A sealed piston device and method of use

Abstract

The present application relates to the technical field of piston sealing, and particularly relates to a sealed piston device and a use method. The device comprises a shell assembly member forming a piston chamber, an outer piston and a first sealing member; the outer piston is arranged in the piston chamber and can reciprocate, the piston chamber is connected with an oil pressure channel, and a pressure oil cavity is arranged on one side of the outer piston facing the oil pressure channel; the first sealing member comprises a base and a sealing lip arranged on the base, the base is fixedly connected to a corner of the outer piston close to the pressure oil cavity, and is smoothly extended to the surface of the outer piston from two surfaces of the outer piston; the sealing lip abuts against the inner wall of the piston chamber to seal the pressure oil cavity and slides on the inner wall of the shell assembly member when the outer piston reciprocates. The device is smoothly extended to the surface of the outer piston from both sides of the base arranged at the corner of the outer piston, and does not have a redundant rubber layer; the method uses the sealed piston device of the present application, and can avoid the problem of too small gap between the outer piston and the shell assembly member.

Description

Technical Field

[0001] This invention relates to the field of clutch piston sealing technology, specifically to a piston sealing device and its usage method. Background Technology

[0002] When a hybrid vehicle enters parallel mode, the wet clutch needs to engage quickly to transmit engine torque to the wheels. The torque responsiveness of the wet clutch is closely related to the vehicle's power performance. The engagement process of the wet clutch involves injecting pressurized oil into the clutch piston chamber, which then pushes the pressure piston to move. The piston's movement presses against the friction plates and steel plates, transmitting torque. The speed at which the piston is pushed affects the wet clutch's responsiveness.

[0003] Patent publication number "CN105247234A" discloses an integrated piston seal, which improves the shifting response of a hydraulic clutch by reducing the difference in friction in the sliding direction caused by the directionality of the sealing lip (62). Figure 1 As shown, the piston integral seal has a sealing lip (62) integrally disposed on the clutch piston of the hydraulic clutch and facing the hydraulic chamber side (S1). The sealing lip (62) forms a main sealing edge portion (62a) on the hydraulic chamber (S1) side and a secondary sealing edge portion (62b) on the reverse hydraulic chamber (S2) side in the sliding portion with the mating sliding surface. Regarding these main sealing edge portions (62a) and secondary sealing edge portions (62b), in the uninstalled state, the angle (α1, α2) of the inclined surface on the hydraulic chamber (S1) side is smaller than the angle (β1, β2) of the inclined surface on the reverse hydraulic chamber (S2) side. In the installed state, the angle (α1', α2') of the inclined surface on the hydraulic chamber (S1) side relative to the mating sliding surface and the angle (β1', β2') of the inclined surface on the reverse hydraulic chamber (S2) side relative to the mating sliding surface are approximately equal.

[0004] The piston skeleton in the aforementioned patent is covered with a rubber layer on the side near the outer casing. Initially, there is a gap between the rubber sealing layer and the inner wall of the outer casing to facilitate relative movement between them. However, the rubber expands after being soaked in high-temperature oil, reducing the gap between the rubber sealing layer and the inner wall of the outer casing. This makes it difficult for transmission oil to pass through this gap to lubricate the piston lip. In severe cases, the gap between the rubber and the inner wall of the outer casing may be completely eliminated, preventing the oil from lubricating the piston lip. This increases the contact area between the rubber layer and the inner wall of the outer casing, increasing sliding friction and resulting in poor responsiveness. Summary of the Invention

[0005] The main objective of this invention is to solve the problem that the gap between the piston and the inner wall of the outer casing is too small after the rubber layer is heated, caused by the rubber layer wrapping the piston to the outside. This invention provides a sealing piston device and a method of use.

[0006] The technical solution adopted in this invention is: a sealing piston device, comprising a shell assembly forming a piston chamber.

[0007] An outer piston is placed in a piston chamber and can reciprocate. The piston chamber is connected to a hydraulic channel, and the side of the piston chamber facing the hydraulic channel is a pressure oil chamber.

[0008] The first seal includes a base and a sealing lip disposed on the base. The base is fixed to the corner of the outer piston near the pressure oil chamber and extends smoothly to both sides of the outer piston towards the surface of the outer piston. The sealing lip abuts against the inner wall of the piston chamber to seal the pressure oil chamber and slides on the inner wall of the shell assembly when the outer piston reciprocates.

[0009] Furthermore, the housing assembly includes a clutch shaft and an outer housing sleeved outside the clutch shaft, with the piston chamber formed between the outer housing and the clutch shaft.

[0010] Furthermore, the sealing lip abuts against the inner wall of the housing assembly and is inclined toward the pressure oil cavity; the sealing lip includes a sealing section protruding toward the outer side of the housing assembly; the sealing section includes a sealing protrusion that slides against the inner wall of the housing assembly; a depression is formed at the connection between the sealing lip and the base on the side near the pressure oil cavity, and the high point of the sealing protrusion of the sealing gasket is located on the side of the low point of the depression toward the pressure oil cavity.

[0011] Furthermore, the sealing lip also includes a tension section, which extends from the sealing section and is located on the side of the sealing section near the pressure oil chamber, providing tension for the sealing section to seal the pressure oil chamber; the root of the tension section connects to the base to form the recess.

