JPH06147275A - Annular type power transmission body and power transmission device - Google Patents

Abstract

PURPOSE:To reduce the occurrence of wear at the high bearing part of a block body and to improve power transmission capacity of a belt and provide an increased life for the belt by a method wherein a pair of annular bodies being rigid as a tension carrier and positioned facing each other are used to prevent the occurrence of a trouble when a flexible tension carrier is used and a block body is accurately moved over a determined course on the annular body. CONSTITUTION:A head 8 is formed to the body 6 of a block body through a pillar 7 and a plurality of block bodies 2 having slot parts 9 formed between the body 6 and the head 8 are arranged in parallel. The block bodies are mounted on a tension carrier 3 to form an annular type power transmission body 1. The used tension carrier 3 forms a pair of rigid annular bodies 4 positioned facing each other. The block bodies 2 are movably arranged such that the pillar 7 of the block body is nipped between the annular bodies 4. A high molecular resilient substance is mounted on the pulley contact surface of the block body, and metal surface treatment having self-lubricity is applied between the block body and the annular body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring type power transmission body and a power transmission device, and more particularly to a ring type power transmission body and a drive shaft for use in vehicles such as automobiles and various mechanical transmissions.
The present invention relates to a power transmission device in which a speed change pulley is arranged on a driven shaft, and a ring type power transmission body is attached between these pulleys so that the rotation of the drive shaft can be continuously changed and transmitted to the driven shaft.

[0002]

2. Description of the Related Art Conventionally, power transmission systems for high load transmission belts are generally classified into two types: push transmission and tension transmission. Among them, the push transmission type is a structure in which a plurality of block bodies are attached to an endless multi-layer steel band in a state of being in contact with each other, and these block bodies are slidable, for example, US Pat. No. 3,720,113. It is disclosed in the specification and the like.

This transmission system generally has a structure in which the block body is not fixed to the endless band but slidably arranged on the endless band. When the block body is hung on both the driving and driven pulleys, The block bodies gather on the loose side of the belt, and the block bodies gathered on the loose side of the belt are pushed from the block bodies hanging on the drive pulley to rotate the driven pulley.

In such a block body, a trapezoidal main body having an end face that abuts on a pulley and a triangular head are connected via a pillar, and a slot portion is provided on the left and right of the pillar where endless bands are installed. It has become. The main body has a taper surface on the front surface, the thickness of which gradually decreases downward, and an inclination start line that is the start position of the taper surface is located slightly below the shoulder surface. Generally, the tapered surface allows the block body rotating on the pulley to be inclined in the traveling direction according to the curvature thereof.

[0005]

However, the above-mentioned tension-bearing member, which is an endless band, is formed by laminating 10 to 15 plies of steel bands, and there is a difference in circumferential length between the lowermost layer and the uppermost steel band. Since there was a difference in tension between the steel bands, it was easy to cut the bottom and top steel bands. In addition, each steel band has a thickness that can cope with bending stress at the minimum radius of curvature of the pulley, but the steel band of the lowermost layer or the uppermost layer is subjected to severe friction and wear due to contact with the block body, It had shortened its life. Moreover, while the belt is running, the centrifugal force of the block body increases in proportion to the square of the belt speed, which increases the tension of the endless band, which causes great fatigue to the endless band and also increases the loss horsepower. The power transmission capacity of the belt has decreased.

Further, when the belt is separated from the pulley, the belt is bent more than necessary and is bent so that the inner peripheral surface becomes largely convex, which gives bending fatigue to the endless band, shortens its life, and further increases power. I could not communicate efficiently. Also, in order to reduce the pitch noise generated when the block running on the belt collides with the pulley, measures such as reducing the thickness of the block body were made, but this did not result in a significant reduction and was put to practical use. Was not always enough.

Further, in the case of a transmission body made of such a metal member, there is a problem in that lubrication with oil must always be carried out and the transmission device itself becomes large.
The present invention is to improve the disadvantages when using such a flexible tension carrier, using a pair of rigid opposing ring bodies as the tension carrier, and the block body on the ring body. By moving the designated course accurately, the wear of the block body at the high surface pressure part is reduced, the power transmission capacity and life of the belt are extended, and the noise during running is greatly reduced. .

[0008]

The feature of the present invention resides in that a plurality of block bodies in which a head is formed in the body of the block body via a pillar and a slot portion is provided between the body and the head. In a ring type power transmission body in which the tension carriers are attached to a tension carrier, and the tension carriers are a pair of rigid opposing ring bodies. According to the ring type power transmission body, at least the pillars of the block body are sandwiched by each block body so that each block body is movably arranged, and a polymeric elastic body is attached to the pulley contact surface of each block body. This includes the case where the ring body is fitted in the slot portion provided in the block body, and the case where the head of the block body is fitted in the groove-shaped passage provided in the ring body facing each other.

