JP2010038204A - Transmission belt and element for transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assemblability and productivity of a transmission belt by simplifying assembly of elements to be finally assembled. <P>SOLUTION: In this transmission belt 1, a plurality of elements 6 formed in a plate-like shape are annularly aligned opposing each other with matched attitudes and bundled by a ring 10. A protruding portion 7 is formed on the front of each element 6, and a recessed portion 8 fitted with the protruding portion 7 is formed on the back of each element 6. A guide face 14 is formed on at least one of a portion of a back face of one element 6L out of at least a pair of elements 6 adjacent with each other further on the inner peripheral side than the recessed portion 8, and a tip end of the protruding portion 7 of the other element 6F, upon relatively moving and assembling the other element 6F to the one element 6L from the inner peripheral side to the outer peripheral side so that the guide face 14 is inclined to gradually increase the interval between the elements 6F, 6L. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a belt for a transmission device such as a continuously variable transmission in which a large number of plate-like elements are arranged in an annular shape facing each other, and these elements are assembled into an annular shape by assembling them on an endless annular ring. And an element constituting the belt.

  A pressing belt is known as a belt used for a continuously variable transmission (CVT). In this type of belt, plate-like pieces called elements or blocks are arranged in an annular shape so that they face each other with their postures aligned and in contact with each other, and these pieces are made of an annular body called a ring or a hoop. It is configured by binding. The left and right sides of the small piece (hereinafter referred to as an element) are formed in a V-shape, and the V-shaped portion is a so-called flank surface that contacts the inner surface of the V groove in the pulley, where torque is transmitted. Is configured to do.

  When the belt configured as described above is sandwiched between pulleys, a force is exerted on the element to push it out to the outer peripheral side. Therefore, tension acts on the annular body (hereinafter referred to as a ring) that binds the elements. The element sandwiched between the pulleys rotates with the pulley, but since the belt is stretched between the driving pulley and the driven pulley, the element is pushed out of the pulley at the so-called linear portion, leading Press the element. The elements that are sequentially pressed in this way enter the V groove in the driven pulley and are sandwiched in the V groove, and rotate with the driven pulley to transmit torque to the pulley.

  Thus, the conventional CVT belt is mainly composed of a large number of elements and a ring for binding them. One example thereof is described in Patent Document 1. The belt described in Patent Document 1 is configured by arranging a ring on the outer peripheral side of elements arranged in a ring and binding the elements. That is, a ring recess is formed on the outer periphery of each element (the outer periphery in an annular arrangement, the same applies hereinafter), and hooks are formed on the left and right sides of the opening end to prevent the ring from coming off. Has been. A so-called bottom surface portion of the ring recess is a saddle surface with which the ring contacts, and a locking edge is formed at a position close to the saddle surface. This rocking edge is a ridge line portion that becomes the center when the elements rotate in the thickness direction in a state of being in contact with each other.

  That is, the elements arranged in a ring are arranged in a curved state along the ring, and in the curved portion, the elements are arranged in a so-called fan-shaped state, and for this purpose, the outer peripheral side of each element In contrast, the interval between the portions is increased, and the interval between the portions on the inner peripheral side (the inner peripheral side in the annular arrangement state, the same applies hereinafter) is reduced. Since the elements need to be rotated in this way while maintaining mutual contact, the locking edge that is the center of the rotation and where the contact is maintained is as close as possible to the saddle surface. Formed in position.

  Therefore, the portion on the inner peripheral side of the locking edge in each element is formed thinner than the portion on the outer peripheral side of the locking edge. Specifically, one surface called the main surface or the front is set back to the other surface called the back or the back.

  In addition, in the state where the CVT belt is wound around the pulley, the element is held by the clamping pressure by the pulley and the binding force by the ring, whereas each element is suspended by the ring between the pulleys. Or a state where the elements are sandwiched. That is, the load that restricts the movement of each element in the surface direction does not particularly act. Therefore, in order to regulate the relative position of each element in the surface direction, a convex portion called a dimple and a concave portion called a hole into which the convex portion is loosely fitted are provided. In the element described in Patent Document 1 described above, dimples are formed on the front surface (or main surface) on the inner peripheral side from the rocking edge, and holes are formed on the back side thereof. These dimples and holes are configured to maintain a fitted state both when the belt is wound around the pulley and when the belt is stretched between the pulleys and is linear. The tip projects beyond the locking edge.

