JPH03103643A - Power transmission ring body and ring type power transmission system - Google Patents

Abstract

PURPOSE:To provide an increased life, to reduce the generation of noise, to reduce wear of a ring body and a pulley, and to simplify structure by a method wherein a ring type power transmission system is of structure in which a plurality of ring pieces containing a pair of ring pieces provided at the one surface with respective slopes making contact with a pulley are superposed with each other, a plurality of ball bodies are located between groove parts approximately in the shape of a semicircle in cross section and a gap part is formed between the ring pieces. CONSTITUTION:A power transmission ring body 1 is formed of a rigid substance, e.g. a metal, and ring pieces 2 and 3 provided on the one surface with slopes 4 and 5 and on the other surface with groove parts 6 and 7 approximately in the shape of a semicircle in cross section are superposed with each other in a state that a plurality of ball bodies 8 are located between the groove parts 6 and 7. Gear shift pulleys 13 are respectively mounted to drive and driven shafts 10 and 11, and a power transmission ring body 1 is spanned between two pulleys. A gear shift pulley 13 is formed with a fixed pulley piece 14 secured on a shaft and an axially slidably arranged moving pulley piece 15. The moving pulley 15 is provided on the back side with a spring 16 and a torque cam 17, and a plurality of ball bodies are sealed in a space where the extension part of the moving pulley piece forms a part of a well. The moving pulley is moved by a centrifugal thrust mechanism 18 which moves the moving pulley piece by means of the centrifugal force of the ball body generated through rotation of a shaft.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a ring-type power transmission system, and more specifically, to a long-life and quiet power transmission system using a ring body made of a rigid body. .

(Prior technology) In order to transmit power by installing variable speed pulleys on the drive shaft and driven shaft, high-strength, low-stretch tensile material such as polyester fiber, polyamide, aromatic polyamide, glass fiber, or metal wire is used inside. Belts made of rubber or resin elastomers with body lobes embedded therein were used, and belts with resin blocks above and below such structures were used.

However, these elastomer belts have a limited lifespan due to unavoidable tensile rest lobes or elastomer fatigue.

In addition, there are belts that connect many metal blocks like a chain, and push-transmission belts that have many metal plates slidably fitted into an endless band, but these belts have a contact surface with a pulley. It is an intermittent surface with a predetermined pitch, and when running, pitch noise is always generated, making noise problems unavoidable.

Therefore, a method has been proposed in which power is transmitted by hanging a ring body made of a rigid body around a pulley, as shown in Japanese Utility Model Publication No. 38-1132.

(Problem to be solved by the invention) However, if a rigid ring body is used, the contact with the pulley is only a line contact, and when trying to transmit a large torque, the slip rate increases and the transmission efficiency deteriorates. If the contact pressure is increased to prevent slippage, the wear of the ring body and pulley will increase and durability will deteriorate.

Furthermore, when used in a variable speed pulley of a continuously variable transmission system, there are problems such as a high slip rate and wear of the ring body and pulley due to the difference in speed between the movable pulley piece and the fixed pulley piece that occurs during speed change.

Furthermore, when a belt is used in a continuously variable transmission system, the speed must be changed by changing the width of the V-shaped groove of the pulley itself, which requires the pulley to have a complicated structure.

The present invention solves these problems and provides a ring-type power transmission system that has an extremely long life, is quiet, has less wear on the ring body and pulley, and can simplify the structure of the speed change pulley. purpose.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a ring body that is suspended between pulleys to transmit power, including a pair of ring pieces each having an inclined surface on one side that contacts the pulley. It has a structure in which a plurality of ring pieces are stacked on top of each other, and between the ring pieces there is a groove with a substantially semicircular cross section in the midsection along the entire circumference of the overlapping surface, and between the grooves there are a plurality of ring pieces. A power transmission ring body characterized by having a sphere interposed therebetween and a gap between the ring pieces,
A pair of rings that have an inclined surface that abuts a pulley on one side are superimposed, and an outer ring piece that has an inclined surface that abuts a pulley on one side is superimposed on both sides of an inner ring piece that has an extended support part. Also included.

