JPH031539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement of a V-belt for power transmission having a V-shaped cross section.

Prior Art and Problems to be Solved V-belts are suitable for transmitting large amounts of power because they can obtain greater frictional force than ordinary flat belts due to the wedge action of both inclined groove surfaces, and are suitable for continuously variable transmissions, etc. widely used.

There are two types of V-belts: rubber V-belts and metal V-belts.Rubber V-belts are currently widely used because they are lightweight and have low production costs, but they have poor tensile strength and strength against lateral pressure. It had its limitations and had the drawback of not being able to transmit large amounts of power.

Additionally, metal V-belts have high tensile strength and strength against lateral pressure, making them suitable for large power transmission applications, but since metal V-belts have metal-to-metal rotating contact with pulleys, lubricating oil must be supplied. The disadvantage was that there was increased wear on the contact surfaces. Therefore, when lubricating oil is used, the coefficient of friction becomes smaller, and depending on the state of the lubricating oil's film,
The value of the frictional force between the metal V-belt and the V-groove of the V-pulley fluctuated greatly, and the transmitted torque could not be determined unambiguously.

Means and Effects for Solving the Problems The present invention relates to an improvement of a V-belt electric transmission device that overcomes such difficulties, and includes a driving V-pulley and a driven V-pulley.
In a V-belt transmission device that spans between pulleys and transmits power between both pulleys, the V-belt has a flexible endless member tightening the outer periphery of a large number of V-shaped members in contact with the pulleys. The core material is metal,
Further, an elastic material having high abrasion resistance and heat resistance is laminated on at least both sides of the core material in contact with the pulley in an oil-free state, and an elongated roller member is interposed between the V-shaped members. It is.

The present invention is a V-belt transmission device that is spanned between a driving V-pulley and a driven V-pulley and transmits power between the two pulleys, and the outer periphery of a large number of V-shaped members in contact with the pulleys is tightened with a flexible endless member. In this V-belt, the core material of the V-shaped member is made of metal, and an elastic material with high abrasion resistance and heat resistance is overlaid on at least both sides of the core material in contact with the pulley without lubrication. In addition to being able to use V-belts in applications, it also generates a large frictional force between the pulley and V-shaped member to reliably transmit large amounts of power, and it also has great durability as it can withstand aging due to wear and heat. It can be greatly improved.

In addition, in the present invention, the outer periphery of a large number of V-shaped members is tightened by flexible endless members, and the elongated roller member is interposed between the V-shaped members, so that the tension acting on the flexible endless members and the Power can be transmitted using both the compressive force acting on the V-shaped member and the elongated roller member, increasing the transmitted power and greatly reducing friction and wear between the V-shaped members. Therefore, durability and power transmission efficiency can be improved.

Further, in the present invention, the driving V pulley and the driven V pulley
This is a V-belt transmission device that is spanned between pulleys and transmits power between both moving pulleys, in which a number of V-shaped members in contact with the pulleys are brought into contact with each other via elongated roller members, and the V-shaped members and the elongated In a V-belt in which the outer periphery of a connecting unit consisting of a roller member is tightened with a flexible endless member, since an oil-impregnated material is used for the elongated roller member, the flexible endless member can withstand large tensions and transmit large amounts of power. At the same time, the elongated roller member made of oil-impregnated material reduces wear and friction loss at the contact portion with the V-shaped member.

Embodiment An embodiment of the present invention illustrated in FIGS. 1 to 7 will be described below.

Reference numeral 1 denotes a continuously variable transmission for a motorcycle, and in the transmission 1, a V-belt is spanned across V-grooves 3 and 5 of a driving V-pulley 2 and a driven V-pulley 4, respectively.

The V-belt 6 also includes a large number of V-shaped members 7, a needle roller 14 which is an elongated roller member interposed between the same number of V-shaped members 7, and a continuous unit consisting of the V-shaped member 7 and the needle roller 14. It is composed of a flexible endless member 15 made by stacking a number of endless thin steel plates of a constant width to tighten the outer periphery, and a rubber endless holding member 16 provided in contact with the outer peripheral surface of the flexible endless member 15. .

Further, the V-shaped member 7 is formed of a core material 8 made of a metal member and a covering material 9 made of a rubber material with high wear resistance and heat resistance.

Both sides 10 of the core material 8 made of the metal member are
It is formed to be symmetrically inclined at a predetermined inclination angle θ,
The front and rear end surfaces 11 of the concentric member 8 are formed to be parallel, and the inner front and rear end surfaces 11a thereof include
An arcuate groove 12 having a length l ₁ in the width direction and a radius of curvature r ₁ is formed. A rectangular cutout 13a is formed in the outer part of the core material 8, and an arcuate cutout 13b is formed in the outer part of the rectangular cutout 13a (the first 7
(see figure).

