Linear bearing

Abstract

The utility model discloses a linear bearing. The linear bearing comprises a pipe body, a plurality of concyclic first rolling pieces are arranged at one end of the pipe body, a plurality of concyclic second rolling pieces are arranged at the other end of the pipe body, the first rolling pieces and the second rolling pieces are matched to clamp a rod piece penetrating through the pipe body, and four positioning grooves evenly distributed in the circumferential direction are formed in the peripheral face of the pipe body. Ribs parallel to the axis of the pipe body are formed between the adjacent positioning grooves, one pair of ribs are horizontal ribs, and the other pair of ribs are vertical ribs. The problems that in the prior art, assembly difficulty is large, and production is not facilitated are solved.

Description

Technical Field

[0001] The utility model relates to the field of furniture manufacturing, in particular to a linear bearing. Background Art

[0002] The existing Chinese utility model patent with publication number CN218355243U and titled "An electromagnetically driven swinging iron frame" discloses that the front side of the telescopic mandrel is slidably connected to two spaced guide seats, the guide seats are fixed to the bottom plate, and the inner side of the guide seats is pivotally connected to three guide wheels. The three guide wheels evenly distributed in a circle cooperate to clamp the telescopic mandrel, and the guide wheels roll on the outer circumference of the telescopic mandrel. However, the guide seats arranged at intervals have large errors in the actual installation process. The error is accumulated by the machining error of the threaded hole on the bottom plate and the assembly error of the guide seat and the bottom plate, which makes it difficult to ensure the coaxiality of the guide seat and the reel, making assembly difficult and not conducive to production. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a linear bearing which is easy to assemble and facilitate production.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the linear bearing of the utility model is:

[0005] A linear bearing comprises a tube body, one end of which is provided with a plurality of first cocircular rolling members, and the other end of which is provided with a plurality of second cocircular rolling members, the first and second rolling members cooperate to clamp a rod member penetrating the tube body, the outer circumferential surface of the tube body is provided with four circumferentially evenly distributed positioning grooves, ribs parallel to the axis of the tube body are formed between adjacent positioning grooves, one pair of which are horizontal ribs and the other pair of which are vertical ribs.

[0006] Preferably, the centers of the circles where the first and second rolling elements are located are both located on the vertical plane where the axis of the tube body is located, and there is a height difference of 0-1 mm between the centers of the circles where the first rolling element is located and the centers of the circles where the second rolling element is located.

[0007] Preferably, at least one vertical rib or horizontal rib is provided with an error-proofing mark.

[0008] Preferably, a plurality of threaded holes are provided at both ends of the tube body, and at least one vertical rib or horizontal rib is provided with a bolt through hole.

[0009] Preferably, the first and second rolling members are rollers pivotally connected to the tube body.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] 1. A positioning groove is provided on the outer circumference of the tube body to facilitate assembly and production.

[0012] 2. The conductive coil is energized to attract the telescopic mandrel to move toward one side of the reel. The center of gravity of the telescopic mandrel is biased toward the side of the reel. At this time, the first or second rolling element on the same side as the reel and below the telescopic mandrel is subjected to greater friction and more severe wear. Therefore, a certain amount of height difference is set as the wear compensation amount of the rolling element, thereby increasing the service life of the linear bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the linear bearing of the utility model;

[0014] Figure 2 It is a top view of the linear bearing of the utility model;

[0015] Figure 3 yes Figure 2 EE cross-sectional view;

[0016] Figure 4 This is a schematic diagram of the application of linear bearings.

[0017] Among them, 10 linear bearing, 101 tube body, 102 first rolling element, 103 second rolling element, 104 positioning groove, 105 horizontal rib, 106 vertical rib, 107 anti-error mark, 108 bolt through hole, 109 threaded hole, 20 rod, 30 reel, 40 driving rod, 50 base, 501 anti-error boss, 502 positioning boss. DETAILED DESCRIPTION

