JP3189716B2 - V-belt for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a V-belt which transmits power by being wound around a conical pulley of a continuously variable transmission.

[0002]

2. Description of the Related Art As a conventional V-belt for a continuously variable transmission, for example, the one disclosed in Japanese Utility Model Laid-Open No. 63-72347 is known.

[0003] As shown in Figs. 8 to 11, a V-belt 1 is formed by laminating a plurality of endless rings 3a to 3n. ) And a pair of conical input pulleys 11 connected to an engine or the like, and also connected to a drive shaft. The input / output pulleys 11 and 12 are wound around a pair of conical output pulleys 12. The input / output pulleys 11 and 12 are configured to have variable V-shaped groove widths. The ratio is continuously changed.

[0004] Elements 2 constituting the V-belt 1 include:
The inclined end surfaces 5 and 5 that frictionally contact the V-shaped grooves of the input / output pulleys 11 and 12 are formed with a tapered inclined surface 6 and a locking edge 7 in the lower half of the front surface. When the elements 2 and 2 contact and bend, the V-belt 1 can be wound around the conical pulley.

[0005] A columnar projection 8 is protruded from the upper half of the front surface of the element 2, and is fitted with a hole 9 having a circular cross section formed on the rear surface of the preceding element 2 adjacent thereto. In the width direction between the adjacent elements 2 and 2 (FIG. 9)
(Left and right directions) are restricted from each other, so that a large number of elements 2 can run in a straight line even when traveling between the input pulley 11 and the output pulley 12. In FIG. 11, the traveling direction of the V-belt 1 (the right direction in FIG. 10) is the front surface of the element 2.

[0006]

However, in such a conventional V-belt for a continuously variable transmission, as shown in FIG. 12 and FIG. Even if an attempt is made to assemble the element 2 as small as possible, the cylindrical projection 8 formed in the upper half of the front surface of the element 2 projects beyond the plate thickness of the element 2. Part 8
And the holes 9 are fitted to each other and sequentially assembled, a gap approximately twice as high as the height of the projection 8 is required to assemble the last one element 2. A small initial gap Cs between them remains.

Therefore, when the V-belt 1 is wound around the input / output pulleys 11 and 12, tension is applied to the lamination ring 3, and the lamination ring 3 is subjected to tension. V-belt 1 and input / output pulley 1
There is a problem in that slippage occurs between the V-belt 1 and the V-belt 1, which lowers the power transmission efficiency and the durability of the V-belt 1.

SUMMARY OF THE INVENTION An object of the present invention is to provide a V-belt for a continuously variable transmission capable of reducing an initial gap generated when assembling the V-belt and reliably suppressing slippage of the V-belt.

[0009]

According to a first aspect of the present invention, there is provided a laminated ring formed by laminating a plurality of endless rings, and the laminated rings are arranged so as to be in contact with each other in a circumferential direction of the laminated rings. A large number of V-shaped elements, an inclined surface formed on the inner peripheral side of the front surface of each of these elements and having a reduced thickness, and a rear surface side of an adjacent element formed at the start position of the inclined surface. A V-belt for a continuously variable transmission, which is wound around a pulley by relatively bending adjacent elements, with at least one locking edge provided on the front side of each element. A V-belt for a continuously variable transmission in which a columnar projection is provided on the rear surface side with a hole that fits with the columnar projection, and the position in the width direction of the element is regulated with respect to each other. Tip shape of protrusion , Together with the projection height toward the inner peripheral side of the element is formed on the inclined surface decreases, the error
The angle θ1 of the inclined surface of the columnar projection of the element is V
Between adjacent elements when the
The relative bending angle was θ2, and the V belt was bent to the minimum radius of curvature.
When the relative bending angle between adjacent elements at the time is θ3,
θ2 ≦ θ1 ≦ θ3 .

[0010]

According to a second aspect of the present invention, there is provided a laminated ring formed by laminating a plurality of endless rings, and a plurality of V-shaped rings arranged so as to be able to contact each other in the circumferential direction of the laminated ring. An element, an inclined surface formed on the inner peripheral side of the front surface of each of these elements and having a reduced thickness, and a locking edge formed at a start position of the inclined surface and capable of contacting the rear surface side of the adjacent element. In a V-belt for a continuously variable transmission that is wound around a pulley by relatively bending adjacent elements, among the elements, at least one or more columnar projections are provided on the front side of the V-belt.
A large number of first elements having holes that fit with the projections are disposed on the rear surface side, and the tip shape of the columnar projections is inclined such that the height of the projections decreases toward the inner peripheral side of the element. At least one or more second elements formed on the surface were disposed between the multiple first elements.

