Elliptical machine capable of freely adjusting stride
By introducing a sliding pedal seat and a dual-pedal tube linkage structure into the elliptical trainer, combined with optimized bearing connections and limit buffer design, the adaptability problem of fixed stride length in traditional elliptical trainers has been solved, enabling real-time stride length adjustment and improved motion stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ARCANA POWER HEALTH TECH LTD
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional elliptical trainers have fixed pedal movement trajectories, which cannot be adjusted in real time according to individual differences, resulting in user adaptability issues. Furthermore, the existing pedal mechanism design suffers from structural instability and uneven force distribution.
It adopts a sliding pedal seat and a dual pedal tube linkage structure, combined with an optimized bearing connection scheme, to achieve real-time dynamic adjustment of stride length, and improves movement stability through mechanical limiting and elastic buffering mechanisms.
It enables flexible adjustment of stride length and smoothness of movement trajectory, reduces the risk of sports injuries, and improves the lifespan of the equipment and user experience.
Smart Images
Figure CN224235996U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fitness equipment technology, and in particular to an elliptical machine with freely adjustable stride. Background Technology
[0002] Elliptical trainers, a common type of fitness equipment, provide low-impact aerobic exercise by simulating the motion trajectories of walking, running, or climbing stairs. In traditional elliptical trainer designs, the movement trajectory of the pedals is typically determined by a fixed mechanical structure, pre-limiting the user's stride length and preventing real-time adjustments based on individual differences (such as height and exercise habits). This design flaw leads to compatibility issues for users of different heights: shorter users are forced to overextend their hip joints, while taller users need to compensate with knee flexion, potentially causing sports injuries or discomfort with prolonged use. Furthermore, traditional elliptical trainer pedal mechanisms often use a single pedal tube design, which is prone to structural instability and uneven force distribution during exercise, affecting exercise comfort and the equipment's lifespan.
[0003] Existing technologies have attempted to address the stride adjustment problem, such as allowing manual adjustment by the user. However, this requires users to manually adjust the structure before exercise, preventing dynamic stride changes based on real-time needs during exercise, resulting in lag and a lack of flexibility. Furthermore, existing pedal mechanism designs struggle to balance exercise stability and stride adjustment functionality; either the structure is overly complex, leading to excessive costs, or the simplified structure sacrifices the exercise experience. Particularly in dual-pedal-tube linkage structures, existing technologies lack effective bearing connection solutions, resulting in asynchronous pedal tube movement and severe wear at connection points.
[0004] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention
[0005] To address the aforementioned problems, the purpose of this invention is to provide an elliptical machine with freely adjustable stride length, which has advantages such as real-time stride length adjustment, high motion stability, and strong structural durability.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] This application provides an elliptical trainer with freely adjustable stride length, the technical solution of which is as follows: It includes a frame, and a pedal mechanism and two sets of rocker mechanisms mounted on the frame; the frame includes a base and a column; the pedal mechanism includes a crank assembly rotatably mounted on the base, rollers mounted on the two crank ends of the crank assembly, and two pedal seats with arc-shaped tracks at their lower ends; the two pedal seats are respectively located on both sides of the frame, and their arc-shaped tracks are mounted on the rollers on the same side, and can slide back and forth relative to the rollers; the two sets of rocker mechanisms are respectively mounted on both sides of the frame, each rocker mechanism including a swing arm and a pedal tube assembly; the swing arm is rotatably mounted on the column, the front end of the pedal tube assembly is hinged to the lower end of the swing arm, and the rear end is hinged to the pedal seat.
[0008] The frame provides an overall support structure, with the base and upright forming the basic framework. In the pedal mechanism, the crank assembly transmits power, and the rollers, in conjunction with the curved track, allow the pedal seat to slide back and forth—the core structure for stride adjustment. Two rocker mechanisms, through the hinged design of the rocker arm and pedal tube assembly, link pedal movement with upper limb swing while maintaining pedal sliding freedom. These features together constitute a dynamic adjustment system. When the user applies different amounts of force, the pedal seat slides along the curved track to change stride length, achieving real-time adjustment during movement. Specifically, during normal pedaling, the user can freely control their stride length according to their stride size. At different stride lengths, the angle of the pedal changes with the curvature of the track, resulting in a more natural pedaling experience.
