JP4858462B2 - Transmission belt - Google Patents

Description

  The present invention relates to a transmission belt configured by arranging a large number of plate-like elements facing each other in an annular shape and assembling these elements into an endless ring by assembling them on a ring.

  Generally, as a transmission that is used when power is transmitted between a plurality of rotating members, a stepped transmission that can change a gear ratio stepwise, and a gear ratio that changes continuously, that is, steplessly. There are known continuously variable transmissions, and belt-type continuously variable transmissions, toroidal-type continuously variable transmissions, and the like are known as the latter continuously variable transmission. Of these, the belt-type continuously variable transmission is a transmission that uses two sets of pulleys, a driving pulley and a driven pulley, and a transmission belt wound around these pulleys to change the gear ratio steplessly. is there. As a power transmission belt used in such a belt-type continuously variable transmission, for example, a large number of plate pieces called elements or blocks are arranged in an annular shape by overlapping each other in the plate thickness direction. A belt formed into an endless ring shape is known by binding the ring in a ring shape with a ring or band or carrier called a carrier.

  When the drive pulley is driven in a state in which such a transmission belt is wound around two sets of pulleys on the drive side and the driven side, the friction force of the contact portion between the element and the drive side pulley is applied to the element, In addition, a compressive force is applied in the element stacking direction, that is, in the thickness direction of the element, applied to the element from the driving pulley according to the torque of the driving pulley. Then, the compressive force transmitted to the element in contact with the driving pulley is transmitted to the element in contact with the driven pulley via the element not wound around the pulley. When a compressive force is transmitted to the element in contact with the driven pulley, the driven pulley is rotated in accordance with the frictional force of the contact portion between the element and the driven pulley and the transmitted compressive force. Torque is generated. In this way, power is transmitted between the driving pulley and the driven pulley via the transmission belt.

  An example of the transmission belt as described above is described in Patent Document 1. The high load transmission belt described in Patent Document 1 is a transmission belt including a center belt and a block that reinforces side pressure resistance, and specifically, two belts having a locking portion at the upper end. Both sides of the belt and the block (element) formed by the connecting member that connects them at the lower end, and the engagement groove (opening recess of the element) that is open between the both engagement portions of the element It is constituted by two rows of endless carriers (rings) fitted so as not to be detached from the element by the portion. The front and rear surfaces of the two belt side portions of the element are respectively provided with a convex portion and a concave portion, and the convex portion and the concave portion are fitted between the front and rear elements, so that the element is attached to the belt. They are arranged even while driving.

JP 2000-205342 A

  The transmission belt described in the above-mentioned Patent Document 1 is formed with a locking portion that locks the ring and the element on the belt side portions on the left and right ends of the element. A concavity and convexity part for fitting is formed to fit each other between adjacent elements. That is, the concave and convex portions for fitting are provided in two places symmetrically on both sides of the element. A transmission belt is configured by fitting two rows of rings into an opening recess formed between the side portions of the belts and assembling them so as to be locked by the locking portions.

  In such a transmission belt, when the elements are assembled to the ring, or when the elements assembled to the ring are removed from the ring, it is necessary to make a part of the rings arranged in two rows overlap each other. is there. That is, when an element is assembled to or removed from the two rows of rings, the two rows of rings are twisted and overlapped with each other so that the width of the two rows of rings is between the locking portions of the elements. It is necessary to make it narrower than the opening width.

  In order to twist the two rows of rings so that they overlap each other, adjacent elements need to be rotated relative to each other, that is, rolled. However, since the transmission belt described in Patent Document 1 has two uneven portions that are fitted to each other between adjacent elements on the left and right sides of the element, the operation of the elements in the rolling direction is restricted. End up. As a result, it is difficult to make the two rows of rings overlap each other, and there is a possibility that the transmission belt cannot be assembled.

  On the other hand, for example, as shown in FIG. 6, by adopting an element in which an uneven portion that fits between adjacent elements is provided only at one central portion in the width direction of the elements, The applicant has filed a separate application for a configuration that allows rolling and allows the elements and the two rows of rings to be easily assembled with the two rows of rings overlapping each other.

