Rotary supporting structure and multi-stage telescopic device with same

Abstract

The utility model discloses a rotation supporting structure and a multistage telescopic device with the same, and relates to the technical field of rotation supporting used for relative rotation motion, a first groove and a second groove are respectively arranged on a first part and a second part, a plurality of rolling bodies are arranged between the first groove and the second groove, compared with a bearing, the rotation supporting structure has the advantages that the rotation supporting structure is simple in structure and convenient to use, and the service life is long. The rolling body is directly matched with the first part and the second part, an inner ring and outer ring structure of the bearing is omitted, the standard size limitation is broken through, the size adaptability is good, the design requirement of a compact structure can be met, the mounting opening communicated with the first groove is formed in the side face of the first part, the rolling body is assembled between the first groove and the second groove through the mounting opening, and the service life of the rolling body is prolonged. An additional dismounting process is not needed, operation is easy and convenient, economical efficiency is good, and wide application prospects are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotational supports for relative rotational motion, in particular to a rotational support structure and a multi-stage telescopic device having the same. Background Art

[0002] As is well known, setting a bearing between two relatively rotating components can reduce the friction coefficient during the rotation of the components, which can not only improve the rotation efficiency but also reduce the wear of the components and extend the service life of the components. Rolling bearings can convert the sliding friction between components into rolling friction and are widely used.

[0003] Rolling bearings generally include an inner ring, an outer ring, and rolling elements, which are respectively connected to the relatively rotating components through the inner ring and the outer ring. However, since the sizes of the inner and outer rings of existing rolling bearings have been standardized, designers are limited by the bearing size standards. In scenarios with a compact space, selecting a bearing will increase the structural size, and sometimes it is very difficult to design a solution that meets the requirements; in addition, the interference fit between the inner and outer rings of the bearing and the components is not convenient for disassembly and assembly.

[0004] Therefore, there is an urgent need for a rotational support structure with good size adaptability and convenient disassembly and assembly to solve the problems existing in the prior art. Summary of the Utility Model

[0005] In view of this, the utility model provides a rotational support structure, which has the advantages of good size adaptability and convenient disassembly and assembly, can meet the design requirements of a compact structure, and can at least partially solve the problems existing in the prior art. To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A rotational support structure, characterized in that it includes a first component, a second component, and a plugging member. A circular hole is provided on the end face of the first component. The second component has a rotary portion that cooperates with the circular hole. A first groove is provided on the inner peripheral surface of the circular hole of the first component, and a second groove is provided at a position corresponding to the first groove on the rotary portion of the second component. A plurality of rolling elements are provided between the first groove and the second groove. An installation port for installing the plurality of rolling elements and communicating with the first groove is provided on the side surface of the first component, and the plugging member is installed in the installation port.

[0007] Furthermore, the plugging member has a third groove, and when the plugging member is inserted into the installation port, the third groove and the first groove together form a surface that cooperates with the plurality of rolling elements.

[0008] Furthermore, the cross-section of the installation port is rectangular.

[0009] Furthermore, the installation direction of the plugging member is not perpendicular to the axial direction of the circular hole.

[0010] Furthermore, the utility model further includes a first lead screw. A threaded hole matching with the first lead screw is provided on the first component. The threaded hole communicates with and is coaxial with the circular hole. The first component is installed on the frame and is circumferentially fixed and axially movable relative to the frame. The second component has an inner hole and is circumferentially fixed and axially movable relative to the first lead screw through the inner hole.

[0011] Furthermore, a thread is provided on the outer peripheral surface of the second component, thereby constituting a second lead screw.

[0012] According to another aspect of the utility model, a multi-stage telescopic device is provided, which includes the above-mentioned rotational support structure, and further includes a first-stage telescopic structure and a second-stage telescopic structure. The first-stage telescopic structure is fixedly connected to the first component. The second-stage telescopic structure is in threaded cooperation with the second lead screw, and the second-stage telescopic structure is circumferentially fixed and axially movable relative to the first-stage telescopic structure.

[0013] The utility model has the following obvious advantages compared with the prior art:

[0014] In the utility model, a first groove and a second groove are respectively provided on the first component and the second component, and a plurality of rolling elements are provided between the first groove and the second groove. The rolling elements rotationally support the first component and the second component. Compared with the setting of bearings, the rolling elements are directly matched with the first component and the second component, omitting the inner ring and outer ring structures of the bearings, breaking through the standard size limitations, having good size adaptability, and being able to meet the design requirements of a compact structure; an installation port communicating with the first groove is provided on the side surface of the first component, and the rolling elements are assembled between the first groove and the second groove through the installation port, without the need for additional disassembly and assembly processes, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] Figure 2 is a schematic diagram of a processing method of a plugging member of the utility model;

[0017] Figure 3 is a schematic structural diagram of the connection between the first lead screw and the first component in a preferred embodiment of the utility model;

[0018] Figure 4 is a schematic structural diagram of the connection between the first lead screw and the second component in a preferred embodiment of the utility model;

[0019] Figure 5 is a schematic diagram of a partial structure in another preferred embodiment of the utility model.

