JP2015121286A - Assembling method of bearing unit, and bearing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembling method of a bearing unit, and the bering unit free from increase of the number of components, though movement to an axial outer side of rollers can be restricted regardless of a seal device.SOLUTION: A plurality of cylindrical rollers 3 are disposed on an outer peripheral raceway surface 21 of an inner shaft 2, and then an outer ring 1 is relatively moved in the axial direction to the inner shaft 2 so that each of the cylindrical rollers 3 is positioned between an outer peripheral cylindrical raceway surface 11 and an inner peripheral cylindrical raceway surface 21. Then a plurality of balls 4 are disposed between an outer peripheral raceway groove 22 and an inner peripheral raceway groove 23 from the external through a ball insertion groove 23 of the inner shaft 2.

Description

  The present invention relates to a method for assembling a bearing unit in which rollers and balls are positioned at an interval in the axial direction. The present invention also relates to a bearing unit in which rollers and balls are positioned at an interval in the axial direction, for example, a bearing unit that can be suitably used for a water pump or the like.

  Conventionally, there is a bearing unit described in JP-A-2002-276816 (Patent Document 1). The bearing unit includes an inner shaft, an outer ring, a plurality of cylindrical rollers, a plurality of balls, and a seal device, and each cylindrical roller is positioned at an interval in the axial direction of each ball. The plurality of cylindrical rollers are disposed between the cylindrical raceway surface of the inner shaft and the cylindrical raceway surface of the outer ring, while the plurality of balls are disposed between the raceway groove of the inner shaft and the raceway groove of the outer ring. Has been.

  In the conventional bearing unit, cylindrical rollers can be arranged only after the balls are arranged. This is because when the ball is placed between the inner shaft and the outer ring, the inner shaft is decentered with respect to the central axis of the outer ring, and the ball is inserted from the circumferential direction where the radial clearance is increased. It is essential to do. Therefore, if the cylindrical roller is arranged between the inner shaft and the outer ring when the ball is arranged, the inner shaft cannot be decentered with respect to the central axis of the outer ring by the force received from the cylindrical roller. This is because it cannot be incorporated.

  Therefore, since the conventional bearing unit must dispose the cylindrical roller after disposing the ball, it is opposite to the axial ball side of the cylindrical roller on the outer peripheral surface of the inner shaft and the inner peripheral surface of the outer ring. The side is a cylindrical surface, and there is no flange on the inner shaft and on the opposite side of the outer ring. Thus, even after the ball is arranged between the inner shaft and the outer ring, the cylindrical roller can be inserted into the raceway surface from the outside opposite to the ball side in the axial direction.

  The said sealing apparatus is arrange | positioned on the opposite side to the ball side of the axial direction of a cylindrical roller. The sealing device prevents foreign substances from entering the bearing unit and prevents the cylindrical rollers from detaching to the outside.

Japanese Patent Laid-Open No. 2002-276816 (FIG. 14)

  In the conventional bearing unit, the seal device regulates the movement of the roller row in the axial direction on the outer side. However, the metal core of the sealing device is generally mild steel and is not resistant to wear, and the sealing device may be damaged by contact with the cage that holds the roller train. Further, in such a case, it is impossible to reliably regulate the outward movement of the rollers in the axial direction.

  On the other hand, if another part such as a collar ring or a retaining ring is attached to the outer ring or the inner shaft in order to avoid this damage, the number of parts increases, which is not preferable.

  Accordingly, an object of the present invention is to provide a bearing unit and a method for assembling such a bearing unit, in which the number of parts does not increase although the axial movement of the roller in the axial direction can be restricted regardless of the sealing device. It is to provide.

In order to solve the above-described problem, a method for assembling the bearing unit of the present invention includes:
The outer circumferential raceway surface, the outer circumferential raceway groove, and the ball insertion groove are positioned at an interval in the axial direction of the outer circumferential surface, and the outer circumferential raceway groove is between the outer circumferential raceway surface and the ball insertion groove. An inner shaft preparation step of preparing an inner shaft to be positioned;
A roller arrangement step of arranging a plurality of rollers on the outer circumferential raceway surface of the inner shaft;
After the roller arranging step, the outer ring having an inner circumferential raceway surface and an inner circumferential raceway groove is arranged such that the inner circumferential raceway surface faces the outer circumferential raceway surface in the radial direction of the inner shaft, and An outer ring arranging step of arranging a plurality of rollers between the outer circumferential raceway surface and the inner circumferential raceway surface;
After the outer ring arranging step, a ball arranging step of arranging a plurality of balls between the outer circumferential raceway groove and the inner circumferential raceway groove via the bead slot is provided.

