Inhaul cable type electronic parking brake with inhaul cable easy to disassemble

Abstract

The utility model relates to the field of brakes, and discloses an inhaul cable type electronic parking brake with an inhaul cable easy to disassemble, which comprises an inhaul cable assembly and a box body, a driving device is arranged in the box body, the output end of the driving device is in transmission connection with a transmission gear pair, and the driving device drives the transmission gear pair to rotate. The transmission gear pair is in transmission connection with the inhaul cable assembly through the screw rod, the transmission gear pair is installed in the box body in a limited mode, the screw rod is sleeved with the transmission gear pair, the transmission gear pair is matched with the screw rod and drives the screw rod to move axially, a working groove for the screw rod to move axially is formed in the box body, and the axis of the working groove and the axis of the screw rod are located on the same straight line; a connector is arranged at the end of the inhaul cable assembly, the end of the threaded rod is detachably connected with the connector, and when the threaded rod and the inhaul cable assembly are assembled, the inhaul cable assembly synchronously and axially moves along with the threaded rod. According to the MGU, the inhaul cable assembly and the screw which are detachably connected are adopted, so that the MGU can be quickly assembled and is convenient to maintain and replace, the whole parking brake does not need to be replaced, only the inhaul cable assembly needs to be replaced, and therefore the maintenance cost and the rejection rate are reduced.

Description

Technical Field

[0001] The utility model relates to the field of brakes, in particular to a cable-type electronic parking brake with an easily detachable cable. Background Art

[0002] Existing cable-type electronic parking brakes (EPBs) generally use riveting to securely connect a cable to a screw rod or a cable to a nut. Although this connection method is simple and easy to use, it has many drawbacks in practical applications.

[0003] First of all, as the core component of EPB, the cable is responsible for transmitting the braking force, making it the most easily worn component in the electronic parking brake system. Once the cable is damaged, the entire EPB assembly needs to be replaced, resulting in a significant increase in maintenance costs.

[0004] Secondly, the existing technology lacks an optimized design for the contact point between the nut and the screw head. When the EPB reaches its maximum stroke, the screw directly contacts the flat surface of the nut, which can easily cause jamming, seriously affecting the proper functioning of the braking system. This jamming can reduce braking performance and even pose a safety hazard.

[0005] Therefore, there is an urgent need for a cable-type EPB mechanism that can facilitate and quickly replace the cable while preventing the screw and nut from getting stuck. This mechanism should adopt a connection method that is easy to disassemble and design an effective anti-jamming mechanism to improve the reliability and safety of the EPB. Summary of the Invention

[0006] The utility model aims to solve the shortcomings of the prior art and provides a cable-type electronic parking brake with an easily detachable cable.

[0007] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0008] A cable-type electronic parking brake with an easily removable cable comprises a cable assembly and a housing. The housing houses a drive unit. The output end of the drive unit is connected to a transmission gear pair, which is connected to the cable assembly via a screw. The transmission gear pair is limitedly mounted in the housing and sleeved around the screw. The transmission gear pair cooperates with the screw, and the drive unit drives the transmission gear pair to rotate, driving the screw in axial reciprocating motion. A connector is provided at the end of the cable assembly, which is removably connected to the connector. When the screw and cable assembly are assembled, the cable assembly moves axially synchronously with the screw. This easily removable cable-type electronic parking brake not only significantly reduces the vulnerability of cable components in EPB systems and the resulting high maintenance costs, but the connector can be removed from the screw, making repair and upgrade of old EPB assemblies more convenient and efficient. When the cable is damaged, only the worn cable assembly needs to be replaced, without having to replace or upgrade the entire EPB assembly, significantly saving repair costs and time. This design not only improves the economy and efficiency of maintenance, but also provides users with flexible maintenance solutions, extends the overall life of the EPB system, and embodies a sustainable maintenance strategy.

[0009] Preferably, the connector includes a screw connecting portion, and the screw is provided with a mounting end portion corresponding to one end of the cable assembly. The screw connecting portion cooperates with the mounting end portion to enable the screw and the cable assembly to be detachably connected.

[0010] Preferably, the screw connection portion is provided with a mounting hole, the side wall of the mounting hole is provided with an internal thread, and the outer wall of the mounting end is provided with an external thread, so that the mounting end extends into the mounting hole and mates with the thread of the mounting hole. The use of a threaded connection method can make the assembly process of the cable and screw more convenient, increase the installation speed of workers, and thus improve product production efficiency.

