Linear brake actuator

Abstract

The utility model discloses a linear brake actuator which comprises a shell and a transmission gear rotationally installed on the shell, and an electromagnet is embedded in the transmission gear. A transmission nut with the end extending out of the shell is installed on the transmission gear in a sliding mode, a transmission connecting part is arranged at the extending end of the transmission nut, a thrust rod extending in the axis direction of the transmission nut is arranged on the transmission nut, a magnetic suction cup is meshed with the transmission nut, a first friction plate is arranged on the magnetic suction cup, and a second friction plate corresponding to the first friction plate is arranged on the transmission gear. The thrust rod is sleeved with a return spring connected between the shell and the transmission nut in an abutting mode. A speed reduction tooth set in transmission connection with the transmission gear is installed in the shell, and a motor connected with the speed reduction tooth set is installed on the shell. Under the condition that the electromagnet and the motor are powered off, the return spring drives the magnetic suction cup to reset, so that the first friction plate and the second friction plate are separated, and contact braking power is transmitted outwards; under the condition, the condition that the motor is damaged or generates heat due to continuous connection can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of brake devices, in particular to a linear brake actuator. Background Art

[0002] The vehicle braking system has an active braking structure, which realizes deceleration and braking power input during active braking through motor-controlled linear braking structure. It generally includes a motor, a transmission nut and a driving gear. After the motor rotates the driving gear, the transmission nut realizes power output and is connected with the power part of the vehicle to realize directional deceleration and braking. Since the transmission nut rotates synchronously with the driving gear on the same axis, in the event of motor failure or power failure, the motor may be in a braking position, causing the linear brake actuator to be unable to reset. If it cannot be reset, the contact part will be in a braking state all the time, which may easily cause motor damage or heat generation. Utility Model Content

[0003] 1. Technical issues

[0004] The utility model aims to provide a linear brake actuator to solve the problem in the prior art that the motor-driven linear brake actuator cannot be actively reset in the event of power failure.

[0005] (II) Technical solution

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A linear brake actuator comprises a housing and a transmission gear rotatably mounted on the housing, wherein the transmission gear is embedded with an electromagnet; a transmission nut with an end extending out of the housing is slidably mounted on the transmission gear, wherein the end extending out of the transmission nut is provided with a transmission connection portion, wherein the transmission nut is provided with a thrust rod extending along its axial direction, wherein the transmission nut is meshed with a magnetic suction cup, wherein the magnetic suction cup is provided with a first friction plate, and wherein the transmission gear is provided with a second friction plate corresponding to the first friction plate; wherein the thrust rod is sleeved with a return spring abutting between the housing and the transmission nut; wherein a reduction gear group transmission-connected to the transmission gear is mounted in the housing, and wherein a motor connected to the reduction gear group is mounted on the housing.

[0008] Preferably, the reduction gear group includes a first large gear and a first small gear fixed coaxially, the first small gear is meshed with the transmission gear, a second small gear is installed on the output shaft of the motor, and the second small gear is meshed with the first large gear; the first large gear and the first small gear are rotatably installed in the housing.

[0009] Preferably, the transmission connection portion is a tooth structure.

[0010] Preferably, the thrust rod is provided with a threaded structure which is tightly matched with the transmission nut.

[0011] Preferably, a U-shaped connecting block is fixed to the end of the thrust rod extending out of the transmission nut, and a through connecting hole is formed on the U-shaped connecting block.

[0012] Preferably, the housing is provided with a sliding cylinder extending outward, and the return spring is arranged in the sliding cylinder.

[0013] (III) Beneficial effects

[0014] The transmission nut is separated from the transmission gear, and the transmission gear is driven to rotate under the cooperation of the motor and the reduction gear set. When the braking power needs to be transmitted, the magnetic suction cup is attracted to the electromagnet, so that the first friction plate on the magnetic suction cup is combined with the second friction plate on the transmission gear to rotate the transmission nut and the thrust rod, and the braking power is transmitted to the outside through the transmission connection part;

[0015] When the electromagnet and the motor lose power, the return spring returns the magnetic suction cup to its original position, allowing the first friction plate and the second friction plate to separate, and the contact braking force is transmitted outward; in this case, damage to the motor or heating caused by continuous connection can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 It is a cross-sectional structural schematic diagram of an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of an embodiment of the utility model without the housing;

[0019] exist Figures 1 to 3 In the figure, the corresponding relationship between the component names or lines and the figure numbers is as follows:

[0020] Housing 1, transmission gear 2, electromagnet 3, transmission nut 4, transmission connecting part 5, thrust rod 6, magnetic suction cup 7, first friction plate 8, second friction plate 9, return spring 10, reduction gear set 11, motor 12, first large gear 13, first small gear 14, second small gear 15, U-shaped connecting block 16, connecting hole 17, sliding cylinder 18. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] See also Figure 1-Figure 3 As shown, in the embodiment of the utility model, a linear brake actuator is proposed, which is applied to the braking system of the vehicle and plays an active braking role. Specifically, it comprises a housing 1 and a transmission gear 2 rotatably mounted on the housing 1, an electromagnet 3 is embedded in the transmission gear 2, and a transmission nut 4 with an end extending out of the housing 1 is slidably mounted on the transmission gear 2, and a transmission connection part 5 is provided at the end extending out of the housing 1, and the transmission connection part 5 is used to connect to the braking part of the power system, and a thrust rod 6 extending along the axial direction thereof is provided on the transmission nut 4, a magnetic suction cup 7 is meshed on the transmission nut 4, and a first friction plate 8 is provided on the magnetic suction cup 7, and a second friction plate 9 corresponding to the first friction plate 8 is provided on the transmission gear 2, and a return spring 10 is sleeved on the thrust rod 6 and abutted between the housing 1 and the transmission nut 4, and the return spring 10 is used to pull the magnetic suction cup 7 to reset, and actively separate the first friction plate 8 from the second friction plate 9 after the magnetic suction force of the electromagnet 3 disappears.

[0023] Meanwhile, a reduction gear set 11 drivingly connected to the transmission gear 2 is installed in the housing 1 , and a motor 12 connected to the reduction gear set 11 is installed on the housing 1 .

[0024] When active braking is required, the power is transmitted to the transmission gear 2 through the motor 12 and the reduction gear set 11 to rotate, and the magnetic suction disc 7 moves toward the transmission gear 2 under the magnetic attraction of the electromagnet 3, so that the first friction plate 8 and the second friction plate 9 are in contact, so that the transmission nut 4 can rotate synchronously, and the transmission nut 4 is connected to the external braking structure to transmit the braking force through the transmission connection part 5 of the transmission nut 4 to achieve the braking force input, such as the reverse speed and reverse force relative to the power system. After the electromagnet 3 is powered off, it is reset under the force of the return spring 10 to separate the first friction plate 8 from the second friction plate 9.

[0025] Specifically, the reduction gear group 11 includes a first large gear 13 and a first small gear 14 fixed coaxially, the first small gear 14 is meshed with the transmission gear 2, and a second small gear 15 is installed on the output shaft of the motor 12, the second small gear 15 is meshed with the first large gear 13, and the first large gear 13 and the first small gear 14 are rotatably installed in the housing 1. After the power of the motor 12 is transmitted through the second small gear 15, the power is transmitted to the transmission gear 2 through the first large gear 13 and the second small gear 15, thereby realizing a larger torque transmission.

[0026] Specifically, the transmission connection part 5 is a tooth structure, which is connected to the external power part through the tooth structure to ensure the transmission of the braking force.

[0027] At the same time, the thrust rod 6 is provided with a thread structure that is tightly matched with the drive nut 4, and the drive nut 4 and the thrust rod 6 are fixedly connected through the thread structure.

[0028] Specifically, a U-shaped connecting block 16 is fixed to the end of the thrust rod 6 extending out of the transmission nut 4, and a through connecting hole 17 is opened on the U-shaped connecting block 16. The external traction structure is connected through the U-shaped connecting block 16 and the connecting hole 17. If the power is lost, the first friction plate 8 and the second friction plate 9 can be pulled to achieve contact.

[0029] Specifically, a sliding cylinder 18 extending outward is provided on the housing 1, and the return spring 10 is arranged in the sliding cylinder 18. The sliding cylinder 18 is integrally formed with the housing 1 for placing the return spring 10 and having a space for the thrust rod 6 to slide.

[0030] The magnetic chuck 7 is made of magnetic material, such as neodymium iron boron.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A linear brake actuator, characterized in that: It comprises a housing and a transmission gear rotatably mounted on the housing, wherein an electromagnet is embedded in the transmission gear; A transmission nut with an end extending out of the housing is slidably mounted on the transmission gear, and a transmission connection portion is provided at the end extending out of the transmission nut; The transmission nut is provided with a thrust rod extending along the axial direction thereof, the transmission nut is meshed with a magnetic suction cup, the magnetic suction cup is provided with a first friction plate, and the transmission gear is provided with a second friction plate corresponding to the first friction plate; The thrust rod is sleeved with a return spring abutting between the housing and the transmission nut; A reduction gear set drivingly connected to the transmission gear is installed in the shell, and a motor connected to the reduction gear set is installed on the shell.

2. A linear brake actuator according to claim 1, characterized in that: The reduction gear set comprises a first large gear and a first small gear fixed coaxially, the first small gear meshes with the transmission gear, a second small gear is mounted on the output shaft of the motor, and the second small gear meshes with the first large gear; The first large gear and the first small gear are rotatably mounted in the housing.

3. A linear brake actuator according to claim 2, characterized in that: The transmission connection part is a tooth structure.

4. A linear brake actuator according to claim 3, characterized in that: The thrust rod is provided with a thread structure which is tightly matched with the transmission nut.

5. A linear brake actuator according to claim 4, characterized in that: A U-shaped connecting block is fixed to the end of the thrust rod extending out of the transmission nut, and a through connecting hole is provided on the U-shaped connecting block.

6. A linear brake actuator according to any one of claims 1 to 5, characterized in that: The housing is provided with a sliding cylinder extending outward, and the return spring is arranged in the sliding cylinder.

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