JPH0444506B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention [Field of Industrial Application] The present invention relates to a linear motion guide device for a linear motor.

[Conventional technology]

Conventionally, various linear motion guide devices for linear motors of this type have been proposed, and representative ones are shown in FIGS. 6 and 7. Figure 6 is a sectional view, Figure 7
The figure is a plan view.

In FIGS. 6 and 7, 1 is a stator of a linear motor or a linear stepping motor, and plane guide surfaces 3a to 3f for guiding linear motion are provided so as to be parallel to each other with respect to the direction of motion. It is being

Reference numeral 2 denotes a movable element, which includes pairs of roller bearings 4a, 4b, 5a, 5 that abut against the planar guide surfaces 3a to 3f.
b, 6a, 6b, 7a, 7b, 8a, 8b, 9
a and 9b are each rotatably fixed. The movable element 2 is connected to the stator 1 by each pair of roller bearings mentioned above.
It is supported vertically, horizontally, and horizontally, and is configured to allow reciprocating linear movement only in the direction of the arrow.

In addition, in a planar facing type linear motor or linear stepping motor, there is also a structure in which the roller bearings 4b, 7b, 5b, and 8b shown in FIGS. 6 and 7 are omitted by utilizing magnetic attraction force. , you still have to use eight roller bearings.

[Problem that the invention seeks to solve]

As mentioned above, the conventional linear motion guide device requires the use of a large number of expensive roller bearings, and also requires a plurality of planar guide surfaces on the stator 1 to provide high precision over the entire motion range of the mover 2. It was necessary to maintain parallelism, and maintaining this parallelism was extremely difficult. If the parallelism of the planar guide surfaces is not maintained, the mover 2 will not move linearly smoothly.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional examples and to provide a linear motion guide device that is inexpensive and easy to implement.

B. Structure of the Invention [Means for Solving Problems] The present invention provides first and second circular cross-sectional shafts disposed on both sides of the movable element parallel to the direction of movement of the movable element;
an auxiliary member elastically attached to the movable element via an elastic member; two pairs of roller bearings that abut on the first circular cross-sectional shaft; and the two pairs of roller bearings are rotatably provided on the auxiliary member so that the rotational axes are substantially perpendicular to each other in a plane perpendicular to the direction of movement of the movable element. A linear motor comprising at least one pair of roller bearings that abuts the second circular cross-sectional shaft by the elastic force of the auxiliary member in a direction opposite to the abutting direction of the pair of roller bearings. It is an exercise guide device.

[Effect]

The mover is a pair of roller bearings whose rotating axes are orthogonal in a plane perpendicular to the direction of movement of the mover, and is elastically supported by circular cross-section shafts placed on both sides of the mover. Support is ensured and smooth movement is possible even if the parallelism of the circular cross-sectional axes is slightly off.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view, and FIG. 2 is a plan view.
In FIGS. 1 and 2, the same parts as in FIGS. 6 and 7 are designated by the same reference numerals, and 10, 1
Reference numeral 1 denotes a circular cross-section shaft arranged parallel to both sides of the movable element 2, and 12a, 13a, 12b, and 13b denote a pair of roller bearings that abut the circular cross-section shaft 10 and are rotatably supported by the movable element 2. The bearing pair is arranged so that its rotational axis is substantially perpendicular to the moving direction of the movable element 2 in a plane perpendicular to the direction of movement.

Reference numerals 14 and 15 denote a pair of roller bearings rotatably supported by an auxiliary member 16 constituting a part of the movable element 2, and the pair of roller bearings are arranged at approximately right angles in a plane perpendicular to the direction of movement of the movable element 2. The roller bearing pair 12a, 1
It abuts against the circular cross-section shaft 11 at a substantially intermediate position between 3a, 12b, and 13b.

17a, 18a, 17b, 18b are auxiliary members 1
These setscrews 17a, 18a, 17b, 1 are screwed into the mover 2 through holes No. 6 (U-shaped notches formed on the side surfaces are also acceptable).
The roller bearing pairs 14, 15 are connected via the compression coil springs 19a, 20a, 19b, 20b and the auxiliary member 16, which are fitted into the set screws with a screw-in amount of 8b.
is elastically pressed against the circular cross-section shaft 11 by the compression force of the compression coil spring. Therefore, the roller bearing pairs 12a, 13a, 12b, 13b are also elastically pressed against the circular cross-section shaft 10 with the same compression force as described above.

In this embodiment configured as above,
When an electromagnetic force is applied between an armature coil (not shown) and a permanent magnet in the direction of the arrow in FIG. 2, the movable element 2 can smoothly move linearly in the direction of the electromagnetic force.

