JP5897411B2 - Bearing structure - Google Patents

Description

  The present invention relates to a bearing structure.

  FIG. 4 shows an example of an independent suspension structure on the front side (steering wheel side) of a truck or the like. Reference numeral 1 in FIG. 4 indicates a knuckle that is steered by connecting a tie rod (not shown). A hub 3 for attaching a wheel (not shown) to the spindle 2 is rotatably supported via a unit bearing 4.

  The unit bearing 4 includes an inner race 5 that is fitted around the spindle 2 of the knuckle 1, a rolling element (roller) 6 that is rotatably installed on the outer periphery of the inner race 5, and the inner race 5. An outer race 7 that is disposed on the outer periphery of the outer race 7 so as to freely hold the rolling element 6, and a gap between the outer race 7 and the inner race 5 is closed on both sides in the vehicle width direction so that grease (particularly FIG. It is an assembly in which seals 8 and 9 that contain (not shown) are unitized in advance.

  The unit bearing 4 is press-fitted into the inner peripheral portion of the hub 3 so that the outer race 7 is tightly fitted with the inner peripheral surface of the hub 3. On the outer side in the width direction (on the right side in FIG. 4), a locking portion 10 is formed for locking and positioning with a step 2 a formed on the inner peripheral surface of the hub 3.

  On the other hand, the inner race 5 has a gap fit (loose fit) in consideration of workability with respect to the spindle 2 of the knuckle 1, and the inner race 5 abuts against the abutment surface 11 of the knuckle 1 to oppose it. It is fixed by tightening with a spindle nut 12 from the side.

  Here, a pulsar ring 13 having a large number of teeth 13a formed on the side face toward the inner side in the vehicle width direction is press-fitted and fixed to the outer periphery of the end of the hub 3 on the inner side in the vehicle width direction (left side in FIG. 4). And detected and counted by a non-contact sensor (not shown: arranged at a phase different from the cross section shown) that captures the passage of the teeth 13a of the pulsar ring 13 as a change in the magnetic field. The number can be monitored.

  That is, recent vehicles are equipped with an antilock brake system (hereinafter referred to as ABS) that prevents wheels from being locked during brake operation. In this type of ABS, Therefore, the pulsar ring 13 is provided on the hub 3 that rotates integrally with the wheel.

  Further, a spider 15 for supporting the brake shoe 14 is attached to the knuckle 1 side facing the pulsar ring 13 in the vehicle width direction, and the brake shoe 14 is provided outside the hub 3 in the vehicle width direction. A brake drum 16 for generating a braking force by being pressed is attached.

  Further, in the example shown here, a step portion 15a is formed on the inner peripheral portion of the spider 15, so that interference with the pulsar ring 13 is reliably avoided through a required clearance. .

  As prior art document information related to this type of bearing structure, there is the following Patent Document 1 and the like.

Japanese Patent Laid-Open No. 2004-255862

  However, the conventional pulsar ring 13 has a short cylindrical shape formed with a uniform diameter in the axial direction, and when a malfunction occurs in the seal 8 and grease leaks from the unit bearing 4, When the hub 3 is connected to the pulsar ring 13 and the pulsar ring 13 rotates during traveling, the grease may scatter to the surroundings, and the grease may adhere to the brake shoe 14 or the brake drum 16 to reduce the brake performance. there were.

  For this reason, it is necessary to add a deflector 17 to the spider 15 to take measures to prevent the grease from adhering to the brake shoe 14 and the brake drum 16, but since the direction of the grease scattered from the pulsar ring 13 cannot be predicted, a wide range is required. There is a problem that a large deflector 17 capable of covering all of the above needs to be attached, and the attachment of such a large deflector 17 increases the number of parts and the number of assembly steps, which inevitably increases the cost and increases the work load. It was.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bearing structure capable of preventing grease from being scattered from the pulsar ring to the surroundings without attaching a deflector.

The present invention provides a bearing structure in which a hub is rotatably fitted and supported via a bearing on a shaft portion that supports a wheel, and a pulsar ring is integrally fitted and fixed to an outer peripheral portion of the hub. Radial direction with respect to the existing member so that the diameter continuously increases toward the inner side in the vehicle width direction and the outermost edge thereof is covered in the radial direction by an existing member other than the brake shoe or brake drum on the fixed side It is characterized by being arranged in the vicinity .

  Thus, if the grease leaked from the bearing due to the malfunction of the seal reaches the pulsar ring through the hub and the centrifugal force acts on the grease by the rotation of the pulsar ring, the grease is Since it gathers at the outermost edge part of the pulsar ring and scatters radially outward from the outermost edge part, all of the scattered grease is shielded by the existing members on the fixed side to prevent a widespread scattering to the periphery. Will be.

  In other words, the conventional pulsar ring has a short cylindrical shape with a uniform diameter in the axial direction, so the direction of the grease scattered from the pulsar ring is unspecified and has spread over a wide range. If the ring has a shape in which the diameter continuously increases toward the inside in the vehicle width direction, the position at which the grease scatters is specified at the outermost edge of the pulsar ring, and the direction in which the grease scatters is radially outward from the outermost edge. Since the outermost edge part of the pulsar ring is arranged so as to be covered in the radial direction by the existing member on the fixed side, all the grease scattered from the outermost edge part of the pulsar ring can be shielded. It becomes possible.

