A silent beat device and a shake machine

Abstract

The utility model relates to passive exercise apparatus field, and its specific disclosure is a kind of quiet type rhythm device and shake shake machine, and rhythm device includes rhythm drive mechanism and rhythm output mechanism.Rhythm drive mechanism contains including pedestal, rhythm frame and the rhythm drive mechanism for driving rhythm frame.Rhythm drive mechanism includes transmission shaft, eccentric cam and eccentric sleeve.Eccentric sleeve one end has the pivotal connection part for pivoting connection rhythm frame, and other end has the annular inlay part for movable inlay eccentric cam.Rhythm drive mechanism further includes first bearing and rubber sleeve.In rhythm drive device is assembled to pedestal and rhythm frame, and rubber sleeve is configured to be able to because its elastic deformation, for the small deflection that can occur between the axis of pivotal connection part and the axis of transmission shaft, provide compensation amount.When axis deflection occurs, rubber sleeve can buffer additional force due to deflection, avoid direct rigid collision and violent friction between components, to reduce noise.

Description

Technical Field

[0001] This utility model relates to the field of passive exercise equipment, and in particular to a silent rhythmic device and a shaking machine. Background Technology

[0002] In the field of fitness equipment and certain functional devices, rhythmic devices, as components that can generate regular movements to provide users with specific exercise effects or achieve specific functions, have a wide range of applications. For example, in products like shakers, the rhythmic device is the core component. It drives the shaking platform to vibrate regularly, so that different parts of the user's body are stimulated when standing on it, achieving the purpose of exercising muscles and promoting blood circulation.

[0003] Traditional rhythmic devices have several shortcomings in their structural design and working principle. Regarding the drive method, common rhythmic drive mechanisms often employ simple mechanical transmission structures, such as directly driving the rhythmic frame through a connecting rod and eccentric wheel. During operation, due to the rigid connections between components, even a slight misalignment between the drive shaft and the pivot axis of the rhythmic frame can lead to significant friction and stress concentration among the components. This not only results in considerable noise during operation, affecting the user experience, but also accelerates component wear over time, reduces the device's lifespan, and increases maintenance costs.

[0004] To address the aforementioned problems, existing technologies typically employ methods such as improving the machining accuracy of parts, selecting high-precision bearings, or adding vibration damping pads. However, these solutions have significant limitations: improving part accuracy significantly increases manufacturing costs; and adding vibration damping pads can only alleviate some vibration transmission, failing to fundamentally solve the problem of vibration generation and transmission within the transmission chain.

[0005] Therefore, there is an urgent need for an innovative solution to fundamentally reduce the operating noise of the rhythm device and extend its service life. Utility Model Content

[0006] This invention addresses the problems of high operating noise and easy wear of components caused by the rigid connection of the transmission chain in existing rhythmic devices. It provides a silent rhythmic device and a silent shaking machine containing the device, which can effectively absorb and compensate for the axial misalignment generated during assembly and operation, and suppress the generation of vibration and noise from the source.

[0007] To achieve the above objectives, in a first aspect, this utility model provides a silent rhythmic device, including a base, a rhythmic frame, and a rhythmic drive mechanism for driving the rhythmic frame. The rhythmic drive mechanism includes a drive shaft, an eccentric cam fixed to the drive shaft, and a swing sleeve for transmitting power between the eccentric cam and the rhythmic frame. One end of the swing sleeve has a pivot connection portion for pivotally connecting to the rhythmic frame, and the other end has an annular fitting portion for movably engaging the eccentric cam.

[0008] The rhythm drive mechanism further includes a first bearing and a rubber sleeve. The inner ring of the first bearing is fixed to the eccentric cam; its outer ring and the annular fitting portion of the eccentric sleeve are fixedly engaged by the rubber sleeve. When the rhythm drive device is assembled onto the base and the rhythm frame, the rubber sleeve is configured to compensate for any minor misalignment that may occur between the axis of the pivot connection and the axis of the drive shaft due to its elastic deformation.

[0009] Furthermore, a base buffer pad is provided at the bottom of the base, and the base buffer pad is configured to absorb the vibration transmitted to the base by the rhythm drive mechanism.

[0010] Furthermore, a rhythm frame buffer pad is provided on the top of the rhythm frame, and the rhythm frame buffer pad is configured to absorb the vibration transmitted from the rhythm drive mechanism to the rhythm frame.

