JP2015113882A - Side seal, and rolling bearing guide device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side seal and a rolling bearing guide device, which can easily adjust the tightening allowance of the side seal, and prevents the occurrence of an adverse effect caused by excessive enlargement of the tightening allowance of the side seal.SOLUTION: A side seal has plate-shaped core members (13a, 13b), and an elastic member (10) bonded to the core members. The core members and the elastic member form a trunk (11) which extends along a guide rail surface, and a pair of legs (12a, 12b) which protrude so as to sandwich a guide rail, from the trunk. A lip (14) which extends along a surface of the guide rail and contacts with the guide rail at a part on the guide rail side, of the trunk and the legs is formed at the elastic member. A deformation part (17) which can extend and contract in a longitudinal direction of the trunk is formed at a center of the trunk of the elastic member.

Description

  The present invention relates to a side seal and a rolling bearing guide device for a rolling bearing guide device that includes a guide rail, a slider, and a rolling element, and is used in various robots, transfer devices, semiconductor manufacturing devices, and the like.

  Conventionally, as a rolling bearing guide device, a linear motion guide device having a linearly extending guide rail and a curved motion guide device having a curved guide rail are known.

  The linear motion guide device includes, for example, a linear guide rail and a slider straddling the guide rail so as to be relatively movable in the longitudinal direction of the guide rail. The slider includes a slider body and a slider slide. And end caps disposed at both ends of the slider body, which are sometimes forward or backward, and a large number of rolling elements circulate in a circulation path formed in the slider while rolling between the guide rail and the slider body. By rolling the moving path, smooth relative movement between the guide rail and the slider is realized.

  The curved motion guide device includes a curved guide rail such as a ring, a slider configured to be slidable on the curved guide rail, and a rolling element.

  In such a rolling bearing guide device, if foreign matter such as dust or chips enter between the guide rail and the slider, it adversely affects the rolling of the rolling element. Therefore, on the outside of the end cap, that is, on the side opposite to the slider main body side of the end cap, a substantially U-shaped plate consisting of a body portion and a pair of leg portions is disposed so as to straddle the guide rail. Some of the guide rail surfaces are equipped with side seals having seal lips that are in sliding contact with three surfaces extending in the axial direction.

  However, since the portion of the seal lip that comes into sliding contact with the rolling groove of the guide rail needs to extend from the pair of leg portions into the rolling groove, the side seal is replaced due to wear or damage of the side seal. At this time, it takes time to remove the old side seal, and also when attaching a new side seal, the side seal has to be inserted from the end of the guide rail, which is troublesome.

  In view of this, there is a side seal that is configured such that a pair of legs can be expanded by elastically deforming the center of the body when attaching or removing the side seal (for example, Patent Document 1).

  Further, the side seal is divided into a seal member made of an elastic material such as rubber and a plate-like member for fixing the seal member to the end cap, and the plate-like member is divided into two at the middle portion of the body portion. There is a side seal.

JP-A-9-42284 JP 2007-309364 A

  However, in the above-mentioned prior art, if the position of the side seal is not adjusted, there is a risk that the sealing margin of the seal lip will be large. There were cases where it was caught and abnormal noise was generated, and the seal lip was prematurely worn.

  Moreover, in the said prior art, there existed a subject that adjustment of the position of a side seal took time.

  In view of such problems, the present invention provides a side seal and a rolling bearing guide device that can easily adjust the tightening allowance of the side seal and prevent the occurrence of harmful effects due to the excessive tightening allowance of the side seal. The purpose is to provide.

In order to solve the above problems, in the present invention,
A rolling bearing guide device having a substantially square pillar-shaped guide rail, a slider main body slidably straddled on the guide rail, and a plurality of rolling elements rolling between the guide rail and the slider main body Used for
In the shape of a plate, attached to the end of the slider main body at the head or tail during the sliding in a direction substantially perpendicular to the longitudinal direction of the guide rail,
A plate-shaped core member;
An elastic member bonded to the core member,
The core member and the elastic member form a trunk portion that extends along the surface of the guide rail, and a pair of legs that project from the trunk portion so as to sandwich the guide rail.
In the side seal in which the elastic member forms a lip portion that extends along the surface of the guide rail and contacts the guide rail on the guide rail side portion of the trunk portion and the leg portion,
The elastic member provides a side seal in which a deformable portion that can be expanded and contracted in the longitudinal direction of the body portion is formed at the center of the body portion.

