Single-axis indexing mechanism applied to limited axial space

Abstract

The application discloses a single-shaft indexing mechanism applied to limited axial space, which comprises a base, a fixing assembly, a rotating assembly and an indexing platform; the fixing assembly is fixedly arranged on the base, and the rotating assembly is coaxially nested with the fixing assembly; a bearing is coaxially arranged between the fixing assembly and the rotating assembly; the inner ring of the bearing is fixedly connected with the fixing assembly, and the outer ring of the bearing is fixedly connected with the rotating assembly; the end where the base of the single-shaft indexing mechanism is located is defined as a bottom end, and the end opposite to the bottom end is defined as a top end; the indexing platform is coaxially arranged at the top end of the rotating assembly and is fixedly connected with the rotating assembly; an inertial element is arranged at the top of the indexing platform; the single-shaft indexing mechanism has small axial size, high rotation accuracy and wide application scenarios.

Description

Technical Field

[0001] This invention belongs to the field of inertial measurement technology, specifically relating to a single-axis indexing mechanism applied in a limited axial space. Background Technology

[0002] A single-axis indexing mechanism is a type of mechanism that can be applied in the field of inertial measurement to help an IMU (Integrated Inertial Navigation System) complete its positioning function. This mechanism needs to ensure rotational accuracy, axial stiffness, and radial stiffness. Currently, there are many single-axis indexing mechanisms that can meet the requirements of rotational accuracy, axial stiffness, and radial stiffness.

[0003] However, inertial navigation systems (INS) are commonly used in airborne and shipborne applications, where installation space is limited, especially axial installation space. Higher navigation accuracy requires a larger inertial element (INS). Within a limited axial installation space, existing single-axis indexing mechanisms cannot meet the axial dimension requirements to ensure navigation accuracy. Therefore, it is necessary to develop a single-axis indexing mechanism with a smaller axial dimension. Summary of the Invention

[0004] In view of this, the present invention provides a single-axis indexing mechanism applicable to limited axial space, which has small axial dimensions, high rotational accuracy, and wide applicability.

[0005] This invention is achieved through the following technical solution:

[0006] A single-axis indexing mechanism for use in a limited axial space includes: a base, a fixed component, a rotating component, and an indexing platform;

[0007] The fixed component is fixedly mounted on the base, and the rotating component is nested coaxially with the fixed component.

[0008] A bearing is coaxially arranged between the fixed component and the rotating component. The inner ring of the bearing is fixedly connected to the fixed component, and the outer ring of the bearing is fixedly connected to the rotating component.

[0009] Let the end where the base is located on the single-axis indexing mechanism be the bottom end, and the end opposite the bottom end be the top end; the indexing platform is coaxially set on the top of the rotating component and fixedly connected to the rotating component; the inertial element is set on the top of the indexing platform.

[0010] Furthermore, the single-axis indexing mechanism also includes a slip ring;

[0011] The slip ring is coaxially nested within the fixed assembly. The slip ring includes a slip ring stator and a slip ring rotor. The slip ring rotor is located on top of the slip ring stator, which is fixedly connected to the fixed assembly. The slip ring rotor is connected to the indexing platform and can rotate synchronously with the rotating assembly. The slip ring rotor is electrically connected to the inertial element, and the slip ring stator is electrically connected to external electrical components, enabling the external electrical components to acquire signals from the inertial element and supply power to the inertial element.

[0012] Furthermore, the fixing assembly includes a torque motor stator, a bearing inner ring support shaft, and a bearing inner ring pressure ring;

[0013] The top surface of the base is provided with two concentric annular bosses, the annular boss located on the inner circumference is called annular boss I, and the annular boss located on the outer circumference is called annular boss II; the stator of the torque motor is coaxially arranged in annular boss II and is fixedly connected to annular boss II.

[0014] The bearing inner ring support shaft is a cylindrical stepped structure, including a large diameter section and a small diameter section connected coaxially in sequence, forming an annular stepped surface I; the end of the large diameter section of the bearing inner ring support shaft is coaxially set in the annular boss I of the base, and the large diameter section of the bearing inner ring support shaft is fixedly connected to the base.

