WO1996028331A1 - Cylindre recepteur de frein commande par un fluide et dote d'un roulement etanche et procede d'assemblage - Google Patents

Cylindre recepteur de frein commande par un fluide et dote d'un roulement etanche et procede d'assemblage Download PDF

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Publication number
WO1996028331A1
WO1996028331A1 PCT/US1995/003093 US9503093W WO9628331A1 WO 1996028331 A1 WO1996028331 A1 WO 1996028331A1 US 9503093 W US9503093 W US 9503093W WO 9628331 A1 WO9628331 A1 WO 9628331A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake actuator
bearing
annular
opening
operated brake
Prior art date
Application number
PCT/US1995/003093
Other languages
English (en)
Inventor
Steven M. Stojic
Francisco J. Alvarez
Original Assignee
Nai Anchorlok, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nai Anchorlok, Inc. filed Critical Nai Anchorlok, Inc.
Priority to PCT/US1995/003093 priority Critical patent/WO1996028331A1/fr
Priority to AU21184/95A priority patent/AU2118495A/en
Publication of WO1996028331A1 publication Critical patent/WO1996028331A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/08—Brake cylinders other than ultimate actuators
    • B60T17/083—Combination of service brake actuators with spring loaded brake actuators

Definitions

  • the invention relates to fluid-operated brake actuators for vehicles and more particularly to spring brake actuators of the type having a spring brake actuator rod reciprocally movable through a sealed opening in a pressure chamber.
  • An air brake system for a vehicle such as a bus, truck or the like typically includes a brake shoe and drum assembly which is actuated by means of an actuator assembly operated by the selective application of a fluid such as compressed air.
  • Conventional air brake actuators have both a service brake actuator for actuating the brakes under normal driving conditions by the application of compressed air and an emergency or spring brake actuator that actuates the brakes when air pressure has been released.
  • the emergency brake actuator includes a strong compression spring that provides the force to apply the brake when air is released. This is often referred to as the spring brake.
  • the spring brake actuator is disposed in tandem with the service brake actuator.
  • the brake In the event of a loss of air pressure or an intentional exhaustion of air from the spring brake actuator, the brake will be mechanically activated by the force of the strong compression spring acting on the spring brake actuator rod which, in turn, acts upon the service brake push rod to apply the brakes.
  • the spring brake portion serves both as a parking brake and an emergency brake.
  • the spring brake push rod typically extends from a chamber in the spring brake portion, through an aperture in a wall, also known as an adaptor plate separating the spring brake actuator from the service brake actuator, and into a chamber in the service brake portion. Because at least one of the adjoining chambers is usually pressurized, a seal is provided at the aperture around the push rod.
  • the seal typically comprises one or more O-rings positioned in annular channels in the wall of the aperture.
  • the construction of the spring brake with an adaptor housing through which a spring brake push rod reciprocates creates two major problems. First, it is necessary to seal the adaptor housing with respect to the push rod to prevent the pressurized air in the brake housing from escaping into the service housing. If the pressurized air were to escape the brake housing, it would lead to an inadvertent application of the emergency brake. Second, the finish of the push rod is subject to abrading by the adaptor housing as it reciprocates through the adaptor housing. The abrading of the push rod finish creates pieces or slivers of metal that are free to move within the spring brake. The metal slivers and chips can cut and puncture the spring brake seal and/or diaphragm, resulting in decreased performance, premature seal wear and, eventually, seal failure.
  • previous spring brakes have employed various types of bearings in combination with a seal within the aperture in the adaptor housing.
  • the bearing has an aperture through which the push rod reciprocates.
  • the bearing separates the push rod from the adaptor housing to reduce the likelihood of abrasion.
  • the bearing is made from a material that will not easily abrade the surface of the push rod.
  • known bearings have been constructed from aluminum, nylon, plastic and bronze.
  • O-ring seals between the bearing and the adaptor housing and/or between the bearing and the push rod.
