JP2009002474A - Direct acting guide mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct acting guide mechanism capable of lengthen the checking period of a lubricant. <P>SOLUTION: A rolling body storing case 21 to store a rolling body 12 is provided so as to allow the rolling body 12 rolling on the raceway 6. The lubricant is filled into the internal space S of the rolling body storing case 21 except the space section occupied by the rolling body 12. A pair of scrapers 27 and 28 to collect the lubricant between the rolling body 12 and the raceway 6 by scraping the lubricant from above the raceway 6 are provided near a pair of an opening end located in both ends in a direction in which the raceway 6 of the opening 26 for rolling body exposure extends. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a linear motion guide mechanism used for a purpose of moving a beam such as a molded product take-out machine.

  FIG. 1 is an exploded perspective view showing a molded product take-out machine 1 and a resin molding machine 2 having a conventional linear motion guide mechanism disclosed in Japanese Patent Laid-Open No. 2001-38778 (Patent Document 1). . FIG. 2 is an enlarged view showing an example of a main part of a conventional linear motion guide mechanism provided in the molded product take-out machine. Further, FIG. 3 is an enlarged view showing the relationship between the track of the conventional linear motion guide mechanism and the rolling elements. 1 and 2, the molded product take-out machine 1 reciprocates the extraction beam 4 in the direction of the arrow X along the transverse beam 3 attached on the attachment portion 2A of the injection molding machine (resin molding machine) 2. . A main take-out mechanism of the molded product take-out machine 1 is mounted on the drawing beam 4. As shown in FIG. 2, the linear motion guide mechanism for reciprocating the extraction beam 4 in the direction of the arrow X includes a pair of plate-like orbit mounting portions 5 and 5 fixed to the upper surface of the transverse beam 3. Yes. The track mounting portions 5 and 5 extend along the transverse beam 3 and are actually bolted onto the transverse beam 3 as shown in FIG. On the upper and lower surfaces of the track mounting portions 5, 5, columnar tracks 6, 6 each having a circular cross-sectional shape are fixed so as to face each other in the thickness direction of the track mounting portion 5. As shown in FIG. 3, the track 6 is fixed in a state in which the cross-sectional shape formed in the track mounting portion 5 is fitted in an elongated groove 7 having a semicircular arc shape.

  As shown in FIG. 2, a base member 8 is fixed to the lower part of the extraction beam 4. The base member 8 includes a pair of vertical wall portions 9, 9 extending along both side surfaces of the transverse beam 3. A plurality of spiral holes 10 and 11 are formed in the vertical wall portions 9 and 9 at intervals in the vertical direction. These spiral holes 10 and 11 are provided as many as the number of rolling elements 12 to be used. In this example, eight rolling elements 12 roll on one track 6. The eight rolling elements 12 are arranged in a row in the X direction. A bolt member 13 whose tip portion constitutes a shaft member of the rolling element 12 is screwed into the spiral holes 10 and 11.

  As shown in FIG. 3, the rolling element 12 includes an inner ring 14 fitted to the tip of the bolt member 13, and an outer ring 16 that rotates outside the inner ring 14 via a rolling element 15 such as a sphere. A ball bearing type rolling element is used. An annular groove 17 into which the track 6 is fitted is formed on the outer peripheral surface of the outer ring 16. A lubricant such as grease is interposed between the plurality of rolling elements 12 and the track 6.

  In Japanese Utility Model Publication No. 7-43500 (Patent Document 2), an annular recess groove is formed in the center of the outer peripheral groove of the outer ring, and a ring-like sponge impregnated with a lubricant is fitted into the recess groove. A lubricant supply structure is disclosed.

Furthermore, Japanese Patent Laid-Open No. 2000-110732 (Patent Document 3) discloses that a lubricating oil supply member obtained by impregnating a porous resin with a lubricating oil is fixed to a base member to which a rolling element is attached. A structure for supplying lubricating oil is disclosed.
JP 2001-38778 A Japanese Utility Model Publication No. 7-43500 JP 2000-110732 A

  The lubricant exhibits a certain effect in order to prevent the rolling elements and the track from being worn. However, if the linear motion guide mechanism is continuously operated over a long period of time, a situation where the lubricant is insufficient occurs. Therefore, it is necessary to make the inspection period as short as possible so that the lubricant is not insufficient.

