JPH0681920A - Ring transmission system - Google Patents

Abstract

PURPOSE:To obtain a ring transmission system with slight abrasion, long life, high transmission efficiency, and wide transmission amplitude. CONSTITUTION:A ring transmission system is prepared by hanging ring bodies between a plurality of transmission pulleys. An input shaft S1, an intermediate shaft S2, and an output shaft S3 are triangularly arranged. The input shaft S1 is provided with a transmission pulley 2 on a first plane M1 perpendicular to the shaft, and an idler pulley 7 on a second plane M2 different from the first plane M1. The intermediate shaft S2 is provided with transmission pulleys 4 respectively on the first plane M1 and the second plane M2. The output shaft S3 is provided with an idler pulley 9 on the first plane M1 and a transmission pulley 3 on the second plane M2. Ring bodies 5, 6 are hung around the pulley groups on the first plane M1 and the second plane M2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring type transmission system in which a ring body is suspended between transmission pulleys to transmit power from an input shaft to an output shaft.

[0002]

2. Description of the Related Art In a system in which a speed change pulley is provided for each of an input shaft and an output shaft and power is transmitted by speed change, a belt made of rubber or resin or a chain type bendable belt made of metal is usually hung between the pulleys. It is mounted and used. A core made of various fibers is embedded in the part where there is no belt such as rubber or resin, and the life is extended by improving the rubber composition, but there is a limit to that. Even in the case of a metal belt, since it has flexibility, it has a structure in which a large number of metal pieces with a fixed pitch are connected, so noise during running is large, and there are problems such as friction and wear of the connecting part.
There was a limit to extending the life. In order to solve these problems, a system has been proposed in which a ring body made of a metal rigid body is hung between pulleys to transmit power. (JP-A-3-103643)

[0003]

However, a problem in power transmission in which a ring body made of a metal rigid body is hung between pulleys is that the ring body is a rigid body.
The contact area with the pulley becomes small, and it is difficult to improve the transmission efficiency. Japanese Patent Laid-Open No. 3-1
Japanese Patent No. 03643 also discloses means for solving the problem, and attempts to increase the contact area between the ring body and the pulley by devising the shape of the ring body. In view of the fact that the contact area between the ring body and the pulley becomes smaller as the effective diameter of the speed change pulley becomes smaller when the speed change pulley having an effective diameter that changes is used as the pulley,
The present invention has been accomplished in order to maximize the contact area between the ring body and the pulley. As described above, an object of the present invention is to provide a ring type transmission system that has a long life, high transmission efficiency, and a wide gear ratio.

[0004]

That is, according to the present invention, a ring body is hooked between a plurality of speed change pulleys each including a fixed pulley piece fixed to a shaft and a movable pulley piece movable at least in the axial direction with respect to the shaft. In a ring type transmission system that is mounted, three shafts of an input shaft, an intermediate shaft, and an output shaft are arranged in a triangular shape, and power is transmitted from the input shaft to the output shaft through the intermediate shaft. A transmission pulley on a first plane perpendicular to the axis and an idler pulley on a second plane different from the first plane, and one intermediate transmission has one transmission on the first plane and one transmission on the second plane. The output shaft includes an idler pulley on the first plane and a speed change pulley on the second plane, and the output shaft has a pulley group on the first plane and a pulley group on the second plane, respectively. In addition, the body is suspended, and the structure is Two variable speed pulley of the intermediate shaft has a respective fixed pulley piece on each side, the movable pulley piece having a conical surface on both sides and also includes those consisting of linked variable speed pulley to move between the two sides of the fixed pulley.

[0005]

In the ring type transmission system of the present invention, since the ring body made of a rigid body is suspended between the transmission pulleys, it is possible to obtain a transmission system having a very long life with little wear and running. There is little noise at the time. Furthermore,
Since the speed change transmission by two ring bodies is connected via the intermediate shaft, if the maximum diameter of the speed change pulley which is a drawback of the conventional ring type transmission is fixed and an attempt is made to increase the speed change width, It is necessary to reduce the effective diameter, but if the effective diameter of the speed change pulley becomes smaller, the contact area between the ring body and the pulley becomes smaller and the transmission efficiency decreases, so a very small effective diameter cannot be used, and the gear ratio cannot be wide. The problem is solved and a wide gear ratio can be achieved without reducing transmission efficiency.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a ring type transmission system according to the present invention. The ring type transmission system 1 of the present invention is
The input shaft S ₁ , the intermediate shaft S ₂ and the output shaft S ₃ are arranged in a triangular shape, and power is transmitted from the input shaft S ₁ to the output shaft S ₃ via the intermediate shaft S ₂ . Then, power is changed by transmission from the input shaft S ₁ to the intermediate shaft S ₂ , and further from the intermediate shaft S ₂ to the output shaft S _3.
The transmission is also shifting.

