Motor tail end wet brake for mixer truck

Abstract

The invention relates to the field of brakes, in particular to a motor tail end wet brake for a mixer truck. The brake comprises an outer end cover, a shell, a friction disc, a friction plate, a piston, a disc spring set and a driving assembly. The multiple friction discs are installed on the periphery of the driving assembly in the axial direction in a clamped and sleeved mode. A key groove is formed in the inner circumferential surface of the shell; the peripheries of the friction plates are clamped in the shell in a sliding mode through key grooves, the multiple friction plates are arranged in the axial direction of the shell at intervals, and a space for the friction discs to be distributed is formed between every two adjacent friction plates. The piston is arranged in the shell in a sliding mode and faces the friction plate, a first oil seal and a second oil seal are installed between the piston and the shell in a sliding and sealing mode, an oil cavity communicated with the inlet and outlet is formed between the piston and the shell, and the first oil seal and the second oil seal are distributed on the two sides of the oil cavity. The outer end cover is arranged at the front end of the shell. Braking is relieved by inputting high-pressure hydraulic oil, braking is conducted again through pressure relief, the friction braking effect between the multiple friction plates and the multiple friction discs is good, and the service life is long.

Description

Technical Field

[0001] This invention relates to the field of brakes, and in particular to a wet brake at the tail end of a motor for a mixer truck. Background Technology

[0002] Mixer trucks are a common type of construction vehicle. The rotation braking of the mixer truck tank typically uses dry braking. Dry braking mainly consists of a brake drum (rotating coaxially with the wheels), brake shoes (with friction linings on the inside), a return spring, and a brake caliper (pneumatically or hydraulically driven). When the driver depresses the brake pedal, two arc-shaped brake shoes open outwards and press tightly against the inner wall of the rotating brake drum. Through friction, the vehicle's kinetic energy is converted into heat energy, thereby achieving deceleration and stopping. However, the friction braking effect between the brake shoes and the brake drum is limited, and the braking effect and service life of traditional dry braking structures need further improvement. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a wet brake at the tail end of the motor for a mixer truck. The brake is released by inputting high-pressure hydraulic oil and re-engaged by depressurization. The friction braking effect between multiple friction pads and multiple friction discs is good and the service life is long.

[0004] The technical solution of this invention is a wet brake at the tail end of a motor for a mixer truck, comprising an outer end cover, a housing, a friction disc, friction pads, a piston, a disc spring assembly, and a drive assembly; multiple friction discs are axially mounted on the outer periphery of the drive assembly; the housing has an inlet and outlet, and a keyway on the inner circumferential surface of the housing; the friction pads are slidably secured within the housing via the keyway, and multiple friction pads are spaced apart along the axial direction of the housing, forming a space between each pair of adjacent friction pads for the distribution of the friction discs; the piston is slidably disposed within the housing, facing the friction pads, and oil seal one and oil seal two are slidably sealed between the piston and the housing, forming an oil cavity communicating with the inlet and outlet, with oil seal one and oil seal two distributed on both sides of the oil cavity; the outer end cover is disposed at the front end of the housing; multiple disc spring assemblies are annularly mounted between the outer end cover and the piston.

[0005] Preferably, the drive assembly includes a drive shaft, a drive wheel mounted on the outer periphery of the drive shaft, a pressure plate located on one side of the end of the drive wheel, and a bolt that presses the pressure plate onto the drive wheel, the bolt being threadedly connected to the drive shaft.

[0006] Preferably, the outer periphery of the drive wheel has a spline groove, and the inner periphery of the friction disc has a spline structure adapted to the spline groove.

[0007] Preferably, multiple protrusions are arranged in an array on both sides of the friction disc, and the multiple protrusions are distributed at intervals.

[0008] Preferably, the outer periphery of the friction disc has multiple notches.

[0009] Preferably, a proximity sensor facing the piston is provided on the outer end cap.

[0010] Preferably, an inner end cap is provided at the rear end of the housing, and an O-ring is provided between the housing and the inner end cap.

[0011] Preferably, the housing has an oil inlet and an oil outlet opposite to each other, and both the oil inlet and the oil outlet are connected to the friction disc distribution area.

