JP2005214362A - Linear motion guide bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep lubricating environment favorable by preventing entering of foreign matter from the outer peripheral side of a lubricant supply member. <P>SOLUTION: This linear motion guide bearing device includes a lubricant supply member 15 fitted to the axial end part of a slider 2, formed of porous material containing a lubricant, and brought into sliding contact with a rolling element rolling groove 3 of a guide rail 1 to supply the lubricant. A plurality of lubricant supply members 15 are disposed in the axial direction of the slider 2, and a lip part 30 closely adhering to the lubricant supply member 15 adjacent in the axial direction of the slider 2 is provided along the outer peripheral part of the lubricant supply member 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a linear motion guide bearing device used in various machine devices such as machine tools, robots, and measuring instruments.

As a conventional linear guide bearing device of this type, for example, the one shown in FIG. 8 is known.
This linear motion guide bearing device includes a guide rail 1 extending in the axial direction, and a slider 2 straddling the guide rail 1 so as to be relatively movable in the axial direction.
Roller element rolling grooves 3 extending in the axial direction are formed on both side surfaces of the guide rail 1. The slider body 2 A of the slider 2 has rolling element rolling grooves on the inner side surfaces of both sleeve portions 4. 3 is formed with a rolling element rolling groove 7 opposite to the rolling element 7. A large number of balls B as an example of rolling elements are slidably loaded between the rolling grooves 3 and 7 facing each other, and the slider 2 is moved through the rolling of these balls B. It can move relative to the guide rail 1 along the axial direction.

Along with this movement, the ball B interposed between the guide rail 1 and the slider 2 rolls and moves to the end of the slider 2, but in order to continuously move the slider 2 in the axial direction, It is necessary to circulate these balls B indefinitely.
For this reason, a rolling element passage 8 penetrating in the axial direction is formed in the sleeve portion 4 of the slider body 2A, and substantially U-shaped end caps 5 are respectively attached to both ends of the slider body 2A. The end cap 5 is formed with a direction change path 6 curved in a semicircular arc shape that communicates between the rolling element rolling grooves 3 and 7 and the rolling element passage 8. A circular orbit is formed.

Further, on the outer surface of the end cap 5, a lubricant supply member 15 that supplies a lubricant in sliding contact with the rolling element rolling groove 3 of the guide rail 1 is connected to the end surface of the slider body 2 </ b> A together with the end cap 5 via a screw 12 or the like. It is fixed to.
The lubricant supply member 15 is made of a porous resin or the like containing a lubricant, and is formed in a substantially U shape like the end cap 5, and the screw 12 is inserted outside the both ends of the U shape. The fixing ring 16 is fitted, and a sliding contact portion 17 (see FIG. 1) for supplying a lubricant by slidingly contacting the rolling element rolling groove 3 of the guide rail 1 protrudes inside the U-shaped both ends. .
In FIG. 8, reference numeral 11 denotes a side seal fixed to the outer surface of the lubricant supply member 15 together with the lubricant supply member 15 and the end cap 5 on the end surface of the slider main body 2A via a screw 12 or the like, and 10 denotes a slider main body. A tapped hole of the screw 12 formed on the end face of 2A, 13 is a greasing nipple, and 14 is a bolt insertion hole for fixing the guide rail 1.

  In the conventional linear motion guide bearing device, when a plurality of lubricant supply members 15 are arranged in the axial direction of the slider 2 (see FIG. 9), the opposing surfaces of the respective lubricant supply members 15 adjacent to each other in the axial direction. Is pressed, the contact pressure of the sliding contact portion 17 on the rolling element rolling groove 3 of the guide rail 1 becomes weak, and the lubricant is not sufficiently supplied to the rolling element rolling groove 3. When the axial length of 16 is longer than the axial thickness of the lubricant supply member 15, a gap C <b> 1 (see FIG. 9) is provided between the lubricant supply members 15, and a plurality of lubricant supply members 15 are arranged. Further, the opposing surfaces of the lubricant supply members 15 are not pressed against each other.

However, when the gaps C1 are provided between the lubricant supply members 15 as described above, the plurality of lubricant supply members are moved toward one side in the axial direction by the reciprocating motion of the slider 2, and the gaps C1 are integrated to form the gaps C2. (Refer to FIG. 10) increases, and there is a problem that foreign matter enters from the gap C2 to deteriorate the lubricating environment.
The present invention has been made in order to eliminate such inconveniences, and provides a linear motion guide bearing device capable of preventing a foreign matter from entering from the outer peripheral side of a lubricant supply member and maintaining a good lubrication environment. The purpose is to provide.

