KR102321403B1 - Rolling element guide of linear motion bearing - Google Patents

Abstract

The present invention relates to a rolling element guide of a linear motion bearing, and more particularly, in the rolling element guide of a linear motion bearing including a linear structure on both sides and a circulation structure in which both ends are connected to the linear structure, the rolling element of the circulation structure The outer profile disposed on the outside includes a first curved portion connected to the linear structure and having a curvature, a linear portion connected to the first curved portion, and a second curved portion connected to the linear portion and having a curvature, wherein the first The curved part includes a first arc, a second arc, and a third arc, which are three arcs having different curvatures, and the second curved part includes at least one arc, wherein the first arc, the second arc, and the third arc are It relates to a rolling element guide of a linear motion bearing that is connected to each other without an inflection point, and the difference between the input distance and the output distance of the rolling element is close to '0' during circulation of the rolling element by the above configuration.

Description

Rolling element guide of linear motion bearing

The present invention relates to a rolling element guide for a linear motion bearing, and more particularly, to a rolling element guide for a linear motion bearing without an inflection point in a circulation structure.

In general, a linear guide is installed in a part where sliding motion is required to linearly guide an object from a standard position to a target position, such as industrial machine tools, robots, automatic tool changers, and various general machines.

The linear guide largely includes a block on which the object is placed, an end plate coupled to both ends of the block, a rail on which the block slides, and a rolling element disposed between the block and the track of the rail to perform rolling motion.

As disclosed in Korean Patent Registration No. 10-0891321 (Patent Document 1) previously applied by the applicant, a plurality of the rolling elements are arranged in a row to support the load between the rail and the block track inside the block, and the infinite cycle trajectory movement will do

The reason that such infinite circulating motion is possible is due to the guide adopting the structure in which the rolling element can circulate.

When the rolling elements circulate in the guide, a difference between the input distance and the output distance of the rolling elements is generated by a function of the circulation structure itself. At this time, when the difference between the input distance and the output distance approaches zero, that is, close to '0', the rolling element can perform a smooth rolling motion without energy loss.

Specifically, in the prior art, there are a guide 10 of a single R structure and a guide 20 of a Semi-R structure shown in FIGS. 6 and 7 , respectively.

,

분력들을 도시하였다.6 and 7, generated in the rolling element 30 during circulation

,

The components are shown.

The guide 10 of the single R structure includes a circular structure 13 having a straight structure 11 connected at both ends and an outer profile formed of a single arc (OR).

The guide 20 of the Semi-R structure includes a circulation structure 23 having a linear structure 21 connected at both ends and an outer profile formed of two arcs SR and a straight portion SL.

In this prior art, as the rolling element passes through the circulation structure (OR or SR), the distance difference between the moving distance 'A' (the first curved part) and the moving distance 'B' (the second curved part) of the rolling element 30 occurs. will do

This difference occurs because when the rolling element enters a circular arc (OR or SR), the trajectory connecting the center points of the rolling element and a different point come into contact with each other and move with each other rolling motion. For example, in the straight section 11, the mutual movement distance of the rolling elements spaced apart from each other will be the same. This is because the point where the rolling elements are in contact with each other is precisely in contact with the trajectory connecting the center points of the rolling elements and is rolling. Therefore, according to the trajectory function of the circular structure (OR or SR), the gap between the movement distance A and the movement distance B may widen or may approach “0”.

[Table 1] and [Table 2] show examples of data on the distance difference between the moving distances 'A', 'B', and 'A' and 'B'. The unit of data is mm.

Table 1 is data in case of single R, and Table 2 is data in case of SEMI-R.

travel distance A travel distance B Distance difference B-A 0.5 0.482 -0.018 1.0 0.970 0.030 1.5 1.600 0.100 2.0 2.005 0.005 2.5 2.487 -0.013 3.0 2.992 -0.008

travel distance A travel distance B Distance difference B-A 0.5 0.488 -0.012 1.0 0.986 -0.014 1.5 1.502 0.002 2.0 2.026 0.026 2.5 2.506 0.006 3.0 3.088 -0.012

As can be seen from [Table 1], in the case of a single R, the movement distance difference occurs up to 0.1mm, so it is a structure in which torque and repulsive force between rolling elements are generated greatly in the circulation structure of rolling elements.

