JP4743066B2 - Temporary shaft of linear motion guide device and bearing of linear motion guide device - Google Patents

Description

  The present invention relates to a temporary shaft of a linear motion guide device and a bearing of the linear motion guide device, and is particularly suitable for application to a method of transporting or mounting a bearing on the temporary shaft.

  In the linear motion guide device, as shown in FIG. 8, a long rail 11 and a bearing 12 are provided, and a rolling element rolling groove is formed in the rail 11 and the bearing 12 in parallel to the longitudinal direction of the rail 11. The rolling element is configured to advance while rolling in the rolling element rolling groove. And when this rolling element goes to one end of the bearing 12 body, it is scooped up at the tip of the end cap 13, and a circulation hole opened in the bearing 12 body through a return guide provided in the end cap 13. Led to. Then, when the rolling element comes out to the other end of the bearing 12 body through the circulation hole, the rolling element facing the rail 11 and the bearing 12 body passes through a return guide provided in the end cap 13 on the opposite side. Returning to the rolling groove, the rolling element can perform infinite circulation (Patent Document 1).

When the linear motion guide device configured as described above is used by being attached to a machine tool, a robot, or the like, dust or dust accumulates on the rolling element rolling groove or other exposed surface of the rail 11 to prevent the rolling element from rolling. Therefore, the side seal 14 for dust prevention is usually attached to the end cap 13.
Further, before the bearing 12 is mounted on the rail 11, in order to prevent a rolling element provided on the bearing 12 from falling from the rolling element rolling groove, a temporary resin made by imitating the rail 11 is used. A bearing 12 is held on the shaft. The bearing 12 can be mounted on the rail 11 by arranging the temporary shaft in the longitudinal direction of the rail 11 and transferring the bearing 12 on the temporary shaft onto the rail 11.
JP 2005-83394 A

However, the temporary shaft of the conventional linear motion guide device has a uniform cross section, and the cross sectional area is smaller than the cross sectional area of the rail 11. For this reason, in the temporary shaft of the conventional linear motion guide device, in order to transport the bearing on the temporary shaft, it is necessary to separately provide a stopper in order to prevent the bearing on the temporary shaft from falling off.
Further, when the bearing 12 is inserted into the rail 11, the lip portion of the side seal 14 is slightly smaller than the cross section of the rail 11, and the side seal 14 may be damaged when passing the end of the rail 11. There is a problem in that it is necessary to chamfer the end portion of the rail 11 and the cost is increased.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a temporary shaft for a linear motion guide device that enables the bearing to be transported while preventing the bearing from falling off, and allows the bearing to be inserted into the rail without causing damage to the side seal. And providing bearings for linear motion guides.

In order to solve the above-described problem, according to the temporary shaft of the linear motion guide device according to claim 1, in the temporary shaft of the linear motion guide device that temporarily holds the bearing of the linear motion guide device, the cross-sectional shape of the temporary shaft Is substantially the same as the cross-sectional shape of the rail of the linear motion guide device, and the size of the cross-sectional external shape of at least one end of the temporary shaft is larger than the size of the cross-sectional external shape of the central portion and the rail. The size of the cross-sectional outer shape of the central portion of the shaft is formed smaller than the size of the cross-sectional outer shape of the rail, the temporary shaft can be divided into two in the axial direction, and the divided parts are The divided parts have the same shape, and the divided parts are provided with engaging parts for connecting the parts to each other, and the end of the temporary shaft is elastically deformable inward. .
Thereby, the cross-sectional shape of the temporary shaft is substantially the same as the cross-sectional shape of the rail of the linear guide device, and the size of the cross-sectional external shape of at least one end of the temporary shaft is larger than the size of the central cross-sectional external shape. Can be used as a stopper to prevent the bearings from falling off at both ends of the temporary shaft, without providing a separate stopper to prevent the bearing on the temporary shaft from falling off. It becomes possible to carry the bearing.
The cross-sectional shape of the temporary shaft is substantially the same as the cross-sectional shape of the rail of the linear motion guide device, and the size of the cross-sectional external shape of at least one end of the temporary shaft is larger than the cross-sectional external shape of the rail. The size of the cross-sectional outer shape of the central portion of the temporary shaft is smaller than the size of the cross-sectional outer shape of the rail, thereby functioning as a stopper for preventing the bearing from falling off at both ends of the temporary shaft. And the bearing can be inserted into the rail while pushing the lip portion of the side seal. For this reason, the bearing can be transported while preventing the bearing from falling off, and even if the lip portion of the side seal is slightly smaller than the cross section of the rail, the bearing can be moved without causing damage to the side seal. It can be inserted into the rail.
Further, the temporary shaft can be divided into two in the axial direction, and the divided parts have the same shape, so that the number of parts of the divided parts can be reduced, and the divided parts are produced. Therefore, it is possible to suppress the cost required for the mold, and to suppress the cost increase, and it is possible to prevent the management of the divided parts from becoming complicated.
In addition, since the divided parts are provided with an engaging portion that couples the parts to each other, it is possible to easily assemble and disassemble the divided parts, and reduce the time required for assembling and disassembling the divided parts. And the divided parts can be reused.
Further, the end portion of the temporary shaft has a hollow portion, is configured to project along the outer periphery of the end portion, and is formed with a separation portion that divides the upper surface and the side surface. By forming an overhanging part that can be elastically deformed with this part as a cantilever shape , even if the cross-sectional outer shape of the rail changes because the cover is mounted on the top surface of the rail, it can be handled with one temporary shaft. Therefore, it is possible to suppress an increase in cost and to prevent the management of the temporary axis from becoming complicated.