[0011] Furthermore, the pivot connection has a pivot hole, which is movably connected to the rhythm frame by a pivot bolt. A pair of second bearings for connecting the pivot connection and the pivot bolt are installed in the pivot hole, and the pair of second bearings are arranged at intervals.

[0012] Furthermore, the pivot hole has a positioning step adapted to the outer ring of the second bearing, and the outer ring of the second bearing abuts against the positioning step.

[0013] Furthermore, a positioning sleeve adapted to the inner ring of the second bearing is fitted onto the pivot bolt, and the inner ring of the second bearing abuts against the positioning sleeve.

[0014] Furthermore, the rhythm frame has a pair of spaced-apart connecting ears that define an installation space between them. After the pivoting connection is inserted into the installation space, the pivoting bolt is passed through the connecting ears, the second bearing, and the positioning sleeve to connect the pivoting connection to the rhythm frame.

[0015] Furthermore, at least one flexible collar is provided between the positioning sleeve and the pivot hole. The flexible collar is configured to maintain the position of the positioning sleeve before the pivot connection is connected to the rhythm frame, so as to facilitate the pivot bolt passing through the second bearing and the positioning sleeve during assembly.

[0016] Furthermore, the two ends of the pivot hole are also provided with locking end caps for locking the inner ring of the second bearing.

[0017] Furthermore, the pivot connection has a pivot shaft, and a second bearing is installed between the pivot connection and the rhythm frame.

[0018] Furthermore, the rhythm frame is attached to the base via a linkage mechanism configured to constrain the motion path of the rhythm frame.

[0019] Secondly, this utility model provides a shaking machine, including a base shell and a shaking platform, and also includes the aforementioned silent rhythmic device. The base shell is attached to the bottom of the base, and the shaking platform is attached to the rhythmic frame.

[0020] Due to the adoption of the above technical solutions, this utility model has the following beneficial effects: 1. The silent rhythmic device of this application uses a rubber sleeve for fixed engagement between the outer ring of the first bearing and the annular fitting portion of the swing sleeve. Due to the elasticity of the rubber sleeve, it provides a small amount of deformation to accommodate misalignment between the pivot connection and the drive shaft when assembled onto the base and rhythmic frame. This design utilizes the elastic deformation characteristics of the rubber sleeve; when axial misalignment occurs, the rubber sleeve can absorb and buffer the additional force generated by the misalignment, avoiding direct rigid collisions and severe friction between components, thereby significantly reducing noise generated during device operation. Whether in a home fitness environment or a public fitness venue, the quiet operating environment allows users to focus more on enjoying the exercise process, improving the overall user experience and meeting users' needs for high-quality fitness equipment.

[0021] 2. The silent rhythmic device of this application not only reduces noise due to the slight deformation of the rubber sleeve, but more importantly, it reduces wear between components. The rubber sleeve absorbs the additional stress caused by axial misalignment, making the forces borne by components such as the eccentric cam and the swing sleeve more even and reasonable during operation, avoiding excessive wear caused by localized stress concentration. At the same time, the use of the first bearing also reduces friction between rotating parts, further reducing the degree of wear. As a result, the overall service life of the device is significantly extended, eliminating the need for frequent component replacements or maintenance by the user, greatly reducing the operating costs and maintenance difficulty of the equipment, and improving the economy and reliability of the product.

[0022] 3. In the silent rhythmic device of this application, a base buffer pad is provided at the bottom of the base, and a rhythmic frame buffer pad is provided at the top of the rhythmic frame. The base buffer pad can absorb the vibration transmitted from the rhythmic drive mechanism to the base, prevent the vibration from being transmitted to the placement surface through the base, and reduce interference with the surrounding environment; the rhythmic frame buffer pad can absorb the vibration transmitted from the rhythmic drive mechanism to the rhythmic frame, avoid the vibration acting directly on the user, and improve the user's comfort during use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of this utility model, and are not intended to limit this utility model.

[0024] Figure 1 This is a schematic diagram of the rhythm device in Embodiment 1 of this utility model; Figure 2 This is an exploded view of the rhythmic device in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the rhythmic drive mechanism in Embodiment 1 of this utility model; Figure 4 This is an exploded view of the rhythmic drive mechanism in Embodiment 1 of this utility model; Figure 5 for Figure 3 A cross-sectional view of the central rhythm drive mechanism (AA section). Figure 6 This is a schematic diagram of the deflection seat in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the flexible buffer component in Embodiment 1 of this utility model; Figure 8 This is a cross-sectional view of the connection between the sway sleeve and the gantry connector in Embodiment 2 of this utility model. Figure 9 This is a schematic diagram of the shaking machine in Embodiment 3 of this utility model; Figure 10 This is an exploded view of the shaking machine in Embodiment 3 of this utility model.

