Fluid pressure cylinder

Abstract

A fluid pressure cylinder (10) is provided with a cylinder unit (14) and a cylinder housing (12) in which a housing chamber (31) is formed. The cylinder housing has a first fastening unit (26). The cylinder unit has a piston (60), a piston rod (62) provided with the piston, a sleeve (66) accommodating the piston, and a second fixing unit (32). The cylinder unit is housed in the housing chamber. Furthermore, the cylinder unit is detachably connected to the cylinder housing by engaging the first fixing unit and the second fixing unit.

Description

Technical Field

[0001] The present invention relates to a fluid pressure cylinder that operates based on the supply and discharge of pressure fluid. Background Art

[0002] As described in Japanese Patent Publication No. 2019-113101, the cylinder includes a cylinder barrel having a piston chamber and a piston accommodated in the piston chamber. In addition, the cylinder is connected with a supply and discharge pipe for supplying compressed air to the piston chamber and discharging the compressed air. Depending on the circumstances, a position sensor for detecting the position of the piston is sometimes also provided in the cylinder barrel. In addition, a sealing component (gasket) is installed on the side circumferential wall (peripheral portion) of the piston. The sealing component seals between the side circumferential wall of the piston and the inner circumferential wall of the piston chamber.

[0003] The piston moves in the piston chamber based on the supply and discharge of compressed air relative to the piston chamber. In this process, the sealing component slides in contact with the side wall of the piston. Therefore, when the cylinder is repeatedly moved, the sealing component will wear. In other words, the sealing component is a consumable part. In addition to the sealing component, the cylinder also includes various consumable parts. Therefore, regular maintenance is required in the cylinder.

[0004] The cylinder is, for example, mounted on a predetermined device. Therefore, when performing maintenance on the cylinder, the cylinder needs to be removed from the predetermined device. Next, the supply and exhaust pipes are removed from the cylinder. If a position sensor is mounted on the cylinder, the position sensor is removed from the cylinder. Next, the cylinder is disassembled to replace consumable parts.

[0005] Then, assemble the cylinder, and then install the position sensor on the cylinder. Then, install the supply and discharge pipes on the cylinder. Then, install the cylinder on a specified device, and further adjust the installation position of the position sensor. That is, for example, move the piston to a specified position, and configure the position sensor at a position that can detect the piston in this state. After the above process, the maintenance is completed.

[0006] As can be understood from the above, the maintenance of the cylinder includes many operation steps. Therefore, it is not easy to perform maintenance on the cylinder. In addition, during the process of performing maintenance on the cylinder, the device on which the cylinder is installed must be stopped. Therefore, the operating efficiency of the device is reduced.

[0007] In addition, after the cylinder is assembled, the piston is housed inside the cylinder tube, so the operator cannot visually check the piston. Under such circumstances, it is not easy to align the piston with the position sensor. Summary of the invention

[0008] An object of the present invention is to solve the above-mentioned problems.

[0009] According to one embodiment of the present invention, a fluid pressure cylinder is provided, comprising: a cylinder housing, which is formed with a receiving chamber; and a cylinder unit, which is received in the receiving chamber in a pluggable manner, the cylinder housing having a first fixing unit and a position sensor, and the cylinder unit having: a piston, which is pressed by a pressure fluid; a piston rod, which is provided with the piston; a sleeve, which has a piston chamber formed inside for sliding the piston; a first retaining frame, which holds one end of the sleeve; a second retaining frame, which holds the other end of the sleeve; and a second fixing unit, which can be engaged with the first fixing unit, and a through hole for inserting the piston rod is formed in at least one of the first retaining frame and the second retaining frame, and by engaging the first fixing unit with the second fixing unit, the cylinder unit is connected to the cylinder housing in a loadable and detachable manner, and the position of the position sensor matches the position of the piston.

[0010] The fluid pressure cylinder of the above structure has a cylinder unit in which a piston and a piston rod are integrally assembled. The cylinder unit is accommodated in a receiving chamber of a cylinder housing in a pluggable manner. Therefore, when the maintenance period of the cylinder unit comes, for example, the cylinder unit is replaced with a spare part. In this way, the fluid pressure cylinder can be operated again.

[0011] As can be understood from this, in the present invention, when replacing the cylinder unit with a spare part, it is not particularly necessary to remove the cylinder housing from the device. That is, the cylinder unit can be replaced with a spare part while the cylinder housing is fixed to the device. In addition, it is not particularly necessary to remove the position sensor and the wiring connected to the position sensor from the cylinder housing.

[0012] Thus, according to the present invention, for example, by replacing the cylinder unit with a spare part, maintenance on the fluid pressure cylinder can be completed. In this case, the maintenance work is only to replace the cylinder unit with a spare part. For the reasons mentioned above, the maintenance work process is reduced. In addition, the work is simplified. That is, the fluid pressure cylinder can be easily maintained in a short time. Therefore, the operation stop time of the equipment is shortened.

[0013] Moreover, the cylinder unit and the cylinder housing are connected based on the engagement of the first fixing unit and the second fixing unit. Therefore, it is easy to connect the cylinder unit and the cylinder housing. In addition, by releasing the engagement of the first fixing unit and the second fixing unit, the connection between the cylinder unit and the cylinder housing can be released. In this way, according to the above-mentioned structure, the cylinder unit can be easily loaded and unloaded relative to the cylinder housing.

[0014] Furthermore, the mounting position of the position sensor relative to the cylinder housing is the same before and after the cylinder unit is removed from the cylinder housing. Therefore, by inserting and mounting the cylinder unit into the cylinder housing, the piston is located at a predetermined position to match the position of the position sensor. That is, the piston and the position sensor are aligned. In this way, even when the operator cannot visually confirm the piston, it is easy to align the piston and the position sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic overall perspective view of a cylinder according to an embodiment of the present invention.

[0016] Figure 2 It is from Figure 1 Schematic overall perspective view of the cylinder viewed from different directions.

[0017] Figure 3 It is an exploded perspective view of the cylinder.

[0018] Figure 4 It is a side cross-sectional view of the cylinder along the axial direction.

[0019] Figure 5 This is a top view of the cylinder viewed from the Z2 direction.

[0020] Figure 6 This is an exploded perspective view when the piston, the first retainer, and the cover member are removed from the piston rod.

[0021] Figure 7 It means the piston moves from Figure 4 A side sectional view of a state in which the moving state is performed. DETAILED DESCRIPTION

[0022] Hereinafter, an air cylinder is exemplified as a fluid pressure cylinder for explanation. Therefore, the pressure fluid is compressed air. In addition, the fluid pressure cylinder may also be a hydraulic cylinder. In this case, the pressure fluid is working oil. In addition, the air cylinder exemplified is a single-rod cylinder, but it may also be a double-rod cylinder.

