A gear shift assembly

Abstract

The utility model relates to the field of pneumatics, and in particular to a shift assembly with high reliability. A first protrusion and a second protrusion face an inner wall corresponding to a first part, and respectively abut against the inner wall corresponding to the first part. Along a first direction, a first gas port and a liquid port are located on both sides of a first barrier shield body, and along the first direction, the second protrusion is close to the first gas port. The second protrusion can block gas from entering the other side from one side of a first piston head, thereby ensuring that the pressure required to push the first piston head during shifting is stable; the first protrusion is close to the liquid port, and the first protrusion is more likely to scrape off oil attached to the inner wall of a shell body, thereby reducing the oil from entering the other side from one side of the first piston head, thereby avoiding the oil from blocking the gas port on the other side of the first piston head; and the reliability of the shift assembly is achieved.

Description

Technical Field

[0001] The utility model relates to the field of pneumatics, in particular to a gear shifting component. Background Art

[0002] In the field of pneumatics, parts movement is often performed by gas drive. For example, gas is introduced into one side of a piston, and the gas pressure on one side of the piston increases, pushing the piston to move.

[0003] For example, the shift assembly acting on the transmission will achieve shifting through the operation of the piston. During operation, one side of the piston will be ventilated, and the other side of the piston will be connected to the oil chamber of the transmission. The movement of the piston is achieved by pressurizing the gas. Since the oil pressure in the oil chamber of the transmission is lower than that of the gas and it is relatively viscous, it is easy to adhere to the inner wall of the shell. In the process of gas pressurization to move the piston, the gas and oil are easy to pass through the gap between the piston and the inner wall and enter the other side from one side of the piston. If the oil accumulates at the gas inlet or outlet, it will cause blockage and affect the shifting. Summary of the invention

[0004] The utility model provides a shift assembly to solve the above problems:

[0005] A shift assembly includes a housing portion and a piston assembly, the piston assembly includes a first piston head, and it is defined that the linear movement direction of the first piston head is a first direction; the housing portion includes a housing, the housing includes a first part, the piston assembly includes a shield portion, the shield portion includes a first shield body, the first shield body is limited to the first piston head, along the radial direction of the first piston head, the first shield body has a first side wall and a second side wall, the first side wall and the first piston head are abutted, the second side wall includes a first protrusion and a second protrusion, the first protrusion and the second protrusion face the inner wall corresponding to the first part, the first protrusion and the second protrusion respectively abut the inner wall corresponding to the first part, the housing portion includes a first gas port and a liquid port, along the first direction, the first gas port and the liquid port are located on both sides of the first shield body, along the first direction, the second protrusion is close to the first gas port, and the first protrusion is close to the liquid port.

[0006] In the utility model, the first protrusion and the second protrusion are directed toward the inner wall corresponding to the first part, and the first protrusion and the second protrusion are respectively abutted against the inner wall corresponding to the first part. Along the first direction, the first gas port and the liquid port are located on both sides of the first barrier shield, and along the first direction, the second protrusion is close to the first gas port. Under the action of high-pressure gas, the wall of the second protrusion close to the gas side is more likely to be recessed in the direction of the gas force, so that the second protrusion abuts against the inner wall corresponding to the first part more tightly, and the second protrusion can block the gas from entering the other side from one side of the first piston head, thereby ensuring the stability of the pressure required to push the first piston head during gear shifting; the first protrusion is close to the liquid port, and compared with the abutment of the first side wall with the first part, the first protrusion abuts against the inner wall corresponding to the first part, and the contact area is smaller. The first protrusion is more likely to scrape off the oil body attached to the inner wall of the shell, reduce the oil body from one side of the first piston head to the other side, and avoid the oil body blocking the first gas port on the other side of the first piston head; the reliability of the gear shift assembly is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A cross-sectional schematic diagram of an embodiment of a shift assembly;

[0008] Figure 2 It is an enlarged schematic diagram of region A of an embodiment of a shift assembly;

[0009] Figure 3 is a schematic diagram of a second barrier shield under an embodiment;

[0010] Figure 4 It is a schematic diagram of a second barrier shield under another embodiment;

[0011] Figure 5 It is a schematic diagram of a second barrier shield under another embodiment;

[0012] Figure 6 An enlarged schematic diagram of region B of an embodiment of a shift assembly;

[0013] Figure 7 is a schematic diagram of a fifth barrier shield under an embodiment;

[0014] Figure 8 is a schematic diagram of a fifth barrier shield under another embodiment;

[0015] Fig. 9 is a schematic diagram of a fifth barrier shield under another embodiment;

[0016] Fig.10 An enlarged schematic diagram of the C region of an embodiment of a shift assembly;

[0017] Fig.11 is a schematic diagram of a sixth barrier shield under an embodiment;

[0018] Fig.12 is a schematic diagram of a sixth barrier shield under another embodiment;

[0019] Fig.13 is a schematic diagram of a sixth barrier shield under another embodiment;

[0020] Fig.14 Schematic comparison of the deformation of the protrusion before (solid line) and after (dashed line) the action of high-pressure gas.

[0021] Reference numerals:

[0022] Piston assembly 100, shift assembly 200

[0023] Shell portion 110, shell 111, first portion 1111, second portion 1112, first gas port 112, liquid port 113, second gas port 115, second step 116;

[0024] Piston rod 121, third end 1211, fourth end 1212, first step 1213;

[0025] A first piston head 122, a first groove 1221, a first groove bottom wall 1222, a first groove side wall 1223, a second groove side wall 1224, a second groove 1225, a second groove bottom wall 1226, a third groove side wall 1227, and a fourth groove side wall 1228;

[0026] The second piston head 123, the third groove 1231, the third groove bottom wall 1232, the fifth groove side wall 1233, the sixth groove side wall 1234, the fourth groove 1235, the fourth groove bottom wall 1236, the seventh groove side wall 1237, and the eighth groove side wall 1238;

[0027] Piston cylinder 124, first hole 1241, first section 1251, second section 1261, fifth groove 1242, fifth groove bottom wall 1243, ninth groove side wall 1244, tenth groove side wall 1245, sixth groove 1246, sixth groove bottom wall 1247, eleventh groove side wall 1248, twelfth groove side wall 1249;

[0028] A second limiting portion 130, a first limiting portion 140; a first plane 150;

[0029] The shield portion 160, the first shield body 161, the first side wall 1611, the second side wall 1612, the first protrusion 6121, the second protrusion 6122, the third protrusion 6123, the fourth protrusion 6124, the third side wall 1613, the first upper lip 1615, the first lower lip 1616, and the first notch 1617;

[0030] The second shield body 162 has a first end 1621, a second end 1622, a first gap 1623, a second notch 6231, and a third notch 6232;

[0031] The fourth baffle 163, the sixth side wall 1631, the seventh side wall 1632, the seventh protrusion 6321, the eighth protrusion 6322, the eighth side wall 1633, the eleventh protrusion 6323, the twelfth protrusion 6324, the second upper lip 1635, the second lower lip 1636, and the fourth notch 1637;

[0032] The fifth shield body 164, the fifth end 1641, the sixth end 1642, the second gap 1643, the fifth notch 6431, and the sixth notch 6432;

[0033] The third baffle body 165, the fourth side wall 1651, the fifth side wall 1652, the fifth protrusion 6521, the sixth protrusion 6522, the ninth protrusion 6523, the tenth protrusion 6524, the ninth side wall 1653, the third upper lip 1655, the third lower lip 1656, and the seventh notch 1657;

[0034] The sixth shield body 166 , the seventh end 1661 , the eighth end 1662 , the third gap 1663 , the eighth notch 6631 , and the ninth notch 6632 . DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0036] The technical solution of the specific implementation is described below in conjunction with the accompanying drawings:

[0037] In one embodiment, reference Figure 1-Figure 13A shift assembly 200 includes a housing 110 and a piston assembly 100. The piston assembly 100 includes a first piston head 122, a second piston head 123, a piston rod 121, and a piston cylinder 124. It is defined that the linear movement direction of the first piston head 122 is a first direction; the piston rod 121 includes a third end 1211 and a fourth end 1212, the first piston head 122 and the third end 1211 are limitedly connected or fixed, the second piston head 123 and the fourth end 1212 are limitedly connected or fixed, the piston cylinder 124 includes a first hole 1241, the first hole 1241 includes a first section 1251 and a second section 1261, and the first hole 1241 includes a first section 1251 and a second section 1261. A section 1251 and the piston rod 121 are slidably matched, and the second piston head 123 can move linearly along the extension direction of the wall portion corresponding to the second section 1261. The housing portion 110 includes a housing 111, and the housing 111 includes a first portion 1111 and a second portion 1112. The first piston head 122 can move linearly along the extension direction of the inner wall corresponding to the first portion 1111, and the second piston head 123 can move linearly along the extension direction of the inner wall corresponding to the second portion 1112; the housing portion includes a first gas port 112, a second gas port 115 and a liquid port 113. It is defined that the negative direction of the first direction is when the first piston head 122 moves along the first direction The first piston head 122 is located in the negative direction of the first direction of the first gas port 112, and the second piston head 123 is located in the negative direction of the first direction of the first piston head 122; the second gas port 115 is located in the negative direction of the first direction of the second piston head and / or the piston cylinder 124; the shift assembly includes a first limiting portion 140, the first limiting portion 140 is at least a part of the housing 111, the first limiting portion 140 is located in the negative direction of the first direction of the piston cylinder 124 and / or the second piston head 123, the housing 111 has a second step 116, along the first direction, at least a part of the piston cylinder 124 The first and second step 116 are respectively located between the first limit portion 140 and the second step 116, and the shift assembly includes a second limit portion 130, which is at least a part of the piston cylinder 124. Along the first direction, the second piston head 123 is located between the first limit portion 140 and the second limit portion 130; the piston assembly includes a piston rod 121, and along the first direction, the first piston head and the second piston head are respectively limited or fixed to the two ends of the piston rod, and the piston rod includes a first step 1213. At least a part of the piston cylinder 124 is located in the negative direction of the first direction of the first step 1213, and at least a part of the piston cylinder 124 can abut against the first step 1213.If so, the pressure of the gas passed through the first gas port 112 is greater than the pressure of the gas passed through the second gas port 115. Specifically, the first gas port 112 is ventilated and the second gas port 115 is not ventilated. The gas pressure on one side of the first piston head 122 increases, and the gas pushes the first piston head 122, the piston rod 121 and the second piston head 123 to move in the negative direction of the first direction. The first step 1213 piston cylinder and the piston cylinder 124 abut against each other, so the piston rod 121 pushes the piston cylinder 124 to move in the negative direction of the first direction until the piston cylinder 124 and / or the second piston head 123 abut against the first limiting portion 140, and the shift assembly is in the first gear position; the pressure of the gas passed through the first gas port 112 is less than the pressure of the gas passed through the second gas port 115. Specifically, the first gas port 112 is not ventilated, the second gas port 115 is ventilated, and the piston cylinder 124 and / or the second piston head 1 The gas pressure on one side of the first piston 123 increases, and the gas pushes the piston cylinder 124 and the second piston head 123 to move in the positive direction of the first direction until the piston cylinder 124 abuts against the second step 116, and the piston cylinder 124 stops moving, and the second piston head 123 continues to move until the second piston head 123 abuts against the second limiter 130, and the second piston head 123, the piston rod 121 and the first piston head 122 stop moving, and the shift assembly is in the second gear position; the pressure of the gas passed through the first gas port 112 is equal to the pressure of the gas passed through the second gas port 115, and the first piston head 122 is subjected to the force of the gas in the negative direction of the first direction, and the second piston head 123 and / or the piston cylinder 124 receive the force of the gas in the positive direction of the first direction, and the piston cylinder 124 abuts against the second step 116, and the piston cylinder 124 abuts against the first step 1213, and the shift assembly is in the third gear position. In this way, the shift assembly is switched between three gears.

[0038] refer to Figure 1-Figure 5A shift assembly includes a housing portion 110 and a piston assembly 100, wherein the piston assembly 100 includes a first piston head 122, and a linear movement direction of the first piston head 122 is defined as a first direction. The housing portion 110 includes a housing 111, and the housing 111 includes a first portion 1111. The piston assembly 100 includes a shield portion 160, and the shield portion includes a first shield body 161. The first shield body 161 is limited to the first piston head 122. Along the radial direction of the first piston head 122, the first shield body 161 has a first side wall 1611 and a second side wall 1612. The first side wall 1611 and the first side wall 1612 are A piston head 122 is abutted, and the second side wall 1612 includes a first protrusion 6121 and a second protrusion 6122. The first protrusion 6121 and the second protrusion 6122 face the inner wall corresponding to the first part 1111, and the first protrusion 6121 and the second protrusion 6122 respectively abut the inner wall corresponding to the first part 1111. The shell body includes a first gas port 112 and a liquid port 113. Along the first direction, the first gas port 112 and the liquid port 113 are located on both sides of the first baffle body 161; along the first direction, the second protrusion 6122 is close to the first gas port 112, and the first protrusion 6121 is close to the liquid port 113.

[0039] In the shift assembly, the protrusion abuts against the inner wall of the first part. Compared with the abutment of the entire first side wall and the first part, the protrusion abuts against the inner wall corresponding to the first part, and the contact area is smaller. The protrusion is more likely to scrape off the oil attached to the inner wall of the housing, reducing the oil from one side of the first piston head to the other side, and avoiding the oil from clogging the first air port on the other side of the first piston head; however, reference Fig.14 Under the action of high-pressure gas, the protrusion is more likely to deform, that is, along the first direction, the wall of the protrusion close to the gas side is more likely to be concave in the direction of the gas force, thereby causing the top of the wall of the protrusion close to the oil side to be more likely to deform toward the gas side, causing the oil body to more easily break through the obstruction of the protrusion and enter the other side from one side of the first piston head. Therefore, one protrusion cannot achieve the effect of blocking the oil body and gas on both sides at the same time.

[0040] In the utility model, the first protrusion and the second protrusion are directed toward the inner wall corresponding to the first part, and the first protrusion and the second protrusion are respectively abutted against the inner wall corresponding to the first part. Along the first direction, the first gas port and the liquid port are located on both sides of the first barrier shield, and along the first direction, the second protrusion is close to the first gas port. Under the action of high-pressure gas, the wall of the second protrusion close to the gas side is more likely to be concave toward the direction of the gas force, so that the second protrusion is more tightly abutted against the inner wall corresponding to the first part. The second protrusion can block the gas from entering the other side from one side of the first piston head, ensuring that the first piston head is in a stable state when shifting. The pressure required to push the first piston head is stable; the first protrusion is close to the liquid port, and compared with the first side wall abutting against the first part, the first protrusion abuts against the inner wall corresponding to the first part, and the contact area is smaller. The first protrusion is more likely to scrape off the oil attached to the inner wall of the shell, reducing the oil from one side of the first piston head to the other side, and avoiding the oil from clogging the first gas port on the other side of the first piston head; in addition, the second protrusion is deformed under the action of high-pressure gas, but has little effect on the first protrusion, so that the first protrusion can better scrape off the oil attached to the first part, thereby realizing the reliability of the shift assembly.