Although a speed change pulley is used to transmit power, one speed change pulley 2 and 3 are provided on the input shaft S ₁ and the output shaft S ₃ , respectively, and a connecting speed change pulley 4 is provided on the intermediate shaft S _2. Is provided. As shown in FIG. 2, in the speed change pulley 2 provided on the input shaft S ₁ , a fixed pulley piece 101 is fitted and fixed to a spline provided on the shaft S, while the movable pulley piece 102 is opposed to the fixed pulley piece 101. Is a spline 1 provided on the sheave shaft 103 of the fixed pulley piece 101.
A V-shaped groove, which is fitted in No. 04 and which hangs the ring body 5 by both pulley pieces 101 and 102, is formed.

The movable pulley piece 102 is mounted so as to be movable with respect to the longitudinal direction of the sheave shaft 103 of the fixed pulley piece 101. At the back of the movable pulley piece 103, a projecting inner and outer extending portion 105, 106 is provided, and a fixing piece 107 is provided on the shaft at the rear of the back portion, and a space portion 108 is formed by the inner and outer extending portions 105 and 106 and the fixed fixing piece 107.
A freely movable centrifugal force imparting material 109, for example, a hard ball such as a steel ball, is housed in the inside of 8. The centrifugal force imparting material 109 is a steel ball having a diameter of approximately φ2.5 mm and occupies approximately 60 to 90% of the volume of the space 108. Further, a coil spring 110 is contracted at the bottom of the V groove of the fixed pulley piece 101 and the movable pulley piece 102, and a thrust force is applied to the movable pulley piece 102 in a direction in which the width of the V groove is widened.

As the centrifugal force imparting material 109 used in the above structure, balls such as the above-mentioned steel balls are most commonly used, but in addition, irregular shape materials, square materials, powders and the like are also used. One kind or a mixture of two or more kinds can be used. Variable speed pulley 3 provided on the output shaft S ₃
As shown in FIG. 3, a fixed pulley piece 111 is fitted to the output shaft S ₃ and fixed by bolts, while a movable pulley piece 112 is slidably fitted to the sheave shaft 113 of the fixed pulley piece 111 so as to face the fixed pulley piece 111. ing. Then, the tubular cam piece 1 provided on the boss 114 of the movable pulley piece 112
15 and a cylindrical cam piece 117 provided on a stopper 116 fixed to the shaft S ₃ mesh with each other so that both cam pieces 115, 1
A torque transmission portion 118 with a cam mechanism is formed by 17.

The torque transmitting portion 118 is formed by each cam piece 11
When the teeth of Nos. 5 and 117 are engaged with each other on their inclined surfaces and the movable pulley piece 112 rotates, torque is transmitted to the output shaft S _3, and the axial component force generated from this meshing is efficiently transmitted to the movable pulley piece 112. It is designed to give a specific thrust. Further, in addition to the above, the coil spring 1 acting as a means for applying a thrust to the movable pulley piece 112 acts in a direction in which the V groove formed by the pulley pieces 115 and 117 between the back portion of the movable pulley piece 112 and the stopper 116 contracts.
19 is provided.

[0011] engaged transmission pulley mounted on the intermediate shaft S ₂ is of a known, as shown in FIG. 4, the intermediate shaft S ₂
The fixed pulley piece 201 is fixed to the sheave shaft 20 of the fixed pulley piece 201 by a means such as a spline, a key and a bolt.
6, a movable pulley piece 203 having inclined surfaces on both sides is provided slidably in the axial direction, and further, on the sheave shaft 206, on the opposite side of the fixed pulley piece 201 with respect to the movable pulley piece 203, a fixed pulley piece 202 is provided. Is fixed to the sheave shaft 206. The movable pulley piece 203 between the fixed pulley pieces 201 and 202 has inclined surfaces 204 and 205 for contacting the left and right sides with the V ring 5, respectively.
01 and the left slope 204 of the movable pulley piece 203, the V ring 5 is formed in the V groove, and the V groove formed by the fixed pulley piece 202 and the right slope 205 of the movable pulley piece 203 is formed in the V groove.
The ring 6 is hung, and the movable pulley piece 203 has a structure that freely moves in the left-right direction according to the movement of the V ring.

Among these speed change pulleys, one pulley 4a of the speed change pulley 2 of the input shaft S ₁ and the connection speed change pulley 4 of the intermediate shaft S ₂ is the same as the first perpendicular to the respective axes S ₁ , S ₂ , S ₃ . 1 is on the plane M _1, the speed change pulley 3 axis S ₁ of each of the other pulley 4b of the connecting gear pulley 4 and the output shaft S _3,
It is on the same second plane M ₂ perpendicular to S ₂ and S ₃ . Then, the first ring body 5 moves the speed change pulley 2 on the first plane M _1.
And the second ring body 6 is hung between the pulley 4b of the connected transmission pulley and the transmission pulley 3. Also, the first of the output shaft S ₃
An idler pulley 7 for supporting the first ring body 5 is rotatably provided on the plane M _{1 with} respect to the output shaft S ₃ via a bearing, and similarly to this, a second plane M ₂ of the input shaft S ₁ is provided.
An idler pulley 9 that supports the second ring body 6 is also provided on the upper portion of the input shaft S ₁ rotatably via a bearing.

