Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G1/00—Driving-belts
  • F16G1/06—Driving-belts made of rubber
  • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
  • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
  • F16G1/00—Driving-belts
  • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H7/00—Gearings for conveying rotary motion by endless flexible members
  • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
  • F16H7/023—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley

Definitions

• the present invention relates to a synchronous transmission belt.
• the invention also relates to an assembly comprising the belt and at least one associated pulley.
• the invention also relates to a method of manufacturing such a belt.
• the transmission system may be useful for the transmission system to include a guiding means.
• solutions which consist of placing flanges on the pulley, on either side of the belt.
• the belt tends to rub against these elements, which accelerates its wear and prevents the evacuation of foreign elements such as water or gravel.
• this principle is restrictive in terms of making the pulleys and machining the teeth of the belt.
• the groove created on the belt by this machining can be damaged by the insertion of foreign bodies during operation.
• These foreign bodies can, for example, be mud or gravel when such a system is used for a bicycle application.
• documents EP-B1 -3 478 561 and WO-A1 -2021/180678 each propose a synchronous belt whose transverse teeth each have a rounded top, in particular with an overall arc-shaped profile.
• the web for its part, whether positive (on the pulley) or negative (on the belt), then only fulfills a lateral blocking function for the belt.
• Document CN-U-208 651 535 proposes a synchronous belt whose transverse teeth each have a straight trapezoid profile. This document also proposes a V-shaped longitudinal tooth between each transverse tooth.
• the belt must rest on the pulley with the largest possible contact surface, while limiting the mechanical constraints linked, in particular, to the winding of the pulley. the belt and the shape of the teeth.
• an objective of the invention is to propose a synchronous transmission belt not having, at least, one of the aforementioned drawbacks.
• Another objective of the invention is to propose a synchronous transmission belt offering improved performance on the torque transmissible between two pulleys.
• a synchronous transmission belt comprising an elastomer-based body comprising a dorsal portion, a ventral portion and a set of traction cables between the dorsal portion and the ventral portion, the ventral portion having, of on the other hand, a plurality of transverse teeth, each transverse tooth having in section a first profile with two inclined sides converging towards one another in the direction of a vertex of the transverse tooth, the sides of the transverse tooth being connected by less a rounded part, each transverse tooth having a tooth height H1, and, on the other hand, a plurality of longitudinal teeth, each longitudinal tooth extending between two transverse teeth substantially perpendicular to the transverse teeth and having in section a second profile with two inclined sides, converging towards one another in the direction of a top of the longitudinal tooth, the sides of the longitudinal tooth being connected by at least one rounded part, each longitudinal tooth having a tooth height H2, this height H2, non-zero, being less than or equal to the tooth height H1.
• the contact surface between the belt and the pulley intended to receive it is high thanks to the profiles of the teeth, and in particular thanks to the longitudinal teeth which not only have a function of guiding the belt on the pulley but participate, with the shape of their profile, in the transmission of torque, jointly with the transverse teeth.
• the presence of cables improving the traction modulus of the belt, the transmissible torque can be controlled.
• the belt may comprise one or more of the characteristics below, taken in isolation from each other or in combination with each other:
• each longitudinal tooth is strictly less than the tooth height H1 of each transverse tooth
• each transverse tooth has a first trapezoidal profile in section with rounded corners, - the first profile of each transverse tooth comprises two top convex portions, these top convex portions being located on either side of a top portion, and two concave portions, said concave portions being located on either side of a base of the transverse tooth,
• each convex top portion of the first profile has an approximate radius of curvature of between 0.6 mm and 1.4 mm, and each concave portion has a radius of curvature of between 0.6 mm and 1.4 mm,
• each longitudinal tooth comprises two concave portions, these concave portions being located on either side of a base of the longitudinal tooth, and a tooth apex, said apex being convex,
• each concave portion of the second profile has a radius of curvature of between 0.8 mm and 1.6 mm, and said vertex of the second profile has a radius of curvature of between 0.8 mm and 1.6 mm,
• each longitudinal tooth is a trapezoidal profile with rounded corners
• the synchronous transmission belt comprises a coating arranged at an external surface of the plurality of transverse and longitudinal teeth
• the elastomer-based belt body is a material chosen from an ethylene-alpha-olefin or a polyurethane, and the coating is a textile material or an elastomeric thermoplastic film,
• each cord in the set of traction cords is made of aramid, polyester, glass fibers or carbon fibers or a combination of these,
• the transverse teeth are distributed with a pitch of 11 mm.