[0009] Furthermore, this application proposes that limit blocks be provided at the front and rear ends of the arc-shaped track to limit the sliding range of the pedal seat. The limit blocks at the front and rear ends of the arc-shaped track physically constrain the sliding displacement of the pedal seat on the arc-shaped track, preventing deviation of the movement trajectory or the risk of the pedal seat derailing due to excessive sliding. This structure achieves controllability of the movement range through mechanical limiting, ensuring that the user's stride is always within the designed safe range.
[0010] Furthermore, this application proposes that the front and rear ends of the arc-shaped track are connected to baffles extending radially therein, and elastic buffering limit blocks are provided on the inner side of the baffles to reduce the impact force during movement. The radially extending baffles at both ends of the arc-shaped track physically restrict the range of motion of the rollers; the elastic buffering limit blocks on the inner side of the baffles absorb impact energy through material deformation. The two work synergistically: the baffles provide a rigid limiting base, and the elastic buffer blocks reduce rigid collisions through deformation energy dissipation, jointly achieving a stepped attenuation of the impact force. This solution, through a dual limiting mechanism combining rigidity and flexibility, effectively buffers the end-point impact while ensuring the stability of the pedal seat's sliding trajectory.
[0011] Furthermore, this application proposes that the arc-shaped track is recessed inward to form a track groove, and side plates are provided on both sides of the track groove; the rolling surface of the roller is embedded in the track groove. The arc-shaped track, by forming a track groove through inward recess, provides a precise rolling path for the roller; the side plates provided on both sides of the track groove can prevent the roller from derailing laterally; the design of the roller's rolling surface being embedded in the track groove achieves a physical constraint fit between the rolling surface and the track groove. This solution, through the combination structure of the track groove and side plates, mechanically restricts the movement trajectory of the roller, effectively improving the stability during movement and avoiding the slippage risk that may occur with traditional planar tracks.
[0012] Furthermore, this application proposes that the pedal assembly includes a first pedal and a second pedal. The front ends of the first and second pedals are hinged to the connecting seat at the lower end of the swing arm via a front bearing assembly or a front axle sleeve assembly, and the rear ends are hinged to the pedal seat via a rear bearing assembly or a rear axle sleeve assembly, forming a dual-pedal-tube linkage structure. This dual-pedal-tube linkage structure forms a closed-loop force transmission path through the double hinges at the front and rear ends. The front bearing assembly converts the swing of the swing arm into linear motion of the pedals, and the rear bearing assembly transmits the thrust of the pedals to the pedal seat. This symmetrically distributed structural design effectively disperses the impact force of movement, avoids component deformation caused by single-point force, and ultimately achieves a smoother stride output.
[0013] Furthermore, this application proposes that the connecting seat includes two side plates, and the front ends of the first and second pedal tubes are provided with front cylinders; the front bearing assembly includes a front axle and a bearing sleeved on the front axle; the front axle sleeve assembly includes a front axle and a bushing sleeved on the front axle; the front axle and the bearing or bushing on it pass through the inside of the front cylinder, and the two ends of the front axle are connected to the two side plates. The two side plates of the connecting seat provide a symmetrical support structure to ensure the balance of force transmission; the integrated design of the front cylinder and pedal tube realizes the continuity of the force transmission path; the through-type connection of the front axle with the bearing assembly ensures both rotational freedom and controls radial displacement; the bearing sleeve structure reduces friction loss. These features together construct an articulated node that can withstand bidirectional alternating loads, effectively suppressing lateral movement during movement while maintaining the pedal tube's swing flexibility.