[0025] Figure label: 1. Rhythmic device; 10. Rhythmic drive mechanism; 11. Drive motor; 12. Eccentric cam; 13. Drive shaft; 131. Bearing housing; 132. Drive bearing; 133. Driven wheel; 134. Belt; 14. Swivel sleeve; 141. Annular fitting part; 142. Side wall; 143. Bottom wall; 144. Annular end cap; 145. Pivot connection part; 1451. Pivot hole; 1452. Positioning step; 1453. Locking end cap; 1454. Positioning sleeve ; 1455, Flexible collar; 146, Second bearing; 15, First bearing; 16, Pivot bolt; 17, Gantry connector; 171, Connecting lug; 18, Rubber sleeve; 181, First annular portion; 182, Second annular portion; 20, Base; 21, Base buffer pad; 22, Foot cup; 30, Rhythmic frame; 31, Connecting rod; 32, Rhythmic frame buffer pad; 40, Linkage structure; 41, Crossbar; 42, V-shaped rod; 421, Long side; 422, Short side; 100. Shaking machine; 101. Bottom shell; 102. Shaking platform. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. 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, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances.

[0030] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0031] Example 1: The silent rhythmic device provided in this embodiment includes a base, a rhythmic frame, and a rhythmic drive mechanism for driving the rhythmic frame. The rhythmic drive mechanism includes a transmission shaft, an eccentric cam fixed on the transmission shaft, and a swing sleeve for transmitting and connecting the eccentric cam and the rhythmic frame. One end of the swing sleeve has a pivot connection portion for pivotally connecting the rhythmic frame, and the other end has an annular fitting portion for movably engaging the eccentric cam. The rhythmic drive device also includes a first bearing. The inner ring of the first bearing is fixed to the eccentric cam, and its outer ring and the annular fitting portion are fixedly engaged by a rubber sleeve. When the rhythmic drive mechanism is assembled onto the base and the rhythmic frame, the rubber sleeve is configured to provide a small amount of deformation by causing the axis between the pivot connection portion and the transmission shaft to be misaligned.

[0032] Please see Figure 1 and Figure 2 As shown, the silent rhythmic device 1 of this embodiment includes three core parts: a base 20 serving as the structural support foundation, a rhythmic frame 30 for outputting reciprocating motion, and a rhythmic drive mechanism 10 for driving the rhythmic frame 30. The base 20 is typically made of stamped and welded metal sheet (such as steel plate) or machined from aluminum alloy profiles, possessing sufficient rigidity and strength to support the entire device. The base 20 is provided with various mounting holes and supports for installing other components.

[0033] See Figures 3 to 5 The rhythmic drive mechanism 10 is the core component that generates power, and it includes: The drive shaft 13 is rotatably positioned on the base 20 by means of a bearing housing 131 disposed on the base 20 and a drive bearing 132 mounted within the bearing housing 131. The drive bearing 132 ensures that the drive shaft 13 can rotate smoothly about its own axis.

[0034] An eccentric cam 12, at least one eccentric cam 12, is fixed to the drive shaft 13 by means of a key connection, interference fit, or set screw. The geometric center of the eccentric cam 12 does not coincide with the rotation center of the drive shaft 13, thereby generating centrifugal force during rotation, which is the source of the rhythm.

[0035] The eccentric sleeve 14 is an intermediate transmission component connecting the eccentric cam 12 and the rhythm frame 30. One end of the eccentric sleeve 14 has an annular fitting portion 141 for movably fitting the eccentric cam 12; the other end has a pivot connection portion 145 for pivotally connecting the rhythm frame 30.

[0036] The first bearing 15, preferably a deep groove ball bearing, has its inner ring fixed to the outer cylindrical surface of the eccentric cam 12 by an interference fit.

[0037] The rubber sleeve 18 can be made of a rubber material (such as nitrile rubber, NBR) with excellent elasticity, fatigue resistance, and damping properties. The outer ring of the first bearing 15 and the annular fitting portion 141 of the wobble sleeve 14 are not directly rigidly connected, but rather fixedly fitted through the rubber sleeve 18. Typically, an interference fit is used to press the rubber sleeve 18 into the inner hole of the annular fitting portion 141, while the outer ring of the bearing is also pressed into the inner hole of the rubber sleeve 18 with an interference fit, forming a "sandwich" type sandwich structure.

