JPH0214643Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a fluid pressure cylinder equipped with a position detector that operates in response to a permanent magnet provided on the piston and thereby detects the stroke position of the piston. In particular, the present invention relates to a structure for mounting a position detector to a cylinder.

(Prior art) When attaching a position detector to a fluid pressure cylinder, conventional methods have been to attach a mounting band to the outer peripheral surface of the cylinder body and attach the detector via this band, or to attach a mounting band to the cylinder body. The detector is attached via a tie rod for mounting the cylinder cover or a mounting bar attached to the cylinder body with screws, etc. for mounting the detector, but in either case, the position detector and the band, tie rod or mounting bar are It is necessary to interpose some intermediate mounting member such as a bracket between the two, and
Since screws and the like are required to attach the intermediate attachment member itself, the number of parts increases, making the attachment work extremely troublesome, and the appearance is also unsightly.

(Technical means for solving the problem) The present invention was made with the aim of solving the above-mentioned conventional problems. Two concave grooves are provided in parallel in the axial direction of the cylinder body, a convex wall for mounting a position sensor is formed between these concave grooves, and a fitting bulge is formed at the tip of this convex wall. On the other hand, the piston includes a body incorporating a detection means that operates in response to a permanent magnet provided on the piston, and a body extending integrally from one end of the body so as to form a substantially C-shaped cross section. A position detector is provided which includes a fitting groove between the body and a mounting piece forming the fitting groove. The fitting groove is fitted into the fitting bulge by bending the fitting groove, and a fixing screw screwed into the tip of the mounting piece is crimped onto the convex wall.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 3.

In these figures, A indicates a single-rod type small pneumatic cylinder, and B indicates a position detector attached to this cylinder A.

The pneumatic cylinder A has a cylinder body 1 made of aluminum alloy, into which a head cover 2 is integrally formed.
and a piston rod 4 having an aluminum alloy piston 3 at its tip and inserted into the cylinder body 1.
and a rod cover 5 attached to the open end of the cylinder body 1, and a ring-shaped permanent magnet 3a is attached to the side surface of the piston 3 on the rod side.

The cylinder body 1 has a short prismatic shape, and on its outer surface, two concave grooves 6, 6 are provided on opposite sides of the ridge, and two grooves 6, 6 are formed in parallel across the entire axial direction of the cylinder body. A convex wall 7 for mounting the position detector is formed between these two concave grooves 6, 6, and a fitting bulge 8 having an arcuate cross section is provided at the tip of the convex wall 7. is formed. The cylinder body 1 also has intake and exhaust ports 9a and 9 that communicate with the rod side chamber and the head side chamber, respectively.
b is bored, and a through-bolt insertion hole 1 for attaching the cylinder body 1 to a required location.
0 and 10 are provided through the shaft in the axial direction. The cylinder body 1 is integrally formed by extruding an aluminum alloy, for example.

The position detector B includes a hollow cylindrical body 11 having a substantially elliptical cross section and a required length, and a permanent magnet 3a that is fitted into the hollow part of the body 11 and attached to the piston 3. a reed switch 12 as a detection means that operates in response to the
A mounting piece 13 is formed to extend outward from one end of the body 11 in a curved manner so that its cross-sectional shape forms a C-shape together with the body 11, and a screw thread is attached to the tip of the mounting piece 13. It is composed of a fixing screw 14 inserted therein. The body 11 and the mounting piece 13 are integrally molded from a required synthetic resin and have appropriate elasticity. This mounting piece 13
is formed to have a length of approximately 1/3 of the total length of the body 11, and on the back side of the base of the mounting piece 13, there is a fitting bulge 8 having an arcuate cross section of the cylinder body 1. A fitting groove 15 having an arcuate cross section is formed along the longitudinal direction of the body 11 so that the fitting groove 15 can be tightly fitted. As is clear from FIG. 2, the circular arc that is the cross-sectional shape of the fitting bulge 8 is a so-called excellent arc whose length is longer than half of the total circumference.
Further, the circular arc of the fitting groove 15 is also a similar arc, and the fitting groove 15 can be fitted into the fitting bulge 8, and the body 11 can fit into the concave grooves 6, 6 of the cylinder body 1. On one side, the mounting piece 13 can be inserted into the concave groove 6 on the other side.

