JP2008151266A - Endless belt for power transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endless belt for power transmission capable of preventing deterioration in the yawing attitude of elements adjacent to each other in a belt traveling direction even if the elements have relative position errors in the belt width direction, thereby preventing reduction in the torque capacity of belt power transmission and deterioration in transmission efficiency. <P>SOLUTION: The endless belt 40 for transmission includes a plurality of the elements 42 having convex parts 56 formed on front surfaces and concave parts 58 formed on rear surfaces, and an annular strip 46 for supporting the elements 42. The elements 42 are arranged in a face-to-face relation so that the convex parts 56 can be inserted in the concave parts 58. The endless belt 40 is extended through a pair of variable pulleys 20, 30. Each concave part 58 and each convex parts 56 are so shaped that, even if one of the adjacent elements 42 is displaced relatively in the belt width direction, the minimum value of a clearance L between the concave part 58 and the convex part 56 in a direction perpendicular to both the belt traveling direction and the belt width direction is substantially equal to the minimum value of the clearance L when the element 42 is not displaced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an endless belt for power transmission in which a plurality of elements are supported by an annular belt-like member and wound between a pair of variable pulleys.

  In an endless belt for power transmission in which a plurality of elements are supported by an annular belt-shaped member and wound around a pair of variable pulleys, the element includes a main body portion that receives a clamping pressure from the pair of variable pulleys, and a neck portion on the main body portion. And a head portion connected through the. In the element having such a configuration, a convex dimple is formed on one surface (front surface) side of the head, and a concave hole is formed on the other surface (back surface) side and at the same position as the dimple. Is formed.

  Therefore, the elements adjacent to each other in the belt traveling direction are configured to travel in a state where dimples can be inserted into the holes, thereby positioning the elements adjacent to each other in the belt traveling direction. Such dimples and holes are both of the same shape and are often circular (see, for example, Patent Document 1). However, in order to regulate relative rotation between adjacent elements, the belt width In some cases, the elliptical shape is long in a direction orthogonal to both the direction and the belt traveling direction (see, for example, Patent Document 2).

  By the way, for example, at the inlet of the variable pulley having a small rotation diameter of the belt (upstream side in the belt traveling direction), the pitching posture is inclined backward due to the difference in the relative speed with the belt-like member at the element engaged with the variable pulley. The state occurs, and the inner peripheral upper surface portion of the rear surface (back surface) of the preceding element comes into contact with the upper surface portion of the dimple outer periphery of the front surface (front surface) of the subsequent element. At this time, if there is a relative position error in the belt width direction in the dimples and holes of the front and rear elements, the load application point of the element bitten by the variable pulley is greatly deviated from either of the hole center to the belt width direction. As a result, the yawing posture is deteriorated, and the torque capacity of the belt power transmission and the transmission efficiency are lowered.

Both the dimples and the holes described in Patent Document 1 and Patent Document 2 have the same shape, and the contact surfaces when tilted backward (the outer peripheral upper surface portion of the dimple and the inner peripheral upper surface portion of the hole) are arcuate surfaces (dimples are dimples). If the dimples and holes of the front and rear elements adjacent to the belt traveling direction have a slight relative position error in the belt width direction, the top surface of the dimple outer periphery And the contact position between the upper surface portion of the inner periphery of the hole and the center of the hole are greatly deviated in the belt width direction, and the yawing posture is deteriorated. That is, it cannot be said that the elements described in Patent Document 1 and Patent Document 2 have an effective shape from the viewpoint of suppressing deterioration of the yawing posture.
JP-A-2-225840 JP 11-108122 A

  Therefore, in view of the above circumstances, the present invention can suppress deterioration of the yawing posture of the element even if there is a relative position error in the belt width direction in the element adjacent to the belt traveling direction, and decrease the torque capacity of belt power transmission. Another object of the present invention is to obtain an endless belt for power transmission that can suppress a decrease in transmission efficiency.