• the invention also relates to an assembly comprising at least one pulley and a synchronous transmission belt as described in the above, each pulley comprising: two circumferential rows of teeth parallel to each other and configured to receive the recesses of teeth of the plurality of transverse teeth of the belt, and - a circumferential groove, separating the two circumferential rows of teeth, configured to receive the plurality of longitudinal teeth of the belt.
• the assembly may comprise one or more of the characteristics below, taken in isolation from each other or in combination with each other: the assembly comprises a first pulley of given dimension and a second pulley of different size from the first pulley,
• the assembly comprises a first pulley and a second pulley which are identical
• each circumferential row of teeth comprises tooth recesses having a depth P1 greater than a height H1 of the transverse teeth of the belt
• the longitudinal groove has a depth P2 greater than a height H2 of the longitudinal teeth of the belt
• each pulley is made of a material chosen from steel, aluminum or plastic.
• the invention also relates to a method of manufacturing a synchronous transmission belt as described in the above, the method comprising the following steps:
• Figure 1 represents a schematic partial perspective view of a belt according to the invention
• Figure 2 represents a schematic profile view of the belt of Figure 1
• Figure 3 represents a schematic profile view of another embodiment of a synchronous transmission belt according to the invention.
• Figure 4 represents a schematic cross-sectional view of the belt of Figure 1
• Figure 5 represents a schematic cross-sectional view of another embodiment of the synchronous transmission belt according to the invention.
• Figure 6 represents a schematic view of a step of a process for manufacturing a belt according to the invention, in particular the positioning of a belt blank in a mold,
• Figure 7 represents a schematic view in longitudinal section of a detail of the step of the process of Figure 6,
• Figure 8 represents a schematic view of another step of the method of manufacturing a belt according to the invention, in particular the positioning of an inflatable bladder inside the blank,
• Figure 9 represents a schematic view in longitudinal section of a detail of the step of the process of Figure 8,
• Figure 10 represents a schematic view of another step of the method of manufacturing a belt according to the invention, in particular the printing of the pattern of the mold on the blank,
• Figure 11 represents a schematic view in longitudinal section of a detail of the step of the process of Figure 10,
• Figure 12 represents a schematic view of another step of the method of manufacturing a belt according to the invention, in particular the removal of the molded blank
• Figure 13 represents a schematic view of a tensile strength test of the belt according to the invention
• Figure 14 represents a schematic perspective view of an assembly according to the invention comprising at least one pulley and a synchronous transmission belt,
• Figure 15 represents a schematic profile view of the assembly of Figure 14.
• Figure 16 represents a schematic cross-sectional view of the assembly of Figure 14.
• Figure 1 shows a perspective view of an embodiment of a synchronous transmission belt 100 according to the invention.
• the synchronous transmission belt 100 comprises an elastomer-based body 102 and a set of traction cables 110.
• the elastomer-based body 102 comprises a dorsal portion 104.
• This elastomer-based body 102 also comprises a ventral portion 106, formed of a plurality of teeth 112, 112', 114, 114'.
• This plurality of teeth 112, 112', 114, 114' comprises on the one hand a plurality of transverse teeth 112, 112' and on the other hand a plurality of longitudinal teeth 114, 114'.
• the plurality of transverse teeth 112, 112' and the plurality of longitudinal teeth 114, 114' each include an external surface configured to cooperate, at least in part, with a tooth recess of a pulley.
• Each transverse tooth 112, 112' has, in addition, in section a first profile 116 with two inclined flanks 117 converging towards one another towards the top of the tooth, these two flanks 117 being, moreover , connected by at least one rounded part at the summit.
• the first profile 116 of the transverse teeth 112, 112’ has a shape defining at least one curvature.
• this first profile 116 can be trapezoidal with rounded corners.
• the top of each transverse tooth 112, 112' defines a top portion 116a, of non-zero dimension, parallel or not to an imaginary base 116b of the transverse tooth 112, 112' (represented by a broken line in Figure 2) , itself parallel to the dorsal portion 104 of the belt 100.
• the top of each transverse tooth 112, 112' defines a top portion 116a, of non-zero dimension, parallel or not to the dorsal portion 104 of the belt 100. It is then understood that the dorsal portion 104 of the belt 100 is substantially flat and that the top portion 116a is also substantially flat.
• the first profile 116 of the transverse teeth 112, 112' comprises, on the one hand, at least one angle describing a curvature in a convex manner at the level of the top of the transverse tooth 112, 112 ', called the convex top portion 116c, and/or, on the other hand, at least one angle describing a curvature in a concave manner at the level of the tooth cavity 120, called the concave portion 116d.
