Primary gasket for cylinder assembly and cylinder assembly
By designing the central lips with multiple discharge parts, the problem of easy rotation of primary pads when the fluid connecting configuration is solved, and the effect of fluid through small resistance and high central lip bending strength is ensured to ensure that it is ensured that it is ensured that it has ensured it. The normal operation of the cylinder component.
Patent Information
- Application Number
- CN202380045985.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-13
- Filing Date
- 2023-05-10
- Publication Date
- 2025-01-21
AI Technical Summary
In the prior art, the primary liner is susceptible to excessive stress in the fluid communication configuration, causing excessive bending of the outer lip and the central lip, which in turn causes the primary liner to rotate in the primary receiving portion, impairing its ability to return to the fluid isolation configuration, affecting the Normal operation of the cylinder assembly.
Designed a primary pad, which is composed of the prominent part of the middle lip through multiple discharge parts to ensure that the central lips can seamlessly rely on the primary pads when the central lips are sandwiched with the central lip discharge department. The radial wall of the capacity department, thereby reducing the resistance of the fluid passage, reducing the tendency of central lip bending, and improving the bending strength.
Through this design, the resistance of fluid passes is small, and the central lips have a high bending strength, maintaining it stablely, reducing the risk of primary pad rotation, and ensuring the normal operation of the cylinder component.
Smart Images
Figure CN119343553A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a primary gasket for a cylinder assembly and a cylinder assembly for a hydraulic and / or electrohydraulic system of a vehicle. Background Art
[0002] In the field of cylinder assemblies for hydraulic and / or electrohydraulic systems in vehicles, such as brake master cylinders and / or brake actuators, it is known to arrange a floating part movable in a sealed manner in a hollow cylinder, which defines an axial direction AA and a radial direction RR perpendicular to the axial direction.
[0003] The float is axially movable within the hollow cylinder between a rest configuration and at least one advanced configuration to pressurize a fluid (eg, brake fluid) in a pressure chamber within the hollow cylinder.
[0004] When the float is in the rest configuration, the pressure chamber is in fluid communication with the fluid reservoir through the supply conduit. When the float is in the rest configuration, the pressure in the pressure chamber is equal to the pressure in the reservoir. When the float advances axially toward at least one advancing configuration, the pressure chamber and the reservoir are fluidically isolated, such that the fluid in the pressure chamber is pressurized.
[0005] The float can be moved in the axial direction by sliding closely on the primary and secondary washers, which are housed in housings or grooves formed in the wall of the hollow cylinder, namely the primary housing and the secondary housing, respectively. The primary housing and the secondary housing are made in the wall of the hollow cylinder. The supply duct leads radially from the wall of the hollow cylinder to a supply opening, which is arranged between the primary housing and the secondary housing.
[0006] The secondary gasket is adapted to form a static seal and a dynamic seal between the cylinder and the float to prevent fluid in the reservoir and / or the pressure chamber when in fluid communication with the reservoir from flowing into the cylinder in a direction opposite to the pressure chamber. For example, the secondary gasket performs the following functions: hydraulically isolating electromechanical components housed on the side of the cylinder opposite to the pressure chamber and / or preventing leakage of hydraulic fluid in the pressure chamber.
[0007] The primary liner is adapted to keep the fluid in the pressure chamber pressurized, thereby preventing the fluid from flowing from the pressure chamber to the reservoir when the float is in the advanced position in the cylinder. In this case, the primary liner is in a fluid isolation configuration with its back portion against the first radial wall of the primary receiving portion.
[0008] If the hydraulic system requires a further increase in pressure, at least one valve for increasing the pressure in the reservoir is opened to trigger the flow of fluid from the reservoir to the pressure chamber, avoiding the primary gasket from blocking the passage of such fluid, thereby increasing the pressure in the pressure chamber.
