JP4983145B2 - Hub structure and hub assembly method - Google Patents

Description

  The present invention relates to a hub structure including a hub that is rotatably supported on an axle housing via an inner bearing, and a hub assembly method for assembling the hub to the axle housing.

  Conventionally, a hub structure has been used to support a drive wheel of a vehicle. As such a hub structure, for example, as described in Patent Document 1, a hub fixed to a wheel and an axle shaft is rotatably supported by an axle housing via an inner bearing and an outer bearing. There is something assembled.

Further, as another hub structure, for example, as described in Patent Document 2, there is a structure in which an inner bearing is supported by caulking of the end face of the hub.
Japanese Patent Laid-Open No. 10-058906 JP 2002-205504 A

  However, in the hub structure disclosed in Patent Document 1, for example, the inner bearing outer race is fixed to the hub, but the inner bearing inner race is only inserted inside the outer race. For this reason, when the hub is assembled to the axle housing, the inner race of the inner bearing moves and falls off, so the operator must insert the axle housing into the hub while holding the inner race by hand. Don't be. Further, when the inner bearing is inserted in a place where it is difficult for the operator to hold it by hand, it is difficult to press the inner race itself, and it is very difficult to assemble the hub to the axle housing.

  Further, in the hub structure of Patent Document 2, since the inner bearing is supported by caulking of the end face of the hub, not only is it troublesome to perform caulking work, but also adjustment of the tightening degree of the bearing becomes difficult.

  Accordingly, an object of the present invention is to provide a hub structure and a hub assembling method capable of easily assembling the hub and the axle housing.

Accordingly, the hub structure of the present invention has a housing housing portion into which the axle housing is inserted, a hub that is rotatably supported by the axle housing via an inner bearing, a holding portion that is fitted into the housing housing portion, and a holding device. a ring-shaped spacer having a flange portion which is projected to the part outer peripheral surface is engaged with the hub, with, inner bearing, the outer race fixed to an inner circumferential surface of the hub, is inserted into the housing accommodating section and the inner race in contact with the outer peripheral surface of the axle housing, provided with a spacer, by the holding portion is a flange portion is fitted into the housing accommodating portion is engaged with the hub, play between the holding portion and the inner bearing And the inner race is prevented from falling off from the hub by the holding portion .

In such a hub structure, when assembling the hub and the axle housing, the spacer is such that the flange portion of the ring-shaped spacer is locked to the hub in a state where the inner bearing is inserted into the housing housing portion of the hub. The holding portion is fitted into the housing storage portion. Then, the inner race of the inner bearing is prevented from slipping and dropping with respect to the hub without being restricted by the spacer, so that it is particularly useful when inserting the axle housing into the housing housing portion of the hub. No longer needs to hold the inner race by hand. Further, it is not necessary to perform a caulking operation of the hub for supporting the inner bearing on the hub. Thereby, the assembly of the hub and the accelerator housing can be easily performed, and the workability of the assembly work can be improved.

The inner bearing further includes a rotating body interposed between the outer race and the inner race, and a rotating body holder that holds the rotating body, and the inner race, the rotating body, and the rotating body holder are integrally configured. The holding part preferably has an inner diameter smaller than the outer diameter of the rotating body holder. Since the inner race, the rotating body, and the rotating body retainer are integrally formed , the inner race of the inner bearing is reliably prevented from falling off by making the inner diameter of the holding portion smaller than the outer diameter of the rotating body retainer. be able to.

  Further, it is desirable that the inner diameter of the hub and the outer diameter of the holding portion have an intermediate fit relationship. Since the inner diameter of the hub and the outer diameter of the holding portion are in an intermediate fit relationship, the holding portion of the spacer can be easily fitted into the housing housing portion by simple driving with an appropriate force. Therefore, it is possible to prevent the spacer from being detached from the hub and to prevent damage to the spacer and the hub.

The hub assembly method of the present invention is to prepare the hub, inner bearing and spacer described above, insert the inner bearing into the housing housing portion of the hub, and hold the spacer so that the flange portion of the spacer is locked to the hub. see write fitted the parts in the housing accommodating portion, by inserting the axle housing to the housing accommodating portion in this state, characterized in that assembling the hub and the axle housing.