Further, the ring type power transmission device of the present invention is
A drive pulley and a driven shaft are each provided with a fixed pulley piece, and a variable speed pulley comprising a movable pulley piece that is installed opposite to the fixed pulley piece so as to be slidable in the longitudinal direction of the shaft. In a power transmission device in which a power transmission body is hung on the grooved portion, the fixed pulley pieces mounted on the drive shaft and the driven shaft are arranged on the same side with respect to the power transmission body, and the block body is used as the power transmission body. A head is formed in the main body of the block via pillars, and a plurality of block bodies having slot portions provided between the main body and the head are arranged in parallel with each other with a gap or in close contact with each other. A ring type power transmission body in which each block body is movably arranged by sandwiching the head between a pair of rigid rigid ring bodies is used, and an idler is engaged with the ring type power transmission body. That.

[0010]

In the present invention, the block body slides on the ring body which is the tension carrier and presses the adjacent block body to transfer the power between the pulleys mounted on the drive shaft and the driven shaft. At this time, since the course of the block body is on the rigid ring body, even if the block body moves along a predetermined course and comes into contact with the block body located in front, the wear of the block body at the high surface pressure portion is reduced. Further, the ring body is not affected by the centrifugal force of the block body due to the belt speed, and bending is not generated when the ring body is separated from the pulley, so that the power transmission efficiency is improved. Furthermore, since a polymeric elastic body is mounted on the contact surface of the block with the pulley, pitch noise during traveling can be reduced. Further, since the contact surface between the block body and the ring body is subjected to a self-lubricating metal surface treatment, it can be applied to a transmission mechanism that does not require oil lubrication.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. A ring-type power transmission body 1 shown in FIG. 1 is a main part of a belt according to the present invention, and a plurality of block bodies 2 are sandwiched between a pair of rigid ring bodies 4 and 4 which are rigid as tension bearing bodies 3. The block body 2 is movable. In this case, the block bodies 2 may be spaced from each other or may be arranged in close contact with each other.

As shown in FIG. 2, the block body 2 has a bilaterally symmetrical shape and has a pulley contact surface 5 that engages with the wall surface of the V pulley.
A main body 6 having a bar, a rod-shaped pillar 7 located substantially in the center, a rectangular head 8, and a pair of slot portions 9 for accommodating the ring body 4. The slot portion 9 has a shoulder surface 10 that carries the ring body 4. Further, a polymer elastic body 5a is attached to the pulley contact surface 5, and the contact surface 8a of the head 8 with the ring 4 and the contact surface 7a of the pillar 7 with the ring 4 and the shoulder surface 10 are self-supporting. Metal surface treatment with lubricity is not well done. Hard rubber, hard urethane, and other elastomers are used as the polymeric elastic body 5a. An uneven pattern is formed on the metal surface of the block body 2 to which the polymeric elastic body 5a is attached, and uncrosslinked rubber or urethane is installed. It is fixed by a method of cross-linking the rear rubber or urethane or a method of adhering and fixing with an adhesive. Examples of the metal surface treatment having self-lubricating property include Teflon processing, composite plating treatment of nickel and Teflon particles, and ceramic vapor deposition treatment. On the other hand, the front surface and the rear surface of the main body 6 have tapered surfaces 20 whose thickness gradually decreases from the top of the head 8 downward. This tapered surface 20
Are inclined according to the diameter of the ring body 4.

As shown in FIGS. 3 and 4, the ring body 4 is a circular body, and the head 8 of the block body is fitted to the inner sides 23 facing each other, and the ring body 4 has a groove shape for surely guiding the block body 2. A passage 24 is provided, while the outer side 25 of the ring body is provided with an outer wall 26 that does not contact the pulley wall surface and an inclined surface 27 that reduces weight.
It consists of The block pillar 7 and the head 8 are sandwiched between the pair of ring bodies 4 and 4, and the head 8 is provided with a passage 24.
, The bottom surface 28 of the ring body is rested on the shoulder surface 10 of the block body. Moreover, the ring bodies 4, 4
The gaps 29 are provided on the surfaces of the ring body 4 facing each other.
The heat generated by the friction of the block body 2 is more easily released.

FIG. 5 shows another embodiment, in which the block body 2 used has the same shape as that of FIG. 2, but the bottom surface 28 of each ring body is a curved surface, and sliding with the shoulder surface 10 is good. I have to. FIG. 6 shows still another embodiment, in which the pair of ring bodies 4 and 4 sandwich only the pillar 7, so that the pillar 7 of the block body is slightly longer. Of course, the block body 2 used in the present invention may have a left-right asymmetric shape, and the angles of the left and right pulley contact surfaces 5, 5 may be different.