[0014] Furthermore, two rear axle rods are fixedly connected to the outer side of the pedal seat, and a rear cylinder is provided at the rear end of the first and second pedal tubes; the rear cylinders of the first and second pedal tubes are rolled onto the rear axle rods through a rear bearing assembly or a rear axle sleeve assembly. The two rear axle rods fixed to the outer side of the pedal seat provide rotational support; the rear cylinder at the rear end of the pedal tube assembly mates with the rear axle rods; the rear bearing assembly achieves rolling engagement, reducing friction. These features work together to: the rear axle rods and the rear cylinder form a rigid connection base; the rear bearing assembly allows the pedal tubes to rotate freely around the axle rods while bearing radial loads. This structure, through a separate axle rod design, avoids pedal tube movement interference, ensures stability during synchronous linkage of the two pedal tubes, and reduces movement resistance through rolling friction.
[0015] Furthermore, this application proposes that the base frame has an upward protrusion in its middle section, and the crank assembly is mounted on this protrusion. As the basic support component of the elliptical machine, the upward protrusion in the middle of the base frame forms a locally reinforced structural area. This protrusion increases the vertical geometric height of the base frame, providing a higher mounting platform for the crank assembly. The crank assembly is directly mounted on the protrusion, which relatively raises the crank's rotation axis, resulting in two technical effects: firstly, it enhances the connection rigidity between the crank assembly and the base frame, reducing vibration transmission during movement; secondly, it optimizes the kinematic coordination between the pedal mechanism and the rocker arm mechanism, improving the force transmission path through the raised rotation center. The coordination between the protrusion structure and the crank assembly constitutes a spatial position optimization scheme, achieving improved motion stability through topological improvements in the mechanical structure without adding additional adjustment mechanisms.
[0016] As can be seen from the above, the elliptical machine provided in this application, which has a real-time stride control and a dual-pedal linkage structure, achieves real-time dynamic adjustment of stride through the cooperation of a sliding pedal seat and a dual-pedal linkage structure. At the same time, it adopts an optimized bearing connection scheme to improve motion stability, and has the advantages of flexible stride adjustment, smooth motion trajectory, and strong structural durability. Attached Figure Description
[0017] Figure 1 This is an exploded view of the structure of an elliptical machine provided in this application.
[0018] Figure 2 The present application provides a schematic diagram of the cooperation between the arc track and the roller.
[0019] Figure 3 This is a side view of the rocker mechanism of an elliptical machine in its normal state, as provided in this application.
[0020] Figure 4 This is a side view of the rocker mechanism of an elliptical machine in the forward swing state, as provided in this application.
[0021] Figure 5 This is a side view of the rocker mechanism of an elliptical machine in its backward swing state, as provided in this application. Detailed Implementation
[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.
[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0027] like Figure 1-5 As shown, this embodiment relates to an elliptical trainer with freely adjustable stride length, including a frame, a pedal mechanism, and two sets of rocker mechanisms mounted on the frame. The frame includes a base frame 1 and a column 2. The pedal mechanism includes a crank assembly 3 rotatably mounted on the base frame 1, rollers 4 mounted on the ends of two cranks 3-1 of the crank assembly 3, and two pedal seats 5 with arc-shaped tracks 5-1 at their lower ends. The two pedal seats 5 are located on both sides of the frame, and their arc-shaped tracks 5-1 are mounted on the rollers 4 on the same side, allowing them to slide back and forth relative to the rollers 4. The two sets of rocker mechanisms are respectively mounted on both sides of the frame, each rocker mechanism including a swing arm 6 and a pedal tube assembly. The swing arm 6 is rotatably mounted on the column 2, and the front end of the pedal tube assembly is hinged to the lower end of the swing arm 6, while the rear end is hinged to the pedal seat 5. Specifically, this technical solution achieves real-time stride adjustment in the following way: when the user applies different pedaling forces, the arc-shaped track 5-1 on the pedal seat 5 slides relative to the roller 4 on the crank 3-1, thereby changing the effective working length of the pedal tube assembly and adjusting the swing amplitude of the swing arm 6. The cooperation between the roller 4 and the arc-shaped track 5-1 ensures both sliding freedom and maintains motion stability through the arc-shaped trajectory constraint. The rotational motion of the crank assembly 3 and the sliding motion of the pedal seat 5 are coupled, allowing for a smooth transition in stride changes. Compared with existing technologies, this solution eliminates the need for a manual adjustment mechanism, achieving real-time stride adjustment during exercise through the adaptive characteristics of the mechanical structure, effectively solving the adaptability problem of fixed stride length in traditional elliptical machines.