• the first profile 116 of the transverse teeth 112, 112' advantageously comprises a top portion 116a of a substantially flat tooth, at least one convex top portion 116c and at least one concave portion 116d at the bottom of the tooth recesses 120.
• the top portion 116a of the transverse teeth 112, 112' can have a non-zero dimension of between 3 mm and 6 mm.
• the summit convex portion 116c is the result of a cubic spline of several points, or nodes, of the first profile 116. In this way, an equal convexity on either side of each point is defined. Furthermore, an approximate radius of curvature R1 can be determined for this convex summit portion 116c.
• the convex top portion 116c has an approximate radius of curvature R1 which can be between 0.6 mm and 1.4 mm.
• the concavity of the concave portion 116d is directly dependent on the spline obtained and described previously. In other words, the radius of curvature R2 of the concave portion 116d depends on this spline.
• each transverse tooth 112, 112' having an axis of symmetry Y we understand that the first profile 116 of each transverse tooth 112, 112' comprises, when it is trapezoidal with rounded corners, two convex top portions 116c, located on either side of the top portion 116a, and two concave portions 116d, located on either side of the base 116b.
• the first profile 116 of each transverse tooth 112, 112' can be defined as being the component of a segment between two points, of a bitangent radius between this segment and the base 116b of the tooth, in other words a concave portion 116d, and a spline tangent to both the segment and a straight line tangent to the top of the transverse tooth 112, 112'.
• This type of profile allows, in use, a higher torque transmission by the belt 100 but can lead to a reduction in the quality of the meshing. Furthermore, this also makes it possible to reduce the stress on the transverse tooth 112, 112' as well as its deformation.
• Each longitudinal tooth 114, 114' of the plurality of longitudinal teeth 114, 114' extends, moreover, between two transverse teeth 112, 112', and this, substantially perpendicular to these transverse teeth 112, 112'.
• the belt 100 therefore has crossed teeth.
• a single longitudinal tooth 114, 114' advantageously extends between two transverse teeth 112, 112'.
• Each longitudinal tooth 114, 114' has, in addition, in section a second profile 118 with two inclined flanks 119 converging towards one another towards the top of the tooth, these two flanks 119 being further connected by at least one rounded part at the top level.
• the sides 119 can, taken together, have a generally V or U shape for example.
• the second profile 118 of the longitudinal teeth 114, 114’ has a shape defining at least one curvature.
• each longitudinal tooth 114, 114' may have a vertex defining a summit portion 118a, of zero dimension.
• the top of the longitudinal tooth 114, 114' is convex and describes an arc of a circle.
• the second profile 118 of the longitudinal teeth 114, 114' advantageously comprises at least one concave portion 118d at the bottom of the tooth recesses 120 and a convex tooth apex 118c.
• the concave portion 118d at the bottom of the tooth recesses 120 has a radius of curvature R2' of between 0.8 mm and 1.6 mm.
• the convex tooth apex 118c has a radius of curvature R3 of between 0.8 mm and 1.6 mm.
• Each longitudinal tooth 114, 114' has an axis of symmetry. We therefore understand that the second profile 118 of each longitudinal tooth 114, 114' comprises two concave portions 118d, located on either side of the base 118b and a convex tooth apex 118c.
• each longitudinal tooth 114, 114' can be trapezoidal with rounded corners, that is to say substantially similar to the first profile 116, described previously.
• the top of each longitudinal tooth 114, 114' defines a top portion 118a, of non-zero dimension, parallel or not to an imaginary base 118b of the longitudinal tooth 114, 114', itself parallel to the portion dorsal 104 of the belt 100.
• the top of each longitudinal tooth 114, 114' defines a top portion 118a, of non-zero dimension, parallel or not to the dorsal portion 104 of the belt 100.
• the dorsal portion 104 of the belt 100 is substantially flat and the top portion 118a is also substantially flat. While the at least one curvature is defined, on the one hand, by at least one angle describing a curvature in a convex manner at the level of the apex of the longitudinal tooth 114, 114', and/or, on the other hand, at minus an angle describing a curvature in a concave manner at the level of the tooth hollow 120.
• the second profile 118 of the longitudinal tooth 114, 114' having an axis of symmetry Y', it is understood that the second profile 118 of each longitudinal tooth 114, 114' has two convex top portions, located on either side of the top portion 118a, and two concave portions 118d, located on either side of the base 118b.
