A cylinder

Abstract

The air cylinder provided by the utility model, the air cylinder comprises a cylinder body, a first shaft and a piston piece, the outer peripheral wall of the piston piece is matched with the inner peripheral wall of the cylinder body, the face perpendicular to the axis of the first shaft is defined as a first face, the line intersecting the outer peripheral wall of the piston piece on the first face is defined as a first line, the first face is defined as having a first point, the first point is located on the axis of the first shaft, the first line is defined as having a second point and a third point, the distance between the first point and the second point is L1, the distance between the first point and the third point is L2, L1≠L2, when the piston piece moves, the rotation of the piston piece can be limited through the inner peripheral wall of the cylinder body, and the risk of air leakage in the air cylinder is reduced.

Description

Technical Field

[0001] This utility model relates to the field of drive technology, and more specifically, to a cylinder. Background Technology

[0002] A cylinder includes a cylinder body, a front end cover, and a rear end cover. The front end cover is located at one end of the cylinder body, and the rear end cover is located at the other end of the cylinder body. The cylinder includes a piston, rollers, and a rotating shaft. The piston is sleeved on the rotating shaft, and the rollers are rotatably mounted on the piston. There are two rollers, which are clamped on opposite sides of the rotating shaft. The outer wall of the rotating shaft is provided with a helical groove, and the rollers are located in the helical groove. The cylinder includes a first support rod and a second support rod, which are located on opposite sides of the rotating shaft. The first support rod passes through the piston, and the second support rod passes through the piston. The two ends of the first support rod are connected to the front end cover by screws, and the two ends of the second support rod are connected to the rear end cover by screws. The piston moves between the front end cover and the rear end cover under the push of gas. Because the first support rod and the second support rod pass through the piston, the piston only moves and does not rotate. The rotating shaft rotates due to the cooperation of the rollers and the helical groove.

[0003] Because the piston rotation is restricted by the first and second support rods passing through it, in order to reduce the amount of gas on one side of the piston flowing to the other side of the piston through the gap between the piston and the first and second support members during cylinder operation, that is, to reduce internal leakage of the cylinder, both the first and second support members are fitted with sealing elements to seal the gap between the first and second support members and the piston. However, since the piston needs to move relative to the first and second support members, the internal leakage of the cylinder needs to be further reduced. Utility Model Content

[0004] This utility model provides a cylinder, which includes a cylinder body, a first shaft, and a piston assembly. The piston assembly includes a piston member and a first member. The outer peripheral wall of the piston member is adapted to the inner peripheral wall of the cylinder body. The piston member has a first mounting cavity. The first member is rotatably disposed in the first mounting cavity. The piston member is sleeved on the first shaft. The first shaft has a helical slide. A portion of the first member cooperates with the helical slide. Defined as a surface perpendicular to the axis of the first shaft, the line intersecting the first surface with the outer peripheral wall of the piston member is a first line. Defined as a first point on the first surface, the first point being located on the axis of the first shaft. Defined as a second point and a third point on the first line, the distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, where L1 ≠ L2.

[0005] The cylinder provided by this utility model includes a cylinder body, a first shaft, and a piston. The outer peripheral wall of the piston is adapted to the inner peripheral wall of the cylinder body. A surface perpendicular to the axis of the first shaft is defined as a first surface, and the line intersecting the first surface with the outer peripheral wall of the piston is defined as a first line. The first surface is defined to have a first point located on the axis of the first shaft. The first line is defined to have a second point and a third point. The distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, where L1 ≠ L2. When the piston moves, the rotation of the piston can be restricted by the inner peripheral wall of the cylinder body, reducing the risk of internal leakage in the cylinder. Attached Figure Description

[0006] Figure 1 This is a three-dimensional structural diagram of an embodiment of the cylinder of this utility model;

[0007] Figure 2 for Figure 1 A cross-sectional view of the piston in the first position of the middle cylinder;

[0008] Figure 3 for Figure 2 Cross-sectional view along the AA direction;

[0009] Figure 4 for Figure 2 A partial schematic diagram of part A in the middle;

[0010] Figure 5 for Figure 2 A partial schematic diagram of section B;

[0011] Figure 6 for Figure 2 A partial schematic diagram of section C;

[0012] Figure 7 for Figure 3 A partial schematic diagram of section D;

[0013] Figure 8 for Figure 1 Another cross-sectional view of the middle cylinder;

[0014] Figure 9 for Figure 8 A cross-sectional view of the piston in the middle cylinder in the second position.

