JP5765607B2 - Vehicle wheel hub - Google Patents

Description

  The present invention relates to a wheel hub of a vehicle to which a wheel is mounted.

  When the wheel is fitted to the wheel hub and rust occurs on the wheel hub fitting surface (outer surface such as bore or spigot) close to or in contact with the inner peripheral surface of the wheel shaft hole, tire replacement, etc. When the wheel is detached, the wheel shaft hole and the fitting surface of the hub adhere to each other, and an excessive force is required to remove the wheel.

  In order to eliminate such inconvenience, Japanese Patent Laid-Open No. 10-81103 discloses a structure in which a guide ring made of a member having excellent corrosion resistance and in contact with a wheel shaft hole is coupled to a fitting surface of a wheel hub. Have been described.

  Japanese Patent Application Laid-Open No. 2003-237301 describes a structure in which an annular elastic body is fixed to a fitting surface of a wheel hub and an inner peripheral surface of a wheel shaft hole is brought into contact with the elastic body.

JP-A-10-81103 JP 2003-237301 A

  However, in the structure described in Japanese Patent Laid-Open No. 10-81103, the guide ring must be coupled to the wheel hub by post-processing, resulting in an increase in the number of manufacturing steps of the wheel hub and an increase in cost.

  Moreover, in the structure described in Unexamined-Japanese-Patent No. 2003-237301, the rotation center of a wheel and a wheel hub may shift | deviate by deformation | transformation of an elastic body, and there exists a possibility of causing a vehicle vibration.

  The present invention has been made in view of the above circumstances, and is intended to improve the workability of removing a wheel while suppressing the increase in the number of manufacturing steps of the wheel hub and the occurrence of deviation of the rotation center between the wheel and the wheel hub. The purpose is to provide a wheel hub that can be used.

In order to achieve the above object, a wheel hub of the present invention is arranged around a hub shaft portion supported by an axle and a rotation shaft of the hub shaft portion, and a wheel shaft hole is fitted from the outside in the vehicle width direction. A plurality of inlay portions are integrally provided. The inlay portion has a fitting surface that is intermittently disposed along the circumferential surface around the rotation axis of the hub shaft portion and is close to or in contact with the inner circumferential surface of the wheel shaft hole. The fitting surface of the spigot portion extends in the circumferential direction concentrically with the rotation shaft of the hub shaft portion, and the fitting surface of the spigot portion and the wheel shaft hole of the wheel are fitted with the wheel shaft hole fitted to the spigot portion. A plurality of linear grooves that reduce the contact area with the inner peripheral surface are formed side by side in the vehicle width direction . The linear groove is concavely curved from the mating surface so that the slope on the inner side in the vehicle width direction, which is the fitting direction of the wheel, is a sharp curved surface, and the slope on the outer side in the vehicle width direction, which is the removal direction, is a gentle curved surface. To do.

  In the above configuration, since the wheel is securely centered and held with respect to the wheel hub by the region where the linear groove is not formed in the fitting surface of the inlay portion, the rotation center of the wheel and the wheel hub is displaced. Occurrence is suppressed.

  Since the water that has entered between the fitting surface of the spigot part and the inner peripheral surface of the wheel while the vehicle is running is discharged from the linear groove, the occurrence of rust is suppressed.

  Since the contact area between the fitting surface of the spigot part and the inner peripheral surface of the wheel is reduced by the linear groove, the fitting surface and the inner peripheral surface even when rust is generated on the fitting surface or the inner peripheral surface The adhesion force with the wheel can be kept low, and the detachability of the wheel is improved.

  Since the linear groove also functions as a grease reservoir, the grease can function reliably when the wheel is removed, and the detachability of the wheel is improved.

  Since the linear groove also functions as a rust receiving groove that drops off during wheel removal, the movement of the inner peripheral surface of the wheel is prevented from being hindered by the dropped rust, improving the wheel attachment / detachment workability. To do.

  Further, since the linear groove can be formed at the time of forming the wheel hub (similar to other parts at the time of cutting after casting), the manufacturing man-hour of the wheel hub is not increased.

