A drum ESP brake

Abstract

The utility model provides a kind of drum ESP brake, including support, support is provided with ESP brake actuator and brake assembly, ESP brake actuator can drive brake assembly to realize braking, brake assembly includes bottom plate, bottom plate is provided with pull arm, ESP brake actuator and pull arm are connected together by pull line, bottom plate is provided with the guiding assembly for the sliding of pull line is guided, guiding assembly includes the slide rail being set on bottom plate, slide rail is provided with sliding block, pull line is set on sliding block.The utility model can be through the guiding of guiding assembly to the sliding of pull line and limiting effect, greatly improve the stability of pull line movement in the process that ESP brake actuator pulls pull line and pulls pull arm to rotate, avoid its direct and hard sliding friction with line slot, reduce its maintenance frequency, improve the service life of pull line and brake.

Description

Technical Field

[0001] This utility model relates to the field of braking equipment technology, specifically to a drum-type ESP brake. Background Technology

[0002] Automobile brakes are the braking devices of automobiles. Almost all automobile brakes are friction type, which can be divided into two main categories: drum brakes and disc brakes. In drum brakes, the rotating element in the friction pair is the brake drum, and its working surface is a cylindrical surface. In disc brakes, the rotating element is the rotating brake disc, with its end face as the working surface.

[0003] With the development of autonomous driving technology, especially the widespread application of unmanned delivery vehicles in the logistics and distribution field, higher requirements have been placed on the reliability, automation level and space utilization of vehicle parking systems.

[0004] Traditional mechanical handbrakes (cable-operated parking brakes) involve the cable sliding directly along the cable slot during braking. This direct sliding friction between the cable and the slot leads to easy aging and wear of the cable, resulting in a short service life and significant safety hazards. Frequent repairs or replacements are required, which in turn increases maintenance costs. Utility Model Content

[0005] In view of this, the present invention provides a drum-type ESP brake. The present invention can achieve sliding guidance and limit of the movement of the cable through the guide component, which solves the problem that in the traditional cable-type parking brake, hard sliding friction is generated directly between the cable and the cable slot during the braking process. This leads to easy aging and wear of the cable, resulting in a short service life and a great safety hazard. It also requires frequent maintenance or replacement, which in turn increases maintenance costs.

[0006] To solve the above-mentioned technical problems, this utility model provides a drum-type ESP brake, including a bracket, on which an ESP brake actuator and a brake assembly are mounted. The ESP brake actuator drives the brake assembly to achieve braking. The brake assembly includes a base plate, on which a pull arm is mounted. The ESP brake actuator and the pull arm are connected by a pull cable. The base plate is provided with a guide assembly for guiding the sliding of the pull cable. The guide assembly includes a slide rail mounted on the base plate, a slider mounted inside the slide rail, and the pull cable mounted on the slider. This utility model, through the guiding and limiting function of the guide assembly on the sliding of the pull cable, greatly improves the stability of the pull cable movement during the rotation of the pull arm by the ESP brake actuator, avoids direct hard sliding friction between the pull cable and the cable slot, greatly extends the service life of the pull cable, reduces the frequency of maintenance, and extends the service life of both the pull cable and the brake.

[0007] The slider is equipped with clamps, including a fixing clamp and a pressing clamp hinged to the fixing clamp. Both the fixing clamp and the pressing clamp have anti-slip sleeves on their inner sides. When the two anti-slip sleeves are engaged, they form an annular cylinder that matches the outer diameter of the pull cable. This invention uses clamps to firmly and stably fasten the inner anti-slip sleeves to the outside of the pull cable, achieving a tight grip on the pull cable and ensuring stability as the pull cable and slider move along the slide rail.

[0008] The clamping and fixing hoops are hinged together at one end via a hinge shaft. Both ends of the clamping and fixing hoops have ear plates with through holes, into which locking elements are inserted. This invention achieves a secure and stable fastening of the clamping and fixing hoops after they are engaged, further enhancing the clamping force on the pull wire after they are engaged.

