Drum-type EPB actuator and drum-type brake assembly

Abstract

The utility model relates to a drum-type EPB actuator and a drum-type brake assembly, and the drum-type EPB actuator comprises a shell, a sealing sleeve and an inhaul cable; the inhaul cable comprises a first steel wire rope, a connecting part and a second steel wire rope which are sequentially connected, the connecting part comprises a connecting piece and a connecting cylinder, the end, facing the connecting piece, of the connecting cylinder is closed, one end of the first steel wire rope is connected into the shell, the other end of the first steel wire rope is connected with the connecting piece, and one end of the second steel wire rope is fixedly arranged in the connecting cylinder; one end of the sealing sleeve and the outer wall of the shell are sealed and fixed in the circumferential direction, and the other end of the sealing sleeve and the outer wall of the connecting cylinder are sealed and fixed in the circumferential direction. According to the scheme, the sealing performance of the drum-type EPB actuator can be effectively guaranteed, impurities or liquid is prevented from entering the drum-type EPB actuator, and it is guaranteed that the drum-type EPB actuator works stably.

Description

Technical Field

[0001] The present application relates to the technical field of drum brakes, and in particular to a drum EPB actuator and a drum brake assembly. Background Art

[0002] Intelligence is the development trend of the automotive industry. The electronic parking brake system is easy to operate, comfortable and safe, and has become an important market segment in the automotive industry. At present, the disc EPB market is very mature, but the domestic market for drum EPB is still in its infancy. At present, in the design of general drum EPB actuators, the sealing sleeve of the actuator only meets the dustproof requirements, and the waterproof requirements cannot be met. This is easy to cause poor sealing during use. Impurities and liquids enter the drum EPB actuator through the seal, causing the internal motor and other parts of the actuator to work poorly, or even functional damage.

[0003] Therefore, how to ensure the sealing performance of the drum-type EPB actuator, prevent impurities or liquids from entering the drum-type EPB actuator, and ensure the stable operation of the drum-type EPB actuator are technical problems that technical personnel in this field urgently need to solve. Utility Model Content

[0004] The purpose of the present application is to provide a drum EPB actuator and a drum brake assembly, which can effectively ensure the sealing performance of the drum EPB actuator, prevent impurities or liquids from entering the drum EPB actuator, and ensure the stable operation of the drum EPB actuator.

[0005] In order to solve the above technical problems, the present application provides a drum-type EPB actuator, including a shell, a sealing sleeve and a cable; the cable includes a first steel wire rope, a connecting part and a second steel wire rope connected in sequence, the connecting part includes a connecting piece and a connecting tube, the connecting tube is closed toward one end of the connecting piece, one end of the first steel wire rope is connected to the shell, the other end of the first steel wire rope is connected to the connecting piece, and one end of the second steel wire rope is fixed in the connecting tube; one end of the sealing sleeve is sealed and fixed to the outer wall of the shell along the circumferential direction, and the other end of the sealing sleeve is sealed and fixed to the outer wall of the connecting tube along the circumferential direction.

[0006] Since the steel wire rope includes multiple steel wire strands, and there are gaps between the steel wire strands, external liquid (such as water, etc.) can flow from the gaps in the steel wire rope to the shell. However, in the present application, since the connecting tube has only one end open, one end of the second steel wire rope is fixed in the inner cavity of the connecting tube by the opening. Therefore, when external water can flow along the gaps between the steel wire strands of the second steel wire rope to one side of the shell, this part of water will enter the connecting tube. Since the end of the connecting tube facing the connecting piece is in a closed state, it can prevent external water from entering along the gaps in the second steel wire rope, thereby ensuring waterproof performance.

[0007] One end of the sealing sleeve is sealed and fixed to the outer wall of the housing along the circumferential direction, and the other end of the sealing sleeve is sealed and fixed to the outer wall of the connecting tube along the circumferential direction. In this way, the sealing sleeve can ensure the sealing of the connection between the housing and the cable, ensuring the dustproof and waterproof effects there.

[0008] Therefore, the drum-type EPB actuator provided in the present application realizes the sealing of the connection between the shell and the cable from the outside through a sealing sleeve, and realizes the waterproof performance of the connection between the two through the connection between the connecting tube sealed at one end and the second steel wire rope, thereby effectively preventing external water from entering the shell. The overall structure is simple and the sealing is reliable.

