Built-in compression spring concentric rotation mechanism

Abstract

The utility model provides a built-in compression spring type concentric rotation mechanism, including drive shaft sleeve and the cam assembly that is located its outside, the compression spring is provided in the inside of cam assembly, the outer sleeve of cam assembly is provided with the center gear ring, the both sides of center gear ring are respectively meshed with large gear plate and pinion plate. Through built-in compression spring in the inside of cam assembly, and utilize the tension provided by this compression spring directly acts on center gear ring through cam assembly, effectively eliminated the meshing gap between center gear ring and bilateral large, small gear plate.

Description

Technical Field

[0001] This utility model relates to the technical field of concentric rotation mechanisms, specifically to a built-in compression spring type concentric rotation mechanism. Background Technology

[0002] Currently, built-in spring-loaded concentric rotary mechanisms are widely used in many fields, such as automotive hinges and industrial robotic arms. To improve motion smoothness and precision, existing technologies often employ elastic elements to eliminate meshing gaps between transmission components. For example, utility model patent CN220980230U discloses a typical solution that uses an eccentric cam with independent elastic damping blocks (such as rubber or polyurethane) on both sides. These damping blocks directly press against the inner sides of the toothed plates on both sides to achieve friction locking and gap compensation at any position.

[0003] However, while such structures can effectively suppress inertial displacement under high-speed motion, they rely on the design of external damping blocks. These damping blocks, being vulnerable components, are prone to aging and wear, resulting in high maintenance costs. Therefore, the industry urgently needs a simpler, more durable, and lower-cost concentric rotation mechanism. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies that rely on external elastic damping blocks to eliminate meshing gaps, resulting in easy aging and wear. It proposes a built-in compression spring type concentric rotation mechanism.

[0005] The technical solution of this utility model is implemented as follows:

[0006] The built-in spring-loaded concentric rotation mechanism includes a drive shaft sleeve and a cam assembly located outside it. The cam assembly has a spring inside and a central gear ring sleeved outside. Large gear plates and small gear plates mesh on both sides of the central gear ring, respectively.

[0007] Furthermore, a bushing is also fitted around the drive shaft sleeve and the cam assembly, and the bushing is disposed between the cam assembly and the central gear ring.

[0008] Furthermore, the bushing is a wear-resistant bushing.

[0009] Furthermore, the interior of the large tooth plate and / or the small tooth plate is provided with an outwardly recessed annular tooth groove, and the annular teeth of the central tooth ring mesh with the annular tooth groove.

[0010] Furthermore, the tooth profiles of the large and small gear plates are enlarged, with tooth height and / or tooth width greater than those of standard gears.

[0011] Furthermore, the cam assembly includes a cam body and the compression spring, and the cam body is provided with a mounting position for accommodating the compression spring.

[0012] Furthermore, the mounting position is provided with extension ribs at both the upper and lower ends of the compression spring, and the extension ribs extend into the upper and lower sides of the compression spring.

[0013] Furthermore, the mechanism is also provided with a protective sleeve on its exterior.

[0014] The beneficial effects of the technical solution provided in this application are as follows:

[0015] 1. This built-in spring-loaded concentric rotation mechanism effectively eliminates the meshing gap between the central gear ring and the large and small gear plates on both sides by embedding the spring inside the cam assembly and utilizing the tension provided by the spring to act directly on the central gear ring via the cam assembly. This structure completely abandons the existing technology's reliance on external elastic damping blocks for friction locking, which not only greatly simplifies the overall structure and reduces the number of parts, lowering manufacturing and assembly complexity, but also fundamentally avoids the inherent defects of non-metallic damping blocks being prone to aging and wear, significantly improving the reliability and service life of the mechanism.

[0016] 2. This built-in spring-loaded concentric rotating mechanism, combining a built-in spring with a central gear ring to eliminate backlash, creates a completely new force transmission path. Tension acts simultaneously and evenly on both meshing surfaces through the central gear ring, ensuring smooth and consistent torque transmission and overcoming the off-center friction and motion resistance that external damping blocks might introduce. This design achieves efficient backlash elimination while maintaining the precision and efficiency of pure gear meshing transmission, providing a simpler, lower-cost, and more durable core solution for various angle adjuster products. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the concentric rotation mechanism of this utility model;

[0019] Figure 2 This utility model Figure 1 Schematic diagram of section AA;

[0020] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is an exploded view of the concentric rotating mechanism of this utility model.

