A cylinder

Abstract

The utility model relates to the pneumatic field especially relates to a cylinder with stable response speed, through one of cylinder body and end cover has the protruding part in the circumferential side wall, the other of cylinder body and end cover has the recess in the circumferential side wall, at least part of protruding part is limited in recess, that is, the end cover and cylinder body are circumferentially limited and set, compared with the background art, avoid the circumferential relative rotation between end cover and cylinder body due to vibration, cause the mutual abrasion between end cover and cylinder body, avoid the gas leakage due to long -term abrasion, appear the condition that cylinder response slows down.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic technology, and in particular to a cylinder. Background Technology

[0002] In one technique, see Figure 11 As a pneumatic component, the cylinder drives the movement of other components through the movement of the piston assembly. The cylinder includes a cylinder body 12', a front cover 13', and a rear cover 14'. The front cover 13' and the rear cover 14' are respectively limited to the cylinder body 12' by snap rings 15'. After long-term use, the response speed of the piston assembly will slow down. Utility Model Content

[0003] In the background art, during the rapid movement of the piston shaft, the piston assembly impacts the front cover and / or the rear cover, causing relative rotation between the front cover and / or the rear cover and the cylinder. This circumferential relative rotation between the front cover and the cylinder, and / or the rear cover and the cylinder results in wear between the front cover and the cylinder, and / or between the rear cover and the cylinder, leading to air leakage between the front cover and the cylinder, and / or between the rear cover and the cylinder, thus slowing down the cylinder's response speed.

[0004] This invention provides a cylinder with a relatively stable response speed:

[0005] A cylinder includes a cylinder body, a piston assembly, and at least one end cap. A portion of the piston assembly is located inside the cylinder body and is slidable relative to the cylinder body. The end cap and the cylinder body are circumferentially limited. One of the cylinder body and the end cap has a protrusion located on a circumferential sidewall, and the other of the cylinder body and the end cap has a recess located on a circumferential sidewall, with at least a portion of the protrusion limited to the recess.

[0006] Such a cylinder, with one of the cylinder body and end cover having a protrusion located on the circumferential sidewall, and the other having a recess located on the circumferential sidewall, wherein at least part of the protrusion is confined to the recess, i.e., the end cover and cylinder body are circumferentially limited, compared with the prior art, avoids circumferential relative rotation between the end cover and cylinder body due to vibration, which would cause mutual wear between the end cover and cylinder body, and avoids gas leakage due to long-term wear, resulting in a slow cylinder response. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the explosion of the entire cylinder;

[0008] Figure 2 This is a side view schematic diagram of a cylinder according to one embodiment;

[0009] Figure 3 for Figure 2 A cross-sectional schematic diagram of an embodiment;

[0010] Figure 4 for Figure 2 An exploded view of the cylinder body, end cap, and first elastic element in the embodiment;

[0011] Figure 5 for Figure 2 A schematic diagram of the cylinder block in one embodiment;

[0012] Figure 6 for Figure 2 A schematic diagram of an end cap component according to one embodiment;

[0013] Figure 7 for Figure 2 A schematic diagram of the cylinder block in one embodiment;

[0014] Figure 8 A side view of a cylinder according to another embodiment;

[0015] Figure 9 for Figure 8 An exploded view of the cylinder body, end cap, and first elastic element in the embodiment;

[0016] Figure 10 for Figure 9 An illustration of the explosion from another perspective;

[0017] Figure 11 This is a cross-sectional schematic diagram of a cylinder used in the background technology.

[0018] Figure label:

[0019] Cylinder 1;

[0020] Cylinder body 11, first end 111, second end 112, first section 113, second section 114, connecting wall 115, first groove 116, first baffle 1161, second baffle 1162, part taking groove 117, part taking side opening 1171.