[0028] Furthermore, an upward protrusion 1-1 is constructed in the middle of the base frame 1, and the crank assembly 3 is mounted on the protrusion 1-1 of the base frame 1. The protrusion 1-1 structure can be achieved by stamping, welding reinforcing ribs, or casting. Reinforcing ribs can be provided on the sidewall of the protrusion 1-1 to improve torsional stiffness. In another embodiment, the protrusion 1-1 and the base frame 1 are integrally molded, and its cross-section is trapezoidal or arc-shaped. This technical solution forms a rigid support platform by partially raising the middle of the base frame 1, thereby raising the rotation center of the crank assembly 3 relative to the traditional flat base frame. Specifically, the protrusion 1-1 structure increases the vertical stiffness of the crank 3-1 mounting point, effectively suppressing the lateral vibration generated when the crank 3-1 rotates. At the same time, the raised rotation axis optimizes the force transmission angle between the pedal seat 5 and the rocker arm mechanism, making the motion trajectory of the hinge point of the pedal tube assembly closer to an ideal ellipse. Thus, without adding a complex adjustment mechanism, a significant improvement in motion stability is achieved through the spatial reconstruction of the mechanical structure.
[0029] Furthermore, limit blocks 5-2 are respectively provided at the front and rear ends of the curved track 5-1 to limit the sliding range of the pedal seat 5. Specifically, the limit blocks 5-2 can be made of metal stamping or engineering plastic injection molding, and their cross-sectional shape matches the contour of the curved track 5-1. They are fixed to the end of the track by bolts or welding. As a preferred embodiment, a rubber buffer layer with a thickness of 3-5mm can be added to the working surface of the limit blocks 5-2 to reduce impact noise. Furthermore, the installation position of the limit blocks 5-2 is set according to ergonomic data. For example, the front limit block 5-2 is 120-150mm from the starting point of the track, and the rear limit block 5-2 is 100-120mm from the end point of the track. This spacing range has been tested and can cover 95% of the natural stride of adult users.
[0030] Therefore, this technical solution precisely constrains the displacement range of the pedal seat 5 through mechanical limiting. The symmetrical arrangement of rigid limiting blocks 5-2 forms a bidirectional barrier, ensuring that the sliding range of the pedal seat 5 on the arc-shaped track 5-1 is always within the designed safety threshold. Compared with existing technologies, this structure does not rely on electronic sensors or complex adjustment mechanisms, directly eliminating the risk of slippage through physical interception and ensuring the stability of the motion trajectory. In continuous operation, the elliptical machine using this design exhibits controllable trajectory offset of the pedal seat 5, effectively solving the problem of unstable motion caused by uncontrollable slippage.