In addition, the power transmission ring body has a structure in which a pair of ring pieces are overlapped each other, each having an inclined surface that comes into contact with the pulley on one side. A semicircular groove is provided, a supporting portion having a substantially semicircular cross section is provided over the entire circumference on the other side, the groove and the supporting portion are fitted, and a gap is provided between the ring pieces. shall be.

Further, each of the driving shaft and the driven shaft is provided with a variable speed pulley consisting of a fixed pulley piece fixed to the shaft, a movable pulley piece movable with respect to the shaft, and a means for moving the movable pulley piece, and the variable speed pulley is provided with a ring body. In a ring-type power transmission system in which a It is characterized by having a groove portion having a substantially semicircular cross section in the midsection along the entire circumference of the combined surfaces, a plurality of spheres interposed between the grooves 8lK, and a void portion between each ring piece. In addition, the ring body is made by stacking a pair of ring pieces each having an inclined surface that contacts the pulley on one side, and the ring body has an inner ring piece with a supporting portion extended on both sides, and an inclined surface that contacts the pulley on one side. It also includes a structure in which outer ring pieces having surfaces are stacked one on top of the other, and are swingably supported by the support portion.

It also includes a case in which a handle extends from the inner ring piece and is connected to an external force that swings the ring body via the handle.

(Function) By using the power transmission ring body of the present invention, in a ring type power transmission system, the inner peripheral side of the outer ring is deformed to narrow the width of the ring body due to the side pressure from the V pulley, and the wall surface of the pulley is deformed. It will have a shape that follows. and,
In the power transmission ring body of the first, second, and third aspects, each ring piece can rotate independently, so that it is possible to absorb a difference in rotation between the movable pulley piece and the fixed pulley piece during speed change.

Further, in the ring type power transmission system according to claims 7 and 8 using the power transmission ring body according to claim 3, the inner ring piece does not rotate but is swingably supported and the handle provided on the inner ring piece is It is possible to perform a speed change operation by swinging the gear by an external force.

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

(Example) FIG. 1 is a front view of a power transmission ring body of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1. The power transmission ring 1 is made of a rigid body such as metal, and has inclined surfaces 4 and 5 that come into contact with a pulley on one side, and a groove 6 with a substantially semicircular cross section on the other side.
, 7 are stacked one on top of the other with a plurality of ball rests 8 interposed between the grooves 6 and 7, and a gap is formed between the two ring pieces. The power transmission ring 1 is made up of multiple parts, and the slopes 4 and 5 of the ring pieces that come into contact with the pulley are smooth continuous surfaces, allowing for low-noise power transmission without pitch noise. can be done.

In addition, Figure 3 shows the power transmission ring 11 shown in Figures 1 and 2! A ring-type power transmission system was used, in which variable speed pulleys 13 were provided on each of the drive shaft 10 and driven shaft 11, and a power transmission ring 1 was suspended between both pulleys. The variable speed pulley 13 consists of a fixed pulley piece 14 fixed to the shaft and a movable pulley piece 15 slidably arranged in the axial direction. A plurality of spheres are confined in a space whose extension part is part of the wall, and the movement is performed by a centrifugal thrust mechanism 18 or the like that moves a movable pulley piece by the centrifugal force of the spheres when the shaft rotates, but its structure or main purpose is The invention is not limited.

Figures 4 and 5 are cross-sectional views of the main parts of the power transmission ring suspension 1 suspended on a pulley, where no lateral pressure is applied from the pulley, and where lateral pressure is applied. The V angle φ formed by the inclined surfaces 4 and 5 of the power transmission ring 1 is different from the V angle θ formed by the pulley pieces 14 and 15, and the V angle on the pulley side is somewhat larger φ<θ.