  Preferably, the core member is divided into two parts via the deformable portion.

  Preferably, the body portion has a rectangular shape.

  Preferably, the deforming portion has a rod shape extending in the longitudinal direction of the body portion.

Preferably, the core member is divided into two parts by forming a slit in a direction perpendicular to the extending direction of the body part at the center of the body part,
The core member and the elastic member are bonded except for the deformed portion.

Further, in order to solve the above problems, the present invention
Provided is a rolling bearing guide device comprising the side seal.

  ADVANTAGE OF THE INVENTION According to this invention, the side seal tightening allowance can be adjusted easily and the side seal and rolling bearing guide apparatus which prevent generation | occurrence | production of the bad effect by the side seal tightening allowance becoming too large can be provided.

It is a perspective view which shows the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. It is a figure which shows the side seal of the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. (A) is a front view, (b) is a rear view, and (c) is an AA cross-sectional view shown in (a). It is a front view which shows the adjustment method of the side seal of the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. (A) shows the direction which extends a side seal, (b) has shown the state which extended the side seal. It is a front view which shows the side seal of the rolling bearing guide apparatus which concerns on 2nd Embodiment of this application. It is a figure which shows the side seal of the rolling bearing guide apparatus which concerns on 3rd Embodiment of this application. (A) is a front view, (b) is BB sectional drawing shown to (a).

(First embodiment)
A rolling bearing guide device 1 according to a first embodiment of the present application will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a rolling bearing guide device 1 according to a first embodiment of the present application.

  As shown in FIG. 1, the rolling bearing guide device 1 includes a long and narrow rectangular guide rail 2 and a slider 3 straddling the guide rail 2 so as to be relatively movable in the longitudinal direction of the guide rail 2. ing. In FIG. 1, a part of the guide rail 2 is omitted. Since the rolling bearing guide device 1 can be mounted in any direction, in the present application, as shown in FIG. 1, the longitudinal direction of the guide rail 2 of the rolling bearing guide device 1 is set to the X-axis direction and the X-axis direction. The direction perpendicular to the surface of the guide rail 2 in contact with the mounted portion is defined as the Y-axis direction, and the direction perpendicular to both the X-axis direction and the Y-axis direction is described as the Z-axis direction. Moreover, in this application, the upper side of FIG. 1 is demonstrated as the upper side of the rolling bearing guide apparatus 1, and the lower side of FIG.

  The guide rail 2 is made of metal, and a plurality of mounting holes 4 penetrating in the Z-axis direction are formed at equal intervals in the X-axis direction. The length of the guide rail 2 can be appropriately selected according to the application. The guide rail 2 is formed with corner rolling grooves 4a and 4b and side rolling grooves 5a and 5b having a substantially arc-shaped cross section extending in the X-axis direction. Escape grooves are formed at the bottoms of the side rolling grooves 5a and 5b. The guide rail 2 can be fixed to an arbitrary attached portion (not shown) by a bolt 7 that passes through the attachment hole 6.

  The slider 3 is attached to the slider main body 3a via the metal slider main body 3a, end caps 8a and 8b attached to the surface of the slider main body 3a which becomes the head or tail during sliding, and the end caps 8a and 8b. It is comprised from the side seals 9a and 9b.

  FIG. 2 is a view showing the side seal 9a of the rolling bearing guide device according to the first embodiment of the present application. (A) is the front view which shows the front which is the surface on the opposite side to the end cap 8a, (b) is the back view which shows the back surface which is the surface at the side of the end cap 8a, (c) is A- shown to (a). It is A sectional drawing. Since the side seal 9b has the same configuration as the side seal 9a, the side seal 9a will be described below, and the description of the side seal 9b will be omitted.

  The side seal 9a has a plate-like shape, a body portion 11 that is substantially rectangular in the Y-axis direction, and extends from the body portion 11 to both sides of the guide rail 2 so as to sandwich the guide rail 2 therebetween. Leg portions 12a and 12b having a plate shape with the same thickness are formed.

