JP2009002468A - Rolling element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling element simplifying a mounting structure by reducing a number of mounting parts, facilitating mounting work by reducing man-hour for mounting, and reducing an economical burden of stock control when plural kinds of stock is controlled by assuming changes of a mounting position. <P>SOLUTION: The rolling element 1 has an inner ring 1b and an outer ring 1a. An annular groove 7 in which a rail 6 is fitted is provided on the outer ring 1a. An annular seat 9 projecting in an axial direction of the rolling element 1 is provided continuously to one side surface of the inner ring 1b. A supporting shaft 3 is inserted in the inner ring 1b and the annular seat 9, and its screw portion is screwed with a screw hole of a leg portion 4. A supporting shaft head 3a and the leg portion 3a clips the other side surface of the inner ring 1b and a tip end surface of the annular seat 9, thereby mounting the rolling element 1 to the leg portion 4a. A mounting part is reduced to be only the supporting shaft, thereby simplifying a mounting structure and reducing man-hour for mounting. The rolling element 1 having the inner ring 1b provided with the seat 9 having different projecting amount by assuming the changes of the mounting position is prepared to reduce economical burden of stock control. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling element, and more particularly to a rolling element that rotates or rolls in contact with a rail.

  FIG. 3 is a longitudinal front view showing a conventional rolling element 1, and this conventional technique is described in Patent Document 1, for example. The rolling element 1 is formed of, for example, a deep groove ball bearing type radial bearing, and includes an outer ring 1a, an inner ring 1b, and a plurality of balls 1c arranged between the both 1a and 1b. The rolling element 1 is formed by inserting a bearing shaft 3 made of a bolt into a collar 2 fitted into an inner ring 1b and screwing a screw portion of the bearing shaft 3 into a screw hole of a leg portion 4a of a moving body 4, for example. The inner ring 1b is clamped and attached to the leg portion 4a by the washer 5 sandwiched between the bolt head 3a and the leg portion 4a of the moving body 4 and the flange portion 2a of the collar 2. Thereby, the plurality of balls 1c roll between the outer ring 1a and the inner ring 1b, and the outer ring 1a rotates around the inner ring 1b with the axis of the bearing shaft 3 as the rotation center.

  The outer ring 1a of the rolling element 1 is provided with an annular groove 7 into which the rail 6 is fitted on the outer periphery thereof. The rolling element 1 and the rail 6 constitute a linear guide as shown in FIG. In the linear motion guide of FIG. 4, the pair of left and right rails 6 have a predetermined span S and extend straight in the horizontal direction perpendicular to the paper surface to the attachment surface 8 a of the frame 8 and are swaged. Normally, each rail 6 is made of hardened steel having a high hardness, and the frame 8 is made of an extruded material made of an aluminum-based alloy having a low hardness. Therefore, each rail 6 having a circular cross section is formed on the mounting surface 8 a of the frame 8. After fitting into the left and right pair of substantially semicircular grooves, the side edges of each semicircular groove are pressed in the direction of the rail 6 using a caulking tool (not shown), and a raised portion (not shown) is formed by plastic deformation. The rails 6 are clamped to the mounting surface 8a of the frame 8 by forming and clamping the peripheral surfaces of the rails 6 with these raised portions.

  In FIG. 4, the moving body 4 has a gate shape and includes a pair of left and right legs 4 a extending vertically downward at both ends in the width direction. Each rolling element 1 is attached to each leg 4a by the bearing shaft 3 having a horizontal axis facing the inner surface 4b of the pair of left and right legs 4a. As a result, the pair of left and right rails 6 fits in the annular groove 7 provided in the outer ring 1 a of each rolling element 1. In practice, at least a pair of rolling elements (not shown) is separately attached to each leg portion 4a at a predetermined interval on the back side of each rolling element 1 shown in FIG. That is, at least two pairs, that is, a total of four rolling elements 1 are attached to each leg portion 4a of the moving body 4 having a portal shape at intervals in the paper surface direction. Of course, three or more pairs, a total of six or more rolling elements 1 may be attached.

  According to the said structure, when the driving force of the front-back direction (paper surface direction and anti-paper surface direction) is made to act on the moving body 4, each rolling element 1 rolls to a normal direction or a reverse direction along the rail 6, and a moving body 4 advances and retreats in the front-rear direction above the mounting surface 8 a of the frame 8. On the contrary, by fixing the moving body 4 and applying a driving force in the front-rear direction to the frame 8, each rolling element 1 is rotated at a fixed position, and the frame 8 is moved back and forth in the front-rear direction below the moving body 4. You can also.