[0023] The X direction shown in the drawings is the axial direction of the cylinder, cylinder housing or sleeve. The X1 direction and the X2 direction along the X direction are opposite directions to each other. The Y direction shown in the drawings is a horizontal direction orthogonal to the X direction. The Y1 direction and the Y2 direction along the Y direction are opposite directions to each other. The Z direction shown in the drawings is a vertical direction orthogonal to the X direction and the Y direction. The Z1 direction and the Z2 direction along the Z direction are opposite directions to each other.

[0024] Figure 1 It is a schematic overall perspective view of the cylinder 10 according to the present embodiment. Figure 2 It is from Figure 1A schematic overall perspective view of the cylinder 10 viewed from different directions. Figure 3 It is an exploded perspective view of the cylinder 10 . Figure 4 1 is a side cross-sectional view of the cylinder 10 along the axial direction. Figure 1 to Figure 4 As shown, the cylinder 10 includes a cylinder housing 12 and a cylinder unit 14 .

[0025] First, the cylinder housing 12 will be described. Figure 1 to Figure 3 As shown, the cylinder housing 12 is in a generally square cylindrical shape. Figure 4 As shown, both ends of the cylinder housing 12 in the X direction are open ends. A cover member 16 is provided as a closing portion at the first opening 15a which is an opening on the X1 side of the cylinder housing 12. That is, the first opening 15a of the cylinder housing 12 is closed by the cover member 16. Figure 2 and Figure 4 As shown, the cover member 16 includes a large-diameter disk portion 17 and a small-diameter cylindrical portion 18 . The cylindrical portion 18 protrudes from the X1 -side end surface of the disk portion 17 .

[0026] In the cover member 16, a first side groove 19 is formed on the side peripheral wall of the circular plate portion 17 (see Figure 4 ). An annular outer sealing member 20 is housed in the first lateral groove 19. The outer sealing member 20 hermetically seals the side circumferential wall of the circular plate portion 17 and the inner circumferential wall of the cylinder housing 12. On the other hand, a second lateral groove 22 is formed in the inner circumferential wall of the cylinder housing 12 near the first opening 15a. A retaining ring 24 passing through the cylindrical portion 18 is housed in the second lateral groove 22. The retaining ring 24 prevents the cover member 16 from detaching from the cylinder housing 12. In this way, the cover member 16 is positioned and fixed to the cylinder housing 12.

[0027] A C-shaped snap cable may be used instead of the snap ring 24. In this case, an annular groove (not shown) is formed on the side circumferential wall of the circular plate portion 17 at a position opposite to the second lateral groove 22. As the snap cable is inserted into the second lateral groove 22 and the annular groove, the cover member 16 is prevented from falling off from the cylinder housing 12.

[0028] A first threaded portion 26 is provided on the inner peripheral wall of the cylinder housing 12. Specifically, the first threaded portion 26 is provided at the second opening 15b which is the X2 side opening of the cylinder housing 12. Here, the cylinder unit 14 has a second retaining frame 30 which will be described later. In the second retaining frame 30, a second threaded portion 32 is provided on the outer peripheral wall of the X2 side end portion. By screwing the second threaded portion 32 with the first threaded portion 26, the second opening 15b of the cylinder housing 12 is closed by the second retaining frame 30. With this closing, a space surrounded by the X2 side end surface of the circular plate portion 17 of the cover member 16, the X1 side end surface of the second retaining frame 30, and the inner peripheral wall of the cylinder housing 12 is formed inside the cylinder housing 12. This space is a storage chamber 31 for storing the cylinder unit 14.

[0029] like Figure 1 to Figure 3 As shown, the first protrusion 34a and the second protrusion 34b are respectively provided at the Y1 side end and the Y2 side end of the cylinder housing 12 in the Z1 direction. The third protrusion 34c and the fourth protrusion 34d are respectively provided at the Y1 side end and the Y2 side end of the cylinder housing 12 in the Z2 direction. The first protrusion 34a to the fourth protrusion 34d extend in the axial direction (X direction) at the corner of the cylinder housing 12. Long holes 38 are respectively formed in the first protrusion 34a to the fourth protrusion 34d. For example, a long bolt (not shown) for connecting the cylinder 10 to a predetermined machine or device or other equipment is inserted into the long hole 38.

[0030] like Figure 5 As shown, at the Z2 side end portion of the cylinder housing 12, a first sensor mounting groove 40a is formed near the third protrusion 34c, and a second sensor mounting groove 40b is formed near the fourth protrusion 34d. A first position sensor 42a is mounted in the first sensor mounting groove 40a, and a second position sensor 42b is mounted in the second sensor mounting groove 40b. The first position sensor 42a and the second position sensor 42b are respectively accommodated in the first sensor mounting groove 40a and the second sensor mounting groove 40b. The first position sensor 42a and the second position sensor 42b are respectively electrically connected to a control unit not shown in the figure via cables 46a and 46b.

[0031] The flat portion 44 of the cylinder housing 12 is formed with a first mounting hole 52a for mounting the first pipe joint 50a and a second mounting hole 52b for mounting the second pipe joint 50b. Figure 4 and Figure 5 As shown, a first input / output port 54a is formed at the bottom of the first mounting hole 52a. A second input / output port 54b is formed at the bottom of the second mounting hole 52b. Compressed air is supplied to and discharged from the cylinder unit 14 via the first input / output port 54a and the second input / output port 54b.

[0032] The first pipe joint 50a is connected to the top end of the first supply and exhaust pipe 56a, and the second pipe joint 50b is connected to the top end of the second supply and exhaust pipe 56b. The other ends of the first supply and exhaust pipe 56a and the second supply and exhaust pipe 56b, which are not shown in the figure, are respectively connected to supply and exhaust mechanisms, which are not shown in the figure. Compressed air flows through the first supply and exhaust pipe 56a and the second supply and exhaust pipe 56b.

[0033] Next, the cylinder unit 14 will be described. Figure 4 As shown, the cylinder unit 14 is an assembly including a first holder 58 , a piston 60 , a piston rod 62 , a second holder 30 , and a sleeve 66 .

[0034] The sleeve 66 is a cylindrical body, and the piston 60 slides inside the sleeve 66. That is, the internal space of the sleeve 66 is the piston chamber 68.

[0035] The first retainer 58 retains the X-side end (one end) of the sleeve 66. When the cylinder unit 14 is inserted into the storage chamber 31, the first retainer 58 is located between the circular plate portion 17 of the cover member 16 and the piston 60. The circular plate portion 17 and the first retainer 58 are slightly separated. That is, a first annular gap 63 is formed between the circular plate portion 17 and the first retainer 58. The first annular gap 63 is connected to the first input / output port 54a.

[0036] An outer annular groove 64 is formed on the outer peripheral wall of the first retainer 58. An annular first unit seal 65 is accommodated in the outer annular groove 64. The first unit seal 65 hermetically seals between the inner peripheral wall of the cylinder housing 12 and the outer peripheral wall of the first retainer 58. The first input / output port 54a is located between the outer seal member 20 and the first unit seal 65 in the X direction.

