Ball screw with high rotating speed and long service life

Abstract

The utility model discloses a ball screw with high rotating speed and long service life, which comprises a lead screw, a nut and a steel ball connected between the lead screw and the nut, a circulating component is mounted in the nut, a sealing end cover is mounted on the nut, the circulating component is positioned below the sealing end cover, the tail end of the circulating component is fixed in the nut, and the steel ball is fixed in the nut. A sealing part is arranged in the sealing end cover, a buffering gap is formed between the upper surface of the circulation part and the lower surface of the sealing end cover of the sealing part, the steel ball impacts the circulation part, the tail end of the circulation part is fixed, and the front end of the circulation part moves towards the sealing end cover in the buffering gap in the axial direction under the impact force of the steel ball. According to the ball screw with the high rotating speed and the long service life, the impact of rolling body steel balls on circulating parts at the high rotating speed is effectively reduced, the service life of the circulating parts at the ends is prolonged, the machining precision of the nut axial direction and the mounting space size of the circulating parts is reduced, and the production difficulty and the production cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to a ball screw with high speed and long life. Background Art

[0002] The return circulation raceway surface and the end circulation component installation space are processed on the end face of the nut. The circulation component circulation raceway and the nut return circulation raceway are combined into a return passage. There are two situations after the circulation component is installed on the nut: the first is that the circulation component is fixed to the nut by screws or retaining rings, and the second is that the pressure plate covers the circulation component. There is a gap between the two, and the circulation component can move along the axial direction.

[0003] Disadvantages and shortcomings:

[0004] 1) When the first circulating component is fixed on the ball nut, the circulating component directly resists the impact of the steel ball, and the circulating component requires high impact resistance. Patent CN220668289U discloses a ball screw with this structure.

[0005] 2) The second type of circulating component moves between the nut and the cover. The axial movement and circumferential rotation of the circulating component affect the movement of the rolling element balls and can easily cause friction between the circulating component and the lead screw. Therefore, the dimensions of the axial and end surfaces of the nut for the circulating component installation require high-precision machining. Utility Model Content

[0006] The technical problem to be solved by the utility model is: the utility model provides a high-speed and long-life ball screw, which effectively reduces the impact of the rolling steel balls on the circulation components at high speeds, improves the life of the end circulation components, reduces the axial processing accuracy of the nut and the installation space size of the circulation components, reduces the production difficulty and reduces the production cost.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a high-speed and long-life ball screw, including a screw, a nut and a steel ball connected between the two, a circulation component is installed in the nut, a sealing end cover is installed on the nut, and the circulation component is located below the sealing end cover. It is characterized in that the tail end of the circulation component is fixed in the nut, a sealing member is provided in the sealing end cover, and a buffer gap is provided between the upper surface of the circulation component and the lower surface of the sealing end cover of the seal. The steel ball hits the circulation component, and the tail end of the circulation component is fixed, so that the front end of the circulation component is affected by the impact force of the steel ball and moves axially toward the sealing end cover in the buffer gap.

[0008] Furthermore, a sealing member is provided in the sealing end cover, and a buffer gap is provided between the upper surface of the circulation component and the lower surface of the sealing member.

[0009] Furthermore, a buffer gap between the upper surface of the circulation component and the lower surface of the sealing element is ≤0.1 mm.

[0010] Furthermore, the circulation component is moved by the impact of the steel ball, so that the upper surface of the front end of the circulation component is in contact with the lower surface of the sealing member.

[0011] Furthermore, a mounting groove is provided on the nut, and the circulation component is installed in the mounting groove. The circulation component has a raised tail wing, and the tail wing has a first positioning surface and a second positioning surface connected to each other. The first positioning surface is clearance-matched with the first groove body of the mounting groove, and the second positioning surface is clearance-matched with the second groove body of the mounting groove.

[0012] Furthermore, a gap between the first positioning surface and the first slot body is ≤0.05 mm, and a gap between the second positioning surface and the second slot body is ≤0.05 mm.

[0013] Furthermore, the circulation component is fixed in the nut mounting groove by screws.

[0014] Furthermore, the bottom surface of the circulation component is attached to the axial positioning surface on the mounting groove.

[0015] Furthermore, the circulation component is made of resin material, and a sealing member made of elastic material is provided in the sealing end cover.