JP 2008-51322 A

  The ring described above is a band-shaped material that is made of metal and has substantially no elasticity. The belt described in Patent Document 1 has a configuration in which the ring is arranged on the outer peripheral side of the element, and the saddle surface is provided on the inner side from the outer peripheral end, so that all the elements required as a belt are annularly formed. A ring cannot be wound around these elements in the arranged state. Therefore, to assemble the belt, a predetermined number of elements are assembled to the ring, and finally one element is pushed between the previously assembled elements.

  However, in the conventional belt described in Patent Document 1, since the dimple which is the protruding portion protrudes from the locking edge, when the last one element is assembled, the dimple is already assembled. Will be caught by the inner peripheral end of the element. In that case, if a large force is applied so as to widen the gap between the elements on both sides of the place where the last one element is pushed, so-called catching of the dimples can be eliminated and the assembly can be completed. However, this requires a large force and skill, so that the productivity or assembly of the belt is deteriorated.

  The present invention has been made paying attention to the above technical problem, and an object of the present invention is to provide a transmission belt having good assembling or productivity and an element therefor.

  In order to achieve the above object, the invention of claim 1 is arranged such that a plurality of elements formed in a plate shape are arranged in an annular shape facing each other with their postures aligned, and these elements are bound together by a ring. In addition, a convex portion is formed on the front surface of each element and a concave portion is formed on the rear surface to which the convex portion is fitted, and the arrangement state is curved in accordance with the ring while the elements are in contact with each other. In the transmission belt in which a locking edge serving as a center of rotation in the thickness direction is formed on the front surface or the back surface, the inner periphery in a state in which the convex portions and the concave portions are arranged in an annular shape rather than the locking edge. A portion of the at least one pair of elements formed on the side and adjacent to each other on the back surface of the one element on the inner peripheral side with respect to the recess, and the other When the other element is relatively moved from the inner peripheral side to the outer peripheral side with respect to the one element and assembled to at least one of the leading ends of the convex portions of the elements, the interval between these elements is gradually increased. Thus, the inclined guide surface is formed.

  According to a second aspect of the present invention, in the first aspect of the invention, the guide surface is formed on the inner peripheral side of the concave portion on the back surface of the one element, and the thickness of the one element is on the inner peripheral end side. The transmission belt is characterized by an inclined surface that becomes gradually thinner.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the guide surface is formed at a tip end portion of the convex portion of the other element, and a protruding length of the convex portion is an inner portion of the other element. It is a transmission belt characterized by being an inclined surface which becomes gradually long on the peripheral end side.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, in the state in which the ring recesses for housing the ring are arranged in the annular shape on the outer peripheral portion of the element arranged in the annular shape. It is the transmission belt characterized by opening and forming in the outer peripheral side.

  The invention according to claim 5 is a plate-shaped piece that is bound by a ring in a state of being arranged in an annular shape so as to face each other in a uniform posture, and forms a transmission belt, and a convex portion is formed on the front surface. In addition, a concave portion is formed on the back surface where the convex portion is fitted, and a locking edge serving as a center of rotation in the thickness direction when the arrangement state is curved in line with the ring in a state of contact with each other. Alternatively, in the transmission belt element formed on the back surface, the convex portion and the concave portion are formed on the inner peripheral side in the annularly arranged state with respect to the locking edge, and the rear surface is more inward than the concave portion. The interval between the small pieces is gradually increased when assembling at least one of the peripheral portion and the tip of the convex portion by moving the adjacent small pieces from the inner peripheral side to the outer peripheral side. And it is characterized in that it is formed inclined to have the guide surface so as to.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the guide surface is formed on the inner peripheral side of the concave portion on the back surface, and the thickness of the inner peripheral side portion is gradually reduced on the inner peripheral end side. It is an element for transmission belts characterized by being an inclined surface.

  A seventh aspect of the present invention is the inclined surface according to the fifth or sixth aspect, wherein the guide surface is formed at a tip portion of the convex portion, and the protruding length of the convex portion is gradually increased on the inner peripheral end side. It is an element for transmission belts characterized by being.

  The invention of claim 8 is the invention according to any one of claims 5 to 7, wherein the ring recesses for accommodating the ring are arranged on the outer circumference in the annular arrangement. The transmission belt element is characterized in that it is formed to open to the side.

