JPH05180714A - Pulley device for measuring tension - Google Patents

Abstract

PURPOSE:To measure tension of a line-shaped body or a band-shaped body, such as a driving belt, a chain, a wire etc., in a compact structure. CONSTITUTION:An inside mounting member 3 is fitted to an outer-fixing part. A line-shaped body or a band-shaped body is wound on the outer-periphery surface of an outside pulley member 2. A bearing member 4 is provided between the outside pulley member 2 and the inside mounting member 3. The outside pulley member 2 is provided with an engagement part 2a which is engaged with and fixed to an inner ring 4b of the bearing member 4, a mounting part 2b which is mounted on and fixed to an outside fixing part, and a rod-shaped part 2c which connects the engagement part 2 to the mounting part 2b. Deformation of the rod-shaped part 2c is detected by a deformation-detection means such as a distortion gauge, thus measuring tension of the line-shaped body or the band-shaped body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a transmission belt and a chain.
The present invention relates to a tension measuring pulley for measuring the tension of a linear body such as a wire or a wire, or a belt-shaped body.

[0002]

2. Description of the Related Art Conventionally, in order to measure the tension of a linear body or a belt-shaped body such as a belt, a chain or a wire, a force is applied to a linear portion between pulleys, which is generated at that time. This is done by measuring the amount of deformation. Also, idler
There is also known a method of measuring the tension by installing a load cell on the attachment portion of the battery.

[0003]

However, in any of the above-mentioned methods, the tension is measured by attaching another device to the original device, so that there is a problem that the entire size increases. .. In addition, due to the increase in size, there are cases in which installation is not possible due to layout restrictions.

The present invention has been made in view of the above points, and has a compact structure, and is a tension measuring pulley device capable of measuring the tension of a linear body or a belt-like body such as a transmission belt, a chain, and a wire. Is provided.

[0005]

The invention according to claim 1 is a tension measuring pulley device for measuring the tension of a linear body or a belt-shaped body such as a transmission belt, a chain, and a wire. An outer pulley member around which a linear body or a belt body is wound around an outer peripheral surface, an inner mounting member mounted to an external fixing portion, an inner ring provided between the outer pulley member and the inner mounting member, A bearing member having an outer ring and rolling elements arranged between them; and the inner mounting member is a fitting part fitted and fixed to the inner ring of the bearing member and a mounting part fixed and fixed to an outer fixing part. And a rod-shaped portion that connects the fitting portion and the mounting portion, and a deformation detection unit that detects deformation of the rod-shaped portion is provided.

In the invention of claim 2, the deformation detecting means is a strain gauge arranged in the rod-shaped portion.

The invention of claim 3 is a transmission belt and a chain.
A tension measuring pulley device for measuring the tension of a linear body or a strip-shaped body such as a wire, a wire, and the like, and an outer pulley member around which the linear body or the strip-shaped body is wound around an outer peripheral surface, An inner mounting member that is mounted on the fixed portion; and a bearing member that is provided between the outer pulley member and the inner mounting member and that has an inner ring, an outer ring, and rolling elements that are arranged between them. The inner mounting member has a fitting portion that is fitted and fixed to the inner ring of the bearing member, a mounting portion that is fixed to the outer fixing portion, and a rod-shaped portion that connects the fitting portion and the mounting portion, Displacement detecting means for detecting a change in a gap between the fitting portion and the mounting portion of the inner mounting member is provided.

[0008]

The deformation of the rod-shaped portion is detected directly by the strain gauge or indirectly by a change in the distance between the fitting portion and the mounting portion of the inner mounting member, and thereby, it is added to the pull member. The force is detected and the tension can be measured.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In FIG. 1 and FIG. 2 showing the overall structure, 1
Is a tension measuring pulley device for measuring the tension of a linear body or a belt-shaped body such as a power transmission belt, a chain, a wire, etc., and an outer pulley around which the linear body or the belt-shaped body is wound. −
The rear member 2 includes an inner mounting member 3 mounted on an external fixing portion (not shown), and a bearing member 4 interposed between the outer pulley member 2 and the inner mounting member 3. ..