In such a hub assembly method, with the inner bearing inserted into the housing housing portion, the spacer holding portion is fitted into the housing housing portion so that the flange portion of the ring-shaped spacer is locked to the hub. Like that. Then, the inner race of the inner bearing is prevented from slipping and falling off with respect to the hub without being restricted by the spacer, so that when the axle housing is inserted into the housing housing portion, the operator particularly There is no need to hold the inner race by hand. Further, it is not necessary to perform a caulking operation of the hub for supporting the inner bearing on the hub. Thereby, the assembly of the hub and the accelerator housing can be easily performed, and the workability of the assembly work can be improved.

  As described above, according to the present invention, the hub and the axle housing can be easily assembled. Thereby, the productivity of a device (for example, a drive shaft support device) provided with the hub structure of the present invention can be improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a hub structure according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a cross-sectional view showing the configuration of the hub structure 1 according to the present embodiment, and FIG. 2 is a cross-sectional view showing the configuration of the hub structure 1 without the axle housing 2.

  The hub structure 1 has a hub 3 that is fixed by an axle shaft and wheels and bolts (not shown). A housing housing portion 4 into which the axle housing 2 is inserted is formed in the hub 3. The hub 3 is rotatably supported by the axle housing 2 via an inner bearing 5 located on the inner side in the axial direction and an outer bearing 6 located on the outer side in the axial direction. The hub 3 and the axle housing 2 are made of cast iron, for example.

  The inner bearing 5 includes an outer race 8 that is press-fitted and fixed to the inner peripheral surface of the hub 3, an inner race 14 that contacts the outer peripheral surface of the axle housing 2, and a plurality of rollers that are interposed between the outer race 8 and the inner race 14. A bearing (rotating body) 10 and a cage (rotating body holder) 12 that holds a plurality of roller bearings 10 at predetermined intervals are configured. A groove 16 is provided on the outer peripheral surface of the inner race 14, and the inner race 14, the roller bearing 10, and the cage 12 are integrally formed by fitting the roller bearing 10 into the groove 16.

  The outer bearing 6 includes an outer race 9 that is press-fitted and fixed to the inner peripheral surface of the hub 3, an inner race 15 that contacts the outer peripheral surface of the axle housing 2, and a plurality of rollers that are interposed between the outer race 9 and the inner race 15. It comprises a bearing 11 and a cage 13 that holds a plurality of roller bearings 11 at predetermined intervals. A groove 17 is provided on the outer peripheral surface of the inner race 15, and the inner race 15, the roller bearing 11, and the cage 13 are integrally formed by fitting the roller bearing 11 into the groove 17.

  A ring-shaped spacer 7 for supporting the inner bearing 5 with respect to the hub 3 is disposed inside the hub 3. The spacer 7 is formed of a general steel material from the viewpoint of cost and the like, for example.

  FIG. 3 is a view showing the structure of the spacer 7. 3A shows a perspective view of the spacer 7, and FIG. 3B shows a cross-sectional view of the spacer 7.

  1 to 3, the spacer 7 includes a ring-shaped holding portion 18 and a ring-shaped flange portion 19 protruding from the outer peripheral surface of the holding portion 18. The holding portion 18 is fitted into the inner opening portion of the housing housing portion 4 from the inner opening end surface 20 side of the hub 3, and the flange portion 19 is locked to the inner opening end surface 20 of the hub 3.

  In the state where the spacer 7 is incorporated in the hub 3 as described above, the holding portion 18 does not press the cage 12 of the inner bearing 5 and is dimensioned so that a predetermined amount of gap (play) is formed between the holding portion 18 and the cage 12. have. If there is no gap between the holding portion 18 and the cage 12, the holding portion 18 presses the cage 12 and the cage 12 is difficult to rotate, and the gap between the holding portion 18 and the cage 12 is too large. As a result, the wobble of the cage 12 increases. Therefore, the optimal dimension of the holding part 18 is set so that the cage 12 can play appropriately. The outer diameter of the holding portion 18 is a dimension that has a relationship of an intermediate fit with the inner diameter of the hub 3 into which the holding portion 18 is fitted (the inner diameter of the inner opening portion of the housing housing portion 4). That is, the outer diameter of the holding portion 18 and the inner diameter of the hub 3 are almost the same. The inner diameter of the holding portion 18 is smaller than the outer diameter of the cage 12.

  A stepped portion 21 for restraining and supporting the inner race 14 of the inner bearing 5 is formed in the axle housing 2.

  An attachment member 22 is detachably attached to the inner portion of the hub 3 so as to cover the inner opening end face 20 of the hub 3. A packing 23 is interposed between the attachment member 22 and the axle housing 2 so that the lubricating oil for bearings filled between the hub 3 and the axle housing 2 does not leak out.

