Linear guide rail capable of reducing passing vibration of rolling body

Abstract

The invention relates to the technical field of linear guide rails, in particular to a linear guide rail capable of reducing passing vibration of a rolling body, which comprises circulators arranged at two ends of a sliding block body, each circulator is provided with a first transition surface and a second transition surface, the first transition surface is connected with a load groove, and the section radian of the connection part is the same; the second transition surface is connected with the circular hole channel; the diameter of the rolling body is Dw, the length of the first transition surface is L, the length of the sliding block body is K, (K + 2L) / Dw = A.Dw + B.Dw, A is a positive integer, and B is a decimal number between 0.5 and 1; the return cover covers the end of the sliding block, a limiting groove opposite to the circulator is formed in the return cover, and the extension line of the curved surface of the end of the limiting groove is tangent to the channel and the circular hole channel in the sliding rail. According to the sliding block, the circulator is integrally formed at the end part of the sliding block, and the first transition surface consistent with the radian of the load channel is arranged, so that the length of the load area is prolonged, and the change of the effective number of the rolling bodies is reduced, and the periodic operation fluctuation of the sliding block is reduced.

Description

Technical Field

[0001] This application relates to the technical field of linear guides, and particularly to a linear guide that can reduce the vibration of rolling elements during passage. Background Art

[0002] In a linear guide, rolling elements circulate and roll between a slider and a slide rail, causing the slider to move along the length direction of the slide rail. During the rolling process of the rolling elements between the slider and the slide rail, the groove between the slider and the slide rail is defined as the load area. When the rolling elements of the linear guide pass from the load area to the unloaded area, every time an effective load rolling element rolls out of the load channel, due to the circumferential gap d in the load area, an effective load rolling element cannot be immediately replenished from the unloaded area, resulting in a certain lag. Consequently, the number of effective rolling elements in the load area will exhibit a periodic fluctuation of approximately 1 - 2 rolling elements, as shown in the small figures a and b in Figure 4 Therefore, on the premise that the external load remains unchanged, the force and deformation of each rolling element will change periodically, leading to periodic motion fluctuations during the operation of the entire slider. Furthermore, within different rolling cycles, the number of rolling elements bearing the load changes, resulting in different loads borne by each rolling element. Over time, the service life of the rolling elements decreases. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that in the existing linear slide rails, the number of sliders in the load area has a periodic fluctuation, resulting in different loads borne by each rolling element within different rolling cycles and a decrease in the service life of the rolling elements.

[0004] To this end, the present invention provides a linear guide that can reduce the vibration of rolling elements during passage.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] A linear guide that can reduce the vibration of rolling elements during passage, comprising:

[0007] A slider body, on which a circular hole and a load groove adapted to the groove on the slide rail are provided;

[0008] A circulator, which is arranged at both ends of the slider body. The circulator is provided with a first transition surface and a second transition surface. The first transition surface is connected to the load groove and has the same cross-sectional radian at the connection, and the second transition surface is connected to the circular hole;

[0009] Among them, the rolling elements bear loads in both the first transition surface and the load groove. The diameter of the rolling element is Dw, the length of the first transition surface is L, and the length of the slider body is K. (K + 2L) / Dw = A·Dw + B·Dw, where: A is a positive integer, and B is a decimal between 0.5 and 1;

[0010] A return cover is provided, which is arranged at the end of the slider body. A limiting groove opposite to the circulator is provided on the return cover. The extension lines of the end surface curves of the limiting groove are tangent to the grooves on the slide rail and the circular hole on the slider body respectively.

[0011] Further, both the load groove and the side of the first transition surface close to the load groove adopt Gothic grooves, and the radian of the upper and lower parts is R3 and R4 respectively.

[0012] Further, the second transition surface adopts a single circular arc cross-sectional shape, and its cross-sectional radian is R2.

[0013] Further, the side of the first transition surface close to the second transition surface is a single circular arc groove, and its radian is R2.

[0014] Further, the circulator is integrally formed with the slider body.

[0015] Further, the incident angle β of the rolling element entering the limiting groove from the load groove is less than 45°.

[0016] Further, the center line of the limiting groove is an arc of an ellipse. The extension direction of the long radius a of the elliptical arc is arranged along the length direction of the slider body.

[0017] Further, a cross-section perpendicular to the length direction of the slider body and passing through the end surface of the circular hole is defined as a reference plane. Taking the projection points of the center line of the circular hole and the center line of the groove on the slide rail on the reference plane as C1 and C2 respectively, the midpoint of the connection line of C1 and C2 is point O. The short radius of the center line of the limiting groove is b, b = OC1 = OC2, and 0.9 ≤ b / a < 0.95.

[0018] The beneficial effect of the present invention is that in this application, the circulator is integrally formed at the end of the slider body, and by setting the first transition surface with the same radian as the load groove, the length of the load area is extended, the change in the effective number of rolling elements is reduced, and thus the periodic operation fluctuation of the overall slider caused by the force change of the rolling element on the slider body is reduced.