As is well known, the bearing member 4 includes an inner ring 4a, an outer ring 4b, and rolling elements 4 arranged therebetween.
have c.

As shown in FIGS. 3 and 4, the inner mounting member 3 has an annular first fitting portion 3a fitted and fixed to the inner ring 4a of the bearing member 4, and an outer fixing portion (not shown). It has an annular mounting portion 3b that is mounted and fixed to, and rod-shaped portions 3c and 3c that connect the fitting portion 3a and the mounting portion 3b.
The first fitting portion 3a has a brim-shaped stop portion 3d for locking the bearing member 4 projecting from one side of the outer peripheral portion, and the stop ring 5 on the other side.
A circumferential groove 3e engaged with is recessed. Then, the inner ring 4a of the bearing member 4 is located between the stopper portion 3d and the circumferential groove 3e. A shaft hole 3f is formed in the mounting portion 3b, and a mounting member (not shown) is fitted into the shaft hole 3f to be mounted and fixed to the external fixing portion.

The outer pulley member 2 has a pulley portion 2a around which a linear member or a belt member is wound, and the pulley portion 2a.
Ribs 2b projecting radially inward from the inner peripheral surface of the
And a second fitting portion 2c provided on the inner peripheral edge of the connecting rib 2b and fitted with the outer ring 4b of the bearing member 4. On the inner peripheral portion of the second fitting portion 2c, a brim-shaped stop portion 2d for locking the bearing member 4 is projectingly provided on one side and a snap ring 6 is provided on the other side.
The circumferential groove 2e engaged with is recessed. Then, the outer ring 4b of the bearing member 4 is located between the stopper portion 2d and the circumferential groove 2e.

Next, the principle of measuring the tension in the above apparatus will be described with reference to FIGS.

FIG. 7 shows a case in which one strain gauge is attached to the upper and lower surfaces of the rod-shaped portions 3c, 3c of the inner mounting member 3 to detect the load. This is a rod-shaped portion 3c,
This is an example of a case where the load is set to act in the longitudinal direction F1 (axial direction) of 3c, one rod-shaped portion 3c is compressed in the longitudinal direction, and the other rod-shaped portion 3c is pulled in the longitudinal direction. In this case, strain gauges 11a, 11b (11c, 11d) are attached to the upper and lower surfaces of the rod-shaped portion 3c in parallel with the longitudinal direction, the force acting by detecting the strain is detected, and the force is converted. It is possible to measure the tension of the linear body or the belt-shaped body wound around the outer periphery of the outer pulley member 2. Specifically, as shown in FIG. 8, a Wheatstone bridge circuit 12 is assembled. The applied load can be detected by applying a voltage between the terminals P1 and P3 of the circuit 12 and detecting a voltage change between the terminals P2 and P4.

Further, in FIG. 9, rod-shaped portions 3c, 3c
The case where the load is set to act in the cross-sectional direction F2 of is shown. Each rod-shaped portion 3c undergoes shear deformation in the cross-sectional direction F2. In this case, strain gauges 13a, 13b (13e, 13e, 13e,
13f) and 13c, 13d (13g, 13h) are attached, the applied load is detected by detecting the strain, and by converting it, the linear shape wound around the outer periphery of the outer pulley member 2 The tension of the body or strip can be measured. 90 strain gauges attached to the same surface
The strain gauges 13a, 13c, 13 have an angle of °.
e and 13g are oriented in the same direction, and other strain gauges 13
b, 13d, 13f and 13h are different from each other by 90 ° and are oriented in the same direction. The Wheatstone bridge circuits 14 and 15 assembled for detection are shown in FIGS.
Shown in 1. The applied load can be detected by applying a voltage between the terminals P1 and P3 of these circuits 14 and 15 and detecting a voltage change between the terminals P2 and P4.

