Roller type linear guide rail capable of preventing rollers from inclining

Abstract

The roller type linear guide rail comprises a rail, a sliding block and the cylindrical roller, the sliding block slides in the length direction of the rail, a rail rolling channel is formed in the rail, a sliding block rolling channel is formed in the sliding block, and the roller comprises a roller rolling face, a first roller end face and a second roller end face. The rolling surfaces of the rollers correspond to the rail rolling channels and the sliding block rolling channels respectively, and are in contact fit with the rail rolling channels and the sliding block rolling channels respectively to bear external loads of the linear guide rail; the sliding block is further provided with a flange, the flange corresponds to the first roller end face of the roller, and the first roller end face makes contact with the flange so as to guide running of the roller and prevent the roller from inclining. And the flanges are in linear contact with the end surfaces of the first rollers. According to the linear guide rail, the rollers can be stably kept not to incline, meanwhile, the contact area between the end faces of the rollers and the flanges is effectively reduced, sliding friction is reduced, and therefore the operation performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of roller linear guide rails, in particular to a roller type linear guide rail capable of preventing rollers from tilting. Background Art

[0002] The rolling element of the roller linear guide is a cylindrical roller, and the rolling surface of the roller contacts and cooperates with the rolling groove of the slider / track to bear the load. However, due to the objective existence of manufacturing and assembly errors of the roller and other parts, the force magnitude and direction of the roller during operation are a continuous variable, which will inevitably cause the roller to be skewed to varying degrees. Therefore, it is necessary to set a suitable rib on the end face of the roller to guide the operation. However, after the rib is set, the contact friction between the rib and the roller will in turn affect the operation of the roller.

[0003] Therefore, how the roller rib can effectively guide the roller to run, prevent the roller from tilting, and avoid large friction with the roller end face is a technical problem that needs to be solved urgently. At the same time, in order to ensure the consistency of manufacturing, the quantitative design of the roller length and the rib clearance, as well as the quantitative requirements for tilting, also need to be clearly defined.

[0004] See Figure 1 In the roller linear guide rail of the prior art, the roller end face rib structure design has a 90-degree design for the rib and the rolling surface. The rib and the roller end face are in close contact, and generally a distance exceeding the center of the roller end face is required to prevent the roller from tilting. Specifically, in order to ensure that the roller does not tilt, the roller end face and the rib are vertically arranged and tightly fitted, and the contact surface length is long, and generally a distance exceeding the center of the roller end face is required. In this case, the contact surface between the rib and the roller end face is large. If there is an extrusion force between the rib and the roller end face for some unknown reason, the sliding friction between the end face and the rib will affect the movement of the roller and even cause the roller to tilt. At the same time, due to the close contact, it is not easy to store the oil used for lubrication, resulting in poor contact conditions and affecting the service life. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the present invention proposes a roller-type linear guide rail with a function of preventing rollers from tilting. By designing a new roller rib structure, the roller can be stably maintained without tilting, and at the same time, the contact area between the roller end face and the rib is effectively reduced, reducing sliding friction, thereby improving operability and achieving the effect of cooling and reducing noise.

[0007] According to an embodiment of the present invention, a roller-type linear guide with a function of preventing rollers from tilting comprises a track, a slider and a cylindrical roller, the slider slides along the length direction of the track, a track rolling channel is provided on the track, a slider rolling channel is provided on the slider, the roller comprises a roller rolling surface, a first roller end surface and a second roller end surface, the roller rolling surfaces correspond to the track rolling channel and the slider rolling channel respectively, the roller rolling surfaces contact and cooperate with the track rolling channel and the slider rolling channel respectively to bear the external load of the linear guide; a rib is also provided on the slider, the rib corresponds to the first roller end surface of the roller, the first roller end surface contacts the rib to guide the operation of the roller and prevent the roller from tilting; there is a line contact between the rib and the first roller end surface.

[0008] The beneficial effect of the present invention is that the slider track roller motion rib is mainly used to guide the roller movement direction. Through structural design, the contact area between the roller end face and the rib is reduced, the sliding friction is reduced, and the skewness of the roller is significantly reduced, thereby suppressing the fluctuation of the roller's running speed and resistance, and ensuring the stability of the running accuracy; in addition, when running under high speed and high pressure conditions, the movement temperature rise of the guide rail and the generation of movement noise can be significantly reduced.

[0009] According to an embodiment of the present invention, the tangent direction at the contact point P between the rib and the first roller end surface is set to t, and the angle α between the tangent direction t and the slider rolling channel is set to α<90°.

[0010] According to an embodiment of the present invention, the portion of the rib that contacts the end surface of the first roller is an outwardly convex arc structure.

[0011] According to an embodiment of the present invention, the portion where the end surface of the first roller contacts the rib is an outwardly convex arc structure.

[0012] According to one embodiment of the present invention, the contact point between the retaining edge and the first roller end surface is set as point P, the distance between point P and the slider rolling channel is A, and the diameter of the roller is Da. Then, the relationship between the distance A and the diameter Da is: A≥1 / 2Da.