A third invention is the second invention, wherein the second
The elements were arranged adjacent to at least two or more between a number of first elements.

According to a fourth aspect of the present invention, in the second or third aspect, the angle θ1 of the inclined surface of the columnar projection of the second element is such that adjacent elements when the V-belt is in a substantially perfect circle state are adjacent to each other. Θ2 ≦ θ1 ≦ θ3, where θ2 is the relative bending angle and θ3 is the relative bending angle between adjacent elements when the V-belt is bent to the minimum radius of curvature.

[0014]

[0015]

Effect of the Invention] Thus, according to the first aspect, the distal end shape of the pillar-shaped protrusion of the element, the projection height is formed on the inclined surface decreases toward the inner peripheral side of the element
In both cases, the angle θ1 of the inclined surface of the columnar projection of the element
Is the adjacent element when the V-belt is in a substantially perfect circular state.
The relative bending angle between the belts is θ2, and the V-belt is the minimum radius of curvature.
Θ3 is the relative bending angle between adjacent elements when bent.
By setting the relationship of θ2 ≦ θ1 ≦ θ3, it is possible to effectively reduce the gap between the protruding portion and the adjacent element when the adjacent elements are bent. Therefore, the initial gap at the time of assembling the V-belt can be effectively reduced, the slip between the V-belt and the pulley caused by the initial gap can be suppressed, and the power transmission efficiency and the durability of the V-belt can be improved.

[0016]

According to the second aspect of the present invention, the tip of the columnar projection is formed on the inclined surface whose projection height decreases toward the inner peripheral side of the element, between the plurality of first elements. By arranging at least one or two elements, it is possible to reduce the initial gap at the time of assembling the V-belt even if the V-belt is mostly composed of the conventional first element.

According to the third aspect of the present invention, by arranging two or more second elements adjacent to each other between a number of first elements, the initial gap in assembling the V-belt can be efficiently reduced. Can be.

According to the fourth aspect, the angle θ1 of the inclined surface of the columnar projection of the second element is set to θ2, and the relative bending angle between the adjacent elements when the V-belt is substantially in a perfect circle is set to θ2. When the relative bending angle between adjacent elements when the V-belt is bent to the minimum radius of curvature is θ3, θ2 ≦
By setting the relationship of θ1 ≦ θ3, it is possible to effectively reduce the gap between the protrusion and the adjacent element when the adjacent element is bent.

[0020]

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first example of a V-belt for a continuously variable transmission.
The V-belt 1 is configured such that a plurality of endless rings 3a to 3n are stacked, and the V-belt 1 can abut on each other in the longitudinal direction (circumferential direction) of the stacked ring 3. And a large number of V-shaped elements 20 arranged in series.

The V-belt 1 is wound around an input pulley 11 and an output pulley 12, as shown in FIG. 11, and constitutes a continuously variable transmission that transmits power while continuously changing a gear ratio. .

In the element 20 constituting the V-belt 1, inclined end surfaces 5 and 5 that frictionally contact the V-shaped grooves of the input / output pulleys 11 and 12 are formed on both side surfaces in the width direction. A tapered inclined surface 6 whose plate thickness (wall thickness) decreases toward the inner peripheral side of the V-belt 1, and a locking edge 7 at a start position of the inclined surface 6 are formed.

A columnar projection 21 is projected from the upper half of the front surface of the element 20, and is fitted into a hole 9 having a circular cross section formed on the rear surface of the preceding element 20 adjacent thereto. The displacement of the adjacent elements 20 in the width direction between the adjacent elements 20 is regulated by the engagement, and the large number of elements 2
0 can travel in a straight line even when traveling between the input pulley 11 and the output pulley 12, but the cylindrical projection 21 has a tip directed toward the inner peripheral side of the element 20. As a result, it is formed in a shape cut off by an inclined surface 22 having a reduced projection height.

In FIG. 1, the left-right direction in the figure is the width direction of the element 20, and in FIG. 2, the right side in the figure is the front surface of the element 20 and is the running direction of the V-belt 1.
The same components as those in the conventional example are denoted by the same reference numerals.

Next, the operation of the V-belt 1 having such a configuration will be described.

FIGS. 3 to 5 show a state where the last element 20 # is assembled to the lamination ring 3 when the V-belt 1 is assembled.

Specifically, the plate thickness of the element 20 is 2 m
m, the maximum height t of the projection 21 is 1 mm, the diameter d of the projection 21 is 3 mm, the inclination angle θ3 of the lower half inclined surface 6 is 6 °,
And the inclination angle θ1 of the inclined surface 22 at the tip of the projection 21
The relative bending angle θ2 between the adjacent elements 20, 20 when the V-belt 1 is in a substantially circular state substantially the same as when the V-belt 1 is assembled.
(About 1 ° when the belt circumference = 700 mm) will be described as an example.

