JP2006029370A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing capable of opening a door with light force, and preventing the resistance in closing the door from being reduced too much, when it is used for a slide door of an automobile. <P>SOLUTION: A clockwise-side holding face 15a and an anticlockwise-side holding face 15b of a part of pockets 15 are asymmetrically formed to make the torque in clockwise rotation and the torque in anticlockwise rotation be different from each other. One of the clockwise-side holding face 15a and the anticlockwise-side holding face 15b is a circular arc face, and the other is an inclined face. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing suitable for use in a sliding door.

  In a slide door of an automobile, a roller that supports the slide door and travels along the support track surface of the guide rail is required, and a rolling bearing is used for this roller. (Patent Document 1).

In the rolling bearing, the clockwise side holding surface and the counterclockwise side holding surface of the pocket of the cage are formed symmetrically (both are arcuate surfaces) so as to have the same torque for clockwise rotation and counterclockwise rotation. ing.
JP-A-8-175183

  In a sliding door of an automobile, it is desired to reduce the bearing torque so that the door can be opened with a light force. However, if the bearing torque is made smaller than necessary, the resistance when closing the door is too small, causing problems such as the door moving rapidly and the fingers being easily pinched.

  An object of the present invention is to provide a rolling bearing capable of opening a door with a light force when used for a sliding door of an automobile and preventing the resistance when closing the door from becoming too small. There is to do.

  A rolling bearing according to the present invention is a rolling bearing comprising an outer ring, an inner ring, a rolling element disposed between the two rings, and a cage having a plurality of pockets for holding the rolling element. Thus, the clockwise holding surface and the counterclockwise holding surface of some pockets are formed in an asymmetric shape so that the torques are different.

  The asymmetric pockets are not all and are not provided at regular intervals. For example, when there are eight pockets, continuous pockets of about 2 to 4 are formed in an asymmetric shape.

  In order to make the clockwise holding surface and the counterclockwise holding surface asymmetric, for example, one may be an arc surface and the other an inclined surface. The arc surface has a normal shape, and when the rolling element hits the arc surface, the force in the pitch circle direction of the rolling element acts on the pocket. The inclined surface is a surface inclined with respect to the radial direction, and may be inclined clockwise or counterclockwise with respect to the radial direction. The force acting on the inclined surface when the rolling element revolves and moves to the inclined surface side has not only the pitch circular direction component of the rolling element but also the radial component. The entire cage is misaligned. Therefore, a frictional force is generated between the cage and the race (outer ring or inner ring), and the bearing torque increases. The inclined surface does not need to be flat, and may have a convex arc shape in the rolling element direction or a concave arc shape so as to have a radial force component.

  The rolling element may be a ball or a cylindrical roller.

  The rolling bearing according to the present invention is suitable for use in a roller for supporting a sliding door of an automobile, but the application is not limited to this, and the rolling bearing is used in a sliding device other than the door and various other rotating parts. can do.

  According to the rolling bearing of the present invention, the clockwise holding surface and the counterclockwise holding surface of some pockets are formed in an asymmetric shape so that the torque is different between clockwise rotation and counterclockwise rotation. Therefore, when used for a sliding door of an automobile, the door can be opened with a light force, and resistance when closing the door can be prevented from becoming too small.

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

  FIG. 1 shows a slide door support device in which the rolling bearing of the present invention is preferably used. In the figure, a bracket (2) is pivotally attached to an arm (1) fixed to a sliding door, and two guide rollers (a predetermined distance in the front-rear direction) are attached to the bracket (2). 3) A support roller (5) located between (4) and the two guide rollers (3) (4) is mounted. The support roller (5) is supported by the bottom surface of the rail (6) to support the weight of the sliding door, and the resistance force when the support roller (5) rotates is large in terms of lightness and weight when the door is opened and closed. It has an influence.

  As shown in FIG. 2, the support roller (5) holds an outer ring (11), an inner ring (12), a ball (13) disposed between both wheels (11) and (12), and a ball (13). A rolling bearing having a crown-shaped cage (14) having a plurality of pockets (15) (16) is used, and the inner ring (12) is fixed to the shaft (5a) fixed to the bracket (2). As the outer ring (11) rotates, the sliding door can be smoothly opened and closed.

  In a rolling bearing, the holding surfaces of all pockets of the cage are usually the same shape, and are formed to have the same resistance (rotational torque) when rotated clockwise and when rotated counterclockwise. However, the rolling bearing retainer (14) used as the support roller (5) has three pockets (15) among the pockets (15) and (16). ) Clockwise holding surface (15a) and counterclockwise holding surface (15b) are formed asymmetrically with respect to the radial surface passing through the center of the ball (13). As a result, the direction of the force received by the cage (14) when the ball (13) revolves clockwise and the direction of the force received by the cage (14) when the ball (13) revolves counterclockwise. Has been made different.

