JPH06501537A - Multi-area brake actuation piston mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Double injection brake gear actuating piston mechanism FIELD OF THE INVENTION This invention relates generally to hydraulic brake actuating piston mechanisms, and more particularly to aircraft brake actuation piston mechanisms. The present invention relates to a multi-area brake actuation piston mechanism for a brake assembly.

Aircraft disc brake assemblies traditionally consist of multiple pins in a balanced array around a circle. The stone mechanism has a completely circular shape, and the pressure plate can be moved to remove the fixed disc. The disc brake stack is configured to alternately engage the base and rotating disc elements with the disc brake stack. It works like a sea urchin. Prior art actuating piston mechanisms have traditionally A single piston is employed which provides a linear relationship between rake device pressure. fixed de disc element and rotating disc element for higher and lower braking pressure The force changes the way they engage with each other, and this change results in a higher coefficient of friction at lower pressures. Brake Grappi at lower pressures to create more "grasosine" problems brakes that provide higher desired braking force at higher pressures. - It is desirable to provide ten actuating piston machine grooves. Such a piston a structure also has Braking caused by high and low braking pressure, typically achieved by a single-area piston. - Reduce the difference in torque.

The present invention includes a "first bore" and a second bore disposed within the "second" bore coaxially with the first bore. a housing disposed within the first bore and extending from the bore to the piston end; a first piston mechanism; a second piston disposed within the second bore and extending to the end of the piston; a housing that allows fluid communication between the first bore and the second bore, respectively; a bore opening and a second bore opening, the second bore opening configured to allow fluid flow to the second bore; and valve means for controlling the pressure of the first and second bore openings. ” the piston moves the piston end and the increased fluid pressure causes the second piston to Therefore, move it toward the piston end, and join the piston ends to both pistons. Thus, the above problems can be solved by providing a multi-area brake actuation piston that moves give a solution for.

One method of carrying out the invention will now be described in detail with reference to the accompanying drawings, which illustrate examples of the invention. .

FIG. 1 is a schematic cross-sectional view of an actuating piston mechanism embodying the invention.

FIG. 2 is a schematic cross-sectional view of a modified valve device that can be used in the present invention.

FIG. 3A is a graph showing a typical relationship between input pressure (P-Pa) and time. Ru.

Figure 3B shows the relationship between piston effective area and time according to the pressure history shown in Figure 38. This is a graph showing.

Figure 4 shows U;! The presence of a piston for the actuating piston mechanism that utilizes the valve mechanism of J2 It is a graph showing the relationship between effective area and pressure input.

FIG. 5 shows a modified embodiment of the invention.

A multi-area brake actuating piston mechanism is shown in FIG. 1 generally designated by the reference numeral IO. Ru. Either the piston housing 12 or the forward piston housing by means of a threaded connection 18. The rear piston housing 14 has a rear piston housing 14 screwed together with a ring 16. rear piston housing The inner ring, together with the front piston housing 16, includes a fluid pressure receiver having a flow passage 22. constitutes a manifold chamber 20. The chamber 20 is sealed by a sealing mechanism 24. It will be sealed. The front piston housing 16 is connected to the second piston bore 40. Instead, a first piston bore 30 arranged coaxially is grown. Each bore 30.40 is A first piston 50 extends from a second bore, and a second piston 60 extends from a second bore. It has an open end so that it can be opened. The first bore 30 communicates with the chamber 20. It has a first hoa opening 32 . First piston 50 receives a sealing device 56 each sealing device has a first bobbin end 52 with an opposing groove 54; radially opposed wall surfaces 57 and 59 of A. The first piston 50 is axially The piston extends in the direction and abuts the end 70 of the piston. The piston 50 and the piston end 70 are : A wire connected by the nog 72 and provided in the groove 19 of the first housing I6. Par +7 or engages piston 50. The second piston 60 has an inner piston end 6 2, the end of which receives a sealing mechanism 66 that engages a surface of the second bore 40. It is equipped with 1R64. The second piston 60 extends in the axial direction and includes a portion of the end bumper. The piston end 70 is made of a material 65 (preferably made of metal, elastic or flexible material). wiper 21 engaged with the wiper 21 and installed in the groove 23 of the first housing end 16 or the second Engages with screw 1->60. The piston end 70 is inside the second piston 60. Extends and engages with the second screw I (7, axial extension connected to the second screw I) It has a section 74.

