JPS592344Y2 - Belt block structure of drive belt for continuously variable transmission - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a belt block constituting a drive belt of a belt-driven continuously variable transmission.

Conventionally, in a belt-driven continuously variable transmission, a carrier made of a multilayer structure of endless metal bands is attached to a metal force member (hereinafter referred to as a belt block).

) are attached continuously to form a drive belt, and this drive belt is wound between two ■-shaped belt wheels, and one of the ■
Torque is transmitted from the type belt wheel to the other type belt wheel.

When the continuously variable transmission is operated, the belt block of the drive belt moves in contact with the partially conical driving surface forming the ■ groove of the ■ type belt wheel, and the carrier comes into contact with the driving surface of the ■ type belt wheel. The structure is such that they do not touch each other.

Next, to explain the conventional belt-driven continuously variable transmission, in Figures 1 and 2, the ■-type belt wheel 1 on the drive side
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 their respective driving surfaces 2a and 3a facing each other to form a groove 4, and a rotating shaft 5. It is attached.

The movable pulley 3 is pressed in the direction of the fixed pulley 2 on the axis of the rotary shaft 5 by means such as hydraulic pressure.

The driven-side square-shaped belt pulley 6 has approximately the same shape as the drive-side square-shaped belt pulley 1, and has a rotating shaft 7 attached to its axial center.

■ Groove 4 of ■ type belt pulley 1 and ■ groove of V type belt pulley 6 (not shown).

) is a very thin endless metal band 9a.

It is constructed by sequentially attaching a large number of belt blocks 30 each having a predetermined thickness to a pair of carriers 9, 9 formed by stacking layers 9b, 9C to 9j.

Here, the belt block 30 has a tapered side surface 31 a
, 31 a, a square rod-shaped connecting portion 32 that protrudes upward from the center of the upper surface 31 b of the main body portion 31 perpendicularly to the upper surface 31 b, and this connecting portion 32
It consists of a support part 33 formed at the upper end parallel to the upper surface 31b of the main body part 31.

The belt block 30 has on both sides of the connecting portion 32,
A pair of carrier grooves 34, 34 are formed between the upper surface 31b of the main body portion 31 and the lower surface of the support portion 33.

Further, the taper angle of the side surfaces 31a, 31a of the belt block 30 is approximately the same as the taper angle of the V groove 4 of the ■-shaped belt pulley 1.

The belt block 30 has carrier grooves 34 on both sides.
34 is attached to the pair of carriers 9, 9 by inserting it into the carriers 9, 9.

In this way, a drive bell 1-8 is formed by successively attaching a large number of belt blocks 3G to both carriers 9,9.

When the ■-type belt wheel 1 rotates clockwise, the driving bell l-8, which is hung between the V-type bell I wheel 1 and the ■-type belt wheel 6, moves to the drive bell river 8. Each belt block 30 is continuously pushed out from the ■-shaped belt pulley 1 and reaches the ■-shaped bells 1 to 6, and transmits the 1-7L force to the bell l-wheel 6 to move the bell I and wheel 6 to the ■-shaped Rotate bell) and ton 1 in the same direction.

Here, while the V-shaped belt pulley 1 is rotating, hydraulic pressure or the like acts on the movable pulley 3, so the movable pulley 3 is pushed toward the fixed pulley 2.

For this reason, the belt block 30 has both sides 31 a,
31a is pressed by the drive surface 2a of the fixed pulley 2 and the drive surface 3a of the movable pulley 3, and is pushed out in the radial direction of both pulleys 2 and 3.

On the other hand, since both carrier grooves 34 and 34 of the belt block 30 have carriers 9 and ′, respectively, the belt block 3
0, the upper surface 31b of the main body 31 is pushed down by the carrier 9.9.

Then, if the force pushing the belt block 30 of the movable pulley 3 is P, and the forces pushing down the belt block 7 by the canoes 9, 9 are Q, Q, then the pushing force P of the movable pulley 3 pushes out the belt block 30. Directional force and career 9
．． When the forces Q and Q pushing down the belt block 30 of 9 are balanced, both pulleys 2 and 3 of the belt block 30 stop moving in the radial direction.

At this time, both sides 31a of the belt block 30,
Stress is generated on the drive surfaces 2a and 3a of both pulleys 2 and 3 that are in contact with each other.

According to the elastic contact sieve, this stress becomes a parabolic stress distribution curve 35 as shown in FIG. There is a drawback that strong force is applied locally to the abutting portions, and the lifespan of both pulleys 2 and 3 is significantly shortened.