[0015] The bearing inner ring pressure ring is located at the small diameter end of the bearing inner ring support shaft and is fixedly connected to the end face of the small diameter end of the bearing inner ring support shaft; a coaxial annular boss III is provided on the outer circumference of the bottom surface of the bearing inner ring pressure ring; the inner diameter of the annular boss III is larger than the outer diameter of the small diameter section of the bearing inner ring support shaft.

[0016] The bearing is fitted onto the outer circumference of the small-diameter section of the bearing inner ring support shaft; the bottom end of the bearing inner ring abuts against the annular stepped surface I of the bearing inner ring support shaft, and the top end of the bearing inner ring abuts against the annular boss III of the bearing inner ring pressure ring.

[0017] Furthermore, the rotating assembly includes: a torque motor rotor, a bearing outer ring support shaft, and a bearing outer ring pressure ring;

[0018] The bearing outer ring support shaft is a cylindrical structure with cylindrical stepped holes machined along the axial direction, including a large-diameter hole section and a small-diameter hole section connected coaxially in sequence, and an annular stepped surface II is formed between the large-diameter hole and the small-diameter hole;

[0019] The bearing outer ring support shaft is coaxially sleeved on the outer circumference of the bearing, and the annular stepped surface II of the bearing outer ring support shaft abuts against the top of the bearing outer ring.

[0020] The bearing outer ring pressure ring is coaxially disposed at the bottom end of the bearing outer ring support shaft and is fixedly connected to the end face of the bearing outer ring pressure ring; the inner diameter of the bearing outer ring pressure ring is smaller than the outer diameter of the bearing outer ring; the top surface of the bearing outer ring pressure ring abuts against the bottom end of the bearing outer ring, thereby fixing the bearing outer ring support shaft on the bearing.

[0021] The torque motor rotor is coaxially nested on the outer circumference of the bearing outer ring support shaft and is fixedly connected to the bearing outer ring support shaft; at the same time, the torque motor rotor is coaxially nested on the inner side of the torque motor stator.

[0022] The indexing platform is coaxially positioned at the top of the bearing outer ring support shaft and is fixedly connected to the top surface of the bearing outer ring support shaft.

[0023] Furthermore, the indexing mechanism also includes a grating ring and a reading head;

[0024] The grating ring is coaxially fixed to the outer circumference of the indexing platform, and the reading head is fixedly mounted on the base, located on the periphery of the grating ring and opposite to the grating ring.

[0025] Furthermore, the bearing is selected based on the bearing precision, the bearing installation position, and the bearing support stiffness;

[0026] Among them, whether the bearing accuracy and the bearing installation position meet the requirements is judged by the shaft rotation accuracy Δθ;

[0027] Specifically, the formula for calculating the rotational accuracy Δθ of the shaft system is as follows:

[0028]

[0029] Where K is the radial runout of the bearing, and L is the distance from the axial mid-surface of the bearing to the sensitive center of the inertial element;

[0030] When -6"≤Δθ≤+6", the rotational accuracy of the shaft system meets the requirements, and therefore the accuracy and installation position of the bearings also meet the requirements.

[0031] When Δθ≤-6" or Δθ≥+6", the rotational accuracy of the shaft system does not meet the requirements, and the accuracy of the bearing and the installation position of the bearing do not meet the requirements.

[0032] Among them, -6" and +6" are empirical values.

[0033] Furthermore, the torque motor is selected based on the physical dimensions of the surrounding components, the load torque, and the motion parameters of the single-axis indexing mechanism;

[0034] Among them, the physical dimensions of the surrounding components include the outer diameter of the bearing and the inner diameter of the grating ring; the outer diameter of the torque motor rotor is larger than the outer diameter of the bearing to ensure sufficient space for installing the bearing outer ring support shaft; the outer diameter of the torque stator is smaller than the inner diameter of the grating ring to ensure sufficient space for installing the indexing platform.