[0041] It should be noted that: the number of the first air ports can be one, that is, one side of the first piston head is ventilated and exhausted through the same first air port; of course, the number of the first air ports can also be multiple, that is, one side of the first piston head is ventilated and exhausted through different first air ports.

[0042] Specifically, the first protrusion 6121 and the second protrusion 6122 are wavy, the corresponding wave crests of the first protrusion 6121 and the second protrusion 6122 abut against the corresponding inner wall of the first portion 1111 , and there is a distance between the wave trough between the first protrusion 6121 and the second protrusion 6122 and the corresponding inner wall of the first portion 1111 .

[0043] Such a shift assembly, through the abutment between the wave crests corresponding to the first protrusion 6121 and the second protrusion 6122 and the inner wall corresponding to the first part 1111, there is a distance between the wave troughs between the first protrusion 6121 and the second protrusion 6122 and the inner wall corresponding to the first part 1111, compared with the contact with a larger area, the contact area between the wave crest and the inner wall corresponding to the first part 1111 is smaller, and in the process of the first piston head 122 moving along the first direction, it is beneficial to scrape off the oil body attached to the inner wall corresponding to the first part, and to prevent the oil body from entering the other side of the first piston head 122 from entering the other side, so as to avoid the oil body from blocking the first air port 112 after entering the other side of the first piston head 122, thereby ensuring the speed of intake and / or exhaust and ensuring the reliability of the shift mechanism. In addition, compared with the convex point, the wavy second protrusion has a larger wall area on both sides of the wave crest, and is subjected to a greater force from the high-pressure gas, making it easier for the second protrusion to deform, so that the second protrusion and the inner wall corresponding to the first part are more tightly abutted, and the gas blocking effect is better. Compared with the convex point, the wavy first protrusion has a larger wall area on both sides of the wave crest, which has a drainage effect on the oil body, draining the oil body to slide down from the wall on one side of the wave crest, so that the oil body leaves the abutment between the first protrusion and the inner wall corresponding to the first part.

[0044] Specifically, the second protrusion 6122 is wavy, and along the first direction, the slope of the wall on both sides of the wave crest close to the first gas port 112 is greater than the slope of the wall on both sides of the wave crest away from the first gas port 112; and / or, the first protrusion 6121 is wavy, and along the first direction, the slope of the wall on both sides of the wave crest close to the liquid port 113 is greater than the slope of the wall on both sides of the wave crest away from the liquid port 113; More specifically, the second protrusion 6122 is wavy, and along the first direction, the slope of the wall on both sides of the wave crest close to the first gas port 112 is greater than the slope of the wall on both sides of the wave crest away from the liquid port 113. α1 is greater than the slope β1 of the wall on both sides of the crest away from the first gas port 112; and the first protrusion 6121 is wavy, and along the first direction, the slope α2 of the wall on both sides of the crest close to the liquid port 113 is greater than the slope β2 of the wall on both sides of the crest away from the liquid port 113. In this way, when the height of the first shield body 161 is constant along the first direction, the distance between the crests of the first protrusion 6121 and the second protrusion 6122 is greater, so that the distance between the oil body and the gas in the first direction is farther, and it is easier to block the gas and liquid outside the two crests.

[0045] More specifically, the first piston head 122 includes a first groove 1221, which extends along the circumference of the first piston head 122, and the first shield body 161 is limited to the first groove 1221. The first piston head 122 includes a first groove bottom wall 1222 corresponding to the first groove 1221, and the first side wall 1611 includes a third protrusion and a fourth protrusion. The protruding directions of the third protrusion and the fourth protrusion are opposite to the protruding directions of the first protrusion 6121 and the second protrusion 6122, and the third protrusion and the fourth protrusion are in contact with the first groove bottom wall 1222.

[0046] Such a shift assembly, through the protrusion direction of the third protrusion and the fourth protrusion being opposite to the protrusion direction of the first protrusion 6121 and the second protrusion 6122, the third protrusion and the fourth protrusion abut against the first groove bottom wall 1222, so that the first side wall 1611 and the first groove bottom wall 1222 abut more tightly, preventing liquid and gas from entering the other side of the first piston head 122 respectively between the first side wall 1611 and the first groove bottom wall 122.

[0047] More specifically, the first piston head 122 includes a first groove side wall 1223 and a second groove side wall 1224 corresponding to the first groove 1221, the first groove side wall 1223 and the second groove side wall 1224 are arranged opposite to each other, the first shield body 161 includes a third side wall 1613, the third side wall 1613 and the first groove side wall 1223 are abutted, the first shield body 161 includes a first upper lip 1615 and a first lower lip 1616, the first upper lip 1615 is relative to the first lower lip 1616 along the first piston head 1 22 is radially closer to the inner wall corresponding to the first part 1111, the first upper lip 1615 includes a wall corresponding to the second protrusion 6122, the first lower lip 1616 includes a wall corresponding to the third protrusion or the fourth protrusion, and a first notch 1617 is provided between the first upper lip 1615 and the lower lip, the first notch 1617 is connected to the first air port 112, and along the first direction, the distance from the first upper lip 1615 to the second groove side wall 1224 is greater than the distance from the first lower lip 1616 to the second groove side wall 1224.

[0048] Such a shift assembly facilitates the gas entering the corresponding cavity of the housing 111 through the first gas port 112 to enter the cavity corresponding to the first groove 1221 by making the distance from the first upper lip 1615 to the second groove side wall 1224 greater than the distance from the first lower lip 1616 to the second groove side wall 1224 along the first direction, and facilitates the gas entering the cavity corresponding to the first groove 1221 to enter between the first upper lip 1615 and the first lower lip 1616 through the first notch 1617, so that the first upper lip 1615 and the first lower lip 1616 are deformed, the first upper lip 1615 includes a wall corresponding to the second protrusion 6122, and the first lower lip 1616 includes a wall corresponding to the third protrusion or the fourth protrusion. The second protrusion 6122 and the inner wall corresponding to the first part are more tightly abutted, and the wall corresponding to the third protrusion or the fourth protrusion is more tightly abutted against the first groove bottom wall 1222, so as to prevent gas from entering the other side of the first piston head 122 from one side, thereby ensuring the stability of the pressure required to push the first piston head 112 during gear shifting; under the action of gas pressure, the third side wall 1613 and the first groove side wall 1223 are more tightly abutted, so as to prevent oil from passing between the third side wall 1613 and the first groove side wall 1223 and entering the other side from one side of the first piston head 112, thereby preventing oil from entering the other side of the first piston head 122 and blocking the first gas port 112, thereby ensuring the speed of air intake and exhaust; in this way, the reliability of the gear shift assembly is achieved.

[0049] The shield portion 160 includes a second shield body 162, which is limited to the peripheral side of the first piston head 122. Along the first direction, the second shield body 162 is closer to the liquid port 113 than the first shield body 161. The hardness of the second shield body 162 is greater than that of the first shield body 161. At least part of the second shield body 162 abuts against the inner wall corresponding to the first part 1111, and the outer diameter of the second shield body 162 is greater than the outer diameter of the first piston head 122. In this way, the second shield body 162 can play a supporting role between the first piston head 122 and the inner wall corresponding to the first part 1111, and the second shield body 162 can reduce a part of the liquid and large particles of impurities from entering between the first shield body 161 and the second shield body 162, so as to avoid excessive liquid acting on the first shield body, which causes the first shield body 161 to fail.

[0050] More specifically, the second shield body 162 is limited to the circumference of the first piston head 122, the first piston head 122 has a second groove 1225, the first piston head 122 includes a second groove bottom wall 1226, a third groove side wall 1227 and a fourth groove side wall 1228 corresponding to the second groove 1225, the third groove side wall 1227 and the fourth groove side wall 1228 are arranged oppositely, the second shield body 162 is located between the third groove side wall 1227 and the fourth groove side wall 1228, along the radial direction of the first piston head 122, the inner wall corresponding to the second shield body 162 abuts against the second groove bottom wall 1226, and at least part of the outer wall corresponding to the second shield body 162 abuts against the inner wall corresponding to the first part 1111. .

