JPS62180113A - Pre-load aligning device of bearing for linear motion - Google Patents

Abstract

PURPOSE:To obviate the one-sided strike between an orbital plane and a rolling body so as to improve durability, by fitting a bed to the taper cylindrical surface of a taper gib, and automatically aligning against displacement. CONSTITUTION:Convex cylindrical surfaces 1b having axis centers are formed at the lower surfaces of the leg portions 1a of an orbital saddle 1, and a concave cylindrical surface 3a corresponding to the surfaces is formed on a taper gib 3 so as to carry out a pitching-like alignment. A convex cylindrical surface 3b is formed on the other plane of the taper gib 3, and a concave cylindrical surface 4a corresponding to this surface is formed on a bed 4. Thus, a rolling- like alignment can be carried out and a yawing-like alignment also can be carried out by the two cylindrical contact portions, so that the one-sided strike between an orbital plane and a rolling body can be obviated.

Description

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

2. Description of the Related Art Conventionally, this type of bearing is used, for example, the Japanese Patent Publication No. 5, shown in Figures 5 and 6.
It had a structure similar to that of Publication No. 3-21058 (Japanese Patent Application No. 67755/1982). In other words, a bearing body 5 whose outer surface is a part of a cylindrical surface, and an inner circumferential surface which has the same cylindrical surface as the outer surface of the bearing body 5, and a taper 26 is formed on the opposite surface to the inner circumferential surface. and an adjustment member 4' having the same tee A surface as the taper 26 of the support member 3'.
It had a preload alignment device that overlapped the two.

FIG. 6 shows a machine in which a bearing having the configuration shown in FIG. Se2
6 and the adjusting member 24, it is possible to apply an arbitrary preload to the bearing and 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 is not limited to left and right rolling, but also includes accuracy and load conditions related to yawing and pitching. Since such a configuration cannot meet these conditions, the end load is applied to the bearing, resulting in a short life, and its actual range of use is extremely limited1.

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

(1) A plurality of raceway bodies are inserted between the linear raceway surface formed on the outer circumference of the wayway and the linear raceway surface formed on the inner circumference 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, there is a cylindrical surface whose axis is perpendicular to the cylindrical surface and the cylindrical surface, that is, a cylinder whose axis is parallel to the cylindrical surface and perpendicular to the axis of the cylindrical surface. A tapered jib with a cylindrical surface formed thereon is fitted with the track base or the bearing body, and a bed with a similar surface corresponding to the cylindrical surface formed on the tip of the tapered jib is fitted with the tapered jib. That's what I'm doing.

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

(3) Each cylindrical surface constituting the preload alignment device has a V-shaped flat surface 1 in which the concave side approximates the convex cylindrical surface.

According to the present invention, the number of members is the same as that shown in FIG.
Furthermore, since the bearing can be easily preloaded,
Its range of use has been expanded by several steps, and since the cross-sectional height remains the same compared to conventional products and it is easier to process, costs will not increase.

Embodiment FIG. 1 shows a first embodiment of the present invention. In this embodiment, a row 22 is endlessly circulated in the longitudinal direction of a track l having a U-shaped cross section, and a mating member (not shown in the figure) is There is a ζ roller bearing 1 that moves linearly relative to the Other bearing components include a retainer plate that prevents the rollers on the raceway surface of the track base from falling off, 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 f 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 linear motion direction of the roller is formed on the lower surface of the two legs 1a of the track l, and a concave cylindrical surface 3a corresponding to the surface is formed on the tapered jib 3. Then, perform pitching-like alignment.

A convex cylindrical surface 3b whose axis is in the direction of linear motion of the roller is formed on the other surface of the taper jib 3, and a concave cylindrical surface 4a corresponding to the surface is formed on the propeller P4, thereby achieving rolling alignment. At the same time, the two cylindrical contact parts also allow for yawing alignment.

Roughly speaking, the cylindrical surfaces 4a + 3b where the bed 4 and the tenozo jib 3 contact are formed on tapered surfaces of the same slope, and by installing an advancing/retracting device that moves the taper jib 3 forward and backward relative to the propeller ¥4, A preload can be applied by

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

Jetty portions 3C are formed on both sides of the concave cylindrical surface 3a of the taper jib 3, and these are guides 1 for smoothly moving the track base along the arcuate surface.

3 and 4 show a second embodiment of the present invention. The basic configuration is the same as the first example, but there is one difference in the following configuration.

(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 requires advanced processing technology, and the higher the precision, the more expensive it becomes. Therefore, the general application is a convex cylindrical surface and an approximate concave V
The method of contact with the letter-shaped plane is also cheaper than the first embodiment.
We can provide products that meet the specifications in terms of performance.

(2) In the case of a type in which jetties are formed on both sides of the concave V-shaped plane of the jib to guide the way, the width of the bearing increases. A device is formed inside that serves as a separation prevention device and a guide device.

An elongated hole is formed in the arcuate direction of the concave surface portion, a bolt that fits into the hole is fixed to the convex cylindrical surface, and the elongated hole and the dart are connected via an O-ring and a washer. As a result, the preload alignment device is not separated from the bearing, allowing smooth preload and alignment, making it easy to assemble to the machine and transport the bearing.

Furthermore, if the washer that contacts the O-ring is coated with a solid lubricant, 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 a conventional example.

Although the above-described embodiments of the present invention were implemented at the bottom of the track, it is also possible to set them at the top of a four-ring main body of a bearing type as shown in the conventional example.

Furthermore, it is also possible to implement this type of sliding bearing1.
be.

Effects of the invention (1) Since the bearing 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 a preload can be applied to the bearing, the rigidity of the bearing increases.

(3) Alignment action and preload function in all directions can be obtained without increasing the height of the cross section, the width dimension, or the number of parts.

(4) It can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a first embodiment of the present invention, Fig. 2 is an enlarged perspective view of the main parts, Fig. 3 is a partially cutaway front view showing a second embodiment of the invention, and Fig. 4 is the same. Front cutaway view-r!
be. Further, FIG. 5.6 is 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: Thenozo jib 4: 4-piece 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 peripheral surface of the way and a linear raceway surface formed on the inner peripheral 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 part of a cylindrical surface is formed on one side corresponding to the cylindrical surface. A similar surface is formed, and the other side is a cylindrical surface whose axis is perpendicular to the cylindrical surface and 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 tapered 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. Features a preload alignment device for linear motion bearings. 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 of the other. A preload alignment device for a linear motion bearing according to claim 1. 3. 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 linear motion bearings.