[0009] The locking mechanism includes a locking bolt inserted into a through hole, with a locking nut threaded onto the bolt. This facilitates easy and efficient disassembly, opening, and fixing of the clamping and fixing clamps, making the process more convenient and efficient.

[0010] The ESP brake actuator includes a fixed frame mounted on a bracket, a drive component mounted on the fixed frame, a worm gear mounted at the end of the output shaft of the drive component, and a worm wheel rotatably mounted on the fixed frame, adapted to the worm gear. A threaded block is mounted on the axis of the worm wheel, and a screw is threadedly connected to the threaded block. The screw passes through the threaded block, and a push rod is mounted at the end of the screw. The end of the push rod is fixed to one end of a pull cable, and the other end of the pull cable is connected to a pull arm. This invention allows the worm gear to rotate by rotating the output shaft of the drive component, which in turn rotates the threaded block. Because the screw is connected to the push rod and the pull cable, its axial movement is constrained but it can still rotate, or its rotation can be restricted by structures such as keyways. When the threaded block rotates, the screw and the threaded block undergo relative helical motion, thereby pushing or pulling the push rod to move linearly along the screw axis, thus enabling the pull cable to pull the pull arm to swing.

[0011] The brake assembly also includes an adjusting arm hinged to the base plate. The adjusting arm has a latch, with one end of a pull cable passing through it and having a locking block at that end larger than the inner diameter of the latch. A return spring is located at the other end of the adjusting arm, and a brake shoe is fixedly attached to the other end of the return spring. This invention allows the pull cable, in conjunction with the locking block, to pull the latch and the adjusting arm along the hinge of the base plate, simultaneously stretching the return spring and pulling the brake shoe outwards to brake the wheel hub. When the pull cable retracts, the restoring force of the return spring pulls the brake shoe inwards to release the brake from the wheel hub.

[0012] The mounting bracket is detachably mounted on the support using fastening bolts. This facilitates quick disassembly and installation of the ESP brake actuator, greatly improving maintenance efficiency.

[0013] The driving component is a motor or electric motor.

[0014] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects: 1. By setting up a guide assembly consisting of a slide rail and a slider, the movement of the cable is transformed from direct, rigid sliding contact friction with the base plate groove to guided sliding of the slider along the inner wall of the slide rail. The slide rail provides rigid constraint and precise guidance for the slider's sliding path, effectively eliminating radial sway and jitter of the cable during movement, ensuring the linearity and smoothness of the cable's tension and return movements. This allows the tension output by the ESP brake actuator to be transmitted to the brake arm more precisely and linearly, greatly improving the accuracy and response speed of braking force application when the ESP system intervenes, thereby enhancing the effectiveness of vehicle stability control.

[0015] 2. The introduction of the guide assembly avoids direct, hard friction between the metal surface of the cable and the metal base plate. Simultaneously, the anti-slip sleeve inside the clamp, while holding the cable securely, also provides cushioning and isolation, further protecting the cable sheath. These measures work together to significantly reduce the wear rate of the cable, decrease malfunctions caused by cable wear and breakage, and extend the maintenance cycle and service life of the cable and the entire braking system.

[0016] 3. A clamping structure consisting of a fixing clamp, a compression clamp, a hinge shaft, and locking bolts / nuts is adopted to achieve quick and secure clamping of the guy cable. The anti-slip sleeve increases the static friction between the guy cable and the clamp, preventing relative slippage under frequent alternating loads. This fixing method provides high connection strength and good stability, ensuring reliable and delay-free power transmission between the guy cable, actuator, and brake under the high-intensity, high-frequency braking conditions of the ESP system, thus improving the overall reliability and safety of the system.

