JPH0450452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to linear motion bearings, and more particularly to a device that integrates a preload device and a self-aligning device for this type of bearing.

BACKGROUND ART Conventionally, this type of bearing has had a structure as shown in, for example, Japanese Patent Publication No. 53-21058 (Japanese Patent Application No. 48-67755) as shown in FIGS. That is, the bearing body 5 has an outer surface formed of a part of a cylindrical surface, and an inner peripheral surface having the same cylindrical surface as the outer surface of the bearing main body 5, and a bearing having a taper 26 on the opposite surface to the inner peripheral surface. It had a preload alignment device in which a member 3' and an adjustment member 4' having the same taper surface as the taper 26 of the support member 3' were superimposed.

FIG. 6 shows a bearing having the configuration shown in FIG. By applying an arbitrary preload to the bearing, it is possible to increase the rigidity of the machine.

Problems to be Solved by the Invention However, the accuracy related to the machine body 19 and the workpiece 27 includes not only lateral rolling but also accuracy and load conditions related to yawing and pitching, as shown in Fig. 5. Since the structure could not meet these conditions, end loads were applied to the bearings, resulting in short lifespans, and the range of actual use was extremely limited.

Means for Solving the Problems As a means for solving the above problems, the preload alignment device of the present invention is a tapered jib (supporting member) inserted between a bed (adjusting member) and a track or a bearing body. The surface that comes into contact with one of the beds,
It is formed into a tapered shape and a cylindrical surface at the same time, and has the following configuration.

(1) Multiple raceway bodies are inserted between the linear raceway surface formed on the outer circumferential surface of the wayway and the linear raceway surface formed on the inner circumferential surface of the bearing body, and the wayway and bearing In linear motion bearings that move linearly relative to the main body, a part of a cylindrical surface is formed on the opposite track side of the track or the bearing main body, and a similar surface corresponding to the cylindrical shape is formed on one side. On the other side, a cylindrical surface whose axis is orthogonal to the cylindrical surface is formed on the tapered surface, that is, a cylinder whose axis is parallel to the tapered surface and perpendicular to the axis of the cylindrical surface (tapered cylindrical surface). A tapered jib is fitted with the track base or the bearing body, and a bed formed with a similar surface corresponding to the tapered cylindrical surface of the tapered jib is fitted with the tapered jib.

(2) Each of the cylindrical parts constituting the preload alignment device is elastically connected by a bolt attached to one via an elastic body such as an O-ring and screwed into a long hole in the other.

(3) Each cylindrical surface constituting the preload alignment device is formed of a V-shaped plane in which the concave side approximates the convex cylindrical surface.

Effects According to the present invention, the number of parts is the same as that shown in FIG. The range has been expanded by several steps, and the cross-sectional height remains the same compared to conventional products, making it easier to process, so costs will not increase.

Embodiment FIG. 1 shows a first embodiment of the present invention. In this embodiment, rollers 2 are endlessly circulated in the longitudinal direction of a track 1 having a U-shaped cross section. It is a roller bearing that moves in a straight line relative to the roller bearing. Other bearing components include a retaining plate that prevents the rollers from falling off on the raceway surface of the way, a guide plate that guides the rollers within the raceway surface, an end cap with a path for changing the direction of the rollers, and a roller. There are covers to prevent the rollers from falling off in the return path.

FIG. 2 is a perspective view of only the members of the bearing shown in FIG. 1 that are related to the preload alignment device of the present invention. A convex cylindrical surface 1b having an axis in a direction perpendicular to the direction of linear movement of the roller is formed on the lower surface of the two legs 1a of the track 1, and a concave cylindrical surface 3a corresponding to the surface is formed on the tapered jib 3. Then, perform pitching-like alignment.

The other surface of the taper jib 3 is formed with a convex cylindrical surface 3b whose axis is in the direction of linear motion of the roller, and a concave cylindrical surface 4a corresponding to that surface is formed on the bed 4 to achieve rolling alignment. At the same time, yawing-like alignment can also be performed by the two cylindrical contact parts.

