Space cold bearing shafting mechanism

Abstract

The present invention relates to a spatial cold standby bearing shaft system mechanism, comprising: a shaft system assembly, comprising a main shaft, a main bearing assembly, a backup bearing assembly and a sleeve; in a first shaft system diameter assembly mode and a second shaft system diameter assembly mode, the installation relationship between the main bearing assembly, the backup bearing assembly and the sleeve is different; wherein the second shaft system diameter is smaller than the first shaft system diameter; a locking release assembly, comprising a first locking part, a swing locking part and a locking seat, the first locking part is connected to the sleeve, and the locking seat is connected to the main shaft; in the main bearing assembly working mode: the first locking part and the locking seat are connected by the swing locking part to lock each other; in the backup bearing assembly working mode: the swing locking part rotates to separate the first locking part and the locking seat to unlock; a load assembly, connected to the shaft system assembly, and the shaft system assembly is used to drive the load assembly to move. The spatial cold standby bearing shaft system mechanism of the present invention has high reliability.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of space precision motion mechanisms in the aerospace field, and specifically relates to a space cold standby bearing shaft system mechanism. Background Art

[0002] The space precision motion shaft system is an important component of the spacecraft and is widely used in various space motion mechanisms, such as the satellite's solar wing drive mechanism, the space camera's scanning mechanism, and the antenna's pointing drive mechanism. The bearing assembly is a key component of the space precision motion shaft system. Its working state and service performance play a decisive role in the shaft system's stiffness, rotation accuracy, friction and other indicators, and directly affect whether the spacecraft can operate stably for a long time. With the increasing complexity of space missions, aerospace products have put forward longer life and higher reliability requirements for precision motion shaft systems and bearings.

[0003] According to statistics, more than 50% of the failures of space motion mechanisms are caused by bearing failure. At present, most space motion shaft systems do not have backup bearing structures. Once the bearing fails, the entire spacecraft motion mechanism will be stuck, so the spacecraft cannot work normally and the mission fails. The existing shaft system has the problem of low reliability. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a space cold standby bearing shaft system mechanism, which has high reliability. When one set of bearings fails to work, it can switch to another set of bearings to ensure the normal operation of the spacecraft, improve the service life and reliability of the spacecraft's bearings, and extend the spacecraft's on-orbit service time.

[0005] The technical solution adopted by the present application to solve the above-mentioned technical problems is a spatial cold standby bearing shaft system mechanism, including: a shaft system assembly, including a main shaft, a main bearing assembly, a backup bearing assembly and a sleeve; in a first shaft system diameter assembly mode: the backup bearing assembly, the sleeve, and the main bearing assembly are sleeved on the outer surface of the main shaft layer by layer from the inside to the outside; or, in a second shaft system diameter assembly mode: the main bearing assembly, the sleeve, and the backup bearing assembly are sleeved on the outer surface of the main shaft layer by layer from the inside to the outside; wherein the second shaft system diameter is smaller than the first shaft system diameter; a locking and releasing assembly, including a first locking part, a swing locking part and a locking seat, the first locking part is connected to the sleeve, and the locking seat is connected to the main shaft; in the main bearing assembly working mode: the first locking part and the locking seat are connected by the swing locking part to lock each other; in the backup bearing assembly working mode: the swing locking part rotates to separate the first locking part and the locking seat to unlock; a load assembly, connected to the shaft system assembly, and the shaft system assembly is used to drive the load assembly to move.

[0006] In one embodiment of the present application, the backup bearing assembly includes: a first backup bearing, a second backup bearing, a backup bearing spacer and a backup bearing pressure ring; in the first shaft system diameter assembly mode: the first backup bearing, the backup bearing spacer, the second backup bearing, and the backup bearing pressure ring are stacked on the main shaft from bottom to top; in the second shaft system diameter assembly mode: the first backup bearing, the backup bearing spacer, the second backup bearing, and the backup bearing pressure ring are stacked on the outer cylindrical surface of the sleeve from bottom to top.

[0007] In one embodiment of the present application, the main bearing assembly includes: a first main bearing, a second main bearing, a main bearing spacer, and a main bearing pressure ring; in the first shaft system diameter assembly mode: the first main bearing, the main bearing spacer, the second main bearing, and the main bearing pressure ring are stacked on the outer cylindrical surface of the sleeve from bottom to top; in the second shaft system diameter assembly mode: the first main bearing, the main bearing spacer, the second main bearing, and the main bearing pressure ring are stacked on the main shaft from bottom to top.

[0008] In one embodiment of the present application, a first locating shoulder and a second locating shoulder are provided on the main shaft; in the first shaft system diameter assembly mode: the first backup bearing and the first locating shoulder overlap, and the backup bearing pressure ring overlaps the second locating shoulder; in the second shaft system diameter assembly mode: the first main bearing and the first locating shoulder overlap, and the main bearing pressure ring overlaps the second locating shoulder.

[0009] In one embodiment of the present application, a support component is provided on the sleeve; in the first shaft system diameter assembly mode: the first main bearing and the support component are overlapped; in the second shaft system diameter assembly mode: the first backup bearing and the support component are overlapped.

