Wet multi-disc brakes

Abstract

The utility model discloses a wet multi-disc brake, including an end cover, a static brake piston, a static brake cylinder, a dynamic brake cylinder, a dynamic brake piston, a friction plate assembly, a disc spring group, a transmission sleeve and a transmission flange. The end cover, the static brake cylinder and the dynamic brake cylinder are connected to form a housing through brake connecting bolts. The friction plate assembly includes a plurality of dynamic friction plates and a plurality of static friction plates. The dynamic friction plate is connected to the transmission sleeve through a spline, and the static friction plate is connected to the dynamic brake cylinder through a spline. A disc spring group is arranged between the friction plate assembly and the end cover. The transmission sleeve is installed in the housing through a bearing and is connected to the transmission flange through a spline. The transmission flange is provided with flange connecting bolts, and the transmission sleeve is sealed with the housing through a lip seal ring. The utility model limits the axial and radial displacement of the transmission sleeve through the bearing, and seals by contacting the lip seal ring with the surface of the transmission sleeve. The sealing performance is good, the service life is long, and the difficulty and cost of parts processing are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of brakes, in particular to a wet multi-disc brake suitable for various types of road and non-road vehicle transport equipment and large-scale lifting equipment. Background Art

[0002] Currently, most wet multi-disc actuators on the market use metal end face seals for sealing, and the sealing effect of the seals needs to be guaranteed by controlling the axial dimensions. This has the following problems:

[0003] 1. The installation groove of the metal end face seal has high processing accuracy and size requirements, otherwise it is easy to cause poor sealing or failure;

[0004] 2. The axial positioning dimension requirements are high, and it involves multiple parts on the brake and the host equipment. The dimension chain is too long and difficult to control;

[0005] 3. Metal end face seals need to be installed by professionals using special tools, and the product is difficult to maintain later;

[0006] 4. Metal end face seals are expensive, which is not conducive to product cost control.

[0007] 5. The transmission sleeve has no axial positioning, and the brake has axial and radial movement during use, which affects the sealing effect of the metal end face and even causes oil leakage. Summary of the invention

[0008] Aiming at the deficiencies in the prior art, the utility model provides a wet multi-disc brake.

[0009] The technical solution of the utility model to solve the above problems is:

[0010] A wet multi-disc brake comprises an end cover, a static brake piston, a static brake cylinder, a dynamic brake cylinder, a dynamic brake piston, a friction plate assembly, a disc spring group, a transmission sleeve and a transmission flange. The end cover, the static brake cylinder and the dynamic brake cylinder are connected to form a housing through brake connecting bolts. The friction plate assembly comprises a plurality of dynamic friction plates and a plurality of static friction plates. The dynamic friction plates are connected to the transmission sleeve through splines, and the static friction plates are connected to the dynamic brake cylinder through splines. The dynamic friction plates and the static friction plates are arranged alternately. A disc spring group is provided between the friction plate assembly and the end cover. The transmission sleeve is installed in the housing through a bearing and is connected to the transmission flange through a spline. The transmission flange is provided with flange connecting bolts, and the transmission sleeve is sealed to the housing through a lip sealing ring.

[0011] Furthermore, the transmission sleeve has a stepped sleeve structure, and the outer diameter of the middle part of the sleeve body is larger than the outer diameter of the sleeve shoulders at both ends. The inner walls of the end cover and the dynamic brake cylinder barrel respectively extend inward with installation grooves, and a limiting groove for bearing installation is formed between the installation groove and the sleeve shoulder.

[0012] Furthermore, mounting grooves are respectively provided in the dynamic brake cylinder barrel and the end cover, and the lip sealing ring is arranged in the mounting groove.

[0013] Furthermore, a cooling oil inlet and a cooling oil outlet are provided on the end surface of the dynamic brake cylinder.

[0014] Furthermore, the static brake cylinder and the dynamic brake cylinder are respectively provided with pressure oil inlet and outlet.