[0021] Piston assembly 12, piston shaft 121;

[0022] End cap 13, main body 131, third baffle 132, fourth baffle 133; mounting part 134;

[0023] Protrusion 14a;

[0024] Recessed portion 15a, recessed side opening 15a1, first recessed section 15a2, second recessed section 15a3;

[0025] First elastic element 2, wire retaining ring 2a, opening 21;

[0026] First plane 3;

[0027] Third limiting part 4, fifth baffle 41, sixth baffle 42.

[0028] Cylinder 1', Piston assembly 11', Piston shaft 111', Cylinder block 12', Front cover 13', Rear cover 14', Snap ring 15' Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0030] The specific implementation method is described below with reference to the accompanying drawings:

[0031] See Figures 1 to 10 A cylinder 1 includes a cylinder body 11 and a piston assembly 12. A portion of the piston assembly 12 is located inside the cylinder body 11. The direction of movement of the piston assembly 12 is defined as a first direction. The movement of the piston assembly 12 drives the movement of other components.

[0032] In the background art, see Figure 11 The cylinder includes a cylinder body 12', a piston assembly 11', a front cover 13', and a rear cover 14'. The front cover 13' and the rear cover 14' are respectively positioned relative to the cylinder body 12' by retaining rings 15'. At least a portion of the piston assembly 11' is located inside the cylinder body 12', and the piston rod 111' of the piston assembly 11' passes through the rear cover 14'. The retaining rings 15' are used to position the front cover 13' relative to the cylinder body 12', and / or the rear cover 14' relative to the cylinder body 12'. During prolonged use, a slower response may occur during the movement of the piston assembly 11'. During the rapid movement of the piston shaft 111', the piston assembly 11' impacts the front cover and / or the rear cover, causing relative rotation between the front cover and / or the rear cover and the cylinder 12'. This results in circumferential relative rotation between the front cover 13' and the cylinder 12', and / or between the rear cover 14' and the cylinder 12', leading to wear between the front cover 13' and the cylinder 12', and / or between the rear cover 14' and the cylinder 12'. This causes air leakage between the front cover and the cylinder 13' and the cylinder 12', and / or between the rear cover 14' and the cylinder 12', resulting in a slower cylinder response speed.

[0033] See Figures 1 to 10 In this invention, the cylinder 1 includes a cylinder body 11, a piston assembly 12, and at least one end cap 13. A portion of the piston assembly 12 is located inside the cylinder body 11, and the piston assembly 12 is slidable relative to the cylinder body 11. The end cap 13 is located at the end of the cylinder body 11. One of the cylinder body 11 and the end cap 13 has a protrusion 14a located on the peripheral sidewall, and the other of the cylinder body 11 and the end cap 13 has a recess 15a located on the peripheral sidewall. At least a portion of the protrusion 14a is located in the recess 15a.

[0034] Such a cylinder, with one of the cylinder body and end cover having a protrusion located on the circumferential sidewall, and the other having a recess located on the circumferential sidewall, wherein at least part of the protrusion is confined to the recess, i.e., the end cover and cylinder body are circumferentially limited, compared with the prior art, avoids circumferential relative rotation between the end cover and cylinder body due to vibration, which would cause mutual wear between the end cover and cylinder body, and avoids gas leakage due to long-term wear, resulting in a slow cylinder response.

[0035] In addition, the end cap and cylinder body are circumferentially limited. The end cap 13 has a mounting part 134 for installation to realize the installation of the cylinder. In the application scenario of the cylinder, it is necessary to limit the degree of freedom of the cylinder body 11 and the end cap 13 in the circumferential direction of the cylinder body 11 to avoid the cylinder body 11 rotating circumferentially relative to the end cap 13 and colliding with other parts in the application scenario, so as to ensure the application stability of the cylinder.