[0011] Preferably, the screw connecting portion and the screw are snap-connected.

[0012] Preferably, the system further includes a dust cover, one end of which is sleeved on the outer surface of the connector and the other end of which is connected to the housing. The dust cover is axially retractable along the direction of movement of the cable assembly. The retractable dust cover can move axially along with the screw and cable assembly, thereby protecting the space within the cable assembly from dust and water during operation.

[0013] Preferably, the connector also includes a riveted cable connection for secure connection to the cable assembly. The riveted cable connection and screw connection are located at the front and rear ends of the connector, respectively, with the screw connection having a larger diameter than the riveted cable connection. The cable assembly connector, with both riveted and screw connections, not only enables a removable and attachable connection between the cable and the MGU, but also simplifies its structure. The connector is already formed during cable processing, facilitating subsequent disassembly, assembly, and maintenance.

[0014] Preferably, a working groove for axial movement of the screw is provided in the box, and the working groove and the axis of the screw are located on the same straight line. The transmission gear pair includes a driving gear connected to the driving device and a driven gear matched with the screw. The driving gear and the driven gear are connected through an intermediate gear.

[0015] Preferably, the inner ring of the driven gear is fixedly installed or integrally formed with a nut nest, the internal thread of the nut nest cooperates with the external thread of the screw, the box body limits the axial position of the nut nest, and the transmission gear pair drives the nut nest to rotate.

[0016] Preferably, the intermediate gear has two tooth portions with different rotational radii, and the two tooth portions are respectively engaged with the driving gear and the driven gear to change the rotational torque of the driven gear.

[0017] Preferably, a limiting platform is provided at one end of the working groove of the screw, and the limiting platform protrudes radially outward relative to the external threaded portion of the screw, and a plane bearing is provided between the limiting platform and the nut nesting. Adding a plane bearing between the screw and the nut can effectively avoid jamming caused by contact between the screw and the nut plane under extreme displacement conditions. A limiting platform is provided at one end of the working groove of the screw, and a plane bearing is used to separate the limiting platform and the nut nesting, thereby achieving precise and smooth movement of the screw and the nut. Compared with the direct contact design in the prior art, when the EPB works to the maximum stroke, the radially outward protruding structure of the screw head and the nut nesting are effectively isolated by the limiting platform, thereby avoiding direct hard contact between the two and greatly reducing the risk of jamming. This optimized design not only improves the response speed of the braking system and reduces the heat generated by friction, thereby reducing wear and noise, but also better ensures the stability of the system during long-term operation and significantly increases the safety performance of the braking system.

[0018] Preferably, a step for axially limiting the plane bearing is provided in the box body, and the front and rear end faces of the plane bearing are respectively in contact with the step and the nut.

[0019] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0020] The use of a detachable cable assembly and screw allows for quick assembly of the MGU, making it easy to repair and replace. Only the cable assembly needs to be replaced, eliminating the need to replace the entire parking brake. This reduces repair costs and scrap rates.

[0021] The addition of a flat bearing structure improves the stability and reliability of the EPB product, prevents the screw from getting stuck when it reaches its limit position, and improves the safety of the parking brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of the cable-type EPB of the utility model;

[0023] Figure 2 A schematic structural diagram of the cable assembly of the utility model;

[0024] Figure 3 A schematic structural diagram of the screw rod of the utility model;

[0025] Figure 4 This utility model Figure 1 A partial enlarged view of middle A;

[0026] Figure 5 This utility model Figure 1 A partial enlarged view of B in the middle;

[0027] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. Cable assembly; 11. Connector; 111. Riveted wire drawing part; 112. Screw connecting part; 113. Mounting hole; 2. Box body; 21. Working groove; 22. Step; 3. Driving device; 4. Screw; 41. Mounting end; 42. Limiting platform; 5. Nut nesting; 6. Plane bearing; 71. Driving gear; 72. Driven gear; 73. Intermediate gear; 8. Dust cover. DETAILED DESCRIPTION

[0028] The present invention is described in further detail below with reference to the accompanying drawings and embodiments. Example

[0029] A cable-type electronic parking brake with an easily detachable cable, such as Figure 1 As shown, it includes a cable assembly 1 and a housing 2. A drive device 3 is installed in the housing 2. The output end of the drive device 3 is connected to a transmission gear pair. The transmission gear pair is connected to the cable assembly 1 through a screw 4. The transmission gear pair is limitedly installed in the housing 2 and is sleeved outside the screw 4. The transmission gear pair cooperates with the screw 4. The drive device 3 drives the transmission gear pair to rotate and drive the screw 4 to reciprocate axially. A connector 11 is provided at the end of the cable assembly 1. The end of the screw 4 is detachably connected to the connector 11. When the screw 4 and the cable assembly 1 are assembled, the cable assembly 1 moves axially synchronously with the screw 4. The drive device 3 is generally a motor, and the output end of the drive device 3 is the output shaft of the motor.