[0037] The first retainer 58 has a first engaging end 70 that protrudes toward the piston 60. The first engaging end 70 is inserted into one end portion (the X1 side end portion) of the sleeve 66. Figure 6 As shown, a receiving recess 71 is formed on the X1 side end surface of the first retainer 58, which is recessed toward the first engaging end 70. A through hole 72 is formed in the first retainer 58, which passes through the first retainer 58 in the X direction. An annular insertion groove 74 is formed in the radially outer edge portion of the bottom of the receiving recess 71, which is recessed toward the radially outer side.

[0038] A retainer side damper 76, which is an annular elastic member, is accommodated in the accommodation recess 71. The retainer side damper 76 includes a first main body portion 78 and an annular first flange portion 80. The first flange portion 80 is inserted into the insertion groove 74. This insertion prevents the retainer side damper 76 from being detached from the accommodation recess 71. The X1 side end portion of the first main body portion 78 is slightly exposed from the accommodation recess 71.

[0039] The retainer side damper 76 has a guide hole 82 overlapping with the through hole 72. The guide hole 82 is a hollow portion of the retainer side damper 76. In addition, three guide paths 84 are formed in the first main body portion 78. The guide paths 84 extend from the outer peripheral wall of the first main body portion 78 toward the inner peripheral wall along the diameter direction of the retainer side damper 76. The outer peripheral opening of the guide path 84 is connected to the first annular gap 63, and the inner peripheral opening of the guide path 84 is connected to the guide hole 82. In this way, the first annular gap 63 and the guide hole 82 are connected via the guide path 84. The guide path 84 is a groove formed in the end face 77 (the end face abutting against the circular plate portion 17) of the retainer side damper 76.

[0040] The X2 side end surface of the first retainer 58 and the X1 side end surface 61 of the piston 60 (see Figure 6 ) and the inner peripheral wall of the sleeve 66 form a first chamber 86. The first chamber 86 is a space on one side of the piston chamber 68 partitioned by the piston 60.

[0041] The piston 60 has a fitting hole 87, a gasket mounting groove 88, and a magnet mounting groove 89 (see Figure 6 The X1 side end portion of the piston rod 62 is fitted into the fitting hole 87 (see Figure 4 A gasket 90 and a magnet 92 are housed in the gasket mounting groove 88 and the magnet mounting groove 89, respectively. The annular gasket 90 seals the outer peripheral wall of the piston 60 and the inner peripheral wall of the sleeve 66 in an airtight manner.

[0042] like Figure 6 As shown, a mounting recess 94 is formed on the X1 side end face 61 of the piston 60. An annular retaining groove 96 that is recessed toward the radial outside is formed in the radial outer edge portion of the bottom of the mounting recess 94. A first damper 98 is accommodated in the mounting recess 94. The first damper 98 has a second main body portion 100 and an annular second flange portion 102. The second flange portion 102 is inserted into the retaining groove 96. By this insertion, the first damper 98 is prevented from detaching from the mounting recess 94. The X1 side end portion of the second main body portion 100 is slightly exposed from the mounting recess 94. That is, the X1 side end portion of the first damper 98 protrudes toward the first retaining frame 58 compared with the X1 side end face 61 of the piston 60 (the end face opposite to the first retaining frame 58).

[0043] The first damper 98 has an inlet and outlet hole 104 as a hollow portion and two inlet and outlet paths 106. The two inlet and outlet paths 106 are formed in the second main body 100. The inlet and outlet hole 104 is opposite to the through hole 72. The inlet and outlet paths 106 extend from the outer peripheral wall of the second main body 100 toward the inner peripheral wall along the diameter direction of the first damper 98. The inlet and outlet paths 106 guide the compressed air flowing into the inlet and outlet holes 104 to the first chamber 86 located outside the inlet and outlet holes 104 in the diameter direction. The inlet and outlet paths 106 are grooves formed on the X1 side end surface of the first damper 98.

[0044] The second retainer 30 retains the X2 side end portion (the other end portion) of the sleeve 66. Figure 4As shown, the second retainer 30 has a second engaging end 110 protruding toward the piston 60. The second engaging end 110 is inserted into the other end (X2 side end) of the sleeve 66. An engaging recess 112 is formed in the second retainer 30. An annular engaging groove 114 recessed toward the radial outside is formed in the radial outer edge portion of the bottom of the engaging recess 112. The second damper 116 is accommodated in the engaging recess 112. The second damper 116 has a third main body 118 and a third flange 120. The third flange 120 is inserted into the engaging groove 114. By this insertion, the second damper 116 is prevented from being detached from the engaging recess 112. The X1 side end of the third main body 118 is slightly exposed from the engaging recess 112. That is, the X1 side end of the second damper 116 protrudes toward the piston 60 compared with the X1 side end face (the end face opposite to the piston 60) of the second retainer 30.

[0045] The second damper 116 has a supply and exhaust hole 124. The diameter of the supply and exhaust hole 124 is larger than the diameter of the piston rod 62. That is, a second annular gap 126 is formed between the side peripheral wall of the piston rod 62 and the inner peripheral wall of the supply and exhaust hole 124.

[0046] The second chamber 128 is formed by the X2-side end surface of the piston 60, the X1-side end surface of the second retainer 30, and the inner peripheral wall of the sleeve 66. The second chamber 128 is a space on the other side of the piston chamber 68 partitioned by the piston 60.

[0047] The second retainer 30 is formed with an insertion hole 130 through which the piston rod 62 is inserted. An inner groove 132 is formed on the inner peripheral wall of the insertion hole 130. An annular rod seal 134 is accommodated in the inner groove 132. The rod seal 134 seals the side peripheral wall of the piston rod 62 and the inner peripheral wall of the insertion hole 130 in an airtight manner.

[0048] In the second retainer 30, a flow passage 136 is formed between the engagement recess 112 and the inner groove 132. The flow passage 136 includes a first passage 138 extending in the axial direction (X direction) of the second retainer 30 and a second passage 140 extending in the radial direction (Z direction) of the second retainer 30. The X1 side end of the first passage 138 is connected to the second annular gap 126. The X2 side end of the first passage 138 is closed by the rod seal 134. The Z1 side end of the second passage 140 is connected to the first passage 138. The Z2 side end of the second passage 140 is connected to the second input / output port 54b. That is, the second annular gap 126 is connected to the second input / output port 54b via the flow passage 136.

[0049] An annular outer groove 142 is formed in the outer peripheral wall of the second holder 30 at a position closer to the X2 direction than the second passage 140. An annular second unit seal 144 is accommodated in the outer peripheral wall of the second holder 30. The second unit seal 144 hermetically seals the outer peripheral wall of the second holder 30 and the inner peripheral wall of the accommodation chamber 31. That is, the first unit seal 65 and the second unit seal 144 prevent the compressed air in the piston chamber 68 from leaking into the accommodation chamber 31.