  According to the present invention, it is possible to improve the workability of removing the wheel while suppressing the increase in the number of manufacturing steps of the wheel hub and the occurrence of the deviation of the rotation center between the wheel and the wheel hub.

It is the front view which looked at the wheel hub of this embodiment from the vehicle width direction outside. It is a principal part expansion perspective view of the wheel hub of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 showing a wheel hub on which a wheel is mounted.

  Hereinafter, a rear wheel hub according to an embodiment of the present invention will be described with reference to FIGS.

  The wheel hub 1 is integrally provided with a cylindrical hub shaft portion 2, a disk-shaped flange portion 3 extending from the hub shaft portion 2 in the outer peripheral direction, and a plurality of spigot portions 4.

  The hub shaft 2 is rotatably supported by a rear axle (not shown). An aluminum wheel (inner tire wheel 5 and outer tire wheel 6) is stacked on the outer surface of the flange portion 3 in the vehicle width direction, and a braking drum (not shown) is stacked on the inner surface. Fastened with a nut (not shown). As a result, the wheels 5 and 6 and the brake drum are coupled via the flange portion 3. A rim (not shown) for supporting a tire (not shown) is coupled to the peripheral edges of the wheels 5 and 6.

  The plurality of spigot portions 4 are located on the outer peripheral side of the outer peripheral edge of the hub shaft portion 2, on the inner peripheral side of the outer peripheral edge of the flange portion 3, and on the outer side in the vehicle width direction (left side in FIG. 3). Are arranged in a stepping stone shape at a predetermined interval around the rotation shaft of the hub shaft portion 2 (wheel hub 1).

  An outer surface (fitting surface) 4 a on the base end side of the inlay part 4 is intermittently disposed along a circumferential surface around the rotation axis of the hub shaft part 2. The shaft holes 7 and 8 of the wheels 5 and 6 are fitted to the inlay part 4 from the outside in the vehicle width direction. The outer surface 4a of the inlay part 4 and the inner peripheral surfaces 7a and 8a of the shaft holes 7 and 8 of the wheels 5 and 6 are fitted. And oppose each other. Grease is applied to the gap between the outer surface 4a of the inlay portion 4 and the inner peripheral surfaces 7a and 8a of the wheels 5 and 6. A step 10 is provided between the outer surface 4a on the proximal end side of the inlay part 4 and the outer surface 4b on the distal end side, and the outer surface 4b on the distal end side is a rotation shaft of the hub shaft portion 2 rather than the outer surface 4a on the proximal end side. It is located on the side (inner diameter side of the wheel hub 1).

  In order to support the wheels 5 and 6 concentrically with respect to the wheel hub 1, a gap between the outer surface 4 a of the spigot part 4 and the inner peripheral surfaces 7 a and 8 a of the wheels 5 and 6 is a minute distance (for example, 0.2 to 0). The outer surface 4a of the spigot 4 and the inner peripheral surfaces 7a and 8a of the wheels 5 and 6 are close to or in contact with each other. FIG. 3 shows a state in which both are in contact.

  On the outer surface 4a of each spigot portion 4, circumferential linear grooves 9 extending concentrically with the rotating shaft of the hub shaft portion 2 and extending substantially orthogonal to the fitting direction of the wheels 5 and 6 are arranged in the vehicle width direction. A plurality (two) are formed. The position and size of the linear groove 9 are set so as to partially overlap the inner peripheral surfaces 7a, 8a of the wheels 5, 6. Further, the cross-sectional shape of the linear groove 9 is curved from the outer surface 4a of the spigot part 4, the inclination in the vehicle width direction inner side as the fitting direction is steep, and the inclination in the vehicle width direction outer side as the removal direction is gentle. It is curved. That is, the outer surface 4a of the inlay portion 4 is formed in a so-called washing plate shape that can be smoothly slid in the removing direction than sliding in the fitting direction.

  In the present embodiment, since the wheels 5 and 6 are securely centered and held with respect to the wheel hub 1 by the region where the linear groove 9 is not formed in the outer surface 4a of the inlay portion 4, the wheels 5 and 6 And the occurrence of deviation of the rotation center of the wheel hub 1 is suppressed.

