JPS633182B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a V-belt transmission device that transmits power using a V-belt having a V-shaped cross section.

V-belt transmission devices used in continuously variable transmissions, etc. are suitable for transmitting large amounts of power because they can obtain greater frictional force than ordinary flat belts due to the wedge action on both inclined grooves of the pulley, but they also require large tension. Therefore, a rubber V-belt may not be able to withstand the transmitted power.

Furthermore, since the rubber V-belt is highly elastic, it has a large hysteresis loss.

There is a metal V-belt transmission device that solves this problem.

Conventionally, as shown in FIG. 2, a large number of endless thin steel belts 01 are stacked on top of each other in the thickness direction.
A metal V-belt is constructed by integrally attaching a power transmission piece 02 with a pin 03 along its longitudinal direction, or an endless thin steel plate belt 01 is attached along its longitudinal direction as shown in FIG. There was a metal V-belt constructed by integrally attaching the power transmission piece 02 with the locking parts 03 at both ends, but in the example shown in FIG. is required, which causes an increase in processing costs. Further, in the example shown in FIG. 3, the power transmission piece member 02 and the endless thin steel plate belt 0
1, it is necessary to bend the locking portions 03 at both ends, and depending on the material, bending is not easy, which poses a problem in terms of assembly and processing costs. Note that FIG. 1 shows a state in which the V-belt shown in FIGS. 2 and 3 is stretched over a driving V-pulley 04 and a driven V-pulley 05.

Further, in the conventional V belt shown in FIGS. 1 to 3, the bridge member 02 is the V pulley 04,
05, and there was a risk that the transmission efficiency would decrease or uneven wear would occur due to poor engagement with the V pulleys 04 and 05.

The present invention relates to an improvement of a V-belt transmission device that overcomes these difficulties, and aims to provide a highly durable V-belt transmission device that is easy to process and assemble, and can transmit large amounts of power reliably and efficiently. The present invention provides a V-belt transmission device.

An embodiment of the present invention illustrated in FIGS. 4 to 10 will be described below.

Reference numeral 1 denotes a continuously variable transmission for motorcycles, and in the transmission 1, each V of a drive V pulley 2 and a driven V pulley 4 is
A V-belt 6 is stretched across the grooves 3 and 5.

The V-belt 6 is made up of a large number of V-shaped metal members 7, a needle roller 12 which is an elongated roller member interposed between the same number of V-shaped metal members 7, and the same V-shaped metal member 7 and the needle roller 12. It consists of a flexible endless member 13 made by stacking a number of endless thin steel plates of a certain width to tighten the outer periphery of the connecting unit, and a rubber endless holding member 14 provided in contact with the outer peripheral surface of the flexible endless member 13. .

Both side surfaces 8 of the V-shaped metal member 7 are symmetrically inclined so as to contact the V grooves 3 and 5 of the V-pulleys 2 and 4 at a predetermined inclination angle θ. The end surfaces 9 are formed parallel to each other, and the inner front and rear end surfaces 9a have a shape extending in the width direction.
A circular arc-shaped groove 10 having a length l ₁ and a radius of curvature r ₁ is formed. A rectangular notch 11a is formed on the outer side of the V-shaped metal member 7, and an arc-shaped notch 11b is formed further on the outer side of the rectangular notch 11a. There is (1st
(See figure 0).

Further, in the needle roller 12, the circular groove 1
The length l ₂ is set shorter than the length l ₁ of zero, and the radius r ₂ is set smaller than the radius of curvature r ₁ of the circular arc-shaped groove 10.

Furthermore, as shown in FIGS. 8 and 9, the rubber endless holding member 14, which is set to a length that can contact the outer circumferential surface of the flexible endless member 13, has the V-shaped metal Arc-shaped notch 11b of member 7
Curved portions 14a, which are curved so as to protrude outward on both sides, and rectangular protruding portions 14b are alternately formed in a corresponding shape so that they can be engaged with.

Since the embodiments shown in FIGS. 4 to 10 are constructed as described above, V is directed from the inside to the outside of the flexible endless member 13 that is in close contact with the inner surface of the rubber endless holding member 14. The notch 11a of the V-shaped metal member 7 is fitted into the flexible endless member 13 by moving the metal member 7, and the needle roller 12 is engaged with the arcuate groove 10 of the V-shaped metal member 7. This is repeated over the entire circumference of the flexible endless member 13.

Next, with this flexible endless member 13 shaped into a circle, use a jig or the like to move the two V-shaped metal members 7, which sandwich the part where the needle roller 12 is not inserted, away from each other. Applying force, the last needle roller 12 is inserted into the opposing arcuate grooves 10 of both members 7.
and further the notches 1 of each V-shaped metal member 7.
The V-belt 6 is assembled by fitting the curved portion 14a of the rubber endless holding member 14 into the rubber endless holding member 1b and engaging the protruding portion 14b of the same rubber endless holding member 14 between each V-shaped metal member 7. Can be done. Note that the curved portion 14a of the rubber endless holding member 14 is fitted into the notch 11b of the V-shaped metal member 7, and the protruding portion 14 is engaged between each V-shaped metal member 7.
b, each V-shaped metal member 7 has a certain degree of tension.
It is becoming more and more common to give money to people.