Japanese Utility Model Publication No. 7-43498

  In order to attach the conventional rolling element 1 to the leg portion 4a, as shown in FIG. 3, the collar 2 having the flange portion 2a and the three parts of the bearing shaft 3 including the washer 5 and the bolt are necessary. 1: Insert the collar 2 through the inner ring 1b. 2: The bearing shaft 3 made of a bolt is inserted into the washer 5. 3: Insert the bearing shaft 3 into the collar 2 from the opposite side of the flange portion 2a. 4: Four man-hours are required to screw the screw portion of the bearing shaft 3 into the screw hole of the leg portion 4a. That is, in the rolling element 1 described in Patent Document 1, not only the number of parts for mounting is large and the mounting structure is complicated, but also the mounting work is complicated because the mounting man-hour is large.

  On the other hand, in the linear motion guide shown in FIG. 4, in order to realize a smooth relative movement of the moving body 4 and the frame 8 in the front-rear direction, interference between the moving body 4 and the frame 8 is avoided and the annular groove 7 of each rolling element 1 is used. It is required that each rolling element 1 be mounted at a mounting position at which the interval W between the groove width centers is equal to the span S of the rail 6.

  In the linear motion guide of the type shown in FIG. 4, assuming that the span of the rail 6 is S, the facing distance of the inner surface 4b of each leg 4a in the moving body 4 is W1, and the maximum width of the frame 8 is W2, the moving body 4 and the frame 8 In order to avoid this interference, the gap Δw may be formed at two locations between the inner surface 4b of each leg portion 4a and the widthwise end surfaces 8b of the frame 8 with W1> W2. In addition, in order to attach each rolling element 1 to an attachment position where the interval W of the groove width center C in the annular groove 7 is equal to the span S of the rail 6, the annular groove of each rolling element 1 from the inner surface 4b of each leg 4a. The axial dimension (thickness) t of the flange portion 2a may be set so that the mounting position setting dimension L to the groove width center C of 7 is (W1-W) / 2.

  That is, even if W1 and W2 change due to a change in the type of linear motion guidance, the gap Δw can be secured if W1> W2. Further, even if the span S of the rail 6 changes due to the change of the linear motion guide type, the mounting position setting dimension L is changed by using the collar 2 having the flange portion 2a having a different thickness t, so that the annular groove 7 can be set equal to the span S of the rail 6. Therefore, assuming the change in the mounting position of each rolling element 1 accompanying the change in the type of linear motion guide, inventory management of a plurality of types of collars 2 having different thicknesses t of the flange portions 2a can be performed. Even if the span S of 6 changes variously, the interval W of the groove width center C can be set equal to the span S corresponding to this change. However, since the collar 2 having the flange portion 2a is relatively difficult to manufacture, the cost is incurred. Therefore, there arises a problem that the economic burden of inventory management becomes large.

  The present invention solves such a problem, and its object is to simplify the mounting structure by reducing the number of mounting parts, and to facilitate the mounting work by reducing the number of mounting steps, The object is to provide rolling elements that can reduce the economic burden of inventory management.

In order to achieve the above object, a rolling element according to the present invention includes an inner ring and an outer ring, and a rolling element provided with an annular groove into which a rail fits on an outer peripheral part of the outer ring.
An annular seat protruding in the axial direction of the rolling element is provided continuously on at least one side surface of the inner ring.

  According to this, a rolling shaft is attached by inserting a supporting shaft (corresponding to the above-mentioned bearing shaft) through a series of inner rings and an annular seat, and fixing the distal end side of this supporting shaft to the attached member as appropriate. Can be attached to a member. That is, a collar with a flange or a washer which has been conventionally required is no longer necessary, and the number of mounting parts can be reduced to only the support shaft, so that the mounting structure is simplified.

  In addition, the number of man-hours for mounting the rolling elements is 1: Inserting the support shaft through a series of inner rings and an annular seat. 2: Since the number of man-hours for fixing the tip end side of the support shaft to the member to be attached can be reduced to two, the attachment work becomes easy.

  Furthermore, since the mounting position of the rolling element can be set by the amount of protrusion of the annular seat in the axial direction of the rolling element, inventory management of a plurality of types of rolling elements that are assumed to change the mounting position is performed by using the axis of the rolling element. It is only necessary to prepare rolling elements having a plurality of types of inner rings provided with annular seats with different projecting amounts in the direction, and it is easy to manufacture rolling elements having inner rings with different projecting amounts of annular seats. The influence of is small. Therefore, the economic burden of inventory management can be reduced.

