JPS6136811Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a linear rotation bearing device comprising an outer ring, a cage with balls for linear rotation, and a guide shaft.

First, as shown in Fig. 1, a conventional linear motion rotation bearing device consists of an outer ring 1 having an insertion hole into which a guide shaft can be inserted, and a cage 2 with balls for linear motion rotation, and a separately prepared guide shaft. It is used by mating. At the time of this fitting, adjustment must be made so that the linearly rotating ball-equipped retainer 2 is at approximately the center position (specified position) of the outer ring 1. This adjustment is performed as follows. First, after attaching the outer ring 1 to the housing, the guide shaft is attached to the outer ring 1.
Gently insert it into the insertion hole. The above-mentioned cage 2 with balls for linear motion rotation moves as the guide shaft is inserted,
It abuts against the inner end surface of the outer ring 1 opposite to the insertion side of the guide shaft and stops. After that, push the guide shaft further until it reaches almost the specified position, then push it further until it reaches approximately 1/2 of the maximum stroke of the bearing device. Next, by returning the guide shaft to the specified position, the cage 2 with balls for linear motion rotation is placed at approximately the center of the outer ring 1 (the specified position).
shall be. This adjustment is actually very difficult and troublesome. Furthermore, in the above conventional example, the cage 2 with balls for linear motion rotation often deviates from the specified position (approximately the center position of the outer ring) due to the axial movement of the guide shaft, and each time, There was a drawback that the above adjustment had to be repeated. Another disadvantage is that it cannot bear the load in the axial direction along the guide shaft due to its structure.

The present invention provides a novel linear rotary bearing device that eliminates all of the above drawbacks.

FIG. 2 is a diagram showing an embodiment of the present invention. In this figure, the same symbols as in FIG. 1 indicate the same members. As shown in FIGS. 2A and 2B, the linear rotating bearing device of the present invention has one end of the spring 4 connected to the thrust rotary plate 5, and the other end connected to a predetermined location of the guide shaft 3. In addition, thrust ball rolling grooves 1a and 5a are formed on the end face of the outer ring 1 and the thrust rotary plate 5, respectively, forming a thrust bearing structure. An axial load is constantly applied to the outer ring 1 through the bearing 1, and the entire bearing device is integrated, and the linearly rotating ball retainer 2 is held at a prescribed position as shown in FIG. 2A. or,
7 is a shield plate that prevents the cage 2 with balls for linear motion rotation from overrunning and falling off. Since the present invention has such a structure, under normal conditions, the cage 2 with balls for linear motion rotation is always held at the specified position as shown in FIG. There will be no deviation. In addition, when the guide shaft 3 is operated by receiving an external force F due to magnetic excitation or cam drive by a mechanism on the driving side connected to the tip of the guide shaft 3, the guide shaft 3
is the thrust rotating plate 5 via the thrust ball 6.
While rotating at the same time, it is possible to reciprocate in the axial direction from the position of the ball-equipped retainer 2 for linear motion rotation in the axial direction from the position of FIG. 2A to the position of FIG. 2B. Note that the same effect can be obtained even if an elastic body other than the spring 4 is used. It is also possible to integrate the entire bearing device by devising a mounting method such as using a magnet or using it vertically.

As described above, the present invention disposes the thrust balls 6 between the end face of the outer ring 1 formed with the thrust ball rolling grooves 1a and 5a and the thrust rotary plate 5, and ball 6
One end of an elastic body such as a spring 4 that constantly applies an axial load to the outer ring 1 through the thrust rotating plate 5 is locked to the thrust rotating plate 5, and the other end is locked to a predetermined position of the guide shaft 3. This linear rotation bearing device is characterized in that the cage 2 with balls for linear rotation rotation is held at a prescribed position.
Since the present invention has such features, the cage 2 with balls for linear motion rotation can be held at a specified position in a normal state. Further, when the guide shaft 3 is activated by receiving an external force, the guide shaft 3 can reciprocate in the axial direction while rotating together with the thrust rotary plate 5 via the thrust balls 6.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional direct-acting rotary bearing device, and FIG. 2 is a diagram showing an embodiment of the present invention. 1... Outer ring, 1a... Thrust ball rolling groove,
2... Cage with ball for direct rotation, 3... Guide shaft, 4... Spring, 5... Thrust rotating plate,
5a... Thrust ball rolling groove, 6... Thrust ball, 7... Shield plate.

Claims (1)

[Scope of utility model registration request] A thrust ball is disposed between the end face of the outer ring formed with thrust ball rolling grooves and a thrust rotating plate, and the elasticity is such that an axial load is constantly applied to the outer ring via the thrust rotating plate and the thrust ball. One end of the body is locked to the thrust rotary plate and the other end is locked to a predetermined position on the guide shaft, so that the cage with balls for linear motion rotation is held at a specified position. A direct-acting rotary bearing device.