JP2002349511A - Mounting structure of position sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make small the dimensions across the width and over the height of a mounting structure of a position sensor to be mounted on a cylinder and preclude slipping-off of a fixing bolt for fixing the position of the sensor. SOLUTION: The sensor mounting structure 18 according to the invention is equipped with a rail member 24 to be fixed to the outer side face of a cylinder tube 14, a holder 28a installed for holding the position sensor in such a way as slidable along the rail member 24, and a fixing bolt 30a for fixing the holder 28a to the rail member 24, wherein the fixing bolt 30a is furnished with a slip-off preventing mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a position detecting sensor provided with a function of adjusting a detecting position.

[0002]

2. Description of the Related Art Conventionally, fluid pressure cylinders have been used as driving means for transporting and positioning a work or driving various industrial machines. This fluid pressure cylinder is provided with, for example, an accessory part including a cylinder tube and a switch attached to the cylinder tube in order to respond to various needs of a user due to multifunctionalization such as miniaturization, option setting, and the like. I have.

[0003] In view of the hygiene requirement of preventing the propagation of various bacteria due to the liquid adhering to the outer surfaces of the cylinder tube and the switch, the present applicant does not increase the overall shape of the sensor even if the position adjusting mechanism is provided. We propose a position detection sensor that can achieve a small size and light weight, hardly accumulate liquid on the outer surface, and can avoid hygiene problems by allowing attached liquid to drip naturally. (Japanese Patent Application Nos. 2000-56437 and 20)
00-56440).

[0004]

SUMMARY OF THE INVENTION The present invention has been made in connection with the above-mentioned proposal, and it is difficult for liquid to accumulate on the outer surface, and the adhered liquid drops naturally, thereby avoiding hygiene problems. The position of the position detection sensor with respect to the stroke direction of the cylinder can be arbitrarily adjusted, and when the screw for fixing the position of the position detection sensor is loosened, the screw is removed. An object of the present invention is to provide a mounting structure of a position detection sensor capable of preventing detachment.

[0005]

In order to achieve the above-mentioned object, the present invention is mounted on the outside of a cylinder tube,
A mounting structure of a position detection sensor for detecting a position of a piston, the position detection sensor detecting a position of the piston by detecting a magnetic field of a magnet mounted on the piston, and an outer side surface of a cylinder tube. A rail member mounted so as to be separated by a predetermined distance from a holder, a holder that holds the position detection sensor and is provided displaceably along the rail member, and is provided on the holder and protrudes in a direction away from the cylinder tube. And a screw hole formed through the boss portion, and a fixing screw member screwed into the screw hole, wherein one end of the fixing screw member is tightened. By pressing the rail member, the holder is fixed to a predetermined position along the axial direction of the rail member. Further, it is preferable to provide a retaining mechanism for preventing the fixing screw member from being pulled out of the screw hole.

Further, the retaining mechanism has a female screw portion formed at one end of the screw hole and a through hole formed at the other end of the screw hole, and is provided at one end of the fixing screw member. A first screw portion formed, a second screw portion formed on the other end portion side, and a shaft portion formed between the first screw portion and the second screw portion and not screwed to the female screw portion The axial length of the shaft portion is formed longer than the axial length of the first screw portion, and the axial length of the through hole is longer than the axial length of the female screw portion. It is good to form.

Further, it is preferable that the boss is formed to be inclined at a predetermined angle in a direction away from the rail member.

Further, the retaining mechanism includes a female screw portion formed at one end of the screw hole and a through hole formed at the other end of the screw hole, and is provided at one end of the fixing screw member. A shaft part formed, and a screw part formed on the other end side, wherein the fixing screw member is screwed in from the through hole side close to the rail member, and the diameter of the shaft part is changed by the screw. By forming larger than the diameter of the thread root of the part,
It is preferable to prevent the fixing screw member from being pulled out of the screw hole. Further, one end of the fixing screw member may be formed in a tapered shape.

In the mounting structure of the position detection sensor according to the present invention, a fixing screw member for fixing a position to a holder provided along the rail member is provided, and a boss portion of the holder is formed at a predetermined angle. In addition, a retaining mechanism for the fixing screw member is provided in the fixing screw member and the screw hole formed in the boss portion.

According to the present invention, the holder can be firmly fixed by tightening the fixing screw member screwed into the screw hole of the holder and bringing one end thereof into contact with the rail member.