  In the transmission belt having the configuration shown in FIG. 6, the elements can be rolled as described above, and the assembly of the elements and the two rows of rings can be facilitated. On the other hand, when the belt is running with torque transmitted by the transmission belt, the straightness of the transmission belt in the direction of belt travel may be reduced in the linear running state of the transmission belt where the transmission belt is not wrapped around the pulley. There is. That is, as shown in FIG. 6, since the concave and convex portions for fitting which are positioned between adjacent elements are provided on the inner peripheral side with respect to the locking edge of the element, in the linear running state of the transmission belt, The fitting of the concave and convex portions for fitting becomes shallow. Moreover, the clearance between the concave and convex portions for fitting also increases cumulatively. As a result, for example, as shown in FIG. 7, in the linear running state of the transmission belt, the elements meander in the traveling (running) direction of the belt, and the linearity of the transmission belt may be reduced. there were.

  Note that by reducing the clearance δ of the fitting portion between the opening recess and the two rows of rings, the relative movement in the width direction between the element and the ring can be restricted, and the straightness of the transmission belt can be improved. The fitting portion between the opening recesses and the two rows of rings needs to secure a space for facilitating the assembly of the two rows of rings in the opening recesses. It cannot be reduced to such an extent that it can contribute to the improvement in straightness of the transmission belt.

  As described above, in the conventional transmission belt configured by assembling the element having the opening recess and the two rows of rings, the assembly is facilitated to improve the assembling property, and the linear traveling state during belt traveling is improved. There was still room for improvement in order to improve the straightness of the power transmission belt.

  The present invention has been made paying attention to the above technical problem, and provides a transmission belt capable of easily and surely assembling the element and the ring and improving the straight running performance during belt running. It is intended to do.

  In order to achieve the above-mentioned object, the invention according to claim 1 is provided with recesses for accommodating strip-shaped rings arranged in parallel in a plurality of rows in the width direction, and on the opening end sides of the left and right inner wall surfaces in the recesses. A large number of plate-like elements formed with left and right retaining portions for engaging and disengaging the plurality of rows of rings are arranged in an annular shape so that the opening end side is the outer peripheral side. In the transmission belt in which the plurality of rows of rings are fitted and assembled to the inner peripheral side of the both retaining portions in the row of elements arranged in a row, the left and right retaining portions are arranged between openings facing each other. And a holding ring for restricting relative movement in the width direction between the element and the ring in the recess is attached to the outer peripheral side of the ring.

  According to a second aspect of the present invention, in the first aspect of the present invention, the clearance between the opening in the width direction of the opening and the holding ring is such that the recess in the width direction of the recess and the plurality of rows It is a transmission belt characterized by being smaller than the clearance between the ring.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the holding ring is mounted substantially at the center in the width direction in a state where the plurality of rings are arranged in parallel. It is a belt.

  According to invention of Claim 1, many elements connected by the ring of several rows are connected so that an element can be rolled between adjacent elements. Therefore, a plurality of rows of rings can be fitted and engaged with the inner peripheral side of both retaining portions in the concave portion of the element while rolling the element, and the elements and the plurality of rows of rings can be easily assembled. Then, when the element moves relative to the ring in the width direction between the opening portions where the left and right retaining portions are opposed to each other and on the outer peripheral side of the ring, the leading end surfaces of the retaining portions are in contact with each other. A holding ring for restricting the relative movement is attached. In other words, the holding ring is further stacked and mounted between the front end surfaces of the left and right retaining portions on the outer peripheral side of the plurality of rows of rings that connect a large number of elements in an annular shape. Therefore, in the state in which the multiple rows of rings are fitted in the recesses of the elements, the relative movement between the multiple rows of rings and the elements in the width direction of the transmission belt is restricted, and as a result, the belt in which the transmission belt transmits torque The straightness of the transmission belt during traveling can be improved.

  According to the invention of claim 2, in the state where the holding ring is laminated between the front end surfaces of the left and right retaining portions on the outer peripheral side of the plurality of rows of rings, between the recesses and the plurality of rows of rings. Clearance (ie, the difference between the distance between the left and right inner wall surfaces facing each other in the recess and the total width of the plurality of rows of rings) is greater than the clearance between the opening and the retaining ring (ie, facing each other in the recess). The shape and dimensions of each part are set so that the difference between the distance between the front end surfaces of the left and right retaining parts and the width of the retaining ring becomes small. Therefore, the fitting portion between the opening and the retaining ring having a small clearance can be functioned as positioning in the width direction when the belt is running, and the straightness of the transmission belt can be further improved.