[0010] In one embodiment of the present application, in the second shaft system diameter assembly mode: the first locking portion is also connected to the load assembly, and the locking seat is also connected to the end surface of the sleeve; there is a height difference between the primary bearing assembly and the backup bearing assembly.

[0011] In one embodiment of the present application, the locking and releasing assembly further includes: a rotating shaft, a torsion spring and a locking piece, the swing locking part is connected to the locking seat via the rotating shaft, one end of the torsion spring is connected to the rotating shaft, and the other end of the torsion spring is connected to the locking seat, and the elastic potential energy stored in the torsion spring is used to make the swing locking part rotate around the rotating shaft relative to the locking seat; a first through hole is provided on the first locking part, and a second through hole is provided on the swing locking part; in the working mode of the main bearing assembly: the locking piece passes through the first through hole and the second through hole to lock the first locking part with the swing locking part; in the working mode of the backup bearing assembly: the locking piece is disengaged from the second through hole to separate the first locking part from the swing locking part and thereby unlock it.

[0012] In one embodiment of the present application, in the first shaft system diameter assembly mode: in the main bearing assembly working mode: the torsion spring is in an elastic potential energy storage state, the sleeve and the main shaft are fixed as a whole through the locking release assembly, the main bearing assembly rotates and drives the load assembly to rotate; in the backup bearing assembly working mode: the torsion spring is in an elastic potential energy release state, the torsion spring drives the swing locking part to rotate toward the locking seat, the sleeve and the main shaft are separated, the backup bearing assembly rotates and drives the sleeve, the main bearing assembly, and the load assembly to rotate together.

[0013] In one embodiment of the present application, in the second shaft system diameter assembly mode: in the main bearing assembly working mode: the torsion spring is in an elastic potential energy storage state, the sleeve and the load assembly are fixed as a whole through the locking release assembly, the main bearing assembly rotates and drives the sleeve and the load assembly to rotate together; in the backup bearing assembly working mode: the torsion spring is in an elastic potential energy release state, the torsion spring drives the swing locking part to rotate toward the locking seat, the sleeve and the load assembly are separated, the backup bearing assembly rotates and drives the load assembly to rotate.

[0014] In one embodiment of the present application, the first backup bearing and the second backup bearing are a pair of angular contact ball bearings arranged back to back or face to face, and / or the first main bearing and the second main bearing are a pair of angular contact ball bearings arranged back to back or face to face.

[0015] The technical solution of the present application is to set a main bearing assembly and a backup bearing assembly, and when the main bearing assembly cannot work normally, it can be switched to the backup bearing assembly; in practical applications, the first shaft diameter assembly mode or the second shaft diameter assembly mode can be freely selected according to different shaft diameter requirements; the bearing backup is realized by the parallel connection of the bearing assembly and the cooperation of the locking and releasing assembly. Under normal conditions, the first locking part and the locking seat are locked with each other, at which time the backup bearing assembly is locked and cannot rotate, and the main bearing assembly can rotate normally; when the main bearing assembly reaches the end of its life or a jamming failure occurs, the first locking part and the locking seat are separated and unlocked, and the outer ring of the backup bearing assembly is released. At this time, the backup bearing assembly can drive the load assembly to continue to rotate, which can ensure that the spacecraft can perform its on-orbit mission normally. The present application can greatly improve the service life and reliability of bearings and extend the on-orbit service time of spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1 It is a schematic cross-sectional structure diagram of a spatial cold standby bearing shaft system mechanism according to an embodiment of the present application;

[0018] Figure 2is a schematic cross-sectional structural diagram of a shaft system assembly in one embodiment of the present application;

[0019] Figure 3 is a schematic diagram of a locking and releasing assembly in one embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the working mode of the main bearing assembly in one embodiment of the present application;

[0021] Figure 5 is a schematic diagram of a working mode of a backup bearing assembly in an embodiment of the present application;

[0022] Figure 6 is a schematic cross-sectional structural diagram of a spatial cold standby bearing shaft system mechanism according to another embodiment of the present application;

[0023] Figure 7 It is a schematic cross-sectional structural diagram of a shaft system assembly in another embodiment of the present application.

[0024] Description of the accompanying drawings in the specific implementation manner:

[0025] 1. Shaft system assembly; 101. Main shaft; 1011. First positioning shoulder; 1012. Second positioning shoulder; 102. First backup bearing; 103. First main bearing; 104. Second main bearing; 105. Second backup bearing; 106. Backup bearing pressure ring; 107. Main bearing pressure ring; 108. Main bearing spacer; 109. Backup bearing spacer; 110. Sleeve; 1101. Support component; 12. Main bearing assembly; 13. Backup bearing assembly; 2. Locking and releasing assembly; 201. First locking part; 202. Swing locking part; 2021. Second through hole; 203. Locking seat; 204. Rotating shaft; 205. Torsion spring; 206. Locking member; 3. Load assembly. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0028] As shown in this application, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0029] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0032] Hereinafter, embodiments of the present application will be described based on the accompanying drawings. However, the embodiments shown below are illustrations of space cold-standby bearing shaft systems for embodying the technical ideas of the present application, and the space cold-standby bearing shaft systems of the present application are not specific to the following contents. Furthermore, in order to facilitate the understanding of the scope of the claims, this specification assigns numbers corresponding to the components shown in the embodiments to the components shown in the "Claims" and "Contents of the Invention" columns. However, the components shown in the claims are by no means specified as the components of the embodiments. In particular, the dimensions, materials, shapes, and relative configurations of the constituent components recorded in the embodiments, if not specifically recorded, are not intended to limit the scope of the present application to these only, but are merely illustrative examples.