[0020] Markings in the figure: 10. First component, 11. Round hole, 12. First groove, 13. Mounting opening, 14. Sealing member, 15. Third groove, 16. Threaded hole, 20. Second component, 21. Rotating part, 22. Second groove, 23. Inner hole, 24. Guide groove, 25. Torsion block, 26. Second lead screw, 30. Rolling element, 40. First lead screw, 50. Molybdenum wire, 60. Frame, 61. Guide hole, 70. First-stage telescopic structure, 80. Second-stage telescopic structure. Detailed implementation mode

[0021] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, but should not be construed as limiting the present utility model.

[0022] The present utility model will be specifically introduced below in conjunction with the drawings and specific embodiments.

[0023] As Figure 1 shown, a rotational support structure includes a first component 10, a second component 20, and a sealing member 14.

[0024] A round hole 11 is formed in the end face of the first component 10, and the second component 20 has a rotating part 21 that cooperates with the round hole 11.

[0025] An annular first groove 12 is provided on the inner peripheral surface of the round hole 11 of the first component 10, and an annular second groove 22 corresponding to the first groove 12 is provided at the position of the rotating part 21 of the second component 20. The rolling elements 30 are annularly and evenly distributed between the first groove 12 and the second groove 22 to support the first component 10 and the second component 20.

[0026] The rolling elements 30 are preferably steel balls, but of course they can also be cylinders or other shapes.

[0027] To facilitate the installation of the rolling elements 30 between the first groove 12 and the second groove 22, as Figure 1 shown, a mounting opening 13 communicating with the first groove 12 is provided on the side surface of the first component 10, and the sealing member 14 is installed in the mounting opening 13 to prevent the rolling elements 30 from escaping through the mounting opening 13.

[0028] In practice, the mounting opening 13 is also used to inject grease between the first groove 12 and the second groove 22.

[0029] It should be noted that, as Figure 1 shown, the sealing member 14 has a third groove 15. When the sealing member 14 is installed in the mounting opening 13, the third groove 15 and the first groove 12 together form a surface that cooperates with the rolling elements 30.

[0030] The cross-section of the installation opening 13 can be common shapes such as circular and triangular. Since the third groove 15 of the plugging member 14 needs to be continuous with the first groove 12, considering the convenience of orientation during matching, the balance of force during use, and the economy of production and processing, in this embodiment, the cross-section of the installation opening 13 is preferably rectangular.

[0031] In actual production, the opening process of the installation opening 13 can be laser cutting, milling, etc. In this embodiment, wire cutting process is preferably used. The plugging member 14 can be obtained from the material cut during the opening of the installation opening 13 of the first component 10 by wire cutting process. As Figure 2 shown, when the molybdenum wire 50 for wire cutting is relatively long, in order to avoid damage to the first component 10 opposite to the installation opening 13 due to cutting, the molybdenum wire 50 can be inclined to cut into the first component 10, thereby obtaining the installation opening 13. At this time, the installation direction of the plugging member 14 is not perpendicular to the axis direction of the round hole 11. This processing method is simple in operation, good in processability, and greatly saves costs.

[0032] As a further preferred solution, as Figure 3 shown, a specific application scenario of this rotational support structure is provided. It further includes a first lead screw 40. The first component 10 is provided with a threaded hole 16 that cooperates with the first lead screw 40. The threaded hole 16 is continuous and coaxial with the round hole 11. The second component 20 has an inner hole 23. The second component 20 is circumferentially fixed to the first lead screw 40 through the inner hole 23. The first component 10 is installed on the frame 60 and is circumferentially fixed to it. At this time, when the first lead screw 40 is driven to rotate by the prime mover, the first component 10 is installed on the frame 60 and is circumferentially fixed relative to the frame 60. Under the action of screw drive, the first component 10 moves axially relative to the first lead screw 40, driving the second component 20 to move axially synchronously. At the same time, because the first lead screw 40 is circumferentially fixed to the second component 20, the first lead screw 40 drives the second component 20 to rotate synchronously. Thus, through the rotation of the first lead screw 40, the first component 10 and the second component 20 move axially synchronously, and at the same time the second component 20 rotates relative to the first component 10.

[0033] Preferably, the frame is provided with a guide hole 61, and by setting the first component 10 and the guide hole 61 of the frame to have a rectangular cross-section, the outer surface of the first component 10 is restricted by the inner surface of the guide hole 61 and cannot rotate, achieving the purpose that the frame 60 axially moves and circumferentially fixes the first component 10 through the guide hole 61.