[0009] In addition, the sealing sleeve is a flexible structure, and the first steel wire rope and the second steel wire rope are also flexible structures. Therefore, the drum-type EPB actuator provided in the present application is flexible in the part outside the shell, and can produce a certain degree of bending during use. In this way, the requirements for installation space and installation angle can be reduced, which is convenient for spatial arrangement. At the same time, it can also avoid the problem of interference between the cable and other surrounding components during movement.

[0010] Optionally, the outer wall of the connecting tube is circumferentially provided with a first annular groove, and the inner wall of the sealing sleeve is circumferentially provided with a first annular protrusion, or the outer wall of the connecting tube is circumferentially provided with a first annular protrusion, and the inner wall of the sealing sleeve is circumferentially provided with a first annular groove; the sealing sleeve is sleeved on the outside of the connecting tube, and the first annular protrusion is located in the first annular groove.

[0011] Optionally, the number of the first annular grooves is at least two, and the first annular grooves are arranged at intervals along the axial direction of the connecting tube.

[0012] Optionally, a second annular groove is circumferentially provided on the outer wall of the end of the shell, a second annular protrusion is circumferentially provided on the inner wall of the sealing sleeve, the sealing sleeve is sleeved outside the end of the shell, and the second annular protrusion is located in the second annular groove.

[0013] Optionally, a third annular groove is further provided on the inner wall of the sealing sleeve along the circumferential direction, and a third annular protrusion is further provided on the end of the shell, and the third annular protrusion is located in the third annular groove.

[0014] Optionally, the end of the connecting tube is riveted and fixed to the second steel wire rope.

[0015] Optionally, the connecting member is a tubular structure, one end of the first steel wire rope facing the second steel wire rope is located in the inner cavity of the connecting member, and the end of the connecting member is riveted and fixed to the first steel wire rope.

[0016] Optionally, the pull cable also includes a joint and a protective cover, the joint is connected to one end of the second steel wire rope away from the first steel wire rope, the protective cover is arranged outside the second steel wire rope, and one end of the protective cover abuts against the end face of the connecting tube, and the part of the second steel wire rope located between the protective cover and the joint forms a mating section, and the mating section is used to cooperate with the handbrake lever.

[0017] Optionally, it further includes a transmission part arranged in the housing, and one end of the first steel wire rope away from the second steel wire rope is transmission-connected to the transmission part.

[0018] The present application also provides a drum brake assembly, including a drum brake, a handbrake lever and the drum EPB actuator as described above, wherein the drum EPB actuator is fixed to the drum brake, and a cable of the drum EPB actuator is connected to the handbrake lever.

[0019] The technical effect of the drum brake assembly having the drum EPB actuator as described above is similar to the technical effect of the drum EPB actuator described above, and will not be described in detail here to save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a drum brake assembly provided in an embodiment of the present application;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-drum EPB actuator;

[0022] Figure 3 yes Figure 2 A partial cross-sectional view of

[0023] Figure 4 It is a structural diagram of the connection part of the drum type EPB actuator;

[0024] Figure 5 yes Figure 4 Middle AA section view.

[0025] Attached Figure 1-Figure 5 In the figure, the reference numerals are described as follows:

[0026] 10 drum EPB actuator; 20 drum brake; 30 handbrake lever; 40 support structure;

[0027] 1 housing, 11 second annular groove, 12 third annular protrusion;

[0028] 2 sealing sleeve, 21 first annular protrusion, 22 second annular protrusion, 23 third annular groove;

[0029] 3 cable, 31 first steel wire rope, 32 connecting portion, 321 connecting piece, 322 connecting tube, 323 first annular groove, 33 second steel wire rope, 34 joint, 35 protective sleeve, 36 matching section;

[0030] 4. Transmission unit;

[0031] 5. Drum brakes. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The present application embodiment provides a drum EPB actuator and a drum brake assembly, wherein: Figure 1 As shown, the drum brake assembly includes a drum brake 20, a drum EPB actuator 10 and a handbrake lever 30. The drum brake 20 uses a brake transmission mechanism to make the brake shoe press the brake friction plate against the inner side of the brake drum, thereby generating a braking force. EPB (Electrical Park Brake) controls the parking brake through an electronic circuit, and has the same function as a mechanical lever handbrake. When starting, the electronic handbrake does not need to be turned off manually, and the electronic handbrake will automatically turn off when the accelerator is pressed to start.

