A brake suitable for a slewing mechanism

Abstract

The invention discloses a brake suitable for a rotary mechanism, comprising: a brake housing, a bearing, a coupling, a friction pair, a disc spring, an adjustment pad, and a connecting plate; the brake housing is fixedly connected by two semi-arc structures, and when the brake housing is assembled with other accessories: the bearing is fixedly assembled inside the brake housing, the coupling is plugged into the inner diameter of the inner ring of the bearing, the friction pair is meshed on the outer side of the coupling and is located on one end face of the bearing, the piston is mounted on one end of the friction pair, the disc spring is mounted above the piston, the adjustment pad is arranged on the upper end of the disc spring, and the connecting plate is fixedly mounted on the end of the brake housing away from the bearing; the connecting plate is fixedly connected to the brake housing by a plurality of radially arranged bolts, and a pre-tightening force is applied to the inside of the brake housing, so that the friction pair forms a static friction force to brake the coupling; the brake housing of the invention has simple processing and high processing efficiency, and the brake structure is simple, compact in assembly, convenient to disassemble, and high in reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of slewing mechanisms for truck-mounted cranes, and in particular relates to a brake suitable for slewing mechanisms. Background Art

[0002] The brake is an important functional component of the slewing reducer on the truck crane. It mainly plays a braking role to prevent the slewing mechanism from rotating when it is not driven by hydraulic pressure. Since most brake housings and friction plates are fixed with involute internal and external teeth, when processing the brake housing, a slotting machine is used to slot the teeth, which has low processing efficiency and high cost, affecting the production capacity of the slewing mechanism. A backing groove must be left at the bottom of the gear inside the brake, and the width of the backing groove should not be too small to facilitate slotting and effectively clean iron filings, resulting in a high height of the brake housing and waste of material costs. When assembling the brake assembly, the backing groove of the brake housing is an invalid part and the friction plate cannot be placed. A pad needs to be added to cover the backing groove, and then the friction plate needs to be assembled. The structure is complex and the assembly efficiency is low. The friction plate adopts dry friction, wears quickly, and the brake safety factor is low. In addition, the coupling in the brake in the prior art has no bearing positioning, the operation is unstable and prone to eccentric wear, and the equipment life is short. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a brake suitable for a rotary mechanism. The brake housing and friction pair of the present invention, which are constructed with a semi-circular arc structure, are simple to process. The brake housing with a semi-circular arc structure is easy to operate during processing, thereby improving processing efficiency and product qualification rate, and avoiding the problem of processing the existing brake housing back-cut groove; secondly, through the assembly of the brake housing and other components, it has the advantages of simple structure, compact assembly, convenient disassembly and high reliability.

[0004] Technical solution: In the first aspect, the present invention provides a brake suitable for a slewing mechanism, comprising:

[0005] Brake housing, bearing fixedly assembled inside the brake housing, coupling plugged into the inner diameter of the inner ring of the bearing, friction pair meshed on the outer surface of the coupling and located on one end surface of the bearing, piston installed at one end of the friction pair, disc spring installed on the piston, adjustment pad arranged at the upper end of the disc spring, and connection plate fixedly installed at the end of the brake housing away from the bearing;

[0006] The brake housing is assembled by two sets of completely identical semicircular arc structures;

[0007] The end face of the brake housing away from the bearing is fixedly connected to the connecting plate by a plurality of radially arranged bolts. After the connecting plate is fixed, the adjusting pad, disc spring and piston assembled inside the brake housing sequentially apply force to the friction pair, so that the friction pair forms a static friction force to brake the coupling; the internal part of the brake is pre-tightened by the connecting plate, so that the brake is in a closed state when there is no hydraulic oil input.

[0008] In a further embodiment, a through hole is provided at one end of the brake housing mounting bearing for the coupling to pass through after being assembled with the brake housing, and the coupling is connected to the rotary mechanism through the passing end.

[0009] In a further embodiment, the friction pair adopts two sets of completely identical semicircular arc structures, the brake housing is an inner semicircular arc, and the friction pair is an outer semicircular arc adapted to the brake housing; the brake housing and the friction pair are assembled separately and then the semicircular arc structures are spliced ​​and assembled to form the circumferential structure of the brake housing and the friction pair.

[0010] In a further embodiment, the outer side surface of the piston is close to the inner wall of the brake housing, and a first groove and a second groove are radially opened on the outer side surface of the piston, a first combined sealing ring is installed in the first groove, and a second combined sealing ring is installed in the second groove. After the brake housing and the piston are assembled, a cavity is formed between the first combined sealing ring and the second combined sealing ring, and the cavity is used to input hydraulic oil to push the piston upward.

