JP5118708B2 - Fluid pressure cylinder - Google Patents

Description

  The present invention relates to a fluid pressure cylinder in which a rod reciprocates by fluid pressure.

  There is a fluid pressure cylinder as a reciprocating actuator operated by air pressure or hydraulic pressure. The fluid pressure cylinder includes a cylinder body in which a cylinder chamber is formed, a piston that is reciprocally movable in the cylinder chamber and that divides into a forward fluid pressure chamber and a backward fluid pressure chamber, A piston rod fixed to the end face of the piston and projecting to the outside of the cylinder.

  By supplying fluid pressure to one of the two fluid pressure chambers and opening the other fluid pressure chamber to the atmosphere, the piston and piston rod are pushed and moved to the other side, The position where the piston comes into contact with the cover or stopper provided at the end of the cylinder body and the movement is stopped becomes the forward stroke end position or the backward stroke end position.

  Normally, when a fluid pressure cylinder is used in a mass-production product manufacturing apparatus for moving a jig or a workpiece, the cylinder body is fixed to the manufacturing apparatus. It is necessary to stop the piston rod at the forward stroke end position, the backward stroke end position of the piston rod, or at any intermediate position between them.

In this case, a mechanism that can be installed in a narrow space without installing an adjustment member that is long in the axial direction, and the stroke end position and the length of the piston rod protrusion can be adjusted from the outside of the cylinder to facilitate adjustment. Has been proposed. For example, in Patent Document 1, a rod cover and a head cover that respectively cover the opening end of a cylinder body are screwed to female threads formed on the inner surface of the cylinder body, and the reciprocating ends of the pistons are rotated by rotating the respective covers. There has been proposed a fluid pressure cylinder stroke adjusting mechanism in which the position of the cylinder is changed. Also, in Patent Document 2, a cylindrical stopper is mounted in the end of the cylinder body so as to be movable in the axial direction, and a rod cover or head cover that is rotatably incorporated in the end of the cylinder body and the stopper are screwed together. A fluid pressure cylinder is described in which the position of the stroke end of the piston rod is changed by the rotation of the rod cover or the head cover. Furthermore, Patent Document 3 discloses a fluid in which a cylindrical stopper is screwed into the end of the cylinder body, and the stopper is rotated by a cover provided outside the cylinder body to change the axial position of the stopper. A pressure cylinder is described.
Japanese Utility Model Publication No. 5-42717 Japanese Utility Model Publication No.7-1304 JP 2004-176888 A

  As described in Patent Document 1, when adjusting the position of the stroke end of the piston rod by rotating the rod cover or the head cover formed with the supply / discharge port with respect to the cylinder body, the position of the stroke end is adjusted. Therefore, when the rod cover or the head cover is rotated, the direction of the supply / discharge port may change, and the fluid supply hose connected to the supply / discharge port may move. For this reason, it is not easy to adjust the stroke end with the fluid supply hose attached.

  As described in Patent Document 2, when a rod cover or a head cover is incorporated into the end of the cylinder body, the cylinder body is moved when adjusting the position of the stroke end of the piston rod by moving the stopper in the axial direction. It is necessary to rotate the cover by inserting the tool from the adjustment groove formed by cutting and engaging the tool with the adjustment hole formed in the cover, and it is difficult to adjust the stroke.

  As described in Patent Document 3, if the cover provided on the end face of the cylinder body is rotated to move the stopper in the axial direction, the cylinder cannot be attached at the cover portion.

  An object of the present invention is to make it possible to easily adjust the position of the stroke end of the piston rod.

  Another object of the present invention is to enable a fluid pressure cylinder to be attached to a member such as a device or a jig at a rod cover or a head cover.