The block body 2 slides on the ring body 4, which is a tension carrier, and presses the front block body 2 to transfer power between the pulleys mounted on the drive shaft and the driven shaft. At this time, since the course of the block body 2 is on the rigid ring body 2, the block body 2 moves reliably and accurately on a predetermined course, and even if it comes into contact with the block body 2 located in front, the belt width direction and the belt thickness Since it does not move in the direction, it is not necessary to provide projections or depressions on the block body. In any of the embodiments, a polymeric elastic body 5a is mounted on the contact surface of the block body with the pulley, and the ring body 4 of the block body 2 is mounted.
The contact surface with and the contact surface of the ring body 4 with the block body 2 are subjected to a metal surface treatment having a self-lubricating property.

FIG. 8 is a sectional view of a ring type power transmission device according to the present invention. The power transmission device 35 according to the present invention is applied to a continuously variable transmission (CVT) mounted on a two-wheeled vehicle, an automobile, an agricultural machine, or the like, and as shown in the drawing, indirectly on a crankshaft of an engine or the like. The drive shaft 36 and the driven shaft 37 connected to each other are arranged in parallel with each other, and the transmission pulleys 38 and 39 are indirectly connected to the shafts 36 and 37, respectively.
Is mounted, and the ring type power transmission body 1 is suspended between both pulleys 38 and 39. Moreover, the idler 40 holds the ring type power transmission body 1 by engaging with the inner peripheral surface of the ring type power transmission body. This position is preferably on the tight side of the ring type power transmission 1.

Here, each of the speed change pulleys 38, 39 comprises a fixed pulley piece 41 and a movable pulley piece 42 slidably installed on the fixed pulley piece 41, and the ring type power transmission body 1 has both sides. It is suspended in a symmetrical groove formed by the pulley pieces. The fixed pulley piece 41 is arranged on the same side as the ring type power transmission 1. Therefore, the movable pulley piece 42 is on the same side, and the widthwise dimension of the power transmission device is reduced.

Among the above, in the speed change pulley 38 mounted on the drive shaft 36, the fixed pulley piece 41 is provided on the drive shaft 3.
6, the movable pulley piece 42 is fitted on the sheave shaft 43 of the fixed pulley piece 41 at the position opposed to the fixed pulley piece 6, and at the same time fitted on the spline or the sliding key 44, rotating with the sheave shaft 43 and axially. It is also slidable.

A hydraulic cylinder portion 45 is provided on the back of the movable pulley piece 42. The hydraulic cylinder portion 45 is defined by a fixed plate 46 fixed to the sheave shaft 43 of the fixed pulley piece and a cylindrical side wall 47 of the movable pulley piece, and the internal pressure is changed by the supply and discharge of fluid such as hydraulic oil as a pressure medium. However, the movable pulley piece 42 is movable in the direction of the arrow in the figure. A packing is attached to the top surface of the fixing plate 46.

The hydraulic oil passes through a fluid passage 48 provided in the drive shaft 36, a through hole 49 provided between the drive shaft 36 and the sheave shaft 43, a supply port 50 provided in the movable pulley piece 42, and a hydraulic cylinder. It is supplied to the section 45.

On the other hand, in the speed change pulley 39 mounted on the driven shaft 37, the fixed pulley piece 41 is fixed to the driven shaft 37, and on the other hand, the movable pulley piece 42 faces the sheave shaft 43 of the fixed pulley piece 41. A symmetrical groove portion is formed which is fitted on the ring-shaped power transmission body 1 and engages with it. The movable pulley piece 42 is slidable on the sheave shaft 43 of the fixed pulley piece so as to be movable in the axial direction. To the right of the movable pulley piece 42, a flange-shaped stopper 54 is provided with a sheave shaft. Two coil springs 55 and 56 having a large diameter and a small diameter are fixed between the stopper 54 and the movable pulley piece 42 while pressing the movable pulley piece 42 toward the fixed pulley piece 41. There is.

Further, the driven shaft 37 is provided with a fluid passage 59 like the drive shaft 36, and supplies working oil to the sliding portions between the respective members to improve lubricity. In the figure, reference numeral 58 is a torque transmission portion having a cam mechanism, which promotes the thrust of the movable pulley piece 42.

The means for pressing the movable pulley piece 42 in the direction of the fixed pulley piece 41 is not limited to hydraulic pressure, springs, or torque cams. Means may be used.