Since the V-belt 6 is assembled in this way, the needle roller 1 is
2 is held in the arc-shaped groove 10 of the V-shaped metal member 7, so that the V-belt 6 is held in the V-shaped groove 10 of the V-shaped metal member 7.
Of course, when it is curved in contact with the grooves 3 and 5,
Even when located between the V pulleys 2 and 4, the needle roller 12 will not fall off.

In addition, in this embodiment, the both side surfaces 8 of the V-shaped metal member 7 whose front and rear end surfaces 9 are parallel are inclined in a V-shape, and a circular arc-shaped groove is formed on the inner front and rear surfaces 9a.
Since the V-shaped metal member 7 can be constructed, productivity is high and costs are low.

Further, in this embodiment, since the protruding portion 14b of the rubber endless holding member 14 engages with the outer front and rear end surfaces 9b of the V-shaped metal member 7, the outer both sides 7a of the adjacent V-shaped metal member 7 Even if a force F that causes the V-shaped metal members 7 to approach each other is applied, it is absorbed by the elasticity of the protrusion 14b, preventing abnormal inclination of the adjacent V-shaped metal members 7, and preventing poor engagement with the V-pulleys 2 and 4. It is possible to prevent problems such as a decrease in transmission efficiency and uneven wear caused by Further, the protrusion 14b of the rubber endless holding member 14 can also prevent the needle roller 12 from falling off.

Furthermore, in this embodiment, since the curved portion 14a of the rubber endless holding member 14 and the notch 11a of the V-shaped metal member 7 are fitted with a predetermined tightness, the V-shaped metal member 7 is It can be firmly supported by the endless holding member 14. Therefore, V
Vertical and horizontal movement of the V-shaped metal member 7 from the belt 6,
It can prevent the V-shaped metal member 7 and the needle roller 12 from falling off, and prevent the vertical and horizontal movement of the V-shaped metal member 7 and the needle roller 12.
Falling off can be more reliably prevented, and
V-shaped metal member 7 and V grooves 3, 5 of V pulleys 2, 4
By making the contact uniform, uneven wear between the two can be prevented. Since the adjacent V-shaped metal members 7 are brought into contact with each other via the needle roller 12 in the arc-shaped groove 10, the bending deformation of the V-belt 6 causes the bending of the flexible endless member 13 and the rubber endless holding member 14. The V-shaped metal member 7 is only attached to the needle roller 12.
It can be easily swung.

Furthermore, since the radius of curvature r ₁ of the arcuate groove 10 is larger than the radius r ₂ of the needle roller 12, V
The V-shaped metal member 7 and the needle roller 12 are in rolling contact, and as a result, wear and friction loss between the V-shaped metal member 7 and the needle roller 12 are small.

In the present invention, in the V belt in which a large number of V-shaped metal members are brought into contact with each other via elongated roller members, and the outer periphery of the metal members is tightened via a flexible endless member, the flexible Since the endless band-shaped elastic body that fits into the metal member is provided on the outer periphery of the endless member, the metal member can be firmly supported by the endless band-shaped elastic body, and the endless band-shaped elastic body can adjust the inclination of the metal member. can be prevented. Therefore, there is no reduction in transmission efficiency or uneven wear due to poor engagement with the V-pulley.

Further, in the present invention, the metal member can be easily processed and the number of parts can be reduced, so that productivity is high and an inexpensive V-belt can be provided.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional V-belt transmission, FIGS. 2 and 3 are cross-sectional views of a conventional power transmission piece, and FIG. 4 is an embodiment of the V-belt transmission according to the present invention. The illustrated side view, FIGS. 5 and 6 are cross-sectional views taken along the lines - and - in FIG. 4, FIG. 7 is an enlarged vertical cross-sectional view thereof, and FIG. FIG. 9 is a plan view of the endless holding member, FIG. 9 is a vertical cross-sectional view taken along the line --- in FIG. 8, and FIG. 10 is an enlarged perspective view of the main part in the same embodiment. 1... Continuously variable transmission for motorcycles, 2... Drive V pulley, 3... V groove, 4... Driven V pulley, 5... V
Groove, 6... V belt, 7... V-shaped metal member, 8... Both sides, 9... Front and rear end surfaces, 10... Circular groove, 11... Notch, 12... Needle roller, 13... Flexible endless member, 14 ...Rubber endless holding member.

Claims (1)

[Claims] 1 A large number of V-shaped metal members are brought into contact with each other via elongated roller members, and the outer periphery of the metal members is tightened via a flexible endless member.
1. A V-belt transmission device, characterized in that an endless belt-shaped elastic body is provided on the outer periphery of the flexible endless member to fit with the metal member.