• each longitudinal tooth 114, 114' connected by the rounding, form, between them, an angle whose value is between 30° and 50°.
• the value of this angle is between 30° and 45°, and preferably between 35° and 45°.
• the transverse teeth 112, 112' have a tooth height H1 and the longitudinal teeth 114, 114' have a tooth height H2. Tooth height H2, non-zero, of the longitudinal teeth 114, 114' is less than or equal to the tooth height H1 of the transverse teeth 112, 112'.
• the non-zero tooth height H2 of the longitudinal teeth 114, 114' is strictly less than the tooth height H1 of the transverse teeth 112, 112'.
• a tooth height H2 of the longitudinal teeth 114, 114' lower than a tooth height H1 of the transverse teeth improves the bending flexibility of the belt 100. Improved bending facilitates the winding of the belt 100 on pulleys with a small diameter. This last characteristic is, in particular, sought after for a bicycle application for example.
• the tooth height H1 of the transverse teeth 112, 112' can be between 2.5 mm and 5 mm.
• the tooth height H2 of the longitudinal teeth 114, 114' when strictly less than the tooth height H1 of the transverse teeth 112, 112', can be such that 0.4 x H1 ⁇ H2 ⁇ 1.0 x H1.
• the tooth height H2 is such that 0.4 x H1 ⁇ H2 ⁇ 0.9 x H1, still advantageously such that 0.4 x H1 ⁇ H2 ⁇ 0.8 x H1, and preferably such that 0.5 x H1 ⁇ H2 ⁇ 0.8 x H1.
• the transverse teeth 112, 112' serve, in use, for the passage of torque, and this passage of torque is all the higher due to the presence of inclined flanks 117 connected to each other by at least a rounded part. Furthermore, the longitudinal teeth 114, 114' also ensure the transmission of torque in addition to a self-centering function of the belt 100. In fact, the angle formed by the flanks 119 introduced by the profile 118 of the longitudinal tooth 114, 114', as previously described, participate in torque transmission. In addition, the rounded shape of the profile 118 allows the belt 100, in the event of lateral movement thereof, to self-center more quickly on the pulley on which it is intended to be mounted, improving its guidance.
• the presence of the longitudinal teeth 114, 114' also limits the deformation of the transverse teeth 112, 112'. This torque transmission and this guidance are both improved also because the tooth height H2 of the longitudinal tooth 114, 114' is less than or equal to the tooth height H1 of the transverse tooth 112, 112'. Indeed, in the case where a tooth height H2 would be greater than the tooth height H1, constraints may appear, including a reduction in the flexibility of the belt 100 and a lack of suitability with the pulleys on which the belt 100 would be intended to cooperate.
• the transverse teeth 112, 112' of the belt 100 can be distributed with a pitch of 8 mm, 11 mm or 14 mm.
• the transverse teeth 112, 112' of the belt 100 are distributed with a pitch of 11 mm.
• the belt 100 also includes a set of traction cables 110.
• the cables 110 are embedded in the body 102 between the dorsal portion 104 and the ventral portion 106 of the body 102.
• the cables 110 make it possible to increase the traction modulus of the belt 100. They therefore extend along the length of the belt and are arranged next to each other over the width of the body 102.
• a cable 110 of the set of cables can in particular be made of a material chosen from aramid, polyester, glass fibers or fibers of carbon, or a combination thereof. They therefore make it possible, for the application considered, to authorize greater torque transmission while maintaining a very limited elongation of the belt 100.
• each cord 110 The constitution of each cord 110, the number of cords 110 arranged in the width of the belt 100 and the choice of the material constituting them is variable and depends on the traction module sought for the belt 100 to ensure torque transmission in limiting the elongation of the belt 100.
• the presence of such cables 110 has the general effect of allowing higher torque transmission.
• the traction modulus of the belt 100 is chosen between 10,000 N/mm of belt width (Newton per millimeter of belt width) and 30,000 N/mm of belt width, measured linearly between 0 and 1%. lengthening the belt.
• the synchronous transmission belt 100 may also include a coating 122 arranged at the external surface of the plurality of teeth 112, 112', 114, 114', as shown in Figures 3 and 5.
• the coating 122 has a particular interest in reinforcing the tooth base, that is to say the concave portions 116d, 118d of the transverse teeth 112, 112' and the longitudinal teeth 114, 114'.
• the covering 122 can typically be made of a textile material chosen, in a non-limiting manner, from a knitted fabric, a fabric or a non-woven fabric. In this case, the covering 122 can be made of a material typically chosen from a polyamide (PA) or a polyamide-elastane mixture.
