TWM497209U - Disc brake assembly - Google Patents

Abstract

A disc brake having one or multiple axially movable rotor discs with annular friction surfaces disposed axially between an annular piston in an annular pressure cavity formed in a housing and annular reaction plate attached to the piston. Friction pads are provided on the reaction plate and also on an axially movable annular reaction disc disposed between the rotor discs. A positioning plate is disposed between the piston and rotor discs and has axially movable poppets thereon, each with a friction pad for contacting the adjacent rotor disc. Individual springs on each poppet bias the poppet pads, rotor discs and friction pads axially together to provide a desired initial braking torque. Upon fluid pressure applied in the piston cavity, the housing moves the positioning plate to move the poppets to release braking torque.

Description

Disc brake assembly

The present invention relates to a disc brake assembly having one or more rotating discs having an annular friction surface thereon against which a fixed friction pad is pressed for applying a braking force to Rotate the disc. In particular, the present invention relates to a disc brake of the type having a brake friction pad that is advanced by a spring into contact with an annular friction surface on a rotor disc for providing a desired braking force starting or starting torque on the disc. . This type of disc brake responds to the applied hydraulic pressure in an annular pressure chamber by an annular piston to axially move the piston to disengage the piston pad from the annular disc and thereby release the braking force on the disc.

Disc brakes of the above type are used in heavy machinery applications such as oil well rigs and surface mining equipment; and can serve as an emergency stop brake in certain applications. One example of this type of brake employs a rotor disc having a diameter of 50 inches (127 cm) and having a starting or starting torque of 5,578,000 in-lbs (630,282 Newton meters).

Referring to Figures 6 and 7, the friction pad has heretofore been mounted on a pressure plate 1 fixed to a casing 2 by spacers 4 and bolts 5 which form an annular pressure chamber 3. One of the annular pistons 6 disposed in the chamber 3 has an aperture that is slidably positioned above the spacer 4. The pressure plate 1 has an aperture slidably received above the spacer 7; and the piston 6 is fixed to a ring-shaped fixed mounting plate 8 by a circumferential array of the stud 19 and the lock nut 19a above the spacer 7 so that the cavity The pressurization of the fluid causes axial movement of the outer casing and the pressure plate 1. The rotor discs 9, 10 are received above a drive hub 11 and splined over them to permit axial movement of the discs relative to the hub 11 on the splines 10 while maintaining rotational drive engagement with the hub. complex A plurality of brake compression springs 12 are disposed in a circumferential array of surrounding pistons 6, wherein one end of each spring is aligned against the piston 6 and the opposite ends of the springs are aligned against the pressure plate 1. In operation, in the absence of hydraulic pressure in the chamber 3, the spring 12 presses the pressure plate 1 and the outer casing 2 in a leftward direction in one of FIGS. 6 and 7, thereby compressing the rotor disk against the annular friction surface of the rotor. The sheet 9 is placed with the friction pad 14 and moves the rotor disc 9 into contact with a friction pad 15 mounted on an axially movable annular reaction plate 16, which is slidably axially movable on the spacer 7, but The rotation is restricted by the bolt 19 and the spacer 7. The reaction plate 16 has a friction pad 17 disposed therearound that presses against an annular friction surface on a second rotor disk 10 that axially moves against the friction pad 18 provided on the pressure plate 1 thereby All friction surfaces on the rotor compress all of the friction pads and achieve a desired stopping torque.

In operation, when fluid pressure is applied in the chamber 3, the outer casing 2 moves and moves the pressure plate 1 in a right direction, which compresses the spring 12 against the pressure plate 1, thereby releasing the friction pads 14, 15, 17 The pressure on the movable plate 16, the rotor disks 9, 10 and the pressure plate 1 is used to release the braking force on the rotor disks 9, 10.

The prior art brake described above has been subjected to cantilever axial deflection of the radially inward region of the pressure plate 1 during operation by the spring 12 such that the radially inner portion of the pressure plate 1 is in the left axis in FIGS. 6 and 7. Deflection, which results in a braking force that is positioned on a radially inward region of the rotor disc; and thus provides less than a desired initial stopping torque level in the event of a brake engagement. Accordingly, it is desirable to provide a manner and means for eliminating the effects of bending of the reaction assembly of a one-disc brake and thereby achieving a desired initial stopping torque for a given design force level on the friction pad by the spring.

