A mine car rear wheel brake structure

Abstract

The utility model discloses a mine car rear wheel brake structure, including rotatable connection on the brake disc of car frame, the brake disc outside is provided with for the brake disc when driving and is pressed from both sides and is parked and is parked and is parked brake mechanism for the brake disc when parking and is pressed from both sides and is parked brake mechanism, the brake mechanism has two and two brake mechanism symmetrical settings at the both sides of brake disc, and the parking brake mechanism is arranged between two brake mechanism, and two brake mechanism, parking brake mechanism all are fixedly connected through bolt and car frame, the brake mechanism is provided with first drive assembly for driving brake mechanism and is pressed from both sides or loosen brake disc action in, and the parking brake mechanism is provided with second drive assembly for driving parking brake mechanism and is pressed from both sides or loosen brake disc action, and first drive assembly, second drive assembly are connected with the hydraulic oil pipeline that sets up on car frame respectively.

Description

Technical Field

[0001] This utility model relates to the field of brakes, and in particular to a rear wheel braking structure for a mining truck. Background Technology

[0002] A brake is a device that decelerates, stops, or keeps a moving part (or moving machinery) at a stop. It is a mechanical part that stops or decelerates moving parts in machinery, commonly known as a brake or brake pad. Patent No. ZL202121513477.1 discloses a lightweight, rust-proof, fixed caliper brake, which achieves friction braking by using a caliper structure to drive friction pads against the brake disc. However, after prolonged use, the friction pads wear down and thin, increasing the gap between the friction pads and the brake disc. This affects the braking efficiency and reduces braking safety, necessitating improvement. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a simple, safe, and efficient rear wheel braking structure for mining cars.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A rear wheel braking structure for a mining car includes a brake disc rotatably connected to a frame. A service brake mechanism for clamping and braking the brake disc during driving and a parking brake mechanism for clamping and braking the brake disc when parked are provided on the outer side of the brake disc. There are two service brake mechanisms symmetrically arranged on both sides of the brake disc, and a parking brake mechanism is located between the two service brake mechanisms. Both service brake mechanisms and the parking brake mechanism are fixedly connected to the frame by bolts. A first drive assembly is provided within the service brake mechanism for clamping or releasing the brake disc, and a second drive assembly is provided within the parking brake mechanism for clamping or releasing the brake disc. The first and second drive assemblies are respectively connected to hydraulic oil lines provided on the frame.

[0006] Furthermore, the service braking mechanism includes a first mounting plate, a second mounting plate, and service friction pads. The first and second mounting plates are symmetrically arranged on both sides of the brake disc. The first or second mounting plate is fixedly connected to the vehicle frame by bolts. The first and second mounting plates are fixedly connected to each other by a first positioning bolt. A first spacer sleeve is sleeved on the outer side of the middle of the first positioning bolt and is located between the first and second mounting plates. Service friction pads corresponding to the first and second mounting plates are provided on the relatively close surfaces of the first and second mounting plates. The two service friction pads are symmetrically arranged on both sides of the brake disc and can move along the thickness direction of the first and second mounting plates. A first drive assembly is fixedly connected to the relatively far surfaces of the first and second mounting plates and pushes the corresponding service friction pads closer to the brake disc to perform clamping braking operation.

[0007] Furthermore, two travel guide posts are fixedly connected to both the first mounting plate and the second mounting plate; the axial direction of the travel guide posts is consistent with the thickness direction of the first mounting plate and the second mounting plate, and the two travel guide posts are set on both sides of the corresponding travel friction pads. The travel friction pads are provided with travel guide grooves that are adapted to the travel guide posts to cooperate with the travel guide posts for guiding operations.

[0008] Furthermore, both the first mounting plate and the second mounting plate are provided with a traveling vehicle sliding through hole, and a traveling vehicle reset bolt is slidably connected through the traveling vehicle sliding through hole. The axial direction of the traveling vehicle reset bolt is consistent with the axial direction of the traveling vehicle guide column. One end of the traveling vehicle reset bolt is fitted with a traveling vehicle reset spring, and the traveling vehicle reset spring is located between the end of the traveling vehicle reset bolt and the end face of the first mounting plate or the second mounting plate. The other end of the traveling vehicle reset bolt passes through the traveling vehicle sliding through hole and is connected to the corresponding traveling vehicle friction pad.

