CVT steel belt system

Abstract

A CVT steel belt system belongs to the technical field of CVT transmissions and comprises a plurality of first chain pieces and a plurality of second chain pieces distributed among the first chain pieces at equal intervals, the two sides of the first chain pieces and the two sides of the second chain pieces are provided with highly-asymmetric saddles respectively, and the two sides of the first chain pieces and the two sides of the second chain pieces are connected in series through first steel ring modules and second steel ring modules respectively. Limiting structures used for restraining the first steel ring module or the second steel ring module are arranged on the two sides of the second chain piece, the first steel ring module and the second steel ring module are matched with the corresponding saddles and each comprise a plurality of steel rings which are stacked up and down, and the steel rings which are stacked up and down form a strength and toughness gradual change structure. Two pushing piece structures with asymmetric saddle heights are designed, lateral limiting of the steel ring module can be achieved, steel rings of different layers can be reasonably arranged, the design redundancy is reduced, meanwhile, the strength and toughness of the steel rings are reasonably optimized, and by means of the steel ring combination mode with the strength gradually changed from bottom to top, the stability of the steel ring module is improved. And the use performance of the steel belt system is improved.

Description

Technical Field

[0001] This invention belongs to the field of CVT transmission technology, specifically relating to a CVT steel belt system. Background Technology

[0002] Currently, traditional CVT steel belt systems are generally assembled from chain links and steel ring modules that are symmetrical on both sides and open at the saddle. At the factory, the two are often tied together with cable ties. Because the chain links are all open and there is no limit between the chain link saddle and the steel ring, the steel ring module often detaches from the push plate and falls apart after the cable ties are untied during installation.

[0003] Furthermore, the symmetrical structure of the pusher plate ensures consistent strength on both sides of the steel ring module in existing designs. However, during actual operation of the steel belt system, the impact on the steel ring module corresponding to the actively pressurized conical wheel side is far greater than that on the passive side. This means the steel ring modules on both sides cannot achieve a good strength match, with one side always failing first, while the other side has design redundancy. Additionally, since the steel ring module is composed of several layers of stacked steel rings, the bottommost steel ring has the smallest radius of curvature, while the topmost steel ring has a larger radius of curvature. These two layers actually have different requirements for toughness and strength; that is, the former requires more toughness than strength, and the latter requires more strength than toughness. However, existing technologies do not address these issues; the strength and toughness of each layer of steel rings in their steel belt structure are almost identical, which limits further improvements in the performance of the steel belt system.

[0004] Therefore, optimizing the existing steel strip system and solving the problems of assembly disintegration and strength mismatch is the key to optimizing the entire steel strip system. Summary of the Invention

[0005] This invention discloses a CVT steel belt system. The system is designed with two pusher structures with asymmetrical saddle heights. This not only enables lateral positioning of the steel ring module to prevent it from falling apart, but also allows for the reasonable arrangement of different layers of steel rings according to actual working conditions. This reduces design redundancy while optimizing the strength and toughness of the steel rings. Through a steel ring combination pattern with gradually increasing strength from bottom to top, the performance of the steel belt system is improved.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A CVT steel belt system includes a plurality of chain links 1 arranged sequentially and tightly fitted together, and a plurality of chain links 2 distributed at equal intervals between the chain links 1. The chain links 1 and 2 each have highly asymmetrical saddles on both sides. The chain links 1 and 2 are connected in series by steel ring modules 1 and 2 respectively, forming a ring-shaped steel belt. The chain links 2 are provided with limiting structures on both sides to constrain the steel ring modules 1 or 2. The steel ring modules 1 and 2 cooperate with the corresponding saddles and each includes a plurality of steel rings stacked vertically, forming a strength-toughness gradient structure.

[0007] Preferably, the chain link includes a triangular top A, a neck A integrally connected to the middle of the bottom edge of the top A, and a trapezoidal bottom A integrally connected to the lower end of the neck A. The two side ends of the bottom A are used to cooperate with the active cone wheel or the passive cone wheel. The two shoulders of the bottom A and the top A are located between the bottom edges on both sides of the neck A to form a saddle. The relationship between the saddle height h1 on the side closer to the active cone wheel and the saddle height h2 on the other side satisfies: h1 = (110% to 130%) * h2.