[0050] A second threaded portion 32 is formed on the outer peripheral wall of the second retaining frame 30 at the X2 side end. As described above, the second threaded portion 32 is screwed into the first threaded portion 26 formed at the X2 side end of the cylinder housing 12. In addition, an operating portion 146 protruding in the X2 direction is provided on the X2 side end surface of the second retaining frame 30. The operating portion 146 is, for example, a portion that is clamped by a tool such as an adjustable wrench, a fixed wrench, or pliers. Two flat surfaces 147 are formed on the outer peripheral wall of the operating portion 146 at positions that are lineally symmetrical with respect to the central axis of the second retaining frame 30 (see Figure 1 ).

[0051] In addition, the formation positions of the first threaded portion 26 and the second threaded portion 32 are not particularly limited to the above-mentioned positions. For example, the first threaded portion 26 may be provided at the first opening 15a, and the second threaded portion 32 may be provided at the outer peripheral wall of the disc portion 17 of the cover member 16. Alternatively, the first threaded portion 26 may be provided at the inner peripheral wall of the accommodation chamber 31, and the second threaded portion 32 may be provided at the outer peripheral wall of the sleeve 66.

[0052] The piston rod 62 passes through the insertion hole 130 of the second retainer 30. The piston 60 is mounted on the X1 side end of the piston rod 62. A connecting hole 148 is formed on the X2 side end of the piston rod 62. A part of the workpiece (not shown) is inserted into the connecting hole 148. Therefore, when the piston 60 is displaced in the sleeve 66, the piston rod 62 and the workpiece are displaced integrally with the piston 60. In addition, the so-called workpiece is, for example, a predetermined fixture.

[0053] The first engaging end 70 of the first retaining frame 58 is pressed into one end portion (X1 side opening) of the sleeve 66. The outer peripheral wall of the first engaging end 70 is in close contact with the inner peripheral wall of one end portion of the sleeve 66 throughout the entire circumference of the first engaging end 70. The second engaging end 110 of the second retaining frame 30 is pressed into the other end portion (X2 side opening) of the sleeve 66. The outer peripheral wall of the second engaging end 110 is in close contact with the inner peripheral wall of the other end portion of the sleeve 66 throughout the entire circumference of the second engaging end 110. By the above pressing, the X1 side opening of the sleeve 66 is closed by the first retaining frame 58, and the X2 side opening of the sleeve 66 is closed by the second retaining frame 30. The first retaining frame 58 and the second retaining frame 30 can be detached from the sleeve 66 by human power.

[0054] The cylinder 10 according to the present embodiment is basically configured as described above. Next, the effects of the cylinder 10 will be described.

[0055] The workpiece is connected to the piston rod 62. Specifically, a part of the workpiece is inserted into the connection hole 148 of the piston rod 62. The air cylinder 10 operates in this state.

[0056] Figure 4 The figure shows a state where the compressed air in the first chamber 86 is discharged and the compressed air is supplied to the second chamber 128. In this case, since the internal pressure of the second chamber 128 is higher than the internal pressure of the first chamber 86, the piston 60 is pressed by the compressed air in the second chamber 128 and moves in the X1 direction, and is located at the first position of the disc portion 17 closest to the cover member 16. When the piston 60 is moved in the X2 direction from this state, the compressed air is supplied to the first chamber 86 and discharged from the second chamber 128. Specifically, the compressed air is sent from the above-mentioned supply and discharge mechanism to the first supply and discharge pipe 56a. After the compressed air circulates in the first supply and discharge pipe 56a, it flows into the first input and output port 54a. The compressed air flows into the first annular gap 63 between the disc portion 17 and the first retaining frame 58 through the first input and output port 54a.

[0057] The compressed air flows from the first annular gap 63 to the guide path 84 of the retainer-side damper 76, and then flows from the guide path 84 to the guide hole 82 of the retainer-side damper 76. The compressed air further flows from the guide hole 82 to the through hole 72 of the first retainer 58. In other words, the compressed air in the first annular gap 63 reaches the through hole 72 via the guide path 84 and the guide hole 82.

[0058] The through hole 72 is opposite to the inlet and outlet hole 104 of the first shock absorber 98. Therefore, the compressed air moves from the through hole 72 to the inlet and outlet hole 104. Here, two inlet and outlet paths 106 are formed in the second main body 100 of the first shock absorber 98. The inlet and outlet paths 106 extend along the diameter direction of the second main body 100. Therefore, the compressed air in the inlet and outlet hole 104 flows into the first chamber 86 located on the outer side of the first shock absorber 98 in the diameter direction through the inlet and outlet paths 106. As a result, the internal pressure of the first chamber 86 rises, and the piston 60 starts to move in the X2 direction. In this way, based on the fact that the guide path 84 is formed in the retainer side shock absorber 76, a path for the compressed air from the first annular gap 63 toward the first chamber 86 is formed. That is, the path of the compressed air for pressing the piston 60 can be ensured.

[0059] As understood from the above, according to the present embodiment, even when the first damper 98 is in contact with the first retaining frame 58, the compressed air enters the first chamber 86 through the inlet and outlet holes 104. Therefore, not only the compressed air in the inlet and outlet holes 104 but also the compressed air in the first chamber 86 presses the piston 60. As a result, the area of ​​the piston 60 that is pressed by the compressed air becomes larger. In other words, the piston 60 fully bears the pressure of the compressed air. In addition, when the piston 60 starts to move in the X2 direction and the first damper 98 is separated from the first retaining frame 58, the compressed air flows directly into the first chamber 86 from the through hole 72 of the first retaining frame 58.

[0060] On the other hand, the compressed air in the second chamber 128 is discharged through the above-mentioned supply and discharge mechanism. Specifically, the compressed air in the second chamber 128 flows into the first passage 138 of the flow passage 136 through the second annular gap 126 formed based on the supply and discharge hole 124 of the second damper 116. The compressed air moves from the first passage 138 to the second passage 140, and then flows into the second supply and discharge pipe 56b through the second input and output port 54b. As a result, the compressed air in the second chamber 128 is discharged through the second supply and discharge pipe 56b. As a result, the internal pressure of the second chamber 128 decreases.

[0061] As the internal pressure difference is generated between the first chamber 86 and the second chamber 128 as described above, the piston 60 receives pressure from the compressed air in the first chamber 86. As a result, the piston 60 slides. That is, the piston 60 moves toward the second retainer 30 located at the end on the X2 side. As a result, the cylinder 10 becomes Figure 7 The status shown. Figure 7 In the embodiment, the piston 60 is located at the second position. As a result, the workpiece connected to the piston rod 62 moves. Based on the fact that the second position sensor 42b detects the magnetic force of the magnet 92, the piston 60 is detected to have reached the second position. The control unit receives the detection signal from the second position sensor 42b and recognizes that the piston 60 has moved to the second position.

