JPS628421Y2 - - Google Patents

Description

[Detailed description of the invention] This invention was created in order to construct a guide without impairing the characteristics of the ball bush as an axial motion bearing.

That is, a ball bush is fitted and assembled into a housing with a square cross section, a bracket is attached to each of the opposing sides of the housing, and a shaft rod with a needle bearing attached to this bracket is placed at an eccentric position of the collar. The collar is rotatably mounted by inserting it through the collar, and a thread groove is cut into the shaft rod that protrudes from the collar, and a nut is screwed into it.
A roller is rotatably attached to this needle bearing, and the rollers face each other in parallel.The vertical shaft inserted into the ball bushing has both sides cut parallel to the axial direction to form a flat surface, and the above-mentioned roller is placed on this flat surface. This is used as a guide for the ball bushing.

Therefore, in the case of the above invention, since the structure of the ball bushing can be moved in the vertical axis direction without any modification, the characteristics as a ball bushing can be maintained.

In addition, the guide is formed with flat surfaces on both sides parallel to the axial direction of the vertical shaft, and rollers are in contact with these surfaces, so there is no risk of applying extra load to the entire bearing during axial movement. It can be used as a guide for a ball bushing with extremely high performance.

Also, when installing the roller, the ball bushing is fitted into the housing with a square cross section.
A pair of rollers are placed on both end faces of the housing, making it easy to install them in parallel and facing each other, which is useful for manufacturing purposes.Also, the contact between the rollers and the flat surface of the vertical shaft is maintained through needle bearings. Since the attached shaft rod is inserted through the eccentric position of the collar, the shaft rod moves eccentrically as the collar rotates, creating a highly accurate guide that can finely adjust the contact between the roller and the vertical shaft flat surface. It is possible. Further, the operation of tightening the collar is simple because the bracket can be tightened by moving a nut which is inserted through the end face of the needle bearing and the collar and is screwed into the screw groove of the shaft rod.

Conventionally, as a guide for an axial motion bearing constructed for the purpose of this invention, ball groups of the same number as the number of ball orbits of a ball bushing are formed on a vertical axis, and the balls of the ball bushing are meshed with the groups. , the vertical shaft is formed into a Skoya shape, and a bearing with a downward U-shaped cross section is covered on this vertical shaft,
There are rollers on the top surface of the vertical shaft, balls on both sides, and balls meshed with ball groups formed on the vertical shaft, but all of these are subject to moment loads or damage to the assembly part. The structure is such that a concentrated load is likely to act on the edge of the raceway due to misalignment, etc., which is a major cause of short life.

However, this invention is a practical one that overcomes the above-mentioned drawbacks and can be used as a ball bushing guide with a long life.

Embodiment (1) A ready-made ball bushing 1 in which circulation paths 1' for balls B are configured in parallel in a plurality of axial directions and balls B roll endlessly is fitted into a housing 2 having a rectangular cross-section and the same length. combination, housing 2
A pair of brackets 3 are provided on opposite sides of both end faces of the bracket. This bracket 3 is integrally formed with a washer that fits the end face of the housing 2.
Each bracket 3 is rotatably equipped with a collar 5, which has a shaft rod 4 fitted with a needle bearing N inserted through the eccentric position of the collar 5, and the shaft rod 4 protruding from the collar 5 has a threaded groove. Screw together nut 6 and attach needle bearing N end and nut 6.
The structure is such that the bracket 3 is tightened.

In this case, a washer may be installed between the needle bearing N and the bracket 3.

A roller R is rotatably attached to the needle bearing N, and the roller R is provided on both end surfaces of the housing 2 so as to face each other in parallel.

A vertical shaft 7 inserted into the ball bushing 1 has a flat surface F formed by cutting both sides parallel to the axial direction, and the roller R contacts this flat surface F to form a guide for the ball bush.

In the above embodiment, the contact pressure between the vertical shaft and the roller is adjusted by moving the shaft rod together with the roller by rotating the collar 5 rotatably attached to the bracket 3, and adjusting it within the range of the eccentric distance of the collar. It is.

The rollers are placed in place by tightening the nut so that the bracket is held together with the needle bearing (via the washer) by the nut.

Embodiment (2) The ball bush 1 and the housing 2 of the above-mentioned first embodiment are molded with a sliding part S across both ends, and the standing part of a separately prepared downward T-shaped rail L is formed with a sliding part 5.
Insert the vertical shaft 7 and rail L into the cylinder with bolts 8.
Tighten.

Incidentally, since the method of attaching the roller R is the same as that of the first embodiment, the same reference numerals are used for the same reference numerals.

[Brief explanation of the drawing]

The accompanying drawings show embodiments of this invention; FIG. 1 is a partially cutaway front view of the first embodiment, FIG. 2 is a partially cutaway end view of the same, and FIG. 3 is a front view of the second embodiment. 4
The figure is a partially cutaway end view of the same as above. In addition, the symbols in the figure, 1... ball button, 2...
Housing, 3... Bracket, 4... Shaft rod, 5
...Color, 6...Nuts, 7...Vertical axis, N...
Needle bearing, R...Roller, F...Flat surface, S...Sliding.

Claims (1)

[Claims for Utility Model Registration] 1. A ball bush 1 is fitted into a housing 2 having a rectangular cross-section, and a pair of brackets 3 are attached to each side opposite to both end surfaces of the housing. Bracket 3 has a shaft 4 to which a needle bearing N is attached, and a collar 5.
A set screw 6 is installed at an eccentric position to rotatably lock the collar 4, and is installed from the outside of the bracket.
A roller R is rotatably loosely fitted into the needle bearing N so that the rollers face each other in parallel, and a vertical shaft 7 that is inserted into the ball bushing 1 is machined on both sides parallel to the axial direction. A ball bushing guide characterized in that a flat surface F is molded and the flat surface F is brought into contact with a roller R. 2. The scope of the utility model registration claim, in which a sliding split S is applied across both ends of the housing 2 and the ball bushing 1, a rail L is inserted into the cylinder through the sliding split S, and the vertical shaft 7 is fixed with a bolt 8. A guide for the ball bushing described in item 1.