[0008] Preferably, the second chain link includes a circular plate-shaped top B, a neck B integrally connected to the bottom end of the top B, and a trapezoidal bottom B integrally connected to the lower end of the neck B. The bottom B has the same structure as the bottom A, except that: a limiting platform is fixedly provided on the outer edge of the top of the bottom B to restrict the outward movement of the steel ring. The limiting platform constitutes a limiting structure and its outer surface is detached from the cone wheel.

[0009] Preferably, the neck B has groove structures on both sides, and the bottom B of the chain piece two forms a saddle structure between the two shoulders and the top of the groove structure. The height of the saddle structures on both sides is the same as that of the chain piece one. The inner surface of the limiting platform facing one end of the neck B is an inclined surface, which is used to guide the running fluctuation of the steel ring module one or the steel ring module two.

[0010] Preferably, the first and second steel ring modules include several steel rings stacked one on top of the other, the height of the limiting platform is less than or equal to the thickness of the bottommost steel ring, and in the second chain link, the distance W1 between the root of the limiting platform and the neck B on the same side is equal to the width W2 of the steel ring in its natural state.

[0011] Preferably, the number of chain pieces two is a multiple of 4.

[0012] Preferably, the first steel ring module and the second steel ring module are each composed of several layers of steel rings with different thicknesses, and the number of layers between the two is different. The first steel ring module is located on the saddle facing the active cone wheel and has more layers of steel rings than the second steel ring module.

[0013] Preferably, in the first and second steel ring modules, the thickness of the steel ring increases layer by layer from bottom to top, the strength of the steel ring increases layer by layer from bottom to top, and the toughness decreases layer by layer from bottom to top.

[0014] The beneficial effects of the CVT steel belt system of the present invention are as follows: 1. This invention solves the problem of traditional CVT systems falling apart by designing two different CVT chain structure without affecting performance.

[0015] 2. This invention breaks through the technical limitations of traditional CVT chain links and designs an asymmetrical structure for CVT chain links. Based on the actual operating characteristics of the CVT steel belt system, by designing the two sides asymmetrically, it not only ensures the normal operating strength of the CVT steel belt system, but also avoids design redundancy.

[0016] 3. This invention addresses the different operating radii of curvature of the individual steel rings in the steel ring module, and the gradual increase in strength of each layer of steel rings from bottom to top. This not only ensures the toughness of the lower steel ring but also improves the strength of the upper steel ring, thereby improving the overall performance of the CVT steel belt system. Attached Figure Description

[0017] Figure 1 A partial schematic diagram of a CVT steel belt system; Figure 2 Schematic diagram of chain link; Figure 3 Schematic diagram of chain link 2; Figure 4 Schematic diagram of the steel ring module structure; Figure 5 A side view of the arrangement of chain link 2 on the steel belt.

[0018] 1. Chain link one; 101. Top A; 102. Neck A; 103. Bottom A; 104. Saddle; 2. Chain link two; 201. Top; 202. Neck B; 203. Groove structure; 2-1. Limiting platform; 2-1-1. Inclined surface; 3. Steel ring module one; 4. Steel ring module two; 5. Steel ring. Detailed Implementation

[0019] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0020] The following embodiments can be understood as illustrating a part of the structure or method of the present invention individually, or as combining the embodiments to explain the broader structure or method of the present invention.

[0021] Example 1: A CVT steel belt system, such as Figure 1-5 As shown, it includes several chain links 1 arranged sequentially and closely fitted together, and multiple chain links 2 evenly distributed between the chain links 1. The two sides of the chain links 1 and chain links 2 are connected in series by steel ring modules 3 and 4 respectively, and form a ring-shaped steel strip through the series connection. The two sides of the chain links 2 are provided with limiting structures to constrain the steel ring modules 3 or 4. The limiting structures prevent the steel ring modules 3 or 4 from falling apart during installation.