[0036] One of the cylinder body 11 and the end cap 13 has a protrusion 14a located on its peripheral sidewall, and the other has a recess 15a located on its peripheral sidewall. The recess 15a extends along a first direction, and at least a portion of the protrusion 14a is confined within the recess 15a. During the insertion of the end cap 13 into the cylinder body 11 along the first direction, the protrusion 14a enters the recess 15a along the first direction, achieving circumferential positioning of the cylinder body and the end cap. In some technologies, the end cap and cylinder body are positioned by circumferential riveting, requiring the end cap to be placed inside the cylinder body first, and then positioned by press riveting. This process is more complex and prone to inaccurate positioning. In this embodiment, during the insertion of the end cap 13 into the cylinder body 11 along the first direction, the protrusion 14a enters the recess 15a along the first direction, achieving circumferential positioning of the cylinder body and the end cap.

[0037] It should be noted that the cylinder 1 includes at least one end cover 13, which can be a front cover 13a and / or a rear cover 13b. The piston assembly 12 includes a piston shaft 121, which passes through the rear cover 13b. In this utility model, the end cover 13 is described in detail as the front cover 13a. Of course, as in other embodiments, the end cover 13 can also be the rear cover 13b, which will not be elaborated here.

[0038] In one embodiment, see Figures 1 to 7The end cap 13 has a main body 131 and a protrusion 14a. At least a portion of the main body 131 is located inside the cylinder body 11. The main body 131 and the inner wall of the cylinder body 11 are fitted together. The cylinder body 11 has a recess 15a. The protrusion 14a protrudes from the peripheral wall of the main body 131 toward the direction close to the cylinder body 11. The recess 15a is recessed from the inner wall of the cylinder body 11 toward the direction away from the main body 131. At least a portion of the protrusion 14a is located in the recess 15a. Thus, the cylinder body 11 and the end cap 13 are limited in the circumferential direction of the cylinder body 11. Specifically, the cylinder body 11 can be made of metal. The cylinder body 11 has a recessed portion 15a. The blank can be drawn first to generate a process part with holes. The recessed portion 15a is formed by drilling along the first direction on the inner wall of the process part, which is convenient for processing. If the cylinder body 11 has a protrusion, the cylinder body needs to be formed by multiple machining operations on the metal block, making it more difficult to process the protrusion located on the inner wall of the cylinder body.

[0039] Specifically, along the first direction, the cylinder body 11 has a first end 111 and a second end 112. Along the first direction, compared to the second end 112, the end cap 13 is closer to the first end 111. The recessed portion 15a has a recessed side opening 15a1, which is located on the end wall surface of the first end 111. It can be drilled from the first end 111 along the first direction by machining, making the machining more convenient. In addition, during the assembly of the end cap and the cylinder body, part of the end cap enters the inner side of the cylinder body along the first direction, and the protrusion enters the recessed portion through the recessed side opening.

[0040] The inner wall of the cylinder body 11 includes a first section 113 and a second section 114. The diameter of the first section 113 is smaller than the diameter of the second section 114. A connecting wall 115 is provided between the first section 113 and the second section 114. The second section 114 extends from the connecting wall 115 along a first direction. The connecting wall 115 restricts one degree of freedom of the main body 131 along the first direction, thereby realizing one degree of freedom of the end cap 13 in the first direction. The cylinder body 11 has a first groove 116, which extends circumferentially along the inner wall of the cylinder body 11. The groove of the first groove 116 is recessed from the inner wall of the cylinder body 11 toward the thickness direction of the corresponding wall portion of the cylinder body 11. The cylinder includes a first elastic member 2, a portion of which is confined within the groove of the first groove 116. Along the first direction, at least a portion of the main body 131 is confined between the connecting wall 115 and the first elastic member 2, thereby realizing relative movement between the end cap 13 and the cylinder body 11.

