JPH01275908A - Rectilinear motion bearing - Google Patents

Abstract

PURPOSE:To miniaturize bearings without causing any shift in a movable block by forming linear guides and racks on bearing surfaces on the top of a base and the underside of a movable block, and inserting between them rolling bodies which consist of rollers and pinions capable of rolling and mesh engagement respectively. CONSTITUTION:V-shaped linear guides 5a and 5b and racks 6a and 6b are arranged opposingly on opposed faces corresponding to the underside of a moving block 1 and the top surface of a base 2, and rollers 8a and 8b which are composed of rollers 3 capable of rolling and pinions 4 capable of mesh engagement are inserted between them. In addition, a cylindrical roller 9 which rolls over other side face 9a of the base 2, and magnets 10a and 10b facing against the movable block 1 and base 2 are arranged so that the movable block can be smoothly shifted without any positional deviation and the bearing can be made compact in its size.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the configuration of a linear motion bearing mechanism, and particularly to a linear motion bearing for a small linear motor.

(Prior Art) As shown in FIG. 4, a conventional linear motion bearing has bearing surfaces 23a and 23b provided on one side of a substantially U-shaped base 21 and a mover 22 that is movable thereon. are provided with linear guide portions 24a and 24b, respectively, and a plurality of spheres 25, which are rolling elements capable of linear movement while rolling along the linear guide portions 24a and 24b, are interposed therebetween. Due to the mutual magnetic attraction force between a magnet (h) 29a supported by a retainer 26a and housed inside the base 21 and a magnet (h) 29b provided on the bottom surface of the mover 22 so as to be able to move linearly at an interval of , given a preload. Similarly, a cylindrical roller 28 capable of linear movement while rolling on bearing surfaces 27a and 27b provided on the upper surface of the other side of the base 2 and the bottom surface of the other side of the movable member is mounted on the bearing surface 27a.

Similar to the sphere 25, the cylindrical roller 28 is supported by a retainer 26b, and preloaded by the magnetic attraction force of magnets 29a and 29b.

Furthermore, as shown in FIG. 5, a retainer 26a.

26b, a pinion gear 33 is attached to the retainer 2 to prevent the ball 25 and the roller 28 from shifting due to friction or the like.
6a, 26b, and this pinion gear 33
A gear mechanism is formed by meshing with a pair of racks 3 and 32 disposed so as to face the base 21 and mover 22, and linear interlocking is performed in the direction of the arrow shown in FIGS. 4 and 5. It can be carried out. At this time, of course, the cylindrical roller 28 also rolls between the bearing surfaces 27a and 27b.

(Problem to be solved by the development ψ1) In the conventional linear motion bearing, there are two spheres 25 and a roller 2.
8 are arranged at required intervals, each retainer 2
6a and 26b are required, and furthermore, the ball 25 and the roller 28 are configured by a pinion gear 33 provided on a retainer and racks 31, 32, etc. provided to mesh with the pinion gear 33 provided on the retainer in order to prevent the ball 25 and the roller 28 from shifting due to friction or the like. A separate mechanism was required. For this reason, the retainer 26a is used particularly when constructing a linear motion bearing for a small linear motor.

There were problems such as size limitations due to the gear mechanism provided by 26b.

The present invention has been devised to solve the above problems.

(Means for Solving the Problems) The present invention provides means for achieving the above objects. The outline thereof will be explained with reference to the accompanying drawings illustrating a first embodiment of the present invention. That is, Figures 1 to 2 (
As shown in A) and CB), in a linear motion bearing equipped with a movable element and a base configured to be able to linearly move each other via rolling elements, a bearing formed on one side of the movable element 1 and the base 2. A pair of linear guide parts 5a, 5b provided opposite to each other on the surfaces, and rack parts 6a, 6b provided with a plurality of teeth at the same interval in parallel with the lower surface of the end of the mover l and the upper surface of the end of the base 2. They are provided facing each other.

Furthermore, a linear guide portion 5a between the base 2 and the movable element 1,
A rolling element 8a has a roller part 3 formed to be able to roll along a roller 5b, and a pinion part 4 equipped with a plurality of teeth that can mesh with rack parts 6a and 6b provided on the movable element 1 and the base 2. , 8b, each of the rack portions 6a
, 6b and the bio-on part 4 mesh with each other, and the roller part 3 rolls along the pair of linear guide parts 5a, 5b, so that the mover 1 can move linearly together with the rolling elements 8a, 8b. The present invention provides a linear motion bearing configured as follows.

(Function) According to the present invention, the rolling element having the pinion part and the roller part is disposed between the movable element and the base each having a rack part on the bearing surface, so that the rolling element has the pinion part and the roller part. The rack parts form a meshing gear mechanism, and the rolling elements maintain a predetermined distance from each other and can move linearly together with the roller part rolling along the linear guide part without causing positional deviation.

(Example) The present invention will be described in detail below with reference to the accompanying drawings.

1 and 2(A) and 2(B) illustrate a first embodiment of the invention. Symbol 1 is a mover, 2 is a base, 3.
4 is a roller portion and a pinion portion 5a provided on a rolling element 8a or 8b, respectively, which will be described later.