[0051] More specifically, the hardness of the second shield body 162 is greater than that of the first shield body 161. Under the same pressure, the second shield body 162 has a smaller deformation. Therefore, if the second shield body 162 is designed to be a complete ring, it is difficult to install the second shield body 162 on the first piston head 122. To solve this problem, the second shield body 162 is in or approximately in a strip shape. When installing, the second shield body 162 can be wrapped around the circumference of the first piston head 122, that is, the second shield body 162 is placed in the second groove 1225, which is more convenient for installation. More specifically, refer to Figure 3-Figure 4 , the second shield body 162 extends along the circumference of the first piston head 122, the second shield body 162 includes a first end 1621 and a second end 1622, a first gap 1623 is provided between the first end 1621 and the second end 1622, and a plane perpendicular to the first direction is defined as the first plane 150; along the first direction, the first gap 1623 has a second notch 6231 and a third notch 6232, and the distance L of the projection of the extension path of the first gap 1623 from the third notch 6232 to the second notch 6231 on the first plane 150 is greater than zero. Compared with other embodiments, in the first direction, the liquid is more effectively blocked from moving from one side of the second shield body 162 to the other side. For example, referring to Figure 5 , the projection of the extension path of the gap between the two notches on the first plane 150 is equal to zero, and along the first direction, the liquid can more easily pass through the gap from one side of the barrier shield to the other side. In this embodiment, the wall corresponding to the first end 1621 and the second end 1622 will hinder the liquid. Of course, the first gap 1623 can have different shapes, refer to Figure 3-Figure 4 The first gap 1623 can be a "Z" type or a "slanted" type, which will not be elaborated here.

[0052] refer to Figure 1 , Fig.10 , Fig.11 , Fig.12 and Fig.13Specifically, the piston assembly includes a piston cylinder 124, the piston cylinder 124 is located in the negative direction of the first direction of the first piston head 122, the housing 111 includes a second portion 1112, the piston cylinder 124 can move linearly along the inner wall extension direction corresponding to the second portion 1112, the shield portion 160 includes a third shield body 165, the third shield body 165 is limited to the outer peripheral side of the piston cylinder 124, along the radial direction of the piston cylinder 124, the third shield body 165 has a fourth side wall 1651 and a fifth side wall 1652, the fourth side wall 1651 and the piston cylinder 124 at least partially abut The fifth side wall 1652 has a fifth protrusion 6521 and a sixth protrusion 6522 facing the wall corresponding to the second part 1112, and the fifth protrusion 6521 and the sixth protrusion 6522 are respectively abutted against the inner wall corresponding to the second part 1112, and the shell part 110 includes a second gas port 115, and the second gas port 115 is located in the negative direction of the first direction of the piston cylinder 124, and along the first direction, the second gas port 115 and the liquid port 113 are located on both sides of the third barrier body 165, and along the first direction, the sixth protrusion 6522 is close to the second gas port, and the fifth protrusion 6521 is close to the liquid port 113.

[0053] In the shift assembly, the protrusion abuts against the inner wall of the second part, and the contact area is smaller than that of the entire fifth side wall 1652 abutting against the inner wall corresponding to the second part. The protrusion is more likely to scrape off the oil attached to the inner wall of the housing, reducing the oil from one side of the piston cylinder 124 to the other side, and preventing the oil from clogging the second air port 115 on the other side of the piston cylinder 124; however, referring to Fig.14 Under the action of high-pressure gas, the protrusion is more likely to deform, that is, along the first direction, the wall of the protrusion close to the gas side is more likely to be concave in the direction of the gas force, thereby causing the top of the wall of the protrusion close to the oil side to be more likely to deform toward the gas side, causing the oil body to more easily break through the obstruction of the protrusion and enter the other side from one side of the piston cylinder 124. Therefore, one protrusion cannot achieve the effect of blocking the oil body and gas on both sides at the same time.

[0054] In the present invention, the fifth side wall 1652 has a fifth protrusion 6521 and a sixth protrusion 6522 facing the wall corresponding to the second part 1112, and the fifth protrusion 6521 and the sixth protrusion 6522 are respectively abutted against the inner wall corresponding to the second part 1112, and the second gas port 115 and the liquid port 113 are located on both sides of the third barrier shield 165. Along the first direction, the sixth protrusion 6522 is close to the second gas port. Under the action of high-pressure gas, the wall of the sixth protrusion 6522 close to the gas side is more likely to be concave toward the direction of the gas force, so that the sixth protrusion 6522 is more tightly abutted against the inner wall corresponding to the second part, and the sixth protrusion 6522 can prevent the gas from entering the other side from one side of the piston cylinder 124. , ensuring that the pressure required to push the piston cylinder 124 during gear shifting is stable; the fifth protrusion 6521 is close to the liquid port 113, and compared with the entire fifth side wall 1652 abutting against the inner wall corresponding to the second part, the fifth protrusion 6521 abuts against the inner wall corresponding to the second part, and the contact area is smaller. The fifth protrusion 6521 is more likely to scrape off the oil attached to the inner wall of the shell, reducing the oil from one side of the piston cylinder 124 to the other side, and avoiding the oil from clogging the second gas port on the other side of the piston cylinder. In addition, the sixth protrusion 6522 is deformed under the action of high-pressure gas, which has little effect on the fifth protrusion 6521, so that the fifth protrusion 6521 can better scrape off the oil attached to the first part, thereby achieving the reliability of the gear shift assembly.

[0055] It should be noted that: the number of the second air ports can be one, that is, one side of the piston cylinder is ventilated and exhausted through the same second air port; of course, the number of the second air ports can also be multiple, that is, one side of the piston cylinder is ventilated and exhausted through different second air ports.

[0056] Specifically, the sixth protrusion 6522 and the fifth protrusion 6521 are wavy, the wave crests corresponding to the sixth protrusion 6522 and the fifth protrusion 6521 abut against the inner wall corresponding to the second part, and there is a distance between the wave troughs corresponding to the sixth protrusion 6522 and the fifth protrusion 6521 and the inner wall corresponding to the second part.

[0057] In such a shifting assembly, the wave crests corresponding to the sixth protrusion 6522 and the fifth protrusion 6521 abut against the inner wall corresponding to the second part, and there is a distance between the wave troughs corresponding to the sixth protrusion 6522 and the fifth protrusion 6521 and the inner wall corresponding to the second part. Compared with the contact with a larger area, the contact area between the wave crests and the inner wall corresponding to the second part is smaller. In the process of the piston cylinder 124 moving along the first direction, it is beneficial to scrape off the oil body attached to the inner wall corresponding to the second part, and to prevent the oil body from entering from one side of the piston cylinder 124 to the other side, so as to avoid the oil body from entering the other side of the piston cylinder 124 and blocking the second air port, thereby ensuring the speed of intake and / or exhaust and the reliability of the shifting mechanism.

[0058] In addition, the wavy sixth protrusion 6522 has a larger wall area on both sides of the wave crest than the convex point, and is subjected to a greater force from the high-pressure gas, making it easier for the sixth protrusion 6522 to deform, so that the sixth protrusion 6522 and the inner wall corresponding to the second part abut more tightly, thereby better blocking the gas. The wavy fifth protrusion 6521 has a larger wall area on both sides of the wave crest than the convex point, which has a drainage effect on the oil body, draining the oil body down from the wall on one side of the wave crest, so that the oil body leaves the abutment between the fifth protrusion 6521 and the inner wall corresponding to the second part.