[0009] Furthermore, the first drive assembly includes a travel cylinder liner, a travel brake piston, a push rod, a cup body, a travel return spring, a positioning bushing, and a retaining ring. The travel cylinder liner is fixedly connected to a first mounting plate or a second mounting plate. The travel brake piston is fitted inside the travel cylinder liner and is slidably connected to the travel cylinder liner. The travel brake piston is a cylindrical shell with an open top. The bottom end of the travel brake piston passes through the first mounting plate or the second mounting plate and contacts the end face of the travel friction pad. A push rod is fitted inside the top of the travel brake piston. The top of the push rod extends out of the outer side of the top of the travel cylinder liner and is fixedly connected to the travel cylinder liner by a fastening bolt. A positioning bushing is fitted outside the push rod. The positioning bushing is interference-fitted with the outer wall of the push rod and can move along the axis of the push rod. The cup body is fitted onto the outside of the positioning bushing. The top of the cup body has an inwardly bent structure, which is located at the top of the positioning bushing and its bottom end contacts the top of the positioning bushing. The bottom of the cup body has an outwardly bent structure, and a travel return spring is located at the upper end of the outwardly bent structure. The travel return spring is fitted onto the outside of the cup body, and its top end is located inside the travel brake piston, abutting against a retaining ring engaged with the top of the travel brake piston's interior. The elastic force of the travel return spring is less than the frictional force between the positioning bushing and the push rod. A hydraulic oil passage is provided inside the travel cylinder liner. One end of the hydraulic oil passage is connected to the top of the travel cylinder liner's interior, and the other end is connected to a hydraulic oil pipeline installed on the frame.

[0010] Furthermore, the parking brake mechanism includes a third mounting plate, a fourth mounting plate, and parking friction pads. The third and fourth mounting plates are symmetrically arranged on both sides of the brake disc. The third or fourth mounting plate is fixedly connected to the vehicle frame by bolts. The third and fourth mounting plates are fixedly connected to each other by a second positioning bolt. A second spacer is sleeved on the outer side of the middle of the second positioning bolt and is located between the third and fourth mounting plates. Parking friction pads corresponding to the third and fourth mounting plates are provided on the relatively close surfaces of the third and fourth mounting plates. The two parking friction pads are symmetrically arranged on both sides of the brake disc and can move along the thickness direction of the third and fourth mounting plates. A second drive assembly is fixedly connected to the side of the third mounting plate away from the fourth mounting plate, and the second drive assembly pushes the corresponding parking friction pads close to the brake disc for clamping and braking operation. The fourth mounting plate is connected to the corresponding parking friction pad by a support bolt.

[0011] Furthermore, two parking guide posts are fixedly connected to both the third and fourth mounting plates; the axial direction of the parking guide posts is consistent with the thickness direction of the third and fourth mounting plates, and the two parking guide posts are set on both sides of the corresponding parking friction pads. Parking guide grooves that are adapted to the parking guide posts are provided on both sides of the parking friction pads to cooperate with the parking guide posts for guiding operation.

[0012] Furthermore, both the third and fourth mounting plates are provided with parking sliding through holes, and parking reset bolts are slidably connected through the parking sliding through holes. The axial direction of the parking reset bolt is consistent with the axial direction of the parking guide post. A parking reset spring is sleeved on one end of the parking reset bolt, and the parking reset spring is located between the end of the parking reset bolt and the end face of the third or fourth mounting plate. The other end of the parking reset bolt passes through the parking sliding through hole and is connected to the corresponding parking friction pad.

[0013] Furthermore, the second drive assembly includes a parking cylinder liner, an end cover, a parking brake piston, a parking return spring, and an adjusting nut. The parking cylinder liner is a cylindrical shell with openings at both ends. The bottom end of the parking cylinder liner is fixedly connected to the third mounting plate by bolts, and the top end of the parking cylinder liner is threadedly connected to the end cover. The parking brake piston is sleeved inside the parking cylinder liner and can slide along the axial direction of the parking cylinder liner. The parking brake piston is a cylindrical shell with an open top. The bottom end of the parking brake piston passes through the third mounting plate and contacts the end face of the parking friction pad. An adjusting rod is integrally formed at the center of the parking brake piston. The bottom end of the adjusting rod is connected to the bottom end of the parking brake piston. The top end of the adjusting rod extends out from the center hole on the end cover. The adjusting rod is threadedly connected to the adjusting nut. A parking return spring is sleeved on the outside of the adjusting rod. The bottom end of the parking return spring contacts the bottom end of the parking brake piston, and the top end of the parking return spring contacts the inner wall of the end cover. A push protrusion that increases the outer diameter of the parking brake piston is provided on the outer side of the top end of the parking brake piston. A push groove that increases the inner diameter of the parking cylinder liner is provided on the upper end of the inner side of the parking cylinder liner. The push protrusion is located in the push groove and can slide along the axis of the parking cylinder liner within the push groove. A hydraulic cavity is formed between the bottom end of the push protrusion, the bottom end of the push groove, the inner wall of the parking cylinder liner, and the outer wall of the parking brake piston. The hydraulic cavity corresponds to the hydraulic hole provided on the parking cylinder liner and is connected to the hydraulic oil line provided on the frame through the hydraulic hole.

