JPH07317764A - Spline device - Google Patents

Abstract

PURPOSE:To make compact a spline device by turning an external rotary cylinder in relation to a slide cylinder by means of the turning of a rolling element and sliding the slide cylinder by means of the rolling of the balls in a ball endless orbit in relation to a CONSTITUTION:A load ball groove 2' is formed in the internal face of a slide cylinder 1, a ball cage 3 is provided in the slide cylinder 1. A non-load ball orbit 4 is formed by this ball cage 3 to be made the external periphery of the shaft 7 to be inserted into the slide cylinder 1, and a ball rolling groove 8 is formed at a position corresponding to the load ball groove 2. A ball endless orbit 5 is formed by the load ball groove 2, the non load ball orbit 4 and the ball rolling groove 8. A ball 6 is arranged in this ball endless orbit 5 and a slide section 9 is provided. On the other hand, a rolling element cage 10 is provided kin an external turning cylinder 12, and a load rolling element fitting section 14 is formed by this rolling element cage 10, and a rolling element 11 is arranged, and a turning section 22 is provided. The rolling element 11 of the turning section 22 is supported by the internal face of the external turning cylinder 12 and the external face of the slide cylinder 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding and rotating spline device.

[0002]

2. Description of the Related Art Conventionally, a so-called bush in which a shaft and a sliding cylinder fitted on the shaft rotate relatively, and a sliding cylinder fitted on the shaft and the shaft. A so-called spline that does not relatively rotate is proposed.

By the way, the applicant of the present invention has proposed Japanese Patent Application No. 1-218312 in which a rotating bearing is fitted on a bush.

The present invention is an improved invention of Japanese Patent Application No. 1-218312, in which a rotary bearing is fitted on a spline. In addition, in order to improve the practicality, the present invention is further equipped with an additional mechanism.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

A load ball groove 2 is formed on the inner surface of the sliding cylinder 1, a ball cage 3 is provided in the sliding cylinder 1, and an unloaded ball track 4 is formed by the ball cage 3 to form the sliding cylinder 1. A ball rolling groove 8 is formed at a position corresponding to the load ball groove 2 on the outer circumference of the shaft 7 inserted therein.
A ball endless track 5 is formed by the unloaded ball track 4 and the ball rolling groove 8, and a ball 6 is arranged on the ball endless track 5 to provide a slide portion 9, while in the rotating outer cylinder 12. A rolling element holder (10) is provided, and a load rolling element fitting portion (14) is formed by this rolling element holder (10).
11 is provided to provide a rotating portion 22, and the rotating portion 22 is fitted into the slide portion 9 so as not to come off, and the rolling element 11 of the rotating portion 22 is attached to the inner surface of the rotating outer cylinder 12. The present invention relates to a spline device characterized by being supported by the outer surface of the sliding cylinder 1.

A load ball groove 2 is formed on the inner surface of the sliding cylinder 1,
A ball retainer 3 is provided in the sliding cylinder 1, and an unloaded ball track 4 is formed by the ball retainer 3 and the load ball groove 2 is formed on the outer circumference of the shaft 7 inserted in the sliding cylinder 1. A ball rolling groove 8 is formed at a corresponding position, and a ball endless track 5 is formed by the loaded ball groove 2, the unloaded ball track 4 and the ball rolling groove 8, and a ball 6 is arranged on the ball endless track 5. Then, the sliding member 1 is provided with the ring member 13 which is fitted on the shaft 7 and abuts and slides on the shaft 7, and the slide portion 9 is provided. This rolling element holder 10
To form the load rolling element fitting portion 14, the load rolling element fitting portion 14 is provided with the rolling element 11, and the turning portion 22 is provided, and the turning portion 22 is pulled out from the slide portion 9. The rolling element 11 of the rotating portion 22 is fitted in the stopped state, and the inner surface of the rotating outer cylinder 12 and the sliding cylinder 1
The spline device is characterized in that it is supported by the outer surface of the spline device.

[0008]

The rotating outer cylinder 12 is rotated with respect to the sliding cylinder 1 by the rotation of the rolling element 11, and the sliding cylinder 1 (the rotating outer cylinder is rotated by the rolling of the ball 6 in the ball endless track 5). 12) slides on the shaft 7.

Further, since the ring member 13 is present, the rigidity becomes higher accordingly.

[0010]

1, 2 and 3 show a first embodiment of the present invention, and FIG. 4 shows a second embodiment, which will be described below.

First, the slide portion 9 will be described. Two load ball grooves 2 are formed on the top and bottom of the inner surface of the sliding cylinder 1, and a ball cage 3 having return parts at both ends is provided inside the sliding cylinder 1. Two unloaded ball tracks 4 are formed at each position. A ball rolling groove 8 is formed on the outer periphery of the shaft 7 inserted into the sliding cylinder 1 at a position corresponding to the load ball groove 2. Therefore, four ball endless tracks 5 formed by the loaded ball groove 2, the unloaded ball track 4, and the ball rolling groove 8 are formed on the inner surface of the sliding cylinder 1. Reference numeral 24 is a collar portion.

Next, the rotating portion 22 will be described. A rotating outer cylinder (12) having a cylindrical rolling element retainer (10) having a plurality of load rolling element fitting sections (holes) formed at regular intervals is provided on the inner surface. A collar portion 15 is provided on the rotating outer cylinder 12 in a line. In the drawing, the rotating unit 22 uses balls as the rolling elements 11, but the same applies when rollers (cross rollers) are used instead of the balls 11. Incidentally, reference numeral 23 is a ball which receives a load in the sliding direction, and unlike the ball 11, it is arranged in an annular shape so that the adjacent balls 23 are in contact with each other.