[0011] In a further embodiment, the friction pair is configured by stacking a plurality of alternating static friction plates and dynamic friction plates, and the static friction plates are wet friction plates; the static friction plates and dynamic friction plates form static friction under the action of axial pressure.

[0012] In a further embodiment, an inner diameter surface of the friction pair is provided with an inner rectangular spline, and an assembly section surface of the coupling and the friction pair is provided with an outer rectangular spline meshing with the inner diameter surface of the friction pair.

[0013] In a further embodiment, an O-ring is provided at the fixing point between the connecting disc and the brake housing to prevent the lubricating oil of the brake housing from overflowing.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0015] (1) The brake housing and friction pair with a semicircular arc structure are easy to process. The brake housing with a semicircular arc structure is easy to operate during processing, thereby improving processing efficiency and product qualification rate, and avoiding the problems of existing brake housing backhoe processing;

[0016] (2) The assembly of the brake housing and other components has the advantages of simple structure, compact assembly, convenient disassembly and high reliability;

[0017] (3) The brake housing and the assembly end of the slewing mechanism are open structures. After being connected to the slewing mechanism, the gear oil inside the slewing mechanism can lubricate the bearings and friction plates. At the same time, the abrasive particles of the friction pair after long-term wear can also be discharged, which improves the reliability of braking and ensures that the bearings and friction plates are adequately lubricated when the slewing mechanism is in operation. In addition, a bearing is arranged in the open structure to position the output coupling, ensuring that the coupling can input high speed and low torque along with the slewing mechanism;

[0018] (4) Compared with dry friction plates, wet friction plates have less friction loss, better heat dissipation, lower temperature rise, and longer service life. They can transmit greater torque, ensure coordination with the brake housing, and improve the braking safety factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the brake assembly of the present invention;

[0020] Figure 2 It is a structural diagram of the brake housing of the present invention.

[0021] Figure numerals: 1. coupling, 2. adjustment pad, 3. disc spring, 4. connecting plate, 5. O-ring, 6. first combined sealing ring, 7. brake housing, 8. second combined sealing ring, 9. piston, 10. friction moving plate, 11. friction stationary plate, 12. bearing. DETAILED DESCRIPTION

[0022] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with specific embodiments below, but is not limited thereto.

[0023] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with specific embodiments below, but is not limited thereto.

[0024] like Figure 1 and Figure 2 A brake suitable for a rotary mechanism shown includes: a coupling 1, an adjustment pad 2, a disc spring 3, a connecting plate 4, an O-ring 5, a first combined seal 6, a brake housing 7, a second combined seal ring 8, a piston 9, a friction moving plate 10, a friction stationary plate 11, and a bearing 12.

[0025] Among them, the front and rear ends of the brake housing 7 are open structures, and the brake housing 7 is assembled by two sets of completely identical semicircular arc structures; when the brake is assembled: the bearing 12 is fixedly assembled inside the brake housing 7, the coupling 1 is plugged into the inner diameter of the inner ring of the bearing 12, the friction pair is engaged on the outer surface of the coupling 1 and is located on one end surface of the bearing 12, the piston 9 is installed at one end of the friction pair, the disc spring 3 is installed above the piston 9, the adjustment pad 2 is arranged at the upper end of the disc spring 3, and the connecting plate 4 is fixedly installed at the end of the brake housing 7 away from the bearing 12;

[0026] A plurality of screw holes are radially opened on one end face of the brake housing 7 away from the bearing 12, and the connecting plate 4 is fixedly connected to the brake housing 7 by a plurality of radially arranged bolts. After the connecting plate 4 is fixedly connected to the brake housing 7, the adjusting pad 2, disc spring 3 and piston 9 assembled inside the brake housing 7 apply force to the friction pair in sequence, so that the friction pair forms a static friction force to brake the coupling 1, and finally the internal part of the brake is pre-tightened through the connecting plate 4, so that the brake is in a closed state when there is no hydraulic oil input.

[0027] A through hole is opened at one end of the brake housing 7 where the bearing 12 is installed, for the coupling 1 to pass through after being assembled with the brake housing 7. The coupling 1 is connected to the rotary mechanism through the passed-through end, and the passed-through coupling 1 is supported and positioned by the bearing 12, ensuring that the coupling 1 runs stably with the rotary mechanism and is not prone to eccentric wear, thereby extending the life of the equipment and increasing reliability.