[0012] Furthermore, an auxiliary support is formed at the connection between the sealing section and the tension section to assist in supporting the pressure of the sealing protrusion of the sealing section on the inner wall of the shell assembly; the auxiliary support is located on the side of the sealing protrusion near the pressure oil chamber.

[0013] Furthermore, the auxiliary support portion is located on the side of the sealing protrusion near the pressure oil cavity; the auxiliary support portion includes a thickened protrusion formed between the pressure oil cavity side and the recessed side.

[0014] Furthermore, the base includes a first base segment and a second base segment fixed to the two sides of the outer piston. The first base segment connects to the sealing segment and extends smoothly from the sealing segment to the surface of the outer piston. The second base segment forms the depression at the connection with the tension segment and extends from the low point of the depression to the other side adjacent to the surface of the outer piston.

[0015] Furthermore, it also includes an inner piston and a reset elastic element. The inner piston is placed in the piston chamber, with one end fixed to the shell assembly and the other end slidably abutting against the outer piston through a third seal, forming a balance oil chamber with the outer piston and the shell assembly. The shell assembly is provided with a balance oil passage communicating with the balance oil chamber. The reset elastic element is placed in the balance oil chamber to push the outer piston to move and reset in the direction of reducing the pressure oil chamber.

[0016] Furthermore, the outer piston has multiple protrusions spaced circumferentially on the side facing the pressure oil chamber. When the multiple protrusions abut against the inner wall of the shell assembly, a second gap is left between the side of the outer piston near the pressure oil chamber and the inner wall of the shell assembly.

[0017] Furthermore, the clutch assembly is located in the piston chamber in the direction of movement of the outer piston end; the clutch assembly includes multiple drive plates and multiple driven plates; the drive plates and driven plates are arranged alternately in the direction of movement of the outer piston, and the drive plates abut against and drive the driven plates to rotate under the thrust of the outer piston end.

[0018] Furthermore, the outer piston seal is located at the corner of the outer piston and does not cover the outer surface of the outer piston away from the corner; the outer piston seal located at the outer corner of the outer piston is a first seal that slides against the outer side of the shell assembly; the outer piston seal located at the inner corner of the outer piston is a second seal that slides against the inner side wall of the piston chamber.

[0019] Furthermore, the included angle β formed by the first base segment and the sealing segment is 150 to 180°; the included angle α formed by the sealing protrusion of the sealing segment is in the range of 110 to 140°; and the included angle θ of the tension segment in the vertical direction is 120 to 150°.

[0020] In another aspect, the present invention provides a method of using a sealing piston device, wherein the method includes,

[0021] The base with a sealing lip is fixed to the corner of the outer piston, so that the two surfaces of the base extend smoothly towards the corner of the outer piston and tend to stop at the outer surface of the outer piston.

[0022] The outer piston, which is equipped with an external piston seal, is placed in the piston chamber of the housing assembly, so that the sealing section of the sealing lip slides against the inner wall of the housing assembly to form a seal on the pressure oil chamber.

[0023] Injecting or extracting oil into the pressure oil chamber regulates the oil pressure within the chamber, causing the outer piston to reciprocate in a direction away from the pressure oil chamber.

[0024] According to the present invention, a method for using a sealing piston device is provided, wherein injecting or withdrawing oil into a pressure oil chamber to regulate the oil pressure within the pressure oil chamber, causing the outer piston to reciprocate in a direction away from the pressure oil chamber, includes,

[0025] Oil is injected into the pressure chamber through the oil pressure channel to increase the oil pressure in the pressure chamber, which pushes the outer piston to move away from the pressure chamber.

[0026] The oil discharged from the pressure oil chamber through the oil pressure channel reduces the oil pressure in the pressure oil chamber, making the oil pressure on the opposite side of the outer piston chamber from the pressure oil chamber greater than the oil pressure in the pressure oil chamber, causing the outer piston to move to the side of the pressure oil chamber to reset.

[0027] The beneficial effects of the present invention include: 1. The base of the first sealing member is fixed at the corner of the outer piston near the pressure oil chamber, which can avoid excessive coverage of the outer piston surface and help reduce the first gap with the shell assembly. It extends smoothly to both sides of the outer piston and tends to the outer piston surface, so that there is no redundant rubber layer on the outer piston surface. When the oil temperature rises, the sealing lip only expands at the corner and abuts against the inner wall of the shell assembly to seal the pressure oil chamber. Since there is no redundant rubber layer on the outer surface of the outer piston, the gap between the outer piston surface and the shell assembly will not be reduced. This can solve the problem in the prior art that the gap between the piston and the inner wall of the outer shell is too small after the rubber layer is heated due to the rubber layer being wrapped around the outside of the piston.

[0028] 2. The first sealing element of the present invention has an ingenious structure. The sealing lip is inclined, which provides deformation of the sealing lip in the direction of the inner and outer sides of the shell assembly member. This can avoid excessive friction on the inner wall of the shell assembly member, which would affect the responsiveness of the outer piston movement. The depression formed at the connection between the sealing lip and the base weakens the supporting effect of the base on the sealing section, making the sealing section more sensitive when it moves into the piston chamber. The high point of the sealing protrusion of the sealing section is located on the side of the low point of the depression towards the pressure oil chamber, which can provide greater deformation of the sealing section in the direction of the inner and outer sides of the shell assembly member. This ensures the sealing of the pressure oil chamber while reducing the friction on the inner wall of the shell assembly member.