[0014] Furthermore, a sealing gasket is provided between the bottom end of the service brake piston and the end of the first or second mounting plate near the service friction pad, or between the bottom end of the parking brake piston and the end of the third mounting plate near the parking friction pad. The sealing gasket is ring-shaped, with its outer peripheral edge fitting into the first, second, or third mounting plate, and its inner peripheral edge fitting into the outer wall of the bottom end of the service brake piston or parking brake piston.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are:

[0016] The service brake mechanism of this invention is in a holding brake state when hydraulic oil is supplied into the first drive assembly, and in a released driving state when hydraulic oil is supplied out of the first drive assembly. This mechanism can brake the wheels during driving. The parking brake mechanism of this invention is in a released driving state when hydraulic oil is supplied into the second drive assembly, and in a holding brake state when hydraulic oil is supplied out of the second drive assembly. This mechanism can brake the wheels when the vehicle is parked. Furthermore, the first drive assembly, through the design of a push rod, positioning bushing, cup body, and service brake piston, can automatically compensate for wear of the service friction pads, ensuring that the distance between the worn service friction pads and the brake disc remains consistent with the distance before wear. This avoids the situation where wear of the service friction pads affects the braking efficiency of the brake, effectively improving the braking safety of the brake and thus improving the safety of vehicle driving. It has excellent market promotion value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the vehicle braking mechanism;

[0020] Figure 3 This is a diagram showing the connection structure between the first mounting plate and the vehicle friction pad.

[0021] Figure 4 Top view of the connection structure between the first mounting plate and the first drive assembly;

[0022] Figure 5 A bottom view of the connection structure between the first mounting plate and the first drive assembly;

[0023] Figure 6 This is a cross-sectional view showing the connection between the first mounting plate and the first drive assembly.

[0024] Figure 7 This is a cross-sectional view of the first drive component;

[0025] Figure 8 This is a schematic diagram of the parking brake mechanism;

[0026] Figure 9 This is a diagram showing the connection structure between the third mounting plate and the parking friction pad.

[0027] Figure 10 This is a diagram showing the connection structure between the third mounting plate and the second drive assembly.

[0028] Figure 11 This is a cross-sectional view showing the connection between the third mounting plate and the second drive assembly.

[0029] Figure 12 This is a cross-sectional view of the second drive component. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without creative effort should be included within the protection scope of the present utility model.

[0031] like Figures 1 to 12 As shown, this embodiment discloses a rear wheel braking structure for a mining car, including a brake disc 1 rotatably connected to the frame. A service brake mechanism 2 for clamping and braking the brake disc 1 during driving and a parking brake mechanism 3 for clamping and braking the brake disc 1 when parking are provided on the outside of the brake disc 1.

[0032] There are two service brake mechanisms 2, which are symmetrically arranged on both sides of the brake disc 1. The parking brake mechanism 3 is arranged between the two service brake mechanisms 2. The two service brake mechanisms 2 and the parking brake mechanism 3 are all fixedly connected to the vehicle frame by bolts.

[0033] The service brake mechanism 2 is provided with a first drive component 4 for driving the service brake mechanism 2 to clamp or release the brake disc, and the parking brake mechanism 3 is provided with a second drive component 5 for driving the parking brake mechanism 3 to clamp or release the brake disc. The first drive component 4 and the second drive component 5 are respectively connected to the hydraulic oil lines provided on the vehicle frame.

[0034] The service braking mechanism 2 is as follows Figures 2 to 5 As shown, it includes a first mounting plate 21, a second mounting plate 22, and a travel friction pad 23. The first mounting plate 21 and the second mounting plate 22 are symmetrically arranged on both sides of the brake disc 1. The first mounting plate 21 or the second mounting plate 22 is fixedly connected to the frame by bolts. The first mounting plate 21 and the second mounting plate 22 are fixedly connected by a first positioning bolt 24. A first spacer sleeve 241 is sleeved on the outer side of the middle of the first positioning bolt 24, and the first spacer sleeve 241 is located between the first mounting plate 21 and the second mounting plate 22. The first mounting plate 21... The relatively close surfaces of the second mounting plate 22 are provided with driving friction pads 23 corresponding to the first mounting plate 21 and the second mounting plate 22. The two driving friction pads 23 are symmetrically arranged on both sides of the brake disc 1 and the driving friction pads 23 can move along the thickness direction of the first mounting plate 21 and the second mounting plate 22. The relatively far surfaces of the first mounting plate 21 and the second mounting plate 22 are fixedly connected with two sets of first drive components 4, and the corresponding driving friction pads 23 are pushed close to the brake disc 1 by the first drive components 4 to perform clamping braking operation.

