A safety brake drum brake device

Abstract

The present invention discloses a safety drum brake device, which relates to the technical field of automobile brakes. The present invention comprises a chassis; a pair of brake shoes are symmetrically arranged on the inner end surface of the chassis; friction leathers are fixed to the opposite outer sides of the two brake shoes; a driving assembly is installed on the inner end surface of the chassis; the driving assembly is installed between the two brake shoes; the driving assembly comprises a pair of hydraulic cylinders fixed side by side on the inner end surface of the chassis; first movable blocks are fixed to the two output ends of the hydraulic cylinders; mounting plates are arranged on the opposite outer sides of the two hydraulic cylinders; the two mounting plates are respectively fixed to the opposite inner sides of the two brake shoes; the mounting plates are connected to the first movable blocks on the hydraulic cylinders through the first movable block and the mounting plate. The present invention drives the brake shoes equipped with friction leathers to approach and fit the brake drum through the hydraulic cylinder via the first movable block and the mounting plate, thereby achieving the purpose of safe braking, and has a high market application value.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile braking, and in particular relates to a safety brake drum device. Background Art

[0002] Drum brakes have been used on cars for nearly a century, but due to their reliability and strong braking force, they are still installed on many models today. They are fixed to the tire and rotate at the same speed. When braking, oil pressure is used to push the brake shoe to contact the inner edge of the brake drum. The friction generated by the contact suppresses the rotation of the tire to achieve the purpose of braking. Drum brakes are composed of brake base plates, brake cylinders, brake shoes and other related connecting rods, springs, pins, and brake drums. They are generally installed on the rear wheels. Drum brakes have lower costs and higher absolute braking force. The inner surface of the brake drum of the drum brake is where the brake device generates braking torque.

[0003] The Chinese patent with the authorization announcement number CN109667856B discloses a bidirectional high-efficiency heat dissipation drum brake device, which pushes the piston to move to both sides through the hydraulic cylinder, thereby pushing the outer connecting plate to move outward through the push rod, and the outer connecting plate drives the outer brake shoe to move synchronously when the outer brake shoe moves, and the outer brake shoe contacts the inner wall of the brake drum when the hydraulic cylinder works, so that the braking process is realized under the action of the outer brake shoe and the brake drum and the inner brake shoe and the inner brake sleeve. Although it can achieve braking to a certain extent, since the hydraulic cylinder and the outer connecting plate (or the inner connecting plate) are only connected by the push rod, the force of the outer connecting plate (or the inner connecting plate) from the hydraulic cylinder is too concentrated, resulting in a small force at both ends of the outer brake shoe (or the inner brake shoe) on the inner wall of the brake drum (or the outer wall of the inner brake sleeve), thereby reducing the braking effect and easily causing problems such as brake failure. Therefore, it is urgent to study a safe brake drum brake device to solve the above problems. Summary of the invention

[0004] The present invention provides a safe brake drum brake device, the purpose of which is to solve the technical problems in the prior art proposed in the above background technology that the force from the hydraulic cylinder is too concentrated, resulting in a small force on the brake drum at both ends of the brake shoe, thereby causing poor braking effect.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a safety drum brake device, comprising a chassis; a pair of brake shoes are symmetrically arranged on the inner end surface of the chassis; friction leathers are fixed to the opposite outer sides of the two brake shoes; a driving assembly is installed on the inner end surface of the chassis; the driving assembly is installed between the two brake shoes; the driving assembly comprises a pair of hydraulic cylinders fixed side by side on the inner end surface of the chassis; first movable blocks are fixed to the two output ends of the hydraulic cylinders; mounting plates are arranged on the opposite outer sides of the two hydraulic cylinders; the two mounting plates are respectively fixed to the opposite inner sides of the two brake shoes; the mounting plate is connected to the first movable block on the hydraulic cylinder through a first transmission rod.

[0007] As a preferred technical solution of the present invention, the mounting plate is provided with positioning grooves in parallel at an edge away from the brake shoe; a guide block is slidably connected in the positioning groove; and the guide block is fixed to the inner end surface of the chassis.

