Normally closed pneumatic friction type brake

Abstract

The utility model discloses a normally-closed pneumatic friction type brake, and belongs to the field of brakes. The brake comprises an end cover, an inner fluted disc fixedly installed on the end face of one side of the end cover, an outer gear sleeve movably installed in the end cover, connected with the end cover through inner teeth and outer teeth and capable of axially moving, and a plurality of steel sheets evenly distributed in the inner fluted disc and connected with the inner fluted disc through the inner teeth and the outer teeth. The friction plates are evenly distributed on the outer wall of the outer gear sleeve, connected with the outer gear sleeve through inner teeth and outer teeth and staggered with the steel sheets one by one, the wave springs are arranged between the steel sheets and the friction plates, and the normally-closed driving mechanism is arranged on the side, away from the end cover, of the inner gear disc and the outer gear sleeve and used for driving the steel sheets and the friction plates to move. Compared with a traditional normally-open type structure, the brake adopts a normally-closed type structure, and the working condition needing long-term combination is better met.

Description

Technical Field

[0001] The present application relates to the technical field of brakes, and in particular to a normally closed pneumatic friction brake. Background Art

[0002] The clutch is located in the flywheel housing between the engine and the gearbox. The clutch assembly is fixed to the rear plane of the flywheel with screws. The clutch output shaft is the gearbox input shaft. During the driving process of the car, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and gearbox to cut off or transfer the power input from the engine to the transmission. The clutch is a common component in mechanical transmission, which can separate or engage the transmission system at any time.

[0003] The friction clutch currently used in the industrial transmission field on the market is based on the principle that after the clutch is installed on the equipment, the power shaft is installed in the hollow through-shaft tube, and the coupling plate is fixed on the fixed plate. At this time, the clutch is in a disconnected state, and the active end operates with the hollow through-shaft tube and the driving pressure plate; when air is ventilated from the pressure source inlet, the piston pushes the driving pressure plate to press multiple sets of steel plates and friction plates, and the clutch is in a connected state; when the pressure source is cut off, the separation spring pushes the driving pressure plate to move axially to the right, the clutch is in a disconnected state, and the active end operates again. However, this type of friction clutch is a normally open type, which is difficult to meet the working conditions that require long-term engagement.

[0004] Therefore, the present application provides a normally closed pneumatic friction brake to solve the above problems. Utility Model Content

[0005] The present application provides a normally closed pneumatic friction brake, which aims to solve the problems mentioned in the background technology that the existing friction clutch is normally open and difficult to meet the working conditions requiring long-term engagement.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a normally closed pneumatic friction brake, comprising an end cover, an inner toothed disc fixedly mounted on an end surface of one side of the end cover, an outer toothed sleeve movably mounted in the end cover and connected to the end cover through inner and outer teeth and capable of axial movement, a plurality of steel sheets evenly arranged in the inner toothed disc and connected to the inner toothed disc through inner and outer teeth, a plurality of friction sheets evenly arranged on the outer wall of the outer toothed sleeve and connected to the outer toothed sleeve through inner and outer teeth and staggered with the plurality of steel sheets, a wave spring arranged between the plurality of steel sheets and the friction sheets, and a normally closed drive mechanism arranged on the inner toothed disc and the outer toothed sleeve on a side away from the end cover for driving the steel sheets and the friction sheets to move:

[0007] The normally closed driving mechanism includes a cylinder block fixedly installed at one end of the internal gear disk away from the end cover. A first piston with its end facing the external gear sleeve is installed inside the cylinder block. At the end of the first piston, a second piston for pushing the steel sheet and the friction plate to move, separate, and fit is fixedly installed facing the steel sheet. An air inlet for introducing pressure to make the second piston move away from the steel sheet and cause the steel sheet and the friction plate to separate is provided on the cylinder block. An air passage for connecting the air inlet and the first piston is provided inside the cylinder block. A braking spring is fixedly installed between the outer wall of the cylinder block and the opposite surface of the second piston. In this way, when no gas is introduced into the air inlet, there is no gas pushing on the left side of the first piston. The first piston is pushed by the braking spring to drive the second piston, and the steel sheet and the friction plate are tightly combined. The brake is in the braking state, and the external gear sleeve, the steel sheet, and the input end do not rotate. When the air inlet on the brake is ventilated, the first piston is pushed to the right by the gas introduced from the air passage, thereby driving the second piston fixedly connected thereto to also move to the right. Multiple groups of steel sheets and friction plates are separated under the action of the wave spring, and the brake is in the released state. The external gear sleeve, the steel sheet, and the input end rotate together. Compared with the traditional normally open structure, this device adopts a normally closed structure, which better meets the working conditions that require long-term combination.

[0008] Preferably, in order to ensure the sealing performance between the cylinder block and the first piston, a sealing ring is radially installed between the cylinder block and the first piston to ensure airtightness and ensure the stable movement of the first piston inside the cylinder block.

