TWM513942U - Expander brake and clutch assembly - Google Patents

Abstract

A pneumatic expander brake/clutch having a first power transmission member as a drum with an annular friction surface on the outer periphery. Arcuate backing block segments are circumferentially closely spaced and adjacent about the drum friction surface. The backing blocks have brake friction pads on the radially inner surface. An inflatable expander ring surrounds the backing blocks and upon inflation forces the blocks radially inward and the pads against the drum friction surface. Baffles are provided on the end of the backing blocks and extend into the spaces between circumferentially adjacent blocks to form a tortuous path for heat emanating from the drum friction surface in a radially outer direction. The baffles insulate the inflatable expander from heat which permits the drum friction surface to operate at a higher temperature, and power transmission/dissipation without overheating the expander.

Description

Extended brake and clutch assembly

The present invention relates to pneumatically extended brake and clutch devices for braking or clutching power transmissions on rotating components and machines, such as cable drums and marine propeller shafts, where braking or engagement between shafts or a shaft or disk is required Power transmission between fixed components. These devices are typically used to drive or dissipate a large amount of shaft power, for example, capable of handling 300,000 Newton meters (Nm) and up to 77 inches (193 cm) for applications such as, for example, grinders, marine propulsion, metal forming machines, and oilfield machines. The torque brake or clutch of the diameter. Such relatively large pneumatic brakes and clutches may employ a drum having a peripheral frictional engagement surface on which the friction pads on the array of circumferentially disposed backing blocks are pressed against the peripheral frictional engagement surface, which surrounds the arcuate back One of the arrays of pads can be pressed against the friction material or friction pad against which the drum friction surface presses under the force of the inflatable annular ring or extension.

In operation, such relatively large brakes and clutches generate heat on the drum friction surface during braking and clutching; and heat radiates outwardly in the space between the arcuate backing blocks disposed about the drum. To date, in conjunction with the operation of such large brakes and clutches, it has been found that when the temperature on the friction surface of the drum reaches approximately 600 °F (315 °C), the temperature of the inflatable surrounding the bow can exceed The 250 °F (121 °C) operating limit temperature of the material used in the inflatable ring (usually rubber). This temperature limitation of the inflatable ring thus limits the allowable temperature rise on the friction surface of the drum and thus the amount of power that is transmitted or dissipated by the brake and clutch assembly.

Therefore, there is a need to provide a means or means for increasing a pneumatically operated brake and away The allowable surface temperature of the friction surface on the drum of the combiner assembly to increase the amount of power or torque transmitted or dissipated by the brake and clutch assembly for a particular size drum friction surface without overheating the extended ring.

The present description describes and depicts an annular friction surface on a rotating power transmission member and is disposed around the circumference of the annular friction surface and has a friction material or brake pad thereon (a ring is disposed around the circumference of the adjacent and adjacent arcuate backing block) A pneumatically-expanded brake and clutch of the type of annular array of one of the arcuate blocks of the inflatable material or brake pad against the annular friction surface of the first power transmission member. The space between adjacent arcuate backing blocks has a baffle extending therein in a circumferentially overlapping or staggered configuration. The baffle inhibits radiant heat from radiating radially outward from the radiant heat on the friction surface of the first power transmission member and radiating or heating the inflatable rubber expansion ring above its normal limit operating temperature. The baffles enable the operating temperature of the annular friction surface on the first power transmission member to be significantly increased for an existing brake and clutch configuration and thus substantially increase the power transmission and dissipation capabilities of an existing brake and clutch assembly. The size of the annular friction surface and the size of the first power transmission member are not increased.

In one version, the baffle is integrated to extend from the end of the brake pad backing block; and in another version, the baffle is attached to a separate component of the existing brake pad backing block by fasteners.

