JPH02513Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a drive belt for a belt-driven continuously variable transmission.

(Prior art) Conventionally, in a belt-driven continuously variable transmission, a carrier formed by stacking endless metal bands in multiple layers,
A drive belt is formed by attaching metal V-blocks in succession, and this drive belt is wrapped around two V-shaped belt wheels, and by driving one V-shaped belt wheel, it is possible to drive the other V-belt wheel. Transmits torque. In this manner, when the continuously variable transmission is operating, the V-block of the drive belt moves in contact with the partially conical drive surface forming the V-groove of the V-shaped belt wheel, and the carrier moves along the V-shaped belt. The structure is such that it does not come into contact with cars.

Next, a conventional belt-driven continuously variable transmission will be described. In FIGS. 1 and 2, a V-shaped belt pulley 1 on the drive side includes a fixed pulley 2 having a partially conical drive surface 2a, There is a movable pulley 3 having the same partially conical driving surface 3a as this pulley 2, and both pulleys 2 and 3 have respective driving surfaces 2a,
3a are opposed to form a V-groove 4, and are attached to a rotating shaft 5. The movable pulley 3 of the V-type belt pulley 1 is moved along the axis of the rotating shaft 5 by hydraulic means or the like, so that the width of the V-groove 4 can be changed. The V-type belt pulley 6 on the driven side has substantially the same shape as the V-type belt pulley 1 on the drive side, and has a rotating shaft 7 attached to its axial center. The drive bell 8, which is hung between the V groove 4 of the V-type belt pulley 1 and the V-groove (not shown) of the V-type belt pulley 6, has a very thin endless metal band (hereinafter also referred to as a hoop) 9a, It is constructed by successively attaching metal V-blocks 10 having a predetermined thickness to a pair of carriers 9, 9 formed by stacking layers 9b, . . . , 9n.

Here, the V block 10 has a tapered side surface 11
a, 11a, and this main body 1
1, a square bar-shaped connecting portion 12 protruding upward perpendicularly to the upper surface from the center of the upper surface of the connecting portion 12;
It consists of a support part formed parallel to the upper surface of the main body part 11 at the upper end. The V-block 10 has main body parts 11 on both sides of the connection part 12.
A pair of carrier grooves 14, 14 are formed between the upper surface and the lower surface of the support portion 13. Further, the taper angle formed by the side surfaces 11a, 11a of the V block 10 is approximately the same as the taper angle of the V groove 4 of the mold belt pulley 1. This V block 10 is attached to the pair of carriers 9, 9 by fitting the carrier grooves 14, 14 on both sides into the pair of carriers 9, 9.
In this way, when the V blocks 10 are successively attached to both carriers 9, 9, the drive belt 8 is formed.

When the V-type belt pulley 1 rotates clockwise, each block 10 of the drive belt 8 hangs from the V-type belt pulley 1 to the V-type belt pulley 1. Continuously extruded V
The torque is transmitted to the V-type belt pulley 6, and the torque is transmitted to the belt pulley 6 to rotate the belt pulley 6 in the same direction as the V-type belt pulley 1. During operation of the continuously variable transmission, if the width of the V groove 4 of the V type belt pulley 1 and the width of the V groove of the V type belt pulley 6 are changed, the V type belt pulley 1
The radius of rotation of the V-block 10 in contact with the V-block 10 within the rotary shaft 7 changes relative to the rotation speed of the rotary shaft 5.
The rotation speed changes.

(Problem to be solved by the invention) However, in the conventional V-block 10, the carrier groove 14 has a houb contacting surface 14a formed in the shape of a medium-high drum in order to position the carrier 9 in the center thereof. In spite of this, the carrier 9 of the drive belt 8 may be misaligned during the operation of the continuously variable transmission, and the side of the carrier 9 may come into contact with the side of the connecting portion 12 of the V-block 10. For this reason, scratches were generated on the sides of the carrier 9, and depending on how the scratches progressed, the carrier 9 could break.