[0022] In the diagram: 10 Sheath, 20 Large gear plate, 30 Drive shaft sleeve, 40 Cam assembly, 41 Cam body, 42 Compression spring, 43 Extension rib, 50 Bushing, 60 Center gear ring, 70 Small gear plate. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] This utility model provides a concentric rotation mechanism with a built-in compression spring. The core of this mechanism lies in achieving efficient gap elimination and force transmission through the synergistic effect of the built-in compression spring and the central gear ring. (See attached diagram) Figure 4 As shown, the mechanism includes a drive shaft sleeve 30, a cam assembly 40, a central gear ring 60, a large gear plate 20, a small gear plate 70, a bushing 50, and a protective sleeve 10. The positional connections and functional design of these components ensure the high efficiency and reliability of the entire mechanism during operation.

[0025] The drive bushing 30 is the power input component of the entire mechanism, and a cam assembly 40 is externally mounted on it. The drive bushing 30 receives rotational power and transmits it to the cam assembly 40 via an external power source (e.g., a motor or manual drive device). The design of the cam assembly 40 is particularly crucial. It includes a cam body 41 and a compression spring 42. The cam body 41 has mounting positions for accommodating the compression spring 42, and the compression spring 42 is located inside the mounting positions. The two ends of the compression spring 42 abut against the upper and lower sides of the mounting positions, respectively. Specifically, each of the upper and lower ends of the mounting positions has an extension rib 43, which extends into the upper and lower sides of the compression spring 42. The extension ribs 43 limit the movement of the compression spring 42. The overall design of the cam assembly 40 allows the compression spring 42 to generate outward tension when the drive bushing 30 rotates, and this tension is transmitted to the central gear ring 60 via the cam body 41. The elastic characteristics of the compression spring 42 not only achieve force transmission but also provide the necessary tension support for eliminating meshing backlash.

[0026] A central gear ring 60 is fitted onto the outside of the cam assembly 40, and its annular teeth mesh with the annular tooth grooves of the large gear plate 20 and the small gear plate 70. Both the large gear plate 20 and the small gear plate 70 have outwardly recessed annular tooth grooves inside, and the annular teeth of the central gear ring 60 are embedded in these grooves, forming a precise gear meshing relationship. To enhance meshing strength and stability, the tooth profiles of the large gear plate 20 and the small gear plate 70 are enlarged, with tooth height and tooth width both greater than standard gear tooth profiles. This design not only improves the load-bearing capacity of the meshing surface but also reduces tooth surface wear caused by load variations.

[0027] A bushing 50 is disposed between the cam assembly 40 and the central gear ring 60, serving a protective and support function. The bushing 50 is typically made of wear-resistant materials, such as polytetrafluoroethylene (PTFE) or polymer composites. This material choice significantly reduces direct friction between the cam assembly 40 and the central gear ring 60, extending the service life of the mechanism. The inner and outer walls of the bushing 50 fit tightly with the cam assembly 40 and the central gear ring 60, respectively, ensuring uniform force distribution during transmission. Furthermore, the sheath 10 covers the entire exterior of the mechanism, protecting internal components from the influence of external environmental factors such as dust and moisture. The sheath 10 is preferably made of corrosion-resistant materials, such as stainless steel or engineering plastics, to meet the requirements of different operating conditions.

[0028] An external power source inputs rotational power through a drive bushing 30, which drives the cam assembly 40 to rotate. A compression spring 42 inside the cam assembly 40 generates outward tension, which is transmitted to the central gear ring 60 via the cam body 41. The central gear ring 60 transmits rotational motion to the large gear plate 20 and the small gear plate 70 through gear meshing. The tension provided by the compression spring 42 acts simultaneously and evenly on the meshing surfaces of the large gear plate 20 and the small gear plate 70 through the central gear ring 60, effectively eliminating the meshing gap between the central gear ring 60 and the large and small gear plates. This working mechanism ensures the smoothness and consistency of torque transmission, overcoming the problems of off-center friction and motion resistance that may arise from traditional external damping blocks.