[0033] However, the dimensions or positional relationships of the components shown in the drawings are sometimes exaggerated for the purpose of clarifying the description. Furthermore, in the following description, for the same names and symbols, representing the same or homogeneous components, it is appropriate to omit their detailed description. Furthermore, the various elements constituting the present application may be in the form of a plurality of elements constituted by the same components so that one component serves as a plurality of elements, or conversely, it may be realized by a plurality of components sharing the function of a component. In addition, the contents described in some embodiments and implementation methods may also be utilized in other embodiments, implementation methods, etc. In addition, in this specification, "on" is not limited to the case where it is formed in contact with the upper surface, but also includes the case where it is formed separately on the upper surface, and is also used to include the meaning of the existence of an intervening layer between layers.

[0034] The present application proposes a space cold standby bearing shaft system mechanism, which can be applied to a spacecraft. For example, the space cold standby bearing shaft system mechanism of the present application includes a main bearing assembly in a normal working state and a backup bearing assembly in an inactive state. When the main bearing assembly fails to work due to a fault, the cold standby bearing (i.e., the backup bearing assembly) can be started to ensure that the spacecraft continues to operate stably.

[0035] The spatial cold standby bearing shaft system mechanism of the present application includes two types of embodiments, one of which corresponds to the first shaft system diameter assembly mode mentioned later, and the other corresponds to the second shaft system diameter assembly mode mentioned later. The main difference between the two types of embodiments is that the assembly methods of the components in the shaft system assembly are different. These two types of embodiments are first introduced here to facilitate the understanding of the technical solutions in the following text.

[0036] Figure 2 is a schematic cross-sectional view of a shaft system assembly in one embodiment of the present application, Figure 7 Schematic diagram of the cross-sectional structure of the shaft system assembly in another embodiment of the present application. Figure 2 and Figure 7As shown, the shaft system assembly 1 includes: a main shaft 101, a main bearing assembly 12, a backup bearing assembly 13 and a sleeve 110. In the first shaft system diameter assembly mode (corresponding to Figure 2 ): The backup bearing assembly 13, the sleeve 110, and the main bearing assembly 12 are sleeved on the outer surface of the main shaft 101 layer by layer from the inside to the outside. Or, in the second shaft system diameter assembly mode (corresponding to Figure 7 ): The main bearing assembly 12, the sleeve 110, and the backup bearing assembly 13 are sleeved on the outer surface of the main shaft 101 layer by layer from the inside to the outside.

[0037] For example, reference Figure 2 As shown, taking the first shaft system diameter assembly mode as an example, the inner ring of the backup bearing assembly 13 is installed on the outer surface of the main shaft 101; the inner wall of the sleeve 110 is installed on the outer ring of the backup bearing assembly 13; the inner ring of the main bearing assembly 12 is installed on the outer wall of the sleeve 110. The sleeve 110 has the function of paralleling and isolating the main and backup bearing assemblies. The main and backup bearing shaft system can be composed of two pairs of angular contact ball bearings installed in parallel. The sleeve arrangement mentioned in this application can be direct contact between the two components, indirect contact between the two components, or no contact between the two components.

[0038] For example, Figure 2 As shown, the diameter of the shaft system assembly 1 as a whole can be considered to be the first shaft system diameter; Figure 7 As shown, the diameter of the shaft assembly 1 as a whole can be considered to be the second shaft diameter. Figure 2 and Figure 7 When assembling the shaft assembly 1, the first shaft diameter assembly mode or the second shaft diameter assembly mode can be selected according to different application scenarios or shaft diameter requirements, and this application does not limit this.

[0039] Here, the first embodiment of the present application (corresponding to the first shaft system diameter assembly mode) is introduced, and the second embodiment (corresponding to the second shaft system diameter assembly mode) will be introduced later. In the first shaft system diameter assembly mode, it includes a primary bearing assembly working mode and a backup bearing assembly working mode.

[0040] Figure 1 is a cross-sectional structural diagram of a space-cooled bearing shaft system mechanism according to an embodiment of the present application, with reference to Figure 1 As shown, the spatial cold standby bearing shaft system mechanism of this embodiment includes: a shaft system assembly 1, including a main shaft 101, a main bearing assembly 12, a backup bearing assembly 13 and a sleeve 110; in the first shaft system diameter assembly mode: the backup bearing assembly 13, the sleeve 110, and the main bearing assembly 12 are arranged layer by layer on the outer surface of the main shaft 101 from the inside to the outside.