[0031] In such Figure 1In the specific implementation shown, baffles 5-4 extending radially are connected to the front and rear ends of the arc-shaped track 5-1. An elastically cushioned limiting block 5-2 is provided on the inner side of the baffle 5-4 to reduce impact during movement. The baffle 5-4 extends radially along the arc-shaped track 5-1, and its extension length can be adjusted according to actual needs. The baffle 5-4 can be made of stamped metal sheet and is fixed to the arc-shaped track 5-1 by welding, bolting, or integral molding. The elastically cushioned limiting block 5-2 is made of rubber, polyurethane, or silicone material and can be fixed to the inner side of the baffle 5-4 by adhesive, snap-fit, or bolts. As a preferred embodiment, the limiting block 5-2 is designed as a replaceable structure for easy replacement based on wear and tear. This technical solution, through the combined design of the baffle 5-4 and the elastically cushioned limiting block 5-2, achieves precise control of the sliding range of the pedal seat 5 and effective cushioning of impact. The baffle 5-4 provides rigid limiting, ensuring that the pedal seat 5 does not deviate from the predetermined movement trajectory. The elastic buffer limit block 5-2 absorbs impact energy through material deformation, reducing rigid collisions at the end of the movement. The two work together to form a dual-limiting mechanism combining rigidity and flexibility, significantly reducing impact force transmission while ensuring motion stability. Compared to existing technologies, this solution achieves step-by-step attenuation of impact force without complex adjustment mechanisms, and its structure is simple, reliable, and has low maintenance costs. Specifically, when the roller 4 moves to the end of the track, it first contacts the elastic buffer limit block 5-2, absorbing part of the kinetic energy through material compression deformation. The remaining impact force is then rigidly received by the baffle 5-4, thus achieving phased dissipation of the impact force. This avoids the instantaneous impact problem caused by purely rigid limiting and overcomes the insufficient positioning accuracy that may result from purely elastic buffering.
[0032] like Figure 2As shown, the arc-shaped track 5-1 is recessed inward to form a track groove 5-6, and side plates 5-7 are provided on both sides of the track groove 5-6. The rolling surface of the roller 4 is embedded in the track groove 5-6. The recess depth of the track groove 5-6 can be designed according to the diameter of the roller 4 to ensure that the rolling surface keeps in contact with the bottom of the groove without generating excessive friction. The height of the side plate 5-7 is preferably 1.2-1.5 times the thickness of the roller 4, and can be made of metal stamping or injection molding of engineering plastic. As a preferred embodiment, a wear-resistant coating, such as polyurethane or Teflon material, can be added to the inner side of the side plate 5-7 to reduce wear caused by long-term friction. This technical solution, through the double limiting structure of the track groove 5-6 and the side plate 5-7, mechanically constrains the movement trajectory of the roller 4. Specifically, the track groove 5-6 provides precise axial guidance for the roller 4, preventing swaying during forward and backward sliding. The two side plates 5-7 form a lateral physical barrier, effectively blocking the lateral displacement of the roller 4 under the action of centrifugal force. The resulting synergistic effect strictly limits the movement trajectory of roller 4 on the curved track 5-1, overcoming the slippage risk inherent in traditional planar tracks. Compared with existing technologies, this design significantly improves motion stability through geometric constraints while maintaining structural simplicity, making it particularly suitable for elliptical machine pedal mechanisms that require frequent direction changes.
[0033] like Figure 1 As shown in Figure 3-5, the pedal assembly includes a first pedal tube 7 and a second pedal tube 8. The front ends of the first pedal tube 7 and the second pedal tube 8 are hinged to the connecting seat 9 at the lower end of the swing arm 6 via a front bearing assembly or a front bushing assembly, and the rear ends are hinged to the pedal seat 5 via a rear bearing assembly 8-1 or a rear bushing assembly 8-3, forming a dual-pedal tube linkage structure. In a preferred embodiment, both the front bearing assembly and the rear bearing assembly 8-1 can be needle roller bearings or deep groove ball bearings to reduce friction loss. The dual-pedal tube linkage structure, through the parallel arrangement of the first pedal tube 7 and the second pedal tube 8, enables the pedal assembly to form a stable force-bearing frame. The front bearing assembly enables synchronous swinging of the pedal tube and the swing arm 6, while the rear bearing assembly 8-1 ensures coordinated movement of the pedal tube and the pedal seat 5. This design reduces stress concentration in a single pedal tube by distributing the load between the two pedal tubes, while simultaneously enhancing the rigid constraints in the forward and backward movement directions, thereby improving the stability of the pedal's movement trajectory. Compared with existing technologies, the dual-pedal tube linkage structure forms a closed-loop force transmission path through double hinges at the front and rear ends. The front bearing assembly converts the swing of the swing arm 6 into the linear motion of the pedal tube, while the rear bearing assembly 8-1 transmits the thrust of the pedal tube to the pedal seat 5. This symmetrically distributed structural design effectively disperses the impact force of movement, avoids component deformation caused by single-point force, and ultimately achieves a more stable stride output.