  FIG. 3 is an enlarged view of the asymmetric holding surface pocket (15). As shown in FIG. 3 (a), the clockwise holding surface (15a) of the pocket (15) holds the ball (13). The counterclockwise holding surface (15b) has a circular arc surface (normal shape), and the distance between the radially outer edge and the ball (13) is smaller than the distance between the radially inner edge and the ball (13). It is an inclined surface. When the ball (13) moves relatively counterclockwise and a force acts between the ball (13) and the inclined counterclockwise holding surface (15b), the counterclockwise side As shown in FIG. 5B, a force perpendicular to the inclined surface acts on the holding surface (15b), and as a result, the counterclockwise holding surface (15b) is moved radially outward. On the opposite side (pocket (16) spaced 180 ° apart), the clockwise holding surface (16a) and the counterclockwise holding surface (16b) are both arcuate surfaces. A force in the tangential direction of the pitch circle acts on the surface (16b), and no force is generated to move the entire cage (14) in the radial direction. Accordingly, the sum of the radially outward forces acting on the three asymmetric holding surface pockets (15) acts as a radial force on the cage (14), and the cage (14 ) The whole moves upward (eccentric), and a large frictional force is generated between the cage (14) and the outer ring (11). This increases the rotational torque of the bearing. On the contrary, when the ball (13) moves relatively clockwise, such a large torque is not generated, and therefore the magnitude of the torque differs between the clockwise direction and the counterclockwise direction. Therefore, when this rolling bearing is used for a sliding door, the door is lightened without increasing the number of parts by changing the direction in which the bearing torque is large to the direction in which the door closes and the opposite direction to the direction in which the door opens. It can be opened with force, and the resistance when closing the door can be prevented from becoming too small.

  FIG. 4 shows a different embodiment of the rolling bearing according to the present invention, and the same effect can be obtained by replacing the asymmetric holding surface pocket (15) of the above embodiment. As shown in FIG. In addition, the clockwise holding surface (25a) of the pocket (25) is an arcuate surface (normal shape) that holds the ball (13), and the counterclockwise holding surface (25b) is the radially outer edge thereof. The distance between the portion and the ball (13) is an inclined surface that is greater than the distance between the radially inner edge and the ball (13). When the ball (13) moves relatively counterclockwise and a force acts between the ball (13) and the inclined counterclockwise holding surface (25b), the counterclockwise side As shown in FIG. 4B, a force orthogonal to the inclined surface acts on the holding surface (25b), and as a result, the counterclockwise holding surface (25b) is moved radially inward. On the opposite side (pocket (16) spaced 180 ° apart), the clockwise holding surface (16a) and the counterclockwise holding surface (16b) are both arcuate surfaces. A force in the tangential direction of the pitch circle acts on the surface (16b), and no force is generated to move the entire cage (14) in the radial direction. Accordingly, the sum of the radially outward forces acting on the three asymmetric holding surface pockets (25) acts as a radial force on the cage (14), and the cage (14 ) The whole moves downward (eccentric), and a large frictional force is generated between the cage (14) and the inner ring (12). This increases the rotational torque of the bearing. On the contrary, when the ball (13) moves relatively clockwise, such a large torque is not generated, and therefore the magnitude of the torque differs between the clockwise direction and the counterclockwise direction. Therefore, when this rolling bearing is used for a sliding door, the door is lightened without increasing the number of parts by changing the direction in which the bearing torque is large to the direction in which the door closes and the opposite direction to the direction in which the door opens. It can be opened with force, and the resistance when closing the door can be prevented from becoming too small.

  In the above embodiment, there are eight pockets, and three of them are asymmetric. However, the total number of pockets and the number of asymmetric pockets can be changed as appropriate. Moreover, the same effect can be obtained even if the balls are cylindrical rollers.

FIG. 1 is a side view showing a part of a sliding door which is an example of a use example of a rolling bearing according to the present invention. FIG. 2 is a cross-sectional view showing an embodiment of a rolling bearing according to the present invention. FIG. 3 is an enlarged cross-sectional view of the main part of FIG. FIG. 4 is an enlarged cross-sectional view of a main part showing another embodiment of the rolling bearing according to the present invention.

Explanation of symbols

(11) Outer ring
(12) Inner ring
(13) Ball (rolling element)
(14) Cage
(15) (16) Pocket
(15a) Clockwise holding surface
(15b) Counterclockwise holding surface
(25) Pocket
(25a) Clockwise holding surface
(25b) Counterclockwise holding surface

Claims (2)

  In a rolling bearing provided with an outer ring, an inner ring, a rolling element disposed between both wheels, and a cage having a plurality of pockets for holding the rolling element, the torque is different between clockwise rotation and counterclockwise rotation. A rolling bearing characterized in that a clockwise holding surface and a counterclockwise holding surface of some pockets are formed in an asymmetric shape.   2. The rolling bearing according to claim 1, wherein one of the clockwise holding surface and the counterclockwise holding surface is an arc surface and the other is an inclined surface.

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