Further, according to the temporary shaft of the linear motion guide device according to claim 2 , the temporary shaft is formed by injection molding using a thermoplastic resin.
Thereby, even when the temporary shaft has a complicated shape, mass production can be performed at low cost .

Further, according to the temporary axis of the linear guide apparatus according to claim 3, rolling elements previously incorporated SL bearing characterized by providing a protrusion in the portion of the temporary shaft in contact.
Thereby, the protrusion part of a temporary shaft can be inserted between the rolling elements integrated in the bearing.
Moreover, according to the bearing of the linear motion guide device according to claim 4, the bearing is mounted on the temporary shaft according to any one of claims 1 to 3.
As a result, the bearing can be transported while preventing the bearing from falling off, and the bearing can be inserted into the rail without causing damage to the side seal.

  As described above, according to the present invention, it is possible to carry the bearing while preventing the bearing from falling off, and the side seal even when the lip portion of the side seal is slightly smaller than the cross section of the rail. The bearing can be inserted into the rail without any damage.

Hereinafter, a temporary shaft of a linear guide apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of a temporary shaft of a linear guide device according to an embodiment of the present invention, and FIG. 2A is a view of a divided part of the temporary shaft of FIG. 1 as viewed from one end face. 2 is a perspective view showing a schematic configuration, FIG. 2B is a perspective view showing a schematic configuration when the split part of the temporary shaft of FIG. 1 is viewed from one side of the other end face, and FIG. The perspective view which shows schematic structure when the split component of a temporary shaft is seen from the other side of the other end surface, FIG.2 (d) expands and shows the edge part of the split component of the temporary shaft of Fig.2 (a). FIG. 3A is a side view showing a schematic configuration of the split part of the temporary shaft in FIG. 2, FIG. 3B is a top view showing a schematic configuration of the split part of the temporary shaft in FIG. FIG. 3C is a front view showing a schematic configuration of the split part of the temporary shaft in FIG. 2, and FIG. 3D is a rear view showing a schematic configuration of the split part of the temporary shaft in FIG.

In FIG. 1, the temporary shaft 21 is composed of two divided parts 21a and 21b, and is configured such that the outer shape of the cross section thereof is not uniform in the longitudinal direction.
That is, the cross-sectional shape of the temporary shaft 21 is substantially the same as the cross-sectional shape of the rail 11 of the linear guide device of FIG. 8, and the size of the cross-sectional external shape of the end portions 22a and 22b of the temporary shaft 21 is the central cross-sectional external shape. It can be larger than the size of. Furthermore, the size of the cross-sectional outer shape of the end portions 22a and 22b of the temporary shaft 21 is larger than the size of the cross-sectional outer shape of the rail 11, and the size of the cross-sectional outer shape of the central portion of the temporary shaft 21 is the cross-sectional outer shape of the rail 11. It can be made smaller than the size of the shape.

  For example, the bottom surfaces of the end portions 22 a and 22 b of the temporary shaft 21 may be the same plane as the bottom surface of the rail 11, and the other surfaces may be larger than the cross-sectional outer shape of the rail 11. Further, the corner portions of the end portions 22a and 22b of the temporary shaft 21 are not chamfered, and the end portions 22a and 22b of the temporary shaft 21 and the central portion can be smoothly connected.

  As a result, the end portions 22a and 22b of the temporary shaft 21 can be provided with a function as a stopper for preventing the bearing 12 from falling off by the frictional force of the ball preload and the sealing frictional force. The bearing 12 can be inserted into the rail 11 while expanding the lip portion. Therefore, the bearing 12 can be transported while preventing the bearing 12 from falling off, and the side seal 14 is damaged even when the lip portion of the side seal 14 is slightly smaller than the cross section of the rail 11. Without this, the bearing 12 can be inserted into the rail 11.