• the coating 122 can be a thermoplastic elastomeric film having a polymer matrix which is the combination of a thermoplastic matrix and an elastomeric matrix.
• the elastomeric part of the elastomeric thermoplastic is advantageously an ethylene-alpha-olefin such as ethylene-propylene-monomer (EPM) or ethylene-propylene-diene monomer (EPDM).
• the thermoplastic matrix of the elastomeric thermoplastic is advantageously an olefinic thermoplastic, for example a low density polyethylene.
• This elastomeric thermoplastic film may have a thickness of between 50 pm (micrometer) and 200 pm.
• the elastomer-based body 102 of the belt 100 may be made of a material chosen in a non-limiting manner from an ethylene-alpha-olefin such as ethylene-propylene-monomer (EPM) or ethylene-propylene-diene. monomer (EPDM), a hydrogenated butadiene-acrylonitrile copolymer (HNBR) or polyurethane (PU).
• EPM ethylene-propylene-monomer
• HNBR hydrogenated butadiene-acrylonitrile copolymer
• PU polyurethane
• the elastomer-based body 102 is made of peroxide-vulcanized ethylene-propylene-diene monomer (EPDM) with, in this example, a hardness of 85 Shore A.
• EPDM peroxide-vulcanized ethylene-propylene-diene monomer
• the belt 100 has a geometry defined as follows and illustrated by Figures 2 and 4.
• the body 102 has a thickness T of 6.5 mm, taken from the dorsal portion 104 at the top of the teeth transverse 112, 112 ', and a width of 12 mm.
• Each transverse tooth 112, 112' has a height H1 of 5 mm. Furthermore, in this exemplary embodiment, the first profile 116 of each transverse tooth 112, 112' is trapezoidal with rounded corners. This first profile 116 has a top portion 116a of 2 mm and a top convex portion 116c whose approximate radius of curvature R1 is 1.2 mm. [0086] Each longitudinal tooth 114, 114' has a height H2 of 2.2 mm.
• each longitudinal tooth 114, 114' has a concave portion 118d at the bottom of the tooth recesses 120 with a radius of curvature R2' of 1.2 mm and a convex tooth apex 118c with a radius R3 curvature of 1.6 mm.
• the inclined sides 119 connected by at least one rounded part of the second profile 118 of each longitudinal tooth 112, 112' form, between them, an angle of 40°.
• the set of cables 110 embedded in the body 102 comprises 13 cables 110.
• the cables 110 have a diameter d of 0.8 mm and their centers are separated laterally by a pitch p of 0.92 mm.
• the center of each cable 110 is also located at a distance of approximately 0.7 mm from the dorsal part 104 of the belt 100.
• Each cord 110 is made of aramid, and in particular an aramid 1100x1x4, that is to say that each yarn has a density of 1100 dtex (decitex), or 1100x10 7 kg/m (kilogram per meter), and that each wire is first twisted individually before being twisted in fours.
• Each cable 110 also has a Young's modulus of 30,000 MPa (MegaPascal), or 30,000 N/mm 2 (Newton per square millimeter).
• the traction modulus of the belt can thus be calculated and is expressed as being the multiplication of the Young's modulus of the cable 110 with the surface area of the cable 110.
• the belt 100 counts 13 cables 110 whose diameter d of each cable 110 is 0.8 mm, i.e. a total cross-sectional area of approximately 6.53 mm 2 . This set of cables 110 thus makes it possible to define the traction modulus of the belt 100 at a value of approximately 196100 N.
• the transmission belt 100 comprises a coating 122, visible in Figures 3 and 5.
• This coating 122 is a polyamide knit, in particular a polyamide 66 with a weight of 150 g/m 2 (gram per square meter).
• the transverse teeth 112, 112' of the belt 100 are distributed with a pitch of 11 mm.
• This step also has the advantage of allowing optimized torque transmission and space requirements. Indeed, with a lower pitch, the transmission of torque is less while with a higher pitch, the size due to the size of the teeth increases.
• Figures 6 to 12 illustrate steps in manufacturing a belt 100 according to the aforementioned embodiment.
• the method of manufacturing a belt 100 according to the invention consists of:
• the belt materials which form the blank 10 are placed on a cylindrical mandrel (not shown). These belt materials include the dorsal portion 104 (in the raw state) of the belt body 102, the cords 110 and the ventral portion 106 (in the raw state) of the belt body 102. These belt materials may also include the covering 122, placed on the ventral portion 106 of the belt body 102.