  Further, in the present invention, the shaft portion that supports the wheel is preferably a knuckle spindle, and the existing member is preferably a spider for supporting the brake shoe. It becomes possible to prevent the grease from adhering to the shoe or the brake drum on the hub side.

  According to the bearing structure of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, even if the grease leaks from the bearing due to a malfunction of the seal or the like, the grease that has reached the pulsar ring through the hub has been removed. Since scattering can be shielded by existing members on the fixed side to prevent scattering to a wide area to the periphery, it is not necessary to install a large deflector, thereby reducing the number of parts and assembly man-hours Therefore, it is possible to avoid an increase in cost and an increase in work load.

  (II) According to the invention described in claim 2 of the present invention, it is possible to prevent the grease from adhering to the brake shoe on the spider side or the brake drum on the hub side, and to reduce the brake performance due to the adhesion of the grease. It can be avoided.

It is sectional drawing which shows an example of the form which implements this invention. It is a single-piece figure of the pulsar ring of FIG. It is sectional drawing which shows the modification of the pulsar ring of FIG. It is sectional drawing which shows a prior art example.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show an example of an embodiment for carrying out the present invention, and the portions denoted by the same reference numerals as those in FIG. 4 represent the same items.

  As shown in FIG. 1, the basic structure of the bearing structure of this embodiment is the same as that of the conventional axle structure described above with reference to FIG. 4, and the spindle 2 of the knuckle 1 (the shaft portion that supports the wheel). On the other hand, a hub 3 is rotatably supported via a unit bearing 4 (bearing), and an outer peripheral portion of the hub 3 on the inner side in the vehicle width direction (left side in FIG. 1) is arranged on the inner side in the vehicle width direction. A pulsar ring 18 having a large number of teeth 18a is press-fitted and fixed on the facing side, but as shown in FIG. 2 as a single item diagram, the pulsar ring 18 has a continuous diameter toward the inner side in the vehicle width direction. The outermost edge portion is arranged so as to enter the stepped portion 15a formed on the knuckle 1 side (fixed side) spider 15 (existing member) and be covered in the radial direction. ing.

  Here, the outer peripheral portion of the pulsar ring 18 in the present embodiment is a conical curved surface that forms an upward gradient linearly toward the inner side in the vehicle width direction, but as shown in FIG. It may be a spherical curved surface that forms an upward gradient in an arc.

  Thus, in this case, the grease leaked from the unit bearing 4 due to the malfunction of the seal 8 reaches the pulsar ring 18 through the hub 3, and the centrifugal force is applied to the grease by the rotation of the pulsar ring 18. When this occurs, the grease is collected at the outermost edge of the pulsar ring 18 and scatters radially outward from the outermost edge, so that all of the scattered grease is shielded by the spider 15 and spreads widely to the periphery. Splashing will be prevented.

  That is, since the conventional pulsar ring 13 (see FIG. 4) has a short cylindrical shape formed with a uniform diameter in the axial direction, the direction of the grease scattered from the pulsar ring 13 is unspecified and wide. However, if the pulsar ring 18 has a shape in which the diameter continuously increases toward the inside in the vehicle width direction as in the present embodiment, the position where the grease scatters is specified at the outermost edge of the pulsar ring 18. Further, since the direction in which the grease scatters is specified as the direction from the outermost edge portion toward the radially outer side, if the outermost edge portion of the pulsar ring 18 is covered with the spider 15 in the radial direction, the pulsar ring 18 It is possible to shield all the grease that scatters from the outermost edge.

  Therefore, according to the above-described embodiment, even if the grease leaks from the unit bearing 4 due to the malfunction of the seal 8 or the like, the splashing of the grease reaching the pulsar ring 18 through the hub 3 is spidered. Since it can be shielded by 15 to prevent a wide range of scattering to the surroundings, it is not necessary to install a large deflector 17 (see FIG. 4), thereby reducing the number of parts and the number of assembly steps. As a result, an increase in cost and an increase in work load can be avoided, and adhesion of grease to the brake shoe 14 on the spider 15 side and the brake drum 16 on the hub 3 side can be prevented. It is possible to avoid a decrease in brake performance due to the above.

  Note that the bearing structure of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

1 Knuckle 2 Spindle (shaft supporting the wheel)
3 Hub 4 Unit bearing (bearing)
14 Brake shoe 15 Spider 16 Brake drum 18 Pulsar ring 18a Teeth

Claims (2)

A bearing structure in which a hub is rotatably fitted and supported via a bearing on a shaft portion that supports a wheel, and a pulsar ring is integrally fitted and fixed to an outer peripheral portion of the hub. The diameter is continuously increased gradually toward the surface, and the outermost edge portion is radially adjacent to the existing member so that the outermost edge is covered in the radial direction by an existing member other than the brake shoe or brake drum on the fixed side. A bearing structure characterized by being arranged.   The bearing structure according to claim 1, wherein the shaft portion that supports the wheel is a knuckle spindle, and the existing member is a spider for supporting the brake shoe.

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