A compound telescopic lifting mechanism suitable for high-lift treadmills

Abstract

The application discloses a composite telescopic lifting mechanism suitable for a high-lifting treadmill, and a multistage telescopic sleeve assembly comprises a transmission screw rod, at least one threaded sleeve and an outer sleeve. The proximal end of the transmission screw rod is rotatably installed in a module base, a first transmission nut is engaged on the transmission screw rod, and the proximal end of the threaded sleeve is nested on the first transmission nut. The outer periphery of the threaded sleeve is threadedly engaged with a second transmission nut, the proximal end of the outer sleeve is nested on the second transmission nut, and the outer sleeve is coaxially sleeved outside the threaded sleeve. The three-stage nested telescopic driving structure is suitable for the lifting working condition of the treadmill, and the three-stage telescopic structure formed by the transmission screw rod, the threaded sleeve and the outer sleeve can realize a working stroke which is approximately twice that of a traditional single-stage push rod under the condition of the same installation distance, and effectively solves the technical problem that the installation space and the stroke performance of the traditional lifting mechanism are restricted by each other.

Description

Technical Field

[0001] This invention belongs to the field of motor transmission structure technology, and relates to a composite telescopic lifting mechanism adapted to a high-lift treadmill. Background Technology

[0002] The lifting mechanism of a treadmill is used to adjust the incline angle of the running platform, simulating an uphill training scenario to enhance exercise intensity and training diversity. With the upgrading of home fitness needs, steep incline lifting has become a core feature of mid-to-high-end treadmills; at the same time, treadmills are developing towards thinner and more compact designs, continuously reducing the internal installation space of the base, which places higher demands on the installation dimensions and stroke performance of the lifting drive mechanism.

[0003] Current treadmill lift drives generally use a single-stage lead screw electric actuator structure. Its working stroke is close to its retracted length. To achieve the long stroke required for large-angle lifts, the axial installation distance of the actuator must be increased accordingly, directly contradicting the limited internal space of the treadmill base. Some solutions use a two-stage telescopic structure, which improves the telescopic ratio to some extent, but the stroke gain is limited and still cannot meet the large stroke requirements for high lift angles within conventional installation dimensions. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A composite telescopic lifting mechanism adapted to a high-lift treadmill includes: a module base and a drive motor, a multi-stage telescopic sleeve assembly, and a transmission assembly mounted on the module base;

[0006] The drive motor and the multi-stage telescopic sleeve assembly are connected by a transmission component;

[0007] The multi-stage telescopic sleeve assembly includes: a drive screw, at least one threaded sleeve, and an outer sleeve; the proximal end of the drive screw is rotatably mounted in the module base and engages with the drive assembly for transmission.

[0008] A first transmission nut is engaged on the transmission screw, and the near end of the threaded sleeve is nested on the first transmission nut; a first limiting structure is provided at the end of the transmission screw;

[0009] The outer circumference of the threaded sleeve is threaded with a second transmission nut, and the proximal end of the outer sleeve is nested on the second transmission nut; the outer sleeve is coaxially sleeved outside the threaded sleeve; a second limiting structure is provided at the end position of the threaded sleeve.

[0010] As a further aspect of the present invention: the transmission assembly includes: a drive gear set, a transmission gear set, and a driven gear set;

[0011] The drive motor is installed at the lower end of the module base, and the output shaft of the drive motor extends vertically upward into the module base; the drive gear set is fixed to the output shaft of the drive motor.

[0012] The driven gear set is fixed at the near end of the transmission screw; the transmission gear set is located between the driving gear set and the driven gear set, and meshes with the driving gear set and the driven gear set respectively.

[0013] As a further aspect of the present invention: the module base is also provided with a control component for realizing stroke drive control, the control component including: a synchronous gear set, a stroke cam, a rotary potentiometer and a micro switch;

[0014] The synchronous gear set is engaged with the transmission component; and the stroke cam and rotary potentiometer are coaxially and synchronously set with the synchronous gear set, rotating together with the synchronous gear set.