  According to the invention of claim 3, the holding ring laminated between the front end surfaces of the left and right retaining portions on the outer peripheral side of the plurality of rows of rings is the ring in a state where all of the plurality of rows of rings are arranged in parallel. Located in the middle part of the width. Therefore, in a state where a plurality of rows of rings are fitted in the recesses of the element, the plurality of rows of rings can be arranged and held in the central portion in the width direction of the recesses, and as a result, the straightness of the transmission belt can be improved. The balance can be improved.

  Next, the power transmission belt targeted by the present invention will be specifically described with reference to the drawings. 1 and 2, the transmission belt V is wound around, for example, a driving side (input shaft) pulley and a driven side (output shaft) pulley of a belt type continuously variable transmission, and power is transmitted between these pulleys. The example of the belt which transmits is shown. And many elements E in this invention consist of a plate-shaped member made of metal, for example, and the left and right side surfaces 1 and 2 in the width direction (x-axis direction in FIG. 1) are tapered inclined surfaces. It has a formed main body (base body) portion 3, and both side surfaces 1, 2 inclined in a tapered shape are belt winding grooves of a pulley 4 that is a driving pulley or a driven pulley of a belt type continuously variable transmission ( V-shaped groove) 4a is a torque transmission surface that frictionally contacts and transmits torque.

  At both left and right ends in the width direction of the main body 3 (x-axis direction in FIG. 1), a part of the main body 3 and above the element E in the vertical direction (y-axis direction in FIGS. 1 and 2) Left and right column parts 5 and 6 are formed respectively. Accordingly, the upper end surface 3a which is the upper edge portion in FIGS. 1 and 2 of the main body portion 3, and the left and right inner wall surfaces 5a and 6a facing the center in the width direction of the main body portion 3 of both pillar portions 5 and 6; Thus, a recess 7 is formed which is open on the upper side of element E (upper side in the y-axis direction in FIG. 1), that is, on the outer peripheral side of transmission belt V.

  The concave portion 7 is formed by inserting two strips (or two strips) of rings R for closely binding the elements E arranged in an annular shape in an annular shape into the inner side thereof and arranging them in parallel in two rows in the width direction. Therefore, the upper end surface 3a is a saddle surface 3a on which the inner peripheral surface of the ring R is placed in contact.

  The ring R is formed, for example, as a so-called laminated ring 13 or 14 in which a thin annular ring (single ring) made of metal is laminated in a radial direction, and each single ring in the laminated rings 13 and 14 is The superposed state or the laminated state is maintained by the tension of each single ring or the frictional force between the single rings.

  At the upper end portions of the left and right column portions 5 and 6, left and right retaining portions 8 and 9 having left and right distal end surfaces 8a and 9a extending toward the center in the width direction of the main body 3 are respectively provided on both column portions 5. , 6 are integrally formed. In other words, on the left and right inner wall surfaces 5a, 6a on the opening end of the recess 7 (the end on the outer peripheral side of the transmission belt V in the recess 7), on the center side in the width direction of the recess 7 (x-axis direction in FIG. 1). The retaining portions 8 and 9 facing each other are formed.

Thus, the bottom 7a (i.e. saddle surface (upper surface) 4a) of the recess 7 side, both the inner wall surfaces 5a facing each other, the distance W ₁ between 6a the inner width W ₁ of the recess 7 is determined. On the other hand, on the opening end side of the recess 7, the opening width W ₂ in the opening 7 b of the recess 7 is determined by the distance W ₂ between the two front end faces 8 a and 9 a facing each other.

  Here, the aforementioned ring R is constituted by two rows of laminated rings 13 and 14 as described above, and therefore, each laminated ring 13 and 14 is partially partially in the radial direction (that is, in the circumferential direction). By overlapping each other in the thickness direction), as the ring R, the stacked ring 13 and the stacked ring 14 are overlapped in the radial direction, and the stacked ring 13 and the stacked ring 14 are aligned in the width direction. The parallel state can be set at the same time.

