Linear bearing units

Abstract

The present invention discloses a linear bearing device, comprising a guide rail, a carrier frame, a first roller and a second roller. The guide rail comprises a body, which is U-shaped. Parts on the body that are symmetrical to each other protrude toward the inside of the guide rail to form a first raceway surface and a second raceway surface. The first raceway surface is a large-radius arc surface close to a plane, and the second raceway surface is a cylindrical surface with a radius of r. The first raceway surface and the second raceway surface are connected. The outer surface of the first roller protrudes toward the outside of the roller to form a large-radius arc surface close to a plane, and the outer surface of the second roller is recessed toward the inside of the roller to form an arc surface with a radius of R. The two arc surfaces are connected along the axial direction of the second roller. The first roller cooperates with a guide rail, and the second roller cooperates with a guide rail. The two guide rails are respectively fixedly connected to two sides of the carrier frame.

Description

Technical Field

[0001] The invention relates to the field of bearings, and in particular to a linear bearing device. Background Art

[0002] In the relevant prior art, linear bearings require small assembly errors and extremely high requirements for assembly operations. The dimensions and parallelism of other components for installing guide rails and sliders must be strictly controlled, otherwise it will cause unsmooth sliding or jamming. However, it is difficult to ensure such precision requirements for components in most such occasions, or there is no need to spend a very high price to ensure such precision. Summary of the invention

[0003] The linear bearing device provided by the embodiment of the present invention comprises a guide rail, a carrier, a first roller and a second roller. The guide rail comprises a body, which is U-shaped. Parts on the body symmetrically protrude toward the inside of the guide rail to form a first raceway surface and a second raceway surface. The first raceway surface is a large-radius arc surface close to a plane, and the second raceway surface is a cylindrical surface with a radius of r. The first raceway surface and the second raceway surface are connected. The outer surface of the first roller protrudes toward the outside of the roller to form a large-radius arc surface close to a plane, and the outer surface of the second roller is recessed toward the inside of the roller to form an arc surface with a radius of R. The two arc surfaces are connected along the axis direction of the second roller.

[0004] The first roller cooperates with a guide rail, the second roller cooperates with a guide rail, and the two guide rails are respectively fixedly connected to two sides of the bearing frame.

[0005] In the linear bearing device of the present invention, point contact is implemented between the guide rail and the first roller and the second roller, which greatly reduces the friction between the guide rail and the rollers and prolongs the overall service life of the linear bearing device; in addition, the contact point between the guide rail and the first roller can move on the outer circumferential surface of the first roller, and the second raceway surface of the guide rail can also move and contact with the arc surface formed by the depression of the second roller. Therefore, no matter there is an error in the horizontal direction or an error in the vertical direction, the first roller, the second roller, the guide rail and the support frame can maintain better structural stability.

[0006] Furthermore, there is one first raceway surface and two second raceway surfaces, and the second raceway surfaces are symmetrically arranged with respect to the first raceway surfaces.

[0007] Furthermore, the center of the second raceway surface coincides with and is located on the central axis of the first raceway surface.

[0008] Furthermore, the outer surface of the first roller contacts the first raceway surface of the guide rail on one side, and the second raceway surface of the guide rail on the other side contacts the arc surface formed by the depression of the second roller.

[0009] Furthermore, the radius of the second raceway surface on the guide rail is r, the radius of the arc surface of the second roller is R, and r is smaller than R.

[0010] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description, and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0012] Figure 1 is a schematic diagram of the planar structure of the second roller according to an embodiment of the present invention;

[0013] Figure 2 is a schematic diagram of the planar structure of a guide rail according to an embodiment of the present invention;

[0014] Figure 3 is a schematic plan view of the structure of a first roller according to an embodiment of the present invention;

[0015] Figure 4 is a schematic diagram of the planar structure of a linear bearing device according to an embodiment of the present invention;

[0016] Figure 5 is another planar structural schematic diagram of the linear bearing device according to an embodiment of the present invention;

[0017] Figure 6 is another schematic plan view of the structure of the linear bearing device according to the embodiment of the present invention;

[0018] Figure 7 It is yet another planar structural schematic diagram of the linear bearing device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0019] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0020] See also Figure 1-Figure 7The guide rail 1 provided in the embodiment of the present invention includes a main body, which is U-shaped. Mutually symmetrical parts on the main body protrude into the interior of the guide rail to form a first raceway surface 2 and a second raceway surface 3. The first raceway surface 2 is a large-radius arc surface close to a plane, and the second raceway surface 3 is a cylindrical surface with a radius r. The first raceway surface 2 and the second raceway surface 3 are connected.