[0009] To achieve this function, the primary gasket is a three-lip gasket, which includes an inner lip, a central lip and an outer lip, which protrude from the back to be radially spaced from each other. The inner lip is configured to form a seal with the floating member. The outer lip is configured to form a seal with the outer wall of the primary receiving part when the pressure in the pressure chamber is higher than the pressure in the reservoir, thereby fluidically isolating the pressure chamber from the reservoir. The outer lip is configured to bend toward the central lip when the pressure in the reservoir is higher than the pressure in the pressure chamber, move away from the outer wall of the receiving part, thereby allowing fluid communication between the reservoir and the pressure chamber. When the reservoir pressure exceeds the pressure in the pressure chamber, the primary gasket is configured to slide axially from the fluid isolation configuration to the fluid communication configuration in the primary receiving part, so that the central lip is axially abutted against the second radial wall of the primary receiving part axially opposite to the first radial wall. In some cases, the central lip is also configured to bend toward the inner lip, thereby allowing the reservoir and the pressure chamber to be fluidly connected, thereby allowing the pressure in the pressure chamber to increase.
[0010] Once the at least one valve is closed, the primary gasket is configured to slide axially to the fluid isolation configuration with the back portion abutting the first radial wall until the back portion fluidly isolates the reservoir from the pressure chamber.
[0011] It has been discovered that when the primary liner is overstressed in a fluid communication configuration, the outer and central lips may over-flex, causing the primary liner to rotate in the primary receptacle, which may compromise the primary liner return to the fluid isolation configuration, thereby jeopardizing proper operation of the cylinder assembly.
[0012] Therefore, there is a strong need in the industry to stabilize the primary gasket when operating in a fluid communication configuration, thereby reducing the risk of accidental rotation of the primary gasket, which may hinder fluid flow from the reservoir to the pressure chamber and / or fluid flow from the pressure chamber to the reservoir.
[0013] Therefore, there is a strong sense in the industry to avoid bending of the central lip as much as possible, as bending of the central lip may cause rotation of the primary pad. Summary of the invention
[0014] An object of the present invention is to provide a primary gasket for a cylinder assembly that makes it possible to solve the problems existing in the prior art.
[0015] This object and advantages as well as other objects and advantages are achieved by a primary gasket according to claim 1 and a cylinder assembly according to claim 12 .
[0016] Advantageous embodiments are the subject matter of the dependent claims.
[0017] With the proposed solution, a high degree of fluid passage through the central lip can be ensured, reducing the resistance to fluid passage compared to the prior art.
[0018] By the proposed solution a high degree of fluid passage can be ensured, reducing the tendency of the central lip to bend.
[0019] Through the proposed solution, it is possible to ensure that the central lip abuts against the radial wall of the primary gasket accommodating portion in a seamless manner in the circumferential direction with the central lip discharge clamped therein, thereby ensuring on the one hand that the resistance to fluid passage is small, and on the other hand that the central lip has high bending strength or structural strength, keeping the central lip stably abutted. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Further features and advantages of the primary gasket and cylinder assembly will become apparent from the following description of a preferred embodiment given by way of non-limiting example and with reference to the accompanying drawings, in which:
[0021] - Figure 1 is an isometric view of a primary gasket according to the present invention, showing an annular gasket body having an inner lip, an outer lip and a central lip protruding in an axial direction from a gasket back portion, wherein the central lip includes a plurality of protrusions intercalated by a plurality of discharges;
[0022] - Figure 2 Seen from the opposite direction Figure 1 an axonometric view of a primary pad in , showing a back portion of the primary pad;
[0023] - Figure 3 Shows Figure 1 A front view of the primary pad in;
[0024] - Figure 4 Shows a cross section along parallel planes Figure 1 The pad in the Figure 1 The pads include Figure 3 A radial direction R'-R' in which the central lip is intercepted at a discharge portion of the plurality of discharge portions;
[0025] - Figure 5 Shows a cross section along parallel planes Figure 1 The pad in the Figure 1 The pads include Figure 3 The radial direction RR shown in , wherein the central lip is intercepted at a protrusion among the plurality of protrusions;
[0026] - Figure 6is an isometric view of a cylinder assembly according to the invention, for example a brake master cylinder actuable by a rod to pressurize a fluid or a linear actuator governed by an electric motor to pressurize a brake fluid for a brake-by-wire (BBW) type system;
[0027] - Figure 7 is the intersection plane perpendicular to the axial direction XX and the radial direction RR Figure 6 A cross-sectional view of a cylinder assembly in FIG. 1 is shown showing a floating member or piston slidably received in a floating member receiving portion, the floating member receiving portion being provided by means of Figure 1 The primary gasket and the secondary gasket are formed in the sealing cylinder. DETAILED DESCRIPTION
[0028] According to a general embodiment, a primary gasket for a cylinder assembly is indicated by reference numeral 1. The cylinder assembly 100 includes a cylinder 101 and a floating member 102, which is slidably received in a floating member receiving portion 104 defined by a cylinder wall 103 of the cylinder 101 to pressurize a fluid. For example, the cylinder assembly 100 is a brake master cylinder or an electric control actuator. According to an embodiment, the electric control actuator is a linear actuator.