[0041] Figure 3is a schematic diagram of a locking and releasing assembly in an embodiment of the present application, with reference to Figures 1 to 3 As shown, the spatial cold standby bearing shaft system mechanism also includes: a locking and releasing assembly 2, including a first locking part 201, a swing locking part 202 and a locking seat 203, the first locking part 201 is connected to the sleeve 110, and the locking seat 203 is connected to the main shaft 101; in the main bearing assembly working mode: the first locking part 201 and the locking seat 203 are connected by the swing locking part 202 to lock each other; in the backup bearing assembly working mode: the swing locking part 202 rotates to separate the first locking part 201 and the locking seat 203 to unlock; a load assembly 3, connected to the shaft assembly 1, and the shaft assembly 1 is used to drive the load assembly 3 to move.

[0042] Exemplarily, the first locking portion 201 and the swing locking portion 202 can be set to a block shape, so that the first locking portion 201 is equivalent to the upper locking block, and the swing locking portion 202 is equivalent to the swing locking block. The first locking portion 201 and the locking seat 203 are both provided with mounting holes, and the main shaft 101, the sleeve 110, and the load assembly 3 are all provided with threaded holes corresponding to the mounting holes, which can provide positioning and installation functions for the locking seat 203 and the first locking portion 201. The locking release assembly 2 can be connected to the shaft assembly 1 through mounting holes and threaded holes. The load assembly 3 is installed on the outer ring of the bearing, and the load assembly 3 can be set as a U-shaped frame for a two-dimensional turntable for spatial tracking and aiming. In actual applications, the load assembly 3 can be replaced with other types of loads according to specific task requirements, and this application does not impose any restrictions.

[0043] The technical solution of the present application is to set up a main bearing assembly 12 and a backup bearing assembly 13, so that when the main bearing assembly 12 fails to work normally, it can be switched to the backup bearing assembly 13; in actual applications, according to different shaft diameter requirements, the first shaft diameter assembly mode or the second shaft diameter assembly mode can be freely selected.

[0044] The present application realizes bearing backup by connecting the bearing assembly in parallel with the locking and releasing assembly 2. Under normal conditions, the first locking part 201 and the locking seat 203 are locked with each other. At this time, the backup bearing assembly 13 is locked and cannot rotate, and the main bearing assembly 12 can rotate normally. When the main bearing assembly 12 reaches the end of its life or a stuck fault occurs, the first locking part 201 and the locking seat 203 are separated and unlocked, and the outer ring of the backup bearing assembly 13 is released. At this time, the backup bearing assembly 13 can drive the load assembly 3 to continue to rotate, which can ensure that the spacecraft can perform its on-orbit mission normally. The present application can greatly improve the service life and reliability of the bearing and extend the on-orbit service time of the spacecraft.

[0045] refer to Figure 2As shown, in some embodiments, the backup bearing assembly 13 includes: a first backup bearing 102, a second backup bearing 105, a backup bearing spacer 109 and a backup bearing pressure ring 106; in the first shaft system diameter assembly mode: the first backup bearing 102, the backup bearing spacer 109, the second backup bearing 105, and the backup bearing pressure ring 106 are stacked on the main shaft 101 from bottom to top. Exemplarily, the first backup bearing 102 is equivalent to the lower backup bearing, and the second backup bearing 105 is equivalent to the upper backup bearing. The backup bearing spacer 109 has the functions of controlling the gap between bearings, preventing bearing deformation and reducing bearing wear. The backup bearing pressure ring 106 can play the role of fixing the bearing.

[0046] In some embodiments, the main bearing assembly 12 includes: a first main bearing 103, a second main bearing 104, a main bearing spacer 108, and a main bearing pressure ring 107; in the first shaft system diameter assembly mode: the first main bearing 103, the main bearing spacer 108, the second main bearing 104, and the main bearing pressure ring 107 are stacked on the outer cylindrical surface of the sleeve 110 from bottom to top. Exemplarily, the first main bearing 103 is equivalent to the lower main bearing, and the second main bearing 104 is equivalent to the upper main bearing. The main bearing pressure ring 107 has the functions of controlling the gap between bearings, preventing bearing deformation, and reducing bearing wear. The main bearing pressure ring 107 can play the role of fixing the bearing.

[0047] In some embodiments, the first backup bearing 102 and the second backup bearing 105 are a pair of angular contact ball bearings arranged back to back or face to face, and / or the first main bearing 103 and the second main bearing 104 are a pair of angular contact ball bearings arranged back to back or face to face.

[0048] Continue to refer Figure 2 As shown, in some embodiments, the main shaft 101 is provided with a first positioning shoulder 1011 and a second positioning shoulder 1012; the sleeve 110 is provided with a support component 1101; in the first shaft system diameter assembly mode: the first backup bearing 102 overlaps the first positioning shoulder 1011, the backup bearing pressure ring 106 overlaps the second positioning shoulder 1012; the first main bearing 103 overlaps the support component 1101. Exemplarily, the positioning shoulder can be a protrusion or step on the main shaft 101, and the support component 1101 can be a protrusion or step on the sleeve 110. The positioning shoulder and the support component 1101 can be used for the installation and positioning of components such as bearings and bearing pressure rings. The present application is set up in this way to ensure the accurate positioning of components such as bearings on the main shaft 101 and the sleeve 110, thereby ensuring the stability and reliability of the entire shaft system mechanism.