[0059] Specifically, the sixth protrusion 6522 is wavy, and along the first direction, the slope of the wall on the side close to the second gas port on both sides of the wave crest is greater than the slope of the wall on the side away from the second gas port on both sides of the wave crest; and / or, the fifth protrusion 6521 is wavy, and along the first direction, the slope of the wall on the side close to the liquid port 113 on both sides of the wave crest is greater than the slope of the wall on the side away from the liquid port 113 on both sides of the wave crest; More specifically, the sixth protrusion 6522 is wavy, and along the first direction, the slope of the wall on the side close to the second gas port on both sides of the wave crest is greater than the slope of the wall on the side away from the liquid port 113 on both sides of the wave crest. The slope α5 is greater than the slope β5 of the wall on both sides of the crest away from the second gas port; and the fifth protrusion 6521 is wavy, and along the first direction, the slope α6 of the wall on both sides of the crest close to the liquid port 113 is greater than the slope β6 of the wall on both sides of the crest away from the liquid port 113. In this way, when the height of the third barrier shield 165 is constant along the first direction, the distance between the crests of the fifth and sixth protrusions is greater, so that the distance between the oil body and the gas in the first direction is farther, and it is easier to block the gas and liquid outside the two crests.

[0060] More specifically, the piston cylinder 124 includes a fifth groove 1242, which extends along the circumference of the piston cylinder 124, and the third shield body 165 is limited to the fifth groove 1242. The piston cylinder 124 includes a fifth groove bottom wall 1243 corresponding to the fifth groove 1242, and the fourth side wall 1651 includes a ninth protrusion and a tenth protrusion, and the protruding directions of the ninth protrusion and the tenth protrusion are opposite to the protruding directions of the fifth protrusion and the sixth protrusion, and the ninth protrusion and the tenth protrusion are abutted against the fifth groove bottom wall 1243.

[0061] Such a shift assembly, through the protrusion direction of the ninth protrusion and the tenth protrusion being opposite to the protrusion direction of the fifth protrusion and the sixth protrusion, the ninth protrusion and the tenth protrusion abut against the fifth groove bottom wall 1243, so that the fourth side wall 1651 abuts against the fifth groove bottom wall 1243 more tightly, preventing liquid and gas from entering the other side of the piston cylinder 124 respectively between the fourth side wall 1651 and the fifth groove bottom wall 1243.

[0062] More specifically, the piston cylinder 124 includes a ninth groove side wall 1244 and a tenth groove side wall 1245 corresponding to the fifth groove, the ninth groove side wall 1244 and the tenth groove side wall 1245 are arranged opposite to each other, the third shield body 165 includes a ninth side wall 1653, the ninth side wall 1653 abuts against the ninth groove side wall 1244, and the third shield body 165 includes a third upper lip 1655 and a third lower lip 1656, and the third upper lip 1655 is more radially relative to the third lower lip 1656 along the piston cylinder 124. Close to the inner wall corresponding to the second part 1112, the third upper lip 1655 includes a wall corresponding to the sixth protrusion 6522, the third lower lip 1656 includes a wall corresponding to the ninth protrusion or the tenth protrusion, and a seventh notch 1657 is provided between the third upper lip 1655 and the third lower lip 1656. The seventh notch 1657 is connected to the second air port 115. Along the first direction, the distance from the third upper lip 1655 to the tenth groove side wall 1245 is greater than the distance from the third lower lip 1656 to the tenth groove side wall 1245.

[0063] Such a shift assembly, by making the distance from the third upper lip 1655 to the tenth groove side wall 1245 greater than the distance from the third lower lip 1656 to the tenth groove side wall 1245 along the first direction, facilitates the gas entering the corresponding cavity of the housing 111 through the second gas port 115 to enter the cavity corresponding to the fifth groove 1242, and facilitates the gas entering the cavity corresponding to the fifth groove 1242 to enter between the third upper lip 1655 and the third lower lip 1656 through the seventh notch 1657, so that the third upper lip 1655 and the third lower lip 1656 are deformed, the third upper lip 1655 includes the sixth protrusion 6522 corresponding to the wall, and the third lower lip 1656 includes the ninth protrusion or the tenth protrusion corresponding to the wall. The corresponding walls make the sixth protrusion 6522 and the inner wall corresponding to the second part abut more tightly, and the wall corresponding to the ninth protrusion or the tenth protrusion abuts more tightly with the fifth groove bottom wall 1243, preventing gas from entering the other side of the piston cylinder 124 from one side, thereby ensuring the stability of the pressure required to push the piston cylinder 124 during gear shifting; under the action of gas pressure, the ninth side wall 1653 and the ninth groove side wall 1244 abut more tightly, preventing oil from passing between the ninth side wall 1653 and the ninth groove side wall 1244 and entering the other side of the piston cylinder 124 from one side, thereby preventing oil from entering the other side of the piston cylinder 124 and blocking the second gas port 115, thereby ensuring the speed of air intake and exhaust; in this way, the reliability of the gear shift assembly is achieved.

[0064] The shield portion 160 includes a second shield body 162, and a sixth shield body 166 is limited to the peripheral side of the piston cylinder 124. Along the first direction, the sixth shield body 166 is closer to the liquid port 113 than the third shield body 165. The hardness of the sixth shield body 166 is greater than the hardness of the third shield body 165. At least part of the sixth shield body 166 abuts against the inner wall corresponding to the second part, and the outer diameter of the sixth shield body 166 is greater than the outer diameter of the piston cylinder 124. In this way, the sixth shield body 166 can play a supporting role between the inner wall corresponding to the piston cylinder and the second part, and the sixth shield body 166 can reduce a part of the liquid and large particles of impurities from entering between the third shield body 165 and the sixth shield body 166, so as to avoid excessive liquid acting on the third shield body 165, resulting in failure of the third shield body 165.

[0065] More specifically, the sixth barrier shield body 166 is limited to the circumferential side of the piston cylinder 124, the piston cylinder 124 has a sixth groove 1246, the piston cylinder 124 includes a sixth groove bottom wall 1246, an eleventh groove side wall 1248 and a twelfth groove side wall 1249 corresponding to the sixth groove 1246, the eleventh groove side wall 1248 and the twelfth groove side wall 1249 are arranged opposite to each other, the sixth barrier shield body 166 is located between the eleventh groove side wall 1248 and the twelfth groove side wall 1249, along the radial direction of the piston cylinder 124, the inner wall corresponding to the sixth barrier shield body 166 abuts against the sixth groove bottom wall 1246, and at least a portion of the outer wall corresponding to the sixth barrier shield body 166 abuts against the inner wall corresponding to the second part 1112.

[0066] More specifically, the hardness of the sixth barrier shield 166 is greater than that of the third barrier shield 165. Under the same pressure, the sixth barrier shield 166 has a smaller deformation. Therefore, if the sixth barrier shield 166 is designed to be a complete ring, it is difficult to install the sixth barrier shield 166 on the piston cylinder 124. To solve this problem, the sixth barrier shield 166 is in or approximately in a strip shape. When installing, the sixth barrier shield 166 can be wrapped around the circumference of the piston cylinder 124, that is, the sixth barrier shield 166 is placed in the sixth groove 1246, which is more convenient for installation. More specifically, refer to Figure 11-Figure 12 , the sixth barrier body 166 extends along the circumference of the piston cylinder 124, and the sixth barrier body 166 includes a seventh end 1661 and an eighth end 1662, and a third gap 1663 is provided between the seventh end 1661 and the eighth end 1662, and a plane perpendicular to the first direction is defined as the first plane 150; along the first direction, the third gap 1663 has an eighth notch 6631 and a ninth notch 6633, and the distance L of the projection of the extension path of the third gap 1663 from the ninth notch 6633 to the eighth notch 6631 on the first plane 150 is greater than zero. Compared with other embodiments, in the first direction, it is more effective to prevent the liquid from moving from one side of the sixth barrier body 166 to the other side. For example, referring to Fig.13, the projection of the extension path of the gap between the two notches on the first plane 150 is equal to zero, and along the first direction, the liquid is more likely to pass through the gap from one side of the shield body to the other side. In this embodiment, the wall corresponding to the seventh end 1661 and the eighth end 1662 will hinder the liquid. Of course, the third gap 1663 can have different shapes, refer to Figure 11-Figure 12 The third gap 1663 can be a "Z" type or a "slanted" type, which will not be elaborated here.