A covering material 9 is adhered to cover both side surfaces 10 and front and rear end surfaces 11 of the core material 8, respectively.

In the covering material 9, the outer front and rear end surfaces 1 of the core material 8
The part covering 1b is formed to have a thicker part 9a that is thicker than other parts, and the thick part 9a prevents the adjacent V-shaped members 7 from being inclined by a predetermined angle or more. It is now possible to prevent it.

Further, in the needle roller 14, the arcuate groove 1
The length l 2 of the groove 12 is shorter than the length _{l 1 of} the groove 12, and the radius r ₂ of the groove 12 is smaller than the radius of curvature r ₁ of the arcuate groove 12. and needle roller 14
is made of a porous oil-impregnated material, and the coefficient of friction at the contact surface with the V-shaped member 7 and the flexible endless member 15 is set to be small.

Furthermore, as shown in FIG.
It is curved so as to protrude outward on both sides so as to be able to engage with the arc-shaped notch 13b of the shaped member 7.

Since the embodiment shown in FIGS. 1 to 7 is constructed as described above, the V By moving the V-shaped member 7, the notch 13a of the V-shaped member 7 is inserted into the flexible endless member 15.
The needle roller 14 is engaged with the arcuate groove 12 of the V-shaped member 7, and this is repeated over the entire circumference of the flexible endless member 15.

Next, with this flexible endless member 15 shaped into a circular shape, force is applied to the two V-shaped members 7 with a jig or the like in a direction that separates the two V-shaped members 7 that sandwich the part where the needle roller 14 is not inserted. In addition, the last needle roller 14 is engaged with the opposing arcuate grooves 12 of both members 7, and the endless rubber holding members 16 are fitted into the notches 13b of each V-shaped member 7, thereby tightening the V-belt 6. can be assembled. The rubber endless holding member 16 fitted into the notch 13b of the V-shaped member 7 is adapted to apply a certain degree of compressive force to each V-shaped member 7.

Since the V-belt 6 is assembled as described above, the needle roller 14 is held in the arc-shaped groove 12 of the V-shaped member 7 by the flexible endless member 15, and therefore the V-belt 6 is attached to the V-pulley 2. , 4, when the V grooves 3 and 5 are curved, of course.
Even when the needle roller 14 is located between the pulleys 2 and 4, it does not fall off.

In this embodiment, since the V-shaped member 7 constituting the V-belt 6 is covered with a covering material 9 such as rubber, the V-grooves 3 and 5 of the V-pulleys 2 and 4
Since the metals do not come into contact with each other during contact with the V-shaped member 7 and the V-pulleys 2 and 4, no wear occurs. Therefore, there is no need to supply lubricating oil to the V-belt 6, and the V-belt 6 can be used in an unlubricated state, so the V-pulleys 2,
4 and the V-belt 6 can maintain a large value, and a large amount of power can be transmitted. Moreover, since lubricating oil is no longer necessary, there is no longer a situation where the frictional force fluctuates depending on the state of the lubricating oil film, and a constant transmission torque can always be reliably transmitted.

Further, in this embodiment, even if a large lateral pressure acts on both side surfaces of the V-belt 6, the core material 8 made of a metal member prevents deformation in the width direction, and
It is also possible to prevent the generation of frictional heat. Therefore, large power transmission is possible. Furthermore, since the core material 8 of the V-shaped member 7 is made of a metal member and is not partially covered by the covering material 9, it has excellent heat dissipation properties, prevents heat accumulation during operation, and prevents the V-belt 6 from seizing. is prevented.

Furthermore, in this embodiment, since the elongation of the V-belt 6 in the tension direction is suppressed to a minimum by the flexible endless member 15, the hysteresis loss caused by internal friction due to the elongation and contraction of the V-belt 6 is minimized.
Improves power transmission efficiency. In addition, since the flexible endless member 15 can bear a large tension,
It is possible to transmit large amounts of power even in a non-lubricated state.

Furthermore, in this embodiment, when transmitting power, in addition to transmitting power by normal belt tension,
The torque is transmitted by the V-shaped member 7 in contact with the V-groove 3 of the drive V-pulley 2, and the V-shaped member 7 transmits torque to the V-shaped member 7 on the moving side of the V-belt 6 via the needle roller 14 located on the moving side.
Compressive force is transmitted to the shaped member 7, and this compressive force is successively transmitted to the V-shaped member 7 in contact with the V-groove 5 of the driven V-pulley 4 via the needle roller 14 and the V-shaped member 7, thus driving the V-shaped member 7. Power is transmitted from the V-pulley 2 to the driven V-pulley 4. Therefore, power transmission efficiency is extremely high.