  According to the present invention, after the rollers are arranged on the outer raceway surface of the inner shaft, the outer ring is assembled to the inner shaft and the rollers, and then the roller is interposed between the outer raceway surface of the inner shaft and the inner raceway surface of the outer ring. In the state of being arranged, the balls are arranged between the outer peripheral raceway grooves of the inner shaft and the inner peripheral raceway grooves of the outer ring through the bead insertion grooves of the inner shaft. Therefore, even if there is any flange that restricts the axial movement of the roller in at least one of the outer ring and the inner shaft, the roller will not be unable to be assembled between the inner shaft and the outer ring. Therefore, by forming a flange on at least one of the outer ring and the inner shaft, the movement of the roller in the axial direction can be restricted, and the number of parts of the bearing unit does not increase.

  Further, according to the present invention, by forming a flange portion on at least one of the outer ring and the inner shaft, even when a seal device exists on the opposite side of the roller in the axial direction, the roller or the roller The cage can be prevented from coming into contact with the sealing device, and the sealing device can be prevented from being damaged.

In one embodiment,
After the ball placement step, a cage having only one annular portion and a plurality of pillar portions projecting from the annular portion to only one side in the axial direction of the annular portion is formed on the pillar portion of the cage. It is inserted between the inner shaft and the outer ring from the front end side, and includes a cage assembly step for assembling the cage to the plurality of balls.

  According to the embodiment, since the plurality of balls can be held by the cage, the behavior of the balls can be stabilized.

In one embodiment,
The inner shaft has a shoulder on the opposite side to the outer peripheral raceway surface in the axial direction of the ball slot,
In addition, a sealing device having a slinger having a cylindrical portion is prepared,
After the ball arranging step, the sealing device is fixed to the outer peripheral surface of the shoulder portion in a state where the cylindrical portion of the slinger straddles the ball insertion groove and the outer peripheral surface of the shoulder portion. A sealing device arranging step is arranged between the outer ring and the inner shaft.

  According to the above embodiment, the cylindrical portion of the slinger straddles the ball slot and the outer peripheral surface of the shoulder located on the opposite side of the axial outer track surface side of the ball slot. Since it fixes to the outer peripheral surface of a shoulder part, it can prevent that foreign materials, such as a coolant, permeate into a ball slot from the exterior side of a seal device, and can improve seal performance markedly.

  Temporarily, the inner shaft does not have a shoulder on the side opposite to the roller side in the axial direction of the ball slot, and the side opposite to the roller side in the axial direction of the ball slot has an opening in the axial direction. If this is the case, even if the sealing device is arranged on the outer peripheral surface of the inner shaft, it is impossible to prevent foreign matter from entering the inside of the bearing unit through the axial opening of the ball slot.

The bearing unit of the present invention is
An outer ring having an inner circumferential raceway surface and an inner circumferential raceway groove on the inner circumferential surface;
The outer circumferential raceway surface, the outer circumferential raceway groove, and the ball insertion groove are positioned at an interval in the axial direction of the outer circumferential surface, and the outer circumferential raceway groove is between the outer circumferential raceway surface and the ball insertion groove. An inner shaft located,
A plurality of rollers disposed between the inner circumferential raceway surface and the outer circumferential raceway surface;
A plurality of balls disposed between the inner circumferential raceway groove and the outer circumferential raceway groove;
At least one of the outer ring and the inner shaft has an anti-ball side flange that overlaps the roller in the axial direction on the side opposite to the ball side in the axial direction of the roller.

  According to the present invention, at least one of the outer ring and the inner shaft has an anti-ball side flange that overlaps the roller in the axial direction on the opposite side to the axial ball side of the roller. Movement on the opposite side of the ball side can be restricted by the anti-ball side collar.