[0035] When applying the service brake, the first drive assembly on the outer side of the first mounting plate and the second mounting plate is driven to bring the service friction pads on the two mounting plates closer together, thereby squeezing the brake disc located in the middle position to achieve the service brake effect.

[0036] The parking brake mechanism is as follows Figures 8 to 10As shown, it includes a third mounting plate 31, a fourth mounting plate 32, and a parking friction pad 33. The third mounting plate 31 and the fourth mounting plate 32 are symmetrically arranged on both sides of the brake disc 1. The third mounting plate 31 or the fourth mounting plate 32 is fixedly connected to the frame by bolts. The third mounting plate 31 and the fourth mounting plate 32 are fixedly connected by a second positioning bolt 34. A second spacer sleeve 341 is sleeved on the outer side of the middle of the second positioning bolt 34, and the second spacer sleeve 341 is located between the third mounting plate 31 and the fourth mounting plate 32. The relatively close surfaces of the third mounting plate 31 and the fourth mounting plate 32 are both provided with... Parking friction pads 33 are provided corresponding to the third mounting plate 31 and the fourth mounting plate 32. The two parking friction pads 33 are symmetrically arranged on both sides of the brake disc 1 and can move along the thickness direction of the third mounting plate 31 and the fourth mounting plate 32. Two sets of second drive components 5 are fixedly connected to the side of the third mounting plate 31 away from the fourth mounting plate 32. The corresponding parking friction pads 33 are pushed close to the brake disc 1 by the second drive components 5 to perform clamping braking operation. The fourth mounting plate 32 and the corresponding parking friction pads 33 are connected by support bolts 321.

[0037] When the parking brake is applied, the second drive assembly on the outer side of the third mounting plate drives the brake disc, causing the parking friction pads on the third mounting plate to press against the brake disc. Under the pressure, the brake disc moves closer to the parking friction pads on the fourth mounting plate, ultimately achieving the braking effect of the two mounted parking friction pads clamping the brake disc.

[0038] In the service braking mechanism 2, two service guide posts 26 are fixedly connected to the first mounting plate 21 and the second mounting plate 22. The axial direction of the service guide post 26 is consistent with the thickness direction of the first mounting plate 21 and the second mounting plate 22. The two service guide posts 26 are arranged on both sides of the corresponding service friction pads 23. The service friction pads 23 are provided with service guide grooves that are adapted to the service guide posts 26 to cooperate with the service guide posts 26 for guiding operation.

[0039] In the parking brake mechanism 3, two parking guide posts 36 are fixedly connected to both the third mounting plate 31 and the fourth mounting plate 32. The axial direction of the parking guide posts 36 is consistent with the thickness direction of the third mounting plate 31 and the fourth mounting plate 32. The two parking guide posts 36 are arranged on both sides of the corresponding parking friction pads 33. Parking guide grooves that are adapted to the parking guide posts 36 are provided on both sides of the parking friction pads 33 to cooperate with the parking guide posts 36 for guiding operation.

[0040] The guide post guides the movement of the mounting plate and friction pad, ensuring that the friction pad remains parallel to the side wall of the brake disc, allowing it to make contact with the maximum contact surface during braking, thus improving the braking effect of the brake.

[0041] In the service braking mechanism 2, both the first mounting plate 21 and the second mounting plate 22 are provided with service sliding through holes 211, and service return bolts 25 are slidably connected through the service sliding through holes 211. The axial direction of the service return bolts 25 is consistent with the axial direction of the service guide column 26. One end of the service return bolts 25 is fitted with a service return spring 251, and the service return spring 251 is located between the end of the service return bolts 25 and the end face of the first mounting plate 21 or the second mounting plate 22. The other end of the service return bolts 25 passes through the service sliding through holes 211 and is connected to the corresponding service friction pads 23.