[0041] The recessed portion 15a includes at least two segments: a first recessed segment 15a2 and a second recessed segment 15a3. Along the first direction, the first recessed segment 15a2 and the second recessed segment 15a3 are located on opposite sides of the first groove portion 116. Along the first direction, the second recessed segment 15a3 is closer to the first end portion 111 than the first recessed segment 15a2. The recessed side opening 15a1 is located in the second recessed segment 15a3. Furthermore, during the assembly of the end cap and the cylinder body, a portion of the end cap enters the inner side of the cylinder body along the first direction, and the protrusion enters the first recessed segment 15a2 through the recessed side opening, achieving circumferential positioning of the end cap and the cylinder body. (See also...) Figure 2 In the projection along the first direction, part of the outer edge wall of the first elastic member 2 is located inside the recess 15a. During disassembly, it is convenient for the tool to penetrate between the outer edge of the first elastic member 2 and the wall of the recess side opening 15a1 along the first direction, so that the first elastic member 2 can be removed and disassembled. More specifically, the first elastic member 2 can be an elastic retaining ring or a wire retaining ring 2a.

[0042] The number of recesses 15a is at least two. The piston assembly 12 includes a piston shaft 121, defining a first plane 3. The axis of the piston shaft 121 is located on the first plane 3, and the first elastic member 2 is symmetrical about the first plane 3. At least two recesses 15a are located on both sides of the first plane 3. Thus, the number of recesses 15a is at least two. When disassembling the first elastic member 2, a tool can be inserted simultaneously between the walls of the two recesses 15a and the walls of the first elastic member 2, causing the first elastic member 2 to deform until the equivalent diameter of the outer edge of the first elastic member 2 is smaller than the diameter of the first groove 116, until the first elastic member 2 is removed from the first groove 116.

[0043] For more details, see Figures 5 to 7 During the use of cylinder 1, the movement of piston assembly 12 causes cylinder 1 to vibrate. With prolonged use, this can cause the first elastic element 2 to rotate. Specifically, the wire retaining ring 2a or the elastic retaining ring will rotate circumferentially around cylinder body 11, meaning the position of the opening 21 of the first elastic element 2 will change. If, in the projection in the first direction, the wall of the recessed side opening 15a1 is within the opening 21 of the first elastic element 2, then the recessed opening 21 cannot facilitate the disassembly of the first elastic element 2. Therefore, in this embodiment, a circumferential limiting structure for the first elastic element 2 is added, the specific structure of which is as follows:

[0044] In the circumferential direction of the inner wall of the cylinder body 11, the first groove 116 has a first baffle 1161 and a second baffle 1162. The first elastic member 2 is a wire retaining ring 2a or an elastic retaining ring. The first baffle 1161 and the second baffle 1162 are located at the opening 21 between the two end walls of the first elastic member 2. Along the extending direction of the first groove 116, the first baffle 1161 and the second baffle 1162 have gaps with the two end walls of the first elastic member 2, respectively, to ensure that the first elastic member 2 can deform during disassembly. In this way, the rotation of the first elastic member 2 within a certain range in the circumferential direction of the inner wall of the cylinder body 11 can be restricted. However, within this range of rotation, it is always ensured that the projection along the first direction, the portion of the outer edge of the first elastic member 2 can always be located inside the inner wall of the recess 15a. This facilitates subsequent disassembly.

[0045] Alternatively, the end cap 13 includes a third retaining wall 132 and a fourth retaining wall 133. The first elastic member 2 is a wire retaining ring 2a or an elastic retaining ring. The third retaining wall 132 and the fourth retaining wall 133 protrude from the main body 131 along the first direction. The third retaining wall 132 and the fourth retaining wall 133 are located at the opening 21 between the two end walls of the first elastic member 2. Along the extension direction of the first groove 116, the third retaining wall 132 and the fourth retaining wall 133 have gaps with the two end walls of the first elastic member 2, ensuring that the first elastic member 2 can deform during disassembly. In this way, the rotation of the first elastic member 2 within a certain range of circumference on the inner wall of the cylinder 11 can be restricted. However, within this range of rotation, the projection along the first direction is always ensured, and the portion of the outer edge of the first elastic member 2 can always be located inside the inner wall of the recess 15a, which is convenient for subsequent disassembly. Furthermore, in this embodiment, when machining the first groove 116, a complete annular groove can be machined, which is convenient for machining.