The fluid pressure cylinder according to the present invention includes a cylinder body having a cover at both ends and a cylinder chamber formed therein, a piston that is reciprocably mounted in the cylinder chamber, and that defines a fluid chamber on both sides, and the cylinder body A shaft member having a piston rod that penetrates at least one cover from the shaft and protrudes in the axial direction to the outside, and a male screw that is screwed to a female screw formed on the inner peripheral surface of the end of the cylinder body is formed on the outer peripheral surface. And a movable stopper that changes the position of the stroke end of the shaft member by moving in the axial direction with rotation and changing the position of the stroke end of the shaft member, and the cylinder main body positioned between the movable stopper and the cover the rotatably mounted therein, and a driven gear for rotating the movable stopper, rotatably in the cylinder body around a parallel rotary shaft to the driven gear Provided part, the meshes the driven gear and a drive gear for rotating the driven gear, wherein by changing the axial position of the O Ri said movable stopper to rotate the driven gear by the drive gear shaft The stroke end position of the member is adjusted.

Fluid pressure cylinder of the present invention is provided with a rotation transmission pin sliding are freely fitted in a fitting hole formed in the movable stopper to the driven gear, the rotation of the driven gear via the rotation transmitting pin It characterized that you transmitted to the movable stopper.

The fluid pressure cylinder of the present invention is characterized in that the outer peripheral portion of the drive gear is pushed outward from the outer peripheral surface of the cylinder body.

The fluid pressure cylinder of the present invention is characterized in that a rotation restricting member for restricting the rotation of the driven gear is provided in the cylinder body.

The fluid pressure cylinder of the present invention is characterized in that the drive gear is rotatably mounted on the cover.

The fluid pressure cylinder of the present invention is characterized in that the drive gear is positioned at the center in the width direction of the cylinder and is rotatably mounted on the cover.

In the fluid pressure cylinder according to the present invention, the movable stoppers are respectively attached to both ends of the cylinder body, and the axial positions of the movable stoppers are changed by the drive gears provided in the cylinder body, respectively. The position of both stroke ends of the reciprocation of the member is adjusted.

  The fluid pressure cylinder of the present invention is characterized in that the shaft member is provided with a piston rod protruding in the axial direction from both ends of the cylinder body.

According to the present invention, rotated by a driving gear provided in the driven gear for rotating the movable stopper to change the position of the stroke end is located inside the cover to the cylinder body, change the axial position of the movable stopper by a drive gear Since the stroke end position of the shaft member is adjusted, there is no need to move or rotate the cover when adjusting the stroke end position. Thereby, it is possible to attach the device and the member to the cover surface of the fluid pressure cylinder.

The driven gear is rotated transmitting pin is provided which is slidably fitted in the fitting hole formed in the movable stopper to rotate the driven gear rotates the driven gear through the rotation transmission pin by the drive gear Thus, the rotation of the movable stopper is smoothly transmitted, and the movable stopper can be easily moved in the axial direction by the drive gear .

The outer peripheral portion of the drive gear protrudes outward from the outer peripheral surface of the cylinder body, and the operator can easily perform the rotational drive operation of the drive gear .

The fluid pressure cylinder is applied to both a single rod type in which a piston rod protrudes from one end of a cylinder body and a double rod type in which a piston rod protrudes from both ends of the cylinder body. In addition, the stroke end of the piston rod that can be adjusted is different from the case where the stroke end in the direction in which the piston rod protrudes from the cylinder end, the stroke end in the direction in which the piston rod retreats, and both of these stroke ends are changed. However, the present invention can be applied.

It is a perspective view of the fluid pressure cylinder which is one embodiment of the present invention. It is a rear view of the arrow 2 direction in FIG. It is a side view of the arrow 3 direction in FIG. (A), (B) is each 4-4 sectional view taken on the line in FIG. FIGS. 5A and 5B are cross-sectional views taken along line 5-5 in FIG. (A) is an expanded sectional view of the 6A section in Drawing 4 (A), and (B) is an expanded sectional view of the 6B section in Drawing 5 (A). It is sectional drawing of the fluid pressure cylinder which is other embodiment of this invention. It is sectional drawing of the fluid pressure cylinder which is other embodiment of this invention. It is sectional drawing of the fluid pressure cylinder which is other embodiment of this invention. It is sectional drawing of the fluid pressure cylinder which is other embodiment of this invention. (A), (B) is sectional drawing of the fluid pressure cylinder which is other embodiment of this invention. 12 is a cross-sectional view taken along line 12-12 in FIG. FIG. 13 is a sectional view taken along line 13-13 in FIG. It is sectional drawing of the fluid pressure cylinder which is other embodiment of this invention. FIG. 15 is a sectional view taken along line 15-15 in FIG. 14.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure which shows embodiment, the same code | symbol is attached | subjected to the common member.