  According to the belt according to the invention of claims 1 to 4 and the element according to claims 5 to 8, another element is arranged between the elements already assembled in the ring from the inner peripheral side in the annular arrangement state. When inserting, the convex portion of the other element may interfere with an already assembled element. In that case, the location where the convex portion interferes becomes the guide surface of the element already assembled, or the guide surface formed at the tip of the convex portion interferes with the already assembled element. The guide surface is a surface that acts to increase the distance between the already assembled elements as the other element is pushed in. More specifically, the guide surface is claimed in claim 2, claim 3, or claim 3. 5 or an inclined surface described in claim 7. Therefore, if the operation of pushing in the other element is performed, the other element can be inserted between the already assembled elements and assembled to the ring, and in addition to the operation, an operation of opening the interval between the elements can be performed. Since there is no need to perform other operations, the assembling work of the elements is simplified or facilitated, and as a result, the assembling performance or productivity of the entire belt can be improved.

  Next, the present invention will be described with reference to specific examples. The belt which is the object of the present invention is used for a continuously variable transmission (CVT) as an example, and is sandwiched in a winding groove having a V-shaped cross section formed on the outer peripheral portion of the pulley. The torque is transmitted by a frictional force generated between the pulley and the pulley. An example thereof is schematically shown in FIG. 6, and the belt 1 is wound around a driving pulley 2 and a driven pulley 3 constituting a continuously variable transmission. Each of these pulleys 2 and 3 is configured by disposing a fixed sheave and a movable sheave each having a tapered surface, and a winding groove 4 having a V-shaped cross section is formed between these sheaves. By moving the movable sheave back and forth with respect to the fixed sheave by an actuator 5 such as a hydraulic cylinder, the width of the winding groove 4 is changed.

  The belt to be used in the present invention used in this manner is formed by annularly binding a number of elements with a ring so that the entire belt has an annular shape and both side surfaces are V-shaped or tapered. ing. An example of the element 6 constituting the belt 1 shown in FIG. 6 is shown in FIGS. The elements 6 are metal plate-shaped pieces, and elements having the same shape and size are arranged in an annular shape with the same posture and facing each other. In order to maintain the vertical and horizontal relative positions of the elements 6 in the aligned state, a convex portion called a dimple 7 and a concave portion called a hole 8 into which the dimple 7 is loosely fitted are provided. 6 is formed at one location on both the front and back surfaces. Specifically, as one hole (assumed to be the back surface) of the element 6 is pressed and recessed in the thickness direction to form the hole 8, the dimple 7 protrudes from the back surface or the front surface. Is formed. Therefore, when the dimple 7 is fitted into the hole 8 of the adjacent element 6, the relative movement of the element 6 in the radial direction, that is, the vertical direction and the horizontal direction is restricted.

  Since the elements 6 are arranged in a ring shape, there is always a place where the elements 6 are arranged in a so-called fan-shaped (radial) open state around the center of curvature of the belt 1 without being parallel. A locking edge 9 is formed on the element 6 to allow a fan-shaped arrangement with the elements 6 in contact with each other. Specifically, the rocking edge 9 is a boundary line or a boundary region where the thickness of the element changes, and the width direction (a direction parallel to the rotation center axis of the pulley) is substantially at the center of the element 6 in the height direction. ).

  That is, in the state where the belt 1 is wound around the pulleys 2 and 3, the peripheral length on the upper side of the element 6 (the outer peripheral side as the belt 1) becomes longer. Since the circumference of the lower side of the element 6 (inner circumference side as the belt 1) becomes shorter, the interval between the elements 6 becomes narrower. Therefore, the lower portion of the element 6 is configured to be thin at the lower end side, and the portion where the plate thickness changes between the upper side and the lower side of the element is the locking edge 9. Accordingly, each element 6 rotates in the plate thickness direction around the rocking edge 9, that is, pitching occurs and opens like a fan as described above. The locking edge 9 only needs to be formed on either the front surface or the back surface. For example, the locking edge 9 is formed on the front surface from which the dimple 7 protrudes.