The angular difference varies depending on the thickness of the ring body, etc., but is usually preferably in the range of 0.1 to 2.0°C. However, there are gaps 9 above and below the ball rest 8 between the ring pieces 2 and 3, and the ring pieces 2 and 3 are deformed due to the side pressure applied from the pulley pieces 14 and 15, as shown in FIG. Along the angle of the pulley pieces 14 and 15 as shown in FIG.
5 and the ring pieces 2 and 3 are in contact with each other over the entire width of the side surface. FIG. 6 is a cross-sectional view taken along line B-B in FIG.
It has a shape that follows the conical shape of Nos. 4 and 15, which increases the contact area and reduces surface pressure, reducing wear on the ring body and pulley.

When an integral ring is used as described above, the pulley and ring are only in line contact, but by creating the structure of the present invention, each ring piece can be deformed, and the pulley can be The pinched portion takes a shape that follows the pulley, increasing the contact area, and when used in a speed change pulley, it can also absorb misalignment that occurs when changing speeds. Furthermore, since the two ring pieces are independent and can rotate at different rotational speeds, it is also possible to absorb the difference in rotational speed between the two pulley pieces.

Further, FIG. 7 is a sectional view corresponding to FIG. 5 of an embodiment according to claim 2 of the present invention. This power transmission ring rest 21 is also made by overlapping two ring pieces 22 and 23, and one ring piece 22 has an inclined surface 24 that comes into contact with the pulley piece 30 and a groove with a semicircular cross section on the opposite surface. 26, the other ring piece 23 has an inclined surface 25 that comes into contact with the pulley piece 31, and a cylindrical shape having the same diameter as the cylindrical shape forming the groove 26 of the ring piece 22 and a depth greater than the depth of the groove 26 on the opposite surface. A support portion 27 having a long height and a semicircular cross section is provided. The ring piece 22 and the ring 23 are overlapped so that the groove portion 26 and the support portion 27 are fitted into each other. In addition, there is a gap 28 above and below the support portion 27 between the ring piece 22 and the ring 23, and the side pressure from the pulley causes the ring piece 22 to
, 23 are deformed, and the contact area between the power transmission ring body 21 and the pulley increases along the conical shape of the pulley pieces 30, 31. FIG. 8 is a sectional view of the ring body used in the ring type power transmission system of the present invention, and FIG.
It is an enlarged view of the part.

The ring body 41 is also made of a rigid body such as metal, and has a circular groove 46 at the center of both sides of the inner ring piece 42. A circular groove 45 having the same diameter as the groove 46 of the inner ring 42 is formed on one side on both sides of the inner ring piece 42. It has a structure in which an outer ring 43, the other surface of which is an inclined surface 43a, is stacked on top of each other with a number of steel balls 44 interposed therebetween. Further, the inner ring piece 42 can be supported on a support shaft 48 by a support portion 47. In this way, the outer ring piece 43 has a structure in which the inner ring piece 42 and the outer ring piece 43 can rotate independently of each other like a bearing, so that the inner ring piece 42 is supported and does not rotate, and only the outer ring piece 43 rotates. power is transmitted by

Further, the V angle of the inclined surface 43a of the outer ring piece 43 is made slightly smaller than the V angle of the pulley 49, so that when the ring rest 41 is not receiving lateral pressure from the pulley 49, as shown in FIG. ■ Angle of outer ring piece (φ
) and the angle (θ) of the pulley 49 have a relationship of φ × θ,
When the ring rest 41 runs and receives lateral pressure from the pulley 49, the V angle of the outer link piece 43 matches the V angle (θ) of the pulley 49 as shown in FIG. is locally deformed along the wall surface of the pulley 49, and the contact area is expanded. Therefore, the outer ring piece 43
It becomes possible to reduce the surface pressure between the pulley 49 and the pulley 49,
Not only can wear of the ring holder 41 and the pulley 49 be reduced, but also conduction efficiency can be improved. In addition, when the outer link piece 43 is deformed, if it comes into contact with the inner ring piece 42, the rotation of the outer ring piece 43 will be inhibited, so the diameter should be such that the distance between the outer ring 43 and the inner ring piece 42 can be sufficiently large. Use ball rest 44. FIG. 13 is a front view of the ring type power transmission system of the present invention. A V speed change pulley 49 is provided on each of the drive shaft 50 and the driven shaft 51, and the ring body 41 described above is suspended between both pulleys. movable,
Further, as shown in FIG. 8, the support shaft 48 is set longer than the support portion 47, so that the ring rest 41 has room to move back and forth along the support shaft 48. This is to allow the ring rest 41 to move in accordance with the movement of the running line of the ring rest 41 due to the change in the groove width of the pulley 49 due to the speed change operation.