  In order to achieve the above object, the power transmission endless belt according to claim 1 of the present invention has a convex portion formed on one surface and a concave portion formed on the other surface, and the concave portions are mutually connected. And a plurality of elements arranged side by side so that the convex portions can be inserted to each other and an annular belt-like member that supports the plurality of elements, and is endless for power transmission wound around a pair of variable pulleys In the belt, the shape of the concave portion and the convex portion is the concave portion in a direction orthogonal to both the belt traveling direction and the belt width direction even when one of the adjacent elements is relatively displaced in the belt width direction. The minimum value of the clearance of the convex portion has a shape that is substantially the same value as the minimum value of the clearance when the positional deviation does not occur.

  According to the first aspect of the present invention, even if there is a relative position error in the belt width direction in an element adjacent to the belt traveling direction, the load application point of the element is not greatly deviated from the center of the recess when the element is tilted backward. Therefore, deterioration of the yawing posture can be suppressed. Therefore, it is possible to suppress a decrease in torque capacity and transmission efficiency in belt power transmission.

  The power transmission endless belt according to claim 2 of the present invention has a convex portion formed on one surface and a concave portion formed on the other surface, and the convex portions can be inserted into the concave portions. An endless belt for power transmission that has a plurality of elements arranged in parallel with each other and an annular belt-like member that supports the plurality of elements, and is wound between a pair of variable pulleys, the element being a belt The surface of the concave portion that contacts the convex portion and the surface of the convex portion that contacts the concave portion when tilted backward with respect to the traveling direction are both convex curved surfaces.

  According to the second aspect of the present invention, even if there is a relative position error in the belt width direction in the element adjacent to the belt traveling direction, the load application point of the element is difficult to be displaced from the center of the recess when tilting backward. Therefore, deterioration of the yawing posture can be suppressed. Therefore, it is possible to suppress a decrease in torque capacity and transmission efficiency in belt power transmission.

  In the power transmission endless belt according to claim 3 of the present invention, the convex portion is formed on one surface, the concave portion is formed on the other surface, and the convex portions can be inserted into the concave portion. An endless belt for power transmission that has a plurality of elements arranged in parallel with each other and an annular belt-like member that supports the plurality of elements, and is wound between a pair of variable pulleys, the element being a belt One of the surface of the concave portion that contacts the convex portion and the surface of the convex portion that contacts the concave portion when tilted backward with respect to the traveling direction is a convex curved surface, and the other surface is It is characterized by having a planar shape.

  According to the third aspect of the present invention, even if there is a relative position error in the belt width direction in an element adjacent to the belt traveling direction, the load application point of the element is difficult to shift from the center of the recess when tilting backward. Therefore, deterioration of the yawing posture can be suppressed. Therefore, it is possible to suppress a decrease in torque capacity and transmission efficiency in belt power transmission.

  As described above, according to the present invention, even if an element adjacent to the belt traveling direction has a relative position error in the belt width direction, deterioration of the yawing posture of the element can be suppressed, and the torque capacity of belt power transmission is reduced. Further, it is possible to provide an endless belt for power transmission that can suppress a decrease in transmission efficiency.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below in detail based on the embodiments shown in the drawings. FIG. 1 is a schematic front view showing the configuration of a pair of variable pulleys (input side variable pulley 20 and output side variable pulley 30) in a belt type continuously variable transmission (hereinafter referred to as “CVT”) 10 for a vehicle. FIG. 2 is a schematic perspective view showing a configuration of a power transmission endless belt (power transmission belt 40) wound around the pair of variable pulleys. For convenience of explanation, arrow UP is upward, arrow DO is downward, arrow LE is leftward, arrow RI is rightward, arrow FR is forward, and arrow RE is backward.

  As shown in FIG. 1, the CVT 10 includes an input shaft 12 that is rotatably supported by a housing (not shown) via a bearing (not shown), and a housing that is parallel to the input shaft 12. The output shaft 14 is rotatably supported by a bearing (not shown) through a bearing (not shown), the input side variable pulley 20 supported by the input shaft 12, and the output side variable pulley 30 supported by the output shaft 14. And a transmission belt 40 (endless belt for power transmission) wound around the input-side variable pulley 20 and the output-side variable pulley 30.