As shown in FIG. 1, a fluid pressure cylinder 10a has a cylinder body 11 of substantially straight rectangular parallelepiped which cross sectional shape is nearly square, as shown in FIG. 4, a cylinder formed in the cylinder body 11 A piston 13 is mounted in the hole 12 so as to be capable of reciprocating in the axial direction. The piston 13 has a piston main body 13a provided with a seal material that is in sliding contact with the inner peripheral surface of the cylinder hole 12, and a retainer 13c to which a magnet 13b is fitted. As shown in FIG. 4, covers 14 and 15 are attached to both ends of the cylinder body 11, and a cylinder chamber 16 is formed inside the cylinder body 11 by these covers 14 and 15. A piston rod 17 is attached to the piston 13, and a shaft member 18 that reciprocates in the axial direction is formed by the piston 13 and the piston rod 17. The piston rod 17 protrudes to the outside through a through hole 19 formed in the cover 14, the cover 14 is a rod cover through which the piston rod 17 passes, and the cover 15 closes the end of the cylinder body 11. It is a head cover.

  The cylinder chamber 16 is partitioned by the piston 13 into a fluid chamber 16a for projecting movement and a fluid chamber 16b for retracting movement, and the cylinder body 11 has supply / discharge ports 20a, 20b communicating with the fluid chambers 16a, 16b. Is formed. When compressed air is supplied from the supply / discharge port 20a, the piston rod 17 moves forward in the direction protruding from the cover 14 by the piston 13, and when compressed air is supplied from the supply / discharge port 20b, the piston rod 17 moves backward in the direction of retraction by the piston 13. To do.

  The cylinder body 11 has a base portion 11a and a stroke end portion 11b, and the stroke end portion 11b is abutted against and fixed to the base portion 11a. A cylindrical movable stopper 21 is mounted between the piston 13 and the cover 14 so as to be rotatable in the cylinder body 11 and movable in the axial direction. A male screw 23 is formed on the outer peripheral surface of the movable stopper 21 and is screwed to a female screw 22 formed on the inner peripheral surface of the stroke end portion 11b. The end surface of the movable stopper 21 facing the piston 13 is the contact surface of the piston 13. The stopper surface 24 comes into contact with 13d. Thereby, when the movable stopper 21 is rotated and the movable stopper 21 is moved in the axial direction, the position where the contact surface 13d of the piston 13 contacts the stopper surface 24 changes, and the stroke end of the piston rod 17 in the protruding direction changes. The position can be changed. The piston rod 17 may be formed with a step portion that comes into contact with the stopper surface 24, and the stopper surface 24 may be brought into contact with the step portion. Either the piston 13 or the piston rod 17 constituting the shaft member 18 may be used. The stopper surface 24 may be brought into contact with one of them.

  A through hole 25 through which the piston rod 17 passes is formed in the movable stopper 21, a seal member 26 for sealing between the through hole 25 and the piston rod 17, an inner peripheral surface of the cylinder hole, and the movable stopper 21. The movable stopper 21 is mounted with a seal member 27 for sealing between the outer peripheral surface of the movable stopper 21.

  An annular driven gear 31 as a rotating body is mounted inside the cylinder body 11 so as to be positioned between the cover 14 and the movable stopper 21. The driven gear 31 is rotatably accommodated in a receiving hole 32 formed in the cylinder body 11 having a diameter larger than that of the female screw 22, and the piston rod 17 penetrates the center of the driven gear 31. Two rotation transmission pins 33 are attached to the driven gear 31 at a phase of 180 degrees in the rotation direction, and each rotation transmission pin 33 protrudes in the axial direction toward the movable stopper 21 and is formed in the movable stopper 21. The fitting hole 34 is relatively slidably fitted.