[0034] There are many ways to circumferentially fix the first lead screw 40 and the second component 20. It can be as Figure 4As shown in the figure, a guiding groove 24 is provided in the inner hole 23 of the second component 20, and a torsion block 25 that cooperates with the guiding groove 24 is provided on the first lead screw 40. Alternatively, a guiding groove can be axially formed on the outer surface of the first lead screw 40, and a limit pin is provided on the second component 20. The limit pin slides along the guiding groove of the first lead screw 40 and transmits torque to the second component 20 at the same time. Or the inner hole 23 of the second component 20 can be set to be square, and a guiding block that cooperates with the inner hole 23 of the second component 20 is provided on the first lead screw 40. The guiding block transmits the torque from the first lead screw 40 to the second component 20 while not hindering the axial movement of the second component 20.

[0035] For further transmission of motion, as Figure 5 shown, a thread is provided on the outer peripheral surface of the second component 20, thus constituting a second lead screw 26.

[0036] In addition, as Figure 5 shown, a multi-stage telescopic device capable of achieving large-stroke output in a compact space is also provided, including the above-mentioned rotational support structure, and further including a first-stage telescopic structure 70 and a second-stage telescopic structure 80. Among them, the first-stage telescopic structure 70 is fixedly connected to the first component 10, and the second-stage telescopic structure 80 is in threaded cooperation with the second lead screw 26, and the second-stage telescopic structure 80 is circumferentially fixed and axially movable relative to the first-stage telescopic structure 70.

[0037] The principle of its large-stroke output is as follows. Taking the extending movement as an example, when the first lead screw 40 rotates, the first component 10 is circumferentially restricted by the fixation of the frame 60 and axially moves relative to the first lead screw 40 under the action of screw drive, driving the first-stage telescopic structure 70 fixedly connected to the first component 10 to extend, and at the same time driving the second component 20 to move axially synchronously. At the same time, since the first lead screw 40 and the second component 20 are circumferentially fixed, the first lead screw 40 drives the second component 20 to rotate synchronously. The second-stage telescopic structure 80 is circumferentially limited by the first-stage telescopic structure 70, and thus axially extends relative to the second lead screw 26 formed on the outer peripheral surface of the second component 20.

[0038] Compared with the prior art, the present utility model has the following obvious advantages:

[0039] 1. The inner ring and outer ring structures of the bearing are omitted, breaking through the standard size limit, having good size adaptability, and being able to meet the design requirements of a compact structure.

[0040] 2. An installation port 13 communicating with the first groove 12 is provided on the side of the first component 10. The rolling elements 30 are loaded into the space between the first groove 12 and the second groove 22 through the installation port 13, without the need for additional disassembly and assembly processes, and the operation is simple and convenient.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] The above embodiments only illustrate the basic principles and characteristics of the present utility model. The present utility model is not limited by the above embodiments. Without departing from the spirit and scope of the present utility model, there are various changes and modifications to the present utility model, and these changes and modifications all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A rotating support structure, characterized in that: The invention comprises a first component, a second component and a plugging member, wherein a circular hole is provided on the end face of the first component, the second component has a rotating part matched with the circular hole, a first groove is provided on the inner circumference of the circular hole of the first component, a second groove is provided on the rotating part of the second component at a position corresponding to the first groove, a plurality of rolling bodies are provided between the first groove and the second groove, a mounting opening connected with the first groove and used for mounting the plurality of rolling bodies is provided on the side face of the first component, and the plugging member is installed at the mounting opening.

2. A rotating support structure according to claim 1, characterized in that: The blocking member has a third groove. When the blocking member is installed in the installation opening, the third groove and the first groove together form a surface that cooperates with the plurality of rolling elements.

3. A rotation support structure according to claim 2, characterized in that: The cross section of the installation opening is rectangular.

4. A rotation support structure according to claim 2, characterized in that: The installation direction of the blocking member is not perpendicular to the axial direction of the circular hole.

5. A rotation support structure according to claim 1, characterized in that: It also includes a first screw rod, the first component is provided with a threaded hole that cooperates with the first screw rod, the threaded hole is connected with the circular hole and is coaxial, the first component is installed on the frame and is fixed circumferentially and movable axially relative to the frame, and the second component has an inner hole and is fixed circumferentially and movable axially relative to the first screw rod through the inner hole.

6. A rotation support structure according to claim 5, characterized in that: The outer peripheral surface of the second component is provided with threads so as to form a second screw rod.

7. A multi-stage telescopic device, characterized in that: It includes the rotating support structure described in claim 6, and also includes a first-level telescopic structure and a second-level telescopic structure, the first-level telescopic structure is fixedly connected to the first component, the second-level telescopic structure cooperates with the second screw rod through a thread, and the second-level telescopic structure is circumferentially fixed and axially movable relative to the first-level telescopic structure.

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