  Further, even if the seal device exists on the opposite side of the roller in the axial direction of the roller, it is possible to prevent the roller or the roller cage from coming into contact with the seal device on the opposite ball side flange. Therefore, the sealing device based on contact with the roller or the roller cage does not break.

  Further, according to the present invention, since at least one of the inner shaft and the outer ring has the anti-ball side flange, in order to restrict the movement of the roller on the side opposite to the ball side, There is no need to separately arrange roller axial direction movement restricting members such as a collar and a retaining ring separate from the shaft. Therefore, the number of parts does not increase.

In one embodiment,
The inner shaft has the anti-ball part,
The inner shaft has a ball side flange that overlaps the roller in the axial direction on the axial ball side of the roller.

  According to the above embodiment, since the inner shaft has the ball side collar that overlaps the roller in the axial direction on the ball side in the axial direction of the roller, the roller moves to the ball side in the axial direction at the ball side collar. Can be regulated. Therefore, the behavior of the roller can be stabilized, and the roller can be prevented from coming into contact with the ball.

In one embodiment,
The inner shaft has a shoulder on the opposite side to the roller side in the axial direction of the ball slot,
The ball insertion groove has an inclined portion in which the radial distance from the central axis of the inner shaft decreases as it goes to the roller side in the axial direction,
The inclined portion is connected to the outer peripheral surface of the shoulder portion.

  The bearing unit may have to reliably prevent foreign matter such as coolant from entering the bearing unit from the outside on the ball side in the axial direction, as in the case where it is mounted on a water pump, for example.

  According to the above embodiment, the inner shaft has a shoulder on the side opposite to the roller side in the axial direction of the ball slot, and the side opposite to the roller side in the axial direction of the ball slot opens in the axial direction. Not. Therefore, by sealing between the inner peripheral surface of the outer ring and the shoulder portion of the inner shaft with the sealing device, foreign matter such as coolant does not enter the ball insertion groove from the outside on the ball side in the axial direction. Accordingly, it is possible to improve the effect of suppressing the entry of foreign matter into the bearing unit.

  Temporarily, the inner shaft does not have a shoulder on the side opposite to the roller side in the axial direction of the ball slot, and the side opposite to the roller side in the axial direction of the ball slot has an opening in the axial direction. If this is the case, even if the sealing device is arranged on the outer peripheral surface of the inner shaft, it is impossible to prevent foreign matter from entering the inside of the bearing unit through the axial opening of the ball slot.

  The present invention, on the other hand, has a unique and characteristic part, that is, an inclined portion in which the radial distance from the central axis of the inner shaft decreases toward the roller side in the axial direction. Thus, a shoulder exists on the opposite side to the roller side in the axial direction of the ball slot. Therefore, in spite of the presence of the ball slot, foreign matter such as coolant cannot enter the ball slot from the opposite side of the seal device in the axial direction.

  According to the present invention, it is possible to realize a bearing unit and an assembling method of such a bearing unit that can suppress the outward movement of the roller in the axial direction irrespective of the sealing device, and the number of parts does not increase. .

It is a schematic cross section which shows the bearing unit of one Embodiment of this invention. It is an expansion schematic cross section of the area | region shown by A in FIG. It is sectional drawing of the axial direction of the inner shaft which passes the bottom of the inner groove of an inner shaft, and is a figure for demonstrating the structure of the inner groove of an inner shaft. It is a figure for demonstrating the assembly method of the bearing unit of this embodiment. It is a figure for demonstrating the assembly method of the bearing unit of this embodiment. It is a figure for demonstrating the assembly method of the bearing unit of this embodiment. It is a figure for demonstrating the assembly method of the bearing unit of this embodiment.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing a bearing unit according to an embodiment of the present invention.

  This bearing unit is mounted on a water pump. The bearing unit includes an outer ring 1, an inner shaft 2, a plurality of cylindrical rollers 3, a plurality of balls 4, a roller cage 5, a ball cage 6, and a seal device 7.

  The outer ring 1 has an integral structure. The outer ring 1 has an inner peripheral cylindrical raceway surface 11 and an inner peripheral raceway groove 12. The inner peripheral cylindrical raceway surface 11 is located at an axial distance from the inner peripheral raceway groove 12.