The present invention provides a disc brake assembly having one or more rotor discs having an annular friction surface on opposite axial sides thereof, wherein the disc can be splined Connected to a rotating shaft for axial movement. An annular housing has an annular piston chamber in which an annular piston is disposed to form a fluid pressure chamber. The piston is bolted Attached to an annular fixed mounting plate and axially spaced therefrom by spacers. A locating plate is axially disposed between the piston and the adjacent rotor disk and has a plurality of circumferentially and radially spaced apertures provided therein. Each of the locating plate apertures has a movable carriage disposed therein for movement relative to its limited axial direction, each bracket having a friction surface provided thereon adjacent one of the rotor disks. Each of the brackets is axially biased such that the friction surface thereon is urged against the adjacent rotor disc by a spring disposed between the bracket and the piston; and the force of the friction surface on the bracket against The friction pad axially moves the rotor and moves the friction pad axially against one of the movable reaction plates between the rotor and the rotor disc and the bolt to the mounting plate of the piston to achieve a braking force under the force of the spring. The carriage is maintained in its desired position around the adjacent rotor disk or otherwise moved a limited amount in the axial direction under the advancement of the spring. After introducing the fluid pressure into the fluid pressure chamber, the outer casing and the positioning plate move axially away from the mounting plate; and after the outer casing and the positioning plate move further, the bracket and the friction surface thereon are in contact with the adjacent rotor Release and thus the braking force is released.

The brake assembly of the present invention thus provides for the desired braking force to be actuated by the springs individually against the rotor disc advancement bracket and thus provides a uniform braking force on the friction surface of the rotor disc independently of the deflection of the positioning plate, whereby The required initial stopping torque is achieved.