The ring bodies 5 and 6 are used in FIG.
Alternatively, as shown in FIG. 6, it has a tapered surface T that contacts the speed change pulley, and the inner peripheral surface 200 has idler pulleys 7, 9
The one having a plane H that contacts with is used. By adopting the above-mentioned configuration, the power of the rotation of the input shaft is changed by the first ring body and further changed by the second ring body to reach the output shaft. The gear ratio of the second ring body 6 does not need to be so wide, and it is possible to cut the place where the effective diameter of the speed change pulley, which is a disadvantage of power transmission in the ring body made of a rigid body, is small. A system with good transmission efficiency can be obtained, and the transmission ratio can be wide enough in total of the two ring bodies.

Further, although each ring body is supported by the idler pulley in the present invention, the bending stress on the ring body can be reduced by providing the flat pulley, so that the bending stress on the ring body can be reduced and the same load can be applied. The transmission capacity is improved under the conditions. Further, in the above embodiment, the intermediate shaft S ₂ is provided with the connecting speed change pulley, but it is also possible to provide two speed change pulleys, and when the present system is used for driving an axle of an automobile or the like, the intermediate shaft S 2 is used. _On the first plane M ₁ of No. ₂ , the groove width of the pulley is narrow when the rotation is low as shown in FIG. 3, and as the rotation increases, the groove width becomes wider following the movement of the speed change pulley of the input shaft. Further, a speed change pulley having a torque transmitting portion for narrowing the groove width in consideration of the torque fluctuation is provided, and the input shaft S ₁ as shown in FIG. 2 is also received on the second plane M ₂ of the intermediate shaft S ₂ . As with the transmission pulley, a pulley having a wide groove width when the rotation speed of the shaft is low and the groove width being reduced as the rotation increases is provided.

[0015]

As described above, in the ring type transmission system of the present invention, the ring body made of a rigid body is hung between the pulleys, so that it is possible to obtain a transmission system with little wear and a long service life, and the input system. The structure is such that power is transmitted from the shaft to the output shaft via the intermediate shaft, the speed is changed once between the input shaft and the intermediate shaft, and then again between the intermediate shaft and the output shaft. It is not necessary to increase the gear ratio for each gear change, and the contact area between the ring body and the pulley is small in the area where the effective diameter of the pulley is small, which was a drawback of conventional ring type power transmission. It is possible to cut the place where the transmission efficiency has deteriorated. In addition, it is possible to increase the shift width by a total of two shifts. Further according to the invention, the input shaft,
The three shafts, the intermediate shaft and the output shaft, are arranged in a triangular shape, and the input shaft and the output shaft are also used as the shafts for installing the idler pulley to improve the transmission efficiency of the ring type power transmission. A more compact design is possible than when a separate shaft is provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a ring type transmission system according to the present invention.

FIG. 2 is a cross-sectional view of a speed change pulley provided on an input shaft.

FIG. 3 is a cross-sectional view of a speed change pulley provided on an output shaft.

FIG. 4 is a cross-sectional view of a coupled transmission pulley provided on an intermediate shaft.

FIG. 5 is a cross-sectional perspective view of an essential part showing an example of a ring body.

FIG. 6 is a cross-sectional perspective view of an essential part showing another example of a ring body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ring type speed change system 2 Speed change pulley 3 Speed change pulley 4 Connection speed change pulley 5 Ring body 6 Ring body 7 Idler pulley 9 Idler pulley 101 Fixed pulley piece 102 Movable pulley piece 104 Spline 108 Centrifugal thrust imparting material 110 Fixed pulley piece 112 Movable pulley piece 118 torque transmission part 119 spring 200 inner peripheral surface 201 fixed pulley piece 202 fixed pulley piece 203 movable pulley piece 204 left inclined surface 205 right inclined surface 206 sheave shaft S ₁ input shaft S ₂ intermediate shaft S ₃ output shaft T tapered surface

Claims (2)

[Claims] 1. A ring type transmission system comprising a ring body suspended between a plurality of transmission pulleys each comprising a fixed pulley piece fixed to a shaft and a movable pulley piece movable at least in the axial direction with respect to the shaft. The three shafts, the shaft, the intermediate shaft, and the output shaft, are arranged in a triangular shape, and the input shaft includes a speed change pulley on a first plane perpendicular to the shaft and an idler pulley on a second plane different from the first plane. The intermediate shaft has one shift pulley on each of the first plane and the second plane, and the output shaft has an idler pulley on the first plane and a shift pulley on the second plane. And a pulley group on the first plane and the second group.
A ring type speed change system characterized in that a ring body is hung on each of a group of pulleys on a plane. 2. The two speed change pulleys of the intermediate shaft each have a fixed pulley piece on both sides, and the movable pulley piece having conical surfaces on both sides is a connection speed change pulley that moves between the fixed pulleys on both sides. 1. The ring type speed change system according to 1.