Gear self-adapting length measuring mechanism

Abstract

The utility model discloses a gear self -adaptation length measuring mechanism belongs to the length measuring mechanism of length sensor. It includes first gear module, fixed base, elastic connecting piece, second gear module, base, workstation, first gear module with fixed base fixed connection, fixed base and base sliding connection are used for limiting the relative deflection of first gear module and second gear module in the meshing process, second gear module with first gear module drive connection with workstation fixed connection, one end of elastic connecting piece with the end of workstation connects, and the other end fixed connection is established on fixed base, the base is fixed on the workstation through fastener, the utility model discloses through automatic regulation gear center distance, eliminates the influence of gear meshing gap, makes the sensor have higher measuring accuracy.

Description

Technical Field

[0001] This utility model relates to a length measuring mechanism for a length sensor, and more particularly to a gear-adaptive length measuring mechanism. Background Technology

[0002] Currently, length sensors mostly achieve their length measurement function through gear meshing transmission mechanisms. However, the center distance between the gears in existing length measuring mechanisms is generally fixed. During the manufacturing process, random errors can cause deviations in the gear center distance, resulting in random fluctuations in the gear meshing clearance. This not only leads to significant transmission errors but also directly affects the measurement accuracy of the sensor.

[0003] Furthermore, when the ambient temperature changes, the gears will undergo dimensional changes due to thermal expansion and contraction. This change will not only amplify the existing transmission error, but in severe cases, it may also cause the gears to jam, significantly reducing the stability and reliability of the sensor. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the design mentioned in the background art and to provide a gear adaptive length measuring mechanism.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] On one hand, this utility model provides a gear adaptive length measuring mechanism, including a first gear module, a fixed base, an elastic connector, a second gear module, a base, and a worktable; the first gear module is fixedly connected to the fixed base, and the bottom of the fixed base is slidably connected to the base to limit the relative misalignment of the first gear module and the second gear module during meshing; the second gear module is drivenly connected to the first gear module and fixedly connected to the worktable; one end of the elastic connector is connected to the end of the worktable, and the other end is fixedly connected to the fixed base; the base is fixed on the worktable.

[0007] The first gear module is fixed to the base and slides into it. Multiple elastic connectors allow the first gear module to move towards the second gear module. The second gear module is fixed to the worktable to prevent meshing backlash during gear transmission, ensuring the gears are always engaged and guaranteeing the sensor's measurement accuracy. The base is fixed to the worktable, ensuring the stability of the relative movement between the base and the fixed mount, and also increasing the adaptability of the device.

[0008] As a further improvement of this utility model, the first gear module includes a first gear, a gear shaft, and a radial fastening assembly; the first gear is sleeved on the gear shaft, and the gear shaft is connected to the fixed seat through a first bearing; the radial fastening assembly is arranged radially along the first gear and connected to the first gear; the radial fastening assembly applies a radial force to the gear shaft to restrict the relative movement between the first gear and the gear shaft.

[0009] The first bearing effectively disperses and transmits the radial / axial load on the gear bearing to the fixed seat, preventing the gear shaft from deforming due to excessive local stress. Under conditions of vibration, impact, or temperature changes, it buffers stress, suppresses wobbling, and extends the service life of the gear shaft and fixed seat, ensuring long-term efficient operation of the device. The radial clamping action of the radial fastening assembly stably restricts the relative movement between the first gear and the gear shaft. Its simple structure makes it suitable for various light-load transmission scenarios.

[0010] As a further improvement of this utility model, the radial fastening assembly includes a set screw, which is threaded into the radial threaded hole of the first gear, and the end of the set screw is radially pressed against the outer circumferential surface of the gear shaft.

[0011] Using set screws (commonly known as set screws) as radial fasteners eliminates the need to machine mating holes on the gear shaft, reducing damage to the gear shaft structure. Furthermore, the tightening force can be adjusted via the thread, facilitating precision adjustment during installation.

[0012] As a further improvement of this utility model, the second gear module includes a second gear and a central shaft; the second gear is sleeved on the central shaft and fixed circumferentially and axially through an interference fit.