In view of the above, this invention does not apply strong force to specific parts of the drive surface of the two pulleys of the ■ type belt pulley.
Therefore, it is an object of the present invention to provide a belt block for a drive belt that can extend the life of the two pulleys compared to the conventional one.

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

In FIG. 3, the belt block 10 is a conventional novel).
Q: It has exactly the same external shape as Block 30.
, main body part 11. There are a connecting part 12, a supporting part 13, and a carrier groove 14.

This belt block 10 is a belt block 30.
A pair of elongated holes 15 are formed along the side surface i1a of the main body 11 from the upper surface 11b toward the surface 11C.
This is because 15 is left open.

This elongated hole 15.15 is sealed and symmetrical to the vertical center line Y-Y of the belt block 10, and the side 15 of the elongated hole 15
The wall thickness from a to the side surface 11a is t.

Then, when the compressive force P from the movable boolean 1J3 and the downward forces Q, Q from the carriers 9, 9 act on this belt block 10, as in the conventional case, the both side surfaces 11a, 11a of the belt block 10 come into contact with each other. Stress is generated on the drive surfaces 2a and 3a of both pulleys 2 and 3, as in the conventional case, but the largest force is not applied to the surface drive surfaces 2a and 3a. The central part of the hole is distorted in the direction of hole 15.15.

Therefore, the stress generated on the surface driving surfaces 2a and 3a is smoothed, resulting in a curve that is gentler than the conventional stress distribution curve 35, as shown by the line 19.

FIG. 4 shows another embodiment of the belt block.

The difference between this belt block IOA and the belt block 10 is that instead of having two holes 15 near both sides of the main body 11, both holes 15, 15 are combined and one hole 16 is formed.
This is because we have established the following.

This belt block 10A- also smoothes the stress generated on both side surfaces 11a, 11a for the same reason as the belt block 10.

FIG. 5 shows another embodiment of the belt block.

This belt block IOB has a pair of recesses 1 in the main body 11.
7.17 are provided symmetrically on the left and right.

By providing this recess 17, the main body 11
A protruding portion 1B is formed on the back surface of the holder.

By providing the convex portions 18.18, this belt block IOB can smooth the stress distribution generated on the side surfaces 11a and lla.

Note that the convex portion 1B of the belt block IOB is similar to the concave portion 17 of the next belt block IOB after this belt block 10B.
It is now possible to output smoothly.

As mentioned above, this idea was developed by providing holes in the main body of the belt block of the drive belt for a continuously variable transmission to smooth out the stress generated on the side of the main body.
Since the stress generated on the contact surface between the pulley of the type belt pulley and the belt block can be smoothed, an extremely large force will not be applied to the contact surface of the pulley, and the life of the pulley can be extended compared to the conventional method.

Furthermore, even if there is some variation in the manufacturing accuracy of the side surfaces of the belt block, the variation can be absorbed, so that the manufacturing accuracy of the belt block can be lowered.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional continuously variable transmission, Fig. 2 is a sectional view taken along the line ■■-■I of Fig. 1, Figs. 3 to 6 show examples of this invention, and Fig. 3 is a diagram corresponding to FIG. 2 of Example Ⅰ,
FIG. 4 is a front view of the belt block of the second embodiment, FIG. 5 is a perspective view of the belt block of the third embodiment, and FIG.
It is a sectional view taken along the line VI-VI in the figure. 1...■ type belt wheel, 2a, 3a...
Drive surface, 4...■Groove, 6...V-type belt pulley, 8...Drive belt, 9...Carrier, 9a, 9b-9j. ...Endless metal band, 10
．． IOA, IOB・・・Belt block, 1
1... Main body, 11 a... Side, 1
4...Carrier groove, 15, 16...(
stress relief) hole, 17... recess.

Claims (1)

[Scope of utility model registration request] A carrier formed by stacking endless metal bands in multiple layers, and a large number of belts that include a main body portion and a carrier groove, and are continuously attached to the carrier so as to be movable in the circumferential direction of the carrier via the carrier groove. The side surface of the main body of the belt block, which is wrapped around a pair of ■-shaped belt wheels, comes into contact with the drive surface forming the V-groove of the ■-shaped belt wheels, thereby transmitting torque between the two ■-shaped belt wheels. A belt block structure for a drive belt for a step-change transmission, characterized in that the belt block is provided with holes for smoothing stress generated when the side surface of the main body of the belt block comes into contact with the drive surface of a type belt sheave.