JPH0645060Y2 - Guide roller bearing - Google Patents

Description

[Detailed Description of the Invention] • Field of Industrial Application In the present invention, the roller is accurately guided by the guide protrusion at the center of the outer ring raceway surface and the stepped portion formed at the center of the punch roller. The present invention relates to a guide roller bearing suitable for use conditions such as rocking motion, impact low speed heavy load and the like.

-Prior art Conventionally, the method of holding the punch roller used for the guide roller bearing is the circumferential direction formed by the stepped portion formed in the central portion of the punch roller and the raceway surface of the inner ring. It was performed by a ring-shaped retaining ring made of thin steel plate inserted into the space.

However, since the snap ring has to be inserted into a small space and dimensioned so as not to come into contact with the raceway surface of the inner ring, the snap ring cannot have a large cross-sectional area. For this reason, the strength of the thin plate ring-shaped retaining ring cannot be sufficiently secured, and the inner ring or shaft that is deformed and comes into contact with the shaft increases the rotational torque, or the bearing assembly work is troublesome. There was a problem such as doing.

・ Problems to be solved In this way, the conventional snap ring is easily deformed due to its strength factor and is difficult to assemble, and rolling elements that arrange and hold on the raceway surface at equal intervals between the rollers. None had a cage function.

-Means for Solving Problems The present invention has the following configuration in order to solve these problems.

(1) In a guide roller bearing having a guide protrusion at the center of the inner circumference of the outer ring, a punch roller having a stepped portion formed with a diameter smaller than the roller diameter is provided at the center of the length. A guide protrusion that protrudes toward the stepped portion of the shaped roller and that restricts the movement of the punched roller in the axial direction is formed integrally with the entire circumference of the inner peripheral center of the outer ring. And a substantially ring-shaped roller holder that is inserted in a space with an inscribed circle diameter to prevent the roller from falling off, and the roller holder is made of synthetic resin and has an inner diameter slightly larger than the inscribed circle diameter. The outer diameter surface is formed to have a diameter slightly smaller than the tip of the protrusion of the guide protrusion, and the outer diameter surface has a substantially U-shaped notch for fitting with the stepped portion. The guide roller bearing is characterized in that is formed in the axial direction.

(2) The guide roller bearing according to claim 1, wherein the roller holder is cut at one location in the radial direction.

-Embodiment The drawings of FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a partial sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a projection view of a roller holder, and FIG. It is sectional drawing which shows the 2nd Example which carried out the cross section similarly.

FIG. 1 is a partial sectional view showing a first embodiment of the present invention. A raceway surface 1a is formed on the inner peripheral surface of the outer ring 1, and a guide protrusion 1b having a trapezoidal cross section for restricting the movement of the punch roller in the axial direction is formed on the entire inner periphery of the center portion of the inner peripheral surface of the outer ring 1. It is formed integrally. A plurality of oil holes 1c are formed in the guide protrusion 1b in the radial direction, and lubricating oil is supplied into the bearing by means of an oil groove 1d formed on the outer peripheral surface of the outer ring 1.

Seals 4 are attached to both axial end surfaces of the raceway surface 1a of the outer ring 1.

At the center of the punch roller 2, a stepped portion 2a having a diameter smaller than the diameter of the rolling surface and corresponding to the guide protrusion 1b is formed. The roller holder 3 is fitted in the space between the stepped portion 2a of the punch roller 2 and the inscribed circle diameter of the bearing so that the punch roller 2 does not fall off. The inner diameter of the roller holder 3 is formed slightly larger than the inscribed circle diameter of the bearing so as not to come into contact with the shaft or the inner ring.

FIG. 2 is a sectional view taken along the line AA in FIG. The roller holder 3 for preventing the punch-shaped roller 2 from coming off has an outer diameter formed in the vicinity of the center circle diameter of the roller in order to fit the stepped portion 2a of the punch-shaped roller 3,
An arcuate notch 3a is formed in the outer peripheral direction from the outer diameter surface to increase the radial thickness between the rollers to enhance rigidity.