[0015] Figure label:

[0016] Cylinder body 1, first mating part 11, first intermediate part 12, second intermediate part 13, second mating part 14.

[0017] First cover 21, first mounting part 211, first fixing part 212, first external interface 213

[0018] First shaft 3, spiral slide 31, first spiral section 32, first support section 33, second support section 34.

[0019] Piston component 51, first mounting cavity 511, first sliding part 512, first connecting part 513, second sliding part 514, first mounting groove 515, first piece 52, first seal 53, first mounting sleeve 54, first bearing 55, first retaining ring 56, second piece 57, first main body part 571, first protrusion 572, second protrusion 573, second seal 58, fourth piece 60.

[0020] Second cover 61, second mounting part 611, second fixing part 612, second external interface 613.

[0021] First line 7, first connecting rod 8, third piece 9, fourth seal 10, fifth seal 20, sixth seal 30. Detailed Implementation

[0022] The technical solution of the specific implementation method is described below with reference to the accompanying drawings.

[0023] It should be noted that although this specification has described the present utility model with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the present utility model.

[0024] refer to Figures 1-3 A cylinder includes a cylinder body 1, a first shaft 3, and a piston assembly. The piston assembly includes a piston member 51 and a first member 52. The outer peripheral wall of the piston member 51 is adapted to the inner peripheral wall of the cylinder body 1. The piston member 51 has a first mounting cavity 511. The first member 52 is rotatably disposed in the first mounting cavity 511. The piston member 51 is sleeved on the first shaft 3. The first shaft 3 has a spiral slide 31. A portion of the first member 52 cooperates with the spiral slide 31. A surface perpendicular to the axis of the first shaft 3 is defined as a first surface. The line intersecting the first surface with the outer peripheral wall of the piston member 51 is defined as a first line 7. The first surface has a first point located on the axis of the first shaft 3. The first line 7 has a second point and a third point. The distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, where L1 ≠ L2.

[0025] The cylinder provided by this utility model includes a cylinder body 1, a first shaft 3, and a piston 51. The outer peripheral wall of the piston 51 is adapted to the inner peripheral wall of the cylinder body 1. The surface perpendicular to the axis of the first shaft 3 is defined as the first surface, and the line intersecting the first surface with the outer peripheral wall of the piston 51 is defined as the first line 7. The first surface is defined to have a first point located on the axis of the first shaft 3. The first line 7 is defined to have a second point and a third point. The distance between the first point and the second point is L1, and the distance between the first point and the third point is L2, where L1 ≠ L2. When the piston 51 moves, the rotation of the piston 51 can be restricted by the inner peripheral wall of the cylinder body 1, reducing the risk of internal leakage of the cylinder and reducing the risk of piston rod jamming or getting stuck.

[0026] refer to Figure 3 and Figure 7 The first part 52 is cylindrical. The piston assembly includes a first mounting sleeve 54, a first bearing 55, a first retaining ring 56, a second mounting sleeve, a second bearing, and a second retaining ring. The first bearing 55 is sleeved on one end of the first part 52, and the first mounting sleeve 54 is sleeved on the first bearing 55. The piston part 51 has a first groove, and a portion of the first retaining ring 56 is located in the first groove. The first retaining ring 56 is located on the side of the first mounting sleeve 54 opposite to the second mounting sleeve. The second bearing is sleeved on the other end of the first part 52, and the second mounting sleeve is sleeved on the second bearing. The piston part 51 has a second groove, and a portion of the second retaining ring is located in the second groove. The second retaining ring is located on the side of the second mounting sleeve opposite to the first mounting sleeve 54. The first part 52 is rotatable.

[0027] refer to Figure 3 and Figure 8 There are two first pieces 52, which are symmetrically arranged on both sides of the first axis 3. This will not be elaborated here.

[0028] refer to Figure 1 and Figure 2The cylinder includes a first end cap assembly, which includes a first cover 21 located at one end of the cylinder body 1. The first cover 21 includes a first mounting portion 211 and a first fixing portion 212. The first mounting portion 211 protrudes from the first fixing portion 212. One end of the cylinder body 1 is fitted onto the first mounting portion 211, and the cylinder body 1 and the first mounting portion 211 are sealed together. One end of the cylinder body 1 abuts against the first fixing portion 212. The cylinder also includes a second end cap assembly, which includes a second cover 61 located at the other end of the cylinder body 1. A first shaft 3 passes through the second cover. 61. The second cover 61 includes a second mounting part 611 and a second fixing part 612. The second mounting part 611 protrudes from the second fixing part 612. The other end of the cylinder body 1 is sleeved on the second mounting part 611. The other end of the cylinder body 1 is sealed to the second mounting part 611. The other end of the cylinder body 1 abuts against the second fixing part 612. The cylinder includes a first connecting rod 8. One end of the first connecting rod 8 is connected to the first fixing part 212. The other end of the first connecting rod 8 is connected to the second fixing part 612, thereby limiting the first cover 21 and the second cover 61 to the two ends of the cylinder body 1.