  The input shaft 12 is connected to a prime mover (not shown) via a torque converter or the like, and the output shaft 14 is operatively connected to a drive wheel (not shown) via a reduction gear or a differential gear device. Then, the rotational power is transmitted from the input side variable pulley 20 to the output side variable pulley 30 by the transmission belt 40. That is, when the input shaft 12 rotates, the input side variable pulley 20 is rotationally driven, and when the output side variable pulley 30 is rotationally driven via the transmission belt 40, the output shaft 14 rotates. .

  The input-side variable pulley 20 is a fixed sheave 22 that is a disk-like fixed rotating body fixed to the input shaft 12, and faces the fixed sheave 22, and cannot rotate relative to the input shaft 12 around the axis. A movable sheave 24, which is a disc-shaped movable rotating body provided to be movable in the axial direction (left-right direction), and a hydraulic actuator (not shown) provided to the input shaft 12 to apply thrust to the movable sheave 24 ) And.

  Similarly, the output-side variable pulley 30 faces a fixed sheave 32 that is a disk-shaped fixed rotating body fixed to the output shaft 14, and faces the fixed sheave 32, and cannot rotate relative to the output shaft 14 around the axis. In addition, a movable sheave 34 that is a disk-like movable rotating body provided so as to be movable in the axial direction (left-right direction), and a hydraulic actuator provided on the output shaft 14 to apply thrust to the movable sheave 34 (Not shown).

  Further, in the input side variable pulley 20, the surfaces of the fixed sheave 22 and the movable sheave 24 facing each other gradually increase in distance from the rotation center (input shaft 12) toward the radially outer side (outer peripheral edge side). A conical belt sliding surface 26 is formed, and a V groove 28 around which the transmission belt 40 is wound is formed between the belt sliding surfaces 26.

  Similarly, in the output side variable pulley 30, the surfaces of the fixed sheave 32 and the movable sheave 34 facing each other are gradually spaced from each other toward the radially outer side (outer peripheral edge side) from the rotation center (output shaft 14). A conical belt sliding surface 36 is formed, and a V-groove 38 around which the transmission belt 40 is wound is formed between the belt sliding surfaces 36.

  As shown in FIG. 2, the transmission belt 40 has a substantially bowl shape, and a thin belt-like belt block 42 (element) arranged in a ring shape by arranging a large number (a plurality) in the thickness direction (belt traveling direction). ), And a pair of left and right endless hoops 46 (band-like members) that are disposed in engagement grooves 44 formed on both sides of a neck portion 54 to be described later of the belt block 42 and that support the belt block 42. ) And.

  The belt block 42 is made of metal (steel) from the viewpoint of strength. The pair of left and right hoops 46 is also made of metal, and is a metal ring assembly formed by laminating a plurality of thin metal rings. Further, oil passages 16 through which oil flows in and out are respectively formed on the movable sheave 24 side of the input shaft 12 and the movable sheave 34 side of the output shaft 14.

  In the CVT 10 configured as described above, when the movable sheaves 24 and 34 move in the axial direction (left and right direction), the width of the V groove 28 of the input side variable pulley 20 and the width of the V groove 38 of the output side variable pulley 30 change. In addition, the effective diameters of the input side variable pulley 20 and the output side variable pulley 30 (the rotation diameter of the transmission belt 40) can be adjusted. In other words, this allows the gear ratio γ (γ = rotational speed of the input shaft 12 / rotational speed of the output shaft 14) of the CVT 10 to be changed steplessly (stepless speed change is possible).

  Next, the belt block 42 (element) according to the present embodiment will be described in detail. FIG. 3A is a schematic front view of the belt block 42, and FIG. 3B is a schematic side view of the belt block 42.