[0062] The X2-side end surface of the piston 60 abuts against, for example, the third body portion 118 of the second damper 116. Thus, the impact transmitted from the piston 60 to the second retainer 30 is mitigated.

[0063] In order to return the piston 60 to Figure 4In the state shown, the compressed air is sent from the supply and exhaust mechanism to the second chamber 128, and the compressed air is exhausted from the first chamber 86 through the supply and exhaust mechanism. The compressed air in the first chamber 86 passes through the inlet and outlet path 106, the inlet and outlet hole 104, the through hole 72, the guide hole 82, the guide path 84, the first annular gap 63 and the first input and output port 54a in sequence, and flows into the first supply and exhaust pipe 56a. As a result, the compressed air in the first chamber 86 is exhausted through the first supply and exhaust pipe 56a, so the internal pressure of the first chamber 86 decreases.

[0064] After the compressed air sent from the above-mentioned supply and exhaust mechanism flows through the second supply and exhaust pipe 56b, it passes through the second input and output port 54b, the second passage 140, the first passage 138 and the second annular gap 126 in sequence and flows into the second chamber 128. As a result, the internal pressure of the second chamber 128 rises. As the internal pressure difference is generated between the first chamber 86 and the second chamber 128 as described above, the piston 60 slides. That is, the piston 60 moves toward the circular plate portion 17 of the cover member 16 located at the end on the X1 side and reaches the first position. As a result, the cylinder 10 returns to Figure 4 At this time, the workpiece connected to the piston rod 62 also moves. Based on the fact that the first position sensor 42a detects the magnetic force of the magnet 92, the piston 60 is detected to have reached the first position. The control unit receives the detection signal from the first position sensor 42a and recognizes that the piston 60 has moved to the first position.

[0065] When the piston 60 moves, the first damper 98 provided in the mounting recess 94 of the piston 60 abuts against the X2 side end surface of the first engaging end 70 of the first retainer 58. Thus, the impact transmitted from the piston 60 to the first retainer 58 is mitigated. Assuming that the first retainer 58 is pushed out in the X1 direction, the retainer side damper 76 provided in the receiving recess 71 of the first retainer 58 abuts against the X2 side end surface of the disc portion 17 of the cover member 16. Thus, the impact transmitted from the first retainer 58 to the cover member 16 is mitigated.

[0066] When the piston 60 repeatedly moves as described above, the gasket 90 mounted on the outer peripheral wall of the piston 60 repeatedly slides in contact with the inner peripheral wall of the sleeve 66. In addition, the rod seal 134 provided on the second retainer 30 repeatedly slides in contact with the piston rod 62. Due to the above sliding contact, the gasket 90 and the rod seal 134 are worn. When the gasket 90 and the rod seal 134 are excessively worn, compressed air leaks between the first chamber 86 and the second chamber 128, making it difficult to move the piston 60. In order to avoid this, the gasket 90 and the rod seal 134 are replaced with new ones.

[0067] Therefore, the operator who performs maintenance disengages the cylinder unit 14 from the cylinder housing 12. Specifically, the operator clamps the operating portion 146 of the second retainer 30 with a tool such as an adjustable wrench, a fixed wrench, or pliers. In this state, the operator rotates the tool, thereby rotating the second threaded portion 32 relative to the first threaded portion 26. As a result, the screwing of the second threaded portion 32 and the first threaded portion 26 is released. That is, the cylinder unit 14 is released from the constraint of the cylinder housing 12.

[0068] Then, if Figure 3 As shown, the operator pulls the operating portion 146 and the like in the X2 direction. Here, the rod seal 134 provided on the second retainer 30 is in close contact with the piston rod 62. The second retainer 30 holds the second damper 116 and the sleeve 66, and holds the first retainer 58 via the sleeve 66, and further holds the retainer-side damper 76 via the first retainer 58. In addition, the piston rod 62 holds the piston 60, and the piston 60 holds the first damper 98. Therefore, as the operator pulls the operating portion 146 and the like in the X2 direction, the cylinder unit 14 slides in the X2 direction. As a result, the cylinder unit 14 is pulled out from the storage chamber 31 of the cylinder housing 12.

[0069] A slight gap is formed between the inner peripheral wall of the receiving chamber 31 of the cylinder housing 12 and the outer peripheral wall of the sleeve 66. Therefore, interference between the sleeve 66 and the inner peripheral wall of the receiving chamber 31 is avoided. Therefore, the operator can easily slide the cylinder unit 14 in the X2 direction to detach the cylinder unit 14 from the cylinder housing 12.

[0070] Thus, according to the present embodiment, the cylinder unit 14 can be separated from the cylinder housing 12 while the first pipe joint 50a, the first supply and discharge pipe 56a, the second pipe joint 50b, and the second supply and discharge pipe 56b are connected to the cylinder housing 12. In addition, it is not necessary to remove the first position sensor 42a and the second position sensor 42b from the cylinder housing 12. It is also not necessary to remove the cables 46a and 46b that electrically connect the first position sensor 42a and the second position sensor 42b to the control unit from the cylinder housing 12. Furthermore, it is not particularly necessary to remove the cylinder housing 12 from the device.

[0071] Here, as described above, in the first position sensor 42a and the second position sensor 42b, the entirety is accommodated in the first sensor mounting groove 40a and the second sensor mounting groove 40b, respectively. Therefore, even when the cylinder housing 12 is removed from the device, the first position sensor 42a and the second position sensor 42b are prevented from interfering with certain objects. Therefore, the first position sensor 42a and the second position sensor 42b are prevented from malfunctioning due to interference. In other words, the first position sensor 42a and the second position sensor 42b are protected based on the fact that the first position sensor 42a is installed in the first sensor mounting groove 40a and the second position sensor 42b is installed in the second sensor mounting groove 40b.

[0072] Next, the operator replaces the cylinder unit 14 with a spare part, for example. Specifically, the operator inserts the spare part that is an integral combination of the holder-side damper 76, the first holder 58, the second holder 30, the second damper 116, the piston rod 62, the piston 60, and the first damper 98 into the storage chamber 31 of the cylinder housing 12. At this time, the operator slides the spare part from the X2 direction to the X1 direction in a state where the holder-side damper 76 and the first holder 58 are oriented in the X1 direction. Since the sleeve 66 is prevented from interfering with the inner peripheral wall of the storage chamber 31, the sliding is also easy.