[0008] As a preferred technical solution of the present invention, the two brake shoes are connected via a pair of return springs; the two return springs are arranged on opposite sides of the driving assembly.

[0009] As a preferred technical solution of the present invention, a cooling component is installed on the inner end surface of the chassis; the cooling component includes a pair of liquid storage cylinders fixed side by side on the inner end surface of the chassis; a pair of symmetrically arranged push plates are slidably installed in the liquid storage cylinders; a first infusion tube is connected to the middle of the liquid storage cylinder; and a nozzle is connected to one end of the first infusion tube.

[0010] As a preferred technical solution of the present invention, the middle parts of the two liquid storage cylinders are connected to a second infusion tube; the two second infusion tubes are connected to a liquid inlet valve; and the liquid inlet valve is connected to a liquid supply tube.

[0011] As a preferred technical solution of the present invention, the movement direction of the push plate is arranged perpendicular to the movement direction of the output end of the hydraulic cylinder; the relative outer sides of the two push plates in the liquid storage cylinder are vertically fixed with driving columns; the separated ends of the two driving columns pass through the liquid storage cylinder and are fixed with a second movable block corresponding to the first movable block; the second movable block is connected to the first movable block by a second transmission rod.

[0012] The present invention has the following beneficial effects:

[0013] The present invention drives the two first movable blocks thereon to move away from each other through a hydraulic cylinder, and drives the mounting plate to move through a first transmission rod, thereby prompting the brake shoe to drive the friction skin to approach and abut against the inner wall of the brake drum, thereby achieving the purpose of braking. Due to the use of a two-point transmission structure, the contact effect of the brake shoe on the friction skin and the brake drum can be effectively improved, thereby improving the braking effect, avoiding the occurrence of problems such as brake failure, and having a high market application value.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 The present invention is a schematic structural diagram of a safety drum brake device.

[0017] Figure 2 for Figure 1 Top view of the structure.

[0018] Figure 3 It is a schematic diagram of the structure of the driving assembly of the present invention.

[0019] Figure 4 for Figure 3 Top view of the structure.

[0020] Figure 5 It is a schematic structural diagram of the cooling component of the present invention.

[0021] Figure 6 for Figure 5 Top view of the structure.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0023] 1-chassis, 2-brake shoe, 3-friction leather, 4-driving assembly, 5-reset spring, 6-cooling assembly, 401-hydraulic cylinder, 402-first movable block, 403-mounting plate, 404-first transmission rod, 405-guide block, 601-liquid storage cylinder, 602-push plate, 603-first liquid infusion tube, 604-nozzle, 605-second liquid infusion tube, 606-liquid inlet valve, 607-liquid supply tube, 7-driving column, 701-second movable block, 702-second transmission rod, 4041-positioning groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific embodiment one:

[0026] See also Figure 1-Figure 4 As shown, the present invention is a safety brake drum brake device, including a chassis 1, a brake drum and a wheel mounting plate; the installation method between the chassis 1, the brake drum and the wheel mounting plate belongs to the conventional design in this field and is not repeated here; a pair of brake shoes 2 with an arc-shaped structure are symmetrically arranged on the inner end surface of the chassis 1; a friction skin 3 with an arc-shaped structure is fixed to the opposite outer side surfaces of the two brake shoes 2; a driving component 4 is installed on the inner end surface of the chassis 1; the driving component 4 is installed between the two brake shoes 2; the driving component 4 includes a pair of hydraulic cylinders 401 fixed side by side on the inner end surface of the chassis 1; the two hydraulic cylinders 401 correspond to the two brake shoes 2 one by one; the hydraulic cylinder 401 is a conventional bidirectional hydraulic cylinder in this field; both output ends of the hydraulic cylinder 401 are screw The nail is connected with the first movable block 402; the relative outer sides of the two hydraulic cylinders 401 are each provided with a mounting plate 403 with an arc-shaped structure; the two mounting plates 403 are respectively welded to the relative inner sides of the two brake shoes 2; the mounting plate 403 and the first movable block 402 on the hydraulic cylinder 401 are connected through the first transmission rod 404; the first transmission rod 404 is rotationally matched with the mounting plate 403 and the first movable block 402; the distance between the connection point between the mounting plate 403 and the two first transmission rods 404 is greater than the distance between the two first movable blocks 402 on the hydraulic cylinder 401; an "eight"-shaped structure is formed between the two first transmission rods 404 on the mounting plate 403, and the shrinking end of the "eight"-shaped structure is close to the hydraulic cylinder 401. When in use, the hydraulic cylinder 401 drives the two first movable blocks 402 thereon to move away from each other, and the first transmission rod 404 drives the mounting plate 403 to move, thereby prompting the brake shoe 2 to drive the friction skin 3 to approach and abut against the inner wall of the brake drum, thereby achieving the purpose of braking. Due to the use of a two-point transmission structure, the contact effect of the brake shoe 2 on the friction skin 3 and the brake drum can be effectively improved, thereby improving the braking effect and avoiding the occurrence of problems such as brake failure.