[0016] Furthermore, the sealing end cover is formed integrally with a frame and a sealing member.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The high-speed and long-life ball screw of the utility model can effectively prevent the displacement of the circulating component in the W and V directions caused by the impact of the steel ball by narrowing the gap between the tail wing of the circulating component and the installation groove. The circulating component is accurately positioned to ensure the stable operation of the ball screw.

[0019] 2. The high-speed and long-life ball screw of the utility model forms a buffer gap between the upper surface of the circulation component and the lower surface of the seal. The impact caused by the steel ball causes the front end of the circulation component to move axially in the buffer gap until the circulation component collides with the seal, thereby reducing the impact force of the steel ball on the circulation component and extending the service life of the circulation component. At the same time, the use of elastic polyurethane seals and resin material circulation components can effectively reduce the impact caused by the steel ball and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1This is a three-dimensional structural diagram of the high-speed and long-life ball screw of the utility model;

[0022] Figure 2 for Figure 1 Partial exploded view;

[0023] Figure 3 It is a three-dimensional structural diagram of the nut;

[0024] Figure 4 It is a three-dimensional structural diagram of the circulation component;

[0025] Figure 5 It is a structural diagram of the nut and the circulation components;

[0026] Figure 6 Structural diagram of the nut and sealing end cover

[0027] Figure 7 This is a schematic diagram of the state of the circulation components and the sealing end cover after the steel ball hits;

[0028] In the figure: 1. screw, 2. nut, 21. mounting groove, 21a. first groove body, 21b. second groove body, 21c. axial positioning surface, 3. steel ball, 4. circulation component, 41. tail wing, 41a. first positioning surface, 41b. second positioning surface, 41c. bottom surface, 41d. upper surface, 5. sealing end cover, 51. seal, 51d. lower surface, 6. screw. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] like Figure 1 As shown, a high-speed, long-life ball screw comprises a screw 1, a nut 2, and a steel ball 3 connected therebetween. A circulation component 4 is mounted within the nut 2. A sealing end cap 5 is mounted on the nut 2. A seal 51 is provided within the sealing end cap 5. The sealing end cap 5 is integrally formed from a frame and seal 51 using a conventional injection molding process. This seal not only seals the end cap 5 but also acts as a buffer when the end plug circulation component 4 is impacted. The nut slides back and forth on the screw 1, and the steel ball 3 circulates and rolls within the circulation component 4. The above structure is a conventional structure for a ball screw and will not be described in detail here.

[0033] like Figures 2 to 4 As shown, the nut 2 is provided with a mounting groove 21, within which the recirculation component 4 is positioned. The recirculation component 4 has raised tail fins 41. The recirculation component 4 is connected to the nut 2 via screws 6, which are installed at the tail fins 41 to provide axial positioning for the end plug recirculation component 4. A gap is created between the tail fins 41 and the mounting groove 21 to limit the rotation and translation of the recirculation component 4. This improves the positioning accuracy of the recirculation raceway during ball screw operation while preventing friction between the tail of the end plug recirculation component 4 and the outer diameter of the screw 1.

[0034] The bottom surface 41c of the circulation component 4 is attached to the axial positioning surface 21c of the mounting groove 21. The clearance between the circulation component 4, the mounting groove 21, and the sealing end cover 5 is controlled so that the circulation raceway of the circulation component 4 is no higher than the axial through hole of the nut 2. This prevents the steel ball 3 from being unable to pass through the circulation raceway and prevents the ball from getting stuck.

[0035] like Figure 5As shown, the tail wing 41 has a first positioning surface 41a and a second positioning surface 41b connected to each other. The first positioning surface 41a is clearance-matched with the first groove body 21a of the mounting groove 21, and the gap between the first positioning surface 41a and the first groove body 21a of the mounting groove 21 is ≤0.05mm. This small gap can prevent the circulation component 4 from rotating along the V direction. The second positioning surface 41b is clearance-matched with the second groove body 21b of the mounting groove 21, and the gap between the second positioning surface 41b and the second groove body 21b is ≤0.05mm. This small gap can prevent the circulation component 4 from moving along the W direction, playing a role in installation and positioning of the circulation component 4. By reducing the gap between the tail wing 41 and the mounting groove 21, the circulation component 4 is positioned, the error between the center of the circulation component raceway and the nut circulation raceway is reduced, and the running trajectory of the steel ball 3 is ensured.