[0029] The primary gasket 1 comprises an annular body 2 extending in a circumferential manner at least along a circumferential direction CC around the axial direction XX, wherein the primary gasket 1 defines a radial direction RR perpendicular to the axial direction XX and the circumferential direction CC.
[0030] The annular body 2 is configured to be housed in a primary gasket receptacle 105 which is defined in the cylinder wall 103. The primary gasket receptacle 105 is delimited radially by an axial receptacle wall 107 and axially by a first radial receptacle wall 108 and a second radial receptacle wall 109 which are connected to the axial receptacle wall 107 as undercuts.
[0031] The annular body 2 comprises an inner lip 4 , a central lip 5 , an outer lip 6 and a back portion 3 .
[0032] The back portion 3 comprises a back abutment surface 13 which is configured to abut against a first radial receptacle wall 108 of the primary gasket receptacle 105 .
[0033] The inner lip 4 , the central lip 5 and the outer lip 6 extend from the back portion 3 in the axial direction XX and are spaced apart from each other in the radial direction RR from the side opposite to the back abutment surface 13 .
[0034] The inner lip 4 is configured to form a dynamic seal and a static seal with the floating member 102 .
[0035] The outer lip 6 is configured to form a seal with the axial housing wall 107 .
[0036] The central lip 5 comprises an annular root 14 extending axially between the back portion 3 and a root edge 15 .
[0037] The central lip 5 comprises a plurality of projections 10 , 9 , wherein each projection 10 , 9 projects axially from a root edge 15 .
[0038] The plurality of projections 10 , 9 and the root edge 15 define the plurality of discharge portions 8 .
[0039] Each discharge portion 8 is defined circumferentially by each of the plurality of protrusions 10, 9 and a first adjacent protrusion 9 of the protrusion 10, and each discharge portion 8 is defined axially by a free edge portion of a root edge 15, the free edge portion of the root edge 15 extending between each protrusion 10 and a first adjacent protrusion 9 of the protrusion 10.
[0040] Each projection 10 , 9 is extended by a projection extension G in the circumferential direction.
[0041] Each discharge portion 8 is extended by a discharge portion extension L in the circumferential direction.
[0042] Advantageously, the sum of the extensions L of each discharge is greater than the sum of the extensions G of each projection.
[0043] According to an embodiment, the sum of each discharge extension L and each projection extension G is equal to the circumferential extension of the root edge 15 .
[0044] According to an embodiment, the sum of each drain extension L is at least twice the sum of each protrusion extension G.
[0045] According to an embodiment, the sum of each drain extension L is at least three times the sum of each protrusion extension G.
[0046] According to an embodiment, the protrusions of the plurality of protrusions 10 are equidistant from each other along the discharge portion extension L in the circumferential direction.
[0047] According to the embodiment, each protrusion 10 and each first adjacent protrusion extend along the protrusion extension G in the circumferential direction.
[0048] According to an embodiment, the drain extension L and the protrusion extension G are at least equal.
[0049] According to an embodiment, the drain extension L is equal to at least twice the projection extension G.
[0050] According to an embodiment, the drain extension L is between at least three times the protrusion extension G and at least five times the protrusion extension G.
[0051] Since the sum of the extensions of the discharge portions is arranged to be higher than the sum of the extensions of the projections, a high degree of fluid passage can be achieved when the projections 9 , 10 abut against the second radial receiving portion wall.
[0052] According to an embodiment, each protrusion 9, 10 comprises a protrusion body 17 protruding from the annular root 13 and a protrusion head 18 connected to the protrusion body 17. The protrusion head is configured to abut against the second radial receiving wall 109 to avoid the root edge abutting against the second radial receiving wall 109, thereby allowing fluid to pass through the plurality of discharges 8.