[0029] Optionally, there are four first connecting rods 8, which are distributed around the outer periphery of the cylinder body 1. The first connecting rods 8 can be connected to the first fixing part 212 and the second fixing part 612 by screws.

[0030] refer to Figure 2 The first end cap assembly includes a first external interface 213 and a first flow port. The first external interface 213 communicates with the first flow port, which is located on one side of the piston 51. The second end cap assembly includes a second external interface 613 and a second flow port, which is located on the other side of the piston 51. When the cylinder is working, for example, during the process of the cylinder moving from the first position (described below) to the second position (described below), the first external interface 213 is equivalent to a gas inlet. Gas enters from the first external interface 213 to the side of the piston 51 facing the first cover 21, pushing the piston 51 toward the second cover 61. The second external interface 613 is equivalent to an exhaust port. During the process of the cylinder moving from the second position to the first position, the second external interface 613 is equivalent to an air inlet. Gas enters from the second external interface 613 to the side of the piston 51 facing the second cover 61, pushing the piston 51 toward the first cover 21.

[0031] refer to Figure 2 Optionally, the first external interface 213 is disposed on the first cover 21, and the second external interface 613 is disposed on the second cover 61, which will not be elaborated here.

[0032] refer to Figure 3The projection of any point on the outer peripheral wall of the piston 51 onto the first surface is located on the first line 7. That is, the outer peripheral wall of the piston 51 is formed by the motion trajectory of the first line 7 along the axis of the first axis 3, which will not be elaborated here.

[0033] refer to Figure 3 The piston component 51 includes a first sliding portion 512, a first connecting portion 513, and a second sliding portion 514. The first sliding portion 512 is located on one side of the first connecting portion 513, and the second sliding portion 514 is located on the other side of the first connecting portion 513. The outer wall surface of the first sliding portion 512 (i.e., the wall surface away from the first connecting portion 513) is arc-shaped, and the outer wall surface of the second sliding portion 514 (i.e., the wall surface away from the second connecting portion) is arc-shaped. The outer wall surface of the first sliding portion 512 can be raised to be the same as the outer wall surface of the second sliding portion 514.

[0034] refer to Figure 3 The first connecting part 513 is in the shape of a cube or cuboid, the first sliding part 512 is in the shape of a semi-cylindrical part, and the second sliding part 514 is in the shape of a semi-cylindrical part. This facilitates rotational force and manufacturing, and makes it easier to arrange and install the first part 52 and the second part 57 (described below), thereby reducing the piston size.

[0035] refer to Figure 3 The first sliding part 512 has a radius of R1. The cylinder body 1 includes a first mating part 11, which is located on the side of the first sliding part 512 away from the first connecting part 513. The cross-section of the first mating part 11 is semi-circular, and the radius of the inner wall of the first mating part 11 is R2. R2-R1. The cylinder body 1 includes a first intermediate part 12, a second intermediate part 13, and a second mating part 14. The first intermediate part 12 is located between one end of the first mating part 11 and one end of the second mating part 14, and the second intermediate part 13 is located between the other end of the first mating part 11 and the other end of the second mating part 14. The first intermediate part 12 is flat, and the second intermediate part 13 is flat. The first intermediate part 12 and the second intermediate part 13 are parallel. The cross-section of the second mating part 14 is semi-circular, and the radius of the second sliding part 514 is R3. The inner diameter of the second mating part 14 is R4. R4-R2, R1=R3, R2=R4.

[0036] refer to Figure 2 and Figure 4 The piston assembly includes a first seal 53, the cross-section of which is approximately Z-shaped. During the operation of the cylinder, gas enters the first seal, causing the first seal 53 to expand and improve the sealing performance. The piston assembly 51 has a first mounting groove 515, the first seal 53 is located in the first mounting groove 515, the first seal 53 abuts against the bottom wall of the first mounting groove 515, and the first seal 53 abuts against the inner peripheral wall of the cylinder body 1.