  As shown in FIG. 3, the belt block 42 includes a head 50 having a substantially isosceles triangle shape in front view, a main body portion 52 having a substantially isosceles trapezoidal shape in front view, and the head portion 50 and the main body portion 52 in the left-right direction. A neck portion 54 that is integrally connected to the central portion, and the head portion 50 and the main body portion 52 extend in the left-right direction (width direction) by a predetermined length. The main body 52 extends longer than the head 50 in the left-right direction by a predetermined length, and the head 50 slides on the belt sliding surface 26 of the input-side variable pulley 20 and the belt on the output-side variable pulley 30. The moving surface 36 is not touched.

  In addition, gaps formed on both sides of the neck portion 54 in the left-right direction and between the head portion 50 and the main body portion 52 are formed as engagement grooves 44, and left and right of the connecting portion between the neck portion 54 and the head portion 50. On both sides in the direction and on both sides in the left and right direction of the connecting portion between the neck portion 54 and the main body portion 52, a substantially arc-shaped cutout portion 48 is formed. The belt block 42 and the hoop 46 are prevented from being separated from each other by the hoop 46 entering the engaging groove 44.

  A cylindrical (circular shape in front view) dimple 56 (convex portion) protruding a predetermined height is formed at the front side central portion of the head 50, and the dimple 56 of the dimple 56 is formed at the rear side central portion of the head 50. A concave hole 58 (concave portion) having an inner diameter that is slightly deeper than the protruding height and larger than the outer diameter of the dimple 56 is formed.

  The hole 58 has a convex curved surface shape formed by a circular arc with each side convex radially inward (center side of the hole 58) in front view, and each corner (each vertex) is radially outward. It is a convex curved surface shape made of a circular arc (arc having a larger curvature than each side), and has a substantially asteroid shape formed so that each side and each corner is smoothly continuous. Thus, the dimples 56 of the belt block 42 on the rear side in the belt traveling direction (front-rear direction) can be inserted.

  Next, the operation of the belt block 42 (element) configured as described above will be described. As shown in FIGS. 1 and 2, a large number (a plurality) of belt blocks 42 are supported by a hoop 46 and wound between the input-side variable pulley 20 and the output-side variable pulley 30. At this time, especially in the belt linear portion where the transmission belt 40 travels linearly, each belt block 42 adjacent in the belt traveling direction (front-rear direction) travels while the dimples 56 are inserted into the holes 58.

  Here, the operation of the dimple 56 and the hole 58 will be described in comparison with the conventional dimple 156 and the hole 158. 4A is an explanatory diagram of the conventional dimple 156 and the hole 158, and FIG. 4B is an explanatory diagram of the dimple 56 and the hole 58 of the present embodiment. In addition, in this way, in the conventional belt block 142 shown in FIG. 4 (A), parts equivalent to those of the belt block 42 of the present embodiment are denoted by reference numerals added with 100, and detailed description thereof is omitted. .

  In FIG. 4, the dimples 56 and 156 of the belt blocks 42 and 142 on the rear side (rear side) in the belt moving direction are inserted into the holes 58 and 158 of the belt blocks 42 and 142 on the front side (leading side) of the belt. In the belt blocks 42 and 142 on the subsequent side, only the dimples 56 and 156 are shown. Further, the arrow X direction shown in FIG. 4 indicates the belt width direction, and the arrow Y direction indicates a direction orthogonal to both the belt width direction and the belt traveling direction.

  As shown in FIG. 4A, the dimple 156 of the conventional belt block 142 has a cylindrical shape, and the hole 158 has an inner diameter larger than the outer diameter of the dimple 156 so that the dimple 156 can be inserted. It has a circular concave shape. In this conventional belt block 142, for example, when the succeeding belt block 142 is displaced in the right direction in the belt width direction (the preceding belt block 142 is shifted in the left direction in the belt width direction), the dimple 156 is moved to the right in the hole 158. The position is shifted by ΔX in the direction. At that time, the position where the clearance L in the Y direction between the inner peripheral upper surface portion 158A of the hole 158 and the outer peripheral upper surface portion 156A of the dimple 156 is minimum is a position shifted to the right by ΔSo from the center of the hole 158. .