10‧‧‧Pneumatically operated extended brakes

12‧‧‧ spaced ring piece / fixed piece / piece

14‧‧‧ spaced ring piece / fixed piece / piece

16‧‧‧ Peripheral flange annular channel member/channel

18‧‧‧ bolt

20‧‧‧ brake drum

22‧‧‧Axis

24‧‧‧Outer ring friction surface

26‧‧‧Rock flange

28‧‧‧net

30‧‧‧ Bow Element

30'‧‧‧ Bow Element

32‧‧‧Bow brake backing block

32'‧‧‧ Bow Brake Back Pad

32"‧‧‧bow brake block

34‧‧‧Friction pad

36‧‧‧ outer gap

36'‧‧‧ outer gap

36"‧‧‧ gap

37‧‧‧fasteners

38‧‧‧Center gap

38'‧‧‧Center gap

40‧‧‧ Torque rod

42‧‧‧ lugs

44‧‧‧ lugs

46‧‧‧ pores

47‧‧‧ Spring

48‧‧‧ pores

50‧‧‧Baffle members

50'‧‧‧Baffle member

52‧‧‧Baffle members

52'‧‧‧Baffle members

54‧‧‧Circular inflatable body extension

55‧‧‧Layered rubber material

56‧‧‧ cord material layer

58‧‧‧Pneumatic imported parts

60‧‧‧Baffle members

62‧‧‧Flange

64‧‧‧ screws

100‧‧‧Pneumatic extended brakes and clutches

102‧‧‧First power transmission components

104‧‧‧Input shaft

106‧‧‧ hub

108‧‧‧ keyway

110‧‧‧ gas supply accessories

112‧‧‧Central passage

114‧‧‧ Radial

116‧‧‧ Radial 埠

119‧‧‧ channel

120‧‧‧Accessories

122‧‧‧Outer ring drive ring

124‧‧‧ bolt

126‧‧‧Outer annular flange

128‧‧‧Fluid fittings

130‧‧‧ tube

132‧‧‧Circular channel members

134‧‧‧ annular axial spacer flange

136‧‧‧ annular axial spacer flange

138‧‧‧ annular ring

140‧‧‧ annular ring

142‧‧‧ bolt

144‧‧‧Ring inflatable body extension

146‧‧‧Bow-shaped annular backing element

148‧‧‧Friction pad

150‧‧‧Second power transmission components

152‧‧‧Axis

154‧‧ ‧ hub

156‧‧‧ keyway

158‧‧" ring drum

160‧‧‧ annular flange

162‧‧‧Circular spacer bolts

164‧‧‧Circular friction surface

Figure 1 is a front elevational view of a pneumatically extended brake assembly having one type of annular friction surface disposed about the periphery of a rotating drum; Figure 2 is a version of the left side view (partial section) of Figure 1; Figure 3 is a diagram A perspective view of a version of 1 in which portions are cut away to show internal components; Figure 4 is a version of the brake block, friction pad, torque rod and pad reset bomb shown in Figure 3. A perspective view of one of the spring assemblies; Figure 5 is a perspective view of another version of the arcuate brake backing block, which integrates one of its ends to form a baffle for use in the configuration of Figure 3; Figure 6 is a diagram A partial perspective view of one of the alternative versions of the arcuate brake backing block of 5, having a baffle attached thereto by fasteners; and Figure 7 is used as one of the original versions of a pneumatically extended clutch assembly A section view.

Referring to Figures 1 through 4, one version of a pneumatically operated extended brake is generally indicated at 10 and includes a first sub-type of a first power transmission element that is secured to a periphery by a suitable fastener such as bolt 18. One of the forms of the flange annular channel member 16 is spaced apart from the annular sheets 12, 14, wherein the axial width of the passage 16 provides the desired spacing of the stators 12, 14. One of the overall indications is that one of the brake drums is disposed between the sheets 12 and 14 and is disposed concentrically with one of the second power transmission members in the form of a shaft 22, wherein the drum has an outer annular friction surface 24 that includes The web 28 attached to the shaft 22 supports a periphery for rotating one of the rim flanges 26 relative to the stators 12, 14.

A plurality of arcuate elements, generally indicated 30, 30', are disposed in a circumferentially spaced annular array surrounding the friction surface 24 and are disposed on a first power transmission member by attachment to the stators 12, 14 as will be described below. .

Referring to Figures 3 and 4, each of the arcuate members 30 includes an arcuate brake backing block 32 having a friction material attached thereto that is one of the appropriate materials for frictionally contacting the annular friction surface 24 34 form. In the present practice, the friction pad 34 is attached to the arcuate brake backing block 32 by a suitable fastener 37, such as, for example, a rivet.

The arcuate brake backing block 32 is illustrated in FIG. 4 as a plurality of three circumferentially spaced voids or passages extending axially therethrough, wherein the central void is disposed at a point in the arcuate brake backing block 32 and is referenced by reference The numeral 38 is labeled; and the outer gap is indicated by reference numeral 36.