[0053] According to an embodiment, the projection extension G is equal to the maximum circumferential dimension of the projection body 17 at the connection with the root edge 15 .
[0054] According to an embodiment, the discharge extension L is equal to the circumferential distance between two first adjacent projection bodies along the root edge 15 .
[0055] According to an embodiment, the annular root 13 has a root extension M in the axial direction between the back portion 3 and the root edge 15 .
[0056] According to an embodiment, each projection 9 , 10 has an axial projection extension N between the root edge 15 and the projection end in the axial direction.
[0057] According to an embodiment, the axial root extension M is between two times the axial projection extension N and six times the axial projection extension N.
[0058] By providing an annular root 14 and projections 9, 10 projecting from the root edge 15, the discharge portion 8 can be made as a radial opening, the radial opening having a circumferential extension and an axial extension, the circumferential extension being equal to the discharge portion extension and the axial extension being equal to the axial projection extension N, wherein the radial opening is spaced apart from the back portion 3 by at least the axial root extension M, thereby ensuring a high bending resistance with respect to the central lip.
[0059] According to an embodiment, the protrusion body 17 is cylindrical and / or prismatic in shape. According to an embodiment, each protrusion body 17 is cylindrical and / or prismatic in shape. According to an embodiment, the protrusion head 18 and / or each protrusion head 18 is tapered relative to the protrusion body 17.
[0060] According to an embodiment, the lug head 18 is made in one piece with the lug body 17 .
[0061] According to an embodiment, the or each protrusion head 18 is cylindrical in shape.
[0062] According to an embodiment, the protrusion head 18 and / or each protrusion head 18 has an inverted rounded shape in the opposite direction to the annular root. According to an embodiment, the protrusion head 18 is in a hemispherical crown shape or a spherical crown shape to abut against a circular surface. According to an embodiment, the protrusion head 18 has an apex portion, the apex portion has a partial spherical crown shape, and the apex portion is connected to a connecting portion having a tapered side wall, which tapers from the protrusion body 17 to the apex portion.
[0063] By providing a cylindrical protrusion body and / or a rounded protrusion head 18, the exposed surface area of the protrusion in a direction perpendicular to the fluid passage direction can be reduced, thereby allowing a reduction in fluid passage resistance.
[0064] According to an embodiment, each of the plurality of drains 8 has a substantially U-shaped profile.
[0065] According to an embodiment, the root edge 15 is an annular edge and tapers in the axial direction, thereby avoiding comprising a flat surface perpendicular to the axial direction.
[0066] According to an embodiment, the inner lip 4 , the outer lip 6 and the annular root 14 have substantially the same axial dimensions in the axial direction XX.
[0067] According to an embodiment, the number of the plurality of protrusions 9 , 10 is between 10 and 100, preferably, the number of the plurality of protrusions 9 , 10 is between 20 and 60, and even more preferably, the number of the plurality of protrusions 9 , 10 is 30.
[0068] According to an embodiment, the gasket body is made of a polymer material for gaskets, for example a gasket rubber, preferably EPDM (ethylene propylene diene monomer).
[0069] The present invention also relates to a cylinder assembly 100 for a brake system.
[0070] The cylinder assembly 100 comprises a cylinder 101. The cylinder 101 comprises a cylinder wall 103 which internally delimits a floater housing 104. The cylinder wall 103 delimits a pressure chamber which is fluidically connectable to a brake device. The cylinder wall 103 delimits a primary pad housing 105 and a secondary pad housing 106. The cylinder 101 defines a supply conduit 111 which is fluidically connectable to a reservoir and / or a fluid feed valve, wherein the supply conduit 111 leads to a supply opening 112 which is located on the cylinder wall 103 between the primary pad housing 105 and the secondary pad housing 106.
[0071] The cylinder assembly 100 includes a float 102. The float 102 is slidably received in a float receiving portion 104 in a sealing manner to pressurize a fluid in a pressure chamber 110, and the pressure chamber 110 is fluidically connectable to a brake device.
