulley and inclines and is displaced to the minimum pulley diameter, these coupling relationships are always maintained,
Further, even when the block body 2 separates from the pulley, this coupling state does not change. The positions of the protrusion 15 and the groove 22 are not limited to the pillar 7.

The front surface of the main body 6 has a tapered surface 20 whose thickness gradually decreases downward, and an inclined start line 21 at the start position of the tapered surface is in the same line as the shoulder surface 10 of the slot 9. Located on top. Generally, the tapered surface 20 enables a block body rotating on the pulley to be inclined in the traveling direction according to the curvature thereof, and the pitch line of the belt becomes a line when the block body 2 rotates on the pulley, and It becomes the slope start line 21 where the thickness starts to decrease.

The present invention provides a method of manufacturing a block used for the high load transmission belt as described above. First, as shown in FIG. 2, the block 2 is manufactured by punching a metal plate 30 by pressing. A guide hole 31 is formed in the metal plate 30, a through hole 12 serving as an oil hole and a tapered surface 20 are provided at a predetermined position determined by the guide hole 31, and subsequently an oil groove 16 and a protrusion 15 are provided, and a rear slot portion. Punch the part that hits 9,
Modeling is made slightly larger than the size of the block 2. After that, normally, the shaving process is performed so that the block has a regular size. Molds 34, 3 each having two concave curved surfaces 32, 32, 33, 33 as shown
5 is inserted into the slot portion 9 of the block 2 from both sides so as to sandwich the block, and the corner portions 9a, 9a, 9b of the slot portion 9,
It presses so that 9b may become a curved surface.

Slot portion 9 after this press working
As shown in FIG. 7, since a metal remainder C, C is formed in the central portion as shown in FIG. 7, the entire size of the block 2 is punched out in a regular size by using dies 36, 37 as shown in FIG. It is possible to manufacture a block having no corners in the slot 9 as shown in FIG. 9 by scraping it off by a shaving process to obtain a regular block size. According to the method as described above, it is possible to perform the press working without the need for polishing to make the corners of the slot 9 into a curved surface, and to significantly reduce the time and labor required for manufacturing the block. You can

[0016]

According to the method of manufacturing a block used for a high load transmission belt of the present invention, the block is first punched out of a metal plate which is a material, and a part of the slot portion is punched out, and the slot portion has a concave shape curved surface. It can be said that it is deformed by pressing and shaving afterwards, and that the molding of the block is all done by press processing without including a polishing step, and it is suitable for mass production without time and effort in each step. . Further, the belt using the block obtained by the present invention has a curved slot portion and no corners, so that the belt having a long life can be obtained without damaging the endless band while the belt is running. it can.

[Brief description of drawings]

FIG. 1 is a front sectional view of a high load transmission belt using a block to which a manufacturing method of the present invention is applied.

FIG. 2 is a rear sectional view of a high load transmission belt using a block to which the manufacturing method of the present invention is applied.

FIG. 3 is a front view showing a process after punching a slot portion in the manufacturing method of the present invention.

FIG. 4 is a front view showing the metal plate after being imprinted in the manufacturing method of the present invention.

FIG. 5 is a front view showing a state before deformation in the slot portion deforming step in the manufacturing method of the present invention.

FIG. 6 is a front view showing a state during deformation of the slot portion deforming step in the manufacturing method of the present invention.

FIG. 7 is a front view showing a state of the slot portion before the shaving step in the manufacturing method of the present invention.

FIG. 8 is a front view showing a state of the slot portion after the shaving step in the manufacturing method of the present invention.

FIG. 9 is a side view of a block manufactured by the manufacturing method of the present invention.

[Explanation of symbols]

 1 High-load transmission belt 2 Block 3 Endless band 5 Sloping surface 6 Main body 7 Pillar 8 Head 9 Slot portion 12 Through hole 13 Notch portion 15 Projection portion 16 Oil groove 17 Notch portion 20 Tapered surface 22 Groove portion 30 Metal plate 31 Guide Hole 32 Recessed curved surface 33 Recessed curved surface 34 Mold 35 Mold 36 Mold 37 Mold

Claims (1)

[Claims] 1. A head is formed on a main body of a block via a pillar, and a plurality of blocks provided with a slot portion between the main body and the head are arranged in parallel with each other with a gap or in close contact with each other. In the method of manufacturing a block used for a high-load transmission belt in which an endless band is hung through the slot part, after punching the part corresponding to the slot part from the metal plate which is the material of the block with a press, the block shape is shaped by a press. Then, the lower end of the head that forms the slot part and the lower end of the head that forms the slot part by inserting a mold having a concave curved surface at the part that contacts the corner of the upper end of the main body in the block width direction from both sides of the block. High load transmission characterized by shaving after deforming the corners of the upper end of the main body in the block width direction into convex curved surfaces. A method of manufacturing a block used for a moving belt.