  As shown in FIG. 5, drive gears 35 respectively meshed with the driven gear 31 at two diagonal positions of the four corners of the cylinder body 11 having a substantially square cross section are rotatable on a bearing sleeve 37 fixed by a bolt 36. It is attached. Therefore, when at least one of the drive gears 35 is manually rotated, the driven gear 31 meshing with the drive gear 35 is rotationally driven. The rotation of the driven gear 31 is transmitted to the movable stopper 21 via the rotation transmission pin 33, and the movable stopper 21 moves in the axial direction along with the rotation. Thereby, since the position of the stopper surface 24 of the movable stopper 21 changes, the position of the piston 13 contacting the stopper surface 24 changes, and the position of the stroke end in the protruding direction of the piston rod 17 changes. Each bolt 36 also functions as a member for fixing the stroke end portion 11b of the cylinder body 11 to the base portion 11a.

  As shown in FIG. 3, the outer peripheral portion of the drive gear 35 protrudes outward from the outer peripheral surface of the cylinder body 11, so that it is possible to easily perform a rotation operation when the drive gear 35 is manually driven to rotate. it can.

  6A is an enlarged cross-sectional view of a portion 6A in FIG. 4A, and FIG. 6B is an enlarged cross-sectional view of a portion 6B in FIG. 5A.

  As shown in FIG. 6, in the guide hole 41 formed corresponding to the driven gear 31 of the cylinder body 11, the meshing pin 42 is reciprocally movable in the radial direction of the piston rod 17 as a rotation restricting member and is rotatable. It is installed. The engagement pin 42 has a base end portion 42a and a tip end portion 42b which is provided integrally with the base end portion 42a via the constricted portion 43 and has a smaller diameter than the base end portion 42a. A tapered meshing portion 44 having a smaller diameter as it goes toward is provided. When the meshing portion 44 enters the tooth gap between the tooth surfaces of the driven gear 31, the rotation of the driven gear 31 is restricted.

  An operation knob 45 is attached to the base end portion 42a of the meshing pin 42, and is positioned inside the operation knob 45 so as to bias the spring force in the direction away from the driven gear 31 to the meshing pin 42. A return spring 46 made of a compression coil spring is attached to the meshing pin 42. When the operation knob 45 is pushed against the spring force of the return spring 46, the meshing portion 44 enters the tooth groove of the driven gear 31 and the rotation of the driven gear 31 is restricted.

  A retaining pin 47 is fixed to the cylinder body 11 in order to hold the meshing pin 42 in the pushed-in state, and the meshing pin 42 is pushed in until the constricted portion 43 of the meshing pin 42 reaches the position of the retaining pin 47. When the engagement pin 42 is rotated in this state, the retaining pin 47 enters the constricted portion 43 and the return movement of the engagement pin 42 is restricted. A notch 48 is formed by communicating the constricted portion 43 at the tip 42 b of the engagement pin 42, and the engagement is performed while the engagement pin 42 is rotated until the notch 48 reaches the position of the retaining pin 47. When the pressing force against the pin 42 is released, the meshing pin 42 is moved away from the driven gear 31 by the spring force of the return spring 46 and the rotation restriction of the driven gear 31 by the meshing pin 42 is released.

  The fluid pressure cylinder 10a is used by attaching the cover 14 to the attachment member 50a as indicated by a two-dot chain line in FIG. 2, or the attachment member at the end face of the cylinder body 11 on the cover 15 side. Used by attaching to 50b. In order to attach the attachment member 50 a to the cover 14, as shown in FIG. 1, two screw holes 51 are formed in the cover 14, and the cylinder body 11 is used by using bolts (not shown) that are screwed to the screw holes 51. Is attached to the attachment member 50a. On the other hand, as shown in FIG. 3, four screw holes 52 are formed in the end face of the cylinder body 11 so as to correspond to the four corners, and the cylinder body 11 is used by using bolts (not shown) screwed to the screw holes 52. Is attached to the attachment member 50b. Whether the fluid pressure cylinder 10a is attached to the attachment member 50a at the cover 14 portion or whether the fluid pressure cylinder 10a is attached to the attachment member 50b at the end face portion of the cylinder body 11 is set according to the use state of the fluid pressure cylinder 10a.

