Linear Motion Bearings

Abstract

To provide a linear motion bearing having an oil film lubrication structure that is simple in structure, low in cost, provides stable and smooth lubrication in motion, and has a high load capacity. [Solution] The linear motion bearing of the present invention comprises a slide base 1, a slide rail 2, a rod bearing 3, an oil reservoir 22, and a grease spring 23. One or more inner grooves are provided on the opposing surfaces of the slide rail 2 and the slide base 1, and the shape of the inner groove 21 of the slide rail 2 is symmetrical to the shape of the inner groove 11 of the slide base 1. The space between the inner groove 11 of the slide base 1 and the inner groove 21 of the slide rail 2 is an installation space for the rod bearing 3. An oil reservoir 22 is recessed into the inner groove 21 of the slide rail 2 at a predetermined depth and height, and a grease spring 23 having elasticity for expansion and contraction is installed in the oil reservoir 22. The cross-sectional shape of the rod bearing 3 is a polygonal polygon, and at least one angle of the polygonal polygon is a circular arc angle.

Description

[Technical Field]

[0001] The present invention relates to a linear motion bearing. [Background technology]

[0002] As is well known, all general linear motion bearings are constructed by combining ball bearings with slide bases and slide rails. Summary of the Invention [Problem to be solved by the invention]

[0003] However, these technical inventions have drawbacks such as a complex structure, many components, time-consuming assembly and manufacturing, high costs, and loud noise during operation. Furthermore, after a certain period of use, the ball bearings wear out, but they cannot be easily replaced, so their lifespan is limited, and their industrial applicability is relatively limited, resulting in low economic benefits.

[0004] Therefore, the inventors of the present invention believed that the above drawbacks could be improved, and after extensive research, they came up with the present invention, which effectively improves the above issues through rational design.

[0005] The present invention was developed through intensive research by the present inventor in consideration of the above problems, and its purpose is to provide a linear motion bearing having a simple oil film lubrication structure.

[0006] Another object of the present invention is to provide a linear motion bearing with an oil film lubrication structure that has a simple structure, low cost, stable and smooth motion lubrication, and a high load capacity.

[0007] A further object of the present invention is to provide a linear motion bearing with an oil film lubrication structure that has excellent lubrication, stable and smooth movement, and dust and dirt prevention properties.

[0008] A still further object of the present invention is to provide a linear motion bearing having a simple oil film lubrication structure that is highly industrially applicable and economically effective.

[0009] The present invention effectively overcomes the drawbacks of conventional linear motion bearings, such as complex structure, large number of components, time-consuming assembly, high cost, and limited lifespan. [Means for solving the problem]

[0010] To achieve the above object, a linear motion bearing according to one aspect of the present invention comprises a slide base, a slide rail, a rod bearing, an oil reservoir, and a grease spring. The opposing surfaces of the slide rail and the slide base are provided with one or more inner grooves. The shape of the inner groove of the slide rail is symmetrical to that of the inner groove of the slide base, and the space between the inner groove of the slide base and the inner groove of the slide rail is an installation space for a rod bearing. An oil reservoir is recessed in the inner groove of the slide rail at a predetermined depth and height, and a grease spring having elasticity for expansion and contraction and for restraint is installed in the oil reservoir. The cross-sectional shape of the rod bearing is a polygonal polygon, and at least one corner of the polygonal polygon is a circular arc angle. [Effects of the Invention]

[0011] The present invention is configured as described above and therefore has the following advantages. The rod bearings are installed in the opposing inner grooves of the corresponding surfaces of the slide base and slide rail, and a concave oil reservoir and grease spring are installed in the slide rail to form a practical and original structure in which a simple oil film lubrication is applied. This structure realizes a simple oil film lubrication structure for linear motion bearings that has a simple oil reservoir structure, low cost, high lubrication effect, stable and smooth motion, and dust and dirt prevention properties.

[0012] At least the following points will become clear from the description and drawings to be described later. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing the overall assembly of a slide base, a rod bearing, and a slide rail of a linear motion bearing in accordance with an embodiment of the present invention; [Figure 2] 1 is a schematic view showing a slide rail according to an embodiment of the present invention; [Figure 3] FIG. 3 is a left side view shown in FIG. 2. [Figure 4] FIG. 3 is a perspective view shown in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line BB in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line AA of the embodiment of FIG. [Figure 7] FIG. 7 is a cross-sectional view showing the embodiment of the rod bearing shown in FIG. 6. [Figure 8] 2 is a cross-sectional view of another embodiment of FIG. 1 taken along line AA. [Figure 9] FIG. 9 is a cross-sectional view showing another embodiment of the rod bearing shown in FIG. 8. [Figure 10] 10 is a schematic view showing a slide rail according to another embodiment of the present invention; [Figure 11] FIG. 11 is a left side view shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the invention according to the scope of the utility model claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0015] The linear motion bearing according to the present invention includes a slide base 1, a slide rail 2, an oil reservoir 22, a grease spring 23, and a rod bearing 3 (see FIG. 1).