[0049] Figure 4 is a schematic diagram of the working mode of the main bearing assembly in one embodiment of the present application, Figure 5Schematic diagram of the working mode of the backup bearing assembly in one embodiment of the present application. Figures 3 to 5 As shown, in some embodiments, the locking and releasing assembly 2 also includes: a rotating shaft 204, a torsion spring 205 and a locking member 206, the swing locking portion 202 is connected to the locking seat 203 through the rotating shaft 204, one end of the torsion spring 205 is connected to the rotating shaft 204, and the other end of the torsion spring 205 is connected to the locking seat 203, and the elastic potential energy stored in the torsion spring 205 is used to make the swing locking portion 202 rotate around the rotating shaft 204 relative to the locking seat 203.

[0050] The first locking portion 201 is provided with a first through hole (not shown), and the swing locking portion 202 is provided with a second through hole 2021. Figure 4 As shown): the locking member 206 passes through the first through hole and the second through hole 2021 to lock the first locking portion 201 and the swing locking portion 202; in the backup bearing assembly working mode (as Figure 5 As shown): the locking member 206 is disengaged from the second through hole 2021, so that the first locking portion 201 is separated from the swing locking portion 202, thereby unlocking.

[0051] refer to Figure 3 As shown, for example, the torsion spring 205 can provide power to make the swing locking part 202 fall down when unlocking, so as to prevent the first locking part 201 and the swing locking part 202 from interfering and colliding when the backup bearing assembly 13 rotates. The locking member 206 has the function of self-release after locking, and the locking member 206 can be set as a pyrotechnic bolt. In practical applications, the locking member 206 can be replaced by other components with similar functions.

[0052] refer to Figures 3 to 5 As shown, in some embodiments, in the first shaft system diameter assembly mode: in the main bearing assembly working mode: the torsion spring 205 is in an elastic potential energy storage state, the sleeve 110 and the main shaft 101 are fixed as a whole through the locking release assembly 2, the main bearing assembly 12 rotates and drives the load assembly 3 to rotate; in the backup bearing assembly working mode: the torsion spring 205 is in an elastic potential energy release state, the torsion spring 205 drives the swing locking part 202 to rotate toward the locking seat 203, the sleeve 110 and the main shaft 101 are separated, the backup bearing assembly 13 rotates and drives the sleeve 110, the main bearing assembly 12, and the load assembly 3 to rotate together.

[0053] The spatial cold standby bearing shaft system mechanism of the present application is introduced here through the first embodiment, and the first embodiment corresponds to the first shaft system diameter assembly mode. Example 1

[0054] like Figure 2As shown, the first backup bearing 102, the backup bearing spacer 109, the second backup bearing 105, and the backup bearing pressure ring 106 are sequentially installed on the main shaft 101 from bottom to top, and are positioned by the shaft shoulder designed on the main shaft 101, and together form the backup bearing assembly 13. The inner cylindrical surface of the sleeve 110 is assembled with the outer ring of the backup bearing assembly 13, and the first main bearing 103, the main bearing spacer 108, the second main bearing 104, and the main bearing pressure ring 107 are sequentially installed on the outer cylindrical surface of the sleeve 110 from bottom to top, and together form the main bearing assembly 12. The outer ring of the main bearing assembly 12 is assembled with the load assembly 3.

[0055] like Figure 3 As shown, the first locking part 201 in the locking and releasing assembly 2 is installed on the lower end surface of the sleeve 110, and the locking seat 203 is installed on the end surface of the bottom of the main shaft 101. The swing locking part 202 is installed with the locking seat 203 through the rotating shaft 204, one end of the torsion spring 205 is connected to the rotating shaft 204, and the other end of the torsion spring 205 is connected to the locking seat 203, and the swing locking part 202 can rotate relative to the locking seat 203 around the rotating shaft 204 by providing power with the stored elastic potential energy.

[0056] like Figure 4 As shown, in the normal state, the main bearing assembly 12 in the spatial cold spare bearing shaft system rotates, and the circular hole of the swing locking part 202 is aligned with the circular hole of the first locking part 201, and locked with the locking member 206. At this time, the torsion spring 205 is in a power storage state to store elastic potential energy. In this state, the sleeve 110 is fixed to the main shaft 101 as a whole, and the backup bearing assembly 13 cannot move. Only the movement of the main bearing assembly 12 drives the load assembly 3 to rotate, which is the working mode of the main bearing assembly.

[0057] like Figure 5 As shown, when the main bearing assembly 12 reaches the end of its service life or has a malfunction such as jamming, the locking member 206 is immediately unlocked, and the elastic potential energy stored in the torsion spring 205 is released to drive the swing locking portion 202 to rotate downward until it contacts the locking seat 203, and at the same time trigger the travel switch, and send a "unlocking completed, switch to backup bearing assembly working mode" signal to the ground measurement and control station via satellite. In this state, the sleeve 110 is separated from the main shaft 101, and the backup bearing assembly 13 rotates to drive the sleeve 110, the faulty main bearing assembly 12 and the load assembly 3 to rotate together, entering the backup bearing assembly working mode, and the spatial motion mechanism can work normally, and the motion mechanism will not fail due to the failure of the main bearing assembly 12. After unlocking, the swing locking portion 202 is separated from the first locking portion 201, and there is no risk of interference between the two when the backup shaft system moves.