[0013] The second gear has no relative rotation with the central shaft and is fixedly connected to the worktable. Synchronous transmission can prevent slippage and ensure transmission accuracy. Radial positioning limits runout and distributes load to improve structural rigidity and resistance to deformation. At the same time, the worktable simplifies assembly, enhances vibration, and improves stability under temperature changes, ensuring accurate and reliable motion transmission of the second gear.

[0014] As a further improvement of this utility model, a second bearing is provided between the central shaft and the worktable, and a through hole is provided on the worktable for the central shaft to pass through, with the central shaft and the through hole having a clearance fit.

[0015] By replacing the contact friction between the central shaft and the worktable with non-contact friction through the rolling or sliding friction of the second bearing, the frictional resistance and wear during relative rotation of the two are significantly reduced, and energy loss is reduced. At the same time, the second bearing can precisely constrain the radial and axial displacement of the central shaft, ensuring the coaxiality of the central shaft and the worktable, and improving rotational accuracy and stability.

[0016] As a further improvement of this utility model, the elastic connector includes a spring, which has a preload when the first gear and the second gear are in normal meshing, and the preload constitutes the tension force toward the second gear.

[0017] The tension spring provides a preload force to the first gear toward the second gear. It can eliminate the gap between the first gear and the second gear through continuous elastic force, ensuring stable contact between the two, buffering external impacts and deformations to adapt to position changes, and preload to avoid starting impact, thereby ensuring reliable function, precise movement and structural durability.

[0018] As a further improvement of this utility model, the top of the base is provided with two inverted trapezoidal guide rails, which cooperate with the two trapezoidal grooves provided at the bottom of the fixed seat.

[0019] Two sets of inverted trapezoidal guide rails cooperate with corresponding trapezoidal grooves to achieve multiple effects such as precise guidance, stable load-bearing, smooth movement and convenient assembly through complementary shapes, providing a foundation with precision, stability and durability for the relative movement between the fixed seat and the base.

[0020] As a further improvement of this utility model, the fastener is selected from at least one of threads, rivets, snaps, or pins.

[0021] The type of fixed connection between the base and the workbench can be flexibly selected according to different working conditions and usage requirements to ensure connection reliability and safety and reduce installation costs.

[0022] The beneficial effects achieved by this utility model are:

[0023] 1. The gear adaptive length measuring mechanism provided by this utility model adopts a modular design, integrating gears, fixed seats, gear shafts, and other components into a single module, reducing manufacturing and maintenance difficulties. Two elastic connectors pull the first gear module, ensuring it always tends to move towards the second gear module. When gaps appear between the two gears, the tension of the elastic connectors eliminates the gaps, achieving automatic adjustment of the gear center distance. Simultaneously, the first gear module is guided and limited by the fixed seat and base, ensuring the gears maintain their center distance adjustment direction and preventing gear misalignment. This design automatically adjusts the gear center distance, eliminating the influence of gear meshing clearance and resulting in higher measurement accuracy for the sensor.

[0024] 2. The gear adaptive length measuring mechanism provided by this utility model uses a spring to replace the meshing clearance caused by the error generated between the first gear and the second gear during transmission with a controllable preload, continuously eliminating the dynamic clearance between the first gear and the second gear, and using elastic deformation to compensate for the dynamic error of the second gear in real time; at the same time, it absorbs impact energy through elastic deformation, avoids rigid collisions between gears, avoids manual intervention, extends the service life of core components such as the first gear, the second gear, and the first bearing, extends the maintenance cycle, and significantly reduces equipment maintenance costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a gear adaptive length measuring mechanism provided in Embodiment 1 of this utility model;

[0026] Figure 2 This is a schematic cross-sectional view of the first gear module of this utility model;

[0027] Figure 3 This is a schematic diagram of the gear meshing position of this utility model.