  • the adaptor housing has a radially directed flange positioned at the lower end of the adaptor housing opening and a longitudinally extending rib positioned at the other end of the adaptor housing opening.
  • a ring-like plastic bearing is positioned within the opening and abuts the radially directed flange.
  • the longitudinal flange is bent or rolled over to secure the bearing within the adaptor housing.
  • O-ring seals are placed between the bearing and the housing and the bearing and the push rod.
  • Another prior art brake utilizes a press-fit oilite bronze bearing within the aperture of an adaptor housing.
  • An O-ring is disposed at the upper end of the oilite bronze bearing to seal the outer portion of the bearing with respect to the adaptor housing.
  • the push rod is received within an aperture in the bronze bearing with the push rod in contact with the bronze bearing instead of with the adaptor housing.
  • Such a brake is sold by Overland Brakes, Inc. of Compton, California.
  • Indian Head Industries makes an adaptor housing having a groove machined within the wall defining a central opening.
  • the bearing is formed by a split axial plastic ring, which is snap-fit within the groove of the adaptor housing.
  • a wiper ring is positioned about the split axial plastic ring to seal the ring chamber from the brake chamber. The machining of the groove complicates the manufacturing of the brake and increases its relative cost.
  • a brake actuator having a bearing comprising a two-piece, tire rim-shaped brass insert that is press-fit within the adaptor housing aperture.
  • the brass insert comprises a base portion and a flared insert portion.
  • the base portion is sealed with respect to the adaptor housing by a quad ring as is the flared insert.
  • the push rod passes through the center of the tire rim-shaped brass insert.
  • Two annular, split-ring, nylon bearings are disposed within the insert. One of the nylon bearings is mounted within the base portion of the brass insert, and the other is mounted within the flared portion of the brass insert.
  • the invention relates to a fluid-operated brake actuator having a pressure chamber at least partially defined by a wall having opposing first and second surfaces. An opening extends between the two surfaces of the wall.
  • a bearing is positioned within the wall.
  • the bearing comprises a body with an aperture.
  • a first flange extends from the body and overlies one of the first and second surfaces of the wall.
  • a second flange extends from the body and overlies the other of the first and second surfaces. At least one of the first and second flanges is inelastically deformed to secure the body within the opening.
  • An actuating rod extends through the aperture of the body and is adapted to reciprocate with respect to the bearing and the wall for alternately actuating and releasing a brake.
  • one of the upper and lower surfaces has a first shoulder and one of the first and second flanges overlies the first shoulder.
  • the other of the upper and lower surfaces can have a second shoulder and the other of the first and second flanges can overlie the second shoulder.
  • a seal can be positioned between one of the first and second flanges and the upper surface to seal the upper surface from the lower surface.
  • the wall opening defines an inner surface and the body defines an outer surface, which is complementary in shape to the inner surface of the wall.
  • the inner surface is preferably oriented at an predetermined first angle with respect to the axis of the opening and the outer surface is oriented at a second angle with respect to the axis of the opening, wherein the second angle is a complement of the first angle.
  • a plurality of spaced ribs can form the outer surface of the body and define a series of alternating peaks and valleys. If the body is press-fit within the opening, the peaks at the outer surface are deformed and partially fill in the valleys.
  • a bearing is adapted to be mounted to a wall having a first and second surface with an opening extending between the first and second surfaces.
  • the bearing comprises a body having a first end and a second end with an aperture extending therebetween.
  • the center line of the aperture defines a longitudinal axis of the body.
  • a flange is integrally formed with the body at one of the first and second ends.
  • the annular flange extends radially from the body with respect to the longitudinal axis and has a diameter greater than the diameter of the opening so that it abuts one of the first and second surfaces when the body is positioned within the opening.
  • An extension is integrally formed with the body at the other of the first and second ends and extends longitudinally from the body with respect to the longitudinal axis. The extension is inelastically deformable.
