JP2015161381A - Belt for stepless speed change device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt for a stepless speed change device in which noise generated between contact among a plurality of elements engaged with an endless ring, an input pulley and an output pulley is reduced.SOLUTION: A plurality of elements 30a engaged with an endless ring are constituted by a group composed of the first elements 30aA having a main surface 30a1 in which a thickness in a circumferential direction Dc is reduced on the basis of the first characteristic near a part where it approaches more a pulley abutment surface 30a3 than a central position Dw1 in a width direction Dw and a rear surface 30a2 formed equally over a width direction, and a group composed of the second elements 30aB having a main surface 30a1 in which a thickness in a circumferential direction is equally formed over a width direction and a rear surface 30a2 reduced near a part where it approaches more a pulley abutment surface 30a3 than the central position in a width direction on the basis of the second characteristic different from the first characteristic, and at the same time the first and second elements 30aA and 30aB are merged and arranged in a circumferential direction.

Description

  The present invention relates to a belt of a continuously variable transmission, and more particularly to a structure of an element constituting the belt.

  As a belt of a continuously variable transmission, a technique described in Patent Document 1 below is known. In the technique described in Patent Document 1, two or more types of elements having a circumferential thickness are randomly mixed as elements constituting the belt of a continuously variable transmission wound around an input / output pulley. Further, it is configured to reduce the audible noise by dispersing the frequency peaks of the noise generated by the contact with the output pulley.

JP-A 64-55447

  As described above, the technique described in Patent Document 1 is configured to reduce noise by randomly mixing two or more circumferential thicknesses. The object of the present invention is also consistent with the object of Patent Document 1, and is a continuously variable transmission that reduces noise generated by contact between a plurality of elements engaged with an endless ring and an input and output pulley. Is to provide a belt for the machine.

  In order to achieve the above object, in claim 1, a belt of a continuously variable transmission comprising a plurality of elements engaged with an endless ring and wound around an input pulley and an output pulley, A plate having a substantially trapezoidal shape in plan view, in which each of the plurality of elements has a main surface on which a locking edge is formed, a back surface of the main surface, and pulley contact surfaces on both sides of the main surface and the back surface in the width direction. A continuously variable transmission that continuously shifts the rotational driving force input from the input pulley and outputs it from the output pulley while pushing the back surface of the main surface through the locking edge in the circumferential direction of the endless belt. In the machine belt, the plurality of elements may be reduced based on the first characteristic in the vicinity where the circumferential thickness is closer to the pulley contact surface than the central position in the width direction. A group of first elements having a main surface and a back surface formed uniformly over the width direction, a main surface with a thickness in the circumferential direction formed uniformly over the width direction, and a central position in the width direction And a group of second elements having a back surface that is reduced based on a second characteristic different from the first characteristic near the pulley contact surface. And the second element are arranged so as to be mixed at least locally in the circumferential direction.

  In the continuously variable transmission belt according to claim 2, the first characteristic of the main surface of the first element is that the thickness in the circumferential direction is maximized at a center position in the width direction, and The second characteristic of the back surface of the second element is set to a predetermined value including a center position in the width direction. It is configured so as to be the maximum in the range and to be reduced only at both end portions close to the pulley contact surface.

  In the continuously variable transmission belt according to claim 3, the first characteristic of the main surface of the first element is a curve, and the second characteristic of the back surface of the second element is a straight line. It was configured as follows.

  In the continuously variable transmission belt according to a fourth aspect, the first element and the second element are configured such that the maximum value of the thickness in the circumferential direction is set equal.

  In the continuously variable transmission belt according to claim 1, the plurality of elements are based on the first characteristic in the vicinity where the thickness in the circumferential direction is closer to the pulley contact surface than the center position in the width direction. A group consisting of a first element having a main surface to be reduced and a back surface formed uniformly over the width direction, a main surface with a circumferential thickness formed uniformly over the width direction, and a center position in the width direction. The first element and the second element are formed of a group of second elements having a back surface that is reduced based on a second characteristic different from the first characteristic in the vicinity of the pulley contact surface. At least locally mixed and arranged in the circumferential direction. The frequency of noise generated by contact between the element and the input and output pulleys can be dispersed, so that the belt noise can be reduced as in the technique described in Patent Document 1. Can be reduced.