This rotating cylinder is attached to the sliding cylinder 1 of the slide portion 9.
The rotating outer cylinder 12 of 22 is fitted, the ball 6 is arranged on the ball endless track 5, the rolling element 11 is arranged on the load rolling element fitting portion 14, and the outer peripheral surface of the sliding cylinder 1 is The rolling outer cylinder (12) and the inner peripheral surface of the rotating outer cylinder (12) receive the rolling element (11).

In the figure, reference numeral 16 is a retaining hole, 17 and 21 are fixing holes,
18 is a ball contact member, 19 is a fastening ring, and 20 is a rubber ring.

Since this embodiment is constructed as described above, if the shaft 7 is rotated by an appropriate means, the sliding cylinder 1 is rotated by the rotating outer cylinder 12.
In addition, the sliding cylinder 1 and the rotating outer cylinder 12 are slidable with respect to the shaft 7. Further, since the ball track 5 is housed inside the sliding cylinder 1, the device can be made compact.

FIG. 4 is a sectional view of the second embodiment, in which the ring member 13 is added to the first embodiment.
That is, inside the sliding cylinder 1, ring members 13 fitted on the shaft 7 and abuttingly sliding on the shaft 7 are provided at both ends of the ball cage 3. The ring member 13 uses, for example, a so-called oil wrestling bearing impregnated with oil.

This embodiment exhibits the following effects in addition to the effects of the first embodiment described above.

That is, so-called rolling bearings using balls have various advantages such as light movement, but have drawbacks such as low rigidity and weak impact. For example,
When each part incorporating the rolling bearing moves at high speed, so-called cracking (vibration) occurs in each part.

In this embodiment, since the ring members 13 are provided on both sides of the ball retainer 3, the action of the plain bearing is exhibited in addition to the action of the rolling bearing. Specifically, the rigidity in the pitching direction and the radial direction is improved. Therefore, the present embodiment exhibits both the advantages of the rolling bearing and the advantages of the plain bearing.

If the ring member 13 is made of a split ring body or the like so that its diameter can be changed, the ring member 13 can be brought into contact with the shaft 7 at any time, and therefore, depending on the use condition. Only the rolling bearing can be appropriately selected, and the rolling bearing and the plain bearing can be used together. The adoption of the ring member 13 having a variable diameter means that the sliding resistance of the sliding cylinder 1 in the traveling direction can be arbitrarily set. Therefore, in this embodiment, the sliding cylinder 1 has a sliding condition adjusting function. It can be said that the device has been added.

[0021]

Since the present invention is constructed as described above, the spline device achieves the compactness of the device and exhibits the advantages of both rolling bearings and plain bearings.

[Brief description of drawings]

FIG. 1 is a front sectional view of the present embodiment.

FIG. 2 is a side sectional view of the above.

FIG. 3 is a cross-sectional view of a main part of the above.

FIG. 4 is a front sectional view of another example.

[Explanation of symbols]

 1 Sliding Cylinder 2 Loaded Ball Groove 3 Ball Cage 4 Unloaded Ball Track 5 Ball Endless Track 6 Ball 7 Axis 8 Ball Rolling Groove 9 Slide Section 10 Rolling Body Cage 11 Rolling Body 12 Rotating Outer Cylinder 13 Ring Member 14 Load rolling element fitting part 22 Rotating part

Claims (2)

[Claims] 1. A load ball groove is formed on the inner surface of the sliding cylinder,
A ball cage is provided in the sliding cylinder, and an unloaded ball track is formed by this ball cage, and the ball rolling groove is formed at the position corresponding to the loaded ball groove on the outer circumference of the shaft inserted in the sliding cylinder. And the loaded ball groove, the unloaded ball raceway, and the ball rolling groove form a ball endless track, and the ball is arranged on this ball endless track to provide a slide portion, while the inside of the rotating outer cylinder is provided. A rolling element holder is provided, a load rolling element fitting portion is formed by the rolling element holder, a rolling element is provided in the load rolling element fitting portion, and a turning portion is provided. A spline device, wherein the spline device is fitted to the slide portion in a retaining state, and the rolling element of the rotating portion is supported by the inner surface of the rotating outer cylinder and the outer surface of the sliding cylinder. 2. A load ball groove is formed on the inner surface of the sliding cylinder, a ball retainer is provided in the sliding cylinder, and an unloaded ball track is formed by the ball retainer, which is inserted into the sliding cylinder. A ball rolling groove is formed on the outer periphery of the shaft at a position corresponding to the load ball groove, and a ball endless track is formed by the load ball groove, the unloaded ball raceway, and the ball rolling groove. Is provided, and a slide member is provided by providing a ring member that is fitted on the shaft in the sliding cylinder and abuts and slides on the shaft.
On the other hand, a rolling element holder is provided in the rotating outer cylinder, a load rolling element fitting portion is formed by this rolling element holder, and a rolling element is arranged in the load rolling element fitting portion to form the turning portion. It is characterized in that the rotating portion is fitted into the slide portion in a retaining state, and the rolling element of the rotating portion is supported by the inner surface of the rotating outer cylinder and the outer surface of the sliding cylinder. Spline device.