[0013] According to an embodiment of the present invention, an escape portion is further provided on the sliding block, and the escape portion corresponds to the first roller end surface of the roller.

[0014] According to one embodiment of the present invention, the width of the escape portion is set to B, and the distance from the starting edge of the escape portion to the center point O of the first roller end face is b, then the relationship between the width B and the distance b is: B≥b.

[0015] According to one embodiment of the present invention, the total length of the roller is set to L, and the relationship between the total length L and the diameter Da is: L / Da>1.6.

[0016] According to one embodiment of the present invention, a retaining frame is further included, wherein the distance between the retaining frame and the rib is W, and the diagonal length of the roller is La. The relationship between the distance W and the diagonal length La is: W / La<0.9.

[0017] According to one embodiment of the present invention, the gap between the retaining frame and the second roller end surface is set to T, then T<0.1.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the roller end face rib structure of the roller linear guide in the prior art; Figure 2 yes Figure 1 A partial enlarged view of point E in the middle; Figure 3 The structure of the roller type linear guide rail of the present invention is a schematic diagram of the roller type linear guide rail having the function of preventing the roller from tilting. Figure 1 ; Figure 4 The structure of the roller type linear guide rail of the present invention is a schematic diagram of the roller type linear guide rail having the function of preventing the roller from tilting. Figure 2 ; Figure 5 yes Figure 3 A cross-sectional view of Figure 6 yes Figure 5 A partial enlargement of the F point in the middle Figure 1 ; Figure 7 yes Figure 5 A partial enlargement of the F point in the middle Figure 2 .

[0022] The numbers in the figure are: 1, track; 2, slider; 3, roller; 31, roller rolling surface; 32, first roller end face; 33, second roller end face; 4, track rolling groove; 5, slider rolling groove; 6, rib; 7, escape part; 8, retaining frame. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms “one side”, “the other side”, “both sides”, “between”, “middle”, “upper end”, “lower end”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The roller type linear guide with roller tilt prevention function according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] The roller type linear guide rail with roller tilt prevention of the present invention comprises a track 1, a slider 2 and a cylindrical roller 3. The slider 2 slides along the length direction of the track 1. The track 1 is provided with a track rolling channel 4. The slider 2 is provided with a slider rolling channel 5. The roller 3 comprises a roller rolling surface 31, a first roller end surface 32 and a second roller end surface 33. The roller rolling surface 31 corresponds to the track rolling channel 4 and the slider rolling channel 5 respectively, and serves as a load component to bear the external load of the linear guide rail. The roller rolling surface 31 contacts and cooperates with the track rolling channel 4 and the slider rolling channel 5 respectively to bear the external load of the linear guide rail. The end face of the roller 3 contacts the rib 6 of the slider 2 to guide the movement of the roller 3 and prevent the roller 3 from tilting. Specifically, the slider 2 is also provided with a rib 6, which corresponds to the first roller end face 32 of the roller 3. The first roller end face 32 contacts the rib 6 to guide the movement of the roller 3 and prevent the roller 3 from tilting; there is a line contact between the rib 6 and the first roller end face 32.

[0033] The portion where the rib 6 contacts the end face of the roller 3 is set to be in an outward convex arc R shape, ensuring that the surface contact with the end face of the roller 3 is reduced to line contact, thereby reducing the contact area. The end face of the roller 3 can also be set to be in an outward convex arc R shape. Specifically, the portion where the rib 6 contacts the first roller end face 32 is in an outward convex arc structure. Alternatively, the portion where the first roller end face 32 contacts the rib 6 is in an outward convex arc structure.

[0034] The relationship between the distance A between the contact point between the rib 6 and the roller 3 and the slider rolling channel 5 and the diameter Da of the roller 3 satisfies: A≥1 / 2Da, that is, the anti-skew holding effect of the rib 6 on the roller 3 is guaranteed. Specifically, the contact point between the rib 6 and the first roller end face 32 is set as point P, the distance between point P and the slider rolling channel 5 is A, and the diameter of the roller 3 is Da, then the relationship between the distance A and the diameter Da is: A≥1 / 2Da.

[0035] An escape portion 7 is provided between the rib 6 and the end face of the roller 3, at a position from the center of the roller 3 to the rolling groove 5 of the slider, to further reduce the friction area between the roller 3 and the rib 6. Specifically, the slider 2 is also provided with an escape portion 7, which corresponds to the first roller end face 32 of the roller 3. The width of the escape portion 7 is set to B, and the distance from the starting edge 71 of the escape portion 7 to the center point O of the first roller end face 32 is b, then the relationship between the width B and the distance b is: B ≥ b, that is, the width B of the escape portion 7 is set to be more than 1 / 2 of the end of the roller 3.