[0015] The micro switch is fixedly installed in the module base at the position corresponding to the stroke cam.

[0016] As a further aspect of the present invention: the control component includes: at least two sets of stroke cams and two micro switches; both stroke cams rotate synchronously with the synchronous gear set on the same axis and are staggered in phase.

[0017] As a further aspect of the present invention: a connecting bearing is provided at the assembly position of the transmission screw and the module base, and the transmission screw is rotatably assembled in the module base through the connecting bearing.

[0018] As a further aspect of the present invention: both the first limiting structure and the second limiting structure are limiting nut structures, which are respectively fixed to the ends of the transmission screw and the threaded sleeve; the outer diameter of the first limiting structure is larger than the inner diameter of the first transmission nut, and the outer diameter of the second limiting structure is larger than the inner diameter of the second transmission nut.

[0019] As a further aspect of the present invention: the first transmission nut adopts a T-shaped stepped structure, including: a nut end and a flange end; the lower end face of its flange end abuts against the near end face of the threaded sleeve;

[0020] The second transmission nut adopts a sleeve-shaped structure, with its upper end face abutting against the inner top end face of the outer sleeve; a limiting baffle is formed on the outer sleeve, and the lower end of the second transmission nut abuts against the limiting baffle.

[0021] The beneficial effects of this invention are as follows: The three-stage nested telescopic drive structure for treadmill lifting operations employs a three-section telescopic framework consisting of a transmission screw, a threaded sleeve, and an outer sleeve. In the retracted state, each stage of the structure is stacked and stored axially, achieving approximately twice the working stroke of a traditional single-stage push rod under the same installation distance. This effectively solves the technical problem of the mutual constraint between installation space and stroke performance in traditional lifting mechanisms, adapting to the limited internal installation space of treadmill bases and meeting the large stroke adjustment requirements of current mainstream high-lift angle treadmills.

[0022] This structure achieves progressive transmission through a two-stage threaded pair, resulting in uniform load distribution and no impact or jamming during operation. The lifting and adjustment process is low-noise, and it can stably bear the load of the running platform and the human body, making it suitable for the high-frequency start-stop operation of home treadmills. At the same time, the stroke control component is integrated inside the module base, and the endpoint limit and full stroke position feedback are achieved through synchronously linked stroke cams and rotary potentiometers. The detection element does not need to move with the extension and retraction of the sleeve, which has strong dust and dirt resistance and stable long-term operating accuracy. Combined with the overall modular integrated design, it effectively improves the operational reliability and service life of the mechanism, and also facilitates the large-scale assembly and subsequent maintenance of the whole machine. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the transmission component in this invention.

[0025] Figure 3 This is a schematic diagram of the unfolded structure of the multi-stage telescopic sleeve assembly in this invention.

[0026] Figure 4 This is a cross-sectional view of the unfolded structure of the multi-stage telescopic sleeve assembly in this invention.

[0027] Figure 5 This is a cross-sectional view of the telescopic structure of the multi-stage telescopic sleeve assembly in this invention.

[0028] Figure 6 This is a schematic diagram of the linkage structure of the second transmission nut of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that this application is not limited to the exemplary embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 invention 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 invention.

[0031] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the embodiments of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Please see Figures 1-6 In this embodiment of the invention, a composite telescopic lifting mechanism adapted to a high-lift treadmill includes: a module base 1 and a drive motor 3, a multi-stage telescopic sleeve assembly 4, and a transmission assembly 5 mounted on the module base 1.

[0034] The drive motor 3 and the multi-stage telescopic sleeve assembly 4 are connected and coordinated through the transmission assembly 5. The multi-stage telescopic sleeve assembly 4 is connected and coordinated with the lifting mechanism of the treadmill. The drive motor 3 drives the multi-stage telescopic sleeve assembly 4 to achieve telescopic movement, thereby realizing the lifting operation of the treadmill.

