JPS6134569B2 - - Google Patents

Description

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

V-belt transmission devices used in continuously variable transmissions, etc., can obtain greater frictional force than ordinary flat belts due to the wedge action on both inclined grooves of the pulley.
Although it is suitable for transmitting large amounts of power, rubber V-belts may not be able to withstand the transmitted power because of the large tension it takes. Furthermore, since the rubber V-belt is highly elastic, it has a large hysteresis loss.

A metal V-belt transmission device has been developed to overcome these inconveniences, and one example is the metal V-belt transmission device (Japanese Patent Publication No. 33-7762) as shown in Figures 1 to 6. ).

The metal V-belt transmission device has a thin steel plate belt 0
1 is a trapezoidal plate made of steel plate having a trapezoidal shape having the same angle as the relational angle between the conical surfaces of the two conical bodies 03, and the endless thin steel plate 01 is parallel to the bottom plate of the trapezoid in its central part. A V made by alternately combining several trapezoidal metal members 02 in which rectangular holes having the same length as the width are provided at positions offset to one side from the center of the trapezoid.
It is constructed by continuously combining a block body 04 and a V-shaped spring 05, and the metal V-belt is connected to a driving V-pulley 06 and a driven V-pulley 0 (not shown).
7 is placed on the bridge.

However, in the metal V-belt transmission device shown in FIGS. 1 to 6, between the trapezoidal metal member 02 and the endless thin steel plate 01, the trapezoidal metal member 02 is placed between the left and right sides of the V pulleys 06 and 07. The conical surfaces of the conical body 03 are alternately pressed against each other, and this is applied to the thin steel plate 01.
This creates scissor-like friction against the steel plate 01, causing wear on both ends 08 of the thin steel plate 01. This is because the greater the transmitted power, the greater the scissor-shaped friction needs to be, and therefore, the greater the power transmitted, the more the metal V-belt will wear out. Moreover, since the cross-sectional area of the thin steel plate 01 decreases due to wear, the load per cross-sectional area, that is, the tensile stress increases,
Durability is extremely poor, leading to cutting.

Further, as shown in FIGS. 3 to 6, since the trapezoidal metal member 02 and the V-shaped spring 05 only have rectangular holes on their sides, after inserting these members into the thin steel plate 01, Since both ends are formed into an endless shape by welding or the like, the metal material at the welded portion deteriorates due to heat, resulting in a decrease in tensile stress value, which significantly deteriorates the durability as described above.

The present invention relates to an improvement of a V-belt transmission device that overcomes these difficulties.The purpose of the present invention is to facilitate assembly and adjustment, to be able to transmit large amounts of power reliably and efficiently, and to improve durability. The purpose is to provide an excellent V-belt transmission device.

An embodiment of the present invention shown in FIGS. 7 to 11 will be described below.

Reference numeral 1 designates an endless transmission for motorcycles. In the transmission 1, each V of a drive V pulley 2 and a driven V pulley
A V-belt 6 is stretched across the grooves 3 and 5.

Further, the V-belt 6 includes a large number of V-shaped metal members 7 and a spring roller 12 that is an elongated roller member interposed between the large number of V-shaped metal members 7 and has elasticity.
, the V-shaped metal member 7 and the spring roller 1
An endless rubber belt 13 that tightens the outer periphery of the connecting unit consisting of 2, a flexible endless member 14 that tightens the outer periphery of the endless rubber belt 13 and that is made of at least one or more endless thin steel plates of a certain width, and It consists of a rubber endless holding member 15 provided in contact with the outer peripheral surface of the flexible endless member 14.

As shown in FIGS. 8 to 11, the V-shaped metal member 7 is symmetrical such that its both end surfaces 8 are in contact with the V grooves 3 and 5 of the V pulleys 2 and 4 at a predetermined angle of inclination θ. The front and rear end surfaces 9 of the V-shaped metal member 7 are formed to be parallel to each other, and the inner front and rear end surfaces 9a have l ₁ in the width direction.
A circular arc-shaped groove 10 having a length and a radius of curvature r ₁ is formed. A rectangular notch 11a is formed in the outer part of the V-shaped metal member 7, and a notch 11a is formed further outward of this rectangular notch 11a.

Further, the spring roller 12 has the circular arc groove 1
The length l ₂ is 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. and the spring roller 12
is a hollow cylinder made of thin spring material, at least a portion of which is cut out, and has a spring action that allows it to deform in the diametrical direction.