  Since the water that has entered between the outer surface 4a of the spigot part 4 and the inner peripheral surfaces 7 and 8 of the wheels 5 and 6 during traveling of the vehicle is discharged from the linear groove 9, the occurrence of rust is suppressed.

  Since the contact area between the outer surface 4a of the inlay part 4 and the inner peripheral surfaces 7 and 8 of the wheels 5 and 6 is reduced by the linear grooves 9, rust is generated on the outer surface 4a and the inner peripheral surfaces 7 and 8. In addition, the fixing force between the outer surface 4a and the inner peripheral surfaces 7 and 8 can be kept low, and the detachability workability of the wheels 5 and 6 is improved.

  Since the linear groove 9 also functions as a grease reservoir, the grease can function reliably when the wheels 5 and 6 are removed, and the detachability of the wheels 5 and 6 is improved.

  Since the linear groove 9 also functions as a rust housing groove that drops during removal of the wheels 5 and 6, movement of the inner peripheral surfaces 7 and 8 of the wheels 5 and 6 may be hindered by the dropped rust. It is suppressed and the workability of attaching and detaching the wheels 5 and 6 is improved.

  In particular, in the present embodiment, a plurality of linear grooves 9 are formed side by side in the vehicle width direction, and the cross-sectional shape of the linear grooves 9 is steeply inclined on the inner side in the vehicle width direction, which is the fitting direction, and in the removal direction. The outer surface 4a of the inlay part 4 is so-called that the sliding in the removal direction can be performed more smoothly than the sliding in the fitting direction. Since it is formed in the shape of a washing plate, it is difficult for the inner peripheral surfaces 7 and 8 of the wheels 5 and 6 to be caught on the outer surface 4a of the spigot 4 when the wheels 5 and 6 are removed, and the workability of attaching and detaching the wheels 5 and 6 is further improved. To do.

  Moreover, since the linear groove | channel 9 can be formed at the time of shaping | molding of the wheel hub 1 (similar to another site | part at the time of the cutting after casting), the increase in the manufacturing man-hour of the wheel hub 1 is not caused.

  In the above embodiment, the wheel hub 1 on the rear side has been described. However, the present invention can also be applied to a wheel hub on the front side. Moreover, although the aluminum wheels 5 and 6 have been described, the material thereof is not limited. For example, the steel wheels 5 and 6 (shown by a two-dot chain line in FIG. 3) are thinner than those made of aluminum. ). Moreover, the number of the linear grooves 9 is not limited to two, and may be one or three or more. Moreover, the shape of the linear groove | channel 9 is not limited above, A simple circular arc shape may be sufficient.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The present invention is applicable to wheel hubs of various vehicles.

1: Wheel hub 2: Hub shaft portion 3: Flange portion 4: Inner portion 4a: Outer surface (fitting surface) of the inner portion
5, 6: Wheel 7, 8: Shaft hole 7a, 8a: Inner peripheral surface 9: Linear groove 10: Step

Claims (1)

A hub shaft portion supported by the axle and a plurality of inlay portions arranged around the rotation shaft of the hub shaft portion and fitted with a shaft hole of the wheel from the outside in the vehicle width direction are integrally provided. The wheel hub of the vehicle has a fitting surface that is intermittently disposed along a circumferential surface centered on the rotation axis of the hub shaft portion and has a fitting surface that is close to or in contact with the inner circumferential surface of the wheel shaft hole. There,
The fitting surface of the spigot portion extends in the circumferential direction concentrically with the rotation shaft of the hub shaft portion, and the fitting surface of the spigot portion in a state where the shaft hole of the wheel is fitted to the spigot portion. A plurality of linear grooves are formed side by side in the vehicle width direction to reduce the contact area with the inner peripheral surface of the wheel shaft hole ,
The linear groove extends from the fitting surface so that the slope on the inner side in the vehicle width direction, which is the fitting direction of the wheel, is a sharp curved surface, and the slope on the outer side in the vehicle width direction, which is the removal direction, is a gentle curved surface. A vehicle wheel hub characterized by being curved in a concave shape .

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