[0042] In the parking brake mechanism 3, the third mounting plate 31 and the fourth mounting plate 32 are each provided with a parking sliding through hole 311, and a parking reset bolt 35 is slidably connected through the parking sliding through hole 311. The axial direction of the parking reset bolt 35 is consistent with the axial direction of the parking guide post 36. One end of the parking reset bolt 35 is fitted with a parking reset spring 351, and the parking reset spring 351 is located between the end of the parking reset bolt 35 and the end face of the third mounting plate 31 or the fourth mounting plate 32. The other end of the parking reset bolt 35 passes through the parking sliding through hole 311 and is connected to the corresponding parking friction pad 33.

[0043] The reset bolts and reset springs on the first, second, and third mounting plates are mainly used for the reset operation after the friction pads have squeezed the brake disc. After the hydraulic oil in the first and second drive assemblies flows out, the reset bolts will pull the friction pads away from the brake disc under the action of the reset springs, thus achieving the reset effect of the friction pads. The reset bolts and reset springs on the fourth mounting plate are used to tighten the friction pads after adjusting their position on the fourth mounting plate, preventing them from shaking and affecting the braking effect.

[0044] like Figure 6 , Figure 7As shown, the first drive assembly 4 includes a travel cylinder liner 41, a travel brake piston 43, a push rod 42, a cup body 44, a travel return spring 45, a positioning bushing 422, and a retaining ring 46; the travel cylinder liner 41 is fixedly connected to the first mounting plate 21 or the second mounting plate 22, and the travel brake piston 43 is fitted inside the travel cylinder liner 41 and slidably connected to the travel cylinder liner 41; the travel brake piston 43 is a cylindrical shell with an open top, and the travel... The bottom end of the brake piston 43 passes through the first mounting plate 21 or the second mounting plate 22 and contacts the end face of the travel friction pad 23. A push rod 42 is sleeved on the inner side of the top end of the travel brake piston 43. The top end of the push rod 42 extends out of the outer side of the top end of the travel cylinder sleeve 41 and is fixedly connected to the travel cylinder sleeve 41 by a fastening bolt 421. A positioning bushing 422 is sleeved on the outer side of the push rod 42. The positioning bushing 422 is interference-fitted with the outer wall of the push rod 42 and can move along the axis of the push rod 42. The cup body 44 is sleeved on the outside of the positioning bushing 422. The top of the cup body 44 has an inwardly bent structure 441, which is located at the top of the positioning bushing 422, with its bottom end contacting the top of the positioning bushing 422. The bottom of the cup body 44 has an outwardly bent structure 442, with a travel return spring 45 located at its upper end. The travel return spring 45 is sleeved on the outside of the cup body 44, and its top end... The top of the return spring 45 located inside the service brake piston 43 abuts against the retaining ring 46 that is engaged with the top of the inside of the service brake piston 43; the elastic force of the return spring 45 is less than the frictional force between the positioning bushing 422 and the push rod 42; a hydraulic oil passage 411 is provided inside the service cylinder sleeve 41, one end of the hydraulic oil passage 411 is connected to the top of the inside of the service cylinder sleeve 41, and the other end of the hydraulic oil passage 411 is connected to the hydraulic oil pipeline provided on the frame.

[0045] When the service brake is applied, high-pressure hydraulic oil is supplied to the inside of the service cylinder liner through the hydraulic oil passage. The high-pressure hydraulic oil pushes the service brake piston and retaining ring downward and compresses the service return spring. The service brake piston pushes the service friction pad to compress the brake disc for braking. When the retaining ring contacts the top of the cup, the service friction pad contacts the brake disc, completing the braking of the brake disc. When the brake is released, hydraulic oil flows out of the service cylinder liner. The service brake piston and retaining ring move upward under the elastic action of the service return spring until the service brake piston contacts the bottom end of the positioning bushing, completing the return operation of the service brake piston.

[0046] When the travel friction pads wear out and braking is applied, high-pressure hydraulic oil is supplied to the travel cylinder liner. The travel brake piston moves downward. When the retaining ring contacts the top of the cup, the travel friction pads have not yet contacted the brake disc. The retaining ring, cup, travel brake piston, and the compressed travel return spring continue to move downward. During this movement, the cup pushes the positioning bushing downward until the travel friction pads contact the brake disc and stop. When the brake is released, hydraulic oil flows into the travel cylinder liner. The travel brake piston and retaining ring move upward under the elastic action of the travel return spring and abut against the slid-down positioning bushing. This moves the travel brake piston downward a certain distance from its position when braking is not in operation, keeping the distance between the travel friction pads at the bottom of the travel brake piston and the brake disc constant. This achieves automatic compensation for wear and tear of the travel friction pads.