  On the other hand, the inner shaft 2 has an outer peripheral cylindrical raceway surface 21, an outer peripheral raceway groove 22, and a ball slot 23. The outer peripheral cylindrical raceway surface 21, the outer peripheral raceway groove 22, and the ball slotting groove 23 are located at a distance from each other in the axial direction of the outer peripheral surface of the inner shaft 2. Further, the outer circumferential raceway groove 22 is located between the outer circumferential cylindrical raceway surface 21 and the ball slotting groove 23 in the axial direction of the inner shaft 2.

  The roller cage 5 has two annular portions and a plurality of column portions. Each column part connects between one annular part and the other annular part. The plurality of column portions are located at intervals in the circumferential direction of one annular portion. A pocket for disposing the cylindrical roller 3 is formed between the column portions adjacent in the circumferential direction.

  On the other hand, the ball cage 6 is a so-called crown type cage. The ball retainer includes only one annular portion and a plurality of pillar portions protruding from only one side of the annular portion in the axial direction. The plurality of column portions protruding from the one side are located at intervals from each other in the circumferential direction of the single annular portion. A pocket in which the ball 4 is arranged is formed between the column portions adjacent in the circumferential direction.

  The plurality of cylindrical rollers 3 are positioned in the circumferential direction between the inner circumferential cylindrical raceway surface 11 and the outer circumferential cylindrical raceway surface 21 while being held by the roller cage 5. The plurality of balls 4 are positioned in the circumferential direction between the inner circumferential raceway groove 12 and the outer circumferential raceway groove 22 while being held by the ball cage 6.

  FIG. 2 is an enlarged schematic cross-sectional view of a region indicated by A in FIG. In FIG. 2, the illustration of the ball cage 5 is omitted.

  As shown in FIG. 2, the inner shaft 2 has an antiball side flange 25 on the opposite side to the axial ball 4 side (see FIG. 1) of the cylindrical roller 3, and the antiball side flange 25. Is overlapped with the cylindrical roller 3 in the axial direction. As shown in FIG. 2, the anti-ball side flange 25 has a depth similar to the radial thickness of the chamfer 31 of the cylindrical roller 3. The anti-ball side flange 25 restricts the movement of the cylindrical roller 3 on the side opposite to the ball 4 side in the axial direction.

  Referring again to FIG. 1, the inner shaft 2 has a ball side collar 26 on the ball 4 side in the axial direction of the cylindrical roller 3, and the ball side collar 26 overlaps the cylindrical roller 3 in the axial direction. ing. Although not shown, the ball side collar 26 also has a depth similar to the radial thickness of the chamfered portion 31 (see FIG. 2) of the cylindrical roller 3, similarly to the antiball side collar 25. The ball side flange 26 restricts the movement of the cylindrical roller 3 on the ball 4 side in the axial direction. There is a plane that can make the anti-ball side collar part 25 and the ball side collar part 26 substantially plane-symmetric (substantially, plane symmetry within a range in which processing errors are allowed).

  FIG. 3 is a sectional view in the axial direction of the inner shaft 2 passing through the bottom of the insertion groove 23 of the inner shaft 2, and is a view for explaining the structure of the insertion groove 23 of the inner shaft 2.

  As shown in FIG. 3, the inner shaft 2 has a shoulder portion 38 on the opposite side to the cylindrical roller 3 (see FIG. 1) side in the axial direction of the ball slot 23. The ball slot 23 has an inclined portion 35. In the sectional view in the axial direction of the inner shaft 2 passing through the bottom of the insertion groove 23 of the inner shaft 2, the inclined portion 35 moves toward the inner cylindrical roller 3 side in the axial direction indicated by the arrow A in FIG. 3. The distance in the radial direction from the central axis 2 is small.

  In other words, in the cross section, the inclined portion 35 is inclined so that the radial distance gradually increases toward the shoulder portion 38 in the axial direction. The end of the inclined portion 35 on the shoulder 38 side in the axial direction is connected to the end of the shoulder 38 on the side of the insertion groove 23 in the axial direction, and is opposite to the side of the cylindrical roller 3 in the axial direction of the ball insertion groove 23. Ends at the connection with the shoulder 38.