The ring R is the total width of the ring R in the parallel state (i.e., width the sum of the width and the laminated rings 14 of the laminated ring 13) D ₁ is wider than the opening width W _2, and inner width W ₁ to be narrower than the width dimension of the laminated rings 13, 14, and the shape and dimensions of each part of the concave portion 7 is formed is set. Further, by making the overlapping state of the ring R, so that it can be narrower than the temporary opening width W ₂ of the full width of the ring R, the width of the stacked rings 13, 14, and each part of the recess 7 The shape and dimensions are set and formed.

  Therefore, by setting the ring R in the overlapped state, the portion in the overlapped state can be fitted into the recess 7 between both the front end surfaces 8a and 9a of the recess 7, that is, through the opening 7b. Then, after passing the overlapped portion of the ring R through the opening 7b and fitting into the recess 7, the element E is moved to the parallel portion of the ring R, or the recess 7 of the ring R is fitted. By returning the portions to the parallel state, the ring R is locked by the inner peripheral portions of the two retaining portions 8 and 9 in the recess 7 to prevent the ring R from being detached from the recess 7, that is, the ring R Can be fitted into the recess 7 for engagement.

Further, a clearance δ1 is provided in the width direction of the transmission belt V at a fitting portion between the concave portion 7 and the ring R in a state where the ring R in parallel is fitted in the concave portion 7 of the element E. That is, the clearance .delta.1 is expressed as the difference between the total width _{D 1} of the inner width _{W 1} and the ring R in the recess 7 (i.e., _{"δ1 = (W 1 -D 1)} / 2 "), the ring into the recess 7 It is set to a predetermined dimension for facilitating the assembly of R.

  A large number of elements E constituting the transmission belt V are bound by a ring R in an annular arrangement, and are wound around the pulleys 4 on the driving side and the driven side in this state. Therefore, in the state of being wound around the pulley 4, each element E needs to spread out in a fan shape with respect to the center of the pulley 4 and be in close contact with each other. A portion (a portion on the center side in an annular arrangement) is formed thin.

  That is, on one surface of the main body 3 (for example, the left surface in the z-axis direction in FIG. 2), the lower portion is scraped off from the position of the saddle surface 3a in the vertical direction of the element E. It has become. Therefore, in a state where each element E spreads out in a fan shape and contacts with each other, in other words, in a belt curved state where each element E is wound around the pulley 4 and arranged in a circular arc shape and the transmission belt V is curved, Touch at the changing boundary. The edge of this boundary portion is a so-called rocking edge 10.

  Since the saddle surface 3a of this type of element E is in contact with the ring R that binds many elements E, the contact pressure increases when the transmission belt V is transmitting torque. On the other hand, when the element E is wound around the pulley 4 from the state where the elements E are arranged in a straight line and opened in a fan shape, sliding occurs between the ring R and the saddle surface 3a due to sliding, and accordingly, a large friction is generated. Power is generated. At this time, if the distance between the saddle surface 3a and the locking edge 10 in the vertical direction of the element E is long, the moment due to the frictional force between the ring R and the saddle surface 3a increases, and the ring R and the saddle surface Sliding by sliding more easily occurs with 3a. As a result, the friction loss during operation of the transmission belt V may increase and the transmission efficiency of the transmission belt V may decrease.

  Therefore, as described above, the rocking edge 10 is formed at the same position as or substantially the same as the position of the saddle surface 3a in the vertical direction of the element E, that is, without offset from the position of the saddle surface 3a in the vertical direction of the element E. By doing so, the moment due to the frictional force between the ring R and the saddle surface 3a can be reduced as much as possible. As a result, the friction loss during operation of the transmission belt V is reduced and the transmission of the transmission belt V is reduced. Efficiency can be improved.

  A dimple 11 and a hole 12 for determining the relative position of each element E are formed in the central portion of the element E in the width direction of the main body 3. Specifically, a frustoconical dimple 11 that is convex on one surface side of the main body 3 (in the example of FIG. 2, the surface side with the locking edge 10) is formed. A bottomed cylindrical hole 12 for loosely fitting (free fitting) the dimple 11 in the adjacent element E is formed on the surface opposite to the dimple 11.

