Abstract:
It is a linear guide bearing apparatus comprising a slider  2  that has a slider body  2 A provided with a holes  7 , into which a circulating sleeve  8 , whose inside space serves as a rolling-element path  8   a,  is fitted, and also has an end cap  9,  which has a curved direction change path  10  communicating between a load raceway and a rolling-element path  8   a  and is fixed to an associated axial end portion of the slider body  2 A. The linear guide bearing apparatus further comprises a projecting portion  20,  which is provided at least at one of end portions of the circulating sleeve  8  and extends along the axial end portion of the slider body  2 A.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     The present invention relates to a linear guide bearing apparatus for use in, for example, industrial machines.  
         [0002]     For example, an apparatus shown in  FIG. 7  is known as a related linear guide bearing apparatus of such a kind (see, for instance, Patent Document 1).  
         [0003]     This linear guide bearing apparatus has a guide rail  1  extending in an axial direction, and a slider  2  bridged across the guide rail  1  to be able to be displaced with respect thereto in the axial direction. Two rows of rolling-element rolling grooves  3  extending in the axial direction are formed in each of both widthwise side surfaces of the guide rail  1 , so that a total of four rolling-element rolling grooves  3  are formed.  
         [0004]     Rolling-element rolling grooves  5  respectively opposed to the rolling-element rolling grooves  3  are formed in the inner side surfaces of both sleeve portions  4  of the slider body  2 A of the slider  2 . These rolling-element rolling grooves  3  and  5  constitute a load raceway.  
         [0005]     Many cylindrical rollers  6  serving as rolling elements are rollably loaded into the load raceway. Rolling of the rollers  6  enables the slider  2  to be displaced on the guide rail  1  in the axial direction with respect thereto.  
         [0006]     As the slider  2  is displaced, the cylindrical rollers  6  intervening between the guide rail  1  and the slider  2  roll and move to an axial end of the slider  2 . However, it is necessary for consecutively moving the slider  2  in the axial direction to endlessly circulate these cylindrical rollers  6 .  
         [0007]     Thus, cylindrical holes  7  axially penetrating through the sleeve portions  4  of the slider body  2 A are formed. Circulating sleeves  8 , the inside of each of which is used as a path (a rolling element path)  8   a  for the cylindrical roller  6 , are fitted into these holes  7 . Also, end caps  9  are respectively fixed to both axial ends of the slider body  2 A by screws. A direction change path  10 , which is curved like an arc and communicates between the load raceway and the rolling element path  8   a  is formed in each of the end caps  9 . Thus, an endless raceway for the cylindrical rollers  5  is formed.  
         [0008]     Incidentally, the direction change path  10  communicating between the upper rolling-element path  8   a  and each of both the lower rolling-element rolling grooves  3  and  5  is disposed to cross the direction change path  10 , which communicates between the lower rolling-element path  8   a  and each of both the upper rolling-element rolling grooves  3  and  5 , in a grade separation manner.  
         [0000]     [Patent Document 1] JP-A-2002-54633.  
         [0009]     In the related linear guide bearing apparatus, the rolling element path  8   a  of each of the circulating sleeves  8  fitted into the holes  7  of the slider body  2 A is a path for the cylindrical roller  8  and is cross-sectionally rectangular. Thus, it is necessary for forming the endless circulating raceway that when the circulating sleeves  8  are inserted into the holes  7 , an operation of carefully inserting or turning the circulating sleeves  8  is performed so that the phase of each of the circulating sleeves  8  is adjusted to an appropriate value with respect to the associated hole  7 . The related linear guide bearing apparatus has a drawback in that this operation is troublesome.  
       SUMMARY OF THE INVENTION  
       [0010]     The invention is accomplished to solve the drawback. An object of the invention is to provide a linear guide bearing apparatus enabled to easily achieve an operation of adjusting the phase of the circulating sleeves and also enabled to smoothly perform assembly thereof.  
         [0011]     To achieve the foregoing object, according to a first aspect of the invention, there is provided with a linear guide bearing apparatus including a guide rail, which has a rolling element rolling groove axially extends, and a slider, which has a rolling element rolling groove opposed to the rolling element rolling groove of the guide rail and is bridged across the guide rail to be able to be axially displaced with respect thereto by rolling a large number of rollers serving rolling elements, and which are inserted into a load raceway formed between the rolling element rolling grooves. The slider includes a slider body, in which a circulating sleeve is fitted into each of holes axially penetrating therethrough and has an inner part used as a rolling element path, and an end cap that has a curved direction change path communicating between the load raceway and the rolling element path and that is fixed at an axial end portion of the slider body. The first aspect linear guide bearing apparatus features that a projecting portion extending along an axial end surface of the slider body is provided at least at one of the circulating sleeves.  