Moreover, in the small part of the cross-sectional external shape of the temporary shaft 21, the frictional force at the time of inserting the bearing 12 can be reduced by blending the gap with the bearing 12.
In addition, it is preferable that the lengths of the end portions 22 a and 22 b of the temporary shaft 21 including the portion smoothly connected to the central portion of the temporary shaft 21 are smaller than the thickness of the end cap 13.
Thus, when the ball of the bearing 12 rides on the end portions 22a and 22b of the temporary shaft 21, the seal of the bearing 12 has already been transferred to the rail 11, and the temporary shaft is pushed by the ball of the bearing 12. Even when the end portions 22a and 22b of 21 are deformed, the seal of the bearing 12 can be prevented from being damaged.

  Further, as shown in FIG. 2, overhang portions 23 a and 23 b configured to overhang the outer circumferences of the end portions 22 a and 22 b of the temporary shaft 21 are formed at the end portions 22 a and 22 b of the temporary shaft 21. The end portions 22a and 22b of the temporary shaft 21 are hollow, and the projecting portions 23a and 23b are formed with a separation portion 24a that divides the upper surface and the side surface, and the upper surface portion has a cantilever shape and has elasticity. Can be made. In order to make it difficult for the bearing 12 to fall off the temporary shaft 21, it is preferable that the elastic deformation force of the projecting portions 23 a and 23 b is larger than the pressing force of the seal in contact with the upper surface of the rail 11. Moreover, the thickness of the overhang | projection parts 23a and 23b can be set in the range of about 0.05 mm-2 mm.

  Thereby, the end portions 22a and 23b of the temporary shaft 21 can be configured to be elastically deformable inward, and even when the cross-sectional outer shape of the rail 11 changes because the cover is mounted on the upper surface of the rail 11, Since it is possible to cope with one temporary shaft 21, it is possible to suppress an increase in cost, and it is possible to prevent management of the temporary shaft 21 from becoming complicated.

  Further, the divided parts 21a and 21b of the temporary shaft 21 can have the same shape. For example, the coupling surface of the divided part 21a is provided with an engaging portion 25a for coupling the divided parts 21a and 21b to each other. The engaging portion 25a is provided with a notch 26a for separating the divided parts 21a and 21b. Further, a convex portion 27a and a concave portion 28a for positioning when the divided components 21a and 21b are coupled to each other are formed on the coupling surface of the divided components 21a, and a cover for eliminating the step between the divided components 21a and 21b. A portion 29a is formed.

When the temporary shaft 21 is assembled, the engaging portion 25a of the divided component 21a is replaced with the divided component 21b while the convex portion 27a and the concave portion 28a of the divided component 21a are fitted to the concave portion and the convex portion of the divided component 21b. The divided parts 21a and 21b are coupled to each other.
On the other hand, when the temporary shaft 21 is disassembled, the divided parts 21a and 21b can be separated from each other by inserting a driver into the cutout portion 26a and releasing the engagement of the engagement portion 25a.

This makes it possible to easily assemble and disassemble the divided parts 21a and 21b, reduce the time required for assembling and disassembling the divided parts 21a and 21b, and re-install the divided parts 21a and 21b. Can be used.
The temporary shaft 21 can be formed by injection molding using a thermoplastic resin. Even when the temporary shaft 21 has a complicated shape, it can be mass-produced at a low cost.

FIG. 4A is a side view showing another schematic configuration of the provisional shaft divided component of the linear guide apparatus according to the embodiment of the present invention, and FIG. 4B is a division of the temporary shaft of FIG. 4A. FIG. 4C is a front view showing a schematic configuration of a divided part of the temporary shaft of FIG. 4A, and FIG. 4D is a divided of the temporary shaft of FIG. 4A. It is a rear view which shows schematic structure of components.
In FIG. 4, an engagement portion 127 a for coupling the divided component 121 a is provided on the coupling surface of the divided component 121 a of the temporary shaft. Further, a convex portion 125a for positioning when the divided component 121a is coupled is formed on the coupling surface of the divided component 21a, and an engaging portion of the other divided component and a concave portion 128a for inserting the convex portion are formed. Is formed.

When the temporary shaft is assembled, the engaging part 127a and the convex part 125 of the divided part 121a are fitted into the concave part of the other divided part, and the divided part 121a is coupled to the other divided part.
When the bearing 12 on the temporary shaft 21 is attached to the rail 11, the end 22 a of the temporary shaft 21 is brought into close contact with the end surface of the rail 11 as shown in FIG. 5. Then, the bearing 12 can be mounted on the rail 11 by transferring the bearing 12 on the temporary shaft 21 onto the rail 11.