In this case, the relative bending angle α between the adjacent elements 20, 20 is θ2, and
The inclination angle θ1 of the inclined surface 22 at the tip of the projection 21 is also θ
2 which is approximately equal to 2
The distance between the inclined surface 22 at the tip of the # 21 projection 21 and the rear surface of the element 20 that has already been assembled to the lamination ring 3 and is adjacent to the element 20 # is the same as that of the projection 21 of the element 20 #. Column (projection height t = 1m
d × tan (θ2)
= 3 × tan1 ° = 0.05 mm, so that the amount of the initial gap generated when assembling the V-belt 1 is 0.05 ×
2 = 0.1 mm can be reduced.

On the other hand, when assembling the V-belt 1, it is possible to locally reduce the radius of curvature of the V-belt 1 by applying a forcing force to the V-belt 1. If the inclination angle θ3 is 6 °, the relative bending angle α between the adjacent elements 20, 20 can be increased up to 6 °.

Accordingly, the inclination angle θ1 of the inclined surface 22 at the tip of the projection 21 of the element 20 is set to the relative bending angle θ3 (6 °) between the adjacent elements 20, 20 when the V-belt 1 is bent to the minimum radius of curvature. , The inclined surface 22 at the tip of the projection 21 of the last element 20 # to be assembled.
The distance between the element 20 # and the rear surface of the element 20 which has already been assembled to the lamination ring 3 and is adjacent to the element 20 # is determined by using a conventional cylinder (projection height t = 1 mm) with the projection 21 of the element 20 #. Compared to the case of forming
d × tan (θ3) = 3 × tan6 ° = 0.3 mm, so that the amount of the initial gap generated when assembling the V-belt 1 is 0.3 × more than before and after the element 20 #. 2 = 0.6 mm can be reduced.

Therefore, by using the lamination ring 3 having a shorter circumference by this amount, the slip between the V-belt 1 and the pulley due to the initial gap generated when assembling the V-belt 1 can be suppressed, and the power transmission The efficiency and the durability of the V-belt 1 can be improved.

The projection 2 is provided on the front side of the element 20.
1, the hole 9 is formed on the rear side, but the projection 21 may be formed on the rear side of the element 20 and the hole 9 on the front side may be formed.

FIGS. 6 and 7 show a V-belt according to a second embodiment of the present invention. In the longitudinal direction (circumferential direction) of the laminated ring 3, the conventional element 2 (first element, FIGS.
0), and two elements 20 (second elements) of the first embodiment are arranged between the elements 2 so as to be adjacent to each other.

The plate thickness of the elements 2 and 20 is 2 mm, and the maximum height t of the projections 8 and 21 of the elements 2 and 20 is 1 m.
m, the diameter d of the projections 8 and 21 are 3 mm, the inclination angle θ3 of the inclined surface 6 in the lower half is 6 °, and the inclination angle θ1 of the inclined surface 22 at the tip of the projection 21 of the element 20 is V belt 1 The relative bending angle θ2 between the adjacent elements 2, 2 and 2, 20 and 20, 20 when they are made in the same perfect circle state as when assembling (about 1 ° when the belt circumference = 700 mm)
An example will be described in which the value is set to.

The relative bending angle α between the adjacent elements 2, 2 and 2, 20 and 20, 20 is the above-mentioned θ2, and the inclination angle θ1 of the inclined surface 22 at the tip of the projection 21 of the element 20 is also approximately the above-mentioned θ2. Since they are equal, the inclined surface 22 at the tip of the projection 21 of the last element 20 # to be assembled
The distance between the element 20 # and the rear surface of the element 2 which has already been assembled to the lamination ring 3 and is adjacent to the element 20 # is determined by using a conventional cylinder (projection height t = 1 mm) with the projection 21 of the element 20 #. Compared to the case of forming
d × tan (θ2) = 3 × tan1 ° = about 0.05 mm. Similarly, the distance between the inclined surface 22 of the tip of the protrusion 21 of the element 20 already attached to the lamination ring 3 and adjacent to the element 20 # and the rear surface of the element 20 # In comparison with the case where the projection 21 of # is formed by a conventional cylinder (projection height t = 1 mm), d × tan (θ2) = 3 × tan
1 ° = approximately 0.05 mm.