  That is, the first element having the main surface that is reduced based on the first characteristic in the vicinity of the pulley contact surface in the vicinity of the pulley contact surface and the back surface that is formed uniformly in the width direction is formed uniformly. And a second element having a back surface reduced on the basis of the second characteristic in the vicinity of the main contact surface and the pulley contact surface is arranged so as to be at least locally mixed in the circumferential direction. Therefore, at least at the portion where the elements are mixed locally, the pitch of the elements (interval between two adjacent elements) is randomized when the input and output pulleys are brought into contact with each other and when they are separated from each other. In other words, the timing at which the element enters and exits and the output pulley contacts and leaves can be randomized. As a result, the frequency peak of the generated noise can be dispersed, and the belt noise can be reduced.

  In addition, when the element abuts against the pulley in the region where there is no pushing force between the elements on the input pulley side, it becomes possible to perform a yawing motion around the radial axis of the endless belt, thereby making the pitch more random, A minute impact sound when contacting the pulley can also be reduced.

  Furthermore, the pitch when the elements are separated from the pulley in a region where there is no pushing force between the elements on the output pulley side can be made more random, and the minute scratching (scratching) sound when the elements are separated from the pulley can be reduced.

  In the continuously variable transmission belt according to claim 2, the first characteristic of the main surface of the first element is that the thickness in the circumferential direction is maximized at the center position in the width direction, and the pulley contact surface The second characteristic of the back surface of the second element is maximized in a predetermined range including the center position in the width direction, and the second characteristic of the back surface of the second element is maximized. Since it is configured to be set to decrease only at both ends close to the pulley contact surface, in addition to the above-described effects, the above-described noise reduction effect can be realized by a relatively easy element manufacturing method. That is, the main surface of the first element with a high degree of machining freedom is shaped into an arc in the entire region, and the back surface of the second element with a low degree of machining freedom is shaped into a substantially straight line, and only the ends are slightly crushed. Therefore, a noise reduction effect can be realized by a relatively easy manufacturing method.

  In the continuously variable transmission belt according to claim 3, the first characteristic of the main surface of the first element is a curve, and the second characteristic of the back surface of the second element is a straight line. Therefore, in addition to the effects described above, it is possible to more reliably and easily realize randomization of the pitch when the element enters and contacts the output pulley and when the element leaves the pulley.

  In the continuously variable transmission belt according to claim 4, since the first element and the second element are configured such that the maximum value of the thickness in the circumferential direction is set equal, in addition to the effects described above, As in the technique described in Patent Document 1, it is possible to avoid complicated manufacturing process management and increase in cost due to the necessity to prepare two or more types of element materials having different maximum thickness values.

1 is a cross-sectional view of a continuously variable transmission including a continuously variable transmission belt according to an embodiment of the present invention. It is a front view of the element of the belt for continuously variable transmission shown in FIG. FIG. 3 is a rear view of the element shown in FIG. 2. FIG. 4 is a side view of a pulley contact surface of the element shown in FIGS. 2 and 3. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2, showing two types of configurations with different thicknesses for the element shown in FIG. 2. It is explanatory drawing which shows the pitch of an element when the two types of elements shown in FIG. 5 are mixed and arranged in the circumferential direction of the belt. It is explanatory drawing explaining the generation | occurrence | production mechanism of the noise between a belt and a pulley in the continuously variable transmission shown in FIG. FIG. 7 is an explanatory view showing the pitch of elements in a modification of the two types of elements shown in FIG. 5, similarly to FIG. 6. It is explanatory drawing which shows the pitch of an element similarly to FIG. 6 about another modification of 2 types of elements shown in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment for implementing a continuously variable transmission belt according to the invention will be described with reference to the accompanying drawings.