Furthermore, by forming the cylindrical surfaces 4a and 3b where the bed 4 and the tapered jib 3 are in contact with each other on tapered surfaces with the same slope, and by installing a reciprocating device that moves the tapered jib 3 forward and backward relative to the bed 4, a preload is applied to the bearing. can be done.

A similar effect can be obtained even if the relationship between the concave and convex portions of each cylindrical surface is reversed.

Jetty portions 3 are provided on both sides of the concave cylindrical surface 3a of the tapered jib 3.
c is a guide for the track base to move smoothly along the arcuate surface.

3 and 4 show a second embodiment of the present invention. 1st
The basic configuration is the same as the example, but the configuration differs in the following points.

(1) In each contact surface of the preload alignment device, the convex surface is formed as a cylindrical surface, and the mating concave surface is formed as a V-shaped plane that approximates the cylindrical surface. In reality, contact between uneven cylindrical surfaces is a sophisticated processing technology, and the higher the precision, the more expensive it becomes. Therefore, in general applications, the method of contact between the convex cylindrical surface and the approximate concave V-shaped plane can provide a device that is less expensive than the first embodiment and whose performance satisfies the specifications.

(2) In the case of a type in which jetties are formed on both sides of the concave V-shaped plane of the tapered jib to guide the way, the width of the bearing increases. A device is formed that also serves as a guide device. An elongated hole is formed in the arcuate direction of the concave surface portion, a bolt that fits into the elongated hole is fixed to the convex cylindrical surface, and the elongated hole and the bolt are connected via an O-ring and a washer. As a result, the preload alignment device is not separated from the bearing, so preload and alignment can be performed smoothly, and assembly work to the machine and transportation of the bearing are easy.
Furthermore, if the washer that contacts the O-ring is made of a solid lubricant or the like, smoother movement will be achieved. Note that it is not necessary to use an O-ring as long as it is an elastic body similar to the O-ring.

As mentioned above, FIGS. 5 and 6 show conventional examples.

Although the embodiments of the present invention described above were implemented at the lower part of the track base, it is also possible to set them at the upper part of a bearing body of a bearing type as shown in the conventional example. Furthermore, it is also possible to implement this type of sliding bearing.

Effects of the invention (1) Since it has optimal self-aligning performance, there is no uneven contact between the raceway surface and the rolling elements, increasing the life of the bearing.

(2) Since it is possible to apply preload to the bearing,
Bearing stiffness increases.

(3) Alignment and preload functions in all directions can be obtained without increasing the cross-sectional height, width, or number of parts.

(4) It can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the first embodiment of the present invention;
3 is a partially cutaway front view showing a second embodiment of the present invention, and FIG. 4 is a partially cutaway side view. Further, FIGS. 5 and 6 are a partial sectional view and an overall sectional view showing a conventional example. The symbols in the drawings indicate the following members, respectively. 1...
Track base, 2...roller, 3...taper jib, 4...
...bed, 3'...support member, 4'...adjustment member,
5...Bearing body.

Claims (1)

[Claims] 1. A plurality of rolling elements are inserted between a linear raceway surface formed on the outer circumferential surface of the way and a linear raceway surface formed on the inner circumferential surface of the bearing body, In a linear motion bearing that moves a track base and a bearing body relatively linearly, a part of a cylindrical surface is formed on the opposite track side of the track base or the bearing body, and a similar shape corresponding to the cylindrical surface is formed on one side. A cylindrical surface whose axis is perpendicular to the cylindrical surface is formed on the tapered surface, that is, a cylindrical surface whose axis is parallel to the tapered surface and perpendicular to the axis of the cylindrical surface. A tapered jib formed with a cylindrical surface (cylindrical surface) is fitted with the track base or the bearing body, and a bed formed with a similar surface corresponding to the tapered cylindrical surface of the tapered jib is fitted with the tapered jib. Preload alignment device for linear motion bearings. 2. A patent characterized in that each of the cylindrical parts constituting the preload alignment device is elastically connected by a bolt attached to one via an elastic body such as an O-ring and screwed into a long hole of the other. A preload alignment device for a linear motion bearing according to claim 1. 3. The straight line according to claim 1, wherein each cylindrical surface constituting the preload alignment device is formed of a V-shaped plane whose concave side approximates the convex cylindrical surface. Preload alignment device for motion bearings.