In the above embodiment, the example in which the bearing member 4 is fixed by using the retaining rings 5 and 6 has been described, but as shown in FIGS. 12 to 15, the outer pulley member 2 is used.
1 inner peripheral surface 21a and the outer peripheral portion 22a of the inner mounting member 22
On the other hand, the present invention can also be applied to a structure in which the outer ring 4a and the inner ring 4b of the bearing member 4 are fitted and fixed by press fitting. In the case of this example, the inner mounting member 22 has a central portion 22c connected to the outer peripheral portion 22a via a rod-shaped portion 22b.
Has a screw rod portion 22d, which is screwed to an external fixing portion (not shown) by the screw rod portion 22d.

The outer peripheral surface of the pulley portion 2a of the outer pulley member 2 has a flat pulley shape used for driving a flat belt or driving a V-ribbed belt or a toothed belt on the back side. However, by changing to V-belts, V-ribbed belts, toothed belts, chain sprockets, wire sheaves, etc., various belts, chains, wires, etc. It can be used for measuring the tension of the linear body or the strip body. In addition, the outer pulley member
By using the tire as the rear portion, the load on the installation surface of the tire and the load in the traveling direction can be detected.

Further, in the above embodiment, the rod-shaped portions 3c, 3c.
Has been described as extending in the left-right opposite direction, but the same can be applied to the case where there is only one rod-shaped portion. Further, even in the case of being constituted by three or more rod-shaped portions, it can be similarly applied by detecting the shear strain and the extension compression strain applied to the rod-shaped portions.

When used for a flat pulley, the outer ring 4a of the bearing member 4 is also used as an outer pulley member, the outer pulley member 2 is omitted, and the outer peripheral surface of the outer ring 4a is directly pulled. It can also be used as a surface.

Further, in the above embodiment, the strain gauge 11 provided on the rod-shaped portion 3c of the inner mounting member 3 is used for the outer pour.
The tension of the linear body or the belt-shaped body wound around the outer periphery of the rear member 2 is measured, but in addition, the change in the distance between the first fitting portion 3a and the mounting portion 3b of the inner mounting member 3 is detected. It is possible to measure the tension by providing a displacement detection sensor for detecting the change in the interval.

For example, when a load acts in the longitudinal direction of the rod portion 3c, as shown in FIG. 16, a mounting base 31 is provided on the inner peripheral surface side of the first fitting portion 3a, and the mounting base 31 is displaced. While the sensor 32 (for example, an eddy current type displacement sensor) is provided, the mounting portion 3b is provided with the target 33, and the displacement sensor 3 is provided.
A gap 34 is formed between the front surface of the second unit 2 and the target 33, and the displacement sensor 32 and the target 33 constitute the displacement detecting means 41. Then, when the relative position changes between the first fitting portion 3a and the mounting portion 3b due to the load acting, the change in the gap 34 is caused by the change in the displacement sensor 32.
Detected by. In the example shown in FIG. 16, two displacement sensors 32 are provided in the direction in which the force acts,
The load can be detected by providing only one or a plurality of loads. However, when detecting only one, the first fitting part 3
Since the gap 34 between the displacement sensor 32 and the target 33 changes even when a torsional force centering on the vicinity of the center of the pool acts between a and the mounting portion 3c, Since it may be detected that a load has occurred, it is desirable to provide at least two and take the average thereof as shown in FIG.

When a load acts in the direction of the cross section of the rod-shaped portion 3c, it can be constructed as shown in FIG. Here, 35 is a mount, 36 is a displacement sensor, 37
Is a target, 38 is a gap, and 42 is a displacement detecting means. In this case, unlike the case shown in FIG. 16, since the influence of the torsional force is not so great, there is no problem even if the load is detected by only one displacement sensor. It is more accurate to detect the load from the displacement detected by the sensor.

In the above embodiment, the targets 33 and 37 are mounted on the mounting portion 3b, and the displacement sensors 32 and 36 are mounted on the first fitting portion 3a.
However, conversely, the target may be provided in the first fitting portion 3a and the displacement sensor may be provided in the mounting portion 3b.

