JPS58160622A - Bearing mechanism - Google Patents

Abstract

PURPOSE:To obtain a bearing mechanism that allows bearing to roll only in the axial direction by using a bearing which forms spherical parts of a large diameter at its both ends and is restricted to roll in the rotational direction of a shaft. CONSTITUTION:The internal surface of a bearing part 1 is provided with a recession 1a along its almost entire length, and a bearing case 3 is fitted in the recession 1a. In each bearing case 3, a bearing 4 that looks like an iron dumbbell is shaft-supported in a freely rotational manner at an equal interval along the shaft direction. Both ends of the bearing 4 are formed in spherical rotating bodies 4a and 4a of a large diameter, and shaft pins 5 and 5 that project from the rotating bodies 4a and 4a are supported by the bearing case 3. As a result, the bearing 4 is allowed to rotate freely only in the axial direction of shaft S and not to move along the rotational direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing mechanism for a shaft that moves only in the axial direction, such as a ram of a hydraulic cylinder or an arm of a robot.

Conventionally, this type of bearing mechanism uses a ball bearing to support the bearing, but since this ball bearing rolls not only in the axial direction but also in any rotational direction, the movement of the shaft in the rotational direction is restrained. If necessary, it was necessary to separately provide special means for this prevention.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing mechanism in which a bearing prevents movement in the rotational direction of a shaft and allows the bearing to roll only in the axial direction.

The structure of the present invention is characterized by the use of a bearing having a large diameter spherical portion at both ends, such as an iron array type bearing.

Embodiments of the present invention will be described below based on the drawings.

In Fig. 1.2, a shaft insertion hole 2 is provided at the center of a bearing portion l, which is a bearing pipe. A recess 1a is formed in the inner wall surface of the hole of the bearing l over the entire length of the bearing l, and a bearing case 3 is fitted into this recess. There are several locations.

Each bearing case 3 has an iron array-shaped bearing 4. ... are rotatably supported at equal intervals in the axial direction. That is, the bearing 4 has large spherical rotating bodies 4g and 4a formed at both ends thereof, and shaft pins 5.5 projecting from each outer end of the rotating bodies are supported by the bearing case 3. Therefore, the bearing 4 can be moved only in the axial direction of the shaft S, but cannot be moved in the rotational direction. The outer periphery of the shaft S comes into contact with the rotating bodies 4a and 4m of the bearing 4, thereby holding the shaft S. Also, the bearing part 1
Insert the set screw 6 from the A circumferential surface into the bearing case 3.
I'm running into this. The bearing 4 is moved in and out by the set screw 6.
can adjust the force of contact with the shaft S. 7 is a cap screw that supports the bearing case 3 to the bearing part 1, and 7aij is a rotation operation part of the cap screw.

In the bearing mechanism configured in this way, the shaft S is supported by the bearing 4 that rolls only in the axial direction, so the shaft moves smoothly only in the direction of the arrow in FIG. can be regulated. Further, since the contact force between the bearing 4 and the shaft S can be adjusted by moving the set screw 6 in and out, the rotation restraining force of the shaft S can also be adjusted freely.

In the embodiment of the present invention, an example is shown in which the movement of the shaft S is performed by the rolling action of the bearing 40, but as shown in FIG. Alternatively, the bearing portion 9 may be rotated in a circular motion.

As described above, according to the present invention, the bearing provided in the bearing part is structured so that it rolls only in the axial direction, thereby making it possible to reliably restrict the movement of the shaft in the rotational direction. Accurate axial movement of the shaft can be performed. Furthermore, the bearing mechanism of the present invention has the advantage that by unitizing the bearing case and the bearing, it is possible to easily change shafts with different shaft diameters simply by replacing the bearing with the bearing part.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially sectional view, FIG. 2 is a partially sectional front view, and FIG. 3 is a schematic diagram of another embodiment. l...bearing part, 2...shaft insertion hole 1.3...bearing case, 4...bearing, 4a...rotating body,
5... Shaft pin, 6... Set screw, 7... Cap screw, 8... Bearing, 9... Bearing part, S... Shaft. Patent applicant: Maruzen Co., Ltd.

Claims (1)

[Claims] (1) A bearing portion having a shaft insertion hole in the center, a bearing case provided on the inner wall surface of the bearing portion, and a spherical rotating body at both ends of the bearing case. A bearing mechanism characterized by comprising a bearing that is supported in a trap that is freely transferable only in the axial direction, and a shaft that is in contact with the bearing. (2. In claim 1, the bearing is A bearing mechanism characterized in that it has an iron array shape. (3) A bearing mechanism according to claim 1, characterized in that the bearing portion rotates in a loop shape while rotating the bearing. (4) The bearing mechanism according to claim 1, characterized in that the bearing portion is provided with a set screw for adjusting the contact force between the bearing and the shaft.