  As shown in FIGS. 1 and 3, a total of eight sensor mounting grooves 53 having a U-shaped cross section are formed on each of the upper, lower, left, and right outer surfaces of the cylinder body 11 in the drawing. A sensor for detecting that the piston rod 17 is at the position of the projecting stroke end and a sensor for detecting that the piston rod 17 is at the position of the reverse stroke end are mounted in each sensor mounting groove 53. It has become. Each sensor is a magnetic sensor sensitive to the magnetic force of the magnet 13b provided on the piston 13 as shown in FIG. 4, and each of the eight sensor mounting grooves 53 depends on the usage state of the fluid pressure cylinder 10a. This sensor will be attached.

  Next, the operation of the above-described fluid pressure cylinder 10a will be described. First, as shown in FIG. 4A, when the movable stopper 21 is in the state farthest from the piston 13, the reciprocating stroke of the piston rod 17 is the longest as indicated by the symbol S0 in FIG. FIG. 4B shows a state in which the movable stopper 21 is moved to the piston 13 side from the position shown in FIG. 4A. In this case, the reciprocating stroke S1 of the piston rod 17 is Since the position of the stroke end on the protruding side is close to the cylinder body 11 side, the stroke end is shorter than the stroke S0. In this way, by changing the axial position of the movable stopper 21, the reciprocating stroke of the piston rod 17 can be adjusted from the longest S0 to an arbitrary value shorter than this.

  In order to change the distance between the stopper surface 24 and the piston 13 by adjusting the position of the movable stopper 21 in the axial direction, as shown in FIGS. When the engagement pin 42 is manually rotated until it reaches the position 47, when the hand is released from the engagement pin 42, the engagement pin 42 moves outward by the spring force of the return spring 46, and the engagement pin 42 The meshing between 42 and the driven gear 31 is released. When the drive gear 35 is rotated in this state, the driven gear 31 is rotated by the rotation, and the movable stopper 21 is moved in the axial direction via the rotation transmission pin 33 to move in the axial direction, so that the piston rod 17 protrudes. The stroke end position changes, and the length of the reciprocating stroke of the piston 13 is adjusted. When the engagement pin 42 is manually pushed in with the position of the movable stopper 21 set, the tip of the engagement pin 42 is engaged with the driven gear 31 and the rotation of the driven gear 31 is restricted. When the meshing pin 42 is rotated in this state, the retaining pin 47 enters the constricted portion 43 and the meshing pin 42 maintains the state where the rotation of the driven gear 31 is restricted. 4A and 5A show a state in which the retaining pin 47 has entered the constricted portion 43 and the meshing pin 42 has entered between the tooth surfaces of the driven gear 31 as described above.

  In this way, in this fluid pressure cylinder 10a, the position of the stroke end when the piston 13 protrudes is adjusted by rotating the drive gear 35 and changing the axial position of the movable stopper 21, and the length of the reciprocating stroke. Can be adjusted. The stroke length is adjusted by rotating the drive gear 35 provided inside the cover 14 without rotating the cover 14, so that the fluid pressure cylinder 10a is attached to a mounting member 50a such as a jig. It is possible to use the surface of the cover 14 as an attachment surface for attachment to the cover. When adjusting the stroke, it is possible to install in a narrow space because there is no adjustment member such as an adjustment rod at the end of the cylinder body 11 on the retreat side.

  The movement of the movable stopper 21 can be restricted by pressing the meshing pin 42 as a rotation regulating member to restrict the rotation of the driven gear 31. When the meshing between the meshing pin 42 and the driven gear 31 is released, the driven gear 31 is moved. Since it can be rotated, the movement of the movable stopper 21 can be restricted without using a set screw, a bolt and a nut, and a tool such as a hexagon wrench is not required when the movement is restricted.

  7 to 15 are cross-sectional views showing fluid pressure cylinders 10b to 10g according to other embodiments of the present invention. In these drawings, members common to the fluid pressure cylinder 10a shown in FIG. 1 to FIG.

  In the fluid pressure cylinder 10b shown in FIG. 7, the above-described fluid pressure cylinder 10a changes the position of the stroke end when the piston rod 17 protrudes, whereas the stroke when the piston rod 17 returns, that is, when the piston rod 17 moves backward. The position of the end is changed. The rod-side cover 14 through which the piston rod 17 passes is attached to the cylinder body 11 by a retaining ring 55, and the head-side cover 15 attached to the rear end portion of the cylinder body 11 is bolted 36 to the cylinder body 11. It is designed to be attached to the end face.