  Therefore, when these dimples 11 and the holes 12 are fitted between the elements E adjacent to each other, the relative positions of the elements E in the horizontal direction and the vertical direction in FIG. 1 can be determined. However, as described above, in the element E in the present invention, the dimple 11 and the hole 12 are formed on the inner peripheral side with respect to the locking edge 10, so that the transmission belt V is not wound around the pulley 4 when the belt is running. In the portion where the belt V is in the straight running state, there is a possibility that the straight running performance of the transmission belt V with respect to the belt traveling direction may deteriorate.

  That is, when each element E is wound around the pulley 4 and arranged in an arcuate shape, that is, the front surface 11a and the hole 12 on the side where the dimple 11 is formed (left side in the z-axis direction in FIG. 2) Each element E is wound around the pulley 4 as compared with the fitted state of the dimple 11 and the hole 12 when the formed side (the right side in the z-axis direction in FIG. 2) is in contact with the rear surface 12a. When they are arranged in a straight line without being hooked, that is, when there is a distance between the front surface 11a and the rear surface 12a, the fitting between the dimple 11 and the hole 12 becomes unavoidably shallow. As a result, the positioning function between the elements E adjacent to each other due to the fitting of the dimples 11 and the holes 12 is lowered, and the straightness of the transmission belt V during belt running is lowered.

  Therefore, the transmission belt V according to the present invention is easily and reliably assembled with a number of elements E and a plurality of rows of rings R to improve the assembly performance of the transmission belt V, and at the same time, the transmission belt V during belt running. In order to improve the straight traveling performance of the present invention, between the element E and the ring R constituting the transmission belt V of the present invention, specifically between the opening 7b of the recess 7 of the element E and on the outer peripheral side of the ring R. In addition, a holding ring 15 for restricting relative movement in the width direction between the element E and the ring R in the recess 7 is mounted.

  More specifically, as shown in FIG. 1, the holding ring 15 is between the openings 7 b of the recess 7, that is, between the tip surfaces 8 a and 9 a of the both retaining portions 8 and 9 that are opposite to each other. On the outermost peripheral surface of the ring R, it is mounted in a state where it is arranged in a stacked manner at approximately the center in the width direction of the ring R. In addition, the holding ring 15 is a single row (or a single strip) of ring-shaped rings. In the example shown in FIG. 1, like the ring R, that is, the laminated rings 13 and 14, for example, a metal ring-shaped thin belt-shaped ring. The body (single ring) is formed as a laminated ring in which a plurality of layers are stacked in the radial direction. Accordingly, the holding ring 15 and the ring R are held in a stacked state by the tension of the holding ring 15 and the frictional force between the holding ring 15 and the ring R.

The width D ₂ of the retaining ring 15 is set to be slightly narrower than the opening width W ₂ of the opening 7b. Specifically, in the state in which the holding ring 15 is positioned between the openings 7b, the fitting portion between the opening 7b and the holding ring 15 has the above-described recess 7 and ring R in the width direction of the transmission belt V. A clearance δ2 smaller than the clearance δ1 of the fitting portion is provided. That is, the clearance .delta.2 is expressed as the difference between the width _{D 2} of the opening width _{W 2} and the holding ring 15 of the opening 7b of the recess 7 (i.e., _{"δ2 = (W 2 -D 2)} / 2 "). The clearance δ2 allows the holding ring 15 to be mounted between the openings 7b without interfering with the front end surfaces 8a, 9a of the both retaining portions 8, 9 of the recess 7. It is set to a predetermined dimension that can function as positioning in the width direction of the ring R in the concave portion 7 of the element E.

  Therefore, in a state where the holding ring 15 is mounted, when the element E and the ring R move relative to each other in the width direction, any one of the side surfaces 13a (or 14b) of the ring R and any one of the inner wall surfaces 5a (or Prior to the contact with 6a), any one of the side surfaces 15a (or 15b) of the ring 13 comes into contact with any one of the front end surfaces 8a (or 9a). That is, when any one of the side surfaces 15a (or 15b) of the ring 13 is in contact with any one of the front end surfaces 8a (or 9a), the relative movement in the width direction between the element E and the ring R is restricted. Therefore, the arrangement of the ring R in the recess 7 of the element E is always held so as to be positioned at the center in the width direction of the recess 7. In other words, an aligned state is maintained such that the center in the width direction of the element E always coincides with the circumferential direction of the ring R. As a result, as shown in FIG. 3, the straightness of the transmission belt V is good when the belt is running. For example, when the belt-type continuously variable transmission is operated, rattling of the transmission belt V is prevented. Thus, the transmission belt V can be driven stably.