  • a method of assembling a bearing in a fluid-operated brake actuator comprises the steps of providing a preformed body having an aperture defined by an aperture wall, a flange extending radially at one end of the body and an axial extension at the other end of the body, inserting the preformed body into an opening in a pressure chamber wall so that the flange overlies one of two opposing surfaces in a pressure chamber wall and the axial extension is positioned adjacent the other surface, ultrasonically softening the axial extension and deforming the same so that the axial extension overlies the other surface to secure the body to the wall and form the bearing.
  • a bearing support with a mandrel is provided and the body is positioned on the bearing support so that the mandrel extends through the aperture.
  • the dividing wall is then placed on the body so that the body is received within the opening.
  • the wall is pressed onto the body so that the flange abuts one of the surfaces.
  • the axial extension can be deformed by swaging.
  • the body can have a plurality of deformable ribs and the step of inserting the body further comprises the step of deforming the ribs against the opening wall to press-fit the wall within the opening.
  • FIG. 1 is a cross-sectional view of an air-operat d brake actuator with a bearing according to the invention
  • FIG. 2 is an enlarged view of the bearing of FIG. 1 with the actuator rod removed for clarity;
  • FIG. 3 is a partially cut away side view of the bearing of FIG. 1, in its preassembled state;
  • FIG. 4 is a bottom view of the bearing of FIG 3;
  • FIG. 5 is a partial sectional view of the bearing of FIG. 3 being ultrasonically welded
  • FIG. 6 is an enlarged view of a second embodiment of a bearing according to the invention with the actuator rod removed for clarity and prior to welding;
  • FIG. 7 is an enlarged view of the bearing of FIG. 6 after it is ultrasonically welded
  • FIG. 8 is an enlarged view of a third embodiment of the bearing according to the invention with the actuator rod removed for clarity and prior to welding;
  • FIG. 9 is an enlarged view of the bearing of FIG. 8 after it is ultrasonically welded.
  • FIG. 1 illustrates a fluid-operated brake actuator 10 having a general configuration well known in the art and one of the environments in which the invention will find useful application.
  • the fluid-operated brake actuator 10 comprises a service brake actuator 12 mounted in tandem to a spring chamber or emergency brake actuator 14.
  • a service brake push rod 16 extends from the service brake actuator 12 for reciprocating movement between a retracted position and an extended actuating position relative to the brake actuator 12, and is provided with a clevis (not shown), which is adapted to connect to a conventional brake shoe and drum (not shown) in a standard fashion. Reciprocating motion of the service brake push rod 16 causes the brake to be alternately applied and released.
  • the service brake actuator 12 comprises a cup-shaped service housing section 20 and a double cup-shaped adaptor housing 22 joined together by a clamp 24 to form a service brake chamber 26.
  • the adaptor housing 22 is also sometimes known as a flange case and functions as a dividing wall between the brake actuators 12, 14.
  • a first elastomeric diaphragm 28 (also known a_ the service brake diaphragm) is suspended within the service brake chamber 26, the peripheral edge thereof secured in fluid tight engagement between the cup- shaped service housing section 20 and the service side of the adaptor housing 22 by the clamp 24.
  • the first elastomeric diaphragm 28 thus separates the service brake chamber 26 into two portions: a first service chamber portion 30 and a second service chamber portion 32.
  • the first service chamber portion 30 communicates with a source of pressurized air (not shown) through an air service port 34 in the adaptor housing 22.
  • the second service chamber portion 32 is vented to the atmosphere through at least one opening 36 in the cup- shaped service housing section 20.
  • the first service chamber portion 30 is shown evacuated so that the first elastomeric diaphragm 28 is held against the adaptor housing 22 by the force from compression spring 42.
  • the service brake push rod 16 extends through a central opening 38 in the cup-shaped service housing section 20 and has a pressure plate 40 at the end thereof within the second service chamber portion 32.
  • the pressure plate 40 bears against the first elastomeric diaphragm 28.
  • a compression spring 42 extends between the pressure plate 40 and the interior surface of the cup-shaped service housing section 20.
  • a push rod guide 44 having an annular seat 46 is disposed within the central opening 38 to guide reciprocal movement of the service brake push rod 16 within the central opening 38 and also to receive the end of the compression spring 42 and retain it in position around the central opening 38.