[0009] Preferably, in order to ensure the synchronous movement of the first piston and the second piston, the first piston and the second piston are fixedly connected by an internal hexagonal screw. The disassembly and assembly are carried out by rotating or loosening the internal hexagonal screw, which is convenient and fast.

[0010] Preferably, in order to install the braking spring, receiving cavities are symmetrically arranged on the opposite surfaces of the outer wall of the cylinder block and the second piston. Both ends of the braking spring are inserted into the two receiving cavities. Through the split-type cylinder block and the second piston, when installing, the braking spring is placed in the receiving cavity on the cylinder block, and then the receiving cavity on the second piston is aligned with the other end of the braking spring. Subsequently, the second piston and the first piston are fixed, and the installation is convenient and fast.

[0011] Preferably, in order to fix the end cover, the internal gear disk, and the cylinder block, through holes are provided in the side walls of the end cover, the internal gear disk, and the cylinder block. The end cover, the internal gear disk, and the cylinder block are fixed on the equipment fixing plate by long bolts passing through the through holes, and they are always fixed and immovable, ensuring the stable progress of subsequent work.

[0012] When no gas is introduced into the air inlet of the brake, there is no gas pushing on the left side of piston 1. Piston 2 is pushed by the braking spring, and the steel sheet and the friction plate are tightly combined. The brake is in the braking state, and the outer gear sleeve, the steel sheet and the input end do not rotate. When the air inlet on the brake is ventilated, piston 1 is pushed to the right by the gas introduced from the air passage, thereby driving piston 2 fixedly connected thereto to also move to the right. Multiple groups of steel sheets and friction plates are separated under the action of the wave spring, and the brake is in the released state. The outer gear sleeve, the steel sheet and the input end rotate together. Compared with the traditional normally open structure, this device adopts a normally closed structure, which better meets the working conditions that need to be combined for a long time.

[0013] The brake has a split piston structure and a split internal gear disc and cylinder block structure, which is convenient for processing and installation and reduces costs. A wave spring is added between the steel sheet and the friction plate, the separation is complete, the sliding friction work is reduced, and the outer gear sleeve and the steel sheet have an internal and external gear structure. The outer gear sleeve can be axially moved and adjusted, making the installation more convenient. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a normally closed pneumatic friction brake;

[0015] Figure 2 It is Figure 1 The enlarged schematic diagram at A in

[0016] In the figure:

[0017] 1. End cover; 2. Internal gear disc; 3. Outer gear sleeve; 4. Steel sheet; 5. Friction plate; 6. Wave spring; 7. Normally closed drive mechanism; 71. Cylinder block; 72. Piston 1; 73. Piston 2; 74. Air inlet; 75. Air passage; 76. Braking spring; 77. Sealing ring; 78. Socket head cap screw; 79. Accommodating cavity; 8. Mounting hole. Specific Embodiments

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0019] Embodiment 1

[0020] This embodiment provides a normally closed pneumatic friction brake, as Figure 1-2As shown in the figure, the brake includes an end cover 1, an internal gear disk 2 fixedly installed on one end face of the end cover 1, an external gear sleeve 3 movably installed in the end cover 1 and axially movable through internal and external teeth connection with the end cover 1, a plurality of steel sheets 4 uniformly arranged in the internal gear disk 2 and connected to the internal gear disk 2 through internal and external teeth, a plurality of friction plates 5 uniformly arranged on the outer wall of the external gear sleeve 3 and connected to the external gear sleeve 3 through internal and external teeth and arranged in a staggered manner with the plurality of steel sheets 4 one by one, a corrugated spring 6 arranged between the plurality of steel sheets 4 and the friction plates 5, and a normally closed driving mechanism 7 arranged on the side of the internal gear disk 2 and the external gear sleeve 3 away from the end cover 1 for driving the steel sheets 4 and the friction plates 5 to move:

[0021] The normally closed driving mechanism 7 includes a cylinder block 71 fixedly installed at one end of the internal gear disk 2 away from the end cover 1. A first piston 72 with its end facing the external gear sleeve 3 is installed in the cylinder block 71. A second piston 73 for pushing the steel sheet 4 and the friction plate 5 to move, separate and fit together is fixedly installed at the end of the first piston 72 and facing the steel sheet 4. An air inlet 74 for introducing pressure to make the second piston 73 move away from the steel sheet 4 and cause the steel sheet 4 and the friction plate 5 to separate is provided on the cylinder block 71. An air passage 75 for connecting the air inlet 74 and the first piston 72 is provided in the cylinder block 71. A brake spring 76 is fixedly installed between the outer wall of the cylinder block 71 and the opposite surface of the second piston 73.