As can be seen from [Table 2], there is a SEMI-R structure with an improved structure than the single R technology, but this structure also has a movement distance difference of up to 0.026mm.

Due to the above difference, an impact load is generated between the rolling elements 30 in the circulation structure, thereby causing damage to parts and rotational resistance. This ultimately leads to a decrease in the life of the linear motion bearing and an increase in torque.

Specifically, when 'B' is smaller than the moving distance 'A', it means that an energy loss of 'B'-'A' has occurred, and the rolling element 30 collides with the inflection point, or the circulation structure 13, 23 ), it can be understood that heat generation and mutual repulsive force between the rolling elements 30 are generated, resulting in loss of friction or heat, etc., preventing smooth rolling motion of the rolling elements 30 . In addition, when 'B' is greater than 'A', it means that the gap between the rolling elements 30 is generated, and it can be seen that the impact load between the rolling elements 30 is generated as much as the gap. This phenomenon is a problem that continuously occurs between the rolling elements 30 performing infinite trajectory motion. Heat generation, increase in torque, and damage to parts such as end plates are caused in the linear motion bearing, ultimately reducing the life of the linear motion bearing. it will be done

Korean Patent Registration No. 10-0891321 (2009.03.25)

An object of the present invention is to provide a rolling element guide of a linear motion bearing in which the difference between the input distance and the output distance of the rolling element is close to '0' during circulation of the rolling element.

Another object of the present invention is to provide a rolling element guide of a linear motion bearing having a circulation structure without an inflection point while adopting a Multi-R structure.

Another object of the present invention is to provide a rolling element guide of a linear motion bearing having a circulation structure in which rolling resistance is minimized.

In the rolling element guide of the linear motion bearing of the present invention for achieving the above object, the rolling element guide of the linear motion bearing includes a linear structure on both sides and a circulation structure in which both ends are connected to the linear structure, among the circulation structure The outer profile disposed on the outside of the rolling element includes a first curved portion connected to the linear structure and having a curvature, a linear portion connected to the first curved portion, and a second curved portion connected to the linear portion and having a curvature. , When the first curved part is the entry part of the rolling element, the second curved part is the entry part of the rolling element, and when the first curved part is the entry part of the rolling element, the second curved part is the entry part of the rolling element , The first curved part includes a first arc, a second arc, and a third arc, which are three arcs having different radii, and the second curved part includes a fourth arc, and the second curved part includes a fourth arc on the radius of the first arc. The center point of the second circular arc is located, and the center point of the third circular arc is located on the radius line of the second circular arc.

In addition, in the rolling element guide of the linear motion bearing of the present invention, the first arc, the second arc, and the third arc are connected to each other without an inflection point.

In addition, the rolling element guide of the linear motion bearing of the present invention, the second curved portion further comprises a fifth arc having a different radius from the fourth arc, the center point of the fifth arc on the radius of the fourth arc is located

In addition, in the rolling element guide of the linear motion bearing of the present invention, when the curvatures of the first arc, the second arc, the third arc, and the fourth arc are r1, r2, r3, r4, respectively, r1 < r2 < r3 condition is satisfied, and the condition r1 ≤ r4 ≤ r3 is satisfied.

In addition, in the rolling element guide of the linear motion bearing of the present invention, when the curvatures of the first arc, the second arc, the third arc, and the fourth arc are r1, r2, r3, r4, respectively, r2 < r4 < r3 condition is satisfied, and the condition r2 < r1, r2 < r3 is satisfied.

The rolling element guide of the linear motion bearing of the present invention has the following effects.

The effect of the present invention is to provide a circulation structure that minimizes the rolling motion resistance of a rolling element by connecting a structure in which several curvatures without an inflection point are connected with a straight line while adopting a Multi-R structure for the circulation structure of the guide. . In addition, the difference between the input distance and the output distance of the rolling element, that is, 'B'-'A' can be designed close to '0'.

In addition, the present invention provides a repulsive force between each rolling element without energy loss in the circulation structure when the rolling elements are rolling when the moving distance difference of the rolling elements, that is, 'B'-'A' is close to zero, that is, '0'. In other words, the mutual impact load is minimized and a smooth rolling element circulation structure becomes possible.

In addition, in the present invention, as the resistance is minimized when the rolling element rolls, the torque reduction and the life span increase are maximized.