Further, by forming the boss portion inclined at a predetermined angle, the outer dimensions of the holder can be suppressed,
It is possible to prevent the fixing screw member from being pulled out under the action of the retaining mechanism between the fixing screw member and the screw hole.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a mounting structure for a position detecting sensor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view in which a position detecting sensor is attached to a side surface of a cylinder 10 via a sensor mounting mechanism according to an embodiment of the present invention.

The cylinder 10 is formed in a substantially cylindrical shape and has a set of pressure fluid inlet / outlet ports 12 separated by a predetermined distance.
a and 12b, a head cover 15 fixed to one end of the cylinder tube 14 (see FIG. 2), and a rod cover fitted into a screw hole at the other end of the cylinder tube 14. 16.

As shown in FIG. 2, the cylinder 10 has a head cover 15 inside the cylinder tube 14.
Cylinder chamber 1 closed by the rod cover 16
7, a piston rod 21 having one end engaged with the piston 19 and the other end exposed to the outside, and a piston rod 21 mounted in an annular recess of the rod cover 16, and an outer periphery of the piston rod 21. Hole 23 surrounding the surface
Is formed.

A set of pressure fluid inlet / outlet ports 12a,
12b is provided so as to communicate with the cylinder chambers 17a, 17b via passages 27a, 27b, respectively.

A rod packing 29 is mounted on the inner peripheral surface of the rod cover 16 through an annular groove. The rod packing 29 surrounds the outer peripheral surface of the piston rod 21 so that the cylinder chamber 17 is air-tight and liquid-tight. Is held. In addition, a cylindrical bush 33 is mounted on an annular recess formed on the inner peripheral surface of the rod cover 16,
An annular recess formed at the end of the rod cover 16 includes:
A scraper 25 is mounted. The scraper 25
An annular chamber 35 that functions as an oil reservoir for lubricating oil attached to the outer peripheral surface of the piston rod 21 is formed between the piston chamber 21 and the rod cover 16.

The outer peripheral surface of the piston 19 has a cylinder chamber 1
A piston packing 37 slidingly in contact with the inner wall surface of the cylinder 7 and dividing the cylinder chamber 17 into one cylinder chamber 17a and the other cylinder chamber 17b is mounted via an annular groove.
A magnet 39 formed of a ring surrounding the piston 19 is mounted on a portion close to the piston packing 37 via an annular groove.

Cylinder tube 14 and rod cover 16
An annular seal member 41 made of a flexible material such as rubber is provided at one end of a joint portion along the axial direction of the member.

The side of the cylinder tube 14 has
A pair of screw holes (not shown) are formed at predetermined intervals to mount a rail member 24 described later.

The sensor mounting mechanism 18 is formed by screwing a bolt member 20 having a hexagonal head into a screw hole (not shown) formed on the side surface of the cylinder tube 14 so as to be fixed on the side surface of the cylinder tube 14. A pair of legs 22a and 22b fixed at a distance and a predetermined distance from the side surface of the cylinder tube 14,
A rail member 24 mounted substantially parallel to the cylinder tube 14 via the 2a and 22b; and a holder 28a provided at an arbitrary position along the axial direction of the rail member 24 so as to be adjustable and holding a position detection sensor 26. And the holder 28
and a fixing bolt (fixing screw member) 30a for fixing the position a.

In this case, the legs 22a and 22b, the rail member 24, and the holder 28a are preferably formed of a synthetic resin material, a metal material such as an aluminum alloy or stainless steel.

As shown in FIGS. 5 and 6, the rail member 24 is formed in a substantially rectangular cross section, and the four corners of the outer surface thereof are chamfered to form a chamfer having a predetermined radius of curvature. 43.

As shown in FIG. 5, the fixing bolt 30a has a first threaded portion 32 and a thread engraved from a bolt head 31 formed at one end toward the other end. The non-fitting shaft portion (shaft portion) 34 that is not fitted to the female screw portion 58 of the boss portion 46a described later, and the second screw portion 36 are formed in this order, and the axial direction of the non-fitting shaft portion 34 Is formed so that the length (B) along the length is longer than the length (A) of the first screw portion 32 (B> A). In addition, fixing bolt 3
0a has a tapered portion 38 formed in a tapered shape at the other end.
is provided, and the holder 28a is fixed by the tapered portion 38a abutting on one side surface of the rail member 24. By making the other end of the fixing bolt 30a tapered, when the tapered portion 38a is brought into contact with one side surface of the rail member 24, it can be pressed more closely.