[0022] Example 2: like Figure 2 As shown, the chain link 1 includes a triangular top A101, a neck A102 integrally connected to the middle of the bottom edge of the top A101, and a trapezoidal bottom A103 integrally connected to the lower end of the neck A102. The two side ends of the bottom A103 are used to cooperate with the active cone wheel or the passive cone wheel. The two shoulders of the bottom A103 and the top A101 are located between the bottom edges on both sides of the neck A102 to form a saddle 104. The relationship between the saddle height h1 on the side closer to the active cone wheel and the saddle height h2 on the other side satisfies: h1 = (110% to 130%) * h2. Because the steel rings on the side closer to the drive cone pulley experience greater impact, their strength needs to be increased to prevent premature failure. This invention addresses this by using asymmetrical chain links, designing the saddle height on the side closer to the drive cone pulley to be 110% to 130% of the saddle height on the other side. This allows for the placement of more steel rings in the saddle on the side closer to the drive cone pulley, in a more suitable quantity. In contrast, in existing technologies, the steel rings on both sides of the steel belt have the same number of layers and the same strength, resulting in the side closer to the drive cone pulley experiencing greater impact and premature failure, thus shortening the service life of the steel belt.

[0023] Example 3: like Figure 3 As shown, the chain link 2 includes a circular plate-shaped top B201, a neck B202 integrally connected to the bottom end of the top B201, and a trapezoidal bottom B (not marked in the figure) integrally connected to the lower end of the neck B202. The bottom B has the same structure as the bottom A103, except that: the outer edge of the top of the bottom B is fixed with a limiting platform 2-1 to restrict the outward movement of the steel ring. The outer surface of the limiting platform 2-1 is detached from the cone wheel to avoid wear failure.

[0024] like Figure 3As shown, the neck B202 has groove structures 203 on both sides. The bottom B of the chain link 2 also forms a saddle structure between the two shoulders and the top of the groove structure 203. The height of the saddle structure on both sides is the same as that of the chain link 1. The inner surface of the limiting platform 2-1 facing the neck B202 is an inclined surface 2-1-1. The inclined surface 2-1-1 is used to guide the running fluctuation of the steel ring module 3 or the steel ring module 4.

[0025] Example 4: like Figure 3 , 4 As shown, the steel ring module 1 3 and steel ring module 2 4 include several steel rings 5 ​​stacked on top of each other. The height of the limiting platform 2-1 is less than or equal to the thickness of the bottom layer steel ring 5 (if the height of the limiting platform 2-1 exceeds the thickness of the bottom layer steel ring, the steel ring may float up and down during high-speed operation of the CVT system, and the limiting platform 2-1 may come into contact with the gap between the two layers of steel rings, resulting in a large difference in the stress on the steel ring layers and the risk of local breakage). In the chain link 2, the distance W1 between the root of the limiting platform 2-1 and the neck B202 on the same side is equal to the width W2 of the steel ring 5 in its natural state.

[0026] During installation, the steel ring module is in its natural state. The distance W1 between the root of the limiting platform and the neck B on the same side is equal to the width W2 of the steel ring in its natural state. Chain link 2 can be installed smoothly, and the limiting platform 2-1 of chain link 2 can restrict the lateral displacement of the steel ring, preventing the steel belt system from falling apart. When the steel belt system is running, each steel ring of the steel ring module is subjected to tension. Due to the cooperation of the limiting platform and the groove structure, the steel ring module is confined within the area of ​​the saddle height, achieving a good cooperative effect with chain link 1.

[0027] It should be noted that chain link two provides lateral restraint for the steel rings, while chain link one provides vertical restraint. When the restraint platform is installed, in the initial state, the steel rings are not tightened by the driving and driven conical pulleys. Therefore, the steel belts are compressed between the shoulders of the top A and bottom A103 of chain link one. Combined with the lateral restraint of the restraint platform, this makes it difficult for the belt to fall apart even if the straps are untied. During operation, the steel rings are tightened, achieving the effect of power transmission.

[0028] like Figure 5As shown, the number of chain links 2 is a multiple of 4 and is evenly distributed along the steel strip (4 times the number of chain links 2 ensures that chain links 2 are symmetrically arranged between the driving and driven cone pulleys, meaning that the number of chain links 2 in contact with both the driving and driven cone pulleys is almost the same, maximizing the uniformity of the limiting force on the entire steel strip). During the steel strip assembly, the top A and top B have the same height, and the shoulder heights of the bottom A and bottom B are the same. That is, the tops of top A and top B are on the arc-shaped top surface of the steel strip, and the shoulders of bottom A and bottom B smoothly match the curved shape of the steel rings (both contacting the bottommost steel ring).

[0029] Example 5: like Figure 3 , 4 As shown, steel ring module 3 and steel ring module 4 are each composed of several layers of steel rings with different thicknesses, and the number of layers differs between them. Steel ring module 3 is located in the saddle section facing the driving cone wheel, and its number of steel ring layers is greater than that of steel ring module 4. In other words, the side closer to the driving cone wheel experiences greater impact, and the steel ring strength required on this side is greater, i.e., more steel ring layers are needed.