Referring to Figure 5, another version of the arcuate brake backing block has been designated by reference numeral 32' as having five axial voids including a central void 38' and four outer voids 36'. The bow brake backing block 32 shown in Figure 4 has a central axial passage or void 38, wherein each axial passage is on each of the opposite circumferential sides as indicated by reference numeral 36. Any one of the bow brake backing blocks 32, 32' can be disposed between the annular stators 12, 14, and the selected block is secured therein by a torque rod 40 having opposite ends formed therein The upper lugs (or pins) 42, 44 engage the apertures 46, 48 provided on the stators 12, 14, respectively. The width of the torque rod 40 is selected to allow the arcuate brake backing blocks 32, 32' to closely engage the brake back pad center voids 38, 38' in a manner that slides in a radial direction relative to the annular friction surface 24. On the side. However, it should be understood that the width of the torque rod 40 is sized to inhibit any movement of the associated bow brake backing blocks 32, 32' in a circumferential direction. One of the reed forms, return spring 47, is provided for either of the arcuate brake backing blocks 32, 32' for advancing the block in a radially outward direction. The spring 47 is shown in one form that has been found to be satisfactory in this practice, including a bow spring with the torque rod 40 aligned against its end and the central region of the bow spring against the respective central void 38, 38' The surface is aligned.

Either version of the bow brake backing block 32, 32' has provided at least one baffle member on its opposite circumferential ends, designated 50, 52 and 50', 52', respectively, extending in a circumferential direction It is substantially equal to one of the widths in the circumferential direction of the space formed between the arcuate members 30. In the present practice, it has been found to be satisfactory to position the baffle members 50, 52 and 50', 52' on the arcuate members 30, 30' in a radial direction such that the arcuate brake pads are adjacent from the circumference. The baffle members extending from the pads 32, 32' extend into the space between the arcuate elements 30 at different radial positions, respectively. This configuration provides a winding path for any radiant energy (such as thermal energy) radiated from the annular friction surface 24 of the first power transmission member or drum that is substantially blocked from flowing radially outwardly and substantially blocked and surrounded by the arcuate The annular inflatable body extension (generally indicated as 54) is placed in contact with the component 30.

In the present practice, the annular inflatable body expander 54 may be formed of a layered rubber material 55 with a layer of cord material as indicated by reference numeral 56 in FIG. The annular inflatable body expander 54 has a pneumatic inlet fitting 58 that is coupled through the stator 14 and is adapted to urge the brake block to contact the annular friction surface 24 on the first power transmission member with the pad 34 for achieving When it is braked, it is externally connected thereto for supplying air pressure to the annular inflatable body expander 54.

Referring to Figures 4 and 5, in the present practice, the arcuate brake backing blocks 32, 32' are integrally formed as one piece with their respective baffle members 50, 52 and 50', 52'. In the present practice, it has been found to be satisfactory to form a piece of bow brake backing block 32, 32' of aluminum material and, in particular, 6061 aluminum alloy has been found to be satisfactory; however, it should be understood that other suitable materials It can be used as an alloy such as nickel and steel. In this practice, aluminum has been chosen for ease of manufacture, weight reduction, and cost reduction.

It should be understood that although only one baffle member has been shown in the arcuate brake backing block 32, 32', a plurality of baffle members 50, 52 and 50', 52' may be employed, provided that they are spaced apart for staggered configuration. .

Referring to Figure 6, an alternative version of the baffle member is generally indicated at 60 and has a right angle configuration in a transverse cross-section with a flange 62 provided along it for attachment to the bow brake by a suitable fastener such as screw 64. One end of block 32", one of which is shown in Figure 6 as having a void 36" therethrough.

Referring to FIG. 7, one version of the present pneumatic extended brake and clutch is illustrated as a one-rotation clutch generally indicated at 100, having a first power transmission element generally indicated at 102, including rotatably via a keyway 108 One of the hubs 106 is driven to input shaft 104. The shaft 104 has a gas supply fitting 110 rotatably coupled to its end for supplying air through a central passage 112 indicated as a dashed line in Fig. 7 to a plurality of radial turns formed in the shaft 104 and shown as dashed lines. 114, 116, which supply air through the passage 119 in the hub 106 to one of the fittings 120 provided on the hub 106. An outer annular drive ring 122 is spaced around its circumference A bolt 124 is coupled to the hub 106. The ring 122 has an outer annular flange 126 through which a fluid fitting 128 is received that is coupled to the fitting 120 via a tube 130. An annular passage member 132 has a pair of annular axially spaced flanges 134, 136 that are coupled to the annular rings 138, 140 by suitable fasteners, such as bolts 142.

An annular inflatable body extender 144 is disposed on the inner periphery of the annular passage member 132 and has disposed a plurality of arcuate annular backing members 146 in a circumferentially spaced configuration about its inner periphery, each of which has been attached to a friction Pad 148.

One of the overall indications is 150. The second power transmission element has a shaft 152 that is drivably coupled to a hub 154 by a keyway 156. An annular flange 160 has been attached to the hub 154 and is secured to the hub by a plurality of circumferential spacer bolts 162. The flange 160 is coupled to an annular drum 158. The outer periphery of the drum 158 has an annular friction surface 164 formed thereon that engages the frictional contact 148 in the frictional contact for engaging and coupling the shaft 152 to effect rotation of the shaft 104 as the annular inflatable body expander 144 is inflated. . It will be appreciated that the arcuate annular backing member 146 is secured by the torque rod in a manner such as a pneumatically operated extended brake 10; and has a manner similar to one of the baffles in each of the arcuate annular backing members 146. One of the baffle members 50, 52 extends at the circumferential end.