  On the other hand, as shown in FIG. 4B, in the belt block 42 of the present embodiment, for example, the succeeding belt block 42 is positioned rightward in the belt width direction (the preceding belt block 42 is positioned leftward in the belt width direction). When shifted, the dimple 56 is displaced in the hole 58 by ΔX in the right direction. At this time, the position where the clearance L in the Y direction between the inner peripheral upper surface portion 58A of the hole 58 and the outer peripheral upper surface portion 56A of the dimple 56 is minimized is ΔSn (ΔSn <ΔSo) from the center of the hole 58 to the right. The position is shifted, and the amount of displacement is reduced as compared with the prior art.

  FIG. 5 shows the amount of displacement ΔX of the relative position of the dimples 56, 156 relative to the holes 58, 158 in the belt width direction (X direction) and the inside of the holes 58, 158 when the preceding belt blocks 42, 142 are tilted backward. Centers of the holes 58 and 158 at positions where the outer peripheral upper surface portions 56A and 156A of the dimples 56 and 156 in the belt blocks 42 and 142 on the subsequent side contact the peripheral upper surface portions 58A and 158A (positions where the clearance L in the Y direction is minimized). 5 is a graph showing the relationship with the positional deviation amount ΔS from the angle. In this graph, the conventional dimple 156 and the hole 158 are indicated by a dotted line O, and the dimple 56 and the hole 58 of the present embodiment are indicated by a one-dot chain line N1.

  As can be seen from this graph, in the conventional dimple 156 and the hole 158, the amount of deviation in which the dimple 156 of the succeeding belt block 142 shifts in the belt width direction (X direction) with respect to the hole 158 of the preceding belt block 142. Even if ΔX is slight, when the leading belt block 142 is tilted backward, the position where the dimple 156 of the trailing belt block 142 contacts the hole 158 (the position where the clearance L in the Y direction is minimized) is The center of the hole 158 is greatly displaced.

  On the other hand, in the dimple 56 and the hole 58 of the present embodiment, even if the dimple 56 of the succeeding belt block 42 is displaced in the belt width direction (X direction) with respect to the hole 58 of the preceding belt block 42, The position where the dimple 56 of the succeeding belt block 42 contacts the hole 58 when the leading belt block 42 is tilted backward (the position where the clearance L in the Y direction is minimum) is excessive from the center of the hole 58. There is no deviation.

  As described above, when the dimple 56 and the hole 58 shown in the present embodiment are used, when the rear belt block 42 is inclined backward due to the deterioration of the pitching posture shown by the arrow A in FIG. Even if there is a relative position error in the belt width direction (X direction) between 58 and the dimple 56 on the subsequent side, the outer peripheral upper surface portion 56A of the dimple 56 first contacts the inner peripheral upper surface portion 58A of the hole 58 ( Since the positional deviation amount ΔS from the center of the hole 58 at the position where the clearance L in the Y direction is the minimum) can be suppressed, deterioration of the yawing posture shown by the arrow B in FIG. 2 can be improved.

  That is, an eccentric action of the load that causes the yawing posture to deteriorate (the load action point of the belt block 42 bitten between the pair of variable pulleys 20 and 30 is biased from the center of the hole 58 to one of the belt width directions). Therefore, the transmission belt 40 can be wound in a correct posture between the pair of variable pulleys 20 and 30, and the reduction in the belt power transmission torque capacity and the transmission efficiency can be suppressed. Can do. Therefore, it is possible to increase the torque capacity of the belt power transmission and increase the transmission efficiency.

  Next, another embodiment of the dimple 56 and the hole 58 will be described. In the shape shown in FIG. 6A, the shape of the hole 58 is the above substantially asteroid shape, the shape of the dimple 56 is a planar shape in which each side is a straight line when viewed from the front, and each corner is in the radial direction. The shape is a convex curved surface formed of an arc that is convex outward, and has a substantially square shape that is formed such that each side and each corner is smoothly continuous. In the shape shown in FIG. 6B, the shape of the hole 58 is substantially square, and the shape of the dimple 56 is cylindrical (circular shape in front view).