  The side seal 9a includes substantially rectangular plate-like core members 13a and 13b extending from the respective distal end portions of the leg portions 12a and 12b to the opposite end portion of the trunk portion in the Z-axis direction, and the core member of the side seal 9a. The elastic member 10 comprises portions other than 13a and 13b and embedded with core members 13a and 13b except for the surface on the slider body 3a side. In FIG.2 (b), the core members 13a and 13b are shown with the hatching of the broken line. The core members 13a and 13b and the elastic member 10 of the side seal 9a are bonded with an adhesive.

  The elastic member 10 of the side seal 9a can be formed from rubber or a thermoplastic elastomer. As the rubber, nitrile rubber, polyacrylic rubber, silicon rubber, fluorine rubber, or the like can be used. As the thermoplastic elastomer, a polyester elastomer, a styrene elastomer, or a polyamide elastomer can be used. As will be described later, the side seal 9a is configured to be able to adjust the tightening margin by pulling, and therefore needs a certain degree of elongation. Further, considering the heat generated from the rolling elements and the rolling grooves, a heat resistant material is preferable. Nitrile rubber is preferable when rubber is used, and polyester elastomer is preferable when elastomer is used.

  The core members 13a and 13b can be formed of SPCC material, polyester, polyacetal, polyamide or the like. Since the elastic member 10 repeatedly expands and contracts, the elastic member 10 and the core members 13a and 13b are worn. Therefore, the core members 13a and 13b are preferably polyacetal having wear resistance.

  The end of the body 11 facing the guide rail 2 and the end of the legs 12a and 12b facing the guide rail 2 are formed along the surface shape of the guide rail 2, and the slider 3 slides. A lip portion 14 is sometimes formed continuously to prevent intrusion of foreign matters. The lip portion 14 is formed of an end portion 14a that is in sliding contact with the guide rail 2, and a groove portion 14b that is formed between the end portion 14a and another resin portion.

  The dimension of the end portion 14a in the X-axis direction is substantially the same as that of the side seal 9a other than the lip portion 14. The surface of the end portion 14a facing the guide rail 2 is inclined with respect to the surface of the guide rail 2 so as to protrude toward the guide rail 2 on the front side of the side seal 9a and away from the guide rail 2 on the back side. Yes. The inclined surface is shown in FIG. The groove 14b is recessed from the front side to the back side with a depth of about one-half of the dimension of the end portion 14a in the X-axis direction. By forming the lip portion 14 in this way, the lip portion 14 is easily deformed according to a slight change in the surface shape of the guide rail 2 when the slider 3 slides.

  Through holes 16a and 16b for screwing the side seal 9a to the slider body 3 are formed in the leg portions 12a and 12b, respectively. Each of the through holes 16a and 16b includes a small diameter portion formed in the core members 13a and 13b and a large diameter portion formed in the elastic member 10, and forms a counterbore.

  The portion between the core member 13a and the core member 13b in the body portion 11 of the side seal 9a, that is, the portion formed on the body portion 11 in the lip portion 14 is disposed on the opposite side to the guide rail 2. A portion of the body portion 11 forms a deformed portion 17 composed only of the elastic member 10.

  FIG. 3 is a front view showing a method of adjusting the side seal 9a of the rolling bearing guide device 1 according to the first embodiment of the present application. (A) has shown the direction which extends the side seal 9a, (b) has shown the state which extended the side seal 9a.

  When both sides of the side seal 9a are pulled in the direction of the arrow in FIG. 3A, that is, in the Y-axis direction, as shown in FIG. 3B, when the deformed portion 17 and part of the lip portion 14 extend in the Y-axis direction. At the same time, it contracts in the direction of the arrow in FIG. Thereby, since the part which contacts the upper surface part of the guide rail 2 among the lip parts 14 moves to the direction away from the guide rail 2 in a Z-axis direction, the interference allowance of the lip part 14 can be made small. Moreover, the size of the tightening allowance can be easily adjusted by changing the strength with which the side seal 9a is pulled in the X-axis direction.

(Second Embodiment)
A rolling bearing guide apparatus according to a second embodiment of the present application will be described with reference to FIG. Since the rolling bearing guide device according to the second embodiment is different from the rolling bearing guide device according to the first embodiment only in the configuration of the side seal, the portions other than the side seal are denoted by the same reference numerals as those in the first embodiment. The side seal will be described by omitting the overlapping description.