[0035] The multi-stage telescopic sleeve assembly 4 includes: a drive screw 41, at least one threaded sleeve 43, and an outer sleeve 44; the proximal end of the drive screw 41 is rotatably mounted in the module base 1 and engages with the drive assembly 5 for transmission.

[0036] A first transmission nut 42 is engaged on the transmission screw 41, and the near end of the threaded sleeve 43 is nested on the first transmission nut 42; a first limiting structure 411 is provided at the end of the transmission screw 41 to limit the maximum axial extension stroke of the threaded sleeve 43 relative to the transmission screw 41.

[0037] The outer circumference of the threaded sleeve 43 is threaded with a second transmission nut 45, and the proximal end of the outer sleeve 44 is nested on the second transmission nut 45; and the outer sleeve 44 is coaxially sleeved outside the threaded sleeve 43; a second limiting structure 431 is provided at the end of the threaded sleeve 43 to limit the maximum axial extension stroke of the outer sleeve 44 relative to the threaded sleeve 43.

[0038] The outer wall of the outer sleeve 44 is symmetrically provided with hinged connecting seats 441, which are used to connect with the lifting mechanism of the treadmill through a pin. While transmitting the lifting thrust, it can adapt to the angle change during the extension and retraction process to ensure smooth transmission without jamming.

[0039] The rotational power output by the drive motor 3 is transmitted to the transmission screw 41 via the transmission assembly 5, causing the transmission screw 41 to rotate around its own axis. The assembly transmits power sequentially through a two-stage threaded pair, realizing the progressive extension and retraction of the sleeve. The specific process is as follows:

[0040] Extension Stage: When the transmission screw 41 rotates forward, the first transmission nut 42, which meshes with it, generates axial thrust under the action of thread transmission, driving the threaded sleeve 43 to translate outward along the axial direction of the transmission screw 41. At this time, the threaded sleeve 43 itself does not rotate circumferentially, and there is no relative rotation between the second transmission nut 45 and the outer circumferential thread of the threaded sleeve 43. The outer sleeve 44 moves outward synchronously with the threaded sleeve 43. When the threaded sleeve 43 travels to its maximum axial stroke, it is blocked by the first limiting structure 411, and the axial displacement is locked, preventing it from continuing to translate outward. At this time, the torque of the continuous rotation of the transmission screw 41 is transmitted through the thread surface, driving the first transmission nut 42 and the threaded sleeve 43 to rotate circumferentially with the transmission screw 41. The rotating threaded sleeve 43 drives the second transmission nut 45 to generate relative axial thrust through the outer circumferential thread, driving the outer sleeve 44 to continue to extend outward relative to the threaded sleeve 43 until the outer sleeve 44 is blocked by the second limiting structure 431, reaching the overall maximum extension state.

[0041] Retraction Phase: The drive motor 3 rotates in reverse, causing the transmission screw 41 to rotate in the opposite direction. At this time, the threaded sleeve 43 first maintains circumferential synchronous reverse rotation, and the second-stage threaded pair reverses the transmission, causing the outer sleeve 44 to retract inward relative to the threaded sleeve 43. When the outer sleeve 44 retracts to the relative travel limit, the axial displacement is constrained, the threaded sleeve 43 stops rotating, and moves axially inward along the transmission screw 41 with the first transmission nut 42, causing the outer sleeve 44 to retract as a whole, and finally the whole assembly returns to the retracted state.

[0042] In the retracted state, the threaded sleeve 43 is nested and stored on the outer periphery of the transmission screw 41, and the outer sleeve 44 is nested and stored on the outer periphery of the threaded sleeve 43. The multi-stage structure is stacked and stored along the axial direction. The overall retracted length of the component is short and it occupies little installation space. When extended, it can obtain a working stroke several times that of the retracted length, and can achieve large stroke lifting adjustment within a limited installation space.