[0017] 4. The overall structural design is reasonable. The ESP brake actuator is independently mounted on the bracket via fastening bolts, achieving modular separation from the brake assembly. When the actuator needs maintenance or replacement, only the fastening bolts and the clamp connection at the end of the cable need to be removed, without disassembling the entire brake assembly, making maintenance simple and quick. Similarly, the slider, clamp, and even the entire slide rail in the guide assembly can be replaced independently, greatly improving the convenience and efficiency of maintenance and reducing operating costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the drum-type ESP brake of this utility model; Figure 2 This is a front view of the drum-type ESP brake of this utility model; Figure 3 This utility model Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the guide assembly in the drum-type ESP brake of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 100, bracket; 200, ESP brake actuator; 210, fixed frame; 220, drive component; 230, push rod; 300, brake assembly; 310, base plate; 320, pull arm; 330, adjusting arm; 331, buckle; 340, return spring; 350, brake shoe; 400, pull cable; 410, locking block; 500, guide assembly; 510, slide rail; 520, slider; 530, clamp; 531, fixing clamp; 532, pressure clamp; 533, ear plate; 540, anti-slip sleeve; 600, locking component; 610, locking bolt. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-4 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0021] like Figure 1-4 As shown: This embodiment provides a drum-type ESP brake, including a bracket 100. The bracket 100 serves as the basic load-bearing component of the entire device and is typically formed by stamping high-strength steel plates or welding shaped steel sections. It is fixed to the vehicle chassis or axle by bolts. The bracket 100 is equipped with an ESP brake actuator 200 and a brake assembly 300. The ESP brake actuator 200 can drive the brake assembly 300 to achieve braking. The brake assembly 300 includes a base plate 310, which is integrally formed from cast iron through a casting process, possessing sufficient structural strength and wear resistance. It is fixedly connected to the bracket 100 at the corresponding position by bolts. A pull arm 320 is provided on the base plate 310. The ESP brake actuator 200 is connected to the pull arm 320 by a pull cable 400. A guide assembly 500 is provided on the base plate 310 to guide the sliding of the pull cable 400. The guide assembly 500 includes a slide rail 510 provided on the base plate 310, a slider 520 provided inside the slide rail 510, and the pull cable 400 is provided on the slider 520.

[0022] The guide rail 510 of the guide assembly 500 is made of metal sheet stamped and bent into a U-shaped or C-shaped groove, and is firmly fixed to a specific position on the base plate 310 by welding or bolting. Its installation direction is consistent with the ideal movement path of the pull cable 400. The slider 520 is made of engineering plastic with self-lubricating properties, such as polyoxymethylene (POM) or nylon PA66, and is formed by injection molding. Its shape matches the inner cavity of the guide rail 510, allowing it to slide smoothly within it.

[0023] This invention can greatly improve the stability of the pull cable 400's movement during the rotation of the ESP brake actuator 200 pulling the pull cable 400 and driving the pull arm 320 by guiding and limiting the sliding of the pull cable 400 through the guide component 500. It avoids hard sliding friction between the pull cable 400 and the cable slot, greatly improves the service life of the pull cable 400, reduces the frequency of maintenance, and extends the service life of both the pull cable 400 and the brake.

