JP2001263309A - Fluid pressure cylinder with positioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid pressure cylinder with a positioner, which can be compacted and control with high precision. SOLUTION: A position detecting mechanism 3 comprises a movable portion composed of a guide rod 11 and a cam rod 12; and a fixed portion composed of a guide member 13, a cam follower portion 14, an exchange means 15, a cover 16 and an attaching block 17. The cam rod 12 extends at a predetermined angle to a reciprocating direction of a piston rod 5, and is disposed in a space between both of the guide rods 11. The cam rod 12, the guide member 13, the cam follower 14 and the exchange means 15 are enveloped by the cover 16. A positioner 4 is attached on an upper surface of a cover 16, and the positioner 4 and the position detecting mechanism 3 form one unit. The position detecting mechanism 3 is attached on a cylinder body 2 by an attaching block 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder with a positioner that detects a position of a rod of an air cylinder and feeds back the detection result to control the rod to a position corresponding to an input signal.

[0002]

2. Description of the Related Art Conventionally, the position of a rod in an air cylinder is detected, and the detection result is fed back to an air proportional valve that controls driving air for driving the air cylinder, thereby controlling the rod to a position corresponding to an input signal. There is an air cylinder with a positioner. Hereinafter, a conventional air cylinder with a positioner will be described with reference to FIG.

[0003] The air cylinder 51 includes a cylinder body 52.
, A rod 53, and a positioner 54. The rod 53 is supported by the cylinder main body 52 in such a manner that the rod 53 can reciprocate in a direction indicated by an arrow F in FIG. A connecting bar 55 is fixed to the end of the rod 53 so as to be parallel to the rod 53, and the bar 55 is interlocked with the reciprocating movement of the rod 53. Further, a pin 56 is fixed to the other end of the connecting bar 55.

[0004] The positioner 54 is attached to the cylinder body 52. A lever 57 is rotatably attached to the positioner 54. A linear groove 58 is provided at the free end of the lever 57, and the pin 56 is loosely fitted in the linear groove 58.

For this reason, the lever 57 is rotated with the reciprocation of the rod 53, and the position of the rod 53 is converted into a rotation angle. That is, when the rod 53 is protruding, the lever 57 is at the position shown by the solid line and the broken line in the figure, and when the rod 53 is immersed, it is at the position shown by the two-dot chain line in the figure. Therefore, the lever 57 rotates about the center 59 between these positions.

The positioner 54 calculates the current position of the rod 53 based on the rotation angle of the lever 57, and moves the rod 53 to a position corresponding to the input signal.

[0007]

However, in the air cylinder 51 with the positioner, the space occupied by the position detecting portion (the connecting bar 55 and the lever 57) of the rod 53 is large, and the space protrudes greatly in the width direction of the cylinder body 52. It is necessary to dispose the positioner 54 in a state in which the positioner 54 is placed. For this reason, the cylinder 51 itself becomes large, and a wide mounting space is required.

The rod 53 may be distorted when protruding due to its own weight, dimensional error, or the like. In particular, since the lever 57 is long, the angle change amount of the lever 57 with respect to the change amount of the rod 53 is small. For this reason, it was difficult to perform highly accurate positioning of the rod 53.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluid pressure cylinder with a positioner, which can be made compact and can perform high-precision control.

[0010]

In order to solve the above problems, according to the first aspect of the present invention, a cylinder body, a piston rod reciprocally movable by fluid pressure in the cylinder body, and the piston rod A position detection mechanism that detects a position as a rotation angle, and a positioner-equipped hydraulic cylinder including a positioner that controls the piston rod at a predetermined position based on the detected rotation angle, wherein the position detection mechanism, together with the piston rod A movable portion that reciprocates, and a fixed portion fixed to a positioner, wherein the movable portion has a guide rod extending parallel to a reciprocating direction of the piston rod, and a predetermined portion with respect to a reciprocating direction of the piston rod. A cam rod extending at an angle, wherein the fixed portion guides the guide rod, A conversion unit that converts the position of the cam follower unit that moves in accordance with the rotation angle into a rotation angle and transmits the rotation angle to the positioner, and supports the guide member, and accommodates the guide member, the cam rod and the cam follower unit, The gist of the present invention is to provide an attaching means for detachably attaching the container to the attached portion.