[0016] As shown in the figure, one or more inner grooves 11 and 21 (V-shaped with an internal angle of 90° as shown in the figure) are provided between the opposing surfaces of the slide rail 2 and the slide base 1. The shape of the inner groove 21 of the slide rail 2 is symmetrical to the shape of the inner groove 11 of the slide base 1, and the space between the inner groove 11 of the slide base 1 and the inner groove 21 of the slide rail 2 is an installation space for the rod bearing 3.

[0017] As shown in the figure, the rod bearing 3 is a polygonal rod bearing, and is installed in the opposing inner grooves 11 and 21 on the corresponding surfaces of the slide base 1 and the slide rail 2, and the cross-sectional shape of the rod bearing 3 is a polygonal polygon. The best embodiment shown in the figure is a quadrilateral, and the cross-sectional shape of the quadrilateral in the best embodiment is a square, and at least one corner of the polygon is a circular arc angle 31 (four circular arc angles are shown as an example in Figures 8 and 9 of the present invention). The length of the rod bearing 3 is less than or equal to the length of the base of the slide base 1.

[0018] Furthermore, an oil reservoir 22 is recessed to a predetermined depth and height in the inner groove 21 of the slide rail 2, and a grease spring 23 having elasticity to expand and contract, or another grease member having the same elasticity to expand and contract, is installed in the oil reservoir 22. The outer diameter of the grease spring 23 is equal to or less than the predetermined depth and height at which the oil reservoir 22 is recessed in the inner groove. As shown in Figures 1 to 4, the oil reservoir 22 is an oil reservoir recessed in the periphery of the slide rail 2. The grease spring 23 is peripherally disposed so as to be positioned within the oil reservoir 22 of the slide rail 2, and the outer diameter of the grease spring 23 is equal to or less than the predetermined depth and height at which the oil reservoir 22 of the slide rail 2 is recessed.

[0019] 10 and 11, at least one auxiliary grease groove 24 is provided concentrically in the inclined surface portion of the inner groove 21 of the other slide rail 2, and at least one recessed groove body of the auxiliary grease groove 24 is connected to the oil reservoir 22 of the inner groove of the slide rail 2. A slide base 1 that slides in the inner groove 21 of the slide rail 2 is provided, and the oil reservoir 22, grease spring 23, and auxiliary grease groove 24 of the slide rail 2 move simultaneously due to the interlocking force generated when the slide base 1 moves, outputting lubricating oil and applying an oil film between the inner groove 11 of the slide base 1 and the inner groove 21 of the slide rail 2, thereby providing excellent lubrication function for a long period of time.

[0020] To sum up, the present invention has the following advantages: 1. To reliably provide a simple oil film lubrication structure for linear motion bearings, which has a simple structure, low cost, stable and smooth lubrication in motion, and high load capacity. 2. It has excellent lubrication, stable and smooth movement, and is dust-proof and dirt-proof, ensuring industrial practicality. 3. The invention has excellent industrial applicability, is economically effective, and is creative and progressive in nature, and certainly achieves its objectives. 4. It effectively improves the lubrication of conventional linear motion bearings, and effectively solves the drawbacks of conventional bearings, such as complex structure, many components, time-consuming assembly, poor lubrication, and limited lifespan.

[0021] The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents thereof. [Explanation of symbols]

[0022] 1 slide table 11 Inner groove 2 slide rails 21 Inner groove 22 Oil storage tank 23 Grease spring 24 Auxiliary grease groove 3 Rod Bearings 31 Arc angle

Claims

1. A linear motion bearing having an oil film lubrication structure, comprising a slide base, a slide rail, a rod bearing, an oil reservoir, and a grease spring, One or more inner grooves are provided on the opposing surfaces of the slide rail and the slide base, the shape of the inner groove of the slide rail is symmetrical to the shape of the inner groove of the slide base, and a space between the inner groove of the slide base and the inner groove of the slide rail is an installation space for the rod bearing, An oil reservoir is recessed in the inner groove of the slide rail at a predetermined depth and height, and a grease spring having elasticity for expansion and contraction is installed in the oil reservoir; A linear motion bearing, characterized in that the cross-sectional shape of the rod bearing is a polygonal polygon, and at least one angle of the polygonal polygon is a circular arc angle.

2. 2. The linear motion bearing according to claim 1, wherein the outer diameter of the grease spring, which has elasticity to expand and contract, is equal to or less than the depth and height of the oil reservoir recessed in the inner groove of the slide rail.

3. 2. The linear motion bearing according to claim 1, wherein the oil reservoir of the slide rail is recessed around the periphery of the slide rail.

4. 2. The linear motion bearing according to claim 1, wherein the grease spring of the slide rail is positioned in the oil reservoir of the slide rail.

5. 2. The linear motion bearing according to claim 1, wherein at least one auxiliary grease groove is provided concentrically in the inclined surface portion of the inner groove of the slide rail, and at least one groove body of the auxiliary grease groove is connected to the oil reservoir of the inner groove of the slide rail.

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