[0043] Furthermore, the transmission assembly 5 includes: a drive gear set 53, a transmission gear set 52, and a driven gear set 51;

[0044] The drive motor 3 is installed at the lower end of the module base 1, and the output shaft of the drive motor 3 extends vertically upward into the module base 1; the drive gear set 53 is fixed to the output shaft of the drive motor 3 or is in transmission cooperation with the output shaft of the drive motor 3.

[0045] Driven gear set 51 is fixed at the near end of transmission screw 41; transmission gear set 52 is located between drive gear set 53 and driven gear set 51, and meshes with drive gear set 53 and driven gear set 51 respectively; during operation, the rotational power output by drive motor 3 is transmitted step by step through gear sets, which drives transmission screw 41 to rotate around its own axis.

[0046] Furthermore, the module base 1 is also provided with a control component 6 for realizing stroke drive control. The control component 6 includes: a synchronous gear set 61, a stroke cam 62, a rotary potentiometer 63, and a micro switch 64.

[0047] Synchronous gear set 61 is engaged with transmission assembly 5 (meshing with transmission gear set 52 in transmission assembly 5); and stroke cam 62 and rotary potentiometer 63 are coaxially and synchronously set with synchronous gear set 61, and rotate together with synchronous gear set 61.

[0048] The micro switch 64 is fixedly installed in the module base 1 at the position corresponding to the stroke cam 62. When the stroke cam 62 rotates to the set angle with the synchronous gear set 61, its protrusion presses against and triggers the micro switch 64. Corresponding to the two stroke limits of the sleeve extension and retraction, the micro switch outputs a position signal to control the start and stop of the drive motor 3.

[0049] The rotary potentiometer 63 synchronously outputs a continuous analog signal corresponding to the rotation angle, which can be used to calculate the current extension and retraction displacement of the sleeve in real time. It works in conjunction with the limit switch of the micro switch 64 to form a complete stroke control system.

[0050] Furthermore, the control component 6 includes at least two sets of stroke cams 62 and two micro switches 64; both stroke cams 62 are coaxially and synchronously rotated with the synchronous gear set 61 and are staggered in phase, respectively corresponding to the maximum extension and full retraction strokes of the multi-stage telescopic sleeve assembly 4; the two micro switches 64 are fixed in the module base 1 and correspond one-to-one with each stroke cam 62. When the stroke cam 62 rotates to the corresponding angle, its protrusion presses against and triggers the corresponding micro switch 64, outputting a position signal to control the start and stop of the drive motor 3.

[0051] Preferably, a connecting bearing 2 is provided at the assembly position of the transmission screw 41 and the module base 1. The transmission screw 41 is rotatably assembled in the module base 1 through the connecting bearing 2, which is used to reduce rotational friction and ensure rotational coaxiality.

[0052] Furthermore, both the first limiting structure 411 and the second limiting structure 431 are limiting nut structures, which are fixed to the ends of the transmission screw 41 and the threaded sleeve 43, respectively. The outer diameter of the first limiting structure 411 is larger than the inner diameter of the first transmission nut 42, and the outer diameter of the second limiting structure 431 is larger than the inner diameter of the second transmission nut 45, forming two-stage axial stop steps. This can prevent the two-stage transmission nuts from unscrewing and disengaging from the corresponding screws, and can also lock the axial displacement when the sleeve extends to its limit stroke, triggering the transmission switching of the next stage of the threaded pair.

[0053] Preferably, the first transmission nut 42 adopts a T-shaped stepped structure, including: a nut end 422 and a flange end 421; the lower end face of the flange end 421 abuts against the near end face of the threaded sleeve 43; when the first transmission nut 42 rotates, it transmits the transmission thrust evenly to the threaded sleeve 43, pushing it to move axially along the transmission screw 41.