[0029] 3. The base supports the sealing section through the tension section, which can provide tension for the sealing pressure oil cavity of the sealing section. This is beneficial for adjusting the force exerted by the sealing protrusion of the sealing section on the inner wall of the shell assembly, avoiding excessive friction due to excessive force or insufficient force to achieve sealing of the pressure oil cavity.

[0030] 4. An auxiliary support is formed at the connection between the sealing section and the tension section, which can help support the sealing protrusion of the sealing section and avoid excessive weakening of the base's support force on the side of the sealing section near the pressure oil chamber due to the formation of depression.

[0031] 5. The base structure of the first sealing element of the present invention is simple. It is fixed at the corner of the outer piston and extends to the two sides of the outer piston respectively to form a first base section and a second base section. The first base section extends smoothly from the sealing section and tends to and stops on the outer surface of the outer piston, providing a certain traction force on the sealing lip. At the same time, it smoothly transitions to the outer surface of the outer piston. The non-redundant rubber layer reduces the gap between the outer piston and the shell assembly after thermal expansion. The second base section forms a recess with the tension section, making the sealing section more sensitive when it shifts into the piston chamber.

[0032] 6. The inner piston, outer piston, and shell assembly of the present invention form a balanced oil chamber. The inner piston slides against the outer piston through the third seal. When the outer piston moves, the balanced oil chamber can control the pressure relief. Centrifugal force is also generated on the inner side of the outer piston to counteract the centrifugal force on the front of the pressure-bearing part of the outer piston and prevent the outer piston from tilting under the action of the centrifugal force of the unbalanced oil. A reset elastic element can be installed through the inner piston to help push the outer piston to move and reset.

[0033] 7. Multiple protrusions spaced at circumferential intervals can abut against the inner wall of the housing assembly, leaving a gap between the side of the outer piston near the pressure oil chamber and the inner wall of the housing assembly, which facilitates the flow of oil through the gap to fill the pressure oil chamber in the initial state.

[0034] 8. The outer piston seal of the present invention includes a first seal located at the outer corner of the outer piston and a second seal located at the inner corner of the outer piston; the second seal may have the same or different structure as the first seal depending on the actual situation.

[0035] 9. The first sealing member of the present invention is ingeniously designed, providing the included angle range of each segment, which ensures that the first sealing member can seal the pressure oil cavity while reducing the friction of the sealing lip on the shell assembly to a greater extent.

[0036] 10. The method of using the sealing piston device of the present invention fully utilizes the structural characteristics of the sealing piston device of the present invention. By sliding the sealing section against the inner wall of the shell assembly to form a seal on the pressure oil chamber, the oil pressure of the pressure oil chamber is regulated by injecting or extracting oil into the pressure oil chamber, and the movement of the outer piston can be responded to quickly.

[0037] The sealing piston device of the present invention has an ingenious structure. The base of the first sealing element is located at the corner of the outer piston and extends smoothly to both sides of the outer piston, so that there is no redundant rubber layer on the surface of the outer piston. When the oil temperature rises, the sealing lip only expands at the corner to abut against the inner wall of the shell assembly to seal the pressure oil cavity. Since there is no redundant rubber layer on the outer surface of the outer piston, the gap between the outer piston surface and the shell assembly will not be reduced. This solves the problem in the prior art that the gap between the piston and the inner wall of the outer shell is too small after the rubber layer is heated. Attached Figure Description

[0038] Figure 1 : A schematic diagram of the structure of an existing integrated piston seal;

[0039] Figure 2 : A schematic diagram of the piston sealing device of the present invention;

[0040] Figure 3 : A schematic diagram of the first sealing element structure of the present invention;

[0041] Figure 4 Schematic diagram of the outer piston end face structure;

[0042] Figure 5 Schematic diagram of the three-dimensional structure of the external piston;

[0043] Figure 6 : Schematic diagram of the external piston under pressure in this piston sealing device;

[0044] Wherein: 1—clutch shaft; 101—pressure oil chamber; 102—balance oil chamber; 103—first clearance; 104—oil pressure channel; 105—balance oil passage; 2—outer shell; 2-1—outer side of the outer shell; 2-2—end of the outer shell; 3—outer piston; 3-1—first seal; 3-1-1—first base section; 3-1-6—second base section; 3-1-2—sealing section; 3-1-7—sealing protrusion; 3-1-3—support section; 3-1-4—tension section; 3-1-5—recess; 3-2—second seal; 3-3—protrusion; 3-4—pressure bearing section; 3-5—outer side of the outer piston; 3-6—inner side of the outer piston; 4—inner piston; 4-1—third seal; 5—spring; 6—fixing clip; 7—reset elastic element; 9—driven plate; 10—drive plate. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0049] This invention relates to a sealing piston device for the disengagement and coupling of power transmission in a wet clutch. It solves the problem of insufficient clearance between the piston and the inner wall of the outer casing 2 due to the rubber layer covering the piston's outer side causing the rubber layer to heat up. This insufficient clearance, or even the absence of clearance, prevents oil from lubricating the sealing lip, increasing friction between the sealing lip and the casing components, thus affecting the piston's movement sensitivity and the wet clutch's responsiveness. The base of the first seal 3-1 is fixed to the corner of the outer piston 3 near the pressure oil chamber 101, extending smoothly towards both sides of the outer piston 3. This eliminates redundant rubber layers on the outer piston 3 surface. When the oil temperature rises, the sealing lip only expands at the corner to abut against the inner wall of the casing components, sealing the pressure oil chamber 101. Because there is no redundant rubber layer on the outer surface of the outer piston 3, the clearance between the outer piston 3 surface and the casing components is not reduced.