[0012] Preferably, the inner end cover is threaded with a number of bolts two and a number of bolts three that penetrate the housing and press against the outer end cover. The ends of bolts two protrude from the inner end cover, and the ends of bolts three are located inside the inner end cover.

[0013] Preferably, the outer end cap is threaded with bolt four, the housing is threaded with bolt five passing through the outer end cap, bolt five is longer than bolt four, and the piston end has an internal thread adapted to bolt five.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention uses high-pressure hydraulic oil input from the inlet and outlet to push the piston outward, and the piston no longer squeezes the friction plate, thereby releasing the brake. Braking is re-engaged by depressurization, and the disc spring assembly pushes the piston to squeeze the friction plate. The friction braking effect between multiple friction plates and multiple friction discs is good. Cooling oil is introduced into the area where the friction discs are located to cool and dissipate the heat generated by friction braking, resulting in a long service life of wet brakes. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram from the rear view of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure from the front view of an embodiment of the present invention; Figure 3 For this Figure 2 Structural sectional view; Figure 4 This is a partial exploded view of an embodiment of the present invention; Figure 5 This is a schematic diagram of the friction plate structure; Figure 6 This is a schematic diagram of the friction disc.

[0016] Reference numerals: 1. Outer end cap; 2. Housing; 201. Oil inlet; 202. Oil outlet; 203. Inlet / outlet; 3. Inner end cap; 4. Rubber pad; 5. Drive shaft; 6. Drive wheel; 7. Pressure plate; 8. Bolt 1; 9. Friction disc; 10. Friction plate; 11. O-ring; 12. Piston; 13. Oil seal 1; 14. Oil seal 2; 15. Plug 1; 16. Plug 2; 17. Plug 3; 18. Disc spring assembly; 19. Proximity sensor; 20. Bolt 2; 21. Bolt 3; 22. Bolt 4; 23. Bolt 5. Detailed Implementation

[0017] like Figures 1-6 As shown in this embodiment, a wet brake for the motor tail end of a mixer truck includes an outer end cover 1, a housing 2, a friction disc 9, a friction pad 10, a piston 12, a disc spring assembly 18, and a drive assembly.

[0018] The drive assembly includes a drive shaft 5, a drive wheel 6 mounted on the outer periphery of the drive shaft 5, a pressure plate 7 located on one side of the end of the drive wheel 6, and a bolt 8 that presses the pressure plate 7 onto the drive wheel 6. The drive shaft 5 is part of the motor. The bolt 8 is threadedly connected to the drive shaft 5. The pressure plate 7 can press the drive wheel 6 and the drive shaft 5 together, and the drive shaft 5 can drive the drive wheel 6 to rotate.

[0019] like Figures 3-6 As shown, multiple friction discs 9 are axially mounted on the outer periphery of the drive assembly. The outer periphery of the drive wheel 6 has a spline groove, and the inner periphery of the friction disc 9 has a spline structure that matches the spline groove of the drive wheel 6, so that the drive wheel 6 can drive the friction disc 9 to rotate. Multiple bosses are arrayed on both end faces of the friction disc 9, and the multiple bosses are spaced apart, thereby improving the braking and heat dissipation effect when in contact with the friction plate 10.

[0020] like Figures 2-4 As shown, housing 2 has inlet and outlet 203, with threaded connections to plug 17. The inner circumferential surface of housing 2 has a keyway. Inner end cover 3 is threadedly connected to several bolts 20 and 21 that penetrate housing 2 and press against outer end cover 1. Bolts 20 protrude from the inner end cover 3 and are used for connection to the motor end. Bolts 21 are located inside inner end cover 3 and are used only for connection between outer end cover 1, housing 2, and inner end cover 3. This bolted connection method facilitates the disassembly and maintenance of the brake.

[0021] like Figures 3-5 As shown, the friction plates 10 are slidably secured within the housing 2 via keyways on their outer periphery. Multiple friction plates 10 are spaced apart along the axial direction of the housing 2, forming a space between each pair of adjacent friction plates 10 for the distribution of the friction disc 9. The friction plate 10 near the piston 12 can be pressed by the piston 12, while the friction plate 10 at the other end is located on one side of the inner end cover 3. The friction plates 10 only move axially and do not rotate, thus providing frictional braking against the rotating friction disc 9.