5b is a V provided oppositely on the mover 1 and the base 2, respectively.
A letter-shaped linear guide part, 6a is a rack part provided on the lower surface of the end of the movable element 1, 6b is a rack part provided on the upper surface of the end of the base 2, 8a and 8b are rolling elements, 9 is the other side surface 9a of the base 2 The cylindrical roller 10a and the fob rolling thereon are magnets arranged to face the movable element 1 and the base 2, respectively. A movable element 1 has a linear guide section 5a on one side of the lower surface and a rack section 6a adjacent thereto, and a base 2 has a linear guide section 5a on one side of the upper surface and a rack section 6a adjacent thereto. and a rolling element 8a which is arranged parallel to each other so that the respective constituent parts face each other, and has a roller part 3 and a pinion part 4 between the movable element 1 and the base 2,
8b is interposed between the pinion portion 4 and the rack portion 6a.
, 6b are displaced while meshing with each other, and at the same time, the roller section 3 rolls along the linear guide sections 5a, 5b, thereby displacing the rolling elements 8a, 8b. That is, the rolling elements 8a, 8
b can be displaced together with the roller portion 3 while maintaining a constant distance due to the meshing structure between the pinion portion 4 and the rack portions 6a and 6b. At this time, the cylindrical roller 9 rolls on the other side surface 9a of the base 2. Therefore, the movable element 1 moves smoothly linearly on the base 2 due to the attraction force of the girder magnet 10a provided on its lower surface and the magnet 10b placed opposite to it inside the base 2.

, FIG. 3 shows a second embodiment of the present invention. This embodiment has a configuration in which a linear guide shaft that supports the roller section is provided. Reference numeral 11 indicates a movable member, 12 indicates a base, and 13.14 indicates a plurality of rolling elements 18, respectively.
The grooved roller portion and the pinion portion, 15a, 15b, are linear guide shafts, 16a, 16b, which are fitted into linear guide bearing grooves 19a, 19b, which are formed in the lower surface of one side of the movable element 11 and the upper surface of one side of the base 12, respectively. 1 is a rack portion disposed opposite to one example of the lower surface of the movable member 11 and the upper surface of one side of the base 12.

Similar to FIGS. 2(A) and 2(B) illustrating the first embodiment,
pinion part 14 and rack part 16a.

16b forms a gear mechanism, and the linear guide bearing groove 1
Linear guide shafts 15a, 15b attached to 9a, 19b
The seven-shaped groove roller portion 13 is configured to be able to roll in a straight direction along with the gear mechanism. Therefore, the movable element 11 can smoothly linearly move on the base 12 as the rolling elements 18 move.

(Effects of the Invention) As detailed above, according to the present invention, the movable element and the base are provided with a rack portion and a linear guide portion facing each other, and a pinion portion and a linear guide portion that mesh with the rack portion are provided with a rack portion and a linear guide portion facing each other. The configuration in which the rolling elements having the roller portions that roll along the movable member are displaced while maintaining a predetermined interval has the effect that the movable element can be smoothly displaced without misalignment. Furthermore, the same effect as described above can be obtained even if a linear guide shaft is provided in the linear guide bearing groove bored on the upper and lower surfaces of the movable element and the base, and a rolling element equipped with a 7-shaped groove roller that is displaced along this axis is adopted. is obtained.

Furthermore, since a retainer and a separately required gear mechanism as in the conventional example are not employed, there are advantages such as miniaturization of the linear motion bearing without being limited by the shape of the retainer.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a partially cutaway perspective view of a linear motion bearing, and FIG. 2 (A)
1 is a side view of the main part of FIG. 1, and FIG. 1B is a sectional view taken along the line xx in FIG. FIGS. 3(A) and 3(B) show a second embodiment of the present invention,
FIG. 3(A) is a side view of the main part of the bearing mechanism. (B) is a sectional view taken along the line YY of (A). FIG. 4 is a partially cutaway perspective view of a conventional linear motion bearing. FIG. 5 is a side view with a part of the main part of FIG. 4 cut away. 1.11...Mover, 2.12...Base, 3...
- Roller part, 4.14...Pinion part, 5a. 5b--Linear guide section, 6a, 6b, 16a. 16b... Rack part, 8a, 8b, 18... Rolling element, 10a, 10b... Magnet, 13... Seven-shaped groove roller part, 15a, 15b... Linear guide shaft, 19
a, 19b...Linear guide bearing groove. Applicant Copal Electronics Co., Ltd. Agent Patent Attorney Sakae Kobayashi Figure 1 4 碍ON'f' 100
10b...

Claims (1)

[Claims] 1. In a linear motion bearing mechanism comprising a base and a movable element that are capable of linear movement relative to each other via rolling elements, a pair of a pair of facing rack parts each having a plurality of teeth at the same spacing, each provided with a facing linear guide part and a pair of facing rack parts parallel to the linear guide part, and a roller part that can roll along the linear guide part. and a pinion portion that can mesh with the pair of rack portions, the rack portion and the pinion portion mesh with each other, and the roller portion linearly moves along the linear guide portion, thereby moving the movable element. A linear motion bearing characterized by displacement in a predetermined direction. 2. A pair of linear guide shafts are provided so as to face the bearing surface composed of the lower surface of the mover and the upper surface of the base, and a V-shaped groove roller portion that fits into the linear guide shafts and can freely roll is provided. A linear motion bearing according to claim 1.