FIG. 6A is a front view showing another schematic configuration of the temporary shaft of the linear guide device according to the embodiment of the present invention, and FIG. 6B shows a schematic configuration of the temporary shaft of FIG. FIG. 6C is a side view, and FIG. 6C is a rear view showing a schematic configuration of the temporary shaft of FIG.
In FIG. 6, the temporary shaft is composed of five divided parts 31 to 35, and is configured such that the outer shape of the cross section is not uniform in the longitudinal direction.

  That is, the cross-sectional shapes of the divided parts 31 to 35 are almost the same as the cross-sectional shape of the rail 11 of the linear motion guide device in FIG. 34, the divided parts 31 and 35 can have the same shape, and the divided parts 32 to 34 can have the same shape. Further, the size of the cross-sectional outer shape of the end portions of the divided parts 31 and 35 is larger than the size of the cross-sectional outer shape of the rail 11, and the size of the cross-sectional outer shape of the divided parts 32 to 34 is the cross-sectional outer shape of the rail 11. It can be made smaller than the size.

  For example, the bottom surfaces of the end portions of the divided parts 31 and 35 may be the same plane as the bottom surface of the rail 11, and the other surfaces may be larger than the cross-sectional outer shape of the rail 11. Further, the corners of the end parts of the divided parts 31 and 35 are not chamfered, and the end parts and the central part of the divided parts 31 and 35 can be smoothly connected. Further, the divided parts 32 to 34 can be produced in a bearing form, and the length can be made substantially the same as that of the short bearing.

  As a result, by combining the divided parts 31 to 35, the length of the temporary shaft can be matched to the type of bearing, and it becomes unnecessary to manufacture the temporary shaft for each type of bearing 12, thus increasing the cost. Can be suppressed. For example, a temporary shaft can be configured by using only one divided component 32 to 34 together with the divided components 31 and 35 at both ends, so that it can be used for a short bearing. Moreover, by using only two divided parts 32 to 34 together with the divided parts 31 and 35 at both ends, a temporary shaft can be configured, so that it can be used for a standard bearing. Moreover, by using only three divided parts 32 to 34 together with the divided parts 31 and 35 at both ends, a temporary shaft can be configured, so that it can be used for a long bearing. Furthermore, by further increasing the number of the divided parts 32 to 34, it can be used for a super long bearing.

In addition, it is preferable that the length of the edge part of the split parts 31 and 35 temporary shaft 21 including the part smoothly connected with the center part of the split parts 31 and 35 is smaller than the thickness of the end cap 13. FIG.
Thereby, when the ball | bowl of the bearing 12 rides on the edge part of the division | segmentation components 31 and 35, the seal of the bearing 12 can already be transferred to the rail 11, and it is pushed by the ball | bowl of the bearing 12 and is divided | segmented component 31. Even when the end of 35 is deformed, the seal of the bearing 12 can be prevented from being damaged.

  In addition, an extended portion configured to protrude along the outer periphery of the end of the divided parts 31, 35 is formed at the end of the divided parts 31, 35, and the ends of the divided parts 31, 35 are hollow. In addition, the projecting portion is formed with a separation portion that divides the upper surface and the side surface, and the upper surface portion can be made cantilevered to have elasticity. In order to make it difficult for the bearing 12 to fall off the temporary shaft, it is preferable that the elastic deformation force of the protruding portion is larger than the pressing force of the seal in contact with the upper surface of the rail 11. Further, the thickness of the overhang portion can be set within a range of about 0.05 mm to 2 mm.

Accordingly, the end portions of the divided parts 31 and 35 can be configured to be elastically deformable inward, and even when the cross-sectional outer shape of the rail 11 changes because the cover is mounted on the upper surface of the rail 11, Since it is possible to cope with one provisional axis, it is possible to suppress an increase in cost, and it is possible to prevent management of the provisional axis from becoming complicated.
In addition, for example, an engagement portion for coupling the divided components 31 to 35 to each other can be provided on the coupling surface of the divided components 31 to 35. And when assembling a temporary shaft, the divided parts 31-35 can be couple | bonded by engaging the engaging part of the divided parts 31-35.

