JP4660307B2 - Bearing fitting structure - Google Patents

Description

  The present invention relates to a bearing fitting structure suitable for a narrow space.

  Consists of an inner ring that fits outside the shaft, an outer ring that fits in the center of rotating parts such as gears and pulleys, and a plurality of rolling elements interposed between the inner and outer rings, such as a tapered roller bearing or an angular ball bearing. When assembling rolling bearings, preload (a load that is always applied in the axial direction) is applied to both the inner and outer wheels to increase the support rigidity and eliminate the gap between the inner and outer wheels and the rolling element, thereby reducing the vibration of rotating parts. Noise generation is prevented.

  When preload is applied to a rolling bearing, a method is employed in which a nut is screwed onto a shaft fitted with the rolling bearing and the nut is tightened toward an inner ring end surface of the bearing (see, for example, Patent Document 1).

  6 to 8 show an example of a conventional bearing fitting structure, which is sandwiched between a pair of rolling bearings 4 having a flange 1 at a base end portion and fitted into a hub 3 of a rotating component 2 and its inner ring. And a lock nut 7 screwed to the tip of the shaft 6 (the spacer 5 may not be used depending on the rolling bearing 4).

  The rotating component 2 is integrally formed with a stopper 8 sandwiched between the outer ring of one rolling bearing 4 fitted from one end side of the hub 3 and the outer ring of the other rolling bearing 4 fitted from the other end side of the hub 3. It is.

  The shaft 6 is provided with a hole 11 that penetrates from the distal end surface to the proximal end surface and through which a fixing bolt 10 for fastening the shaft 6 to the attachment object 9 is inserted. From the base end surface, the position guide boss 12 protrudes toward the attachment object 9.

  The inner ring of one rolling bearing 4 fitted to one end side of the hub 3 is in contact with the end face of the flange 1 of the shaft 6, and between the inner ring of the other rolling bearing 4 fitted to the other end side of the hub 3 and the lock nut 7. Is provided with a washer 13 for preventing rotation, which is a toothed washer.

That is, when the lock nut 7 is tightened to the shaft 6, one rolling bearing 4 in which the inner ring is sandwiched between the flange 1 and the spacer 5, and the other rolling bearing 4 in which the inner ring is sandwiched between the washer 13 and the spacer 5. A preload is applied to the.
JP 2003-301853 A

  However, when the bearing fitting structure shown in FIGS. 6 to 8 is used for power transmission means such as a gear train, if the installation place is narrow, the lock nut 7 screwed to the tip of the shaft 6 is There is concern about interference with other parts 14 in the vicinity.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a bearing fitting structure suitable for a narrow space.

In order to achieve the above object, the present invention includes a shaft on which a rolling bearing to which preload is to be applied is fitted, a shaft fixing bolt that penetrates from the distal end surface to the proximal end surface of the shaft and is screwed to an attachment object, A recess in which a head portion of the shaft fixing bolt is accommodated , and a plate that faces the tip end surface of the shaft and contacts the inner ring end surface of the rolling bearing; and a bearing fixing bolt that passes through the plate and is screwed to the shaft. The structure with is adopted.

In addition, the end face of the shaft and the plate are formed with concavities and convexities that are fitted together to restrict relative displacement in the circumferential direction.

  That is, the bearing fixing bolt is fastened to the shaft, the plate is pressed against the inner ring end face of the rolling bearing, and a preload is applied to the rolling bearing.

  According to the bearing fitting structure of the present invention, the following excellent effects can be obtained.

  (1) By tightening the bearing fixing bolt to the shaft, the plate is pressed against the inner ring end surface of the rolling bearing and preload is applied to the rolling bearing, so there is no need to screw parts such as lock nuts around the shaft. Thus, there is a space for other parts in the vicinity, and the adaptability to a narrow space is high.

  (2) Moreover, if the structure which forms the unevenness | corrugation which mutually fits and regulates the relative displacement to the circumferential direction is formed in the end surface of a shaft and a plate, slack of a bolt for bearing fixation can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show a first example of a bearing fitting structure according to the present invention. A pair of rolling bearings 4 having a flange 1 at a base end and fitted into a hub 3 of a rotating component 2 and an inner ring thereof. A shaft 15 fitted with a spacer 5 sandwiched between them, and the other rolling bearing facing the tip surface of the shaft 15 and fitted from the other end side of the hub 3 (the side without the flange 1 when viewed from the shaft 15). 4 is provided with a plate 16 in contact with the end face of the inner ring 4 and a fixing bolt 17 that passes through the plate 16 and is screwed onto the shaft 15 (the spacer 5 may not be used depending on the rolling bearing 4).

  The outer ring of one rolling bearing 4 fitted from one end side of the hub 3 and the outer ring of the other rolling bearing 4 fitted from the other end side of the hub 3 abut against a stopper 8 formed on the rotating component 2, and the hub The inner ring of one of the rolling bearings 4 fitted to one end side of 3 is in contact with the end face of the flange 1 of the shaft 15.

  The shaft 15 extends from the center of the front end surface toward the base end surface, and the screw hole 18 into which the fixing bolt 17 is screwed. The position of the screw hole 18 is removed and the shaft 15 penetrates from the front end surface to the base end surface. A hole 11 through which a fixing bolt 10 for fastening 15 to the attachment object 9 is inserted.

  A convex portion 19 that extends in the radial direction of the shaft 15 including the positions of the screw holes 18 and the holes 11 is formed on the distal end surface of the shaft 15, and the position guide boss 12 is attached to the base end surface of the shaft 15. It protrudes to the object 9 side.