         [0012]     According to the second aspect of the invention, there is provided with the linear guide bearing apparatus according to the first aspect, further including a concave portion, into which the projecting portion is fitted, provided in the end cap, wherein a phase of each of the circulating sleeves with respect to the slider body is adjusted by fitting the projecting portion into the concave portion.  
         [0013]     According to the third aspect of the invention, there is provided with the linear guide bearing apparatus according to the first or second aspect, wherein the projecting portion constitutes a part of the direction change path.  
         [0014]     According to a fourth aspect of the invention, there is provided with the linear guide bearing apparatus according to the first aspect, further including a concave portion provided in an axial end portion of the slider body, and a convex portion to be fitted into the concave portion provided on the projecting portion, wherein a phase of each of the circulating sleeves with respect to the slider body is adjusted by fitting the convex portion into the concave portion.  
         [0015]     According to a fifth aspect of the invention, there is provided with the linear guide bearing apparatus according to one of the first to fourth aspects, wherein the circulating sleeve with the projecting portion includes a first circulating sleeve constituent member and a second circulating sleeve constituent member, into which the circulating sleeve is split along a central axis thereof, and a color for discriminating between the first circulating sleeve constituent member and the second circulating sleeve constituent member is applied to at least one of the first circulating sleeve constituent member and the second circulating sleeve constituent member.  
         [0016]     According to a sixth aspect of the invention, there is provided with a linear guide bearing apparatus including a guide rail, which has a rolling element rolling groove axially extends, and a slider, which has a rolling element rolling groove opposed to the rolling element rolling groove of the guide rail and is bridged across the guide rail to be able to be axially displaced with respect thereto by rolling a large number of rollers serving rolling elements, and which are inserted into a load raceway formed between the rolling element rolling grooves. The sixth aspect linear guide bearing apparatus features that a color for discriminating paired components, which have object shapes, among components of the linear guide bearing apparatus, is applied to at least one of the paired components.  
         [0017]     According to the first aspect linear guide bearing apparatus of the invention, application of torque, which is used for rotating the circulating sleeve, to the projecting portion is facilitated by operating the projecting portion, which is provided at least at one of the circulating sleeves and extends along the axial end surface of the slider body, after the circulating sleeve is inserted into the hole of the slide body. Consequently, an operation of adjusting the phase of the circulating sleeve with respect to the hole of the slider body is facilitated.  
         [0018]     Also, even in a case where the circulating sleeve is firmly fixed in the hole of the slider body by intermediate-fitting or interference-fitting so as to increase the stiffness of the circulating sleeve and as to suppress the vibrations and the noises, the torque causing the circulating sleeve to be fitted into the hole to rotate can be applied by utilizing the projecting portion. Consequently, the operation of adjusting the phase of the circulating sleeve can easily be performed.  
         [0019]     The second aspect linear guide bearing apparatus features that a concave portion, into which the projecting portion is fitted, is provided in the end cap, and that a phase of each of the circulating sleeves with respect to the slider body is adjusted by fitting the projecting portion into the concave portion, in addition to the features of the first aspect linear guide bearing apparatus of the invention. Thus, when the apparatus is fabricated, the phase of the circulating sleeve can easily be adjusted.  
         [0020]     The third aspect linear guide bearing apparatus of the invention features that the projecting portion constitutes a part of the direction change path, in addition to the features of the first or second aspect linear guide bearing apparatus of the invention. Thus, the number of the components can be reduced. Also, the step-like parts in the circulating path, in which the rolling elements are circulated, are reduced. Consequently, the rolling elements can smoothly be passed therethrough.  
         [0021]     The fourth aspect linear guide bearing apparatus of the invention features that a concave portion is provided in an axial end portion of the slider body, that a convex portion to be fitted into the concave portion is provided on the projecting portion, and that a phase of each of the circulating sleeves with respect to the slider body is adjusted by fitting the convex portion into the concave portion, in addition to the features of the first aspect linear guide gearing apparatus of the invention. Thus, when the apparatus is fabricated, the phase of the circulating sleeve can easily be adjusted.  
         [0022]     Also, because the concave portion serves as a mark indicating the hole, into which the circulating sleeve is inserted, the circulating sleeve can be prevented from being inserted into the erroneous hole.  