[0030] like Figure 3 As shown, in the steel ring module 3 and steel ring module 4, the thickness of the steel ring 5 increases layer by layer from bottom to top, the strength of the steel ring increases layer by layer from bottom to top, and the toughness decreases layer by layer from bottom to top. Since the radius of curvature is smallest at the innermost point of the steel ring when turning, the required toughness is higher, otherwise it is easy to break. Therefore, the thinner the steel ring and the lower its strength, the further outward it is, the lower the toughness requirement and the higher the strength requirement. Hence, the steel ring is thicker.

[0031] It should be noted that: As a common design feature, the front and rear sides of the head of both chain links 1 and 2 are provided with matching grooves and protrusions to engage two adjacent chain links 1 or adjacent chain links 1 and 2, thus preventing misalignment of adjacent chain links. For other common design features not mentioned above, please refer to existing technical solutions.

Claims

1. A CVT steel belt system, characterized in that it includes a plurality of chain links 1 arranged sequentially and closely fitted together, and a plurality of chain links 2 distributed at equal intervals between the chain links 1, wherein the chain links 1 and chain links 2 have highly asymmetrical saddles on both sides, the two sides of the plurality of chain links 1 and chain links 2 are connected in series by steel ring modules 1 and steel ring modules 2 respectively, and the series connection forms an annular steel belt, wherein the two sides of the chain links 2 are provided with limiting structures for constraining steel ring modules 1 or steel ring modules 2, the steel ring modules 1 and steel ring modules 2 cooperate with the corresponding saddles, and each includes a plurality of steel rings stacked vertically, the plurality of steel rings stacked vertically forming a strength-toughness gradient structure.

2. The CVT steel belt system as described in claim 1, characterized in that, The chain link includes a triangular top A, a neck A integrally connected to the middle of the bottom edge of the top A, and a trapezoidal bottom A integrally connected to the lower end of the neck A. The two side ends of the bottom A are used to cooperate with the active cone wheel or the passive cone wheel. The two shoulders of the bottom A and the top A are located between the bottom edges on both sides of the neck A to form a saddle. The relationship between the saddle height h1 on the side closer to the active cone wheel and the saddle height h2 on the other side satisfies: h1 = (110% to 130%) * h2.

3. A CVT steel belt system as described in claim 2, characterized in that, The second chain link includes a circular plate-shaped top B, a neck B integrally connected to the bottom end of the top B, and a trapezoidal bottom B integrally connected to the lower end of the neck B. The bottom B has the same structure as the bottom A, except that: the outer edge of the top of the bottom B is fixedly provided with a limiting platform to restrict the outward movement of the steel ring. The limiting platform constitutes a limiting structure and its outer surface is detached from the cone wheel.

4. A CVT steel belt system as described in claim 3, characterized in that, The neck B has groove structures on both sides, and the bottom B of the chain piece two forms a saddle structure between the two shoulders and the top of the groove structure. The height of the saddle structure on both sides is the same as that of the chain piece one. The inner surface of the limiting platform facing one end of the neck B is an inclined surface. The inclined surface is used to guide the running fluctuation of the steel ring module one or the steel ring module two.

5. A CVT steel belt system as described in claim 4, characterized in that, The steel ring module one and steel ring module two include several steel rings stacked one on top of the other. The height of the limiting platform is less than or equal to the thickness of the bottom steel ring. In the chain link two, the distance W1 between the root of the limiting platform and the neck B on the same side is equal to the width W2 of the steel ring in its natural state.

6. A CVT steel belt system as described in claim 5, characterized in that, The number of chain pieces two is a multiple of 4.

7. A CVT steel belt system as described in claim 6, characterized in that, The steel ring module one and steel ring module two are each composed of several layers of steel rings with different thicknesses, and the number of layers between the two is different. Steel ring module one is located on the saddle facing the active cone wheel and has more layers of steel rings than steel ring module two.

8. A CVT steel belt system as described in claim 7, characterized in that, In the steel ring module one and steel ring module two, the thickness of the steel ring increases layer by layer from bottom to top, the strength of the steel ring increases layer by layer from bottom to top, and the toughness decreases layer by layer from bottom to top.

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