  4 and 5 show another embodiment of the transmission belt V according to the present invention. While the holding ring 15 in the transmission belt V shown in FIGS. 1 and 2 is an example of a single row (one strip) of metal laminated rings, the transmission belt V shown in FIG. As in the case of the two rows of stacked rings 13 and 14 of the ring R, an example is shown in which the holding ring in the present invention is configured by two rows of metal stacked rings.

  That is, in FIG. 4, of the two rows of laminated rings 13 and 14 constituting the ring R, on the outer peripheral side of the laminated ring 13, a metal annular thin strip (single ring) is overlaid in multiple layers in the radial direction. The stacked ring 21a is stacked and attached. On the other hand, on the outer peripheral side of the laminated ring 14, a laminated ring 21 b in which a metallic thin annular strip (single ring) is laminated in a radial direction in a plurality of layers is laminated and attached. The laminated ring 21a and the laminated ring 21b constitute a holding ring 21 according to the present invention. The holding ring 21 is located between the openings 7b of the element E, that is, both the retaining portions 8 and 9 are mutually connected. It is mounted between the opposed front end surfaces 8a, 9a on the outermost peripheral surface of the ring R and in the center of the ring R in the width direction in a stacked manner.

  As described above, even when the holding ring 21 is divided into two rows and stacked on the ring R and mounted, the same effect as that obtained when the above-described one row of holding rings 15 is mounted can be obtained. Further, the holding rings 15 and 16 are formed of the same material as the ring R or a material having the same strength and elasticity as the holding ring 15 and the holding ring 21, so that the strength of the holding rings 15 and 21 is increased. The strength of the ring R can be increased. As a result, the strength and durability of the transmission belt V can be improved, and the transmission torque capacity of the transmission belt V can be increased.

  In addition, while the holding rings 15 and 21 in the transmission belt V shown in FIGS. 1, 2, and 4 are examples of a laminated ring made of the same material or the same metal as the ring R, The transmission belt V shown in FIG. 5 shows an example in which the holding ring according to the present invention is configured by an elastic member having a high expansion / contraction rate.

  That is, in FIG. 5, between the opening 7 b of the element E, that is, between the tip surfaces 8 a and 9 a facing each other, both on the outermost peripheral surface of the ring R and on the ring R. A holding ring 31 made of, for example, rubber or resin and formed of an annular belt-like body is stacked and mounted at substantially the center in the width direction.

  Thus, by forming the holding ring 31 with an elastic member having a high expansion / contraction rate, it is possible to obtain the same effect as the case where the holding rings 15 and 21 are mounted, and the holding ring 31 has high expansion / contraction. By having a rate, the degree of freedom during assembly can be increased.

  As described above, according to the transmission belt V of the present invention, a large number of elements E connected by two rows of rings R are connected so that the elements E can be rolled between adjacent elements E. . Therefore, two rows of rings R can be fitted and engaged with the inner peripheral side of both retaining portions 8 and 9 in the concave portion 7 of the element E while rolling the element E, and the elements E and the two rows of rings R can be engaged. Can be assembled easily. The holding rings 15, 21, 31 are provided between the front end faces 8 a, 9 a of the left and right retaining portions 8, 9 on the outer peripheral side of the two rows of rings R that connect the multiple elements E in a ring shape. Furthermore, it is laminated and mounted. Therefore, relative movement between the two rows of the rings R and the elements E in the width direction of the transmission belt V is restricted in a state in which the two rows of the rings R are fitted in the recesses 7 of the elements E. As a result, the transmission belt It is possible to improve the straightness of the transmission belt E when the belt travels where E transmits torque.