3 and 4 show an embodiment in which the present invention is applied to a voice coil type linear motor, FIG. 3 is a front view of the main part, and FIG. 4 is a cross-sectional view taken along line A-A in FIG. 3. The same parts as in FIGS. 1 and 2 are designated by the same reference numerals.

In FIGS. 3 and 4, 21a and 21b are upper and lower outer yokes that also serve as substrates, and permanent magnets 22a and 22b are fixed to their opposing surfaces by adhesive or the like. Reference numerals 23a and 23b are inner yokes made of a magnetic material supported by side plates (not shown), and are disposed between the permanent magnets 22a and 22b. 24 is an armature coil wound around the bobbin portion 2a of the movable element 2 through between the permanent magnets 22a, 22b and the inner yokes 23a, 23b;
Electromagnetic force is generated in the flat part located between the two.

The mover 2 and the auxiliary member 16 are made of light alloy or plastic, and as shown in FIG. 4, unnecessary parts are thinned out to reduce weight.

The permanent magnets 22a and 22b are magnetized in the direction of the arrow in FIG. The force is generated, and the movable element 2 can make reciprocating linear motion in the direction of the arrow in FIG.

FIG. 5 is a sectional view showing an embodiment in which the present invention is applied to a semiconductor linear motor, and the same parts as in FIGS. 3 and 4 are designated by the same reference numerals. 2
Reference numeral 5 denotes a printed wiring board constituting a part of the mover 2. On both sides facing the permanent magnets 22a and 22b, there are armature coils 26a and 26b and a Hall element, for example, for obtaining a signal for switching the armature coil current. A position detection element 27 such as the like is attached.
By energizing the armature coils 26a and 26b, the movable element 2 moves linearly in a reciprocating direction along the circular cross-sectional axes 10 and 11 in a direction perpendicular to the plane of the drawing.

In each of the above embodiments, the rotating shaft 28 that supports the roller bearing is machined with a groove (not shown), and a tightening washer or the like is fitted to support the roller bearing so that it does not fall. However, since it is not directly related to the present invention, it is omitted. Further, the circular cross-section shafts 10 and 11 may be hollow shafts such as pipes in order to reduce the weight.

C. Effects of the Invention As described above, according to the present invention, the mover is a pair of roller bearings whose rotating axes are perpendicular to each other in a plane perpendicular to the direction of movement of the mover. Since it is elastically supported, it can be reliably supported without radial distortion by a small number of roller bearing pairs. Therefore, the structure is simple and manufacturing is easy. In addition, even if the parallelism of the circular cross-sectional axis is slightly off, the elastic contact of the roller bearing pair allows
This has the effect that the movable element can move smoothly.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing an embodiment of the present invention, Figure 2 is a cross-sectional view showing an embodiment of the invention.
The figure is a plan view thereof, and FIG. 3 is a plan view showing an embodiment in which the present invention is applied to a voice coil type linear motor.
FIG. 4 is a cross-sectional view taken along line A-A, FIG. 5 is a cross-sectional view showing an embodiment in which the present invention is applied to a semiconductor linear motor, FIG. 6 is a cross-sectional view of a conventional device, and FIG. is its plan view. 1 is a stator, 2 is a mover, 10 and 11 are circular cross-section shafts, 12a, 12b, 13a, 13b, 14,
15 is a pair of roller bearings, 19a, 19b, 2
0a and 29b are compression coil springs.

Claims (1)

[Scope of Claims] 1. First and second circular cross-sectional shafts arranged on both sides of the movable element parallel to the moving direction of the movable element, and elastically attached to the movable element via an elastic member. an auxiliary member, and two sets of roller bearings that are rotatably provided on the movable element so that their rotational axes are substantially orthogonal to each other in a plane perpendicular to the direction of movement of the movable element, and abut on the first circular cross-sectional shaft. and a pair of roller bearings rotatably provided on the auxiliary member so that their rotation axes are substantially orthogonal to each other in a plane perpendicular to the direction of movement of the movable element; A linear motion guide device for a linear motor, comprising at least one pair of roller bearings that abuts the second circular cross-sectional shaft by the elastic force of an auxiliary member. 2. An armature coil is wound between two pairs of roller bearings spaced a certain distance apart in the direction of movement of the movable element, and two opposing sides of the armature coil are formed by a permanent magnet on the stator side and a yoke. 2. The linear motion guide device for a linear motor according to claim 1, wherein the device is disposed in an air gap magnetic field.