The diameter of the non-fitting shaft portion 34 is formed smaller than the diameter of the first screw portion 32 and the second screw portion 36 at the thread root, and the first screw portion 32 and the second screw portion 3 are formed.
6, a screw thread having the same diameter is formed.

The holder 28a is, as shown in FIG.
As shown in FIGS. 5 and 6, a sensor holding part 42 that is formed integrally with the cylinder tube 14 so as to protrude to the side close to the cylinder tube 14 and holds the position detection sensor 26, as shown in FIGS. A rail holding portion 44 that holds the rail member 24 so as to be displaceable along an axial direction of the rail member 24;
A substantially cylindrical boss portion 46a is formed at one end of the a and protrudes in a direction away from the cylinder tube 14, and a through screw hole (screw hole) 48 is formed substantially at the center of the boss portion 46a. .

As shown in FIGS. 3 and 4, the sensor holding portion 42 has a sensor mounting hole 40 having an arc-shaped cross section with one end closed and the other end open along the axial direction of the rail member 24. The sensor mounting hole 40 has a shape corresponding to the cross-sectional shape of the sensor mounting hole 40, and is held by being fitted with a position detection sensor 26 formed separately.

One end of the position detecting sensor 26 is formed in a planar shape so as to contact the closed wall surface of the sensor mounting hole 40, and a lead wire 50 is connected to the other end of the position detecting sensor 26. ing.

At a substantially intermediate portion of the position detecting sensor 26,
Indicator light 5 that emits light when the position of piston 19 is detected
2 (see FIG. 3) is provided on the upper surface of the sensor holder 42 so that the indicator light confirmation hole 54 can be visually recognized. The indicator light confirmation hole 54 is filled with a transparent or translucent resinous material.
The entry of liquid or the like from the indicator light confirmation hole 54 into the sensor mounting hole 40 of the sensor holding part 42 is prevented. After the position detection sensor 26 is inserted into the sensor mounting hole 40 of the sensor holding portion 42, the resin material is filled from the opening side of the sensor mounting hole 40, so that the position detection sensor 26 is inserted into the sensor mounting hole 40. While being firmly fixed, entry of a liquid or the like into the inside from the sensor mounting hole 40 is prevented.

As shown in FIG. 4, an appropriate clearance is provided between the sensor holding portion 42 and the side surface of the cylinder tube 14, and the position detection sensor 26 It is arranged in a non-contact state.

That is, when the position detecting sensor 26 is in contact with the outer surface of the cylinder tube 14, it becomes a cause of liquid accumulation, and when the drainage of the liquid attached to the outer surface of the cylinder tube 14 is taken into consideration, It is preferable that the detection sensor 26 be floated with a suitable clearance.

It is to be noted that a detection element (not shown) such as a Hall element or a magnetoresistive element is provided inside the position detection sensor 26, and a detection signal can be led out to an external device via a lead wire 50. it can.

As shown in FIGS. 5 and 6, the rail holding portion 44 is formed to have a substantially U-shaped cross section, and the rail member 24 is inserted into the inner peripheral surface so as to be displaceable in the axial direction. Are formed corresponding to the cross-sectional shape of the rail member 24,
It is formed slightly larger than the cross-sectional shape of the rail member 24. That is, by forming the shape of the inner peripheral surface of the rail holding portion 44 to be slightly larger than the cross-sectional shape of the rail member 24, the holder 28a can be smoothly displaced in the axial direction.

The claw portion 56 formed on the cylinder tube 14 side of the rail holding portion 44 holds the rail member 24 up to a substantially central portion in the width direction as shown in FIGS. . With this configuration, when the holder 28a is assembled to the rail member 24, the mounting of the rail holding portion 44 from above on the rail member 24 can be performed even more easily.

The boss portion 46a is formed outside of one side surface of the rail member 24, protrudes in a direction away from the cylinder tube 14, and has a predetermined angle (θ) in a direction away from the sensor holding portion 42. It is formed inclined. Further, the boss portion 46a can fix the taper portion 38a of the fixing bolt 30a by abutting against one side surface of the rail member 24 when the fixing bolt 30a screwed into the through screw hole 48 is tightened. Is set to the correct position.

As described above, the boss portion 46a is set at a predetermined angle (θ).
By forming the holder 28a to be inclined, the dimension (H1) in the height direction of the holder 28a can be suppressed.