1 is a sectional view of a continuously variable transmission including a continuously variable transmission belt according to this embodiment, FIG. 2 is a front view of elements of the continuously variable transmission belt shown in FIG. 1, and FIG. 3 is illustrated in FIG. 4 is a rear view of the element, FIG. 4 is a side view of the pulley contact surface of the element shown in FIG. 2 and FIG. 3, and FIG. 5 is a diagram of two types of configurations with different thicknesses of the element shown in FIG. Sectional view, FIG. 6 shows 2 in FIG.
It is explanatory drawing which shows the pitch of an element when a seed element is mixed and arranged in the circumferential direction of a belt.

  In FIG. 1, reference numeral 10 denotes a belt-type continuously variable transmission. The continuously variable transmission 10 is mounted on a vehicle (not shown), shifts the rotation of a drive source 12 such as an engine, and transmits it to left and right drive wheels (not shown).

  The continuously variable transmission 10 includes an input shaft 14, an output shaft 16, and an intermediate shaft 20 that are provided in parallel with each other, and the output of the drive source 12 is input from the input shaft 14 via a torque converter 22.

  The continuously variable transmission 10 includes an input pulley (drive pulley) 24 disposed on the input shaft 14, an output pulley (driven pulley) 26 disposed on the output shaft 16, and a metal belt ( An endless belt (continuously variable transmission belt) 30. The input pulley 24 and the output pulley 26 are each composed of two disks (sheaves) arranged to face each other.

  The input pulley 24 is fixed to the input shaft 14 so that it cannot rotate relative to the input shaft 14 and cannot move in the axial direction. The input pulley 24 cannot move relative to the input shaft 14 and moves relative to the fixed input pulley half 24a in the axial direction. The movable input pulley half 24b is freely provided.

  The output pulley 26 is also fixed to the output shaft 16 so that it cannot rotate relative to the output shaft 16 and cannot move in the axial direction. The output pulley 26 cannot move relative to the output shaft 16 and cannot rotate relative to the output shaft 16 in the axial direction relative to the fixed output pulley half 26a. The movable output pulley half 26b is movably provided.

  The movable-side input pulley half 24b and the movable-side output pulley half 26b are provided with piston chambers 24b1, 26b1, and the movable-side pulley halves 24b, 26b are pressures of hydraulic oil (hydraulic pressure) supplied to the piston chambers 24b1, 26b1. ) Approaches or moves away from the fixed-side input pulley half 24a and the fixed-side output pulley half 26a.

  A belt 30 is wound between the input pulley 24 and the output pulley 26. The belt 30 includes a large number of elements 30a (a plurality of elements), and two endless rings 30b fitted on both sides thereof.

  Each of the plurality of elements 30a includes a main surface 30a1 on which a locking edge 30a11 is formed, a back surface 30a2 on the back side of the main surface 30a1, and pulleys on both sides in the width direction Dw (shown in FIG. 5) of the main surface 30a1 and the back surface 30a2. It consists of a plate provided with a substantially trapezoidal portion 30a4 in plan view (front) having a contact surface (side surface or V-shaped surface) 30a3.

  As shown in FIG. 1, in the element 30a, a saddle portion 30a5 is formed on the upper portion of the trapezoidal portion 30a4, and two endless rings 30b are inserted from both sides, so that the element 30a is connected to the endless ring via the saddle portion 30a5. 30b is configured to be engaged with 30b. Each of the two endless rings 30b is formed by laminating a plurality of thin steel plates.

  The upper part of the saddle portion 30a5 of the element 30a protrudes on both sides, and a nose (projection) 30a6 projects from the center position on the main surface side, while a recess 30a7 is drilled at a corresponding position on the back surface side, and thus the nose 30a6. Are inserted into the recess 30a7 of the adjacent element 30a and aligned.

  Further, the element 30a is configured to be pitchable in the circumferential direction Dc (shown in FIG. 5) of the belt 30 with the locking edge 30a11 as a fulcrum, and thus the element 30a is formed on the main surface 30a1 via the locking edge 30a11 in the circumferential direction Dc. The rotary drive force of the drive source 12 input from the input pulley 24 is transmitted from the output pulley 26 while pushing the back surface 30a2 (of an adjacent element).