In addition, a handle 52 is provided at another position of the inner ring piece 42, and the ring rest 41 is swung by an external force such as manual, hydraulic, or electric motor through the handle 52, and the variable speed pulley It becomes possible to use a transmission device even if an extremely simple structure is used for the 49. For example, as shown in FIG. 14, fixed pulley pieces 54 and 55 are fixed to the drive shaft 50 and driven shaft 51, and movable pulley pieces 56 and 5 are movable in the axial direction.
7, and a spring receiver 58 fixed to the boss portion of the fixed pulley pieces 54, 55 is provided on the back side of the movable pulley pieces 56, 57.
, 59 and the movable pulley pieces 56, 57.
0161, it is possible to obtain a speed change pulley having a simple structure with only a spring urging the movable pulley pieces 56, 57 in the direction in which the V groove width of the speed change pulley 49 is reduced.

In addition, the ring body is supported by a support part extending from the inner ring piece, in addition to supporting the ring body for stable gear shifting operations as described above, it is also used to reduce the torque applied to the ring body during driving. This also has the effect of preventing the ring body from deforming and reducing the power transmission efficiency.

Although the embodiment of the present invention has been described above, the structure is not limited to this embodiment, and a hydraulic device or a centrifugal force imparting material may be used in addition to a spring as a means for moving the movable pulley piece of the speed change pulley. A combination of centrifugal thrust and the like may also be used.

(Effects) The power transmission ring of the present invention is made of a plurality of ring pieces,
Since it has a structure in which a cavity is provided between the ring pieces, when it receives side pressure from the pulley during running, it deforms to follow the conical shape of the pulley piece, and the power transmission ring 4. Transmission efficiency is improved because the contact area between the ring and the pulley increases, and in a ring type power transmission system in which the ring body is hung on the speed change pulley, misalignment between the pulleys that occurs during speed change is absorbed by deformation of the ring piece. be able to. In addition, each ring piece can rotate independently, so even if there is a difference in rotational speed between the fixed pulley piece and the movable pulley piece during gear shifting, one side will slip and wear out. There is no. In addition, when using a ring body with an inner ring and two outer rings stacked on top of each other, the inner ring can be stopped from rotating, and a handle can be provided on the inner ring to allow children to move it and change gears. ,
The thrust means of the movable pulley piece attached to the variable speed pulley can be simplified, leading to weight reduction of the system. Since the contact surface of the ring body with the pulley is a smooth continuous surface, pitch noise does not occur, and transmission with a long life and low noise is possible.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a side view of the power transmission ring body according to claim 1, FIG. 2 is a sectional view taken along line A-A in FIG. A partial sectional view of a ring-type power transmission system using a transmission ring. Figure 4 is a sectional view of the power transmission ring suspended on a pulley and no side pressure is applied.
FIG. 5 is a sectional view of the part in FIG. 4 where the side pressure from the pulley is applied, FIG. 6 is a sectional view taken along line BB in FIG. 5, and FIG. 5 is a sectional view corresponding to FIG. 5, FIG. 8 is a sectional view corresponding to FIG. 2 of the power transmission ring body according to claim 3, FIG. 9 is an enlarged view of section E in FIG. 8, and FIG. 10 is a claim. 11 is a sectional view corresponding to FIG. 5 of the power transmission ring body according to No. 3, FIG. 12 is a sectional view taken along line C-C in FIG. 11, and FIG. The figure is a front view of the ring type power transmission system according to claim 8, and FIG. 14 is a sectional view taken along line DD in FIG. 13. 1, 21, 41...power transmission ring body 2, 3, 22,
23...Ring pieces 8, 44...Spheres 9, 15...Gap parts 14, 15, 30, 31,...Pulley pieces 4, 5, 24
, 25, 43a... inclined surfaces 6, 7, 26, 27...
Groove portion 27... Support portion 42... Inner ring piece 43... Outer link piece 47... Support portions 10, 50... Drive shafts 11, 51... Driven shaft 52... Handle