To achieve the above object, the invention according to claim 1 includes a guide rail having a rolling element rolling groove extending in the axial direction, and a rolling element rolling groove facing the rolling element rolling groove of the guide rail. A slider straddling the guide rail so as to be relatively movable along the axial direction through rolling of a large number of rolling elements inserted between the rolling grooves of both the rolling elements, and a shaft of the slider And a lubricant supply member that is attached to an end portion in the direction and is formed of a porous material containing a lubricant and that is in sliding contact with the rolling element rolling groove of the guide rail and supplies the lubricant. A guide bearing device,
A plurality of the lubricant supply members are arranged in the axial direction of the slider, and a lip portion is provided to be in close contact with the lubricant supply member adjacent in the axial direction of the slider along the outer peripheral portion of the lubricant supply member. It is characterized by that.

  According to the present invention, since the lip portion that is in close contact with the lubricant supply member adjacent in the axial direction of the slider is provided along the outer peripheral portion of the lubricant supply member, the plurality of lubricant supply members are arranged in the axial direction of the slider. In the axial direction, it is possible to prevent the central portions of the opposing surfaces of the respective lubricant supply members adjacent to each other in the axial direction from being pressed, and a plurality of lubricant supply members are provided by the reciprocating motion of the slider. Even in the case of being moved to one side in the axial direction, it is possible to prevent the generation of a gap, thereby reducing the contact pressure to the rolling element rolling groove of the guide rail of the sliding contact portion of the lubricant supply member. In addition, it is possible to sufficiently supply the lubricant to the rolling element rolling grooves and to prevent foreign matter from entering from the outer peripheral side of the lubricant supply member, so that the lubricating environment can be maintained well. it can.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view for explaining a lubricant supply member used in a linear motion guide bearing device which is an example of an embodiment of the present invention. FIG. 2 is a diagram showing a plurality of lubricant supply members in FIG. FIG. 3 is a view showing the cross-sectional shape of the lip portion, and FIGS. 4 to 7 are views showing modifications of the cross-sectional shape of the lip portion. In this embodiment, portions overlapping those of the conventional linear motion guide bearing device already described with reference to FIGS. 8 to 10 are denoted by the same reference numerals and description thereof is omitted.

  A linear motion guide bearing device, which is an example of an embodiment of the present invention, is attached to the end of the slider 2 in the axial direction, is formed of a porous material such as a resin containing a lubricant, and the guide rail 1 is rotated. As shown in FIG. 1, a lubricant supply member 15 (slider 2 having an axial thickness of about 3 to 10 mm) that slides in contact with the moving body rolling groove 3 and supplies a lubricant is substantially the same as the end cap 5. A notch 18 into which a fixing ring 16 for inserting the screw 12 is fitted is formed on both outer sides of the U-shaped ends, and the rolling elements of the guide rail 1 are rolled on both inner sides of the U-shaped ends. A sliding contact portion 17 is provided in a projecting manner so as to slide in contact with the moving groove 3 and supply a lubricant.

  Further, a notch 19 into which a pressing member (not shown) such as a ring shape is fitted is formed at the approximate center of the upper end portion of the lubricant supply member 15 located above the guide rail 1. The upper end of the lubricant supply member 15 is pressed and deformed outward in the width direction of the slider 2 by fitting the pressing member into the slider 2, so that the U-shaped both ends located on the lower end side of the lubricant supply member 15 are moved to the slider 2. The sliding contact portion 17 is pressed against the rolling element rolling groove 3 of the guide rail 1 by being deformed inward in the width direction.

Here, in this embodiment, as shown in FIGS. 1 and 2, a plurality of lubricant supply members 15 are arranged in the axial direction of the slider 2, and the outer periphery of the lubricant supply member 15 is disposed on substantially the entire circumference. A lip portion 30 is provided so as to be in close contact with the lubricant supply member 15 adjacent in the axial direction of the slider 2.
The protruding length of the lip portion 30 in the axial direction of the slider 2 is such that the axial thickness of the slider 2 of the lubricant supply member 15 including the lip portion 30 is longer than the fixing ring 16 so that the lip portion 30 is the axis of the slider 2. Of course, the protrusion length is such that it can be brought into close contact with the lubricant supply member 15 adjacent in the direction, and even when a plurality of lubricant supply members 15 are moved toward one side in the axial direction by the reciprocating motion of the slider 2, The protruding length (for example, 0.1 mm or more) is set such that no gap is generated on the outer peripheral side of the lubricant supply member 15.