  • the compression spring 42 thus urges the pressure plate 40 and the service brake push rod 16 to a fully retracted position as depicted in FIG. 1.
  • the spring chamber or emergency brake actuator 14 is defined by the spring side of the adaptor housing 22 and a generally cylindrical head
  • a second elastomeric diaphragm 56 is suspended within the spring brake chamber 54, the peripheral edge thereof secured in fluid tight engagement between the cylindrical head 50 and the spring side of the adaptor housing 22 by the clamp 52.
  • the second elastomeric diaphragm 56 thus separates the spring brake chamber 54 into two portions: a first spring chamber portion 58 and a second spring chamber portion 60.
  • the second spring chamber portion 60 is filled with pressurized air supplied through an air service port 62 in the adaptor housing 22 when the emergency brake is in its normal released position as depicted in FIG. 1.
  • the adaptor housing 22 includes a divider wall 64 that separates the adjoining service brake chamber 26 and spring brake chamber 54.
  • a spring brake actuator rod 66 aligned with the service brake push rod 16, has one end extending from the spring brake chamber 54 through a dividing aperture 68 in divider wall 64 for reciprocating motion through the dividing aperture 68 between a retracted position and an actuating position.
  • a bearing assembly 70 according to the invention is provided in the dividing aperture 68 through which the spring brake actuator rod 66 reciprocates.
  • the spring brake actuator rod 66 is cylindrical and has a longitudinal axis.
  • the dividing aperture 68 has an axis defined by its center line.
  • the bearing assembly 70 also defines an aperture 72 that is concentric with the central opening 38. Thus, the bearing assembly 70 and the central aperture share the same axis. Ideally, the longitudinal axis of the actuator rod coincides with the central opening axis during reciprocation.
  • the one end of the spring brake actuator rod 66 terminates in a reaction plate 74 in the first service chamber portion 30.
  • the reaction plate 74 is received in an annular seat 76 when the spring brake actuator rod 66 is in the retracted position as depicted in FIG. 1.
  • the other end of the spring brake actuator rod 66 is press fit in a pressure plate 78.
  • the pressure plate 78 bears against the second elastomeric diaphragm 56.
  • a large force compression spring or power spring 80 is disposed in the first spring chamber portion 58 between the pressure plate 78 and the cylindrical head 50.
  • the spring brake actuator rod 66 will be in the fully retracted position, as depicted in FIG. 1, by means of compressed air in the second spring chamber portion 60.
  • the compression spring 80 one end of which engages the outer end wall of the cylindrical head 50, forces the pressure plate 78 and spring brake actuator rod 66 in the direction of the service brake push rod 16.
  • the force of the compression spring 80 extends the spring brake actuator rod 66 through the dividing aperture 68, thereby moving the reaction plate 74 and applying a force to the first elastomeric diaphragm 28 and pressure plate 40 of the brake actuator 14. This action causes the service brake push rod 16 to be extended toward the actuating position, thereby applying the brake.
  • the pressure plate 78 is adapted to receive a threaded caging bolt 82, which passes through an opening 84 in the cylindrical head 50.
  • a nut 86 is welded to the cylindrical head 50 and threadably receives the threaded caging bolt 82.
  • a hex head nut 87 fixedly mounted to the end of the caging bolt 82, is rotated to unscrew the caging bolt 82 from nut 86 and cylindrical head 50, thereby drawing the threaded caging bolt 82 outwardly and the pressure plate 78 toward the cylindrical head 50.
  • the bearing assembly 70 is mounted within the dividing aperture 68 of the adaptor housing 22 and is in sealing engagement between the adaptor housing 22 and the spring brake actuator rod 66. If the bearing assembly 70 does not satisfactorily seal the second spring chamber portion 60 from the first service brake chamber 30, any pressurized fluid in the second spring chamber portion 60 will leak into the first service brake chamber 30, perhaps resulting in the accidental exhaustion of the second spring chamber portion 60 and the consequent unwanted application of the spring brake.
