JPH0743483Y2 - Linear bearing lubricator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear bearing lubrication device.

[0002]

2. Description of the Related Art Conventionally, as a method of supplying oil to a linear bearing, a method of forcibly filling the inside with a retainer from a ball exposure hole inside the bearing has been adopted.
Therefore, there is no device such as the present invention. As a reference, there is a ball spline lubrication device of Japanese Utility Model Publication No. 51-10278, which is different from the present invention.

[0003]

The conventional method of refueling linear bearings is extremely primitive, and each ball circulation path is refueled in a state where it is impossible to uniformly refuel all the rows. However, when this was used for the required machine tools, it was impossible to immediately refuel even if the bearing ran out of oil. Therefore, there has been a problem in that each part of the bearing is worn and rattles, which greatly affects the performance of the precision instrument.

[0004]

This invention adopts the following means in order to solve the above problems.
That is, the two ball grooves (1A) and (1B) are connected endlessly, the ball exposure hole (2) is formed in one ball groove (1A), and the ball groove (1A) and the other ball groove (1B) are formed. ) Is formed into a slope (3) having a required slope, so that the side wall of the ball groove (1B) is extended (D) to form a retainer (R) formed by forming a plurality of ball circulation paths. It is fitted to the outer cylinder (H), and the overhang (D) of the ball circulation path is pressed against the inner peripheral surface of the outer cylinder (H).
An oil chamber (F) is formed between the ball circulation path and the outer cylinder by attaching end caps (E) to both ends of the outer cylinder (H).
A ring-shaped groove (M) is engraved on the outer peripheral side of the
At the bottom of each of the oil chambers (F) in the above rows
The linear bearing (K) formed by drilling is fitted and fixed to the housing (P) having a desired shape, and the housing (P) is provided with an oil supply hole (P1) that matches the groove (M) of the outer cylinder (H). The linear bearing lubrication device is characterized in that it is provided with a nipple (N) to make it possible to uniformly lubricate the entire number of rows of the ball circulation path. Further, in the case of a machine tool in which a moment load or a high load is applied to the shaft, this problem is solved by forming a plurality of retainers in one piece.

[0005]

EXAMPLES First Example The retainer (R) of the linear bearing of this example is composed of six ball circulation paths. In the ball circulation path, two ball grooves (1A) and (1B) are connected endlessly to form a substantially elliptical plane, and one ball groove (1A) is provided for rolling the ball (B) under load. The ball exposure hole (2) is provided, and the ball (B) in the other unloaded state
Is guided to the rolling ball groove (1B), and this connecting path rolls under the load of the ball (B), and the slope (3) has a slope of about 8 ° for running up and down. It is composed of Therefore, the ball groove (1B) in which the ball (B) rolls in this unloaded state has a shape in which the side wall is bulged, and when viewed from the end face of the retainer (R), this bulge (D) circulates the ball. It is formed with 6 strips across the road, and has a flower-like shape (see Fig. 4). When it is fitted into the outer cylinder (H), this overhang (D) is pressed against the inner peripheral surface of the outer cylinder (H),
A space is formed as an oil chamber (F) by a ball circulation path corresponding to a valley and a gap between the inner peripheral surface of the outer cylinder (H) and end caps (E) attached to both ends of the outer cylinder (H). Is.

A ring-shaped groove (M) is formed on the outer peripheral surface of the outer cylinder (H), and an oil supply hole (H1) communicating with each of the oil chambers (F) is formed at the bottom of the groove. It is a thing.
The linear bearing (K) having the above configuration is fitted and mounted in the housing (P) having an appropriate outer shape, and the housing (P) is fitted to the ring-shaped groove (M) of the outer cylinder (H). An oil supply hole (P1) is formed at a position, and a nipple (N) having a structure in which a ball that closes the opening by the oil supply pressure of the grease pump presses an internal spring to open the ball is configured. Incidentally, (Z) in the figure is a collar formed on the outer cylinder (H), and is used for fixing to the housing (P).

[0007]

When oil is supplied to each oil chamber (F) of the linear bearing configured as described above from the nipple (N) by the grease pump, the oil flows from the oil supply hole (P1) to the groove (M) of the outer cylinder (P). , Each oil supply hole (H
1) It flows into the oil chamber (F), the oil chamber (F) is filled with oil, and the balls (B) of the bearing roll infinitely in the ball grooves, so that the balls are evenly guided to all rows of the ball circulation path. It is something that can be done.

Second Embodiment The principle of the linear bearing lubrication system of this embodiment is the same as that of the first embodiment. In the case of this embodiment, in order to cope with the moment load and high load of the shaft, the above first embodiment is adopted. The retainer having the same structure as that of the embodiment is integrally formed by contacting the ball circulation path of the retainer on the same axis. The outer cylinder (H) into which the retainer (R) is fitted is similar to that in the first embodiment, and since the length is different, the retainer (R) is fitted and the end caps (E) are attached to both ends. The same is true. Therefore, the length of the oil chamber (F) formed by the overhang (D) and the end cap (E) that are in pressure contact with the inner peripheral surface of the outer cylinder (H) is also different from that of the first embodiment.
However, the oil supply hole (H1) facing the oil chamber (F) is configured such that the ball circulation paths face the adjacent positions in the center of the retainer (R) and the oil is distributed to the ball circulation paths on both sides. That is, the outer peripheral groove (M) of the outer cylinder (H) is engraved at the center position of the outer cylinder (H), and this is located at the bottom of each oil chamber (F).
The oil supply hole (H1) facing the above is formed. The linear bearing (K) is a housing (P) with the required external shape.
The housing (P) is provided with an oil supply hole (P1) at a position communicating with the groove (M) of the outer cylinder (H), and a nipple (N) is attached to the oil supply hole (P1). Is. Incidentally, the reference numerals of the respective parts of the retainer (R) are the same as those in the first embodiment, so that the description of the structure will be omitted.