1 is a cross-sectional view simply showing a first embodiment of the present invention;
Figure 2 is a cross-sectional view for showing the action of the rolling element rolling of the present invention
3 is a cross-sectional view simply showing a second embodiment of the present invention;
4 is a cross-sectional view simply showing a third embodiment of the present invention;
5 is a cross-sectional view simply showing a fourth embodiment of the present invention;
6 is a cross-sectional view showing the action of rolling element rolling in the case of a single R as one of the prior art
In the case of SEMI-R as one of the prior art of FIG. 7, a cross-sectional view for showing the action of rolling elements

Among the components of the present invention to be described below, for the same components as those of the prior art, reference will be made to the above-described prior art, and a separate detailed description thereof will be omitted.

The terminology used herein is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

When an element is referred to as being “connected” or “contacted” to another element, it may be directly connected or in contact with the other element, but it is understood that other elements may exist in between. it should be

Figure 1 is a cross-sectional view simply showing a guide 100 of a first embodiment of the present invention, Figure 2 is a cross-sectional view for showing the operation when rolling the rolling element 200 of the present invention, Figure 3 is a cross-sectional view of the present invention It is a cross-sectional view simply showing the guide 100 of the second embodiment, Figure 4 is a cross-sectional view simply showing the guide 100 of the third embodiment of the present invention, Figure 5 is a guide of the fourth embodiment of the present invention ( 100) is a simplified cross-sectional view.

The present invention adopts the Multi-R structure for the circulation structure 110 of the rolling element 200, and the center point of the Multi-R has a certain rule. The specific details will be described later.

Hereinafter, the rolling element guide of the linear motion bearing of the embodiments according to the present invention will be described.

============== First embodiment ===============

The rolling element guide of the linear motion bearing of the first embodiment includes the linear structure 101 and the circulation structure 110 disposed on both sides, and the rolling element 200 guide of the linear motion bearing to form an endless circulation track In (100), in the circulation structure (110), the outer profile to which the rolling element 200 is in contact when rolling is the first curved portion 111 of the rolling element 200, the first curved portion 111 A first curved part 115 of the rolling element 200 connected to the linear part 113 and the linear part 113 is included, wherein the first curved part 111 is three arcs having different radii. a circular arc R1-1, a second circular arc R2-1, and a third circular arc R3-1, wherein the second curved portion 115 includes a fourth circular arc R4-1, The center point RC2 of the second arc R2-1 is located on the radial line L1 of the end of the first arc R1-1, and the radial line L2 of the second arc R2-1. The center point RC3 of the third circular arc R3-1 is positioned at Connected.

The center point RC2 of the second arc R2-1 is located on the boundary line of the end of the first arc R1-1, that is, on the radius line L1, the boundary line of the end of the second arc R2-1, That is, the center point RC3 of the third circular arc R3 - 1 is located on the radial line L2 .

For this reason, the present invention is formed of three Multi-Rs, there is a region that meets the straight line part, and if it is made to include the curvature of another fourth arc (R4-1), there is no inflection point, Since the fuselage 200 does not collide with the outer profile, it is possible to adopt the circulation structure 110 in which the moving distance difference BA of the rolling element 200 is zero, that is, close to '0'.

On the other hand, the guide 100 having a structure in which a plurality of rolling elements 200 can perform a rolling motion inside is configured to have a tubular shape but to have an infinite circulation track.

In this embodiment, the guide 100 has a tube shape.

The guide 100 includes the outer profile contacting the outer side of the rolling element 200 rolling by centrifugal force, the inner profile facing the outer profile, and both side surfaces connected to the outer profile and the inner profile.

On the other hand, the circulation track includes two linear structures 101 spaced apart from each other and arranged in parallel, and two circulation structures 110 arranged on both sides.

In the circular orbit, the first curved portion 111 and the second curved portion 115 are respectively connected to the two straight structures 101 .

분력들의 합이 최소화가 되어야만 한다. In the present invention, when the rolling element 200 enters the circulation structure 110 region in order for the moving distance difference BA of the rolling element 200 to approach '0', the

The sum of the components must be minimized.

분력,

분력,

분력,

분력의 합이 최소화 되어야 하는 것이다.Specifically, the first, second, fourth, and fifth rolling elements (201, 202, 204, 205) of the first rolling body 200 to the fifth rolling body (201, 202, 203, 204, 205) that have entered the region of the circulation structure 110 based on FIG.

component,

component,

component,

The sum of the components should be minimized.