Further, the endless rubber belt 13 has a V-shaped metal member 7 as shown in FIGS. 8 to 11.
The endless rubber belt 13 has a length that tightens the outer periphery of the connected unit consisting of the spring roller 12 and the spring roller 12, and has a U-shaped cross section. It is adapted to be engaged with the formed notch 11a with a predetermined tension, and its outer wall surface is further tightened with a predetermined tension by the flexible endless member 14. There is. Moreover, this endless rubber belt 13 may be an integral one made of rubber or the like;
It may also be one in which a cloth or rope having tensile strength is used as a core material. In other words, it is preferable to hold the spring roller 12 and reduce hysteresis during tightening.

Furthermore, the rubber endless holding member 15, which is set to a length such that it can come into contact with the outer circumferential surface of the flexible endless member 14 with a predetermined tension, is inserted into the notch 11b of the V-shaped metal member 7. It is formed into a rectangular shape with a corresponding shape so that it can be engaged. Moreover, the outer peripheral surface of the spring roller 12 is
It is pressed against the inner wall surface of No. 3 with a predetermined tension. This rubber endless holding member 15 is also similar to the endless rubber belt 13.

Since the embodiment shown in FIGS. 7 to 11 is constructed as described above, the flexible endless member 1
4 is engaged with the endless rubber belt 13, and the V-shaped metal member 7 is directed from the inside to the outside of the integrated flexible endless member 14 and the endless rubber belt 13.
to engage the notch 11a of the V-shaped metal member 7 with the endless rubber belt 13, engage the spring roller 12 with the circular groove 10 of the V-shaped metal member 7, and repeat this process. This process is repeated all around the integrated flexible endless member 14 and endless rubber belt 13.

Next, the flexible endless member 14 and the endless rubber belt 13 are made into a circular shape, and a jig or the like is used to move the V-shaped metal members 7, which sandwich the part where the spring roller 12 is not inserted, away from each other. Applying force to both members 7, the opposing arcuate grooves 1 of both members 7
0 to engage the last spring roller 12.
As a result, the action of the spring roller 12 causes the V-shaped metal member 7 and the spring roller 12 to
It is also pressed against the endless rubber belt 13. Furthermore, the V-belt 6 can be assembled by engaging a rubber endless holding member with the notch 11b of each V-shaped metal member 7. In addition, rubber endless holding member 1
5 and the notch 11b of the V-shaped metal member 7 are engaged with each other with a predetermined tightness.

Therefore, the tightening force of the flexible endless member 14 tightly presses the endless rubber belt 13 against the outer periphery of the spring roller 12, and firmly fixes the spring roller 12 and the V-shaped metal member 7 to the flexible endless member 14. do. Therefore, during power transmission, torque from the drive V pulley 2 is transmitted to the V-shaped metal member 7,
Flexible endless member 1 via endless rubber belt 13
4 can be conveyed. Thus, the flexible endless member 14
The driven V-pulley 4 is driven by the large belt tension generated.

In addition, the V groove 3 of the driving and driven V pulleys 2 and 4,
When the V-shaped metal members 7 are engaged with and rotating, each V-shaped metal member 7 rotates by rolling contact via the spring rollers 12.

As described above, in this embodiment, a large amount of power can be transmitted by transmitting torque by the belt tension applied to the flexible endless member 14.

Further, in this embodiment, the flexible endless member 14
Since the endless rubber belt 13 is interposed between the spring roller 12 and the endless rubber belt 13,
The large friction force generated by this restricts the relative sliding movement between the flexible endless member 14 made of a thin steel plate and the spring roller 12. Therefore, even without oil, there is no risk of frictional heat being generated between the flexible endless member 14 and the spring roller 12, and V
The belt 6 can be used without lubrication, and direct metal contact between the flexible endless member 14 and the spring roller 12 can be avoided, and the generation of abnormal noise can be prevented. Moreover, the endless rubber belt 1
3 also performs an adjustment function when the V-shaped metal member 7 engages with the V-pulleys 2 and 4. That is, even if there is some variation in the dimensions of each V-shaped metal member 7, when the V-shaped metal member 7 engages with the V-pulleys 2 and 4, the elasticity of the endless rubber belt 13 absorbs the error in the V-shaped metal member 7. As a result, both end surfaces 8 of each V-shaped metal member 7 come into uniform contact with the V-grooves 3 and 5, and uneven wear of each V-shaped metal member 7 can be prevented.

Furthermore, in this embodiment, the cross-sectional shape of the endless rubber belt 13 is formed into a U-shape, and the flexible endless member 14 is fitted into the recessed part of the endless rubber belt 13, so that the side surface of the flexible endless member 14 is There is no direct contact with the V-shaped metal member 7, there is no risk of abnormal noise or abrasion occurring between the flexible endless member 14 and the V-shaped metal member 7, and there is no need for lubrication. Use V-belt 6.