[0046] Of course, a limiting part can also be added to the groove. For example, the cylinder includes a third limiting part 4, which is located in the first groove 116. The third limiting part 4 and the first groove 116 can be welded together or the first groove 116 and the third limiting part 4 can be press-fitted together. The third limiting part 4 has a fifth baffle 41 and a sixth baffle 42. The fifth baffle 41 and the sixth baffle 42 are located in the opening 21 between the two end walls of the first elastic member 2. Along the extension direction of the first groove 116, the fifth baffle 41 and the sixth baffle 42 have gaps with the two end walls of the first elastic member 2, respectively, to ensure that the first elastic member 2 can deform during disassembly. In this way, the first elastic member 2 can be restricted to rotate within a certain range in the circumferential direction of the inner wall of the cylinder body 11. However, within this range of rotation, the projection along the first direction is always ensured. The portion of the wall of the outer edge of the first elastic member 2 can always be located inside the inner wall of the recess 15a, which is convenient for subsequent disassembly.

[0047] In one embodiment, see Figure 1 , Figures 8 to 10The end cap 13 has a main body 131 and a recessed portion 15a. The cylinder body 11 includes a protrusion 14a. At least a portion of the main body 131 is located inside the cylinder body 11, and the main body 131 and the inner wall of the cylinder body 11 are fitted together. The protrusion 14a protrudes from the inner wall of the cylinder body 11 toward the main body 131, and the recessed portion 15a is recessed from the peripheral wall of the main body 131 toward a direction away from the inner wall of the cylinder body 11. At least a portion of the protrusion 14a is located in the recessed portion 15a. In this way, the cylinder body 11 and the end cap 13 are limited in the circumference of the cylinder body 11. Specifically, the material of the cylinder body 11 can be plastic, and the cylinder body 11 can be formed by one-piece injection molding. If the cylinder body 11 is made of metal, it is more difficult to machine the protrusion 14a on the inner wall of the cylinder body 11 by machining. If the cylinder body 11 is made of plastic, it is easier to process by one-piece molding.

[0048] The inner wall of the cylinder body 11 includes a first section 113 and a second section 114. The diameter of the first section 113 is smaller than the diameter of the second section 114. A connecting wall 115 is provided between the first section 113 and the second section 114. The second section 114 extends from the connecting wall 115 along a first direction. The connecting wall 115 restricts one degree of freedom of the main body 131 along the first direction, thereby realizing one degree of freedom of the end cap 13 in the first direction. The cylinder body 11 has a first groove 116, which extends circumferentially along the inner wall of the cylinder body 11. The groove of the first groove 116 is recessed from the inner wall of the cylinder body 11 toward the thickness direction of the corresponding wall portion of the cylinder body 11. The cylinder includes a first elastic member 2, a portion of which is confined within the groove of the first groove 116. Along the first direction, at least a portion of the main body 131 is confined between the connecting wall 115 and the first elastic member 2, thereby realizing relative movement between the end cap 13 and the cylinder body 11.

[0049] The cylinder body 11 has a part-taking groove 117. The groove of the part-taking groove 117 is recessed from the inner wall of the cylinder body 11 along the thickness direction of the cylinder body 11. The part-taking groove 117 extends along a first direction. The cylinder body 11 has a first end 111 and a second end 112. Along the first direction, the end cap 13 is closer to the first end 111 than the second end 112. Along the first direction, one port of the part-taking groove 117 is a part-taking side opening 1171, which is located at the first end 111. The other port of the part-taking groove 117 is located on the wall of the first groove 116. In the projection along the first direction, at least a portion of the outer edge wall of the first elastic member 2 is located inside the part-taking groove 117. During disassembly, it is convenient for the tool to penetrate between the outer edge of the first elastic member 2 and the wall of the part-taking groove 117 along the first direction to remove the first elastic member 2. More specifically, the first elastic member 2 can be an elastic retaining ring (not shown in the figure) or a wire retaining ring 2a.