[0073] The operator then clamps a tool such as an adjustable wrench, a fixed wrench or pliers into the operating portion 146 of the second retaining frame 30. In this state, the operator rotates the tool so that the second threaded portion 32 is screwed into the first threaded portion 26. As a result, the cylinder unit 14 is connected (constrained) to the cylinder housing 12. In this way, in the present embodiment, the second opening 15b of the cylinder housing 12 becomes the mounting portion of the cylinder unit 14. That is, there is no need to mount the cylinder unit 14 on the cylinder housing 12 via any component. Therefore, there is no need to mount or remove any component when mounting or removing the cylinder unit 14 relative to the cylinder housing 12.

[0074] During the operation of separating the cylinder unit 14 from the cylinder housing 12 and the operation of installing the reserve product on the cylinder housing 12, the first position sensor 42a and the second position sensor 42b remain installed on the cylinder housing 12. Therefore, after the reserve product is stored in the storage chamber 31, the position of the first position sensor 42a or the second position sensor 42b matches the position of the piston 60. Therefore, there is no need to perform the alignment operation of the first position sensor 42a or the second position sensor 42b and the piston 60. In addition, there is no need to remove the cables 46a and 46b from the first position sensor 42a and the second position sensor 42b. For the above reasons, the maintenance operation is also simplified.

[0075] When the reserve is inserted into the storage chamber 31, a first annular gap 63 is formed between the first retainer 58 and the X2 side end surface of the circular plate portion 17 in the cover member 16. Here, a retainer side damper 76 is retained in the storage recess 71 of the first retainer 58. Here, a portion of the retainer side damper 76 protrudes from the storage recess 71 toward the circular plate portion 17. Therefore, in the retainer side damper 76, the portion protruding from the storage recess 71 abuts against the X2 side end surface of the circular plate portion 17. As a result, the first retainer 58 and the circular plate portion 17 are slightly separated. By this separation, the first annular gap 63 is reliably formed.

[0076] In this method, the first threaded portion 26 is screwed with the second threaded portion 32. Therefore, the cylinder unit 14 is relatively positioned and fixed to the cylinder housing 12. In other words, the cylinder unit 14 is prevented from being displaced in the axial direction (X direction) of the cylinder housing 12. Therefore, for example, the first retaining frame 58 is prevented from moving to a position that closes the first input / output port 54a. In addition, since the first retaining frame 58 stops at a predetermined position in the X direction, the first annular gap 63 is reliably formed.

[0077] Moreover, by screwing the first threaded portion 26 and the second threaded portion 32, it is also possible to avoid the piston rod 62 from being displaced in the Z direction. That is, the axis of the sleeve 66 (the axis of the piston chamber 68), the axis of the insertion hole 130, the axis of the piston rod 62, and the axis of the piston 60 are precisely consistent. Therefore, for example, it is avoided that the axis of the piston rod 62 is tilted relative to the axis of the insertion hole 130, and the piston 60 is tilted relative to the axis of the piston chamber 68. Therefore, by connecting the workpiece to the connecting hole 148, the workpiece and the piston rod 62 are centered. Thus, the workpiece can be mounted on the piston rod 62 in a specified posture. In this state, the workpiece moves integrally with the piston rod 62 as the piston rod 62 moves. That is, the workpiece can be moved along a predetermined movement trajectory.

[0078] After that, the user operates the cylinder 10 assembled with the spare parts. In this case, the cylinder 10 also operates in the same manner as described above. In this way, according to the present embodiment, by replacing the cylinder unit 14 with the spare parts, the maintenance of the cylinder 10 can be completed. That is, by using the spare parts, the maintenance of the cylinder 10 can be easily and in a short time. Therefore, the operation stop time of the specified equipment in which the cylinder 10 is installed can be shortened.

[0079] In addition, according to the present embodiment, when performing maintenance on the cylinder unit 14, it is not necessary to remove the first pipe joint 50a, the first supply and discharge pipe 56a, the second pipe joint 50b, the second supply and discharge pipe 56b, the first position sensor 42a, the second position sensor 42b, and the cables 46a, 46b from the cylinder housing 12. Therefore, the number of maintenance steps is reduced. In addition, the maintenance work becomes simple. That is, it is easy to perform maintenance on the cylinder 10.

[0080] In addition, it is also possible to perform maintenance on the cylinder unit 14 removed from the cylinder housing 12. In this case, the operator disassembles the cylinder unit 14. For example, the operator disengages the second engagement end 110 of the second retainer 30 from the sleeve 66. As a result, the second retainer 30, the piston rod 62, and the piston 60 are pulled out of the sleeve 66. The operator pulls out the piston rod 62 from the insertion hole 130. Thus, the second retainer 30 is removed from the piston rod 62. The operator further disengages the second damper 116 from the engagement recess 112.

[0081] Through the above process, the gasket 90 and the rod seal 134 are in a replaceable state. The operator replaces the gasket 90 and the rod seal 134 with new ones. As needed, the operator replaces the second shock absorber 116, the second unit seal 144 or the first shock absorber 98 with new ones. In addition, the retainer side shock absorber 76 and the first unit seal 65 can also be replaced with new ones. The operator then assembles the cylinder unit 14 in the reverse order of the above. When the maintenance period of the spare parts arrives, the operator replaces the spare parts and the cylinder unit 14 that has been maintained in the same way as above.

[0082] As described above, the present embodiment discloses a fluid pressure cylinder as follows, comprising: a cylinder housing 12, which is formed with a receiving chamber 31; and a cylinder unit 14, which is received in the receiving chamber in a pluggable manner, the cylinder housing having a first fixing unit and position sensors 42a, 42b, the cylinder unit having: a piston 60, which is pressed by a pressure fluid; a piston rod 62, which is provided with the piston; a sleeve 66, which is formed with a piston chamber 68 for sliding the piston; a first retaining frame 58, which holds one end of the sleeve; a second retaining frame 30, which holds the other end of the sleeve; and a second fixing unit, which can be engaged with the first fixing unit, and a through hole 130 for inserting the piston rod is formed in at least one of the first retaining frame and the second retaining frame, by engaging the first fixing unit with the second fixing unit, the cylinder unit is connected to the cylinder housing in a loadable and detachable manner, and the position of the position sensor matches the position of the piston.

[0083] The fluid pressure cylinder has a cylinder unit that is an integral assembly of a piston and a piston rod. The cylinder unit is accommodated in a housing chamber of a cylinder housing in a pluggable manner. Therefore, when the maintenance period of the cylinder unit comes, for example, the cylinder unit is replaced with a spare part. In this way, the fluid pressure cylinder can be operated again.

[0084] It can be understood from this that in the present embodiment, when replacing the cylinder unit with a spare part, there is no particular need to remove the cylinder housing from the equipment. In addition, there is no particular need to remove the position sensor and the wiring connected to the position sensor from the cylinder housing. That is, the operation in the case of performing maintenance on the fluid pressure cylinder typically only involves replacing the cylinder unit with a spare part. For the reasons described above, the maintenance operation process is reduced. In addition, the operation is simplified. That is, according to the present embodiment, the fluid pressure cylinder can be easily maintained in a short time. Therefore, the operation stop time of the equipment is shortened.