[0022] The housing 2 and the friction plate 10, the drive shaft 5 and the drive wheel 6, and the drive wheel 6 and the friction disc 9 are all connected by an involute inner and outer spline structure for sliding engagement.

[0023] like Figure 3As shown, multiple sets of disc spring assemblies 18 are installed in a ring between the outer end cap 1 and the piston 12, for example, eight sets. Each set of disc spring assemblies 18 includes multiple disc springs stacked side by side. The piston 12 has a mounting groove for mounting the disc spring assemblies 18 to ensure a stable range of motion for the disc spring assemblies 18.

[0024] Piston 12 is slidably disposed within housing 2, facing friction plate 10. Oil seal 13 and oil seal 24 are slidably sealed between piston 12 and housing 2. Both oil seal 13 and oil seal 24 are D-type oil seals. The inner circumferential surface of housing 2 has an annular groove for the oil seals to be inserted. An oil cavity communicating with inlet / outlet 203 is formed between piston 12 and housing 2. Oil seal 13 and oil seal 24 are distributed on both sides of the oil cavity. When using this brake, remove screw plug 37, connect an oil pipe connector at inlet / outlet 203, and introduce high-pressure hydraulic oil from inlet / outlet 203. The high-pressure oil circuit pressure is 7-8 MPa. The hydraulic oil presses against disc spring assembly 18 outside piston 12. At this time, piston 12 no longer compresses friction plate 10, thereby releasing the friction plate 10 from its contact braking against friction disc 9. After the hydraulic pressure is released through inlet and outlet 203, the disc spring assembly 18 rebounds and pushes the piston 12 to move. The piston 12 pushes the friction plate 10, and the multiple friction plates 10 press against the multiple friction discs 9 to achieve friction braking.

[0025] like Figures 1-3 As shown, the outer end cover 1 is located at the front end of the housing 2, and a proximity sensor 19 facing the piston 12 is provided on the outer end cover 1. The proximity sensor 19 detects the distance to the end face of the piston 12, using 4mm as the dividing line. When high-pressure oil enters from the inlet / outlet 203, the piston 12 moves outward, releasing the brake. At this time, the distance between the piston 12 and the proximity sensor 19 is less than 4mm, and the proximity sensor 19 sends a signal to the controller connected to the communication network. The controller then controls the motor to rotate. When there is no pressure in the high-pressure oil circuit, the disc spring assembly 18 naturally opens, and the piston 12 moves inward and presses against the friction plate 10 for braking. At this time, the distance between the proximity sensor 19 and the piston 12 is greater than 4mm, and the proximity sensor 19 sends a signal to the controller connected to the communication network. The controller then controls the motor to stop working.

[0026] The housing 2 has an oil inlet 201 and an oil outlet 202 oppositely arranged, with a screw plug 15 and a screw plug 16 threadedly connected to the oil inlet 201 and oil outlet 202, respectively. Both the oil inlet 201 and oil outlet 202 are connected to the distribution area of ​​the friction disc 9. For cooling, screw plugs 15 and 16 are removed, and oil pipe connectors are connected to the oil inlet 201 and oil outlet 202. Low-pressure cooling oil is introduced into the friction disc 9 area from the oil inlet 201 and flows out from the oil outlet 202, achieving cooling oil circulation and cooling the heat generated by friction braking between the friction disc 9 and the friction plates 10. The low-pressure cooling oil circuit pressure is 0.2-0.3 MPa. Multiple notches are provided on the outer periphery of the friction disc 9, facilitating the flow of cooling oil through these notches and its circulation within the intervals of the multiple protrusions, resulting in a large cooling range and good cooling effect. An inner end cover 3 is provided at the rear end of the housing 2, and an O-ring 11 is provided between the housing 2 and the inner end cover 3 to achieve a sealed connection. A rubber gasket 4 is provided on the end face of the inner end cover 3. The function of the rubber gasket 4 is to seal between the inner end cover 3 and the motor end to prevent the leakage of low-pressure cooling oil.

[0027] Furthermore, in the event of brake failure and inability to release the brake, the following redundancy design is implemented: Bolt 22 is threaded onto the outer end cover 1, and bolt 23, passing through the outer end cover 1, is threaded onto the housing 2. Bolt 23 is longer than bolt 22, and the piston 12 has an internal thread at its end that matches bolt 23. Bolts 22 and 23 are removed, and bolt 23 is threaded onto the piston 12. Rotating bolt 23 causes the piston 12 to move outward, preventing it from pressing against the friction plates, thus allowing the brake to be released manually.