• the blank 10 has been removed from the cylindrical mandrel and is already inserted inside the cylindrical mold 12 which has on its internal cylindrical wall at least one pattern, negative of the profile of the transverse teeth 112,112' and longitudinal teeth 114, 114' to be formed on a belt.
• the ventral portion 106 in the raw state
• the ventral portion 106 is positioned in contact with the mold 12.
• the inflatable bladder 14 is inflated, with a pressure of 20 bars, so as to press the dorsal portion 104 (in the raw state) of the blank 10 against the mold 12 ( see arrow E in figure 11).
• the internal wall of the mold 12 with at least one pattern, negative of the teeth 112,112', 114, 114' to be formed on a belt, forms a corresponding pattern on the external surface of the ventral portion 106 of the blank 10
• the mold 12 is heated to 182°C to ensure vulcanization of the dorsal 104 and ventral 106 portions intended for. form the body 102 in vulcanized elastomer.
• the pattern of the mold 12 is printed on the blank 10 during this step.
• the belt 100 shows no cracks, breaks or delamination, in accordance with the recommendations of the standards.
• the invention also relates to an assembly 300 comprising a synchronous transmission belt 100 as described in the above and at least one pulley 200.
• the assembly 300 can advantageously be presented in the form of a kit or be already assembled.
• the belt 100 is intended to be mounted, in use, on two pulleys 200, that is to say a first pulley and a second pulley.
• Each of the pulleys 200 comprises, on the one hand, two circumferential rows of teeth 210, 210' parallel to each other and configured to receive the tooth recesses 122 of the plurality of transverse teeth 112, 112' of the belt 100 and comprises, d on the other hand, a circumferential groove 220, separating the two circumferential rows of teeth 210, 210', configured to receive the plurality of longitudinal teeth 114, 114' of the belt 100.
• the assembly 300 comprises a first pulley of a given dimension and a second pulley of a different dimension from the first pulley (not shown).
• different dimension we mean a second pulley whose diameter is greater or less than the diameter of the first pulley.
• the assembly 300 comprises a first pulley and a second pulley which are identical.
• identical we mean two pulleys which have the same dimensions, for example the same diameter and rows of teeth 210, 210' with the same geometries.
• Each pulley 200 can be made of a material chosen, in a non-limiting manner, from steel, aluminum or plastic. Each of these materials has properties in terms of mechanical resistance, density or cost which can be adapted to predefined applications.
• Each circumferential row of teeth 210, 210' further comprises tooth recesses 212 having a depth P1.
• this depth P1 is greater than the height H1 of the transverse teeth 112, 112' of the belt 100.
• the circumferential groove 220 of each pulley 200 also has a depth P2.
• this depth P2 is greater than the height H2 of the longitudinal teeth 144.
• the teeth of each of the circumferential rows of teeth 210, 210' can be distributed with a pitch of 8 mm, 11 mm or 14 mm.
• This clearance 230 has the advantage of being a means of evacuating foreign bodies, such as mud, water or stones, which could, in operation, be inserted into the assembly 300, and more particularly between a pulley 200 and the belt 100. These foreign bodies being evacuated more easily, the risks of wear of the belt 100 are reduced.
• the belt according to the invention allows an improvement in the torque transmissible by the belt and its stability.
• the contact surface between the transverse and longitudinal teeth of the belt and the teeth of the pulley is high thanks to the shapes of the teeth of the belt.
• This high contact surface and the presence of cables improving the traction modulus of the belt the transmissible torque can be controlled as well as the deformation levels of the belt, which reduces the wear of the belt over time, and therefore improves its lifespan.
• the longitudinal teeth make it possible to guide the belt on the pulley and thus avoid lateral movement thereof.
• Another advantage is to allow, when the belt is mounted on a pulley of the assembly according to the invention, to evacuate the external elements which can be inserted into the tooth recesses of the pulley, such as for example water, earth, mud or even stones.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Pulleys (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=85381057

Family Applications (1)

Country Status (4)

Family Cites Families (3)

• 2022
  • 2022-12-08 FR FR2212989A patent/FR3143077B1/fr active Active
• 2023
  • 2023-12-07 EP EP23820891.2A patent/EP4630704A1/de active Pending
  • 2023-12-07 CN CN202380083533.8A patent/CN120303497A/zh active Pending
  • 2023-12-07 WO PCT/EP2023/084731 patent/WO2024121319A1/fr not_active Ceased

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