  As shown in FIG. 3, the insertion groove 23 has an axially extending portion 39, and the groove bottom of the axially extending portion 39 is substantially parallel to the axial direction. As shown in FIG. 3, the axial cylindrical roller 3 side of the axially extending portion 39 opens to the outer circumferential raceway groove 22, while the axially extending portion 39 is opposite to the axial cylindrical roller 3 side. The side is connected to the end of the inclined portion 35 on the cylindrical roller 3 side in the axial direction.

  Referring to FIG. 1 again, the end 50 of the outer ring 1 on the axial ball 4 side is closer to the axial ball 4 side than the end 51 on the opposite side to the cylindrical roller 3 side of the insertion groove 23. positioned. In this way, the ball 4 can be disposed in the raceway grooves 12 and 22 through the insertion groove 23 even if the end of the insertion groove 23 opposite to the cylindrical roller 3 side in the axial direction does not open in the axial direction. It is said.

  As shown in FIG. 1, the sealing device 7 is disposed between the end of the outer ring 1 on the ball 4 side in the axial direction and the end of the inner shaft 2 on the ball 4 side in the axial direction. The seal device 7 includes a metal slinger 53 and a seal member 54.

  As shown in FIG. 1, the slinger 53 has a cylindrical portion 57, and the cylindrical portion 57 is positioned so as to straddle the shoulder portion 38 and the ball slot 23. Only a part of the ball slot 23 overlaps the cylindrical portion 57 in the radial direction. The cylindrical portion 57 is externally fitted to the outer peripheral surface of the shoulder portion 38 and fixed. The seal member 54 seals between the slinger 53 and the end of the outer ring 1 on the ball 4 side in the axial direction. By arranging the cylindrical portion 57 of the slinger 53 of the sealing device 7 so as to straddle the shoulder portion 38 and the ball slot 23, foreign matter such as coolant enters the bearing unit through the ball slot 23. To prevent it.

  This bearing unit can be assembled as follows, for example.

  First, an inner shaft preparation process is performed. In this inner shaft preparation step, the inner shaft 2 having the above-described structure is prepared. Next, a roller arrangement process is performed. In this roller arrangement step, referring to FIG. 4, the plurality of cylindrical rollers 3 are bonded to the outer peripheral cylindrical raceway surface 21 of the inner shaft 2 by the adhesive force of grease. Next, for example, the component parts of the roller cage in which one annular portion and a plurality of column portions are integrated are moved in the axial direction, and the cylindrical roller 3 is interposed between the column portions adjacent in the circumferential direction. Place. Then, after sealing the front-end | tip part on the opposite side to the annular part side of each pillar part with another annular part, the another annular part is fixed to the front-end | tip part of each pillar part. In this manner, the roller cage 5 is assembled to the plurality of cylindrical rollers 3 to constitute the roller assembly 70.

  Next, an outer ring arrangement process is performed. In this outer ring arranging step, the outer ring 1 shown in FIG. 5 is moved relative to the roller assembly 70 (see FIG. 4) in the axial direction so that the outer ring 1 is opposite to the inner circumferential raceway groove 12 side in the axial direction. From the opening 60, the end of the roller assembly 70 on the insertion groove 23 side is inserted. Then, until each roller 3 of the roller assembly 70 is positioned between the inner peripheral cylindrical raceway surface 11 of the outer ring 1 and the outer peripheral cylindrical raceway surface 21 of the inner shaft 2, the roller assembly 70 is axially relative to the outer ring 1. Move. In this way, the outer ring 1 is assembled to the roller assembly 70.

  Next, a ball arrangement process is performed. In this ball arrangement step, referring to FIG. 6, each ball 4 is inclined in the axial direction indicated by an arrow B between the outer ring 1 and the inner shaft 2 from the outer side in the radial direction of the outer ring 1. Move to. In this way, each ball 4 is disposed between the outer peripheral raceway groove 12 and the inner peripheral raceway groove 22 via the ball insertion groove 23. Subsequently, a cage assembly process is performed. In this cage assembly process, a ball cage 6 (see FIG. 1), which is a crown type cage, is inserted from the opening on the ball 4 side in the axial direction of the space between the outer ring 1 and the inner shaft 2, The ball cage 6 is assembled to the plurality of balls 4.