According to a second aspect of the present invention, in the hydraulic cylinder with the positioner according to the first aspect, the pair of guide members are spaced apart from each other and arranged in parallel.
The gist is that the cam rod is disposed so as to pass through a space formed therebetween.

According to a third aspect of the present invention, in the hydraulic cylinder with a positioner according to the first or second aspect, the position detecting mechanism is provided on an outer peripheral surface of the cylinder main body, and a width of the housing body is provided. The gist is that the width is set to be equal to or less than the width of the larger one of the cylinder body and the positioner.

Hereinafter, the "action" of the present invention will be described. According to the first to third aspects of the present invention, the cam follower is driven by the cam follower using the cam rod arranged at a predetermined angle with respect to the reciprocating direction of the piston rod. Then, a change in the position of the cam follower portion caused by the reciprocating motion of the piston rod is converted into a rotation angle by the conversion means, and the rotation angle is transmitted to the positioner. For this reason, the space occupied by the position detecting mechanism is reduced, and the positioner and the position detecting mechanism can be arranged on the outer peripheral surface of the cylinder body. Therefore, the hydraulic cylinder with the positioner itself becomes compact.

Further, the guide rod is guided by a guide member. In other words, the movable part is guided by the fixed part. Therefore, generation of rattling between the movable part and the fixed part is suppressed. That is, the distortion of the piston rod is regulated by the fixing portion. For this reason, highly accurate position control of the piston rod is possible.

Moreover, since the positioner is fixed to the position detecting mechanism, rattling between the two is suppressed. Therefore, the positioner and the position detection mechanism can be easily aligned, and a highly accurate hydraulic cylinder with a positioner can be realized by an easy assembling operation.

According to the second aspect of the present invention, the pair of guide members are arranged in parallel with a distance from each other, and the cam rod is disposed so as to pass through a space formed therebetween. For this reason, even if an external force is applied to the piston rod or the movable part, rattling is unlikely to occur between the fixed part and the movable part. Therefore, highly accurate control of the piston rod is possible.

According to the third aspect of the present invention, the position detecting mechanism is provided on the outer peripheral surface of the cylinder body. The width of the container is set to be equal to or smaller than the width of the larger one of the cylinder body and the positioner. For this reason, the whole hydraulic cylinder with a positioner can be made compact.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in an air cylinder with a positioner will be described in detail with reference to FIGS.

As shown in FIGS. 1 to 3, an air cylinder 1 with a positioner includes a cylinder body 2, a position detecting mechanism 3 and a positioner 4. Cylinder body 2
Are a plurality of (four in the present embodiment)
1), and a piston rod 5 that reciprocates in connection with a piston 5a housed in the main body 2.

The positioner 4 has a rotatable input shaft 4a, and performs feedback control by detecting the position of the piston rod 5 from the rotation angle of the input shaft 4a.
The position detecting mechanism 3 is provided at an upper portion of the cylinder body 2 (FIG. 1B).
Above). This position detection mechanism 3
Is a movable part including a pair of guide rods 11 and a cam rod 12, a pair of guide members 13, a cam follower part 14,
It is composed of a conversion unit 15, a cover 16, and a fixing unit including a mounting block 17 as a mounting unit.

The two guide rods 11 are formed by rods having a circular cross section. These guide rods 11
Extend in parallel with the reciprocating direction of the piston rod 5 and are spaced apart and arranged in parallel. Cam rod 12
Is formed by a rod having a circular cross section. The cam rod 12 extends at a predetermined angle to the reciprocating direction of the piston rod 5 and is disposed in a space formed between the two guide rods 11. Both ends of the guide rod 11 and the cam rod 12 are fixed to the connection member 6. This connecting member 6 is fixed to the piston rod 5 via a connecting member 7. For this reason, both the guide rods 11 and the cam rod 12 can reciprocate together with the piston rod 5.

Each of the guide members 13 is formed of, for example, a slide bearing and supports the guide rod 11. That is, the guide rod 11 is guided by the guide member 13. These guide members 13 are arranged to face each other. This allows
The guide rod 11 reciprocates while sliding on the guide member 13. For this reason, rattling of the guide rod 11 is prevented by the guide member 13, and the arrow F in FIG.
The rattling of the piston rod 5 in the directions indicated by 1 and F2 is prevented.