[0024] According to one embodiment of the present invention, such as Figure 1 and Figure 4 As shown, a clamp 530 is provided on the slider 520. The clamp 530 includes a fixing clamp 531 and a clamping clamp 532 hinged to the fixing clamp 531. Anti-slip sleeves 540 are provided on the inner sides of both the fixing clamp 531 and the clamping clamp 532. Multiple anti-slip protrusions are provided inside the anti-slip sleeves 540. When the two anti-slip sleeves 540 are fastened together, they form an annular cylinder that matches the outer diameter of the pull wire 400. One end of the clamping clamp 532 and the fixing clamp 531 are hinged together via a hinge shaft. The other end of both the clamping clamp 532 and the fixing clamp 531 is provided with an ear plate 533. Both ear plates 533 have through holes into which locking elements 600 are inserted. The fixing clamp 531 of the clamp 530 can be fixed to the slider 520 by bolt connection, welding, or integral injection molding with the slider 520. The main bodies of the fixing clamp 531 and the clamping clamp 532 are formed by stamping from steel sheet. The hinge shaft is a steel pin that hinges one end of the clamping band 532 to the fixing band 531, allowing the clamping band 532 to open and close around it. Two anti-slip sleeves 540 are made of highly elastic, highly wear-resistant rubber, such as nitrile rubber (NBR) or polyurethane, through a molding process, and are respectively embedded in the inner grooves of the fixing band 531 and the clamping band 532 by adhesive bonding or interference fit. The locking bolt 610 and locking nut are standard parts, passing through the through holes of the two ear plates 533 for fastening. When the nuts are tightened, the clamping band 532 is pulled towards the fixing band 531, forcing the two anti-slip sleeves 540 to undergo elastic deformation, thereby tightly gripping the passing pull wire 400 and generating a large static friction force. This utility model can securely and stably fasten the anti-slip sleeve 540 inside to the outside of the pull line 400 through the clamp 530, thereby achieving the tight gripping of the pull line 400 and the stable performance of moving the pull line 400 and the slider 520 along the slide rail 510.

[0025] like Figure 4 As shown, the locking component 600 includes a locking bolt 610 inserted into a through hole, and a locking nut is threaded onto the locking bolt 610. This facilitates easy and efficient disassembly, opening, and fixing of the clamping clamp 532 and the fixing clamp 531, making the process more convenient and efficient.

[0026] like Figure 1 and Figure 2 As shown, the ESP brake actuator 200 includes a fixed frame 210 mounted on a bracket 100. A drive member 220 is mounted on the fixed frame 210. A worm gear is mounted at the end of the output shaft of the drive member 220. A worm wheel adapted to the worm gear is also rotatably mounted on the fixed frame 210. A threaded block is mounted on the axis of the worm wheel. A screw is threadedly connected to the threaded block. The screw passes through the threaded block. A push rod 230 is mounted at the end of the screw. The end of the push rod 230 is fixed to one end of a pull cable 400. The other end of the pull cable 400 is connected to a pull arm 320.

[0027] The mounting bracket 210 is made of bent and welded metal sheet or cast aluminum alloy, and is installed in the reserved position of the bracket 100 by several fastening bolts, realizing modular and detachable installation. The mounting bracket 210 forms a relatively enclosed transmission space. The drive component 220 is the power source, which can be a motor or electric motor. When the drive component 220 is a servo motor, a Delta Electronics ECMA series servo motor can be used. This motor has high response speed, high control precision, and good reliability, and can receive commands from the vehicle's ESP control unit for precise forward and reverse rotation control. The motor's output shaft is fixed to the worm gear via a key connection or interference fit. The worm gear and worm wheel form a first-stage reduction and torque amplification mechanism, with the worm wheel supported on the mounting bracket 210 by bearings. The center hole of the worm wheel is connected by a spline, and the threaded block is usually made of copper alloy or stainless steel to reduce friction. The screw is usually made of high-strength alloy steel, and its surface can be hardened, forming a helical transmission pair with the threaded block. One end of the screw is fixedly connected to the push rod 230. The end of the top rod 230 is provided with a connector for reliably connecting to one end of the pull wire 400, for example, by crimping, riveting or connecting via a threaded joint.

[0028] This invention utilizes the rotation of the output shaft of the drive component 220 to drive the worm gear, which in turn rotates the threaded block. Because the screw is connected to the push rod 230 and the pull wire 400, its axial movement is constrained but it can still rotate, or its rotation is restricted by structures such as keyways. When the threaded block rotates, the screw and the threaded block undergo relative helical motion, thereby pushing or pulling the push rod 230 to move linearly along the screw axis, thus enabling the pull wire 400 to pull the pull arm 320 to swing.

