CN111288080A

CN111288080A - Linear bearing device

Info

Publication number: CN111288080A
Application number: CN202010243888.7A
Authority: CN
Inventors: 俞震
Original assignee: Wuxi Saibo Industry Co ltd
Current assignee: Wuxi Saibo Industry Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-06-16

Abstract

The invention discloses a linear bearing device, which comprises a guide rail, a bearing frame, a first roller and a second roller, wherein the guide rail comprises a body, the body is U-shaped, mutually symmetrical parts on the body protrude towards the inside of the guide rail to form a first track surface and a second track surface, the first track surface is a large-radius arc surface close to a plane, the second track surface is a cylindrical surface with the radius of R, the first track surface is connected with the second track surface, the outer surface of the first roller protrudes towards the outside of the roller to form a large-radius arc surface close to the plane, the outer surface of the second roller is sunken towards the inside of the roller to form an arc surface with the radius of R, the two arc surfaces are connected along the axial direction of the second roller, the first roller is matched with one guide rail, the second roller is matched with one guide rail, and the two guide rails are respectively and fixedly connected with the two sides of the bearing frame.

Description

Linear bearing device

Technical Field

The invention relates to the field of bearings, in particular to a linear bearing device.

Background

In the related prior art, the linear bearing requires small assembly error and extremely high assembly operation requirements, the size and the parallel difference of other parts for installing the guide rail and the sliding block must be strictly controlled, otherwise, the sliding is not smooth or the sliding block is blocked, but the precision requirements are difficult to guarantee by the parts in most of the occasions, or the precision is not necessary to guarantee at extremely high cost.

Disclosure of Invention

The linear bearing device provided by the embodiment of the invention comprises a guide rail, a bearing frame, a first roller and a second roller, wherein the guide rail comprises a body, the body is U-shaped, mutually symmetrical parts on the body protrude towards the inside of the guide rail to form a first track surface and a second track surface, the first track surface is a large-radius arc surface close to a plane, the second track surface is a cylindrical surface with the radius of R, the first track surface is connected with the second track surface, the outer surface of the first roller protrudes towards the outside of the roller to form a large-radius arc surface close to the plane, the outer surface of the second roller is recessed towards the inside of the roller to form an arc surface with the radius of R, and the two arc surfaces are connected along the axial direction of the second roller,

the first roller is matched with one guide rail, the second roller is matched with one guide rail, and the two guide rails are fixedly connected with the two sides of the bearing frame respectively.

According to the linear bearing device, the guide rail, the first roller and the second roller are in point contact, so that the friction force between the guide rail and the rollers is greatly reduced, and the service life of the whole linear bearing device is prolonged; in addition, the contact point between guide rail and the first gyro wheel can move on the excircle face of first gyro wheel, and the second raceway surface of guide rail also can move the contact with the circular arc face that the second gyro wheel is sunken to be formed, consequently, no matter there is the error in the horizontal direction, still has the error in the vertical direction, and first gyro wheel, second gyro wheel and guide rail and bear the frame and can both keep the structural stability of preferred.

Further, there are 1 first raceway surface and 2 second raceway surfaces, and the second raceway surfaces are symmetrically arranged with respect to the first raceway surface.

Furthermore, the circle centers of the second track surfaces are overlapped and are positioned on the central axis of the first track surface.

Furthermore, the outer surface of the first roller is in contact with the first track surface of the guide rail on one side, and the second track surface of the guide rail on the other side is in contact with the arc surface formed by the depression of the second roller.

Furthermore, the radius of a second track surface on the guide rail is R, the radius of an arc surface of the second roller is R, and R is smaller than R.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic plan view of a second roller according to an embodiment of the present invention;

FIG. 2 is a schematic plan view of a guide rail according to an embodiment of the present invention;

FIG. 3 is a schematic plan view of a first roller according to an embodiment of the present invention;

fig. 4 is a schematic plan view of a linear bearing device according to an embodiment of the present invention;

FIG. 5 is another schematic plan view of a linear bearing assembly according to an embodiment of the present invention;

fig. 6 is a schematic view of still another plan structure of the linear bearing device of the embodiment of the present invention;

fig. 7 is a further schematic plan view of a linear bearing assembly according to an embodiment of the present invention.

Detailed Description

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1 to 7, a guide rail 1 according to an embodiment of the present invention includes a U-shaped body, where symmetrical portions of the body protrude toward an inside of the guide rail to form a first track surface 2 and a second track surface 3, the first track surface 2 is a large-radius arc surface close to a plane, the second track surface 3 is a cylindrical surface with a radius r, and the first track surface 2 is connected to the second track surface 3.