FIG. 3 is a projection view showing only the roller holder 3 of the present invention. Under normal use conditions, the roller holder 3 may be made of a highly elastic synthetic resin so that it can be deformed and assembled, and may be formed by including a solid lubricant if necessary.

The first embodiment is an example of a full roller type in which there is almost no circumferential clearance between the rollers. In this case, since it is not necessary for the roller holder 3 to keep the clearance between the rollers constant, the outer diameter of the roller holder 3 is formed to be equal to or smaller than the central circle diameter of the roller, and the depth of the notch 3a is taken into consideration in strength. It's shallow, inexpensive, and easy to assemble.

FIG. 4 shows a second embodiment and is a sectional view similar to FIG. In this embodiment, there is a sufficient clearance between the rollers, and the roller holder 3 has a larger radial thickness than the first embodiment, and the notch 3a has a depth close to the diameter of the stepped portion. Have

With this configuration, the roller holder 3 can not only prevent the punch-shaped roller 2 from falling off, but can also regulate the arrangement pitch of the rollers in the circumferential direction, which is also effective in preventing skew.

Further, the roller holder 3 is formed with a cutting portion 3b which is divided at one location in the circumferential direction and radially, so that the roller holder 3 can be easily assembled in the bearing.

As a method for fixing the cut surface of the cut portion 3b, various techniques such as using a dovetail groove, fitting a concave or convex end surface, or the like can be introduced.

-Effects The present invention has the following effects.

That is, according to the present invention, since the guide protrusion portion that protrudes toward the stepped portion side of the punch roller and restricts the axial movement is integrally formed on the entire inner circumference of the outer ring in the central portion, It is not necessary to provide a separate member such as a stopper for restricting the movement of the punches, and a plurality of punch rollers can be easily arranged.

According to the present invention, a large number of punch-shaped rollers, which are made of a synthetic resin and have a large elasticity, are arranged along the raceway surface of the inner circumference of the outer ring in which the guide protrusion is formed in the center of the inner circumference. Since it can be folded and assembled and held at the same time, there is an effect that the assembly work of the bearing can be shortened.

Further, according to the present invention, the guide protrusion and the roller holder can prevent the roller from falling off, improve the guide performance, and reduce the skew of the bearing.

Further, according to the present invention, the inner diameter of the roller holder is formed to be slightly larger than the inscribed circle diameter, and the outer diameter surface is formed to be slightly smaller than the tip of the protrusion of the guide protrusion. As a result, the roller holder is rigid, and rotation failure after assembly does not occur.

[Brief description of drawings]

The drawings of FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a partial sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a projection view of a roller holder, and FIG. It is sectional drawing which shows the 2nd Example which carried out the cross section similarly. 1: Outer ring 1a: Raceway surface 1b: Guide protrusion 1c: Oil hole 1d: Oil groove 2: Punch roller 2a: Stepped portion 3: Roller holder 3a: Notch portion 3b: Cut portion 4: Seal

Claims (2)

[Scope of utility model registration request] 1. A guide roller bearing having a guide protrusion at the center of the inner circumference of the outer ring, wherein a punch roller having a stepped portion formed with a diameter smaller than the roller diameter is provided at the center of the length. A guide protrusion that projects toward the stepped portion of the punch roller and restricts the movement of the punch roller in the axial direction is formed integrally with the entire circumference of the center of the inner circumference of the outer ring. And a substantially ring-shaped roller holder that is inserted into the space between the roller and the inscribed circle diameter to prevent the roller from falling off, and the roller holder is made of synthetic resin and has an inner diameter slightly smaller than the inscribed circle diameter. The outer diameter surface is formed to have a diameter slightly smaller than the tip of the protrusion of the guide protrusion, and the outer diameter surface has a substantially U-shape for fitting with the stepped portion. Guide roller / bearing characterized in that the notch is formed in the axial direction . 2. The guide roller bearing according to claim 1, wherein the roller holder is cut at one location in the radial direction.