• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a nut body for a ball screw. Further, the invention relates to a ball screw (5), comprising a threaded spindle having at least one thread having helically extending outer thread grooves for each thread, wherein adjacent outer thread grooves are separated by webs, with a nut body (20) in the inner thread grooves (21a to 21c) are arranged, the mirror-image to the outer thread grooves of the threaded spindle extending threaded parts (31a to 31c) which form with the outer thread grooves of the threaded screw helical ball raceways, in which a plurality of balls is received, and with in the nut body (20) arranged deflection devices that complement the helical ball raceways to closed ball raceways. In the wall of the nut body (20) at least one radially encircling cavity (40) for receiving a lubricant is formed, which is connected via at least one channel (42; 42 ') with at least one inner thread groove (21a to 21c).
    公开号:CH711765A2
    申请号:CH01370/16
    申请日:2016-10-13
    公开日:2017-05-15
    发明作者:Klöblen Wolfgang；Münster Bernhard
    申请人:Steinmeyer August Gmbh Co Kg；
    IPC主号:
    专利说明:

    Description: [0001] The present invention relates to a ball screw drive according to the preamble of claim 1.
    A ball screw comprises a threaded spindle, a nut and a plurality of balls. Such a ball screw is e.g. known from DE 3 930 900 A1. In the one-piece nut body deflection means are present, which complement the helical ball running channels to closed ball channels. This nut body is a solid component whose weight and mass inertia are relatively high. In addition, the life of such ball screw is not always satisfactory because especially small ball screws for space and cost reasons are delivered by the manufacturer with a so-called permanent lubrication. In various applications, this permanent lubrication is not sufficient. Relubrication of the ball screw is often impossible or very time-consuming, especially for small ball screw drives.
    The object of the invention is to provide a ball screw drive with improved dynamic properties and resilience and an increased life of the ball screw.
    The object is achieved in that at least one cavity is formed in the nut body. This cavity leads to a reduction in the dead weight and consequently lower inertia. This has a positive effect on the dynamic properties.
    If the at least one hollow dream is connected via at least one channel with at least one thread groove, it can simultaneously serve as a reservoir for receiving lubricant for lubricating the ball screw. As a result, the supply of lubricant for a consistently good lubrication of the ball screw extends over a long time and as a result, extends the life of the ball screw considerably. In some applications, a smaller size of a ball screw can be used only because of the improved lubrication without disadvantages in the load capacity and the life. This saves considerable costs, the required space is reduced as well as the inertia of the entire ball screw.
    Instead of grease, other lubricants or additives (e.g., additives or corrosion inhibitors) may also be introduced into the cavity.
    In a preferred embodiment, it is proposed that the cavity has at least one opening to the outside. This means that if necessary, lubricant can be refilled through the opening in order to continue to allow a sufficiently good lubrication of the ball screw. This can be done with very small nuts using a grease-filled syringe or grease gun.
    In addition, it is proposed that the opening is closable. Preferably, the opening is closed with a plastic plug which is pressed into the opening. Also a screw connection for locking is conceivable. This prevents lubricant from flowing out of the nut body, for example, due to the centrifugal force during the rotation.
    It is also proposed that the ball screw is designed to be more continuous. Thus, screw drives can be realized with high actuating speeds, which require a particularly good lubrication.
    It is also proposed that the nut body can be produced in a generative manufacturing process. Such manufacturing is done directly on the basis of computer-generated data models (CAD) of powder, liquids, belt-shaped or wire-shaped starting material by means of physical and / or chemical processes.
    A particular advantage of generative methods in connection with the claimed invention is that the geometry of the cavities serving as lubricant reservoirs according to the invention is subject to almost no restrictions. In addition, the cavities do not lead to an extension, but to a shortening of the production time of a novel nut, because the component requires less material.
    In addition thereto, it is proposed that the additive manufacturing process is a selective laser sintering process (SLS). In selective laser sintering, spatial structures such as e.g. the shape of the mother body with the cavity, made by sintering of a powdery starting material (metal, ceramic or plastic), wherein the workpiece is built up layer by layer. In this case, complicated geometries can be produced without much additional effort. Alternatively, the nut may also be used in a so-called 3D printer, e.g. as a stereolithography part, made of plastic.
    Alternatively, the preparation can also be effected by selective laser melting (SLM) or electron beam melting (EBM).
    Further advantages will become apparent from the following description and the accompanying drawings. In each case, in schematic form:
    Fig. 1 shows an embodiment of a known ball screw;
    Fig. 2 is an Ouerschnitt through the embodiment of Figure 1 along the line ll-ll; and
    权利要求:
    Claims (8)
    [1]
    1. nut body (20) for a ball screw (5), comprising at least one thread (21 a) and at least one optional deflection device (32 a), characterized in that in the nut body (20) at least one cavity (40) is formed.
    [2]
    2. nut body (20) according to claim 1, characterized in that the at least one cavity (40) for receiving a lubricant is formed, and that the at least one cavity (40) via at least one channel (42; 42) with at least one thread (21a) is connected.
    [3]
    3. nut body (20) according to claim 1 or 2, characterized in that the cavity (40) has at least one opening (44) to the outside.
    [4]
    4. nut body (20) according to claim 3, characterized in that the opening (44) is closable.
    [5]
    5. nut body (20) according to any one of the preceding claims, characterized in that deroder the cavities (40) are arranged annularly and / or concentrically with the thread (21 a).
    [6]
    6. nut body (20) according to any one of the preceding claims, characterized in that the nut body (20) can be produced by a generative manufacturing process.
    [7]
    7. ball screw (5) according to claim 6, characterized in that the additive manufacturing process is a selective laser sintering method, stereolithography, selective laser melting (SLM) or electron beam melting (EBM).
    [8]
    8. A ball screw (5) comprising a threaded spindle (10), a nut body (20) and a plurality of balls (22), characterized in that the nut body (20) is a nut body according to one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    CH711765B1|2020-12-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015222036|2015-11-10|
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