  The movable stopper 21 is mounted between the piston 13 and the cover 15 so as to be rotatable and movable in the axial direction, and the driven gear 31 is rotatably mounted between the cover 15 and the movable stopper 21. Therefore, by rotating the drive gear 35 and changing the axial position of the movable stopper 21 to change the position of the stopper surface 24, the position where the rear end surface of the piston 13 abuts against the stopper surface 24 is changed, and the reverse position is reduced. The position of the stroke end can be changed. Unlike the case shown in FIG. 4, the movable stopper 21 shown in FIG. 7 is not formed with a through hole 25 for allowing the piston rod 17 to pass therethrough.

  The fluid pressure cylinder 10c shown in FIG. 8 can change both the position of the stroke end when the piston rod 17 protrudes and the position of the stroke end when the piston rod 17 moves backward. The cylinder body 11 is composed of a base portion 11a and two stroke end portions 11b attached to both ends thereof, and the fluid pressure cylinder 10c is a combination of the fluid pressure cylinders 10a and 10b. Thereby, the position of the forward stroke end when the piston rod 17 protrudes is adjusted by operating the drive gear 35 on the cover 14 side, and the position of the backward stroke end when the piston rod 17 moves backward is the position on the cover 15 side. It is adjusted by operating the drive gear 35.

  The fluid pressure cylinders 10 a to 10 c described above are of a single rod type in which the piston rod 17 projects from one end side of the cylinder body 11, but the piston rod 17 projects from both ends of the cylinder body 11. The present invention can also be applied to the double rod type hydraulic cylinder.

  FIG. 9 shows a double rod type fluid pressure cylinder 10d. In addition to the piston rod 17 protruding from one end of the cylinder body 11, a piston rod 17 a protruding from the other end is attached to the piston 13. In this type of fluid pressure cylinder 10d, similarly to the cover 14 shown in FIG. 7, the cover 15 from which the piston rod 17a protrudes is incorporated in the cylinder body 11 and attached by a retaining ring 55. The piston rod 17a protrudes outside through the formed through hole 19a. The fluid pressure cylinder 10d changes the position of the stroke end in the projecting direction of the piston rod 17 in the same manner as the fluid pressure cylinder 10a shown in FIG. 1. When the piston rod 17 reaches the projecting limit position, the piston rod 17 17a is a backward limit position.

  The fluid pressure cylinder 10e shown in FIG. 10 is a double rod type similar to that shown in FIG. The cylinder body of the fluid pressure cylinder 10e is formed by a base portion 11a and two stroke end portions 11b fixed to the both end portions similarly to the fluid pressure cylinder 10c shown in FIG. 8, and the fluid pressure cylinder shown in FIG. Similar to the cylinder 10d, the piston 13 is provided with a piston rod 17a protruding from the other end in addition to the piston rod 17 protruding from one end of the cylinder body 11.

  In the fluid pressure cylinder 10e, as in the fluid pressure cylinder 10c shown in FIG. 8, the movable stoppers 21 are mounted on both the covers 14 and 15 side, and between the covers 14 and 15 and the movable stoppers 21, respectively. A driven gear 31 is provided, and the piston rod 17a protrudes through the through hole 25 formed in the movable stopper 21 on the cover 15 side.

  In such double rod type fluid pressure cylinders 10d and 10e, the workpieces, jigs and the like can be simultaneously driven by the respective piston rods 17 and 17a.

  Since each of the fluid pressure cylinders 10a to 10e has the cylinder body 11 formed by the base portion 11a and the stroke end portion 11b, the base portion 11a and the stroke end portion 11b are used as a common member, and all the types described above are used. The fluid pressure cylinders 10a to 10e can be assembled.