[0067] refer to Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 Specifically, the piston assembly includes a second piston head 123, the second piston head 123 is located in the negative direction of the first direction of the first piston head 122, the second piston head 123 can move to Xi'an along the extension direction of the inner wall corresponding to the piston cylinder 124, the shield portion 160 includes a fourth shield body 163, the fourth shield body 163 is limited to the outer peripheral side of the second piston head 123, along the radial direction of the second piston head 123, the fourth shield body 163 has a sixth side wall 1631 and a seventh side wall 1632, the sixth side wall 1631 and the second piston head 123 At least partially abutted, the seventh side wall 1632 has a seventh protrusion 6321 and an eighth protrusion 6322 facing the inner wall corresponding to the piston cylinder 124, the seventh protrusion 6321 and the eighth protrusion 6322 respectively abut against the inner wall corresponding to the piston head 124, the second gas port 115 is located in the negative direction of the first direction of the second piston head 123, and along the first direction, the second gas port 115 and the liquid port 113 are located on both sides of the fourth barrier shield 163, along the first direction, the eighth protrusion 6322 is close to the second gas port, and the seventh protrusion 6321 is close to the liquid port 113.

[0068] In the shift assembly, the protrusion abuts against the inner wall of the piston cylinder, and the contact area between the protrusion and the inner wall of the piston cylinder is smaller than that between the entire seventh side wall 1632 and the inner wall of the piston cylinder. The protrusion is more likely to scrape off the oil attached to the inner wall of the piston cylinder, thereby reducing the oil from entering the other side from one side of the second piston head 123, and preventing the oil from clogging the second gas port 115 on the other side of the second piston head 123; however, under the action of high-pressure gas, the protrusion is more likely to deform, that is, along the first direction, the wall of the protrusion close to the gas is more likely to be concave in the direction of the gas force, thereby causing the top of the wall of the protrusion close to the oil side to be more likely to deform toward the gas side, causing the oil to more easily break through the obstruction of the protrusion and enter the other side from one side of the piston cylinder 124. Therefore, one protrusion cannot achieve the effect of blocking the oil and gas on both sides at the same time.

[0069] In the present invention, the seventh side wall 1632 has a seventh protrusion 6321 and an eighth protrusion 6322 facing the inner wall corresponding to the piston cylinder 124, and the seventh protrusion 6321 and the eighth protrusion 6322 are respectively abutted against the inner wall corresponding to the piston cylinder 124, and the second gas port 115 and the liquid port 113 are located on both sides of the fourth barrier shield 163. Along the first direction, the eighth protrusion 6322 is close to the second gas port. Under the action of high-pressure gas, the wall of the eighth protrusion 6322 close to the gas side is more likely to be recessed in the direction of the gas force, so that the eighth protrusion 6322 is more tightly abutted against the inner wall of the piston cylinder, and the eighth protrusion 6322 can prevent the gas from entering the other side from one side of the second piston head. , ensuring that the pressure required to push the second piston head during gear shifting is stable; the seventh protrusion 6321 is close to the liquid port 113. Compared with the entire seventh side wall 1632 abutting against the inner wall of the piston cylinder, the seventh protrusion 6321 abuts against the inner wall of the piston cylinder, and the contact area is smaller. The seventh protrusion 6321 is more likely to scrape off the oil attached to the inner wall of the shell, reducing the oil from one side of the second piston head to the other side, avoiding the oil from clogging the second gas port on the other side of the second piston head. In addition, the eighth protrusion 6322 is deformed under the action of high-pressure gas, which has little effect on the seventh protrusion 6321, so that the seventh protrusion 6321 can better scrape off the oil attached to the inner wall of the piston head, thereby achieving the reliability of the gear shift assembly.

[0070] It should be noted that: the number of the second air ports can be one, that is, one side of the second piston head is ventilated and exhausted through the same second air port; of course, the number of the second air ports can also be multiple, that is, one side of the second piston head is ventilated and exhausted through different second air ports.

[0071] Specifically, the seventh protrusion 6321 and the eighth protrusion 6322 are wavy, the wave crests of the seventh protrusion 6321 and the eighth protrusion 6322 abut against the corresponding inner wall of the piston cylinder, and there is a distance between the wave trough between the seventh protrusion 6321 and the eighth protrusion 6322 and the inner wall of the piston cylinder.

[0072] Such a shift assembly is wavy through the seventh protrusion 6321 and the eighth protrusion 6322, the wave crests of the seventh protrusion 6321 and the eighth protrusion 6322 abut against the corresponding inner wall of the piston cylinder, and there is a distance between the wave trough between the seventh protrusion 6321 and the eighth protrusion 6322 and the inner wall of the piston cylinder. Compared with the contact with a larger area, the contact area between the wave crest and the inner wall of the piston cylinder is smaller, which is conducive to scraping off the oil attached to the inner wall of the piston cylinder during the movement of the second piston head along the first direction, and is conducive to preventing the oil from entering the other side of the second piston head from one side, so as to avoid the oil from entering the other side of the second piston head and blocking the second gas cylinder. Port 115 ensures the speed of air intake and / or exhaust and the reliability of the shifting mechanism; in addition, the wavy eighth protrusion 6322 has a larger wall area on both sides of the wave crest than the convex point, and is subjected to a greater force from the high-pressure gas, making it easier for the eighth protrusion 6322 to deform, so that the eighth protrusion 6322 and the inner wall of the piston cylinder are more tightly in contact with each other, thereby better blocking the gas; the wavy seventh protrusion 6321 has a larger wall area on both sides of the wave crest than the convex point, which has a drainage effect on the oil body, draining the oil body down from the wall on one side of the wave crest, so that the oil body leaves the contact between the seventh protrusion 6321 and the inner wall of the piston cylinder.

[0073] Specifically, the eighth protrusion 6322 is wavy, and along the first direction, the slope of the wall on the side close to the second gas port on both sides of the wave crest is greater than the slope of the wall on the side away from the second gas port on both sides of the wave crest; and / or, the seventh protrusion 6321 is wavy, and along the first direction, the slope of the wall on the side close to the liquid port 113 on both sides of the wave crest is greater than the slope of the wall on the side away from the liquid port 113 on both sides of the wave crest; More specifically, the eighth protrusion 6322 is wavy, and along the first direction, the slope of the wall on the side close to the second gas port on both sides of the wave crest is greater than α3 The slope β3 of the wall on the side away from the second gas port on both sides of the crest; and the seventh protrusion 6321 is wavy, and along the first direction, the slope α4 of the wall on the side close to the liquid port 113 on both sides of the crest is greater than the slope β4 of the wall on the side away from the liquid port 113 on both sides of the crest. In this way, when the height of the fourth barrier shield 163 is constant along the first direction, the distance between the crests of the seventh protrusion 6321 and the eighth protrusion 6322 is larger, so that the distance between the oil body and the gas in the first direction is farther, and it is easier to block the gas and liquid outside the two crests.