[0038] The core function of the rubber sleeve 18 is specifically configured to provide elastic deformation for minor misalignments that may occur between the axis of the pivot connection 145 and the axis of the drive shaft 13 when the entire rhythm drive mechanism 10 is finally assembled onto the base 20 and the rhythm frame 30. This is because machining and assembly errors of the base 20, the rhythm frame 30, and each mounting support are unavoidable, which may cause the two axes to be non-parallel or have inaccurate center distances in actual space. The elasticity of the rubber sleeve 18 allows the outer ring of the bearing to generate a small adaptive deflection and displacement within the annular fitting portion 141, thereby releasing the internal stress caused by the axis misalignment, avoiding forced off-center loading, jamming, and abnormal wear of the first bearing 15, and achieving silent operation from the root cause.

[0039] In a further embodiment, a base buffer pad is provided at the bottom of the base, and the base buffer pad is configured to absorb the vibration transmitted to the base by the rhythmic drive mechanism.

[0040] like Figure 2 and Figure 9 As shown, a base buffer pad 21 is provided at the bottom of the base 20. This buffer pad is typically made of elastic materials such as rubber or polyurethane and is fixed to the lower surface of the base 20 by adhesive bonding or screws. The screws can also be used to connect other components, such as the equipment's bottom shell. The base buffer pad 21 is configured to absorb vibrations transmitted to the base 20 by the rhythmic drive mechanism 10 during operation. Its function is to convert mechanical vibration energy into heat energy and dissipate it, effectively preventing vibration from being transmitted through the base 20 to the equipment casing (such as the bottom shell 101 of the shaker) and the ground, thus reducing solid-borne sound transmission and overall machine vibration.

[0041] In a further embodiment, a rhythm frame buffer pad is provided on the top of the rhythm frame, the rhythm frame buffer pad being configured to absorb the vibration transmitted to the rhythm frame by the rhythm drive mechanism.

[0042] like Figure 2 and Figure 9 As shown, a rhythm frame buffer pad 32 is provided on top of the rhythm frame 30. This buffer pad is also made of elastic material and is installed between the rhythm frame 30 and the final load (such as the vibration platform 102). The rhythm frame buffer pad 32 is configured to absorb vibrations transmitted from the rhythm drive mechanism 10 to the rhythm frame 30, especially high-frequency vibration components, preventing vibrations from being directly transmitted to the user and significantly improving comfort during use. The base buffer pad 21 and the rhythm frame buffer pad 32 together form a two-way barrier of "transmission path isolation".

[0043] To achieve the connection between the pivot connection 145 and the rhythm frame 30, in some embodiments, the pivot connection 145 is provided with a pivot hole, through which the rhythm frame is movably connected by a pivot bolt. A pair of second bearings for connecting the pivot connection 145 and the pivot bolt are installed in the pivot hole, and the pair of second bearings are arranged at intervals. For details of its specific structure, please refer to Embodiment 2.

[0044] In another embodiment, the pivot connection is configured in the shape of a shaft, and a second bearing is installed between the pivot connection and the rhythm frame.

[0045] In this embodiment, the pivot connection 145 can be directly configured in the shape of a shaft (not shown in the figure), that is, it is made into the form of a short shaft extending outward from the body of the oscillating sleeve 14. In this case, a second bearing is installed between the pivot connection 145 (i.e., the short shaft) and the rhythm frame 30. Specifically, the inner ring of the second bearing is fitted and fixed on the shaft-shaped pivot connection 145, while the outer ring of the second bearing is installed in the corresponding bearing seat hole on the rhythm frame 30.

[0046] This "shaft shape" design simplifies the connection structure between the oscillating sleeve 14 and the rhythm frame 30, reducing the number of parts (eliminating the need for a separate pivot bolt 16), and can reduce costs and assembly complexity in certain applications. Similarly, in this structure, the rubber sleeve 18 compensates for the misalignment between the axis of the pivot connection 145, which acts as a shaft, and the axis of the drive shaft 13.

[0047] In a further embodiment, the rhythm frame is attached to the base via a linkage mechanism configured to constrain the motion path of the rhythm frame.

