Electric brake capable of reducing noise

Abstract

The utility model discloses an electric brake capable of reducing noise, which comprises a shell, a motor is fixed in the middle of the shell, an output shaft at one end of the motor is in transmission connection with a planetary speed reduction structure, the output end of the planetary speed reduction structure is connected with a secondary gear, and the secondary gear is meshed with a speed reduction transmission output gear; the output gear comprises a first output gear and a second output gear which are stacked, a brake output shaft is fixed to the first output gear, the first output gear and the second output gear are rotationally arranged on the output gear shaft, the first output gear is arranged on the output gear shaft in a radial sliding mode, and the second output gear is arranged on the second output gear shaft in a radial sliding mode. An elastic structure is arranged between the first output gear and the second output gear, the diameters of tooth root circles of the first output gear and the second output gear are the same, and the diameter of an addendum circle of the second output gear is slightly larger than that of an addendum circle of the first output gear. The utility model has the advantages of small brake impact and low noise.

Description

Technical Field

[0001] The utility model relates to an electric brake, in particular to an electric brake with small braking impact, small noise and capable of reducing noise. Background Art

[0002] Electric brake systems usually react faster than traditional hydraulic or pneumatic brake systems because electronic signals are transmitted extremely quickly with almost no delay. The electronic control system of the electric brake system allows for more precise distribution and management of braking force, so that the vehicle can achieve optimal braking performance under various driving conditions, which is particularly important for heavy vehicles and autonomous driving systems. The electric brake system can be closely integrated with other electronic systems (such as anti-lock brake system (ABS), electronic stability control system (ESC), etc.), thereby improving the overall safety and performance of the vehicle. The electric brake system eliminates the complex hydraulic circuits and mechanical components in the traditional brake system, which can reduce the total weight and maintenance requirements of the vehicle. However, because electrical energy is converted into kinetic energy without an intermediate medium, the power transmission is very direct and rapid, so when the vehicle is overspeeding or overloaded, the instantaneous inertial kinetic energy is too large, which can easily cause damage to the vehicle and cause harsh noise. Summary of the invention

[0003] The utility model aims to provide an electric brake with small braking impact, small noise and the ability to reduce noise.

[0004] The utility model is achieved through the following technical measures: an electric brake capable of reducing noise, comprising a shell, a motor fixed in the middle of the shell, an output shaft at one end of the motor transmission connected to a planetary reduction structure, an output end of the planetary reduction structure connected to a secondary gear, the secondary gear meshing reduction transmission output gear; the output gear is a stacked first output gear and a second output gear, a brake output shaft is fixed on the first output gear, the first output gear and the second output gear are rotatably arranged on the output gear shaft, the first output gear is radially slidably arranged on the output gear shaft, an elastic structure is arranged between the first output gear and the second output gear, the first output gear and the second output gear have the same diameter of the tooth heel circle, and the diameter of the tooth top circle of the second output gear is slightly larger than the diameter of the tooth top circle of the first output gear.

[0005] As a preferred embodiment, the output shaft of the motor is fixedly connected to the sun gear of the planetary reduction structure, the planet carrier of the planetary reduction structure is fixedly connected to the secondary gear, and the secondary gear meshes with the reduction transmission output gear.

[0006] As a preferred embodiment, a push rod support plate is provided on the housing, an output gear shaft extends from the push rod support plate, a bearing is provided on the output gear shaft, the second output gear is fixed on the outer ring of the bearing, and the first output gear is radially slidably provided on the outer ring of the bearing.

[0007] As a preferred embodiment, a thrust sensor is provided between the push rod support plate and the housing.

[0008] As a preferred embodiment, an electromagnetic brake fixed on the housing is provided at the other end of the motor.

[0009] As a preferred embodiment, the elastic structure is a compression spring, and the initial pressure of the compression spring is 80%-90% of the maximum braking force.

[0010] As a preferred embodiment, the initial pressure of the compression spring is 83% of the maximum braking force.

[0011] As a preferred embodiment, a cavity accommodating part of the elastic structure is provided between the first output gear and the second output gear.

[0012] As a preferred embodiment, the shell includes a middle shell, one end cover of the middle shell is provided with a reduction shell, the planetary reduction structure, the secondary gear and the output gear are arranged between the middle shell and the reduction shell, the other end cover of the middle shell is provided with a rear cover, and the motor is arranged between the middle shell and the rear cover.

[0013] As a preferred embodiment, a control board is further disposed in the shell, and a power line terminal and a signal line terminal electrically connected to the control board are disposed on the shell.