  Finally, a sealing device arrangement process is performed. In this sealing device arrangement step, referring to FIG. 7, the sealing device 7 is arranged so that the cylindrical portion 57 of the slinger 53 straddles the shoulder portion 38 and the ball slot 23. In this way, the bearing unit shown in FIG. 1 is assembled.

  According to the method for assembling the bearing unit of the above embodiment, after the cylindrical roller 3 is disposed on the outer raceway surface 11 of the inner shaft 2, the outer ring 1 is assembled to the inner shaft 2 and the cylindrical roller 3, and then the cylindrical roller 3 is In a state where the ball 4 is disposed between the outer peripheral raceway surface 21 of the inner shaft 2 and the inner peripheral raceway surface 11 of the outer ring 1, the ball 4 is inserted into the outer peripheral raceway groove 22 and the inner peripheral raceway groove of the outer ring 1 through the bead groove 23. 12 is arranged. Therefore, the cylindrical roller 3 cannot be assembled between the inner shaft 2 and the outer ring 1 regardless of the flanges 25 and 26 that restrict the axial movement of the cylindrical roller 3 on the inner shaft 2. There is no. Therefore, by forming the flange portions 25 and 26 on the inner shaft 2, the movement of the cylindrical roller 3 in the axial direction can be restricted without increasing the number of parts, and the separation of the cylindrical roller 3 from the bearing unit can be prevented. .

  Further, according to the bearing unit of the above embodiment, the inner shaft 2 has the opposite ball side flange 25 that overlaps the cylindrical roller 3 in the axial direction on the opposite side to the axial ball 4 side of the cylindrical roller 3. The movement of the cylindrical roller 3 on the side opposite to the ball 4 side in the axial direction can be restricted by the anti-ball side flange 25.

  Even if a sealing device exists on the side opposite to the ball 4 side in the axial direction of the cylindrical roller 3 (although it does not exist in the present embodiment), the roller retainer 5 is attached to the antiball side flange 25. Contact with the sealing device can be prevented. Therefore, the sealing device is not damaged based on the contact with the roller cage 5.

  Further, according to the bearing unit of the above embodiment, since the inner shaft 2 has the anti-ball side flange 25, the outer ring is restricted to restrict the movement of the cylindrical roller 3 on the side opposite to the ball 4 side in the axial direction. It is not necessary to separately arrange roller axial direction movement restricting members such as a collar and a retaining ring separate from 1 and the inner shaft 2. Therefore, the number of parts does not increase.

  Further, according to the bearing unit of the above embodiment, the inner shaft 2 has the ball side flange 26 that overlaps the cylindrical roller 3 in the axial direction on the axial ball 4 side of the cylindrical roller 3. The portion 26 can restrict the cylindrical roller 3 from moving toward the ball 4 in the axial direction. Therefore, the behavior of the cylindrical roller 3 can be stabilized, and the cylindrical roller 3 can be prevented from contacting the ball 4.

  Moreover, since the bearing unit of this embodiment is mounted on the water pump, it is necessary to reliably prevent the coolant from entering the bearing unit from the outside on the ball 4 side in the axial direction.

  According to the bearing unit of the above embodiment, the inner shaft 2 has the shoulder 38 on the opposite side to the cylindrical roller 3 side in the axial direction of the ball insertion groove 23, and the cylindrical roller 3 in the axial direction of the ball insertion groove 23. The side opposite to the side is not open in the axial direction. Therefore, by sealing the space between the inner peripheral surface of the outer ring 1 and the shoulder portion 38 of the inner shaft 2 with the sealing device 7, the coolant can enter the ball insertion groove 23 from the outside on the ball 4 side in the axial direction. Absent. Accordingly, it is possible to improve the effect of suppressing the entry of foreign matter into the bearing unit.

  Temporarily, the inner shaft does not have a shoulder on the side opposite to the roller side in the axial direction of the ball slot, and the side opposite to the roller side in the axial direction of the ball slot has an opening in the axial direction. If this is the case, even if the sealing device is arranged on the outer peripheral surface of the inner shaft, it is impossible to prevent foreign matter from entering the inside of the bearing unit through the axial opening of the ball slot.