[0048] See Figure 1 and Figure 2 The rhythm frame 30 is attached to the base 20 via a linkage mechanism 40. The linkage mechanism 40 is configured to constrain the motion path of the rhythm frame 30, converting its complex planar motion into ideal reciprocating motion. In a preferred embodiment, the linkage mechanism 40 consists of two symmetrically arranged sets of four-bar linkages. Each set of four-bar linkages includes a crossbar 41 and a V-shaped bar 42. The turning point of the V-shaped bar 42 is connected to a hinge support on the base 20 via a pin, forming a fixed hinge. The short side 422 of the V-shaped bar 42 is hinged to one end of the crossbar 41, while its long side 421 is hinged to the connecting rod 31 extending downward from the rhythm frame 30. This linkage mechanism 40 can accurately convert the swaying motion transmitted from the oscillating sleeve 14 into a smooth, reciprocating linear motion of the rhythm frame 30, which is basically vertical, avoiding platform swaying and twisting, and improving motion quality and user experience.

[0049] In a further embodiment, a drive motor fixed on the base is also included, and the transmission shaft is connected to the output shaft of the drive motor via a belt drive mechanism.

[0050] like Figure 3 and Figure 4As shown, the silent rhythmic device 1 also includes a drive motor 11 fixed on the base 20. The transmission shaft 13 is connected to the output shaft of the drive motor 11 via a belt drive mechanism. Specifically, a driving pulley is installed on the output shaft of the drive motor 11, and a driven pulley 133 is installed on the transmission shaft 13, with an annular belt 134 fitted between them. Belt drive has the advantages of smooth transmission, low noise, and buffering the impact during motor start-up and stop, and allows for a certain center distance adjustment tolerance. This flexible transmission method is highly compatible with the core rubber sleeve flexible compensation concept of this utility model, together constructing a silent drive system from the power source to the output end.

[0051] In a further embodiment, such as Figure 3 and Figure 4 As shown, two eccentric cams 12 and two corresponding eccentric sleeves 14 are provided on the drive shaft 13. These two cams can be configured according to design requirements: they can be installed in phase to superimpose the excitation force, increasing the output amplitude and force; or they can be installed at a specific angle (such as 180 degrees) to offset the inertial forces generated by the two eccentric sleeves 14, thereby significantly reducing the vibration of the whole machine and making the device run more smoothly. Each eccentric sleeve 14 is connected to the outer ring of the first bearing 15 through its own rubber sleeve 18, and together they drive the rhythm frame 30 (for example, through a common gantry connector 17 or separately).

[0052] In a preferred embodiment, the rubber sleeve 18 is designed as an annular structure, which is pre-compressed in the radial direction and fills the assembly gap between the outer ring of the first bearing 15 and the cavity wall of the annular fitting portion 141. This interference fit completely eliminates the original play, providing uniform, all-around elastic support for the bearing and ensuring excellent cushioning and noise reduction. Continue reading Figure 4 , Figure 5 and Figure 6 One end of the annular fitting portion 141 is provided with an integrally formed annular bottom wall 143. The other end is machined with threads or grooves to accommodate a detachable annular end cap 144. After the annular end cap 144 is fixed by screws, snaps, or limiting structures, it works together with the bottom wall 143 to axially lock the first bearing 15 and the rubber sleeve 18 within the annular fitting portion 141, forming a compact, stable, and easily assembled modular unit.

[0053] As a further preferred embodiment, see Figure 7 The structure of the rubber sleeve 18 is further optimized. It is not just a simple ring, but includes a first annular portion 181 corresponding to the side wall 142 of the annular fitting portion 141 and a second annular portion 182 corresponding to the bottom wall 143 of the annular fitting portion 141.

[0054] The first annular portion 181 is compressed and filled in the radial assembly gap between the outer ring of the first bearing 15 and the side wall 142 of the annular fitting portion 141, mainly used to withstand radial vibration and compensate for radial errors. The second annular portion 182 is compressed and filled in the axial assembly gap between one side end face of the first bearing 15 and the bottom wall 143 of the annular fitting portion 141, mainly used to withstand axial vibration impact and provide axial error compensation. This buffer with an "L"-shaped cross-section constitutes a three-dimensional buffer system that can effectively absorb vibration and impact in both radial and axial directions, providing more comprehensive performance.

[0055] In a further embodiment, the base 20 is also provided with foot cups 22 for supporting the device to the ground, providing stable support for the entire device.