[0050] A sealing piston device, specifically, such as Figures 2-6 As shown, the device includes a shell assembly forming a piston chamber, an outer piston 3, and an outer piston seal. The shell assembly includes a clutch shaft 1 and an outer casing 2 sleeved on the clutch shaft 1, with the outer casing 2 forming a piston chamber between the clutch shaft 1 and the clutch shaft 1. A first gap 103 is provided between the outer piston 3 and the inner wall of the outer casing 2. The outer piston 3 is placed in the piston chamber and can reciprocate along the piston chamber axial direction. The outer piston 3 has a pressure-bearing portion 3-4 that is axially opposite to the end 2-2 of the outer casing, an outer piston outer portion 3-5 that extends from the outside of the pressure-bearing portion 3-4 away from the end 2-2 of the outer casing and is radially opposite to the outer casing outer portion 2-1, and an inner piston outer portion 3-6 that extends from the inside of the pressure-bearing portion 3-4 away from the end 2-2 of the outer casing and is radially opposite to the clutch shaft 1.

[0051] The outer piston seal is located at the corner of the outer piston 3 and does not cover the outer surface of the outer piston 3 away from the corner; the corner is the junction of two adjacent surfaces of the outer piston 3, including the junction of the end face and the side face; the outer piston seal located at the outer corner of the outer piston 3 is the first seal 3-1 that slides against the outer side of the housing assembly (outer outer part 2-1 of the outer shell); the outer piston seal located at the inner corner of the outer piston 3 is the second seal 3-2 that slides against the inner side wall of the piston chamber (clutch shaft 1); the piston chamber has a pressure oil chamber 101 on the side of the outer piston 3 facing the oil pressure channel 104, and the clutch shaft 1 is provided with an oil pressure channel 104 that connects to the pressure oil chamber 101; the outer piston seal includes a base and a sealing lip provided on the base, the base is fixed to the corner of the outer piston 3 near the pressure oil chamber 101 (including the connection between the pressure-bearing part 3-4 and the outer outer part 3-5 of the outer piston), and is flush with the two surfaces of the outer piston 3. Figure 3 The sealing lip extends smoothly from the surface of the pressure-bearing part 3-4 and the outer surface of the outer piston 3-5 to the surface of the outer piston 3. The sealing lip abuts against the inner wall of the piston chamber to seal the pressure oil cavity 101 and slides on the inner wall of the shell assembly (inner wall of the outer shell 2-1 or clutch shaft 1) when the outer piston 3 reciprocates. The base is located at the corner of the outer piston 3 and extends smoothly to both sides of the outer piston 3 to the surface of the outer piston 3, so that there is no redundant rubber layer on the surface of the outer piston 3. When the oil temperature rises, the sealing lip only expands at the corner to abut against the inner wall of the shell assembly to seal the pressure oil cavity 101. Since there is no redundant rubber layer covering the outer surface of the outer piston 3, the first gap 103 is not affected by temperature. Regardless of high or low temperature, the first gap 103 can pass oil well, ensuring the lubrication of the sealing lip and preventing the gap between the surface of the outer piston 3 and the shell assembly from decreasing. This solves the problem in the prior art where the rubber layer covering the outer side of the piston causes the gap between the piston and the inner wall of the outer shell 2 to be too small after the rubber layer is heated.

[0052] It is worth noting that the second seal 3-2 may have the same or different structure as the first seal 3-1, and can be changed accordingly based on the actual situation. That is, when the outer piston seal is used as the first seal 3-1, the second seal 3-2 may adopt other structures to seal the inner side 3-6 of the outer piston with the clutch shaft 1, and vice versa.

