KR20060079048A - Ball transfer and assembling method thereof - Google Patents

Abstract

The present invention discloses a ball transfer and a method of assembling the same. The present invention is mounted on a housing having an exposure slot, a tray having a spherical seating groove at one end, and a plurality of bearing balls and bearing balls arranged in the seating groove of the tray, and the body through an exposed slot of the housing. In a ball transfer having a rolling ball, the portion of which protrudes to the outside, the outer periphery of the tray is formed to a diameter smaller than the inner diameter of the housing, the edge of the outer diameter larger than the inner diameter of the housing is formed stepwise at the distal end of the assembly direction to the housing The interference fit to the housing only at the assembly end of the tray. At the distal center of the tray, a bolt is integrally formed or a screw hole is formed.

The present invention is very easy to assemble the ball transfer while the housing and the tray is able to maintain a firm fixed state.

Ball Transfer, Tray, Forced, Rim

Description

Ball transfer and assembling method             

1 is a perspective view schematically showing a general ball transfer;

2 is a cross-sectional view showing an example of a conventional ball transfer;

3 is an exploded perspective view showing a ball transfer according to the present invention;

4 is a cross-sectional view of the coupling state of FIG.

5a and 5b are cross-sectional views showing the assembly process of the ball transfer according to the present invention,

6 to 9 are cross-sectional views showing various forms of the ball transfer according to the present invention.

<Description of Symbols for Main Parts of Drawings>

11: housing 11a: exposed slot

12: tray 12a: seating groove

13: rolling ball 14: bearing ball

15: Border 16: Bolt

17: screw hole 18: flange

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball transfer used to easily transport and rotate heavy objects in any direction, and more particularly to housing a tray for supporting a rolling ball and a plurality of bearing balls. The present invention relates to a ball transfer and a method for assembling the same, which can be easily and firmly assembled and fixed in a housing.

In general, ball transfer is used to easily move or rotate a heavy object in a random direction with a small force in a production line or a large logistics system of various products. For example, in the case of a mold, since a heavy metal is used, it is very difficult to move the parts before or after machining or during assembly. As shown in FIG. 1, a plurality of ball transfers T on a bed are illustrated. By arranging appropriately, the weight W is moved very easily in a desired direction.

These ball transfers are classified into press forming type, resin forming type and cutting type according to the manufacturing method, and are divided into flange type, spring cushion type and bolt type according to their shape. . Among them, the cutting type is precise and robust, and is particularly advantageous for the movement of heavy materials.

2 shows a conventional bolted ball transfer. This is closely arranged along the spherical surface of the bearing ball 4 in the seating groove (2a) of the tray (2) consisting of a spherical surface, the rolling ball (3) on the bearing ball (4) and then the tray ( 2) is assembled to the inner circumference of the cylindrical housing (1) by interference fit method. The rolling ball 3 then supports a heavy part by partly projecting outward through the slot 1a of the housing 1.

However, such a conventional ball transfer has a problem that the assembly of both is very difficult because the entire outer circumference of the tray 2 is assembled by the inner circumference and the interference fit of the housing 1.

That is, the interference fitting method is to form the outer diameter of the shaft larger than the inner diameter of the hole to keep both of them in a fixed fixed state without a separate fixing means, the tray 2 is the outer diameter of the entire portion larger than the inner diameter of the housing 1 If it is possible, the assembly is very difficult because it must be combined with a large force from the beginning of assembly.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a ball transfer assembly method capable of easily assembling a housing and a tray of a ball transfer while maintaining a firm fixed state.

Another object of the present invention is to provide a ball transfer manufactured by the assembly method described above.

In order to achieve the above object, the ball transfer assembly method according to the present invention comprises arranging a plurality of bearing balls in a spherical seating groove formed at one end thereof, and a tray having a rolling ball mounted thereon assembled in the inner circumference of the cylindrical housing. To

Only the outer part of the tray is formed with an outer diameter larger than the inner diameter of the housing and only a portion of the distal end of the coupling direction with respect to the housing, and the remaining part is smaller than the inner diameter of the housing so that only a portion of the tray enters the housing, Characterized in that the interference fit is made.

In addition, the ball transfer according to the present invention is mounted on a housing having an exposure slot, a tray having a spherical seating groove at one end, and a plurality of bearing balls and bearing balls arranged in the seating groove of the tray. In the ball transfer having a rolling ball protruding out of the body portion through an exposure slot of the housing,

The outer periphery of the tray is formed to a diameter smaller than the inner diameter of the housing, characterized in that the edge of the outer diameter larger than the inner diameter of the housing is formed stepped in the distal end of the assembly direction with respect to the housing.

According to one preferred feature of this ball transfer of the present invention, a bolt is extended or a screw hole is formed at the distal center of the tray.

According to another feature of the invention, the outer diameter of the tray is formed to a diameter smaller than the inner diameter of the housing, only a portion of the end portion of the housing is formed so that the edge of the inner diameter smaller than the outer diameter of the tray stepped.

Accordingly, the present invention, since most of the tray is easily fitted into the housing and the interference fit is made only at the rim of the entrance end portion, assembling of both is very simple and secure compared to the prior art, it is possible to maintain a firm fixed state of the ball transfer This will be effective in improving production and reducing costs.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 to 5B, the ball transfer according to the present invention includes a tray 11, a tray 12 and a rolling ball (13) mounted with a housing 11 and a rolling ball 13 to be assembled and fixed in the housing 11. 13 is interposed between a plurality of bearing balls 14 to guide the smooth rotation of the rolling ball (13).

The housing 11 has a cylindrical shape with a closed upper end, and has an exposed slot 11a at the blocked upper end to allow a part of the rolling ball 13 to protrude outward.