  That is, the continuously variable transmission 10 is input in a state where the pulley contact surfaces 30a3 of the plurality of elements 30a of the belt 30 are in contact with the pulley surfaces of the input pulley 24 and the output pulley 26 and are strongly clamped (pressed) from both sides. The rotational driving force of the driving source 12 input from the pulley 24 is steplessly changed and output from the output pulley 26.

  Before continuing the description of the element 30a of the belt 30 according to this embodiment, the noise generation mechanism between the belt 30 and the input and output pulleys 24 and 26 in the continuously variable transmission 10 shown in FIG. 1 with reference to FIG. Will be explained.

  As shown in FIG. 5A, the element 30a is separated from the input pulley 24 at the position (time point) 1, is brought into contact with the output pulley 26 at the position 2, and is then separated from the output pulley 26 at the position 3. 4 operates so as to come into contact with the input pulley 24 and bite. The pressing force between the elements 30a is generated only between the positions 1 and 2.

  Noise is generated due to vibration at a position 1 where the elements 30a are separated from the input pulley 24, a position 2 where the elements 30a are engaged with the output pulley 26, a position 3 where the elements 30a are separated from the output pulley 26, and a position 4 where the elements 30a are engaged with the input pulley 24. Since the input of the step transmission 10, the input carrying the output pulleys 24 and 26, and the output shafts 14 and 16 have no element to attenuate the vibration, the generated vibration is resonated (amplified).

  More specifically, when the element 30 a leaves the pulleys 24 and 26 at the positions 1 and 3, the element 30 a rubs the pulleys 24 and 26, so that a scratch sound (scratching noise) is generated, and at the positions 2 and 4. When engaging with the pulleys 24 and 26, a hitting sound is generated when the element 30a hits the pulleys 24 and 26, and a metallic impact sound is generated by resonating with the natural frequency of the output shafts 14 and 16.

  Therefore, in this embodiment, as well shown in FIG. 5, the plurality of elements 30a are located in the vicinity where the thickness in the circumferential direction Dc is closer to the pulley contact surface 30a3 than the center position Dw1 in the width direction Dw ( A group consisting of a first element 30aA having a main surface 30a1 reduced based on the first characteristic (consisting of a curve) and a back surface 30a2 formed uniformly over the width direction Dw, and the thickness in the circumferential direction Dc is the width direction Based on a second characteristic different from the first characteristic (consisting of a straight line) at both end portions 30a21 closer to the pulley contact surface 30a3 than the main surface 30a1 formed uniformly over Dw and the center position Dw1 in the width direction Dw And a group of second elements 30aB having a reduced back surface 30a2 and, as well shown in FIG. Was constructed as comprising forced positioned at least locally mixed in cement 30aA and the second element 30aB the circumferential direction Dc.

  The first characteristic of the main surface 30a1 of the first element 30aA is that the thickness in the circumferential direction Dc is maximized at the center position Dw1 in the width direction Dw, and gradually increases toward the vicinity of the pulley contact surface 30a3. The second characteristic of the back surface 30a2 of the second element 30aB is a predetermined range in which the thickness in the circumferential direction Dc includes the center position Dw1 in the width direction Dw, more specifically, excluding both end portions 30a21. It is set so as to be maximized (evenly) in most of the region in the width direction Dw and to decrease only at both end portions 30a21 close to the pulley contact surface 30a3.

  Further, the first element 30aA and the second element 30aB are configured such that the maximum thickness value tm in the circumferential direction Dc is set equal at the center position Dw1 in the width direction Dw.

  In this embodiment, since it is configured as described above, it is possible to randomize the contact time between the element 30a and the output pulleys 24 and 26 in the region where the elements 30aA and 30aB are mixed and arranged at least locally. Thus, the frequency peaks of the generated noise can be dispersed, and hence the noise of the belt 30 can be reduced.