[0047] like Figure 11 , Figure 12As shown, the second drive assembly 5 includes a parking cylinder liner 51, an end cap 52, a parking brake piston 53, a parking return spring 54, and an adjusting nut 532. The parking cylinder liner 51 is a cylindrical shell with openings at both the top and bottom. The bottom end of the parking cylinder liner 51 is fixedly connected to the third mounting plate 31 by bolts, and the top end of the parking cylinder liner 51 is threadedly connected to the end cap 52. A transverse bolt 521 is provided between the side wall of the end cap 52 and the side of the parking cylinder liner 51, which can prevent the end cap 52 from slipping during brake use. Rotation occurs; the parking brake piston 53 is sleeved inside the parking cylinder sleeve 51 and can slide along the axis of the parking cylinder sleeve 51. The parking brake piston 53 is a cylindrical shell with an open top. The bottom end of the parking brake piston 53 passes through the third mounting plate 31 and contacts the end face of the parking friction pad 33. An adjusting rod 531 is integrally formed at the center of the parking brake piston 53. The bottom end of the adjusting rod 531 is connected to the bottom end of the parking brake piston 53. The top end of the adjusting rod 531 extends from... The center hole on the end cover 52 extends out and is threaded into the adjusting nut 532. A parking return spring 54 is sleeved on the outside of the adjusting rod 531. The bottom end of the parking return spring 54 contacts the bottom end of the parking brake piston 53, and the top end of the parking return spring 54 contacts the inner wall of the end cover 52. A pushing protrusion 533 that increases the outer diameter of the parking brake piston 53 is provided on the outer side of the top end of the parking brake piston 53. A pushing groove that increases the inner diameter of the parking cylinder liner 51 is provided on the upper end of the inner side of the parking cylinder liner 51. The movable protrusion 533 is located in the pushing groove and can slide along the axis of the parking cylinder liner 51 within the pushing groove. A hydraulic cavity 55 is formed between the bottom end of the pushing protrusion 533, the bottom end of the pushing groove, the inner wall of the parking cylinder liner 51, and the outer wall of the parking brake piston 53. The hydraulic cavity 55 is the bottom part of the pushing groove. The hydraulic cavity 55 corresponds to the hydraulic hole 511 provided on the parking cylinder liner 51 and is connected to the hydraulic oil pipeline provided on the frame through the hydraulic hole 511.

[0048] When parking, no high-pressure hydraulic oil is injected into the hydraulic chamber. The parking brake piston, under the action of the parking return spring, pushes the parking friction pad against the brake disc, achieving the parking brake effect. When driving, high-pressure hydraulic oil is injected into the hydraulic chamber through the hydraulic port. The high-pressure hydraulic oil causes the protrusion and the parking brake piston to move upward together, and the parking friction pad leaves the brake disc, allowing the wheel to enter the driving state. When it is necessary to stop, the high-pressure hydraulic oil in the hydraulic chamber is allowed to flow out, and the braking operation on the brake disc is restored under the action of the parking return spring.

[0049] A first sealing washer 27 is provided between the bottom end of the service brake piston 43 and the end of the first mounting plate 21 or the second mounting plate 22 near the service friction pad 23. The first sealing washer 27 is annular in shape, and its outer peripheral edge is fitted into a groove structure on the first mounting plate 21 or the second mounting plate 22. Its inner peripheral edge is fitted into a groove structure on the outer wall of the bottom end of the service brake piston 43. A second sealing washer 37 is provided between the bottom end of the parking brake piston 53 and the end of the third mounting plate 31 near the parking friction pad 33. The second sealing washer 37 is annular in shape, and its outer peripheral edge is fitted into a groove structure on the third mounting plate 31. Its inner peripheral edge is fitted into a groove structure on the outer wall of the bottom end of the parking brake piston 53. Both the first sealing washer 27 and the second sealing washer 37 have a movable allowance to maintain a seal with the mounting plate when the piston moves.

[0050] The sealing gasket ensures a sealed relationship between the piston and the mounting plate, preventing dust from entering the gap between the piston's outer wall, the mounting plate, and the cylinder liner during the mine car's operation. This avoids affecting the piston's normal braking operation and further improves the effectiveness of this invention.

[0051] The service brake mechanism of this invention is in a holding brake state when hydraulic oil is supplied into the first drive assembly, and in a released driving state when hydraulic oil is supplied out of the first drive assembly. This mechanism can brake the wheels during driving. The parking brake mechanism of this invention is in a released driving state when hydraulic oil is supplied into the second drive assembly, and in a holding brake state when hydraulic oil is supplied out of the second drive assembly. This mechanism can brake the wheels when the vehicle is parked. Furthermore, the first drive assembly, through the design of a push rod, positioning bushing, cup body, and service brake piston, can automatically compensate for wear of the service friction pads, ensuring that the distance between the worn service friction pads and the brake disc remains consistent with the distance before wear. This avoids the situation where wear of the service friction pads affects the braking efficiency of the brake, effectively improving the braking safety of the brake and thus improving the safety of vehicle driving. It has excellent market promotion value.