[0014] The utility model arranges the output gear as a stacked first output gear and a second output gear. When the vehicle brakes while driving at high speed, the secondary gear drives the first output gear and the second output gear to rotate. When the reaction force generated by the brake disc pressing on the brake pad is greater than the initial pressure of the elastic structure, the first output gear slides on the output gear shaft toward the second output gear, so that the instantaneous pressure of the brake disc pressing on the brake pad is buffered, which can reduce the impact caused by excessive instantaneous inertial kinetic energy, reduce damage to the vehicle while effectively braking, and effectively reduce braking noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic structural diagram of an electric brake capable of reducing noise according to an embodiment of the utility model.

[0016] Figure 2 The utility model is a schematic diagram of an exploded structure of an electric brake capable of reducing noise according to an embodiment of the utility model.

[0017] Figure 3This is another exploded structural schematic diagram of an electric brake capable of reducing noise according to an embodiment of the utility model.

[0018] Figure 4 This is a cross-sectional view of an electric brake capable of reducing noise according to an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] An electric brake capable of reducing noise, reference Figures 1 to 4 , including a shell, the shell including a middle shell 7, one end cover of the middle shell 7 is provided with a reduction shell 10, and the other end cover of the middle shell 7 is provided with a back cover 11, the stator winding assembly 5 of the motor is arranged in the middle shell 7, the stator winding assembly 5 is fixed on the middle shell 7 through the motor end cover 13, and a plurality of power connection plates 4 electrically connected to the winding are provided on the bobbin of the stator winding assembly 5, and the power connection plates 4 extend into the control board 2 and are directly connected thereto; the output shaft 3 of the motor rotor assembly 6 is transmission-connected to a planetary reduction structure, and the output end of the planetary reduction structure is connected to a secondary gear 17, and the secondary gear 17 meshes with the reduction transmission output gear 9; the output gear 9 is a stacked first output gear 901 and the second output gear 902, a brake output shaft (such as a screw rod, which drives the brake discs on both sides of the brake pad to be pressed flat on the brake pad through a nut-driven caliper structure) is fixed on the first output gear 901, the first output gear 901 and the second output gear 902 are rotatably arranged on the output gear shaft 20, the first output gear 901 is radially slidably arranged on the output gear shaft 20, an elastic structure 23 is arranged between the first output gear 901 and the second output gear 902, the diameters of the tooth heel circles of the first output gear 901 and the second output gear 902 are the same, and the diameter of the tooth top circle of the second output gear 902 is slightly larger than the diameter of the tooth top circle of the first output gear 901.

[0021] The electric brake of this embodiment which can reduce noise sets the output gear 9 as a stacked first output gear 901 and a second output gear 902, and the diameter of the tooth top circle of the second output gear 902 is slightly larger than the diameter of the tooth top circle of the first output gear 901, and an elastic structure 23 is arranged between the first output gear 901 and the second output gear 902. When the vehicle is running normally and needs to brake, the secondary gear 17 drives the first output gear 901 and the second output gear 902 to rotate. At this time, the reaction force generated by the brake disc pressing flat on the brake pad is smaller than the initial pressure of the elastic structure 23. At this time, the elastic structure 23 will not be compressed. When the vehicle is braking while driving at high speed, the secondary gear 17 drives the first output gear 901 and the second output gear 902 to rotate. When the reaction force generated by the brake disc pressing on the brake pad is greater than the initial pressure of the elastic structure 23, the first output gear 901 slides toward the second output gear 902 on the output gear shaft 20, so that the instantaneous pressure of the brake disc pressing on the brake pad is buffered, which can reduce the impact caused by excessive instantaneous inertial kinetic energy, and can reduce damage to the vehicle while effectively braking and effectively reduce braking noise. The electric brake of the utility model that can reduce noise, refer to Figures 1 to 4 On the basis of the previous technical solution, the output shaft 3 of the motor is fixedly connected to the sun gear 18 of the planetary reduction structure, the planet carrier 8 of the planetary reduction structure is fixedly connected to the secondary gear 17, and the secondary gear 17 meshes with the reduction transmission output gear 9.

[0022] The electric brake capable of reducing noise of the utility model, referring to Figures 1 to 4 , based on the previous technical solution, specifically, a push rod support plate 17 is provided on the housing, an output gear shaft 20 extends from the push rod support plate 19, a needle bearing 22 is provided on the output gear shaft 20, the second output gear 901 is fixed on the outer ring of the needle bearing 22, and the first output gear 901 is radially slidably provided on the outer ring of the needle bearing 22. In order to make the transition between the two smoother, the tooth top of the second output gear 901 is sloped, and the diameter of the tooth top circle at one end close to the first output gear 901 is the same as the diameter of the tooth top circle of the first output gear 901, and gradually increases.