[0035] The continuous stall torque of the torque motor needs to be greater than three times the load torque, where the load torque is the bearing static friction torque M. f and starting torque M q sum;

[0036] bearing static friction torque M f The calculation formula is:

[0037]

[0038] Where f is the static friction coefficient of the angular contact ball bearing, m is the structural mass of the rotating load, g is the acceleration due to gravity, and D is the outer diameter of the bearing.

[0039] Starting torque M q The calculation formula is:

[0040] M q =I×α

[0041] Where I is the moment of inertia and α is the empirical acceleration.

[0042] The motion parameters of the single-axis indexing mechanism are the maximum speed required by the shaft system where the bearing inner ring support shaft is located, and the rated speed of the torque motor must be greater than the maximum speed required by the shaft system where the bearing inner ring support shaft is located.

[0043] Furthermore, the grating ring is selected based on three parameters and performance requirements: diameter, maximum readout speed, and angular resolution.

[0044] Beneficial effects:

[0045] (1) By setting the fixed component and the rotating component coaxially nested, the present invention reduces the axial dimension and broadens the applicable scenarios of the single-axis indexing mechanism.

[0046] (2) The present invention sets the slip ring assembly coaxially nested inside the fixed assembly, which further reduces the axial dimension.

[0047] (3) The present invention fixes the bearing outer ring support shaft coaxially nested and fixed inside the bearing, and then fixes the bearing outer ring support shaft coaxially nested and fixed outside the bearing. Then, a torque motor with coaxial stator and rotor is used. The "concentric circle" structure minimizes the axial dimension and saves axial space.

[0048] (4) The present invention is also provided with a grating ring and a reading head, which can be used to measure the rotation angle and number of rotations of the rotating component, so as to obtain the motion parameters of the rotating component and monitor the motion state of the rotary mechanism.

[0049] (5) The bearings of the present invention are selected based on bearing accuracy, bearing installation position and bearing support stiffness, and the shaft rotation accuracy is used to judge whether the bearing accuracy and bearing installation position meet the requirements, thereby ensuring the high rotation accuracy of the shaft system of the single-axis indexing mechanism.

[0050] (6) The torque motor of the present invention is selected based on the physical dimensions of the surrounding components, the load torque and the motion parameters of the single-axis indexing mechanism, which can ensure the safety of the motor operation while reducing the axial dimension. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the single-axis indexing mechanism;

[0052] Figure 2 yes Figure 1 AA section view;

[0053] Figure 3 This is an exploded view of a single-axis indexing mechanism;

[0054] Among them, 1-slip ring, 2-indexing platform, 3-grating ring, 4-bearing inner ring pressure ring, 5-bearing outer ring support shaft, 6-bearing, 7-bearing outer ring pressure ring, 8-torque motor rotor, 9-bearing inner ring support shaft, 10-torque motor stator, 11-reading head, 12-reading head bracket, 13-base. Detailed Implementation

[0055] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] Example 1:

[0057] This embodiment provides a single-axis indexing mechanism applicable to a limited axial space. See attached diagram. Figure 1-3 It includes: a base 13, a fixing component, a rotating component, a rotation platform 2, a slip ring 1, a grating ring 3, and a reading head 11;

[0058] The fixed component is fixedly mounted on the base 13, and the rotating component is nested coaxially with the fixed component; the rotating component can rotate relative to the fixed component.

[0059] Let the end where the base 13 on the single-axis indexing mechanism is located be the bottom end, and the end opposite to the bottom end be the top end; the indexing platform 2 is coaxially set at the top of the rotating component and fixedly connected to the rotating component; the inertial element is set at the top of the indexing platform 2;

[0060] The slip ring 1 is coaxially nested within the fixed assembly. The slip ring 1 includes a slip ring stator and a slip ring rotor. The slip ring rotor is located on top of the slip ring stator, and the slip ring stator is fixedly connected to the fixed assembly. The slip ring rotor is connected to the indexing platform 2 and can rotate synchronously with the rotating assembly. The slip ring rotor is electrically connected to the inertial element, and the slip ring stator is electrically connected to external electrical components, enabling the external electrical components to acquire signals from the inertial element and supply power to the inertial element.