  Subsequently, a method of assembling the hub 3 to the axle housing 2 will be described. First, the outer race 8 of the inner bearing 5 and the outer race 9 of the outer bearing 6 are inserted into the hub 3 from both sides, and are press-fitted and fixed to the inner peripheral surface of the hub 3. Then, the inner race 14, the roller bearing 10, and the cage 12 of the integrally formed inner bearing 5 are inserted into the housing housing portion 4 from the inner opening end face 20 side of the hub 3, and arranged on the radially inner side of the outer race 8. .

  Thereafter, the spacer 7 is attached to the hub 3. Specifically, with the holding portion 18 of the spacer 7 fitted in the inner opening portion of the hub 3, the flange portion 19 of the spacer 7 is driven into the inner opening end surface 20 of the hub 3 by driving the spacer 7 toward the inner bearing 5 side. The holding portion 18 is fitted into the housing accommodating portion 4 of the hub 3 until it comes into contact with the housing 3. At this time, since the outer diameter of the holding portion 18 and the diameter of the inner opening portion of the hub 3 are in an intermediate fit relationship, the hub 3 and the holding portion 18 are fitted with an appropriate holding force.

  Further, since the flange portion 19 is provided in the spacer 7, the holding portion 18 is prevented from deeply fitting into the housing housing portion 4 and hitting the cage 12. Therefore, in a state where the spacer 7 is incorporated in the hub 3, the cage 12 of the inner bearing 5 is held by the holding portion 18 with appropriate play. Therefore, the rotation of the cage 12 is not limited by the spacer 7, and the rotation of the inner race 14 and the roller bearing 10 configured integrally with the cage 12 is not limited by the spacer 7.

  In this state, even if the inner race 14, the roller bearing 10, and the cage 12 are displaced from the outer race 8 and fall off the hub 3, the displacement of the cage 12 is prevented by the spacer 7. Moreover, since the inner diameter of the spacer 7 is smaller than the outer diameter of the cage 12, the cage 12 cannot escape from the spacer 7. For this reason, the inner race 14 and the roller bearing 10 which are integrally formed with the cage 12 cannot naturally escape from the spacer 7, and the state supported by the spacer 7 is maintained.

  Thereafter, the attachment member 22 is attached to the outer peripheral surface of the hub 3, and the packing 23 for sealing the bearing lubricating oil is attached to the attachment member 22. In this state, the axle housing 2 is inserted into the housing housing portion 4 of the hub 3 from the opening of the attachment member 22, and the axle shaft (not shown) housed in the axle housing 2 and the hub 3 are connected by bolts or the like. To do.

  On the other hand, the inner race 15, the roller bearing 11, and the cage 13 of the outer bearing 6 that are integrally formed are inserted into the housing housing portion 4 of the hub 3 after the axle housing 2 is inserted into the housing housing portion 4 of the hub 3. And assembled to the outer race 9.

  FIG. 4 is a cross-sectional view showing a configuration of a conventional general hub structure 24 not provided with the spacer 7 as a comparative example.

  In the hub structure 24, the outer race 8 of the inner bearing 5 is press-fitted and fixed to the inner peripheral surface of the hub 3, but the inner race 14, the roller bearing 10, and the cage 12 that are integrally formed are located inside the outer race 8. It is only inserted and is not held by other members. For this reason, before the axle housing 2 is inserted into the hub 3, the inner race 14, the roller bearing 10, and the cage 12 may be displaced from the outer race 8 and fall off the hub 3. Therefore, the operator needs to insert the axle housing 2 into the hub 3 while holding the inner race 14, the roller bearing 10 and the cage 12 by hand.

  Further, when the attachment member 22 is attached to the hub 3, it is difficult to directly hold the inner race 14, the roller bearing 10, and the cage 12 from the outside of the hub 3 (on the attachment member 22 side). For this reason, in order to assemble the hub 3 to the axle housing 2, a considerable skill of the operator is required.