1‧‧‧ Pressure plate

2‧‧‧ Shell

3‧‧‧Circular pressure chamber

4‧‧‧ spacers

5‧‧‧ bolt

6‧‧‧Circular Piston

7‧‧‧ spacers

8‧‧‧Ring fixed mounting plate

9‧‧‧Rotor disc

10‧‧‧Rotor disc

11‧‧‧ drive hub

12‧‧‧Brake pressure spring

14‧‧‧Friction pad

15‧‧‧Friction pad

16‧‧‧Reaction board

17‧‧‧ Friction pad

18‧‧‧ Friction pad

19‧‧‧ Stud

19a‧‧‧Lock nut

20‧‧‧ disc brake assembly

22‧‧‧ Shell

24‧‧‧ Inner periphery

26‧‧‧Circular cavity

28‧‧‧ Fluid pressure import

30‧‧‧Circular fluid pressure chamber

31‧‧‧Circular Piston

32‧‧‧Seal ring

34‧‧‧ inner seal ring

36‧‧‧ radially outwardly extending lugs

38‧‧‧ pores

40‧‧‧Reaction board

41‧‧‧Circularly spaced mounting holes

42‧‧‧Tubular spacers

44‧‧‧ Stud

46‧‧‧Threaded lock nut

48‧‧‧Axial floating annular reaction plate

50‧‧‧ pores

52‧‧‧Rotor disc

54‧‧‧Rotor disc

56‧‧‧Circular friction surface

58‧‧‧Circular friction surface

60‧‧‧ ring friction surface

62‧‧‧Circular friction surface

64‧‧‧ hub

66‧‧‧ hub

68‧‧‧Power Transmission Shaft

70‧‧‧Architecture section

72‧‧‧ screws

73‧‧‧Ring friction pad/segment pad

76‧‧‧Ring friction pad/segment pad

78‧‧‧ Screw

80‧‧‧ Positioning board

82‧‧‧Circular spacers

84‧‧‧ bolt

86‧‧‧ pores

88‧‧‧Circumferentially spaced pores

90‧‧‧ pores

92‧‧‧ bracket

94‧‧‧ holding flange

96‧‧‧ holding flange

98‧‧‧Single pad

100‧‧‧Brake preload spring

192‧‧‧ bracket

196‧‧‧ radially outwardly extending flange

197‧‧‧ Subject

198‧‧‧ lower surface

199‧‧‧ countersink

200‧‧‧ countersink

292‧‧‧ bracket

296‧‧‧Flange

297‧‧‧ Subject

298‧‧‧ lower surface

299‧‧‧ lower end

392‧‧‧ bracket

396‧‧‧Outwardly extending flange

397‧‧‧ Subject

398‧‧‧ lower surface

399‧‧‧ lower end

400‧‧‧ cavity / countersink

492‧‧‧ bracket

496‧‧‧Outwardly extending flange

497‧‧‧ Subject

498‧‧‧ lower surface

499‧‧‧ lower surface

500‧‧‧ countersink/cavity

Figure 1 is a perspective view of one of the disc brake assemblies of the present invention; Figure 2 is a cross-sectional view taken along line 2-2 of Figure 1; Figure 3 is taken along line 3-3 of Figure 2 a cross-sectional view showing a positioning plate in plan view; FIG. 4 is an enlarged view of one of the portions of FIG. 2 showing a brake pad on the bracket that is engaged with an adjacent rotor; FIG. 5 is a view similar to FIG. It shows a brake pad on a carrier that is detached from the adjacent rotor; Figure 6 is a section similar to one of the cross-sectional views of Figure 2, showing a prior art dish Brake assembly; Figure 7 is a view similar to Figure 2, wherein a cross-sectional view is taken from the cross-sectional view of Figure 6 of a prior art disc brake assembly; Figures 8a and 8b are brackets of the present invention, respectively. A top view and a front view of another version; FIG. 9a and FIG. 9b are respectively a top view and a front view of another version of the bracket of the present creation; FIG. 10a and FIG. 10b are respectively another bracket of the present creation. A top view and a front view of one version; and FIGS. 11a and 11b are respectively a top view and a front view of another version of the bracket of the present invention.

Referring to Figures 1 through 5, a disc brake assembly according to the present invention is generally indicated at 20 and includes a housing 22 having a generally annular configuration in which the inner periphery 24 is sized to allow a desired diameter. One of the rotating shafts passes through it with a desired gap. The outer casing 22 includes an annular cavity 26 that cooperates with one of the annular pistons 31 to define an annular fluid pressure chamber 30. The chamber 30 has a plurality of fluid pressure inlets 28 formed through the outer casing 22. The piston 31 is sealed in the annular chamber 26 by a suitable seal ring 32 about its radially outer periphery; and the radially inner periphery of the chamber 26 is sealed by an inner seal ring 34 around the piston 22.

The annular piston 31 has a plurality of circumferentially spaced apart radially outwardly extending lugs 36 in a peripherally spaced configuration, each of which has an aperture 38 formed axially therethrough.

One of the annular fixed mounts acting as a reaction plate 40 is disposed axially spaced from the piston 31 and spaced therefrom by the tubular spacer 42 and secured to the piston by a stud 44 passing through one of the spacers 42, one end of which Attached to the plate 40 and the piston is secured over the stud by a threaded lock nut 46. The mounting plate 40 has a plurality of circumferentially spaced mounting holes 41 disposed adjacent the outer periphery, the holes enabling the mounting plate to a bolted joint that does not exhibit a fixed support structure Pick up.

An axially floating annular reaction plate 48 is disposed between the annular mounting plate 40 and the piston 31; and the plate 48 has an aperture 50 formed therein in a circumferentially spaced configuration to coincide with the position of the stud 44 for axial direction thereof Move freely. The plate 48 is fixed without being rotated by the studs 44 that pass through the apertures 50.

The axial floating reaction plate 48 is disposed between a pair of rotor disks 52, 54 which each have an annular friction surface on their axially opposite sides, 56, 58, 60, 62, respectively. Each of the rotors 52, 54 has a hub (64, 66, respectively) with internal splined connections for driving a connection to a power transmission shaft 68; and the discs 52, 54 are free to axially on the spline shaft 68. mobile.