[0015] Furthermore, seals are provided between the end cover and the static brake cylinder, between the static brake piston and the static brake cylinder, between the static brake cylinder and the dynamic brake cylinder, between the dynamic brake piston and the dynamic brake cylinder, and between the transmission sleeve and the transmission flange. Beneficial Effects

[0016] The utility model limits the axial and radial displacement of the transmission sleeve by the bearing, and seals the cooling oil of the brake by the contact between the lip sealing ring and the surface of the transmission sleeve. It has good sealing performance and long service life. It has a certain adaptability to the vibration of the mechanism and the beating of the matching shaft. The precision requirements of the installation groove and the matching surface are lower than the precision requirements of the metal end face seal, which reduces the difficulty of part processing. At the same time, the installation position is small, which can make the product more compact, and the installation, maintenance and disassembly are also convenient. It is also convenient to check the installation condition of the seal. Compared with the metal end face seal, it has a lower price and a shorter delivery cycle, which is beneficial to the cost control of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of a preferred embodiment of the utility model;

[0018] Figure 2 for Figure 1 Section view along AA;

[0019] Figure 3 It is a rear view of a preferred embodiment of the utility model;

[0020] In the figure: transmission flange 1, end cover 2, static brake piston 3, static brake cylinder 4, dynamic brake cylinder 5, dynamic brake piston 6, lip seal 7, bearing 8, transmission sleeve 9, brake fixing bolt 10, seal 11, dynamic friction plate 12, static friction plate 13, disc spring assembly 14, brake connecting bolt 15, flange connecting bolt 16, cooling oil inlet 17, cooling oil outlet 18, pressure oil inlet and outlet 19, mounting groove 20. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0022] Examples, such as Figures 1 to 3The structure shown in the figure includes an end cover 2, a static brake piston 3, a static brake cylinder 4, a dynamic brake cylinder 5, a dynamic brake piston 6, a friction plate assembly, a disc spring group 14, a transmission sleeve 9 and a transmission flange 1. The end cover 2, the static brake cylinder 4 and the dynamic brake cylinder 5 are connected to form a housing through a brake connecting bolt 15. The friction plate assembly includes a plurality of dynamic friction plates and a plurality of static friction plates. The dynamic friction plate 12 is connected to the transmission sleeve 9 through a spline, and the static friction plate 13 is connected to the dynamic brake cylinder 5 through a spline. The dynamic friction plate 12 and the static friction plate 13 are arranged alternately. A disc spring group 14 is provided between the friction plate assembly and the end cover 2. The transmission sleeve 9 is installed in the housing through a bearing 8 and is connected to the transmission flange 1 through a spline. The transmission flange 1 is provided with flange connecting bolts 16. The transmission sleeve 9 is sealed with the housing through a lip seal ring 7. The axial and radial displacements of the transmission sleeve 9 are limited by the bearing 8, thereby ensuring the use effect of the lip seal ring 7 and bearing the radial load during braking.

[0023] In this embodiment, the transmission sleeve 9 has a stepped sleeve structure, and the outer diameter of the middle part of the sleeve body is larger than the outer diameter of the sleeve shoulders at both ends. The inner walls of the end cover 2 and the dynamic brake cylinder 5 respectively extend inward with installation grooves 20, and a limiting groove for the installation of the bearing 8 is formed between the installation groove 20 and the sleeve shoulder. The limiting groove can limit the two sides of the bearing 8 to prevent the axial movement of the bearing.

[0024] In this embodiment, mounting grooves are respectively provided in the dynamic brake cylinder 5 and the end cover 2, and the lip seal ring 7 is arranged in the mounting grooves.

[0025] In this embodiment, a cooling oil inlet 17 and a cooling oil outlet 18 are formed on the end surface of the dynamic brake cylinder 5 .

[0026] In this embodiment, the static brake cylinder 4 and the dynamic brake cylinder 5 are respectively provided with pressure oil inlet and outlet 19 .

[0027] In this embodiment, seals 11 are provided between the end cover 2 and the static brake cylinder 4, between the static brake piston 3 and the static brake cylinder 4, between the static brake cylinder 4 and the dynamic brake cylinder 5, between the dynamic brake piston 6 and the dynamic brake cylinder 5, and between the transmission sleeve 9 and the transmission flange 1.