[0029] This utility model's built-in spring-loaded concentric rotating mechanism can be widely used in automotive hinges, industrial robotic arms, and other fields. For example, in the application of automotive seat adjusters, this mechanism can achieve precise adjustment and stable locking of the seat back angle. When the driver adjusts the seat back angle, an external power source inputs rotational power through the drive bushing 30. The drive bushing 30 drives the cam assembly 40 to rotate, and the spring 42 inside the cam assembly 40 generates tension, which is transmitted to the central gear ring 60 through the cam body 41. The central gear ring 60 transmits the rotational motion to the large gear plate 20 and the small gear plate 70 through gear meshing, thereby realizing the adjustment of the seat back angle. Throughout the adjustment process, the tension provided by the spring 42 acts simultaneously and evenly on the meshing surfaces of the large gear plate 20 and the small gear plate 70 through the central gear ring 60, eliminating meshing gaps and ensuring the accuracy and stability of the seat back angle adjustment.

[0030] Furthermore, this invention offers significant cost advantages and ease of maintenance. Traditional external damping block solutions rely on non-metallic elastic materials, which are prone to aging and wear, increasing maintenance costs and replacement frequency. In contrast, this invention employs a purely mechanical structure, eliminating the need for special materials or complex processes, significantly reducing manufacturing and maintenance costs. The compression spring 42, as a metallic component, avoids the inherent defects of non-metallic damping blocks, significantly improving the reliability and service life of the mechanism. Simultaneously, the design of the sheath 10 and bushing 50 further optimizes the durability and stability of the mechanism, enabling it to maintain long-term, high-efficiency operation even in harsh environments.

[0031] In summary, this utility model's built-in spring-type concentric rotation mechanism, through innovative structural design and force transmission path, solves the problems of complex structure, cumbersome assembly, easy aging and wear, and high motion resistance existing in the prior art. Its core design includes the synergistic effect of the built-in spring and the central gear ring, the enlarged tooth profile meshing design, and the protective measures of wear-resistant bushings and sheaths, ensuring the efficiency, reliability, and economy of the mechanism during operation. The specific implementation of this utility model fully demonstrates the feasibility and superiority of its technical solution, providing a simple, low-cost, and highly reliable solution for various angle adjuster products.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A built-in spring-loaded concentric rotation mechanism, comprising a drive shaft sleeve (30) and a cam assembly (40) disposed outside thereon, characterized in that: The cam assembly (40) is provided with a compression spring (42) inside, and a central gear ring (60) is sleeved on the outside of the cam assembly (40). A large gear plate (20) and a small gear plate (70) are respectively engaged on both sides of the central gear ring (60).

2. The built-in compression spring type concentric rotation mechanism as described in claim 1, characterized in that, A bushing (50) is also fitted around the drive shaft sleeve (30) and the cam assembly (40), and the bushing (50) is disposed between the cam assembly (40) and the central gear ring (60).

3. The built-in compression spring type concentric rotation mechanism as described in claim 2, characterized in that, The bushing (50) is a wear-resistant bushing.

4. The built-in spring-loaded concentric rotation mechanism as described in claim 1, characterized in that, The large toothed plate (20) and / or the small toothed plate (70) are provided with outwardly recessed annular tooth grooves inside, and the annular teeth of the central toothed ring (60) mesh with the annular tooth grooves.

5. The built-in spring-loaded concentric rotation mechanism as described in claim 1, characterized in that, The tooth profiles of the large tooth plate (20) and the small tooth plate (70) are enlarged tooth profiles, with tooth height and / or tooth width greater than those of standard gears.

6. The built-in compression spring type concentric rotation mechanism as described in claim 1, characterized in that, The cam assembly (40) further includes a cam body (41) having a mounting position for accommodating the compression spring (42).

7. The built-in compression spring type concentric rotation mechanism as described in claim 6, characterized in that, The mounting position is provided with extension ribs (43) at both the upper and lower ends of the compression spring (42), and the extension ribs (43) extend into the upper and lower sides of the compression spring (42).

8. The built-in compression spring type concentric rotation mechanism as described in claim 1, characterized in that, The mechanism is also provided with a protective sleeve (10).

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