[0054] The second transmission nut 45 adopts a sleeve-shaped structure, and the upper end face of the second transmission nut 45 abuts against the inner top end face of the outer sleeve 44; the outer sleeve 44 is formed with a limiting baffle 442 that is recessed inward, and the lower end of the second transmission nut 45 (by setting a contact retaining ring 46) abuts against the limiting baffle 442; the bidirectional axial limit is located inside the outer sleeve 44; when the second transmission nut 45 rotates with the threaded sleeve 43, it can transmit axial force in both directions, driving the outer sleeve 44 to complete the extension and retraction action synchronously along the threaded sleeve 43.

[0055] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite telescopic lifting mechanism adapted to a high-lift treadmill, characterized in that, include: Module base and drive motor, multi-stage telescopic sleeve assembly and transmission assembly mounted on the module base; The drive motor and the multi-stage telescopic sleeve assembly are connected by a transmission component; The multi-stage telescopic sleeve assembly includes: a drive screw, at least one threaded sleeve, and an outer sleeve; the proximal end of the drive screw is rotatably mounted in the module base and engages with the drive assembly for transmission. A first transmission nut is engaged on the transmission screw, and the near end of the threaded sleeve is nested on the first transmission nut; a first limiting structure is provided at the end of the transmission screw; The outer circumference of the threaded sleeve is threaded with a second transmission nut, and the proximal end of the outer sleeve is nested on the second transmission nut; the outer sleeve is coaxially sleeved outside the threaded sleeve; a second limiting structure is provided at the end position of the threaded sleeve.

2. The composite telescopic lifting mechanism adapted to a high-lift treadmill according to claim 1, characterized in that, The transmission components include: a drive gear set, a transmission gear set, and a driven gear set; The drive motor is installed at the lower end of the module base, and the output shaft of the drive motor extends vertically upward into the module base; the drive gear set is fixed to the output shaft of the drive motor. The driven gear set is fixed at the near end of the transmission screw; the transmission gear set is located between the driving gear set and the driven gear set, and meshes with the driving gear set and the driven gear set respectively.

3. The composite telescopic lifting mechanism adapted to a high-lift treadmill according to claim 1, characterized in that, The module base is also equipped with a control component for implementing stroke drive control, which includes: a synchronous gear set, a stroke cam, a rotary potentiometer, and a micro switch; The synchronous gear set is engaged with the transmission component; and the stroke cam and rotary potentiometer are coaxially and synchronously set with the synchronous gear set, rotating together with the synchronous gear set. The micro switch is fixedly installed in the module base at the position corresponding to the stroke cam.

4. The composite telescopic lifting mechanism adapted to a high-lift treadmill according to claim 3, characterized in that, The control assembly includes at least two sets of stroke cams and two microswitches; both stroke cams rotate synchronously with the synchronous gear set on the same axis but with their phases staggered.

5. A composite telescopic lifting mechanism adapted to a high-lift treadmill according to claim 1, characterized in that, A connecting bearing is provided at the assembly position of the transmission screw and the module base, and the transmission screw is rotatably assembled in the module base through the connecting bearing.

6. A composite telescopic lifting mechanism adapted to a high-lift treadmill according to claim 1, characterized in that, Both the first and second limiting structures are limiting nut structures, which are fixed to the ends of the transmission screw and the threaded sleeve, respectively. The outer diameter of the first limiting structure is larger than the inner diameter of the first transmission nut, and the outer diameter of the second limiting structure is larger than the inner diameter of the second transmission nut.

7. A composite telescopic lifting mechanism adapted to a high-lift treadmill according to claim 1, characterized in that, The first transmission nut adopts a T-shaped stepped structure, including: a nut end and a flange end; the lower end face of the flange end abuts against the near end face of the threaded sleeve. The second transmission nut adopts a sleeve-shaped structure, with its upper end face abutting against the inner top end face of the outer sleeve; a limiting baffle is formed on the outer sleeve, and the lower end of the second transmission nut abuts against the limiting baffle.

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