These guide members 13 are attached to a cover 16 as a container. That is, both guide members 13 are supported by the cover 16. As shown in FIG. 3, the cover 16 has a substantially “U” -shaped cross section.
Both guide members 13 are attached to the inner surface of the cover 16. The cover 16 is open in the direction in which the guide rod 11 extends. For this reason, a part of the guide rod 11, a part of the cam rod 12, and the guide member 13 are
6. Then, the guide rod 11 and the cam rod 12 reciprocate while passing through the cover 16. In addition, as shown in FIG.
The width of 6 is set substantially equal to the width of the positioner 4.

Also, as shown in FIGS.
A positioner 4 is attached to the upper surface of 6. That is, the positioner 4 is fixed to the position detection mechanism 3, and the positioner 4 and the position detection mechanism 3 form one unit. As shown in FIGS. 1 (a) and 2 (a), the cover 16 is provided with a notch 16a, and when the positioner 4 is fixed, the cam follower 14 and the conversion means 15 are notch 16a. It is located within. Further, the cam follower unit 14 and the conversion unit 15
Are located in a region sandwiched between the guide members 13. For this reason, both sides of the cam follower part 14 and the conversion means 15 are in a state of being surrounded by the cover 16.

The conversion means 15 comprises a rotating lever 18 and an arm 19. The rotation lever 18 is formed of a plate-like material, and its base end is located at the input shaft 4 a of the positioner 4.
It is connected to the. An arm 19 is rotatably attached to the tip of the rotating lever 18 via a connecting pin 20. The arm 19 has a cylindrical shape.
9, a roller-shaped cam follower portion 14 is rotatably connected. The rotating lever 18 is urged in the direction indicated by the arrow F3 in FIG. 4 so that the peripheral surface of the cam follower portion 14 always comes into sliding contact with the peripheral surface of the cam rod 12. As shown in the figure, the cam follower portion 14 is connected such that its rotation axis is located on a line connecting the center of the arm 19 and the axis of the connection pin 20. The diameter of the cam follower portion 14 is set so that the length L1 from the contact point between the cam follower portion 14 and the cam bar 12 to the axis of the connecting pin 20 is equal to the radius R1 of the cam bar 12.
Thereby, the axis of the connecting pin 20 is always located on the center line of the cam rod 12.

By the way, as shown in FIG.
Below the two mounting blocks 17 via the base 21.
Has been fixed. Each mounting block 17 is detachably mounted on the tie rod 2a of the cylinder body 2. Thus, the position detecting mechanism 3 is fixed to the cylinder body 2, and the position detecting mechanism 3 and the positioner 4 are in a state of being assembled on the upper part of the cylinder body 2.
Further, the position detection mechanism 3 is in a state disposed between the cylinder body 2 and the positioner 4.

In the air cylinder 1 with the positioner thus constructed, the piston rod 5 reciprocates by the driving air supplied into the cylinder body 2. That is, the piston rod 5 is immersed in the cylinder body 2 as shown in FIG. 1 or moves so as to project from the cylinder body 2 as shown in FIG.

When the piston rod 5 is immersed in the cylinder body 2, the cam follower portion 14 slides in the vicinity of the end of the cam rod 12 on the connecting member 7 side, as shown in FIG. Therefore, the positional relationship between the movable part and the fixed part of the position detection mechanism 3 is as shown in FIGS. 1, 4A and 5A. In the state where the piston rod 5 protrudes from the cylinder body 2, FIG.
As shown in FIG. 7, the cam follower portion 14 slides near the opposite end of the cam rod 12. Therefore, the position detection mechanism 3
The positional relationship between the movable part and the fixed part is as shown in FIGS. 2, 4B and 5C. The cam follower section 14 slides along the cam rod 12 as the piston rod 5 reciprocates. As a result, the cam follower unit 14
Moves in the direction indicated by the arrow T in FIG. 4B, and the rotating lever 18 rotates about the input shaft 4a. That is, the position of the piston rod 5 is converted into a rotation angle and the positioner 4
Is input to The positioner 4 calculates the position of the piston rod 5 from the rotation angle and controls the amount of drive air supplied into the cylinder body 2 to stop the piston rod 5 at a predetermined position.

