摘要:
A wheel support bearing assembly, in which the rigidity of an outboard portion thereof can be increased without increasing the weight of the bearing assembly. The wheel support bearing assembly includes outer and inner members and inboard and outboard rows of rolling elements interposed between outboard and inboard raceways defined in the outer and inner members confronting each other. The inner member includes a hub axle having a wheel fitting flange on an outboard side thereof, and an inner race member mounted on an inboard end thereof. The hub axle has an outer diameter measured at a point intermediate between the inboard and outboard rows of rolling elements that is greater than the minimum diameter of the raceway on the inboard side. A pitch circle diameter of the outboard row of rolling elements is greater than the pitch circle diameter of the inboard row of rolling elements.
摘要:
A wheel support bearing assembly includes an outer member, an inner member and double row balls. The inner member includes a hub unit, which has a wheel mounting flange defined in an outer periphery thereof, and an inner ring mounted on the outer periphery of the inboard end of the hub unit. A shoulder is provided in an inner peripheral edge of the inboard end face of the inner ring. A crimped portion, engageable with a stepped face of the shoulder, is provided in the inboard end of the hub unit by diameter expansion. The crimped portion is formed by crimping such diameter expanded portion which is thin walled by providing a hub inner diameter setback in the inner periphery of the inboard end of the hub unit. This thin walled portion is positioned on a side inboardly of the straight line defining a ball contact angle in the inboard raceway surface.
摘要:
A vehicle wheel bearing apparatus has an outer member and an inner member. The inner member has a wheel hub and at least one inner ring fit onto a cylindrical portion of the wheel hub or an outer raceway surface of a constant velocity universal joint. Double row rolling element groups are freely rollably contained between said inner and outer raceway surfaces of the inner member and the outer member. A pitch circle diameter of the ball element group near to the wheel mounting flange is larger than that of the double row ball group away from the wheel mounting flange. A maximum diameter of the outer raceway surface of the smaller diameter side of the double row outer raceway surfaces of the outer member is substantially the same as an inner diameter of a shoulder portion of the outer diameter side. The size of each rolling element of the group near to the wheel mounting flange is different from that of each rolling element of the group away from the wheel mounting flange. The number of rolling elements of the group near to the wheel mounting flange is larger than the number of rolling elements of the group away from the wheel mounting flange.
摘要:
A vehicle wheel bearing apparatus has an outer member and inner member. The inner member includes a wheel hub and inner ring. The outer member and inner member include respective raceway surfaces. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces, respectively, of the outer member and the inner member. At least the inner side rolling elements of the double row rolling elements are tapered rollers. A pitch circle diameter of the inner side rolling elements is set smaller than a pitch circle diameter of the outer side rolling elements. A substantially conical recess is formed at an outer side end portion of the wheel hub. The depth of the recess extends near to a shaft shaped portion beyond the bottom of the inner raceway surface of the wheel hub. The thickness of a portion of the wheel hub where the inner raceway surface is formed is set within a predetermined range. The outer side wall of the wheel hub is formed to have a substantially constant thickness along the inner surface of the recess.
摘要:
A vehicle wheel bearing apparatus has an outer member with a body flange and double row outer raceway surfaces. An inner member includes a wheel hub and an inner ring. They include inner raceway surfaces arranged opposite to the double row outer raceway surfaces. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces. Outer side rolling elements of the double row rolling elements are balls and inner side rolling elements of the double row rolling elements are tapered rollers. A pitch circle diameter of the inner side tapered rollers is set smaller than that of the outer side balls. A substantially conical recess is formed at an outer side end portion of the wheel hub. The depth of the recess extends to at least near the bottom of the inner raceway surface of the wheel hub. The thickness of a portion of the wheel hub where the inner raceway surface is formed is set within a predetermined range. The outer side wall of the wheel hub has a constant thickness substantially along the inner surface of the recess.
摘要:
A vehicle wheel bearing apparatus has a pitch circle diameter of an outer side ball group that is larger than a pitch circle diameter of an inner side ball group. Each corner portion of the outer circumferential surfaces of the inner member is rounded as a smooth circular arc.
摘要:
For sealing devices for vehicle hub bearings formed with a plurality of seal lips, a rolling bearing is provided having cold-resistant sealing devices which exhibit sealability that is especially superior in cold resistance, which is high in followability of the seal lips even if the bearing is rotated for a long period of time at low temperature, and which can prevent entry of foreign matter such as water into the bearing and leakage of grease. In a rubber sealing device A or B retained by one of inner and outer rings 1 and 2 or a stiffener 5 and a sleeve 6 of a rolling bearing, which rotate relative to each other, with its seal lips in sliding contact with the other, a sealing device for a bearing is provided which is made of a rubber material of which the temperature at which the rubber material shows a low-temperature elastic recovery of 10% as specified in a cold-resistant TR test (TR10) is not more than −35° C. Thus, even if the bearing is rotated for a long period of time at low temperature, it is possible to prevent entry of foreign matter such as water into the bearing and leakage of grease. By mounting such sealing devices on e.g. a rolling bearing for a vehicle hub, there is provided a rolling bearing for a hub with cold-resistant sealing devices.