[0019] Further, this application starts from two aspects: the contact surfaces of the inner circle of the rolling path of the rolling element with the circulator and the load groove, and the contact surfaces of the outer circle of the rolling path of the rolling element with the return cover;

[0020] By setting the extension line of the end surface of the upper limit groove of the return cover as the tangent line of the load channel and the circular channel, the injection angle β of the rolling element entering the limit groove from the load channel is less than 45°. As a result, the outer ring of the rolling element movement trajectory during each entry and exit of the return cover is a continuous path without steps, ensuring the smoothness and continuity of the rolling element operation and avoiding operation fluctuations such as lifting during the rolling element operation.

[0021] By setting a multi-segmented gradient transition surface on the circulator, the steps between the load area and the circulator, and between the circulator and the circular channel are eliminated, realizing a step-free operation path for the rolling element throughout the cycle and ensuring the smoothness of the overall operation of the slider. Brief Description of the Drawings

[0022] The present invention will be further described below with reference to the drawings and embodiments.

[0023] Figure 1 It is a schematic structural diagram of a linear guide rail that can reduce the vibration of the rolling element in the present invention.

[0024] Figure 2 It is a schematic structural diagram of the positional relationship between the slider body and the circulator in the background art and the present invention.

[0025] Figure 3 It is a schematic structural diagram of the transition groove in the present invention.

[0026] Figure 4 It is a schematic diagram of the change in the number of load rolling elements.

[0027] Figure 5 It is a schematic structural diagram of the limit groove in the present invention.

[0028] In the figure: 1. Slider body; 11. Load groove; 12. Circular channel; 2. Circulator; 21. First transition surface; 22. Second transition surface; 3. Return cover; 31. Limit groove; 4. Slide rail. Detailed Description of the Embodiment

[0029] The present invention will now be further described in detail with reference to the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These 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. Therefore, it should not be construed as a limitation to the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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 invention can be understood according to specific circumstances.

[0032] Refer to Figure 1 , 2 , a linear guide that can reduce the vibration of rolling elements passing through, includes a slider body 1, a circulator 2, and a return cover 3. A chute for cooperating with a slide rail 4 is provided on the slider body 1. The circulator 2 is arranged at two ends of the slider body 1 and on both sides of the chute. It should be noted that in this application, the circulator 2 and the slider body 1 are integrally formed by powder metallurgy process. The return cover 3 covers both ends of the slider body 1, and a limit groove 31 opposite to the circulator 2 is provided on the return cover 3.

[0033] A load groove 11 is provided on the side wall of the chute, and circular channels 12 are provided on both sides of the chute on the slider body 1. The circulator 2 is provided with a first transition surface 21 and a second transition surface 22. The first transition surface 21 and the second transition surface 22, together with the limit groove 31 on the return cover 3, form a return channel. The slider body 1 is mounted on the slide rail 4, and the groove on the slide rail 4 and the load groove 11 together form a load channel. The part of the load groove 11 in the load channel is set as a Gothic groove. The return channel is connected between the load channel and the circular channel 12. The rolling elements roll in the load channel, enter the circular channel 12 through the return channel, roll out from the circular channel 12 and then return to the load channel through the return channel at the other end, and cycle in this way.

[0034] Refer toFigure 2 sub - figure b in Figure 3 , the first transition surface 21 is connected to the load groove 11 and the cross - section radian at the connection is the same. The second transition surface 22 is connected to the circulation groove. The first transition surface 21 is set as a gradually - changing transition surface. On the side of the first transition surface 21 close to the load groove 11, the load groove 11 adopts exactly the same Gothic channel. The radian of its upper and lower parts are R3 and R4 respectively. On the side of the first transition surface 21 close to the second transition surface 22, the second transition surface 22 adopts a single - circular - arc cross - section shape, and its cross - section radian is R2, thus eliminating the step difference with the circulation groove. The radii of both the circulation groove and the circular channel 12 are R1, and R2 = R1. Thus, the rolling elements can achieve a seamless operation in the full cycle between the load channel, the return channel, and the circular channel 12, avoiding the generation of fluctuations of the rolling elements and improving the smoothness of the rolling of the rolling elements.

[0035] Furthermore, along the length direction of the slider body 1, the length of the slider body 1 is K, and the length of the first transition surface 21 is L. On the premise of ensuring that the overall length of the slider body 1 remains unchanged, it is stipulated that: (K + 2L) / the diameter Dw of the rolling element = A·Dw + B·Dw (where: A is a positive integer, and B is a decimal between 0.5 and 1).