In the present invention, there are 1 first raceway surface 2 and 2 second raceway surfaces 3, and the second raceway surfaces 3 are symmetrically arranged with respect to the first raceway surface 2. The centers of circles of the second rolling surfaces 3 are overlapped and are positioned on the central axis of the first rolling surface 2.

The outer surface of the first roller 4 protrudes towards the outside of the roller to form a large-radius arc surface close to a plane.

The outer surface of the second roller 5 is sunken towards the inside of the roller to form an arc surface with the radius of R, and the two arc surfaces are connected along the axis direction of the second roller.

The linear bearing device comprises a bearing frame 6, a guide rail 1, a first roller 4 and a second roller 5, wherein the first roller 4 is matched with one guide rail, the second roller 5 is matched with one guide rail, and the two guide rails are respectively and fixedly connected with the two sides of the bearing frame 6.

The outer surface of the first roller 4 contacts with the first track surface 2 of one side guide rail, and the second track surface 3 of the other side guide rail contacts with the arc surface formed by the depression of the second roller 5.

The radius of the second track surface 3 on the guide rail is R, the radius of the arc surface of the second roller 5 is R, and R is smaller than R. So, when having guaranteed second gyro wheel 5 and guide rail contact, be the point contact all the time, avoid producing the face contact to reduce the frictional force between second gyro wheel 5 and the guide rail.

In the linear bearing device, the guide rail is in point contact with the first roller 4 and the second roller 5, so that the friction force between the guide rail and the rollers is greatly reduced, and the service life of the whole linear bearing device is prolonged; in addition, the contact point between the guide rail and the first roller 4 can move on the outer circular surface of the first roller 4, and the second track surface 3 of the guide rail can also move and contact with the circular arc surface formed by the depression of the second roller 5, so that 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 bearing frame 6 can keep better structural stability.

As shown in fig. 4, when no assembly error occurs, two points at which the left second roller 5 contacts the guide rail are symmetrical with respect to the belt line of the second roller 5; the point where the right first roller 4 contacts the rail is located in the middle of the side of the first roller 4.

As shown in fig. 5, when in practice there is a deviation t1 in the horizontal direction of the right rail, the two points at which the left second roller 5 and the rail contact are symmetrical with respect to the belt line of the second roller 5; the first roller 4 on the right is in contact with the guide rail through the middle position to the right.

As shown in fig. 6, when the right guide rail has a deviation d1 in the vertical direction in practice, the upper portion of the second roller 5 on the left is in point contact with the C7 point on the right side of the guide rail, and the lower portion of the second roller 5 is in point contact with the C8 point on the left side of the guide rail; the upper part of the right first roller 4 is contacted with the guide rail through the position which is deviated from the right in the middle, the contact point is C9, and the lower part is contacted with the guide rail through the position which is deviated from the left in the middle, the contact point is C10.

When the carriage 6 is tilted at an angle α in practice, the left side of the upper part of the left second roller 5 comes into point contact with the C13 point on the left side of the guide rail, the lower part of the second roller 5 comes into point contact with the C11, C12 points of the guide rail, and the right first roller 4 comes into point contact up and down with the guide rail, as shown in fig. 7.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. Linear bearing device, characterized in that it comprises a guide rail (1), a bearing bracket (6), a first roller (4) and a second roller (5),

the guide rail comprises a U-shaped body, the symmetrical parts of the body protrude towards the inside of the guide rail to form a first track surface (2) and a second track surface (3), the first track surface is a large-radius arc surface close to a plane, the second track surface is a cylindrical surface with the radius of r, the first track surface is connected with the second track surface,

the outer surface of the first roller is convex towards the outside of the roller and is a large-radius arc surface close to a plane,

the outer surface of the second roller wheel is sunken towards the inner part of the roller wheel to form an arc surface with the radius of R, the two arc surfaces are connected along the axial direction of the second roller wheel,

2. A linear bearing assembly according to claim 1, wherein there are 1 first raceway surface and 2 second raceway surfaces, the second raceway surfaces being symmetrically disposed about the first raceway surface.

3. A linear bearing assembly according to claim 2, wherein the centres of the second race surface coincide and are located on the central axis of the first race surface.

4. The linear bearing device of claim 1, wherein the outer surface of the first roller contacts the first raceway surface of the one side rail, and the second raceway surface of the other side rail contacts the circular arc surface formed by the recess of the second roller.

5. The linear bearing assembly of claim 1 wherein the radius of the second raceway surface on the rail is R and the radius of the arcuate surface of the second roller is R, R being less than R.