In this device, however, the ring type power transmission body is changed by supplying hydraulic oil to the hydraulic cylinder portion 45 provided on the movable pulley piece 42 of the speed change pulley 38 mounted on the drive shaft 36 to change the internal pressure thereof. 1 can be moved from the low speed position shown in FIG. 9 to the high speed position shown in FIG. In this case, since the drive shaft 36, the driven shaft 37 and the idler 40 are fixed, the center position of the ring type power transmission body 1 moves in an oblique direction.

[0025]

As described above, according to the present invention, the block body slides on the ring body which is the tension carrier and presses the adjacent block body so that the power between the pulleys mounted on the drive shaft and the driven shaft is When the block body is delivered, the course of the block body is on a rigid ring body at this time, so the high surface pressure portion of the block body is surely moved even if the block body moves in a predetermined course and contacts the block body located in front. There is no tiny movement in and wear is reduced. In addition, since the block body does not move in the width direction and the thickness direction of the belt, it is not necessary to provide the engaging means for the protrusion or the dent portion, so that the structure is simple.

Further, the ring body is not affected by the centrifugal force of the block body due to the belt speed, and the bending is not generated when the ring body is separated from the pulley, so that the power transmission efficiency is improved. Furthermore, since a polymeric elastic body is attached to the contact surface of the block body with the pulley, pitch noise between the block body and the pulley can be considerably suppressed, and a self-removal between the block body and the ring body is possible. Since the lubricated metal surface treatment has not been required to lubricate with oil, the transmission using this ring type power transmission can be a transmission with a simpler structure without the lubrication mechanism. it can.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a ring type power transmission body according to the present invention.

FIG. 2 is a perspective view of a block body used for the ring type power transmission body of the present invention.

FIG. 3 is a perspective view of one ring body used in the ring type power transmission body of the present invention.

FIG. 4 is a perspective view of the other ring body used in the ring type power transmission body of the present invention.

FIG. 5 is a sectional view of another ring-type power transmission body according to the present invention.

FIG. 6 is a sectional view of still another ring type power transmission body according to the present invention.

FIG. 7 is a side view of still another ring type power transmission body according to the present invention.

FIG. 8 is a cross-sectional view of a power transmission device according to the present invention.

FIG. 9 is a side view of the power transmission device according to the present invention in a low speed state.

FIG. 10 is a side view of the power transmission device according to the present invention in a high speed state.

[Explanation of symbols]

 1 Ring-type power transmission body 2 Block body 3 Tension carrier 4 Ring body 5 Pulley contact surface 5a Polymer elastic body 6 Main body 7 Pillar 7a Ring contact surface 8 Head 8a Ring contact surface 9 Slot portion 9a Contact surface with ring 20 Tapered surface 21 Inclination start line 24 Passage 35 Power transmission device 36 Drive shaft 37 Driven shaft 38 Speed change pulley 39 Speed change pulley 40 Idler 41 Fixed pulley piece 42 Movable pulley piece

Claims (4)

[Claims] 1. A head is formed on a main body of a block body through a pillar, and a plurality of block bodies provided with a slot portion between the main body and the head are arranged in parallel with each other with a gap or in close contact with each other. In a ring-type power transmission body in which these are mounted on a tension carrier, the tension carriers are a pair of rigid opposing ring bodies, and at least pillars of the block body are sandwiched by the ring bodies to form each block body. Is movably arranged, and a polymer elastic body is attached to the pulley contact surface of each block body, and at least one of the contact surface of each block body with the ring body or the contact surface of the ring body with the block body A ring-type power transmission characterized in that a metal surface treatment having self-lubricating property is applied to the. 2. The ring type power transmission body according to claim 1, wherein the heads of the block bodies are fitted into groove-shaped passages provided in the ring bodies facing each other. 3. The ring-type power transmission body according to claim 1, wherein the pair of ring bodies are fitted in the slots provided in the block body. 4. A speed change pulley comprising a fixed pulley piece and a movable pulley piece arranged opposite to the fixed pulley piece so as to be slidable in the longitudinal direction of the shaft, is attached to the drive shaft and the driven shaft, respectively. In a power transmission device in which a power transmission body is hung on a groove formed by both pulley pieces, a fixed pulley piece mounted on the drive shaft and a driven shaft is arranged on the same side with respect to the power transmission body. A head is formed on the main body of the block body as a transmission body via a pillar, and a plurality of block bodies provided with a slot portion between the main body and the head are arranged in parallel with each other with a gap or in close contact with each other, At least a pillar of a block body is sandwiched between a pair of rigid ring-shaped opposing ring bodies, and a ring-type power transmission body in which each block body is movably arranged is used, and an idler is attached to the ring-type power transmission body. Power transmission device characterized by the combination.