[0028] The existing brake housing 7 adopts an integrated structure. During processing, the gear is slotted using a slotting machine, which has low processing efficiency and high cost, affecting the production capacity of the rotary mechanism. A backing groove must be left at the bottom of the gear inside the brake, and the width of the backing groove should not be too small to facilitate the gear slotting and effectively clean the iron filings, resulting in a high height of the brake housing 7 and a waste of material costs. When assembling the brake assembly, the backing groove of the brake housing 7 is an invalid part and the friction plate cannot be placed. A pad needs to be added to cover the backing groove. Therefore, the brake housing 7 with an integrated structure has many shortcomings in actual production and manufacturing.

[0029] In this embodiment, the brake housing 7 and the friction pair adopt two groups of completely identical semicircular arc structures, wherein the brake housing 7 is an inner semicircular arc, and the friction pair is an outer semicircular arc adapted to the brake housing 7; the brake housing 7 and the friction pair semicircular arc structures are assembled separately and then spliced ​​and assembled between the semicircular arc structures to form the circumferential structure of the brake housing 7 and the friction pair; the semicircular arc structure is convenient for the slotting machine to perform gear slotting, has high processing efficiency, is easy to clean iron chips, and does not need to consider the width of the tool backing groove.

[0030] The outer diameter surface of the piston 9 is in contact with the inner wall of the brake housing 7. The outer side surface of the piston 9 is radially provided with a first groove and a second groove. The first groove is provided with a first combination seal 6 rings, and the second groove is provided with a second combination seal 8. After the brake housing 7 and the piston 9 are assembled, a cavity is formed between the first combination seal 6 rings and the second combination seal 8. The cavity is used to input hydraulic oil to push the piston 9 upward.

[0031] The friction pair is composed of a plurality of alternately stacked friction plates 11 and friction plates 10. The friction plates 11 are wet friction plates. The friction plates 11 and friction plates 10 form static friction under the action of axial pressure.

[0032] An inner diameter surface of the friction pair is provided with an inner rectangular spline, and an assembly section surface of the coupling 1 and the friction pair is provided with an outer rectangular spline meshing with the inner diameter surface of the friction pair.

[0033] An O-ring 5 is provided at the fixing point between the connecting disc 4 and the brake housing 7 to prevent the lubricating oil of the brake housing 7 from overflowing.

[0034] Working principle:

[0035] The hydraulic oil is input into the cavity of the brake housing 7 through the driving pump, and the cavity pressure increases; under the action of the increased oil pressure, the piston 9 moves upward, causing the disc spring 3 to compress the output axial upward pressure, and then the spring force output by the disc spring 3 cannot act on the friction pair through the piston 9; the force on the friction pair static plate 11 and the friction moving plate 10 is reduced, so that the static friction force of the friction pair is reduced. At the same time, the coupling 1 is driven by the rotary mechanism to operate at high speed and drive the friction pair to rotate together. When the friction pair rotates, under the action of centrifugal force, the friction static plate 11 and the friction moving plate 10 are completely separated, and the static friction force of the friction pair is reduced to zero; the braking function of the brake is temporarily invalid when the static friction force is zero and is in an open state, which makes the coupling The coupling 1 runs smoothly with the slewing mechanism; the hydraulic oil is output from the cavity of the brake housing 7 through the driving pump, and the cavity pressure is reduced; under the action of the reduced oil pressure, the disc spring 3 releases the downward force, driving the piston 9 to move downward, thereby compressing the friction pair downward; after the friction pair is subjected to force, the separated static friction plate 11 and the dynamic friction plate 10 are relatively close, and the contact area between the static friction plate 11 and the dynamic friction plate 10 is increased, so that the static friction force of the friction pair is increased; when the coupling 1 runs at high speed, the friction pair rotates with the coupling 1. During the process, the static friction force of the friction pair gradually increases, so that the resistance to the operation of the coupling 1 increases. At this time, the brake is in a closed state and the braking function is restored to brake the coupling 1 and the slewing mechanism.

[0036] In summary, the brake housing 7 and the friction pair with a semicircular arc structure of the present invention are simple to process. The brake housing 7 with a semicircular arc structure is easy to operate during processing, thereby improving processing efficiency and product qualification rate, and avoiding the problem of processing the existing brake housing 7 back cutter groove; the assembly of the brake housing 7 and other components has the advantages of simple structure, compact assembly, convenient disassembly and high reliability; the brake housing 7 and the assembly end of the rotary mechanism are open structures. After being connected to the rotary mechanism, the gear oil inside the rotary mechanism can lubricate the bearing 12 and the friction plate, and the abrasive particles of the friction pair after long-term wear can also be discharged, thereby improving the reliability of braking and ensuring that the bearing 12 and the friction plate are sufficiently lubricated when the rotary structure is running. The bearing 12 is arranged in the open structure to position the output coupling 1, ensuring that the coupling 1 is input with high speed and low torque along with the rotary mechanism; the friction static plate 11 adopts a wet friction plate, which has less friction loss, better heat dissipation, lower temperature rise and longer service life than a dry friction plate, can transmit a larger torque, ensures the coordination with the brake housing 7, and improves the braking safety factor.