[0023] The electric brake capable of reducing noise of the utility model, referring to Figures 1 to 4 On the basis of the above technical solution, a thrust sensor 21 is provided between the push rod support plate 19 and the middle shell 7 for detecting the reverse thrust during operation so as to stop the machine in time when an abnormality occurs.

[0024] The electric brake capable of reducing noise of the utility model, referring to Figures 1 to 4 On the basis of the above technical solution, specifically, an electromagnetic brake 1 fixed on the bottom cover 11 is provided at the other end of the motor to assist the motor in stopping quickly.

[0025] The electric brake capable of reducing noise of the utility model, referring to Figures 1 to 4 On the basis of the previous technical solution, the elastic structure 23 is a compression spring, and the initial pressure of the compression spring is 80%-90% of the maximum braking force. The utility model inventor found that the best effect is achieved when the initial pressure of the compression spring is 83% of the maximum braking force.

[0026] The electric brake capable of reducing noise of the utility model, referring to Figures 1 to 4 Specifically, on the basis of the previous technical solution, a cavity for accommodating part of the elastic structure is provided between the first output gear 901 and the second output gear 902, so as to avoid excessive deformation and failure of the elastic structure 23 when the reverse thrust is too large.

[0027] The electric brake capable of reducing noise of the utility model, referring to Figures 1 to 4 Specifically, on the basis of the previous technical solution, the middle shell 7 is provided with a power line terminal 13 and a signal line terminal 12 electrically connected to the control board 13.

[0028] The above is an explanation of the electric brake capable of reducing noise of the present invention, which is used to help understand the present invention. However, the implementation of the present invention is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. An electric brake capable of reducing noise, characterized in that: It comprises a shell, a motor is fixed in the middle of the shell, an output shaft at one end of the motor is transmission-connected to a planetary reduction structure, an output end of the planetary reduction structure is connected to a secondary gear, and the secondary gear meshes with the reduction transmission output gear; the output gear is a stacked first output gear and a second output gear, a brake output shaft is fixed on the first output gear, the first output gear and the second output gear are rotatably arranged on the output gear shaft, the first output gear is radially slidingly arranged on the output gear shaft, an elastic structure is arranged between the first output gear and the second output gear, the diameters of the first output gear and the second output gear tooth heel circles are the same, and the diameter of the second output gear tooth top circle is slightly larger than the diameter of the first output gear tooth top circle.

2. The electric brake capable of reducing noise according to claim 1, characterized in that: The output shaft of the motor is fixedly connected to the sun gear of the planetary reduction structure, the planet carrier of the planetary reduction structure is fixedly connected to the secondary gear, and the secondary gear is meshed with the reduction transmission output gear.

3. The electric brake capable of reducing noise according to claim 1, characterized in that: The housing is provided with a push rod support plate, an output gear shaft extends from the push rod support plate, a bearing is provided on the output gear shaft, the second output gear is fixed on the outer ring of the bearing, and the first output gear is radially slidably provided on the outer ring of the bearing.

4. The electric brake capable of reducing noise according to claim 3, characterized in that: A thrust sensor is arranged between the push rod supporting plate and the housing.

5. The electric brake capable of reducing noise according to claim 1, characterized in that: The other end of the motor is provided with an electromagnetic brake fixed on the housing.

6. The electric brake capable of reducing noise according to claim 1, characterized in that: The elastic structure is a compression spring, and the initial pressure of the compression spring is 80%-90% of the maximum braking force.

7. The electric brake capable of reducing noise according to claim 6, characterized in that: The initial pressure of the compression spring is 83% of the maximum braking force.

8. The electric brake capable of reducing noise according to claim 1, characterized in that: A cavity for accommodating a portion of the elastic structure is provided between the first output gear and the second output gear.

9. The electric brake capable of reducing noise according to claim 1, characterized in that: The shell comprises a middle shell, one end cover of the middle shell is provided with a reduction shell, the planetary reduction structure, the secondary gear and the output gear are arranged between the middle shell and the reduction shell, the other end cover of the middle shell is provided with a rear cover, and the motor is arranged between the middle shell and the rear cover.

10. The electric brake capable of reducing noise according to claim 1, characterized in that: The housing is provided with a power line terminal and a signal line terminal electrically connected to the control board.

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