[0009]

This embodiment has the same function as connecting two retainers (R). Therefore, when oil is supplied from the nipple (N), oil is supplied from the oil supply hole (P1) to the groove (M) of the outer cylinder (H). ) And further flows into the respective oil chambers (F) from the oil supply holes (H1). In this case, the oil supply holes (H1) communicating with the oil chambers (F) are located at the center of both ball circulation paths. Since it fills the oil chamber, the fact that the refueling time is longer than that in the first embodiment can be alleviated by adjusting the diameter of each refueling hole. There is no such thing.

[0010]

Since the present invention is constructed as described above,
First, there is an advantage that it is possible to easily perform the lubrication work for the linear bearing, which has been difficult in the past, and to uniformly perform the lubrication on all ball circulation paths. Secondly, it is possible to prevent the oil from running out on the balls because the oil can be easily supplied, which has the advantage of extending the life of the bearing. Thirdly, since the space between the ball circulation path and the outer cylinder generated by the structure of the retainer can be used for the oil chamber (F), it is not necessary to provide an oil chamber in the special conventional linear bearing, and only the ring-shaped groove is formed in the outer cylinder. Since it is sufficient to process the oil supply hole (H1) leading to the oil chamber (F), the existing linear bearing can be used as it is. Fourthly, since the oil can be stored in the oil chamber (F), there is an advantage that the number of times of refueling can be reduced. Fifthly, there is an advantage that the waste of the oil can be prevented because the supplied oil has no risk of leaking from other than the ball exposure hole.

[Brief description of drawings]

 The attached drawings show an embodiment of this invention.

FIG. 1 is a vertical sectional side view of a first embodiment.

FIG. 2 is a transverse cross-sectional view of the main part of the same as above.

FIG. 3 is a plan view of the retainer.

FIG. 4 Same as above

FIG. 5 is a vertical sectional side view of the second embodiment.

FIG. 6 is a transverse cross-sectional view of the main part of the same as above.

FIG. 7 is a plan view of the retainer.

FIG. 8 is a transverse sectional view of the same as above.

[Explanation of symbols]

 1A Ball groove 2B Ball groove 2 Ball exposure hole 3 Slope H Outer cylinder H1 Oil supply hole M Ring groove E End cap P Housing P1 Oil supply hole N Nipple D Overhang F Oil chamber K Linear bearing

Claims (2)

[Scope of utility model registration request] 1. Two ball grooves (1A) (1B) are communicated endlessly, a ball exposure hole (2) is formed in one ball groove (1A), and the ball groove (1A) and the other ball are formed. By forming a part communicating with the groove (1B) into a slope (3) having a required slope, the side wall of the ball groove (1B) is overhanged (D) to form a plurality of ball circulation paths. R) is fitted into the outer cylinder (H), the overhang (D) of the ball circulation path is pressed against the inner peripheral surface of the outer cylinder (H), and the outer cylinder (H)
An oil chamber (F) is formed between the ball circulation path and the outer cylinder (H) by mounting end caps (E) on both ends of the outer cylinder (H), and a ring-shaped groove (M) is formed on the outer peripheral side of the outer cylinder (H). A linear bearing (K) formed by engraving a groove and forming an oil supply hole (H1) for each oil chamber (F) at the bottom of the groove (M) in the housing (P) having a desired shape. After fitting and fixing, the housing (P) has an oil supply hole (P) that matches the groove (M) of the outer cylinder (H).
1) A linear bearing lubrication device, characterized in that it is provided with a nipple (N). 2. A retainer (R) having the above-mentioned structure, wherein two ball circulation paths are closely formed integrally with each other on the same axis, and the retainer (R) is fitted to an outer cylinder (H) to form a retainer (R). The overhang (D) of R) is pressed against the inner peripheral surface of the outer cylinder (H),
An oil chamber (F) is formed between the ball circulation path and the outer cylinder (H) by an end cap (E) attached to the outer cylinder (H), and is located on the outer peripheral side of the outer cylinder (H) in the center of the retainer (R). A ring-shaped groove (M) is engraved at a position corresponding to the position, and the groove (M)
A linear bearing (K), which is a bottom portion of the oil chamber (F) and is provided with an oil supply hole (H1) for each oil chamber (F), is fitted and attached to a housing (P) having a desired outer shape, and an outer cylinder ( H)
2. The oil supply device for a linear bearing according to claim 1, wherein an oil supply hole (P1) corresponding to the groove (M) is formed, and a nipple (N) is attached to the hole.