  That is, a first surface having a main surface 30a1 that is reduced based on a first characteristic that is a curve in the vicinity of the pulley contact surface 30a3 in the vicinity of the pulley contact surface 30a3 and a back surface 30a2 that is formed uniformly in the width direction Dw. Second element 30aB having one element 30aA and a back surface 30a2 that is reduced on the basis of a second characteristic formed by a straight line at both end portions 30a21 adjacent to pulley contact surface 30a3 and main surface 30a1 that is formed uniformly. Are arranged so as to be at least locally mixed and arranged in the circumferential direction Dc. Therefore, as shown in FIGS. 6 (a) and 6 (b), at least the pitch of the elements 30a (adjacent to each other) The distance between the two elements 30a) when the input and output pulleys 24 and 26 come into contact with each other and when they leave. In, i.e., it is possible to disperse the peak frequency of the noise generated by it is possible to randomly the inlet side of the pitch and the outlet side of the pitch, thereby reducing the noise of the belt 30.

  Further, when the element 30a abuts the input pulley 24 in a region where there is no pressing force between the elements 30a on the input pulley 24 side, arrows around the radial axis of the belt 30 (arrows at positions 3 and 4 in FIG. 6A) Yaw movement (indicated by Y) is also possible, thereby making the pitch more random, and also reducing the impact sound when the element 30a contacts the input and output pulleys 24, 26, thereby reducing noise. It can be further reduced.

  Furthermore, the pitch when the element 30a is separated from the output pulley 26 in a region where there is no pushing force between the elements 30a on the output pulley 26 side can be made more random, and a minute scratch (scratch) sound when the element 30a is separated from the output pulley 26 is also generated. Can be reduced.

  In addition, since the second element 30aB is configured to have the back surface 30a2 that is reduced based on the second characteristic that is a straight line at both end portions 30a21 adjacent to the pulley contact surface 30a3, the input and output pulleys 24, As well as being in contact with H. 26, the timing when moving away from them can be made more random, and the generation timing of the scratch sound can also be made random to further reduce the noise.

  Further, since the first characteristic of the main surface 30a1 of the first element 30aA is a curve and the second characteristic of the back surface 30a2 of the second element 30aB is a straight line, the noise reduction effect described above is compared. It can be realized by an easy element manufacturing method. That is, the main surface 30a1 having a high degree of processing freedom of the first element 30aA is shaped into an arc in the entire region, and the back surface 30a2 having a low degree of processing freedom of the second element 30aB is shaped into a substantially straight line, while only the both end portions 30a21. Since a slight crushing process is sufficient, a noise reduction effect can be realized by a relatively easy manufacturing method.

  That is, the main surface 30a1 side of the first element 30aA is formed with a tapered surface below the locking edge 30a11. Is expensive. On the other hand, since there is no taper portion on the back surface 30a2 side of the second element 30aB, there is no movement destination of the meat when processed, so the degree of freedom in processing is low. Therefore, the back surface 30a2 of the second element 30aB can be easily manufactured by processing only both end portions 30a21.

  In addition, the first element 30aA and the second element 30aB are configured such that the maximum thickness value tm in the circumferential direction Dc is set to be equal at the center position Dw1 in the width direction Dw. As described above, it is necessary to prepare two or more types of materials with different maximum thicknesses as the material of the element 30a, so that the manufacturing process management becomes complicated (in addition to material manufacturing, inspection, separate installation of manufacturing lines, etc.) and cost An increase can be avoided.

  FIG. 8 is an explanatory diagram showing the pitch of the elements in the same manner as in FIG. 6 for a modification of the two types of elements shown in FIG.

  In this modification, as shown in FIG. 8A, the first element 30aA has the same structure as the above-described embodiment, and the second element 30aB is basically the same as the first element 30aA. Although it has a structure, it has a shape in which the thickness in the circumferential direction of the main surface is gently reduced near both ends as compared with the first element 30aA.

  As a result, as shown in FIG. 4B, the randomness at the positions 2 and 4 could be ensured in the same manner as in the example. In addition, as shown to the same figure (a), the yawing motion also has arisen and the noise is also reduced by this.

  FIG. 9 is an explanatory view showing the pitch of elements in the same manner as FIG. 6 for another modification of the two types of elements shown in FIG.

  In this modification, as shown in FIG. 9, the first element 30aA has the same structure as the above-described embodiment, while the second element has a rectangular shape. The effect is almost the same as in the first modification.

