Rubber-coated rollers for treadmills

Abstract

This utility model belongs to the technical field of fitness equipment and discloses a rubber-coated roller for treadmills, including a spindle with an elastic rubber coating layer covering its outer periphery; the elastic rubber coating layer includes at least one layer of elastic material. This utility model improves the overall shock absorption effect and reduces noise during use by coating the outer periphery of the spindle with an elastic rubber coating layer, making the usage environment more suitable.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment technology, specifically to a rubber-coated roller for a treadmill. Background Technology

[0002] Treadmills are a widely used type of indoor fitness equipment, and one of their core components is the roller that drives the running belt. Traditional treadmill rollers are mostly made of metal with electroplating or spraying finishes. While metal rollers are strong, they generate significant noise when rubbing and impacting the back of the running belt. Furthermore, the high hardness of metal makes it difficult to effectively absorb the impact and vibration generated when runners step on the running belt, resulting in a harsh running experience and potentially causing joint discomfort with prolonged use. Utility Model Content

[0003] To solve the above-mentioned technical problems, a rubber-coated roller for treadmills is provided.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rubber-coated roller for a treadmill, including a spindle, wherein the outer periphery of the spindle is covered with an elastic rubber coating layer; the elastic rubber coating layer includes at least one layer of elastic material.

[0005] According to this utility model, the outer circumferential surface of the mandrel is provided with a groove; the surface of the elastic coating layer that contacts the groove is provided with a protrusion structure that matches the shape of the groove and is embedded therein.

[0006] According to this utility model, the elastic coating layer further includes an inner layer and an outer layer; the inner layer is fixedly connected to the spindle for shock absorption and cushioning; the outer layer covers the outer surface of the inner layer for frictional contact with the running belt.

[0007] According to this utility model, the inner layer is made of rubber or polyurethane with a Shore A hardness of 60-80, and the outer layer is made of polyurethane or wear-resistant rubber composite material with a Shore A hardness of 85-95.

[0008] According to this utility model, a transition layer is provided between the inner layer and the outer layer, and the material hardness of the transition layer is between that of the inner layer and the outer layer, so as to achieve a gradient transition in hardness.

[0009] According to this utility model, the cross-sectional shape of the groove is trapezoidal, rectangular, dovetail-shaped, or semi-circular.

[0010] According to this utility model, the outer surface of the mandrel is further subjected to sandblasting roughening treatment and / or coated with an adhesive layer.

[0011] According to this utility model, the material of the elastic coating layer is thermoplastic polyurethane elastomer, rubber, or a highly elastic composite material.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This invention features an elastic rubber coating around the outer periphery of the spindle, which improves the overall shock absorption effect, reduces noise during use, and makes the operating environment more suitable.

[0014] The mandrel surface of this invention is provided with grooves, which form a mechanical interlocking structure with the raised structure of the elastic coating layer, thereby improving the bonding strength between the elastic coating layer and the mandrel and effectively preventing relative sliding and detachment under long-term high-speed operation.

[0015] The inner layer of this invention is made of highly elastic material that can effectively absorb impact and vibration, significantly reducing noise when the running belt comes into contact with the roller, providing a quieter and more comfortable running experience, and reducing the impact on the user's joints; the outer layer provides a higher coefficient of friction, ensuring sufficient and stable grip with the running belt, preventing slippage, and resulting in higher transmission efficiency and smoother and safer operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the rubber-coated roller for a treadmill according to the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along direction A;

[0018] Figure 3 for Figure 1 A magnified view of part B.

[0019] Reference numerals: 10-mandrel, 101-groove, 20-elastic coating layer, 201-protruding structure, 202-inner layer, 203-outer layer. Detailed Implementation

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] like Figures 1 to 3As shown in the illustration, this application discloses a rubber-coated roller for a treadmill, including a spindle 10 and an elastic rubber coating 20 covering the outer periphery of the spindle 10. Multiple evenly distributed grooves 101 are provided on the outer circumferential surface of the spindle 10. Correspondingly, the surface of the elastic rubber coating 20 that contacts the spindle 10 has protrusions 201 that match the shape of the grooves 101. The protrusions 201 are embedded in the grooves 101, achieving a connection and fixation between the elastic rubber coating 20 and the spindle 10. The outer circumferential surface of the elastic rubber coating 20 is a smooth cylindrical surface for contact with the running belt. Optionally, the cross-sectional shape of the grooves 101 is trapezoidal, rectangular, dovetail-shaped, or semi-circular.

[0022] Specifically, the mandrel 10 is made of high-strength steel or aluminum alloy, and multiple parallel axial grooves are machined on its outer circumferential surface; alternatively, annular grooves or both axial and annular grooves can be machined simultaneously.