[0027] Among them Figure 3-Figure 4 As shown, positioning grooves 4041 are arranged side by side on an edge of the mounting plate 403 away from the brake shoe 2; a guide block 405 is slidably connected in the positioning groove 4041; the guide block 405 is fixed on the inner end surface of the chassis 1; and the guide block 405 is arranged on the inner side of the two first transmission rods 404. By arranging positioning grooves 4041 side by side on an edge of the mounting plate 403 away from the brake shoe 2, the guide block 405 is slidably connected in the positioning groove 4041, and the guide block 405 is fixed on the inner end surface of the chassis 1, the movement stability of the mounting plate 403 can be effectively guaranteed, thereby ensuring the braking effect.

[0028] Among them Figure 3-Figure 4As shown, the two brake shoes 2 are connected by a pair of return springs 5; the two return springs 5 ​​are arranged on opposite sides of the driving assembly 4; the ends of the return springs 5 ​​are fixedly connected to the ends of the brake shoes 2. By arranging the return springs 5, the return speed of the brake shoes 2 can be increased, thereby accelerating the separation rate of the friction skin 3 and the brake drum, thereby ensuring the use effect of the entire device. Specific embodiment 2:

[0030] Based on the specific embodiment 1, the difference of this embodiment is that:

[0031] like Figure 1-Figure 2 and Figure 5-Figure 6 As shown, a cooling component 6 is installed on the inner end surface of the chassis 1; the cooling component 6 includes a pair of liquid storage cylinders 601 fixed side by side on the inner end surface of the chassis 1; the liquid storage cylinder 601 is a cylindrical structure; the liquid storage cylinder 601 has a closed inner cavity structure, and the inner cavity structure can store coolant; a pair of symmetrically arranged push plates 602 are slidably installed in the inner cavity structure of the liquid storage cylinder 601; the two push plates 602 are symmetrically arranged about the middle of the liquid storage cylinder 601; a pair of first infusion pipes 603 are connected to the middle of the liquid storage cylinder 601; one end of the first infusion pipe 603 is connected to a nozzle 604; the nozzle 604 is a conventional atomizing nozzle in the art; the nozzle of the nozzle 604 points to the brake shoe 2, and the spray direction of the brake shoe 2 is perpendicular to the movement direction of the output end of the hydraulic cylinder 401. When the friction leather 3 is close to the brake drum, the two push plates 602 move closer to each other, thereby pushing the coolant in the liquid reservoir 601 to the nozzle 604 through the first liquid delivery pipe 603. The nozzle 604 sprays the coolant, thereby effectively reducing the temperature of the brake shoe 2, the friction leather 3 and the chassis 1, avoiding problems such as overheating and failure of the brake due to long-term braking.