[0061] The grating ring 3 is coaxially fixed on the outer circumference of the indexing platform 2, and the reading head 11 is fixedly mounted on the base 13, located on the periphery of the grating ring 3 and opposite to the grating ring 3.

[0062] In one specific embodiment, the reading head 11 is fixedly mounted on the base 13 by the reading head bracket 12.

[0063] This embodiment reduces the axial dimension by coaxially nesting the fixed and rotating components, thus broadening the applicable scenarios for the single-axis indexing mechanism.

[0064] See appendix Figure 2 A bearing 6 is coaxially disposed between the fixed component and the rotating component. The inner ring of the bearing 6 is fixedly connected to the fixed component, and the outer ring of the bearing 6 is fixedly connected to the rotating component. In a specific embodiment, the bearing 6 is a double-row angular contact ball bearing.

[0065] See appendix Figure 2 The fixed components include a torque motor stator 10, a bearing inner ring support shaft 9, and a bearing inner ring pressure ring 4;

[0066] See appendix Figure 2 and 3 The top surface of the base 13 is provided with two concentric annular bosses, the annular boss located on the inner circumference is called annular boss I, and the annular boss located on the outer circumference is called annular boss II; the torque motor stator 10 is coaxially arranged in annular boss II and is fixedly connected to annular boss II.

[0067] The bearing inner ring support shaft 9 is a cylindrical stepped structure, including a large diameter section and a small diameter section connected coaxially in sequence, and the large diameter section and the small diameter section form an annular stepped surface I; the end of the large diameter section of the bearing inner ring support shaft 9 is coaxially set in the annular boss I of the base 13, and the large diameter section of the bearing inner ring support shaft 9 is fixedly connected to the base 13.

[0068] The bearing inner ring pressure ring 4 is located at the small diameter end of the bearing inner ring support shaft 9 and is fixedly connected to the end face of the small diameter end of the bearing inner ring support shaft 9; a coaxial annular boss Ⅲ is provided on the outer circumference of the bottom surface of the bearing inner ring pressure ring 4; the inner diameter of the annular boss Ⅲ is larger than the outer diameter of the small diameter section of the bearing inner ring support shaft 9.

[0069] Bearing 6 is fitted onto the outer circumference of the small-diameter section of the bearing inner ring support shaft 9; the bottom end of the inner ring of bearing 6 abuts against the annular stepped surface I of the bearing inner ring support shaft 9, and the top end of the inner ring of bearing 6 abuts against the annular boss III of the bearing inner ring pressure ring 4. The annular stepped surface I of the bearing inner ring support shaft 9 and the annular boss III of the bearing inner ring pressure ring 4 limit the movement of the inner ring of bearing 6;

[0070] The slip ring 1 mentioned above is coaxially nested within the fixed assembly, which means that the slip ring 1 is coaxially set within the bearing inner ring support shaft 9. The slip ring stator mentioned above is fixedly connected to the fixed assembly, which means that the slip ring stator is fixedly connected to the bearing inner ring support shaft 9.

[0071] The rotating assembly includes: a torque motor rotor 8, a bearing outer ring support shaft 5, and a bearing outer ring pressure ring 7;

[0072] The bearing outer ring support shaft 5 is a cylindrical structure with cylindrical stepped holes machined along the axial direction, including a large-diameter hole section and a small-diameter hole section connected coaxially in sequence, and an annular stepped surface II is formed between the large-diameter hole and the small-diameter hole;

[0073] The bearing outer ring support shaft 5 is coaxially sleeved on the outer circumference of the bearing 6, and the annular stepped surface II of the bearing outer ring support shaft 5 abuts against the top of the outer ring of the bearing 6.

[0074] The bearing outer ring pressure ring 7 is coaxially disposed at the bottom end of the bearing outer ring support shaft 5 and is fixedly connected to the end face of the bearing outer ring pressure ring 7; the inner diameter of the bearing outer ring pressure ring 7 is smaller than the outer diameter of the bearing 6 outer ring; the top surface of the bearing outer ring pressure ring 7 abuts against the bottom end of the bearing 6 outer ring, thereby fixing the bearing outer ring support shaft 5 on the bearing 6.