[0034] The drum EPB actuator 10 includes a housing 1, a driving part, a transmission part 4 and a cable 3. The housing 1 is fixed to the drum brake, and the driving part and the transmission part 4 are arranged in the housing 1. The driving part is connected to the cable 3 through the transmission part 4, and can pull the cable 3 to move. The cable 3 is connected to the hand brake lever 30. Under the driving action of the driving part, the transmission part 4 can drive the cable 3 to move, and then drive the hand brake lever 30 to move to achieve parking. Specifically, in this embodiment, there is no restriction on the specific structure of the driving part and the transmission part 4. The driving part can be a motor, and the transmission part 4 is a screw rod, and the end of the screw rod is connected to the cable 3.

[0035] like Figure 2 and Figure 3 As shown, the cable 3 includes a first steel wire rope 31, a connecting part 32 and a second steel wire rope 33 which are arranged in sequence, the connecting part 32 includes a connecting piece 321 and a connecting tube 322, wherein the connecting tube 322 is closed at one end facing the connecting piece 321, the end of the first steel wire rope 31 away from the second steel wire rope 33 extends into the shell 1 and is transmission-connected to the transmission part 4 in the shell 1, the other end of the first steel wire rope 31 is connected to the connecting piece 321, the end of the second steel wire rope 33 facing the first steel wire rope 31 is fixed in the connecting tube 322, and the end of the second steel wire rope 33 away from the first steel wire rope 31 is connected to the handbrake lever 30.

[0036] Since the steel wire rope includes multiple steel wires and there are gaps between the steel wires, external liquid (such as water, etc.) can flow toward the shell 1 through the gaps in the steel wire rope. However, in the present embodiment, since the connecting tube 322 has only one end open, one end of the second steel wire rope 33 is fixed in the inner cavity of the connecting tube 322 through the opening. Therefore, when external water can flow toward one side of the shell 1 along the gaps between the steel wires of the second steel wire rope 33, this part of water will enter the connecting tube 322. Since the end of the connecting tube 322 facing the connecting member 321 is in a closed state, it can prevent external water from entering along the gaps in the second steel wire rope 33, thereby ensuring waterproof performance.

[0037] The drum type EPB actuator 10 further includes a sealing sleeve 2, one end of which is sealed and fixed to the outer wall of the housing 1 along the circumferential direction, and the other end of the sealing sleeve 2 is sealed and fixed to the outer wall of the connecting tube 322 along the circumferential direction. In this way, the sealing sleeve 2 can ensure the sealing of the connection between the housing 1 and the cable 3, thereby ensuring the dustproof and waterproof effects there.

[0038] Therefore, the drum-type EPB actuator 10 provided in this embodiment realizes the sealing of the connection between the shell 1 and the cable 3 from the outside through the sealing sleeve 2, and realizes the waterproof performance of the connection between the two through the connection between the connecting tube 322 blocked at one end and the second steel wire rope 33, thereby effectively preventing external water from entering the shell 1. The overall structure is simple and the sealing is reliable.

[0039] In addition, the sealing sleeve 2 is a flexible structure, and the first steel wire rope 31 and the second steel wire rope 33 are also flexible structures. Therefore, the drum-type EPB actuator 10 provided in this embodiment is flexible in the part outside the shell 1, and can produce a certain degree of bending during use. In this way, the requirements for installation space and installation angle can be reduced, which is convenient for spatial arrangement. At the same time, it can also avoid the problem of interference between the cable 3 and other surrounding components during movement.

[0040] like Figure 3-Figure 5 As shown, the outer wall of the connecting tube 322 is circumferentially provided with a first annular groove 323, and the inner wall of the sealing sleeve 2 is circumferentially provided with a first annular protrusion 21. The sealing sleeve 2 is sleeved outside the connecting tube 322, and the two are interference fit, and the first annular protrusion 21 is located in the first annular groove 323 to ensure sealing, while also limiting the separation of the two in the axial direction to ensure stable installation.

[0041] like Figure 4 and Figure 5As shown, the outer wall of the connecting tube 322 is provided with two first annular grooves 323, and the two first annular grooves 323 are arranged in an axial direction at intervals. Correspondingly, the inner wall of the sealing sleeve 2 is provided with two first annular protrusions 21, and the two first annular protrusions 21 are also arranged in an axial direction at intervals. After the sealing sleeve 2 is sleeved on the outside of the connecting tube 322, the two first annular protrusions 21 are respectively and correspondingly located in the two first annular grooves 323, so that the sealing performance can be further ensured.