[0021] In the present invention, there is one first raceway surface 2 and two second raceway surfaces 3, and the second raceway surfaces 3 are symmetrically arranged with respect to the first raceway surface 2. The centers of the second raceway surfaces 3 coincide with each other and are located on the central axis of the first raceway surface 2.

[0022] The outer surface of the first roller 4 is protruding toward the outside of the roller and is a large-radius arc surface close to a plane.

[0023] The outer surface of the second roller 5 is recessed toward the inside of the roller to form an arc surface with a radius of R, and the two arc surfaces are connected along the axis direction of the second roller.

[0024] The linear bearing device includes a carrier frame 6, a guide rail 1, a first roller 4 and a second roller 5. The first roller 4 cooperates with a guide rail, and the second roller 5 cooperates with a guide rail. The two guide rails are fixedly connected to two sides of the carrier frame 6 respectively.

[0025] The outer surface of the first roller 4 contacts the first raceway surface 2 of the guide rail on one side, and the second raceway surface 3 of the guide rail on the other side contacts the arc surface formed by the depression of the second roller 5 .

[0026] The radius of the second raceway surface 3 on the guide rail is r, and the radius of the arc surface of the second roller 5 is R, where r is smaller than R. In this way, it is ensured that when the second roller 5 contacts the guide rail, it is always point contact, avoiding surface contact, thereby reducing the friction between the second roller 5 and the guide rail.

[0027] In the linear bearing device of the present invention, point contact is implemented between the guide rail and the first roller 4, and the second roller 5, which greatly reduces the friction between the guide rail and the rollers and prolongs the overall service life of the linear bearing device; in addition, the contact point between the guide rail and the first roller 4 can move on the outer circumferential surface of the first roller 4, and the second raceway surface 3 of the guide rail can also move and contact with the arc surface formed by the depression of the second roller 5. Therefore, no matter there is an error in the horizontal direction or an error in the vertical direction, the first roller 4, the second roller 5, the guide rail and the support frame 6 can maintain better structural stability.

[0028] like Figure 4 When no assembly error occurs, the two contact points between the second roller 5 on the left and the guide rail are symmetrical about the waistline of the second roller 5 ; the contact point between the first roller 4 on the right and the guide rail is located in the middle of the side surface of the first roller 4 .

[0029] like Figure 5In practice, when the right guide rail has a deviation t1 in the horizontal direction, the two points where the left second roller 5 contacts the guide rail are symmetrical about the waistline of the second roller 5; the right first roller 4 contacts the guide rail through the middle right position.

[0030] like Figure 6 In practice, when the right guide rail has a deviation of d1 in the vertical direction, the upper part of the second roller 5 on the left contacts point C7 on the right side of the guide rail, and the lower part of the second roller 5 contacts point C8 on the left side of the guide rail; the upper part of the first roller 4 on the right contacts the guide rail through the middle right position, with the contact point being C9, and the lower part contacts the guide rail through the middle left position, with the contact point being C10.

[0031] like Figure 7 In practice, when the carrier frame 6 tilts at an angle of α, the left side of the upper part of the second roller 5 on the left contacts point C13 on the left side of the guide rail, and the lower part of the second roller 5 contacts points C11 and C12 of the guide rail; the first roller 4 on the right contacts point C11 and C12 of the guide rail.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A linear bearing device, characterized in that: The invention comprises a guide rail (1), a carrier frame (6), a first roller (4) and a second roller (5), wherein the guide rail comprises a body, the body is U-shaped, mutually symmetrical parts of the body protrude toward the inside of the guide rail to form a first raceway surface (2) and a second raceway surface (3), the first raceway surface is a large radius arc surface close to a plane, the second raceway surface is a cylindrical surface with a radius r, the first raceway surface and the second raceway surface are connected, the outer surface of the first roller protrudes toward the outside of the roller to form a large radius arc surface close to a plane, the outer surface of the second roller is recessed toward the inside of the roller to form an arc surface with a radius R, the two arc surfaces are connected along the axis direction of the second roller, the first roller cooperates with a guide rail, the second roller cooperates with a guide rail, and the two guide rails are respectively fixedly connected to two sides of the carrier frame; There is one first raceway surface and two second raceway surfaces, and the second raceway surfaces are symmetrically arranged with respect to the first raceway surfaces; The outer surface of the first roller contacts the first raceway surface of the guide rail on one side, and the second raceway surface of the guide rail on the other side contacts the arc surface formed by the depression of the second roller.

2. The linear bearing device according to claim 1, characterized in that: The center of the second raceway surface coincides with and is located on the central axis of the first raceway surface.

3. The linear bearing device according to claim 1, characterized in that: The radius of the second raceway surface on the guide rail is r, the radius of the arc surface of the second roller is R, and r is smaller than R.

Images