[0075] The torque motor rotor 8 is coaxially nested on the outer circumference of the bearing outer ring support shaft 5 and is fixedly connected to the bearing outer ring support shaft 5; at the same time, the torque motor rotor 8 is coaxially nested on the inner side of the torque motor stator 10; in a specific embodiment, the bottom end of the outer circumference of the bearing outer ring support shaft 5 is machined with an annular stepped surface Ⅲ, and the torque motor rotor 8 is fixedly connected to the annular stepped surface Ⅲ.

[0076] The indexing platform 2 mentioned above is coaxially positioned at the top of the rotating assembly. Specifically, the indexing platform 2 is coaxially positioned at the top of the bearing outer ring support shaft 5 and is fixedly connected to the top surface of the bearing outer ring support shaft 5.

[0077] In this embodiment, by coaxially nesting and fixing the inner ring support shaft 9 of the bearing to the inner side of the bearing 6, and then coaxially nesting and fixing the outer ring support shaft 5 of the bearing to the outer side of the bearing 6, and by using a torque motor with the stator and rotor coaxial, the "concentric circle" structure minimizes the axial dimension and saves axial space.

[0078] In one specific embodiment, the bottom surface of the indexing platform 2 is provided with an annular boss V along the inner circumference. The annular boss V and the bottom surface of the indexing platform 2 form an annular step surface V. The grating ring 3 is coaxially sleeved on the outer circumferential surface of the annular boss V and is fixedly connected to the annular step surface V.

[0079] In one specific embodiment, all of the above fixed connections are made using screws.

[0080] In one specific embodiment, the bearing 6 is selected based on the bearing precision, the bearing installation position, and the bearing support stiffness;

[0081] Among them, whether the bearing accuracy and the bearing installation position meet the requirements is judged by the shaft rotation accuracy Δθ;

[0082] Specifically, the formula for calculating the rotational accuracy Δθ of the shaft system is as follows:

[0083]

[0084] Where K is the radial runout of the bearing, and L is the distance from the axial mid-surface of the bearing to the sensitive center of the inertial element;

[0085] When -6"≤Δθ≤+6", the rotational accuracy of the shaft system meets the requirements, and therefore the accuracy and installation position of the bearings also meet the requirements.

[0086] When Δθ≤-6" or Δθ≥+6", the rotational accuracy of the shaft system does not meet the requirements, and the accuracy of the bearing and the installation position of the bearing do not meet the requirements.

[0087] Among them, -6" and +6" are empirical values.

[0088] In one specific embodiment, the grating ring is selected based on three parameters and performance requirements: diameter, maximum readout speed, and angular resolution.

[0089] In one specific embodiment, the torque motor is selected based on the physical dimensions of the surrounding components, the load torque, and the motion parameters of the single-axis indexing mechanism;

[0090] Among them, the physical dimensions of the surrounding components include the outer diameter of the bearing 6 and the inner diameter of the grating ring 3; the outer diameter of the torque motor rotor is larger than the outer diameter of the bearing 6 to ensure that enough space is left to install the bearing outer ring support shaft 5; the outer diameter of the torque stator 10 is smaller than the inner diameter of the grating ring 3 to ensure that enough space is left to install the indexing platform 2.

[0091] The continuous stall torque of a torque motor must be greater than three times the load torque to ensure the safe operation of the torque motor. The load torque is the bearing static friction torque M. f and starting torque M q sum;

[0092] bearing static friction torque M f The calculation formula is:

[0093]

[0094] Where f is the static friction coefficient of the angular contact ball bearing, m is the structural mass of the rotating load, g is the acceleration due to gravity, and D is the outer diameter of the bearing.

[0095] Starting torque M q The calculation formula is:

[0096] M q =I×α Formula (3)

[0097] Where I is the moment of inertia and α is the empirical acceleration.

[0098] The motion parameters of the single-axis indexing mechanism are the maximum speed required by the shaft system where the bearing inner ring support shaft 9 is located. The rated speed of the torque motor must be greater than the maximum speed required by the shaft system where the bearing inner ring support shaft 9 is located to ensure the safety of the torque motor operation.

