JPS58159936A - Manufacture of endless metallic belt for belt driving type stepless speed change device - Google Patents

Abstract

PURPOSE:To enable stable centering by inserting an endless metallic belt to annular projections formed in circumferential direction on the outer peripheral face of a cylindrical holder having larger coefficient of thermal expansion than the belt, and making the radial section of the endless metallic belt a drumlike curved face. CONSTITUTION:A thin cylindrical endless metallic belt 16 having flat radial section is inserted in an annular curved projections 19 formed in circumferential direction of outer peripheral face of a cylindrical holder 17 having larger coefficient of thermal expansion than that of the endless metallic belt 16. Then, the holder 17 is heated and the endless metallic belt 16 is plastic deformed, and its radial section is formed to a drumlike curved face.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preparing an endless metal belt constituting a drive belt of a belt-driven continuously variable transmission.

Belt-driven continuously variable transmission (hereinafter referred to as continuously variable transmission)
As shown in FIG. 1, there is a V-shaped belt pulley 1 on the driving side and a ■-shaped belt pulley 2 on the driven side. The belts 1 and 2 made of (1) have a fixed pulley and a movable pulley. here,
Since the ■-type belt 1 and the ■-type belt 2 are substantially in the shape of a threshold, the ■-type belt 1 will be explained in FIG. 2. The VL belt pulley 1 includes a fixed pulley 4 to which a drive shaft 6 for driving the ■-type bait wheel 1 is attached, and a movable pulley 5 with a V groove 6 formed between the fixed pulley 4 and the fixed pulley 4. The distance between the movable pulley 5 and the constant pulley 4 can be changed by means such as hydraulic pressure. A drive belt 8 is hung between the V groove 6 of the V-shaped belt wheel 1 and the groove (not shown) of the V-shaped belt wheel 2 formed in this manner. Then, when the V-shaped belt pulley 1 is rotated by the drive shaft 6, the drive belt 8 is sent from the ■-shaped belt pulley 1 to the ■-shaped belt pulley 2, causing the ■-shaped belt pulley 2 to rotate (8). V-shaped be/
1/) The driven shaft 7 attached to the half 2 is rotated in the direction of the drive shaft 3. In the following, a drive belt having one carrier will be described. Here, the drive belt 8 is a plurality of extremely thick endless metal bells. 10.10! It is composed of a carrier 9 formed by laminating L, 10b, . ■ The block 11 includes a main body part 12 having both side surfaces 12JL, 12 & formed at approximately the same angle of inclination as the V groove 6 of the ■ type belt pulley 1, and this main body part 1.
2, and has a rectangular bar-shaped single horizontal guide 13.13 formed to protrude upward from both sides of the upper surface 12b. ■When the block 11 is inserted into the carrier groove 14 and the guide pins 15 are driven into the pin holes 13&, 13JL of both lateral guides 13.13 located above the carrier 9, ■the block 11 is inserted into the carrier 9. Can be attached.

When the V blocks 11 are successively attached to the carrier 9 as described above, the drive belt 8 is formed. During the operation of the continuously variable transmission, this drive belt 8 is connected to the surface of V#I6 of the V-type belt pulley 1 and to the V block 110.
Main body 120 both sides 12JL.

12L, the ■ block 11 is continuously pushed out from the ■ type belt car 1 and reaches the V5 belt car 2, and the V type belt car 2 is pushed out from the ■ type belt car 1. Rotate in the same direction as the belt pulley 1. In this case, the carrier 9 receives an attractive force from each block 11 located within both the V-shaped belt pulleys 1 and 2.

Here, since the carrier 9 itself can freely move within the carrier groove 14 of the V-block 11, during operation of the continuously variable transmission, the carrier 90 side and the V-block 110 side guide 13° 13 - The V-block 11 or the carrier 9 will be damaged. As a solution for this, as described in Kaikai Patent Publication No. 52-47158,
The upper surface 12b of the main body 12 of the V-plotter 11, which contacts the inner circumferential surface of the carrier 9 (the inner circumferential surface of the endless metal board 10), is shaped laterally in a convex shape (drum-shaped). 9 centering effect.

However, even if such measures are taken, if the tensile force applied to the carrier 9 is small, the outer layer of the endless metal belt constituting the carrier 9 will come into contact with the block 11 and be damaged. The reason for this is that each endless metal composing the carrier 9 is
10b, - = 10n, each endless metal bell) 10.10m...10H
The tension applied to the outer layer decreases as the layer approaches the outer layer.

Furthermore, each of the endless metal belts 10, 10JL...10n has a thin cylindrical shape in a free state as shown in FIG. 5, so when the tensile force applied to the carrier 9 is small, As shown in FIG.
Even if 2bK* is in close contact with each other, both ends will lift up and separate from the top surface 12b.The radius of curvature R1 of the outer circumferential surface of the innermost endless metal belt 10 is For the same reason, the radius of curvature of the outer peripheral surface of the carrier 9 becomes larger as the endless metal belt becomes the outer layer of the carrier 9.

Now, the radius of curvature of the outer peripheral surface of the endless metal belt 10a is R2,
If the radius of curvature of the outer surface of the endless metal belt 10b is R5..., then RO<R1(R4(R5...).Then, the endless metal belt in the outer layer is Stable V plotter 11C) Main unit 1
The upper surface 12bi(-h) of the drive belt 2 will not sag. This can be fully confirmed by the fact that there is no sliding path at both ends of the endless metal belt 0 of the drive belt that has been used for a long time.