[0072] The cylinder assembly 100 includes a primary liner 1 according to any of the aforementioned embodiments. The primary liner 1 is accommodated in a primary liner accommodation portion 105, wherein an axial gap is provided between a first radial accommodation portion wall 108 and a second radial accommodation portion wall 109. When the primary liner 1 abuts against the first radial accommodation portion wall 108, the primary liner 1 forms a seal with the floating member 102 and the axial wall 107 of the primary accommodation portion, thereby fluidically isolating the pressure chamber from the supply pipe 111. When the primary liner 1 abuts against the second radial accommodation portion wall 109, the primary liner 1 forms a seal with the floating member 102, avoiding the formation of a seal with the axial wall 107 of the primary accommodation portion, thereby fluidly connecting the supply pipe 111 and the pressure chamber 110 to increase the fluid pressure.
[0073] The cylinder assembly 100 includes a secondary gasket 115 received in the secondary gasket receiving portion 106 to form a static seal and a dynamic seal with the float and the cylinder wall 103 .
[0074] According to an embodiment, the secondary cushion 115 is a double-lip cushion.
[0075] According to an embodiment, the cylinder assembly 100 is a brake master cylinder.
[0076] According to an embodiment, the cylinder assembly 100 is an actuator for brake-by-wire (BBW) applications.
[0077] According to an embodiment, the cylinder assembly 100 includes an actuator motor 113 .
[0078] According to an embodiment, the cylinder assembly 100 includes an elastic element 114 housed inside the cylinder 101 , and the elastic element 114 constantly biases the floating member 102 in a direction opposite to the advancing direction of the floating member.
[0079] According to an embodiment, the float 102 is movable in an axial direction between a rest configuration and at least one advanced configuration to pressurize a fluid (eg, brake fluid) in a pressure chamber.
[0080] According to an embodiment, the primary liner 1 can be moved axially in the primary liner housing between a fluid isolation configuration and a fluid communication configuration, in which the back portion 3 abuts against the first radial housing wall and the outer lip forms a seal with the axial wall, and the inner lip forms a seal with the floating member 102, and in the fluid communication configuration, the protrusions 10, 9 abut against the second radial housing wall and the outer lip is spaced apart from the axial wall, and the inner lip forms a seal with the floating member 102.
[0081] According to an embodiment, the float comprises a float body having a hollow portion defined by a float wall, wherein the hollow portion is fluidly connected to the pressure chamber, wherein the float wall has a through hole. The pressure chamber is in fluid communication with the supply conduit through the through hole, as long as the through hole is arranged between the primary pad and the secondary pad. When the float is in an advanced configuration, wherein the through hole is advanced axially relative to the primary pad, the pressure chamber is fluidly isolated from the supply conduit by the primary pad in a fluid isolation configuration, and the float pressurizes the fluid in the pressure chamber. When the fluid in the supply conduit exceeds the fluid pressure in the pressure chamber, the primary pad switches to a fluid communication configuration, thereby allowing the pressure in the pressure chamber to increase.
[0082] Reference numerals list
[0083] 1 Primary pad
[0084] 2 Ring body
[0085] 3 Back part
[0086] 4 Inner lip
[0087] 5 Central lip
[0088] 6 Outer lip
[0089] 7 Central lip abutment
[0090] 8 Multiple discharge sections
[0091] 9 First adjacent protrusion
[0092] 10 Protrusion
[0093] 11 Inner lip end
[0094] 12 External lip end
[0095] 13 Back contact surface
[0096] 14 Ring root
[0097] 15 Root edge
[0098] 16 Free edge section
[0099] 17 Protrusion body
[0100] 18 Protrusion head
[0101] 100 cylinder assembly
[0102] 101 cylinder
[0103] 102 Floating parts
[0104] 103 Cylinder wall
[0105] 104 floating member receiving portion
[0106] 105 Primary receiving portion or primary cushion receiving portion
[0107] 106 Secondary receiving portion or secondary gasket receiving portion
[0108] 107 Axial wall of the primary receiving portion
[0109] 108 First radial wall of the primary receiving portion
[0110] 109 Second radial wall of the primary receiving portion
[0111] 110 Pressure Chamber
[0112] 111 Supply pipeline
[0113] 112 Supply opening
[0114] 113 Actuator Motor
[0115] 114 elastic element
[0116] 115 Secondary pad
[0117] XX Axial direction
[0118] RR Radial direction
[0119] L Circumferential discharge extension
[0120] G Circumferential protrusion extension
[0121] N Axial protrusion extension
[0122] M Axial root extension.