As shown in FIG. 5, the through screw hole 48 is formed substantially at the center of the boss portion 46a, and the female screw portion 58 and the thread are not formed from one end into which the fixing bolt 30a is screwed. The non-fitting hole (through-hole) 60 is formed in this order, and the length (D) of the non-fitting hole 60 is
And the length (B) of the non-fitting shaft portion 34 of the fixing bolt 30a is longer than the length (C) of the female screw portion 58 of the through screw hole 48. (D> C, B> C).

That is, even when the first screw portion 32 of the fixing bolt 30a is displaced to the outside of the through screw hole 48, the second screw portion 36 of the fixing bolt 30a remains
8, the second screw portion 36 is not displaced from the non-fitting hole portion 60 toward the female screw portion 58,
The fixing bolt 30a does not come off.

The cylinder 10 to which the sensor mounting mechanism 18 according to the embodiment of the present invention is applied is basically constructed as described above. Next, the operation and effect of the cylinder 10 will be described. First, the assembly of the sensor mounting mechanism 18 will be described.

As shown in FIG. 5, the rail member 24 fixed to the cylinder tube 14 is held by the rail holding portion 44 of the holder 28a so that the position detection sensor 26 can be mounted in the axial direction of the cylinder tube 14. The holder 28a is displaced to the position.

Next, the fixing bolt 30a is inserted into the through screw hole 4
8, the taper portion 38a of the fixing bolt 30a is brought into contact with one side surface of the rail member 24 as shown in FIG. 6, so that the holder is pressed under the pressing action of the fixing bolt 30a. 28a is firmly fixed at a position along the rail member 24.

As described above, in the present embodiment, the cylinder 1
By deciding the position of the holder 28a along the rail member 24 mounted on the side surface of the holder 0 and tightening the fixing bolt 30a, the position detection sensor 26 held by the holder 28a can be easily positioned.

Further, the first screw portion 32 and the second screw portion 3 are provided at both ends via the non-fitting shaft portion 34 at the center of the fixing bolt 30a.
6 and the female screw portion 58 is formed in the through screw hole 48.
And the non-fitting hole portion 60, the second screw portion 36 is screwed with the female screw portion 58 when the fixing bolt 30a is loosened and the first screw portion 32 is displaced outside the through screw hole 48. Therefore, it is possible to prevent the fixing bolt 30a from being pulled out.

Further, the tapered portion 3 of the fixing bolt 30a
8a is brought into contact with one side surface of the rail member 24, so that a lateral and downward pressing force is applied to the rail member 24 under the pressing action by the axial force of the fixing bolt 30a. Can be more firmly fixed to the rail member 24.

The cylinder 10 to which the sensor mounting mechanism 18 assembled as described above is applied is connected to one pressure fluid inlet / outlet port 12a from a pressure fluid supply source (not shown) as shown in FIG. Air). The pressure fluid supplied to the one pressure fluid inlet / outlet port 12a is supplied to the one cylinder chamber 17 via a passage 27a.
a into the other cylinder chamber 17b.
Press towards.

When the piston 19 reaches the displacement end position under the action of the pressure fluid, the magnetic field of the magnet 39 mounted on the piston 19 is detected by a detection element (not shown) of the position detection sensor 26, and the position detection sensor 26 derives a detection signal to an external device such as a controller (not shown) via the lead wire 50.

Note that under the switching action of a switching valve (not shown),
By switching the supply of the pressure fluid from one pressure fluid in / out port 12a to the other pressure fluid in / out port 12b, the pressure fluid supplied to the pressure fluid in / out port 12b is introduced into the other cylinder chamber 17b through the passage 27b. Then, the piston 19 is displaced in the opposite direction and returns to the initial position. Thus, the piston 19 accommodated in the cylinder tube 14 can be reciprocated along the cylinder chamber 17.

The position detecting sensor 26 loosens the fixing bolt 30a provided on the holder 28a, and
Can be adjusted to a desired position along the axial direction of the rail member 24 (stroke direction of the cylinder 10). In this case, since the holder 28a is displaced along the rail member 24, the position adjustment range can be set large according to the length of the rail member 24.

When the sensor mounting mechanism 18 is not used, a screw hole formed on the side surface of the cylinder 10 may be closed by a closing means such as a bolt having a seal washer (not shown).