  • FIGS. 2-4 the dividing aperture 68 and the bearing assembly 70 are shown in greater detail.
  • the dividing aperture 68 is defined by the adaptor housing 22, in part by an annular projection 90 extending into -li ⁇
  • the annular projection 90 defines an upper shoulder 92 and a lower shoulder 94 in the upper and lower surfaces of the divider wall 64, respectively.
  • An annular rim 98 circumscribes the upper shoulder 92.
  • the annular projection 90 has a face 96 that defines a surface against which the bearing assembly 70 is positioned.
  • the face 96 has a slight angle with respect to the axis of the dividing aperture 68 so that the diameter of the aperture at the lower shoulder 94 is less than the diameter at the upper shoulder 92.
  • the bearing assembly 70 generally comprises a bearing or preform 100, a first O-ring 102 and a second O-ring 104.
  • the bearing 100 comprises a main body 110, which is generally ring-like and defines the bearing aperture 72.
  • annular flange 114 extends radially from the body 110 at an upper end thereof.
  • An annular extension 116 extends from the lower end of the body 110.
  • the annular extension 116 is formed so that a portion thereof projects radially with respect to the axis of the body 110 (FIG. 2).
  • the annular extension 116 Prior to assembly, the annular extension 116 extends generally longitudinally with respect to the axis of the preformed body 110 (FIG. 5).
  • the overall shape of the preformed body 110 (see FIG. 2) resembles the frustrum of a cone.
  • the outer sidewall of the body has a shape generally similar to the slope of the face 96 on the annular projection 90.
  • the outer sidewall is formed by a plurality of ribs 118, which are defined by an alternating series of valleys 120 and ridges 122.
  • the ribs 118 are oriented at an angle complementary to the face 96 of the annular projection 90.
  • An annular groove 124 is formed on the interior of the body 110 and is adapted to receive the second O-ring 104.
  • the body 110 is preferably formed of a self-lubricating material, such as Delrin or HDPE (high density polyethylene), which can also be ultrasonically softened for subsequent deformation.
  • the outer diameter of the ribs 118 is preferably just slightly larger than the inner diameter of the face 96 of annular projection 90 at corresponding points on the respective slopes so that when the body 110 is snugly received into the dividing aperture 68 as discussed below, the ribs will be slightly compressed or crushed.
  • FIG. 5 graphically illustrates the assembly process.
  • the adaptor housing 22 will be disposed with the annular rim 98 extending upwardly so that the conical shape of the aperture 68 also opens upwardly.
  • the second O-ring 104 is placed within the annular groove 124 of the bearing body 110.
  • the bearing body 110 is then mounted to a base support 126 from which extends a mandrel 128.
  • the bearing aperture 112 of the bearing body 110 is aligned with the mandrel 128 and pressed onto the base support 126 until the bearing body contacts the base support 126 and the mandrel 128 extends through the bearing aperture 112.
  • the first O-ring 102 is then positioned against the annular flange 114 of the bearing body 110.
  • the bearing body can simply be dropped into the aperture 68 and the base support disposed to insert the mandrel 128 into the bearing aperture 72.
  • the bearing body 110 is now ready to receive the adaptor housing 22.
  • the dividing aperture 68 of the divider wall 64 is axially aligned with the bearing body 110 and is moved axially toward the bearing body 110 by a press 130 to press-fit the bearing body 110 to the adaptor housing 22.
  • the adaptor housing is pressed onto the bearing body 110, the ribs 118 contact the face 96 and are deformed, resulting in the ridges 122 being flattened and partially filling the valleys 120.
  • the adaptor housing 22 is pressed until the rim
  • flange 114 is adjacent the rim 98 and forms a seal gland with the upper shoulder 92, and the annular extension 116 is adjacent to and extends beyond the lower shoulder 94.
  • An ultrasonic horn 132 is associated with the press 130 and is positioned adjacent to the annular extension 116 when the bearing body 110 is press-fit within the adaptor housing 22.