[0028] The installation and working principle of the utility model are as follows: the brake is connected to the fixed end of the equipment through the brake fixing bolt 10, and the static friction plate 13 cooperates with the dynamic brake cylinder 5 through the spline, so that the static friction plate 13 can only move in the axial direction and cannot rotate. One side of the transmission flange 1 is connected to the output end of the equipment through the flange connecting bolt 16, and the other side cooperates with the transmission sleeve 9 through the spline. The transmission sleeve 9 is supported by the bearing 8 and cooperates with the dynamic friction plate 12 through the spline thereon. The dynamic friction plate 12 can rotate with the output end of the equipment and can move axially; when the brake is working, the external cooling oil enters the brake through the cooling oil inlet 17 and passes through the friction plate assembly and the internal cavity and flows out from the cooling oil outlet 18, taking away the heat generated by braking. When the cooling oil circulates inside the brake, the lip seal 7 seals the rotating part to avoid leakage of cooling oil.

[0029] a) During dynamic braking: first, pressurized oil is introduced into the static brake cylinder 4, and the static brake piston 3 moves and compresses the disc spring group 14 to produce a specified displacement; the pressure acting on the dynamic friction plate 12 and the static friction plate 13 is released, and a specified gap is generated between the dynamic friction plate 12 and the static friction plate 13, and then pressurized oil is introduced into the dynamic brake cylinder 5, and the dynamic brake piston 6 converts the oil pressure into a clamping force acting on the dynamic friction plate 12 and the static friction plate 13, so that the dynamic friction plate 12 and the static friction plate 13 are in contact and a specified torque is generated. The magnitude of the torque can be adjusted by the magnitude of the oil pressure.

[0030] b) During static braking, the disc spring force is transmitted to the static brake piston 3, and acts on the dynamic friction plate 12 and the static friction plate 13 through the piston, so that the dynamic friction plate 12 and the static friction plate 13 are in contact and generate a specified torque.

[0031] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wet multi-disc brake, comprising an end cover (2), a static brake piston (3), a static brake cylinder (4), a dynamic brake cylinder (5), a dynamic brake piston (6), a friction plate assembly, a disc spring assembly (14), a transmission sleeve (9) and a transmission flange (1), characterized in that: The end cover (2), the static brake cylinder (4), and the dynamic brake cylinder (5) are connected to form a housing through brake connecting bolts (15); the friction plate assembly comprises a plurality of dynamic friction plates and a plurality of static friction plates; the dynamic friction plate (12) is connected to the transmission sleeve (9) through a spline; the static friction plate (13) is connected to the dynamic brake cylinder (5) through a spline; the dynamic friction plate (12) and the static friction plate (13) are arranged alternately; a disc spring group (14) is provided between the friction plate assembly and the end cover (2); the transmission sleeve (9) is installed in the housing through a bearing (8) and is connected to the transmission flange (1) through a spline; the transmission flange (1) is provided with flange connecting bolts (16); the transmission sleeve (9) is sealed with the housing through a lip seal ring (7).

2. The wet multi-disc brake according to claim 1, characterized in that: The transmission sleeve (9) is of a stepped sleeve structure, and the outer diameter of the middle part of the sleeve body is larger than the outer diameter of the sleeve shoulders at both ends. The inner walls of the end cover (2) and the dynamic brake cylinder (5) are respectively provided with mounting grooves (20) extending inwardly, and a limiting groove for mounting the bearing (8) is formed between the mounting groove (20) and the sleeve shoulders.

3. The wet multi-disc brake according to claim 1, characterized in that: The dynamic brake cylinder barrel (5) and the end cover (2) are respectively provided with mounting grooves, and the lip seal ring (7) is arranged in the mounting grooves.

4. The wet multi-disc brake according to claim 1, characterized in that: The end surface of the dynamic brake cylinder (5) is provided with a cooling oil inlet (17) and a cooling oil outlet (18).

5. The wet multi-disc brake according to claim 1, characterized in that: The static brake cylinder (4) and the dynamic brake cylinder (5) are respectively provided with pressure oil inlet and outlet (19).

6. The wet multi-disc brake according to claim 1, characterized in that: Seals (11) are provided between the end cover (2) and the static brake cylinder (4), between the static brake piston (3) and the static brake cylinder (4), between the static brake cylinder (4) and the dynamic brake cylinder (5), between the dynamic brake piston (6) and the dynamic brake cylinder (5), and between the transmission sleeve (9) and the transmission flange (1).

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