[0058] The second embodiment of the present application (corresponding to the second shafting diameter assembly mode) will be introduced later. The functions of some components are similar to those of the first embodiment and will not be described in detail later. In the second shafting diameter assembly mode, the main bearing assembly working mode and the backup bearing assembly working mode are included.

[0059] Figure 6 is a cross-sectional structural diagram of a space-cooled bearing shaft system mechanism of another embodiment of the present application, with reference to Figure 3 and Figure 6 As shown, the spatial cold standby bearing shaft system mechanism of this embodiment includes: a shaft system assembly 1, including a main shaft 101, a main bearing assembly 12, a backup bearing assembly 13 and a sleeve 110; in the second shaft system diameter assembly mode: the main bearing assembly 12, the sleeve 110, and the backup bearing assembly 13 are arranged layer by layer on the outer surface of the main shaft 101 from the inside to the outside.

[0060] The spatial cold standby bearing shaft system mechanism also includes: a locking and releasing assembly 2, including a first locking part 201, a swing locking part 202 and a locking seat 203, the first locking part 201 is connected to the sleeve 110, and the locking seat 203 is connected to the main shaft 101; in the main bearing assembly working mode: the first locking part 201 and the locking seat 203 are connected by the swing locking part 202 and thus locked with each other; in the backup bearing assembly working mode: the swing locking part 202 rotates to separate the first locking part 201 and the locking seat 203 to unlock; a load assembly 3, connected to the shaft system assembly 1, and the shaft system assembly 1 is used to drive the load assembly 3 to move.

[0061] refer to Figure 7 As shown, in some embodiments, the backup bearing assembly 13 includes: a first backup bearing 102, a second backup bearing 105, a backup bearing spacer 109 and a backup bearing pressure ring 106; in the second shaft system diameter assembly mode: the first backup bearing 102, the backup bearing spacer 109, the second backup bearing 105, and the backup bearing pressure ring 106 are stacked in sequence from bottom to top on the outer cylindrical surface of the sleeve 110.

[0062] In some embodiments, the main bearing assembly 12 includes: a first main bearing 103, a second main bearing 104, a main bearing spacer 108, and a main bearing pressure ring 107; in the second shaft system diameter assembly mode: the first main bearing 103, the main bearing spacer 108, the second main bearing 104, and the main bearing pressure ring 107 are stacked on the main shaft 101 from bottom to top.

[0063] In some embodiments, the first backup bearing 102 and the second backup bearing 105 are a pair of angular contact ball bearings arranged back to back or face to face, and / or the first main bearing 103 and the second main bearing 104 are a pair of angular contact ball bearings arranged back to back or face to face.

[0064] Continue to refer Figure 7 As shown, in some embodiments, a first positioning shoulder 1011 and a second positioning shoulder 1012 are provided on the main shaft 101; a support component 1101 is provided on the sleeve 110; in the second shaft system diameter assembly mode: the first main bearing 103 overlaps the first positioning shoulder 1011, the main bearing pressure ring 107 overlaps the second positioning shoulder 1012; the first backup bearing 102 overlaps the support component 1101.

[0065] refer to Figure 3 and Figure 6 As shown, in some embodiments, in the second shaft system diameter assembly mode: the first locking portion 201 is also connected to the load assembly 3, the locking seat 203 is also connected to the end surface of the sleeve 110; there is a height difference between the primary bearing assembly 12 and the backup bearing assembly 13. For example, Figure 6 As shown, the height difference can be understood as the main bearing assembly 12 and the backup bearing assembly 13 are not in the same plane.

[0066] refer to Figure 3 As shown, in some embodiments, the locking and releasing assembly 2 also includes: a rotating shaft 204, a torsion spring 205 and a locking piece 206, the swing locking portion 202 is connected to the locking seat 203 through the rotating shaft 204, one end of the torsion spring 205 is connected to the rotating shaft 204, and the other end of the torsion spring 205 is connected to the locking seat 203, and the elastic potential energy stored in the torsion spring 205 is used to make the swing locking portion 202 rotate around the rotating shaft 204 relative to the locking seat 203; a first through hole (not shown) is provided on the first locking portion 201, and a second through hole 2021 is provided on the swing locking portion 202; in the main bearing assembly working mode: the locking piece 206 passes through the first through hole and the second through hole 2021 to lock the first locking portion 201 with the swing locking portion 202; in the backup bearing assembly working mode: the locking piece 206 is disengaged from the second through hole 2021 to separate the first locking portion 201 from the swing locking portion 202 and thereby unlock it.