  • the ultrasonic horn 132 emits high frequency vibrations that soften the material of the body 110. Once the material forming the annular extension is softened, the horn 132 deforms the extension, such as by swaging, to extend over the lower shoulder 94 (FIG. 2).
  • the bearing 100 illustrated in FIGS. 1-5 is the pregerrU bearing construction. However, to simplify the molding of the bearing, it may be desirable to mold the bearing as two independent pieces and subsequently join them in the ultrasonically welding process.
  • FIGS. 6-9 illustrate two embodiments in which the bearing is formed of two independent pieces, which are ultrasonically welded or mechanically swaged together.
  • FIGS. 6 and 7 illustrate a second embodiment of the bearing 200 according to the invention.
  • Many of the brake components used in combination with the bearing 200 are similar or identical to the components used in the first embodiment. Therefore, like numerals will be used to identify like parts in the description of the second embodiment of the bearing 200.
  • the bearing 200 comprises a first body portion 202 and a second body portion 204.
  • the first body portion 202 is shaped to receive the second body portion 204 to form a unitary body, when portions of the first body portion 202 and second body 204 are ultrasonically welded together.
  • the first body portion 202 is ring-like and defines a first bearing aperture 208 in which the push rod is received.
  • An annular flange 210 extends circumferentially about the upper end of the first body portion 202 and forms a seal gland with the upper shoulder 92 of the adaptor housing 22 when the first body portion 202 is inserted into the dividing wall aperture 68.
  • the first body portion 202 of the second bearing 200 has an annular wall 212 from which extends an annular extension 216.
  • the annular wall 212 has a plurality of ribs 218, identical to the illustration in FIG. 4, and which are defined by a series of alternating valleys 220 and ridges 222.
  • An annular recess 224 is formed in the first body portion 202 and is open to the first bearing aperture 208.
  • the annular recess 224 is adapted to receive the second O-ring 104.
  • An annular channel 226 is formed in the first body portion 202 below the annular recess 224 and is adapted to receive a portion of the second body portion 204.
  • the first body portion defines at its lower end a second body recess 228, which is adapted to receive the second body portion 204.
  • the second body portion 204 is also ring-like and defines a second bearing aperture 230, which is coaxial with the first bearing aperture
  • the second body portion 204 further comprises an upper planar surface 232 and an opposing lower planar surface 234.
  • a first annular rim 236 extends axially outwardly from the upper planar surface 232 and is adapted to be received within the annular channel 226 of the first body portion 202.
  • a second annular rim 238 extends axially away from the lower planar surface 234.
  • the second body portion 204 is slidably inserted or press-fit into the second body recess 228 until the first annular rim 236 is received within the annular channel 226. In this position, the end of the second annular rim 238 is generally coterminous with the end of the annular extension 216.
  • the method of assembling the bearing 200 is identical to the method of assembling the bearing 100, except for the additional step of assembling the first body portion and the second body portion to form the bearing 200.
  • the bearing 200 can be assembled prior to mounting the bearing 200 within the adaptor housing 22. However, it is possible to first mount the first body portion 202 in the adaptor housing 22 and subsequently insert the first O-ring 104 and then mount the second body portion 204.
  • FIG. 7 illustrates the second bearing 200 after it has been ultrasonically welded.
  • the first body portion 202 and the second body portion 204 are fused or welded at 240 together during the ultrasonic welding process.
  • the annular extension 216 of the first body portion 202 is welded together with the second annular rim 238 of the second body portion 204.
  • the material comprising the annular extension 216 and second annular rim 238 is then swaged by the ultrasonic horn so that it overlies the lower shoulder 94 to lock the second bearing 200 within the dividing aperture
  • the ultrasonic welding process couples the first and second body portions 202 and 204 and simultaneously locks the bearing 200 to the adaptor housing 22.
  • FIGS. 8 and 9 illustrate a third embodiment of the bearing 300 according to the invention.
  • the bearing 300 is similar to the bearing 200 in that it is a two part bearing comprising a first body portion 302 and a second body portion 304.
