Bearing

A bearing includes a main body, a plurality of first magnetic members, a plurality of second magnetic members, and a plurality of friction members. The main body defines a pivot hole, and a plurality of first receiving portions and a plurality of second receiving portions around the pivot hole. Each of the second receiving portions defines a cutout. The first magnetic members are received in the first receiving portions. The second magnetic members together with the friction members are received in the second receiving portions, thus generating a repelling force between the first magnetic members and the second magnetic members to impel the friction members to partially extend out of the cutouts.

BACKGROUND

1. Technical Field

The present disclosure relates generally to bearings and, more particularly, to a bearing for a computer.

2. Description of Related Art

Referring toFIG. 5, a bearing10includes a main body11and a rotating assembly12sleeved on and fixed to the main body11. The main body11defines a pivot hole (not labeled), in which a transmission shaft13is received. A sidewall defining the pivot hole defines three receiving grooves112. An inner surface of each receiving groove112defines a through hole113throughout the main body11. A sliding member114is slidably received in each receiving groove112, and a spring115is positioned in each through hole113. A wedge block116and a sleeve117are connected to opposite ends of each spring115respectively. The sleeve117resists the sliding member114to the inner surface of the receiving grooves112driven by the elastic force of the spring115. When the main body11rotates together with the rotating assembly12, a friction force is generated between the sliding member114and the transmission shaft13, thereby driving the transmission shaft13to rotate.

However, the springs115, the wedge blocks116, the sleeves117and the sliding members114are arranged radially, thus the bearing10is relatively large.

Therefore, there is room for improvement within the art.

DETAILED DESCRIPTION

Referring toFIGS. 1 and 2, an embodiment of a bearing30includes a main body31, a plurality of first magnetic members32, a plurality of second magnetic members33, a plurality of friction members34, two gears35, and a plurality of fixing members36.

The main body31defines a circular pivot hole311in a center, and includes a plurality of first receiving portions312and second receiving portions313around the pivot hole311. Each first receiving portion312is adjacent to one corresponding second receiving portion313. Each second receiving portion313defines a cutout314communicating with the pivot hole311. In the illustrated embodiment, the main body31is substantially cylindrical, and defines six first receiving portions312and six second receiving portions313. The main body31further defines a plurality of fixing holes315between the first receiving portions312and the second receiving portions313.

The first magnetic members32and the second magnetic members33are substantially rectangular elongated bars, with a north pole and a south pole on opposite ends. The friction members34are substantially cylindrical. The first magnetic members32are snugly received in the first receiving portions312. One second magnetic member33together with one friction member34is received in one corresponding second receiving portion313. The friction member34is positioned at a side of the second receiving portion313defining the cutout314. When the second magnetic member33and the friction member34are received in the second receiving portion313, the second receiving portion313also has some free space. That is, a sum volume of the second magnetic member33and the friction member34is less than a volume of the second receiving portion313. The north pole of the first magnetic members32and the north pole of the second magnetic member33are located on a same end of the main body31, and the south pole of the first magnetic members32and the south pole of the second magnetic member33are located on the other end of the main body31, thereby generating a repelling force to impel the friction member34to, and partially extend out of the cutout314. In the illustrated embodiment, the first magnetic members32and the second magnetic members33are electromagnets.

Each gear35defines a connecting hole351. The fixing members36extend through the connecting holes351of the gear35and are received in the fixing holes315of the main body31, to fix two gears35on opposite ends of the main body31.

Referring toFIGS. 2 through 4, in use, a transmission shaft50extends through the pivot hole311of the bearing30, and parts of the friction members34extending out of the cutout314resist the transmission shaft50. When the gears35are rotated by an external force, the bearing30rotates together with the gears35, and a friction force is produced between the transmission shaft50and the friction members34, such that the transmission shaft50is rotated by the friction force.

Since the first receiving portions312and six second receiving portions313are pivotally defined in the bearing30, and the first magnetic members32and the second magnetic members33are respectively received in the first receiving portions312and six second receiving portions313, the transmission shaft50and the friction members34maintain contact due to the repelling force between the first magnetic members32and the second magnetic members33. There is no need to radially position elastic members in the bearing30to produce elastic force. Therefore, the bearing30can be small. Furthermore, the repelling force between the first magnetic members32and the second magnetic members33can be maintained over time, unlike the elastic members which are easily deformed. Thus, the bearing30provides extended service life.

It should be pointed out that the main body31may only pivotally define one first receiving portion312and one second receiving portion313. Correspondingly, the bearing30has one first magnetic members32received in the first receiving portion312and one second magnetic member33together with one friction member34received in the second receiving portion313.