[0056] Example 2: Based on Embodiment 1, this embodiment further optimizes the connection structure between the pivot connection 145 and the rhythm frame 30, solving the assembly accuracy and efficiency problems when using pivot bolt connections.

[0057] Please combine Figures 3 to 8 The pivot connection 145 has a pivot hole 1451. The pivot connection 145 is movably connected to the rhythm frame 30 via a pivot bolt 16. To achieve a low-friction and stable rotational connection, a pair of second bearings 146 are installed within the pivot hole 1451 to connect the pivot connection 145 and the pivot bolt 16. The pair of second bearings 146 are spaced apart within the pivot hole 1451. This double-bearing support structure significantly improves the rigidity and stability of the pivot connection, enabling it to better withstand the complex loads generated during the movement of the oscillating sleeve 14.

[0058] Furthermore, to achieve precise installation of the outer ring of the second bearing 146, the pivot hole 1451 has a positioning step 1452 adapted to the outer ring of the second bearing 146. During installation, the outer ring of the second bearing 146 rests against the positioning step 1452. The positioning step 1452 provides a reliable axial positioning reference for the bearing outer ring, ensuring the accuracy of the installation position of the two outer rings of the second bearing 146.

[0059] To achieve precise positioning of the inner ring of the second bearing 146, a positioning sleeve 1454 adapted to the inner ring of the second bearing 146 is fitted onto the pivot bolt 16. This positioning sleeve 1454 is located between the two second bearings 146, with its two end faces precisely abutting against the inner rings of the two second bearings 146. By precisely controlling the length of the positioning sleeve 1454, a preset axial distance can be maintained between the two bearing inner rings, thereby providing a suitable preload force to the bearing during final tightening and preventing the bearing from moving due to excessive clearance or increasing rotational resistance due to excessive preload.

[0060] The rhythm frame 30 has a pair of spaced-apart connecting ears 171, which define an installation space. After the pivot connection 145 is inserted into this installation space, the pivot bolt 16 is passed through the connecting ears 171, the second bearing 146, and the positioning sleeve 1454 to connect the pivot connection 145 to the rhythm frame 30. Specifically, the pair of connecting ears 171 can be connected to the bottom of the rhythm frame 30 by a crossbar or a cross plate, or the pair of connecting ears 171 can be two connecting plates connected to the gantry connector 17 at the bottom of the rhythm frame 30. During assembly, the pivot connection 145, which is equipped with the second bearing 146 and the positioning sleeve 1454, is first inserted into the installation space. Then, the pivot bolt 16 is passed through the through hole of the connecting lug 171 on one side, the inner ring of the second bearing 146 on one side, the inner hole of the positioning sleeve 1454, the inner ring of the second bearing 146 on the other side, and the through hole of the connecting lug 171 on the other side. Finally, the pivot bolt 16 is locked with fasteners such as nuts, so that the pivot connection 145 is reliably connected to the rhythm frame 30.

[0061] Furthermore, in order to solve the technical problem that the positioning sleeve 1454 is prone to skewing during the assembly process, making it difficult for the pivot bolt 16 to pass through, at least one flexible collar 1455 is provided between the positioning sleeve 1454 and the pivot hole 1451.

[0062] The flexible collar 1455 is made of a material with moderate elasticity and coefficient of friction (such as polyurethane, nylon or rubber), and is fitted on the outer circumference of the positioning sleeve 1454, with its outer circumferential surface abutting against the wall of the pivot hole 1451 of the pivot connection 145 in a slight interference fit.

[0063] The flexible collar 1455 is configured as an assembly aid element. Its core function is to temporarily maintain the positioning sleeve 1454 in a relatively centered position within the pivot hole 1451 by utilizing its own elasticity and friction before the pivot connection 145 is connected to the rhythm frame 30 (i.e., before the pivot bolt 16 is inserted). This ensures that during assembly, the inner hole of the positioning sleeve 1454 is substantially coaxial with the inner holes of the second bearings 146 at both ends, thereby facilitating the smooth passage of the pivot bolt 16 through the second bearings 146 and the positioning sleeve 1454, greatly reducing assembly difficulty and avoiding forced assembly due to misalignment and damage to precision components.

[0064] Furthermore, to ensure reliable fixing of the inner ring of the second bearing 146, locking end caps 1453 for locking the inner ring of the second bearing 146 are provided at both ends of the pivot hole 1451. During installation, the locking end caps 1453 are fixed to the pivot connection 145 with screws, and their inner wall is pressed against the end face of the inner ring of the second bearing 146. Combined with the abutment of the positioning sleeve 1454 on the other side of the bearing inner ring, the axial bidirectional locking of the inner ring of the second bearing 146 is achieved, forming a stable and reliable bearing fixing structure.