[0053] In one embodiment, the first seal 3-1 is described, as follows: Figure 3As shown, the sealing lip abuts against the inner wall of the housing assembly and is inclined towards the pressure oil chamber 101; the sealing lip is integrally formed with the base, and the base is fixed to the corner formed by the connection between the outer side of the outer piston 3-5 and the pressure bearing part 3-4 through a vulcanization process; the sealing lip includes a sealing section 3-1-2 protruding outward from the outer side of the housing assembly; the sealing section 3-1-2 includes a sealing protrusion 3-1-7 that slides against the inner wall of the housing assembly (outer side of the outer shell 2-1 or clutch shaft 1); a depression 3-1-5 is formed at the connection between the sealing lip and the base on the side near the pressure oil chamber 101, and the high point of the sealing protrusion 3-1-7 of the sealing gasket is located on the side of the low point of the depression 3-1-5 towards the pressure oil chamber 101, that is, the high point of the sealing protrusion 3-1-7 is located in the area of ​​the depression 3-1-5 in the direction of pressure from the housing assembly (as shown in the figure, the high point of the sealing protrusion 3-1-7 is to the left of the low point of the depression 3-1-5). The aforementioned recess 3-1-5 is a smooth arc-shaped recess 3-1-5. The arc-shaped recess 3-1-5 has better shear resistance and compressive strength, providing better support for the base to the root of the sealing lip. The inclined setting of the sealing lip provides deformation of the sealing lip in the inner and outer directions of the shell assembly, which can avoid excessive friction on the inner wall of the shell assembly affecting the responsiveness of the movement of the outer piston 3. The recess 3-1-5 formed at the connection between the sealing lip and the base weakens the supporting effect of the base on the sealing section 3-1-2, making the sealing section 3-1-2 more sensitive when it shifts towards the center of the piston chamber. The high point of the sealing protrusion 3-1-7 of the sealing section 3-1-2 is located on the side of the low point of the recess 3-1-5 towards the pressure oil chamber 101, which can provide greater deformation of the sealing section 3-1-2 in the inner and outer directions of the shell assembly, ensuring the sealing of the pressure oil chamber 101 while reducing the friction on the inner wall of the shell assembly.

[0054] Based on the sealing lip including a sealing section 3-1-2 protruding outwards from the shell assembly member, in one embodiment, such as Figure 3 As shown, the sealing lip also includes a tension section 3-1-4, which extends from the sealing section 3-1-2 and is located on the side of the sealing section 3-1-2 near the pressure oil chamber 101. The tension section 3-1-4 supports the sealing section 3-1-2 and provides tension for the sealing section 3-1-2 to seal the pressure oil chamber 101. The root of the tension section 3-1-4 connects to the base to form the aforementioned recess 3-1-5. The base supports the sealing section 3-1-2 through the tension section 3-1-4, which provides tension for the sealing section 3-1-2 to seal the pressure oil chamber 101. This facilitates the adjustment of the force exerted by the sealing protrusion 3-1-7 of the sealing section 3-1-2 on the inner wall of the shell assembly, avoiding excessive friction due to excessive force or insufficient force to seal the pressure oil chamber 101.

[0055] Based on the sealing lip including sealing section 3-1-2 and tension section 3-1-4, in one embodiment, such as Figures 2-3As shown, an auxiliary support portion 3-1-3 is formed at the connection between the sealing section 3-1-2 and the tension section 3-1-4. This auxiliary support portion 3-1-3 is used to assist in supporting the pressure of the sealing protrusion 3-1-7 of the sealing section 3-1-2 on the inner wall of the housing assembly (outer side of the outer housing 2-1 or the clutch shaft 1). The auxiliary support portion 3-1-3 is located on the side of the sealing protrusion 3-1-7 near the pressure oil chamber 101. The auxiliary support portion 3-1-3 may be a thickened protrusion formed between the side towards the pressure oil chamber 101 and the side towards the recess 3-1-5. Due to the inclined setting of the sealing lip, and the sealing protrusion 3-1-7 being located at the low point of the recess 3-1-5 near the pressure oil chamber, the auxiliary support portion 3-1-3 is used to assist in supporting the pressure of the sealing protrusion 3-1-7 of the sealing section 3-1-2 on the inner wall of the housing assembly (outer side of the outer housing 2-1 or the clutch shaft 1). On one side of 101, the tension section 3-1-4 may not provide sufficient support for the sealing protrusion 3-1-7 of the sealing section 3-1-2 to achieve sealing of the pressure oil cavity 101. The auxiliary support part 3-1-3 is located on the side of the sealing protrusion 3-1-7 near the pressure oil cavity 101, which increases the thickness of the sealing lip and can assist in supporting the sealing protrusion 3-1-7 of the sealing section 3-1-2. It provides pressure on the inner wall of the shell assembly component at the end of the sealing lip, and avoids excessive weakening of the support force of the base on the side of the sealing section 3-1-2 near the pressure oil cavity 101 due to the formation of the depression 3-1-5, thus preventing the pressure oil cavity 101 from being sealed.

[0056] An auxiliary support portion 3-1-3 is formed at the connection between the sealing section 3-1-2 and the tension section 3-1-4. In one embodiment, such as... Figures 2-3 As shown, the base is located at the corner of the outer piston 3, including a first base segment 3-1-1 and a second base segment 3-1-6 fixed to two surfaces of the outer piston 3. The first base segment 3-1-1 connects to the sealing segment 3-1-2 and extends smoothly from the sealing segment 3-1-2 to and abuts on the outer surface of the outer piston 3, that is, the surface of the first base segment 3-1-1 extends towards the outer surface of the outer piston 3. Figure 3 The outer surface of the outer piston (shown as outer surface 3-5) smoothly transitions to the outer surface of the outer piston 3; a recess 3-1-5 is formed at the connection between the second base segment 3-1-6 and the tension segment 3-1-4, and extends from the low point of the recess 3-1-5 to the other side adjacent to the outer surface of the outer piston 3. The first base segment 3-1-1 smoothly extends from the sealing segment 3-1-2 and tends to and stops on the surface of the outer piston 3, providing a certain traction force on the sealing lip, while smoothly transitioning to the surface of the outer piston 3. The non-redundant rubber layer reduces the gap between the outer piston 3 and the shell assembly after thermal expansion; the second base segment 3-1-6 and the tension segment 3-1-4 form a recess 3-1-5, making the sealing segment 3-1-2 more sensitive when it shifts into the piston chamber.

