JPH09243302A - Mounted structure of displacement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a displacement sensor to be mounted in such a way that it functions normally irrespective of its fixed state. SOLUTION: A sensor mounting arm 12, which constitutes a mounted structure of a displacement sensor 2 having a cylindrical sensor main body part 3 and a measuring element 4 moving relative to the sensor main body part 3, includes a housing 21 and a cover member 22. O-rings 32 are aligned in the direction of the axis of the sensor main body part 3 on the outer periphery of the sensor main body part 3. The housing 21 has a through hole 30 through which the sensor main body part 3 can be passed and a mounting hole 31 so formed to continue to the through hole 30 and to have a larger diameter than the through hole, for enclosing the O-rings 32. The cover 22 is a member removably secured to the housing 21 and having a through hole 34 through which the sensor main body part 3 can be passed and an abutting part 36 fitted into the mounting hole 31 in such a way that it can form a space shorter than the length of the alignment of the O-rings 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure, in particular,
The present invention relates to a displacement sensor mounting structure for fixing a displacement sensor having a cylindrical sensor body and a probe that moves relative to the sensor body.

[0002]

2. Description of the Related Art A displacement sensor is used to measure the height of a diaphragm spring used for a clutch. The displacement sensor generally has a cylindrical sensor body and a probe that slides in the axial direction with respect to the sensor body. The displacement sensor has a mounting ring extending from the sensor mounting base, which is fitted around the sensor body, and which is divided into two.
It is fixed to the sensor mount by tightening this mounting ring with bolts. Then, the displacement of the measured object is measured by bringing the probe of the displacement sensor into contact with the measured object.

[0003]

In the above-mentioned conventional configuration,
If the tightening force of the two-piece mounting ring is made too large, the sensor body will be distorted and deformed, making it difficult for the probe to slide, and the displacement cannot be measured accurately. If the tightening force is too small for this reason, the bolt may be loosened due to vibration or the like. If the bolts are loosened, the sensor body is not securely fixed to the sensor mount, and the accuracy of the displacement sensor reproduction decreases. For this reason, it is difficult to balance the tightening condition of the bolts, and it is difficult to attach the displacement sensor so that the bolt functions properly.

An object of the present invention is to make it possible to mount a displacement sensor so that it can function normally regardless of how it is fixed.

[0005]

A displacement sensor mounting structure according to claim 1 is a displacement sensor mounting structure having a cylindrical sensor body and a probe that moves relative to the sensor body. It is provided with a plurality of annular members, a housing, and a cover member. The annular member is a member made of an elastic body that is arranged on the outer peripheral side of the sensor main body in the axial direction of the sensor main body. The housing has a first through hole through which the sensor main body can penetrate, and a mounting hole that is continuous with the first through hole and has a diameter larger than that of the first through hole to accommodate the annular member. The cover member is fitted so as to form a second through hole through which the sensor main body portion can penetrate and a space having a length shorter than the length of the annular member in the installation direction in the mounting hole, and the tip can abut the annular member. A member that has an abutting portion and is detachably fixed to the housing.

In this mounting structure, when the housing in which the elastic member is mounted in the mounting hole and the cover member in which the contact portion faces the housing are fitted into the sensor main body and the cover member is fixed to the housing, the mounting hole is formed by the contact portion. A space having a length shorter than the length of the annular members in the juxtaposed direction is formed therein. Therefore, the annular member mounted in the mounting hole is compressed and deformed by a predetermined amount in the mounting hole, and presses the peripheral surface of the mounting hole and the outer peripheral surface of the sensor body. As a result, the sensor body is fixed to the housing.

When the sensor main body is fixed in this way, the space in the mounting hole is always the same size due to the contact portion, so that the amount of compressive deformation of the annular member is always constant and the sensor main body is pressed. Power becomes constant. Further, since the pressing force of the annular member is due to elastic deformation, it is not strong enough to distort the sensor body. As a result, it is less likely that the tracing stylus will move or the reproducibility will be reduced, and the displacement sensor can be attached so as to function normally regardless of the fixing condition.

The mounting structure for the displacement sensor according to claim 2 is
The structure according to claim 1, wherein the annular member is an O-ring having an inner diameter substantially the same as the outer diameter of the sensor body. In this case, since the commercially available part can be used as the annular member, the displacement sensor can be attached at low cost. The mounting structure of the displacement sensor according to claim 3 is the structure according to claim 1.
Alternatively, in the structure described in the paragraph 2, the cover member is fastened to the housing by bolts. In this case, the size of the space can be surely kept constant simply by fixing with bolts.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a sensor mount 1 according to an embodiment of the present invention mounts a displacement sensor 2, and includes a base 10, a support rod 11 provided upright on the base 10, and a support. It has a sensor mounting arm 12 fixed to the rod 11 so as to be vertically movable. The displacement sensor 2 is
A cylindrical sensor body 3, a probe 4 that slides up and down in the sensor body 3, and a tip projects from the lower surface of the sensor body 3, and a converter that converts the amount of movement of the probe 4 into an electrical signal. (Not shown). The protruding portion of the tracing stylus 4 is covered by the bellows 5.