[0042] Of course, the number of the first annular grooves 323 can be three or more, and the number of the first annular protrusions 21 is the same as the number of the first annular grooves 323, and the positions correspond to each other. The provision of two first annular grooves 323 can simplify the overall structure and facilitate installation while ensuring sealing.

[0043] Alternatively, the outer wall of the connecting tube 322 may be provided with a first annular protrusion, and the inner wall of the sealing sleeve 2 may be provided with a first annular groove, and the connecting tube 322 and the sealing sleeve 2 may achieve limiting and sealing through the first annular protrusion and the first annular groove.

[0044] like Figure 3 As shown, the outer wall of the shell 1 is circumferentially provided with a second annular groove 11, and the inner wall of the side end of the sealing sleeve 2 away from the connecting tube 322 is circumferentially provided with a second annular protrusion 22, the sealing sleeve 2 is sleeved on the outside of the shell 1 and has an interference fit with the outer wall of the shell 1, and the second annular protrusion 22 is located in the second annular groove 11 to ensure the sealing performance, and at the same time, it also limits the separation of the two in the axial direction to ensure stable installation.

[0045] like Figure 3 As shown, the inner wall of the sealing sleeve 2 is also provided with a third annular groove 23 along the circumferential direction, and the outer wall of the shell 1 is also provided with a third annular protrusion 12 along the circumferential direction. The third annular protrusion 12 is located in the third annular groove 23, so that a labyrinth sealing structure can be formed with the above-mentioned second annular protrusion 22 and second annular groove 11, which can further ensure the sealing performance and limiting stability.

[0046] In this embodiment, the connecting tube 322 and the second steel wire rope 33 are fixed by riveting, and specifically, they can be fixed by four-way riveting or six-way riveting to achieve force transmission. With such a setting, the connection strength is high and the stability of force transmission can be guaranteed.

[0047] The connecting piece 321 is a tubular structure, which is closed at one end facing the connecting tube 322 , that is, the inner cavity of the connecting piece 321 and the inner cavity of the connecting tube 322 are not connected, ensuring that water entering the connecting tube 322 will not enter the connecting piece 321 .

[0048] Of course, in the present embodiment, there is no limitation on the specific structure of the connector 321. For example, it can also be configured to include at least two fixing claws spaced circumferentially along the first steel wire rope 31. The ends of the fixing claws can be bent and inserted into the first steel wire rope 31 to be fixed to the first steel wire rope 31. When the connector 321 is configured to be a tubular structure, the connector 321 and the first steel wire rope 31 can also be fixed by riveting. Specifically, they can be fixed and pressed by four-way riveting or hexagonal riveting to achieve force transmission. The fixing method is the same as the connection method between the connecting tube 322 and the second steel wire rope 33. While simplifying the connection operation process, it can also ensure the connection stability.

[0049] Furthermore, there is no limitation on the connection method between the first steel wire rope 31 and the transmission part 4, such as fixation by riveting or other methods in the prior art.

[0050] like Figure 3 As shown, the cable 3 also includes a joint 34 and a protective sleeve 35, wherein the joint 34 is connected to one end of the second steel wire rope 33 away from the first steel wire rope 31, the protective sleeve 35 is sleeved outside the second steel wire rope 33, and one end of the protective sleeve 35 abuts against the end surface of the connecting tube 322, and the other end of the protective sleeve 35 is arranged at intervals from the joint 34, and the part of the second steel wire rope 33 between the protective sleeve 35 and the joint 34 forms a matching section 36, which is used to match the handbrake lever 30. The handbrake lever 30 is provided with a U-shaped opening, and the matching section 36 can be inserted into the U-shaped opening from the opening of the U-shaped opening, and the axial movement between the cable 3 and the handbrake lever 30 is limited by the joint 34. When the driving part drives and drives the cable 3 to move through the transmission part 4, the cable 3 can drive the handbrake lever 30 to move through the joint 34, thereby achieving braking.

[0051] Specifically, there is no limitation on the connection method between the second steel wire rope 33 and the joint 34. For example, the joint 34 can be fixed to the end of the second steel wire rope 33 by riveting, such as the fixing method between the reference connecting tube 322 and the second steel wire rope 33. Alternatively, a connecting buckle can be provided at the end of the second steel wire rope away from the first steel wire rope 31, and the joint 34 can be fixed by the connecting buckle.