[0050] See Figure 8The number of take-up slots 117 is at least two. The piston assembly 12 includes a piston shaft 121, defining a first plane 3. The axis of the piston shaft 121 is located in the first plane 3, and the first elastic member 2 is symmetrical about the first plane 3. At least two take-up slots 117 are located on both sides of the first plane 3. Thus, the number of take-up slots 117 is at least two. When disassembling the first elastic member 2, a tool can be inserted simultaneously into the walls of the two take-up slots 117 between the walls of the first elastic member 2, so that the first elastic member 2 deforms until the equivalent diameter of the outer edge of the first elastic member 2 is less than the diameter of the first slot 116, until the first elastic member 2 is removed from the first slot 116.

[0051] More specifically, during the use of cylinder 1, the movement of piston assembly 12 causes cylinder 1 to vibrate. With prolonged use, this can cause the first elastic element 2 to rotate. Specifically, the wire retaining ring 2a or the elastic retaining ring will rotate circumferentially around cylinder body 11. That is, the position of the opening 21 of the first elastic element 2 will change. If, in the projection in the first direction, the wall of the recessed side opening 15a1 is within the opening 21 of the first elastic element 2, then the recessed opening 21 cannot facilitate the disassembly of the first elastic element 2. Therefore, in this embodiment, a circumferential limiting structure for the first elastic element 2 is added, the specific structure of which is as follows:

[0052] The following structure and the first elastic element 2 in the above embodiments cooperate in the same way with the first baffle 1161, the second baffle 1162, the third baffle 132, the fourth baffle 133, the fifth baffle 41, and the sixth baffle 42. For details, please refer to [link / reference needed]. Figures 5 to 7 .

[0053] In the circumferential direction of the inner wall of the cylinder body 11, the first groove 116 has a first baffle 1161 and a second baffle 1162. The first elastic member 2 is a wire retaining ring 2a or an elastic retaining ring. The first baffle 1161 and the second baffle 1162 are located at the opening 21 between the two end walls of the first elastic member 2. Along the extending direction of the first groove 116, the first baffle 1161 and the second baffle 1162 have gaps with the two end walls of the first elastic member 2, respectively, to ensure that the first elastic member 2 can deform during disassembly. In this way, the rotation of the first elastic member 2 within a certain range in the circumferential direction of the inner wall of the cylinder body 11 can be restricted. However, within this range of rotation, it is always ensured that the projection along the first direction, the portion of the outer edge of the first elastic member 2 can always be located inside the inner wall of the recess 15a. This facilitates subsequent disassembly.

[0054] Alternatively, the end cap 13 includes a third retaining wall 132 and a fourth retaining wall 133. The first elastic member 2 is a wire retaining ring 2a or an elastic retaining ring. The third retaining wall 132 and the fourth retaining wall 133 protrude from the main body 131 along the first direction. The third retaining wall 132 and the fourth retaining wall 133 are located at the opening 21 between the two end walls of the first elastic member 2. Along the extension direction of the first groove 116, the third retaining wall 132 and the fourth retaining wall 133 have gaps with the two end walls of the first elastic member 2, ensuring that the first elastic member 2 can deform during disassembly. In this way, the rotation of the first elastic member 2 within a certain range of circumference on the inner wall of the cylinder 11 can be restricted. However, within this range of rotation, the projection along the first direction is always ensured, and the portion of the outer edge of the first elastic member 2 can always be located inside the inner wall of the recess 15a, which is convenient for subsequent disassembly. Furthermore, in this embodiment, when machining the first groove 116, a complete annular groove can be machined, which is convenient for machining.