Further, in the state where the holding rings 15, 21, 31 are stacked between the front end surfaces 8 a, 9 a of the left and right retaining portions 8, 9 on the outer peripheral side of the two rows of rings 2, the recesses 7 and the two rows of rings The difference between the clearance δ1 between R and the distance W ₁ (ie, the inner width W ₁ ) between the left and right inner wall surfaces facing each other in the recess 7 and the total width D ₁ of the two rows of rings R than half), the clearance between the opening portion 7b and the retaining ring 15,21,31 .delta.2 (i.e., the distance _{W 2} between the left and right front end surfaces 8a, 9a opposite to each other in the recess 7 (i.e. the opening width _{W 2} ) And the width D ₂ of the retaining rings 15, 21, 31 are reduced so that the shape and dimensions of each part are set. Therefore, the fitting portion between the opening 7b where the clearance δ2 is small and the holding rings 15, 21, 31 can be functioned as positioning in the width direction during belt running, and the straightness of the transmission belt V can be improved. This can be further improved.

The retaining rings 15, 21, and 31 are arranged at the center portion of the entire ring width D ₁ in a state where all the two rows of rings R are arranged in parallel. Therefore, in a state where the two rows of rings R are fitted in the recesses 7 of the element E, the two rows of rings R can be arranged and held in the central portion in the width direction of the recesses 7, and as a result, the width The transmission belt V can be run under good straightness with a good left / right balance in the direction.

  The present invention is not limited to the specific examples described above. That is, in the above-described specific example, the ring R that constitutes the transmission belt V of the present invention together with the element E shows an example in which four rings are laminated in the drawing, and the retaining ring 15 in the present invention, 21 shows an example in which a ring is constituted by three layers in the drawing, but the ring R or the retaining rings 15 and 21 in the present invention may be a multi-layer or a single layer other than four layers or three layers. The ring R or the holding rings 15 and 21 may be used.

  Moreover, in the specific example mentioned above, although the ring R was shown in the example which was paralleled in 2 rows, the ring R of this invention is the lamination | stacking which paralleled in multiple rows, such as 3 rows or 4 rows, in addition to 2 rows. It may be a ring.

  Moreover, in the specific example mentioned above, although the transmission belt V of this invention has shown the example used for the belt-type continuously variable transmission, for example, the transmission belt V of this invention is a belt-type continuously variable transmission. Not limited to this, the present invention can also be applied to a transmission belt of another winding transmission device constituted by a transmission belt and a V pulley.

It is a schematic diagram which shows the structure of the power transmission belt which concerns on this invention, Comprising: It is a front view of the power transmission belt. It is a schematic diagram which shows the structure of the power transmission belt which concerns on this invention, Comprising: It is a partial sectional side view of the power transmission belt. It is a schematic diagram for demonstrating the linearity of the belt at the time of employ | adopting the power transmission belt which concerns on this invention. It is a schematic diagram which shows the other structure of the power transmission belt which concerns on this invention. It is a schematic diagram which shows other structure of the power transmission belt which concerns on this invention. It is a schematic diagram which shows the structure of the conventional power transmission belt. It is a schematic diagram for demonstrating the rectilinear advance of the belt by the conventional power transmission belt.

Explanation of symbols

  E ... element, R, 13, 14 ... ring, V ... transmission belt 5a, 6a ... inner wall surface, 7 ... recess, 7b ... opening, 8, 9 ... retaining part, 8a, 9a ... tip surface, 15, 21 , 31 ... Retaining ring.

Claims (3)

Recesses for forming strip-shaped rings in parallel in a plurality of rows in the width direction are formed, and the plurality of rows of rings are engaged with the opening end sides of the left and right inner wall surfaces of the recesses to prevent the left and right A large number of plate-like elements formed with retaining portions are arranged in an annular shape so that the opening end side is on the outer peripheral side, and the inner periphery of the retaining portions in the row of the annularly arranged elements In the transmission belt assembled by fitting the multiple rows of rings on the side,
A holding ring for restricting relative movement in the width direction of the element and the ring in the concave portion is mounted between the openings where the front end surfaces of the left and right retaining portions face each other and on the outer peripheral side of the ring. Transmission belt characterized by being made.   The clearance between the opening in the width direction of the opening and the holding ring is smaller than the clearance between the recess in the width direction of the recess and the plurality of rows of rings. The transmission belt according to 1.   The power transmission belt according to claim 1, wherein the holding ring is attached at a substantially center in a width direction in a state where the plurality of rows of rings are arranged in parallel.

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