  Each element 6 has a saddle surface 11 on which a ring 10 is placed (arranged). Since the saddle surface 11 is in contact with a ring 10 that binds a large number of elements 6, the contact pressure increases when the belt 1 is transmitting torque, whereas the element 6 In the case where the pulleys 2 and 3 are wound around the pulleys 2 and 3 and opened in a fan shape from the linearly arranged state, sliding occurs between the ring 10 and the saddle surface 11 and accordingly, a large frictional force is generated. The saddle surface 11 is formed at a position as close as possible to the aforementioned locking edge 9 so that the moment due to the frictional force does not increase. Therefore, the saddle surface 11 is formed at a substantially central portion of each element 6 in the vertical direction.

  The ring 10 in the belt 1 targeted by the present invention is formed by laminating thin metal strips, and a plurality of (for example, two) rings 10 are arranged adjacent to the saddle surface 11 in the width direction. The elements 6 are configured to be bound together. In other words, the saddle surface 11 is formed with a width equal to or greater than the width of the two rings 10 arranged in parallel. Also in the belt 1 as an object of the present invention, the ring 10 is placed on the saddle surface 11 and the elements 6 are bound so that the elements 6 maintain an annular arrangement, and the elements 6 are radially outward. In addition, the element 6 is pulled out from the winding groove 4 when the element 6 is sent out from the winding groove 4 of the pulleys 2 and 3. Therefore, in order to prevent the ring 10 from coming out of the element 6 in the radial direction, a retaining portion 12 that holds the ring 10 in a state of being sandwiched between the saddle surface 11 is provided.

  To explain the example, in FIG. 1, hook portions 12 are provided on both the left and right sides of the element 6 as a retaining portion that extends upward from the saddle surface 11 and covers a part of the upper side of the saddle surface 11. As shown in FIG. 1, the hook portion 12 is a hook-shaped (inverted L-shaped) portion, and the left and right side edges of the ring 10 arranged in parallel to the saddle surface 11 are connected to the saddle surface 11. It is designed to be loosely sandwiched between the two. Therefore, the tip portions of the hook portion 12 are separated from each other, and an opening portion 13 for the saddle surface 11 is formed here. The interval between the hook portions 12, in other words, the opening width of the saddle surface 11 is wider than the width of one ring 10 and smaller than the sum of the widths of the two rings 10. The portion from the opening 13 to the saddle surface 11 corresponds to the ring recess in the present invention.

  As described above, the element 6 in the belt 1 according to the present invention has the dimple 7 and the hole 8 formed on the inner peripheral side (lower side in FIG. 1) of the rocking edge 9, and the dimple 7 and the hole 8 are formed. The thickness of the part which is made thin is thin, and the part of the outer peripheral side (upper side in FIG. 1) rather than the locking edge 9 is thick. In a state where the elements 6 are arranged in a straight line with the ring 10 being pulled in a straight line, the elements 6 are in contact with each other at a thick part, and the ring 10 is curved against this. However, when the elements 6 are arranged in a fan-like manner in accordance with the ring 10, the elements 6 come into contact with each other at the respective locking edges 9. In any of these cases, in order to maintain the dimple 7 fitted in the hole 8 of the adjacent element 6, the dimple 7 protrudes from the rocking edge 9 or the thicker portion on the outer peripheral side. ing. The amount of protrusion is indicated by “δ1” in FIG.

  On the other hand, the portion on the inner peripheral end side of the back surface where the hole 8 is formed, more specifically, the portion from the hole 8 to the inner peripheral end of the rear surface is gradually inclined on the inner peripheral end side. It is said that. When the dimple 7 of the adjacent element 6 is brought into contact with this inclined surface and the element 6 is pressed upward in FIG. 1B, the inclined surface is in a lateral direction (in FIG. This is a surface that generates a component force in the left-right direction in b) and increases the distance between the elements 6 by the component force. Therefore, this inclined surface corresponds to the guide surface 14 in the present invention.

  The guide surface 14 will be further described. The guide surface 14 functions particularly effectively when the last element 6 is assembled when the belt 1 is assembled. That is, when the last one element 6 is pushed between the previously assembled elements 6, the dimples 7 in the last one element 6 come into contact with each other. Specifically, the backward dimension δ2 of the back surface of the element 6 is larger than the protrusion amount δ1 of the dimple 7 described above. In other words, the dimension δ2 measured in the thickness direction between the back surface to which the locking edge 9 of the one element 6 to be assembled finally comes into contact and the lowermost end portion of the back surface is based on the protrusion amount δ1 of the dimple 7 described above. Is also getting bigger.