  An object of the present invention is to provide a linear motion guide mechanism capable of extending the inspection period of a lubricant.

  The linear motion guide mechanism to be improved by the present invention is a metal track attached to the track mounting portion and a base member that moves forward and backward along the track mounting portion and is rotatably supported on the track. Rolling elements that move. In this specification, the term “rolling” includes both the case where the rotating body rotates around the axis and the case where the sphere rotates. In the present invention, a rolling element accommodation case for accommodating the rolling elements is provided so as to allow the rolling elements to roll on the track. Then, a viscous lubricant is filled in the rolling element housing case. The lubricant has a viscosity that does not naturally flow out of the rolling element housing case in a short time. If the rolling element housing case is filled with a viscous lubricant, the rolling element will adhere appropriately to the rolling element in the rolling element housing case as the rolling element rotates. In addition, the lubricant can be supplied over a long period of time. Therefore, according to the present invention, it is possible to lengthen the inspection period of the lubricant as compared with the prior art.

  Since the lubricant is viscous, it does not flow out of the rolling element housing case in a short period of time. Therefore, the structure of the rolling element accommodation case is arbitrary. However, for example, when the rolling element housing case includes a rolling element exposure opening that exposes a part of the rolling element on a surface facing the track, the rolling element exposure case is positioned in a direction in which the track of the rolling element exposure opening extends. Preferably, a pair of scrapers that scrape the lubricant from the track and collect the lubricant between the rolling elements and the track are provided in the vicinity of the pair of open ends. When such a scraper is provided, the lubricant around the track can be moved together with the rolling elements by the scraper along with the movement of the base member, so that the lubricant is more than necessary outside the rolling element housing case. Leakage can be prevented.

  In addition, it is preferable that the scraper has a structure that does not deform so that the lubricant jumps in the moving direction of the base member when the rolling element rolls on the track. With the scraper having such a structure, even if the base member frequently moves forward and backward, the lubricant is not scattered around.

  In addition, the rolling element accommodation case can be provided with a lubricant supply plug used when filling the inside with a lubricant. If such a lubricant supply plug is provided, the lubricant can be replenished through the lubricant supply plug as necessary during periodic inspections, so that maintenance is facilitated. The attachment position and the number of the lubricant supply plugs are arbitrarily determined according to the number of rolling elements and the size of the rolling element accommodation case. For example, a pair of lubricant supply plugs used when filling the inside of the rolling element accommodation case with the lubricant can be provided on the pair of side wall portions positioned in the direction in which the raceway of the rolling element accommodation case extends. If a pair of lubricant supply plugs are provided at such positions, the lubricant can be replenished from both sides of the rolling element in the traveling direction, so that a necessary and sufficient amount of lubricant can be replenished inside the rolling element housing case. .

  Moreover, you may provide the partition wall part provided with the penetration path for lubricant distribution between two adjacent rolling elements in the inside of a rolling element storage case. By providing such a partition wall portion, it is possible to prevent the formation of a large lump of lubricant that is formed by the lubricant between the two rolling elements and is not substantially used. In addition, since the through hole for lubricant distribution is formed in the partition wall portion, the lubricant replenished from the lubricant supply plug sufficiently reaches the inside of the case through the through hole for lubricant distribution. As a result, even if the partition wall portion is provided, there is no problem in supplementing the lubricant.