[0067] refer to Figure 6 As shown, in some embodiments, in the second shaft system diameter assembly mode: in the main bearing assembly working mode: the torsion spring 205 is in an elastic potential energy storage state, the sleeve 110 and the load assembly 3 are fixed as a whole through the locking release assembly 2, the main bearing assembly 12 rotates and drives the sleeve 110 and the load assembly 3 to rotate together; in the backup bearing assembly working mode: the torsion spring 205 is in an elastic potential energy release state, the torsion spring 205 drives the swing locking part 202 to rotate toward the locking seat 203, the sleeve 110 and the load assembly 3 are separated, and the backup bearing assembly 13 rotates and drives the load assembly 3 to rotate.

[0068] Here, the spatial cold standby bearing shaft system mechanism of the present application is introduced through the second embodiment, and the second embodiment corresponds to the second shaft system diameter assembly mode. Example 2

[0069] like Figure 7 As shown, the first main bearing 103, the main bearing spacer 108, the second main bearing 104, and the main bearing pressure ring 107 are sequentially installed on the main shaft 101 from bottom to top, and are positioned by the shaft shoulder designed on the main shaft 101, together forming the main bearing assembly 12, and the inner cylindrical surface of the sleeve 110 is assembled with the outer ring of the main bearing assembly 12. The first backup bearing 102, the backup bearing spacer 109, the second backup bearing 105, and the backup bearing pressure ring 106 are sequentially installed on the outer cylindrical surface of the sleeve 110 from bottom to top, together forming the backup bearing assembly 13. The outer ring of the backup bearing assembly 13 is assembled with the load assembly 3.

[0070] like Figure 3 and Figure 6 As shown, the first locking part 201 in the locking and releasing assembly 2 is installed on the lower end surface of the load assembly 3, and the locking seat 203 is installed on the upper end surface of the bottom of the sleeve 110. The swing locking part 202 is installed with the locking seat 203 through the rotating shaft 204, one end of the torsion spring 205 is connected to the rotating shaft 204, and the other end of the torsion spring 205 is connected to the locking seat 203, and the swing locking part 202 can rotate around the rotating shaft 204 relative to the locking seat 203 by providing power with the stored elastic potential energy.

[0071] Under normal conditions, the main bearing assembly 12 in the spatial cold spare bearing shaft system rotates, and the circular hole of the swing locking part 202 is aligned with the circular hole of the first locking part 201 and locked with the locking member 206. At this time, the torsion spring 205 is in a power storage state to store elastic potential energy. In this state, the sleeve 110 and the load assembly 3 are fixed as a whole, and the backup bearing assembly 13 cannot move. Only the movement of the main bearing assembly 12 drives the sleeve 110 and the load assembly 3 to rotate, which is the working mode of the main bearing assembly.

[0072] When the main bearing assembly 12 reaches the end of its service life or has a malfunction such as jamming, the locking member 206 is immediately unlocked, and the elastic potential energy stored in the torsion spring 205 is released to drive the swing locking portion 202 to rotate until it contacts the locking seat 203, triggering the travel switch at the same time, and sending a "unlocking completed, switch to backup bearing assembly working mode" signal to the ground measurement and control station via satellite. In this state, the sleeve 110 is separated from the load assembly 3, and the backup bearing assembly 13 rotates to drive the load assembly 3 to rotate together, entering the backup bearing assembly working mode, and the spatial motion mechanism can work normally, and the motion mechanism will not fail due to a malfunction of the main bearing assembly 12. After unlocking, the swing locking portion 202 is separated from the first locking portion 201, and there is no risk of interference between the two when the backup shaft system moves.

[0073] The second embodiment has a compact structure and can be applied to situations where the diameter size of the space motion shaft system is limited. The main bearing has a larger diameter and higher rigidity, and can withstand a larger launch active section vibration load. The backup bearing has a smaller diameter and can carry the load assembly 3 in the space microgravity environment.

[0074] The beneficial effects that this application can produce include: (1) This application uses two sets of bearings in parallel to achieve cold standby, which can greatly increase the life of the bearings. In theory, the life of the bearing system can be at least doubled. (2) When the main bearing fails, this application can quickly switch to the backup bearing, and the rotation mechanism will not fail to work normally due to bearing failure, which can ensure that the spacecraft can perform its on-orbit mission normally. (3) This application has the advantages of simple structure and high reliability.

[0075] Although the above disclosure discusses some currently useful embodiments through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments, but rather, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of the present application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0076] Similarly, it should be noted that in order to simplify the description disclosed in this application and thus help understand one or more embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0077] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used for the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which can be changed according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the method of general digit retention. Although the numerical domains and parameters used to confirm the breadth of the range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0078] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A space-cooled bearing shafting mechanism, characterized in that: include: A shaft system assembly comprises a main shaft, a main bearing assembly, a backup bearing assembly and a sleeve; in a first shaft system diameter assembly mode: the backup bearing assembly, the sleeve and the main bearing assembly are sleeved on the outer surface of the main shaft layer by layer from the inside to the outside; or, in a second shaft system diameter assembly mode: the main bearing assembly, the sleeve and the backup bearing assembly are sleeved on the outer surface of the main shaft layer by layer from the inside to the outside; wherein the second shaft system diameter is smaller than the first shaft system diameter; The locking release assembly comprises a first locking part, a swing locking part and a locking seat, wherein the first locking part is connected to the sleeve, and the locking seat is connected to the main shaft; in the working mode of the main bearing assembly: the first locking part and the locking seat are connected by the swing locking part so as to be locked with each other; in the working mode of the backup bearing assembly: the swing locking part rotates to separate the first locking part and the locking seat so as to be unlocked; A load component is connected to the shaft system component, and the shaft system component is used to drive the load component to move.