[0057] In some embodiments, such as Figure 2As shown, this sealing piston device also includes an inner piston 4 and a reset elastic element 7. The inner piston 4 is placed in the piston chamber, with one end fixed to the shell assembly member and the other end slidably abutting against the outer piston 3 through the third sealing element 4-1, forming a balance oil chamber 102 with the outer piston 3 and the shell assembly member. The shell assembly member is provided with a balance oil passage 105 that communicates with the balance oil chamber 102. The reset elastic element 7 is placed in the balance oil chamber 102 to push the outer piston 3 to move and reset in the direction of reducing the pressure oil chamber 101, that is, to move towards the side closer to the pressure oil chamber 101. In an optional specific solution, one end of the inner piston 4 abuts against the clutch shaft 1, and the piston bracket fixed to the clutch shaft 1 can limit the movement of the inner piston 4 axially. The other end is provided with a third seal 4-1, which slides against the inner wall of the outer piston 3. The reset elastic element 7 is a spring 5 assembly, with both ends of the spring 5 assembly abutting against the inner piston 4 and the outer piston 3 respectively, used to push the outer piston 3 to move and reset towards the pressure oil chamber 101. The spring 5 assembly includes a fixing clip 6 fixed on the side of the outer piston 3 facing the balance oil chamber 102 and a spring 55 with one end clamped to the fixing clip 6, and the other end of the spring 55 abutting against the inner piston 4. The inner piston 4, the outer piston 3, and the housing assembly form the balance oil chamber 102, and the inner piston 4 slides against the outer piston 3 through the third seal 4-1.

[0058] like Figure 6 As shown, the left and right arrows indicate the pressure of the oil on the outer piston bearing part 3-4 under centrifugal force. When the outer piston 3 moves, the balancing oil chamber 102 can control the pressure relief. Since the pressure oil chamber 101 is filled with oil, the oil will generate centrifugal force under the high-speed rotation of the clutch assembly, which will cause uneven pressure on the outer piston 3, thus causing the outer piston 3 to tilt. The balancing oil chamber 102 is designed so that the oil can also generate centrifugal force on the back of the outer piston 3 (left arrow in the figure), which will counteract the effect of the front centrifugal force (right arrow in the figure), thereby ensuring that the pressure on the outer piston 3 is uniform. The reset elastic element 7 can be installed through the inner piston 4, which helps to push the outer piston 3 to move and reset.

[0059] In some embodiments, such as Figure 2 and Figures 4-5 As shown, the outer piston 3 has multiple protrusions 3-3 spaced circumferentially on the side facing the pressure oil chamber 101. When the multiple protrusions 3-3 abut against the inner wall of the shell assembly, a second gap is left between the side of the outer piston 3 near the pressure oil chamber 101 and the inner wall of the shell assembly. This second gap forms the initial size of the pressure oil chamber 101. Figure 3As shown, the protrusion 3-3 can be formed by die stamping, forming a groove on the inner surface of the outer piston 3, so that the protrusion 3-3 and the outer piston 3 are integrally formed, which facilitates the production of the protrusion 3-3 and eliminates the need to fix the separate protrusion 3-3 to the outer piston 3, saving process. Preferably, multiple protrusions 3-3 are arranged in a circumferential array with uniform spacing, and there are 6 protrusions 3-3. They are made of metal, and their shape and structure are less affected by oil temperature. The multiple protrusions 3-3 arranged at circumferential intervals can abut against the inner wall of the shell assembly component, so that the side of the outer piston 3 near the pressure oil chamber 101 leaves a gap with the inner wall of the shell assembly component, which is conducive to the oil flowing into and filling the pressure oil chamber 101 through the gap in the initial state.

[0060] The outer piston 3 has multiple protrusions 3-3 spaced circumferentially on one side facing the pressure oil chamber 101, such as... Figure 2 As shown, the clutch assembly of the sealing piston device of the present invention is located in the piston chamber in the direction of movement of the outer piston 3 at its end; when the outer piston 3 moves away from the pressure oil chamber 101, it can press against the clutch assembly; the clutch assembly includes multiple drive plates 10 and multiple driven plates 9; the drive plates 10 and driven plates 9 are arranged alternately in the direction of movement of the outer piston 3, and the drive plates 10 press against the driven plates 9 under the thrust of the end of the outer piston 3, and the contact friction drives the driven plates 9 to rotate, thereby realizing the rapid response of the clutch and transmitting torque. The drive plates 10 and driven plates 9 can be made of steel plates and friction plates, respectively. The friction plates and steel plates have high static friction, which facilitates transmission.