[0055] Of course, a limiting part can also be added to the groove. For example, the cylinder includes a third limiting part 4, which is located in the first groove 116. The third limiting part 4 and the first groove 116 can be welded together or the first groove 116 and the third limiting part 4 can be press-fitted together. The third limiting part 4 has a fifth baffle 41 and a sixth baffle 42. The fifth baffle 41 and the sixth baffle 42 are located in the opening 21 between the two end walls of the first elastic member 2. Along the extension direction of the first groove 116, the fifth baffle 41 and the sixth baffle 42 have gaps with the two end walls of the first elastic member 2, respectively, to ensure that the first elastic member 2 can deform during disassembly. In this way, the first elastic member 2 can be restricted to rotate within a certain range in the circumferential direction of the inner wall of the cylinder body 11. However, within this range of rotation, the projection along the first direction is always ensured. The portion of the wall of the outer edge of the first elastic member 2 can always be located inside the inner wall of the recess 15a, which is convenient for subsequent disassembly.

Claims

1. A cylinder (1), characterized in that, The cylinder (1) includes a cylinder body (11), a piston assembly (12) and at least one end cap (13), a portion of the piston assembly (12) being located inside the cylinder body (11), the piston assembly (12) being slidable relative to the cylinder body (11), the end cap (13) and the cylinder body (11) being circumferentially limited, one of the cylinder body (11) and the end cap (13) having a protrusion (14a) located on a circumferential sidewall, the other of the cylinder body (11) and the end cap (13) having a recess (15a) located on a circumferential sidewall, at least a portion of the protrusion (14a) being limited to the recess (15a).

2. The cylinder (1) according to claim 1, characterized in that, The end cap (13) has a main body (131) and the protrusion (14a). At least a portion of the main body (131) is located inside the cylinder (11). The main body (131) and the inner wall of the cylinder (11) are fitted together. The cylinder (11) has the recess (15a). The protrusion (14a) protrudes from the peripheral wall of the main body (131) toward the direction close to the cylinder (11). The recess (15a) is recessed from the inner wall of the cylinder (11) toward the direction away from the main body (131).

3. The cylinder (1) according to claim 2, characterized in that, The piston assembly (12) is defined as moving in a first direction; along the first direction, the cylinder (11) has a first end (111) and a second end (112); along the first direction, the end cap (13) is closer to the first end (111) than the second end (112); the recess (15a) has a recessed side opening (15a1) located on the end wall surface of the first end (111).

4. The cylinder (1) according to claim 3, characterized in that, The recessed portion (15a) includes at least two segments, namely a first recessed segment (15a2) and a second recessed segment (15a3). Along the first direction, the second recessed segment (15a3) is closer to the first end (111) than the first recessed segment (15a2). The recessed side opening (15a1) is a port of the second recessed segment (15a3).

5. The cylinder (1) according to claim 4, characterized in that, The inner wall of the cylinder (11) includes a first section (113) and a second section (114), the diameter of the first section (113) is smaller than the diameter of the second section (114), a connecting wall (115) is provided between the first section (113) and the second section (114), the second section (114) extends from the connecting wall (115) along the first direction, and the connecting wall (115) restricts one degree of freedom of the main body (131) along the first direction.

6. The cylinder (1) according to claim 5, characterized in that, The cylinder body (11) has a first groove (116) that extends circumferentially along the inner wall of the cylinder body (11). The groove of the first groove (116) is recessed from the inner wall of the cylinder body (11) toward the thickness direction of the corresponding wall portion of the cylinder body (11). The cylinder includes a first elastic member (2) that is partially located in the groove of the first groove (116). Along the first direction, the main body (131) is located between the connecting wall (115) and the first elastic member (2).

7. The cylinder (1) according to claim 6, characterized in that, Along the first direction, the first recessed section (15a2) and the second recessed section (15a3) are located on both sides of the first groove (116).

8. The cylinder (1) according to claim 1, characterized in that, The end cap (13) has a main body (131) and a recess (15a). The cylinder (11) includes a protrusion (14a). At least a portion of the main body (131) is located inside the cylinder (11), and the main body (131) and the inner wall of the cylinder (11) are engaged. The protrusion (14a) protrudes from the inner wall of the cylinder (11) toward the main body (131), and the recess (15a) is recessed from the peripheral wall of the main body (131) toward the direction away from the inner wall of the cylinder (11).