Claims

1. A rear wheel braking structure for a mining car, comprising a brake disc rotatably connected to a frame, a service brake mechanism for clamping and braking the brake disc during driving, and a parking brake mechanism for clamping and braking the brake disc when parked; characterized in that: The vehicle has two service braking mechanisms, which are symmetrically arranged on both sides of the brake disc. The parking brake mechanism is located between the two service braking mechanisms. Both service braking mechanisms and the parking brake mechanism are fixedly connected to the vehicle frame by bolts. The service braking mechanism is equipped with a first drive component for driving the service braking mechanism to clamp or release the brake disc. The parking brake mechanism is equipped with a second drive component for driving the parking brake mechanism to clamp or release the brake disc. The first drive component and the second drive component are respectively connected to hydraulic oil lines provided on the vehicle frame.

2. The mine car rear wheel braking structure as described in claim 1, characterized in that: The service braking mechanism includes a first mounting plate, a second mounting plate, and service friction pads. The first and second mounting plates are symmetrically arranged on both sides of the brake disc. The first or second mounting plate is fixedly connected to the vehicle frame by bolts. The first and second mounting plates are fixedly connected by a first positioning bolt. A first spacer sleeve is sleeved on the outer side of the middle of the first positioning bolt and is located between the first and second mounting plates. Service friction pads corresponding to the first and second mounting plates are provided on the relatively close surfaces of the first and second mounting plates. The two service friction pads are symmetrically arranged on both sides of the brake disc and can move along the thickness direction of the first and second mounting plates. A first drive assembly is fixedly connected to the relatively far surfaces of the first and second mounting plates and pushes the corresponding service friction pads closer to the brake disc to perform clamping braking operation.

3. The mine car rear wheel braking structure as described in claim 2, characterized in that: Two travel guide posts are fixedly connected to both the first mounting plate and the second mounting plate. The axial direction of the travel guide posts is consistent with the thickness direction of the first mounting plate and the second mounting plate. The two travel guide posts are set on both sides of the corresponding travel friction pads. The travel friction pads are provided with travel guide grooves that are adapted to the travel guide posts to cooperate with the travel guide posts for guiding operation.

4. The mine car rear wheel braking structure as described in claim 3, characterized in that: Both the first mounting plate and the second mounting plate are provided with a traveling vehicle sliding through hole, and a traveling vehicle reset bolt is slidably connected through the traveling vehicle sliding through hole. The axial direction of the traveling vehicle reset bolt is consistent with the axial direction of the traveling vehicle guide column. One end of the traveling vehicle reset bolt is fitted with a traveling vehicle reset spring, and the traveling vehicle reset spring is located between the end of the traveling vehicle reset bolt and the end face of the first mounting plate or the second mounting plate. The other end of the traveling vehicle reset bolt passes through the traveling vehicle sliding through hole and is connected to the corresponding traveling vehicle friction pad.

5. The mine car rear wheel braking structure as described in claim 4, characterized in that: The first drive assembly includes a travel cylinder liner, a travel brake piston, a push rod, a cup body, a travel return spring, a positioning bushing, and a retaining ring. The travel cylinder liner is fixedly connected to a first mounting plate or a second mounting plate. The travel brake piston is fitted inside the travel cylinder liner and is slidably connected to the travel cylinder liner. The travel brake piston is a cylindrical shell with an open top. The bottom end of the travel brake piston passes through the first mounting plate or the second mounting plate and contacts the end face of the travel friction pad. A push rod is fitted inside the top of the travel brake piston. The top of the push rod extends out of the outer side of the top of the travel cylinder liner and is fixedly connected to the travel cylinder liner by a fastening bolt. A positioning bushing is fitted outside the push rod. The positioning bushing is interference-fitted with the outer wall of the push rod and can move along the axis of the push rod. Sliding; the cup body is sleeved on the outside of the positioning bushing, and the top of the cup body is provided with an inward bending structure. The inward bending structure is located on the top of the positioning bushing and the bottom end of the inward bending structure is in contact with the top of the positioning bushing. The bottom end of the cup body is provided with an outward bending structure. The upper end of the outward bending structure is provided with a travel return spring, which is sleeved on the outside of the cup body. The top of the travel return spring is located inside the travel brake piston and abuts against the retaining ring that is engaged with the top of the travel brake piston. The elastic force of the travel return spring is less than the frictional force between the positioning bushing and the push rod. The travel cylinder sleeve is provided with a hydraulic oil passage. One end of the hydraulic oil passage is connected to the top of the travel cylinder sleeve, and the other end of the hydraulic oil passage is connected to the hydraulic oil pipeline provided on the frame.