Claims
1. A primary gasket (1) for a cylinder assembly (100), wherein: The cylinder assembly (100) comprises a cylinder (101) and a floating member (102), wherein the floating member (102) is slidably accommodated in a floating member accommodation portion (104) defined by a cylinder wall (103) of the cylinder (101) to pressurize a fluid. wherein the primary gasket (1) comprises an annular body (2) extending circumferentially at least along a circumferential direction (CC) around an axial direction (XX), wherein the primary gasket (1) defines a radial direction (RR) perpendicular to the axial direction (XX) and the circumferential direction (CC), wherein the annular body (2) is configured to be received in a primary liner receiving portion (105) defined in the cylinder wall (103), wherein the primary liner receiving portion (105) is delimited radially by an axial receiving portion wall (107) and axially by a first radial receiving portion wall (108) and a second radial receiving portion wall (109), the first radial receiving portion wall (108) and the second radial receiving portion wall (109) being connected to the axial receiving portion wall (107) in an undercut manner, The annular body (2) comprises an inner lip (4), a central lip (5), an outer lip (6) and a back portion (3). wherein the back portion (3) comprises a back abutment surface (13), the back abutment surface (13) being configured to abut against the first radial receiving portion wall (108) of the primary gasket receiving portion (105), wherein the inner lip (4), the central lip (5) and the outer lip (6) extend axially from the back portion (3) on the side opposite to the back abutment surface (13) and are radially spaced apart from each other, wherein the inner lip (4) is configured to form a seal with the floating member (102), wherein the outer lip (6) is configured to form a seal with the axial receiving portion wall (107), wherein the central lip (5) comprises an annular root (14) extending axially between the back portion (3) and a root edge (15), wherein the central lip (5) comprises a plurality of protrusions (10, 9), wherein each protrusion (10, 9) protrudes axially from the root edge (15), wherein the plurality of protrusions (10, 9) and the root edge (15) define a plurality of discharge portions (8), wherein each discharge portion (8) is defined by each protrusion (10) of the plurality of protrusions (10, 9) and one protrusion (9) of the first adjacent protrusion (9) of the protrusion (10) and by a free portion of the edge of the root edge 15, the free portion of the edge of the root edge extending between each protrusion (10) and the first adjacent protrusion (9) of the protrusion (10), Each protrusion (10, 9) has a protrusion extension (G) extending in the circumferential direction. Each discharge portion (8) is extended with a discharge portion extension portion (L) in the circumferential direction, wherein the sum of each discharge portion extension portion (L) is greater than the sum of each protrusion extension portion (G).
2. Primary pad (1) according to the preceding claim, comprising at least one or a combination of the following features: in, the sum of the extensions of each drain (L) is at least twice the sum of the extensions of each protrusion (G), and / or, wherein the sum of each discharge portion extension (L) is at least three times the sum of each protrusion portion extension (G), and / or, wherein the protrusions of the plurality of protrusions (10) are equidistant from each other in the circumferential direction along the discharge portion extension (L), And / or, wherein each protrusion (10) and each first adjacent protrusion extend along the protrusion extension portion (G) in the circumferential direction.
3. Primary cushion (1) according to the preceding claim, comprising at least one or a combination of the following features: in, The discharge portion extension (L) is at least equal to the protrusion portion extension (G), and / or, wherein the discharge portion extension (L) is equal to at least twice the protrusion portion extension (G), and / or, Wherein, the discharge portion extension (L) is between at least three times the protrusion portion extension (G) and at least five times the protrusion portion extension (G).
4. The primary cushion (1) according to any one of the preceding claims, comprising at least one or a combination of the following features: in, Each protrusion (9, 10) comprises: a protrusion body (17) protruding from the annular root (13); and a protrusion head (18) connected to the protrusion body (17), wherein the protrusion head is configured to abut against the second radial receiving portion wall (109) to prevent the root edge from abutting against the second radial receiving portion wall (109), thereby allowing fluid to pass through the plurality of discharge portions (8), and / or, wherein the annular root (13) has a root extension (M) in the axial direction between the back portion (3) and the root edge (15), wherein each projection (9, 10) has an axial projection extension (N) between the root edge (15) and the projection end in the axial direction, Wherein, the axial root extension (M) is between twice the axial protrusion extension (N) and six times the axial protrusion extension (N).