         [0023]     The fifth aspect linear guide bearing apparatus of the invention features that a color for discriminating between the first circulating sleeve constituent member and the second circulating sleeve constituent member is applied to at least one of the first circulating sleeve constituent member and the second circulating sleeve constituent member, in addition to the feature of one of the first to fourth aspect linear guide bearing apparatuses. Thus, the first circulating sleeve constituent member and the second circulating sleeve constituent member can be discriminated from each other at a glance and also can be combined with each other.  
         [0024]     The sixth aspect linear guide bearing apparatus of the invention features that a color for discriminating paired components, which have object shapes, among components of the linear guide bearing apparatus, is applied to at least one of the paired components. Thus, the paired components of the linear guide bearing apparatus can be discriminated from each other at a glance and also can be combined with each other. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0025]      FIG. 1  is an explanatory view illustrating a primary part of a linear guide bearing apparatus that is an embodiment of the invention.  
         [0026]      FIG. 2  is an explanatory view illustrating the configuration of a circulating sleeve shown in  FIG. 1 .  
         [0027]      FIG. 3  is a left side view illustrating the circulating sleeve shown in  FIG. 1 .  
         [0028]      FIG. 4  is a view partly illustrating an end cap.  
         [0029]      FIG. 5  is an explanatory view illustrating a primary part of a linear guide bearing apparatus that is another embodiment of the invention.  
         [0030]      FIG. 6  is a view partly illustrating an axial end surface of a slider body.  
         [0031]      FIG. 7  is a partly cutaway explanatory view illustrating a related linear guide bearing apparatus. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0032]     Hereinafter, an embodiment of the invention is described with reference to the accompanying drawings.  FIG. 1  is an explanatory view illustrating a primary part of a linear guide bearing apparatus that is an embodiment of the invention.  FIG. 2  is an explanatory view illustrating the configuration of a circulating sleeve shown in  FIG. 1 .  FIG. 3  is a left side view illustrating the circulating sleeve shown in  FIG. 1 .  FIG. 4  is a view partly illustrating an end cap.  FIG. 5  is an explanatory view illustrating a primary part of a linear guide bearing apparatus that is another embodiment of the invention.  FIG. 6  is a view partly illustrating an axial end surface of a slider body. Incidentally, in this embodiment, parts, which are the same as or correspond to those described by referring to  FIG. 7 , are designated by the same reference characters used in  FIG. 7 . Thus, the description of such parts is omitted herein.  
         [0033]     As shown in FIGS.  1  to  3 , a linear guide bearing apparatus, which is an embodiment of the invention, has a projecting portion  20  that is provided at an end portion of a circulating sleeve  8  and extends along an axial end surface of a slider body  2 A.  
         [0034]     The circulating sleeve  8  including the projecting portion  20  is split along a central axis thereof into and comprises two parts, that is, a first circulating sleeve constituent member  8 R and a second circulating sleeve constituent member  8 L. A positioning convex portion  11  and a positioning concave portion  12  are respectively formed at a position on the splitting surface of one of the first circulating sleeve constituent member  8 R and the second circulating sleeve constituent member  8 L, and at a position in that of the other sleeve constituent member so that the position of the convex portion  11  corresponds to the position of the concave portion  12  when the first circulating sleeve constituent member  8 R and the second circulating sleeve constituent member  8 L are fitted to each other. The circulating sleeve  8  is formed by superposing the splitting surfaces of first circulating sleeve constituent member  8 R and the second circulating sleeve constituent member  8 L so that the positioning convex portion  11 , which is formed at a position on the splitting surface of one of the first circulating sleeve constituent member  8 R and the second circulating sleeve constituent member  8 L, is fitted into the positioning concave portion  12  formed in that of the other sleeve constituent member. A rolling element path  8   a  is formed in the circulating sleeve  8 . During this state, the circulating sleeve  8  is inserted into a hole  7  of the slider body  2 A. A color is applied to the entirety of at least one of the first circulating sleeve constituent member  8 R and the second circulating sleeve constituent member  8 L. This color enables that the first circulating sleeve constituent member  8 R and the second circulating sleeve constituent member  8 L can be discriminated from each other at a glance and also can be combined with each other. In this case, when the circulating sleeve constituent members  8 R and  8 L are formed of resin materials, preferably, a method of applying a color thereto is to apply a color directly to each of the resin materials. In a case where the circulating sleeve constituent members  8 R and  8 L are formed of metallic materials, and where it is difficult to apply a color directly to each of the metallic materials, the color may be applied to the members  8 R and  8 L by performing secondary processing, such as painting.  