  • the third bearing mechanically locks the first body portion 302 to the second body portion 304 instead of fusing or welding together the first body portion 302 and the second body portion 304.
  • the first body portion 302 is ring-like and defines a first bearing aperture 308.
  • An annular flange 310 extends circumferentially about the upper end of the first body portion 302.
  • An annular wall 312 defines the outer periphery of the first body portion 302 and has an annular extension 316.
  • a plurality of ribs 318 is disposed on the annular wall 312. The ribs 318 are defined by a series of alternating valleys 320 and ridges 322.
  • An annular recess 324 is formed in the first body portion 302 and is adapted to receive the second O-ring 104.
  • the first body portion 302 of the bearing 300 has an annular groove 314 formed in the annular wall 312 and is sized to received the first O-ring 102.
  • the mounting of the first O-ring 102 in the annular wall is also applicable to the bearings 100 and 200.
  • the annular wall 312 defines a second body recess 328 at its lower portion thereof and in which the second body portion 304 is received.
  • An annular channel 326 is formed between the annular recess 324 and the second body recess and is adapted to receive a portion of the second body portion 304.
  • the second body portion 304 defines a second bearing aperture
  • the second body portion 304 has an upper planar surface 332, which in combination with the annular recess 324 retains the first O-ring 104 within the bearing 300.
  • a lower planar surface opposes the upper planar surface 332 and has formed therein an annular channel 335.
  • a first annular rim 336 extends axially away from the upper planar surface 332 and is sized to be received within the annular channel 326 of the first body portion 302 when the second body portion 304 is received within the second body recess 328.
  • a second annular rim 338 extends away from the second body portion 304 and is separated from the lower planar surface 334 by the annular channel 335.
  • the first annular rim 336 and the second annular rim 338 define the outer periphery of the second body portion 304.
  • the second O-ring 104 is placed within the annular recess 324 and the second body portion 304 is slidably mounted or pressed into the second body recess 328 until the first annular rim
  • the bearing 300 is assembled, the bearing is ready for mounting to the adaptor housing 22.
  • the method of mounting the bearing 300 to the adaptor housing 22 is identical to the method of mounting the bearing 100, except that the bearing 300 must first be assembled as described above. However, the assembly of the bearing 300 can occur prior to the mounting of the first body portion 302 to the adaptor housing or after the mounting of the first body portion 302 to the adaptor housing.
  • FIG. 9 illustrates the bearing 300 after it is ultrasonically swaged.
  • the ultrasonic swaging of the bearing 300 results in the annular extension 316 of the first body 302 being swaged so that a portion of the annular extension overlies the lower shoulder 94 to secure the first body portion 302 to the adaptor housing 22 and a portion of the annular extension 316 overlies the second body portion 304 in such a manner that it fills in a portion or all of the annular channel 335 of the second body portion 304 to mechanically lock the first body portion 302 to the second body portion 304.
  • the bearing and the method for mounting the bearing to the adaptor housing permit the quick and easy mounting of the bearing to the adaptor housing while permitting the adaptor housing to be cast as a single piece.
  • the ultrasonic welding or swaging also unifies the bearing, further simplifying the assembly method.

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Abstract

Un ensemble frein à ressort et membrane combinés à commande pneumatique comporte un cylindre récepteur (10) coopérant avec un cylindre récepteur à ressort. Le cylindre récepteur (12) et le cylindre récepteur à ressort (14) sont séparés par une paroi séparatrice (64) pourvue d'une ouverture annulaire (68) comportant un palier étanche (70) dans lequel la tige (66) du cylindre récepteur à ressort effectue un mouvement de va-et-vient. Le palier étanche comporte un corps annulaire (110) en polymère synthétique pourvu d'un rebord (114) radial et d'une protubérance (116) longitudinale. Le rebord annulaire prend appui sur l'une des faces de la paroi séparatrice, la protubérance étant adoucie aux ultrasons puis déformée de sorte qu'elle prenne appui sur l'autre face de la paroi séparatrice, et que le palier soit fixé à la paroi séparatrice. Le corps annulaire est pourvu d'une rainure annulaire (124) recevant l'élément d'étanchéité (104) constitué d'un joint torique élastomère.