[0099] In one specific embodiment, the slip ring 1 is selected based on the diameter of the bearing inner ring, provided that the conductivity and signal transmission functions are sufficient. The outer diameter of the slip ring 1 is smaller than the diameter of the inner circumference of the bearing inner ring to ensure that enough space is left to install the bearing inner ring support shaft 9. The total axial height after the bearing inner ring support shaft 9, bearing 6, bearing outer ring support shaft 5 and indexing platform are all assembled is H, and the axial length h of the slip ring is less than or equal to H.

[0100] Working principle:

[0101] The base 13 is fixed relative to the external carrier, and the inertial element is set on the indexing platform 2 and electrically connected to the slip ring 1;

[0102] The torque motor includes a torque motor stator 10 and a torque motor rotor 8. When the torque motor is started as a drive component, the torque motor stator 10, the bearing inner ring support shaft 9, the bearing inner ring pressure ring 4, and the slip ring stator are fixed to the base; the torque motor rotor 8, the bearing outer ring support shaft 5, the bearing outer ring pressure ring 7, and the slip ring rotor can rotate along the axis; thereby driving the inertial element to rotate, helping the IMU (Integrated Inertial Navigation System) to complete the positioning function.

[0103] The grating ring 3 and the reading head 11 are used to collect the rotation angle and number of rotations of the rotating component in order to obtain the motion parameters of the rotating component and monitor the motion state of the rotary mechanism.

[0104] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A single-axis indexing mechanism applied in a limited axial space, characterized in that, include: Base, fixing components, rotating components, and indexing platform; The fixed component is fixedly mounted on the base, and the rotating component is nested coaxially with the fixed component. A bearing is coaxially arranged between the fixed component and the rotating component. The inner ring of the bearing is fixedly connected to the fixed component, and the outer ring of the bearing is fixedly connected to the rotating component. Let the end where the base is located on the single-axis indexing mechanism be the bottom end, and the end opposite the bottom end be the top end; the indexing platform is coaxially set on the top of the rotating component and fixedly connected to the rotating component; the inertial element is set on the top of the indexing platform; It also includes slip rings; The slip ring is coaxially nested within the fixed assembly. The slip ring includes a slip ring stator and a slip ring rotor. The slip ring rotor is located on top of the slip ring stator, which is fixedly connected to the fixed assembly. The slip ring rotor is connected to the indexing platform and can rotate synchronously with the rotating assembly. The slip ring rotor is electrically connected to the inertial element, and the slip ring stator is electrically connected to external electrical components, enabling the external electrical components to acquire signals from the inertial element and supply power to the inertial element. The fixed assembly includes a torque motor stator, a bearing inner ring support shaft, and a bearing inner ring pressure ring. The top surface of the base is provided with two concentric annular bosses, the annular boss located on the inner circumference is called annular boss I, and the annular boss located on the outer circumference is called annular boss II; the stator of the torque motor is coaxially arranged in annular boss II and is fixedly connected to annular boss II. The bearing inner ring support shaft is a cylindrical stepped structure, including a large diameter section and a small diameter section connected coaxially in sequence, forming an annular stepped surface I; the end of the large diameter section of the bearing inner ring support shaft is coaxially set in the annular boss I of the base, and the large diameter section of the bearing inner ring support shaft is fixedly connected to the base. The bearing inner ring pressure ring is located at the small diameter end of the bearing inner ring support shaft and is fixedly connected to the end face of the small diameter end of the bearing inner ring support shaft; a coaxial annular boss III is provided on the outer circumference of the bottom surface of the bearing inner ring pressure ring; the inner diameter of the annular boss III is larger than the outer diameter of the small diameter section of the bearing inner ring support shaft. The bearing is fitted onto the outer circumference of the small-diameter section of the bearing inner ring support shaft; the bottom end of the bearing inner ring abuts against the annular stepped surface I of the bearing inner ring support shaft, and the top end of the bearing inner ring abuts against the annular boss III of the bearing inner ring pressure ring.