  The fluid pressure cylinder 10f shown in FIGS. 11 to 13 is configured to change the position of the stroke end when the piston rod 17 protrudes, similarly to the fluid pressure cylinder 10a described above. The cylinder body 11 has a base portion 11a and a stroke end portion 11b that is abutted against the tip thereof. The cover 14 attached to the tip of the stroke end portion 11b has a cylindrical portion 14a in which a receiving hole 32 is formed and an end plate portion 14b in which a through hole 19 through which the piston rod 17 is formed is integrated. The portion 14 a constitutes the cylinder body 11.

  A female screw 22 is formed on the entire inner peripheral surface of the stroke end portion 11b in the axial direction, and a male screw 23 that is screwed to the female screw 22 is formed on the movable stopper 21. A driven gear 31 as a rotating body is rotatably mounted in the accommodation hole 32 formed in the cover 14, and the driven gear 31 has a body portion 31 a formed with external teeth and an outer shape of the external teeth. The boss portion 31b having a small diameter is integrated, and the axial dimension of each of the fluid pressure cylinders 10a to 10e is longer than the driven gear 31 by the boss portion 31b.

  As shown in FIGS. 12 and 13, one drive gear 35 that meshes with the driven gear 31 is rotatably attached to a sleeve 37 that is fixed to a bolt 36. As shown in FIG. 12, the drive gear 35 is located at the corner of the cover 14, and the outer periphery of the drive gear 35 protrudes outward from the outer peripheral surface of the cylinder body 11. Therefore, when the drive gear 35 is manually rotated, the driven gear 31 meshing with the drive gear 35 is rotationally driven, and the rotation of the driven gear 31 is transmitted to the movable stopper 21 via the rotation transmission pin 33. To move in the axial direction. Thereby, since the position of the stopper surface 24 of the movable stopper 21 changes, the position of the piston 13 contacting the stopper surface 24 changes, and the position of the stroke end in the protruding direction of the piston rod 17 changes. FIG. 11A shows the position where the movable stopper 21 contacts the end face of the driven gear 31, and the reciprocating stroke of the piston rod 17 is the largest. On the other hand, as shown in FIG. 11B, when the movable stopper 21 is rotated by the drive gear 35 to move the movable stopper 21 toward the piston 13, the position of the stroke end in the protruding direction of the piston rod 17 is obtained. This is a position retracted from the case shown in FIG.

  In the fluid pressure cylinder 10f shown in FIGS. 11 to 13, since one drive gear 35 is mounted at the corner of the cover 14, the mounting member 50a is attached to the cover 14 as shown in FIG. Not only can it be attached to the end face, but the attachment member can be fixed to two faces of the four outer faces of the cylinder body 11 where the drive gear 35 does not protrude.

  A recess 56 is formed in an annular shape on the outer peripheral surface of the boss 31b of the driven gear 31, and a screw member 57 for entering the recess 56 and fixing the driven gear 31 is attached to the cover 14 as a rotation restricting member. ing. Accordingly, when the driven gear 31 is fixed by the screw member 57 in a state where the position of the movable stopper 21 is adjusted by rotating the drive gear 35, the movement of the movable stopper 21 can be restricted.

  The hydraulic cylinder 10g shown in FIGS. 14 and 15 is positioned at the center of the cylinder body 11 in the width direction, and a drive gear 35 is rotatably mounted on the cover 14. Therefore, the drive gear 35 protrudes to the upper surface of the cylinder body 11 in FIG. The drive gear 35 is rotatably supported by a support pin 58 having one end fixed to the cover 14 and the other end fixed to the stroke end 11b. As in the driven gear 31 shown in FIG. 11, the driven gear 31 is integrally formed with a main body portion 31 a on which external teeth are formed and a boss portion 31 b having a smaller diameter than the external teeth. The through hole 19 of the cover 14 has an inner diameter corresponding to the outer diameter of the boss portion 31b, and the outer end face of the driven gear 31 is exposed to the outside.

  As shown in FIG. 14, the screw member 57 serving as a rotation restricting member that restricts the rotation of the driven gear 31 is attached to the two covers 14 while being shifted 90 degrees in the rotation direction of the driven gear 31 with respect to the drive gear 35. ing. Each screw member 57 is pressed against a recess 56 formed on the outer peripheral surface of the boss portion 31 b of the driven gear 31.