9. The cylinder (1) according to claim 8, characterized in that, Defined as follows: the moving direction of the piston assembly (12) is a first direction; the inner wall of the cylinder (11) includes a first section (113) and a second section (114); the aperture of the first section (113) is smaller than the aperture of the second section (114); a connecting wall (115) is provided between the first section (113) and the second section (114); the second section (114) extends from the connecting wall (115) along the first direction; the main body (131) and the second section (114) cooperate; and the connecting wall (115) restricts one degree of freedom of the main body (131) along the first direction.

10. The cylinder (1) according to claim 9, characterized in that, The cylinder body (11) has a first groove (116) that extends circumferentially along the inner wall of the cylinder body (11). The groove of the first groove (116) is recessed from the inner wall of the cylinder body (11) toward the thickness direction of the corresponding wall portion of the cylinder body (11). The cylinder includes a first elastic member (2) that is partially confined in the groove of the first groove (116). Along the first direction, at least a portion of the main body (131) is confined between the connecting wall (115) and the first elastic member (2).

11. The cylinder (1) according to claim 10, characterized in that, The cylinder (11) has a part-taking groove (117), the groove of the part-taking groove (117) is recessed from the inner wall of the cylinder (11) along the thickness direction of the cylinder (11), the part-taking groove (117) extends along the first direction, the cylinder (11) has a first end (111) and a second end (112), along the first direction, the end cap (13) is closer to the first end (111) than the second end (112), along the first direction, one port of the part-taking groove (117) is a part-taking side port (1171), the part-taking side port (1171) is located on the end wall surface of the first end (111), and the other port of the part-taking groove (117) is located on the wall of the first groove (116).

12. The cylinder (1) according to claim 7 or 11, characterized in that, In the projection along the first direction, at least a portion of the outer edge wall of the first elastic member (2) is located inside the recess (15a), or at least a portion of the outer edge wall of the first elastic member (2) is located inside the take-up groove (117).

13. The cylinder (1) according to claim 12, characterized in that, The number of the recesses (15a) is at least two, the piston assembly (12) includes a piston shaft (121), which is defined as a first plane (3), the axis of the piston shaft (121) is located on the first plane (3), and the first elastic member (2) is symmetrical about the first plane (3), and the at least two recesses (15a) are located on both sides of the first plane (3); or, the number of the take-up slots (117) is at least two, the piston assembly (12) includes a piston shaft (121), which is defined as a first plane (3), the axis of the piston shaft (121) is located on the first plane (3), and the first elastic member (2) is symmetrical about the first plane (3), and the at least two take-up slots (117) are located on both sides of the first plane (3).

14. The cylinder (1) according to claim 13, characterized in that, The first groove (116) has a first baffle (1161) and a second baffle (1162). The first elastic member (2) is a wire retaining ring (2a) or an elastic retaining ring. The first baffle (1161) and the second baffle (1162) are located at the opening (21) between the two end walls of the first elastic member (2). Along the extension direction of the first groove (116), the first baffle (1161) and the second baffle (1162) have gaps with the two end walls of the first elastic member (2); or the end cap (13) includes a third baffle (132) and a fourth baffle (133). The first elastic member (2) is a wire retaining ring (2a) or an elastic retaining ring. The third baffle (132) and the fourth baffle (133) protrude from the main body (131) along the first direction. 2) The fourth baffle (133) is located in the opening (21) between the two end walls of the first elastic member (2). Along the extension direction of the first groove (116), the third baffle (132) and the fourth baffle (133) have gaps between them and the two end walls of the first elastic member (2); or, the cylinder includes a third limiting part (4), which is located in the first groove (116), and the third limiting part (4) has a fifth baffle (41) and a sixth baffle (42). The fifth baffle (41) and the sixth baffle (42) are located in the opening (21) between the two end walls of the first elastic member (2). Along the extension direction of the first groove (116), the fifth baffle (41) and the sixth baffle (42) have gaps between them and the two end walls of the first elastic member (2).

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