[0037] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A brake suitable for a slewing mechanism, characterized in that: include: A brake housing, a bearing fixedly mounted inside the brake housing, a coupling plugged into the inner diameter of the inner ring of the bearing, a friction pair meshed on the outer surface of the coupling and located on one end surface of the bearing, a piston mounted on one end of the friction pair, a disc spring mounted on the piston, an adjustment pad disposed on the upper end of the disc spring, and a connecting plate fixedly mounted on the end of the brake housing away from the bearing; The brake housing is assembled by two sets of completely identical semicircular arc structures; The end surface of the brake housing away from the bearing is fixedly connected to the connecting plate by a plurality of radially arranged bolts. After the connecting plate is fixed, the adjusting pad, the disc spring and the piston assembled inside the brake housing sequentially apply force to the friction pair, so that the friction pair forms a static friction force to brake the coupling; One end of the brake housing where the bearing is mounted is provided with a through hole for the coupling to pass through after being assembled with the brake housing, and is connected to the rotary mechanism through the through end of the coupling; The friction pair is assembled by two groups of completely identical semicircular arc structures, the semicircular arc structure of the brake housing is an inner semicircular arc, and the friction pair is an outer semicircular arc adapted to the brake housing; the brake housing and the friction pair semicircular arc structures are assembled separately and then the semicircular arc structures are spliced ​​and assembled to form the circumferential structure of the brake housing and the friction pair; The front and rear ends of the brake housing are open structures. The brake housing and the assembly end of the slewing mechanism are open structures. After being connected with the slewing mechanism, the gear oil inside the slewing mechanism can lubricate the bearings and friction plates, and at the same time discharge the abrasive particles caused by long-term wear of the friction pair; The outer side surface of the piston is close to the inner wall of the brake housing, and the outer side surface of the piston is radially provided with a first groove and a second groove, the first groove is fitted with a first combined seal ring, and the second groove is fitted with a second combined seal ring. After the brake housing and the piston are assembled, a cavity is formed between the first combined seal ring and the second combined seal ring, and the cavity is used to input hydraulic oil, and the piston is pushed upward by the oil pressure; The friction pair is composed of a plurality of friction static plates and friction dynamic plates which are alternately stacked in sequence, and the friction static plates are wet friction plates; The piston moves upward, compressing the disc spring upward to output axial upward pressure, so that the spring force output by the disc spring cannot act on the friction pair through the piston; the force on the friction plate and the friction moving plate of the friction pair is reduced, so that the static friction force of the friction pair is reduced. At the same time, the coupling is driven by the rotary mechanism to rotate at high speed, and drives the friction pair to rotate together. When the friction pair rotates, under the action of centrifugal force, the friction plate and the friction moving plate are completely separated, and the static friction force of the friction pair is reduced to zero; the braking function of the brake is temporarily invalid and in the open state when the static friction force is zero, so that the coupling runs smoothly with the rotary mechanism; the hydraulic oil is passed through the drive The dynamic pump outputs from the cavity of the brake housing, and the cavity pressure decreases; under the action of the reduced oil pressure, the disc spring releases the downward force, driving the piston to move downward and thereby compressing the friction pair downward; after the friction pair is subjected to force, the separated static friction plate and dynamic friction plate are relatively close to each other, and the contact area between the static friction plate and the dynamic friction plate increases, thereby increasing the static friction force of the friction pair; when the coupling is running at high speed, the friction pair rotates with the coupling, and the static friction force of the friction pair gradually increases, thereby increasing the resistance to the operation of the coupling, and at this time the brake is in a closed state and the braking function is restored to brake the coupling and the slewing mechanism.

2. A brake suitable for a slewing mechanism according to claim 1, characterized in that: An inner diameter surface of the friction pair is provided with an inner rectangular spline, and an assembly section surface of the coupling and the friction pair is provided with an outer rectangular spline meshing with the inner diameter surface of the friction pair.

3. A brake suitable for a slewing mechanism according to claim 1, characterized in that: An O-type sealing ring is laid at the fixing position between the connecting disc and the brake housing.

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