A male screw portion 25 is formed on the peripheral surface of the support rod 11, and a nut 26 for changing the vertical position of the sensor mounting arm 12 is mounted on the peripheral surface. The sensor mounting arm 12 has a support portion 20 through which the support rod 11 can penetrate at the base end.
And has a housing 21 for mounting the displacement sensor 2 at the tip extending laterally from the base end. Support part 20
The support rod 11 penetrates through, and the nut 26 is arranged on the lower surface of the support portion 20. Further, the support portion 20 is fixed to the support rod 11 by a bolt 27 arranged on the back surface. A cover 22 is fixed to the lower surface of the housing 21.

The housing 21 is a cylindrical member, and is shown in FIG.
As shown in detail in FIG.
The mounting hole 31 has a diameter larger than zero. Three O-rings 32 are vertically mounted in the mounting hole 31. As a result, 3
The O-rings 32 of the book are arranged side by side. The inner diameter of the O-ring 32 is a commercially available O-ring for movement (P type) having substantially the same dimension as the outer diameter of the sensor body 3. The inner diameter of the mounting hole 31 is approximately the same as the outer diameter of the O-ring 32.

The cover 22 is a flange-shaped member,
The sensor body 3 is located at the center, facing the lower surface of the housing 21.
Circular mounting portion 35 having a through hole 34 through which the
And a tubular contact portion 36 extending from the mounting portion 35 into the mounting hole 31. The length of the contact portion 36 is
The length from the tip to the upper bottom of the mounting hole 31 is set to be shorter than the length of the three O-rings 32 arranged side by side in the natural state. As a result, the contact portion 36 causes the mounting hole 31
The O-ring 32 is compressed and deformed in the space 37 formed therein. The cover 22 is detachably fixed to the housing 21 by, for example, four fixing bolts 38.

When mounting the displacement sensor 2 on the sensor mounting base 1 having such a structure, first, the fixing bolt 38 is loosened so that the O-ring 32 mounted in the mounting hole 31 is not compressed. In this state, the sensor main body 3 of the displacement sensor 2 is inserted into the through hole 30 in the housing 21 and moved downward until it substantially coincides with the lower surface of the through hole 34 of the cover 22. Then, the cover 22 is firmly fixed to the housing 21 by tightening the fixing bolt 38. Then, the contact portion 36 makes the space 37 shorter than the natural length of the O-ring 32, and the O-ring 32 is compressed and deformed. When the O-ring 32 is compressed and deformed, the inner peripheral portion of the O-ring 32 presses the outer peripheral surface of the sensor body 3, and the outer peripheral portion presses the inner peripheral surface of the mounting hole 31. As a result, the sensor body 3 is elastically and rigidly supported by the O-ring 32. The deformation amount of the O-ring 32 at this time is constant because the size of the space 37 is always constant. Therefore, the pressing force on the sensor body 3 is always constant. Therefore, the reproducibility of the measurement result in the displacement sensor 2 is improved. Further, since the size of the space 37 is constant regardless of the tightening force of the fixing bolt 38, the displacement sensor 2 can be fixed with a constant force regardless of the fixing condition.

Then, the vertical position of the sensor mounting arm 12 is adjusted according to the height of the object to be measured, and the mounting of the displacement sensor 2 is completed. [Other Embodiments] (a) The number of O-rings 32 is not limited to three, and may be any number as long as it is plural. (B) Instead of the O-ring, an elastic ring having a rectangular cross section may be used. (C) The fixing method of the cover is not limited to the bolt, and other detachable fixing means such as providing a male screw on the outer periphery of the contact portion and providing a female screw on the inner surface of the housing may be used.

[0015]

In the displacement sensor mounting structure according to the present invention, since the space in the mounting hole is always the same size due to the contact portion, the amount of compressive deformation of the annular member is always constant, and the sensor body is The pressing force becomes constant. Further, since the pressing force of the annular member is due to elastic deformation, it is not strong enough to distort the sensor body. As a result, it is less likely that the tracing stylus will move or the reproducibility will be reduced, and the displacement sensor can be attached so as to function normally regardless of the fixing condition.

[Brief description of drawings]

FIG. 1 is a perspective view of a sensor mount according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the housing.

[Explanation of symbols]

 1 Sensor Mounting Base 2 Displacement Sensor 3 Sensor Main Body 4 Measuring Element 12 Sensor Mounting Arm 21 Housing 22 Cover 30, 34 Through Hole 32 O Ring 36 Abutment 37 Space 38 Fixing Bolt

Claims (3)

[Claims] 1. A mounting structure of a displacement sensor having a cylindrical sensor main body and a tracing stylus that moves relative to the sensor main body, wherein an axial direction of the sensor main body is provided on an outer peripheral side of the sensor main body. A plurality of annular members made of an elastic body arranged side by side, a first through hole through which the sensor main body portion can penetrate, and the first through hole.
A housing having a mounting hole that is continuous with the through hole and has a diameter larger than that of the first through hole for mounting the annular member; a second through hole through which the sensor body portion can penetrate; and the mounting hole Has an abutting portion that is fitted so as to form a space having a length shorter than the length of the annular member in the juxtaposed direction, and the tip has an abutting portion that can abut the annular member, and is detachably fixed to the housing. A displacement sensor mounting structure comprising: a cover member. 2. The annular member is an O-ring having an inner diameter substantially the same as the outer diameter of the sensor body.
The displacement sensor mounting structure described in. 3. The displacement sensor mounting structure according to claim 1, wherein the cover member is fastened to the housing with a bolt.