[0034] In a further embodiment, the connecting seat 9 includes two side plates 9-1, and the front ends of the first pedal tube 7 and the second pedal tube 8 are provided with a front cylinder 7-2; the front bearing assembly includes a front axle 7-3 and a bearing 7-4 sleeved on the front axle 7-3; the front bushing assembly includes a front axle 7-3 and a bushing 7-5 sleeved on the front axle 7-3; the front axle 7-3 and the bearing 7-4 or bushing 7-5 on it pass through the inner side of the front cylinder 7-2, and both ends of the front axle 7-3 are connected to the two side plates 9-1. Specifically, the front cylinder 7-2 and the pedal tube can be structurally integrated by integral molding or separate welding, and its inner diameter needs to form a transition fit with the outer diameter of the bearing 7-4 on the front axle 7-3. As a preferred embodiment, the bearing 7-4 can be a deep groove ball bearing or an angular contact bearing, wherein the deep groove ball bearing is suitable for working conditions where radial load is the main component, while the angular contact bearing is more suitable for bearing composite loads. The shaft holes on the side plate 9-1 need to be precision machined to ensure the fitting accuracy with the front axle 7-3. The two ends of the front axle 7-3 can be axially fixed by threaded fastening or retaining springs. Thus, this technical solution constructs a stable force transmission frame through the symmetrically distributed side plates 9-1, and the through-fitting front cylinder 7-2 and front axle 7-3 forms the core structure of a rotating pair. The bearing assembly 7-4 allows for low-friction rotation of the pedal tube during oscillation, while the double-sided fixation of the front axle 7-3 effectively suppresses radial displacement during movement. Compared with existing single-point hinge structures, this design significantly improves the load-bearing stability of the hinge node, maintaining the accuracy of the motion trajectory even under bidirectional alternating loads. Through the integrated design of the front cylinder 7-2 and the pedal tube, the force transmission path is more continuous, avoiding the stress concentration problem present in traditional split connections.
[0035] Furthermore, two rear axle rods 5-8 are fixedly connected to the outer side of the pedal seat 5, and a rear cylinder 8-2 is provided at the rear end of the first pedal tube 7 and the second pedal tube 8; the rear cylinder 8-2 of the first pedal tube 7 and the second pedal tube 8 are rolledly sleeved on the rear axle rod 5-8 through the rear bearing assembly 8-1 or the rear axle sleeve assembly 8-3.
[0036] Specifically, the rear axle 5-8 is made of medium carbon alloy steel, with a surface hardened to improve wear resistance. It is fixed to the pedal seat 5 through interference fit or welding. The rear bearing assembly 8-1 includes two sets of angular contact ball bearings. The outer ring of the bearing is fitted with the rear cylinder 8-2, and the inner ring is fitted with the rear axle 5-8. The bearing spacing is set as needed to form a stable support span. As a preferred embodiment, the rear bearing assembly 8-1 can be replaced with a needle roller bearing or a sliding bearing, wherein the sliding bearing is made of polytetrafluoroethylene composite material. An anti-disengagement snap ring is provided at the end of the rear axle 5-8, and a sealing ring is installed at the opening of the rear cylinder 8-2 to prevent dust intrusion. Thus, this technical solution supports the rear cylinders 8-2 of the two pedal tubes respectively through two independent rear axle 5-8, forming a stable double-support hinge structure between the pedal tube assembly and the pedal seat 5. The rear bearing assembly 8-1 converts sliding friction into rolling friction, allowing the pedal tube to maintain flexible rotation when bearing the radial load generated by the user's weight. The split shaft design avoids mutual interference during the movement of the two pedal tubes, ensuring the stability of the synchronous movement of the left and right pedal tubes.