  In this embodiment, the first characteristic is constituted by a curve and the second characteristic is constituted by a straight line. However, whether a curve or a straight line is related to an allowable error in manufacturing the element. In this embodiment, “curve” and “straight line” mean a curve and a straight line within a normal allowable error range.

  As described above, in this embodiment, the belt 30 of the continuously variable transmission includes a plurality of elements 30a engaged with the endless ring 30b and is wound around the input pulley 24 and the output pulley 26. The plurality of elements 30a each have a main surface 30a1 on which a locking edge 30a11 is formed, a back surface 30a2 of the main surface, and pulley contact surfaces 30a3 on both sides of the main surface 30a1 and the back surface 30a2 in the width direction Dw. The plate is generally provided with a trapezoidal portion 30a4, and is input from the input pulley 24 while pushing the back surface 30a2 with the main surface 30a1 via the locking edge 30a11 in the circumferential direction Dc of the endless belt 30 (drive source 12 A belt 30 for a continuously variable transmission that continuously changes the rotational driving force and outputs it from the output pulley 26; The main surface 30a1 in which the thickness of the plurality of elements 30a is reduced based on the first characteristic in the vicinity of the pulley contact surface 30a3 closer to the thickness D in the circumferential direction Dc than in the central position Dw1 in the width direction Dw. And a group of first elements 30aA having a back surface 30a2 formed uniformly over the width direction Dw, and a main surface 30a1 and a width direction in which the thickness in the circumferential direction Dc is formed uniformly over the width direction Dw From a group of second elements 30aB having a back surface 30a2 that is reduced based on a second characteristic different from the first characteristic in the vicinity of the pulley contact surface 30a3 closer to the pulley contact surface 30a3 than the center position Dw1 of Dw And the first element 30aA and the second element 30aB are arranged in the circumferential direction Dc. Since it is configured so that it is arranged at least locally mixed, it is possible to randomize the contact time between the element 30a and the output pulleys 24 and 26 at least at the part where the elements are mixed and arranged locally. Thus, it is possible to disperse the peak of the frequency of the noise generated by the contact between the element 30a and the input and output pulleys 24 and 26, and thus the noise of the belt 30 can be reduced as in the technique described in Patent Document 1.

  In other words, the first element having the main surface 30a1 whose thickness in the circumferential direction Dc is reduced based on the first characteristic in the vicinity of the pulley contact surface 30a3 and the back surface 30a2 formed uniformly over the width direction Dw. A second element 30aB having a main surface 30a1 that is uniformly formed and a back surface 30a2 that is reduced based on the second characteristic in the vicinity of the pulley contact surface 30a3 and at least locally in the circumferential direction Dc. Therefore, the pitch of the elements 30a (interval between two adjacent elements 30a) is set to the input / output pulley 24 at least at the portion where the elements are mixed and arranged locally. , 26 can be randomized when they come into contact with each other and when they leave, in other words, DOO 30a and input, the timing at which the output pulley 24, 26 away from the timing mutually contacted can be random. As a result, the frequency peaks of the generated noise can be dispersed, and the noise of the belt 30 can be reduced.

  Further, when the element 30a abuts on the input pulley 24 in a region where there is no pressing force between the elements on the input pulley 24 side, it is possible to perform a yawing motion around the radial axis of the belt 30, thereby making the pitch more random. In addition, it is possible to reduce a minute impact sound when contacting the input pulley 24.

  Further, the pitch when the element 30a is separated from the output pulley 26 in a region where there is no pushing force between the elements on the output pulley 26 side can be made more random, and the minute scratching (scratching) sound when the element 30a is separated from the output pulley 26 is also reduced. Can be made.

  Further, the first characteristic of the main surface 30a1 of the first element 30aA is that the thickness in the circumferential direction Dc is maximized at the center position Dw1 in the width direction Dw and is close to the pulley contact surface 30a3. The second characteristic of the back surface 30a2 of the second element 30aB is a maximum in a predetermined range in which the thickness in the circumferential direction Dc includes the center position Dw1 in the width direction Dw. In addition to the above-described effects, the noise reduction effect described above can be achieved with a relatively easy element manufacturing method because it is configured to be reduced only at both end portions 30a21 close to the pulley contact surface 30a3. Can be realized.