On the other hand, when assembling the V-belt 1, the inclination angle θ of the inclined surface 22 at the tip of the projection 21 of the element 20.
1 is set to the relative bending angle θ3 (6 °) between the adjacent elements 2, 2 and 2, 20 and 20, 20 when the V-belt 1 is bent to the minimum radius of curvature.
Before and after 0 #, the gap is d × tan (θ3) =
3 × tan6 ° = reduced by about 0.3 mm to 0.3 × 2
= 0.6 mm.

In this way, slippage between the V-belt 1 and the pulley due to the initial gap generated when assembling the V-belt 1 using the lamination ring 3 having a short circumference can be suppressed, and power transmission can be suppressed. The efficiency and the durability of the V-belt 1 can be improved, and the cost can be reduced because two elements 20 each having the tip of the protrusion 21 formed on the inclined surface 22 may be used. In addition, it is possible to increase the size of the projection 8 of the other element 2 to enhance the fitting property with the hole 9.

In this case, the projections 8 and 21 may be formed on the rear side of the elements 2 and 20, and the hole 9 may be formed on the front side.

[Brief description of the drawings]

FIG. 1 is a front view of an element of a V-belt according to a first embodiment.

FIG. 2 is a side view of an element and a laminated ring and a cross-sectional view of a hole.

FIG. 3 is an assembled state diagram of a V-belt.

FIG. 4 is a side view of the element.

FIG. 5 is a view taken in the direction of arrows AA in FIG. 3;

FIG. 6 is an assembled state diagram of a V-belt showing a second embodiment.

FIG. 7 is a side view of the element.

FIG. 8 is an overall assembled view of a conventional V-belt.

FIG. 9 is a front view of the element.

FIG. 10 is a side view of an element and a lamination ring and a cross-sectional view of a hole.

FIG. 11 is a conceptual diagram of a V-belt wound around an input / output pulley.

FIG. 12 is an assembled state diagram of a V-belt.

13 is a view as viewed in the direction of arrows BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 V belt 2 Element 3 Laminated ring 5 Inclined end surface 6 Inclined surface 7 Locking edge 8 Projection 9 Hole 11 Input pulley 12 Output pulley 20 Element 21 Projection 22 Slope

Claims (4)

(57) [Claims] 1. A laminated ring formed by laminating a plurality of endless rings, a large number of V-shaped elements arranged so as to be able to contact each other in the circumferential direction of the laminated ring, and An inclined surface formed on the inner peripheral side of the front surface of each element and having a reduced thickness, and a locking edge formed at the start position of the inclined surface and capable of contacting the rear surface side of the adjacent element, are adjacent to each other. A V-belt for a continuously variable transmission that is wound around a pulley by relatively bending elements, wherein at least one or more columnar projections are provided on the front side of each of the elements, and on the rear side. In a V-belt for a continuously variable transmission in which a hole is fitted with the hole and the position in the width direction of the element is regulated with respect to each other, the tip shape of the columnar projection of the element is Inward With projection height is formed on the inclined surface to reduce I, the angle of the inclined surface of the pillar-shaped protrusion of the element θ1
Is the adjacent element when the V-belt is almost circular
The relative bending angle between the belts is θ2, and the V-belt is the minimum radius of curvature.
Θ3 is the relative bending angle between adjacent elements when bent.
A V-belt for a continuously variable transmission, wherein a relationship of θ2 ≦ θ1 ≦ θ3 is set . 2. A method in which a plurality of endless rings are laminated.
With each other in the circumferential direction of the laminated ring
A number of V-shaped elements that are arranged so as to be accessible
Formed on the inner peripheral side of the front of each of these elements
Formed at the starting position of the inclined surface,
Locking that can contact the rear side of the adjacent element
With edges, adjacent elements are relatively
A continuously variable transmission that can be wound around a pulley by bending
In the V-belt for use , at least one or more
A pillar-shaped projection is provided on the rear side with a hole to fit the projection.
A large number of the first elements are arranged and their columnar shape
Protrude toward the inner circumference of the element.
The second element formed on the inclined surface whose elevation is reduced,
At least one or more elements are provided between a number of first elements.
A V-belt for a continuously variable transmission. 3. The method according to claim 1, wherein the second element comprises a plurality of first elements.
Contractors arranged at least two adjacent to each other
The V-belt for a continuously variable transmission according to claim 2 . 4. The method according to claim 1, wherein the columnar projections of the second element are provided.
The angle θ1 of the inclined surface assumes that the V-belt is in a substantially perfect circular state.
The relative bending angle between adjacent elements is θ2, V belt
Between adjacent elements when is bent to the minimum radius of curvature
Assuming that the relative bending angle is θ3, the relationship of θ2 ≦ θ1 ≦ θ3 is established.
The V-belt for a continuously variable transmission according to claim 2 or 3, wherein