A reference position is set on the input shaft 4a of the positioner 4. And the positioner 4
When the input shaft 4a rotates, the position of the piston rod 5 is calculated based on the rotation angle from the reference position. This reference position is set at a position where a line connecting the center of the input shaft 4a and the center of the connecting pin 20 is parallel to the direction in which the guide rod 11 extends, as shown in FIG. 5B. Further, the sliding position of the cam follower portion 14 and the cam rod 12 at this time is set so as to be a position that is just half of the maximum stroke amount of the piston rod 5. That is, the piston rod 5 can protrude and retract from this position by the same amount.

Therefore, according to the present embodiment, the following effects can be obtained. (1) The cam rod 12 is disposed at a predetermined angle to the reciprocating direction of the piston rod 5. When the cam follower 14 is driven by the cam bar 12, a change in the position of the cam follower 14 is converted into a rotation angle by the arm 19 and the rotation lever 18, and the rotation angle is input to the positioner 4. For this reason, the position detection mechanism 3 can be configured to be small, and
The exclusive space of the mechanism 3 can be reduced. Moreover, the positioner 4 and the position detecting mechanism 3 are connected to the cylinder body 2.
Can be arranged at the top of Thus, the positioner-equipped air cylinder 1 itself can be made compact.

Further, the guide rod 11 is used for the guide member 1.
3 to guide you. In other words,
The movable portion of the position detecting mechanism 3 is guided by a fixed portion. Therefore, it is possible to prevent rattling between the movable part and the fixed part. That is,
The distortion of the piston rod 5 is regulated by the fixing part.
For this reason, highly accurate position control of the piston rod 5 becomes possible.

(2) The positioner 4 is fixed to the cover 16. That is, the positioner 4 is fixed to the position detecting mechanism 3, and the two constitute one unit. Therefore, by assembling this unit,
The rattling between the positioner 4 and the position detecting mechanism 3 can be prevented. Moreover, the positioner 4 is covered with the cover 16.
, The positioner 4 can be fixed to the position detection mechanism 3 in a stable state. Therefore,
Positioning between the positioner 4 and the position detecting mechanism 3 can be easily performed, and an air cylinder 1 with a positioner with high accuracy can be realized by an easy assembling operation.

(3) A pair of guide rods 11 are used, and the guide rods 11 are arranged side by side while being separated from each other. The cam rod 12 is disposed in a space formed between the two guide rods 11. For this reason, even if an external force is applied to the movable part of the piston rod 5 or the position detecting mechanism 3, rattling is unlikely to occur between the fixed part and the movable part.
Therefore, the piston rod 5 can be controlled with high accuracy.

In particular, in this embodiment, each guide member 13
The cam follower portion 14 is located in a region sandwiched between the two. For this reason, even if an external force is applied to the movable parts of the piston rod 5 and the position detecting mechanism 3, the position of the cam follower part 14 is not easily shifted. Therefore, positioner 4
Can be reduced, and the piston rod 5 can be controlled with higher accuracy.

(4) The position detecting mechanism 3 includes the cylinder body 2
It is installed on the outer peripheral surface of. The width of the cover 16 is set substantially equal to the width of the positioner 4. That is, the position detecting mechanism 3 does not protrude from the positioner 4. For this reason, the whole air cylinder 1 with a positioner can be made compact.

(5) Part of the guide rod 11, the cam rod 1
2, a guide member 13, a cam follower portion 14, and both sides of the conversion means 15 are surrounded by covers 16. In other words, each of those members is protected by the cover 16. For this reason, external force is not applied to each of these members, dust and the like are unlikely to adhere to the members, and the piston rod 5
Incorrect detection of the position can be prevented.