[0036] In the existing slider body 1 (refer to Figure 2 sub - figure a in Figure 4 ), due to the step difference between the load channel and the circulator 2, the rolling elements are only effective - load rolling elements in the load channel on the slider body 1. When the rolling elements are circulating, there will be a rolling gap between the effective - load rolling elements. Therefore, the number of effective - load rolling elements will change during the circulating rolling process, and the change number is one rolling element (refer to sub - figures a and b in

[0037] Figure 4In the small figures c and d, in small figure a, the rolling gap is located between the load area and the unloaded area, and the number of rolling elements in the load area is N - 1; in small figure b, the rolling gap is located within the load area, and the number of rolling elements in the load area is N. Based on the settings of the first transition surface 21 and the second transition surface 22, and the slider body 1 and the circulator 2 are integrally formed, so that the rolling elements can bear loads on both the first transition surface 21 and the load raceway. Through the above relationship, it is ensured that the number of effective load-carrying rolling elements is greater than the number of effective rolling elements in the slider body 1 without the transition surface, and the change in the number of effective rolling elements ≤ 0.5Dw, so that the number of effective load-carrying rolling elements in the structure of the slider body 1 remains unchanged, so that the load on each effective load-carrying rolling element is the same and the load magnitude remains stable, improving the service life of the rolling elements.

[0038] Referring to Figure 5 , in the plane where the center line of the circular channel 12 and the center line of the groove on the slide rail 4 are located, the center line of the limit groove 31 on the return cover 3 is set as an arc of an ellipse. The extension lines of the end surfaces of the limit groove 31 are tangent to the groove on the slide rail 4 and the circular channel 12 respectively. The incident angle β of the rolling element entering the limit groove 31 from the load raceway is less than 45°. Further, the extension line of the curve at one end of the limit groove 31 close to the channel between the slide rail 4 and the load raceway is tangent to the groove on the slide rail 4.

[0039] The cross-section perpendicular to the length direction of the slider body 1 and passing through the end surface of the circular channel 12 is defined as the reference plane. The projection points of the center line of the circular channel 12 and the center line of the groove on the slide rail 4 on the reference plane are C1 and C2 respectively. The midpoint of the connection line of C1 and C2 is point O. The straight line set along the length direction of the slider body 1 passing through point O is defined as the reference line. The center line of the limit groove 31 is an arc of an ellipse. The major radius of the arc is set along the reference line, its major radius is a, and the minor radius is b. Among them, b = OC1 = OC2, 0.9 ≤ b / a < 0.95.

[0040] The limit groove 31 designed as an ellipse enables the rolling element to avoid running fluctuations such as lifting when entering the return channel after exiting the load raceway, and the rolling element can smoothly enter the return channel along the limit groove 31.

[0041] Taking the ideal embodiments of the present invention as the above inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A linear guide rail that can reduce the vibration of rolling elements passing through, characterized in that, including a slider body (1) provided with a circular channel (12) and a load groove (11) adapted to the groove on the slide rail (4); a circulator (2) arranged at both ends of the slider body (1), the circulator (2) being provided with a first transition surface (21) and a second transition surface (22), the first transition surface (21) being connected to the load groove (11) and having the same cross-sectional radian at the connection, and the second transition surface (22) being connected to the circular channel (12); wherein, the rolling elements bear loads on both the first transition surface (21) and the load channel, the diameter of the rolling elements is Dw, the length of the first transition surface (21) is L, the length of the slider body (1) is K, and (K + 2L) / Dw = A·Dw + B·Dw, where: A is a positive integer and B is a decimal between 0.5 and 1; a return cover (3) covering the end of the slider body (1), the return cover (3) being provided with a limit groove (31) opposite to the circulator (2), and the extension lines of the end surfaces of the limit groove (31) being tangent to the groove on the slide rail (4) and the circular channel (12) on the slider body (1) respectively.

2. The linear guide rail capable of reducing the vibration of rolling elements according to claim 1, characterized in that The load groove (11) and the side of the first transition surface (21) close to the load groove (11) adopt Gothic channels, and the radian of the upper and lower parts is R3 and R4 respectively.

3. The linear guide rail according to claim 1, which can reduce the rolling elements passing through vibration, is characterized in that, The second transition surface (22) adopts a single-arc cross-sectional shape with a cross-sectional radian of R2.

4. The linear guide rail capable of reducing the rolling elements from passing through vibration according to claim 1, wherein The side of the first transition surface (21) close to the second transition surface is a single-arc channel with a radian of R2.

5. The linear guide rail capable of reducing the rolling elements from passing through vibration according to claim 1, wherein The circulator (2) is integrally formed with the slider body (1).

6. The linear guide rail according to claim 1 that can reduce the vibration of rolling elements, characterized in that, The incident angle β of the rolling elements entering the limit groove (31) from the load groove (11) is less than 45°.

7. The linear guide rail capable of reducing the rolling elements passing through vibration according to claim 1, characterized in that, The center line of the limit groove (31) is an arc of an ellipse, and the extension direction of the long radius a of the elliptical arc is arranged along the length direction of the slider body (1).

8. The linear guide rail capable of reducing the rolling elements passing through vibration according to claim 7, characterized in that, Define the cross-section perpendicular to the length direction of the slider body (1) and passing through the end surface of the circular channel (12) as the reference plane. Take the projection points of the center line of the circular channel (12) and the center line of the groove on the slide rail (4) on the reference plane as C1 and C2 respectively. The midpoint of the connection line of C1 and C2 is point O. The short radius of the center line of the limit groove (31) is b, b = OC1 = OC2, and 0.9 ≤ b / a < 0.95.

Images