[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.
Claims
1. An elliptical trainer with freely adjustable stride, comprising a frame, a pedal mechanism and two sets of rocker mechanisms mounted on the frame; the frame comprising a base (1) and a column (2); characterized in that: The pedal mechanism includes a crank assembly (3) rotatably mounted on a base frame (1), the crank assembly (3) comprising a pair of cranks (3-1), the ends of the cranks (3-1) being provided with rollers (4); The pedal mechanism also includes two pedal seats (5), and an arc-shaped track (5-1) is provided at the lower end of the pedal seat (5). The arc-shaped track (5-1) is mounted on the roller (4) on the same side and can slide back and forth relative to the roller (4). The two sets of rocker mechanisms are respectively set on both sides of the frame. Each set of rocker mechanisms includes a rocker arm (6) and a pedal tube assembly. The rocker arm (6) is rotatably set on the column (2). The front end of the pedal tube assembly is hinged to the lower end of the rocker arm (6), and the rear end is hinged to the pedal seat (5).
2. An elliptical trainer with freely adjustable stride according to claim 1, characterized in that: Limiting blocks (5-2) are respectively provided at the front and rear ends of the arc-shaped track (5-1) to limit the sliding range of the pedal seat (5).
3. An elliptical trainer with freely adjustable stride according to claim 1, characterized in that: The front and rear ends of the arc-shaped track (5-1) are connected to baffles (5-4) extending in the radial direction. The inner side of the baffles (5-4) is provided with elastic buffer limit blocks (5-2) to reduce the impact force during the movement.
4. An elliptical trainer with freely adjustable stride according to claim 1, characterized in that: The arc-shaped track (5-1) is recessed inward to form a track groove (5-6), and side plates (5-7) are provided on both sides of the track groove (5-6); the rolling surface of the roller (4) is embedded in the track groove (5-6).
5. An elliptical trainer with freely adjustable stride according to claim 1, characterized in that: The pedal assembly includes a first pedal (7) and a second pedal (8). The front ends of the first pedal (7) and the second pedal (8) are hinged to the connecting seat (9) at the lower end of the swing arm (6) through a front bearing assembly or a front bushing assembly, and the rear ends are hinged to the pedal seat (5) through a rear bearing assembly (8-1) or a rear bushing assembly (8-3), forming a double pedal linkage structure.
6. An elliptical trainer with freely adjustable stride according to claim 5, characterized in that: The connecting seat (9) includes two side plates (9-1), and the front ends of the first pedal tube (7) and the second pedal tube (8) are provided with front cylinders (7-2); the front bearing assembly includes a front axle (7-3) and a bearing (7-4) sleeved on the front axle (7-3); the front bushing assembly includes a front axle (7-3) and a bushing (7-5) sleeved on the front axle (7-3); The front axle (7-3) and its bearing (7-4) or bushing (7-5) are inserted inside the front cylinder (7-2), and the two ends of the front axle (7-3) are connected to the two side plates (9-1).
7. An elliptical trainer with freely adjustable stride according to claim 5, characterized in that: Two rear axle rods (5-8) are fixed to the outside of the pedal seat (5). The rear ends of the first pedal tube (7) and the second pedal tube (8) are provided with rear cylinders (8-2). The rear cylinders (8-2) of the first pedal tube (7) and the second pedal tube (8) are rolled onto the rear axle rods (5-8) through a rear bearing assembly (8-1) or a rear axle sleeve assembly (8-3).
8. An elliptical trainer with freely adjustable stride according to claim 1, characterized in that: The base frame (1) has an upward protrusion (1-1) in the middle, and the crank assembly (3) is disposed on the protrusion (1-1) of the base frame (1).