  As shown in FIG. 7, a temporary shaft is constituted by four divided parts 41 to 44, and the sectional shape of the divided parts 41 to 44 is substantially the same as the sectional shape of the rail 11 of the linear motion guide device of FIG. The size of the cross-sectional outer shape of the end portion of the divided component 41 is larger than the size of the cross-sectional outer shape of the divided components 42 to 44, and the divided components 42 to 44 can have the same shape. Furthermore, the size of the cross-sectional outer shape of the end portion of the divided component 41 is larger than the size of the cross-sectional outer shape of the rail 11, and the size of the cross-sectional outer shape of the divided components 42 to 44 is larger than the size of the cross-sectional outer shape of the rail 11. Can also be reduced. Further, the divided parts 42 to 44 may be provided with protrusions 42 a to 44 a that enter between the balls of the ball row of the bearing 12.

It is a perspective view which shows schematic structure of the temporary axis | shaft of the linear guide apparatus which concerns on one Embodiment of this invention. FIG. 2A is a perspective view showing a schematic configuration when the split part of the temporary shaft of FIG. 1 is viewed from one end face, and FIG. 2B is one of the split parts of the temporary shaft of FIG. FIG. 2C is a perspective view showing a schematic configuration when the divided part of the temporary shaft of FIG. 1 is viewed from the other side of the other end surface, FIG. FIG. 3D is a perspective view showing an enlarged end portion of the divided part of the temporary shaft in FIG. 3A is a side view showing a schematic configuration of the split part of the temporary shaft in FIG. 2, FIG. 3B is a top view showing a schematic configuration of the split part of the temporary shaft in FIG. 2, and FIG. 2 is a front view showing a schematic configuration of the split part of the temporary shaft in FIG. 2, and FIG. 3D is a rear view showing a schematic configuration of the split part of the temporary shaft in FIG. FIG. 4A is a side view showing another schematic configuration of the provisional shaft divided component of the linear guide apparatus according to the embodiment of the present invention, and FIG. 4B is a division of the temporary shaft of FIG. 4A. FIG. 4C is a front view showing a schematic configuration of a divided part of the temporary shaft of FIG. 4A, and FIG. 4D is a divided of the temporary shaft of FIG. 4A. It is a rear view which shows schematic structure of components. It is a perspective view which shows a state when a temporary shaft is attached to a rail. FIG. 6A is a front view showing another schematic configuration of the temporary shaft of the linear guide device according to the embodiment of the present invention, and FIG. 6B shows a schematic configuration of the temporary shaft of FIG. FIG. 6C is a side view, and FIG. 6C is a rear view showing a schematic configuration of the temporary shaft of FIG. FIG. 7A is a front view showing still another schematic configuration of the temporary shaft of the linear guide apparatus according to the embodiment of the present invention, and FIG. 7B is a schematic configuration of the temporary shaft of FIG. FIG. 7C is a rear view showing a schematic configuration of the temporary shaft in FIG. It is a perspective view which shows schematic structure of a linear motion guide apparatus.

Explanation of symbols

11 Rail 12 Bearing 13 End cap 14 Side seal 21 Temporary shaft 21a, 21b, 121a Split parts 22a, 22b End 23a, 23b Overhang 24a Spacing 25a, 127a Engagement 26a Notch 27a, 125a Protrusion 28a, 128a Concave part 29a Cover part 31, 35, 41 End part parts 32, 33, 34, 42, 43, 44 Center part parts 42a, 43a, 44a Projection part

Claims (4)

In the temporary shaft of the linear motion guide device that temporarily holds the bearing of the linear motion guide device,
The cross-sectional shape of the temporary shaft is substantially the same as the cross-sectional shape of the rail of the linear motion guide device, and the size of the cross-sectional external shape of at least one end of the temporary shaft is the size of the cross-sectional external shape of the central portion and the rail. Is larger than the size of the cross-sectional outer shape of the central portion of the temporary shaft is smaller than the size of the cross-sectional outer shape of the rail,
The temporary shaft can be divided into two in the axial direction, and the divided parts have the same shape as each other, and the divided parts are provided with an engaging portion that couples the parts to each other. ,
The end portion of the temporary shaft is formed so that the end portion is hollow and is projected along the outer periphery of the end portion, and a separation portion that divides the upper surface and the side surface is formed. A temporary shaft of a linear motion guide device, characterized in that an overhanging portion that can be elastically deformed is formed in a cantilever shape .   The temporary shaft of the linear guide apparatus according to claim 1, wherein the temporary shaft is formed by injection molding using a thermoplastic resin. Temporary shaft of the linear guide apparatus according to claim 1, wherein the rolling elements previously incorporated SL bearing characterized by providing a protrusion in the portion of the temporary shaft in contact.   A bearing for a linear motion guide device, which is mounted on the temporary shaft according to any one of claims 1 to 3.

Images