5. Primary cushion (1) according to the preceding claim, comprising at least one or a combination of the following features: in, The protrusion body (17) and / or each protrusion body (18) has a cylindrical shape and / or a prismatic shape, And / or, wherein the protrusion head (18) and the protrusion body (17) are made in one piece; And / or, wherein the protrusion head (18) and / or each protrusion head (18) is tapered relative to the protrusion body (17).
6. Primary pad (1) according to any one of the preceding claims 4 to 5, in, The protrusion head (18) and / or the protrusion head (18) has a cylindrical shape, The protrusion head (18) and / or each protrusion head (18) has an inverted circular shape in the direction opposite to the annular root, so that the protrusion head (18) and / or each protrusion head (18) abuts against a circular surface, for example, the protrusion head (18) and / or each protrusion head (18) having an inverted circular shape in the direction opposite to the annular root is in the shape of a hemispherical crown or a spherical crown.
7. Primary pad (1) according to any one of the preceding claims 4 to 6, in, Each of the plurality of discharge portions (8) has a substantially U-shaped profile, And / or, wherein the root edge (15) is an annular edge.
8. The primary cushion (1) according to any one of the preceding claims, comprising at least one or a combination of the following features: in, The inner lip (4), the outer lip (6) and the annular root (14) have substantially the same axial dimensions in the axial direction (XX), and / or, Wherein, the primary pad (1) has 10 to 90 of the plurality of protrusions (9, 10), preferably, the primary pad (1) has 20 to 60 protrusions, and even more preferably, the primary pad (1) has 30 protrusions.
9. A cylinder assembly (100) for a brake system, the cylinder assembly (100) comprising: - a cylinder (101), The cylinder (101) comprises a cylinder wall (103), and the cylinder wall (103) defines a floating accommodation portion (104) inside. The cylinder wall (103) defines a pressure chamber, which can be connected to the brake device in a fluidic manner. wherein the cylinder wall (103) defines a primary gasket accommodation portion (105) and a secondary gasket accommodation portion (106), wherein the primary gasket accommodation portion (105) is defined radially by an axial accommodation portion wall (107) and axially by a first radial accommodation portion wall (108) and a second radial accommodation portion wall (109), wherein the first radial accommodation portion wall (108) and the second radial accommodation portion wall (109) are connected to the axial accommodation portion wall (107), wherein the cylinder (101) defines a supply conduit (111) which is fluidically connectable to a reservoir and / or a fluid feed valve, wherein the supply conduit (111) leads to a supply opening (112) on the cylinder wall (103) between the primary gasket receiving portion (105) and the secondary gasket receiving portion (106), - floating member (102), The floating member (102) is accommodated in the floating member accommodation portion (104) in a sealed and slidable manner to pressurize the fluid in the pressure chamber (110), and the pressure chamber (110) and the brake device can be connected in a fluid manner. - A primary gasket (1) according to any one of the preceding claims, wherein the primary gasket (1) is accommodated in the primary gasket accommodating portion (105), wherein an axial gap is provided between the first radial accommodating portion wall (108) and the second radial accommodating portion wall (109), wherein the primary gasket (1) is configured to form a seal with the floating member (102) when the primary gasket (1) abuts against the first radial accommodating portion wall (108), the primary accommodating portion axial wall (107) fluidically isolates the pressure chamber from the supply pipe (111), and wherein the primary gasket (1) is configured to form a seal with the floating member (102) when the primary gasket (1) abuts against the second radial wall (109) to prevent the formation of a seal with the primary accommodating portion axial wall (107), thereby fluidically connecting the supply pipe (111) and the pressure chamber (110) to increase the fluid pressure in the pressure chamber, - A secondary gasket (115), the secondary gasket (115) being received in the secondary gasket receiving portion (106) so that the secondary gasket (115) forms a static seal and a dynamic seal with the floating member (102) and the cylinder wall (103).
10. Cylinder assembly (100) according to the preceding claim, wherein The cylinder assembly (100) is a master cylinder, or the cylinder assembly (100) is an actuator for brake-by-wire (BBW) applications.