  The plate 16 has a hole 20 that passes through the center thereof and through which the fixing bolt 17 is inserted.

  A portion of the plate 16 relative to the shaft 15 is formed with a concave portion 21 that fits into the convex portion 19 of the shaft 15 and a concave portion 22 in which the head of the fixing bolt 10 inserted through the hole 11 of the shaft 15 is received.

  Between the fixing bolt 17 and the plate 16, a non-rotating washer 23 which is a toothed washer is interposed.

  In this bearing fitting structure, when the fixing bolt 17 is inserted into the hole 20 of the plate 16, screwed into the screw hole 18 of the shaft 15, and tightened, one rolling in which the inner ring is sandwiched between the flange 1 and the spacer 5 is performed. Preload is applied to each of the bearing 4 and the other rolling bearing 4 in which the inner ring is sandwiched between the plate 16 and the spacer 5.

  Further, one of the teeth of the washer 23 is bent so as to fit into a groove 24 formed on the top of the fixing bolt 17.

  That is, when the fixing bolt 17 is fastened to the shaft 15, the plate 16 applies a preload to the rolling bearing 4, so there is no need to screw parts such as the lock nut 7 in FIGS. 6 to 8 around the shaft 15. Thus, there is a space for other parts 14 in the vicinity, and the adaptability to a narrow space is high.

  The convex portion 19 and the concave portion 21 are fitted to each other to restrict relative displacement in the circumferential direction of the shaft 15 and the plate 16, and the teeth of the washer 23 are fitted into the grooves 24, so that the washer 23 and the fixing bolt 17 are circumferentially arranged. Since the relative displacement is restricted, loosening of the fixing bolt 17 fastened to the shaft 15 can be prevented.

  FIG. 5 shows a second example of the bearing fitting structure of the present invention. Instead of the shaft 15 having the convex portion 19 and the plate 16 having the concave portion 21 in the first example, the shaft 25 and the plate 26 are replaced. In the figure, the same reference numerals as those in the first example denote the same parts.

  As with the shaft 15, a screw hole 18 into which the fixing bolt 17 is screwed is formed in the shaft 25, and a convex portion 27 is formed at a predetermined position in the circumferential direction of the tip surface of the shaft 25.

  Similar to the plate 16, the plate 26 has holes 20 through which the fixing bolts 17 are inserted.

  A concave portion 28 that fits into the convex portion 27 of the shaft 25 is formed at a position corresponding to the shaft 25 of the plate 26, and a washer 23 for preventing rotation is interposed between the fixing bolt 17 and the plate 26. .

  Moreover, the horizontal cross section of the shaft 25 and the plate 26 in FIG. 5 exhibits the same shape as FIG.

  In this bearing fitting structure, when the fixing bolt 17 is inserted into the hole 20 of the plate 26 and screwed into the screw hole 18 of the shaft 25 and then tightened, one rolling in which the inner ring is sandwiched between the flange 1 and the spacer 5 is achieved. Preload is applied to the bearing 4 and the other rolling bearing 4 in which the inner ring is sandwiched between the plate 26 and the spacer 5.

  That is, when the fixing bolt 17 is fastened to the shaft 25, the plate 26 applies a preload to the rolling bearing 4, so that there is no need to screw parts such as the lock nut 7 in FIGS. Thus, there is a space for other parts 14 in the vicinity, and the adaptability to a narrow space is high.

  The convex portion 27 and the concave portion 28 are fitted to each other to restrict the relative displacement in the circumferential direction of the shaft 25 and the plate 26, and the washer 23 and the fixing bolt 17 are surrounded by the teeth of the washer 23 as in the first example. Since relative displacement in the direction is restricted, loosening of the fixing bolt 17 fastened to the shaft 25 can be prevented.

  It should be noted that the bearing fitting structure of the present invention is not limited to the above-described embodiment, and it is needless to say that changes can be made without departing from the gist of the present invention.

  The bearing fitting structure of the present invention can be applied to support various rotating parts.

It is a longitudinal cross-sectional view which shows the 1st example of the bearing fitting structure of this invention. It is an II-II arrow line view of FIG. It is the III-III arrow line view of FIG. It is an exploded view of the component parts relevant to FIG. It is a longitudinal cross-sectional view which shows the 2nd example of the bearing fitting structure of this invention. It is a longitudinal cross-sectional view which shows an example of the conventional bearing fitting structure. It is a VII-VII arrow line view of FIG. It is a VIII-VIII arrow line view of FIG.

Explanation of symbols

4 Rolling bearing 10 Fixing bolt (shaft fixing bolt)
15 Shaft 16 Plate 17 Fixing bolt (bearing fixing bolt)
19 Convex part 21 Concave part
22 concave portion 25 shaft 26 plate 27 convex portion 28 concave portion

Claims (2)

A shaft on which a rolling bearing to which preload is to be applied is fitted, a shaft fixing bolt that penetrates from the distal end surface to the proximal end surface of the shaft and is screwed to an attachment object, and a head portion of the shaft fixing bolt are accommodated. A bearing comprising: a plate formed with a recess and facing the inner ring end surface of the rolling bearing so as to face the tip surface of the shaft; and a bearing fixing bolt that passes through the plate and is screwed to the shaft. Fitting structure. The bearing fitting structure according to claim 1, wherein the shaft end face and the plate are formed with concavities and convexities that are fitted together to restrict relative displacement in the circumferential direction .

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