[0037] refer to Figure 2 and Figure 5 The piston assembly includes a second component 57, which is connected to the piston component 51, for example, via a second retaining ring. The second component 57 includes a first main body 571, a first protrusion 572, and a second protrusion 573. The first main body 571 is a hollow cylinder. The first protrusion 572 protrudes from the outer peripheral wall of the first main body 571, and the second protrusion 573 protrudes from the inner peripheral wall of the first main body 571. The piston component 51 is fitted onto the first protrusion 572. The piston assembly includes a second seal 58, which is located between the piston component 51 and the first protrusion 572 to improve sealing performance. The piston assembly also includes a third seal 59, which is located between the second protrusion 573 and the piston component 51. The third seal 59 is fitted onto the first shaft 3, and the inner wall of the third seal 59 is adapted to the spiral slide 31 to improve sealing performance.

[0038] The first shaft 3 includes a first spiral portion 32 and a first support portion 33. The first support portion 33 extends from one end of the first spiral portion 32. The first cover 21 has a first receiving cavity. The first support portion 33 is located in the first receiving cavity. The cylinder includes a third member 9, which is sleeved on the first support portion 33. The cylinder also includes a fourth seal 10, which is sleeved on the third member 9. When the piston member 51 is in the first position, the first main body portion 571 is sleeved on the third member 9. The fourth seal 10 is located between the third member 9 and the first main body portion 571, thereby improving the sealing performance.

[0039] refer to Figure 2 and Figure 6 The piston assembly includes a fourth component 60, and a piston component 51 is fitted onto the fourth component 60. The piston component 51 and the fourth component 60 are interference-fitted. The cylinder includes a fifth seal 20, which is fitted onto the fourth component 60 and located between the fourth component 60 and the piston component 51 to improve sealing performance.

[0040] The first shaft 3 includes a second support portion 34, which extends from the other end of the first spiral portion 32. The cylinder includes a sixth seal 30, which is sleeved on the second support portion 34. When the piston 51 is in the second position, the fourth piece 60 is sleeved on the second support portion 34, and the sixth seal 30 is located between the fourth piece 60 and the second support portion 34.

[0041] Referring to reference 9, when the piston 51 is in the second position, the two first parts 52 cooperate with the second support part 34 to make the first shaft 3 and the piston 51 move together, which will not be elaborated here.

[0042] Although the technical solutions of this utility model have been shown and described above, it is understood that the above technical solutions are exemplary and should not be construed as limiting the present utility model. Any changes, modifications, substitutions and variations of the above technical solutions are within the protection scope of this utility model.

Claims

1. A cylinder, characterized in that, The cylinder includes a cylinder body (1), a first shaft (3), and a piston assembly. The piston assembly includes a piston element (51) and a first element (52). The outer peripheral wall of the piston element (51) is adapted to the inner peripheral wall of the cylinder body (1). The piston element (51) has a first mounting cavity (511). The first element (52) is rotatably disposed in the first mounting cavity (511). The piston element (51) is sleeved on the first shaft (3). The first shaft (3) has a spiral slide (31). A portion of the first element (52) cooperates with the spiral slide (31). Defined, the surface perpendicular to the axis of the first shaft (3) is the first surface. The line intersecting the first surface with the outer peripheral wall of the piston element (51) is the first line (7). Defined, the first surface has a first point. The first point is located on the axis of the first shaft (3). Defined, the first line (7) has a second point and a third point. The distance between the first point and the second point is L1. The distance between the first point and the third point is L2. L1≠L2.

2. The cylinder according to claim 1, characterized in that, Any point on the outer peripheral wall of the piston (51) is projected onto the first surface along the first line (7).

3. The cylinder according to claim 1 or 2, characterized in that, The piston component (51) includes a first sliding part (512), a first connecting part (513), and a second sliding part (514). The first sliding part (512) is located on one side of the first connecting part (513), and the second sliding part (514) is located on the other side of the first connecting part (513). The outer wall surface of the first sliding part (512) is arc-shaped, and the outer wall surface of the second sliding part (514) is arc-shaped.

4. The cylinder according to claim 3, characterized in that, The first connecting part (513) is in the shape of a cube or a cuboid, the first sliding part (512) is in the shape of a semi-cylindrical part, and the second sliding part (514) is in the shape of a semi-cylindrical part.

5. The cylinder according to claim 4, characterized in that, The radius of the first sliding part (512) is R1, and the cylinder body (1) includes a first mating part (11). The first mating part (11) is located on the side of the first sliding part (512) away from the first connecting part (513). The inner diameter of the first mating part (11) is R2, and 25mm≤R2-R1≤50mm.