[0030] like Figure 2 As shown, the connector 11 includes a screw connecting portion 112, and the screw 4 is correspondingly provided with a mounting end portion 41 at one end located at the cable assembly 1. The screw connecting portion 112 cooperates with the mounting end portion 41 to make the screw 4 and the cable assembly 1 detachable.

[0031] In one embodiment, the screw connection portion 112 is provided with a mounting hole 113, the side wall of the mounting hole 113 is provided with an internal thread, and the outer wall of the mounting end portion 41 is provided with an external thread, and the mounting end portion 41 extends into the mounting hole 113 and cooperates with the thread of the mounting hole 113. Threaded connection is one of the cooperation methods. In fact, as another embodiment, the screw connection portion 112 and the screw rod 4 can also adopt a snap connection, or can also achieve a detachable connection through a slot, a bump connection, or other methods that are readily conceivable to those skilled in the art.

[0032] It also includes a dust cover 8, one end of which is sleeved on the outer surface of the connector 11, and the other end of the dust cover 8 is connected to the box body 2. The dust cover 8 can be axially extended and retracted along the movement direction of the cable assembly 1.

[0033] The connecting head 11 also includes a riveted wire pulling part 111 for fixedly connecting to the cable assembly 1. The riveted wire pulling part 111 and the screw connecting part 112 are respectively located at the front and rear ends of the connecting head 11. The diameter of the screw connecting part 112 is larger than that of the riveted wire pulling part 111.

[0034] A working groove 21 for axial movement of the screw 4 is provided in the box body 2. The working groove 21 and the axis of the screw 4 are located on the same straight line. The transmission gear pair includes a driving gear 71 connected to the driving device 3 and a driven gear 72 matched with the screw 4. The driving gear 71 and the driven gear 72 are connected through an intermediate gear 73.

[0035] The inner ring of the driven gear 72 is fixedly installed or integrally formed with a nut nest 5, the internal thread of the nut nest 5 cooperates with the external thread of the screw 4, the box body 2 limits the axial position of the nut nest 5, and the transmission gear pair drives the nut nest 5 to rotate.

[0036] The intermediate gear 73 has two teeth with different rotational radii. The two teeth are respectively engaged with the driving gear 71 and the driven gear 72 to change the rotational torque of the driven gear 72 .

[0037] like Figure 5 As shown, a limiting platform 42 is provided at one end of the working groove 21 of the screw 4 . The limiting platform 42 protrudes radially outward relative to the external thread portion of the screw 4 . A plane bearing 6 is provided between the limiting platform 42 and the nut nest 5 .

[0038] A step 22 for axially limiting the plane bearing 6 is provided in the box body 2 , and the front and rear end faces of the plane bearing 6 are in contact with the step 22 and the nut nest 5 respectively.

[0039] Brief description of working principle:

[0040] The screw's function is to convert the drive unit's rotation into axial forward and backward motion through the force of the gear pair, thereby driving the cable assembly. The cable assembly connects the EPB to the parking arm. When braking, the drive unit drives the internal transmission gear pair, rotating the nut nesting accordingly. The screw 4, which engages the nut nesting 5, is driven axially. The cable assembly connected to the screw moves axially in sync with the screw, pulling the connected parking arm backward, thereby achieving the braking state. When the cable assembly needs to be repaired or replaced, the cable assembly connector is separated from the screw. If the detachable connection between the two is a bolted connection, the connector, along with the cable assembly, is unscrewed from the end of the screw 4. Once the replacement is complete, the connector is screwed back onto the screw 4.