[0029] According to another embodiment of the present invention, such as Figure 3 As shown, the brake assembly 300 also includes an adjusting arm 330 hinged to the base plate 310. The adjusting arm 330 is also equipped with a latch 331. The end of the pull cable 400 passes through the latch 331 and has a locking block 410 larger than the inner diameter of the latch 331 at its end. A return spring 340 is provided at the other end of the adjusting arm 330, and a brake shoe 350 is fixedly mounted at the other end of the return spring 340. Both the pull arm 320 and the adjusting arm 330 are hinged to the base plate 310 by pins and can swing around the hinge point. The latch 331 is welded or riveted to the adjusting arm 330. One end of the return spring 340 is hooked onto the spring seat of the adjusting arm 330, and the other end is connected to the brake shoe 350. The brake shoe 350 is normally kept in a retracted state under the action of the return spring 340. The pull cable 400 is made of high-carbon steel wire rope with an outer polymer protective layer, possessing high tensile strength and a certain degree of flexibility. The end of the pull cable 400 passes through the buckle 331 on the adjusting arm 330 and is fixed by a metal block 410. Since the size of the block 410 is larger than the hole diameter of the buckle 331, a limiting connection is formed. This utility model can use the pull cable 400 and the block 410 to pull the buckle 331 and the adjusting arm 330 to swing along the hinge part of the base plate 310, thereby stretching the return spring 340 and pulling the brake shoe 350 outward to achieve the braking operation of the wheel hub. When the pull cable 400 retracts, the restoring force of the return spring 340 pulls the brake shoe 350 inward to achieve the release operation of the wheel hub.

[0030] The mounting bracket 210 is detachably mounted on the bracket 100 by fastening bolts. This facilitates the quick disassembly and installation of the ESP brake actuator 200, greatly improving maintenance efficiency.

[0031] Working principle and usage of this utility model: First, it needs to be clarified that the drum ESP brake involved in this utility model is mainly used for cable-operated 400-type stable braking of vehicle wheel hubs. The drum ESP brake can be selected from existing complete braking equipment, such as the ESP brake of model MGU-13V produced by Zhejiang Zhongchi Auto Parts Co., Ltd. Since the core modification of this application is to reduce the friction and wear of the cable during the operation of the brake, only the function and structure of the drive component will be described in detail, without going into too much detail about the braking principle of the brake. This utility model takes the braking of unmanned express delivery vehicles in the logistics and distribution field as an example to explain its working principle and usage method in detail. When the vehicle ESP system determines that it is necessary to brake the wheel equipped with this brake, the control unit sends a command to the servo motor of the ESP brake actuator 200.

[0032] Braking process: The servo motor rotates in a specified direction, such as forward, driving the worm gear to rotate. The worm gear drives the worm wheel meshing with it to rotate, which in turn drives the threaded block coaxial with the worm wheel to rotate. Since the screw cannot rotate freely due to the constraint of the push rod 230 and subsequent mechanisms, according to the principle of screw transmission, the screw generates linear motion along its axis under the action of the rotating threaded block, pushing it outward. The screw pushes the push rod 230, and the push rod 230 pulls the pull cable 400 fixed to it. The pull cable 400 drives the slider 520 through the clamp 530, and the slider 520 slides smoothly in a straight line along the slide rail 510 fixed on the base plate 310. The other end of the pull cable 400 pulls the buckle 331 on the adjusting arm 330 through the clamp 410, so that the adjusting arm 330 overcomes the tension of the return spring 340 and swings in a certain direction around its hinge point. The swing of the adjusting arm 330 pulls the return spring 340, which in turn pushes the brake shoe 350 connected to it outward and presses it against the inner wall of the wheel hub, generating braking torque and achieving braking.

[0033] Release Process: When the ESP system commands the brakes to be released, the servo motor rotates in the reverse direction. Through the reverse action of the aforementioned transmission chain, the screw drives the push rod 230 to retract, releasing the tension on the pull cable 400. At this time, the stretched return spring 340 releases its elastic potential energy, pulling the adjusting arm 330 to swing back and reset, thereby pulling the brake shoe 350 away from the wheel hub, releasing the brakes. Simultaneously, the force of the return spring 340 also assists the pull cable 400 and the slider 520 to slide back and reset within the slide rail 510 through the adjusting arm 330, the locking block 410, and the pull cable 400.