6. The mine car rear wheel braking structure as described in claim 5, characterized in that: The parking brake mechanism includes a third mounting plate, a fourth mounting plate, and parking friction pads. The third and fourth mounting plates are symmetrically arranged on both sides of the brake disc. The third or fourth mounting plate is fixedly connected to the vehicle frame by bolts. The third and fourth mounting plates are fixedly connected to each other by a second positioning bolt. A second spacer is sleeved on the outer side of the middle of the second positioning bolt and is located between the third and fourth mounting plates. Parking friction pads corresponding to the third and fourth mounting plates are provided on the relatively close surfaces of the third and fourth mounting plates. The two parking friction pads are symmetrically arranged on both sides of the brake disc and can move along the thickness direction of the third and fourth mounting plates. A second drive assembly is fixedly connected to the side of the third mounting plate away from the fourth mounting plate. The second drive assembly pushes the corresponding parking friction pad close to the brake disc to perform a clamping braking operation. The fourth mounting plate is connected to the corresponding parking friction pad by a support bolt.

7. The mine car rear wheel braking structure as described in claim 6, characterized in that: Two parking guide posts are fixedly connected to both the third and fourth mounting plates. The axial direction of the parking guide posts is consistent with the thickness direction of the third and fourth mounting plates. The two parking guide posts are set on both sides of the corresponding parking friction pads. Parking guide grooves that are adapted to the parking guide posts are provided on both sides of the parking friction pads to cooperate with the parking guide posts for guiding operation.

8. The mine car rear wheel braking structure as described in claim 7, characterized in that: Both the third and fourth mounting plates are provided with parking sliding through holes, and parking reset bolts are slidably connected through the parking sliding through holes. The axial direction of the parking reset bolt is consistent with the axial direction of the parking guide post. A parking reset spring is sleeved on one end of the parking reset bolt and is located between the end of the parking reset bolt and the end face of the third or fourth mounting plate. The other end of the parking reset bolt passes through the parking sliding through hole and is connected to the corresponding parking friction pad.

9. The mine car rear wheel braking structure as described in claim 8, characterized in that: The second drive assembly includes a parking cylinder liner, an end cover, a parking brake piston, a parking return spring, and an adjusting nut. The parking cylinder liner is a cylindrical shell with openings at both ends. The bottom end of the parking cylinder liner is bolted to a third mounting plate, and the top end of the parking cylinder liner is threaded to the end cover. The parking brake piston is fitted inside the parking cylinder liner and can slide along the axis of the parking cylinder liner. The parking brake piston is a cylindrical shell with an open top. The bottom end of the parking brake piston passes through the third mounting plate and contacts the end face of the parking friction pad. An adjusting rod is integrally formed at the center of the parking brake piston. The bottom end of the adjusting rod is connected to the bottom end of the parking brake piston. The top end of the adjusting rod extends from the center hole on the end cover and is adjusted... The nut is threaded and connected. A parking return spring is sleeved on the outside of the adjusting rod. The bottom end of the parking return spring contacts the bottom end of the parking brake piston, and the top end of the parking return spring contacts the inner wall of the end cover. A push protrusion that increases the outer diameter of the parking brake piston is provided on the outer side of the top end of the parking brake piston. A push groove that increases the inner diameter of the parking cylinder liner is provided on the upper end of the inner side of the parking cylinder liner. The push protrusion is located in the push groove and can slide along the axis of the parking cylinder liner within the push groove. A hydraulic cavity is formed between the bottom end of the push protrusion, the bottom end of the push groove, the inner wall of the parking cylinder liner, and the outer wall of the parking brake piston. The hydraulic cavity corresponds to the hydraulic hole provided on the parking cylinder liner and is connected to the hydraulic oil line provided on the frame through the hydraulic hole.

10. The mine car rear wheel braking structure as described in claim 9, characterized in that: A sealing gasket is provided between the bottom end of the service brake piston and the end of the first or second mounting plate near the service friction pad, or between the bottom end of the parking brake piston and the end of the third mounting plate near the parking friction pad. The sealing gasket is ring-shaped, with its outer periphery fitted and connected to the first, second, or third mounting plate, and its inner periphery fitted and connected to the outer wall of the bottom end of the service brake piston or parking brake piston.

Images