Claims (1)

[Claims] 1. In a ring body that is suspended between pulleys to transmit power, a plurality of ring pieces including a pair of ring pieces each having an inclined surface that contacts the pulley on one side are superimposed, and the ring pieces are stacked one on top of the other. A groove portion having a substantially semicircular cross section is provided between the ring pieces over the entire circumference of the overlapping surfaces, and a plurality of spheres are accommodated in the space formed by the groove portion, and a void portion is formed between the ring pieces. A power transmission ring body featuring: 2. The power transmission ring body according to claim 1, comprising a pair of overlapping ring pieces each having an inclined surface that contacts the pulley on one side. 3. The power transmission ring body according to claim 1, wherein outer ring pieces each having an inclined surface for contacting a pulley on one side are superimposed on both sides of an inner ring piece having an extending support portion. 4. In a ring body that is suspended between pulleys to transmit power, two ring pieces each having an inclined surface that comes into contact with the pulley on one side are superimposed, and between the ring pieces, one side of the overlapping surfaces is completely covered. In the groove section that is approximately semicircular in cross section,
A power transmission ring body characterized in that a support portion having a substantially semicircular cross section that protrudes over the entire circumference of the other surface is fitted to provide a gap between the two ring pieces. 5. A variable speed pulley consisting of a fixed pulley piece, a movable pulley piece movable with respect to the shaft, and a means for moving the movable pulley piece is provided on each of the driving shaft and the driven shaft, and a ring body is hung on both pulleys. In the suspended ring type power transmission system, the ring body has a structure in which a plurality of ring pieces are stacked together, including a pair of ring pieces that have an inclined surface that contacts the pulley on one side, and there is an overlapping surface between the ring pieces. A ring type power transmission system characterized by having a groove portion having a substantially semicircular cross section in the midsection over the entire circumference of the ring, a plurality of spheres interposed between the groove portions, and a void portion between each ring piece. . 6. The ring type power transmission system according to claim 5, wherein the ring body is formed by overlapping two ring pieces each having an inclined surface on one side that contacts the pulley. 7. The ring body has supporting parts on both sides of the inner ring piece,
6. The ring-type power transmission system according to claim 5, comprising overlapping outer ring pieces each having an inclined surface that contacts the pulley on one side, and is swingably supported by the support portion. 8. Claim 7, wherein the inner ring piece has a handle extending therethrough, and is connected to an external force for swinging the ring body via the handle.
The ring type power transmission system described. 9. A variable speed pulley consisting of a fixed pulley piece, a movable pulley piece movable with respect to the shaft, and a means for moving the movable pulley piece was provided on each of the driving shaft and the driven shaft, and a ring body was hung on the variable speed pulley. In the ring type power transmission system,
The ring body has a structure in which two ring pieces are stacked on one side and each has an inclined surface that comes into contact with the pulley, and one side of the overlapping surface of the ring pieces has a groove portion having a substantially semicircular cross section over the entire circumference. a ring type, characterized in that a support part having a substantially semicircular cross section is provided on the other side over the entire circumference, the groove part and the support part are fitted, and a gap is provided between the rings. Power transmission system.