The annular mounting plate 40 has an annular friction pad or alternatively a plurality of arcuate pad segments (as noted by reference numeral 70) disposed thereon in an annular array that are positioned to contact the annular friction on the rotor 52. Surface 56; and pad 70 are secured to mounting plate 40 by suitable fasteners, such as screws 72. The axial floating reaction plate 48 is fixed on one of its axial faces with an annular friction pad or segmented pad 73 for contacting the friction surface 58 of the rotor disk 52. Mounted on the opposite side of the axial floating reaction plate 48 is another annular friction pad or segmented pad 76 that is secured to the plate 48 by suitable fasteners, such as screws 78. The pad 76 is thus positioned for frictional contact with the friction surface 60 and the rotor disc 54.

A locating plate 80 is axially disposed between the rotor disc 54 and the piston 31 and secured therein by a plurality of circumferentially spaced spacers 82. The plate 80 is secured by bolts 84 that pass through apertures 86 provided in the outer casing 22; and the bolts pass through each of the spacers 82 and are threadedly engaged in the positioning plate 80. The locating plate 80 has a plurality of circumferentially spaced apertures 88 that are disposed in a circumferentially spaced configuration and are positioned to coincide with each of the spacers 42 that are free to move axially within the apertures 88.

Referring to Figures 2 through 5, the locating plate 80 has an array of additional apertures disposed radially inward from the apertures 90 and disposed in a circumferentially spaced configuration as indicated by reference numeral 90. hole Each of the slots 90 has a bracket 92 disposed therein that extends axially through the plate 80 in the aperture 88 and each bracket has a retaining flange (94, 96, respectively) that is on the opposite side of the plate 80 The upper side is provided on the end of the bracket. The flange 94 is disposed adjacent to the rotor disc 54 and has attached a friction surface on one of its axial faces, which in the version shown in Figures 4 and 5 is in the form of a separate pad 98 that is positioned Used for frictional contact with the annular axial face 62 of the rotor disc 54.

Referring to Figure 5, the locating plate is shown moving a sufficient amount to the right to cause the flange 96 on the bracket 92 to align against the rightward side of the plate 80, thus limiting further movement of the cradle in the brake pad 98. Further movement of the outer casing 22 and the locating plate 80 to the right causes the carriage to remove its friction surfaces from the disc surface 62 to the position shown in Figure 5 and release all of the braking torque on the rotor disc.

Referring to Figures 8a and 8b, another version of the bracket is generally indicated at 192 and has a body 197 having a radially outwardly extending flange 196 having a lower surface (indicated at 198) adapted to abut the positioning plate 80. The surface is aligned. The bracket 192 has a central cavity in the form of a counterbore 199 adapted to receive one of the ends of one of the brake preload springs 100 therein. The bracket 192 has an end face 100 of its body 197 that is formed to be integrated into one of the friction surfaces of the body of the bracket. In this practice, the bracket will be formed into a single piece from a composite of metal and ceramic (cermet) or organic friction material.

Referring to Figures 9a and 9b, another version of the inventive bracket is generally indicated at 292 and has a flange 296 having a rectangular configuration as the body 297 of the bracket 292. The lower surface of the flange 296 (labeled 298) is adapted to contact the surface of the positioning plate 80. The lower end surface 299 of the bracket body 297 is configured as a friction surface 299 and is integrally formed with the bracket body 297 and the flange 296 as one piece. The bracket 292 has a central cavity in the form of a countersunk hole 200 in which the receiving bracket brakes the end of one of the preload springs 100. In this practice, the bracket 292 will be formed from a cermet material that provides the desired properties to the friction surface 299.

Referring to Figures 10a and 10b, another version of the inventive bracket is generally indicated at 392 and has an outwardly extending flange 396 having a trapezoidal set of bodies 397 such as bracket 392. state. The flange 396 has a lower surface 398 that is adapted to contact the surface of the positioning plate 80. The bracket body 397 has a lower end surface (labeled 399) that is formed to be integrated with the bracket body 397 as one of a piece of friction surface. The bracket 392 has a cavity or counterbore 400 provided therein for receiving one of the ends of one of the brake preload springs 100 therein. In the present practice, the bracket 392 is integrally formed as a piece of cermet material that provides suitable properties for the friction surface 399.

