JP3779008B2 - Linear position detector mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linear position detector mounting structure, and in particular, by providing a spherical sliding bearing and a universal joint, it absorbs misalignment due to mounting errors, prevents core galling and friction, and stabilizes output characteristics. Related to various improvements.
[0002]
[Prior art]
Conventionally, the configuration shown in FIG. 3 has generally been adopted as a linear position detector mounting structure that has been used. That is, what is indicated by reference numeral 1 in FIG. 3 is a cylindrical case having a detection coil 2, and a detection shaft 5 having a core 4 is movable in the direction of arrow A in the guide hole 3 of this case 1. A detected member (not shown) such as a robot is connected to the tip of the detection shaft 5. The case 1 is fixed to the base side of a machine tool or the like by an attachment member 6.
Accordingly, the detection shaft 5 moves in accordance with the movement of the arm or the like to which the member to be detected is connected, and the linear position is detected.
[0003]
[Problems to be solved by the invention]
Since the conventional linear position detector mounting structure is configured as described above, the following problems exist.
That is, since the mounting member and the case are fixed and the detection shaft has a linear configuration, the portion that absorbs the deviation due to the mounting error when the detection shaft is mounted on a movable member such as a robot is the detection shaft. And only the clearance of the inner diameter of the case. However, this clearance should be as small as possible in terms of the output voltage characteristics of the detector, but if it is made small, it will cause galling and friction, and it is desirable to make it as large as possible to absorb mounting errors. The error was large and the dilemma was in conflict.
[0004]
The present invention has been made to solve the above problems, and in particular, by providing a spherical sliding bearing and a universal joint, it absorbs misalignment due to mounting errors, prevents core galling and friction, and outputs characteristics. An object of the present invention is to provide a linear position detector mounting structure capable of measuring the stability.
[0005]
[Means for Solving the Problems]
The linear position detector mounting structure according to the present invention is a straight line in which a detection shaft having a core is moved to detect a linear position in a cylindrical case having a detection coil, and the case is attached to a mounting member. In the position detector mounting structure, the case is rotatably mounted on the mounting member via a spherical plain bearing, and a universal joint is provided on the detection shaft.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a linear position detector mounting structure according to the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as a prior art example.
1 is a cylindrical case having a detection coil 2, and a detection shaft 5 having a core 4 is provided in the guide hole 3 of the case 1 so as to be movable in the direction of arrow A. A detected member (not shown) such as a robot is connected to the tip 5 a of the detection shaft 5 via a universal joint 11. The case 1 is fixed to a base (not shown) side of a machine tool or the like by an attachment member 6.
[0007]
The mounting member 6 and the case 1 are connected via a spherical plain bearing 10, and the spherical plain bearing 10 is formed on both outer surfaces of the case 1 and has a hemispherical convex spherical portion 10a, and the mounting member. 6 and a concave spherical portion 10b that is in sliding contact with each convex spherical portion 10a. Each convex spherical portion 10a is configured to be in sliding contact with each concave spherical portion 10b.
Therefore, even when the tip 5a is connected to a movable part (not shown) such as a robot in the above-described configuration and the axis center of the movable part and the axis center of the case 1 are deviated or deviated. The tip 5a can be bent by the universal joint 11 as shown by a solid line and a dotted line, and the case 1 is also rotated by the spherical plain bearing 10 as shown by a solid line and a dotted line, thereby avoiding eccentricity of the detection shaft 5 itself. It is possible to prevent galling and damage due to the contact between the inner wall of the guide hole 3 and the core 4.
[0008]
【The invention's effect】
Since the linear position detector mounting structure according to the present invention is configured as described above, the following effects can be obtained. That is, since the detection shaft is provided with a universal joint and the case is provided on the mounting member via a spherical plain bearing, the center deviation such as the detection axis attachment error is absorbed by the universal joint and the spherical plain bearing. Therefore, it is possible to prevent galling and friction of the core, minimize the clearance between the core and the inner wall of the guide hole of the case, and obtain stable output characteristics.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a linear position detector mounting structure according to the present invention.
FIG. 2 is a configuration diagram showing a main part of FIG. 1;
FIG. 3 is a block diagram showing a conventional structure.
[Explanation of symbols]
1 Case 2 Detection coil 4 Core 5 Detection shaft 6 Mounting member 11 Free joint

Claims (1)

The detection shaft (5) having a core (4) is moved into a case (1) having a cylindrical detection coil (2) to detect a linear position, and the case (1) is attached to a mounting member (6 ), The case (1) is rotatably attached to the attachment member (6) via a spherical plain bearing (10) and freely attached to the detection shaft (5). A linear position detector mounting structure characterized by providing a joint (11).

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