[0085] Moreover, the cylinder unit and the cylinder housing are connected based on the engagement of the first fixing unit and the second fixing unit. Therefore, it is easy to connect the cylinder unit and the cylinder housing. In addition, by releasing the engagement of the first fixing unit and the second fixing unit, the connection between the cylinder unit and the cylinder housing can be released. In this way, according to the above-mentioned structure, the cylinder unit can be easily installed and detached relative to the cylinder housing.

[0086] In addition, the installation position of the position sensor relative to the cylinder housing is the same before and after the cylinder unit is removed from the cylinder housing. Therefore, by inserting and installing the cylinder unit into the cylinder housing, the piston is located at a predetermined position to match the position of the position sensor. That is, the piston and the position sensor are aligned. In this way, even if the operator cannot visually confirm the piston, it is easy to align the piston and the position sensor.

[0087] This embodiment discloses a fluid pressure cylinder, wherein the first fixing unit is a first threaded portion 26 formed on the inner peripheral wall of the cylinder housing forming the accommodating chamber, and the second fixing unit is a second threaded portion 32 formed on the outer peripheral wall of the cylinder unit, and the first threaded portion is screwed with the second threaded portion.

[0088] In this case, the cylinder unit is connected to the cylinder housing via the first threaded portion and the second threaded portion. Therefore, by rotating the cylinder unit relative to the cylinder housing, it is easy to release the connection between the cylinder unit and the cylinder housing. Similarly, it is also easy to connect the cylinder unit to the cylinder housing. That is, according to this structure, the cylinder unit can be easily loaded and unloaded relative to the cylinder housing.

[0089] Moreover, in this case, the cylinder unit is sufficiently positioned and fixed relative to the cylinder housing. Thus, for example, the path of the compressed air is ensured. In addition, the piston rod and the piston are prevented from moving in an eccentric state relative to the piston chamber. Therefore, the workpiece can be moved integrally with the piston rod in a state in which it is in a predetermined posture relative to the piston rod.

[0090] This embodiment discloses a fluid pressure cylinder, in which a through hole 72 is formed in the first retainer, and the pressure fluid flows through the through hole to reach the piston.

[0091] Thus, by providing a through hole in the first retainer, the pressure fluid can be supplied to the piston accommodated inside the sleeve. Alternatively, the pressure fluid pushed out of the piston can be discharged to the outside of the sleeve through the through hole. In other words, by providing a through hole in the first retainer, the piston can be easily moved.

[0092] This embodiment discloses a fluid pressure cylinder, wherein the cylinder housing has a closing portion 16 that closes one axial end of the accommodating chamber, an annular gap 63 is formed between the first retaining frame and the closing portion, and the pressure fluid pressing the piston flows from the gap into the through hole.

[0093] In this case, one axial end of the receiving chamber of the cylinder housing is closed by the closing portion. In this structure, a gap connected to the through hole is preferably formed between the first retainer and the closing portion. Thus, the pressure fluid can be supplied and discharged to the piston accommodated in the sleeve through the gap and the through hole. That is, in this structure, the piston can also be easily moved.

[0094] The present embodiment discloses a fluid pressure cylinder, wherein an annular elastic component 76 is arranged between the first retaining frame and the closed portion, and the elastic component has: a hollow portion serving as a guide hole 82, which is connected to the piston chamber via the through hole of the first retaining frame and guides the pressure fluid; and a guide path 84, which connects the gap with the hollow portion.

[0095] When the piston moves toward the first retainer, it may abut against the first retainer. In this case, the first retainer may be pushed out by the piston and abut against the sealing portion. By providing an elastic component on the first retainer, the impact when the first retainer abuts against the sealing portion is alleviated.

[0096] In this case, it is preferred that a guide path and a guide hole are formed in the elastic member. According to this structure, even when the elastic member is in contact with the closed portion, the pressure fluid can be delivered from the gap to the guide hole via the guide path. The pressure fluid contacts the piston through the through hole of the first retainer. In this way, since the guide path and the guide hole are formed in the elastic member, the pressure fluid can be supplied to the piston even when the elastic member is in contact with the closed portion.

[0097] This embodiment discloses a fluid pressure cylinder, wherein the elastic member has an end surface 77 that abuts against the closing portion, and the guide path is a groove formed in the end surface.

[0098] By forming the guide path as a groove on the end surface of the elastic member, even when the end surface abuts against the closing portion, the guide path can be prevented from being closed. Therefore, the pressure fluid can be delivered to the passage hole via the guide path.

[0099] The present embodiment discloses a fluid pressure cylinder, wherein a first chamber 86 is formed between the piston and the first retaining frame, and the piston has an annular shock absorber 98 facing the first retaining frame, and the shock absorber has: an inlet and outlet hole 104, which is opposite to the through hole in the axial direction of the cylinder unit and allows the pressure fluid to flow; and an inlet and outlet path 106, which connects the inlet and outlet hole with the first chamber.

[0100] As described above, when the piston moves toward the first retainer, there is a possibility that the piston contacts the first retainer. By providing the damper on the piston, the impact when the piston contacts the first retainer is mitigated.

[0101] In this case, it is preferable to form an inlet and outlet path and an inlet and outlet hole in the shock absorber. According to this structure, even when the shock absorber is in contact with the first retaining frame, the pressure fluid passing through the through hole of the first retaining frame can be received by the inlet and outlet hole. In addition, the pressure fluid received by the inlet and outlet hole can be transported to the first chamber via the inlet and outlet path. As a result, the pressure fluid contacts the piston in the inlet and outlet hole and the first chamber.

[0102] That is, according to this structure, the pressure fluid contacts the piston in the inlet and outlet holes and the first chamber. In this case, the contact area of ​​the pressure fluid with the piston becomes larger than that of the pressure fluid contacting the piston only in the inlet and outlet holes. Therefore, the piston can be easily moved.

[0103] In a specific embodiment, the second fixing unit and the insertion hole are formed in the second retaining frame. That is, the present embodiment discloses a fluid pressure cylinder, wherein the cylinder housing has a closing portion 16 that closes one axial end of the accommodation chamber, the second retaining frame closes the other axial end of the accommodation chamber, and the second fixing unit and the insertion hole are formed in the second retaining frame.

[0104] In this way, a single-rod cylinder can be constructed. In addition, since the first threaded portion is located at one end of the cylinder housing and the second threaded portion is located at one end of the cylinder unit, it is easy to screw the first threaded portion relative to the second threaded portion.

[0105] This embodiment discloses a fluid pressure cylinder, wherein the second retainer has a damper 116 abutting against the piston and a flow path 136 for the pressure fluid to flow, and the damper has a supply and discharge hole 124 communicating with the flow path.