When installing the position detector B, the body 11 and the mounting piece 13 are straddled over the position detector mounting convex wall 7 of the cylinder body 1, and the base of the mounting piece 13 is attached to the upper surface of the body 11 and the mounting piece 13. By pressing from the side against the fitting bulge 8 of the protruding end of the convex wall 7, the body 11 and the mounting piece 13 are elastically deformed in the direction of widening the opening width of the fitting groove 15, and the fitting groove 15 is fitted. At the same time, the body 11 and the mounting piece 13 are fitted onto the convex wall 7 in a so-called snap type manner.
It ends up being inserted into the concave grooves 6, 6 on both sides of. In this state, the position detector B can slide against the convex wall 7 of the cylinder body 1 in its longitudinal direction, but can be moved away from the convex wall 7 by fitting the fitting groove 15 into the bulge 8. It won't come off. Therefore, after positioning the position detector B by appropriately sliding it on the convex wall 7, the fixing screw 14 is tightened to fix it. The fixing screw 14 is made of metal or synthetic resin, and is screwed into a screw hole 16 provided at the tip of the mounting piece 13. As shown in FIG. When the screw 14 is tightened until it is pressed against the outer surface of the screw 14, the tip of the screw 14 will bite into the convex wall 7 as shown in FIG. As a result, the position detector B is firmly fixed to the cylinder body 1.

A lead wire 12a is connected to the reed switch 12, so that required connections can be made. Moreover, the permanent magnet 3a
is attached to a support ring 18 that is fixed to the piston rod 4 via a fixing ring 17 while in contact with the side surface of the rod side of the piston 3, and the reed switch 12 is actuated by the magnetic force of this permanent magnet 3a. I'm starting to let them do it. Therefore, by attaching the position detector B at a required position on the cylinder body 1, the stroke position of the piston 3 can be detected.

In the figure, 19 indicates a split ring for fixing the rod cover in cylinder A, and 20 indicates a cushion ring.

In the above-mentioned embodiment, a convex wall for mounting a position detector is formed at one location on the cylinder body, that is, at one edge of the prismatic body, but if necessary, this convex wall may be 2 or more locations on the cylinder body,
For example, they may be formed at two or more ridge corners of a prismatic body, and a position detector may be attached to each convex wall. Furthermore, in the embodiment, one position detector is attached to one convex wall, but for example, two position detectors may be attached to this one convex wall in opposite directions. , multiple detectors may be installed. Further, in the embodiment, the cylinder body is made of a prismatic body, but the cylinder body can be formed of a cylindrical body or a polygonal column.

(Effects of the invention) According to the invention, two adjacent concave grooves are provided parallel to the axial direction of the cylinder body in a required part of the outer surface of the cylinder body, and a position sensor mounting hole is provided between these concave grooves. Since a convex wall is formed, there is no need for a special band or mounting bar to attach the detector, making it easy to install the detector.Moreover, the convex wall is formed by two concave grooves. Therefore, the material of the cylinder body can be used effectively, and the bulk and protrusion of the position detector attached to the outer surface of the cylinder body can be minimized. In addition, according to the present invention, the mounting piece is integrally formed on the position detector itself, eliminating the need for any intermediate mounting members such as brackets as in the past. All you have to do is fit it into the protrusion and tighten the fixing screw, so there are fewer parts compared to conventional ones, making the installation of the position detector very easy and quick, and it also looks good on the outside. becomes.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a fluid pressure cylinder with a position detector showing an embodiment of the present invention, Fig. 2 is a partially sectional side view of the same cylinder, and Fig. 3 is a partially sectional front view of the same cylinder. It is a diagram. A...Fluid pressure cylinder, B...Position detector, 1
... Cylinder body, 6 ... Concave groove, 7 ... Convex wall for mounting position detector, 8 ... Swelling part for fitting, 11
...Body of the detector, 12...Detection means (reed switch), 13...Mounting piece, 14...Fixing screw, 15...Fitting groove.

Claims (1)

[Scope of utility model registration request] Two adjacent concave grooves are provided parallel to each other in the axial direction of the cylinder body in a required portion of the outer surface of the cylinder body, and a convex wall for mounting a position sensor is formed between these concave grooves. A fitting bulge is formed at the tip of the piston, and a body has a built-in detecting means that operates in response to a permanent magnet provided on the piston, and the body has an approximately C-shaped cross section from one end thereof. and a mounting piece extending integrally so as to form a shape and having a fitting groove formed at the base thereof, the body of the position detector and the mounting piece being connected to the cylinder body. A position detector is provided by straddling the convex wall of the housing, fitting the fitting groove into the mating bulge, and crimping a fixing screw screwed into the tip of the mounting piece to the convex wall. Fluid pressure cylinder.