2. The space-cooled bearing shafting mechanism according to claim 1, characterized in that: The backup bearing assembly comprises: a first backup bearing, a second backup bearing, a backup bearing spacer and a backup bearing pressure ring; In the first shaft system diameter assembly mode: the first backup bearing, the backup bearing spacer, the second backup bearing, and the backup bearing pressing ring are stacked on the main shaft in sequence from bottom to top; In the second shafting diameter assembly mode: the first backup bearing, the backup bearing spacer, the second backup bearing, and the backup bearing pressure ring are stacked in sequence from bottom to top on the outer cylindrical surface of the sleeve.

3. The space-cooled bearing shafting mechanism according to claim 2, characterized in that: The main bearing assembly comprises: a first main bearing, a second main bearing, a main bearing spacer, and a main bearing pressure ring; In the first shaft system diameter assembly mode: the first main bearing, the main bearing spacer, the second main bearing, and the main bearing pressure ring are stacked on the outer cylindrical surface of the sleeve in sequence from bottom to top; In the second shaft system diameter assembly mode: the first main bearing, the main bearing spacer, the second main bearing, and the main bearing pressure ring are stacked on the main shaft in sequence from bottom to top.

4. The space-cooled bearing shafting mechanism according to claim 3, characterized in that: The main shaft is provided with a first positioning shoulder and a second positioning shoulder; In the first shaft system diameter assembly mode: the first backup bearing overlaps the first positioning shoulder, and the backup bearing pressing ring overlaps the second positioning shoulder; In the second shaft system diameter assembly mode: the first main bearing overlaps the first locating shoulder, and the main bearing pressure ring overlaps the second locating shoulder.

5. The space-cooled bearing shafting mechanism according to claim 3, characterized in that: The sleeve is provided with a supporting component; In the first shafting diameter assembly mode: the first main bearing and the support component overlap; In the second shafting diameter assembly mode: the first backup bearing and the supporting component are overlapped.

6. The space-cooled bearing shafting mechanism according to claim 1, characterized in that: In the second shaft system diameter assembly mode: the first locking portion is also connected to the load assembly, and the locking seat is also connected to the end surface of the sleeve; there is a height difference between the main bearing assembly and the backup bearing assembly.

7. The space-cooled bearing shafting mechanism according to claim 6, characterized in that: The locking release assembly further includes: a rotating shaft, a torsion spring and a locking member, wherein the swing locking portion is connected to the locking seat via the rotating shaft, one end of the torsion spring is connected to the rotating shaft, and the other end of the torsion spring is connected to the locking seat, and the elastic potential energy stored in the torsion spring is used to make the swing locking portion rotate relative to the locking seat around the rotating shaft; the first locking portion is provided with a first through hole, and the swing locking portion is provided with a second through hole; In the working mode of the main bearing assembly: the locking member passes through the first through hole and the second through hole to lock the first locking portion with the swing locking portion; In the backup bearing assembly working mode: the locking member is disengaged from the second through hole to separate the first locking portion from the swing locking portion, thereby unlocking.

8. The space-cooled bearing shafting mechanism according to claim 7, characterized in that: In the first shafting diameter assembly mode: In the working mode of the main bearing assembly: the torsion spring is in an elastic potential energy storage state, the sleeve and the main shaft are fixed as a whole through the locking and releasing assembly, the main bearing assembly rotates and drives the load assembly to rotate; In the working mode of the backup bearing assembly: the torsion spring is in a state of elastic potential energy release, the torsion spring drives the swing locking part to rotate toward the locking seat, the sleeve and the main shaft are separated, the backup bearing assembly rotates and drives the sleeve, the main bearing assembly, and the load assembly to rotate together.

9. The space-cooled bearing shafting mechanism according to claim 7, characterized in that: In the second shafting diameter assembly mode: In the working mode of the main bearing assembly: the torsion spring is in a state of elastic potential energy storage, the sleeve and the load assembly are fixed as a whole through the locking and releasing assembly, and the main bearing assembly rotates and drives the sleeve and the load assembly to rotate together; In the backup bearing assembly working mode: the torsion spring is in a state of elastic potential energy release, the torsion spring drives the swing locking portion to rotate toward the locking seat, the sleeve and the load assembly are separated, the backup bearing assembly rotates and drives the load assembly to rotate.

10. The space-cooled bearing shafting mechanism according to claim 3, characterized in that: The first backup bearing and the second backup bearing are a pair of angular contact ball bearings arranged back to back or face to face, and / or the first main bearing and the second main bearing are a pair of angular contact ball bearings arranged back to back or face to face.

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