A spherical seating groove 12a is formed at the upper end of the tray 12, and a plurality of bearing balls 14 are closely arranged in the seating groove 12a, and then a rolling ball 13 is placed on the bearing ball 14. Lose.

On the other hand, according to the characteristics of the present invention most of the outer periphery of the tray 12 is composed of an outer diameter smaller than the inner diameter of the housing 11, the inner diameter of the housing 11 at a portion of the distal end of the assembly progress direction with respect to the housing 11 The edge 15 having an outer diameter larger than the fine gap Δs is formed to be stepped, and is assembled and fixed to the inner circumference of the housing 11 only in a part of the outer circumference of the tray 12.

At this time, the upper end of the edge 15 is preferably composed of an inclined surface 15a inclined appropriately so as to smoothly enter the inner circumference of the housing 11.

Accordingly, in the present invention, since the gap g is formed between the outer diameter of the tray 12 and the inner diameter of the housing 11, the initial assembly tray 12 is very easily inserted into the housing 11, and the Most of the rim 15 is forcibly fitted to the housing 11 only at the end of the assembly fitted to the housing 11, so that the entire outer circumference of the tray is assembled with interference fit. It can be implemented.

In particular, the upper end of the rim 15 is composed of the inclined surface 15a, so that the rim 15 is relatively easily guided to the inclined surface 15a even when the rim 15 is fitted into the housing 11 at the end of assembly. Since the inside of the tray 12 can be easily assembled to the housing 11.

On the other hand, the housing 11 and the tray 12 of the ball transfer of the present invention may be produced by a cutting process such as a lathe, the tray 12, because the tray 12 should be uniformly in close contact with the bed (not shown) tray 12 6 and 7, it is preferable that the bolt 16 is integrally formed or the screw hole 17 is formed at the terminal center of the terminal.

That is, since the tray 12 is formed in a circular shape and the edge 15 is formed stepwise on the outer circumference thereof, the tray 12 is mainly manufactured by cutting, and in this case, fine protrusions are formed at the center of the end thereof, so there is a fear that the ball transfer may not be uniform. Is fixed to a bed (not shown), which eliminates the problem of contact surface unevenness by integrally forming a bolt 16 for fastening with the bed at the distal center of the tray 12 or by forming a screw hole 17. .

8 is a cross-sectional view showing another embodiment of the present invention. As shown therein, the inner diameter of the housing 11 is larger than the outer diameter of the tray 12, and a portion of the inner diameter distal end portion of the housing 11 is shown. The edge 15 is formed to be an inner diameter smaller than the outer diameter of the tray 12, so that the outer diameter of the edge 15 and the tray 12 is coupled by interference fit.

Therefore, the housing 11 and the tray 12 may be easily coupled by being coerced in only a portion, and the cutting may be easily received, and the cutting generated by the friction at the time of accommodation may be accommodated in the remaining portion without the edge 15 of the housing. As a result, bad coupling by the cutting material does not occur.

In the above, the present invention has been described by taking a bolt type as an example, but this is merely for the purpose of illustration, the present invention is not limited to this, for example, as shown in Figure 9 having a fastening hole (18a) in the housing 11 It goes without saying that the present invention can be applied to a flange type in which the flange 18 is formed.

As described above, according to the ball transfer and the assembly method of the present invention, since most of the tray is easily fitted in the housing and the interference fit is made only at the edge of the entry end portion, the assembly of both is very simple and robust compared to the conventional one. Since the state can be maintained, there is an excellent effect that greatly contributes to the improvement of the manufacturability and cost reduction of the ball transfer.

Claims (8)

In the ball transfer by arranging a plurality of bearing balls in a spherical seating groove formed at one end and a tray on which rolling balls are placed on the cylindrical inner circumference of the housing, Only a portion of the outer end of the tray in the engagement direction with respect to the housing is formed with an outer diameter larger than the inner diameter of the housing, and the remaining part is formed smaller than the inner diameter of the housing so that a large part of the tray enters the housing and then a predetermined length portion of the entry end. Ball transfer assembly method characterized in that only interference fit is made. In the ball transfer by arranging a plurality of bearing balls in a spherical seating groove formed at one end and a tray on which rolling balls are placed on the cylindrical inner circumference of the housing, Forming an inner diameter of the housing to an inner diameter larger than the outer diameter of the tray, only a portion of the inner diameter end portion of the housing is formed smaller than the outer diameter of the tray transfer assembly, characterized in that the housing and the tray is made only in part. A body having an exposed slot, a tray having a spherical seating groove at one end thereof, assembled into the housing, a plurality of bearing balls and bearing balls arranged in the seating groove of the tray, and a part of the body through the exposed slot of the housing. In the ball transfer having a rolling ball protrudes to the outside, The outer periphery of the tray is formed with a diameter smaller than the inner diameter of the housing, the ball transfer, characterized in that the edge of the outer diameter larger than the inner diameter of the housing is formed stepped in the distal end of the assembly direction with respect to the housing. The ball transfer of claim 2, wherein a bolt extends to a distal center of the tray. 3. The ball transfer of claim 2, wherein a screw hole is formed in the distal center of the tray. The ball transfer of claim 2, wherein a flange having a plurality of fastening holes is provided in the housing. The ball transfer according to any one of claims 2 to 5, wherein the upper edge of the edge of the tray is inclined. A body having an exposed slot, a tray having a spherical seating groove at one end thereof, assembled into the housing, a plurality of bearing balls and bearing balls arranged in the seating groove of the tray, and a part of the body through the exposed slot of the housing. In the ball transfer having a rolling ball protrudes to the outside, The outer periphery of the tray is formed with a diameter smaller than the inner diameter of the housing, the ball transfer, characterized in that the edge of the inner diameter smaller than the outer diameter of the tray only a portion of the inner diameter end portion of the housing is stepped.

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