JPS6315631Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an endless metal belt used as a drive belt of a belt-type continuously variable transmission.

The endless metal belt used in this type of drive belt is attached to a large number of laminated block bodies constituting the drive belt and rotates as a multilayer structure, so the endless metal belt itself is made of thin layers. Must be constructed into a board. Therefore, in order to prevent breakage accidents during rotation, the conventional method was to gradually expand the pipe-shaped metal body from the inner surface, finish it to a specified size, and construct a multilayer belt by adjusting the inner diameter of each individual body. Ta. However, when using such a method, although dimensional accuracy is good, mass productivity is poor and costs are inevitably high.

For this purpose, a thin metal plate rolled to a predetermined thickness is cut into strips having a predetermined width and length to be used as a metal belt, and the cut ends of the strip metal thin plate are butted against each other at the abutting points. By applying electron beam welding or laser beam welding to
A method of constructing a desired endless shape has also been carried out.
However, when using this method, as shown in FIG.
Thermal energy is concentrated at the welding end portion 2b, and that portion of the plate to be welded is worn away, resulting in a concave notch 3. When an endless metal belt having such notches 3 is used, internal stress is concentrated at the three notches during rotation of the drive belt, causing a breakage accident starting from the notches 3.

Therefore, as shown in FIG.
A solution method has been adopted in which, as shown in FIG. 2B, a notch 3 caused by welding is created in the preliminary allowance 4, and then the preliminary allowance 4 where the notch 3 has been formed is cut off. However, since the endless metal belt to which such a solution has been applied is made to have the same width including the welded parts at both ends of the thin metal plate 1 as shown in FIG. 4 and the preliminary allowance 4 must be cut after welding, which has the disadvantage that the yield of material is very poor and mass productivity is also poor.

The present invention was devised in view of the shortcomings of the conventional endless metal belts, and the present invention was developed in view of the shortcomings of the conventional endless metal belts. The above-mentioned various drawbacks are effectively solved by creating a structure in which cutting is performed along a gentle line from the front and back in the longitudinal direction to a depth at which the notch is removed.

In other words, since the depth of the notch created by welding is approximately 0.5 mm at maximum, even if the notch is partially cut compared to the overall predetermined width dimension, the rotation during driving will be reduced. The endless metal belt according to the present invention was devised by focusing on the material engineering problem of being able to withstand strength.As shown in FIG. By butting the ends together and welding the butt points 2, a grooved notch 3 is formed at the welding start part 2a and the welding end part 2b, with the notch 3 as the center as shown in FIG. The cutting width is gradually widened along a gentle line from the front and rear of the longitudinal direction of the thin metal plate 1 to the depth of the notch 3, and cutting is performed until the concave portion of the notch 3 is completely removed. . Incidentally, in such cutting, a method is adopted in which the endless cylindrical shape is rotated at a gentle speed and cut with, for example, a rotary grindstone, so that the dimensional accuracy is high.

The endless metal belt with the notch 3 cut by this method has a short width part formed in one part, but when considered from the overall predetermined width dimension, there is no problem in terms of material strength, and on the contrary, internal stress is reduced. By completely removing the notch 3 which could cause a breakage accident due to concentration of the metal, the function of the endless metal belt as a drive belt is strengthened.

Therefore, although the endless metal belt according to the present invention has a slightly shorter width in a part of the overall predetermined width, it does not affect the strength, so it is different from the conventional one. Compared to belts that have a reserve margin, such as endless metal belts, the overall material yield is significantly improved, and in particular, it eliminates the need to form a reserve margin and cut the reserve margin, which improves mass production. It will be extremely superior in terms of

[Brief description of the drawings]

Figure 1 is a perspective view of the main parts showing the notches created at the welding start and end parts due to butt welding of thin metal plates, and Figures 2A, B, and C are main parts showing in order the conventional processing method for endless metal belts. FIG. 3 is a perspective view of a main part showing a method of processing an endless metal belt according to the present invention. 1...Thin metal plate, 2...Butting point, 2a...
...Welding start part, 2b...Welding end part, 3...Notch.

Claims (1)

[Scope of utility model registration request] In an endless metal belt obtained by butt-welding both ends of a band-shaped metal plate having a constant width, the belt-shaped metal plate is longitudinally longitudinally centered around the notches created by the welding at the welding start part and welding end part. An endless metal belt characterized by being cut in a gentle line to a depth that removes the notch.