  On the other hand, according to the hub structure 1 and the hub assembling method according to the present embodiment, when the hub 3 and the axle housing 2 are assembled, the inner bearing 5 is inserted into the housing housing portion 4 of the hub 3. Since the holding portion 18 of the spacer 7 is fitted into the housing housing portion 4 of the hub 3 until the flange portion 19 of the spacer 7 is locked to the inner opening end surface 20 of the hub 3, the roller bearing of the inner bearing 5 is provided. 10, the cage 12 and the inner race 14 are supported by the spacer 7. Therefore, the inner race 14, the roller bearing 10 and the cage 12 of the inner bearing 5 are prevented from shifting and dropping with respect to the outer race 8, so that even if the operator does not hold the inner race 14 or the like by hand, the axle The housing 2 can be smoothly inserted into the housing housing portion 4 in the hub 3. Thereby, the assembly | attachment of the hub 3 and the axle housing 2 can be performed easily, and the workability | operativity of an assembly work can be improved.

  As described above, the material of the hub 3 is cast iron, whereas the material of the spacer 7 is a general steel material. For this reason, if the inner diameter of the hub 3 and the outer diameter of the holding portion 18 of the spacer 7 are in an interference fit relationship, the spacer 7 may be scraped and damaged. On the other hand, if the inner diameter of the hub 3 and the outer diameter of the holding portion 18 of the spacer 7 are in a clearance fit, the holding portion 18 may not be securely fitted into the housing housing portion 4 of the hub 3. On the other hand, in the present embodiment, the inner diameter of the hub 3 and the outer diameter of the holding portion 18 are in an intermediate fit relationship. Can be fitted. Therefore, the spacer 7 does not come off from the hub 3, and breakage / damage of the spacer 7 or the hub 3 can be prevented.

  The present invention is not limited to the above embodiment. For example, the outer race 8 and the outer race 9 do not necessarily need to be press-fitted and fixed to the inner peripheral surface of the hub 3. It may be. Therefore, the spacer 7 may support the entire inner bearing 5 including the outer race 8.

  Further, the rotating bodies of the inner bearing 5 and the outer bearing 6 are not particularly required to be the roller bearing 10 and the roller bearing 11, and may be, for example, a ball bearing.

  The shape of the spacer 7 is not particularly limited to a complete ring shape as long as the inner bearing 5 can be supported before the hub 3 and the axle housing 2 are assembled. For example, a notch is provided in a part. C-shape (substantially ring shape) may be used.

  Further, the flange portion 19 of the spacer 7 does not necessarily have a ring shape as long as it protrudes from the outer peripheral surface of the holding portion 18 so as to engage with the inner opening end surface 20 of the hub 3, for example, intermittently formed. May be.

It is sectional drawing which showed the structure of the hub structure which concerns on this embodiment. It is sectional drawing which showed the structure of a state without an axle housing in the hub structure shown in FIG. It is the figure which showed the structure of the spacer shown in FIG. It is sectional drawing which showed the structure of the conventional general hub structure in which the spacer shown in FIG. 1 is not provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hub structure, 2 ... Axle housing, 3 ... Hub, 4 ... Housing accommodating part, 5 ... Inner bearing, 7 ... Spacer, 8 ... Outer race, 10 ... Roller bearing (rotating body), 12 ... Cage (rotating body holder) ), 14 ... inner race, 18 ... holding part, 19 ... flange part, 20 ... inner opening end face.

Claims (4)

A hub having a housing housing portion into which the axle housing is inserted, and a hub rotatably supported by the axle housing via an inner bearing;
A ring-shaped spacer having a holding portion fitted into the housing housing portion, and a flange portion protruding from the holding portion outer peripheral surface and locked to the hub ;
With
The inner bearing includes an outer race fixed to the inner peripheral surface of the hub, and an inner race abutting on the outer peripheral surface of the axle housing inserted into the housing housing portion,
The spacer is configured such that the holding portion is fitted into the housing housing portion and the flange portion is locked to the hub, thereby forming a play between the holding portion and the inner bearing. A hub structure that prevents the inner race from dropping off from the hub. The inner bearing further includes a rotating body interposed between the outer race and the inner race, and a rotating body holder that holds the rotating body, and the inner race, the rotating body, and the rotating body holder include It is configured as one unit,
The holding portion, the hub structure according to claim 1, characterized in that it has a smaller inner diameter than the outer diameter of the rotating body cage. The hub structure according to claim 1, wherein an inner diameter of the hub and an outer diameter of the holding portion have an intermediate fit relationship. Prepare the hub, inner bearing and spacer according to any one of claims 1 to 3,
Inserting the inner bearing into the housing housing of the hub;
See write fitted to the holding portion of the spacer in the housing accommodating portion such that the flange portion of the spacer is engaged with said hub,
In this state, an axle housing is inserted into the housing accommodating portion, and the hub and the axle housing are assembled together.

Images