[0032] Among them Figure 5-Figure 6 As shown, the middle of the two liquid storage cylinders 601 are connected with a second liquid infusion tube 605; the two second liquid infusion tubes 605 are connected to a liquid inlet valve 606; the liquid inlet valve 606 is connected with a liquid supply tube 607; the liquid inlet valve 606 adopts a conventional one-inlet and two-outlet valve in the art; one end of the liquid supply tube 607 is connected to a liquid supply source; the liquid supply source is composed of a liquid supply pump and a liquid storage tank; the liquid supply source is installed in the engine room of the car. When in use, after the two push plates 602 in the liquid storage cylinder 601 are reset, the coolant is promptly added to the liquid storage cylinder 601 through the liquid supply tube 607, the liquid inlet valve 606 and the second liquid infusion tube 605, thereby ensuring continuous cooling of the inside of the chassis 1. Specific embodiment three:

[0034] Based on the second specific embodiment, the difference of this embodiment is that:

[0035] like Figure 5-Figure 6As shown, the movement direction of the push plate 602 is perpendicular to the movement direction of the output end of the hydraulic cylinder 401; the opposite outer sides of the two push plates 602 in the liquid storage cylinder 601 are vertically fixed with driving columns 7; the separated ends of the two driving columns 7 are both passed through the liquid storage cylinder 601 and are screwed with the second movable block 701 corresponding to the first movable block 402; the second movable block 701 is connected to the first movable block 402 through the second transmission rod 702; the second transmission rod 702 is rotationally matched with the first movable block 402 and the second movable block 701. When the output end of the hydraulic cylinder 401 is extended, the first movable block 402 transmits the movement to the push plate 602 through the second transmission rod 702, the second movable block 701 and the driving column 7, thereby realizing the synchronous cooling operation during braking, effectively ensuring the cooling effect on the friction skin 3 and the inside of the chassis 1.

[0036] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A safety drum brake device, comprising a chassis (1); a pair of brake shoes (2) are symmetrically arranged on the inner end surface of the chassis (1); friction skins (3) are fixed to the opposite outer sides of the two brake shoes (2); the characteristics are: The inner end surface of the chassis (1) is provided with a driving assembly (4); the driving assembly (4) is provided between the two brake shoes (2); the driving assembly (4) comprises a pair of hydraulic cylinders (401) fixed side by side on the inner end surface of the chassis (1); both output ends of the hydraulic cylinders (401) are fixed with first movable blocks (402); mounting plates (403) are provided on the opposite outer sides of the two hydraulic cylinders (401); the two mounting plates (403) are respectively fixed on the opposite inner side surfaces of the two brake shoes (2); the mounting plates (403) are connected to the first movable blocks (402) on the hydraulic cylinders (401) via a first transmission rod (404); A cooling component (6) is installed on the inner end surface of the chassis (1); the cooling component (6) comprises a pair of liquid storage cylinders (601) fixed side by side on the inner end surface of the chassis (1); a pair of symmetrically arranged push plates (602) are slidably installed in the liquid storage cylinders (601); the movement direction of the push plates (602) is arranged perpendicular to the movement direction of the output end of the hydraulic cylinder (401); a first liquid infusion tube (603) is connected to the middle of the liquid storage cylinder (601); one end of the first liquid infusion tube (603) is connected to a nozzle (604); the middle of the two liquid storage cylinders (601) are both connected to a first liquid infusion tube (603); two infusion tubes (605); the two second infusion tubes (605) are connected to a liquid inlet valve (606); the liquid inlet valve (606) is connected to a liquid supply tube (607); driving columns (7) are vertically fixed to the opposite outer sides of the two push plates (602) in the liquid storage cylinder (601); the separated ends of the two driving columns (7) pass through the liquid storage cylinder (601) and are fixed with a second movable block (701) corresponding to the first movable block (402); the second movable block (701) is connected to the first movable block (402) via a second transmission rod (702).

2. A safety drum brake device according to claim 1, characterized in that: The mounting plate (403) is provided with positioning grooves (4041) in parallel at an edge away from the brake shoe (2); a guide block (405) is slidably connected in the positioning groove (4041); and the guide block (405) is fixed to the inner end surface of the chassis (1).

3. A safety drum brake device according to claim 1 or 2, characterized in that: The two brake shoes (2) are connected via a pair of return springs (5); the two return springs (5) are arranged on opposite sides of the drive assembly (4).

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