By using the cover 16, the appearance can be refreshed and the design can be improved. (6) An arm 19 is rotatably attached to the tip of the rotating lever 18 via a connecting pin 20. The cam follower 14 is attached to the arm 19.
Thereby, the axis of the connecting pin 20 is always positioned on the center line of the cam bar. For this reason, as shown in FIG. 5, regardless of whether the rotation lever 18 is rotated in the direction of arrow A or in the direction of arrow B from the reference position (the position shown in FIG. The moving distances of the parts become equal. For example, as shown in FIG. 5A, the moving distance of the movable part when the rotating lever 18 rotates from the reference position by the angle θ in the direction of arrow A is defined as a distance La. Also,
As shown in FIG. 5C, the moving distance of the movable part when the rotating lever 18 is rotated from the reference position by the angle θ in the direction of arrow B is defined as a distance Lb. Then, the distance La and the distance Lb become equal. Therefore, in the present embodiment, the amount of protrusion of the piston rod 5 can be detected by the positioner 4 with high accuracy.

Incidentally, as shown in FIG. 6, when the cam follower portion 14 is directly attached to the tip of the rotary lever 18, even if the rotary lever 18 rotates by the same angle θ in the directions of arrows A and B, The moving distances La and Lb of the movable part are not equal. Therefore, in this case, the amount of protrusion of the piston rod 5 cannot be detected by the positioner 4 with high accuracy.

(7) The cam rod 12 has a circular cross section. For this reason, the connecting member 6 is rotated in a state where the cam rod 12 is twisted.
The cam follower portion 1 with respect to the cam rod 12
The sliding locus of No. 4 is linear. Therefore, even if the cam rod 12 is fixed to the connecting member 6 in a twisted state, the reciprocating motion of the piston rod 5 can be converted into a rotation angle with high accuracy. That is, the detection accuracy of the positioner 4 can be kept high.

The embodiment of the present invention may be modified as follows. In the above embodiment, the cam rod 12 having a circular cross section is used. However, the cam rod 12 may have a shape other than a circular cross section, such as a polygonal cross section or an elliptical cross section.

The cam follower 14 and the conversion means 15
Is not limited to a position within a region sandwiched between the guide members 13 and may be arranged at any position. For example, each guide member 13 may be arranged near the right opening end of the cover 16 in FIG.

In the above embodiment, the arm 19 is interposed between the rotary lever 18 and the cam follower portion 14. However, the arm 19 may be omitted. In this way, the number of components of the position detection mechanism 3 can be reduced. In this case, it is desirable to set the diameter of the cam follower portion 14 as small as possible.

In the above embodiment, the position detecting mechanism 3 is not limited to the cylinder body 2 but may be fixed to a peripheral wall or a fixed portion of the cylinder body 2. In the above embodiment, the position detection mechanism 3 is located between the cylinder body 2 and the positioner 4. However, the position detection mechanism 3 may be arranged at the top of the air cylinder 1. That is, the positioner 4 may be arranged between the cylinder body 2 and the position detection mechanism 3.

In the above embodiment, a slide bearing is used as the guide member 13. However, the guide member 13 may be changed to another type of bearing or a roller that can slide with the guide rod 11.

In the above embodiment, the guide rod 11
The cam rod 12 is in a state where only a part thereof is surrounded by the cover 16. However, the entirety of the guide rod 11 and the cam rod 12 may be surrounded by the cover 16.

The hydraulic cylinder with a positioner is not limited to the air cylinder 1 but may be any hydraulic cylinder or any other cylinder driven by hydraulic pressure.

Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiment will be listed below. (1) In the hydraulic cylinder with a positioner according to claim 2 or 3, the cam follower portion and the conversion means are located in a region sandwiched between the guide members. According to the invention described in the technical idea (1), the positioner detection error can be further reduced.

(2) Claims 1 to 3, Technical idea (1)
In the hydraulic cylinder with a positioner according to any one of the above, the cam rod has a circular cross section. According to the invention described in the technical idea (2), the positioner detection accuracy can be kept high.

(3) In the hydraulic cylinder with a positioner according to any one of the first to third aspects and the technical ideas (1) and (2), the conversion means has a base end having an input shaft of the positioner. The cam follower portion is attached to the arm, the arm is rotatably attached to the tip of the rotating lever, the cam follower portion is attached to the arm,
The rotation axis of the arm in a state of sliding contact between the cam follower and the cam bar is set so as to be located on the center line of the cam bar. This technical idea (3)
According to the invention described in (1), the protrusion amount of the piston rod can be detected with high accuracy by the positioner.