  FIG. 4 is a front view showing a front surface that is a surface opposite to the end cap 8a of the side seal 29a of the rolling bearing guide device 1 according to the second embodiment. In the second embodiment, the side seals 29a and 29b attached to the front and rear of the slider body 3a have the same configuration, and therefore the description of the side seal 29b is omitted, and the side seal 29a will be described.

  The side seal 29a has a plate-like shape, and has a trunk portion 211 that is long in the Y-axis direction and leg portions 212a and 212b that are substantially rectangular and extend from the trunk portion 211 to both sides of the guide rail 2 so as to sandwich the guide rail 2 therebetween. And form.

  The side seals 29a are substantially rectangular plate-shaped core members 213a and 213b extending from the respective distal end portions of the leg portions 212a and 212b to the opposite end portions of the trunk portions in the Z-axis direction, and the core members of the side seals 29a. The elastic member 210 comprises portions other than 213a and 213b and embedded with core members 213a and 213b except for the surface on the slider body 3a side. The core members 213a and 213b and the elastic member 210 of the side seal 29a are bonded with an adhesive.

  The elastic member 210 of the side seal 29a can be formed from rubber or a thermoplastic elastomer. As the rubber, nitrile rubber, polyacrylic rubber, silicon rubber, fluorine rubber, or the like can be used. As the thermoplastic elastomer, a polyester elastomer, a styrene elastomer, or a polyamide elastomer can be used. As will be described later, the side seal 29a is configured such that the tightening margin can be adjusted by pulling, so that a certain degree of elongation is required. Further, considering the heat generated from the rolling elements and the rolling grooves, a heat resistant material is preferable. Nitrile rubber is preferable when rubber is used, and polyester elastomer is preferable when elastomer is used.

  The core members 213a and 213b can be formed of SPCC material, polyester, polyacetal, polyamide, or the like. Since the elastic member 210 repeatedly expands and contracts, the elastic member 210 and the core members 213a and 213b are worn. Therefore, the core members 213a and 213b are preferably polyacetal having wear resistance.

  The end of the body 211 facing the guide rail 2 and the end of the legs 212a and 212b facing the guide rail 2 are formed along the surface shape of the guide rail 2, and the slider 3 slides. A lip 214 is formed continuously to prevent the entry of foreign matters. The lip portion 214 is formed of an end portion 214a that is in sliding contact with the guide rail 2, and a groove portion 214b that is formed between the end portion 214a and another resin portion.

  The dimension of the end 214a in the X-axis direction is substantially the same as that of the side seal 29a other than the lip 214. The surface of the end 214a facing the guide rail 2 is inclined with respect to the surface of the guide rail 2 so as to protrude toward the guide rail 2 on the front side of the side seal 29a and away from the guide rail 2 on the back side. Yes. The groove 214b is recessed from the front side to the back side with a length of about one half of the dimension of the end 214a in the X-axis direction. By forming the lip portion 214 in this way, the lip portion 214 is easily deformed according to a slight change in the surface shape of the guide rail 2 when the slider 3 slides.

  In the leg portions 212a and 212b, through holes 216a and 216b for screwing the side seal 29a to the slider body 3 are formed. Each of the through holes 216a and 216b includes a small-diameter portion formed in the core members 213a and 213b and a large-diameter portion formed in the elastic member 210, and forms a counterbore.

  A portion between the core member 213a and the core member 213b of the body portion 211 of the side seal 29a constitutes an elongated rectangular columnar deformed portion 217 formed integrally with the lip portion 214 on the guide rail side. That is, the core member 213a and the core member 213b are connected by the deformed portion 217 disposed on the guide rail 2 side and a part of the lip portion 214, and the portion on the opposite side of the guide rail from the deformable portion 217. Forms a space portion that is recessed in a long rectangular shape in the Y-axis direction.