In this embodiment, the case where the position detection sensor 26 is attached to the cylinder 10 is described as an example. However, the present invention is not limited to this, and various fluid pressures such as a linear actuator (not shown) may be used. Of course, the present invention may be applied to equipment, electric actuators, and the like.

As described above, in the present embodiment, in the cylinder 10 provided with the position detection sensor 26 via the sensor mounting mechanism 18, it is difficult for liquids and the like to accumulate on the outer surface and the attached liquids and the like drop naturally. And the position detection sensor 26 and the rail member 2
By providing the fourth and the like at a distance from the outer surface of the cylinder tube 14, it is possible to prevent the propagation of various germs and avoid hygiene problems.

The position of the position detecting sensor 26 can be easily determined by determining the position of the holder 28a along the rail member 24 mounted on the side surface of the cylinder 10 and tightening the fixing bolt 30a.

Further, the height (H1) of the holder 28a in the height direction can be suppressed by forming the boss portion 46a at a predetermined angle (θ).

Further, even when the first screw part 32 of the fixing bolt 30a is displaced to the outside of the through screw hole 48, the second screw part 36 of the fixing bolt 30a is
8, the second screw portion 36 is not displaced from the non-fitting hole portion 60 toward the female screw portion 58,
The fixing bolt 30a does not come off.

Further, the tapered portion 3 of the fixing bolt 30a
8a is brought into contact with one side surface of the rail member 24, so that a lateral and downward pressing force is applied to the rail member 24 under the pressing action by the axial force of the fixing bolt 30a. Can be more firmly fixed to the rail member 24.

Next, a sensor mounting mechanism 100 according to another embodiment is shown in FIGS.

Sensor mounting mechanism 10 according to another embodiment
12, the screw portion 1 is attached to a fixing bolt (fixing screw member) 102 for fixing the position of the position detection sensor 26 with respect to the rail member 24, as shown in FIGS.
04, a bolt head 106 formed to protrude from one end of the screw portion 104, a non-fitting shaft portion (shaft portion) 108 formed at the other end side of the screw portion 104, A tapered portion 38b having a tapered tip is formed, and a through screw hole (screw hole) 1 formed substantially at the center of the boss 46b.
12, a female screw portion 114 and a concave portion (through hole) 116 having a diameter slightly larger than the diameter of the female screw portion 114 are formed, and a non-fitting shaft portion 108 of the fixing bolt 102 is formed.
Is formed larger than the diameter of the thread root of the screw portion 104.

That is, when the fixing bolt 102 is inserted and screwed from the concave portion 116 side close to the rail member 24, the screw portion 104 and the female screw portion 114 are screwed, and the non-fitting shaft portion 108 is By being locked to the part 114,
The screwing of the fixing bolt 102 is prevented. As a result, the fixing bolt 102 is prevented from being pulled out upward.

A bolt head 106 formed in a polygonal shape is formed at one end of the fixing bolt 102 with a diameter smaller than the diameter of the screw portion 104, and a tapered portion formed in a tapered shape at the other end. 38b are formed.

As shown in FIG. 12, the depth (E) of the concave portion 116 is equal to the length obtained by adding the height dimension of the non-fitting shaft portion 108 and the height dimension of the tapered portion 38b ( It is formed substantially equal to or deeper than F) (E ≧ F). That is, when the fixing bolt 102 is screwed upward, the non-fitting shaft portion 108 and the tapered portion 38b are stored in the concave portion 116, so that the fixing bolt 102 may protrude from the lower end surface of the boss portion 46b. Absent.

As shown in FIGS. 12 to 14, the boss 46b of the holder 28b is
4 (see FIG. 9) is formed in a substantially vertical shape in a direction away from it.

As described above, the boss 46b of the holder 28b
Is formed in a substantially vertical shape, the dimension (W2) in the width direction of the holder 28b can be suppressed.

The height (H2) of the holder 28b in the height direction can be suppressed by forming the boss portion 46b at a predetermined angle in a direction away from the sensor holding portion 42.

Sensor mounting mechanism 10 according to another embodiment
First, as shown in FIG. 12, first, as shown in FIG. 12, the fixing bolt 102 is inserted into the through screw hole 112 of the holder 28 b through the concave portion 116 below the bolt head 106.
Insert from the side and screw together.

Next, the fixing bolt 102 is screwed up and displaced upward to a position where the tapered portion 38b of the fixing bolt 102 is stored in the recess 116 formed in the holder 28b (see FIG. 13). When the female screw portion 114 of the through screw hole 112 and the non-fitting shaft portion 108 mesh with each other, the fixing bolt 102 is prevented from being displaced upward.