  According to the present invention, the lubricant in the rolling element housing case is appropriately attached to the rolling element, and the lubricant can be supplied over a long period of time between the rolling element and the raceway. Thus, there is an advantage that the inspection period of the lubricant can be extended.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 4 is a partially cutaway cross-sectional view of the main part of an embodiment in which the present invention is applied to a linear motion guide mechanism of a molded product take-out machine. Members that are basically the same as those in the conventional structure shown in FIGS. 1 to 3 are given the same reference numerals as those shown in FIGS. As shown in FIGS. 4 to 6, in this embodiment, the rolling element 12 is allowed to roll on the track 6 with respect to one vertical wall portion 9 of the base member of FIG. A rolling element accommodation case 21 that accommodates the moving body 12 is fixed. The rolling element housing case 21 includes a case main body 23 having two wall portions 22 and 23 extending along the direction in which the rolling element 12 moves, that is, the X direction, and an L-shaped cross-sectional shape. It has a pair of side wall parts 24 and 25 located at both ends in the direction. The rolling element accommodation case 21 includes a rolling element exposure opening 26 facing the track mounting portion 5. In this example, the case main body 21 and the pair of side wall portions 24 and 25 are fixed to the vertical wall portion 9 using appropriate fixing means.

  A part of the rolling element 12 is exposed from the opening 26 for exposing the rolling element. The inner space S of the rolling element housing case 21 is a space that can be filled with a lubricant, except for the space occupied by the rolling elements 12. Although not shown, this space S is filled with highly viscous grease as a lubricant. The lubricant in the rolling element housing case 21 located on the upper side of the track attachment portion 5 is supplied between the rolling elements 12 and the track 6 in accordance with the gravity and the rotation of the rolling elements 12. Since the lubricant in the rolling element housing case 21 located below the track mounting portion 5 accumulates downward due to gravity, only the rotation of the rolling element 12 causes the rolling element 12 and the track 6 to move. Supplied in between. The lubricant has such a viscosity that it does not naturally flow out from the internal space S of the rolling element housing case 21 in a short time. Incidentally, if the consistency is 265 or more, the above requirement can be satisfied.

  In the vicinity of the pair of opening ends positioned at both ends in the direction (X direction) in which the track 6 of the rolling element exposure opening 26 extends, the lubricant is scraped from the track 6 so that the rolling element 12 and the track 6 A pair of scrapers 27 and 28 for collecting lubricant are provided between them. In the present embodiment, the two scrapers 27 and 28 are fitted in recesses 24 </ b> A and 25 </ b> A that are provided on the pair of side wall portions 24 and 25 and open toward the track mounting portion 5. The scrapers 27 and 28 are integrally molded products made of synthetic resin or hard rubber having predetermined wear resistance and predetermined elasticity. In use, the scrapers 27 and 28 are pressed against the surface of the track 6 with a predetermined pressure. However, the scrapers 27 and 28 have such a hardness and thickness (thickness in the X direction) that they do not deform when the rolling element 12 rolls on the track 6 so that the lubricant jumps in the moving direction of the base member. have. When such scrapers 27 and 28 are provided, even if the base member frequently moves back and forth, the lubricant is not scattered around. In addition, since the lubricant around the track 6 can be moved together with the rolling elements 12 by the scrapers 27 and 28 along with the movement of the base member, the lubricant leaks to the outside of the rolling element accommodation case 21 more than necessary. Can be prevented.

  In the present embodiment, a pair of lubricant supply plugs 29 and 30 used for filling the inside of the rolling element housing case 21 with the lubricant are provided on the pair of side wall portions 24 and 25, respectively. If the lubricant supply plugs 29 and 30 are provided, the lubricant can be replenished through the lubricant supply plug as necessary during periodic inspections, so that maintenance is facilitated. In particular, when a pair of lubricant supply plugs 29 and 30 are provided on the pair of side wall portions 24 and 25, respectively, as in the present embodiment, the lubricant can be replenished from both sides of the rolling element 12 in the traveling direction (X direction). Therefore, a necessary and sufficient amount of lubricant can be replenished in the rolling element housing case 21.

  Further, as shown in FIGS. 7 and 8, a partition wall portion 31 having a through-passage 32 for lubricant circulation is provided between the two adjacent rolling elements 12, 12 inside the rolling element housing case 21. May be. Providing such a partition wall 31 can prevent the formation of a large lump of lubricant that is formed by the lubricant between the two rolling elements 12 and 12 and is not substantially used. In the present embodiment, since the lubricant passage through passage 32 is formed in the partition wall portion 31, the lubricant replenished from the lubricant supply plugs 29 and 30 passes through the lubricant passage through passage 32. Fully pass through the case. As a result, even if the partition wall portion 31 is provided, there is no problem in supplementing the lubricant.