Referring to Figures 11a and 11b, another version of the inventive bracket is generally indicated at 492 and has an outwardly extending flange 496 having a trapezoidal configuration as one of the bodies 497. The flange 496 has a lower surface 498 that is configured to contact the face of the positioning plate 80 to limit movement of the carrier. The lower end face of the bracket 492 (labeled 499) is configured as a friction surface; and the surface 499 is integrated with the body of the bracket 497 and the flange 496 to form one piece. Bracket 492 has a plurality of countersinks or cavities, designated 500 therein, each for receiving a single individual free-load spring 100 that urges the carriage friction surface 499 into contact with surface 62 of rotor disc 54. In this practice, the bracket 492 will be integrated into a piece of cermet material.

In operation, the brake spring 100 advances the bracket 92 axially to the left in FIG. 4 until the brake pad 98 contacts the surface 62 of the rotor disc 54. The rotor disc 54 is then moved axially on the shaft 68, causing the annular friction surface 60 on the rotor 54 to contact the friction pad 76 on the axial floating reaction plate 48. The reaction plate 48 is thus advanced to the left to cause the brake friction pad 73 thereon to contact the annular friction surface 58 on the rotor 52, which in turn causes the rotor to move axially, causing the friction surface thereon to contact the brake pad 70 on the mounting plate 40. Therefore, the brake lock torque is provided on the rotor disc to suppress the rotation thereof.

The disc brake of the present invention thus provides a plurality of individual spring biased brackets in a locating plate, each having a brake friction surface or pad to provide uniform braking pressure on the cradle under the advancement of a preloaded spring to The uniform braking torque is provided on the rotor disc and thus the desired initial stopping torque independent of the pressure or the undesired axial deflection of the positioning plate is achieved.

Obviously, others will think of modifications and changes when reading and understanding the previous detailed description. more. The exemplified versions described herein are intended to be inclusive of all such modifications and variations, which are within the scope of the appended claims and their equivalents.

20‧‧‧ disc brake assembly

22‧‧‧ Shell

24‧‧‧ Inner periphery

28‧‧‧ Fluid pressure import

36‧‧‧ radially outwardly extending lugs

41‧‧‧Circularly spaced mounting holes

44‧‧‧ Stud

84‧‧‧ bolt

Claims (7)

A disc brake assembly comprising: (a) an outer casing defining an annular fluid pressure chamber including an inlet adapted to be coupled to a source of pressurized fluid; and (b) an annular piston having the same Sealing a portion disposed in the fluid pressure chamber; (c) an annular positioning plate secured to the outer casing and having a plurality of brackets, each having a surrounding disposed thereon and being individually axially relative to the plate Moving one of the friction surfaces; (d) a plurality of springs disposed about the piston and operable to bias the brackets in an axial direction away from one of the pistons; (e) at least one rotor having a An annular friction surface on an input shaft for sliding therewith and movable thereon in an axial direction; and (f) an annular mounting plate having an annular friction surface coupled to the piston, wherein After the fluid of the pressure chamber is pressurized, the outer casing and the positioning plate move axially away from the rotor, the friction pad and the mounting plate, and after the pressure chamber is decompressed, the springs can be operated to move the friction pads To the annular friction surface of the at least one rotor For implementing the braking force. The assembly of claim 1 wherein each of the brackets is attached to a member that is received through one of the apertures in the locating plate. The assembly of claim 1 further comprising a plurality of rotors, wherein the adjacent rotors are separated by an annular reaction plate axially movable relative to the rotors, the reaction plates having the annular friction surfaces disposed adjacent the rotors thereon Friction material. The assembly of claim 1 wherein the brackets are individually spring biased in an axial direction toward one of the rotor annular friction surfaces. The assembly of claim 1, wherein the at least one rotor spline is coupled to the input shaft. The assembly of claim 1, wherein each of the brackets has a plurality of springs that bias the bracket in a direction to contact the adjacent rotor disk. The assembly of claim 1, wherein each of the brackets has one of the cavities in which one end of the spring is received.