[0065] The assembly process of this embodiment is briefly described as follows: Pre-assembled yaw sleeve assembly: a. Press the flexible collar 1455 onto the outer circumference of the positioning sleeve 1454 to form a sub-assembly.

[0066] b. Insert the sub-assembly into the pivot hole 1451 of the pivot connection portion 145 of the oscillating sleeve 14. The outer side of the flexible collar 1455 will rub against the hole wall of the pivot hole 1451, temporarily and approximately concentrically fixing the positioning sleeve 1454 in the center of the pivot hole 1451.

[0067] c. Press the second bearing 146 into both ends of the pivot hole 1451, so that the inner end face of the bearing inner ring abuts against both ends of the positioning sleeve 1454.

[0068] d. Install the locking end cap 1453 and initially fix it with screws to complete the pre-assembly of the oscillating sleeve assembly.

[0069] Final assembly connection: a. Insert the pivot connection 145 of the pre-assembled yaw sleeve assembly (yaw sleeve 14, second bearing 146, positioning sleeve 1454, flexible collar 1455, locking end cap 1453) into the installation space between a pair of connecting ears 171 of the gantry connector 17, so that the through hole on the connecting ear 171 is aligned with the center hole of the locking end cap 1453.

[0070] b. Starting from the through hole of the connecting lug 171 on one side, the pivot bolt 16 passes through the following in sequence: the center hole of the left locking end cap 1453, the inner ring of the left second bearing 146, the inner hole of the positioning sleeve 1454, the inner ring of the right second bearing 146, the center hole of the right locking end cap 1453, and the through hole of the right connecting lug 171.

[0071] c. Tighten the nut on the other end of the pivot bolt 16 to complete the pivot connection.

[0072] d. Finally, fix the rhythm frame 30 onto the gantry connector 17.

[0073] The beneficial effects of this embodiment are as follows: Improved assembly convenience: The introduction of the flexible collar 1455 solves the problem of centering the positioning sleeve in the multi-bearing support structure, transforming the originally cumbersome and skill-dependent assembly process into a simple and reliable standardized operation, which significantly improves assembly efficiency and first-pass yield, making it particularly suitable for large-scale production.

[0074] Ensuring connection accuracy and reliability: The positioning sleeve 1454 precisely controls the bearing inner ring spacing, and the locking end cover 1453 achieves reliable locking of the bearing inner ring, thus constructing a high-precision, high-rigidity double bearing pivot connection pair, which effectively improves transmission smoothness and load-bearing capacity.

[0075] Protecting precision components: The smooth assembly process avoids scratches and impacts on the inner hole of the second bearing 146, the positioning sleeve 1454, and the pivot bolt 16, protecting the precision of the mating surfaces and extending the service life of key components.

[0076] Synergistic effect: This optimized design perfectly complements the error compensation mechanism of the core rubber sleeve 18 of this utility model. The rubber sleeve 18 compensates for large system assembly errors at the front end, while this structure ensures high precision of local connections at the rear end. The two work together to create an ultimate quiet and smooth experience throughout the entire chain from the power source to the output end.

[0077] In summary, this embodiment solves specific assembly process problems through the coordinated design of the positioning sleeve 1454 and the flexible collar 1455, and enhances the manufacturability, connection reliability and overall performance of the product.

[0078] Example 3: Please see Figure 9 and Figure 10 This embodiment provides a silent shaking machine 100, which uses the silent rhythm device 1 described in Embodiment 1.

[0079] The vibration machine 100 includes a base shell 101 serving as external support and protection, and a vibration platform 102 for the user to stand or place on. Its core component is an integrated silent rhythmic device 1. The base shell 101 is attached to the bottom of the base 20 via screws or other connectors. Typically, a base buffer pad 21 is provided between the base 20 and the base shell 101 to achieve vibration isolation. The base buffer pad 21 can be fixed using screws that secure the base shell 101. During installation, the base shell 101 is locked to the bottom of the base 20 by screws passing through these flexible buffer pads 21. The vibration platform 102 is fixedly attached to the rhythmic frame 30. A rhythmic frame buffer pad 32 is provided between the vibration platform 102 and the rhythmic frame 30, and the rhythmic frame buffer pad 32 can also be fixed using screws used to secure the vibration platform 102. When the device is started, the smooth, low-noise reciprocating rhythm generated by the rhythm device 1 is ultimately transmitted to the vibration platform 102 through the rhythm frame 30, providing users with a comfortable and quiet health therapy experience.