PCT/US1995/003093 1995-03-09 1995-03-09 Cylindre recepteur de frein commande par un fluide et dote d'un roulement etanche et procede d'assemblage WO1996028331A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1995/003093 WO1996028331A1 (fr) 1995-03-09 1995-03-09 Cylindre recepteur de frein commande par un fluide et dote d'un roulement etanche et procede d'assemblage
AU21184/95A AU2118495A (en) 1995-03-09 1995-03-09 Fluid-operated brake actuator with sealed bearing and method of assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1995/003093 WO1996028331A1 (fr) 1995-03-09 1995-03-09 Cylindre recepteur de frein commande par un fluide et dote d'un roulement etanche et procede d'assemblage

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WO1996028331A1 true WO1996028331A1 (fr) 1996-09-19

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WO (1) WO1996028331A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003080418A1 (fr) * 2002-03-21 2003-10-02 Arfesan Arkan Fren Elemanlari San. Ve Tic. A.S. Cylindre de frein à ressort et à plaque d'adaptation pourvue de deux joints toriques pour une meilleure étanchéité
US9969377B2 (en) * 2014-02-14 2018-05-15 Arfesan Arkan Fren Elemanlari Sanayi Ve Ticaret A.S. Center bearing of adapter plate comprising rubber and rigid plastic members developed for spring brake actuators
US10663025B2 (en) 2018-07-31 2020-05-26 Bendix Spicer Foundation Brake Llc Bushing assembly for a spring brake actuator of a vehicle air braking system
CN114294357A (zh) * 2016-05-20 2022-04-08 哈尔德克斯制动器产品公司 带隔膜保持器的弹簧制动致动器

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Publication number Priority date Publication date Assignee Title
US3844010A (en) * 1973-04-30 1974-10-29 Frost & Son C L Method of making a bearing housing assembly
US4817264A (en) * 1987-08-10 1989-04-04 Shur-Lok Corporation Fastener and assembly process
EP0542568A2 (fr) * 1991-11-15 1993-05-19 Bendix Limited Cylindre de frein à ressort
GB2261472A (en) * 1991-11-15 1993-05-19 Bendix Ltd Mounting actuators
WO1994021892A1 (fr) * 1993-03-25 1994-09-29 Nai Anchorlok, Inc. Coussinet d'etancheite pour cylindre de frein hydraulique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844010A (en) * 1973-04-30 1974-10-29 Frost & Son C L Method of making a bearing housing assembly
US4817264A (en) * 1987-08-10 1989-04-04 Shur-Lok Corporation Fastener and assembly process
EP0542568A2 (fr) * 1991-11-15 1993-05-19 Bendix Limited Cylindre de frein à ressort
GB2261472A (en) * 1991-11-15 1993-05-19 Bendix Ltd Mounting actuators
WO1994021892A1 (fr) * 1993-03-25 1994-09-29 Nai Anchorlok, Inc. Coussinet d'etancheite pour cylindre de frein hydraulique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003080418A1 (fr) * 2002-03-21 2003-10-02 Arfesan Arkan Fren Elemanlari San. Ve Tic. A.S. Cylindre de frein à ressort et à plaque d'adaptation pourvue de deux joints toriques pour une meilleure étanchéité
US9969377B2 (en) * 2014-02-14 2018-05-15 Arfesan Arkan Fren Elemanlari Sanayi Ve Ticaret A.S. Center bearing of adapter plate comprising rubber and rigid plastic members developed for spring brake actuators
CN114294357A (zh) * 2016-05-20 2022-04-08 哈尔德克斯制动器产品公司 带隔膜保持器的弹簧制动致动器
US10663025B2 (en) 2018-07-31 2020-05-26 Bendix Spicer Foundation Brake Llc Bushing assembly for a spring brake actuator of a vehicle air braking system

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