Due to this, it is possible to reduce the external force repeatedly applied to parts such as the rolling element 200 or the guide 100, that is, the impact load. Due to this, it is possible to extend the life of the component and reduce the rolling resistance of the rolling element 200 . Ultimately, it is possible to maximize the life of the linear motion bearing.

과

는 도 2 상에서 전측 방향으로 작용되는 힘을 뜻하고,

,

는 도 2 상에서 후측 방향으로 작용되는 힘을 뜻한다.

class

is the force applied in the anterior direction in FIG. 2 ,

,

denotes a force applied in the rearward direction in FIG. 2 .

,

,

,

,

는 각각 제1전동체(200) 내지 제5전동체(201,202,203,204,205)에 우측 방향으로 작용되는 힘을 뜻한다.not described in FIG. 2

,

,

,

,

is a force acting in the right direction on the first rolling body 200 to the fifth rolling body (201, 202, 203, 204, 205), respectively.

The third rolling body 203 has only a force acting in the right direction.

On the other hand, the functional condition of the circulation structure 110 and the Multi-R can most ideally approximate the movement distance B-A to zero, that is, '0' when it is as follows.

First, as shown in FIG. 1, under the condition of the first embodiment, the circulation structure 110 is composed of a first arc R1-1, a second arc R2-1, and a third arc R3-1. a first curved portion 111, a straight portion 113, and a second curved portion 115 composed of a fourth arc R4-1, wherein the first arc R1-1 and the second arc R4-1 are included. When the curvatures of R2-1), the third arc (R3-1), and the fourth arc (R4-1) are r1, r2, r3, and r4, respectively, the condition r1 < r2 < r3 is satisfied, and r1 ≤ r4 ≤ r3 condition is satisfied. That is, the curvature of the second arc R2-1 is greater than the curvature of the first arc R1-1 and smaller than the curvature of the third arc R3-1, but the curvature of the fourth arc R4-1 The curvature is the same as the curvature of the first arc R1-1 or greater than the curvature of the first arc R1-1, and the curvature of the fourth arc R4-1 is the third arc R3- It is equal to the curvature of 1) or smaller than the curvature of the third arc R3-1.

On the other hand, in the case of the first embodiment, the center point RC2 of the second arc R2-1 is located on the radial line L1 of the end of the first arc R1-1, and the second arc R2 The center point RC3 of the third circular arc R3-1 is located on the radial line L2 of -1).

In other words, the center point RC2 of the second circular arc R2-1 is located on the boundary line of the first circular arc R1-1 region, that is, on the radius line L1, and the circular arc region of the second circular arc R2-1. The center point RC3 of the third circular arc R3-1 is located on the boundary line, that is, on the radius line L2.

In the first embodiment, the center point RC3 of the third arc R3-1 is disposed in front of the center point RC2 of the second arc R2-1, and the center point RC3 of the third arc R3-1 ) is disposed to the left of the center point RC2 of the second circular arc R2-1.

In addition, the center point RC2 of the second arc R2-1 is disposed in front of the center point RC1 of the first arc R1-1, and the center point RC2 of the second arc R2-1 is the second It is disposed to the left of the center point RC1 of the first arc R1-1.

============== Second embodiment ===============

As shown in FIG. 3 , in the second embodiment, compared to the first embodiment, the second curved part 115 has a radius and a radius of the fourth arc R4-2 that is a fifth arc R5-2. include

In addition, as a condition of the second embodiment, the circulation structure 110 includes a first curved portion 111 consisting of a first arc R1-2, a second arc R2-2, and a third arc R3-2, A straight line portion 113, a second curved portion 115 having a fourth arc (R4-2) and a fifth arc (R5-2), wherein the function condition is the first arc (R1-2), When the curvatures of the second arc (R2-2), the third arc (R3-2), and the fourth arc (R4-2) are r1, r2, r3, and r4, respectively, the condition r1 < r2 < r3 is satisfied and , r1 ≤ r4 ≤ r3. That is, the curvature of the second arc R2-2 is smaller than the curvature of the first arc R1-2 and larger than the curvature of the third arc R3-2, but the curvature of the fourth arc R4-2 The curvature is equal to the curvature of the first arc R1-2 or less than the curvature of the first arc R1-2, and the curvature of the fourth arc R4-2 is the third arc R3- The curvature of 2) is equal to or greater than the curvature of the third arc R3-2, and the curvature of the fourth arc R4-2 is smaller than the curvature of the fifth arc R5-2.