[0028] The meanings of the markings in the attached diagram are as follows:

[0029] 1. Workbench; 2. Base; 3. Gear shaft; 4. First gear; 5. Spring; 6. Central shaft; 7. Second gear; 8. Fixed seat; 9. Set screw; 10. First bearing; 11. Second bearing. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] Example 1:

[0032] like Figure 1-2 As shown, the gear adaptive length measuring mechanism in this embodiment includes a first gear module, a fixed base 8, an elastic connector, a second gear module, a base 2, and a worktable 1. The first gear module is fixedly connected to the fixed base 8, and the fixed base 8 is slidably connected to the base 2 to limit the relative misalignment between the first gear module and the second gear module during meshing. The second gear module is drivenly connected to the first gear module and fixedly connected to the worktable 1. One end of the elastic connector is connected to the end of the worktable 1, and the other end is fixedly connected to the base 2. The base 2 is fixed on the worktable 1.

[0033] The first gear module includes a first gear 4, a gear shaft 3, and a radial fastening assembly. The first gear 4 is sleeved on the gear shaft 3, and the gear shaft 3 is connected to the fixed seat 8 via a first bearing 10. The radial fastening assembly is arranged radially along the first gear 4 and connected to the first gear 4. The radial fastening assembly applies a radial force to the gear shaft 3 to restrict the relative movement between the first gear 4 and the gear shaft 3. The radial fastening assembly includes a set screw 9, which is threaded into the radial threaded hole of the first gear 4, and the end of the set screw 9 is radially pressed against the outer circumferential surface of the gear shaft 3. The radial force of the set screw prevents relative movement between the first gear 4 and the gear shaft 3, preventing slippage and other phenomena, and ensuring the stable operation of the entire mechanism.

[0034] The second gear module includes a second gear 7 and a central shaft 6. The second gear 7 is sleeved on the central shaft 6 and fixed circumferentially and axially through an interference fit. A second bearing 11 is provided between the central shaft 6 and the worktable 1. The worktable 1 has a through hole for the central shaft 6 to pass through, and the central shaft 6 is clearance-fitted with the through hole. The elastic connecting member includes a spring 5. The spring 5 has a preload when the first gear 4 and the second gear 7 are in normal meshing state. The preload constitutes the tension towards the second gear 7.

[0035] The base 2 has two inverted trapezoidal guide rails on its top, which mate with two trapezoidal grooves on the bottom of the fixing seat 8. The fasteners are selected from at least one of threads, rivets, clips, or pins.

[0036] This device, based on the original gear meshing transmission, utilizes an elastic connector to link the first gear module and the second gear module. The second gear module remains stationary, while the preload provided by spring 5 ensures that the first gear module always tends to move towards the second gear module. The first gear module then moves in a preset direction along two trapezoidal tracks that mate with the fixed base 8 and the base 2. This ensures that even if the gears deform due to temperature changes, they will not shift or experience meshing gaps, thus preventing transmission errors and inaccurate measurement data. Through the combined action of spring 5 and the trapezoidal guides, the two gear modules adaptively adjust for gaps caused by vibration, temperature changes, and other factors, maintaining the gears in a meshed state and ensuring higher measurement accuracy for the sensor. Example

[0037] This embodiment shares the same inventive concept as Embodiment 1, both eliminating the influence of gear meshing clearance by automatically adjusting the gear center distance, thereby enabling the sensor to achieve higher measurement accuracy. However, adjustments are made to the selection of the elastic connecting component to adapt to different scenario requirements. The specific solution is as follows:

[0038] The flexible connector can also be replaced with a shape memory alloy component with shape memory effect and superelasticity. Before use, the shape memory alloy material is selected according to the operating temperature of the application environment to match the phase transition temperature, and the "memory shape" of the shape memory alloy is preset (such as the compressed state matching the meshing position of the first gear 4 and the second gear 7). When the ambient temperature changes and causes the first gear 4 and the second gear 7 to expand, the shape memory alloy automatically returns to the pre-designed "shortened state" (the meshing position of the first gear 4 and the second gear 7) due to the temperature change. During the recovery process, a continuous tensile force is generated, which tightly "holds" the deformed first gear 4 and the second gear 7, offsetting the gap caused by the deformation and maintaining the shape memory effect. Figure 3 The preload is shown. When the ambient temperature drops below the phase transition temperature of the shape memory alloy, the shape memory alloy enters a "variable state". At this time, the contraction of the first gear 4 and the second gear 7 will cause a squeezing tendency. The shape memory alloy will be stretched by external force, but because it still maintains a certain elasticity, it will not completely lose force. Instead, it will "adapt" to the contraction of the first gear 4 and the second gear 7 through deformation, and still maintain the basic preload force to avoid rigid collision.