  On the other hand, according to the bearing unit of the above embodiment, the ball groove 23 is a unique and characteristic part, that is, the radial direction from the central axis of the inner shaft 2 toward the cylindrical roller 3 side in the axial direction. And a shoulder portion 38 is present on the side opposite to the cylindrical roller 3 side in the axial direction of the ball slot 23. Therefore, despite the presence of the ball insertion groove 23, the coolant cannot enter the ball insertion groove 23 from the side opposite to the ball 4 side in the axial direction of the sealing device 7.

  In the assembly method of the above embodiment, each cylindrical roller 3 is bonded to the outer peripheral cylindrical raceway surface 21 by the adhesive force of grease in the roller arranging step. However, in the present invention, at least one of the inner shaft and the rollers may be magnetized, and each roller may be attached to the outer raceway surface of the inner shaft, or an annular jig made of rubber band, plastic such as polyethylene, or the like Thus, a plurality of rollers may be constrained on the outer raceway surface. In this state, a cage may be assembled to the plurality of cylindrical rollers. In the present invention, first, a plurality of rollers are assembled to a cage to form a cage assembly having the cage and the plurality of rollers, and then the cage assembly is cooled and fitted to the outer peripheral raceway surface of the inner shaft. You may arrange in. Note that the roller cage does not necessarily have to exist, but in this case, the roller remains on the outer circumference of the inner shaft until the roller is incorporated into the outer ring by means of magnetic force, grease adhesion, or an annular jig. Do not leave the raceway. Needless to say, when the annular jig is used, the annular jig is removed during the outer ring arrangement or after the outer ring arrangement step.

  Further, in the bearing unit of the above embodiment, the inner shaft 2 has the anti-ball side flange 25. However, in the present invention, the outer ring may have an anti-ball side flange that prevents movement of the roller in the axial direction on the opposite side of the roller in the axial direction, or Both of the inner shaft and the inner shaft may have an opposite ball side flange that prevents movement of the roller in the axial direction on the opposite side of the roller in the axial direction.

  Further, in the bearing unit of the above embodiment, the inner shaft 2 has the ball side flange 26. However, in this invention, the inner shaft has a ball side flange on the ball side in the axial direction of the roller. You don't have to. In this case, a protrusion that protrudes in the radial direction is provided in a portion of the roller cage that is located on the ball side of the roller, and the protrusion is provided in a recess provided on at least one peripheral surface of the outer ring and the inner shaft. If it arrange | positions, the movement of the ball side of the axial direction of a roller can be controlled, and it is preferable.

  In the bearing unit of the above embodiment, the cylindrical portion 57 is fixed to the outer peripheral surface of the shoulder portion 38 with the cylindrical portion 57 of the slinger 53 of the sealing device 7 straddling the shoulder portion 38 and the ball slot 23. did. However, in the present invention, all of the cylindrical portion of the slinger of the sealing device may be fixed by being externally fitted to the shoulder portion, and the cylindrical portion of the slinger does not have a portion that overlaps the bead groove in the radial direction. May be. Moreover, in this invention, a sealing device does not need to exist in the opposite side to the roller side of the ball axial direction.

  Further, in the bearing unit of the above embodiment, the roller is the cylindrical roller 3, but in the present invention, the roller may be a roller other than the cylindrical roller such as a tapered roller or a convex roller (spherical roller).

  In the bearing unit of the above embodiment, there is no seal device on the side opposite to the axial ball 4 side of the cylindrical roller 3, but in this invention, the side opposite to the axial ball side of the cylindrical roller is present. In addition, there may be a sealing device for sealing between the outer ring and the inner shaft.

  Moreover, in the bearing unit of the said embodiment, as shown in FIG. 3, in the cross section through which the inclination part 35 of the ball slot 23 passes the bottom of the ball slot 23 of the axial direction of the inner shaft 2, it is a substantially linear shape. However, in the present invention, the inclined portion of the ball groove may have a curved shape in a cross section passing through the bottom of the ball groove in the axial direction of the inner shaft. May be connected to each other. In this invention, when the ball slot has an inclined portion, the inclined portion is a central axis of the inner shaft as it goes to the roller side in the axial direction in a cross section passing through the bottom of the axial ball groove of the inner shaft. Any shape can be used as long as the radial distance from the shape becomes small.