In addition, the fourth arc R4 - 2 is disposed farther from the straight portion 113 than the fifth arc R5 - 2 . That is, the fifth arc R5 - 2 is disposed between the straight portion 113 and the fourth arc R4 - 2 .

As in the first embodiment, the center point RC2 of the second arc R2-2 is positioned on the radial line L1 of the end of the first arc R1-2, and the second arc R2-2 ), the center point RC3 of the third circular arc R3-2 is located on the radial line L2.

Meanwhile, in the second embodiment, the center point LC5 of the fifth arc R5-2 is located on the radial line L4 of the end of the fourth arc R4-2.

Meanwhile, the positional relationship of the center point RC3 of the first arc R1-2, the second arc R2-2, and the third arc R3-2 shown in FIG. 3 is the same as that of the first embodiment, and thus is omitted. .

The center point RC4 of the fourth arc R4 - 2 is disposed behind the center point RC5 of the fifth arc R5 - 2 . In addition, the center point RC4 of the fourth arc R4 - 2 is disposed to the left of the center point RC5 of the fifth arc R5 - 2 .

Configurations and effects other than that are the same as those of the first embodiment, so they will be omitted and reference will be made to the first embodiment.

============= Third embodiment ===============

As a condition of the third embodiment shown in FIG. 4 , the circulation structure 110 has a first curved portion including a first arc R1-3, a second arc R2-3, and a third arc R3-3. 111, a straight line portion 113, and a second curved portion 115 consisting of a fourth arc R4-3, wherein the function condition is the first arc R1-3 and the second arc R2. When the curvatures of -3), the third arc (R3-3), and the fourth arc (R4-3) are r1, r2, r3, and r4, respectively, the condition r2 ≥ r4 ≥ r3 is satisfied, and r2 > r1, The condition r2 > r3 is satisfied. That is, the function condition is that the curvature of the fourth arc R4-3 is smaller than the curvature of the second arc R2-3 or equal to the curvature of the second arc R2-3, or the fourth arc The curvature of (R4-3) is greater than the curvature of the third arc (R3-3) or equal to the curvature of the third arc (R3-3), but the curvature of the first arc (R1-3) and the curvature of the third arc The curvature of the third arc R3-3 is smaller than the curvature of the second arc R2-3.

On the other hand, in the case of the third embodiment, the second arc R2 is on the radial line L1 of the end of the first arc R1-3 and on the radius L3 of the end of the third arc R3-3. The center point RC2 of -3) is located. That is, at the point where the radial line L1 of the end of the first arc R1-3 and the radial line L3 of the end of the third arc R3-3 intersect, the second arc R2-3 The center point RC2 of is located.

In other words, the center point RC2 of the second circular arc R2-3 is the boundary line of the first circular arc R1-3 region, that is, the boundary line of the circular arc region of the radius line L1 and the third circular arc R3-3, That is, it is located on the radial line L3.

The center point RC1 of the first arc R1-3 is disposed behind the center point RC3 of the third arc R3-3. Also, the center point RC1 of the first arc R1-3 is disposed to the left of the center point RC3 of the third arc R3-3.

In addition, the center point RC2 of the second arc R2-3 is disposed in front of the center point RC1 of the first arc R1-3, and the center point RC2 of the second arc R2-3 is the second It is disposed to the left of the center point RC1 of the first arc R1-3.

In the third embodiment, the first arc R1-3 and the third arc R3-3 have the same curvature.

Configurations and effects other than that are the same as those of the first embodiment, so they will be omitted and reference will be made to the first embodiment.

============= Fourth embodiment ===============

As a condition of the fourth embodiment shown in FIG. 5 , the circulation structure 110 has a first curved portion including a first arc R1-4, a second arc R2-4, and a third arc R3-4. 111, a straight line portion 113, and a second curved portion 115 having a fourth arc R4-4 and a fifth arc R5-4, wherein the function condition is the first arc R1 When the curvatures of -4), the second arc (R2-4), the third arc (R3-4), and the fourth arc (R4-4) are r1, r2, r3, and r4, respectively, r2 < r4 < r3 condition is satisfied, and the condition r2 < r1, r2 < r3 is satisfied. That is, the function conditions are the same as those of the third embodiment. That is, the curvature of the fourth arc R4-4 is less than the curvature of the second arc R2-4 or equal to the curvature of the second arc R2-4, or the fourth arc R4 - The curvature of 4) is greater than the curvature of the third arc R3-4 or equal to the curvature of the third arc R3-4, but the curvature of the first arc R1-4 and the third arc ( The curvature of R3-4) is smaller than the curvature of the second arc R2-4.