6. The cylinder according to claim 4 or 5, characterized in that, The piston assembly includes a first seal (53) with a cross-section that is approximately Z-shaped. The piston assembly (51) has a first mounting groove (515). The first seal (53) is located in the first mounting groove (515). The first seal (53) abuts against the bottom wall of the first mounting groove (515) and abuts against the inner peripheral wall of the cylinder (1).

7. The cylinder according to claim 1, characterized in that, The cylinder includes a first end cap assembly, which includes a first cover (21) located at one end of the cylinder body (1). The first cover (21) includes a first mounting portion (211) and a first fixing portion (212). The first mounting portion (211) protrudes from the first fixing portion (212). One end of the cylinder body (1) is fitted onto the first mounting portion (211), and one end of the cylinder body (1) abuts against the first fixing portion (212). The cylinder also includes a second end cap assembly, which includes a second cover (61) located at one end of the cylinder body (1). At the other end of the cylinder (1), the first shaft (3) passes through the second cover (61), the second cover (61) includes a second mounting part (611) and a second fixing part (612), the second mounting part (611) protrudes from the second fixing part (612), the other end of the cylinder (1) is sleeved on the second mounting part (611), the other end of the cylinder (1) abuts against the second fixing part (612), the cylinder includes a first connecting rod (8), one end of the first connecting rod (8) is connected to the first fixing part (212), and the other end of the first connecting rod (8) is connected to the second fixing part (612).

8. The cylinder according to claim 1, characterized in that, The first component (52) is cylindrical. The piston assembly includes a first mounting sleeve (54), a first bearing (55), a first retaining ring (56), a second mounting sleeve, a second bearing, and a second retaining ring. The first bearing (55) is fitted onto one end of the first component (52), and the first mounting sleeve (54) is fitted onto the first bearing (55). The piston component (51) has a first groove. A portion of the first retaining ring (56) is located in the first groove. The first retaining ring (56) is located on the side of the first mounting sleeve (54) away from the second mounting sleeve. The second bearing is fitted onto the other end of the first component (52), and the second mounting sleeve is fitted onto the second bearing. The piston component (51) has a second groove. A portion of the second retaining ring is located in the second groove. The second retaining ring is located on the side of the second mounting sleeve away from the first mounting sleeve (54).

9. The cylinder according to claim 7, characterized in that, The first end cap assembly includes a first external interface (213) and a first flow port, the first external interface (213) being connected to the first flow port, the first flow port being located on one side of the piston (51), and the second end cap assembly includes a second external interface (613) and a second flow port, the second flow port being located on the other side of the piston (51).

10. The cylinder according to claim 7, characterized in that, The piston assembly includes a second component (57) connected to the piston component (51). The second component (57) includes a first main body (571), a first protrusion (572), and a second protrusion (573). The first main body (571) is hollow cylindrical. The first protrusion (572) protrudes from the outer peripheral wall of the first main body (571), and the second protrusion (573) protrudes from the inner peripheral wall of the first main body (571). The piston component (51) is sleeved on... The first protrusion (572) and the piston assembly include a second seal (58) located between the piston (51) and the first protrusion (572). The piston assembly includes a third seal (59) located between the second protrusion (573) and the piston (51). The third seal (59) is sleeved on the first shaft (3). The inner wall of the third seal (59) is adapted to the spiral slide (31). The first shaft (3) includes a first spiral portion (32) and a first support portion (33). The first support portion (33) extends from one end of the first spiral portion (32). The first cover (21) has a first receiving cavity. The first support portion (33) is located in the first receiving cavity. The cylinder includes a third piece (9). The third piece (9) is sleeved on the first support portion (33). The cylinder includes a fourth seal (10). The fourth seal (10) is sleeved on the third piece (9). When the piston (51) is in the first position, the first main body portion (571) is sleeved on the third piece (9). The fourth seal (10) is located between the third piece (9) and the first main body portion (571).

11. The cylinder according to claim 10, characterized in that, The piston assembly includes a fourth piece (60), and the piston piece (51) is sleeved on the fourth piece (60). The piston piece (51) and the fourth piece (60) are interference-fitted. The cylinder includes a fifth seal (20), which is sleeved on the fourth piece (60) and located between the fourth piece (60) and the piston piece (51). The first shaft (3) includes a second support portion (34) which extends from the other end of the first spiral portion (32). The cylinder includes a sixth seal (30) which is fitted onto the second support portion (34). When the piston (51) is in the second position, the fourth piece (60) is fitted onto the second support portion (34), and the sixth seal (30) is located between the fourth piece (60) and the second support portion (34).

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