  Further, in the bearing unit of the above-described embodiment, the ball insertion groove 23 has an inclined portion 35 connected to the shoulder portion 38 located on the opposite side to the cylindrical roller 3 side in the axial direction of the ball insertion groove 23. The end of the groove 23 opposite to the outer circumferential raceway groove 22 side in the axial direction was not opened in the axial direction. However, in this invention, the inner shaft does not have a shoulder portion on the opposite side to the roller side in the axial direction of the ball groove, and the side opposite to the outer peripheral race groove side in the axial direction of the ball groove is axial. You may open it. In this case, the ball slot does not have to have an inclined portion, and the position of the end of the outer ring in the axial direction on the ball side is any position in relation to the position of the ball slot. Needless to say, good things.

  Moreover, in the bearing unit of the said embodiment, although the roller holder 5 holding the cylindrical roller 3 and the ball holder 6 holding the ball 4 existed, in this invention, the roller holding a roller. At least one of the cage and the ball cage that holds the balls may not be present, or both of the cages may not be present.

  Moreover, in the bearing unit of the said embodiment, although the depth of the antiball side collar part 25 was a dimension comparable as the thickness of the chamfering part 31 of the cylindrical roller 3, in this invention, an outer ring and an inner shaft are The depth of each collar part to have may be any depth.

  In the above embodiment, the bearing unit is mounted on the water pump. However, it goes without saying that the bearing unit of the present invention may be mounted on any industrial machine or construction machine other than the water pump. Moreover, it is needless to say that a new embodiment can be constructed by combining two or more of the configurations described in the above embodiments and modifications.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner shaft 3 Cylindrical roller 4 Ball 7 Sealing device 11 Inner circumference cylindrical raceway surface 12 Inner circumference raceway groove 21 Outer circumference raceway raceway 22 Outer circumference raceway groove 23 Ball slotting groove 25 Anti-ball side flange 26 Ball side collar 35 Ball Slant portion of the groove 38 Shoulder portion of the inner shaft 53 Slinger of the sealing device 54 Seal member 57 Cylindrical portion of the slinger

Claims (4)

The outer circumferential raceway surface, the outer circumferential raceway groove, and the ball insertion groove are positioned at an interval in the axial direction of the outer circumferential surface, and the outer circumferential raceway groove is between the outer circumferential raceway surface and the ball insertion groove. An inner shaft preparation step of preparing an inner shaft to be positioned;
A roller arrangement step of arranging a plurality of rollers on the outer circumferential raceway surface of the inner shaft;
After the roller arranging step, the outer ring having an inner circumferential raceway surface and an inner circumferential raceway groove is arranged such that the inner circumferential raceway surface faces the outer circumferential raceway surface in the radial direction of the inner shaft, and An outer ring arranging step of arranging a plurality of rollers between the outer circumferential raceway surface and the inner circumferential raceway surface;
After the outer ring arranging step, a ball arranging step of arranging a plurality of balls between the outer circumferential raceway groove and the inner circumferential raceway groove via the ball insertion groove, Assembly method. An outer ring having an inner circumferential raceway surface and an inner circumferential raceway groove on the inner circumferential surface;
The outer circumferential raceway surface, the outer circumferential raceway groove, and the ball insertion groove are positioned at an interval in the axial direction of the outer circumferential surface, and the outer circumferential raceway groove is between the outer circumferential raceway surface and the ball insertion groove. An inner shaft located,
A plurality of rollers disposed between the inner circumferential raceway surface and the outer circumferential raceway surface;
A plurality of balls disposed between the inner circumferential raceway groove and the outer circumferential raceway groove;
At least one of the outer ring and the inner shaft has a non-ball side flange that overlaps the roller in the axial direction on a side opposite to the ball side in the axial direction of the roller. . The bearing unit according to claim 2,
The inner shaft has the anti-ball part,
The bearing unit according to claim 1, wherein the inner shaft has a ball side flange portion that overlaps the roller in the axial direction on the ball side in the axial direction of the roller. The bearing unit according to claim 2 or 3,
The inner shaft has a shoulder on the opposite side to the roller side in the axial direction of the ball slot,
The ball insertion groove has an inclined portion in which the radial distance from the central axis of the inner shaft decreases as it goes to the roller side in the axial direction,
The bearing unit, wherein the inclined portion is connected to an outer peripheral surface of the shoulder portion.

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