         [0035]     Also, application of torque, which is used for rotating the circulating sleeve  8 , to the projecting portion  20  is facilitated by operating the projecting portion  20  after the circulating sleeve  8  is inserted into the hole  7  of the slide body  2 A. Consequently, the adjustment of the phase of the circulating sleeve  8  with respect to the hole  7  of the slider body  2 A is facilitated.  
         [0036]     Even in a case where the circulating sleeve  8  is firmly fixed in the hole  7  of the slider body  2 A by intermediate-fitting or interference-fitting so as to increase the stiffness of the circulating sleeve  8  and as to suppress the vibrations and the noises, the torque causing the circulating sleeve  8  to be fitted into the hole  7  to rotate can be applied by utilizing the projecting portion  20 . Consequently, an operation of adjusting the phase of the circulating sleeve can easily be performed.  
         [0037]     Also, in this embodiment, an inner periphery side raceway  10   a  of a direction change path  10  is formed in the projecting portion  20  so as to reduce the number of components. In this case, as shown in  FIG. 4 , a positioning concave portion  30 , whose bottom part is formed as an outer periphery side raceway  10   b , is provided in the end cap  9 . The projecting portion  20  is fitted into this positioning concave portion  30  to thereby adjust the phase of the circulating sleeve  8  with respect to the hole  7  of the slider body  2 A. Thus, the phase of the circulating sleeve  8  can easily be adjusted at fabrication of the apparatus.  
         [0038]     Also, the projecting portion  20  is formed integrally with the inner periphery side raceway  10   a  of the direction change path  10 . Thus, step-like parts in the path, in which the cylindrical rollers  6  are circulated, can be reduced. Consequently, the cylindrical rollers  6  can smoothly be passed therethrough.  
         [0039]     In this embodiment, a projection  32  is provided at the other end portion of the circulating sleeve  8  so that the projection  32  is fitted into a hole  31  (see  FIG. 4 ) provided in the opposite end cap  9 . The circulating sleeve  8  is more firmly fixed by fitting the projection  32  into the hole  31 .  
         [0040]     Incidentally, the linear guide bearing apparatus of the invention is not limited to the aforementioned embodiment. The embodiment can appropriately be altered without departing from the spirit and scope of the invention.  
         [0041]     For example, although the foregoing description of the embodiment has described the case that the phase of the circulating sleeve  8  with respect to the hole  7  of the slider body  2 A is adjusted by fitting the projecting portion  20  at the side of the circulating sleeve  8  into the positioning concave portion  30  provided in the end cap  9 , instead, the following configuration may be employed. That is, as shown in  FIGS. 5 and 6 , a convex portion  40  is provided on a side of the projecting portion  20  of the circulating sleeve  8 , which faces an axial end surface of the slider body  2 A. Also, a concave portion  41 , into which the convex portion  40  is fitted, is provided in the axial end surface of the slider body  2 A. The phase of the circulating sleeve  8  with respect the hole  7  of the slider body  2 A is adjusted by fitting the convex portion  40  into the concave portion  41 .  
         [0042]     Referring to  FIG. 6 , in this case, the concave portion  41  serves as a mark indicating the hole  7  (the lower one, as viewed in  FIG. 6 ), into which the circulating sleeve  8  is inserted. Thus, the circulating sleeve  8  can be prevented from being inserted into the erroneous hole  7  (the upper one, as viewed in  FIG. 6 ). Incidentally, the circulating sleeve  8  is inserted from an opposite side into the upper hole shown in  FIG. 6 . Similarly, the convex portion  40  provided in the projecting portion  20  of the circulating sleeve  8  is fitted into the concave portion  41  of the slider body  2 A.  
         [0043]     Also, although the foregoing description of the embodiment has described the case, in which a color is applied to at least one of paired right circulating sleeve members  8 R and  8 L, by way of example, the invention is not limited to this case. A color is applied to at least one of paired components, which have symmetric shapes, among components of the linear guide bearing apparatus so as to discriminate the paired components from each other. Thus, the invention can obtain effects of smoothly performing the fabrication of the linear guide bearing apparatus. Additionally, it is unnecessary to apply the color to the entirety of each of the components. A color may be applied to positions or a range on a part of each of the components so that the components can easily and visually be checked.