[0074] More specifically, the second piston head 123 includes a third groove 1231, which extends along the circumference of the second piston head 123, and the fourth shield body 163 is limited to the third groove 1231. The second piston head 123 includes a third groove bottom wall 1232 corresponding to the third groove 1231, and the sixth side wall 1631 includes an eleventh protrusion and a twelfth protrusion, and the protruding directions of the eleventh protrusion and the twelfth protrusion are opposite to the protruding directions of the seventh protrusion and the eighth protrusion, and the eleventh protrusion and the twelfth protrusion are abutted against the fifth groove bottom wall 1243.

[0075] Such a shift assembly, through the protrusion direction of the ninth protrusion and the tenth protrusion being opposite to the protrusion direction of the fifth protrusion and the sixth protrusion, the ninth protrusion and the tenth protrusion abut against the third groove bottom wall 1232, so that the sixth side wall 1631 abuts against the third groove bottom wall 1232 more tightly, preventing liquid and gas from entering the other side of the second piston head 123 respectively between the sixth side wall 1631 and the third groove bottom wall 1232.

[0076] More specifically, the second piston head 123 includes a fifth groove side wall 1233 and a sixth groove side wall 1234 corresponding to the third groove 1231, the fifth groove side wall 1233 and the sixth groove side wall 1234 are arranged opposite to each other, the fourth barrier shield 163 includes an eighth side wall 1633, the eighth side wall 1633 and the fifth groove side wall 1233 are abutted, and the fourth barrier shield 163 includes a second upper lip 1635 and a second lower lip 1636, and the second upper lip 1635 is relative to the second lower lip 1636 along the second piston head 123. Radially closer to the inner wall corresponding to the piston cylinder 124, the second upper lip 1635 includes a wall corresponding to the eighth protrusion 6322, the second lower lip 1636 includes a wall corresponding to the eleventh protrusion or the twelfth protrusion, and a fourth notch 1637 is provided between the second upper lip 1635 and the second lower lip 1636. The fourth notch 1637 and the second air port 115 are connected. Along the first direction, the distance from the second upper lip 1635 to the sixth groove side wall 1234 is greater than the distance from the second lower lip 1636 to the sixth groove side wall 1234.

[0077] Such a shift assembly, by making the distance from the second upper lip 1635 to the sixth groove side wall 1234 greater than the distance from the second lower lip 1636 to the sixth groove side wall 1234 along the first direction, facilitates the gas entering the corresponding cavity of the housing 111 through the second gas port 115 to enter the cavity corresponding to the third groove 1231, and facilitates the gas entering the cavity corresponding to the third groove 1231 to enter between the second upper lip 1635 and the second lower lip 1636 through the fourth notch 1637, so that the second upper lip 1635 and the second lower lip 1636 are deformed, the second upper lip 1635 includes a wall corresponding to the eighth protrusion 6322, and the second lower lip 1636 includes a wall corresponding to the eleventh protrusion or the twelfth protrusion , so that the eighth protrusion 6322 and the corresponding inner wall of the piston cylinder are more tightly abutted, and the wall corresponding to the eleventh protrusion or the twelfth protrusion is more tightly abutted against the third groove bottom wall 1232, so as to prevent gas from entering the other side from one side of the second piston head 123, thereby ensuring the stability of the pressure required to push the second piston head 123 during gear shifting; under the action of gas pressure, the eighth side wall 1633 and the fifth groove side wall 1233 are more tightly abutted, so as to prevent oil from passing between the eighth side wall 1633 and the fifth groove side wall 1233 and entering the other side from one side of the second piston head 123, thereby preventing oil from blocking the second gas port 115 behind the other side of the second piston head 123, thereby ensuring the speed of air intake and exhaust; in this way, the reliability of the gear shift assembly is achieved.

[0078] The shield portion 160 includes a fifth shield body 164, which is limited to the peripheral side of the second piston head 123. Along the first direction, the fifth shield body 164 is closer to the liquid port 113 than the fourth shield body 163. The hardness of the fifth shield body 164 is greater than the hardness of the fourth shield body 163. At least part of the fifth shield body 164 abuts against the inner wall corresponding to the piston cylinder 124, and the outer diameter of the fifth shield body 164 is greater than the outer diameter of the second piston head. In this way, the fifth shield body 164 can play a supporting role between the first piston head 122 and the inner wall corresponding to the first part 1111, and the fifth shield body 164 can reduce a part of the liquid and large particles of impurities from entering between the fourth shield body 163 and the fifth shield body 164, so as to avoid excessive liquid acting on the fourth shield body 163, which causes the fourth shield body 163 to fail.

[0079] More specifically, the fifth shield body 164 is limited to the circumferential side of the second piston head 123, the second piston head 123 has a fourth groove 1235, the second piston head 123 includes a fourth groove bottom wall 1236, a seventh groove side wall 1237 and an eighth groove side wall 1238 corresponding to the fourth groove 1235, the seventh groove side wall 1237 and the eighth groove side wall 1238 are relatively arranged, the fifth shield body 164 is located between the seventh groove side wall 1237 and the eighth groove side wall 1238, along the radial direction of the second piston head 123, the inner wall corresponding to the fifth shield body 164 is in contact with the fourth groove bottom wall 1236, and at least part of the outer wall corresponding to the fifth shield body 164 is in contact with the inner wall corresponding to the piston head 124.

[0080] More specifically, the hardness of the fifth barrier body 164 is greater than that of the fourth barrier body 163. Under the same pressure, the fifth barrier body 164 has a smaller deformation. Therefore, if the fifth barrier body 164 is designed to be a complete ring, it is difficult to install the fifth barrier body 164 on the piston cylinder 124. To solve this problem, the fifth barrier body 164 is in or approximately in a strip shape. When installing, the fifth barrier body 164 can be wrapped around the circumference of the second piston head 123, that is, the fifth barrier body 164 is placed in the fourth groove 1235, which is more convenient for installation. More specifically, refer to Figure 7-Figure 8 , the fifth shield body 164 extends along the circumference of the second piston head 123, the fifth shield body 164 includes a fifth end 1641 and a sixth end 1642, a second gap 1643 is provided between the fifth end 1641 and the sixth end 1642, and a plane perpendicular to the first direction is defined as the first plane 150; along the first direction, the second gap 1643 has a fifth notch 6431 and a sixth notch 6432, and the distance L of the projection of the extension path of the second gap 1643 from the fifth notch 6431 to the sixth notch 6432 on the first plane 150 is greater than zero. Compared with other embodiments, in the first direction, it is more effective to prevent the liquid from flowing from one side of the fifth shield body 164 to the other side. For example, referring to Fig. 9 , the projection of the extension path of the gap between the two notches on the first plane 150 is equal to zero, and along the first direction, the liquid is more likely to pass through the gap from one side of the barrier shield to the other side. In this embodiment, the wall corresponding to the fifth end 1641 and the sixth end 1642 will hinder the liquid. Of course, the second gap 1643 can have different shapes, refer to Figure 7-Figure 8 The second gap 1643 can be a "Z" type or a "slanted" type, which will not be elaborated here.

[0081] It should be noted that: although this specification has described the utility model in detail with reference to the above-mentioned implementation modes, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify, combine or replace the utility model with equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the utility model should be included in the scope of the claims of the utility model.