That is, since the fixing bolt 102 does not protrude from the lower end surface of the boss portion 46b, the rail member 24
Can be held by the rail holding portion 44.

Next, as shown in FIG.
8b, the rail member 24 fixed to the cylinder tube 14 is held by the rail holding portion 44.
The holder 28b is disposed at a position in the axial direction of the cylinder 10 where the mounting of the cylinder 6 is desired.

Next, as shown in FIG. 14, the fixing bolt 102 is tightened, and the tapered portion 38b of the fixing bolt 102 is brought into contact with one side surface of the rail member 24. Is fixed along the position.

As a result, the non-fitting shaft portion 108 and the female screw portion 114 do not come out of the fixing bolt 102 under the engagement action on one side, and the taper portion 38b
Is in contact with one side surface of the rail member 24 and does not come off.

The other functions and effects of the sensor mounting mechanism 100 are the same as those of the sensor mounting mechanism 18 shown in FIG. 1, and therefore detailed description thereof will be omitted.

Next, FIGS. 17 and 18 show a sensor mounting mechanism 150 according to still another embodiment.

Sensor mounting mechanism 15 according to another embodiment
0, as shown in FIG. 17 and FIG.
The first inclined portion 154 is formed on the upper surface of the second sensor holding portion 42 side, and the upper surface of the holder 152 adjacent to the first inclined portion 154 has a through screw hole (not shown) inclined at a predetermined angle approximately in the center. An inclined portion 156 is formed. A fixing bolt 30b is screwed into the through screw hole, and is provided so as to press one side surface of a rail member (not shown) under a tightening action of the fixing bolt 30b.

As described above, by providing the fixing bolt 30b at a predetermined angle, the size of the sensor mounting mechanism 150 in the height direction can be suppressed.

The first inclined portion 1 is provided on the upper surface of the holder 152.
Providing the first inclined portion 54 and the second inclined portion 156 prevents liquid or the like from being accumulated in the holder 152, and thus has an advantage that generation of various bacteria is prevented.

Next, a sensor mounting mechanism 200 according to still another embodiment is shown in FIGS.

In the sensor mounting mechanism 200 according to still another embodiment, as shown in FIGS. 19 and 20, the upper surface of the holder 202 is formed substantially parallel to the rail holding portion 44, and An inclined portion 204 inclined at a predetermined angle is formed on one end surface. The inclined portion 204
A through screw hole (not shown) inclined at a predetermined angle is formed at substantially the center of the hole. Fixing bolt 3 in the through screw hole
0c is screwed, and is provided so as to press one side surface of a rail member (not shown) under the tightening action of the fixing bolt 30c.

As described above, by forming the upper surface of the holder 202 substantially parallel to the rail holding portion 44, the holder 20
2 can be reduced in the height direction.

Further, since the upper surface of the holder 202 is formed in a planar shape, liquid and the like do not accumulate in the holder 202, so that there is an advantage that generation of various bacteria is prevented.

[0079]

According to the present invention, the following effects can be obtained.

That is, the position of the position detection sensor can be easily determined by determining the position of the holder along the rail member mounted on the cylinder tube and tightening the fixing bolt.

Further, the outer dimensions of the holder can be suppressed by forming the boss portion at a predetermined angle.

Further, the fixing bolt is prevented from coming off under the action of the retaining mechanism consisting of the fixing bolt and the screw hole.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a position detection sensor is attached to a side surface of a cylinder via a sensor mounting mechanism according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view taken along line II-II of FIG.

FIG. 3 is a top view of the sensor mounting mechanism according to the embodiment of the present invention.

FIG. 4 is a front view of the sensor mounting mechanism according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a state before fixing bolts are mounted on a holder of the sensor mounting mechanism according to the embodiment of the present invention.

FIG. 6 is a longitudinal sectional view taken along the line VI-VI in FIG. 3;

FIG. 7 is a partially omitted perspective view of the sensor mounting mechanism according to the embodiment of the present invention.

FIG. 8 is a side view of the sensor mounting mechanism according to the embodiment of the present invention.

FIG. 9 is a perspective view showing a state where a position detection sensor is attached to a side surface of a cylinder via a sensor mounting mechanism according to another embodiment of the present invention.

FIG. 10 is a top view of a sensor mounting mechanism according to another embodiment of the present invention.

