JPH0475459A - Linear motor - Google Patents

Abstract

PURPOSE:To eliminate necessity for a pedestal so as to reduce a cost of manufacture by providing constitution such that grooves of squared shape with one side open, provided in a base board, and two steel shafts in each one of the grooves are provided to roll rolling members on these shafts. CONSTITUTION:Two U-shaped grooves 8 are parallely formed on a based board 1 having primary iron cores 2, and two steel shafts 4 are provided along the lengthwise direction of the groove 8 corresponding to each one of the grooves. Rolling members 5, 6 of steel balls are mounted onto rails, formed of these two steel shafts 4, and rolled along the rails. A secondary iron core 3 is mounted through these rolling members 5, 6, and the rolling member 6 is opposed to a V-shaped groove 7 provided in this iron core 3. In this way, necessity for a metallic pedestal is eliminated, and a linear motor of rolling characteristic excellent in surface roughness, straightness, etc., and of wear resistance can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a beam near motor, and particularly to a structure for maintaining the positions of a primary iron core and a secondary iron core.

[Conventional technology]

This type of linear motor will be explained with reference to FIGS. 3 and 4.

A linear motor is configured to generate parallel motion force by applying magnetic force between a primary iron core and a secondary iron core. Therefore, an accurate positional relationship must be maintained between the primary core and the secondary core.

Furthermore, the primary and secondary cores must move smoothly. Therefore, rolling members (rollers) are placed between these iron cores.
Furthermore, in consideration of wear resistance, a metal with a certain degree of hardness is provided below the rolling member.

The primary iron core 31 is provided on a base 32, and a gap adjustment pin 37 is press-fitted into the base 32. A platform 33 is placed on this pin 37 as a hard receiver. The receiver has a V-shaped groove 38 in the base 33, in which a hard ball rolling member 36 is placed. Further, a cylindrical rolling member 35 is mounted on a flat surface parallel to the V-shaped groove 38. These rolling members 35.36
A secondary iron core 35 is placed thereon, and a V-shaped groove 39 provided in this secondary iron core 34 faces the V-shaped groove 38 of the above-mentioned support base 33. The distance between the primary core 31 and the secondary core 34 is adjusted by the amount of press-fitting of the gap adjustment pin 37.

[Problem to be solved by the invention]

As mentioned above, in a linear motor, the holder requires a stand 33 just to prevent wear caused by rolling members, and the holder requires a gap adjustment pin 37 to cover the accuracy of the holder. This is causing an increase in costs in areas that are not directly related to this.

In addition, it is generally difficult to improve the accuracy of the 7-shaped groove, and even more so, forming a receiver with good wear resistance on the base 33 results in a significant increase in cost.

[Means to solve the problem]

The present invention proposes a near motor, which is superior in terms of manufacturing costs by adopting a structure that eliminates the need for the receiver stand 33, which causes the above-mentioned increase in costs.

Specifically, the present invention has a U-shaped groove provided in the base, two steel shafts are provided in one of the grooves, and the rolling member is configured to roll on the shaft, so that the receiver can be mounted on the base. This has been achieved by omitting the following.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Two U-shaped grooves 8 are formed in parallel in the base 1 having the primary iron core 2. This U-shaped groove 8 corresponds to 2
A book steel shaft is provided along its length. Steel ball rolling members 5 and 6 are placed on the rails formed by these two steel shafts 4,
Roll along the rail. A secondary core 3 is mounted via the rolling members 5 and 6, and the rolling member 6 faces a V-shaped groove 7 provided in the core 3.

The U-shaped groove 8 is formed at the same time as the molding of the base l,
Regarding its depth and width, it is possible to form it with fairly high precision. Generally, steel balls and steel shafts with fairly high precision can be easily obtained. Therefore, a rolling surface with excellent surface accuracy and straightness can be obtained. In addition, if it is necessary to adjust the gap between the primary iron core 2 and the secondary iron core 3, the steel shaft 4
This can be easily done by selecting the diameter of

〔Effect of the invention〕

As explained above, the present invention uses two steel shafts installed in the U-shaped grooves provided on the base as the rolling surfaces of the rolling member, thereby eliminating the need for a metal support and providing a flat surface. It has the effect of realizing a linear motor with excellent rolling characteristics such as roughness and straightness, and wear resistance.

7...7-shaped groove, 8...Full-shaped groove.

Claims (1)

[Scope of Claims] A linear motor comprising at least a primary core, a secondary core, and a rolling means that enables reciprocating motion while maintaining a constant distance between the primary core and the secondary core,
The rolling means includes: at least one U-shaped groove provided in a fixed positional relationship with the primary iron core; two steel shafts mounted parallel to one of the U-shaped grooves; A linear motor characterized by having a spherical rolling member in contact with two steel shafts.