[0061] An auxiliary support portion 3-1-3 is formed at the connection between the sealing section 3-1-2 and the tension section 3-1-4. In one embodiment, such as... Figure 3 As shown, the included angles between the sealing lip and the connection with the base are explained. The included angle β formed by the first base section 3-1-1 and the sealing section 3-1-2 affects the frictional resistance of the sealing lip. β should be as large as possible while ensuring sealing performance, preferably 150-180°, such as 160-165°. The included angle α formed by the sealing protrusion 3-1-7 of the sealing section 3-1-2 affects the strength and durability of the sealing lip. α should also be as large as possible while ensuring strength. The included angle α ranges from 110-140°, such as 120-130°. The included angle θ of the tension section 3-1-4 in the vertical direction affects the sealing tension of the sealing lip. The tension should be moderate. If the tension is too large, the frictional resistance of the sealing lip will be large; if the tension is too small, it will be difficult to ensure sufficient clamping force after the sealing lip of the outer piston 3 is worn. The included angle θ ranges from 120-150°, such as 130-135°. The first sealing component is cleverly designed with the above-mentioned angles, providing the corresponding included angle range for each segment. While ensuring that the first sealing component 3-1 can seal the pressure oil cavity 101, it also reduces the friction of the sealing lip on the shell assembly component to a greater extent, thereby improving responsiveness.

[0062] In another aspect, the present invention provides a method of using a sealing piston device, wherein the method of using the sealing piston device provided by the present invention includes,

[0063] S1. The base with a sealing lip is fixed to the corner of the outer piston 3, so that the two surfaces of the base extend smoothly towards the corner of the outer piston 3 and tend to stop at the outer side 3-5 surface of the outer piston.

[0064] S2. Place the outer piston 3, which is equipped with the first seal 3-1, into the piston chamber of the shell assembly, so that the sealing section 3-1-2 of the sealing lip slides against the inner wall of the shell assembly to form a seal against the pressure oil chamber 101; specifically, the sealing protrusion of the sealing section 3-1-2 is located on the side of the low point of the depression 3-1-5 close to the pressure oil chamber 101, and the sealing protrusion 3-1-7 abuts against the inner wall of the outer side 2-1 of the outer shell, and can slide along the axial direction of the shell assembly;

[0065] S3. Inject or extract oil into the pressure oil chamber 101 to regulate the oil pressure in the pressure oil chamber 101, so that the outer piston 3 moves back and forth in a direction away from the pressure oil chamber 101.

[0066] According to the present invention, a method for using a sealing piston device is provided. In step S3, oil is injected into or extracted from the pressure oil chamber 101 to regulate the oil pressure within the pressure oil chamber 101, causing the outer piston 3 to reciprocate in a direction away from the pressure oil chamber 101. This includes...

[0067] S31. Oil is injected into the pressure oil chamber 101 through the oil pressure channel 104 to increase the oil pressure in the pressure oil chamber 101, thereby pushing the outer piston 3 to move away from the pressure oil chamber 101.

[0068] S32. The oil discharged from the pressure oil chamber 101 through the oil pressure channel 104 reduces the oil pressure of the pressure oil chamber 101, so that the oil pressure of the outer piston 3 on the opposite side of the pressure oil chamber 101 in the piston chamber is greater than the oil pressure of the pressure oil chamber 101, causing the outer piston 3 to move to the side of the pressure oil chamber 101 to reset.

[0069] According to the present invention, a method of using a sealing piston device is provided. In step S31, oil is injected into the pressure oil chamber 101 through the oil pressure channel 104 to increase the oil pressure of the pressure oil chamber 101 and push the outer piston 3 to move away from the pressure oil chamber 101. This includes, when injecting oil into the pressure oil chamber 101, causing the oil in the balance oil chamber 102 to flow out through the balance oil passage 105, reducing the oil pressure in the balance oil chamber 102, which facilitates the movement of the outer piston 3 to the side away from the pressure oil chamber 101.

[0070] In practical use, multiple components and their structural features provided by this invention can be combined and used together; for example, a first seal 3-1 is provided at the corner of the outer piston 3. The first seal 3-1 includes a base and a sealing lip provided on the base. The sealing lip abuts against the inner wall of the shell assembly (outer side of the outer shell 2-1) and is inclined towards the pressure oil chamber 101. The sealing lip includes a sealing section 3-1-2 with a sealing protrusion 3-1-7 and a tension section 3-1-4 integrally formed with the sealing section 3-1-2. The tension section 3-1-4 is located near the pressure oil chamber of the sealing section 3-1-2. On one side of cavity 101, an auxiliary support portion 3-1-3 is formed at the connection between sealing section 3-1-2 and tension section 3-1-4; the base includes a first base section 3-1-1 and a second base section 3-1-6. The first base section 3-1-1 connects to sealing section 3-1-2 and extends smoothly from sealing section 3-1-2 to and abuts on the outer surface of outer piston 3; a recess 3-1-5 is formed at the connection between second base section 3-1-6 and tension section 3-1-4, and extends from the low point of recess 3-1-5 to another side (including pressure-bearing portion 3-4) adjacent to the outer surface of outer piston 3.