Further, in this embodiment, since the adjacent V-shaped members 7 are brought into contact via the needle roller 14, the bending deformation of the V-belt 6 is caused by the flexible endless member 15.
With only the bending of the rubber endless holding member 16, the V-shaped member 7 can easily swing due to line contact with the needle roller 14, and since the needle roller 14 is made of a porous oil-impregnated material, the V-shaped member 7 can easily swing.
There is little wear and friction loss at the contact portion with the shaped member 7. The needle roller 14 may be entirely made of an oil-impregnated material, or may have an oil-impregnated bearing fitted around its outer periphery. Alternatively, a heat-resistant material such as ceramic may be used.

Furthermore, in this embodiment, since the rubber endless holding member 16 and the notch 13b of the V-shaped member 7 are fitted with a predetermined pressure, the V-shaped member 7 is firmly attached to the rubber endless holding member 16. It can be supported. Therefore, it is possible to prevent the V-shaped member 7 from vertically and horizontally moving or falling off from the V-shaped member 6, and it is also possible to more reliably prevent the needle roller 14 from falling off from the V-shaped member 7. It also functions to make the contact between the member 7 and the V-grooves 3 and 5 uniform.

Furthermore, in this embodiment, the outer both sides of the adjacent V-shaped members 7 are
Even if a force that causes the parts a to approach each other is absorbed by the elasticity of the thick wall portion 9a, abnormal inclination of the adjacent V-shaped members 7 is prevented, thereby preventing poor engagement with the V pulleys 2 and 4. It is possible to avoid a decrease in transmission efficiency caused by this, and it is also possible to prevent the V-shaped member 7 from tilting even during linear motion.

In the embodiments shown in FIGS. 1 to 7, a considerable portion of the core material 8 constituting the V-shaped member 7 is covered with the covering material 9, but as shown in FIG. may be exposed. In this way, heat dissipation is further improved.

Also, as shown in FIGS. 9 and 10,
The rectangular notch 13a of the core material 8 may be formed to extend upward, and both sides of the notch 13a may be partially covered by the covering material 9. In this way, the flexible endless member 15 can be held by the covering material 9.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating an embodiment of the V-belt transmission device according to the present invention, FIGS. 2 and 3 are longitudinal sectional views taken along lines - and - in FIG. 1, and FIG. The figure is an enlarged longitudinal sectional side view, FIG. 5 is a side view of the V-shaped member in the same embodiment, and FIG.
7 is an enlarged perspective view of essential parts in the same embodiment, FIG. 8 is a side view of a V-shaped member in another embodiment, and FIG. 9 is a longitudinal sectional view taken along the - line in the figure. Side view of the V-shaped member in the example, 1st
FIG. 0 is a longitudinal sectional view taken along the line XX in FIG. 9. 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 member, 8...
... core material, 9 ... covering material, 10 ... both sides, 11 ...
... Front and rear end surfaces, 12 ... Arc-shaped groove, 13 ... Notch, 14 ... Needle roller, 15 ... Flexible endless member, 16 ... Rubber endless holding member.

Claims (1)

[Scope of Claims] 1. A V-belt transmission device that spans between a driving V-pulley and a driven V-pulley and transmits power between the two pulleys, in which the outer periphery of a large number of V-shaped members in contact with the pulleys is made flexible. In a V-belt tightened with an endless member, the core material of the V-shaped member is metal, and an elastic material with high wear resistance and heat resistance is superimposed on at least both sides of the core material in contact with the pulley in an oil-free state, A V-belt transmission device characterized in that an elongated roller member is interposed between the V-shaped members. 2. A V-belt transmission device that spans between a driving V-pulley and a driven V-pulley and transmits power between the two pulleys, in which a large number of V-shaped members in contact with the pulleys are brought into contact with each other via elongated roller members, and ,
1. A V-belt transmission device in which the outer periphery of a continuous unit consisting of the same V-shaped member and an elongated roller member is tightened by a flexible endless member, wherein the elongated roller member is made of an oil-impregnated material. 3. An elastic material is extended and overlapped on the outer facing surfaces of the V-shaped member to prevent the V-shaped member from tilting by more than a predetermined angle during movement. The V-belt transmission device according to scope 1.