In view of the above, this idea was developed by moving the carrier from the connection part of the V block to the side of the V pulley, which has excellent surface roughness, during operation of the continuously variable transmission, thereby damaging the end of the carrier on the connection part side. It is an object of the present invention to provide a drive belt that can prevent the occurrence of such problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a pair of carriers formed of multiple layers of endless hoops, and a main body having tapered side surfaces. A continuously variable transmission drive consisting of a number of V blocks successively attached to the carrier via a pair of carrier grooves formed on both sides of a protruding connection part, and wound around a pair of V-shaped belt pulleys. The belt is characterized in that the hoop contacting surface of the carrier surface of the V-block has a convex curved surface facing upward in the width direction, and has an apex of the convex curved surface on the side surface side of the center portion. That is.

(Function) As described above, in the present invention, the hoop contact surface of the carrier surface of the V-block has a convex curved surface facing upward in the width direction, and the convex curved surface is formed on the side surface side of the center portion. By configuring it to have an apex, it is possible to prevent the carrier from moving toward the connection part of the V block, thereby preventing the carrier from being damaged due to the side surface of the carrier coming into contact with the side surface of the connection part of the V block. . Further, the tensile force applied to the carrier is maximum at the apex position, and compared to a case where the tensile force is concentrated at the corner of the carrier, the incidence of shearing of the hoop is reduced and the durability of the carrier is increased.

(Embodiment) FIG. 3 is a sectional view showing the configuration of an embodiment of the present invention.

In the same figure, the V-block 20, like the conventional V-block 10, includes a main body part 21, a connecting part 22,
It has a support part 23 and a carrier groove 24.
In this V block 20, the hoop contact surface 24a of the carrier groove 24 forms a convex curved surface facing in the width direction, and has an apex T of the convex curved surface on the side surface side rather than the center portion. That is, the hoop contact surface 24
The apex T of a is not located at the center of the hoop contact surface 24a, but is located at a position biased toward the side surface 21a of the main body portion 21. In this embodiment, when the width of the carrier 9 is b, the distance l from the side surface 21a side of the apex T is such that l≦(b/3). Of course, the ratio is not limited to this.

With this configuration, the carrier 9 in this embodiment is biased toward the side surface 21a of the main body 21 of the V-block 20 during operation of the continuously variable transmission, and the inner surface of the carrier 9 is aligned with the connecting portion 22 of the V-block 20.
Since contact with the carrier 9 is suppressed, damage to the carrier 9 can be prevented.

Furthermore, since the tensile stress applied to the carrier 9 is maximum at the apex T, the incidence of shearing of the hoop is reduced and the durability of the carrier is improved compared to when the tensile stress is concentrated at the corners of the carrier 9. Becomes large.

(Effect of the invention) As explained in detail above, the hoop contact surface of the carrier surface of the V-block has a convex curved surface facing upward in the width direction, and the convex curved surface is on the side surface side from the center part. By suppressing the carrier from moving toward the connection part of the V block, the carrier is prevented from being damaged due to the side surface of the carrier coming into contact with the side surface of the connection part of the V block. can. Further, the tensile force applied to the carrier is maximum at the apex position, and compared to a case where the tensile force is concentrated at the corner of the carrier, the incidence of shearing of the hoop is reduced and the durability of the carrier is increased.

[Brief explanation of drawings]

FIG. 1 is a front view showing the main parts of a conventional belt-driven continuously variable transmission, FIG. 2 is an enlarged cross-sectional view taken along the line - - in FIG. 1, and FIG. It is a sectional view shown in correspondence with the figure. 1...V type belt wheel, 4...V groove, 6...V
Type belt wheel, 8... Drive belt, 9... Carrier, 9a, 9b, 9n... Hoop, 20... V block, 21... Main body, 21a... Side, 22
... Connection portion, 24 ... Carrier groove, 24a ... Hoop contact surface.

Claims (1)

[Claims for Utility Model Registration] A pair of carriers formed by multiple layers of endless hoops, and a pair of carriers formed on both sides of a connecting part that protrudes upward from the center of the top surface of a main body having tapered side surfaces. consisting of a number of V blocks successively attached to the carrier via grooves,
A drive belt for a continuously variable transmission that is wound around a pair of V-shaped belt wheels, wherein a hoop contact surface on a carrier surface of the V block has a convex curved surface facing upward in the width direction,
A drive belt for a continuously variable transmission, characterized in that the apex of the convex curved surface is located closer to the side than the center thereof.