  The guide surface 14 does not need to be a flat surface, and may be a curved surface such as a convex curved surface or a concave curved surface as long as it can generate a component force in the lateral direction described above. Further, in FIG. 1B, the guide surface 14 is formed on the lower side from the lower end of the hole 8, but the guide surface 14 may be hung on the hole 8 or a predetermined dimension below the lower end of the hole 8. It may be formed below the side portion.

  Next, the operation due to the provision of the guide surface 14 described above will be described. In the belt 1 according to the present invention, the opening 13 is formed on the outer peripheral side of the elements 6 arranged in an annular shape, and the saddle surface 11 is open on the outer peripheral side. For this reason, the ring 10 cannot be wound around the elements 6 after arranging all the elements 6 necessary for constituting the belt 1 in a ring shape. Therefore, when the belt 1 is assembled, a predetermined number of elements 6 are assembled to the ring 10, or the ring 10 is assembled to the predetermined number of elements 6, and then the remaining elements 6 are sequentially assembled to the ring 10. Eventually, the last one element 6 is pushed in between the already assembled other elements 6 to assemble the element 6.

  In that case, since the width of the opening 13 is narrower than the total width of the two rings 10 arranged in parallel, one hook portion 12 of the last one element 6 is hooked on the side edge of one ring 10, The element 6 is rotated around the hooked portion, and at the same time, the two rings 10 are deflected, such as torsion, to reduce the entire width thereof. In this state, the two rings 10 are passed through the opening 13, and thus the last 1 The element 6 is assembled to the ring 10. The state of the process is indicated by a chain line in FIG.

  When one or more elements 6 to be assembled last are inserted between the elements 6 already assembled on the ring 10 in this way, the dimples 7 are moved from the locking edge 9 or the front of the element 6 as described above. Since it protrudes, the tip of the dimple 7 interferes with the element 6 already assembled. This state is shown in FIG. The example shown here is an example in which the last one element 6F is pushed between the other elements 6R and 6L that have already been assembled. When the last element 6F is inserted between the other elements 6R and 6L, the dimple 7 in the right element 6R in FIG. 2 contacts the rear surface thereof, and the dimple 7 in the last element 6F is in contact with the left element 6L in FIG. Interfere with. Since the other elements 6 that have already been assembled are closely assembled, such as being in contact with each other, it is difficult to increase the distance between the left and right elements 6R, 6L beyond that.

  However, in the belt 1 or element 6 according to the present invention, as shown in FIG. 2, the dimple 7 in the last element 6F contacts the guide surface 14 in the element 6L that has already been assembled. The guide surface 14 is an inclined surface as described above, and the last element 6F is relatively pushed upward in FIG. 2 to generate a component force that increases the distance between the elements 6F and 6L. It is configured. In other words, the dimple 7 in the last element 6F is not caught by the end surface on the inner peripheral side (lower end side in FIG. 2) of the element 6L in which the dimple 7 has already been assembled, and is guided obliquely upward in FIG.

  Therefore, if the last element 6F is further rotated in the clockwise direction from the state indicated by the chain line in FIG. 1A, the element 6L already assembled by the component force generated on the guide surface 14 is used. , 6R is pushed between the elements 6L, 6R while expanding the distance between them. Note that there are various behaviors for increasing the distance between the elements 6L and 6R, such as elastic deformation of the ring 10 and the element 6, and rotation around the locking edge 9 of the elements 6L and 6R that have already been assembled. This is thought to be due to the simultaneous occurrence of these.

  As described above, according to the belt 1 and the element 6 according to the present invention, the element 6L adjacent to the dimple 7 side with respect to the element 6F to be assembled lastly includes the guide surface 14 that is an inclined surface with which the dimple 7 is brought into contact. Therefore, if the last element 6F is pushed between the elements 6L and 6R that have already been assembled, the last element 6F can be assembled while expanding the distance between the elements 6L and 6R. Therefore, even if it is the last element 6F, even if pushing force becomes somewhat large, it can be assembled to the ring 10 by the same operation or operation as the other elements 6, and the operation becomes easy, and as a result, the belt 1 As a result, it is possible to improve the assembly or productivity as a whole.

  In addition, since the guide surface 14 exhibits a function at the time of the last assembly, the guide surface 14 may include all the elements 6, but at least one element 6 may be included. That's fine.