[0052] The provision of the protective cover 35 can provide protection for the second steel wire rope 33, prevent the second steel wire rope 33 from rubbing against other components (especially the support structure 40 for supporting the second steel wire rope 33) during movement and causing wear, thereby increasing the service life of the second steel wire rope 33. There is no limitation on the specific structure of the protective cover 35, and the protective cover 35 can be a sleeve sleeved outside the second steel wire rope 33, or a plastic layer formed outside the second steel wire rope 33.

[0053] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A drum type EPB actuator, characterized in that: It comprises a housing (1), a sealing sleeve (2) and a cable (3); The pull cable (3) comprises a first steel wire rope (31), a connecting portion (32) and a second steel wire rope (33) which are connected in sequence, the connecting portion (32) comprises a connecting piece (321) and a connecting tube (322), the connecting tube (322) is closed toward one end of the connecting piece (321), one end of the first steel wire rope (31) is connected to the housing (1), the other end of the first steel wire rope (31) is connected to the connecting piece (321), and one end of the second steel wire rope (33) is fixed in the connecting tube (322); One end of the sealing sleeve (2) is sealed and fixed to the outer wall of the housing (1) along the circumferential direction, and the other end of the sealing sleeve (2) is sealed and fixed to the outer wall of the connecting tube (322) along the circumferential direction.

2. The drum type EPB actuator according to claim 1, characterized in that: The outer wall of the connecting tube (322) is provided with a first annular groove (323) along the circumferential direction, and the inner wall of the sealing sleeve (2) is provided with a first annular protrusion (21) along the circumferential direction, or the outer wall of the connecting tube (322) is provided with a first annular protrusion (21) along the circumferential direction, and the inner wall of the sealing sleeve (2) is provided with a first annular groove (323) along the circumferential direction; The sealing sleeve (2) is sleeved on the outside of the connecting tube (322), and the first annular protrusion (21) is located in the first annular groove (323).

3. The drum type EPB actuator according to claim 2, characterized in that: The number of the first annular grooves (323) is at least two, and the first annular grooves (323) are arranged at intervals along the axial direction of the connecting tube (322).

4. The drum type EPB actuator according to any one of claims 1 to 3, characterized in that: The outer wall of the end of the housing (1) is provided with a second annular groove (11) along the circumferential direction, and the inner wall of the sealing sleeve (2) is provided with a second annular protrusion (22) along the circumferential direction; the sealing sleeve (2) is sleeved outside the end of the housing (1), and the second annular protrusion (22) is located in the second annular groove (11).

5. The drum type EPB actuator according to claim 4, characterized in that: The inner wall of the sealing sleeve (2) is also provided with a third annular groove (23) along the circumferential direction, and the end of the housing (1) is also provided with a third annular protrusion (12), wherein the third annular protrusion (12) is located in the third annular groove (23).

6. The drum type EPB actuator according to any one of claims 1 to 3, characterized in that: The end of the connecting tube (322) is riveted and fixed to the second steel wire rope (33).

7. The drum type EPB actuator according to any one of claims 1 to 3, characterized in that: The connecting piece (321) is a tubular structure, one end of the first steel wire rope (31) facing the second steel wire rope (33) is located in the inner cavity of the connecting piece (321), and the end of the connecting piece (321) is riveted and fixed to the first steel wire rope (31).

8. The drum type EPB actuator according to any one of claims 1 to 3, characterized in that: The pull cable (3) further comprises a joint (34) and a protective sleeve (35), wherein the joint (34) is connected to an end of the second steel wire rope (33) away from the first steel wire rope (31), the protective sleeve (35) is sleeved outside the second steel wire rope (33), and one end of the protective sleeve (35) abuts against an end surface of the connecting tube (322), and the part of the second steel wire rope (33) located between the protective sleeve (35) and the joint (34) forms a mating section (36), and the mating section (36) is used to cooperate with the hand brake lever (30).

9. The drum type EPB actuator according to any one of claims 1 to 3, characterized in that: It also comprises a transmission part (4) arranged in the housing (1), and one end of the first steel wire rope (31) away from the second steel wire rope (33) is in transmission connection with the transmission part (4).

10. A drum brake assembly, characterized in that: It comprises a drum brake (20), a handbrake lever (30), and a drum EPB actuator according to any one of claims 1 to 9, wherein the drum EPB actuator is fixed to the drum brake (20), and a cable (3) of the drum EPB actuator is connected to the handbrake lever (30).

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