[0071] The sealing lip of the present invention is inclined, and the recess 3-1-5 provides the sealing lip with sensitive and large deformation, giving the sealing lip high toughness. The auxiliary support 3-1-3 provides support for the end of the sealing section 3-1-2. The high point of the sealing protrusion 3-1-7 is located on the side of the low point of the recess 3-1-5 towards the pressure oil chamber 101. When the outer side 2-1 of the outer shell abuts against the sealing protrusion 3-1-7, the setting of the low point of the recess 3-1-5 facilitates the movement of the sealing protrusion 3-1-7 towards the center of the piston chamber, ensuring the sealing of the pressure oil chamber 101 while minimizing the friction with the outer side 2-1 of the outer shell, further improving the responsiveness of the outer piston 3.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A sealed piston device, comprising a shell assembly forming a piston chamber, characterized in that: It also includes, The outer piston (3) is placed in the piston chamber and can reciprocate to push the clutch assembly. The piston chamber is connected to the oil pressure channel (104). The piston chamber is a pressure oil chamber (101) on the side of the outer piston (3) facing the oil pressure channel (104). An external piston seal includes a base and a sealing lip disposed on the base. The base is fixed to the corner of the external piston (3) near the pressure oil chamber (101) and extends smoothly to both sides of the external piston (3) towards the surface of the external piston (3). The sealing lip abuts against the inner wall of the piston chamber to seal the pressure oil chamber (101) and slides on the inner wall of the shell assembly when the external piston (3) reciprocates. The sealing lip abuts against the inner wall of the shell assembly and is inclined toward the pressure oil cavity (101); the sealing lip includes a sealing section (3-1-2) protruding outward of the shell assembly; the sealing section (3-1-2) includes a sealing protrusion (3-1-7) that slides against the inner wall of the shell assembly; a depression (3-1-5) is formed at the connection between the sealing lip and the base on the side near the pressure oil cavity (101), and the high point of the sealing protrusion (3-1-7) of the sealing section (3-1-2) is located on the side of the low point of the depression (3-1-5) toward the pressure oil cavity (101); The sealing lip further includes a tension section (3-1-4), which extends from the sealing section (3-1-2) and is located on the side of the sealing section (3-1-2) near the pressure oil chamber (101), providing tension for the sealing section (3-1-2) to seal the pressure oil chamber (101); the root of the tension section (3-1-4) connects to the base to form the recess (3-1-5). An auxiliary support (3-1-3) is formed at the connection between the sealing section (3-1-2) and the tension section (3-1-4) to assist in supporting the pressure of the sealing protrusion (3-1-7) of the sealing section (3-1-2) on the inner wall of the shell assembly; the auxiliary support (3-1-3) is located on the side of the sealing protrusion (3-1-7) near the pressure oil chamber (101); The base includes a first base segment (3-1-1) and a second base segment (3-1-6) fixed to the two sides of the outer piston (3). The first base segment (3-1-1) connects to the sealing segment (3-1-2) and extends smoothly from the sealing segment (3-1-2) to and abuts on the surface of the outer piston (3). The included angle β formed by the first base segment (3-1-1) and the sealing segment (3-1-2) is 150~180°; the included angle α formed by the sealing protrusion (3-1-7) of the sealing segment (3-1-2) is in the range of 110~140°; and the included angle θ of the tension segment (3-1-4) in the vertical direction is 120~150°.

2. The sealing piston device as described in claim 1, characterized in that: The second base segment (3-1-6) forms the depression (3-1-5) at the connection with the tension segment (3-1-4), and extends from the low point of the depression (3-1-5) to the other side adjacent to the surface of the outer piston (3).

3. A sealing piston device as described in any one of claims 1 to 2, characterized in that: It also includes an inner piston (4) and a reset elastic element. The inner piston (4) is placed in the piston chamber, with one end fixed to the shell assembly and the other end slidably abutting against the outer piston (3) through a third seal, forming a balance oil chamber (102) with the outer piston (3) and the shell assembly. The shell assembly is provided with a balance oil passage (105) that connects to the balance oil chamber (102). The reset elastic element is placed in the balance oil chamber (102) to push the outer piston (3) to move and reset in the direction of the reduced pressure oil chamber (101).

4. A sealing piston device as described in any one of claims 1 to 2, characterized in that: The outer piston (3) has multiple protrusions (3-3) spaced around its circumference on the side facing the pressure oil chamber (101). When the multiple protrusions (3-3) abut against the inner wall of the shell assembly, a second gap is left between the side of the outer piston (3) close to the pressure oil chamber (101) and the inner wall of the shell assembly.

5. A sealing piston device as described in claim 1, characterized in that: The outer piston seal is located at the corner of the outer piston (3) and does not cover the outer surface of the outer piston (3) away from the corner; the outer piston seal located at the outer corner of the outer piston (3) is the first seal (3-1) that slides against the outer side of the shell assembly; the outer piston seal located at the inner corner of the outer piston (3) is the second seal (3-2) that slides against the inner side wall of the piston chamber.

6. A method of using a sealing piston device, characterized in that: The method, using the sealing piston device as described in any one of claims 1 to 5, comprises: The base with a sealing lip is fixed to the corner of the outer piston (3), so that the base extends smoothly to the two surfaces of the corner of the outer piston (3) and tends to stop at the outer surface of the outer piston (3). The outer piston (3) with the outer piston seal is placed in the piston chamber of the shell assembly, so that the sealing section (3-1-2) of the sealing lip slides against the inner wall of the shell assembly to form a seal against the pressure oil chamber (101). Injecting or extracting oil into the pressure oil chamber (101) regulates the oil pressure inside the pressure oil chamber (101), causing the outer piston (3) to reciprocate in a direction away from the pressure oil chamber (101).

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