[0022] During use, when no gas is introduced into the air inlet 74, there is no gas pushing on the left side of the first piston 72. The first piston 72 is pushed by the compression of the brake spring 76 to drive the second piston 73. The steel sheet 4 and the friction plate 5 are tightly combined, and the brake is in a braking state. The external gear sleeve 3, the steel sheet 4 and the input end do not rotate. When the air inlet 74 on the brake is ventilated, the first piston 72 is pushed to the right by the gas introduced from the air passage 75, thereby driving the second piston 73 fixedly connected thereto to also move to the right. The multiple groups of steel sheets 4 and friction plates 5 are separated under the action of the corrugated spring 6, and the brake is in a released state. The external gear sleeve 3, the steel sheet 4 and the input end rotate together. Compared with the traditional normally open structure, this device adopts a normally closed structure, which better meets the working conditions that require long-term combination.

[0023] Specifically, a sealing ring 77 is radially installed between the cylinder block 71 and the first piston 72. During use, the airtightness is ensured to ensure the stable movement of the first piston 72 in the cylinder block 71.

[0024] More specifically, the first piston 72 and the second piston 73 are fixedly connected by an internal hexagonal screw 78. During use, the disassembly and assembly are carried out by rotating and loosening the internal hexagonal screw 78, which is convenient and fast.

[0025] Furthermore, accommodation cavities 79 are symmetrically arranged on the opposite surfaces of the outer wall of the cylinder block 71 and the second piston 73, and both ends of the braking spring 76 are inserted into the two accommodation cavities 79. During use, with the cylinder block 71 and the second piston 73 arranged in a split manner, when installing, the braking spring 76 is placed into the accommodation cavity 79 on the cylinder block 71, then the accommodation cavity 79 on the second piston 73 is aligned with the other end of the braking spring 76, and subsequently, the second piston 73 and the first piston 72 are fixed, which is convenient and fast for installation.

[0026] Even further, through holes 8 are formed in the end cover 1, the internal gear disk 2, and the side wall of the cylinder block 71 in a penetrating manner. During use, the end cover 1, the internal gear disk 2, and the cylinder block 71 are fixed on the equipment fixing plate by passing long bolts through the through holes 8, and they are always fixed in place to ensure the stable progress of subsequent work.

[0027] As described above, only the preferred specific embodiments of the present application are provided, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent replacements or changes, and all should be covered within the protection scope of the present application.

Claims

1. A normally closed pneumatic friction brake, comprising an end cover (1), an internal gear disk (2) fixedly installed on one end face of the end cover (1), an external gear sleeve (3) movably installed in the end cover (1) and axially movable by connecting with the end cover (1) through internal and external gears, a plurality of steel sheets (4) uniformly arranged in the internal gear disk (2) and connected with the internal gear disk (2) through internal and external gears, a plurality of friction plates (5) uniformly arranged on the outer wall of the external gear sleeve (3) and connected with the external gear sleeve (3) through internal and external gears and arranged in a staggered manner with the plurality of steel sheets (4), a corrugated spring (6) arranged between the plurality of steel sheets (4) and the friction plates (5), and a normally closed driving mechanism (7) arranged on the side of the internal gear disk (2) and the external gear sleeve (3) away from the end cover (1) for driving the steel sheets (4) and the friction plates (5) to move. It is characterized in that: The normally closed driving mechanism (7) includes a cylinder block (71) fixedly installed at one end of the internal gear disk (2) away from the end cover (1). A first piston (72) with its end facing the external gear sleeve (3) is installed in the cylinder block (71). A second piston (73) for pushing the steel sheets (4) and the friction plates (5) to move, separate and fit is fixedly installed at the end of the first piston (72) facing the steel sheets (4). An air inlet (74) for introducing pressure to make the second piston (73) move away from the steel sheets (4) to cause the separation of the steel sheets (4) and the friction plates (5) is opened on the cylinder block (71). An air passage (75) for connecting the air inlet (74) with the first piston (72) is opened in the cylinder block (71). A braking spring (76) is fixedly installed between the outer wall of the cylinder block (71) and the opposite surface of the second piston (73).

2. The normally-closed pneumatic friction brake according to claim 1, characterized in that: A sealing ring (77) is radially installed between the cylinder block (71) and the first piston (72).

3. The normally closed pneumatic friction brake according to claim 1, wherein: The first piston (72) and the second piston (73) are fixedly connected by an internal hexagonal screw (78).

4. The normally-closed pneumatic friction brake according to claim 1, wherein: Receiving cavities (79) are symmetrically arranged on the opposite surfaces of the outer wall of the cylinder block (71) and the second piston (73). Both ends of the braking spring (76) are inserted into the two receiving cavities (79).

5. A normally-closed pneumatic friction brake according to claim 1, wherein: Installation holes (8) are opened through the end cover (1), the internal gear disk (2) and the side wall of the cylinder block (71).

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