  The belt or belt element according to the present invention is configured to generate an action of expanding the distance between elements when another element is inserted between elements already assembled in the ring. In the above-described example, the effect is obtained by the guide surface formed on the inner peripheral side of the back surface of the element. However, the present invention can be applied to either one or both of the parts that interfere with each other during assembly. The structure which produces the effect | action similar to the guide surface 14 should just be provided. For example, a guide surface that produces the same action as the guide surface 14 may be provided at the tip of the dimple. An example is shown in FIG.

  In the belt 1 shown in FIG. 3, a guide surface 15 is formed at the tip of the dimple 7 in one element 6F to be assembled last, and the other elements 6 are not provided with a special configuration for assembly. This is an example of a normal shape. Although a side view is shown in FIG. 3, the shape of the elements 6F, 6 viewed from the front is the same as the shape shown in FIG. 1 (a), and therefore the configuration shown in FIG. Of these, the same parts as those shown in FIG. 1 or 2 are denoted by the same reference numerals as those in FIG.

  The guide surface 15 formed on the element 6F shown in FIG. 3 expands the distance between the elements 6L and 6R when the element 6F is pushed between the elements 6L and 6R already assembled to the ring 10. It is an inclined surface for generating a component force. Therefore, the guide surface 15 is a surface that is inclined so that a portion near the outer periphery of the element 6F arranged in an annular shape gradually approaches the front surface of the element 6F. In other words, the protruding length of the dimple 7 from the front is configured to be small on the upper side of FIG. 3 and gradually increase on the lower side of FIG. Preferably, the minimum protrusion length of the dimple 7 on the upper side in FIG. 3 is such that the entire dimple 7 completely enters the hole 8 of the adjacent element 6L in a state where the assembly is completed, and the last element 6F thereof. When assembling, the lower end portion on the back side of the adjacent element 6L has such a protruding length as to contact the surface of the guide surface 15 without interfering with the upper surface (outer peripheral surface) of the dimple 7 in FIG.

  FIG. 3 shows a state in which the last element 6F is assembled, and the guide surface 15 described above is formed at the tip of the dimple 7 in the element 6F. When the upper end side of the element 6F (the outer peripheral side in an annular arrangement state) is inserted between the already assembled elements 6L and 6R from the inner peripheral side of the ring 10, the rear surface is the right side in FIG. In contact with the dimple 7 in the element 6R, the guide surface 15 formed on the dimple 7 of the last element 6F comes into contact with the lower end corner portion on the back of the element 6L on the left side of FIG. The guide surface 15 is an inclined surface as described above, and the last element 6F is relatively pushed upward in FIG. 3 to generate a component force that increases the distance between the elements 6F and 6L. It is configured. In other words, the dimple 7 in the last element 6F is not caught by the end surface on the inner peripheral side (the lower end side in FIG. 3) of the element 6L that has already been assembled, and is guided obliquely upward in FIG.

  Therefore, if the last element 6F is further pushed in between the already assembled elements 6L and 6R, the component force generated on the guide surface 15 pushes the distance between the already assembled elements 6L and 6R. It is pushed in between these elements 6L and 6R while spreading. Note that there are various behaviors for increasing the distance between the elements 6L and 6R, such as elastic deformation of the ring 10 and the element 6, and rotation around the locking edge 9 of the elements 6L and 6R that have already been assembled. This is thought to be due to the simultaneous occurrence of these.

  As described above, even in the configuration shown in FIG. 3, since the guide surface 15 which is an inclined surface is formed on the dimple 7 of the element 6F to be assembled last, the last element 6F has already been assembled. If it pushes in between the elements 6L and 6R, the last element 6F can be assembled | attached, expanding the space | interval of these elements 6L and 6R. Therefore, even if it is the last element 6F, even if pushing force becomes somewhat large, it can be assembled to the ring 10 by the same operation or operation as the other elements 6, and the operation becomes easy, and as a result, the belt 1 As a result, it is possible to improve the assembly or productivity as a whole.

  The guide surface 15 formed on the dimple 7 is not particularly required to be a flat surface like the guide surface 14 formed on the lower end of the back surface of the element 6F described above, and is a curved surface such as a concave curved surface or a convex curved surface. In short, it may be any surface that can generate the lateral component force described above. An example of the guide surface 15 formed as a concave curved surface is schematically shown in FIG. 4, and an example of the guide surface 15 formed as a convex curved surface is schematically shown in FIG. In the example shown in FIG. 5, a spherical surface generated on the surface of the dimple 7 as a hemispherical protrusion is used as the guide surface 15.