  The rolling elements of the above embodiment are radial ball bearing type rolling elements, but the present invention can of course be applied to other types of rolling elements. Moreover, in the said embodiment, although two rolling elements are arrange | positioned with respect to one track | orbit, the number of rolling elements is arbitrary. Of course, even when the number of rolling elements increases, the partition wall portion 31 shown in FIGS. 7 and 8 may be disposed between two adjacent rolling elements.

  Moreover, in the said embodiment, although the scrapers 27 and 28 are provided, if the viscosity of a lubricant is set appropriately, the scrapers 27 and 28 may not be provided.

  The configurations of the invention described in this specification will be listed below.

(1) a metal track attached to the track mounting portion of the molded product take-out machine;
A linear motion guide mechanism comprising a rolling element that is rotatably supported by a base member that moves forward and backward along the track mounting portion and rolls on the track,
A rolling element accommodation case for accommodating the rolling element so as to allow the rolling element to roll on the track;
A linear motion guide mechanism characterized in that the rolling element accommodation case is filled with a lubricant having a viscosity that does not flow out of the rolling element accommodation case.

(2) The rolling element housing case includes a rolling element exposure opening that exposes a part of the rolling element on a surface facing the track.
In the vicinity of a pair of opening ends positioned in the direction in which the track extends in the opening for exposing the rolling element, the lubricant is scraped off from the track and the lubricant is placed between the rolling element and the track. The linear motion guide mechanism according to (1) above, wherein a pair of scrapers to be collected are provided.

(3) In the above (2), the scraper has a structure that does not deform when the rolling element rolls on the track so that the lubricant jumps in the moving direction of the base member. The linear motion guide mechanism described.

(4) The linear motion guide mechanism according to (1), wherein the rolling element accommodation case is provided with a lubricant supply plug used when the lubricant is filled therein.

(5) The linear motion guide according to (1), wherein a partition wall portion including a through hole for lubricant distribution is provided between two adjacent rolling elements inside the rolling element housing case. mechanism.

(6) A pair of lubricant supply plugs used when the lubricant is filled in the rolling body housing case in the pair of side wall portions positioned in the direction in which the track of the rolling body housing case extends. The linear motion guide mechanism according to (1) above, wherein:

It is the perspective view which decomposed | disassembled and showed the molded product extraction machine provided with the conventional linear motion guide mechanism and the resin molding machine. It is an enlarged view which shows an example of the principal part of the linear motion guide mechanism provided in the molded article extraction machine of FIG. It is an enlarged view which shows the relationship between the track | orbit of a linear guide mechanism of FIG. 1, and a rolling element. It is a partially cutaway sectional view of an essential part of an embodiment in which the present invention is applied to a linear motion guide mechanism of a molded product take-out machine. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a partially cutaway sectional view of an essential part of another embodiment in which the present invention is applied to a linear motion guide mechanism of a molded product take-out machine. It is CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold take-out machine 2 Injection molding machine 3 Traverse beam 4 Drawing beam 5 Orbit mounting part 6 Orbit 7 Groove 8 Base member 9 Vertical wall part 10, 11 Spiral hole 12 Rolling body 13 Bolt member 14 Inner ring 15 Rolling element 16 Outer ring 21 Rolling body accommodation case 22, 23 Wall portion 24, 25 Side wall portion 26 Rolling body exposure opening portion 27, 28 Scraper 29, 30 Lubricant supply plug 31 Partition wall portion 32 Lubricant flow through passage

Claims (1)

A metal track attached to the track mount, and
A linear motion guide mechanism comprising a rolling element that is rotatably supported by a base member that moves forward and backward along the track mounting portion and rolls on the track,
A rolling element accommodation case for accommodating the rolling element so as to allow the rolling element to roll on the track;
A linear motion guide mechanism characterized in that the rolling element housing case is filled with a viscous lubricant.