Furthermore, in this embodiment, adjacent V
Since the shaped metal member 7 is in contact with the circular arc groove 10 via the spring roller 12, the bending deformation of the V-belt 6 is caused by the flexible endless member 14 and the endless rubber belt 1.
3 and the rubber endless holding member 15, the V-shaped metal member 7 is moved to the spring roller 12.
It can be easily swung.

In the embodiment shown in FIGS. 7 to 11, the flexible endless member 14 is guided by the endless rubber belt 13 having a U-shaped cross section. may be formed into a flat plate, and the flexible endless member 14 may be guided by a rubber endless holding member 15 having an inverted U-shaped cross section so that the V-shaped metal member 7 and the flexible endless member 14 do not come into contact with each other. Even if this is done, Figures 7 to 11
The same effects as the embodiment shown in the figure can be expected.

Further, as shown in FIGS. 13 to 14, the rubber endless holding member 15 having an inverted U-shaped cross section,
Extending portions 15a are formed downward at predetermined intervals from both side surfaces of the endless holding member 15 made of rubber.
5a may be engaged with outer front and rear end surfaces 9b of adjacent V-shaped metal members 7. In this way, even if a force is applied that causes the outer front and rear end surfaces 9b of adjacent V-shaped metal members 7 to approach each other, abnormal inclination of the adjacent V-shaped metal members 7 can be prevented. , a reduction in transmission efficiency due to poor engagement with the V pulleys 2 and 4 can be avoided. Note that the endless rubber belt 13
Extensions may be provided on the sides at predetermined intervals, and the extensions may be engaged with the front and rear end surfaces of adjacent V-shaped metal members 7.

As is clear from the above description of the embodiments, 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 both pulleys. The metal members are brought into contact with each other via an elongated roller member, and the outer periphery of the connected unit consisting of the same V-shaped metal member and the elongated roller member is tightened with an endless band-shaped elastic body, and the outer periphery is further tightened with a flexible endless metallic member. Since it is tightened with members, it is possible to easily assemble and adjust the V-belt transmission device, which can transmit large power reliably and efficiently, has excellent durability, and generates little noise during operation.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a conventional V-belt transmission device, Fig. 2 is a longitudinal sectional front view thereof, Fig. 3 is a front view of a trapezoidal metal member, Fig. 4 is a side view thereof, and Fig. 5 is a FIG. 6 is a front view of the V-shaped spring, FIG. 6 is a side view thereof, FIG. 7 is a side view illustrating an embodiment of the V-belt transmission device according to the present invention, and FIGS. line, - cross-sectional view taken along the line, 1st
Figure 0 is an enlarged cross-sectional side view of the main parts of the same embodiment, Figure 11 is an enlarged perspective view of the main parts of the same embodiment, and Figure 1 is an enlarged perspective view of the main parts of the same embodiment.
FIG. 2 is a longitudinal sectional side view of another embodiment of the V-belt transmission according to the present invention, FIG. 13 is a longitudinal sectional side view of still another embodiment of the V-belt transmission according to the invention, and FIG. 14 is a schematic diagram thereof. It is a partially enlarged perspective view. 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 end surfaces, 9... Front and rear end surfaces, 10... Circular groove, 11... Notch, 12... Spring roller, 13... Endless rubber belt, 14... Flexible endless member, 15... ...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 both pulleys, in which a large number of V-shaped metal members in contact with both pulleys are connected to each other by an elongated roller member. In addition to contacting through
A V-belt transmission device characterized in that the outer periphery of a connected unit consisting of the V-shaped metal member and the elongated roller member is tightened by an endless band-shaped elastic body, and the outer periphery is further tightened by a metallic flexible endless member. 2. The device according to claim 1, wherein the side surface of the flexible endless member and the V-shaped metal member are brought into contact with each other via a guide portion integrally formed with the endless band-shaped elastic body. V-belt transmission device. 3. An endless elastic holding member is provided on the outer periphery of the flexible endless member, and the side surface of the flexible endless member and the V-shaped metal member are connected through a guide portion integrally formed with the endless elastic holding member. The V-belt transmission device according to claim 1, wherein the V-belt transmission device is in contact with each other. 4. The V-belt transmission device according to claim 1, wherein an extending portion of the endless band-like elastic body is interposed between the adjacent V-shaped metal members. 5. The V-belt transmission device according to claim 3, wherein an extending portion of the endless elastic holding member is interposed between the adjacent V-shaped metal members.