[0023] Before the overmolding process, the mandrel 10 with the pre-machined grooves is sandblasted to roughen its surface, thereby increasing the surface area and bonding strength. Subsequently, it is cleaned and coated with a special metal-rubber adhesive.

[0024] Next, the prepared mandrel 10 is placed into the mold, and thermoplastic polyurethane (TPU) material is injected into the mold cavity using injection molding, casting molding, or compression molding processes. Under pressure, the TPU material fills the mold and tightly wraps the mandrel 10, while flowing into all the grooves 101. After cooling and solidification, the finished product is demolded.

[0025] The molded elastic coating layer 20 completely covers the mandrel 10, and its protruding structure 201 fits into the groove 101 to form a solid whole.

[0026] In this embodiment, the axially arranged groove 101 has a trapezoidal cross-section. This makes the opening of the groove smaller than the bottom, forming an inverted structure. When the overlay material is filled in, it can generate a very strong mechanical locking force, preventing the elastic overlay layer 20 from moving along the axial and circumferential directions of the mandrel 10.

[0027] In this embodiment, the elastic overlay layer 20 is made of thermoplastic polyurethane elastomer (TPU), rubber, or a highly elastic composite material. The thickness of the elastic overlay layer 20 is 5-12 mm.

[0028] In this embodiment, the elastic coating layer 20 can be a multi-layer structure formed by multi-layer co-extrusion or step-by-step molding.

[0029] Specifically, the elastic coating layer 20 includes an inner layer 202 and an outer layer 203 disposed on its outer surface. A raised structure 201 is disposed on the inner surface of the inner layer 202 and engages with and is fixed to the groove 101 of the spindle 10. Preferably, the inner layer 202 is made of a material with low Shore A hardness and good elasticity, such as natural rubber or soft polyurethane, to absorb and attenuate most of the vibration and impact from the running belt, improving the noise reduction effect during exercise.

[0030] The outer layer 203 completely covers the outer surface of the inner layer 202, and the outer circumferential surface of the outer layer 203 is a smooth cylindrical surface. The outer layer 203 is made of a material with high Shore A hardness, wear resistance, tear resistance and stable coefficient of friction, such as high-performance thermoplastic polyurethane (TPU), to provide durable and stable friction to drive the running belt and resist wear and tear, extending the overall service life of the roller.

[0031] Furthermore, in order to improve the bonding force between the inner layer 202 and the outer layer 203, a transition layer (not shown in the figure) can be added between the two layers. The material hardness of the transition layer is between that of the inner layer and the outer layer, forming a gradient change in hardness, which can effectively reduce stress concentration and prevent delamination under long-term high load operation.

[0032] The elastic rubber coating structure of this utility model, which is soft on the inside and hard on the outside, has the effects of shock absorption, noise reduction, wear resistance and anti-slip. It can improve the shock absorption and quietness through the inner layer 202, and improve the service life of the roller through the wear-resistant material of the outer layer 203.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rubber-coated roller for a treadmill, including a spindle, characterized in that: The outer periphery of the mandrel is covered with an elastic rubber layer; the elastic rubber layer includes at least one layer of elastic material; a groove is provided on the outer circumferential surface of the mandrel; the surface of the elastic rubber layer that contacts the groove has a protrusion structure that matches the shape of the groove and is embedded therein; the elastic rubber layer includes an inner layer and an outer layer; the inner layer is fixedly connected to the mandrel for shock absorption and cushioning; the outer layer covers the outer surface of the inner layer for frictional contact with the running belt.

2. The rubber-coated roller for a treadmill as described in claim 1, characterized in that: The inner layer is made of rubber or polyurethane with a Shore A hardness of 60-80, and the outer layer is made of polyurethane or wear-resistant rubber composite material with a Shore A hardness of 85-95.

3. The rubber-coated roller for a treadmill according to claim 1, characterized in that: A transition layer is provided between the inner layer and the outer layer, and the material hardness of the transition layer is between that of the inner layer and the outer layer to achieve a gradient transition in hardness.

4. The rubber-coated roller for a treadmill as described in claim 1, characterized in that: The cross-sectional shape of the groove is trapezoidal, rectangular, dovetail-shaped, or semi-circular.

5. The rubber-coated roller for a treadmill as described in claim 1, characterized in that: The outer surface of the mandrel is roughened by sandblasting and / or coated with an adhesive layer.

6. The rubber-coated roller for a treadmill as described in claim 1, characterized in that: The material of the elastic coating layer is thermoplastic polyurethane elastomer, rubber, or highly elastic composite material.

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