The present invention thus describes a pneumatically extended brake and clutch having a bow-shaped backing element or brake block having a friction material or brake pad thereon, which is placed on a first power transmission element and placed Arranged for circumferential spacing and surrounded by an annular inflatable body adapted to be coupled to a source of pressurized fluid. As the inflatable body is inflated, the arcuate member is advanced radially inwardly causing the brake pad to frictionally engage the annular friction surface of a second power transmission component. Each of the brake blocks has a baffle member extending from its opposite circumferential end to a space between adjacent arcuate elements. The baffle thus forms a winding path and inhibits radiation radiating radially outward from the annular friction surface of the second power transmission element from directly contacting the surface of the inflatable body to inhibit heating thereof. The baffle thus enables the annular friction surface of the second power transmission element to experience substantially higher temperatures during operation without frictional ringing during frictional engagement The temperature of the inflator. Thus, by replacing the arcuate backing member of an existing brake and clutch design without changing its dimensions, the brake and clutch assembly of the present invention can be driven or absorbed by a substantially greater amount of torque.

In this practice, it has been found that when the surface temperature of the annular friction surface on one of the existing brake and clutch power transmission components reaches 600 °F (315 ° C), the temperature of the inflatable body exceeds 250 ° F (131 ° C) and Overheating, and thus damage to the inflatable body occurs. However, when a baffle member is employed on an arcuate backing member of an existing brake and clutch according to the present invention, the temperature of the annular friction surface can be allowed to reach 1200 °F (648 °C), and the temperature of the inflatable body does not exceed 250 °F. (131 ° C). The result is a pneumatically extended brake and clutch assembly having a power transmission component of a given size that is capable of generating and absorbing more than 40% of the power and torque when the arcuate member having the disclosed baffle member is inserted.

Obviously, modifications and alterations will occur to others upon reading and understanding the foregoing detailed description. The exemplified version of the present invention is to be construed as being limited to the scope of the appended claims and their equivalents.

10‧‧‧Pneumatically operated extended brakes

14‧‧‧ ring piece

18‧‧‧ bolt

20‧‧‧ brake drum

22‧‧‧Axis

24‧‧‧Outer ring friction surface

26‧‧‧Rock flange

28‧‧‧net

30‧‧‧ Bow Element

44‧‧‧ lugs

58‧‧‧Pneumatic imported parts

Claims (9)

A pneumatic extended brake and clutch assembly comprising: a first power transmission component; a second power transmission component disposed to rotate relative to the first power transmission component and including an annular friction surface; a plurality of bows An annular array of elements disposed on the first power transmission element circumferentially spaced about the annular friction surface and radially movable relative to the annular friction surface, wherein each arcuate member includes a friction pad and shaft a plurality of voids extending therethrough; an annular inflatable body extender disposed about the arcuate members on the first power transmission member and operable to radially move the arcuate members when inflated, Used to achieve relative rotational contact of the friction pads with the annular friction surface of the second power transmission component for effecting power transmission between the first power transmission component and the second power transmission component; a torque rod, Connected to the first power transmission element and extending through one of the plurality of voids in each of the arcuate elements, and operable Allowing the respective arcuate members to move only in the radial direction; and a baffle member extending in a circumferential direction from opposite ends of each of the arcuate members to a space between adjacent arcuate members, wherein adjacent arcuate members The baffle members define a winding path for the radiant energy radiated from the annular friction surface to the inflatable body in the space therebetween. The assembly of claim 1, wherein each of the at least one baffle member is integrally formed as one piece with the respective arcuate member. The assembly of claim 2, wherein the arcuate elements are formed from aluminum. The assembly of claim 2, wherein the arcuate elements are formed from 6061 aluminum. The assembly of claim 1, wherein the arcuate members are formed of aluminum, and the baffle member is formed of galvanized steel. The assembly of claim 1 wherein each of the arcuate members comprises a plurality of baffle members and the baffle members extending into the space between adjacent arcuate members are staggered. The assembly of claim 1, wherein the first power transmission component comprises a pair of axially spaced annular segments, wherein opposite ends of the respective torque bars are respectively coupled to one of the pair. The assembly of claim 1 wherein the friction pads are secured to the respective arcuate members by fasteners. The assembly of claim 1, wherein the second power transmission element comprises a drum having the annular friction surface disposed about a periphery thereof.