[0028] In this embodiment, high-pressure hydraulic oil is input from inlet / outlet 203 to push the piston 12 outward. The piston 12 compresses the disc spring assembly 18, and the piston 12 no longer presses against the friction plate 10, thus releasing the brake. Braking is re-engaged by depressurization. The disc spring assembly 18 pushes the piston 12 to press against the friction plate 10. The friction braking effect between multiple friction plates 10 and multiple friction discs 9 is good, and the service life of wet braking is long. Cooling oil is introduced into the area where the friction discs 9 are located to cool and dissipate the heat generated by friction braking, thereby improving the service life of the friction plates 10 and friction discs 9. The rated torque of the brake is 250 N·m.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A wet brake at the tail end of a motor for a concrete mixer truck, characterized in that, include: Driver components; Friction discs (9) are mounted axially around the outer periphery of the drive assembly using multiple ferrules. The housing (2) has an inlet and outlet (203) and a keyway on its inner circumferential surface; The friction plates (10) are slidably mounted in the housing (2) through keyways on their outer periphery. Multiple friction plates (10) are spaced apart along the axial direction of the housing (2), and a space for the distribution of the friction discs (9) is formed between each pair of adjacent friction plates (10). The piston (12) is slidably disposed inside the housing (2) facing the friction plate (10). Oil seal one (13) and oil seal two (14) are slidably sealed between the piston (12) and the housing (2). An oil cavity communicating with the inlet and outlet (203) is formed between the piston (12) and the housing (2). Oil seal one (13) and oil seal two (14) are distributed on both sides of the oil cavity. The outer end cap (1) is located at the front end of the housing (2); The disc spring assembly (18) is installed in multiple rings between the outer end cap (1) and the piston (12).

2. The wet brake at the tail end of the motor for a mixer truck according to claim 1, characterized in that, The drive assembly includes a drive shaft (5), a drive wheel (6) mounted on the outer periphery of the drive shaft (5), a pressure plate (7) located on one side of the end of the drive wheel (6), and a bolt (8) pressing the pressure plate (7) onto the drive wheel (6), the bolt (8) being threadedly connected to the drive shaft (5).

3. A wet brake at the tail end of a motor for a mixer truck according to claim 2, characterized in that, The outer periphery of the drive wheel (6) has a spline groove, and the inner periphery of the friction disc (9) has a spline structure that matches the spline groove.

4. A wet brake at the tail end of a motor for a mixer truck according to claim 1, characterized in that, Multiple protrusions are arranged in an array on both sides of the friction disk (9), and the multiple protrusions are distributed at intervals.

5. A wet brake at the tail end of a motor for a mixer truck according to claim 4, characterized in that, The friction disc (9) has multiple notches on its outer periphery.

6. A wet brake at the tail end of a motor for a mixer truck according to claim 1, characterized in that, The outer end cap (1) is provided with a proximity sensor (19) facing the piston (12).

7. A wet brake at the tail end of a motor for a mixer truck according to claim 1, characterized in that, An inner end cap (3) is provided at the rear end of the housing (2), and an O-ring (11) is provided between the housing (2) and the inner end cap (3).

8. A wet brake at the tail end of a motor for a mixer truck according to claim 7, characterized in that, The housing (2) is provided with an oil inlet (201) and an oil outlet (202) opposite to each other, and both the oil inlet (201) and the oil outlet (202) are connected to the distribution area of ​​the friction disc (9).

9. A wet brake at the tail end of a motor for a mixer truck according to claim 7, characterized in that, The inner end cap (3) is threaded with several bolts two (20) and several bolts three (21) that penetrate the housing (2) and press against the outer end cap (1). The ends of bolts two (20) protrude from the inner end cap (3), and the ends of bolts three (21) are located inside the inner end cap (3).

10. A wet brake at the tail end of a motor for a mixer truck according to claim 1, characterized in that, The outer end cap (1) is threaded with bolt four (22), and the housing (2) is threaded with bolt five (23) passing through the outer end cap (1). Bolt five (23) is longer than bolt four (22), and the piston (12) end has an internal thread that matches bolt five (23).

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