[0039] Working Principle: In use, the base 2 is fixed to the workbench 1 by thread or other installation methods according to usage requirements. The inverted trapezoidal guide rail on the top of the base 2 cooperates with the trapezoidal groove on the bottom of the fixed seat 8, limiting the offset of the fixed seat 8 in the direction perpendicular to the guide rail. The first gear 4 is fixed to the fixed seat 8 with the cooperation of the first bearing 10 and the gear shaft 3, and the first gear 4 and the gear shaft 3 are fixed together by the set screw 9 to form the first gear module. The first gear module is connected to the workbench 1 by the spring 5, which constantly forms a tension force on the first gear 4 module. The second gear 7, as the driving gear, rotates with the central shaft 6. When the first gear 4 has meshing gap due to eccentricity or deformation, the tension force of the spring 5 pulls the first gear module toward the second gear 7, eliminating the gear meshing gap. The two inverted trapezoidal guide rails of the base 2 and the two trapezoidal grooves on the fixed seat 8 ensure that the first gear 4 module always slides along the guide rails, preventing gear misalignment.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A gear-adaptive length measuring mechanism, characterized in that: It includes a first gear module, a fixed base (8), an elastic connector, a second gear module, a base (2), and a worktable (1); The first gear module is fixedly connected to the fixed seat (8), and the fixed seat (8) is slidably connected to the base (2) to limit the relative deviation between the first gear module and the second gear module during the meshing process; The second gear module is connected to the first gear module in a transmission manner and is fixedly connected to the worktable (1); One end of the elastic connector is connected to the end of the workbench (1), and the other end is fixedly connected to the fixed base (8); the base (2) is fixed to the workbench (1) by fasteners.

2. The gear adaptive length measuring mechanism according to claim 1, characterized in that: The first gear module includes a first gear (4), a gear shaft (3), and a radial fastening assembly; The first gear (4) is sleeved on the gear shaft (3), and the gear shaft (3) is connected to the fixed seat (8) through the first bearing (10); the radial fastening assembly is arranged along the radial direction of the first gear (4) and is connected to the first gear (4); the radial fastening assembly applies a radial force to the gear shaft (3) to restrict the relative movement between the first gear (4) and the gear shaft (3).

3. The gear adaptive length measuring mechanism according to claim 2, characterized in that: The radial fastening assembly includes a set screw (9) that is threaded into the radial threaded hole of the first gear (4), and the end of the set screw (9) is radially pressed against the outer circumferential surface of the gear shaft (3).

4. The gear adaptive length measuring mechanism according to claim 1, characterized in that: The second gear module includes a second gear (7) and a central shaft (6); The second gear (7) is sleeved on the central shaft (6) and fixed circumferentially and axially through an interference fit.

5. The gear adaptive length measuring mechanism according to claim 4, characterized in that: A second bearing (11) is provided between the central shaft (6) and the worktable (1). The worktable (1) is provided with a through hole through which the central shaft (6) passes, and the central shaft (6) is clearance-fitted with the through hole.

6. The gear adaptive length measuring mechanism according to claim 2 or 4, characterized in that: The elastic connector includes a spring (5) which has a preload when the first gear (4) and the second gear (7) are in normal meshing, and the preload constitutes a pulling force toward the second gear (7).

7. The gear adaptive length measuring mechanism according to claim 1, characterized in that: The base (2) has two inverted trapezoidal guide rails on its top, which cooperate with the two trapezoidal grooves on the bottom of the fixed seat (8).

8. The gear adaptive length measuring mechanism according to claim 1, characterized in that: The fastener is selected from at least one of threads, rivets, clips, or pins.

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