[0018] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0019] like Figure 1-4As shown, a linear bearing 10 comprises a tube body 101, four co-circular and evenly distributed first rolling members 102 are installed at the left end of the tube body, and four co-circular and evenly distributed second rolling members 103 are installed at the right end of the two first rolling members of the tube body, the first and second rolling members cooperate to clamp a rod 20 passing through the tube body, the rod in this embodiment is a telescopic mandrel, the first and second rolling members are both rollers pivotally connected to the tube body, the centers of the circles where the first and second rolling members are located are both located on the vertical plane where the axis of the tube body is located, and the center of the circle where the second rolling member is located is greater than the center of the circle where the first rolling member is located. The center of the circle is 0.4mm higher. When the linear bearing is installed, the second rolling element faces the reel 30. After the conductive coil is energized, the telescopic core rod slides to one side of the reel due to gravity, and the center of gravity of the telescopic core rod is offset to one side of the reel. At this time, the second rolling element under the telescopic core rod is worn more. Therefore, the second rolling element is raised 0.4mm relative to the first rolling element as a whole as the wear compensation amount of the second rolling element under the telescopic core rod. In the early working stage, the end of the telescopic core rod that extends into the reel is slightly tilted, in the middle working stage, it is in a horizontal state, and in the later working stage, it extends into One end of the reel tilts downward until the telescopic core rod interferes with the inner wall of the reel, causing the linear bearing to fail. It can be seen that after the second rolling element is raised as a whole, the service life of the linear bearing can be improved without causing motion interference with the inner wall of the reel. Four circumferentially evenly distributed positioning grooves 104 are provided on the outer circumference of the tube body, and ribs parallel to the axis of the tube body are formed between adjacent positioning grooves, one pair of which is horizontal ribs 105, and the other pair is vertical ribs 106. An anti-error mark 107 is made on the vertical rib on the lower side, and the anti-error mark is provided on the vertical rib The anti-error groove on the rib is adjacent to one side of the second rolling element. The orientation of the second rolling element can be identified through the anti-error groove to avoid installation errors. Two bolt holes 108 are respectively provided on the two horizontal ribs, and four threaded holes 109 evenly distributed in a circle are provided at both ends of the tube body. When the driving rod 40 swings, the telescopic core rod will generate an oblique upward force on the tube body during movement. The bolt in the bolt hole is used to overcome the vertical component of the telescopic core rod, and the bolt in the threaded hole is used to overcome the horizontal component of the telescopic core rod, thereby improving the installation firmness of the tube body.

[0020] The specific working process and principle of the utility model are as follows: when the linear bearing is installed on the base 50, the anti-error groove corresponds to the anti-error boss 501 set on the base to ensure that the second rolling element faces the reel, and the positioning groove corresponds to the positioning boss 502 on the base to ensure the installation accuracy of the linear bearing, and then the tube body is fixed from the vertical direction and the horizontal direction with bolts, thereby improving the firmness of the installation of the linear bearing. The utility model can achieve precise positioning of the linear bearing when installing it by opening the positioning groove on the outer peripheral surface of the tube body, thereby facilitating installation and production. At the same time, the height difference is set between the rollers on both sides as the wear compensation amount of the roller with more wear, so as to improve the service life of the linear bearing and provide basic conditions for reducing the volume of the swing drive device.

Claims

1. A linear bearing, characterized in that: It includes a tube body, one end of the tube body is provided with a plurality of cocircular first rolling members, the other end is provided with a plurality of cocircular second rolling members, the first and second rolling members cooperate to clamp a rod member passing through the tube body, the outer peripheral surface of the tube body is provided with four circumferentially evenly distributed positioning grooves, and ribs parallel to the axis of the tube body are formed between adjacent positioning grooves, one pair of which are horizontal ribs and the other pair of which are vertical ribs.

2. The linear bearing according to claim 1, characterized in that: The centers of the circles where the first and second rolling elements are located are both located on the vertical plane where the axis of the tube body is located, and there is a height difference of 0-1mm between the centers of the circles where the first rolling element is located and the centers of the circles where the second rolling element is located.

3. The linear bearing according to claim 2, characterized in that: At least one vertical rib or horizontal rib is provided with an error-proofing mark.

4. The linear bearing according to claim 2, characterized in that: A plurality of threaded holes are provided at both ends of the tube body, and at least one vertical rib or horizontal rib is provided with a bolt through hole.

5. The linear bearing according to claim 2, characterized in that: The first and second rolling members are both rollers pivotally connected to the tube body.

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