In addition, since the eddy current displacement sensor reacts with a conductor, if the material on the side where the target is provided is made of metal such as aluminum or steel plate, it is not necessary to provide the target. The load can be detected by using a part of the first fitting portion 3a and the mounting portion 3b as a target. Further, the mounting base may be omitted, and the displacement sensor may be directly mounted on the first fitting portion 3a and the mounting portion 3b, or a part of the displacement sensor may be embedded by cutting.

[0026]

As described above, according to the invention of claims 1 to 3, the deformation of the rod-shaped portion is directly caused by the strain gauge, or the distance between the fitting portion and the mounting portion of the inner mounting member is increased. Is detected indirectly, and the force applied to the outer pulley member is thereby detected.
It is possible to easily measure the tension of linear bodies or belt-shaped bodies such as power transmission belts, chains, and wires.

[Brief description of drawings]

FIG. 1 is a front view of a tension measuring pulley device.

FIG. 2 is a sectional view of the same.

FIG. 3 is a front view of an inner mounting member.

FIG. 4 is a sectional view of the same.

FIG. 5 is a front view of an outer pulley member.

FIG. 6 is a sectional view of the same.

FIG. 7 is an explanatory diagram showing the principle of tension measurement.

FIG. 8 is an explanatory diagram showing a detection circuit using a distortion gauge.

FIG. 9 is an explanatory diagram showing another principle of tension measurement.

FIG. 10 is an explanatory diagram showing a detection circuit using a distortion gauge.

FIG. 11 is an explanatory diagram showing another detection circuit based on a distortion gauge.

FIG. 12 is a front view of an outer pulley member according to another embodiment.

FIG. 13 is a sectional view of the same.

FIG. 14 is a front view of an inner mounting member according to another embodiment.

FIG. 15 is a sectional view of the same.

FIG. 16 is a view similar to FIG. 7 for a modified example.

FIG. 17 is a view similar to FIG. 9 for a modified example.

[Explanation of symbols]

 1 Pulley device for tension measurement 2 Outer pulley member 3 Inner mounting member 3a First fitting part 3b Mounting part 3c Rod part 4 Bearing member 4a Outer ring 4b Inner ring 4c Rolling element 11a to 11d Strain gauge 12 Hoi-wheel Stone bridge circuit 13a to 13h Strain gauge 14,15 Wheelstone bridge circuit 41,42 Displacement detection means

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[Procedure amendment]

[Submission date] January 23, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 11

[Correction method] Change

[Correction content]

FIG. 11

Claims (3)

[Claims] 1. A tension measuring pulley device for measuring the tension of a linear body or a belt-shaped body such as a power transmission belt, a chain or a wire, wherein the linear body or the belt-shaped body is wound around an outer peripheral surface. The outer pulley member to be hung, the inner mounting member to be mounted on the external fixing portion, the inner ring, the outer ring, and the rolling member disposed between the outer pulley member and the inner mounting member. A bearing member having a moving body, wherein the inner mounting member includes a fitting portion fitted and fixed to an inner ring of the bearing member, a mounting portion fixed to an outer fixing portion, the fitting portion and the mounting portion. And a rod-shaped portion connecting
A tension measuring pulley device comprising deformation detecting means for detecting deformation of the rod-shaped portion. 2. The tension measuring pulley device according to claim 1, wherein the deformation detecting means is a strain gauge arranged on the rod-shaped portion. 3. A tension measuring pulley device for measuring the tension of a linear body or a belt-shaped body such as a power transmission belt, a chain or a wire, wherein the linear body or the belt-shaped body is wound around an outer peripheral surface. The outer pulley member to be hung, the inner mounting member to be mounted on the external fixing portion, the inner ring, the outer ring, and the rolling member disposed between the outer pulley member and the inner mounting member. A bearing member having a moving body, wherein the inner mounting member includes a fitting portion fitted and fixed to an inner ring of the bearing member, a mounting portion fixed to an outer fixing portion, the fitting portion and the mounting portion. And a rod-shaped portion connecting
A tension measuring pulley device comprising displacement detecting means for detecting a change in a gap between the fitting portion and the mounting portion of the inner mounting member.