[0036] The circulation component 4 is made of resin material and has a certain range of elastic deformation, which can provide a certain deformation space for the circulation component 4 when it is impacted by the steel ball and has a good buffering effect.

[0037] The seal 51 is made of elastic material, and there is a buffer gap between the upper surface 41d of the circulation component 4 and the lower surface 51d of the seal 51. The buffer gap between the upper surface 41d of the circulation component 4 and the lower surface 51d of the seal 51 is ≤0.1mm. Figure 6 and Figure 7 As described above, when the head of the circulation component 4 is impacted by the steel ball, it elastically deforms toward the lower surface 51d of the seal 51, and the buffer gap between the two gradually decreases until the upper surface of the circulation component 4 impacts the lower surface 51d of the seal 51, and the gap between the two is zero. This provides sufficient cushioning for the circulation component 4, reducing the impact force of the steel ball on the circulation component 4 and extending the service life of the circulation component. When the ball screw is in operation, the steel ball impacts the head of the end plug circulation component, which moves upward and impacts the seal 51, thereby buffering and reducing the impact force. The end plug circulation component is subjected to less impact force, and the service life of the end circulation component is extended.

[0038] To sum up, the high-speed and long-life ball screw of the utility model effectively reduces the impact of the rolling steel balls on the circulation components at high speeds, improves the life of the end circulation components, reduces the axial direction of the nut and the processing accuracy of the installation space dimensions of the circulation components, reduces the production difficulty and reduces the production cost.

[0039] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this utility model. The technical scope of this utility model is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A high-speed, long-life ball screw, comprising a screw (1), a nut (2) and a steel ball (3) connected therebetween, wherein a circulation component (4) is installed in the nut (2), a sealing end cover (5) is installed on the nut (2), and the circulation component (4) is located below the sealing end cover (5), characterized in that: The tail end of the circulation component (4) is fixed in the nut (2), and a buffer gap is provided between the circulation component (4) and the sealing end cover (5). The steel ball (3) strikes the circulation component (4), and the tail end of the circulation component (4) is fixed, so that the front end of the circulation component (4) is subjected to the impact force of the steel ball (3) and moves axially in the buffer gap toward the sealing end cover (5).

2. The high-speed and long-life ball screw according to claim 1, characterized in that: A sealing member (51) is provided in the sealing end cover (5), and a buffer gap is provided between the upper surface (41d) of the circulation component (4) and the lower surface (51d) of the sealing member (51).

3. The high-speed and long-life ball screw according to claim 2, characterized in that: A buffer gap between the upper surface (41d) of the circulation component (4) and the lower surface (51d) of the sealing member (51) is ≤0.1 mm.

4. The high-speed, long-life ball screw according to claim 3, characterized in that: The circulation component (4) is moved by the impact of the steel ball (3), so that the upper surface (41d) at the front end of the circulation component (4) is in contact with the lower surface (51d) of the sealing member (51).

5. The high-speed, long-life ball screw according to claim 1, characterized in that: The nut (2) is provided with a mounting groove (21), the circulation component (4) is installed in the mounting groove (21), the circulation component (4) has a protruding tail wing (41), the tail wing (41) has a first positioning surface (41a) and a second positioning surface (41b) connected to each other, the first positioning surface (41a) is clearance-matched with a first groove body (21a) of the mounting groove (21), and the second positioning surface (41b) is clearance-matched with a second groove body (21b) of the mounting groove (21).

6. The high-speed, long-life ball screw according to claim 5, characterized in that: The gap between the first positioning surface (41a) and the first slot body (21a) is ≤0.05mm, and the gap between the second positioning surface (41b) and the second slot body (21b) is ≤0.05mm.

7. The high-speed, long-life ball screw according to claim 1, characterized in that: The circulation component (4) is fixed in the nut mounting groove (21) by means of screws (6).

8. The high-speed, long-life ball screw according to claim 7, characterized in that: The bottom surface (41c) of the circulation component (4) is attached to the axial positioning surface (21c) on the installation groove (21).

9. The high-speed, long-life ball screw according to any one of claims 1 to 8, characterized in that: The circulation component (4) is made of resin material, and a sealing member (51) made of elastic material is provided inside the sealing end cover (5).

10. The high-speed, long-life ball screw according to claim 9, characterized in that: The sealing end cover (5) is formed integrally with a frame and a sealing member (51).

Images