FIG. 11 is a front view of a sensor mounting mechanism according to another embodiment of the present invention.

FIG. 12 is a longitudinal sectional view showing a state before fixing bolts are mounted on a holder of a sensor mounting mechanism according to another embodiment of the present invention.

FIG. 13 is a longitudinal sectional view showing a state where a fixing bolt is screwed into a holder of a sensor mounting mechanism according to another embodiment of the present invention and is displaced upward.

FIG. 14 is a longitudinal sectional view taken along the line XIV-XIV of FIG. 10;

FIG. 15 is a partially omitted perspective view of a sensor mounting mechanism according to another embodiment of the present invention.

FIG. 16 is a side view of a sensor mounting mechanism according to another embodiment of the present invention.

FIG. 17 is a perspective view of a sensor mounting mechanism according to still another embodiment of the present invention.

FIG. 18 is a side view of a sensor mounting mechanism according to still another embodiment of the present invention.

FIG. 19 is a perspective view of a sensor mounting mechanism according to still another embodiment of the present invention.

FIG. 20 is a side view of a sensor mounting mechanism according to still another embodiment of the present invention.

[Explanation of symbols]

10 ... cylinders 12a, 12b ...
Pressure fluid inlet / outlet port 14 ... Cylinder tube 15 ... Head cover 16 ... Rod cover 17, 17a, 1
7b ... cylinder chamber 18, 100, 150, 200 ... sensor mounting mechanism 19 ... piston 20 ... bolt member 21 ... piston rod 22a, 22b ...
Leg portion 24 Rail member 26 Position detection sensor 27a, 27b Passage 28a, 28b, 152, 202 Holder 30a-30c, 102 Fixing bolt 31, 106 Bolt head 32 First screw portion 34, 108 ... Non-fitting shaft part 36... Second threaded part 38 a, 38 b. Tapered part 39. Magnet 42. Sensor holding part 44. Rail holding part 46 a, 46 b. Boss part 48, 112. Reference numeral 60: non-fitting hole portion 104: screw portion 116: concave portion 154: first inclined portion 156: second inclined portion 204: inclined portion

Claims (6)

[Claims] 1. A mounting structure of a position detection sensor mounted outside a cylinder tube for detecting a position of a piston, wherein the position of the piston is detected by detecting a magnetic field of a magnet mounted on the piston. A position detecting sensor for detecting the position of the cylinder tube, a rail member mounted so as to be separated from the outer side surface of the cylinder tube by a predetermined distance, A boss provided on the holder and formed to protrude in a direction away from the cylinder tube, a screw hole formed through the boss, and a fixing screw member screwed into the screw hole. By pressing one end of the fixing screw member and pressing the rail member, the holder is moved in a predetermined direction along the axial direction of the rail member. Mounting structure of the position detection sensor, characterized in that fixed to the location. 2. The position detecting sensor mounting structure according to claim 1, further comprising a retaining mechanism for preventing the fixing screw member from being pulled out of the screw hole. Mounting structure. 3. The mounting structure for a position detection sensor according to claim 2, wherein the retaining mechanism includes a female screw portion formed at one end of the screw hole and a through hole formed at the other end of the screw hole. And a first screw part formed on one end side of the fixing screw member, a second screw part formed on the other end side, and the first screw part and the second screw part. A shaft portion that is formed between the female screw portions and that is not screwed with the female screw portion. An axial length of the shaft portion is formed to be longer than an axial length of the first screw portion, and an axial line of the through hole. A mounting structure for a position detection sensor, wherein the length in the direction is longer than the length in the axial direction of the female screw portion. 4. The mounting structure for a position detection sensor according to claim 1, wherein the boss is formed to be inclined at a predetermined angle in a direction away from the rail member. . 5. The mounting structure for a position detection sensor according to claim 2, wherein the retaining mechanism includes a female screw portion formed at one end of the screw hole and a through hole formed at the other end of the screw hole. And a shaft portion formed on one end side of the fixing screw member, and a screw portion formed on the other end side, wherein the fixing screw member is close to the rail member. A position detecting sensor which is screwed in from the side, and wherein the diameter of the shaft portion is formed to be larger than the diameter of the thread root of the screw portion, whereby the removal of the fixing screw member from the screw hole is prevented. Mounting structure. 6. The mounting structure for a position detection sensor according to claim 1, wherein one end of the fixing screw member is formed in a tapered shape.