[0080] Working principle: After the user starts the device, the drive motor 11 drives the transmission shaft 13 to rotate via the belt 134, and the eccentric cam 12 fixed to it rotates accordingly. Due to the eccentric effect, the rotational motion of the cam is converted into the planar oscillating motion of the swing sleeve 14 through the first bearing 15 and the rubber sleeve 18. During this process, the rubber sleeve 18 continuously plays the role of error compensation and vibration reduction, ensuring smooth and quiet power transmission. The motion of the swing sleeve 14 is transmitted to the rhythm frame 30 through the pivot bolt 16 (and possibly the gantry connector 17). Under the constraint of the linkage mechanism 40, the rhythm frame 30 drives the vibration platform 102 to reciprocate along a preset stable trajectory (such as the vertical direction). The base buffer pad 21 and the rhythm frame buffer pad 32 absorb the vibration transmitted to the foundation structure and to the user, respectively. The entire system works in concert to achieve a highly efficient, stable and extremely quiet rhythmic output.

[0081] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A silent rhythmic device, comprising a base, a rhythmic frame, and a rhythmic drive mechanism for driving the rhythmic frame, the rhythmic drive mechanism comprising a drive shaft, an eccentric cam fixed on the drive shaft, and a swing sleeve for transmittingly connecting the eccentric cam and the rhythmic frame, one end of the swing sleeve having a pivot connection portion for pivotally connecting the rhythmic frame, and the other end having an annular fitting portion for movably engaging the eccentric cam; characterized in that, The rhythm drive device also includes: A first bearing, wherein the inner ring of the first bearing is fixedly connected to the eccentric cam, and the outer ring of the bearing and the annular fitting part are fixedly fitted by a rubber sleeve; When the rhythm drive mechanism is assembled onto the base and the rhythm frame, the rubber sleeve is configured to provide a small amount of deformation by causing the axis between the pivot connection and the drive shaft to deviate.

2. The silent rhythmic device according to claim 1, characterized in that, The base is provided with a base buffer pad at its bottom, which is configured to absorb the vibration transmitted from the rhythm drive mechanism to the base.

3. The silent rhythmic device according to claim 1, characterized in that, The top of the rhythm frame is provided with a rhythm frame buffer pad, which is configured to absorb the vibration transmitted from the rhythm drive mechanism to the rhythm frame.

4. The silent rhythmic device according to claim 1, characterized in that, The pivot connection has a pivot hole, which is movably connected to the rhythm frame by a pivot bolt. A pair of second bearings for connecting the pivot connection and the pivot bolt are installed in the pivot hole, and the pair of second bearings are arranged at intervals.

5. The silent rhythmic device according to claim 4, characterized in that, The pivot hole has a positioning step that is adapted to the outer ring of the second bearing, and the outer ring of the second bearing abuts against the positioning step.

6. The silent rhythmic device according to claim 4 or 5, characterized in that, A positioning sleeve adapted to the inner ring of the second bearing is fitted onto the pivot bolt, and the inner ring of the second bearing abuts against the positioning sleeve.

7. The silent rhythmic device according to claim 6, characterized in that, The rhythm frame has a pair of connecting ears arranged at intervals, defining an installation space between the pair of connecting ears. After the pivoting connection is inserted into the installation space, the pivoting bolt is passed through the connecting ears, the second bearing and the positioning sleeve to connect the pivoting connection to the rhythm frame.

8. The silent rhythmic device according to claim 7, characterized in that, At least one flexible collar is provided between the positioning sleeve and the pivot hole. The flexible collar is configured to maintain the position of the positioning sleeve before the pivot connection is connected to the rhythm frame, so as to facilitate the pivot bolt passing through the second bearing and the positioning sleeve during assembly.

9. The silent rhythmic device according to claim 1, characterized in that, The rhythm frame is attached to the base via a linkage mechanism, which is configured to constrain the motion path of the rhythm frame.

10. A shaking machine, comprising a base and a shaking platform, characterized in that, It also includes the silent rhythmic device according to any one of claims 1-9, wherein the bottom shell is attached to the bottom of the base and the shaking platform is attached to the rhythmic frame.

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