  That is, the main surface 30a1 having a high degree of processing freedom of the first element 30aA is shaped into an arc in the entire region, and the back surface 30a2 having a low degree of processing freedom of the second element 30aB is shaped into a substantially straight line, while only the both end portions 30a21. Since a slight crushing process is sufficient, a noise reduction effect can be realized by a relatively easy manufacturing method.

  In other words, the main surface 30a1 side of the first element 30aA is formed with a tapered surface below the locking edge 30a11. Is expensive. On the other hand, since there is no taper portion on the back surface 30a2 side of the second element 30aB, there is no movement destination of the meat when processed, so the degree of freedom in processing is low. Therefore, the back surface 30a2 of the second element 30aB can be easily manufactured by processing only both end portions 30a21.

  Further, since the first characteristic of the main surface 30a1 of the first element 30aA is a curve and the second characteristic of the back surface 30a2 of the second element 30aB is a straight line, in addition to the effects described above, The randomization of the pitch when the element 30a enters and contacts the output pulleys 24 and 26 and away from them can be realized more reliably and easily.

  Further, in the continuously variable transmission belt 30, the first element 30aA and the second element 30aB are configured so that the maximum thickness tm in the circumferential direction Dc is set equal. In addition to the effects, avoiding complicated manufacturing process management and increased costs due to the necessity to prepare two or more types of materials having different maximum thickness values as the material of the element 30a as in the technique described in Patent Document 1. Can do.

  In the above example, the first characteristic is a curve and the second characteristic is a straight line. However, the present invention is not limited to this. The first and second characteristics may be any as long as they are different from each other. For example, both may be a combination of a curve and a straight line.

10 continuously variable transmission, 12 drive source, 14 input shaft, 16 output shaft, 20 intermediate shaft, 22 torque converter, 24 input pulley, 24a stationary input pulley half, 24b movable input pulley half, 26 output pulley, 26a Fixed output pulley half, 26b Movable output pulley half, 30 belt, 30a element, 30a1 main surface, 30a11 locking edge, 30a2 back surface, 30a21 both ends, 30a3 pulley contact surface, 30a4 trapezoidal part, 30a5 saddle Part, 30a6 nose, 30a7 recess

Claims (4)

  A belt of a continuously variable transmission comprising a plurality of elements engaged with an endless ring and wound around an input pulley and an output pulley, wherein the plurality of elements each have a main surface on which a locking edge is formed, The plate comprises a plate having a substantially trapezoidal shape in plan view having a back surface of the main surface and pulley contact surfaces on both sides of the main surface and the width direction of the back surface, and the circumferential direction of the endless belt via the locking edge In the continuously variable transmission belt that continuously changes the rotational driving force input from the input pulley and outputs the output from the output pulley while pushing the back surface on the main surface, the plurality of elements have the circumferential thickness. Is less than the central position in the width direction and is closer to the pulley contact surface than the main surface that is reduced based on the first characteristic and the back that is uniformly formed in the width direction. A main surface having a thickness in the circumferential direction that is uniformly formed over the width direction, and a position closer to the pulley contact surface than a center position in the width direction. A group of second elements having a back surface that is reduced based on a second characteristic different from the first characteristic, and wherein the first element and the second element are at least locally mixed in the circumferential direction A belt for a continuously variable transmission, wherein the belt is continuously arranged.   The first characteristic of the main surface of the first element is that the thickness in the circumferential direction is maximized at the center position in the width direction and gradually decreases toward the vicinity of the pulley contact surface. And the second characteristic of the back surface of the second element is such that the thickness in the circumferential direction is maximum within a predetermined range including the center position in the width direction, and both ends close to the pulley contact surface The continuously variable transmission belt according to claim 1, wherein the belt is set so as to decrease only at a portion.   3. The continuously variable transmission belt according to claim 2, wherein the first characteristic of the main surface of the first element is a curved line, and the second characteristic of the back surface of the second element is a straight line. . The continuously variable transmission belt according to any one of claims 1 to 3, wherein the first element and the second element have the same maximum thickness in the circumferential direction.

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