  According to the rolling bearing guide device according to the second embodiment having the above-described configuration, when the side seal 29a is pulled in the Y-axis direction, as in the first embodiment, the deformation portion 217 and a part of the lip portion 214 are Simultaneously expands in the Y-axis direction and shrinks in the Z-axis direction. As a result, the portion of the lip portion 214 that contacts the upper surface portion of the guide rail 2 moves away from the guide rail 2 in the Z-axis direction, so the tightening margin between the lip portion 214 and the guide rail 2 can be reduced. it can. Moreover, the size of the tightening allowance can be easily adjusted by changing the strength of pulling the side seal 29a in the X-axis direction. Furthermore, the deformation part 217 of the second embodiment can adjust the tightening margin with a smaller force than the first embodiment.

(Third embodiment)
A rolling bearing guide apparatus according to a third embodiment of the present application will be described with reference to FIG. Since the rolling bearing guide apparatus according to the third embodiment is different from the rolling bearing guide apparatus according to the first embodiment only in the configuration of the side seal, portions other than the side seal are denoted by the same reference numerals as those in the first embodiment. The side seal will be described by omitting the overlapping description.

  FIG. 5 is a view showing a side seal of the rolling bearing guide device according to the third embodiment. (A) is a front view which shows the front which is a surface on the opposite side to the end cap 8a, (b) is BB sectional drawing shown to (a). In the third embodiment, since the side seals 39a and 39b attached to the front and rear of the slider body 3a have the same configuration, the description of the side seal 39b is omitted, and the side seal 39a will be described.

  The side seal 39a is plate-shaped, and has a body portion 311 that is substantially rectangular in the Y-axis direction, and a substantially rectangular shape that extends from the body portion 311 to both sides of the guide rail 2 so as to sandwich the guide rail 2 therebetween. Leg portions 312a and 312b are formed.

  The side seal 39a constitutes portions other than the core members 313a and 313b of the side seal 39a, and core members 313a and 313b formed so as to cover substantially the entire front surface opposite to the end cap 8a. And an elastic member 310 in which core members 313a and 313b are embedded except for the surface on the slider body 3a side. The core member 313a and the core member 313b are formed separately by forming a slit extending in the Z-axis direction at the center of the body portion 311. In FIG. 5A, the core members 313a and 313b are indicated by dashed hatching. The core members 313a and 313b and the elastic member 310 are located on the upper side of the lip portion 314 formed on the body portion, that is, on the opposite side of the guide rail 2 from the lip portion 314 formed on the body portion. Except for the portion of the body portion 311, it is bonded with an adhesive. A portion of the elastic member 310 that is not bonded to the core members 313a and 313b by the adhesive forms a deformable portion 317 that can be expanded and contracted.

  The elastic member 310 of the side seal 39a can be formed from rubber or a thermoplastic elastomer. As the rubber, nitrile rubber, polyacrylic rubber, silicon rubber, fluorine rubber, or the like can be used. As the thermoplastic elastomer, a polyester elastomer, a styrene elastomer, or a polyamide elastomer can be used. As will be described later, the side seal 9a is configured to be able to adjust the tightening margin by pulling, and therefore needs a certain degree of elongation. Further, considering the heat generated from the rolling elements and the rolling grooves, a heat resistant material is preferable. Nitrile rubber is preferable when rubber is used, and polyester elastomer is preferable when elastomer is used.

  The core members 313a and 313b can be formed of SPCC material, polyester, polyacetal, polyamide, or the like. Since the elastic member 310 repeatedly expands and contracts, the elastic member 310 and the core members 313a and 313b are worn. Therefore, the core members 313a and 313b are preferably polyacetal having wear resistance.

  The end of the body 311 facing the guide rail 2 and the end of the legs 312a and 312b facing the guide rail 2 are formed along the surface shape of the guide rail 2, and the slider 3 slides. A lip portion 314 is sometimes formed continuously to prevent intrusion of foreign matters. The lip portion 314 is formed of an end portion 314a that is in sliding contact with the guide rail 2, and a groove portion 314b that is formed between the end portion 314a and another resin portion.

  The dimension of the end portion 314a in the X-axis direction is substantially the same as that of the side seal 39a other than the lip portion 314. The surface of the end 314a facing the guide rail 2 is inclined with respect to the surface of the guide rail 2 so as to protrude toward the guide rail 2 on the front side of the side seal 39a and away from the guide rail 2 on the back side. Yes. The groove 314b is recessed from the front side to the back side with a depth of about one half of the dimension in the X-axis direction of the end 314a. By forming the lip portion 314 in this way, the lip portion 314 is easily deformed according to a slight change in the surface shape of the guide rail 2 when the slider 3 slides.