Similarly, the screw end 70 has a short shaft that engages the axially outer surface of the second piston 60. It has a directional extension 76 . The second bore 40 has a bore opening 4 communicating with the chamber 20. It has 2. Within bore opening 42 is a valve arrangement or mechanism 80 . The valve device 80 is It has a valve member 82 having a flow restriction orifice 84, and the valve member 82 has a resilient means 8. 6 and engages with the valve seat 88. The valve device 80 starts from the channel 20. Restricting fluid flow to the second pore 40 through the second bore opening 42 and blocking the valve member 82. The rake is released at a predetermined pressure difference when released from Nakaiza 88, and when the pressure difference is exceeded, the rake is released in the opposite direction. Increase fluid flow.

An adjuster mechanism, designated generally by the reference numeral 90, is located within the first bore 30. It is better to The adjuster mechanism 90 extends from the radial abutting portion of the first housing I6. It consists of an engageable member 92 and an engaging member 94. Flange member 9 of mechanism 90 6 is in contact with a ring 97 attached to the first piston 50 and is in contact with a flange 96. engageable via elastic means 98 extending between the radial layer 58 of the first piston material 92 .

When fluid pressure is communicated through opening 22 into chamber 20, the fluid pressure The pressure is freely transmitted through the bore opening 32 to the first bore 30 and the pressure is applied to the first piston 50. is biased outwardly so that the piston end 70 is biased toward the associated brake pressure plate (not shown). ). Fluid pressure received in chamber 20 is also communicated to valve arrangement 80. It will be done. However, fluid does not flow through the restriction orifice 84 into the second bore 40. Therefore, at a lower brake actuation pressure, the second piston 60 is not effectively actuated by fluid pressure received within chamber 20. 2nd piston The tongue 60 initially does not move outwardly with the piston end 70. Axial extension 74 moves relative to the second piston 60, and therefore the bumper one end member 65 and the piston A gap is created between the ends of 60. However, increased i.e. higher fluid pressure is received into chamber 20 through opening 22, the higher fluid pressure is effective to actuate the second piston 60 and pull the movement of the piston 60. The end of the piston 20 re-engages the bumper member 65. Than High fluid pressure passes through orifice 84 and acts on second piston 60 .

The actuating piston mechanism 10 is activated at low brake pressure (when brake effectiveness is high). 1 Piston area defined by internal piston end 52 installed in bore 30 Perform the operation of the first screw)>50 via AI. Brake effectiveness force/representative n (At higher fluid pressures when not too high, the second piston 60 is in the area A2 (= It is actuated by the acting fluid pressure, and the effective area of the piston is AI and A2. , move the biston end 70 (relative to the brake pressure plate, not shown). The piston mechanism 0 uses a smaller piston area Al, so it has a lower λ Reduces the brake grabiness due to the high pressure λ friction coefficient and increases the brake grip strength. The desired height resulting from the combination of piston area A1 and 82 with key pressure Provides operating force for the stone mechanism.

FIG. 3B graphically illustrates the relationship between piston effective area and time. Lower the brake once and give it one brake. When the working fluid pressure increases enough to begin to move the first piston, the piston The piston area A1 of the ton 50 is as shown by the first part to the curve (second, pressure Pressure is output by lighting the board. 10, the second piston receives higher brake operating fluid pressure. When stone 60 becomes effective, the pressure output increases according to the part AI + A2C of curve A. make it big FIG. 3A shows the relationship between input pressure and time. Po is the piston mechanism force < (This is the residual pressure inside the piston housing when it is not moving.

FIG. 2 shows two possible valve devices or valve mechanisms used in the actuating piston structure of the present invention. 180 is shown. /'t Pope 2 Toben with Uzing +42 is a bullet. Valve by sexual means +86! Press Nj to +88. I accept this in the middle of the day. Valve device 180 applies low fluid pressure to second pore 40. Maintain a clear message. However, at a given pressure level and above, Fluid pressure (second, move poppet 182 away from valve seat 188 to apply higher pressure) 2 hoa 401 things to tell.

The poppet head 182 has a booth opening 183, and once the poppet head 182 is Once the valve seat 188 is re-engaged at a predetermined f level, this small opening allows fluid to be channeled. Return to server 20.