Meanwhile, the curvature r4 of the fourth arc R4-4 is smaller than the curvature r5 of the fifth arc R5-4. That is, r4 < r5.

Unlike the condition of the second embodiment, in the fourth embodiment, the fifth arc R5-4 is disposed farther from the straight line 113 than the fourth arc R4-4. That is, the fourth arc R4 - 4 is disposed between the straight portion 113 and the fifth arc R5 - 4 .

As in the third embodiment, the second arc R2 - on the radial line L1 of the end of the first arc R1-4 and on the radius L3 of the end of the third arc R3-4. The center point RC2 of 4) is located. That is, at the point where the radial line L1 of the end of the first arc R1-4 and the radial line L3 of the end of the third arc R3-4 intersect, the second arc R2-4 The center point RC2 of is located.

In other words, the center point RC2 of the second circular arc R2-4 is the boundary line of the first circular arc R1-4 region, that is, the boundary line of the circular arc region on the radial line L1 and the third circular arc R3-4, That is, it is located on the radial line L3.

Meanwhile, in the fourth embodiment, like the third embodiment, the center point RC5 of the fifth arc R5-4 is located on the radial line L4 of the end of the fourth arc R4-4.

Meanwhile, in the fourth embodiment, like the third embodiment, the center point RC1 of the first arc R1-4 is disposed behind the center point RC3 of the third arc R3-4. Also, the center point RC1 of the first arc R1-4 is disposed to the left of the center point RC3 of the third arc R3-4.

Meanwhile, in the fourth embodiment, the center point RC4 of the fourth arc R4 - 4 is disposed behind the center point RC5 of the fifth arc R5 - 4 . Also, the center point RC4 of the fourth arc R4 - 4 is disposed to the left of the center point RC5 of the fifth arc R5 - 4 .

Configurations and effects other than that are the same as those of the third embodiment, so they will be omitted and reference will be made to the third embodiment.

------------------------------------------------

The effects of the present invention appearing through the above bar are as follows.

The effect of the present invention is that the first curved portion 111 and the second curved portion 115 are connected to arcs having multiple curvatures without inflection points while adopting the Multi-R structure for the circulation structure 110 of the guide 100 . It is possible to provide a circulation structure 110 that minimizes the rolling motion resistance of the rolling element 200 by connecting the structure and the structure with the straight part 113 .

For this reason, the present invention can design the difference between the input distance and the output distance of the rolling element 200, that is, 'B'-'A', close to '0' compared to the prior art.

분력과

분력의 합력 방향, 즉 대각선 화살표 방향으로 구름운동을 할 때 저항이 최소화됨에 따라 토크의 저감 및 수명 증대가 극대화된다.At this time, when the moving distance difference of the rolling elements 200, that is, 'B'-'A' is close to zero, that is, '0', when the rolling elements 200 are rolling, the energy in the circulation structure 110 part The repulsive force between each rolling element 200 without loss, that is, the mutual impact load is minimized, so that a smooth rolling element 200 circulation structure 110 is possible. In addition, the rolling element 200 is shown in FIG.

division

When rolling motion in the direction of the resultant force of the component force, that is, in the direction of the diagonal arrow, the resistance is minimized, and the torque reduction and life span are maximized.

The following [Table 3] shows the data of the entry distance (A), the exit distance (B), and the movement distance difference 'B'-'A' according to an embodiment of the present invention.

As can be seen from [Table 3], the difference in movement distance is all displayed as '0'.

travel distance A travel distance B Distance difference B-A 0.5 0.5 0 1.0 1.0 0 1.5 1.5 0 2.0 2.0 0 2.5 2.5 0 3.0 3.0 0

On the other hand, in FIGS. 1, 3, 4 and 5, at both ends of each of the arcs R1, R2, R3, R4, R5, on a radial line extending to the center point RC1, RC2, RC3, RC4, RC5 L3, L4) are shown with dotted lines. Therefore, the length of each arc can be known.