2. The single-axis indexing mechanism applied in a limited axial space as described in claim 1, characterized in that, The rotating assembly includes: a torque motor rotor, a bearing outer ring support shaft, and a bearing outer ring pressure ring; The bearing outer ring support shaft is a cylindrical structure with cylindrical stepped holes machined along the axial direction, including a large-diameter hole section and a small-diameter hole section connected coaxially in sequence, and an annular stepped surface II is formed between the large-diameter hole and the small-diameter hole; The bearing outer ring support shaft is coaxially sleeved on the outer circumference of the bearing, and the annular stepped surface II of the bearing outer ring support shaft abuts against the top of the bearing outer ring. The bearing outer ring pressure ring is coaxially disposed at the bottom end of the bearing outer ring support shaft and is fixedly connected to the end face of the bearing outer ring pressure ring; the inner diameter of the bearing outer ring pressure ring is smaller than the outer diameter of the bearing outer ring; the top surface of the bearing outer ring pressure ring abuts against the bottom end of the bearing outer ring, thereby fixing the bearing outer ring support shaft on the bearing. The torque motor rotor is coaxially nested on the outer circumference of the bearing outer ring support shaft and is fixedly connected to the bearing outer ring support shaft; at the same time, the torque motor rotor is coaxially nested on the inner side of the torque motor stator. The indexing platform is coaxially positioned at the top of the bearing outer ring support shaft and is fixedly connected to the top surface of the bearing outer ring support shaft.

3. The single-axis indexing mechanism applied in a limited axial space as described in claim 2, characterized in that, The indexing mechanism also includes an optical grating ring and a reading head; The grating ring is coaxially fixed to the outer circumference of the indexing platform, and the reading head is fixedly mounted on the base, located on the periphery of the grating ring and opposite to the grating ring.

4. A single-axis indexing mechanism applied in a limited axial space as described in any one of claims 1-3, characterized in that, The bearing is selected based on its precision, installation location, and support stiffness. Among these, the accuracy of the bearings and whether their installation positions meet the requirements are determined by the rotational accuracy of the shaft system. Make a judgment; Specifically, shaft rotation accuracy The calculation formula is: in, This refers to the radial runout of the bearing. It is the distance from the axial mid-surface of the bearing to the sensitive center of the inertial element; when If the rotational accuracy of the shaft system meets the requirements, then the accuracy of the bearing and the installation position of the bearing also meet the requirements. when If the rotational accuracy of the shaft system does not meet the requirements, then the accuracy of the bearing and the installation position of the bearing will not meet the requirements. in, and These are experience points.

5. The single-axis indexing mechanism applied in a limited axial space as described in claim 3, characterized in that, The torque motor is selected based on the physical dimensions of the surrounding components, the load torque, and the motion parameters of the single-axis indexing mechanism; Among them, the physical dimensions of the surrounding components include the outer diameter of the bearing and the inner diameter of the grating ring; the outer diameter of the torque motor rotor is larger than the outer diameter of the bearing to ensure sufficient space for installing the bearing outer ring support shaft; the outer diameter of the torque stator is smaller than the inner diameter of the grating ring to ensure sufficient space for installing the indexing platform. The continuous stall torque of a torque motor must be greater than three times the load torque, where the load torque is the static friction torque of the bearing. and starting torque sum; bearing static friction torque The calculation formula is: in, The static friction coefficient of an angular contact ball bearing. For the structural mass of the rotational load, It is the acceleration due to gravity. The outer diameter of the bearing; Starting torque The calculation formula is: Where I is the moment of inertia and α is the empirical acceleration; The motion parameters of the single-axis indexing mechanism are the maximum speed required by the shaft system where the bearing inner ring support shaft is located, and the rated speed of the torque motor must be greater than the maximum speed required by the shaft system where the bearing inner ring support shaft is located.

6. The single-axis indexing mechanism applied in a limited axial space as described in claim 3, characterized in that, The grating ring is selected based on three parameters: diameter, maximum readout speed, and angular resolution, as well as performance requirements.

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