[0036] In order to enhance the guiding and holding effect of the rib 6 on the roller 3, the tangent direction of the contact point between the rib 6 in the shape of an outer convex arc R and the end face of the roller 3 and the angle between the slider rolling channel 5 are changed to <90°, or the tangent direction of the contact point between the end face of the roller 3 in the shape of an outer convex arc R and the rib 6 and the angle between the slider rolling channel 5 are changed to <90°, preferably, it is set to about 87° through analysis. Specifically, the tangent direction at the contact point P between the rib 6 and the first roller end face 32 is set to t, and the angle α between the tangent direction t and the slider rolling channel 5 is set to α<90°.

[0037] In order to further ensure the operability of roller 3 and the consistency of manufacturing, a quantitative relationship needs to be satisfied between the length of roller 3 and the gap between the rib 6 and the inclination angle of roller 3. Specifically, the total length of roller 3 is set to L, and the relationship between the total length L and the diameter Da is: L / Da>1.6. The roller-type linear guide with roller tilt prevention function of the present invention also includes a retaining frame 8, and the distance between retaining frame 8 and rib 6 is W. The diagonal length of roller 3 is La, and the relationship between distance W and diagonal length La is: W / La<0.9. Set the gap between retaining frame 8 and the second roller end face 33 to T, then T<0.1. Thereby ensuring that the inclination angle of roller 3 is less than 1.4°.

[0038] The roller type linear guide rail of the present invention has a function of preventing the roller from tilting. The slider track roller motion rib 6 is mainly used to guide the movement direction of the roller 3. Through structural design, the contact area between the end face of the roller 3 and the rib 6 is reduced, the sliding friction is reduced, and the skewness of the roller 3 is significantly reduced, thereby suppressing the fluctuation of the running speed and resistance of the roller 3 and ensuring the stability of the running accuracy. In addition, when running at high speed and high pressure, the movement temperature rise of the guide rail and the generation of movement noise can be significantly reduced.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A roller type linear guide rail with a function of preventing rollers from tilting, comprising a track (1), a slider (2) and a cylindrical roller (3), wherein the slider (2) slides along the length direction of the track (1), the track (1) is provided with a track rolling channel (4), the slider (2) is provided with a slider rolling channel (5), the roller (3) comprises a roller rolling surface (31), a first roller end surface (32) and a second roller end surface (33), characterized in that: The roller rolling surface (31) corresponds to the track rolling groove (4) and the slider rolling groove (5) respectively, and the roller rolling surface (31) contacts and cooperates with the track rolling groove (4) and the slider rolling groove (5) respectively to bear the external load of the linear guide rail; The slider (2) is also provided with a rib (6), the rib (6) corresponding to the first roller end face (32) of the roller (3), the first roller end face (32) being in contact with the rib (6) to guide the movement of the roller (3) and prevent the roller (3) from tilting; There is line contact between the rib (6) and the first roller end surface (32).

2. The roller type linear guide rail with roller tilt prevention function as claimed in claim 1, characterized in that: The tangent direction at the contact point P between the retaining edge (6) and the first roller end surface (32) is set to t, and the angle α between the tangent direction t and the slider rolling channel (5) is set to α<90°.

3. The roller type linear guide rail with roller tilt prevention function as claimed in claim 1, characterized in that: The portion where the retaining edge (6) contacts the first roller end surface (32) is an outwardly convex arc structure.

4. The roller type linear guide rail with roller tilt prevention function as claimed in claim 1, characterized in that: The portion of the first roller end surface (32) that contacts the retaining edge (6) is an outwardly convex arc structure.

5. The roller type linear guide rail with roller tilt prevention function as claimed in claim 1, characterized in that: The contact point between the retaining edge (6) and the first roller end face (32) is set as point P, the distance between point P and the slider rolling channel (5) is A, and the diameter of the roller (3) is Da. Then, the relationship between the distance A and the diameter Da is: A≥1 / 2Da.

6. The roller type linear guide rail with roller tilt prevention function as claimed in claim 1, characterized in that: The sliding block (2) is also provided with an escape portion (7), and the escape portion (7) corresponds to the first roller end surface (32) of the roller (3).

7. The roller type linear guide rail with roller tilt prevention function as claimed in claim 6, characterized in that: The width of the escape portion (7) is set to B, and the distance from the starting edge (71) of the escape portion (7) to the center point O of the first roller end surface (32) is set to b. Then, the relationship between the width B and the distance b is: B≥b.

8. The roller type linear guide rail with roller tilt prevention function as claimed in claim 5, characterized in that: Assuming that the total length of the roller (3) is L, the relationship between the total length L and the diameter Da is: L / Da>1.

6.

9. The roller type linear guide rail with roller tilt prevention function as claimed in claim 1, characterized in that: It also includes a retaining frame (8), wherein the distance between the retaining frame (8) and the rib (6) is W, and the diagonal length of the roller (3) is La. The relationship between the distance W and the diagonal length La is: W / La<0.

9.

10. The roller type linear guide rail with roller tilt prevention function as claimed in claim 9, characterized in that: The gap between the retaining frame (8) and the second roller end surface (33) is set to T, then T<0.1.

Images