  As shown in FIG. 14, the drive gear 35 is positioned at the center of the cylinder body 11 in the width direction and is attached to the cover 14. Therefore, the mounting member is fixed to the other three surfaces where the drive gear 35 does not protrude. can do.

  Although the sensor mounting groove 53 is not shown in the base 11a of the fluid pressure cylinders 10f and 10g, the sensor mounting groove 53 is formed in the cylinder body 11 and the base 11a as in the above-described fluid pressure cylinder. Become.

Note that the fluid pressure cylinders 10a to 10e described above may have one drive gear 35 as in the fluid pressure cylinder 10f, and may use a screw member 57 as a rotation restricting member as shown in FIG. Further, in the fluid pressure cylinders 10f and 10g of the type shown in FIGS. 11 to 15, the position of the stroke end when the piston rod 17 is retracted may be changed similarly to the fluid pressure cylinder 10b shown in FIG. may be changed and the position of retraction stroke end during retraction and a position of the forward limit the stroke end when the projection of the fluid pressure cylinder 10c as well as the piston rod 17 shown in FIG. 8, 9 and 10 Similarly to the fluid pressure cylinders 10d and 10e shown in FIG.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

For example, in each of the embodiments, the stopper surface 24 of the movable stopper 21 is brought into contact with the piston 13, but by providing a step portion in contact with the stopper surface 24 on the piston rod 17, the step portion is provided. The stopper surface 24 may be brought into contact with the stroke end to regulate the stroke end. Further, the working medium supplied to the fluid chambers 16a and 16b is not limited to compressed air, and other fluids such as working oil may be used as the working medium. Furthermore, the outer shape of the cylinder body 11 is not limited to a quadrilateral, and may be a circular cross-sectional shape.

  This fluid pressure cylinder is used to move a jig or a workpiece.

Claims (8)

A cylinder body provided with covers at both ends and a cylinder chamber formed therein;
A shaft member that is reciprocally mounted in the cylinder chamber and includes a piston that defines a fluid chamber on both sides, and a piston rod that penetrates at least one cover from the cylinder body and protrudes outward in the axial direction;
A male screw that is screw-coupled to a female screw formed on the inner peripheral surface of the end of the cylinder body is formed on the outer peripheral surface and moves in the axial direction as it rotates to contact the shaft member and A movable stopper that changes position,
A driven gear that is positioned between the movable stopper and the cover and is rotatably mounted inside the cylinder body, and rotates the movable stopper;
Wherein provided at an end portion of the cylinder body rotatably around a rotation axis parallel to the driven gear, and a drive gear for rotating the driven gear meshes with the driven gear,
Fluid pressure cylinder, characterized in that to adjust the stroke end position of the shaft member of the axial position is changed in by Ri said movable stopper to rotate the driven gear by the drive gear. The fluid pressure cylinder according to claim 1, provided with a rotation transmission pin sliding are freely fitted in a fitting hole formed in the movable stopper to the driven gear, the rotation transmission pins rotation of the driven gear fluid pressure cylinder, characterized that you transmitted to the movable stopper through. 3. The fluid pressure cylinder according to claim 1, wherein an outer peripheral portion of the drive gear is pushed outward from an outer peripheral surface of the cylinder body. 4. The fluid pressure cylinder according to any one of claims 1 to 3 , wherein a rotation restricting member for restricting rotation of the driven gear is provided in the cylinder body. The fluid pressure cylinder according to any one of claims 1 to 4 , wherein the drive gear is rotatably mounted on the cover. 6. The fluid pressure cylinder according to claim 5 , wherein the drive gear is positioned at the center in the width direction of the cylinder and is rotatably mounted on the cover. The fluid pressure cylinder according to any one of claims 1 to 6 , wherein the movable stoppers are respectively attached to both ends of the cylinder body, and the axial positions of the movable stoppers are respectively provided in the cylinder body. The fluid pressure cylinder is characterized in that the position of both stroke ends of the reciprocation of the shaft member is adjusted by changing the driving gear . The fluid pressure cylinder according to any one of claims 1 to 7 , wherein the shaft member is provided with a piston rod protruding in an axial direction from both ends of the cylinder body.

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