In view of the above, the present invention provides a method for making an endless metal slab that can be centered sufficiently stably with respect to the convex shape on the upper surface of the main body of the block, even when the tension acting on the carrier is small. It is intended for the purpose of providing.

Next, the present invention will be explained based on embodiments shown in the drawings.

FIG. 4 shows the radial cross-sectional shape of the endless metal belt 16 produced by the method of the present invention.
is the innermost layer of the belt constituting the carrier 9m, and the radius of curvature RO of its laterally curved concave surface (inner peripheral surface) is
It is formed to have the same radius of curvature RO of the upper surface 12b of the main body 1i1112 of the block 11. The wall thickness t of this endless metal tray 6 is substantially constant on both sides and at the center.

FIG. 5 shows heating water μJ#17 used for manufacturing the endless metal belt 16. This hole finish 17 has a fixing part 1 on one side.
Cylindrical gold Ii with 8! It is a single member, and an appropriate number (four in the illustrated example) of annular protrusions 1119 are formed at predetermined intervals in the circumferential direction on its outer periphery. The radius of curvature of the cross section of this protrusion 19 (cross section in the longitudinal direction of the holder 17) is the same as the radius of curvature of the upper surface 12& of the V block 110 main body 12.
It is formed in o. The holder 17 has a coefficient of thermal expansion a1 larger than the coefficient of thermal expansion of the endless metal belt 16.

In order to manufacture the endless metal Peptide 16 shown in FIG. 4 using this heating holder 17, an endless metal belt 160 material 20 (with an uncurved 1llr surface) as shown in FIG. Thereafter, an endless metal band or beam is inserted onto each protrusion 19.Then, the holder 17t is heated in a heat treatment chamber (not shown).The heat Wa of the holder 17
Since the S number a1 is larger than the thermal expansion gA of the endless metal strip 20 by several towns, as the temperature rises, the endless metal strip 20 is subjected to tension from the inner circumferential side by the small rudder 170 and the protrusion 19, and the protrusion 1
9 Il! It is curved in a shape that follows 1iiK. In this way, when heat and tension are applied to the endless metal band 20, the cross section of the endless metal band 20 in the radial direction undergoes permanent deformation and becomes a drum-shaped endless metal belt 16. Therefore, after cooling the holder 17, the endless metal belt 16 can be removed from the holder 17.

The radius of curvature of each protrusion 19 is Ro+t.

By heating the endless metal belt of the holder 17, which is Ro+2t, . . . , an endless metal belt of each layer constituting the carrier 9A (see FIG. 5) can be formed. The endless metal belt thus formed was 16
! L, 16b, . . . 16n, the carrier 9m formed by stacking 16.16t, 16b, -16n is an endless metal board w) whose inner periphery changes during operation of the continuously variable transmission. Even in a field where the force acting on the part is small, each endless metal bell) 16, 16416b, ... has its entire inner periphery attached to the outer periphery of the #0 endless metal belt inside the belt. Then, the upper surface 12bKm of the main body 12 (bell) 110 can be sufficiently centered.

As described above, this invention provides a thin-walled cylindrical endless metal band having a flat cross section in the radial direction. When the holder is heated, the endless metal strip is plastically deformed and its radial cross section is formed into a drum-shaped curved surface. By manufacturing the endless metal belt that constitutes the carrier of the drive-type non-transmission transmission, we realized that the radial cross-section of the convex shape formed on the upper surface of the main body of the V-block all the way around the entire circumference. Since the radius of curvature of the outer surface can be made larger and similar to the radius of curvature of Oka-1 or this curvature, it is possible to have a radius of curvature similar to that of Oka-1. , 2) It is possible to easily and stably produce an endless metal sheet that heats up by being centered on the upper surface of the main body of the block in a good condition.

[Brief explanation of the drawing]

Figure 1 is a schematic front view of a conventional vehicle drive type continuously variable transmission.
FIG. 2 is an enlarged cross-sectional view taken along line 1-1 in FIG. 1, FIG. 5 is a radial cross-sectional view of the endless metal belt shown in FIG. 2, and FIG. 7m! 5Ii1 is a front view showing a partial cross section of the holder for manufacturing the endless metal belt shown in FIG. 4, and FIG. FIG. 2 is a radial cross-sectional view of an endless metal strip that is a raw material for the endless metal tape of the invention. 1.2...V-type belt pulley 9mm...Carrier 16, 161L, 16b, -16n-endless metal plate)
vto17--holder 19--button
Part 20... Endless metal band Applicant: Toyota Motor Corporation representative Patent attorney Oka 1) Hidehiko Figure 1 Figure 2 (!l Figure 3 Figure 41! I Figure 5 Figure 6

Claims (1)

[Claims] A thin daily coin-shaped endless metal band whose new surface in the middle diameter direction is flat is formed in the circumferential direction of the outer peripheral surface of a cylindrical holder having a coefficient of thermal expansion larger than that of the endless metal band. A belt-driven stepless belt drive type stepless metal belt which is fitted into an annular curved protrusion, heats the holder, and plasticizes the endless metal band so that its radial cross section is formed into a drum-shaped curved surface. A method of manufacturing an endless metal belt for delivery machines.