  Further, the shape shown in FIG. 7A is a convex curved surface shape made of an arc in which each side is convex inward in the radial direction (center side of the hole 58) in the front view, as shown in FIG. Each corner has a convex curved surface shape that is formed in a radially convex shape (an arc having a larger curvature than each side), and each side and each corner are formed smoothly and continuously. The dimple 56 has a cylindrical shape (circular shape in front view).

  The shape shown in FIG. 7B is such that the shape of the hole 58 is the above regular triangle shape, the shape of the dimple 56 is a planar shape in which each side is a straight line when viewed from the front, and each corner portion is A substantially equilateral triangular shape (a substantially equilateral triangular shape different from the hole 58), which is formed as a convex curved surface formed of an arc that is convex outward in the radial direction, and each side and each corner portion are smoothly continuous. ).

  In the dimple 56 and the hole 58 having these shapes, the relative position shift amount ΔX of the dimple 56 with respect to the hole 58 in the belt width direction (X direction) and the backward inclination of the belt block 42 on the preceding side are detected. The position deviation amount ΔS from the center of the hole 58 at the position where the outer peripheral upper surface portion 56A of the dimple 56 in the belt block 42 on the subsequent side contacts the inner peripheral upper surface portion 58A of the 58 (position where the clearance L in the Y direction is minimized). This relationship is further shown in the graph of FIG. That is, for example, the shape shown in FIG. 6A is indicated by a solid line N2, and the shape shown in FIG. 6B is indicated by a two-dot chain line N3.

  As can be seen from this graph, in the shape shown in FIG. 6A, the dimple 56 of the succeeding belt block 42 contacts the hole 58 when the leading belt block 42 is tilted backward (Y The position where the clearance L in the direction is the smallest) is always the apex position of the convex curved surface shape (convex arc) of the hole 58, and therefore does not deviate from the center of the hole 58.

  Further, in the shape shown in FIG. 6B, when the leading belt block 42 is tilted backward, the position where the dimple 56 of the trailing belt block 42 contacts the hole 58 (the clearance L in the Y direction is Since the minimum position) is always the apex position of the arc of the dimple 56, it is shifted by the same amount as the shift amount ΔX of the relative position between the dimple 56 and the hole 58. That is, it shifts only slightly.

  As described above, when the dimple 56 and the hole 58 are formed in the shapes shown in the above embodiments, when the preceding belt block 42 is tilted backward, the hole 58 of the preceding belt block 42 and the succeeding belt block 42 follow. Even if there is a relative displacement in the belt width direction between the dimples 56 of the belt block 42, the position where the outer peripheral upper surface portion 56A of the dimple 56 and the inner peripheral upper surface portion 58A of the hole 58 first contact ( The position where the clearance L in the Y direction is minimized) does not move in the belt width direction from the center of the hole 58, or moves only slightly.

  Therefore, the eccentric action of the load that causes the yawing posture to deteriorate can be suppressed, and the transmission belt 40 can be wound around the pair of variable pulleys 20 and 30 in the correct posture. Accordingly, it is possible to suppress a decrease in the torque capacity of the belt power transmission and a decrease in the transmission efficiency, and it is possible to realize an increase in the torque capacity of the belt power transmission and an increase in the transmission efficiency. Incidentally, the shape shown in FIG. 4 has characteristics almost in the middle of the shape shown in FIG. 6A and the shape shown in FIG.

  Note that the case where the belt blocks 42 adjacent to each other in the front and rear are relatively displaced in the belt width direction (X direction) includes a case where the rolling posture indicated by the arrow C in FIG. 2 deteriorates. Further, when the dimple 56 and the hole 58 of the adjacent belt block 42 are displaced relative to each other in the belt width direction (X direction), the position where the clearance L in the Y direction is minimized is defined as the belt width direction (X direction). ) (A shape in which the minimum value of the clearance L is substantially the same as the minimum value of the clearance L when the clearance L is not displaced in the belt width direction) is limited to the shapes shown in the above drawings. It is not a thing.