In the above description, each circular arc R1, R2, R3, R4, and R5 was assigned the same number as in the embodiment. For example, the sign of the third arc of the first embodiment is R3-1, and the sign of the second arc of the third embodiment is R2-3.

On the other hand, when the first curved part 111 is the entry part of the rolling element 200 , the second curved part 115 is the exit part of the rolling element 200 , and the first curved part 111 is the entry part of the rolling element 200 . The second curved part 115 is the entry part of the rolling element 200 when it is the entry part of the rolling element 113 .

In the description and drawings of the above embodiments, descriptions and illustrations are made based on the assumption that the first curved part 111 is the entry part and the second curved part 115 is the exit part.

As described above, although described with reference to preferred embodiments of the present invention, those of ordinary skill in the art may vary the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. It can be implemented by changing or modifying it.

** Explanation of key symbols **
100: guide 101: straight structure
110: circulation structure 111: first curved part
113: straight part 115: second curved part
200: rolling element
A : entry distance B : exit distance
R1 : 1st arc R2 : 2nd arc
R3 : 3rd arc R4 : 4th arc
R5 : 5th arc RC1 : Center point of 1st arc
RC2 : Center point of the second arc RC3 : Center point of the third arc
RC4 : The center point of the 4th arc RC5 : The center point of the 5th arc
L1: On the radius line of the first arc L2: On the radius line of the second arc
L3 : On the radius line of the 3rd arc L4 : On the radius line of the 4th arc

Claims (5)

In the rolling element guide of a linear motion bearing including a linear structure on both sides and a circulation structure in which both ends are connected to the linear structure,
Among the circulation structures, the outer profile disposed on the outside of the rolling element is connected to the linear structure and has a first curved portion having a curvature, a linear portion connected to the first curved portion, and a second curved portion connected to the linear portion and having a curvature including a curved part,
When the first curved part is the entry part of the rolling element, the second curved part is the entry part of the rolling element, and when the first curved part is the entry part of the rolling element, the second curved part is the entry part of the rolling element,
The first curved portion includes a first arc, a second arc, and a third arc, which are three arcs having different radii,
The second curved portion includes a fourth arc,
The first arc is connected to the straight part, the third arc is connected to the straight structure, and the second arc is connected to the first and third arcs,
A center point of the second arc is located on the radius line of the first arc, and a center point of the third arc is located on the radius line of the second arc,
When the curvatures of the first arc, second arc, third arc, and fourth arc are r1, r2, r3, and r4, respectively, the condition r1 < r2 < r3 is satisfied, and the condition r1 < r4 < r3 is satisfied. Rolling element guide for linear motion bearings In the rolling element guide of a linear motion bearing including a linear structure on both sides and a circulation structure in which both ends are connected to the linear structure,
Among the circulation structures, the outer profile disposed on the outside of the rolling element is connected to the linear structure and has a first curved portion having a curvature, a linear portion connected to the first curved portion, and a second curved portion connected to the linear portion and having a curvature including a curved part,
When the first curved part is the entry part of the rolling element, the second curved part is the entry part of the rolling element, and when the first curved part is the entry part of the rolling element, the second curved part is the entry part of the rolling element,
The first curved portion includes a first arc, a second arc, and a third arc, which are three arcs having different radii,
The second curved portion includes a fourth arc,
The first arc is connected to the straight part, the third arc is connected to the straight structure, and the second arc is connected to the first and third arcs,
A center point of the second arc is located on the radius line of the first arc, and a center point of the third arc is located on the radius line of the second arc,
When the curvatures of the first arc, second arc, third arc, and fourth arc are r1, r2, r3, and r4, respectively, the condition r2 > r4 > r3 is satisfied, and the condition r2 > r1, r2 > r3 is satisfied. Rolling element guide for linear motion bearings that satisfy 3. The method of claim 1 or 2,
The first arc, the second arc, and the third arc are the rolling element guides of the linear motion bearing connected to each other without inflection points. 3. The method of claim 1 or 2,
The second curved portion further includes a fifth arc having a different radius from the fourth arc,
The fourth arc is connected to the straight structure, and the fifth arc is connected to the straight part,
Rolling element guide of a linear motion bearing in which the center point of the fifth arc is located on the radius of the fourth arc delete

Images