[0034] Throughout the process, the guide assembly 500 ensures the linearity and stability of the cable 400's movement, and the clamp 530 ensures the firmness of the connection between the cable 400 and the slider 520, thereby enabling the rapid, accurate, and reliable execution of ESP braking commands.

[0035] This invention uses the guide component 500 to slide and limit the movement of the pull cable 400, solving the problem that in traditional pull cable parking systems, the pull cable 400 is prone to aging and wear during braking due to the hard sliding friction between it and the cable slot, resulting in a short service life, significant safety hazards, and the need for frequent maintenance or replacement, which in turn increases maintenance costs.

[0036] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A drum-type ESP brake, characterized in that: The system includes a bracket (100), on which an ESP brake actuator (200) and a brake assembly (300) are mounted. The ESP brake actuator (200) can drive the brake assembly (300) to achieve braking. The brake assembly (300) includes a base plate (310), on which a pull arm (320) is mounted. The ESP brake actuator (200) and the pull arm (320) are connected together by a pull wire (400). The base plate (310) is provided with a guide assembly (500) for guiding the sliding of the pull wire (400). The guide assembly (500) includes a slide rail (510) mounted on the base plate (310), and a slider (520) is mounted inside the slide rail (510). The pull wire (400) is mounted on the slider (520).

2. The drum-type ESP brake as described in claim 1, characterized in that: The slider (520) is provided with a clamp (530), which includes a fixing clamp (531) and a clamping clamp (532) hinged on the fixing clamp (531). The inner sides of the fixing clamp (531) and the clamping clamp (532) are provided with anti-slip sleeves (540). When the two anti-slip sleeves (540) are fastened together, they form an annular cylinder that matches the outer diameter of the pull wire (400).

3. The drum-type ESP brake as described in claim 2, characterized in that: One end of the clamping hoop (532) and the fixing hoop (531) are hinged together by a hinge shaft. The other end of the clamping hoop (532) and the fixing hoop (531) are provided with ear plates (533). Both ear plates (533) have through holes, and locking elements (600) are inserted into the through holes.

4. The drum-type ESP brake as described in claim 3, characterized in that: The locking component (600) includes a locking bolt (610) inserted into a through hole, and a locking nut is threaded onto the locking bolt (610).

5. The drum-type ESP brake as described in claim 1, characterized in that: The ESP brake actuator (200) includes a fixed frame (210) mounted on a bracket (100). A drive member (220) is mounted on the fixed frame (210). A worm gear is mounted at the end of the output shaft of the drive member (220). A worm wheel adapted to the worm gear is also rotatably mounted on the fixed frame (210). A threaded block is mounted on the axis of the worm wheel. A screw is threaded onto the threaded block. The screw passes through the threaded block. A push rod (230) is mounted at the end of the screw. The end of the push rod (230) is fixed together with one end of a pull wire (400). The other end of the pull wire (400) is connected to a pull arm (320).

6. The drum-type ESP brake as described in claim 1, characterized in that: The brake assembly (300) further includes an adjusting arm (330) hinged to the base plate (310), and a buckle (331) is provided on the adjusting arm (330). The end of the pull cable (400) passes through the buckle (331) and is provided with a locking block (410) larger than the inner diameter of the buckle (331). The other end of the adjusting arm (330) is provided with a return spring (340), and the other end of the return spring (340) is fixedly provided with a brake shoe (350).

7. The drum-type ESP brake as described in claim 5, characterized in that: The fixing frame (210) is detachably mounted on the bracket (100) by fastening bolts.

8. The drum-type ESP brake as described in claim 7, characterized in that: The driving component (220) is a motor or electric motor.

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