  Through holes 316a and 316b for screwing the side seal 39a to the slider body 3 are formed in the leg portions 312a and 312b, respectively.

  According to the rolling bearing guide device according to the third embodiment having the above-described configuration, when the side seal 39a is pulled in the Y-axis direction, as in the first embodiment, the deformation portion 317 and a part of the lip portion 314 Simultaneously extends in the Y-axis direction and shrinks in the Z-axis direction. As a result, the portion of the lip portion 314 that contacts the upper surface portion of the guide rail 2 moves slightly away from the guide rail 2 in the Z-axis direction, so the tightening margin between the lip portion 314 and the guide rail 2 is reduced. be able to. Further, the size of the tightening allowance can be easily adjusted by changing the strength with which the side seal 39a is pulled in the X-axis direction. In the first embodiment, when the elastic member 310 is made of a softer material, the guide rail 2 and the lip portion 14 may be rubbed against each other, so that the lip portion 14 may be deformed. According to the embodiment, since the deformed portion is covered with the core members 313a and 313b, such a deformation can be prevented even if a soft material is used for the elastic member 310.

  In the above, specific embodiments have been described for the purpose of describing the present invention, but the present invention is not limited to this, and various modifications and improvements can be made.

  For example, in each of the side seals according to the above-described embodiment, the core member is divided into two parts, and the deformed portion is formed therebetween, but the core member may be divided into three or more.

  Also, the shape of the lip portion may be various shapes depending on the purpose of using the side seal or the usage status of the rolling bearing guide device.

  As described above, according to the present invention, a side seal and a rolling bearing guide device that can easily adjust the tightening allowance of the side seal and prevent the occurrence of harmful effects due to excessive tightening allowance of the side seal are provided. Can be provided.

DESCRIPTION OF SYMBOLS 1 Rolling bearing guide apparatus 2 Guide rail 3 Slider 3a Slider main body 4a, 4b Corner part rolling groove 5a, 5b Side part rolling groove 6 Mounting hole 7 Bolt 8a, 8b End cap 9a, 9b, 29a, 39a Side seal 10, 210, 310 Elastic member 11, 211, 311 Body portion 12a, 12b, 212a, 212b, 312a, 312b Leg portion 13a, 13b, 213a, 213b, 313a, 313b Core member 14, 214, 314 Lip portion 14a, 214a, 314a Tip part 14b, 214b, 314b Groove part 16a, 16b, 216a, 216b, 316a, 316b Through-hole 17, 217, 317 Deformation part

Claims (6)

A rolling bearing guide device having a substantially square pillar-shaped guide rail, a slider main body slidably straddled on the guide rail, and a plurality of rolling elements rolling between the guide rail and the slider main body Used for
In the shape of a plate, attached to the end of the slider main body at the head or tail during the sliding in a direction substantially perpendicular to the longitudinal direction of the guide rail,
A plate-shaped core member;
An elastic member bonded to the core member,
The core member and the elastic member form a trunk portion that extends along the surface of the guide rail, and a pair of legs that project from the trunk portion so as to sandwich the guide rail.
In the side seal in which the elastic member forms a lip portion that extends along the surface of the guide rail and contacts the guide rail on the guide rail side portion of the trunk portion and the leg portion,
The side seal according to claim 1, wherein the elastic member is formed with a deformable portion that can be expanded and contracted in a longitudinal direction of the body portion at a center of the body portion.   The side seal according to claim 1, wherein the core member is divided into two parts via the deformable portion.   The side seal according to claim 1, wherein the body portion has a rectangular shape.   The side seal according to claim 1, wherein the deformable portion has a rod shape extending in a longitudinal direction of the body portion. The core member is divided into two parts by forming a slit in a direction perpendicular to the extending direction of the body part at the center of the body part,
The side seal according to claim 1, wherein the core member and the elastic member are bonded to each other except for the deformed portion.   A rolling bearing guide apparatus comprising the side seal according to any one of claims 1 to 5.

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