[0041] (1) Parking: When parking is performed, the drive unit 3 operates and rotates in the forward direction. The drive unit 3 inputs power to the driving gear 71, which drives the intermediate gear 73 to rotate, thereby driving the driven gear 72 to rotate, achieving a change in torque and increasing the moment. The rotation of the driven gear drives the nut nest 5 connected to it to rotate, and the rotation of the nut nest 5 drives the screw 4 that is threaded with it to move axially. The axial movement of the screw 4 drives the cable assembly 1 connected to it to move linearly, achieving the pull parking state.

[0042] (2) Release: Contrary to the above parking, the drive device 3 operates and rotates in the reverse direction, the transmission gear pair also rotates in the reverse direction, and the axial movement of the screw 4 drives the cable assembly 1 to return to its original position to realize the release process.

[0043] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] In short, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention patent.

Claims

1. A cable-type electronic parking brake with an easily detachable cable, comprising a cable assembly (1) and a housing (2), wherein a drive device (3) is installed in the housing (2), an output end of the drive device (3) is connected to a transmission gear pair, and the transmission gear pair is connected to the cable assembly (1) through a screw (4), characterized in that: The transmission gear pair is limitedly installed in the box body (2), and the transmission gear pair is sleeved outside the screw rod (4). The transmission gear pair cooperates with the screw rod (4), and the driving device (3) drives the transmission gear pair to rotate and drive the screw rod (4) to move axially back and forth; the end of the cable assembly (1) is provided with a connector (11), and the end of the screw rod (4) is detachably connected to the connector (11). When the screw rod (4) and the cable assembly (1) are assembled, the cable assembly (1) moves axially synchronously with the screw rod (4); The connector (11) includes a screw connecting portion (112), and the screw (4) is provided with a mounting end portion (41) at one end thereof located at the cable assembly (1), and the screw connecting portion (112) cooperates with the mounting end portion (41) to enable the screw (4) to be detachably connected to the cable assembly (1); The screw connecting portion (112) is snap-fitted to the screw (4); or the screw connecting portion (112) is provided with a mounting hole (113), a side wall of the mounting hole (113) is provided with an internal thread, an outer wall of the mounting end portion (41) is provided with an external thread, and the mounting end portion (41) extends into the mounting hole (113) and cooperates with the thread of the mounting hole (113).

2. The cable-type electronic parking brake with an easily detachable cable according to claim 1, characterized in that: It also includes a dust cover (8), one end of which is sleeved on the outer surface of the connector (11), and the other end of which is connected to the box body (2). The dust cover (8) can be axially extended and retracted along the movement direction of the cable assembly (1).

3. The cable-type electronic parking brake with an easily detachable cable according to claim 1, characterized in that: The connector (11) further comprises a riveted wire portion (111) for fixedly connecting to the cable assembly (1). The riveted wire portion (111) and the screw connection portion (112) are respectively located at the front and rear ends of the connector (11), and the diameter of the screw connection portion (112) is larger than that of the riveted wire portion (111).

4. The cable-type electronic parking brake with an easily detachable cable according to claim 1, characterized in that: A working groove (21) for axial movement of the screw (4) is provided in the housing (2), and the working groove (21) and the axis of the screw (4) are located on the same straight line. The transmission gear pair includes a driving gear (71) connected to the driving device (3) and a driven gear (72) matched with the screw (4). The driving gear (71) and the driven gear (72) are connected to each other through an intermediate gear (73).

5. The cable-type electronic parking brake with easily detachable cable according to claim 4, characterized in that: The inner ring of the driven gear (72) is fixedly mounted or integrally formed with a nut nest (5), the internal thread of the nut nest (5) cooperates with the external thread of the screw (4), the housing (2) limits the nut nest (5) in the axial direction, the transmission gear pair drives the nut nest (5) to rotate, and the intermediate gear (73) has two teeth with different rotational radii, the two teeth respectively meshing with the driving gear (71) and the driven gear (72), and is used to change the torque of the driven gear (72) rotation.

6. A cable-type electronic parking brake with an easily detachable cable according to any one of claims 1 to 5, characterized in that: The screw (4) is provided with a limiting platform (42) at one end of the working groove (21), the limiting platform (42) is provided with an external thread portion radially protruding outward relative to the screw (4), and a plane bearing (6) is provided between the limiting platform (42) and the nut nest (5).

7. The cable-type electronic parking brake with easily detachable cable according to claim 6, characterized in that: A step (22) for axially limiting the plane bearing (6) is provided in the box body (2), and the front and rear end faces of the plane bearing (6) are in contact with the step (22) and the nut nest (5) respectively.

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