  Further, the lip portion 30 needs to have a certain degree of rigidity. However, if the rigidity is too strong, the pressing force between the lip portion 30 and the contact surface of the lubricant supply member 15 adjacent to the lip portion 30 becomes too large to lubricate. The agent supply member 15 is less likely to be deformed, the contact pressure of the guide rail 1 of the sliding contact portion 17 on the rolling element rolling groove 3 is weakened, and the lubricant is not sufficiently supplied to the rolling element rolling groove 3. Since there is a possibility, as shown in FIG. 3, the cross-sectional shape of the lip | rip part 30 is made into a triangular shape so that rigidity may not become strong too much more than necessary.

Further, in this embodiment, the triangular shape of the lip portion 30 has a base of 0.3 mm and a height (protrusion length) of 0.4 mm, and the resin or the like is used for molding the lubricant supply member 15 in the lip portion of the mold. It is easy to reach 30 molded parts. Incidentally, when the base was 0.2 mm, it was difficult for the resin to reach the molded portion of the lip portion 30 of the mold.
As described above, in this embodiment, the triangular lip portion 30 that is in close contact with the lubricant supply member 15 adjacent in the axial direction of the slider 2 is provided along the outer peripheral portion of the lubricant supply member 15. When the lubricant supply member 15 is arranged in the axial direction of the slider 2, it can be prevented that the lubricant is not sufficiently supplied to the rolling element rolling groove 3, and the reciprocating motion of the slider 2 allows a plurality of Even when the lubricant supply member 15 is moved to one side in the axial direction, it is possible to prevent a gap from occurring.

As a result, the lubricant can be sufficiently supplied to the rolling element rolling groove 3 without weakening the contact pressure of the sliding contact portion 17 of the lubricant supply member 15 to the rolling element rolling groove 3 of the guide rail 1. In addition, since it is possible to prevent foreign matter from entering from the outer peripheral side of the lubricant supply member 15, it is possible to maintain a good lubricating environment.
In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  For example, in the above-described embodiment, the case where the cross-sectional shape of the lip portion 30 is triangular is taken as an example, but the present invention is not limited to this. For example, the lip portion 30 having a square cross section shown in FIG. A lip portion 30 having an R-shaped tip, a lip portion 30 having an M-shaped cross section shown in FIG. When the lip portion 30 has a trapezoidal cross section, it is practically preferable that the dimensions of the upper side (tip) and the height (projection length) are 0.2 to 0.4 mm.

It is a figure for demonstrating the lubricant supply member used for the linear guide bearing apparatus which is an example of embodiment of this invention. FIG. 2 is a diagram illustrating a state in which a plurality of lubricant supply members in FIG. 1 are arranged in the axial direction of a slider. It is a figure which shows the cross-sectional shape of a lip | rip part. It is a figure which shows the modification of the cross-sectional shape of a lip | rip part. It is a figure which shows the modification of the cross-sectional shape of a lip | rip part. It is a figure which shows the modification of the cross-sectional shape of a lip | rip part. It is a figure which shows the modification of the cross-sectional shape of a lip | rip part. It is the perspective view which fractured | ruptured a part which shows an example of the conventional linear motion guide bearing apparatus. It is explanatory drawing for demonstrating the clearance gap between each lubricant supply member. FIG. 10 is an explanatory diagram for explaining a state in which the gaps in FIG. 9 are accumulated.

Explanation of symbols

1 Guide rail 2 Slider 3 Rolling element rolling groove (guide rail side)
7 Rolling element rolling groove (slider side)
B ball (rolling element)
15 Lubricant supply member 17 Sliding contact portion 30 Lip portion

Claims (1)

A guide rail having rolling element rolling grooves extending in the axial direction, and a rolling element rolling groove facing the rolling element rolling groove of the guide rail, and is inserted between these rolling element rolling grooves. A slider straddled on the guide rail so as to be relatively movable along the axial direction through rolling of a large number of rolling elements, and a porous material attached to an end of the slider in the axial direction and containing a lubricant And a lubricant supply member that supplies a lubricant in sliding contact with the rolling element rolling groove of the guide rail.
A plurality of the lubricant supply members are arranged in the axial direction of the slider, and a lip portion is provided to be in close contact with the lubricant supply member adjacent in the axial direction of the slider along the outer peripheral portion of the lubricant supply member. A linear motion guide bearing device characterized by that.

Images