  That is, in each of the above-described embodiments, the shape of the hole 58 is substantially an asteroid shape or the like, but the shape of the hole 58 is convex on the inner side in the radial direction (center side of the hole 58) when viewed from the front. As long as the shape is a convex curved surface formed of a circular arc, another multi-sided shape may be used, and the shape of the corresponding dimple 56 is also a polygonal shape or a circular shape having the same number of angles different from the hole 58 in a front view. And it is sufficient. In other words, the dimples 56 and the holes 58 may have different shapes from each other, and may be a combination of a convex curved surface shape and a planar shape, or a combination of convex curved surface shapes having different curvatures. The inner peripheral upper surface portion 58A and the outer peripheral upper surface portion 56A of the dimple 56 only need to have the above-described shape.

  Further, when the shape error of the head portion 50 of the belt block 42 (difference between right and left plate thickness, torsion, etc.) is large, when the preceding belt block 42 is tilted backward, the following belt block is inserted into the hole 58. Before the 42 dimples 56 contact, the head 50 of the preceding belt block 42 may come into contact with the head 50 of the preceding belt block 42. However, in this case as well, the shape tolerance of the head 50 of the belt block 42 is set appropriately, and in combination with this embodiment, the eccentric action of the load that causes the yawing posture to deteriorate can be suppressed. .

Schematic front view showing a configuration of a pair of variable pulleys in a CVT for a vehicle Schematic perspective view showing the configuration of an endless belt for power transmission wound between a pair of variable pulleys (A) Schematic front view of belt block, (B) Schematic side view of belt block (A) Explanatory diagram showing the relationship between the conventional dimple and hole shape and clearance, (B) Explanatory diagram showing the relationship between the dimple, hole shape and clearance of this embodiment A graph showing the relationship between the amount of deviation ΔX of the relative position of the dimple relative to the hole in the belt width direction and the amount of deviation ΔS of the dimple contact position contacting the hole from the hole center Schematic front view showing shapes of dimples and holes of another embodiment Schematic front view showing shapes of dimples and holes of another embodiment

Explanation of symbols

10 CVT (Belt-type continuously variable transmission)
DESCRIPTION OF SYMBOLS 12 Input shaft 14 Output shaft 20 Input side variable pulley 22 Fixed sheave 24 Movable sheave 26 Belt sliding surface 28 V groove 30 Output side variable pulley 32 Fixed sheave 34 Movable sheave 36 Belt sliding surface 38 V groove 40 Power transmission belt (power transmission) For endless belt)
42 Belt block (element)
44 engaging groove 46 hoop (band-like member)
48 Notch 50 Head 52 Main body 54 Neck 56 Dimple (convex)
58 holes (concave)

Claims (3)

A convex portion is formed on one surface, a concave portion is formed on the other surface, and a plurality of elements arranged in parallel with each other so that the convex portion can be inserted into the concave portion are supported. An endless belt for power transmission that is wound between a pair of variable pulleys.
The shape of the concave portion and the convex portion is such that the concave portion and the convex portion in a direction orthogonal to both the belt traveling direction and the belt width direction even when one of the adjacent elements is displaced relative to the belt width direction. An endless belt for power transmission, wherein a minimum value of the clearance is substantially the same value as the minimum value of the clearance when the position does not shift. A convex portion is formed on one surface, a concave portion is formed on the other surface, and a plurality of elements arranged in parallel with each other so that the convex portion can be inserted into the concave portion are supported. An endless belt for power transmission that is wound between a pair of variable pulleys.
When the element tilts backward with respect to the belt traveling direction, the surface of the concave portion that contacts the convex portion and the surface of the convex portion that contacts the concave portion are both convex curved surfaces. Endless belt for power transmission. A convex portion is formed on one surface, a concave portion is formed on the other surface, and a plurality of elements arranged in parallel with each other so that the convex portion can be inserted into the concave portion are supported. An endless belt for power transmission that is wound between a pair of variable pulleys.
When the element tilts backward with respect to the belt traveling direction, one of the surface that contacts the convex portion of the concave portion and the surface that contacts the concave portion of the convex portion is a convex curved surface shape, An endless belt for power transmission, wherein the other surface has a planar shape.

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