Claims

1. A shift assembly, comprising a housing portion (110) and a piston assembly, wherein the piston assembly (100) comprises a first piston head (122), characterized in that: The first piston head (122) is defined as having a first direction of linear movement; the housing portion (110) includes a housing (111), the housing (111) includes a first portion (1111), the piston assembly (100) includes a shield portion (160), the shield portion (160) includes a first shield body (161), the first shield body (161) is limited to the first piston head (122), and along the radial direction of the first piston head (122), the first shield body (161) has a first side wall (1611) and a second side wall (1612), the first side wall (1611) and the first piston head (122) are in contact, and the second side wall (1612) includes a first protrusion ( The first protrusion (6121) and the second protrusion (6122) are oriented toward an inner wall corresponding to the first part (1111), and the first protrusion (6121) and the second protrusion (6122) are respectively abutted against the inner wall corresponding to the first part (1111); the shell portion (110) comprises a first gas port (112) and a liquid port (113); along the first direction, the first gas port (112) and the liquid port (113) are located on both sides of the first baffle body (161); and along the first direction, the second protrusion (6122) is close to the first gas port (112), and the first protrusion (6121) is close to the liquid port (113).

2. The shift assembly according to claim 1, characterized in that: The first protrusion (6121) and the second protrusion (6122) are wavy, the corresponding wave crests of the first protrusion (6121) and the second protrusion (6122) abut against the inner wall corresponding to the first part (1111), and there is a distance between the wave trough between the first protrusion (6121) and the second protrusion (6122) and the inner wall corresponding to the first part (1111).

3. The shift assembly according to claim 1 or 2, characterized in that: It is defined that the negative direction of the first direction is the direction in which the first piston head (122) moves away from the first gas port (112) when moving along the first direction; the first protrusion (6121) is located in the negative direction of the second protrusion (6122) along the first direction, the second protrusion (6122) is wavy, and along the first direction, the slope of the wall on both sides of the crest close to the first gas port (112) is greater than the slope of the wall on both sides of the crest away from the first gas port (112); and / or the first protrusion (6121) is wavy, and along the first direction, the slope of the wall on both sides of the crest close to the liquid port (113) is greater than the slope of the wall on both sides of the crest away from the liquid port (113).

4. The shift assembly according to claim 1 or 2, characterized in that: The first piston head (122) comprises a first groove (1221), wherein the first groove (1221) extends along the circumference of the first piston head (122); the first shield body (161) is limited in the first groove (1221); the first piston head (122) comprises a first groove bottom wall (1222) corresponding to the first groove (1221); the first side wall (1611) comprises a third protrusion and a fourth protrusion; the protrusion directions of the third protrusion and the fourth protrusion are opposite to those of the first protrusion (6121) and the second protrusion (6122); and the third protrusion and the fourth protrusion abut against the first groove bottom wall (1222).

5. The shift assembly according to claim 4, characterized in that: The first piston head (122) comprises a first groove side wall (1223) and a second groove side wall (1224) corresponding to the first groove (1221), the first groove side wall (1223) and the second groove side wall (1224) being arranged opposite to each other, the first blocking shield body (161) comprises a third side wall (1613), the third side wall (1613) and the first groove side wall (1223) being in abutment with each other, the first blocking shield body (161) comprises a first upper lip (1615) and a first lower lip (1616), the first upper lip (1615) being arranged relative to the first lower lip (1616) along the first piston head (122). Radially closer to the inner wall corresponding to the first part (1111), the first upper lip (1615) includes a wall corresponding to the second protrusion (6122), the first lower lip (1616) includes a wall corresponding to the third protrusion or the fourth protrusion, and there is a first notch (1617) between the first upper lip (1615) and the lower lip, the first notch (1617) and the first air port (112) are connected, and along the first direction, the distance from the first upper lip (1615) to the second groove side wall (1224) is greater than the distance from the first lower lip (1616) to the second groove side wall (1224).

6. The shift assembly according to claim 1 or 2, characterized in that: The shield portion (160) includes a second shield body (162), which is limited to the peripheral side of the first piston head (122). Along the first direction, the second shield body (162) is closer to the liquid port (113) than the first shield body (161). The hardness of the second shield body (162) is greater than that of the first shield body (161). At least a portion of the second shield body (162) abuts against the inner wall corresponding to the first portion (1111), and the outer diameter of the second shield body (162) is greater than the outer diameter of the first piston head.

7. The shift assembly according to claim 6, characterized in that: The second shield body (162) is in or approximately in a strip shape, and the second shield body (162) extends along the circumference of the first piston head (122). The second shield body (162) includes a first end (1621) and a second end (1622), and a first gap (1623) is provided between the first end (1621) and the second end (1622). A plane perpendicular to the first direction is defined as the first plane (150); along the first direction, the first gap (1623) has a second notch (6231) and a third notch (6232), and the distance of the projection of the extension path of the first gap (1623) from the second notch (6231) to the third notch (6232) on the first plane (150) is greater than zero.

8. The shift assembly according to claim 1 or 2, characterized in that: The negative direction of the first direction is the direction in which the first piston head (122) moves away from the first gas port (112) when moving along the first direction; the piston assembly comprises a piston cylinder (124), the piston cylinder (124) is located in the negative direction of the first direction of the first piston head (122), the housing (111) comprises a second part (1112), the outer wall of the piston cylinder (124) and the inner wall corresponding to the second part (1112) cooperate, the shield portion (160) comprises a third shield body (165), the third shield body (165) is limited to the outer peripheral side of the piston cylinder (124), along the radial direction of the piston cylinder (124), the third shield body (165) has a fourth side wall (1651) and a fifth side wall (1652), the fourth side wall (1651) and the fifth side wall (1652) are connected to each other. The fifth side wall (1652) is abutted against at least part of the piston cylinder (124), the fifth protrusion (6521) and the sixth protrusion (6522) facing the wall corresponding to the second part (1112), the fifth protrusion (6521) and the sixth protrusion (6522) respectively abut against the inner wall corresponding to the second part (1112), the shell part (110) includes a second gas port (115), the second gas port (115) is located in the negative direction of the first direction of the piston cylinder (124), and along the first direction, the second gas port (115) and the liquid port (113) are located on both sides of the third baffle body (165), along the first direction, the sixth protrusion (6522) is close to the second gas port, and the fifth protrusion (6521) is close to the liquid port (113).

9. The shift assembly according to claim 8, characterized in that: The piston assembly comprises a second piston head (123), the second piston head (123) is located in the negative direction of the first direction of the first piston head (122), the second piston head (123) and the corresponding inner wall of the piston cylinder (124) cooperate, the shield portion (160) comprises a fourth shield body (163), the fourth shield body (163) is limited to the outer peripheral side of the second piston head (123), along the radial direction of the second piston head (123), the fourth shield body (163) has a sixth side wall (1631) and a seventh side wall (1632), the sixth side wall (1631) and at least part of the second piston head (123) The seventh side wall (1632) has a seventh protrusion (6321) and an eighth protrusion (6322) facing the inner wall corresponding to the piston cylinder (124), and the seventh protrusion (6321) and the eighth protrusion (6322) respectively abut against the inner wall corresponding to the piston cylinder (124). The second gas port (115) is located in the negative direction of the first direction of the second piston head (123). Along the first direction, the second gas port (115) and the liquid port (113) are located on both sides of the fourth baffle body (163), and the eighth protrusion (6322) is close to the second gas port, and the seventh protrusion (6321) is close to the liquid port (113).

10. The shift assembly according to claim 9, characterized in that: The shift assembly comprises a first limiting portion (140), the first limiting portion (140) being at least a portion of the housing (111), the first limiting portion (140) being located in a negative direction of a first direction of the piston cylinder (124) and the second piston head (123), the housing (111) having a second step (116), along the first direction, at least a portion of the piston cylinder (124) being located between the first limiting portion (140) and the second step (116), the shift assembly comprises a second limiting portion (130), the second limiting portion (130) being the piston cylinder (124) At least a portion of the piston cylinder (124) is located in the negative direction of the first direction of the first step (1213), and at least a portion of the piston cylinder (124) is capable of abutting against the first step (1213).

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