  According to the present invention, since the number of parts for mounting can be reduced to only the support shaft, the mounting structure can be simplified. Further, since the number of man-hours for attaching the rolling elements can be reduced to two man-hours, the attachment work is facilitated. Furthermore, by preparing rolling elements with multiple types of inner rings provided with annular seats with different protrusions that are easy to manufacture and have little impact on cost, it is possible to cope with changes in the mounting position of the rolling elements. Even if inventory management is performed for a plurality of types of rolling elements assuming a change in position, the economic burden of inventory management can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal front view showing an embodiment of the present invention, and FIG. 2 is a front view showing an embodiment of a linear motion guide constituted by rolling elements according to the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the prior art example demonstrated in FIG. 3, FIG. 4, or an equivalent part.

  1 and 2, the rolling element 1 is formed of, for example, a deep groove ball bearing type radial bearing, and includes an outer ring 1a, an inner ring 1b, and a plurality of balls 1c arranged between the both 1a and 1b. The outer ring 1a is provided with an annular groove 7 into which the rail 6 is fitted on the outer periphery thereof.

  An annular seat 9 protruding in the axial direction of the rolling element 1 is provided integrally and continuously on one side surface (the right side surface in FIG. 1) of the inner ring 1b.

  According to the rolling element 1 having the above-described configuration, the bearing shaft (in the following description) made of a bolt is connected to the inner ring 1b and the annular seat 9 communicating with the inner ring 1b from the other side surface (the left side surface in FIG. 1). 3), and the screw portion of the support shaft 3 is screwed into, for example, the screw hole of the leg portion 4a of the moving body 4, so that the inner ring 1b is formed between the support head 3a and the leg portion 4a of the moving body 4. The rolling element 1 can be attached to the leg portion 4a by sandwiching the other side surface of the first member and the tip surface of the annular seat 9. Thereby, the plurality of balls 1c roll between the outer ring 1a and the inner ring 1b, and the outer ring 1a rotates around the inner ring 1b with the axis of the bearing shaft 3 as the rotation center. That is, according to the rolling element 1 according to the present invention, the collar 2 with the flange portion 2a and the washer 5 (see FIG. 3), which are conventionally required, are no longer necessary, and the number of mounting parts is limited to the support shaft 3 only. Since it can be reduced, the mounting structure is simplified.

  Further, the number of mounting steps of the rolling element 1 is as follows: 1: The support shaft 3 is inserted through a series of inner rings 1 b and an annular seat 9. 2: Since the number of man-hours for screwing the tip screw portion of the support shaft 3 into the screw hole of the leg portion 4a can be reduced, the mounting operation becomes easy.

  On the other hand, in FIG. 2, the mounting position of the rolling element 1 is set by the protruding amount l of each rolling element 1 in the axial direction of the annular seat 9 to avoid the interference between the moving body 4 and the frame 8 and each rolling element. Since the interval W at the center of the groove width in one annular groove 7 can be made equal to the span S of the rail 6, inventory management of a plurality of types of rolling elements 1 performed assuming a change in the mounting position is performed in the axial direction of the rolling elements 1. It is only necessary to prepare a rolling element 1 having a plurality of types of inner rings 1b provided with annular seats 9 having different protrusion amounts 1 to the ring, and manufacture of the rolling element 1 having inner rings 1b having different protrusion amounts 1 of the annular seats 9. Is easy and has little impact on costs, so the economic burden of inventory management can be reduced.

  In the above-described embodiment, the structure is described in which the annular seat 9 protruding in the axial direction of the rolling element 1 is provided on one side surface of the inner ring 1b, but the rolling element 1 is provided on each of both side surfaces of the inner ring 1b. The structure which provided the cyclic | annular seat 9 which protrudes in the axial direction of this may be sufficient. A stepped annular seat 9 having a stepped outer periphery may be provided.

It is a vertical front view which shows one Embodiment of this invention. It is a front view which shows the structural example of the linear motion guide using the rolling element which concerns on this invention. It is a vertical front view of a conventional example. It is a front view which shows the structural example of the linear guide using the conventional rolling element.

Explanation of symbols

1 Rolling element 1a Outer ring
1b Inner ring 6 Rail 7 Annular groove 9 Annular seat

Claims (1)

In a rolling element provided with an inner ring and an outer ring, and provided with an annular groove into which the rail fits on the outer periphery of the outer ring,
A rolling element characterized in that an annular seat protruding in the axial direction of the rolling element is provided continuously to at least one side surface of the inner ring.

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