[0106] In this case, the pressure fluid can be supplied or discharged to or from the piston chamber via the supply and discharge hole and the flow path. Therefore, it is avoided that a flow path for the pressure fluid to flow is formed in the sleeve.

[0107] This embodiment discloses a fluid pressure cylinder, wherein the cylinder housing has: a first pipe joint 50a, which is connected to a first supply and discharge pipe 56a for supplying and discharging a pressure fluid; a first mounting hole 52a, which is provided for mounting the first pipe joint; a second pipe joint 50b, which is connected to a second supply and discharge pipe 56b for supplying and discharging the pressure fluid; and a second mounting hole 52b, which is provided for mounting the second pipe joint.

[0108] In this case, the cylinder unit can be separated from the cylinder housing while the first pipe joint and the second pipe joint are mounted on the cylinder housing. When the cylinder unit is maintained, it is not necessary to remove the first pipe joint, the first supply and exhaust pipe, the second pipe joint, the second supply and exhaust pipe, etc. from the cylinder housing. Therefore, it is easier to maintain the fluid pressure cylinder.

[0109] This embodiment discloses a fluid pressure cylinder, wherein the cylinder housing has sensor mounting grooves 40a and 40b for mounting the position sensor.

[0110] In this case, the position sensor is accommodated in the sensor mounting groove. Therefore, for example, when the fluid pressure cylinder is maintained, the position sensor is prevented from interfering with certain objects. In other words, the position sensor is protected.

[0111] In addition, the present invention is not limited to the above disclosure, and various structures can be adopted without departing from the gist of the present invention.

[0112] Explanation of symbols

[0113] 10...Cylinder 12...Cylinder housing

[0114] 14... cylinder unit 16... cover member

[0115] 26 ... first threaded portion 30 ... second retainer

[0116] 31 ... Accommodation chamber 32 ... Second threaded portion

[0117] 40a...first sensor installation slot 40b...second sensor installation slot

[0118] 42a ... first position sensor 42b ... second position sensor

[0119] 50a...first pipe joint 50b...second pipe joint

[0120] 52a...first mounting hole 52b...second mounting hole

[0121] 54a...first input / output port 54b...second input / output port

[0122] 56a...first supply and discharge pipe 56b...second supply and discharge pipe

[0123] 58…First retainer 60…Piston

[0124] 62...Piston rod 63...First annular gap

[0125] 65...First unit seal 66...Sleeve

[0126] 68 ... piston chamber 70 ... first engagement end

[0127] 72…Through hole 76…Vibration damper on cage side

[0128] 82...Guide hole 84...Guide path

[0129] 86 ... first chamber 90 ... liner

[0130] 92…Magnet 98…First vibration damper

[0131] 104…Manhole 106…Manhole

[0132] 110 ... second engaging end 116 ... second vibration damper

[0133] 124…Supply and discharge holes

[0134] 126 ... second annular gap 128 ... second chamber

[0135] 130 ... insertion hole 134 ... rod seal

[0136] 136 ... flow path 138 ... first path

[0137] 140 ... second passage 144 ... second unit seal

[0138] 146…Operation department.

Claims

1. A fluid pressure cylinder, characterized in that: The fluid pressure cylinder (10) comprises: A cylinder housing (12) having a receiving chamber (31); and a cylinder unit (14) which is accommodated in the accommodation chamber in a pluggable manner; The cylinder housing has a first fixing unit and a position sensor (42a, 42b), The cylinder unit has: a piston (60) pressed by a pressure fluid; a piston rod (62) provided with the piston; a sleeve (66) having a piston chamber (68) formed therein for the piston to slide; A first retainer (58) that retains one end of the sleeve; a second retainer (30) which retains the other end of the sleeve; and a second fixing unit, the second fixing unit being capable of engaging with the first fixing unit; An insertion hole (130) for inserting the piston rod is formed in at least one of the first retaining frame and the second retaining frame. By engaging the first fixing unit with the second fixing unit, the cylinder unit is detachably connected to the cylinder housing, and the position of the position sensor matches the position of the piston.

2. The fluid pressure cylinder according to claim 1, characterized in that: The first fixing unit is a first threaded portion (26) formed on the inner peripheral wall of the cylinder housing forming the accommodating chamber, and the second fixing unit is a second threaded portion (32) formed on the outer peripheral wall of the cylinder unit, and the first threaded portion is screwed with the second threaded portion.

3. The fluid pressure cylinder according to claim 1, characterized in that: A through hole (72) is formed in the first retainer, The pressure fluid flows through the through hole and reaches the piston.

4. The fluid pressure cylinder according to claim 3, characterized in that: The cylinder housing has a closing portion (16) that closes one axial end of the accommodating chamber. An annular gap (63) is formed between the first retaining frame and the closing portion. The pressure fluid pressing the piston flows from the gap into the through hole.

5. The fluid pressure cylinder according to claim 4, characterized in that: An annular elastic member (76) is provided between the first retaining frame and the closing portion. The elastic member has: a hollow portion as a guide hole (82), the guide hole being connected to the piston chamber via the through hole of the first retainer and guiding the pressure fluid; and a guide path (84) connecting the gap with the hollow portion.

6. The fluid pressure cylinder according to claim 5, characterized in that: The elastic member has an end surface (77) that abuts against the closing portion, and the guide path is a groove formed in the end surface.

7. The fluid pressure cylinder according to claim 3, characterized in that: A first chamber (86) is formed between the piston and the first retainer, and the piston has an annular damper (98) facing the first retainer. The shock absorber comprises: an inlet and outlet hole (104) which is opposite to the through hole in the axial direction of the cylinder unit and allows the pressure fluid to flow; and an inlet and outlet passage (106) which connects the inlet and outlet hole with the first chamber.

8. The fluid pressure cylinder according to claim 1, characterized in that: The cylinder housing has a closing portion (16) that closes one axial end of the accommodation chamber. The second holder closes the other axial end of the accommodation chamber, and the second fixing unit and the insertion hole are formed in the second holder.

9. The fluid pressure cylinder according to claim 8, characterized in that: The second retainer has: a shock absorber (116), the shock absorber abutting against the piston; and a flow passage (136) through which the pressure fluid flows. The vibration absorber has a supply and discharge hole (124) communicating with the flow passage.

10. The fluid pressure cylinder according to claim 1, characterized in that: The cylinder housing has: A first pipe joint (50a) connected to a first supply and discharge pipe (56a) for supplying and discharging a pressure fluid; a first mounting hole (52a), the first mounting hole being used for mounting the first pipe joint; a second pipe joint (50b) connected to a second supply and discharge pipe (56b) for supplying and discharging the pressure fluid; and A second mounting hole (52b), the second mounting hole is used for mounting the second pipe joint.

11. The fluid pressure cylinder according to any one of claims 1 to 10, characterized in that: The cylinder housing has a sensor mounting groove (40a, 40b) for mounting the position sensor.

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