FIG. 4 shows the valve device 180 of FIG. 2 when used in the actuating piston 1tllllO. , graphically illustrates the relationship between piston effective area and pressure input in chamber l-20. vinegar. After receiving a relatively low fluid pressure, the first piston 50 reaches the piston effective surface fit. Move the part Al of 3-7\ so that it corresponds to the specified pressure output. Ru. Once the valve device 180 opens at a predetermined pressure level, the piston of the second piston 60 The ton effective surface fliA2, in combination with the piston effective area AI, is the part to the curve Outputs the pressure specified by AI+A2. The main difference between valve devices 80 and 180 is Valve gear +80 or give a stepped pressure curve rather than the pressure increase shown in Figure 3B. That's true.

FIG. 5 shows a modified embodiment of the invention. Most similar structures are 1007'l: They are designated by the same reference numerals. In this example, reference number 19 The adjuster mechanism designated 0 is disposed within the second piston 160. piston Housing 112 of mechanism 110 includes a port that is engaged by engageable member +92. tube/tube extension 194. The second piston +60 is an elastic means! to 98 There is therefore a ring 197 which serves as a seat for the H-biased flange 196. elasticity The means 198 is arranged between the flange 196 and the radial direction [167] of the second piston. be done. The second piston +60 sealingly engages the ball/tube extension 194; and a second sealing mechanism 168 that is separate from the sealing mechanism 166 disposed within the groove 164. has. The second piston also has threads that engage threads 172 on the piston end 170. The piston end 170 is movable relative to the second piston 160. do not have.

Second piston pore 140 receives fluid pressure via valve device 80 . mechanism l lO operates similarly to the mechanism of Figure 1, as shown in Figures 38 and 43B. do.

Alternatively, the mechanism 110 may be the valve device or valve mechanism shown in FIG. 2 instead of the valve device 80. 180 may exist.

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Claims (10)

[Claims] (1) a first bore (30, 130); and in the first bore (30, 130), the It has a first bore (30, 130) and a second bore (40, 140) coaxially arranged. a housing (12, 112) disposed within the first bore (30, 130); from the housing (12, 112) and the first bore (30, 130). a first piston (50, 150) extending outwardly to a piston end (70, 170); disposed within said second bore (40, 140) and said piston end (70, 170); a second piston (60, 160) extending outwardly to the bore (30, 130, 40, 140) and the respective housings (140, 140). 2, 112) and the second bore opening (42, 142). ) and a manifold chamber (20) communicating with the second bore opening (42). , 142) includes valve means ( 80, 180) and communicated with the bore opening (32, 132, 42, 142). Fluid pressure causes said first piston (50, 150) to move said piston end (70, 170), and the increased fluid pressure causes the second piston (60, 160) to move. ) towards the piston end (70, 170), and the piston The ends (70, 170) are jointly connected by both pistons (50, 150, 60, 160). A multi-area brake actuating piston mechanism characterized by moving the piston. (2) The valve device (80, 180) supplies fluid to the second bore (40, 140). comprising a directional flow restrictor (80, 180) for controlling the flow; The limiter (80, 180) includes a valve member (82, 182) with an opening (84, 183). ), the valve member (82, 182) being Piston mechanism according to claim 1, pressed against the valve seat (88, 188). (3) The piston end (70) is received inside the second piston (60). 2. A piston mechanism according to claim 1, having a longitudinal extension (74) with a curved longitudinal extension (74). (4) further comprising an adjuster mechanism (90) disposed within the first bore (30); The piston mechanism according to claim 1. (5) The adjuster mechanism (90) has an engageable member (92) and an engageable member ( 94), said engageable member (92) being biased by elastic means (98). and engages the engageable member (94), the engageable member (92) The piston mechanism according to claim 4, wherein the piston mechanism is coupled to the first piston (50). (6) The first piston (50, 150) is located in the first bore (30, 130). Internal piston with radially opposed sealing devices (56) engaging opposing surfaces 2. A piston mechanism according to claim 1, having a piston end (52). (7) further adjusting the adjuster mechanism (190) disposed within the second bore (140); The piston mechanism according to claim 1, having: (8) The adjuster mechanism (190) has an engageable member (192) and an engageable portion. material (194), said engageable member (192) being adapted to elastic means (198). Therefore, it is biased to engage with the engageable member (194), and the engageable member (1 92) is a piston according to claim 7, wherein said second piston (160) is connected to said second piston (160). mechanism. (9) The valve device (80) restricts fluid flow to the second bore (140). - Piston mechanism according to claim 7, comprising a directional flow restrictor (80). (10) The -direction flow restrictor (80) includes a valve member (82) with an opening (84). ), the valve member (82) being pressed against the valve seat (88) by elastic means (86). The piston mechanism according to claim 9, wherein the piston mechanism is basted.