  The present invention has been described with reference to the specific examples. However, the present invention is not limited to the specific examples described above, and the transmission belt according to the present invention is not limited to a belt-type continuously variable transmission, and includes a belt, a pulley, It is applicable also to the transmission belt of the other winding transmission device comprised by these.

It is a figure which shows the belt and an element, Comprising: (a) is a front view of an element, (b) is a side view of the last element. It is a side view which shows the state which has assembled the last element. It is a side view which shows the state which has assembled | attached the last element which formed the guide surface in the front-end | tip part of a dimple. It is a side view of the last element which shows the example which used the guide surface formed in the dimple as the concave curved surface. It is a side view of the last element which shows the example which made the guide surface formed in the dimple the convex curve. It is a figure which shows typically an example of a belt-type continuously variable transmission.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Belt, 2 ... Drive pulley, 3 ... Drive pulley, 4 ... Winding groove, 6F, 6L, 6R ... Element, 7 ... Dimple, 8 ... Hole, 9 ... Rocking edge, 10 ... Ring, 11 ... Saddle surface, δ1 ... projection amount, δ2 ... retraction dimension, 14,15 ... guide surface.

Claims (8)

A plurality of elements formed in a plate shape are arranged in an annular shape facing each other with their postures aligned, and these elements are bound together by a ring, and a convex portion is formed on the front surface of these elements and the back surface A concave portion into which the convex portion is fitted is formed, and the locking edge serving as the center of rotation in the thickness direction when the arrangement state is curved along the ring in a state where the elements are in contact with each other is the front surface or In the transmission belt formed on the back,
The convex portion and the concave portion are formed on the inner peripheral side in a state of being arranged in an annular form than the rocking edge,
The at least one of the rear surface of one element in at least one pair of elements adjacent to each other on the inner peripheral side of the concave portion and the distal end portion of the convex portion of the other element, with respect to the one element A transmission belt characterized in that a guide surface is formed so as to gradually increase the distance between the elements when the other element is assembled by moving relative to the outer peripheral side from the inner peripheral side.   The guide surface is an inclined surface which is formed on the inner peripheral side from the concave portion on the back surface of the one element, and the thickness of the one element is gradually reduced on the inner peripheral end side. The transmission belt according to 1.   The guide surface is an inclined surface that is formed at a tip portion of a convex portion in the other element, and a protruding length of the convex portion is gradually increased on the inner peripheral end side in the other element. The power transmission belt according to claim 1 or 2.   2. A ring recess for receiving the ring is formed in an outer peripheral portion of the element in an annular arrangement, and is open to an outer peripheral side in the annular arrangement. 4. The power transmission belt according to any one of 3 to 3. Plate-shaped small pieces that are arranged in an annular shape facing each other with their postures aligned, forming a transmission belt by forming a transmission belt, and having a convex portion on the front and a convex on the back. A locking edge is formed on the front surface or the back surface as a center of rotation in the thickness direction when the concave portion is fitted and the arrangement state is curved along the ring in contact with each other. In transmission belt elements,
The convex portion and the concave portion are formed on the inner peripheral side in a state of being arranged in an annular form than the rocking edge,
At the time of assembling by moving relative to the adjacent small piece from the inner peripheral side to the outer peripheral side with respect to at least one of the inner peripheral side of the concave portion and the tip end portion of the convex portion on the back surface. An element for a transmission belt, characterized in that a guide surface that is inclined so as to gradually increase the distance between them is formed.   6. The guide surface according to claim 5, wherein the guide surface is an inclined surface that is formed on an inner peripheral side of the concave portion on the back surface, and a thickness of the inner peripheral side portion gradually decreases on an inner peripheral end side. Element for transmission belt as described. The transmission according to claim 5 or 6, wherein the guide surface is an inclined surface that is formed at a tip portion of the convex portion, and a protruding length of the convex portion is gradually increased on the inner peripheral end side. Belt element.   8. The ring recess for accommodating the ring is formed in the outer peripheral portion in the annularly arranged state so as to open to the outer peripheral side in the annularly arranged state. An element for a transmission belt according to any one of the above.

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