(4) A hydraulic cylinder having a position detecting mechanism for detecting the position of the piston rod of the hydraulic cylinder as a rotation angle, and a positioner for controlling the piston rod at a predetermined position based on the detected rotation angle. In a positioner with a position detection mechanism, the position detection mechanism includes a movable portion that reciprocates with the piston rod, and a fixed portion fixed to the positioner, wherein the movable portion is parallel to a reciprocating direction of the piston rod. An extending guide rod, and a cam rod extending at a predetermined angle with respect to the reciprocating direction of the piston rod, wherein the fixing portion follows a guide member for guiding the guide rod and the cam rod. Converting means for converting the position of the moving cam follower into a rotation angle and transmitting the rotation to the positioner; and supporting the guide member. And a housing surrounding the guide member, the cam rod, and the cam follower, and mounting means for removably mounting the housing on the mounting portion.

(5) In a position detecting mechanism of a hydraulic cylinder for detecting the position of a piston rod of a hydraulic cylinder as a rotation angle and outputting the detection result to a positioner, a movable portion reciprocating with the piston rod;
A fixed portion fixed to a positioner, wherein the movable portion includes a guide rod extending parallel to a reciprocating direction of the piston rod, and a cam rod extending at a predetermined angle with respect to the reciprocating direction of the piston rod. The fixing unit includes a guide member for guiding the guide rod, a conversion unit that converts a position of a cam follower unit that moves following the cam rod into a rotation angle and transmits the rotation angle to a positioner, and the guide member. A supporting member for supporting and enclosing the guide member, the cam rod, and the cam follower portion; and mounting means for detachably mounting the storing member to the mounting portion.

[0052]

As described in detail above, according to the first to third aspects of the present invention, compactness can be achieved and highly accurate control can be performed.

According to the second aspect of the present invention, the piston rod can be controlled with high accuracy.

[Brief description of the drawings]

FIG. 1A is a schematic plan view showing an embodiment in which the present invention is embodied in an air cylinder with a positioner, and FIG. 1B is a front view of FIG.

2A is a schematic plan view showing an embodiment in which the present invention is embodied in an air cylinder with a positioner, and FIG. 2B is a front view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIGS. 4A and 4B are partial plan views showing the conversion means of the embodiment in an enlarged manner.

FIGS. 5A to 5C are partial plan views showing a correlation between a rotation angle of a rotary lever and a moving distance of a movable unit in the embodiment.

FIGS. 6A to 6C are partial plan views schematically showing a comparative example.

FIG. 7 is a plan view showing a conventional air cylinder with a positioner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air cylinder as a hydraulic cylinder with a positioner, 2 ... Cylinder main body, 3 ... Position detection mechanism, 4 ... Positioner, 5 ... Piston rod, 11 ... Guide rod, 12
... Cam rod, 13 ... Guide member, 14 ... Cam follower part,
15 ... conversion means, 16 ... cover as a container, 17 ...
Mounting block as mounting means.

Claims (3)

[Claims] 1. A cylinder body, a piston rod reciprocally movable by fluid pressure in the cylinder body, a position detection mechanism for detecting a position of the piston rod as a rotation angle, and a predetermined position based on the detected rotation angle. Wherein the position detection mechanism includes a movable part that reciprocates with the piston rod, and a fixed part that is fixed to the positioner, wherein the movable part A guide rod extending in parallel with the reciprocating direction of the piston rod, and a cam rod extending at a predetermined angle with respect to the reciprocating direction of the piston rod, wherein the fixing portion guides the guide rod. The position of the guide member and the cam follower that moves following the cam rod is converted into a rotation angle, and And a housing for supporting the guide member, surrounding the guide member, the cam rod, and the cam follower portion, and an attachment for detachably attaching the accommodation body to the attached portion. And a fluid pressure cylinder with a positioner. 2. The apparatus according to claim 1, wherein said pair of guide members are arranged in parallel with a distance from each other, and said cam bar is arranged so as to pass through a space formed therebetween.
2. A fluid pressure cylinder with a positioner according to item 1. 3. The position detecting mechanism is installed on an outer peripheral surface of the cylinder body, and a width of the housing is set to be smaller than a width of a larger one of the cylinder body and the positioner. The fluid pressure cylinder with a positioner according to claim 1 or claim 2.